JP2022039050A - Power feeding device - Google Patents

Abstract

To provide a power feeding device capable of simplifying its configuration.SOLUTION: A power feeding device 12 comprises a system terminal 20, a load terminal 22, an AC/DC conversion circuit 25, a power storage device for power supply 26, and a controller 29 for controlling the AC/DC conversion circuit. The AC/DC conversion circuit comprises: a primary side circuit 31; a transformer 32 that includes primary side winding 33 and secondary side winding 34; a secondary side circuit 40 that has first leg wiring 41, a first upper arm switching element 43, a first lower arm switching element 44, second leg wiring 42, a second upper arm switching element 45, and a second lower arm switching element 46; a first connection line 51 for connecting between the power storage device for power supply and the load terminal; a second connection line 52 for connecting between an intermediate tap 37 of the secondary side winding and the first connection line; a coil 53 on the second connection line; a first intermediate capacitor 54 connected with the secondary side circuit and the second connection line; and a second intermediate capacitor 55 connected with the secondary side circuit and the second connection line.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power feeding device.

Patent Document 1 describes a power conversion facility which is an example of a power feeding device connected to a grid power supply. This power conversion facility converts the power from the grid power source into DC power, and supplies the converted DC power to the power source, which is an example of a power storage device, or the main battery, which is an example of a load, via a converter. do. Power conversion equipment may supply power from a power source to a load via a converter.

International Publication No. 2012/127673

In the power supply device described in Patent Document 1, in order to supply power to the load by using the power storage device, a converter for the power supply power storage device and a converter for the load are required. Therefore, the configuration of the power feeding device is complicated.

An object of the present invention is to provide a power feeding device that can simplify the configuration.

The power supply device that solves the above problems is a system terminal used for connection with a system power supply that outputs system power, a load terminal used for connection with a load, and the system power input to the system terminal as DC power. The AC / DC conversion circuit comprises an AC / DC conversion circuit for converting to, a power storage device connected to the AC / DC conversion circuit, and a control unit for controlling the AC / DC conversion circuit. Includes a primary circuit connected to the system terminal, a primary winding connected to the primary circuit, and a secondary winding with first, second and intermediate taps. A transformer, a first leg wiring connected to the first end of the secondary winding, and a first upper arm switching element and a first lower arm switching element connected in series with each other by the first leg wiring. , The second leg wiring connected to the second end of the secondary winding, and the second upper arm switching element and the second lower arm switching element connected in series with each other by the second leg wiring. A first connection line connecting the power storage device and the load terminal so that the secondary side circuit, the power storage device, and the load are connected in series, the intermediate tap, and the first. A second connection line connecting the first connection line, a coil provided on the second connection line, a first intermediate capacitor connected to the secondary side circuit and the second connection line, and the secondary side. A power feeding device including a second intermediate capacitor connected to the circuit and the second connection line and connected in series with the first intermediate capacitor.

The load is connected in series with the power storage device by being connected to the load terminal. According to the above configuration, it is possible to supply power to the load by using the power storage device by controlling each switching element without providing the converter for the power storage device and the converter for the load. Therefore, the configuration of the power feeding device can be simplified.

The power feeding device may be a device for charging the target power storage device as the load.
According to the above configuration, the target power storage device can be charged by using the power storage device.
The power feeding device may include a power supply relay that disconnects the connection between the AC / DC conversion circuit and the power storage device.

According to the above configuration, by controlling each switching element in a state where the power relay is disconnected from the AC / DC conversion circuit and the power storage device, the system does not supply power to the power power storage device. The load can be powered using a power source.

The power feeding device may include a load relay that disconnects the connection between the AC / DC conversion circuit and the load terminal.
According to the above configuration, even when the load is connected to the load terminal, the connection between the AC / DC conversion circuit and the load is established by disconnecting the connection between the AC / DC conversion circuit and the load terminal by the load relay. Be disconnected. Therefore, by controlling each switching element, in a situation where the load is connected to the load terminal, the power storage device can be charged using the system power supply without supplying power to the load.

According to the present invention, the configuration of the power feeding device can be simplified.

A schematic showing a power supply system with a power supply.

Hereinafter, an embodiment of the power feeding device will be described with reference to the drawings. The power supply device of this embodiment is a device constituting a power supply system.
As shown in FIG. 1, the power supply system 10 includes a system power supply 11 and a power supply device 12. The power supply system 10 is a system for supplying electric power to the vehicle power storage device 14 provided in the vehicle 13.

The grid power supply 11 is, for example, a power supply that outputs three-phase grid power, but may be a power supply that outputs single-phase grid power. The maximum value of the grid power that can be supplied by the grid power supply 11 varies depending on the contents of the contract with the power company or the usage status of other power systems.

The vehicle power storage device 14 is, for example, a secondary battery, an electric double layer capacitor, or the like. In the present embodiment, the vehicle power storage device 14 is an example of a load and also an example of a target power storage device.
The load voltage Vr, which is the voltage of the vehicle power storage device 14, varies depending on the type of the vehicle power storage device 14, SOC, and the like. For example, the load voltage Vr differs depending on whether the vehicle power storage device 14 is a lithium ion battery or a lead storage battery. The load voltage Vr becomes higher as the SOC of the vehicle power storage device 14 becomes higher. The vehicle power storage device 14 is charged by inputting DC power having a voltage required for charging the vehicle power storage device 14. The voltage required to charge the vehicle power storage device 14 is higher than, for example, the load voltage Vr.

The power feeding device 12 is a device that supplies power to the load. In the present embodiment, the power feeding device 12 charges the target power storage device as a load.
The power supply device 12 includes a system terminal 20 used for connection with the system power supply 11. When the system power supply 11 is connected to the system terminal 20, system power is input to the power supply device 12.

In the present embodiment, the power feeding device 12 includes three system terminals 20 in order to correspond to the system power supply 11 that outputs three-phase system power. The power feeding device 12 includes two system terminals 20 when corresponding to the system power supply 11 that outputs single-phase system power.

The power feeding device 12 includes an inlet 21 used for connection with the vehicle 13. By connecting the vehicle 13 to the inlet 21, the power supply device 12 and the vehicle power storage device 14 are electrically connected.

The inlet 21 has a load terminal 22 used for connection with the vehicle power storage device 14. That is, the power feeding device 12 includes a load terminal 22. The load terminal 22 is a terminal for electrically connecting the power feeding device 12 and the vehicle power storage device 14.

The load terminal 22 includes a positive electrode load terminal 23 and a negative electrode load terminal 24. The positive electrode load terminal 23 is connected to the positive electrode terminal of the vehicle power storage device 14. The negative electrode load terminal 24 is connected to the negative electrode terminal of the vehicle power storage device 14. By connecting the positive electrode load terminal 23 and the negative electrode load terminal 24 to the vehicle power storage device 14, electric power can be exchanged between the power supply device 12 and the vehicle power storage device 14.

The power feeding device 12 includes an AC / DC conversion circuit 25 that converts the system power input to the system terminal 20 into DC power. The AC / DC conversion circuit 25 converts the system power into DC power, for example, by boosting and rectifying the system power. The AC / DC conversion circuit 25 will be described later.

The power supply device 12 includes a power storage device 26 connected to the AC / DC conversion circuit 25. The power storage device 26 is, for example, a secondary battery, an electric double layer capacitor, or the like. The power supply voltage Vp, which is the voltage of the power storage device 26, varies depending on the SOC of the power storage device 26. For example, the power supply voltage Vp becomes higher as the SOC of the power storage device 26 becomes higher. The power storage device 26 is charged by inputting DC power having a voltage required for charging the power storage device 26. The voltage required to charge the power storage device 26 is higher than, for example, the power supply voltage Vp.

In the present embodiment, the power storage device 26 and the vehicle power storage device 14 are the same type of power storage device, but different types of power storage devices may be used. In the present embodiment, the power storage device 26 and the vehicle power storage device 14 are lithium ion batteries having the same nominal voltage. Therefore, in the present embodiment, the power supply voltage Vp may be higher or lower than the load voltage Vr depending on the SOC of the vehicle power storage device 14 and the SOC of the power power storage device 26.

The power feeding device 12 includes a power supply voltage sensor 27 that detects the power supply voltage Vp, which is the voltage of the power storage device 26. The power supply voltage sensor 27 is connected in parallel with the power storage device 26.
The power feeding device 12 includes a load voltage sensor 28 that detects a load voltage Vr, which is the voltage of the vehicle power storage device 14. The load voltage sensor 28 is connected in parallel with the vehicle power storage device 14 connected to the load terminal 22.

The power feeding device 12 includes a control unit 29 that controls the AC / DC conversion circuit 25. The control unit 29 controls the power supply by the power supply device 12 by controlling the AC / DC conversion circuit 25. The control unit 29 is connected to the power supply voltage sensor 27 and the load voltage sensor 28, and acquires the power supply voltage Vp and the load voltage Vr.

The control unit 29 is α: one or more processors that execute various processes according to a computer program, β: one or more dedicated hardware such as an integrated circuit for a specific application that executes at least a part of the various processes. It is configured as a wear circuit or a circuit including γ: a combination thereof. The processor includes a CPU and a memory such as a RAM and a ROM, and the memory stores a program code or a command configured to cause the CPU to execute a process. Memory or computer readable media includes any medium accessible by a general purpose or dedicated computer.

Next, the AC / DC conversion circuit 25 will be described.
The AC / DC conversion circuit 25 has a primary circuit 31 connected to the system terminal 20. The primary side circuit 31 performs so-called AC / AC conversion in which the system power input from the system terminal 20 is converted into AC power. The primary circuit 31 is, for example, a matrix converter, but is not limited thereto. The primary circuit 31 is controlled by the control unit 29. The control unit 29 controls the power conversion by the primary circuit 31.

The AC / DC conversion circuit 25 has a transformer 32. The transformer 32 includes a primary winding 33 connected to the primary circuit 31 and a secondary winding 34. The secondary winding 34 has a first end 35, a second end 36, and an intermediate tap 37. The transformer 32 boosts the AC power converted by the primary circuit 31, for example.

The AC / DC conversion circuit 25 has a secondary circuit 40 connected to the secondary winding 34. The secondary side circuit 40 includes a first leg wiring 41, a second leg wiring 42, a first upper arm switching element 43, a first lower arm switching element 44, a second upper arm switching element 45, and a second. It has a lower arm switching element 46. The secondary circuit 40 of the present embodiment further includes an upper arm wiring 47 and a lower arm wiring 48.

The first leg wiring 41 is connected to the first end 35. The first leg wiring 41 connects the first upper arm switching element 43 and the first lower arm switching element 44 in series.
The second leg wiring 42 is connected to the second end 36. The second leg wiring 42 connects the second upper arm switching element 45 and the second lower arm switching element 46 in series.

Each switching element 43, 44, 45, 46 is, for example, a MOSFET and has a body diode. The switching elements 43, 44, 45, 46 are not limited to MOSFETs, and may be IGBTs. Each of the switching elements 43, 44, 45, 46 is controlled by the control unit 29. The control unit 29 controls the duty ratio of each switching element 43, 44, 45, 46.

The upper arm wiring 47 is connected to the first upper arm switching element 43, the second upper arm switching element 45, and the power storage device 26. Specifically, the upper arm wiring 47 is connected to the positive electrode terminal of the power storage device 26.

The lower arm wiring 48 is connected to the first lower arm switching element 44, the second lower arm switching element 46, and the load terminal 22. Specifically, the lower arm wiring 48 is connected to the negative electrode load terminal 24 of the load terminal 22.

The AC / DC conversion circuit 25 has a first connection line 51 for connecting the power storage device 26 and the load terminal 22 so that the power storage device 26 and the vehicle power storage device 14 are connected in series. Specifically, the first connection line 51 is connected to the negative electrode terminal of the power storage device 26 and the positive electrode load terminal 23 of the load terminal 22.

The AC / DC conversion circuit 25 has a second connection line 52 that connects the intermediate tap 37 and the first connection line 51.
The AC / DC conversion circuit 25 has a coil 53 provided on the second connection line 52.

The AC / DC conversion circuit 25 has a first intermediate capacitor 54 connected to the secondary circuit 40 and the second connection line 52. Specifically, the first intermediate capacitor 54 is connected to the upper arm wiring 47 and the second connection line 52. The first intermediate capacitor 54 is connected to the second connection line 52 between the connection point between the first connection line 51 and the second connection line 52 and the coil 53.

The DC power of the voltage required for charging the power storage device 26 is input to the first intermediate capacitor 54. In this case, the noise included in the DC power is reduced by the first intermediate capacitor 54, and the voltage is stabilized. That is, the first intermediate capacitor 54 is a capacitor for maintaining the voltage required for charging the power storage device 26, and is a capacitor that suppresses fluctuation of the output voltage from the AC / DC conversion circuit 25. be.

The AC / DC conversion circuit 25 has a second intermediate capacitor 55 connected to the secondary circuit 40 and the second connection line 52. Specifically, the second intermediate capacitor 55 is connected to the lower arm wiring 48 and the second connection line 52. The second intermediate capacitor 55 is connected to the second connection line 52 between the connection point between the first connection line 51 and the second connection line 52 and the coil 53. The second intermediate capacitor 55 is connected in series with the first intermediate capacitor 54.

The DC power of the voltage required for charging the vehicle power storage device 14 is input to the second intermediate capacitor 55. In this case, the second intermediate capacitor 55 reduces the noise included in the DC power and stabilizes the voltage. That is, the second intermediate capacitor 55 is a capacitor for maintaining the voltage required for charging the vehicle power storage device 14, and is a capacitor that suppresses fluctuation of the output voltage from the AC / DC conversion circuit 25. be.

When the power storage device 26 and the vehicle power storage device 14 are regarded as one power storage device, and the first intermediate capacitor 54 and the second intermediate capacitor 55 are regarded as one intermediate capacitor, the first intermediate capacitor 54 and the second intermediate capacitor 54 are regarded as one intermediate capacitor. The DC power required for simultaneously charging the power storage device 26 and the vehicle power storage device 14 is input to the capacitor 55. In this case, the noise included in the DC power is reduced by the first intermediate capacitor 54 and the second intermediate capacitor 55, and the voltage thereof is stabilized. The first intermediate capacitor 54 and the second intermediate capacitor 55 are capacitors for maintaining the voltage required for simultaneously charging the power storage device 26 and the vehicle power storage device 14, and are AC / DC conversion circuits 25. It can be said that it is a capacitor for suppressing the fluctuation of the output voltage from.

The voltage required to charge the power storage device 26 and the vehicle power storage device 14 at the same time is necessary to charge the series connection body in which the power power storage device 26 and the vehicle power storage device 14 are connected in series. Voltage. The voltage required to charge the series connection is higher than the voltage of the series connection. The voltage of the series connection body is the sum of the power supply voltage Vp and the load voltage Vr. Therefore, in the present embodiment, the voltage of the series connection body is referred to as a total voltage Vm. The total voltage Vm is a voltage higher than the power supply voltage Vp and higher than the load voltage Vr.

By controlling the switching elements 43, 44, 45, 46, the AC / DC conversion circuit 25 outputs DC power of the voltage required for charging the power storage device 26, or charges the vehicle power storage device 14. It outputs the DC power of the voltage required for charging, or outputs the DC power of the voltage required for charging the series connection.

Next, the operation of the power feeding device 12 will be described while paying attention to the secondary circuit 40.
By controlling each of the switching elements 43, 44, 45, 46, the control unit 29 supplies power to the power storage device 26, supplies power to the vehicle power storage device 14, or supplies both of them. The control unit 29 performs power conversion by controlling the duty ratios of the switching elements 43, 44, 45, 46.

First, consider the case where the vehicle power storage device 14 is not connected to the load terminal 22.
The control unit 29 can charge the power storage device 26 using the system power supply 11 by controlling the switching elements 43, 44, 45, 46. For example, the control unit 29 alternately turns on the first upper arm switching element 43 and the second upper arm switching element 45 in a state where the first lower arm switching element 44 and the second lower arm switching element 46 are turned off. By turning it on / off, the system power is converted into DC power having a voltage required for charging the power storage device 26, and the DC power is output to the power power storage device 26. As a result, the power storage device 26 is charged. In this case, the control unit 29 drives the upper arm of the secondary circuit 40.

Next, consider the case where the vehicle power storage device 14 is connected to the load terminal 22.
By controlling the switching elements 43, 44, 45, 46, the control unit 29 can charge the vehicle power storage device 14 by using the power power storage device 26. For example, the control unit 29 stores the DC power of the power supply voltage Vp for the vehicle by alternately turning the upper arm switching elements 43 and 45 on and off while the lower arm switching elements 44 and 46 are turned off. The DC power of the voltage required for charging the device 14 is converted, and the DC power is output to the vehicle power storage device 14. As a result, the vehicle power storage device 14 is charged. In this case, the portion of the secondary winding 34 between the first end 35 and the intermediate tap 37 and the portion of the secondary winding 34 between the second end 36 and the intermediate tap 37 are , Functions as a coil connected in series with the coil 53. The control unit 29 drives the upper arm of the secondary circuit 40.

By controlling the switching elements 43, 44, 45, 46, the control unit 29 can simultaneously charge both the power storage device 26 and the vehicle power storage device 14 using the system power supply 11. The control unit 29 regards the power storage device 26 and the vehicle power storage device 14 as one power storage device, that is, a series connection between the power power storage device 26 and the vehicle power storage device 14, and charges the vehicle. For example, the control unit 29 alternately turns on / off the first upper arm switching element 43 and the second lower arm switching element 46, and the first lower arm switching element 44 and the second upper arm switching element 45. The system power is converted into DC power having a voltage required for charging the series connection body of the power storage device 26 and the vehicle power storage device 14, and the DC power is output to the series connection body. As a result, the power storage device 26 and the vehicle power storage device 14 are charged at the same time. In this case, the control unit 29 drives the upper arm and the lower arm of the secondary circuit 40.

In the present embodiment, the power storage device 26 and the vehicle power storage device 14 are the same type of batteries having the same nominal voltage. Therefore, after matching the power supply voltage Vp, which is the voltage of the power storage device 26, with the load voltage Vr, which is the voltage of the vehicle power storage device 14, both the power storage device 26 and the vehicle power storage device 14 are simultaneously used. When charged, the conversion efficiency of the power feeding device 12 is good. In the present embodiment, when the power supply voltage Vp and the load voltage Vr match, the total voltage Vm is a voltage that is approximately twice the power supply voltage Vp and is a voltage that is approximately twice the load voltage Vr.

In the present embodiment, when the power supply voltage Vp, which is the voltage of the power storage device 26, is higher than the load voltage Vr, which is the voltage of the vehicle power storage device 14, the control unit 29 first uses the power storage device 26. The vehicle power storage device 14 is charged. In this case, it can be said that the step-down circuit is composed of the upper arm switching elements 43 and 45, the coil 53, and the second intermediate capacitor 55. After that, when the power supply voltage Vp and the load voltage Vr match, the control unit 29 simultaneously charges the power storage device 26 and the vehicle power storage device 14 using the system power supply 11. In this case, the control unit 29 drives the upper arm and the lower arm of the secondary circuit 40 after driving the upper arm.

In the present embodiment, when the power supply voltage Vp, which is the voltage of the power storage device 26, is lower than the load voltage Vr, which is the voltage of the vehicle power storage device 14, the control unit 29 uses the system power supply 11 to power the power storage device. The 26 and the vehicle power storage device 14 are charged at the same time. In this case, the control unit 29 drives the upper arm and the lower arm of the secondary circuit 40.

Next, the actions and effects of the above-described embodiments will be described.
(1) According to the power supply device 12 of the present embodiment, the vehicle power storage device 14, which is a load, is connected in series with the power power storage device 26 by being connected to the load terminal 22. The power supply device 12 uses the power storage device 26 to store electricity for a vehicle by controlling the switching elements 43, 44, 45, 46 without providing a converter for the power storage device and a converter for the load. Power can be supplied to the device 14. Specifically, for example, the control unit 29 has the first upper arm switching element 43 and the second upper arm switching element 45 in a state where the first lower arm switching element 44 and the second lower arm switching element 46 are turned off. By alternately turning ON / OFF, the power storage device 26 can be used to supply power to the vehicle power storage device 14. Therefore, the configuration of the power feeding device 12 can be simplified. Further, since the power storage device 26 can be used to supply power to the vehicle power storage device 14 without going through the converter, no loss due to the power conversion of the converter occurs. Therefore, the conversion efficiency is improved.

(2) The power supply device 12 is a device for charging the vehicle power storage device 14, which is an example of the target power storage device as a load. According to this, the vehicle power storage device 14 can be charged by using the power power storage device 26. That is, the power feeding device 12 of the present embodiment can be suitably adopted as a power feeding device for a vehicle.

This embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
○ As shown in FIG. 1, the power supply device 12 may include a power supply relay 61 that disconnects the connection between the AC / DC conversion circuit 25 and the power storage device 26. The power relay 61 is provided on, for example, the first connection line 51, but the present invention is not limited to this. In this modification, the power relay 61 is provided on the first connection line 51 between the connection point between the first connection line 51 and the second connection line 52 and the negative electrode terminal of the power storage device 26. .. The power relay 61 is turned ON / OFF by being controlled by the control unit 29.

The control unit 29 disconnects the AC / DC conversion circuit 25 from the power storage device 26 by the power supply relay 61, so that the power storage device 26 is not charged and the system power supply 11 is used for the vehicle. The power storage device 14 can be charged. For example, the control unit 29 alternately turns on the first lower arm switching element 44 and the second lower arm switching element 46 in a state where the first upper arm switching element 43 and the second upper arm switching element 45 are turned off. By turning it on / off, the system power is converted into DC power having a voltage required for charging the vehicle power storage device 14, and the DC power is output to the vehicle power storage device 14. In this case, the control unit 29 drives the lower arm of the secondary circuit 40. As a result, the vehicle power storage device 14 is charged.

For example, the control unit 29 turns the switching elements 43, 44, 45, 46 on / off in the same manner as in the case of simultaneously charging the power storage device 26 and the vehicle power storage device 14, thereby supplying the system power for the vehicle. The voltage required for charging the power storage device 14 is converted into DC power, and the DC power is output to the vehicle power storage device 14. In this case, the voltage between the first end 35 and the second end 36 becomes the voltage required for charging the series connection, the voltage between the first end 35 and the intermediate tap 37, and the second end 36. The voltage between and the intermediate tap 37 is half the voltage required to charge the series connector. As a result, the vehicle power storage device 14 is charged.

According to this modification, the following effects can be obtained.
(3) The power storage device 26 is controlled by controlling the switching elements 43, 44, 45, 46 with the power relay 61 disconnected from the AC / DC conversion circuit 25 and the power storage device 26. Can be supplied to the vehicle power storage device 14 by using the system power supply 11 without charging.

○ As shown in FIG. 1, the power feeding device 12 may include a load relay 62 that disconnects the AC / DC conversion circuit 25 from the load terminal 22. The load relay 62 is provided on, for example, the first connection line 51, but the load relay 62 is not limited to this. In this modification, the load relay 62 is provided on the first connection line 51 between the connection point between the first connection line 51 and the second connection line 52 and the positive electrode load terminal 23 of the load terminal 22. .. The load relay 62 is turned ON / OFF by being controlled by the control unit 29.

The control unit 29 disconnects the AC / DC conversion circuit 25 from the load terminal 22 by the load relay 62, so that the system power supply 11 can be connected to the load terminal 22 even when the vehicle power storage device 14 is connected. It can be used to charge the power storage device 26. In the power feeding device 12, the state in which the load relay 62 disconnects the AC / DC conversion circuit 25 and the load terminal 22 is the same as the state in which the load is not connected to the load terminal 22. Therefore, the control unit 29 controls the switching elements 43, 44, 45, 46 in the same manner as when the vehicle power storage device 14 is not connected to the load terminal 22, so that the power storage is stored using the system power supply 11. The device 26 can be charged.

In this modification, even when the power supply voltage Vp is lower than the load voltage Vr, the power supply voltage Vp and the load voltage Vr can be matched by charging the power storage device 26 using the system power supply 11. Therefore, even when the power supply voltage Vp is lower than the load voltage Vr, the power storage device 26 and the vehicle power storage device 14 can be charged at the same time after the power supply voltage Vp and the load voltage Vr are matched.

According to this modification, the following effects can be obtained.
(4) Even when the vehicle power storage device 14 which is a load is connected to the load terminal 22, the AC / DC by disconnecting the connection between the AC / DC conversion circuit 25 and the load terminal 22 by the load relay 62. The connection between the conversion circuit 25 and the vehicle power storage device 14 is disconnected. Therefore, by controlling each of the switching elements 43, 44, 45, 46, the power storage device 26 can be selectively charged by using the system power supply 11 without supplying power to the vehicle power storage device 14.

〇 The target power storage device is not limited to the vehicle power storage device 14. The load terminal 22 is not limited to the vehicle power storage device 14 mounted on the vehicle 13, and other power storage devices may be connected to the load terminal 22.
〇 The load is not limited to the power storage device. The load terminal 22 is not limited to the power storage device, and an element that requires electric power as a load may be connected.

The technical ideas and their actions and effects grasped from the above-described embodiments and modifications are described below.
(A) The control unit has the first upper arm switching element and the second upper arm in a state where the first lower arm switching element and the second lower arm switching element are turned off when the load is not connected to the load terminal. The arm switching element is turned on / off alternately. According to this, it is possible to supply power to the power storage device using the system power supply.

(B) The control unit connects the first upper arm switching element and the second lower arm switching element, and the first lower arm switching element and the second upper arm switching element when the load is connected to the load terminal. Turn it on and off alternately. According to this, it is possible to supply power to the power storage device and the load at the same time by using the system power supply.

(C) The control unit has the first upper arm switching element and the second upper arm in a state where the first lower arm switching element and the second lower arm switching element are turned off when the load is connected to the load terminal. The arm switching element is turned on / off alternately. According to this, the load can be supplied by using the power storage device.

10 ... power supply system, 11 ... system power supply, 12 ... power supply device, 13 ... vehicle, 14 ... example of load and vehicle power storage device which is an example of target power storage device, 20 ... system terminal, 21 ... inlet, 22 ... load terminal , 23 ... Positive load terminal, 24 ... Negative load terminal, 25 ... AC / DC conversion circuit, 26 ... Power storage device, 27 ... Power supply voltage sensor, 28 ... Load voltage sensor, 29 ... Control unit, 31 ... Primary side Circuit, 32 ... transformer, 33 ... primary winding, 34 ... secondary winding, 35 ... first end, 36 ... second end, 37 ... intermediate tap, 40 ... secondary circuit, 41 ... first Leg wiring, 42 ... 2nd leg wiring, 43 ... switching element, 43 ... first upper arm switching element, 44 ... switching element, 44 ... first lower arm switching element, 45 ... switching element, 45 ... second upper arm switching Element, 46 ... switching element, 46 ... second lower arm switching element, 47 ... upper arm wiring, 48 ... lower arm wiring, 51 ... first connection line, 52 ... second connection line, 53 ... coil, 54 ... first Intermediate capacitor, 55 ... 2nd intermediate capacitor, 61 ... power supply relay, 62 ... load relay.

Claims (4)

The grid terminals used to connect to the grid power supply that outputs grid power,
The load terminal used to connect to the load,
An AC / DC conversion circuit that converts the system power input to the system terminal into DC power, and
A power storage device connected to the AC / DC conversion circuit,
A control unit that controls the AC / DC conversion circuit,
Equipped with
The AC / DC conversion circuit is
The primary circuit connected to the system terminal and
A transformer comprising a primary winding connected to the primary circuit and a secondary winding having a first end, a second end and an intermediate tap.
The first leg wiring connected to the first end of the secondary winding, the first upper arm switching element and the first lower arm switching element connected in series with each other by the first leg wiring, and the above 2 A secondary having a second leg wiring connected to the second end of the next winding and a second upper arm switching element and a second lower arm switching element connected in series with each other by the second leg wiring. Side circuit and
A first connection line connecting the power storage device and the load terminal so that the power storage device and the load are connected in series,
A second connecting line connecting the intermediate tap and the first connecting line,
The coil provided on the second connecting line and
The first intermediate capacitor connected to the secondary circuit and the second connection line,
A second intermediate capacitor connected to the secondary circuit and the second connection line and connected in series with the first intermediate capacitor,
Power supply device with. The power supply device according to claim 1, wherein the power supply device is a device for charging the target power storage device as the load. The power supply device according to claim 1 or 2, further comprising a power supply relay for disconnecting the connection between the AC / DC conversion circuit and the power storage device. The power supply device according to any one of claims 1 to 3, further comprising a load relay for disconnecting the connection between the AC / DC conversion circuit and the load terminal.

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