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WO2013012064A1 - Feedback circuit and power adjusting device - Google Patents

Feedback circuit and power adjusting device Download PDF

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Publication number
WO2013012064A1
WO2013012064A1 PCT/JP2012/068464 JP2012068464W WO2013012064A1 WO 2013012064 A1 WO2013012064 A1 WO 2013012064A1 JP 2012068464 W JP2012068464 W JP 2012068464W WO 2013012064 A1 WO2013012064 A1 WO 2013012064A1
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WO
WIPO (PCT)
Prior art keywords
power
circuit
value
upper limit
charging
Prior art date
Application number
PCT/JP2012/068464
Other languages
French (fr)
Japanese (ja)
Inventor
一男 石本
中島　武
中井　智通
博志 佐伯
Original Assignee
三洋電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Publication of WO2013012064A1 publication Critical patent/WO2013012064A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a feedback circuit used in a power adjustment device and a power adjustment device using the feedback circuit.
  • Patent Document 1 discloses a solar battery, a plurality of secondary batteries charged by the solar battery, and a secondary battery connected between each secondary battery and the solar battery.
  • a solar battery power supply device comprising: a charge switch for controlling charging of a secondary battery; a discharge switch connected between each secondary battery and a load; and a control circuit for controlling the charge switch and the discharge switch. It is disclosed.
  • the control circuit specifies the priority order of the secondary batteries to be charged by controlling a plurality of charge switches, charges the secondary battery with a higher priority before the secondary battery with a lower priority, It is disclosed that when a secondary battery having a higher rank is charged with a predetermined capacity, a secondary battery having a lower priority is charged.
  • the upper limit power value of charge power and the upper limit power value of discharge power for the secondary battery are different. Therefore, when the charge power path and the discharge power path are simply made a common transmission path, the lower power limit of the charge power and the discharge power is set as the upper limit power value of the charge power and the power upper limit value of the discharge power. Will be. For this reason, there is a possibility that the power upper limit value with the higher charge power and discharge power cannot be utilized to the maximum extent.
  • the charging power path and the discharging power path for the secondary battery are divided into separate paths, it is possible to set an upper limit power value for each. However, as the number of paths increases, the configuration of peripheral circuits and the like becomes complicated. May also lead to an increase in cost.
  • An object of the present invention is to provide a feedback circuit that makes it possible to share a transmission path for charging power and discharging power for a secondary battery while making maximum use of the capacity of the secondary battery, and power adjustment using the feedback circuit Is to provide a device.
  • the feedback circuit according to the present invention includes a charging power when charging power is transmitted to a common power transmission path through which charging power from the charging device to the secondary battery and discharging power from the secondary battery to the load device is transmitted.
  • a limiting circuit is provided that limits the charging power value with the upper limit value and limits the discharging power value with the discharging power upper limit value when the discharging power is transmitted to the common power transmission path.
  • a power adjustment device includes the feedback circuit and a setting circuit that sets a charging power upper limit value and a discharging power upper limit value, respectively.
  • charging power and discharging power can be limited by different power upper limit values in a common transmission path of charging power and discharging power. Thereby, it is possible to share the transmission path for the charging power and the discharging power for the secondary battery while making maximum use of the respective power upper limit values for the charging power and the discharging power.
  • FIG. 5 is a flowchart illustrating an operation procedure of a control unit in the embodiment according to the present invention.
  • 6 is a flowchart showing an operation procedure of the setting circuit in the embodiment according to the invention.
  • it is a figure which shows the bidirectionality of a switch circuit.
  • it is a figure which shows the modification of an electrical storage system.
  • it is a figure which shows the structure of the feedback circuit of the modification of an electrical storage system.
  • FIG. 1 is a diagram showing a power storage system 10 including a power adjustment device 30.
  • the power storage system 10 includes a charging device 20, a control device 25, a power storage device 28 including a power adjustment device 30, and a load device 40.
  • the power storage system 10 adjusts the power value supplied from the charging device 20 to the load device 40.
  • the power adjustment device 30 sets the charging power value P 1 flowing through the power transmission path 1, the charging power upper limit value P lim1 of the discharging power value P 2 , and the discharging power upper limit value P lim2. Will be described later.
  • the power transmission path 1 is a path for supplying charging power from the charging device 20 to the secondary battery 39 of the power storage device 28, and is also a path for supplying discharging power from the secondary battery 39 to the load device 40. That is, the power transmission path 1 is a common transmission path for transmitting charging power and discharging power.
  • the power transmission path 1 connects the terminal 5 of the power storage device 28 and the terminal 7 of the power storage device 28.
  • the power transmission path 2 is a path for supplying power from the solar cell module 11 of the charging device 20 to the power storage device 28 and the load device 40 side.
  • the power transmission path 2 connects the path switching circuit 13 of the charging device 20 and the connection point 6.
  • the power transmission path 3 is a path for supplying power from the system power source 14 of the charging device 20 to the power storage device 28 and the load device 40 side.
  • the power transmission path 3 connects the AC / DC conversion circuit 16 of the charging device 20 and the connection point 6.
  • the power transmission path 4 is a path for supplying power from the charging device 20 and the power storage device 28 to the load device 40.
  • the power transmission path 4 connects the load 44 and the connection point 6 via the switch circuit 42.
  • the charging device 20 includes a solar cell module 11, a series / parallel switching circuit 12, a path switching circuit 13, a system power source 14, a DC / AC conversion circuit 15, an AC / DC conversion circuit 16, and a switch circuit 17.
  • the switch circuit 18 is provided.
  • the charging device 20 supplies power from the solar cell module 11 and the system power source 14 to the power storage device 28 and the load device 40 side.
  • the solar cell module 11 is a power device that converts incident sunlight into electric power.
  • the solar cell module 11 includes two photoelectric conversion units 111 and 112 that convert sunlight into DC power.
  • the serial / parallel switching circuit 12 is a circuit that switches the connection relationship between the two photoelectric conversion units 111 and 112 to serial connection or parallel connection.
  • the path switching circuit 13 is a circuit for switching whether the DC power of the solar cell module 11 is supplied to the power storage device 28 and the load device 40 side or supplied to the system power source 14 side.
  • the grid power source 14 is a power facility for supplying power using a commercial distribution line network owned by a power company or the like.
  • the DC / AC conversion circuit 15 is a power conversion circuit disposed between the path switching circuit 13 and the system power source 14.
  • the DC / AC conversion circuit 15 can convert the direct current power of the solar cell module 11 into alternating current power and make it flow backward to the system power source 14.
  • the AC / DC conversion circuit 16 is a power conversion circuit disposed between the switch circuit 18 and the system power source 14.
  • the AC / DC conversion circuit 16 can convert AC power supplied from the system power source 14 into DC power and supply it to the power storage device 28 and the load device 40 side.
  • the switch circuit 17 is a circuit that cuts off or connects the power transmission path 2 under the control of the control device 25.
  • the switch circuit 18 is a circuit that cuts off or connects the power transmission path 3 under the control of the control device 25.
  • the load device 40 includes a switch circuit 42 and a load 44.
  • the switch circuit 42 is a circuit that cuts off or connects the power transmission path 4 under the control of the control device 25.
  • the load 44 is a lighting device or the like that operates with DC power.
  • the control device 25 controls the operation of each element constituting the power storage system 10.
  • the control device 25 outputs a switching signal for switching the photoelectric conversion units 111 and 112 to either serial connection or parallel connection to the series-parallel switching circuit 12 based on setting information from the outside. Further, the control device 25 switches a switching signal for switching the output of the series / parallel switching circuit 12 to be supplied to either the DC / AC conversion circuit 15 or the switch circuit 17 based on setting information from the outside. Is output to the path switching circuit 13.
  • control device 25 performs switching control of the switch circuits 17, 18, and 42 based on setting information from the outside. For example, when the control device 25 supplies power from the solar cell module 11 to the power storage device 28 and the load device 40 side, the switch circuit 17 and the switch circuit 42 are turned on, and the switch circuit 18 is turned off. Output a control signal. For example, when the power from the grid power source 14 is supplied to the power storage device 28 and the load device 40 side, the control device 25 turns on the switch circuit 18 and the switch circuit 42 and turns off the switch circuit 17. In addition, a control signal is output. The control device 25 controls the function of the power adjustment device 30 according to the state of the charging device 20 and the state of the load device 40.
  • the power storage device 28 includes a power adjustment device 30 and a secondary battery 39.
  • the secondary battery 39 is a storage battery that is charged by the charging power from the solar cell module 11 or the system power source 14. Then, the discharged power discharged from the secondary battery 39 is supplied to the load 44 of the load device 40.
  • the power adjustment device 30 includes a feedback circuit 31 and a setting circuit 32.
  • the setting circuit 32 will be described.
  • the feedback circuit 31 includes a power sensor 33 for charging power and discharging power for the secondary battery 39, a limiting circuit 34, and a switch circuit 35.
  • the feedback circuit 31 has a charging power value P 1 indicating the charging power value of the secondary battery 39 and a discharging power value P 2 indicating the discharging power value corresponding to the charging power upper limit value P lim1 and discharging power, respectively. Feedback control is performed so as not to exceed the power upper limit value Plim2 .
  • FIG. 2 is a diagram showing the configuration of the feedback circuit 31. As shown in FIG. 1
  • Power sensor 33 includes a secondary battery 39, a switch circuit 35 is placed between the amplifier circuit 342 of the limiting circuit 34, to constantly detect the charging power value P 1 and the charging power value P 2 in the power transmission path 1 It is a detection unit. Further, the power value detected by the power sensor 33 is supplied to the amplifier circuit 342 of the limit circuit 34.
  • the switch circuit 35 is a circuit that cuts off or connects the power transmission path 1. That is, the power transmission path 1 is connected when the switch circuit 35 is on, and the power transmission path 1 is cut off when the switch circuit 35 is off. A specific configuration and the like of the switch circuit 35 will be described later.
  • the limiting circuit 34 includes an amplification circuit 342, an A / D conversion circuit 344, a control unit 346, and a level shift circuit 348.
  • the amplification circuit 342 is a circuit disposed between the power sensor 33 and the A / D conversion circuit 344.
  • the amplifier circuit 342 amplifies the power value detected by the power sensor 33 and supplies the amplified power value to the A / D conversion circuit 344.
  • the A / D conversion circuit 344 is a circuit disposed between the amplification circuit 342 and the control unit 346.
  • the A / D conversion circuit 344 converts the power value amplified by the amplification circuit 342 from an analog value to a digital value and supplies the converted value to the control unit 346.
  • the number of bits of the A / D conversion circuit 344 is, for example, 12 bits, and the resolution is higher than that of an A / D conversion circuit 363 described later, and more accurate A / D conversion can be performed.
  • the level shift circuit 348 is a circuit disposed between the control unit 346 and the switch circuit 35.
  • the level shift circuit 348 converts the level of the output signal supplied from the control unit 346 and supplies it to the switch circuit 35 as a control signal for turning on or off the switch circuit 35.
  • the control unit 346 uses the output of the A / D conversion circuit 344 and the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 input from the setting circuit 32 as input signals. Then, the control unit 346 outputs a signal that is a source of the control signal of the switch circuit 35 to the level shift circuit 348.
  • the control unit 346 uses a feedback path connecting the power sensor 33, the amplifier circuit 342, the A / D conversion circuit 344, the control unit 346, the level shift circuit 348, and the switch circuit 35, and uses the charging power value P 1 and the discharging power value P.
  • a control circuit 2 performs switching control of the switch circuit 35 so as not to exceed the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 set by the setting circuit 32.
  • the control unit 346 can be configured using a CPU, for example, but may be configured using other circuits. For example, a combination circuit can be used.
  • FIG. 3 is a flowchart showing an operation procedure of the control unit 346.
  • Control unit 346 based on the detection signal obtained from the power sensor 33, power value flowing through the power transmission path 1, it is determined whether the charging power value P 1 (S2).
  • the control unit 346 outputs a signal for turning on the switch circuit 35 before performing the process of S2.
  • the power sensor 33 is set so that the direction in which the charging power flows is a positive value, the discharging power flowing in the opposite direction to the charging power is detected as a negative value, and thus the charging power value P 1 And the discharge power value P 2 can be distinguished.
  • the charging power upper limit value P lim1> determines whether the charging power value P 1 (S4 ).
  • step S4 If it is determined in step S4 that the charging power upper limit value P lim1 > the charging power value P 1 , a signal for always turning on the switch circuit 35 is output (S8).
  • step S4 If it is determined in step S4 that the charging power upper limit value P lim1 > charging power value P 1 is not satisfied, a signal for repeatedly turning on or off the switch circuit 35 with a duty ratio of P lim1 / P 1. Is output (S10).
  • step S6 If it is determined in step S6 that the discharge power upper limit value P lim2 > discharge power value P 2 , the process proceeds to step S8.
  • step S6 If it is determined in step S6 that the discharge power upper limit value P lim2 > discharge power value P 2 is not satisfied, a signal for repeatedly turning on or off the switch circuit 35 with a duty ratio of P lim2 / P 2 is generated. Output (S12).
  • the process returns to S2 via the return process.
  • the control unit 346 can determine whether the power value flowing through the power transmission path 1 is the charging power value P 1 or the discharging power value P 2 . Then, until it is determined power value flowing through the power transmission path 1 is the charging power value P 1, when the charging power value P 1 exceeds the charging power upper limit value P lim1 is a charging power upper limit value P lim1 By performing feedback control that appropriately changes the duty ratio, the charging power value P 1 is limited to be equal to or less than the charging power upper limit value P lim1 .
  • the discharge power value P 2 is limited to be equal to or less than the discharge power upper limit value P lim2 .
  • the charging power upper limit value P lim1 and discharging power upper limit value P lim2 been changed by the setting circuit 32 executes the above steps by the power upper limit value P lim1, P lim2 after the change.
  • the setting circuit 32 sets the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 so as not to exceed the capacity of the secondary battery 39.
  • the setting circuit 32 obtains SOC (State of Charge) indicating the storage state of the secondary battery 39, the temperature of the secondary battery 39, the degree of deterioration of the secondary battery 39, and the like.
  • SOC State of Charge
  • the setting circuit 32 changes the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 for the secondary battery 39 based on the SOC or the like acquired from the secondary battery 39.
  • the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 set by the setting circuit 32 are transmitted to the control unit 346 of the limiting circuit 34.
  • FIG. 4 is a flowchart showing an operation procedure of the setting circuit 32.
  • the setting circuit 32 initializes the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 so as to satisfy the relationship of P lim2 > P lim1 (S20).
  • step S22 it is determined whether or not the SOC of the secondary battery 39 is greater than a predetermined reference value A (S22).
  • the reference value A is set based on the overcharge limit of the secondary battery 39 and the like. If it is determined in step S22 that the SOC of the secondary battery 39 is not greater than the reference value A, the process proceeds to step S24.
  • step S22 if it is determined that the SOC of the secondary battery 39 is larger than the reference value A, the charging power upper limit P lim1 is reduced to prevent overcharging, and the discharging power upper limit value is set. P lim2 is increased (S26). After step S26, the process returns to step S22 via return processing. By the process of S26, the secondary battery 39 can be prevented from being overcharged.
  • step S24 it is determined whether or not the SOC of the secondary battery 39 is smaller than the reference value B (S24).
  • the reference value B is determined based on the overdischarge limit of the secondary battery 39 and the like. If it is determined in step S24 that the SOC of the secondary battery 39 is not smaller than the reference value B, the process returns to step S22 via return processing.
  • step S24 if it is determined that the SOC of the secondary battery 39 is smaller than the reference value B, the charging power upper limit value is satisfied while satisfying the relationship P lim2 > P lim1 in order to prevent overdischarge. P lim1 is increased and the discharge power upper limit P lim2 is decreased (S28). After step S28, the process returns to step S22 via return processing. By the process of S28, the secondary battery 39 can be prevented from being overdischarged.
  • the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 can be set to different values, and the charging power depends on the SOC value of the secondary battery 39.
  • the upper limit value P lim1 and the discharge power upper limit value P lim2 can be changed.
  • the switch circuit 35 connects the power sensor 33 and the terminal 7, and cuts off or connects the power transmission path 1. That is, the power transmission path 1 is connected when the switch circuit 35 is on, and the power transmission path 1 is cut off when the switch circuit 35 is off.
  • FIG. 5 is a diagram showing the bidirectionality of the switch circuit 35.
  • the switch circuit 35 includes a transistor 351, a switch unit 352, a power source 353, a transistor 354, a switch unit 355, and a power source 356.
  • the transistor 351 is provided in series with the transistor 354 between the power sensor 33 and the terminal 7.
  • the transistor 351 is an n-channel transistor configured using a power MOSFET.
  • the cathode terminal of the body diode 351a of the transistor 351 is connected to the cathode terminal of the body diode 354a of the transistor 354.
  • the switch unit 352 is disposed between the power source 353 and the transistor 351.
  • the switch unit 352 is controlled to be turned on or off by a control signal from the level shift circuit 348. When the switch unit 352 is turned on, the power value of the power source 353 is applied between the gate and the source of the transistor 351.
  • transistor 354, the switch unit 355, and the power source 356 have the same configurations as the transistor 351, the switch unit 352, and the power source 353, respectively, and thus detailed description thereof is omitted.
  • the switch unit 352 and the switch unit 355 are turned on and off by an on / off control signal from the level shift circuit 348.
  • the transistor 354 when charging power flows from the charging device 20 to the secondary battery 39, the transistor 354 is turned off and the transistor 351 is turned on. As a result, charging power flows through the body diode 354a of the transistor 354 and the drain-source of the transistor 351.
  • the transistor 351 when discharge power flows from the secondary battery 39 to the load 44, the transistor 351 is turned off and the transistor 354 is controlled to turn on. As a result, discharge power flows through the body diode 351a of the transistor 351 and the drain-source of the transistor 354.
  • the switch circuit 35 power flows in both directions.
  • the switch unit 352 and the switch unit 355 are turned off. Accordingly, the output power of the power source 353 and the power source 356 is not applied between the gate and the source of the transistor 351 and the transistor 354, respectively, and thus the transistor 351 and the transistor 354 are turned off. That is, when the switch circuit 35 is turned off, the common power transmission path 1 through which the discharge power and the charge power for the secondary battery 39 flow is cut off.
  • the upper limit power value of the charge power and the upper limit power value of the discharge power for the secondary battery 39 are different from each other.
  • the charging power path and the discharging power path for the secondary battery 39 are divided into separate paths, and the upper limit power value of the charging power and the upper limit power value of the discharging power are set. If the number of routes increases, the configuration of peripheral circuits may become complicated, and it may lead to an increase in cost.
  • the conventional technology has such a configuration as follows. There is a reason.
  • the lower power of the charge power and the discharge power is set as the power upper limit value of the power storage system 10. This is because there is a possibility that the power upper limit value with the higher charge power and discharge power cannot be utilized to the maximum extent.
  • charging power and discharging power are transmitted to the common power transmission path 1, and the charging power upper limit is set for each of the charging power value P 1 and the discharging power value P 2.
  • the value P lim1 and the discharge power upper limit value P lim2 can be set to different values. Then, as described in the explanation of the operation of the control unit 346 using FIG. 3, when the power value flowing through the power transmission path 1 is determined to be the charging power value P 1 , the charging power value P 1 is used for charging. It limits so that electric power upper limit Plim1 may not be exceeded.
  • the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 can be set to different values, and the charging power value P 1 and the discharging power value P 2 are respectively set to the charging power upper limit values P lim1 , Switching control of the switch circuit 35 is performed so as not to exceed the discharge power upper limit P lim2 .
  • the number of paths can be reduced, and the configuration of peripheral circuits can be simplified.
  • FIG. 6 is a diagram illustrating the power storage system 10a. Since the difference between the power storage system 10a and the power storage system 10 is the limiting circuit 36, the following description will be focused on the limiting circuit 36.
  • FIG. 7 is a diagram showing a configuration of the limiting circuit 36.
  • the limiting circuit 36 includes an amplifier circuit 361, a low-pass filter 362, an A / D conversion circuit 363, a comparison circuit 364, a D / A conversion circuit 365, a control unit 366, and a level shift circuit 367.
  • the amplifier circuit 361 and the level shift circuit 367 are the same as the amplifier circuit 342 and the level shift circuit 348 of the power storage system 10, and thus detailed description thereof is omitted.
  • the low pass filter 362 is disposed between the amplification circuit 361 and the A / D conversion circuit 363.
  • the low-pass filter 362 passes (filters) a low-frequency band component of the analog value, which is the power value amplified by the amplifier circuit 361, and supplies it to the A / D conversion circuit 363.
  • the A / D conversion circuit 363 is disposed between the low-pass filter 362 and the control unit 366.
  • the A / D conversion circuit 363 converts the power value filtered by the low-pass filter 362 from an analog value to a digital value and supplies the converted value to the control unit 366.
  • the A / D conversion circuit 363 has 10 bits, the resolution is lower than that of the A / D conversion circuit 344 described above. For this reason, since the A / D conversion accuracy is somewhat inferior, the power value after conversion becomes a coarser value than the power value after conversion by the A / D conversion circuit 344. In other words, the power value output from the A / D conversion circuit 363 is a smooth power value.
  • the A / D conversion circuit 363 is inexpensive because it has a lower resolution than the A / D conversion circuit 344, and thus has a cost advantage.
  • the D / A conversion circuit 365 is disposed between the control unit 366 and the comparison circuit 364.
  • the reference power value output from the control unit 366 is converted from a digital value to an analog value and supplied to the comparison circuit 364.
  • the comparison circuit 364 compares the power value input from the amplification circuit 361 with the reference power value input from the D / A conversion circuit 365. Specifically, the comparison circuit 364 outputs High when the power value input from the amplifier circuit 361 exceeds the reference power value input from the D / A conversion circuit 365, and the power value is the reference power. When it does not exceed the value, Low is output.
  • the control unit 366 receives the output of the A / D conversion circuit 363, the output of the comparison circuit 364, the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 input from the setting circuit 32 as input signals. To do. Then, the control unit 366 outputs a signal that is a source of the control signal of the switch circuit 35 to the level shift circuit 367.
  • the control unit 366 uses a feedback path connecting the power sensor 33, the amplifier circuit 361, the low-pass filter 362, the A / D conversion circuit 363, the control unit 366, the level shift circuit 367, and the switch circuit 35, and uses the charging power value P 1 and The control circuit performs switching control of the switch circuit 35 so that the discharge power value P 2 does not exceed the charge power upper limit value P lim1 and the discharge power upper limit value P lim2 set by the setting circuit 32.
  • the value output from the A / D conversion circuit 363 is a smooth power value as described above, but is similar to the control unit 346 in that the control unit 366 performs feedback control based on the power value. Detailed description of the specific control will be omitted.
  • the control unit 366 outputs a stop signal for forcibly turning off the switch circuit 35 while the output of the comparison circuit 364 is High.
  • the control unit 366 outputs a reference power value to be supplied to the D / A conversion circuit 365.
  • the reference power value is such that the charging power value P 1 and the discharging power value P 2 for the secondary battery 39 change sharply and exceed the charging power upper limit value P lim1 and the discharging power upper limit value P lim2.
  • the power value is obtained in advance in order to detect a steep power change that cannot be detected by the A / D conversion circuit 363.
  • the charging power value P 1 is the charging power. It limits so that upper limit Plim1 may not be exceeded. Also, when the power value through the power transmission path 1 is determined to discharge power value P 2 is discharge power value P 2 is limited so as not to exceed the discharge power limit value P lim2. Thereby, like the power storage system 10, the number of paths can be reduced, and the configuration of peripheral circuits and the like can be simplified.
  • the power storage system 10a similarly to the power storage system 10, if it is determined that the SOC of the secondary battery 39 is larger than the reference value A by the operation of the setting circuit 32, in order to prevent overcharging.
  • the charging power upper limit value P lim1 is decreased, and the discharging power upper limit value P lim2 is increased. If it is determined that the SOC of the secondary battery 39 is smaller than the reference value B, the charging power upper limit value P lim1 is increased and the discharging power upper limit value P lim2 is set to prevent overdischarge. Make it smaller.
  • the burden on the secondary battery 39 is reduced, so that deterioration of the characteristics of the secondary battery 39 can be prevented.
  • the charging power value P 1 and the discharging power value P 2 for the secondary battery 39 are obtained using the smooth power value converted by the A / D conversion circuit 363, which is cheaper than the A / D conversion circuit 344.
  • Switching control of the switch circuit 35 is performed so as not to exceed the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 . If the charging power value P 1 and the discharging power value P 2 for the secondary battery 39 change sharply and exceed the charging power upper limit value P lim1 and discharging power upper limit value P lim2 , in other words, For example, it is assumed that there is a steep power change that cannot be detected by the A / D conversion circuit 363.
  • the comparison circuit 364 that compares the power values detects that the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 have been exceeded. As a result, the comparison circuit 364 changes to High, the switch circuit 35 is forcibly turned off, and charging / discharging of the secondary battery 39 is stopped, so that the burden on the secondary battery 39 can be reduced. . Thus, it is possible to compensate for the inferior accuracy of the A / D conversion circuit 363 compared to the A / D conversion circuit 344. Therefore, in the power storage system 10a, it is possible to prevent the deterioration of the characteristics of the secondary battery 39 while securing the cost advantage.
  • the switch circuit 35 is described as being controlled by using a set of circuits including the D / A conversion circuit 365 and the comparison circuit 364. However, a plurality of sets of circuits are prepared and different threshold values are set. It may be detected.
  • the setting circuit 32 has been described as changing the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 based on the SOC acquired from the secondary battery 39.
  • it may be changed using other information.
  • the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 may be changed according to the deterioration state of the secondary battery 39.
  • the temperature of the secondary battery 39 is low, it is difficult to charge compared to a high state.
  • the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 may be changed according to the temperature of the secondary battery 39.
  • preliminary charging may be necessary. In this case, it is necessary to lower the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 .
  • the setting circuit 32 can change the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 based on the time zone of the facility where the power storage systems 10 and 10a are installed. .
  • the charging power upper limit P lim1 is set large so that the generated power can be charged to the maximum.
  • the charging power upper limit value P lim1 is set so as to lower the charging current value P 1 .
  • the characteristic deterioration of the secondary battery 39 can be suppressed, so that charging power is small.
  • the setting of the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 has been described as being performed by the setting circuit 32, but the setting is performed by the control unit 346 of the limiting circuit 34. Alternatively, it may be set in the control device 25.
  • the adjustment target by the power adjustment device 30 has been described as being electric power, but it may be current or voltage.
  • the load supplied with power from the charging device 20 and the power storage device 28 has been described as one of the loads 44. Of course, more loads may be connected. . Further, the type of load may be either a DC load or an AC load.

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Abstract

A feedback circuit (31) is provided with a limiting circuit (36) that limits: a charging power value (P1) with a charging power upper limit value (Plim1) when charging power from a charging device (20) to a secondary battery (39) is transmitted through a common power transmission path (1) through which the charging power and discharging power from the secondary battery (39) to a load (40) are transmitted; and a discharging power value (P2) with a discharging power upper limit value (Plim2) when the discharging power is transmitted through the common power transmission path.

Description

フィードバック回路及び電力調整装置Feedback circuit and power adjustment device
　本発明は、電力調整装置に用いられるフィードバック回路及びそれを用いる電力調整装置に関する。 The present invention relates to a feedback circuit used in a power adjustment device and a power adjustment device using the feedback circuit.
　近年、二次電池を利用することで、エネルギの有効活用を行うことが考えられている。例えば、環境に優しいクリーンエネルギとして太陽電池モジュールの開発が盛んに行なわれているが、太陽光を電力に変換する太陽電池モジュールは蓄電機能を備えていないため、二次電池と組み合わせて使用されることがある。 In recent years, it has been considered to make effective use of energy by using secondary batteries. For example, solar cell modules have been actively developed as environmentally friendly clean energy, but solar cell modules that convert sunlight into electric power do not have a power storage function and are therefore used in combination with secondary batteries. Sometimes.
　本発明に関連する技術として、例えば、特許文献１には、太陽電池と、この太陽電池で充電される複数の二次電池と、各々の二次電池と太陽電池との間に接続されて二次電池の充電を制御する充電スイッチと、各々の二次電池と負荷との間に接続してなる放電スイッチと、充電スイッチと放電スイッチとを制御する制御回路とを備える太陽電池の電源装置が開示されている。ここでは、制御回路が、複数の充電スイッチを制御して充電する二次電池の優先順位を特定し、優先順位の高い二次電池を優先順位の低い二次電池よりも先に充電し、優先順位の高い二次電池が所定容量充電されると、優先順位の低い二次電池を充電するようにしてなることが開示されている。 As a technique related to the present invention, for example, Patent Document 1 discloses a solar battery, a plurality of secondary batteries charged by the solar battery, and a secondary battery connected between each secondary battery and the solar battery. A solar battery power supply device comprising: a charge switch for controlling charging of a secondary battery; a discharge switch connected between each secondary battery and a load; and a control circuit for controlling the charge switch and the discharge switch. It is disclosed. Here, the control circuit specifies the priority order of the secondary batteries to be charged by controlling a plurality of charge switches, charges the secondary battery with a higher priority before the secondary battery with a lower priority, It is disclosed that when a secondary battery having a higher rank is charged with a predetermined capacity, a secondary battery having a lower priority is charged.
特開２００３－１１１３０１号公報JP 2003-111301 A
　ところで、一般的に、二次電池に対する充電電力の上限電力値及び放電電力の上限電力値は異なる。そこで、充電電力経路と放電電力経路を単純に共通の伝送経路にした場合には、充電電力と放電電力の低い方の電力上限値を充電電力の上限電力値及び放電電力の電力上限値と設定することとなる。このため、充電電力と放電電力の高い方の電力上限値を最大限に活用することができない可能性がある。これに対し、二次電池に対する充電電力経路と放電電力経路とを別々の経路に分ければ、それぞれに上限電力値の設定が可能であるが、経路数が増えると周辺回路の構成等が複雑になる可能性もあり、また、コスト増大にも繋がる可能性もある。 By the way, in general, the upper limit power value of charge power and the upper limit power value of discharge power for the secondary battery are different. Therefore, when the charge power path and the discharge power path are simply made a common transmission path, the lower power limit of the charge power and the discharge power is set as the upper limit power value of the charge power and the power upper limit value of the discharge power. Will be. For this reason, there is a possibility that the power upper limit value with the higher charge power and discharge power cannot be utilized to the maximum extent. On the other hand, if the charging power path and the discharging power path for the secondary battery are divided into separate paths, it is possible to set an upper limit power value for each. However, as the number of paths increases, the configuration of peripheral circuits and the like becomes complicated. May also lead to an increase in cost.
　本発明の目的は、二次電池の能力を最大限に活用しつつ、二次電池に対する充電電力及び放電電力の伝送経路を共通とすることを可能とするフィードバック回路、及び、これを用いる電力調整装置を提供することである。 An object of the present invention is to provide a feedback circuit that makes it possible to share a transmission path for charging power and discharging power for a secondary battery while making maximum use of the capacity of the secondary battery, and power adjustment using the feedback circuit Is to provide a device.
　本発明に係るフィードバック回路は、充電装置から二次電池への充電電力及び二次電池から負荷装置への放電電力が伝送される共通の電力伝送経路に充電電力が伝送されるときは充電用電力上限値で充電電力値を制限し、共通の電力伝送経路に放電電力が伝送されるときは放電用電力上限値で放電電力値を制限する制限回路を備える。 The feedback circuit according to the present invention includes a charging power when charging power is transmitted to a common power transmission path through which charging power from the charging device to the secondary battery and discharging power from the secondary battery to the load device is transmitted. A limiting circuit is provided that limits the charging power value with the upper limit value and limits the discharging power value with the discharging power upper limit value when the discharging power is transmitted to the common power transmission path.
　また、本発明に係る電力調整装置は、上記フィードバック回路と、充電用電力上限値及び放電用電力上限値をそれぞれ設定する設定回路と、を備える。 Also, a power adjustment device according to the present invention includes the feedback circuit and a setting circuit that sets a charging power upper limit value and a discharging power upper limit value, respectively.
　本発明によれば、充電電力及び放電電力の共通の伝送経路において、充電電力及び放電電力についてそれぞれ異なる電力上限値で制限することができる。これにより、充電電力及び放電電力についてのそれぞれの電力上限値を最大限に活用しつつ、二次電池に対する充電電力及び放電電力の伝送経路を共通とすることができる。 According to the present invention, charging power and discharging power can be limited by different power upper limit values in a common transmission path of charging power and discharging power. Thereby, it is possible to share the transmission path for the charging power and the discharging power for the secondary battery while making maximum use of the respective power upper limit values for the charging power and the discharging power.
本発明に係る実施の形態において、電力調整装置の蓄電システムを示す図である。In embodiment which concerns on this invention, it is a figure which shows the electrical storage system of an electric power adjustment apparatus. 本発明に係る実施の形態において、フィードバック回路の構成を示す図である。In an embodiment concerning the present invention, it is a figure showing composition of a feedback circuit. 本発明に係る実施の形態において、制御部の動作手順を示すフローチャートである。5 is a flowchart illustrating an operation procedure of a control unit in the embodiment according to the present invention. 本発明に係る実施の形態において、設定回路の動作手順を示すフローチャートである。6 is a flowchart showing an operation procedure of the setting circuit in the embodiment according to the invention. 本発明に係る実施の形態において、スイッチ回路の双方向性を示す図である。In embodiment which concerns on this invention, it is a figure which shows the bidirectionality of a switch circuit. 本発明に係る実施の形態において、蓄電システムの変形例を示す図である。In embodiment which concerns on this invention, it is a figure which shows the modification of an electrical storage system. 本発明に係る実施の形態において、蓄電システムの変形例のフィードバック回路の構成を示す図である。In embodiment which concerns on this invention, it is a figure which shows the structure of the feedback circuit of the modification of an electrical storage system.
　以下に図面を用いて、本発明に係る実施の形態を詳細に説明する。また、以下では、全ての図面において、同様の要素には同一の符号を付し、重複する説明を省略する。また、本文中の説明においては、必要に応じそれ以前に述べた符号を用いるものとする。 Embodiments according to the present invention will be described below in detail with reference to the drawings. Also, in the following, in all the drawings, the same symbols are attached to the same elements, and the duplicate description is omitted. In the description in the text, the symbols described before are used as necessary.
　図１は、電力調整装置３０を含む蓄電システム１０を示す図である。蓄電システム１０は、充電装置２０と、制御装置２５と、電力調整装置３０を含む蓄電装置２８と、負荷装置４０とを備える。蓄電システム１０は、充電装置２０から負荷装置４０に供給される電力値を調整する。なお、電力調整装置３０は、電力伝送経路１を流れる充電電力値Ｐ1、放電電力値Ｐ2の充電用電力上限値Ｐlim1，放電用電力上限値Ｐlim2を設定するが、詳細な説明については後述する。 FIG. 1 is a diagram showing a power storage system 10 including a power adjustment device 30. The power storage system 10 includes a charging device 20, a control device 25, a power storage device 28 including a power adjustment device 30, and a load device 40. The power storage system 10 adjusts the power value supplied from the charging device 20 to the load device 40. The power adjustment device 30 sets the charging power value P 1 flowing through the power transmission path 1, the charging power upper limit value P lim1 of the discharging power value P 2 , and the discharging power upper limit value P lim2. Will be described later.
　最初に、蓄電システム１０の各電力伝送経路について説明する。 First, each power transmission path of the power storage system 10 will be described.
　電力伝送経路１は、充電装置２０から蓄電装置２８の二次電池３９に充電電力を供給するための経路であり、二次電池３９から負荷装置４０に放電電力を供給するための経路でもある。すなわち、電力伝送経路１は、充電電力及び放電電力を伝送する共通の伝送経路である。電力伝送経路１は、蓄電装置２８の端子５と、蓄電装置２８の端子７とを接続する。 The power transmission path 1 is a path for supplying charging power from the charging device 20 to the secondary battery 39 of the power storage device 28, and is also a path for supplying discharging power from the secondary battery 39 to the load device 40. That is, the power transmission path 1 is a common transmission path for transmitting charging power and discharging power. The power transmission path 1 connects the terminal 5 of the power storage device 28 and the terminal 7 of the power storage device 28.
　電力伝送経路２は、充電装置２０の太陽電池モジュール１１から蓄電装置２８及び負荷装置４０側に電力を供給するための経路である。電力伝送経路２は、充電装置２０の経路切替回路１３と、接続点６とを接続する。 The power transmission path 2 is a path for supplying power from the solar cell module 11 of the charging device 20 to the power storage device 28 and the load device 40 side. The power transmission path 2 connects the path switching circuit 13 of the charging device 20 and the connection point 6.
　電力伝送経路３は、充電装置２０の系統電力源１４から蓄電装置２８及び負荷装置４０側へ電力を供給するための経路である。電力伝送経路３は、充電装置２０のＡＣ／ＤＣ変換回路１６と、接続点６とを接続する。 The power transmission path 3 is a path for supplying power from the system power source 14 of the charging device 20 to the power storage device 28 and the load device 40 side. The power transmission path 3 connects the AC / DC conversion circuit 16 of the charging device 20 and the connection point 6.
　電力伝送経路４は、充電装置２０及び蓄電装置２８から負荷装置４０への電力を供給するための経路である。電力伝送経路４は、スイッチ回路４２を介して負荷４４と接続点６とを接続する。 The power transmission path 4 is a path for supplying power from the charging device 20 and the power storage device 28 to the load device 40. The power transmission path 4 connects the load 44 and the connection point 6 via the switch circuit 42.
　続いて、蓄電システム１０の各構成について説明する。充電装置２０は、太陽電池モジュール１１と、直並列切替回路１２と、経路切替回路１３と、系統電力源１４と、ＤＣ／ＡＣ変換回路１５と、ＡＣ／ＤＣ変換回路１６と、スイッチ回路１７と、スイッチ回路１８とを備える。充電装置２０は、太陽電池モジュール１１、系統電力源１４の電力を蓄電装置２８及び負荷装置４０側に供給する。 Subsequently, each configuration of the power storage system 10 will be described. The charging device 20 includes a solar cell module 11, a series / parallel switching circuit 12, a path switching circuit 13, a system power source 14, a DC / AC conversion circuit 15, an AC / DC conversion circuit 16, and a switch circuit 17. The switch circuit 18 is provided. The charging device 20 supplies power from the solar cell module 11 and the system power source 14 to the power storage device 28 and the load device 40 side.
　太陽電池モジュール１１は、入射された太陽光を電力に変換する電力機器である。太陽電池モジュール１１は、太陽光を直流電力に変換する２つの光電変換部１１１，１１２を含む。 The solar cell module 11 is a power device that converts incident sunlight into electric power. The solar cell module 11 includes two photoelectric conversion units 111 and 112 that convert sunlight into DC power.
　直並列切替回路１２は、２つの光電変換部１１１，１１２についての接続関係を直列接続または並列接続に切り替える回路である。 The serial / parallel switching circuit 12 is a circuit that switches the connection relationship between the two photoelectric conversion units 111 and 112 to serial connection or parallel connection.
　経路切替回路１３は、太陽電池モジュール１１の直流電力を蓄電装置２８及び負荷装置４０側へ供給するか、系統電力源１４側へ供給するか、を切り替える回路である。 The path switching circuit 13 is a circuit for switching whether the DC power of the solar cell module 11 is supplied to the power storage device 28 and the load device 40 side or supplied to the system power source 14 side.
　系統電力源１４は、電力会社等が保有する商用の配電線網を用いて電力を供給するための電力設備である。 The grid power source 14 is a power facility for supplying power using a commercial distribution line network owned by a power company or the like.
　ＤＣ／ＡＣ変換回路１５は、経路切替回路１３と系統電力源１４との間に配置される電力変換回路である。ＤＣ／ＡＣ変換回路１５によって、太陽電池モジュール１１の直流電力を交流電力に変換して系統電力源１４に逆潮流させることができる。 The DC / AC conversion circuit 15 is a power conversion circuit disposed between the path switching circuit 13 and the system power source 14. The DC / AC conversion circuit 15 can convert the direct current power of the solar cell module 11 into alternating current power and make it flow backward to the system power source 14.
　ＡＣ／ＤＣ変換回路１６は、スイッチ回路１８と系統電力源１４との間に配置される電力変換回路である。ＡＣ／ＤＣ変換回路１６によって、系統電力源１４から供給された交流電力を直流電力に変換し、蓄電装置２８及び負荷装置４０側に供給することができる。 The AC / DC conversion circuit 16 is a power conversion circuit disposed between the switch circuit 18 and the system power source 14. The AC / DC conversion circuit 16 can convert AC power supplied from the system power source 14 into DC power and supply it to the power storage device 28 and the load device 40 side.
　スイッチ回路１７は、制御装置２５の制御によって電力伝送経路２を遮断または接続する回路である。スイッチ回路１８は、制御装置２５の制御によって電力伝送経路３を遮断または接続する回路である。 The switch circuit 17 is a circuit that cuts off or connects the power transmission path 2 under the control of the control device 25. The switch circuit 18 is a circuit that cuts off or connects the power transmission path 3 under the control of the control device 25.
　負荷装置４０は、スイッチ回路４２と、負荷４４とを備える。スイッチ回路４２は、制御装置２５の制御によって電力伝送経路４を遮断または接続する回路である。負荷４４は、直流電力で動作する照明機器等である。 The load device 40 includes a switch circuit 42 and a load 44. The switch circuit 42 is a circuit that cuts off or connects the power transmission path 4 under the control of the control device 25. The load 44 is a lighting device or the like that operates with DC power.
　制御装置２５は、蓄電システム１０を構成する各要素の動作を制御する。制御装置２５は、外部からの設定情報等に基づいて、光電変換部１１１，１１２について、直列接続または並列接続のいずれかに切り替えるための切替信号を、直並列切替回路１２に出力する。また、制御装置２５は、外部からの設定情報等に基づいて、直並列切替回路１２の出力をＤＣ／ＡＣ変換回路１５またはスイッチ回路１７のいずれか一方に供給されるように切り替えるための切替信号を、経路切替回路１３に出力する。 The control device 25 controls the operation of each element constituting the power storage system 10. The control device 25 outputs a switching signal for switching the photoelectric conversion units 111 and 112 to either serial connection or parallel connection to the series-parallel switching circuit 12 based on setting information from the outside. Further, the control device 25 switches a switching signal for switching the output of the series / parallel switching circuit 12 to be supplied to either the DC / AC conversion circuit 15 or the switch circuit 17 based on setting information from the outside. Is output to the path switching circuit 13.
　また、制御装置２５は、外部からの設定情報等に基づいて、スイッチ回路１７，１８，４２のスイッチング制御を行う。例えば、制御装置２５は、太陽電池モジュール１１からの電力を蓄電装置２８及び負荷装置４０側に供給させる場合には、スイッチ回路１７、スイッチ回路４２をオンし、スイッチ回路１８をオフするように、制御信号を出力する。また、制御装置２５は、例えば、系統電力源１４からの電力を蓄電装置２８及び負荷装置４０側に供給させる場合には、スイッチ回路１８、スイッチ回路４２をオンし、スイッチ回路１７をオフするように、制御信号を出力する。また、制御装置２５は、充電装置２０の状態及び負荷装置４０の状態に応じて電力調整装置３０の機能を制御する。 Further, the control device 25 performs switching control of the switch circuits 17, 18, and 42 based on setting information from the outside. For example, when the control device 25 supplies power from the solar cell module 11 to the power storage device 28 and the load device 40 side, the switch circuit 17 and the switch circuit 42 are turned on, and the switch circuit 18 is turned off. Output a control signal. For example, when the power from the grid power source 14 is supplied to the power storage device 28 and the load device 40 side, the control device 25 turns on the switch circuit 18 and the switch circuit 42 and turns off the switch circuit 17. In addition, a control signal is output. The control device 25 controls the function of the power adjustment device 30 according to the state of the charging device 20 and the state of the load device 40.
　蓄電装置２８は、電力調整装置３０と二次電池３９とを備える。ここで、二次電池３９は、太陽電池モジュール１１または系統電力源１４からの充電電力によって充電される蓄電池である。そして、二次電池３９から放電された放電電力は、負荷装置４０の負荷４４に供給される。 The power storage device 28 includes a power adjustment device 30 and a secondary battery 39. Here, the secondary battery 39 is a storage battery that is charged by the charging power from the solar cell module 11 or the system power source 14. Then, the discharged power discharged from the secondary battery 39 is supplied to the load 44 of the load device 40.
　電力調整装置３０は、フィードバック回路３１と、設定回路３２とを備える。ここでは、まずフィードバック回路３１について説明した後で、設定回路３２について説明する。 The power adjustment device 30 includes a feedback circuit 31 and a setting circuit 32. Here, after first describing the feedback circuit 31, the setting circuit 32 will be described.
　フィードバック回路３１は、二次電池３９に対する充電電力及び放電電力についての電力センサ３３と、制限回路３４と、スイッチ回路３５とを備える。フィードバック回路３１は、二次電池３９に対する充電電力の電力値を示す充電電力値Ｐ1及び放電電力の電力値を示す放電電力値Ｐ2が、それぞれ対応する充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を超えないようにフィードバック制御を行う。 The feedback circuit 31 includes a power sensor 33 for charging power and discharging power for the secondary battery 39, a limiting circuit 34, and a switch circuit 35. The feedback circuit 31 has a charging power value P 1 indicating the charging power value of the secondary battery 39 and a discharging power value P 2 indicating the discharging power value corresponding to the charging power upper limit value P lim1 and discharging power, respectively. Feedback control is performed so as not to exceed the power upper limit value Plim2 .
　図２は、フィードバック回路３１の構成を示す図である。 FIG. 2 is a diagram showing the configuration of the feedback circuit 31. As shown in FIG.
　電力センサ３３は、二次電池３９と、スイッチ回路３５と、制限回路３４の増幅回路３４２との間に配置され、電力伝送経路１における充電電力値Ｐ1及び充電電力値Ｐ2を常時検出する検出部である。また、電力センサ３３によって検出された電力値は、制限回路３４の増幅回路３４２に供給される。 Power sensor 33 includes a secondary battery 39, a switch circuit 35 is placed between the amplifier circuit 342 of the limiting circuit 34, to constantly detect the charging power value P 1 and the charging power value P 2 in the power transmission path 1 It is a detection unit. Further, the power value detected by the power sensor 33 is supplied to the amplifier circuit 342 of the limit circuit 34.
　スイッチ回路３５は、電力伝送経路１を遮断または接続する回路である。すなわち、スイッチ回路３５がオンのときは電力伝送経路１を接続し、スイッチ回路３５がオフのときは電力伝送経路１を遮断する。スイッチ回路３５の具体的な構成等については後述する。 The switch circuit 35 is a circuit that cuts off or connects the power transmission path 1. That is, the power transmission path 1 is connected when the switch circuit 35 is on, and the power transmission path 1 is cut off when the switch circuit 35 is off. A specific configuration and the like of the switch circuit 35 will be described later.
　制限回路３４は、増幅回路３４２と、Ａ／Ｄ変換回路３４４と、制御部３４６と、レベルシフト回路３４８とを備える。 The limiting circuit 34 includes an amplification circuit 342, an A / D conversion circuit 344, a control unit 346, and a level shift circuit 348.
　増幅回路３４２は、電力センサ３３とＡ／Ｄ変換回路３４４との間に配置される回路である。また、増幅回路３４２は、電力センサ３３によって検出された電力値を増幅し、Ａ／Ｄ変換回路３４４へと供給する。 The amplification circuit 342 is a circuit disposed between the power sensor 33 and the A / D conversion circuit 344. The amplifier circuit 342 amplifies the power value detected by the power sensor 33 and supplies the amplified power value to the A / D conversion circuit 344.
　Ａ／Ｄ変換回路３４４は、増幅回路３４２と制御部３４６との間に配置される回路である。また、Ａ／Ｄ変換回路３４４は、増幅回路３４２によって増幅された電力値を、アナログ値からデジタル値へと変換して制御部３４６へ供給する。なお、Ａ／Ｄ変換回路３４４のビット数は、例えば、１２ビットであり、後述するＡ／Ｄ変換回路３６３に比べて分解能が高く、より高精度なＡ／Ｄ変換を行うことができる。 The A / D conversion circuit 344 is a circuit disposed between the amplification circuit 342 and the control unit 346. In addition, the A / D conversion circuit 344 converts the power value amplified by the amplification circuit 342 from an analog value to a digital value and supplies the converted value to the control unit 346. Note that the number of bits of the A / D conversion circuit 344 is, for example, 12 bits, and the resolution is higher than that of an A / D conversion circuit 363 described later, and more accurate A / D conversion can be performed.
　レベルシフト回路３４８は、制御部３４６とスイッチ回路３５との間に配置される回路である。また、レベルシフト回路３４８は、制御部３４６から供給された出力信号のレベル変換を行い、スイッチ回路３５のオンまたはオフのための制御信号としてスイッチ回路３５へ供給する。 The level shift circuit 348 is a circuit disposed between the control unit 346 and the switch circuit 35. The level shift circuit 348 converts the level of the output signal supplied from the control unit 346 and supplies it to the switch circuit 35 as a control signal for turning on or off the switch circuit 35.
　制御部３４６は、Ａ／Ｄ変換回路３４４の出力と設定回路３２から入力される充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を入力信号とする。そして、制御部３４６は、スイッチ回路３５の制御信号の元となる信号をレベルシフト回路３４８に出力する。制御部３４６は、電力センサ３３、増幅回路３４２、Ａ／Ｄ変換回路３４４、制御部３４６、レベルシフト回路３４８及びスイッチ回路３５を接続するフィードバック経路を用い、充電電力値Ｐ1及び放電電力値Ｐ2が、設定回路３２によって設定された充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を超えないようにスイッチ回路３５のスイッチング制御を行う制御回路である。なお、制御部３４６は、例えば、ＣＰＵを用いて構成することができるが、もちろん、その他の回路を用いて構成してもよい。例えば、組み合わせ回路を用いて構成することもできる。 The control unit 346 uses the output of the A / D conversion circuit 344 and the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 input from the setting circuit 32 as input signals. Then, the control unit 346 outputs a signal that is a source of the control signal of the switch circuit 35 to the level shift circuit 348. The control unit 346 uses a feedback path connecting the power sensor 33, the amplifier circuit 342, the A / D conversion circuit 344, the control unit 346, the level shift circuit 348, and the switch circuit 35, and uses the charging power value P 1 and the discharging power value P. A control circuit 2 performs switching control of the switch circuit 35 so as not to exceed the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 set by the setting circuit 32. The control unit 346 can be configured using a CPU, for example, but may be configured using other circuits. For example, a combination circuit can be used.
　ここで、制御部３４６の動作について、図３を用いて説明する。図３は、制御部３４６の動作手順を示すフローチャートである。 Here, the operation of the control unit 346 will be described with reference to FIG. FIG. 3 is a flowchart showing an operation procedure of the control unit 346.
　制御部３４６は、電力センサ３３から取得する検出信号に基づいて、電力伝送経路１を流れる電力値が、充電電力値Ｐ1であるか否かを判断する（Ｓ２）。なお、制御部３４６は、Ｓ２の処理を行う前に、スイッチ回路３５をオンさせるための信号を出力する。ここで、例えば、充電電力が流れる方向が正の値となるように電力センサ３３を設定すると、充電電力とは反対方向に流れる放電電力が負の値として検出されるため、充電電力値Ｐ1と放電電力値Ｐ2の区別を行うことができる。 Control unit 346, based on the detection signal obtained from the power sensor 33, power value flowing through the power transmission path 1, it is determined whether the charging power value P 1 (S2). The control unit 346 outputs a signal for turning on the switch circuit 35 before performing the process of S2. Here, for example, if the power sensor 33 is set so that the direction in which the charging power flows is a positive value, the discharging power flowing in the opposite direction to the charging power is detected as a negative value, and thus the charging power value P 1 And the discharge power value P 2 can be distinguished.
　Ｓ２の工程において、電力伝送経路１を流れる電力値が充電電力値Ｐ1であると判断したときは、充電用電力上限値Ｐlim1＞充電電力値Ｐ1であるか否かを判断する（Ｓ４）。 In S2 of the step, when the power value through the power transmission path 1 is determined as the charging power value P 1, the charging power upper limit value P lim1> determines whether the charging power value P 1 (S4 ).
　そして、Ｓ４の工程において、充電用電力上限値Ｐlim1＞充電電力値Ｐ1であると判断した場合には、スイッチ回路３５を常時オンさせるための信号を出力する（Ｓ８）。 If it is determined in step S4 that the charging power upper limit value P lim1 > the charging power value P 1 , a signal for always turning on the switch circuit 35 is output (S8).
　また、Ｓ４の工程において、充電用電力上限値Ｐlim1＞充電電力値Ｐ1でないと判断した場合には、Ｐlim1／Ｐ1のＤｕｔｙ比でスイッチ回路３５のオンまたはオフを繰り返させるための信号を出力する（Ｓ１０）。 If it is determined in step S4 that the charging power upper limit value P lim1 > charging power value P 1 is not satisfied, a signal for repeatedly turning on or off the switch circuit 35 with a duty ratio of P lim1 / P 1. Is output (S10).
　Ｓ２の工程において、電力伝送経路１を流れる電力値が充電電力値Ｐ1でないと判断したときは、電力伝送経路１を流れる電力値は放電電力値Ｐ2であるので、放電用電力上限値Ｐlim2＞放電電力値Ｐ2であるか否かを判断する（Ｓ６）。 In S2 of the step, when the power value through the power transmission path 1 is determined not charging power value P 1, since the power value flowing through the power transmission path 1 is a discharge power value P 2, the discharge power upper limit value P lim2> it is determined whether or not the discharge power value P 2 (S6).
　そして、Ｓ６の工程において、放電用電力上限値Ｐlim2＞放電電力値Ｐ2であると判断した場合には、Ｓ８の工程へと進む。 If it is determined in step S6 that the discharge power upper limit value P lim2 > discharge power value P 2 , the process proceeds to step S8.
　また、Ｓ６の工程において、放電電力上限値Ｐlim2＞放電電力値Ｐ2でないと判断した場合には、Ｐlim2／Ｐ2のＤｕｔｙ比でスイッチ回路３５のオンまたはオフを繰り返させるための信号を出力する（Ｓ１２）。 If it is determined in step S6 that the discharge power upper limit value P lim2 > discharge power value P 2 is not satisfied, a signal for repeatedly turning on or off the switch circuit 35 with a duty ratio of P lim2 / P 2 is generated. Output (S12).
　Ｓ８の工程とＳ１０の工程とＳ１２の工程の後は、それぞれリターン処理を介してＳ２へ戻る。このように、制御部３４６によれば、電力伝送経路１を流れる電力値が充電電力値Ｐ1、放電電力値Ｐ2のいずれであるかを判断することができる。そして、電力伝送経路１を流れる電力値が充電電力値Ｐ1と判断し、充電電力値Ｐ1が充電用電力上限値Ｐlim1を超えた場合には、充電用電力上限値Ｐlim1となるまでＤｕｔｙ比を適宜変更するフィードバック制御を行うことで、充電電力値Ｐ1が充電用電力上限値Ｐlim1以下となるように制限する。また、電力伝送経路１を流れる電力値が放電電力値Ｐ2と判断し、放電電力値Ｐ2が放電用電力上限値Ｐlim2を超えた場合には、放電用電力上限値Ｐlim2となるまでＤｕｔｙ比を適宜変更するフィードバック制御を行うことで、放電電力値Ｐ2が放電用電力上限値Ｐlim2以下となるように制限する。なお、設定回路３２によって充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2が変更された場合には、変更後の電力上限値Ｐlim1，Ｐlim2によって上記各工程を実行する。 After the steps S8, S10, and S12, the process returns to S2 via the return process. As described above, the control unit 346 can determine whether the power value flowing through the power transmission path 1 is the charging power value P 1 or the discharging power value P 2 . Then, until it is determined power value flowing through the power transmission path 1 is the charging power value P 1, when the charging power value P 1 exceeds the charging power upper limit value P lim1 is a charging power upper limit value P lim1 By performing feedback control that appropriately changes the duty ratio, the charging power value P 1 is limited to be equal to or less than the charging power upper limit value P lim1 . Moreover, until it is determined power value flowing through the power transmission path 1 is a discharge power value P 2, when the discharge power value P 2 exceeds the discharge power upper limit value P lim2 is a discharge power upper limit value P lim2 By performing feedback control that appropriately changes the duty ratio, the discharge power value P 2 is limited to be equal to or less than the discharge power upper limit value P lim2 . In the case where the charging power upper limit value P lim1 and discharging power upper limit value P lim2 been changed by the setting circuit 32 executes the above steps by the power upper limit value P lim1, P lim2 after the change.
　次に、設定回路３２について説明する。設定回路３２は、二次電池３９の能力を超えないように充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を設定する。また、設定回路３２は、二次電池３９の蓄電状態を示すＳＯＣ（Ｓｔａｔｅ　ｏｆ　Ｃｈａｒｇｅ）、二次電池３９の温度、二次電池３９の劣化程度等を取得する。そして、設定回路３２は、二次電池３９から取得したＳＯＣ等に基づいて、二次電池３９に対する充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を変更する。設定回路３２によって設定された充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2は、制限回路３４の制御部３４６に伝送される。 Next, the setting circuit 32 will be described. The setting circuit 32 sets the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 so as not to exceed the capacity of the secondary battery 39. In addition, the setting circuit 32 obtains SOC (State of Charge) indicating the storage state of the secondary battery 39, the temperature of the secondary battery 39, the degree of deterioration of the secondary battery 39, and the like. Then, the setting circuit 32 changes the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 for the secondary battery 39 based on the SOC or the like acquired from the secondary battery 39. The charging power upper limit value P lim1 and the discharging power upper limit value P lim2 set by the setting circuit 32 are transmitted to the control unit 346 of the limiting circuit 34.
　ここで、設定回路３２の動作について、図４を用いて説明する。図４は、設定回路３２の動作手順を示すフローチャートである。 Here, the operation of the setting circuit 32 will be described with reference to FIG. FIG. 4 is a flowchart showing an operation procedure of the setting circuit 32.
　最初に、設定回路３２は、Ｐlim2＞Ｐlim1の関係を満たすように充電用電力上限値Ｐlim1と放電用電力上限値Ｐlim2を初期設定する（Ｓ２０）。 First, the setting circuit 32 initializes the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 so as to satisfy the relationship of P lim2 > P lim1 (S20).
　次に、二次電池３９のＳＯＣが予め定められた基準値Ａよりも大きいか否かを判断する（Ｓ２２）。基準値Ａは、二次電池３９の過充電限度等に基づいて設定される。Ｓ２２の工程において、二次電池３９のＳＯＣが基準値Ａよりも大きくないと判断すれば、Ｓ２４の工程へと進む。 Next, it is determined whether or not the SOC of the secondary battery 39 is greater than a predetermined reference value A (S22). The reference value A is set based on the overcharge limit of the secondary battery 39 and the like. If it is determined in step S22 that the SOC of the secondary battery 39 is not greater than the reference value A, the process proceeds to step S24.
　Ｓ２２の工程において、二次電池３９のＳＯＣが基準値Ａよりも大きいと判断すれば、過充電となることを防止するために、充電用電力上限値Ｐlim1を小さくし、放電用電力上限値Ｐlim2を大きくする（Ｓ２６）。Ｓ２６の工程の後は、リターン処理を介してＳ２２の工程へと戻る。Ｓ２６の工程により、二次電池３９が過充電状態となることを防止することができる。 In step S22, if it is determined that the SOC of the secondary battery 39 is larger than the reference value A, the charging power upper limit P lim1 is reduced to prevent overcharging, and the discharging power upper limit value is set. P lim2 is increased (S26). After step S26, the process returns to step S22 via return processing. By the process of S26, the secondary battery 39 can be prevented from being overcharged.
　Ｓ２４の工程では、二次電池３９のＳＯＣが基準値Ｂよりも小さいか否かを判断する（Ｓ２４）。基準値Ｂは、二次電池３９の過放電限度等に基づいて定められる。Ｓ２４の工程において、二次電池３９のＳＯＣが基準値Ｂよりも小さくないと判断すれば、リターン処理を介してＳ２２の工程へと戻る。 In step S24, it is determined whether or not the SOC of the secondary battery 39 is smaller than the reference value B (S24). The reference value B is determined based on the overdischarge limit of the secondary battery 39 and the like. If it is determined in step S24 that the SOC of the secondary battery 39 is not smaller than the reference value B, the process returns to step S22 via return processing.
　Ｓ２４の工程において、二次電池３９のＳＯＣが基準値Ｂよりも小さいと判断すれば、過放電となることを防止するために、Ｐlim2＞Ｐlim1の関係を満たしつつ、充電用電力上限値Ｐlim1を大きくし、放電用電力上限値Ｐlim2を小さくする（Ｓ２８）。Ｓ２８の工程の後は、リターン処理を介してＳ２２の工程へと戻る。Ｓ２８の工程により、二次電池３９が過放電状態となることを防止することができる。 In step S24, if it is determined that the SOC of the secondary battery 39 is smaller than the reference value B, the charging power upper limit value is satisfied while satisfying the relationship P lim2 > P lim1 in order to prevent overdischarge. P lim1 is increased and the discharge power upper limit P lim2 is decreased (S28). After step S28, the process returns to step S22 via return processing. By the process of S28, the secondary battery 39 can be prevented from being overdischarged.
　上記のように、設定回路３２によれば、充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を異なる値に設定できるとともに、二次電池３９のＳＯＣの値に応じて、充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を変更することもできる。 As described above, according to the setting circuit 32, the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 can be set to different values, and the charging power depends on the SOC value of the secondary battery 39. The upper limit value P lim1 and the discharge power upper limit value P lim2 can be changed.
　次に、スイッチ回路３５について説明する。スイッチ回路３５は、電力センサ３３と、端子７とを接続し、電力伝送経路１を遮断または接続する。すなわち、スイッチ回路３５がオンのときは電力伝送経路１を接続し、スイッチ回路３５がオフのときは電力伝送経路１を遮断する。 Next, the switch circuit 35 will be described. The switch circuit 35 connects the power sensor 33 and the terminal 7, and cuts off or connects the power transmission path 1. That is, the power transmission path 1 is connected when the switch circuit 35 is on, and the power transmission path 1 is cut off when the switch circuit 35 is off.
　図５は、スイッチ回路３５の双方向性を示す図である。スイッチ回路３５は、トランジスタ３５１と、スイッチ部３５２と、電力源３５３と、トランジスタ３５４と、スイッチ部３５５と、電力源３５６とを備える。 FIG. 5 is a diagram showing the bidirectionality of the switch circuit 35. The switch circuit 35 includes a transistor 351, a switch unit 352, a power source 353, a transistor 354, a switch unit 355, and a power source 356.
　トランジスタ３５１は、電力センサ３３と端子７との間においてトランジスタ３５４と直列に接続されて設けられる。トランジスタ３５１は、パワーＭＯＳＦＥＴを用いて構成されるｎチャネルトランジスタである。ここで、トランジスタ３５１のボディーダイオード３５１ａのカソード端子は、トランジスタ３５４のボディーダイオード３５４ａのカソード端子と接続される。 The transistor 351 is provided in series with the transistor 354 between the power sensor 33 and the terminal 7. The transistor 351 is an n-channel transistor configured using a power MOSFET. Here, the cathode terminal of the body diode 351a of the transistor 351 is connected to the cathode terminal of the body diode 354a of the transistor 354.
　スイッチ部３５２は、電力源３５３とトランジスタ３５１の間に配置される。スイッチ部３５２は、レベルシフト回路３４８からの制御信号によってオンまたはオフされる制御がなされる。そして、スイッチ部３５２がオンされたときに、電力源３５３の電力値がトランジスタ３５１のゲート－ソース間に与えられる。 The switch unit 352 is disposed between the power source 353 and the transistor 351. The switch unit 352 is controlled to be turned on or off by a control signal from the level shift circuit 348. When the switch unit 352 is turned on, the power value of the power source 353 is applied between the gate and the source of the transistor 351.
　なお、トランジスタ３５４と、スイッチ部３５５と、電力源３５６は、それぞれトランジスタ３５１と、スイッチ部３５２と、電力源３５３と同じ構成であるため、詳細な説明は省略する。 Note that the transistor 354, the switch unit 355, and the power source 356 have the same configurations as the transistor 351, the switch unit 352, and the power source 353, respectively, and thus detailed description thereof is omitted.
　ここで、スイッチ回路３５の動作について述べると、レベルシフト回路３４８からのオンオフ制御信号によってスイッチ部３５２及びスイッチ部３５５はオンオフする。 Here, the operation of the switch circuit 35 will be described. The switch unit 352 and the switch unit 355 are turned on and off by an on / off control signal from the level shift circuit 348.
　具体的には、充電装置２０から二次電池３９へ充電電力が流れる場合には、トランジスタ３５４がオフしトランジスタ３５１がオンするように制御される。これにより、トランジスタ３５４のボディーダイオード３５４ａとトランジスタ３５１のドレイン－ソースを介して充電電力が流れることとなる。一方、二次電池３９から負荷４４に放電電力が流れる場合には、トランジスタ３５１がオフしトランジスタ３５４は、オンするように制御される。これにより、トランジスタ３５１のボディーダイオード３５１ａとトランジスタ３５４のドレイン－ソースを介して放電電力が流れることとなる。このように、スイッチ回路３５では双方向に電力が流れる。 Specifically, when charging power flows from the charging device 20 to the secondary battery 39, the transistor 354 is turned off and the transistor 351 is turned on. As a result, charging power flows through the body diode 354a of the transistor 354 and the drain-source of the transistor 351. On the other hand, when discharge power flows from the secondary battery 39 to the load 44, the transistor 351 is turned off and the transistor 354 is controlled to turn on. As a result, discharge power flows through the body diode 351a of the transistor 351 and the drain-source of the transistor 354. Thus, in the switch circuit 35, power flows in both directions.
　また、レベルシフト回路３４８からスイッチ部３５２及びスイッチ部３５５に対してそれぞれオフ制御信号が出力されると、スイッチ部３５２及びスイッチ部３５５はオフする。これにより、電力源３５３、電力源３５６の出力電力がそれぞれトランジスタ３５１、トランジスタ３５４のゲート－ソース間が与えられないためトランジスタ３５１、トランジスタ３５４がオフする。すなわち、スイッチ回路３５がオフすることにより、二次電池３９に対する放電電力及び充電電力が流れる共通の電力伝送経路１が遮断される。 Further, when an off control signal is output from the level shift circuit 348 to the switch unit 352 and the switch unit 355, the switch unit 352 and the switch unit 355 are turned off. Accordingly, the output power of the power source 353 and the power source 356 is not applied between the gate and the source of the transistor 351 and the transistor 354, respectively, and thus the transistor 351 and the transistor 354 are turned off. That is, when the switch circuit 35 is turned off, the common power transmission path 1 through which the discharge power and the charge power for the secondary battery 39 flow is cut off.
　続いて、上記構成の蓄電システム１０の作用について説明する。 Subsequently, the operation of the power storage system 10 having the above configuration will be described.
　一般的に、二次電池３９に対する充電電力値、放電電力値についての充電電力の上限電力値及び放電電力の上限電力値は異なる。ここで、従来技術では、二次電池３９に対する充電電力経路と放電電力経路とを別々の経路に分けて、充電電力の上限電力値及び放電電力の上限電力値が設定することが考えられるが、経路数が増えると周辺回路の構成等が複雑になる可能性もあり、また、コスト増大にも繋がる可能性もあるが、従来技術がこのような構成であったのには、次のような理由がある。例えば、充電電力経路と放電電力経路を単純に共通の電力伝送経路にした場合には、二次電池３９の特性に悪影響を及ぼさないようにするために、充電電力と放電電力の低い方の電力上限値を蓄電システム１０の電力上限値と設定することとなる。これにより、充電電力と放電電力の高い方の電力上限値を最大限に活用することができない可能性があるためであった。 Generally, the upper limit power value of the charge power and the upper limit power value of the discharge power for the secondary battery 39 are different from each other. Here, in the prior art, it is considered that the charging power path and the discharging power path for the secondary battery 39 are divided into separate paths, and the upper limit power value of the charging power and the upper limit power value of the discharging power are set. If the number of routes increases, the configuration of peripheral circuits may become complicated, and it may lead to an increase in cost. However, the conventional technology has such a configuration as follows. There is a reason. For example, when the charge power path and the discharge power path are simply a common power transmission path, in order not to adversely affect the characteristics of the secondary battery 39, the lower power of the charge power and the discharge power The upper limit value is set as the power upper limit value of the power storage system 10. This is because there is a possibility that the power upper limit value with the higher charge power and discharge power cannot be utilized to the maximum extent.
　しかしながら、図１の構成の蓄電システム１０によれば、共通の電力伝送経路１に充電電力及び放電電力が伝送され、充電電力値Ｐ1、放電電力値Ｐ2のそれぞれに対して充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を異なる値で設定することができる。そして、図３を用いた制御部３４６の動作説明の際に述べたように、電力伝送経路１を流れる電力値が充電電力値Ｐ1と判断した場合には、充電電力値Ｐ1が充電用電力上限値Ｐlim1を超えないように制限する。また、電力伝送経路１を流れる電力値が放電電力値Ｐ2と判断した場合には、放電電力値Ｐ2が放電用電力上限値Ｐlim2を超えないように制限する。このように、充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2はそれぞれ異なる値が設定でき、さらに、充電電力値Ｐ1、放電電力値Ｐ2がそれぞれ充電用電力上限値Ｐlim1，放電用電力上限値Ｐlim2を超えないようにスイッチ回路３５のスイッチング制御が行われる。これにより、充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2のそれぞれを最大限に活用しつつ、充電電力及び放電電力を共通の電力伝送経路１に伝送させることができる。したがって、経路数を削減することができ、周辺回路の構成等も単純なものにすることができる。 However, according to the power storage system 10 having the configuration of FIG. 1, charging power and discharging power are transmitted to the common power transmission path 1, and the charging power upper limit is set for each of the charging power value P 1 and the discharging power value P 2. The value P lim1 and the discharge power upper limit value P lim2 can be set to different values. Then, as described in the explanation of the operation of the control unit 346 using FIG. 3, when the power value flowing through the power transmission path 1 is determined to be the charging power value P 1 , the charging power value P 1 is used for charging. It limits so that electric power upper limit Plim1 may not be exceeded. Also, when the power value through the power transmission path 1 is determined to discharge power value P 2 is discharge power value P 2 is limited so as not to exceed the discharge power limit value P lim2. Thus, the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 can be set to different values, and the charging power value P 1 and the discharging power value P 2 are respectively set to the charging power upper limit values P lim1 , Switching control of the switch circuit 35 is performed so as not to exceed the discharge power upper limit P lim2 . Thereby, it is possible to transmit the charging power and the discharging power to the common power transmission path 1 while maximally utilizing each of the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 . Therefore, the number of paths can be reduced, and the configuration of peripheral circuits can be simplified.
　次に、蓄電システム１０の変形例である蓄電システム１０ａについて説明する。図６は、蓄電システム１０ａを示す図である。蓄電システム１０ａと蓄電システム１０との相違は、制限回路３６であるため、以下では、制限回路３６を中心に説明する。 Next, a power storage system 10a that is a modification of the power storage system 10 will be described. FIG. 6 is a diagram illustrating the power storage system 10a. Since the difference between the power storage system 10a and the power storage system 10 is the limiting circuit 36, the following description will be focused on the limiting circuit 36.
　図７は、制限回路３６の構成を示す図である。制限回路３６は、増幅回路３６１と、ローパスフィルタ３６２と、Ａ／Ｄ変換回路３６３と、比較回路３６４と、Ｄ／Ａ変換回路３６５と、制御部３６６と、レベルシフト回路３６７とを備える。ここで、増幅回路３６１と、レベルシフト回路３６７は、蓄電システム１０の増幅回路３４２と、レベルシフト回路３４８と同じものであるため、詳細な説明は省略する。 FIG. 7 is a diagram showing a configuration of the limiting circuit 36. The limiting circuit 36 includes an amplifier circuit 361, a low-pass filter 362, an A / D conversion circuit 363, a comparison circuit 364, a D / A conversion circuit 365, a control unit 366, and a level shift circuit 367. Here, the amplifier circuit 361 and the level shift circuit 367 are the same as the amplifier circuit 342 and the level shift circuit 348 of the power storage system 10, and thus detailed description thereof is omitted.
　ローパスフィルタ３６２は、増幅回路３６１とＡ／Ｄ変換回路３６３の間に配置される。ローパスフィルタ３６２は、増幅回路３６１によって増幅された電力値であるアナログ値のうち低周波数の帯域成分を通過（フィルタリング）させて、Ａ／Ｄ変換回路３６３へ供給する。 The low pass filter 362 is disposed between the amplification circuit 361 and the A / D conversion circuit 363. The low-pass filter 362 passes (filters) a low-frequency band component of the analog value, which is the power value amplified by the amplifier circuit 361, and supplies it to the A / D conversion circuit 363.
　Ａ／Ｄ変換回路３６３は、ローパスフィルタ３６２と制御部３６６との間に配置される。Ａ／Ｄ変換回路３６３は、ローパスフィルタ３６２によってフィルタリングされた電力値をアナログ値からデジタル値へと変換して制御部３６６へ供給する。なお、Ａ／Ｄ変換回路３６３のビット数は１０ビットであるため、上述のＡ／Ｄ変換回路３４４に比べて分解能が低くなる。このため、Ａ／Ｄ変換精度も多少劣るので変換後の電力値がＡ／Ｄ変換回路３４４による変換後の電力値よりも粗い値となる。換言すれば、Ａ／Ｄ変換回路３６３から出力される電力値は平滑電力値となる。しかし、Ａ／Ｄ変換回路３６３は、Ａ／Ｄ変換回路３４４に比べて分解能が低い分、安価であるためコスト的なメリットがある。 The A / D conversion circuit 363 is disposed between the low-pass filter 362 and the control unit 366. The A / D conversion circuit 363 converts the power value filtered by the low-pass filter 362 from an analog value to a digital value and supplies the converted value to the control unit 366. Note that since the A / D conversion circuit 363 has 10 bits, the resolution is lower than that of the A / D conversion circuit 344 described above. For this reason, since the A / D conversion accuracy is somewhat inferior, the power value after conversion becomes a coarser value than the power value after conversion by the A / D conversion circuit 344. In other words, the power value output from the A / D conversion circuit 363 is a smooth power value. However, the A / D conversion circuit 363 is inexpensive because it has a lower resolution than the A / D conversion circuit 344, and thus has a cost advantage.
　Ｄ／Ａ変換回路３６５は、制御部３６６と比較回路３６４の間に配置される。制御部３６６から出力された基準電力値をデジタル値からアナログ値に変換して比較回路３６４に供給する。 The D / A conversion circuit 365 is disposed between the control unit 366 and the comparison circuit 364. The reference power value output from the control unit 366 is converted from a digital value to an analog value and supplied to the comparison circuit 364.
　比較回路３６４は、増幅回路３６１から入力される電力値と、Ｄ／Ａ変換回路３６５から入力される基準電力値と、を比較する。具体的には、比較回路３６４は、増幅回路３６１から入力される電力値が、Ｄ／Ａ変換回路３６５から入力される基準電力値を超える場合にはＨｉｇｈを出力し、当該電力値が基準電力値を超えない場合にはＬｏｗを出力する。 The comparison circuit 364 compares the power value input from the amplification circuit 361 with the reference power value input from the D / A conversion circuit 365. Specifically, the comparison circuit 364 outputs High when the power value input from the amplifier circuit 361 exceeds the reference power value input from the D / A conversion circuit 365, and the power value is the reference power. When it does not exceed the value, Low is output.
　制御部３６６は、Ａ／Ｄ変換回路３６３の出力と、比較回路３６４の出力と、設定回路３２から入力される充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2と、を入力信号とする。そして、制御部３６６は、スイッチ回路３５の制御信号の元となる信号をレベルシフト回路３６７に出力する。制御部３６６は、電力センサ３３、増幅回路３６１、ローパスフィルタ３６２、Ａ／Ｄ変換回路３６３、制御部３６６、レベルシフト回路３６７及びスイッチ回路３５を接続するフィードバック経路を用い、充電電力値Ｐ1及び放電電力値Ｐ2が設定回路３２によって設定された充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を超えないようにスイッチ回路３５のスイッチング制御を行う制御回路である。なお、Ａ／Ｄ変換回路３６３から出力される値は上記のように平滑電力値であるが、電力値に基づいて制御部３６６がフィードバック制御を行う点については、制御部３４６と同様であるため、具体的な制御の詳細な説明は省略する。 The control unit 366 receives the output of the A / D conversion circuit 363, the output of the comparison circuit 364, the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 input from the setting circuit 32 as input signals. To do. Then, the control unit 366 outputs a signal that is a source of the control signal of the switch circuit 35 to the level shift circuit 367. The control unit 366 uses a feedback path connecting the power sensor 33, the amplifier circuit 361, the low-pass filter 362, the A / D conversion circuit 363, the control unit 366, the level shift circuit 367, and the switch circuit 35, and uses the charging power value P 1 and The control circuit performs switching control of the switch circuit 35 so that the discharge power value P 2 does not exceed the charge power upper limit value P lim1 and the discharge power upper limit value P lim2 set by the setting circuit 32. Note that the value output from the A / D conversion circuit 363 is a smooth power value as described above, but is similar to the control unit 346 in that the control unit 366 performs feedback control based on the power value. Detailed description of the specific control will be omitted.
　また、制御部３６６は、比較回路３６４の出力がＨｉｇｈの期間中はスイッチ回路３５を強制的にオフするための停止信号を出力する。なお、制御部３６６は、上記Ｄ／Ａ変換回路３６５へ供給するための基準電力値を出力する。ここで、当該基準電力値は、二次電池３９に対する充電電力値Ｐ1、放電電力値Ｐ2が急峻に変化して充電用電力上限値Ｐlim1，放電用電力上限値Ｐlim2を超えるような場合、換言すれば、Ａ／Ｄ変換回路３６３では検出できないような急峻な電力変化があったことを検出するために予め求められた電力値である。 The control unit 366 outputs a stop signal for forcibly turning off the switch circuit 35 while the output of the comparison circuit 364 is High. The control unit 366 outputs a reference power value to be supplied to the D / A conversion circuit 365. Here, the reference power value is such that the charging power value P 1 and the discharging power value P 2 for the secondary battery 39 change sharply and exceed the charging power upper limit value P lim1 and the discharging power upper limit value P lim2. In other words, in other words, the power value is obtained in advance in order to detect a steep power change that cannot be detected by the A / D conversion circuit 363.
　続いて、上記構成の蓄電システム１０ａの作用について説明する。 Subsequently, the operation of the power storage system 10a having the above configuration will be described.
　蓄電システム１０ａにおいても、蓄電システム１０と同様に、制御部３６６の制御により、電力伝送経路１を流れる電力値が充電電力値Ｐ1と判断した場合には、充電電力値Ｐ1が充電用電力上限値Ｐlim1を超えないように制限する。また、電力伝送経路１を流れる電力値が放電電力値Ｐ2と判断した場合には、放電電力値Ｐ2が放電用電力上限値Ｐlim2を超えないように制限する。これにより、蓄電システム１０と同様に、経路数を削減することができ、周辺回路の構成等も単純なものにすることができる。 Also in the power storage system 10a, as in the power storage system 10, when the power value flowing through the power transmission path 1 is determined to be the charging power value P 1 by the control of the control unit 366, the charging power value P 1 is the charging power. It limits so that upper limit Plim1 may not be exceeded. Also, when the power value through the power transmission path 1 is determined to discharge power value P 2 is discharge power value P 2 is limited so as not to exceed the discharge power limit value P lim2. Thereby, like the power storage system 10, the number of paths can be reduced, and the configuration of peripheral circuits and the like can be simplified.
　また、蓄電システム１０ａにおいても、蓄電システム１０と同様に、設定回路３２の動作により、二次電池３９のＳＯＣが基準値Ａよりも大きいと判断すれば、過充電となることを防止するために、充電用電力上限値Ｐlim1を小さくし、放電用電力上限値Ｐlim2を大きくする。また、二次電池３９のＳＯＣが基準値Ｂよりも小さいと判断すれば、過放電となることを防止するために、充電用電力上限値Ｐlim1を大きくし、放電用電力上限値Ｐlim2を小さくする。これにより、蓄電システム１０と同様に、二次電池３９に対する負担が軽減されるため二次電池３９の特性の劣化を防止することができる。 Also, in the power storage system 10a, similarly to the power storage system 10, if it is determined that the SOC of the secondary battery 39 is larger than the reference value A by the operation of the setting circuit 32, in order to prevent overcharging. The charging power upper limit value P lim1 is decreased, and the discharging power upper limit value P lim2 is increased. If it is determined that the SOC of the secondary battery 39 is smaller than the reference value B, the charging power upper limit value P lim1 is increased and the discharging power upper limit value P lim2 is set to prevent overdischarge. Make it smaller. As a result, similarly to the power storage system 10, the burden on the secondary battery 39 is reduced, so that deterioration of the characteristics of the secondary battery 39 can be prevented.
　蓄電システム１０ａでは、Ａ／Ｄ変換回路３４４に比べて安価なＡ／Ｄ変換回路３６３によって変換された平滑電力値を用いて、二次電池３９に対する充電電力値Ｐ1、放電電力値Ｐ2が充電用電力上限値Ｐlim1，放電用電力上限値Ｐlim2を超えないようにスイッチ回路３５のスイッチング制御を行っている。そして、仮に、二次電池３９に対する充電電力値Ｐ1、放電電力値Ｐ2が急峻に変化して、充電用電力上限値Ｐlim1，放電用電力上限値Ｐlim2を超えるような場合、換言すれば、Ａ／Ｄ変換回路３６３では検出できないような急峻な電力変化があったとする。このような場合には、電力値の比較を行なう比較回路３６４によって充電用電力上限値Ｐlim1，放電用電力上限値Ｐlim2を超えたことが検出される。これにより、比較回路３６４がＨｉｇｈへと変化してスイッチ回路３５が強制的にオフされて、二次電池３９への充放電が停止されるため二次電池３９への負担を軽減することができる。これにより、Ａ／Ｄ変換回路３６３がＡ／Ｄ変換回路３４４に比べて精度が劣る点を補うことができる。したがって、蓄電システム１０ａでは、コスト的なメリットを確保しつつ、二次電池３９の特性の劣化を防止することができる。また、蓄電システム１０ａでは、比較回路３６４によって充電電力値Ｐ1、放電電力値Ｐ2の急峻な変化を検出するのでＡ／Ｄ変換回路３６３の時間的な分解能を下げることができ、制御部３６６の処理の負担を軽減することができる。なお、ここでは、Ｄ／Ａ変換回路３６５と比較回路３６４とをあわせた一組の回路を用いてスイッチ回路３５を制御するものとして説明したが、複数組の回路を用意してそれぞれ異なる閾値を検出するものとしてもよい。 In the power storage system 10a, the charging power value P 1 and the discharging power value P 2 for the secondary battery 39 are obtained using the smooth power value converted by the A / D conversion circuit 363, which is cheaper than the A / D conversion circuit 344. Switching control of the switch circuit 35 is performed so as not to exceed the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 . If the charging power value P 1 and the discharging power value P 2 for the secondary battery 39 change sharply and exceed the charging power upper limit value P lim1 and discharging power upper limit value P lim2 , in other words, For example, it is assumed that there is a steep power change that cannot be detected by the A / D conversion circuit 363. In such a case, the comparison circuit 364 that compares the power values detects that the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 have been exceeded. As a result, the comparison circuit 364 changes to High, the switch circuit 35 is forcibly turned off, and charging / discharging of the secondary battery 39 is stopped, so that the burden on the secondary battery 39 can be reduced. . Thus, it is possible to compensate for the inferior accuracy of the A / D conversion circuit 363 compared to the A / D conversion circuit 344. Therefore, in the power storage system 10a, it is possible to prevent the deterioration of the characteristics of the secondary battery 39 while securing the cost advantage. Further, in the power storage system 10a, since the comparison circuit 364 detects steep changes in the charging power value P 1 and the discharging power value P 2 , the temporal resolution of the A / D conversion circuit 363 can be lowered, and the control unit 366 The burden of processing can be reduced. Here, the switch circuit 35 is described as being controlled by using a set of circuits including the D / A conversion circuit 365 and the comparison circuit 364. However, a plurality of sets of circuits are prepared and different threshold values are set. It may be detected.
　なお、上記蓄電システム１０，１０ａでは、設定回路３２は、二次電池３９から取得したＳＯＣに基づいて、充電用電力上限値Ｐlim1，放電用電力上限値Ｐlim2を変更するものとして説明したが、もちろん、その他の情報を用いて変更してもよい。例えば、一般的に、新品の二次電池と使用中の二次電池とを比較すると、使用中の二次電池の方が新品の二次電池に比べると充電量が小さく、充電しにくい状態となる。したがって、二次電池３９の劣化状態に応じて充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を変更するものとしてもよい。また、一般的に、二次電池３９の温度が低い状態では高い状態に比べて充電しにくい状態となる。したがって、二次電池３９の温度に応じて充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を変更するものとしてもよい。なお、二次電池３９のＳＯＣが低い場合には、予備充電が必要な場合があり、この場合には充電用電力上限値Ｐlim1及び放電用電力上限値Ｐlim2を下げる必要がある。 In the power storage systems 10 and 10a, the setting circuit 32 has been described as changing the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 based on the SOC acquired from the secondary battery 39. Of course, it may be changed using other information. For example, in general, when comparing a new secondary battery with a secondary battery in use, the secondary battery in use is less charged and more difficult to charge than a new secondary battery. Become. Therefore, the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 may be changed according to the deterioration state of the secondary battery 39. Further, in general, when the temperature of the secondary battery 39 is low, it is difficult to charge compared to a high state. Therefore, the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 may be changed according to the temperature of the secondary battery 39. When the SOC of the secondary battery 39 is low, preliminary charging may be necessary. In this case, it is necessary to lower the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 .
　上記以外にも、例えば、設定回路３２は、蓄電システム１０，１０ａが設置される施設の時間帯に基づいて、充電用電力上限値Ｐlim1，放電用電力上限値Ｐlim2を変更することができる。例えば、太陽電池モジュール１１の発電電力が期待できる昼間は、発電電力を最大限に充電できるように充電用電力上限値Ｐlim1を大きく設定する。また、安価な深夜電力にて充電する場合には深夜時間帯を通して、充電が完了すればよく、充電電流値Ｐ1を下げるように充電用電力上限値Ｐlim1を設定する。なお、充電電力が小さいほど、二次電池３９の特性劣化を抑制することができる。 In addition to the above, for example, the setting circuit 32 can change the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 based on the time zone of the facility where the power storage systems 10 and 10a are installed. . For example, during the daytime when the generated power of the solar cell module 11 can be expected, the charging power upper limit P lim1 is set large so that the generated power can be charged to the maximum. Further, in the case of charging with inexpensive late-night power, charging only needs to be completed through the late-night time zone, and the charging power upper limit value P lim1 is set so as to lower the charging current value P 1 . In addition, the characteristic deterioration of the secondary battery 39 can be suppressed, so that charging power is small.
　さらに、上記蓄電システム１０，１０ａにおいて、充電用電力上限値Ｐlim1，放電用電力上限値Ｐlim2の設定は設定回路３２が行うものとして説明したが、制限回路３４の制御部３４６において設定してもよく、制御装置２５において設定してもよい。 Further, in the power storage systems 10 and 10a , the setting of the charging power upper limit value P lim1 and the discharging power upper limit value P lim2 has been described as being performed by the setting circuit 32, but the setting is performed by the control unit 346 of the limiting circuit 34. Alternatively, it may be set in the control device 25.
　そして、上記蓄電システム１０，１０ａにおいて、電力調整装置３０による調整対象は電力であるものとして説明したが、電流であってもよく、電圧であってもよい。 In the power storage systems 10 and 10a, the adjustment target by the power adjustment device 30 has been described as being electric power, but it may be current or voltage.
　また、上記蓄電システム１０，１０ａでは、充電装置２０及び蓄電装置２８から電力が供給される負荷は、負荷４４の１つであるとして説明したが、もちろん、それ以上の負荷が接続されてもよい。また、負荷の種類はＤＣ負荷、ＡＣ負荷のいずれであってもよい。 In the power storage systems 10 and 10a, the load supplied with power from the charging device 20 and the power storage device 28 has been described as one of the loads 44. Of course, more loads may be connected. . Further, the type of load may be either a DC load or an AC load.
　１，２，３，４　電力伝送経路、５  　端子、６　接続点、７　端子、１０，１０ａ　蓄電システム、１１　太陽電池モジュール、１２　直並列切替回路、１３　経路切替回路、１４　系統電力源、１５　ＤＣ／ＡＣ変換回路、１６　ＡＣ／ＤＣ変換回路、１７，１８　スイッチ回路、２０　充電装置、２５　制御装置、２６　制御回路、２８　蓄電装置、３０　電力調整装置、３１　フィードバック回路、３２　設定回路、３３　電力センサ、３４　制限回路、３５　スイッチ回路、３６　制限回路、３９　二次電池、４０　負荷装置、４２　スイッチ回路、４４　負荷、１１１，１１２　光電変換部、３４２　増幅回路、３４４　Ａ／Ｄ変換回路、３４６　制御部、３４８　レベルシフト回路、３５１　トランジスタ、３５１ａ　ボディーダイオード、３５２　スイッチ部、３５３　電力源、３５４　トランジスタ、３５４ａ　ボディーダイオード、３５５　スイッチ部、３５６　電力源、３６１　増幅回路、３６２　ローパスフィルタ、３６３　Ａ／Ｄ変換回路、３６４　比較回路、３６５　Ｄ／Ａ変換回路、３６６　制御部、３６７　レベルシフト回路。 1, 2, 3, 4 Power transmission path, 5 terminal, 6 connection point, 7 terminal, 10, 10a power storage system, 11 solar cell module, 12 series-parallel switching circuit, 13 path switching circuit, 14 grid power source, 15 DC / AC conversion circuit, 16 AC / DC conversion circuit, 17, 18 switch circuit, 20 charging device, 25 control device, 26 control circuit, 28 power storage device, 30 power adjustment device, 31 feedback circuit, 32 setting circuit, 33 power sensor , 34 limit circuit, 35 switch circuit, 36 limit circuit, 39 secondary battery, 40 load device, 42 switch circuit, 44 load, 111, 112 photoelectric conversion unit, 342 amplification circuit, 344 A / D conversion circuit, 346 control unit 348 Level shift circuit, 351 transistor, 351a body Diode, 352 switch unit, 353 power source, 354 transistor, 354a body diode, 355 switch unit, 356 power source, 361 amplification circuit, 362 low-pass filter, 363 A / D conversion circuit, 364 comparison circuit, 365 D / A conversion circuit 366 Control unit, 367 Level shift circuit.

Claims (8)

  1. 　充電装置から二次電池への充電電力及び前記二次電池から負荷装置への放電電力が伝送される共通の電力伝送経路に前記充電電力が伝送されるときは充電用電力上限値で充電電力値を制限し、
    　前記共通の電力伝送経路に前記放電電力が伝送されるときは放電用電力上限値で放電電力値を制限する制限回路
    　を備えるフィードバック回路。     When the charging power is transmitted to a common power transmission path through which charging power from the charging device to the secondary battery and discharging power from the secondary battery to the load device is transmitted, the charging power value is a charging power upper limit value. Limit
    A feedback circuit comprising: a limiting circuit that limits a discharge power value with a discharge power upper limit value when the discharge power is transmitted to the common power transmission path.
  2. 　請求項１に記載のフィードバック回路において、
    　前記共通の電力伝送経路を遮断または接続するスイッチ回路と、
    　前記共通の電力伝送経路に伝送される電力値を検出する検出部と、を備え、
    　前記制限回路は、
    　前記検出部によって検出された電力値が前記充電電力値の場合には、前記充電用電力上限値を超えないように前記スイッチ回路のスイッチング制御を行い、
    　前記検出部によって検出された電力値が前記放電電力値の場合には、前記放電用電力上限値を超えないように前記スイッチ回路のスイッチング制御を行うフィードバック回路。     The feedback circuit of claim 1, wherein
    A switch circuit for cutting off or connecting the common power transmission path;
    A detection unit for detecting a power value transmitted to the common power transmission path,
    The limiting circuit is:
    When the power value detected by the detection unit is the charging power value, the switching control of the switch circuit is performed so as not to exceed the charging power upper limit value,
    When the power value detected by the detection unit is the discharge power value, a feedback circuit that performs switching control of the switch circuit so as not to exceed the discharge power upper limit value.
  3. 　請求項２に記載のフィードバック回路において、
    　前記スイッチ回路は、
    　前記共通の電力伝送経路に設けられる第１トランジスタと、
    　前記第１トランジスタと直列接続され、ボディーダイオードの一方側端子が前記第１トランジスタのボディーダイオードの一方側端子と接続される第２トランジスタと、
    　前記第１トランジスタをオンまたはオフするための第１スイッチ部と、
    　前記第２トランジスタをオンまたはオフするための第２スイッチ部と、
    　を含むフィードバック回路。     The feedback circuit according to claim 2, wherein
    The switch circuit is
    A first transistor provided in the common power transmission path;
    A second transistor connected in series with the first transistor, wherein one terminal of the body diode is connected to one terminal of the body diode of the first transistor;
    A first switch for turning on or off the first transistor;
    A second switch unit for turning on or off the second transistor;
    Including feedback circuit.
  4. 　請求項２または請求項３に記載のフィードバック回路において、
    　前記制限回路は、
    　前記検出部によって検出された電力値を増幅する増幅回路と、
    　前記増幅回路の出力であるアナログ値をデジタル値に変換するＡ／Ｄ変換回路と、
    　前記Ａ／Ｄ変換回路の出力に基づいて前記スイッチング制御を行う制御回路と、
    　を備えるフィードバック回路。     The feedback circuit according to claim 2 or claim 3,
    The limiting circuit is:
    An amplification circuit that amplifies the power value detected by the detection unit;
    An A / D conversion circuit that converts an analog value that is an output of the amplifier circuit into a digital value;
    A control circuit for performing the switching control based on an output of the A / D conversion circuit;
    A feedback circuit comprising:
  5. 　請求項２または請求項３に記載のフィードバック回路において、
    　前記制限回路は、
    　前記検出部によって検出された電力値を増幅する増幅回路と、
    　前記増幅回路の出力であるアナログ値の低周波数領域を通過させるローパスフィルタと、
    　前記ローパスフィルタの出力であるアナログ値をデジタル値に変換するＡ／Ｄ変換回路と、
    　前記増幅回路の出力と予め定められた基準電力値とを比較する比較回路と、
    　前記Ａ／Ｄ変換回路の出力に基づいて前記スイッチング制御を行うとともに、前記比較回路の出力に基づいて前記スイッチ回路を強制的にオフさせる制御を行う制御回路と、
    　を備えるフィードバック回路。     The feedback circuit according to claim 2 or claim 3,
    The limiting circuit is:
    An amplification circuit that amplifies the power value detected by the detection unit;
    A low-pass filter that passes through a low frequency region of an analog value that is an output of the amplifier circuit;
    An A / D conversion circuit that converts an analog value that is an output of the low-pass filter into a digital value;
    A comparison circuit for comparing the output of the amplifier circuit with a predetermined reference power value;
    A control circuit that performs the switching control based on the output of the A / D conversion circuit, and performs the control to forcibly turn off the switch circuit based on the output of the comparison circuit;
    A feedback circuit comprising:
  6. 　請求項１から請求項５のいずれか１に記載のフィードバック回路において、
    　前記放電用電力上限値は、前記充電用電力上限値よりも大きいフィードバック回路。     The feedback circuit according to any one of claims 1 to 5,
    The discharging power upper limit value is a feedback circuit larger than the charging power upper limit value.
  7. 　請求項１から請求項６のいずれか１に記載のフィードバック回路において、
    　前記放電用電力上限値及び前記充電用電力上限値は、前記二次電池の蓄電状態に応じて設定されるフィードバック回路。     The feedback circuit according to any one of claims 1 to 6,
    The discharging power upper limit value and the charging power upper limit value are set according to a storage state of the secondary battery.
  8. 　請求項１から請求項７のいずれか１に記載のフィードバック回路と、
    　前記充電用電力上限値及び前記放電用電力上限値をそれぞれ設定する設定回路と、
    　を備える電力調整装置。     A feedback circuit according to any one of claims 1 to 7,
    A setting circuit configured to set the charging power upper limit value and the discharging power upper limit value, respectively;
    A power adjustment device comprising:
PCT/JP2012/068464 2011-07-21 2012-07-20 Feedback circuit and power adjusting device WO2013012064A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11187577A (en) * 1997-10-13 1999-07-09 Toyota Motor Corp Charge/discharge controller for secondary battery
JP2007236151A (en) * 2006-03-03 2007-09-13 Panasonic Ev Energy Co Ltd Charging/discharging control system for secondary battery, battery control apparatus, and program
JP2010104095A (en) * 2008-10-21 2010-05-06 Toyota Motor Corp Power supply system, vehicle equipped with the same, and control method of power supply system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11187577A (en) * 1997-10-13 1999-07-09 Toyota Motor Corp Charge/discharge controller for secondary battery
JP2007236151A (en) * 2006-03-03 2007-09-13 Panasonic Ev Energy Co Ltd Charging/discharging control system for secondary battery, battery control apparatus, and program
JP2010104095A (en) * 2008-10-21 2010-05-06 Toyota Motor Corp Power supply system, vehicle equipped with the same, and control method of power supply system

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