JP2007274832A - Power supply apparatus, and control method of power supply apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply apparatus capable of adjusting the power capacity of a power storage means while an ignition key is off. <P>SOLUTION: While the ignition key is turned off, a switch drive means 6b is operated by supplying power from a power supply 4 for an auxiliary machine; second switch means SW1-SW5 are driven so that the own adjustment of capacity is performed to each of a plurality of power storage means 1a, 1b for connecting the plurality of power storage means in parallel; the power of the plurality of power storage means driven by the switch drive means for parallel connection is converted; the switch drive means is operated by supplying power from a power transducer 3 for supplying power to the switch drive means; and a second switch means is driven. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power supply apparatus and a control method for the power supply apparatus.

An electric vehicle incorporates a vehicle power supply device having a plurality of power storage means that can be electrically connected to a vehicle driving motor (see Patent Document 1). The vehicle power supply device disclosed in Patent Document 1 is configured to be able to switch a plurality of power storage means to a serial connection or a parallel connection, and by switching the series storage of the plurality of power storage means, The output voltage is changed. Specifically, when the required applied voltage is small, a plurality of power storage means are connected in parallel to reduce the output voltage, and when the required applied voltage is large, the plurality of power storage means are connected in series. To increase the output voltage.
Japanese Patent Laid-Open No. 5-236608

  However, since a plurality of power storage means are used, there may be variations in power capacity between the power storage means. Therefore, it is necessary to adjust the power capacity of the power storage means.

  An object of the present invention is to provide a power supply device that can adjust the power capacity of a power storage means, particularly in a state where an ignition key is turned off.

The invention according to claim 1 for achieving the above object includes a plurality of power storage means for supplying electric power to an inverter connected to a vehicle driving motor;
A first switch means disposed in a circuit for supplying power from the plurality of power storage means to the inverter, and shuts off the power supply from the plurality of power storage means to the inverter when an ignition key is turned off; ,
A second switch means disposed in a circuit for connecting the plurality of power storage means in parallel, and self-adjusting the capacity of each of the plurality of power storage means by connecting the plurality of power storage means in parallel;
An auxiliary power supply for supplying power to the auxiliary equipment mounted on the vehicle;
A power converter that converts and outputs power of the plurality of power storage means connected in parallel by the second switch means;
Switch driving means for driving the second switch means and the power converter by supplying power from the auxiliary power source and / or the power converter;
When the operation of the switch driving means is controlled, the ignition key is turned off, and the supply of power from the plurality of power storage means to the vehicle driving motor is interrupted by the first switch means, the auxiliary machine Control means for driving the second switch means in parallel by driving the second switch means by supplying power from a power source and driving the second switch means by supplying power from the power converter. It is the electric power supply apparatus which has.

  According to the present invention, the ignition key is turned off by providing the power converter that adjusts the power of the plurality of power storage means connected in parallel and supplies power to the drive means that drives the switch that switches the connection of the plurality of power storage means. In this state, once a plurality of power storage means are connected by supplying power from the auxiliary power supply, it becomes possible to supply switch driving power to the switch from the plurality of power storage means by the power converter. Regardless of the power supply, the capacity adjustment of the power storage means can be ended, and thus the power capacity adjustment of a plurality of power storage means can be performed.

  Hereinafter, a power supply device and a method for controlling the power supply device according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a power supply apparatus according to the present invention, FIGS. 2 and 3 show flowcharts of a control method of the power supply apparatus, and FIGS. 4 to 6 show various connection states of power storage means of the power supply apparatus in the flowcharts. Indicates.

  FIG. 1 is a diagram showing an outline of a vehicle according to the present invention and a configuration of a power supply device 1 (corresponding to a power supply device). The power supply device 1 includes a plurality of switches SW1 to 5 (second switches) for switching a plurality of batteries 1a and 1b (corresponding to a plurality of power storage means), a charging resistor 2, and the batteries 1a and 1b and the charging resistor 2. A circuit unit 1α having a DCDC converter 3 (corresponding to a power converter) connected to an output terminal of the circuit unit 1α, and switches SW1 to SW5 of the circuit unit 1β. And a switch drive circuit 6b for driving the DCDC converter 3 (corresponding to switch driving means), a battery 4 for supplying power to the switch drive circuit 6b (corresponding to an auxiliary power source), a battery 4 and a switch drive circuit 6b The relay switch SW7 (corresponding to the third switch means) for switching the connection of the switch and the command from the ignition (IGN) key 13 are received. , And a controller 6a for controlling the actuation of the switch drive circuit 6b (corresponding to control means). The DCDC converter 3 can be connected to the switch drive circuit 6b similarly to the battery 4 and can supply power to the switch drive circuit 6b. Further, the DCDC converter 3 is connected to the battery 4, and a circuit for connecting to the switch drive circuit 6b is provided on the path connecting the DCDC converter 3 and the battery 4, so that the battery 4 and the DCDC converter 3 group switch drive are provided. Connect to circuit 6b. However, a diode that can be energized only in one direction from the DCDC converter 3 to the battery 4 is provided on a circuit connecting the DCDC converter 3 and the battery 4. Thereby, the DCDC converter 3 can perform power conversion only in the direction from the batteries 1a and 1b to the switch drive circuit 6b. Further, a current sensor S5 is connected between the battery 4 and the relay switch SW7. Furthermore, the power supply device 1 is connected to the inverter 7 via a conductor switch SW6 (corresponding to a first switch) that cuts off the output from the batteries 1a and 1b at the output end of the circuit unit 1β having the above-described configuration. Then, the wheels 11 and 12 are driven via the motor 8 (corresponding to a vehicle driving motor), the transmission 9 and the differential gear 10. A voltage measuring device 14 for measuring the voltage across the charging resistor 2 is provided in the charging resistor 2 portion. In addition, the conductor switch SW6 and the relay switch SW7 are linked to the ignition key 13 and are naturally turned off. The batteries 1a and 1b are single batteries or a plurality of unit batteries connected in series, and are secondary batteries that can be electrically connected in series and parallel to the motor 8 via the inverter 7.

  Next, the configuration of the circuit portion 1α including the batteries 1a and 1b and the switches SW1 to 5 of the power supply device 1 illustrated in FIG. 1 will be described in detail.

  The switch SW1 is disposed on a path connecting the positive electrode of the battery 1a and the negative electrode of the battery 1b, and the charging resistor 2 is disposed between the positive electrode of the battery 1a and the switch SW1. Further, the switch SW2 is disposed on a path connecting from the path connecting the positive electrode of the battery 1a and the charging resistor 2 to the negative electrode of the battery 1b.

  Further, the switch SW3 is connected to the positive electrode of the inverter 7 from the path connecting the charging resistor 2 and the switch SW1 (hereinafter referred to as a connecting portion of the inverter 7 and connected to the positive electrode of the battery, and connected to the negative electrode of the inverter). (This will be referred to as the negative electrode of the inverter).

  Furthermore, the switch SW4 is arranged on a path connecting the positive electrode of the battery 1a and the positive electrode of the inverter 7, and the switch SW5 is arranged on a path connecting the negative electrode of the battery 1b and the negative electrode of the inverter 7.

  Thus, when only the switch SW1 is turned on, a path in which the battery 1a and the battery 1b are connected in series via the charging resistor 2 is formed with respect to the inverter 7, and when only the switch SW2 is turned on, the battery 1a is connected to the inverter 7. And a path in which the battery 1b is connected in series without the charging resistor 2 interposed therebetween. Furthermore, when only the switch SW3 is turned on, a path is formed in which the battery 1a is connected to the inverter 7 via the charging resistor 2, and when only the switch SW4 is turned on, the path is connected to the inverter 7 without the battery 1a being passed through the charging resistor 2. Form. Furthermore, when only the switch SW5 is turned on, a path for connecting only the battery 1b to the inverter 7 is formed.

  In the present embodiment, a state in which the switches SW3 and SW5 are mainly turned on and the battery 1a and the battery 1b are connected in parallel via the charging resistor 2 is used. The DCDC converter 3 is an output terminal of the circuit unit 1α as described above. When the plurality of batteries 1a and 1b are connected in parallel via the charging resistor 2, the plurality of batteries 1a, Connect to 1b. By connecting in this way, the DCDC converter 3 is connected to the plurality of batteries 1a and 1b only when the plurality of batteries 1a and 1b are connected in parallel.

  Next, a control method of the power supply apparatus 1 will be described along the flowchart of FIG.

This embodiment is a control method for adjusting the battery capacity after the ignition key 13 is turned off and the conductor switch SW6 is cut off and the power supply from the batteries 1a and 1b to the motor 8 is cut off. It should be noted that “t ₁ ” and “t ₂ ” in the flowchart generally refer to the time (t ₁ ) when the conductor SW 6 is turned off and the time (t ₁ ) when the relay switch SW 7 is turned off after the ignition key 13 is turned off. ₂ ), and this number is preset. However, the conductor switch SW6 is always turned off _first (t ₁ <t ₂ ). The flow representing the control method in the present embodiment is to end each step within the time until the conductor switch SW6 and the relay switch SW7 are naturally turned off after the ignition key 13 is turned off.

  First, when the ignition key 13 is turned off (step S1 (hereinafter, step S is abbreviated as “S”)), the switches SW1 to SW5 and the conductor switch SW6 are turned off (S2). Then, after the batteries 1a and 1b are completely disconnected from the inverter 7, by supplying power from the battery 4 (S3), the switches SW3 and 5 are turned on (S4), and the battery 1a and the battery 1b are connected to the charging resistor 2. And are connected in parallel (see FIG. 4). Then, the voltage applied to the charging resistor 2 at this time is measured (S5), and the potential difference between the battery 1a and the battery 1b and the current Ir flowing through the charging resistor 2 are calculated. Then, the preset upper limit current Imax (corresponding to a predetermined value) is compared with the current Ir (S6). The upper limit current Imax here is a current resulting from a potential difference between the batteries 1a and 1b in the closed circuit formed in Step 4, and is an upper limit of a current that can suppress an abnormal (inrush) current by the connected charging resistor 2. It is. It should be noted that the subsequent control is performed when there is a potential difference between the batteries 1a and 1b so that a current exceeding the upper limit current Imax set here flows (S6; NO).

  The subsequent control is shown in FIG. It should be noted that the process proceeds to A when YES in step S6; and to B when NO in step S6.

  When the current Ir is equal to or lower than the upper limit current Imax (S6; YES), the relay switch SW7 is turned off at this time (S10a). That is, when the current Ir is equal to or lower than the upper limit current Imax (S6; YES), it is determined that power capacity adjustment is not required thereafter. When the relay switch SW7 is turned off, the power supply to the switch drive circuit 6b is cut off, so that the switch SW3 and the switch SW5 are naturally turned off (S14), and the original switch is completely turned off (S2). In step S6, the current Ir due to the potential difference between the batteries 1a and 1b that has occurred below the upper limit current Imax is further reduced until the switches SW3 and 5 are naturally turned off (S14) after the relay switch SW7 is turned off (S10a). The capacity is self-adjusted and reduced.

  On the other hand, when the current Ir is larger than the upper limit current Imax in step 6 (S6; NO), the DCDC converter 3 is operated by power supply from the batteries 1a and 1b connected in parallel by power supply from the battery 4 (S7b). ), The battery 4 and the DCDC converter 3 start supplying power to the switch drive circuit 6b (see FIG. 5). In this state, the current Is in the current sensor 5 is measured, and power supply from the battery 4 to the switch drive circuit 6b is continued until the current Is becomes 0 (S8b; NO → S9b → S8b). When the output voltage from the DCDC converter 3 becomes equal to the output voltage of the battery 4 and the current Is flowing through the current sensor S5 becomes 0, the relay switch SW7 is turned off (S10b), and only from the DCDC converter 3 The power is supplied to the switch drive circuit 6b (see FIG. 6). At this time, after the relay switch SW7 is turned off, the controller 6a operates the DCDC converter 3 so that the input voltage from the DCDC converter 3 to the switch drive circuit 6b becomes equal to or higher than the guaranteed voltage (voltage necessary for switch driving) (S11b). ). Thereby, the switch drive circuit 6b can be driven only by the DCDC converter 3 without using the battery 4 for the subsequent control. In this state, the current Ir is again compared with the upper limit current Imax (S12b), and the DCDC converter 3 is continuously operated until the current Ir becomes equal to or lower than the upper limit current Imax, and the potential difference between the batteries 1a and 1b is determined by capacity self-adjustment. (S12b; NO → S11b → S12b). When the current Ir becomes equal to or lower than the upper limit current Imax (S12b; YES), the operation of the DCDC converter 3 is terminated (S13b). Then, no power is supplied to the switch drive circuit 6b, the switch SW3 and the switch SW5 are naturally turned off (S14), and the original switch is completely turned off (S2). In step S12b, the current Ir due to the potential difference between the batteries 1a and 1b that has occurred at or below the upper limit current Imax is further increased while the switches SW3 and 5 are naturally turned off (S14) after the DCDC converter 3 is operated (S13b). Self-adjustment and reduction.

  The power supply device 1 according to the present embodiment is arranged in batteries 1a and 1b for supplying power to an inverter 7 connected to a motor 8 and a circuit for supplying power to the inverter 7 from the batteries 1a and 1b. The conductor switch SW6 that cuts off the supply of power from the batteries 1a and 1b to the inverter 7 when the battery 13 is turned off and the circuit for connecting the batteries 1a and 1b in parallel are arranged in parallel. The switches SW3 and SW5 that adjust the capacity of each of the batteries 1a and 1b by connecting them, the battery 4 that supplies power to an auxiliary device mounted on the vehicle, and the power of the batteries 1a and 1b connected in parallel are converted. The DC / DC converter 3 for output and the power supply from the battery 4 and / or the DC / DC converter 3 allow the switch SW , SW5 and a switch drive circuit 6b for driving the DCDC converter 3, and a controller 6a for controlling the operation of the switch drive circuit 6b. The controller 6a turns off the ignition key 13 and turns the batteries 1a, 1b by the conductor switch SW6. When the power supply to the motor 8 is cut off, the switches SW3 and SW5 are driven by the power supply from the battery 4 to connect the batteries 1a and 1b in parallel, and the switch SW3 is supplied by the power supply from the DCDC converter 3. By driving SW5 and SW5, once the ignition key is turned off and the batteries 1a and 1b are disconnected from the inverter 7, once the plurality of batteries 1a and 1b are connected by power supply from the battery 4, DCDC converter 3 The switch driving power can be supplied to the switch from the plurality of batteries 1a and 1b, so that the battery 4 does not need to be used all the time, and the capacity adjustment of the plurality of batteries 1a and 1b can be performed regardless of the power supply from the battery 4. Further, the capacity adjustment can be completed, and thus the capacity adjustment of the plurality of batteries 1a and 1b can be performed when the batteries 1a and 1b and the inverter 7 are in the cut-off state while reducing the power consumption of the battery 4. Make it possible.

  Further, the DCDC converter 3 connects the batteries 1a and 1b in parallel by connecting the plurality of batteries 1a and 1b among the switches SW1 to SW5 to the output terminal of the circuit unit 1α via the switches SW3 and SW5. The power consumption can be suppressed as compared with the case where the battery can be operated only when connected to the battery 1a or 1b.

  Furthermore, when the potential difference between the plurality of batteries 1a and 1b connected in parallel is equal to or less than a predetermined value, the capacity adjustment between the batteries 1a and 1b is terminated and the parallel connection of the plurality of batteries 1a and 1b is released. Thus, power consumption is suppressed by terminating power supply from the plurality of batteries 1a and 1b before the capacity of the plurality of batteries 1a and 1b completely match, and according to the present embodiment, power supply is terminated. After that, since it takes some time until the switches 3 and 5 that connect the plurality of batteries 1a and 1b in parallel are turned off, the capacity can be further adjusted.

  Further, in this embodiment, “Ir ≦ Imax” is set as the condition in Step 6 and Step 12b. However, “Ir = 0”, that is, a case where no potential difference is generated between the battery 1a and the battery 1b from the beginning. Of course.

  Furthermore, in the present embodiment, the charging resistor 2 is used to suppress an abnormal (inrush) current when a plurality of batteries 1a and 1b are connected in parallel. For example, the same effect as a reactor is obtained. If it is obtained, the charging resistor 2 is not necessarily required.

  Similarly, the power converter is not limited to the DCDC converter 3 and may be any one that can convert power. Further, the conductor switch SW6 and the relay switch SW7 are not limited to this as long as they have a power cutoff function.

  In this embodiment, a circuit in which the DCDC converter 3 and the battery 4 are connected is used, but the same control is possible even if the DCDC converter 3 and the battery 4 are connected to the switch drive circuit 6b. is there. However, in that case, for example, a voltage sensor or the like is provided for each of the DCDC converter 3 and the battery 4, and when the voltages of the DCDC converter 3 and the battery 4 become equal in step S8b of FIG. do it.

  Further, in the present embodiment, the description has been made on the assumption that two power storage units are arranged in parallel. However, the present invention is not limited to this number, and the same effect can be obtained as long as the circuits are connected in parallel to achieve capacity self-adjustment. Can be obtained.

It is a figure which shows the electric power supply apparatus of the electrical storage means of the vehicle which concerns on this invention. It is a figure which shows the flowchart of the control method of an electric power supply apparatus. FIG. 3 is a diagram showing a continuation of the flowchart shown in FIG. 2. It is a figure which shows the state which is supplying electric power from a battery in an electric power supply apparatus. It is a figure which shows the state which is supplying electric power from a battery and a DCDC converter in an electric power supply apparatus. It is a figure which shows the state which is supplying electric power from a DCDC converter in an electric power supply apparatus.

Explanation of symbols

1 power supply device (vehicle power supply device),
1α power supply circuit section,
A circuit part controlled by a 1β switch drive circuit;
1a, 1b battery (multiple storage means),
2 charging resistance,
3 DCDC converter (power converter),
4 battery (auxiliary power supply),
5 Current sensor (current measuring means),
6a controller (control means),
6b Switch drive circuit (switch drive means),
SW1-5 switch (second switch means),
SW6 conductor switch (first switch means),
SW7 relay switch (third switch means),
7 Inverter,
8 Motor (vehicle drive motor),
9 Transmission,
10 differential gear,
11, 12 wheels,
13 Ignition key,
14 Voltage measuring instrument.

Claims (9)

A plurality of power storage means for supplying power to an inverter connected to the vehicle drive motor;
A first switch means disposed in a circuit for supplying power from the plurality of power storage means to the inverter, and shuts off the power supply from the plurality of power storage means to the inverter when an ignition key is turned off; ,
A second switch means disposed in a circuit for connecting the plurality of power storage means in parallel, and self-adjusting the capacity of each of the plurality of power storage means by connecting the plurality of power storage means in parallel;
An auxiliary power supply for supplying power to the auxiliary equipment mounted on the vehicle;
A power converter that converts and outputs power of the plurality of power storage means connected in parallel by the second switch means;
Switch driving means for driving the second switch means and the power converter by supplying power from the auxiliary power source and / or the power converter;
When the operation of the switch driving means is controlled, the ignition key is turned off, and the supply of power from the plurality of power storage means to the vehicle driving motor is interrupted by the first switch means, the auxiliary machine Control means for driving the second switch means in parallel by driving the second switch means by supplying power from a power source and driving the second switch means by supplying power from the power converter. Power supply device having. The power supply device according to claim 1,
The control means activates the switch driving means and starts driving the power converter when a potential difference generated between the power storage means of the plurality of power storage means connected in parallel by the second switch means is larger than a predetermined value. A power supply device characterized by that. The power supply device according to claim 1,
Arranged in a circuit for supplying electric power from the auxiliary power supply to the switch driving means, the ignition key is turned off, and the electric power from the plurality of power storage means to the vehicle driving electric motor is turned off by the first switch means And third switch means for cutting off the supply of power from the auxiliary power source to the switch drive means when the supply of power is interrupted,
The control means supplies power from the power converter to the switch drive means before the third power storage means is turned off and power supply from the auxiliary power supply to the switch drive means is interrupted. The power supply device, wherein the power converter is driven so as to have power that can drive the switch driving means. The power supply device according to claim 1,
The control means includes
When stopping the driving of the second switch means, power supply from the power converter to the switch driving means is stopped, and the plurality of power storage means connected in parallel by the second switch means are connected. A power supply device that is released. The power supply device according to claim 4,
The control means terminates driving of the power converter when a potential difference generated between power storage means of the plurality of power storage means connected in parallel by the second switch means is equal to or less than a predetermined value. Feeding device. The power supply device according to claim 1,
When the plurality of power storage units are connected in parallel by the second switch unit, the control unit connects the plurality of power storage units so that a charging resistor is interposed therebetween. The power supply device according to claim 1,
The power converter is disposed on a circuit that connects output terminals of the plurality of power storage means and the first switch means via the second switch means. A control method for a vehicle power supply apparatus comprising: a plurality of power storage means for supplying power to an inverter connected to a vehicle drive motor; and a plurality of switch means for switching a connection state of the plurality of power storage means,
When the plurality of power storage means is in a disconnected state with the vehicle driving motor,
Driving the plurality of switch means by power supply from an external voltage source, connecting the plurality of power storage means in parallel,
A control method for a power supply apparatus, wherein the plurality of switch means are driven by power supply from the plurality of power storage means connected in parallel to control a connection state of the plurality of power storage means. In the control method of the power supply device according to claim 8,
Prior to the power supply cut-off operation from the external voltage source, the plurality of switch means is driven by power supply from the plurality of power storage means,
After the operation of shutting off the power supply from the external voltage source is finished, the power supply from the plurality of power storage units connected in parallel is stopped, and the connection of the plurality of power storage units connected in parallel is released. Control method.

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