JP2021175209A - Power system and power supply device - Google Patents

Abstract

To provide a power system and a power supply device capable of suitably supplying power to a load using a system power supply and a specific power supply.SOLUTION: A power system 10 includes a system power supply 11, a power supply power storage device 12 as a specific power supply different from the system power supply 11, a vehicle power storage device 21 as a load, a primary side circuit 80, a step-up circuit 90, and a step-down circuit 100. The power system 10 includes a control circuit 120 that controls the primary circuit 80, the step-up circuit 90, and the step-down circuit 100. The control circuit 120 has at least a system mode for supplying power to the vehicle power storage device 21 by using the system power supply 11, and a power supply mode for supplying power to the vehicle power storage device 21 by using the power supply power storage device 12 as a mode for supplying power to the vehicle power storage device 21.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power system and a power supply device.

For example, Patent Document 1 describes a power system in which a storage battery as a specific power source and a distributed power source are systematically connected to a power system as a system power source. In the power system, the power output from the storage battery and the distributed power source is converted into system power, output to the power system, and supplied to the load as system power.

JP-A-2019-68618

Here, in a power system having a system power supply and a specific power supply, it may be desired to change the power supply to be used according to various situations such as a system power supply usage status or a contract status. For example, if the grid power supply has sufficient power supply capacity, it may be desirable to use the grid power supply to supply power. For example, if the specific power supply has sufficient power supply capacity, it is not the grid power supply. There may be cases where you want to supply power using a specific power source.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power system and a power supply device capable of suitably supplying power to a load using a system power supply and a specific power supply. Is.

A power system that achieves the above object is a first two having a grid power supply, a specific power supply different from the grid power supply, a load, a first primary winding, and a midpoint tap to which the specific power supply is connected. A first transformer with a secondary winding, a second primary winding connected in series with the first primary winding, and a second with a midpoint tap to which the load is connected. A second transformer provided with two secondary windings is connected to the system power supply and is connected to a series connector of the first primary winding and the first secondary winding. A primary side circuit having a primary side switching element, a first secondary side coil provided between the midpoint tap of the first secondary side winding and the specific power supply, and the first secondary side coil. A first secondary side circuit having a first secondary side switching element connected to the secondary side winding, and the first secondary side circuit connected to the second secondary side circuit. A second secondary coil provided between the midpoint tap of the secondary winding and the load, and a second secondary switching element connected to the second secondary winding. An intermediate capacitor provided between the second secondary side circuit having the above, the first secondary side circuit, and the second secondary side circuit, the primary side circuit, and the first side circuit. A control unit for controlling the secondary side circuit and the second secondary side circuit is provided, and the control unit comprises the primary side switching element and the first side as a mode for supplying power to the load. A system mode in which power is supplied to the load by using at least the system power supply by periodically turning on / off the secondary side switching element and the second secondary side switching element, and the first 2 The power supply mode for supplying power to the load by using the specific power supply by periodically turning on / off at least one of the secondary side switching element and the second secondary side switching element is provided. In the power supply mode, the control unit is either the first secondary side switching element or the second secondary side switching element based on the magnitude relationship between the voltage of the specific power supply and the required voltage of the load. It is characterized by having a single control unit that periodically turns one on and off while keeping the other on or off.

According to this configuration, the control unit has a system mode and a power supply mode as modes for supplying power to the load, so that the system power supply or the system power supply and the specific power supply can be used depending on the situation. It is possible to supply electric power or to supply electric power using a specific power source. As a result, it is possible to suitably supply power to the load using the system power supply and the specific power supply.

Further, in the power supply mode, since control is performed by the single control unit, switching is performed as compared with a configuration in which both the first secondary side switching element and the second secondary side switching element are periodically turned on / off. The loss can be reduced.

With respect to the power system, the single control unit periodically turns on / off the first secondary switching element when the voltage of the specific power supply is lower than the required voltage of the load, while the first. It is preferable to maintain the secondary side switching element of No. 2 in the ON state or the OFF state.

According to this configuration, when the voltage of the specific power supply is lower than the required voltage of the load, the power of the specific power supply becomes the first 2 by periodically turning on / off the first secondary side switching element. It is boosted in the next circuit. As a result, it is possible to supply power to the load with a voltage closer to the required voltage of the load than the voltage of the specific power supply. In this case, since it is not necessary to step down the power output from the intermediate capacitor in the second secondary circuit, the second secondary switching element may be maintained in the ON state or the OFF state. Therefore, by maintaining the second secondary side switching element in the ON state or the OFF state, the switching loss of the second secondary side switching element can be reduced.

Regarding the power system, the second secondary circuit is a second secondary switching element connected to the first secondary circuit via the intermediate capacitor as the second secondary switching element. The upper arm switching element and the second secondary side lower arm switching element are provided, and the second secondary side upper arm switching element and the second secondary side lower arm switching element are the second secondary side lower arm switching element. They are connected to each other by a second secondary side connection line connected to the side winding, and the single control unit is connected to the first control unit when the voltage of the specific power supply is lower than the required voltage of the load. While the secondary side switching element is periodically turned ON / OFF, the second secondary side upper arm switching element is maintained in the ON state and the second secondary side lower arm switching element is maintained in the OFF state. It is preferable to perform the first single control.

According to such a configuration, the electric power boosted by the first secondary side circuit is input to the load through the second secondary side circuit. As a result, the power boosted by the first secondary circuit can be supplied to the load without forming a path that bypasses the second secondary circuit.

With respect to the power system, the single control unit periodically turns on / off the second secondary switching element when the voltage of the specific power supply is higher than the required voltage of the load, while the first. It is preferable to maintain the secondary side switching element of 1 in the ON state or the OFF state.

According to this configuration, when the voltage of the specific power supply is higher than the required voltage of the load, the first secondary side switching element is maintained in the ON state or the OFF state, so that the power of the specific power supply is boosted. It is input to the second secondary circuit without any problem. Then, by periodically turning on / off the second secondary side switching element, the electric power input to the second secondary side circuit is stepped down in the second secondary side circuit, and the step down is performed. Power is supplied to the load. As a result, it is possible to supply power to the load with a voltage closer to the required voltage of the load than the voltage of the specific power supply. In this case, since the first secondary side switching element is maintained in the ON state or the OFF state, the switching loss of the first secondary side switching element can be reduced.

Regarding the power system, the first secondary side circuit is a first secondary side circuit connected to the second secondary side circuit via the intermediate capacitor as the first secondary side switching element. The upper arm switching element and the first secondary side lower arm switching element are provided, and the first secondary side upper arm switching element and the first secondary side lower arm switching element are the first secondary side lower arm switching element. They are connected to each other by a first secondary side connection line connected to a side winding, and the single control unit is connected to the second control unit when the voltage of the specific power supply is higher than the required voltage of the load. While the secondary side switching element is periodically turned ON / OFF, the first secondary side upper arm switching element is maintained in the ON state and the first secondary side lower arm switching element is maintained in the OFF state. It is preferable to perform the second single control.

According to such a configuration, the electric power output from the specific power supply is input to the second secondary circuit through the first secondary circuit, stepped down by the second secondary circuit, and supplied to the load. Will be done. As a result, the power of the specific power source can be supplied to the load without forming a path that bypasses the first secondary circuit.

Regarding the power system, the specific power supply is a power storage device, the load is a vehicle power storage device, and the power system detects a voltage of the power storage device as the voltage of the specific power supply. A comparison unit including a sensor and a required voltage sensor that detects the voltage of the vehicle power storage device as the required voltage of the load, and the single control unit repeatedly compares the voltages of both power storage devices during the power supply mode. It is preferable to switch the switching mode of the first secondary side switching element and the second secondary side switching element based on the comparison result of the comparison unit.

According to this configuration, the vehicle power storage device is charged using the electric power stored in the power power storage device in the power supply mode. In this case, since the voltage of the power storage device and the voltage of the vehicle power storage device change as the SOCs of both power storage devices change, the magnitude relationship between the two can also change.

In this regard, according to this configuration, the voltage of the power storage device and the voltage of the vehicle power storage device are repeatedly compared during the power supply mode, and based on the comparison result, the switching mode of both secondary side switching elements. Is switched. As a result, the magnitude relationship between the voltage of the power storage device and the voltage of the vehicle power storage device changes during the power supply mode due to the charging of the vehicle power storage device using the power storage device. I can handle it.

The power supply device that achieves the above object supplies power to the load using a system power supply and a specific power supply different from the system power supply, and the first primary winding and the specific power supply are connected to each other. A first transformer with a first secondary winding having a midpoint tap, a second primary winding connected in series with the first primary winding, and said. A second transformer with a second secondary winding having a midpoint tap to which the load is connected, and the first primary winding and the first secondary that are connected to the grid power supply. A first circuit connected to a series connection of side windings and having a primary side switching element, and a first provided between the midpoint tap of the first secondary winding and the specific power supply. The first secondary side circuit having the secondary side coil of the above and the first secondary side switching element connected to the first secondary side winding, and the first secondary side circuit. It is connected to the second secondary coil provided between the midpoint tap of the second secondary winding and the load, and the second secondary winding. A second secondary circuit having a connected second secondary switching element, and an intermediate capacitor provided between the first secondary circuit and the second secondary circuit. A control unit that controls the primary side circuit, the first secondary side circuit, and the second secondary side circuit, and the control unit is used as a mode for supplying power to the load. By periodically turning on / off the primary side switching element, the first secondary side switching element, and the second secondary side switching element, at least the system power supply is used to supply power to the load. By periodically turning on / off at least one of the first secondary side switching element and the second secondary side switching element, the power to the load is supplied by using the specific power supply. The control unit includes the power supply mode for supplying, and in the power supply mode, the first secondary side switching element or the control unit is based on the magnitude relationship between the voltage of the specific power supply and the required voltage of the load. It is characterized by including a single control unit that periodically turns on / off one of the second secondary switching elements while maintaining the other in the ON state or the OFF state.

According to this configuration, the control unit has a system mode and a power supply mode as modes for supplying power to the load, so that the system power supply or the system power supply and the specific power supply can be used depending on the situation. It is possible to supply electric power or to supply electric power using a specific power source. As a result, it is possible to suitably supply power to the load using the system power supply and the specific power supply.

Further, in the power supply mode, since control is performed by the single control unit, switching is performed as compared with a configuration in which both the first secondary side switching element and the second secondary side switching element are periodically turned on / off. The loss can be reduced.

The power system that achieves the above object includes an AC / DC conversion circuit that converts the system power output from the system power supply into DC power, a specific power supply different from the system power supply, and a power conversion circuit connected to the specific power supply. A power conversion circuit connected to both the first conversion circuit having the first conversion switching element, the AC / DC conversion circuit, and the first conversion circuit, and having the second conversion switching element. The two conversion circuits, the load to which the power converted by the second conversion circuit is input, and the AC / DC conversion circuit and the second conversion circuit are provided and connected to the first conversion circuit. The control unit includes an intermediate capacitor, an AC / DC conversion circuit, a control unit that controls power by controlling the first conversion circuit and the second conversion circuit, and the control unit supplies power to the load. The mode includes at least a system mode in which power is supplied to the load using the system power supply and a power supply mode in which power is supplied to the load using the specific power supply. In the power supply mode, one of the first conversion switching element and the second conversion switching element is periodically turned ON / OFF based on the magnitude relationship between the voltage of the specific power supply and the required voltage of the load. The other is provided with a single control unit that maintains an ON state or an OFF state.

According to this configuration, the control unit has a system mode and a power supply mode as modes for supplying power to the load, so that the system power supply or the system power supply and the specific power supply can be used depending on the situation. It is possible to supply electric power or to supply electric power using a specific power source. As a result, it is possible to suitably supply power to the load using the system power supply and the specific power supply.

Further, in the power supply mode, control is performed by the single control unit, so that the switching loss can be reduced as compared with the configuration in which both the first conversion switching element and the second conversion switching element are periodically turned on / off. Can be done.

Regarding the power system, when the voltage of the specific power supply is lower than the required voltage of the load, the single control unit periodically turns on / off the first conversion switching element to supply the power of the specific power supply. The first single control that keeps the second conversion switching element in the ON state or the OFF state so that the power output from the first conversion circuit is transmitted to the load via the second conversion circuit while boosting the voltage. It is good to do.

According to this configuration, when the voltage of the specific power supply is lower than the required voltage of the load, the power of the specific power supply is boosted by the first conversion circuit by periodically turning on / off the first conversion switching element. .. Then, the boosted power is transmitted to the load via the second conversion circuit. As a result, it is possible to supply power to the load with a voltage closer to the required voltage of the load than the voltage of the specific power supply. In this case, it is not necessary to step down the power output from the first conversion circuit by the second conversion circuit. Therefore, by maintaining the second conversion switching element in the ON state or the OFF state, the switching loss of the second conversion switching element can be reduced.

Regarding the power system, when the voltage of the specific power supply is higher than the required voltage of the load, the single control unit transmits the power of the specific power supply to the second conversion circuit via the first conversion circuit. While maintaining the first conversion switching element in the ON state or the OFF state so as to be performed, the second single control is performed in which the second conversion switching element is periodically turned ON / OFF to step down the power of the specific power source. It is good.

According to this configuration, when the voltage of the specific power supply is higher than the required voltage of the load, the first conversion switching element is maintained in the ON state or the OFF state, and the power of the specific power supply is not converted and the second conversion is performed. Input to the circuit. Then, when the second conversion switching element is periodically turned ON / OFF, the power input to the second conversion circuit is stepped down by the second conversion circuit, and the stepped down power is input to the load. As a result, it is possible to supply power to the load with a voltage closer to the required voltage of the load than the voltage of the specific power supply. In this case, since the first conversion switching element is maintained in the ON state or the OFF state, the switching loss of the first conversion switching element can be reduced.

Regarding the power system, the specific power supply is a power storage device, the load is a vehicle power storage device, and the power system detects a voltage of the power storage device as the voltage of the specific power supply. A comparison unit including a sensor and a required voltage sensor that detects the voltage of the vehicle power storage device as the required voltage of the load, and the single control unit repeatedly compares the voltages of both power storage devices during the power supply mode. It is preferable to switch the switching mode of the first conversion switching element and the second conversion switching element based on the comparison result of the comparison unit.

According to this configuration, the vehicle power storage device is charged using the electric power stored in the power power storage device in the power supply mode. In this case, since the voltage of the power storage device and the voltage of the vehicle power storage device change as the SOCs of both power storage devices change, the magnitude relationship between the two can also change.

In this regard, according to this configuration, the voltage of the power storage device and the voltage of the vehicle power storage device are repeatedly compared during the power supply mode, and the switching mode of both conversion switching elements is switched based on the comparison result. .. As a result, the magnitude relationship between the voltage of the power storage device and the voltage of the vehicle power storage device changes during the power supply mode due to the charging of the vehicle power storage device using the power storage device. I can handle it.

The power supply device that achieves the above object is an AC / DC conversion circuit that converts the system power output from the system power supply into DC power, and a power conversion circuit that is connected to a specific power source different from the system power supply. A first conversion circuit having a first conversion switching element, a power conversion circuit connected to both the AC / DC conversion circuit and the first conversion circuit, and a second conversion circuit having a second conversion switching element. An intermediate capacitor provided between the AC / DC conversion circuit and the second conversion circuit and connected to the first conversion circuit, the AC / DC conversion circuit, the first conversion circuit, and the second conversion. It is provided with a control unit that controls power by controlling the circuit, and is used to supply the power converted by the second conversion circuit to the load, and the control unit is used for supplying the load to the load. The control unit includes at least a system mode in which power is supplied to the load using the system power supply and a power supply mode in which power is supplied to the load using the specific power supply as a mode for supplying power. Periodically turns on / off either the first conversion switching element or the second conversion switching element based on the magnitude relationship between the voltage of the specific power supply and the required voltage of the load in the power supply mode. On the one hand, the other is provided with a single control unit that keeps the other in the ON state or the OFF state.

According to this configuration, the control unit has a system mode and a power supply mode as modes for supplying power to the load, so that the system power supply or the system power supply and the specific power supply can be used depending on the situation. It is possible to supply electric power or to supply electric power using a specific power source. As a result, it is possible to suitably supply power to the load using the system power supply and the specific power supply.

Further, in the power supply mode, control is performed by the single control unit, so that the switching loss can be reduced as compared with the configuration in which both the first conversion switching element and the second conversion switching element are periodically turned on / off. Can be done.

According to the present invention, it is possible to suitably supply electric power to a load using a system power supply and a specific power supply.

The circuit diagram which shows the outline of the electric power supply apparatus and electric power system of 1st Embodiment. A flowchart for explaining switching control in the power supply mode. The circuit diagram which shows the outline of the electric power supply apparatus and electric power system of 2nd Embodiment.

(First Embodiment)
Hereinafter, the first embodiment of the power system and the power supply device will be described. In this embodiment, the power supply device is installed in a factory, a commercial facility, or the like. That is, the power system of this embodiment is not for home use but for commercial or industrial use.

As shown in FIG. 1, the electric power system 10 of the present embodiment includes a system power supply 11, a power storage device 12 as a specific power source, a vehicle 20, and a power supply device 30.
The system power supply 11 outputs, for example, a three-phase system power P0. The maximum value of the grid power P0 that can be supplied by the grid power supply 11 varies depending on the contents of the contract with the power company, the power usage status of other power systems, and the like.

The power storage device 12 is, for example, a secondary battery or an electric double layer capacitor. The power supply voltage Vp, which is the voltage of the power storage device 12, varies depending on the SOC (charging state) of the power storage device 12. As an example, the power supply voltage Vp increases as the SOC of the power storage device 12 increases. Specifically, the power supply voltage Vp varies over the range from the minimum power supply voltage Vpmin to the maximum power supply voltage Vpmax. In this embodiment, the power supply voltage Vp corresponds to the voltage of the specific power supply.

The vehicle 20 includes a vehicle power storage device 21 as a load and a vehicle ECU 22 that controls the vehicle power storage device 21.
The vehicle power storage device 21 is, for example, a secondary battery or an electric double layer capacitor. The load voltage Vr, which is the voltage of the vehicle power storage device 21, varies depending on the type of the vehicle power storage device 21 and the SOC (charging state). For example, the load voltage Vr differs depending on whether the vehicle power storage device 21 is a lithium ion battery or a lead storage battery. Further, in general, the load voltage Vr increases as the SOC of the vehicle power storage device 21 increases.

Here, the minimum value of the load voltage Vr assumed in the power system 10 is referred to as the minimum load voltage Vrmin, and the maximum value of the load voltage Vr is referred to as the maximum load voltage Vrmax. The load voltage Vr varies over the range from the minimum load voltage Vrmin to the maximum load voltage Vrmax.

In the present embodiment, the minimum power supply voltage Vpmin is lower than the minimum load voltage Vrmin, and the maximum power supply voltage Vpmax is higher than the minimum load voltage Vrmin. Specifically, Vpmin <Vrmin <Vpmax <Vrmax. Therefore, depending on the SOCs of both power storage devices 12 and 21, the power supply voltage Vp may be lower than the load voltage Vr, or the power supply voltage Vp may be higher than the load voltage Vr. The specific configuration of the power storage device 12 and the vehicle power storage device 21 is arbitrary.

Since the maximum load voltage Vrmax is set higher than the maximum power supply voltage Vpmax, the range of the vehicle power storage device 21 applicable to the power system 10 can be expanded. Thereby, versatility can be improved.

In this embodiment, the load voltage Vr corresponds to the required voltage of the load. Specifically, the vehicle power storage device 21 is charged by inputting the DC power of the load voltage Vr, which is the voltage of the vehicle power storage device 21, into the vehicle power storage device 21. Therefore, the load voltage Vr can be said to be the required voltage required for the vehicle power storage device 21 to charge.

The vehicle ECU 22 controls the charging of the vehicle power storage device 21. The vehicle ECU 22 is configured to be electrically connectable to the power supply device 30. When the vehicle ECU 22 is electrically connected to the power supply device 30, the vehicle ECU 22 communicates with the power supply device 30 to notify the power supply device 30 of the required power. In the present embodiment, the required electric power is the electric power required for the vehicle power storage device 21 to charge.

The power supply device 30 includes system input terminals (system input units) 31 to 33 to which system power P0 from the system power supply 11 is input. By connecting the grid power supply 11 to the grid input terminals 31 to 33, the grid power P0 is input to the power supply device 30.

In this embodiment, there are three system input terminals 31 to 33 corresponding to the three-phase system power. However, the present invention is not limited to this, and the number of system input terminals may be two in correspondence with the single-phase system power P0. That is, the system power P0 may be single-phase or three-phase.

The power supply device 30 includes storage input terminals (in other words, charging power input units) 34 and 35 for electrically connecting to the power storage device 12. The storage input terminals 34 and 35 are connected to the positive electrode terminal and the negative electrode terminal of the power storage device 12. Of the two storage input terminals 34 and 35, the positive storage input terminal 34 is connected to the positive terminal of the power storage device 12, and the negative electrode storage input terminal 35 is connected to the negative electrode terminal of the power storage device 12. When the power storage device 12 is connected to the power storage input terminals 34 and 35, the power from the power storage device 12 is input to the power supply device 30.

The power supply device 30 has a connector 40 as a load connection portion used for electrically connecting to the vehicle 20. By connecting the connector 40 to the vehicle 20, the power supply device 30, the vehicle power storage device 21, and the vehicle ECU 22 are electrically connected. The connector 40 can be said to be a connection portion for connecting the load and the power supply device 30.

The connector 40 includes a positive electrode load input terminal 41 connected to the positive electrode terminal of the vehicle power storage device 21, a negative electrode load input terminal 42 connected to the negative electrode terminal of the vehicle power storage device 21, and a control terminal connected to the vehicle ECU 22. 43 and.

The power supply device 30 has a negative electrode wiring 44 that connects the negative electrode storage input terminal 35 and the negative electrode load input terminal 42. As a result, the negative electrodes of the power storage device 12 and the vehicle power storage device 21 are electrically connected to each other.

In this embodiment, the number of connectors 40 is one for convenience of explanation. However, the present invention is not limited to this, and the power supply device 30 may have a plurality of connectors 40 connected in parallel to each other and may be connected to the plurality of vehicles 20 at the same time. In this case, the electric power supply device 30 can supply electric power to a plurality of vehicles 20 at the same time.

As described above, the power supply device 30 is configured to be connectable to the system power supply 11, the power storage device 12, and the vehicle 20 (specifically, the vehicle power storage device 21). Then, the power supply device 30 supplies power to the vehicle power storage device 21 by using at least one of the system power supply 11 and the power storage device 12.

The power supply device 30 will be described in detail below.
As shown in FIG. 1, the power supply device 30 includes a filter circuit 50, a first transformer 60, a second transformer 70, a primary side circuit 80, and a booster circuit 90 as a first secondary side circuit. A step-down circuit 100 as a second secondary circuit and a control circuit 120 are provided.

The filter circuit 50 reduces noise included in the system power P0 input from the system input terminals 31 to 33. The filter circuit 50 is, for example, an LC circuit having a filter inductor 51 and a filter capacitor 52. However, the present invention is not limited to this, and the specific configuration of the filter circuit 50 is arbitrary.

The first transformer 60 has a first primary winding 61 and a first secondary winding 62. That is, the first transformer 60 is a so-called insulated type.
The first secondary winding 62 has a first midpoint tap 62a. The first midpoint tap 62a is connected to the power storage device 12. Specifically, the first midpoint tap 62a is connected to the positive electrode storage input terminal 34. As a result, the first midpoint tap 62a is connected to the positive electrode terminal of the power storage device 12.

The second transformer 70 has a second primary winding 71 and a second secondary winding 72. That is, the second transformer 70 is a so-called insulated type. The first primary winding 61 and the second primary winding 71 are connected in series.

The second secondary winding 72 has a second midpoint tap 72a. The second midpoint tap 72a is connected to the vehicle 20. Specifically, the second midpoint tap 72a is connected to the connector 40, and more specifically, to the positive electrode load input terminal 41.

The primary side circuit 80 is provided between the system input terminals 31 to 33 and both transformers 60 and 70. The primary side circuit 80 is connected to the system input terminals 31 to 33 via the filter circuit 50, and the system power P0 whose noise is reduced by the filter circuit 50 is input to the primary side circuit 80. The primary side circuit 80 is connected to a series connector of both primary side windings 61 and 71.

The primary side circuit 80 includes primary side coils 81u to 81w and primary side switching elements 82ua to 82wb. The primary side circuit 80 performs AC power conversion by periodically turning on / off the primary side switching elements 82ua to 82wb.

The primary coil 81u to 81w are connected to the system input terminals 31 to 33 via the filter circuit 50 (specifically, the filter inductor 51).
The primary side switching elements 82ua to 82wb are bidirectional switching elements capable of turning on / off the voltage in both the forward direction and the reverse direction. The specific configuration of the primary side switching elements 82ua to 82wb is arbitrary, but it is preferable to have, for example, a plurality of IGBTs or MOSFETs and diodes connected in parallel with each other.

The primary side switching elements 82ua to 82wb are connected in series with the primary side upper arm switching elements 82ua, 82va, 82wa and the primary side upper arm switching elements 82ua, 82va, 82wa by the primary side connecting lines 83u, 83v, 83w. It is composed of connected primary side lower arm switching elements 82ub, 82vb, 82wb.

The series connection body of the primary side upper arm switching elements 82ua, 82va, 82wa and the primary side lower arm switching elements 82ub, 82vb, 82wb are connected in parallel with each other and of both primary side windings 61, 71. It is connected in parallel to the series connector. The primary side coils 81u, 81v, 81w are connected to the primary side connection lines 83u, 83v, 83w.

The booster circuit 90 boosts the power output from, for example, the power storage device 12. The booster circuit 90 is a booster coil as a first secondary coil provided between the first midpoint tap 62a, which is the midpoint tap of the first secondary winding 62, and the power storage device 12. It includes 91 and step-up switching elements 92 to 95 as first secondary side switching elements connected to the first secondary side winding 62.

The boost coil 91 is provided on the wiring connecting the first midpoint tap 62a and the positive electrode storage input terminal 34.
The step-up switching elements 92 to 95 are, for example, n-type MOSFETs and IGBTs. However, the present invention is not limited to this, and the specific configuration of the step-up switching elements 92 to 95 is arbitrary.

The step-up switching elements 92 to 95 are, for example, the step-up upper arm switching elements 92 and 94 and the step-up lower arm switching elements 93 and 95 connected in series with the step-up upper arm switching elements 92 and 94 via the step-up connection lines 96 and 97. It is composed of and.

One end of the first secondary winding 62 is connected to the first boost connecting wire 96, and the other end of the first secondary winding 62 is connected to the second boost connecting wire 97. As a result, the step-up switching elements 92 to 95 are connected to the first secondary winding 62. In the present embodiment, the step-up connection lines 96 and 97 correspond to the "first secondary side connection line".

The booster circuit 90 connects the series connection of both first boost switching elements 92 and 93 and the series connection of both second boost switching elements 94 and 95 in parallel to the first boost wiring 98 and the second boost wiring 99. have. The first booster wiring 98 connects both booster upper arm switching elements 92 and 94, and the second booster wiring 99 connects both booster lower arm switching elements 93 and 95. The second booster wiring 99 is connected to the negative electrode wiring 44.

The step-down circuit 100 steps down the DC power output from the step-up circuit 90, for example. The step-down circuit 100 is a step-down coil as a second secondary coil provided between the second midpoint tap 72a, which is the midpoint tap of the second secondary winding 72, and the vehicle power storage device 21. The 101 and the step-down switching elements 102 to 105 as the second secondary side switching element connected to the second secondary side winding 72 are provided.

The step-down coil 101 is provided on the wiring connecting the second center tap 72a and the positive electrode load input terminal 41.
The step-down switching elements 102 to 105 are, for example, n-type MOSFETs and IGBTs. However, the present invention is not limited to this, and the specific configuration of the step-down switching elements 102 to 105 is arbitrary.

The step-down switching elements 102 to 105 are, for example, the step-down upper arm switching elements 102, 104 and the step-down arm switching elements 103, 105 connected in series with the step-down upper arm switching elements 102, 104 via the step-down connecting lines 106, 107. It is composed of and.

One end of the second secondary winding 72 is connected to the first step-down connecting line 106, and the other end of the second secondary winding 72 is connected to the second step-down connecting line 107. As a result, the step-down switching elements 102 to 105 are connected to the second secondary winding 72. In the present embodiment, the step-down connection lines 106 and 107 correspond to the "second secondary side connection line".

The step-down circuit 100 connects the series connection of both first step-down switching elements 102 and 103 and the series connection of both second step-down switching elements 104 and 105 in parallel to the first step-down wiring 108 and the second step-down wiring 109. have. The first step-down wiring 108 connects both step-down upper arm switching elements 102 and 104, and the second step-down wiring 109 connects both step-down lower arm switching elements 103 and 105.

The step-up circuit 90 and the step-down circuit 100 are connected. Specifically, the first step-down wiring 108 and the first step-up wiring 98 are connected, and the second step-down wiring 109 and the second step-up wiring 99 are connected. As a result, the power output from the step-up circuit 90 is input to the step-down circuit 100, and the step-down circuit 100 performs conversion to lower the voltage value.

The power supply device 30 includes an intermediate capacitor 110 provided between the step-up circuit 90 and the step-down circuit 100. One end of the intermediate capacitor 110 is connected to the first step-up wiring 98 and the first step-down wiring 108, and the other end of the intermediate capacitor 110 is connected to the second step-up wiring 99 and the second step-down wiring 109.

In such a configuration, it can be said that the step-up switching elements 92 to 95 are connected to the step-down circuit 100 (specifically, the step-down switching elements 102 to 105) via the intermediate capacitor 110. Further, it can be said that the step-down switching elements 102 to 105 are connected to the step-up circuit 90 (specifically, the step-up switching elements 92 to 95) via the intermediate capacitor 110.

The control circuit 120 as a control unit controls the primary side circuit 80, the step-up circuit 90, and the step-down circuit 100. The control circuit 120 controls the primary side switching elements 82ua to 82wb, the step-up switching elements 92 to 95, and the step-down switching elements 102 to 105, thereby using at least one of the system power supply 11 and the power storage device 12 for the vehicle. It is configured to supply power to the power storage device 21.

The specific hardware configuration of the control circuit 120 is arbitrary. For example, the control circuit 120 may be configured to have a dedicated hardware circuit for performing switching control, a control program for performing switching control, a memory in which necessary information is stored, and switching control based on the control program. It may be configured to have a CPU that performs the above.

The power supply device 30 includes a power supply voltage sensor 121 that detects the power supply voltage Vp as the voltage of the specific power supply, and a load voltage sensor 122 that detects the load voltage Vr as the required voltage of the load. The power supply voltage sensor 121 detects the voltage of the power storage device 12 by detecting the voltage between the two storage input terminals 34 and 35, and outputs the detection result to the control circuit 120. The load voltage sensor 122 detects the voltage of the vehicle power storage device 21 by detecting the voltage between the load input terminals 41 and 42, and outputs the detection result to the control circuit 120. As a result, the control circuit 120 can grasp the power supply voltage Vp and the load voltage Vr.

Further, the control circuit 120 is connected to the vehicle ECU 22 via the control terminal 43, and can communicate with the vehicle ECU 22. For example, the vehicle ECU 22 notifies the control circuit 120 of the required power. The control circuit 120 controls the primary side circuit 80, the step-up circuit 90, and the step-down circuit 100 so as to supply the same power as the required power or a power close to the required power.

The switching control by the control circuit 120 will be described in detail below.
The control circuit 120 of the present embodiment has, as modes for supplying electric power to the vehicle power storage device 21, a system mode in which power is supplied to the vehicle power storage device 21 using at least the system power supply 11, and a power storage device 12 It has a power supply mode for supplying electric power to the vehicle power storage device 21 by using the power storage device 21. At least the use of the system power supply 11 includes a case where only the system power supply 11 is used and a case where both the system power supply 11 and the power storage device 12 are used.

Incidentally, the control circuit 120 controls a mode for supplying electric power to the vehicle power storage device 21 according to the situation. The specific configuration of the mode control is arbitrary. For example, the control circuit 120 may be configured to select the system mode in the predetermined first time zone and the power supply mode in the second time zone. Further, the control circuit 120 selects the power supply mode when the SOC of the power storage device 12 (in other words, the charging state) is equal to or higher than the threshold value, and when the SOC of the power storage device 12 is less than the threshold value, the control circuit 120 selects the power supply mode. The system mode may be selected. Further, the control circuit 120 may be configured to select a mode for supplying electric power to the vehicle power storage device 21 based on a selection operation by the user.

In the system mode, the control circuit 120 periodically turns on / off the primary side switching elements 82ua to 82wb, the step-up switching elements 92 to 95, and the step-down switching elements 102 to 105 to turn on / off the system power supply 11 or the system power supply. Power is supplied using both the 11 and the power storage device 12.

For example, the control circuit 120 determines the target value of the system power P0 and the target value of the power discharged from the power storage device 12 based on the required power required from the vehicle ECU 22. Then, the control circuit 120 cycles the primary side switching elements 82ua to 82wb, the step-up switching elements 92 to 95, and the step-down switching elements 102 to 105 so that the system power P0 and the output power of the power storage device 12 become the target values. Turn it on and off.

For example, the control circuit 120 alternately switches the switching patterns of the step-up switching elements 92 to 95 between the first pattern and the second pattern. In the first pattern, the first booster upper arm switching element 92 and the second booster lower arm switching element 95 are in the ON state, and the first booster lower arm switching element 93 and the second booster upper arm switching element 94 are in the OFF state. It is a switching pattern. In the second pattern, the first booster upper arm switching element 92 and the second booster lower arm switching element 95 are in the OFF state, and the first booster lower arm switching element 93 and the second booster upper arm switching element 94 are in the ON state. It is a switching pattern. The same applies to the step-down switching elements 102 to 105.

According to such a configuration, the system power P0 input to the power supply device 30 is boosted by the primary side circuit 80 and the first transformer 60 and input to the booster circuit 90. Then, the electric power input to the booster circuit 90 is rectified and stepped down by the booster circuit 90 and the intermediate capacitor 110. Further, the output power from the power storage device 12 is boosted by the booster circuit 90 and supplied to the intermediate capacitor 110. As a result, DC power with an intermediate voltage of Vm is input to the intermediate capacitor 110. In this case, it can be said that the DC power output from the booster circuit 90 is stabilized by the intermediate capacitor 110.

Then, the DC power whose voltage is stabilized by the intermediate capacitor 110 is input to the step-down circuit 100, is stepped down to the voltage of the vehicle power storage device 21 by the step-down circuit 100, and is input to the vehicle power storage device 21. As a result, power is supplied to the vehicle power storage device 21 using both the system power supply 11 and the power power storage device 12, that is, the vehicle power storage device 21 is charged.

Incidentally, the intermediate voltage Vm in the system mode is a voltage higher than the power supply voltage Vp. Specifically, the intermediate voltage Vm is set to a voltage higher than the maximum power supply voltage Vpmax. Further, the intermediate voltage Vm of the present embodiment is a voltage higher than the load voltage Vr, and is specifically set higher than the maximum load voltage Vrmax.

For example, the control circuit 120 may supply power using only the system power supply 11 when the required power is smaller than the maximum value of the system power P0 that can be supplied by the system power supply 11. In this case, the control circuit 120 sets the required power to a target value within the maximum value of the system power P0 that can be supplied by the system power supply 11, and corresponds to the target value of the primary side switching elements 82ua to 82wb. Control the duty ratio. As a result, DC power having the same value as the required power is input to the step-down circuit 100. Then, the control circuit 120 periodically turns on the step-down switching elements 102 to 105 so that the DC power input to the step-down circuit 100 is converted into the DC power having the load voltage Vr and the same value as the required power. Turn it off. In this case, the output power from the power storage device 12 is "0". In other words, it can be said that the control circuit 120 periodically turns on / off the step-down switching elements 102 to 105 at a duty ratio at which the output power from the power storage device 12 becomes “0”.

Next, the power mode will be described.
In the power supply mode, the control circuit 120 supplies power by using the power storage device 12 by periodically turning on / off at least one of the step-up switching elements 92 to 95 and the step-down switching elements 102 to 105. On the other hand, in the power supply mode, the control circuit 120 does not periodically turn ON / OFF the primary side switching elements 82ua to 82wb, but always keeps them OFF. That is, in the control circuit 120, when the mode for supplying power to the vehicle power storage device 21 is the power supply mode, the primary side switching elements 82ua to prevent the system power P0 from being transmitted to both transformers 60 and 70. It can be said that 82wb is in the OFF state.

Here, the control circuit 120 has different switching modes in the power supply mode depending on the magnitude relationship between the power supply voltage Vp and the load voltage Vr. This point will be described in detail with reference to FIG. For convenience of explanation, a flowchart will be shown in the following description and FIG. 2, but the actual control mode of the control circuit 120 is not limited to software control as in the flowchart above, and hardware using a comparator or the like is used. It may be control.

As shown in FIG. 2, in step S101, the control circuit 120 grasps the power supply voltage Vp and the load voltage Vr based on the detection results of both voltage sensors 121 and 122, and the power supply voltage Vp is lower than the load voltage Vr. Judge whether or not.

When the power supply voltage Vp is lower than the load voltage Vr, the control circuit 120 proceeds to step S102 to perform the first single control. The first single control is a kind of single control in which either one of the step-up switching elements 92 to 95 or the step-down switching elements 102 to 105 is periodically turned ON / OFF while the other is maintained in the ON state or the OFF state. Specifically, in the first single control, the step-up switching elements 92 to 95 are periodically turned ON / OFF, while the step-down upper arm switching elements 102 and 104 are maintained in the ON state and the step-down arm switching elements 103 and 105 are turned on and off. This is a switching mode for maintaining the OFF state.

For example, the control circuit 120 alternately switches the switching patterns of the step-up switching elements 92 to 95 between the first pattern and the second pattern. The first pattern and the second pattern have already been described.

According to such a configuration, the electric power output from the power storage device 12 is boosted by the step-up circuit 90, and is passed through the step-down upper arm switching elements 102 and 104 to the vehicle power storage device 21 without being stepped down by the step-down circuit 100. Be supplied. As a result, the vehicle power storage device 21 is charged using the power power storage device 12.

Incidentally, in the first single control, the control circuit 120 adjusts the duty ratios of the step-up switching elements 92 to 95 based on the required power. As a result, power corresponding to the required power is output from the power storage device 12.

On the other hand, when the power supply voltage Vp is not lower than the load voltage Vr, the control circuit 120 negatively determines step S101 and proceeds to step S103. In step S103, the control circuit 120 determines whether or not the power supply voltage Vp is higher than the load voltage Vr. When the power supply voltage Vp is higher than the load voltage Vr, the control circuit 120 performs the second single control, which is a kind of single control, in step S104.

The second single control is to periodically turn on / off the step-down switching elements 102 to 105, while keeping the step-up upper arm switching elements 92 and 94 in the ON state and turning the step-up lower arm switching elements 93 and 95 into the OFF state. It is a control to maintain.

For example, the control circuit 120 alternately switches the switching patterns of the step-down switching elements 102 to 105 between the first pattern and the second pattern. The first pattern and the second pattern have already been described.

According to such a configuration, the electric power output from the power storage device 12 is input to the step-down circuit 100 through the step-up upper arm switching elements 92 and 94 without being boosted by the step-up circuit 90, and is input to the step-down circuit 100 by the step-down circuit 100. After the step is stepped down, it is supplied to the vehicle power storage device 21. As a result, the vehicle power storage device 21 is charged using the power power storage device 12.

Incidentally, in the second single control, the control circuit 120 adjusts the duty ratio of the step-down switching elements 102 to 105 based on the required power. As a result, power corresponding to the required power is output from the power storage device 12.

As shown in FIG. 2, when the power supply voltage Vp and the load voltage Vr are the same, the control circuit 120 makes a negative determination in step S103 and performs double control in step S105. The double control is a control in which both step-up and step-down are performed by periodically turning on / off the step-up switching elements 92 to 95 and the step-down switching elements 102 to 105, as in the system mode.

As described above, the control circuit 120 of the present embodiment performs the process of comparing the power supply voltage Vp and the load voltage Vr (steps S101 and S103), and based on the comparison result, the step-up switching elements 92 to 95 and the step-down switching The elements 102 to 105 are switched to the first single control or the second single control having different switching modes.

After executing any of the processes of steps S102, S104, and S105, the control circuit 120 determines in step S106 whether or not the predetermined charging end condition is satisfied. The charging end condition is arbitrary, but for example, the control circuit 120 may receive an end notification from the vehicle ECU 22.

When the charging end condition is satisfied, the control circuit 120 executes an end process of stopping the operation of the step-up circuit 90 and the step-down circuit 100 in step S107. For example, the control circuit 120 turns off the step-up switching elements 92 to 95 and the step-down switching elements 102 to 105.

If the charging end condition is not satisfied, the control circuit 120 returns to step S101. As a result, the power supply voltage Vp detected at that time and the load voltage Vr are compared again, and switching control is performed according to the comparison result.

That is, the control circuit 120 repeatedly compares the power supply voltage Vp and the load voltage Vr in the power supply mode, and switches the switching modes of both switching elements 92 to 95 and 102 to 105 based on the comparison result. As a result, switching control corresponding to changes in the power supply voltage Vp and the load voltage Vr in the power supply mode is performed.

In the present embodiment, the control circuit 120 that performs the first single control in step S102 or the second single control in step S104 corresponds to the "single control unit", and the control circuit 120 that executes the process of step S101 or step S103 is ". Corresponds to the "comparison section".

Next, the operation of this embodiment will be described.
When the system mode is set as the mode for supplying power to the vehicle power storage device 21, power is supplied to the vehicle power storage device 21 using at least the system power supply 11. Further, when the power supply mode is set as the mode for supplying the electric power to the vehicle electric power storage device 21, the electric power is supplied to the vehicle electric power storage device 21 using the power electric power storage device 12.

Here, in the power supply mode, the periodic ON / OFF operation of either the step-up switching elements 92 to 95 or the step-down switching elements 102 to 105 is stopped according to the magnitude relationship between the power supply voltage Vp and the load voltage Vr. .. As a result, the switching loss is smaller than that in the configuration in which both the switching elements 92 to 95 and 102 to 105 are periodically turned on and off.

According to the present embodiment described in detail above, the following effects are obtained.
(1-1) The electric power system 10 includes a system power supply 11 and a power storage device 12 as a specific power source different from the system power supply 11, and a vehicle power storage device 21 as a load. The power system 10 includes a first transformer 60 having a first primary winding 61 and a first secondary winding 62, a second primary winding 71, and a second secondary winding. It includes a second transformer 70 having 72. Both primary windings 61 and 71 are connected in series. The first secondary winding 62 has a first midpoint tap 62a to which the power storage device 12 is connected. The second secondary winding 72 has a second midpoint tap 72a to which the vehicle power storage device 21 is connected.

The power system 10 includes a primary circuit 80 connected to the system power supply 11 and connected to a series connector of both primary windings 61 and 71, a booster circuit 90 as a first secondary circuit, and a booster circuit 90. It includes a step-down circuit 100 as a second secondary circuit, and an intermediate capacitor 110 provided between the step-up circuit 90 and the step-down circuit 100. The primary side circuit 80 has primary side switching elements 82ua to 82wb. The booster circuit 90 includes a booster coil 91 as a first secondary coil provided between the first midpoint tap 62a and the power storage device 12, and a first secondary coil connected to the booster coil 91. It includes step-up switching elements 92 to 95 as side switching elements. The step-down circuit 100 includes a step-down coil 101 as a second secondary coil provided between the second center tap 72a and the vehicle power storage device 21, and a second secondary coil connected to the step-down coil 101. It includes step-down switching elements 102 to 105 as side switching elements.

The power system 10 includes a control circuit 120 as a control unit that controls a primary circuit 80, a step-up circuit 90, and a step-down circuit 100. The control circuit 120 includes a system mode and a power supply mode as modes for supplying electric power to the vehicle power storage device 21. The system mode is a mode in which power is supplied to the vehicle power storage device 21 by using at least the system power supply 11 by periodically turning on / off the switching elements 82ua to 82wb, 92 to 95, 102 to 105. .. In the power supply mode, power is supplied to the vehicle power storage device 21 by using the power power storage device 12 by periodically turning on / off at least one of the step-up switching elements 92 to 95 and the step-down switching elements 102 to 105. The mode.

In such a configuration, in the power supply mode, the control circuit 120 is a step-up switching element 92 to 95 or a step-up switching element 92 to 95 or based on the magnitude relationship between the power supply voltage Vp, which is the voltage of the power storage device 12, and the load voltage Vr, which is the required voltage of the load. Single control is performed in which one of the step-down switching elements 102 to 105 is periodically turned ON / OFF while the other is maintained in the OFF state.

According to this configuration, the control circuit 120 has a system mode and a power supply mode as modes for supplying electric power to the vehicle power storage device 21, so that the system power supply 11 or the system power supply can be used depending on the situation. Power can be supplied using the power storage device 12 and the power storage device 12, or power can be supplied using only the power power storage device 12. Further, by performing single control in the power supply mode, it is possible to reduce the switching loss as compared with the configuration in which both the step-up switching elements 92 to 95 and the step-down switching elements 102 to 105 are periodically turned on / off. can.

(1-2) In the power supply mode, when the power supply voltage Vp is lower than the load voltage Vr, the control circuit 120 periodically turns on / off the step-up switching elements 92 to 95, while the step-down switching elements 102 to 105. Is maintained in the ON state or the OFF state.

According to this configuration, when the power supply voltage Vp is lower than the load voltage Vr, the power output from the power storage device 12 is boosted by the booster circuit 90. As a result, DC power having a voltage closer to the load voltage Vr than the power supply voltage Vp can be supplied to the vehicle power storage device 21. In this case, it is not necessary to step down the DC power output from the step-up circuit 90 by the step-down circuit 100. As a result, the switching loss of the step-down switching elements 102 to 105 can be reduced by keeping the step-down switching elements 102 to 105 in the ON state or the OFF state.

(1-3) Step-down switching elements 102 to 105 include step-down upper arm switching elements 102, 104 and step-down arm switching elements 103, 105 connected to each other by step-down connecting lines 106, 107. The step-down connection lines 106 and 107 are connected to the second secondary winding 72. The step-down upper arm switching elements 102 and 104 and the step-down lower arm switching elements 103 and 105 are connected to the step-up circuit 90 via an intermediate capacitor 110.

The control circuit 120 performs the first single control when the power supply voltage Vp is lower than the load voltage Vr. In the first single control, the step-up switching elements 92 to 95 are periodically turned ON / OFF, while the step-down upper arm switching elements 102 and 104 are maintained in the ON state and the step-down lower arm switching elements 103 and 105 are maintained in the OFF state. Switching control.

According to such a configuration, the DC power boosted by the step-up circuit 90 is input to the vehicle power storage device 21 through the step-down circuit 100. As a result, the DC power boosted by the booster circuit 90 can be supplied to the vehicle power storage device 21 without forming a path that bypasses the step-down circuit 100.

(1-4) In the power supply mode, when the power supply voltage Vp is higher than the load voltage Vr, the control circuit 120 periodically turns on / off the step-down switching elements 102 to 105, while the step-up switching elements 92 to 95. Is maintained in the ON state or the OFF state.

According to this configuration, when the power supply voltage Vp is higher than the load voltage Vr, the step-up switching elements 92 to 95 are maintained in the ON state or the OFF state, so that the power of the power storage device 12 is boosted. Is input to the step-down circuit 100. Then, by periodically turning on / off the step-down switching elements 102 to 105, the power input to the step-down circuit 100 is stepped down by the step-down circuit 100, and the step-down power is supplied to the vehicle power storage device 21. NS. As a result, electric power having a voltage closer to the load voltage Vr than the power supply voltage Vp can be supplied to the vehicle power storage device 21. In this case, since the step-up switching elements 92 to 95 are maintained in the ON state or the OFF state, the switching loss of the step-up switching elements 92 to 95 can be reduced.

(1-5) The step-up switching elements 92 to 95 include a step-up upper arm switching elements 92 and 94 and a step-up lower arm switching elements 93 and 95 connected to each other by the step-up connection lines 96 and 97. The step-up connection lines 96 and 97 are connected to the first secondary winding 62. The step-up upper arm switching elements 92 and 94 and the step-up lower arm switching elements 93 and 95 are connected to the step-down circuit 100 via an intermediate capacitor 110.

The control circuit 120 performs the second single control when the power supply voltage Vp is higher than the load voltage Vr. In the second single control, the step-down switching elements 102 to 105 are periodically turned ON / OFF, while the step-up upper arm switching elements 92 and 94 are maintained in the ON state and the step-up lower arm switching elements 93 and 95 are maintained in the OFF state. Switching control.

According to such a configuration, the electric power output from the power storage device 12 is input to the step-down circuit 100 through the booster circuit 90, stepped down by the step-down circuit 100, and supplied to the vehicle power storage device 21. As a result, the electric power of the power storage device 12 can be supplied to the vehicle power storage device 21 without forming a path that bypasses the booster circuit 90.

(1-6) The power system 10 includes a power supply voltage sensor 121 for detecting the power supply voltage Vp and a load voltage sensor 122 for detecting the load voltage Vr. The control circuit 120 repeatedly executes the processes of steps S101 and S103 for comparing the power supply voltage Vp and the load voltage Vr in the power supply mode, and based on the comparison result between the power supply voltage Vp and the load voltage Vr, the step-up switching element 92 The switching mode of ~ 95 and the step-down switching elements 102 to 105 is switched.

According to this configuration, the vehicle power storage device 21 is charged using the electric power stored in the power power storage device 12 in the power supply mode. In this case, since the power supply voltage Vp and the load voltage Vr change as the SOCs of both power storage devices 12 and 21 change, the magnitude relationship between the two can also change.

In this regard, according to the present embodiment, the comparison between the power supply voltage Vp and the load voltage Vr is repeatedly performed during the power supply mode, and the switching modes of both switching elements 92 to 95 and 102 to 105 are switched based on the comparison result. .. Thereby, it is possible to cope with the change in the magnitude relationship between the power supply voltage Vp and the load voltage Vr that may occur due to the charging of the vehicle power storage device 21 using the power storage device 12.

(1-7) In particular, in the configuration in which the control circuit 120 performs single control as in the present embodiment, the power supply is hindered due to the reverse magnitude relationship between the power supply voltage Vp and the load voltage Vr. May occur. For example, when the power supply voltage Vp becomes higher than the load voltage Vr during the first single control, or when the power supply voltage Vp becomes lower than the load voltage Vr during the second single control, the power storage device The power supply using 12 may be hindered.

In this respect, according to the present embodiment, the switching modes of both switching elements 92 to 95 and 102 to 105 are switched in accordance with the changes in the power supply voltage Vp and the load voltage Vr. As a result, the above-mentioned situation can be avoided, and stable power supply can be performed regardless of the change in the magnitude relationship between the power supply voltage Vp and the load voltage Vr.

(Second Embodiment)
In the present embodiment, the configuration of the power supply device 30 is different from that of the first embodiment. The difference will be described with reference to FIG.

As shown in FIG. 3, the power supply device 30 of the present embodiment controls the filter circuit 50, the AC / DC conversion circuit 200, the first conversion circuit 230, the second conversion circuit 240, the intermediate capacitor 110, and the like. The circuit 120 and the like are provided.

Considering that the power supply device 30 has one configuration of the power system 10, the power system 10 includes an AC / DC conversion circuit 200, a first conversion circuit 230, a second conversion circuit 240, and an intermediate capacitor 110. It can be said that the control circuit 120 is provided.

The AC / DC conversion circuit 200 converts the system power P0 output from the system power supply 11 into DC power.
The AC / DC conversion circuit 200 of the present embodiment includes a transformer 201 having a primary winding 202 and a secondary winding 203, and a primary matrix converter 210 provided on the primary side of the transformer 201. , A secondary side full bridge circuit 220 provided on the secondary side with respect to the transformer 201. That is, the AC / DC conversion circuit 200 of this embodiment is a dual active bridge type matrix converter.

The primary side matrix converter 210 is connected to the primary side winding 202 and is also connected to the system input terminals 31 to 33. As a result, the primary side matrix converter 210 is connected to the system power supply 11 via the system input terminals 31 to 33. The primary side matrix converter 210 is configured to enable bidirectional conversion of AC power.

The primary side matrix converter 210 includes primary side switching elements 211 to 216. The primary side matrix converter 210 performs AC power conversion by periodically turning ON / OFF the primary side switching elements 211 to 216. For example, the primary side matrix converter 210 converts the system power P0 into AC power of a predetermined voltage and outputs it to the primary side winding 202 of the transformer 201, or outputs the AC power input from the transformer 201 to the system power. It is converted to P0 and output to the system power supply 11.

The primary side switching elements 211 to 216 are bidirectional switching elements capable of turning on / off voltages in both the forward direction and the reverse direction. The specific configuration of the primary side switching elements 211 to 216 is arbitrary, but it is preferable to have, for example, a plurality of IGBTs or MOSFETs and diodes connected in parallel with each other.

The primary side switching elements 211 to 216 are connected in series with the primary side upper arm switching elements 211,212,213 by the primary side upper arm switching elements 211,212,213 and the primary side connecting lines 217,218,219. It is composed of connected primary side lower arm switching elements 214, 215 and 216. The series connection body of the primary side upper arm switching elements 211,212,213 and the primary side lower arm switching elements 214,215,216 is connected to the primary side winding 202 in a state of being connected in parallel with each other. There is.

The system input terminals 31 to 33 are connected to the primary side connection lines 217 to 219 via the filter circuit 50. As a result, the system power P0 is input to the primary side matrix converter 210.

The transformer 201 is provided between the primary side matrix converter 210 and the secondary side full bridge circuit 220, and performs voltage conversion of AC power. The transformation ratio corresponds to the turns ratio of the primary winding 202 and the secondary winding 203.

The secondary side full bridge circuit 220 is connected to the secondary side winding 203 and the intermediate capacitor 110. The secondary side full bridge circuit 220 is configured to enable bidirectional conversion of AC / DC. The secondary side full bridge circuit 220 is a secondary side connected in series to the secondary side upper arm switching elements 221 and 222 and the secondary side upper arm switching elements 221 and 222 via the secondary side connecting lines 225 and 226. It has lower arm switching elements 223 and 224. The secondary switching elements 221 to 224 are, for example, n-type MOSFETs. However, the present invention is not limited to this, and the specific configuration of the secondary side switching elements 221 to 224 is arbitrary.

The secondary winding 203 is connected to the secondary connecting lines 225 and 226. As a result, the AC power output from the transformer 201 (specifically, the secondary winding 203) is input to the secondary full bridge circuit 220.

The secondary side full bridge circuit 220 performs power conversion by periodically turning on / off the secondary side switching elements 221 to 224. For example, the secondary side full bridge circuit 220 converts the AC power input from the transformer 201 into DC power, or converts the DC power input from the intermediate capacitor 110 side into AC power.

That is, the AC / DC conversion circuit 200 performs bidirectional conversion between AC power and DC power by periodically turning ON / OFF the primary side switching elements 211 to 216 and the secondary side switching elements 221 to 224. ..

The first conversion circuit 230 is a power conversion circuit connected to the vehicle power storage device 21 as a specific power source. The first conversion circuit 230 of the present embodiment is, for example, a bidirectional converter capable of bidirectional conversion of DC power.

The first conversion circuit 230 includes, for example, first conversion switching elements 231 to 234. Specifically, the first conversion circuit 230 includes a first upper arm conversion switching element 231,232, a first lower arm conversion switching element 233, 234, and a first conversion connection line 235, 236 that connects both in series. , Is equipped. Both first conversion connection lines 235 and 236 are connected to the positive electrode storage input terminal 34, and both first lower arm conversion switching elements 233 and 234 are connected to the negative electrode storage input terminal 35. The first conversion circuit 230 has first conversion coils 237 and 238 provided on two lines connecting both first conversion connection lines 235 and 236 and the positive electrode storage input terminal 34.

The first conversion switching element 231 to 234 of the present embodiment has a diode that enables a current to flow in the opposite direction. The diode is, for example, a body diode of a MOSFET. However, the present invention is not limited to this, and the diode may be externally attached to the first conversion switching elements 231 to 234.

The first conversion circuit 230 of the present embodiment is a booster circuit that boosts the DC power stored in the power storage device 12. The first conversion circuit 230 includes two circuits including a circuit having a first conversion switching element 231 and 233 and a first conversion coil 237, and a circuit having a first conversion switching element 232 and 234 and a first conversion coil 238. It is a bidirectional converter in which circuits are connected in parallel.

The first conversion circuit 230 performs bidirectional conversion of DC power by periodically turning on / off the first conversion switching elements 231 to 234. For example, the first conversion circuit 230 boosts the DC power stored in the power storage device 12 and outputs it to the AC / DC conversion circuit 200 or the second conversion circuit 240, or the AC / DC conversion circuit 200 or the second conversion. The DC power input from the circuit 240 is stepped down and output to the power storage device 12.

For example, the switching pattern in which the first conversion switching elements 231 and 234 are in the ON state and the first conversion switching elements 232 and 233 are in the OFF state is set as the first pattern, and the first conversion switching elements 231 and 234 are in the OFF state. The switching pattern in which the first conversion switching elements 232 and 233 are in the ON state is defined as the second pattern. In this case, in the first conversion circuit 230, the first conversion switching elements 231 to 234 alternately switch between the first pattern and the second pattern to boost the DC power stored in the power storage device 12. do.

The second conversion circuit 240 has second conversion switching elements 241 to 244. Specifically, the second conversion circuit 240 includes a second upper arm conversion switching element 241,242, a second lower arm conversion switching element 243, 244, and a second conversion connection line 245, 246 that connects both in series. , Is equipped. Both second conversion connection lines 245 and 246 are connected to the positive electrode load input terminal 41, and both second lower arm conversion switching elements 243 and 244 are connected to the negative electrode load input terminal 42. As a result, the second conversion circuit 240 and the vehicle power storage device 21 are connected. The second conversion circuit 240 has second conversion coils 247 and 248 provided on a line connecting both second conversion connection lines 245 and 246 and the positive electrode load input terminal 41.

The second conversion circuit 240 is connected to both the AC / DC conversion circuit 200 and the first conversion circuit 230. Specifically, the power supply device 30 includes a positive electrode wiring LN1 and a negative electrode wiring LN2 that connect the AC / DC conversion circuit 200 and the second conversion circuit 240. The positive side wiring LN1 and the negative side wiring LN2 include a secondary side full bridge circuit 220, a series connection of a second upper arm conversion switching element 241 and a second lower arm conversion switching element 243, a second upper arm conversion switching element 242, and a second upper arm conversion switching element 242. It is connected to the series connector of the second lower arm conversion switching element 244.

The first conversion circuit 230 is connected to the positive electrode wiring LN1 and the negative electrode wiring LN2. In this case, it can be said that the AC / DC conversion circuit 200 and the first conversion circuit 230 are connected to the second conversion circuit 240 in a state of being connected in parallel with each other.

The second conversion circuit 240 is a power conversion circuit, for example, a DC / DC converter circuit that performs voltage conversion of DC power. In the present embodiment, the second conversion circuit 240 is a bidirectional converter capable of bidirectional conversion of DC power. Specifically, the second conversion circuit 240 includes a circuit having a second conversion switching element 241,243 and a second conversion coil 247 connected in series with each other, and a second conversion switching element 242 connected in series with each other. It is a bidirectional converter in which a circuit having 244 and a second conversion coil 248 is connected in parallel.

The second conversion circuit 240 performs bidirectional conversion of DC power by periodically turning on / off the second conversion switching elements 241 to 244. For example, the second conversion circuit 240 steps down at least one of the DC power input from the AC / DC conversion circuit 200 and the DC power input from the first conversion circuit 230 and outputs them to the vehicle power storage device 21. , The DC power stored in the vehicle power storage device 21 is boosted and output to the AC / DC conversion circuit 200 or the first conversion circuit 230.

For example, the switching pattern in which the second conversion switching elements 241,244 are in the ON state and the second conversion switching elements 242 and 243 are in the OFF state is set as the first pattern, and the second conversion switching elements 241,244 are in the OFF state. The switching pattern in which the second conversion switching elements 242 and 243 are in the ON state is defined as the second pattern. In this case, the second conversion circuit 240 performs power conversion by alternately switching the conversion switching elements 241 to 244 between the first pattern and the second pattern.

The intermediate capacitor 110 is provided between the AC / DC conversion circuit 200 and the second conversion circuit 240. Specifically, the intermediate capacitor 110 is connected to the positive electrode wiring LN1 and the negative electrode wiring LN2.

Here, as described above, the first conversion circuit 230 is connected to the positive electrode wiring LN1 and the negative electrode wiring LN2. Therefore, the intermediate capacitor 110 and the first conversion circuit 230 are connected via the positive electrode wiring LN1 and the negative electrode wiring LN2.

In the present embodiment, as shown in FIG. 3, the intermediate capacitor 110 is provided on the second conversion circuit 240 side of the connection point with the first conversion circuit 230 in the positive electrode wiring LN1 and the negative electrode wiring LN2. However, the present invention may be provided on the AC / DC conversion circuit 200 side of the connection point.

The control circuit 120 of the present embodiment includes an AC / DC conversion circuit 200, a first conversion circuit 230 and a second conversion circuit 240, specifically, switching elements 211 to 216, 221 to 224, 231 to 234, 241 to 244. Power is controlled by controlling.

The switching control by the control circuit 120 of this embodiment will be described in detail below. For convenience of explanation, in the following description, the mode in which power is supplied using only the system power P0 among the system modes is set as the first system mode, and both the system power P0 and the power storage device 12 among the system modes are used. The mode in which power is supplied by using the system is referred to as the second system mode.

The control circuit 120 of the present embodiment controls the AC / DC conversion circuit 200 so that the intermediate voltage Vm applied to the intermediate capacitor 110 becomes the intermediate voltage Vm1a at the time of the first supply in the first system mode. .. Specifically, the control circuit 120 sets the primary side switching elements 211 to 216 and the secondary side switching elements 221 to 224 so that the DC power of the first supply intermediate voltage Vm1a is output from the AC / DC conversion circuit 200. PWM control. As a result, the primary side switching elements 211 to 216 and the secondary side switching elements 221 to 224 are periodically turned ON / OFF to perform AC / DC conversion. That is, the control circuit 120 controls the AC / DC conversion circuit 200 so that the system power P0 is converted into the DC power of the first supply intermediate voltage Vm1a.

Here, the first supply-time intermediate voltage Vm1a is set higher than the power supply voltage Vp and the load voltage Vr. As described above, in the present embodiment, the power supply voltage Vp and the load voltage Vr fluctuate, so that the first supply intermediate voltage Vm1a of the present embodiment is set higher than the maximum power supply voltage Vpmax and the maximum load voltage Vrmax. There is.

Specifically, the control circuit 120 calculates the duty ratio of the primary side switching elements 211 to 216 based on the first supply intermediate voltage Vm1a, the turns ratio of the transformer 201, and the like, and the primary side switching is based on the duty ratio. The elements 211 to 216 are periodically turned ON / OFF. Further, the control circuit 120 periodically turns on / off the secondary side switching elements 221 to 224 so that the AC power output from the transformer 201 is converted into DC power. The secondary side full bridge circuit 220 can also be said to be a PWM rectifier circuit that rectifies AC power into DC power by PWM control.

According to this configuration, the AC / DC conversion circuit 200 outputs DC power having an intermediate voltage of Vm1a at the time of first supply. As a result, electric charges are accumulated in the intermediate capacitor 110 by the DC power of the first supply intermediate voltage Vm1a, and the voltage between the positive electrode wiring LN1 and the negative negative wiring LN2 is maintained at the first supply intermediate voltage Vm1a by the intermediate capacitor 110. Will be done. That is, the intermediate capacitor 110 functions to stabilize the voltage in the previous stage of the second conversion circuit 240.

In the first system mode, the control circuit 120 is a second conversion circuit so that the DC power of the first supply intermediate voltage Vm1a output from the AC / DC conversion circuit 200 is converted into the DC power of the load voltage Vr. Control 240. In detail, as described above, the first supply intermediate voltage Vm1a is set higher than the load voltage Vr. Therefore, the control circuit 120 performs step-down conversion of DC power by PWM-controlling the second conversion switching elements 241 to 244. As a result, the DC power of the load voltage Vr converted by the second conversion circuit 240 is input to the vehicle power storage device 21, and the vehicle power storage device 21 is charged.

Incidentally, the control circuit 120 stops the first conversion circuit 230 in the first system mode. Specifically, the control circuit 120 keeps the first conversion switching elements 231 to 234 in the OFF state so that the DC power of the first supply intermediate voltage Vm1a is not supplied to the power storage device 12. That is, when the control circuit 120 is in the first system mode, the control circuit 120 does not perform PWM control on the first conversion circuit 230. Therefore, the first conversion switching elements 231 to 234 do not turn ON / OFF periodically.

The control circuit 120 controls the AC / DC conversion circuit 200 so that the intermediate voltage Vm becomes the intermediate voltage Vm1b at the time of the second supply in the second system mode. Specifically, the control circuit 120 controls the AC / DC conversion circuit 200 so that the system power P0 is converted into the DC power of the second supply intermediate voltage Vm1b. This control mode is the same as in the first system mode.

In the second system mode, the control circuit 120 controls the first conversion circuit 230 so that the power of the power storage device 12 is converted into the DC power of the intermediate voltage Vm1b at the time of the second supply.
Here, the second supply-time intermediate voltage Vm1b is set higher than the power supply voltage Vp and the load voltage Vr. As described above, in the present embodiment, the power supply voltage Vp and the load voltage Vr fluctuate, so that the second supply intermediate voltage Vm1b of the present embodiment is set higher than the maximum power supply voltage Vpmax and the maximum load voltage Vrmax. There is. Therefore, the control circuit 120 performs boost conversion of DC power by PWM controlling the first conversion switching elements 231 to 234. The magnitude relationship between the second supply intermediate voltage Vm1b and the first supply intermediate voltage Vm1a is arbitrary, and may be the same or different, for example.

As described above, the second conversion circuit 240 is connected to both the AC / DC conversion circuit 200 and the first conversion circuit 230. Therefore, both the DC power output from the AC / DC conversion circuit 200 and the DC power output from the first conversion circuit 230 are input to the second conversion circuit 240.

When the control circuit 120 is in the second system mode, the DC power of the second supply intermediate voltage Vm1b output from both the AC / DC conversion circuit 200 and the first conversion circuit 230 is the DC power of the load voltage Vr. The second conversion circuit 240 is controlled so as to be converted to. As a result, the vehicle power storage device 21 is charged.

In the power supply mode, the control circuit 120 supplies power by using the power storage device 12 by periodically turning on / off at least one of the first conversion switching elements 231 to 234 and the second conversion switching elements 241 to 244. I do.

On the other hand, the control circuit 120 stops the AC / DC conversion circuit 200 when it is in the power supply mode. Specifically, the control circuit 120 includes at least one of the primary side switching elements 211 to 216 and the secondary side switching elements 221 to 224 (this) so that the power output from the first conversion circuit 230 does not return to the system power supply 11. In the embodiment, both) are maintained in the OFF state. That is, the control circuit 120 does not perform PWM control on the AC / DC conversion circuit 200 in the power supply mode. Therefore, the primary side switching elements 211 to 216 and the secondary side switching elements 221 to 224 are not periodically turned ON / OFF.

Here, the control circuit 120 repeatedly executes the comparison between the power supply voltage Vp and the load voltage Vr as in the first embodiment, and is based on the comparison result (that is, the magnitude relationship between the power supply voltage Vp and the load voltage Vr). Then, the switching mode in the power supply mode is switched.

Specifically, when the power supply voltage Vp is lower than the load voltage Vr, the control circuit 120 performs the first single control in step S102. The first single control is a single control in which either one of the first conversion switching elements 231 to 234 or the second conversion switching elements 241 to 244 is periodically turned ON / OFF while the other is maintained in the ON state or the OFF state. It is a kind.

The first single control of the present embodiment includes a control of boosting the power of the power storage device 12 by periodically turning on / off the first conversion switching elements 231 to 234. For example, the switching pattern in which the first conversion switching elements 231 and 234 are in the ON state and the first conversion switching elements 232 and 233 are in the OFF state is set as the first pattern, and the first conversion switching elements 231 and 234 are in the OFF state. The switching pattern in which the first conversion switching elements 232 and 233 are in the ON state is defined as the second pattern. In this case, the first conversion circuit 230 boosts the DC power stored in the power storage device 12 by alternately switching the conversion switching elements 231 to 234 between the first pattern and the second pattern. ..

In the first single control, the second conversion switching elements 241 to 244 are turned on or off so that the electric power output from the first conversion circuit 230 is transmitted to the vehicle power storage device 21 via the second conversion circuit 240. Includes control to maintain. Specifically, the control circuit 120 maintains the second conversion switching elements 241,242 in the ON state and the second conversion switching elements 243 and 244 in the OFF state in the first single control.

According to such a configuration, the electric power output from the power storage device 12 is boosted by the first conversion circuit 230 and supplied to the vehicle power storage device 21 through the second conversion circuit 240 without being stepped down. As a result, the vehicle power storage device 21 is charged using the power power storage device 12.

Incidentally, in the first single control, the control circuit 120 adjusts the duty ratio of the first conversion switching elements 231 to 234 based on the required power. As a result, power corresponding to the required power is output from the power storage device 12.

When the power supply voltage Vp is higher than the load voltage Vr, the control circuit 120 performs the second single control, which is a kind of single control, in step S104.
In the second single control of the present embodiment, the first conversion switching elements 231 to 234 are turned on or off so that the power of the power storage device 12 is transmitted to the second conversion circuit 240 via the first conversion circuit 230. Includes control to maintain state. Specifically, the control circuit 120 maintains the first conversion switching elements 231 to 234 in the OFF state in the second single control. As a result, the electric power of the power storage device 12 is transmitted via the body diode of the first conversion switching element 231,232 (in other words, the diode reversely connected in parallel to the first conversion switching element 231,232). Will be done.

The second single control includes a control for stepping down the power of the power storage device 12 by periodically turning on / off the second conversion switching elements 241 to 244. For example, the switching pattern in which the second conversion switching elements 241,244 are in the ON state and the second conversion switching elements 242 and 243 are in the OFF state is set as the first pattern, and the second conversion switching elements 241,244 are in the OFF state. The switching pattern in which the second conversion switching elements 242 and 243 are in the ON state is defined as the second pattern. The control circuit 120 alternately switches the switching patterns of the second conversion switching elements 241 to 244 between the first pattern and the second pattern.

According to such a configuration, the electric power output from the power storage device 12 is input to the second conversion circuit 240 through the first conversion circuit 230 without being boosted, and is stepped down by the second conversion circuit 240. Is supplied to the vehicle power storage device 21. As a result, the vehicle power storage device 21 is charged using the power power storage device 12.

Incidentally, in the second single control, the control circuit 120 adjusts the duty ratios of the second conversion switching elements 241 to 244 based on the required power. As a result, power corresponding to the required power is output from the power storage device 12.

As described above, the control circuit 120 of the present embodiment repeatedly performs the process of comparing the power supply voltage Vp and the load voltage Vr (steps S101 and S103), and based on the comparison result, the first conversion switching elements 231 to 234. The second conversion switching element 241 to 244 is switched to the first single control or the second single control having different switching modes.

The control circuit 120 performs double control when the power supply voltage Vp and the load voltage Vr are the same. The double control is the same as that of the first embodiment. The other processing is the same as that of the first embodiment.

The operation of this embodiment will be described.
When the system mode is set as the mode for supplying power to the vehicle power storage device 21, power is supplied to the vehicle power storage device 21 using at least the system power supply 11. Further, when the power supply mode is set as the mode for supplying the electric power to the vehicle electric power storage device 21, the electric power is supplied to the vehicle electric power storage device 21 using the power electric power storage device 12.

Here, in the power supply mode, the periodic ON / OFF of either the first conversion switching element 231 to 234 or the second conversion switching element 241 to 244 depends on the magnitude relationship between the power supply voltage Vp and the load voltage Vr. The operation stops. As a result, the switching loss is smaller than that of the tabular control in which both the conversion switching elements 231 to 234 and 241 to 244 are periodically turned on and off.

According to the present embodiment described in detail above, the following effects are obtained.
(2-1) The power system 10 includes an AC / DC conversion circuit 200 that converts the system power P0 output from the system power supply 11 into DC power, and a power storage device 12 as a specific power source different from the system power supply 11. , Is equipped. The power system 10 is connected to the power storage device 12, and is connected to both the first conversion circuit 230 having the first conversion switching elements 231 to 234 and the AC / DC conversion circuit 200 and the first conversion circuit 230. A second conversion circuit 240 having two conversion switching elements 241 to 244 is provided. The electric power system 10 is provided between the vehicle power storage device 21 as a load into which the electric power converted by the second conversion circuit 240 is input, the AC / DC conversion circuit 200, and the second conversion circuit 240, and is the first. It also includes an intermediate capacitor 110, which is also connected to the conversion circuit 230.

In such a configuration, the power system 10 includes a control circuit 120 as a control unit that controls power by controlling the AC / DC conversion circuit 200 and both conversion circuits 230 and 240. The control circuit 120 has, as a mode for supplying electric power to the vehicle power storage device 21, a system mode in which power is supplied to the vehicle power storage device 21 by using at least the system power supply 11, and a vehicle using the power power storage device 12. It has a power supply mode for supplying electric power to the power storage device 21.

In the power supply mode, the control circuit 120 is the first conversion switching element 231 to 234 or the second conversion switching element 231 to 234 or the second based on the magnitude relationship between the power supply voltage Vp which is the voltage of the power storage device 12 and the load voltage Vr which is the required voltage of the load. Single control is performed in which one of the conversion switching elements 241 to 244 is periodically turned ON / OFF while the other is maintained in the OFF state.

According to this configuration, the control circuit 120 has a system mode and a power supply mode as modes for supplying electric power to the vehicle power storage device 21, so that the system power supply 11 or the system power supply can be used depending on the situation. Power can be supplied using the power storage device 12 and the power storage device 12, or power can be supplied using only the power power storage device 12. Further, since the single control is performed in the power supply mode, the switching loss is reduced as compared with the configuration in which both the first conversion switching elements 231 to 234 and the second conversion switching elements 241 to 244 are periodically turned on / off. Can be planned.

(2-2) The power supply device 30 includes an AC / DC conversion circuit 200, a first conversion circuit 230, a second conversion circuit 240, an intermediate capacitor 110, and a control circuit 120, and is a second conversion circuit. It is used to supply the electric power converted by 240 to the vehicle power storage device 21 as a load. The control circuit 120 has a system mode and a power supply mode as modes for supplying electric power to the vehicle power storage device 21. The control circuit 120 performs single control in the power supply mode. As a result, the effect of (2-1) is achieved.

(2-3) In the power supply mode, the control circuit 120 performs the first single control when the power supply voltage Vp is lower than the load voltage Vr. In the first single control, the first conversion switching elements 231 to 234 are periodically turned ON / OFF to boost the power of the power storage device 12, while the power output from the first conversion circuit 230 is the second conversion circuit. This is a control for maintaining the second conversion switching elements 241 to 244 in the ON state or the OFF state so as to be transmitted to the vehicle power storage device 21 via 240.

According to this configuration, when the power supply voltage Vp is lower than the load voltage Vr, the first conversion switching elements 231 to 234 are periodically turned ON / OFF, so that the power output from the power storage device 12 is generated. It is boosted by the first conversion circuit 230. Then, the boosted electric power is transmitted to the vehicle power storage device 21 via the second conversion circuit 240. As a result, DC power having a voltage closer to the load voltage Vr than the power supply voltage Vp can be supplied to the vehicle power storage device 21.

In this case, it is not necessary to step down the DC power output from the first conversion circuit 230 by the second conversion circuit 240. Therefore, by maintaining the second conversion switching elements 241 to 244 in the ON state or the OFF state, the switching loss of the second conversion switching elements 241 to 244 can be reduced.

(2-4) In the power supply mode, the control circuit 120 performs the second single control when the power supply voltage Vp is higher than the load voltage Vr. The second single control maintains the first conversion switching elements 231 to 234 in the ON state or the OFF state so that the electric power of the power storage device 12 is transmitted to the second conversion circuit 240 via the first conversion circuit 230. On the other hand, the control is such that the second conversion switching elements 241 to 244 are periodically turned ON / OFF to lower the power of the power storage device 12.

According to this configuration, when the power supply voltage Vp is higher than the load voltage Vr, the first conversion switching elements 231 to 234 are maintained in the ON state or the OFF state, and the power of the power storage device 12 is boosted. It is input to the second conversion circuit 240 through the first conversion circuit 230. Then, by periodically turning on / off the second conversion switching elements 241 to 244, the electric power input to the second conversion circuit 240 is stepped down, and the stepped down electric power is supplied to the vehicle power storage device 21. .. As a result, electric power having a voltage closer to the load voltage Vr than the power supply voltage Vp can be supplied to the vehicle power storage device 21. In this case, since the first conversion switching elements 231 to 234 are maintained in the ON state or the OFF state, the switching loss of the first conversion switching elements 231 to 234 can be reduced.

(2-5) The control circuit 120 repeats the process of comparing the power supply voltage Vp and the load voltage Vr (steps S101 and S103), and based on the comparison result, the first conversion switching elements 231 to 234 and the second The conversion switching elements 241 to 244 are switched to the first single control or the second single control having different switching modes.

According to this configuration, the vehicle power storage device 21 is charged using the electric power stored in the power power storage device 12 in the power supply mode. In this case, since the power supply voltage Vp and the load voltage Vr change as the SOCs of both power storage devices 12 and 21 change, the magnitude relationship between the two can also change.

In this regard, according to the present embodiment, the comparison between the power supply voltage Vp and the load voltage Vr is repeatedly performed during the power supply mode, and the switching modes of both switching elements 231 to 234 and 241 to 244 are switched based on the comparison result. .. Thereby, it is possible to cope with the change in the magnitude relationship between the power supply voltage Vp and the load voltage Vr that may occur due to the charging of the vehicle power storage device 21 using the power storage device 12.

(2-6) The system mode is a first system mode in which power is supplied to the vehicle power storage device 21 using the system power supply 11, and a vehicle power storage device 21 using the system power supply 11 and the power storage device 12. It has a second system mode for supplying electric power.

The control circuit 120 controls the AC / DC conversion circuit 200 so that the intermediate voltage Vm applied to the intermediate capacitor 110 becomes the first supply intermediate voltage Vm1a in the first system mode, and the first supply intermediate. The second conversion circuit 240 is controlled so that the DC power of the voltage Vm1a is converted into the power of the load voltage Vr.

Further, the control circuit 120 controls the AC / DC conversion circuit 200 so that the intermediate voltage Vm becomes the intermediate voltage Vm1b at the time of the second supply in the second system mode, and the electric power of the power storage device 12 is supplied to the second. The first conversion circuit 230 is controlled so as to be converted into DC power having an intermediate voltage of Vm1b. Then, the control circuit 120 controls the second conversion circuit 240 so that the DC power of the second supply intermediate voltage Vm1b is converted into the power of the load voltage Vr.

According to such a configuration, in the first system mode, the system power P0 is converted into the DC power of the first supply intermediate voltage Vm1a by the AC / DC conversion circuit 200. Further, the DC power of the first supply intermediate voltage Vm1a is converted into the power of the load voltage Vr by the second conversion circuit 240 and supplied to the vehicle power storage device 21. As a result, the system power supply 11 can be used to supply electric power to the vehicle power storage device 21.

Further, in the second system mode, the system power P0 is converted into the DC power of the intermediate voltage Vm1b at the time of the second supply by the AC / DC conversion circuit 200, and the power of the power storage device 12 is converted by the first conversion circuit 230. 2 When supplied, it is converted into DC power with an intermediate voltage of Vm1b. Then, the DC power of the second supply intermediate voltage Vm1b is converted into the power of the load voltage Vr by the second conversion circuit 240 and supplied to the vehicle power storage device 21. In this case, since both the system power P0 and the power of the power storage device 12 are once converted into the DC power of the intermediate voltage Vm1b at the time of the second supply, the system power P0 and the power of the power storage device 12 are different voltages. Even if it is of the type (AC / DC), it is possible to supply electric power to the vehicle power storage device 21 by using both the system power supply 11 and the power storage device 12.

(2-7) The second supply intermediate voltage Vm1b is set higher than the power supply voltage Vp and the load voltage Vr, which are the voltages of the power storage device 12.
According to this configuration, in the second system mode, the power supply voltage Vp is boosted to the second supply intermediate voltage Vm1b by the first conversion circuit 230, and then the second supply intermediate voltage Vm1b is boosted to the load voltage by the second conversion circuit 240. It is stepped down to Vr. As a result, power can be supplied to the vehicle power storage device 21 using the power power storage device 12 regardless of the magnitude relationship between the power supply voltage Vp and the load voltage Vr.

Each of the above embodiments may be changed as follows. Further, each of the above-described embodiments and the following alternative examples may be appropriately combined as long as there is no technical contradiction.
○ The number of step-up switching elements is arbitrary, and may be, for example, one. Further, in the first single control when there are a plurality of step-up switching elements, at least a part of the plurality of step-up switching elements may be periodically turned ON / OFF so that the step-up operation is performed. The same applies to the primary side switching element and the step-down switching element.

○ The primary side circuit 80 may be AC / AC converted, and its specific configuration is not limited to that of the embodiment and is arbitrary.
○ The booster circuit 90 is configured to be capable of converting AC power output (in other words, transmitted) from the first transformer 60 into DC power and boosting the power output from the power storage device 12. The specific configuration is arbitrary.

○ The step-down circuit 100 only needs to be able to step down the DC power output from the step-up circuit 90 via the intermediate capacitor 110, and its specific configuration is arbitrary.
○ The specific circuit configuration of the AC / DC conversion circuit 200 is not limited to that of the embodiment and is arbitrary. For example, the AC / DC conversion circuit 200 is not limited to a configuration capable of bidirectional conversion of AC power, and may be a one-way conversion circuit that converts system power P0 into DC power. As an example, the AC / DC conversion circuit 200 may be a rectifier circuit having a diode bridge instead of the primary side matrix converter 210 and the transformer 201. Further, the AC / DC conversion circuit 200 may have a configuration having a half bridge circuit or a diode bridge circuit instead of the secondary side full bridge circuit 220. In short, the AC / DC conversion circuit 200 only needs to be able to convert the system power P0 into DC power having a desired voltage.

○ Further, the specific power supply may have a constant output voltage. That is, the power supply voltage Vp may be a fluctuating value or a fixed value.
○ The specific circuit configuration of the first conversion circuit 230 is arbitrary as long as the power of the power storage device 12 can be converted into a voltage. For example, the first conversion circuit 230 may have a configuration having a half-bridge circuit. Further, the first conversion circuit 230 is not limited to the bidirectional converter, and may be configured to perform only one-way voltage conversion.

The specific circuit configuration of the second conversion circuit 240 is arbitrary as long as the DC power input from the AC / DC conversion circuit 200 or the first conversion circuit 230 can be voltage-converted. Further, the second conversion circuit 240 can convert the DC power input from the AC / DC conversion circuit 200 or the first conversion circuit 230 into a voltage, but cannot convert the power of the vehicle power storage device 21 into a voltage. It may be a circuit. That is, the second conversion circuit 240 may be configured to perform only one-way voltage conversion.

○ The load is not limited to the vehicle power storage device 21, and may be any, for example, an industrial motor. In this case, the load voltage Vr is, for example, the voltage required to drive an industrial motor. That is, when a drive device is used as a load, the load voltage Vr can be said to be the voltage required to drive the drive device. When the load is an AC drive body such as a motor, the step-down circuit 100 and the second conversion circuit 240 may be inverter circuits that convert DC power into AC power. That is, the step-down circuit 100 and the second conversion circuit 240 may be a DC / DC converter circuit or an inverter circuit.

○ The power supply device 30 may include a power storage device 12.
○ The specific power source is not limited to the power storage device 12, and may be any, for example, a solar power generation device having a solar panel or a generator. In this case, the output voltage of the photovoltaic power generation device or the output voltage of the generator may be adopted as the power supply voltage Vp, which is the voltage of the specific power source. When a generator is used as a specific power source, the power supply device 30 may have an inverter. Further, in the second embodiment, the first conversion circuit 230 may convert the AC power output from the generator into DC power.

○ The number of specific power supplies is arbitrary, and may be two or more. That is, the specific power supply includes both one case and a plurality of cases. In this case, the electric power system 10 may be configured to supply electric power to the vehicle power storage device 21 by using a part of the specific power sources and the system power source 11 among the plurality of specific power sources, or the system with all the plurality of specific power sources. The power supply 11 may be used to supply electric power to the vehicle power storage device 21. That is, when the power system 10 has a plurality of specific power sources, the system mode is a mode in which the system power source 11 or at least one of the system power source 11 and the plurality of specific power sources is used to supply power to the load. All you need is.

○ Either one of the first system mode and the second system mode may be omitted.
○ The power storage device 12 may be a part of the power supply device 30. That is, the power supply device 30 may or may not include the power storage device 12.

○ Either the first single control or the second single control may be omitted. For example, in the first embodiment, in step S102, instead of the first single control, the control circuit 120 periodically turns on / off both switching elements 92 to 95 and 102 to 105 to perform step-up and step-down. Double control to do both may be performed. Further, in step S104, the control circuit 120 periodically turns on / off both switching elements 92 to 95 and 102 to 105 instead of the second single control to perform both step-up and step-down control. It may be configured to perform. When the control circuit 120 performs double control, the intermediate voltage Vm is preferably higher than both the power supply voltage Vp and the load voltage Vr. The same applies to the second embodiment.

Next, a suitable example that can be grasped from each of the above embodiments and another example will be described below.
(A) When the voltage of the specific power supply is lower than the required voltage of the load, the single control unit cycles both the first secondary side switching element and the first secondary side switching element. Double control may be performed to turn it on and off.

(B) When the voltage of the specific power supply is higher than the required voltage of the load, the single control unit cycles both the first secondary side switching element and the second secondary side switching element. Double control may be performed to turn it on and off.

(C) The first conversion switching element may have a diode that is reversely connected in parallel to the first conversion switching element.
(C) The control unit uses both the first system mode in which power is supplied to the load by using the system power supply and both the system power supply and the specific power supply as modes for supplying power to the load. When there is a second system mode for supplying power to the load and the mode for supplying power to the load is the first system mode, the intermediate voltage applied to the intermediate capacitor is the first. The AC / DC conversion circuit is controlled so that the supply intermediate voltage is obtained, and the second conversion circuit is controlled so that the DC power of the first supply intermediate voltage is converted into the power of the load voltage. When the power control mode is the second system mode, the AC / DC conversion circuit is controlled so that the intermediate voltage becomes the second supply intermediate voltage, and the power of the specific power supply is the second supply intermediate. The first conversion circuit is controlled so that the DC power of the voltage is converted, and the second conversion circuit is controlled so that the DC power of the intermediate voltage at the time of the second supply is converted into the power of the load voltage. It is good to do.

(D) The second supply intermediate voltage may be set higher than the power supply voltage and the load voltage, which are the voltages of the specific power supply.

10 ... Power system, 11 ... System power supply, 12 ... Power storage device, 20 ... Vehicle, 21 ... Vehicle power storage device, 30 ... Power supply device, 31-33 ... System input terminal, 34, 35 ... Power storage input terminal, 40 ... connector, 41, 42 ... load input terminal, 43 ... control terminal, 50 ... filter circuit, 60 ... first transformer, 61 ... first primary winding, 62 ... first secondary winding, 62a ... 1st midpoint tap, 70 ... 2nd transformer, 71 ... 2nd primary winding, 72 ... 2nd secondary winding, 72a ... 2nd midpoint tap, 80 ... primary side circuit , 82ua-82wb ... primary side switching element, 90 ... step-up circuit (first secondary side circuit), 92-95 ... step-up switching element, 100 ... step-down circuit (second secondary side circuit), 102-105 ... Step-down switching element, 110 ... Intermediate capacitor, 120 ... Control circuit (control unit), 121 ... Power supply voltage sensor, 122 ... Load voltage sensor, 200 ... AC / DC conversion circuit, 230 ... First conversion circuit, 231 to 234 ... 1st conversion switching element, 240 ... 2nd conversion circuit, 241-244 ... 2nd conversion switching element, P0 ... system power, Vm ... intermediate voltage, Vp ... power supply voltage (voltage of power storage device), Vr ... load voltage (Required voltage of load).

Claims (12)

A grid power supply and a specific power supply different from the grid power supply,
Load and
A first transformer with a first primary winding and a first secondary winding having a midpoint tap to which the particular power supply is connected.
A second winding with a second primary winding connected in series with the first primary winding and a second secondary winding with a midpoint tap to which the load is connected. With a transformer
A primary side circuit having a primary side switching element connected to the system power supply and connected to a series connection body of the first primary side winding and the first secondary side winding.
A first secondary coil provided between the midpoint tap of the first secondary winding and the specific power supply, and a first two connected to the first secondary winding. A first secondary circuit having a secondary switching element,
A second secondary coil connected to the first secondary circuit and provided between the midpoint tap of the second secondary winding and the load, and the said. A second secondary circuit having a second secondary switching element connected to the second secondary winding, and a second secondary circuit.
An intermediate capacitor provided between the first secondary circuit and the second secondary circuit,
A control unit that controls the primary side circuit, the first secondary side circuit, and the second secondary side circuit.
With
The control unit is used as a mode for supplying electric power to the load.
By periodically turning on / off the primary side switching element, the first secondary side switching element, and the second secondary side switching element, power is supplied to the load by using at least the system power supply. System mode to perform and
A power supply mode in which power is supplied to the load using the specific power supply by periodically turning on / off at least one of the first secondary side switching element and the second secondary side switching element. ,
With
In the power supply mode, the control unit is either the first secondary side switching element or the second secondary side switching element based on the magnitude relationship between the voltage of the specific power supply and the required voltage of the load. A power system including a single control unit that periodically turns one of them on and off while keeping the other on or off. When the voltage of the specific power supply is lower than the required voltage of the load, the single control unit periodically turns on / off the first secondary side switching element, while the second secondary side. The power system according to claim 1, wherein the switching element is maintained in an ON state or an OFF state. The second secondary side circuit is a second secondary side upper arm switching element and a second secondary side upper arm switching element connected to the first secondary side circuit via the intermediate capacitor as the second secondary side switching element. It has a second secondary lower arm switching element and
The second secondary side upper arm switching element and the second secondary side lower arm switching element are connected to each other by a second secondary side connecting line connected to the second secondary side winding. And
When the voltage of the specific power supply is lower than the required voltage of the load, the single control unit periodically turns on / off the first secondary side switching element, while the single control unit periodically turns on / off the second secondary side. The power system according to claim 2, wherein the first single control is performed in which the upper arm switching element is maintained in the ON state and the second secondary side lower arm switching element is maintained in the OFF state. When the voltage of the specific power supply is higher than the required voltage of the load, the single control unit periodically turns on / off the second secondary side switching element, while the single control unit periodically turns on / off the first secondary side. The power system according to any one of claims 1 to 3, wherein the switching element is maintained in an ON state or an OFF state. The first secondary side circuit is a first secondary side upper arm switching element and a first secondary side upper arm switching element connected to the second secondary side circuit via the intermediate capacitor as the first secondary side switching element. It has a first secondary lower arm switching element and
The first secondary side upper arm switching element and the first secondary side lower arm switching element are connected to each other by a first secondary side connecting line connected to the first secondary side winding. And
When the voltage of the specific power supply is higher than the required voltage of the load, the single control unit periodically turns on / off the second secondary side switching element, while the single control unit periodically turns on / off the first secondary side. The power system according to claim 4, wherein a second single control is performed in which the upper arm switching element is maintained in the ON state and the first secondary side lower arm switching element is maintained in the OFF state. The specific power source is a power storage device, and the specific power source is a power storage device.
The load is a vehicle power storage device.
The power system
A power supply voltage sensor that detects the voltage of the power storage device as the voltage of the specific power supply, and
A required voltage sensor that detects the voltage of the vehicle power storage device as the required voltage of the load, and
With
The single control unit includes a comparison unit that repeatedly compares the voltages of both power storage devices during the power supply mode, and based on the comparison result of the comparison unit, the first secondary side switching element and the second secondary side switching element. The power system according to any one of claims 1 to 5, wherein the switching mode of the secondary switching element is switched. A power supply device that supplies power to a load using a grid power supply and a specific power supply different from the grid power supply.
A first transformer with a first primary winding and a first secondary winding having a midpoint tap to which the particular power supply is connected.
A second winding with a second primary winding connected in series with the first primary winding and a second secondary winding with a midpoint tap to which the load is connected. With a transformer
A primary side circuit having a primary side switching element connected to the system power supply and connected to a series connection body of the first primary side winding and the first secondary side winding.
A first secondary coil provided between the midpoint tap of the first secondary winding and the specific power supply, and a first two connected to the first secondary winding. A first secondary circuit having a secondary switching element,
A second secondary coil connected to the first secondary circuit and provided between the midpoint tap of the second secondary winding and the load, and the said. A second secondary circuit having a second secondary switching element connected to the second secondary winding, and a second secondary circuit.
An intermediate capacitor provided between the first secondary circuit and the second secondary circuit,
A control unit that controls the primary side circuit, the first secondary side circuit, and the second secondary side circuit.
With
The control unit is used as a mode for supplying electric power to the load.
By periodically turning on / off the primary side switching element, the first secondary side switching element, and the second secondary side switching element, power is supplied to the load by using at least the system power supply. System mode to perform and
A power supply mode in which power is supplied to the load using the specific power supply by periodically turning on / off at least one of the first secondary side switching element and the second secondary side switching element. ,
With
In the power supply mode, the control unit is either the first secondary side switching element or the second secondary side switching element based on the magnitude relationship between the voltage of the specific power supply and the required voltage of the load. A power supply device including a single control unit that periodically turns one of them on and off while keeping the other on or off. An AC / DC conversion circuit that converts the system power output from the system power supply into DC power,
With a specific power supply different from the system power supply,
A power conversion circuit connected to the specific power supply, the first conversion circuit having the first conversion switching element, and the first conversion circuit.
A power conversion circuit connected to both the AC / DC conversion circuit and the first conversion circuit, the second conversion circuit having the second conversion switching element, and the second conversion circuit.
The load to which the power converted by the second conversion circuit is input and
An intermediate capacitor provided between the AC / DC conversion circuit and the second conversion circuit and connected to the first conversion circuit, and
A control unit that controls power by controlling the AC / DC conversion circuit, the first conversion circuit, and the second conversion circuit.
With
The control unit is used as a mode for supplying electric power to the load.
A system mode in which power is supplied to the load using at least the system power supply, and
A power supply mode in which power is supplied to the load using the specific power supply, and
With
In the power supply mode, the control unit periodically switches either the first conversion switching element or the second conversion switching element based on the magnitude relationship between the voltage of the specific power supply and the required voltage of the load. A power system including a single control unit that turns ON / OFF while maintaining the other ON or OFF state. When the voltage of the specific power supply is lower than the required voltage of the load, the single control unit periodically turns on / off the first conversion switching element to boost the power of the specific power supply, while the single control unit boosts the power of the specific power supply. 8. Claim 8 of performing the first single control for maintaining the second conversion switching element in the ON state or the OFF state so that the electric power output from the first conversion circuit is transmitted to the load via the second conversion circuit. The power system described in. When the voltage of the specific power supply is higher than the required voltage of the load, the single control unit causes the power of the specific power supply to be transmitted to the second conversion circuit via the first conversion circuit. 8. Item 9. The electric power system according to Item 9. The specific power source is a power storage device, and the specific power source is a power storage device.
The load is a vehicle power storage device.
The power system
A power supply voltage sensor that detects the voltage of the power storage device as the voltage of the specific power supply, and
A required voltage sensor that detects the voltage of the vehicle power storage device as the required voltage of the load, and
With
The single control unit includes a comparison unit that repeatedly compares the voltages of both power storage devices during the power supply mode, and based on the comparison result of the comparison unit, the first conversion switching element and the second conversion switching element. The power system according to any one of claims 8 to 10, wherein the switching mode is switched. An AC / DC conversion circuit that converts the system power output from the system power supply into DC power,
A power conversion circuit connected to a specific power supply different from the system power supply, the first conversion circuit having the first conversion switching element, and the first conversion circuit.
A power conversion circuit connected to both the AC / DC conversion circuit and the first conversion circuit, the second conversion circuit having the second conversion switching element, and the second conversion circuit.
An intermediate capacitor provided between the AC / DC conversion circuit and the second conversion circuit and connected to the first conversion circuit, and
A control unit that controls power by controlling the AC / DC conversion circuit, the first conversion circuit, and the second conversion circuit.
It is a power supply device used to supply the power converted by the second conversion circuit to the load.
The control unit is used as a mode for supplying electric power to the load.
A system mode in which power is supplied to the load using at least the system power supply, and
A power supply mode in which power is supplied to the load using the specific power supply, and
With
In the power supply mode, the control unit periodically switches either the first conversion switching element or the second conversion switching element based on the magnitude relationship between the voltage of the specific power supply and the required voltage of the load. A power supply device including a single control unit that turns ON / OFF while maintaining the other in an ON state or an OFF state.

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