JP2015208146A - Power supply switching system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply switching system capable of extending an operable time of electrical equipment when operating the electrical equipment by supplying a power from a battery at interruption of service, and of saving labor for maintenance, while suppressing increase in size of the electrical equipment and increase in system cost.SOLUTION: A power supply relay 30a has a power supply controller 32a that, when a battery 51 is connected with a battery connector 35 and a heat source machine 1 is connected with an equipment connector 34, operates an inverter 33 to supply an AC power to the heat source machine 1, and keeps the AC power to a first AC power whose degree of difference from a commercial power supply is a predetermined level or more from a time point when the supply of the AC power is started to the time point when at least a predetermined time elapses. A supply power source identification part 12 of the heat source machine 1, when the supply of the AC power is started, determines whether or not the AC power is the first AC power to identify whether a supply source of the AC power is the commercial power supply or the power supply relay 30a.

Description

  The present invention relates to a power supply switching system that switches between a commercial power supply and a battery power supply to operate an electric device.

  Conventionally, in a hot water supply system that operates with electric power supplied from a commercial power source, a battery is built in so that it can be used even when a power failure occurs. A configuration that is operated by electric power has been proposed (see, for example, Patent Document 1).

  In the hot water supply apparatus described in Patent Document 1, when operating with power supplied from a battery, operating conditions are limited so as to suppress power consumption compared to when operating with power supplied from a commercial power source. Thus, the hot water can be supplied for a long time.

JP 2013-36652 A

  In the case of incorporating a large-capacity battery in preparation for a power failure in an electric device that is assumed to be operated by electric power supplied from a commercial power source like the hot water supply device described in Patent Document 1, the battery is accommodated. In order to secure the space, the size of the electric device is increased, the cost of the electric device is increased, and the battery maintenance by a service person or the like is required. And it is rare for a power outage to occur, and since it is unlikely that a power outage will last for a long time, it is realistic to adopt an electric device with a large capacity battery tolerate such inconvenience. is not.

  The present invention has been made in view of such a background, and a power supply switching system capable of extending the operable time of an electrical device when the electrical device is operated by power supply from a battery at the time of a power failure is provided for the electrical device. The object is to provide an image with increased size and reduced system cost.

The present invention has been made to achieve the above object, and the power switching system of the present invention includes:
A battery connection for connecting to the battery;
An equipment connection for connecting to electrical equipment;
DC power supplied from a battery connected to the battery connection unit, an inverter that converts the DC power into AC power and outputs the AC power to the device connection unit,
When a battery is connected to the battery connection unit and an electric device is connected to the device connection unit, the inverter is operated to supply AC power from the device connection unit to the electric device. A power supply repeater having a power supply control unit that uses the AC power as a first AC power whose degree of difference from the commercial power source is equal to or higher than a predetermined level until at least a predetermined time elapses after the start of supply When,
Operated by supplying AC power,
When the supply of AC power is started, it is determined whether or not the AC power is the first AC power, and whether the AC power supply source is the power supply repeater or the commercial power supply is identified. A power supply identification unit
When the supply source of AC power is identified as a commercial power source by the supply power source identification unit, operation in the first mode is performed, and the supply source of AC power is the power repeater by the supply power source identification unit. When it is identified, the electric apparatus includes an operation mode switching unit that performs an operation in the second mode that consumes less power than the first mode.

  According to the present invention, when a commercial power failure occurs, a user prepares the power repeater and uses a general-purpose battery (for example, a battery for an automobile) as the battery of the power repeater. By connecting to the connection unit and connecting the electrical device to the device connection unit of the power relay, it is possible to supply AC power from the power relay to the electrical device to operate the electrical device Become.

  And when the said power supply repeater starts supply of the alternating current power to the said electric equipment, it will output the said 1st alternating current power until the said predetermined time passes at least. In addition, when the power supply identification unit determines the supply of the first AC power and recognizes that the supply source of the AC power is the power supply repeater, the electrical device has the second mode with less power consumption. So that the available drive time is longer.

  Thus, according to the present invention, since it is not necessary to provide a battery in the electrical device, the size and cost of the electrical device are not increased. As the battery, a general-purpose product such as an automobile battery can be used, and the power supply repeater can also be connected to various electric devices for general use to supply AC power. Can be expected to go down. Therefore, cost can be suppressed also as the whole power supply switching system. In addition, it is possible to eliminate the need for a service for battery maintenance that is required when the electric device is provided with a battery.

  In addition, after the predetermined time has elapsed, the power supply control unit switches the AC power output from the device connection unit to a second AC power having a degree of difference from a commercial power source smaller than that of the first AC power. It is characterized by that.

  According to this configuration, after the predetermined time has elapsed by the power supply control unit, the AC power supplied from the device connection unit to the electrical device has a degree of difference from the AC power output from a commercial power source. By switching to the small second AC power, the electric device can be operated more stably.

The power repeater includes a commercial power connection for connecting to a commercial power source,
A power failure detection unit that detects a commercial power failure,
An output power switching unit that selects one of commercial power supplied from a commercial power source via the commercial power source connection unit and AC power output from the inverter and outputs the selected power from the device connection unit; ,
When the commercial power supply is not detected by the power failure detection unit, the power supply control unit is configured such that the commercial power supplied from the commercial power source via the commercial power supply connection unit by the output power switching unit is the power supply control unit. When a power failure of the commercial power source is detected by the power failure detection unit, the inverter is activated and the AC power output from the inverter by the output power switching unit is the power output from the device connection unit. It is characterized by being in a state of being output from the device connection unit.

  According to this configuration, the user can connect a commercial power supply to the commercial power supply connection portion of the power supply repeater, and connect an electric device to the commercial power supply via the power supply repeater. When this occurs, DC power output from the battery is converted into AC power by the inverter and supplied to the electrical equipment by the power repeater. Therefore, the user does not need to switch the connection destination of the electrical device from a commercial power source to the power repeater. After that, when the commercial power supply is restored, the power repeater switches to a state where the AC power of the commercial power supply is output, so that the user does not need to switch the connection destination of the electric device to the commercial power supply. .

The output power switching unit has a function of cutting off both the supply of AC power from the inverter to the device connection unit and the supply of commercial power from the commercial power supply connection unit to the device connection unit,
When the power supply control unit is switched from a state where a power failure of the commercial power source is detected by the power failure detection unit to a state where the power supply control unit is not detected, the output power switching unit switches the AC from the inverter to the device connection unit. After both the supply of power and the supply of commercial power from the commercial power supply connection unit to the device connection unit are cut off, the commercial power supplied from the commercial power supply via the commercial power supply connection unit is output from the device connection unit It is characterized by being in a state to be performed.

  According to this configuration, the AC power from the inverter to the device connection unit is switched by the output power switching unit when the power failure detection unit switches from a state where a power failure of the commercial power source is detected to a state where it is not detected. When the supply of commercial power from a commercial power source is resumed by shutting off both the supply of commercial power and the commercial power supply from the commercial power supply connection unit to the device connection unit, It can start stably.

The block diagram of 1st Embodiment of the power supply switching system of this invention. The operation | movement flowchart of the power supply repeater shown in FIG. The operation | movement flowchart of the heat-source machine shown in FIG. The block diagram of 2nd Embodiment of the power supply switching system of this invention. The operation | movement flowchart of the power supply repeater shown in FIG.

  An embodiment of the present invention will be described with reference to FIGS.

[First Embodiment]
First, a first embodiment will be described with reference to FIGS. With reference to FIG. 1, the power supply switching system of 1st Embodiment is comprised by the heat source machine 1 and the power supply repeater 30a.

  The heat source unit 1 (corresponding to the electric device of the present invention), for example, has a hot water supply function for heating water supplied from a water supply to a set temperature and supplying it to a bathroom or kitchen, and water stored in a bathtub in the bathroom. It is a combined type hot water supply device having a reheating function for heating and a hot water heating function for circulating hot water to a hot water terminal (floor heater, hot water hot air heater, etc.).

  The heat source machine 1 has a specification that operates with AC power (for example, AC power of AC 100 V) supplied from a commercial power source. Therefore, in a normal time when no power failure occurs in the commercial power supply, the power plug 25 is connected to the commercial power outlet 40 and is operated by the AC power supplied from the commercial power supply.

  The heat source device 1 includes a power supply circuit 20 that converts AC power supplied from the power plug 25 into DC power (for example, DC power of 12 V DC), and a controller 10 that is operated by the DC power output from the power supply circuit 20. Yes.

  The controller 10 is an electronic circuit unit including a CPU, a memory, various interface circuits, etc. (not shown), and controls the operation of the heat source unit 1 by executing a control program for the heat source unit 1 held in the memory by the CPU. And it functions as the operation mode switching part 11 and the power supply identification part 12 of this invention.

  The power repeater 30a is used when a commercial power failure occurs. The power connection unit 34 connected to the power plug 25 of the heat source unit 1, the battery connection unit 35 connected to the battery 51, the power source DC power (for example, DC 12V DC power) supplied from the switch 31 for switching the relay device 30a between the operation state and the stop state, the battery 51 via the battery connection unit 35, for example, AC power (hereinafter referred to as DC power) And an electric power supply control unit 32a for setting the specification of the AC power output from the inverter 33. .

  In the present embodiment, an example is shown in which the battery connection portion 35 of the power repeater 30a is connected to the battery 51 (corresponding to the battery of the present invention) of the automobile 50.

  Hereinafter, according to the flowchart shown in FIG.2 and FIG.3, the action | operation of the power repeater 30a and the heat-source equipment 1 is demonstrated. When a power failure occurs in the commercial power source and the heat source unit 1 cannot be used, the user changes the power plug 25 of the heat source unit 1 from the commercial power outlet 40 to the device connection unit 34 of the power repeater 30a. .

  Further, the user connects the battery connection part 35 of the power relay 30 a and the cigar socket (not shown) of the automobile 50 by the battery cable 55, and the battery 51 of the automobile 50 is connected to the battery connection part 35. State. Then, the user turns on the switch 31 to activate the power repeater 30a.

  FIG. 2 is a flowchart of the power repeater 30a. The power repeater 30a proceeds to STEP2 when the switch 31 is turned on in STEP1. STEP2 to STEP7 are processes by the power supply control unit 32a.

  In STEP 2, the power supply control unit 32a starts outputting the first AC power whose degree of difference from the commercial power is equal to or higher than a predetermined level. Here, the degree of difference is, for example, the degree of difference in voltage level, frequency, etc., and the predetermined level is set so that the heat source unit 1 can normally operate and can be distinguished from commercial power.

  In subsequent STEP 3, the power supply control unit 32 a starts the timer, waits for the timer to time up in the next STEP 4, and proceeds to STEP 5. Here, the set time of the timer (corresponding to the predetermined time of the present invention) is such that the output of the first AC power is stable, and the first AC power and the commercial power can be distinguished by the processing of the heat source unit 1 described later. It is set to become time.

  In STEP 5, the power supply control unit 32a switches the AC power output from the inverter 33 from the first AC power to the second AC power. The degree of difference between the second AC power and the commercial power is set to be smaller than that of the first AC power, so that the heat source unit 1 operates more stably during a power failure.

  In subsequent STEP 6, when the switch 31 is turned OFF, the process proceeds to STEP 7. The power supply control unit 32a stops the operation of the inverter 33, stops the output of the AC power from the device connection unit 34, and proceeds to STEP 8. Exit.

  Next, FIG. 3 is a flowchart of the controller 10 of the heat source device 1. The controller 10 is activated when the power plug 25 is connected to a power supply (commercial power supply or power supply repeater 30a) and supplied with AC power, and the supply of DC power from the power supply circuit 20 is started, as shown in FIG. The process according to the flowchart shown is executed.

  Steps 10 to 11 in FIG. 3 are processes performed by the power supply identification unit 12. The supply power identification unit 12 proceeds to STEP 11 when the supply of DC power from the power supply circuit 20 is started in STEP 10, and the AC power started to be supplied through the power plug 25 is changed to the first AC power (power relay 30 a The AC power supply source is identified by determining whether or not the AC power is the AC power output at the start of the supply of AC power from. Reference data (data such as voltage level and frequency indicating the degree of difference from commercial power) for determining whether or not the first AC power is stored in a memory in advance.

  When the supply power identification unit 12 identifies that the connection destination of the power plug 25 is a commercial power source in STEP 11, the process proceeds to STEP 12. STEP 12 is a process by the operation mode switching unit 11, and the operation mode switching unit 11 changes the operation mode of the heat source device 1 to the first mode (a normal operation mode in which operation conditions are not limited to suppress power consumption). Set. And it progresses to STEP13 and the controller 10 starts the driving | operation of the heat-source equipment 1 in a 1st mode.

  On the other hand, when the supply power identification unit 12 identifies that the connection destination of the power plug 25 is not a commercial power source (STEP 20a) in STEP 11, the process branches to STEP 20. In STEP 20, the operation mode switching unit 11 sets the operation mode of the heat source device 1 to the second mode (power saving operation mode for restricting operation conditions for suppressing power consumption), and proceeds to STEP 13.

  In addition, as a restriction | limiting of the driving | running condition in 2nd mode, the process of lowering the upper limit of the preset temperature in hot water supply driving | operation, prohibiting execution of a chasing operation, etc. is performed.

  As described above, according to the configuration of the first embodiment, when a power failure occurs in the commercial power supply, the user connects the connection destination of the power plug 25 of the heat source unit 1 from the commercial power outlet 40 to the power repeater. By switching to the device connection unit 34 of 30a, connecting the battery 51 to the battery connection unit 35 of the power repeater 30a, and turning on the switch 31, it can be operated with DC power supplied from the battery 51.

  In this case, since the heat source unit 1 is operated in the second mode in which power consumption is suppressed, the hot water supply possible time of the heat source unit 1 during the power failure period can be extended.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.

  The power supply switching system according to the second embodiment includes a heat source device 1 and a power supply repeater 30b. Since the configuration of the heat source device 1 is the same as that of the first embodiment described above, description thereof is omitted. Moreover, in the power repeater 30b, about the same structure as the power repeater 30a in 1st Embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The power repeater 30b includes, in addition to the battery connection unit 35, a commercial power connection unit 38 for connecting to a commercial power source, commercial power supplied from the commercial power source connection unit 38, and AC power (first power output from the inverter 33). Output power switching unit 36 that selects and outputs either one of (1 AC power or second AC power) and a power failure detection unit 37 that detects a power failure of the commercial power supply.

  The power repeater 30b operates with commercial power when commercial power is supplied from the commercial power connection 38, and operates with DC power supplied from the battery connection 35 when supply of commercial power is interrupted. . Note that the battery 60 connected to the battery connection unit 35 may be charged when commercial power is supplied from the commercial power supply connection unit 38.

  In the second embodiment, the user connects the battery 60 to the battery connection unit 35 of the power repeater 30b, and connects the plug 39 of the power cable 45 connected to the commercial power connection unit 38 to the commercial power outlet 40. The power source plug 25 of the heat source device 1 is connected to the device connection unit 34. Thereby, the heat source device 1 is connected to the battery 60 and the commercial power supply via the power relay 30b. Then, the user turns on the switch 31 and keeps the power repeater 30b activated.

  Hereinafter, the operation of the power repeater 30b will be described with reference to the flowchart shown in FIG. When the switch is turned on in STEP50, the process proceeds to STEP51. STEP51 to STEP58 and STEP70 are processes by the power supply control unit 32b.

  In STEP 51, the power supply control unit 32b determines whether or not a power failure has occurred in the commercial power supply by the power failure detection unit 37. When no commercial power failure occurs, the process branches to STEP 70, where the power supply control unit 32b outputs the commercial power supplied from the commercial power connection unit 38 to the device connection unit 34. To. Thereby, the heat source machine 1 operates with commercial power. Until the power failure of the commercial power source is detected in STEP 51, the state where the commercial power is supplied from the power repeater 30b to the heat source unit 1 is maintained.

  On the other hand, when a power failure of the commercial power source is detected by the power failure detection unit 37 in STEP 51, the process proceeds to STEP 52, where the power supply control unit 32 b switches the output power switching unit 36 to the AC power output from the inverter 33 and the device connection unit 34. Switch to the state to output to. Then, the power supply control unit 32 b operates the inverter 33 to output the first AC power from the device connection unit 34. Thereby, the heat source device 1 is operated by the electric power supplied from the battery 60.

  In subsequent STEP 53, the power supply control unit 32b starts a timer. Then, when the timer expires in the next STEP 54, the process proceeds to STEP 55, where the power supply control unit 32b sets the AC power output from the inverter 33 to the second power whose degree of difference from the commercial power is smaller than the first AC power. Switch to AC power.

  In the next STEP 56, the power supply control unit 32b determines whether or not a power failure of the commercial power source is detected by the power failure detection unit 37. If a power failure is detected, the process proceeds to STEP 57 and the switch 31 is turned off. It is judged whether it was done.

  When the switch 31 is turned OFF, the process proceeds to STEP 58, where the power supply control unit 32b stops outputting AC power from the device connection unit 34, proceeds to STEP 59, and ends the process.

  On the other hand, when a power failure of the commercial power source is not detected in STEP 56 (when power is restored), the process branches to STEP 70, and the power supply control unit 32b supplies the output power switching unit 36 to the commercial power supplied from the commercial power source connection unit 38. The power is set to be output to the device connection unit 34. Thereby, the heat source machine 1 is switched to the state which operate | moves with commercial power.

  Here, as shown in FIG. 4, the output power switching unit 36 includes a first position (position a in the figure) for connecting the device connecting unit 34 to the inverter 33, and a commercial power source connecting unit 38 for connecting the device connecting unit 34. The second position (position b in the figure) for connecting to the device and the third position (position n in the figure) for disconnecting the device connection section 34 from the inverter 33 and the commercial power supply connection section 38 are switched to three positions. 36a.

  The power supply control unit 32b branches from STEP 56 to STEP 70, and when the AC power output from the device connection unit 34 is switched from the second AC power to the commercial power, the contact 36a of the output power switching unit 36 is changed to the first power supply control unit 32b. The power supply to the device connection unit 34 is temporarily cut from the first position to the third position, and then switched to commercial power as the third position. Thereby, the reset IC provided in the controller 10 of the heat source device 1 can be reliably operated, and the CPU of the controller 10 can be started stably.

  If the switch 31 is not OFF in STEP 57, the process returns to STEP 56, and the power supply control unit 32b continues to output the second AC power to the device connection unit 34.

  According to the structure of 2nd Embodiment, when the power failure of a commercial power supply arises, the direct-current power supplied from the battery 60 is converted into alternating current power by the power supply repeater 30b, and is supplied to the heat source machine 1. FIG. Therefore, the user does not need to change the power plug 25 of the heat source unit 1 as in the configuration of the first embodiment.

  Further, when the commercial power source is restored, the power relay 30b returns the commercial power source from the commercial power source to the heat source unit 1. Therefore, the user does not need to change the power plug 25 of the heat source device 1 as in the configuration of the first embodiment.

  In the present embodiment, the heat source device 1 is shown as the electric device of the present invention, but the present invention can be applied to any electric device configured on the premise of operation by a commercial power source.

  Moreover, although the battery mounted in a motor vehicle was shown as a battery of this invention, another kind of battery can also be used.

  Further, in the present embodiment, the power supply control units 32a and 32b switch to the second AC power after outputting the first AC power for a predetermined time, but continue the output of the first AC power without performing this switching. May be.

  DESCRIPTION OF SYMBOLS 1 ... Heat source machine, 10 ... Controller, 11 ... Operation mode switching part, 12 ... Supply power identification part, 25 ... Power supply plug, 30a, 30b ... Power supply repeater, 32a, 32b ... Power supply control part, 33 ... Inverter, 34 ... device connection part, 35 ... battery connection part, 36 ... output power switching part, 37 ... power failure detection part, 38 ... commercial power supply connection part, 51, 60 ... battery (battery).

Claims (4)

A battery connection for connecting to the battery;
An equipment connection for connecting to electrical equipment;
DC power supplied from a battery connected to the battery connection unit, an inverter that converts the DC power into AC power and outputs the AC power to the device connection unit,
When a battery is connected to the battery connection unit and an electric device is connected to the device connection unit, the inverter is operated to supply AC power from the device connection unit to the electric device. A power supply repeater having a power supply control unit that uses the AC power as a first AC power whose degree of difference from the commercial power source is equal to or higher than a predetermined level until at least a predetermined time elapses after the start of supply When,
Operated by supplying AC power,
When the supply of AC power is started, it is determined whether or not the AC power is the first AC power, and whether the AC power supply source is the power supply repeater or the commercial power supply is identified. A power supply identification unit
When the supply source of AC power is identified as a commercial power source by the supply power source identification unit, operation in the first mode is performed, and the supply source of AC power is the power repeater by the supply power source identification unit. A power supply switching system comprising: an electrical device having an operation mode switching unit that performs operation in a second mode that consumes less power than the first mode when identified. In the power supply switching system according to claim 1,
After the predetermined time has elapsed, the power supply control unit switches the AC power output from the device connection unit to a second AC power whose degree of difference from a commercial power supply is smaller than the first AC power. A featured power switching system. In the power supply switching system according to claim 1 or 2,
The power repeater includes a commercial power connection for connecting to a commercial power source,
A power failure detection unit that detects a commercial power failure,
An output power switching unit that selects one of commercial power supplied from a commercial power source via the commercial power source connection unit and AC power output from the inverter and outputs the selected power from the device connection unit; ,
When the commercial power supply is not detected by the power failure detection unit, the power supply control unit is configured such that the commercial power supplied from the commercial power source via the commercial power supply connection unit by the output power switching unit is the power supply control unit. When a power failure of the commercial power source is detected by the power failure detection unit, the inverter is activated and the AC power output from the inverter by the output power switching unit is the power output from the device connection unit. A power supply switching system characterized by being in a state of being output from a device connection unit. In the power supply switching system according to claim 3,
The output power switching unit has a function of cutting off both the supply of AC power from the inverter to the device connection unit and the supply of commercial power from the commercial power supply connection unit to the device connection unit,
When the power supply control unit is switched from a state where a power failure of the commercial power source is detected by the power failure detection unit to a state where the power supply control unit is not detected, the output power switching unit switches the AC from the inverter to the device connection unit. After both the supply of power and the supply of commercial power from the commercial power supply connection unit to the device connection unit are cut off, the commercial power supplied from the commercial power supply via the commercial power supply connection unit is output from the device connection unit The power supply switching system characterized by being made into the state to be made.

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