JP2022089581A - Power supply system - Google Patents

Abstract

To provide a power supply system that facilitates reduction in electricity charge.SOLUTION: A power supply system is provided with: a first conversion part 11 switchable to a first high voltage VH1 and a first low voltage VL1; a second conversion part 12 switchable to a second high voltage VH2 and a second low voltage VL2; a regulation part 13 that regulates a current from the first conversion part 11 toward the second conversion part 12; and a power storage part 30 whose power storage voltage VB is lower than the first high voltage VH1 and the second high voltage VH2 and higher than the first low voltage VL1 and the second low voltage VL2. Each of the first conversion part 11 and the second conversion part 12 is configured to operate in a first mode of outputting DC power at the first high voltage VH1 and the second high voltage VH2, a second mode of outputting the DC power at the first low voltage VL1 and the second low voltage VL2, and a third mode of outputting the DC power at the first high voltage VH1 and the second low voltage VL2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power supply system suitable for use in supplying DC power.

As a conventional power supply system having a power storage unit, a DC power supply unit and a charging / spare unit (hereinafter, also referred to as “charging unit”) are known to be provided (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-406454

In the above-mentioned power supply system, for example, charge / discharge control for switching between a "charging mode" in which the power storage unit is charged by raising and lowering the voltage of the direct delivery unit and the charging unit at the same time and a "discharge mode" in which the power storage unit is discharged is performed. It is done.

However, since it is not assumed that charging is not performed after discharging the power storage unit, control is always performed to charge after discharging. Therefore, there is a problem that it is difficult to charge the power storage unit at an arbitrary time after discharging.

The present invention has been made to solve the above-mentioned problems, and provides a power supply system capable of easily reducing electricity charges by enabling charging of a power storage unit at an arbitrary time after discharge. The purpose is.

In order to achieve the above object, the present invention provides the following means.
The power supply system of the present invention converts AC power into DC power and outputs it to a load, and outputs the output DC power to a first high voltage and a first low voltage voltage lower than the first high voltage. A first conversion unit that can be switched between the two is arranged in parallel with the first conversion unit, the AC power is converted into the DC power, and the output DC power voltage is the second high voltage and the above. A second conversion unit that can be switched between a second low voltage voltage having a voltage lower than the second high voltage voltage is arranged between the DC power side of the first conversion unit and the DC power side of the second conversion unit. A regulation unit that allows a current flow from the second conversion unit to the first conversion unit and regulates a current flow from the first conversion unit to the second conversion unit, and a DC voltage of the second conversion unit. The stored voltage, which is the voltage of the power that is electrically connected to the power side and is output, is lower than the first high voltage and the second high voltage, and the first low voltage and the second low voltage are A storage unit having a higher voltage than the above is provided, and the first conversion unit and the second conversion unit each have a first mode of outputting DC power at the first high voltage and the second high voltage, respectively. It is configured to be operable in a second mode in which DC power is output at the first low voltage and the second low voltage, and a third mode in which DC power is output at the first high voltage and the second low voltage, respectively.

According to the power supply system of the present invention, the first conversion unit and the second conversion unit can be operated in the first mode, the second mode, and the third mode, so that the storage unit can be stored at an arbitrary time after the discharge. It becomes possible to charge the unit.

Here, in the first mode in which the first conversion unit and the second conversion unit output DC power at the first high voltage and the second high voltage, respectively, the load is supplied with power and the power storage unit is charged. Will be. In the second mode in which the first conversion unit and the second conversion unit output DC power at the first low voltage and the second low voltage, respectively, the power discharged from the power storage unit is supplied to the load. In the third mode in which the first conversion unit and the second conversion unit output DC power at one high voltage and a second low voltage, respectively, power is supplied to the load while charging to the power storage unit is suppressed. ..

Therefore, in the power supply system of the present invention, after the power storage unit discharges in the second mode, the load is supplied in the third mode until the power storage unit is supplied with power, and the charging of the power storage unit is suppressed. be able to. By the first mode after the third mode, the load can be supplied and the power storage unit can be charged.

In the above invention, the second high voltage is preferably a voltage lower than the first high voltage, and the second low voltage is preferably a voltage equal to or higher than the first low voltage.
By setting the second high-voltage voltage to a voltage lower than the first high-voltage voltage in this way, it becomes easy to achieve both power supply to the load and charging to the power storage unit in the first mode.

Since the stored voltage output from the power storage unit is lower than the first high voltage voltage output from the first conversion unit in the third mode, it is easy to suppress the discharge from the power storage unit to the load in the third mode. Further, by setting the second low voltage to a voltage equal to or lower than the first low voltage, it becomes easy to discharge the load from the power storage unit in the second mode.

In the above invention, a control signal is output to the first conversion unit and the second conversion unit based on a predetermined schedule stored in the storage unit, and the first mode, the second mode, and the second mode are described. It is preferable that a control unit for controlling the switching of the third mode is further provided.

By performing switching control between the first mode, the second mode, and the third mode based on the predetermined schedule in this way, for example, even in an environment where it is difficult to perform switching control from the outside of the power supply system. , Switching control can be performed.

In the above invention, a control signal is given to the first conversion unit and the second conversion unit based on the switching input of the first mode, the second mode, and the third mode input via the input reception unit. Is output, and it is preferable that a control unit for controlling switching between the first mode, the second mode, and the third mode is further provided.

By performing switching control between the first mode, the second mode, and the third mode based on the switching input input in this way, for example, switching control is performed based on a predetermined schedule stored in the storage unit. Compared with the case, it becomes easier to perform switching control flexibly. For example, it becomes easy to appropriately change the timing of performing the first mode, the second mode, and the third mode, and the period for continuing each mode, depending on the surrounding situation.

According to the power supply system of the present invention, the first conversion unit and the second conversion unit can be operated in the first mode, the second mode, and the third mode, so that the storage unit can be stored at an arbitrary time after the discharge. It becomes possible to charge the unit. Therefore, regardless of the time when the power storage unit is discharged, it is possible to charge the power storage unit during the time when the power charge is low, which has the effect of facilitating the reduction of the electricity charge.

In the above invention, it is preferable that the power storage unit is provided with an information transmission unit that transmits information about the power storage unit to the control unit.
By providing the information transmission unit in this way, information about the power storage unit is input to the control unit. The control unit can perform switching control while referring to information about the power storage unit. Here, as the information regarding the power storage unit, information such as the voltage in the power storage unit, the current during charging / discharging, and the remaining capacity can be exemplified.

It is a schematic diagram explaining the power supply system which concerns on one Embodiment of this invention. It is a block diagram explaining the structure of the main control part of FIG. It is a schematic diagram explaining the flow of DC power in the 1st mode. It is a graph explaining the time change of each voltage in the 1st mode. It is another graph explaining the time change of each voltage in the 1st mode. It is a schematic diagram explaining the flow of DC power in the 2nd mode. It is a graph explaining the time change of each voltage in the 2nd mode. It is a schematic diagram explaining the flow of DC power in a 3rd mode. It is a graph explaining the time change of each voltage in the 3rd mode. It is a schematic diagram explaining another example of the power-source system of this invention. It is a block diagram explaining the structure of the main control part of FIG.

The power supply system 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 11.
As shown in FIG. 1, the power supply system 1 is a system that supplies power to a load 40 that consumes electric power. In this embodiment, an example of a system in which AC power is converted into DC power having a desired voltage and supplied to the load 40 will be described. The power supply system 1 may be a system that converts DC power into DC power having a desired voltage and supplies it to the load 40.

In this embodiment, it will be described by applying it to an example in which the load 40 is a communication facility. The load 40 is not limited to the communication equipment, and may be any other device that consumes various electric powers.

As shown in FIG. 1, the power supply system 1 is mainly provided with a power supply device 10 and a power storage unit 30.
The power supply device 10 converts AC power into DC power having a desired voltage and supplies it to the load 40. In the present embodiment, the AC power will be described by applying it to an example in which the AC power is supplied from the commercial power source 50 to the power supply device 10, but the AC power may be supplied by means other than the commercial power source 50.

Further, the power supply device 10 supplies DC power stored in the power storage unit 30. Further, the power supply device 10 supplies the DC power discharged from the power storage unit 30 to the load 40 when the supply of the AC power to the power supply device 10 is stopped.

As shown in FIG. 1, the power supply device 10 is mainly provided with a first conversion unit 11, a second conversion unit 12, a regulation unit 13, and a main control unit (control unit) 21. In this embodiment, the first conversion unit 11 and the second conversion unit 12 will be described by applying to an example in which the first conversion unit 11 and the second conversion unit 12 are arranged in parallel inside the power supply device 10.

Further, the first conversion unit 11 may be one unit or a plurality of units. The second conversion unit 12 may be one unit or a plurality of units. In this embodiment, an example in which each of the first conversion unit 11 and the second conversion unit 12 is a plurality of units will be described.

Specifically, a plurality of first conversion units 11 are arranged in parallel, and a plurality of second conversion units 12 are arranged in parallel. Then, a plurality of groups of the first conversion unit 11 and a plurality of groups of the second conversion unit 12 are arranged in parallel.

The first conversion unit 11 is a converter that converts AC power input to the power supply device 10 into DC power and outputs it to the load 40. The first conversion unit 11 sets the output DC voltage based on the control signal input from the main control unit 21 to the first low voltage voltage VL1 whose voltage is lower than the first high voltage voltage VH1 and the first high voltage voltage VH1. It has a configuration to switch between.

The second conversion unit 12 is a converter that converts AC power input to the power supply device 10 into DC power and outputs it to the power storage unit 30. The second conversion unit 12 sets the output DC voltage based on the control signal input from the main control unit 21 to a second low voltage voltage VL2 having a voltage lower than that of the second high voltage voltage VH2 and the second high voltage voltage VH2. It has a configuration to switch between.

The second high voltage VH2 is a voltage lower than the first high voltage VH1, and the second low voltage VL2 is a voltage lower than the second high voltage VH2 and a voltage equal to or higher than the first low voltage VL1. .. That is, the high-low relationship of the voltage is as follows. 1st high voltage voltage VH1> 2nd high voltage voltage VH2> 2nd low voltage voltage VL2 ≧ 1st low voltage voltage VL1.

In this embodiment, the value of the first high voltage voltage VH1 will be described by applying it to an example in which the value of the first high voltage voltage VH1 is higher than the value of the second high voltage voltage VH2. There may be.

As the first conversion unit 11 and the second conversion unit 12, a converter having a known configuration can be used, and the type of the converter, the power conversion method, the voltage switching method, and the like are particularly limited. It's not a thing.

The regulation unit 13 is an electronic component arranged between the DC power side of the first conversion unit 11 group and the DC power side of the second conversion unit 12 group. The regulating unit 13 is an electronic component that allows the current flow from the second conversion unit 12 group to the first conversion unit 11 group and regulates the current flow from the first conversion unit 11 group to the second conversion unit 12 group. Is. In this embodiment, the present invention will be described by applying it to an example in which the regulation unit 13 is a diode.

The main control unit 21 outputs a control signal for controlling the voltage of the DC power to be output to the first conversion unit 11 and the second conversion unit 12, respectively. In this embodiment, the main control unit 21 will be described by applying it to an example of a microcomputer having a CPU (central processing unit), a ROM, a RAM, an input / output interface, and the like.

As shown in FIG. 2, the program stored in the storage device such as the ROM described above has the CPU (central processing unit), ROM, RAM, input / output interface, etc. linked to the arithmetic unit 22 and input reception. It functions as a unit 23. In FIG. 2, the representatives of the first conversion unit 11 and the second conversion unit 12 are shown one by one for easy understanding.

The arithmetic unit 22 generates a control signal for controlling the first conversion unit 11 and the second conversion unit 12. The control signals are the first mode M1 for causing the first conversion unit 11 and the second conversion unit 12 to output DC power at the first high voltage voltage VH1 and the second high voltage voltage VH2, respectively, and the first low voltage voltage VL1 and the first, respectively. 2 There are at least three types of signals in the second mode M2 that outputs DC power at the low voltage VL2 and the third mode M3 that outputs DC power at the first high voltage VH1 and the second low voltage VL2, respectively.

The first mode M1 is a mode in which DC power is supplied to the load 40 and the power storage unit 30 is charged. The second mode M2 is a mode in which the power supply from the commercial power source 50 to the load 40 is stopped and the DC power discharged from the power storage unit 30 is supplied to the load 40. The third mode M3 is a mode in which DC power is supplied to the load 40 and charging of the power storage unit 30 is suppressed.

The input receiving unit 23 inputs a switching signal for switching between the first mode M1, the second mode M2, and the third mode M3. The input receiving unit 23 is connected so that the input switching signal can be output to the calculation unit 22.

Further, as shown in FIG. 1, the input receiving unit 23 may include an information terminal such as a personal computer via an external network 26 capable of information communication, a BEMS (Building Energy Management System), a CEMS (Community Energy Management System), or the like. The switching signal is input from the input unit 25 of.

The external network 26 may be a network installed outside the power supply system 1 and may be any of a wired information communication, a wireless information communication, and a network that performs wired and wireless information communication.

In this embodiment, the input receiving unit 23 will be described by applying it to an example in which the input receiving unit 23 is connected to the input unit 25 via the external network 26 so as to be capable of information communication. However, the input receiving unit 23 does not go through the external network. It may be directly connected to the input unit 25 so that information can be communicated.

The power storage unit 30 charges the DC power and discharges the stored DC power. The DC power to be charged is output from the second conversion unit 12. The discharged DC power is supplied to the load 40.

The power storage unit 30 is mainly provided with a power storage control unit (information and communication unit) 31 and a storage battery 32.
The storage control unit 31 is a controller that controls the storage battery 32. Further, the storage control unit 31 acquires information about the storage unit 30 such as the voltage in the storage battery 32, the current during charging or discharging, and the remaining capacity, and transmits the acquired information to the main control unit 21.

In this embodiment, the example in which the power storage control unit 31 is provided in the power storage unit 30 will be described, but the power storage control unit 31 may or may not be provided in the power storage unit 30. You may.

The storage battery 32 is charged with DC power and discharges the stored DC power. The storage battery 32 may be a secondary battery that can be charged and discharged, and the type and type of the storage battery are not particularly limited. In this embodiment, an example in which the storage battery 32 is a lithium ion battery will be described.

Next, charging and discharging in the power supply system 1 having the above configuration will be described with reference to FIGS. 3 to 9. First, charging and discharging in the first mode M1 will be described, then charging and discharging in the second mode M2 will be described, and finally charging and discharging in the third mode M3 will be described.

First, charging and discharging in the first mode M1 will be described. A switching signal to the first mode M1 is input from the input unit 25 to the main control unit 21 via the external network 26. The main control unit 21 generates a control signal to be output to the first conversion unit 11 and the second conversion unit 12 based on the input switching signal. The generated control signal is output to the first conversion unit 11 and the second conversion unit 12.

As shown in FIG. 3, the first conversion unit 11 to which the control signal is input outputs the DC power of the first high voltage voltage VH1. The DC power output from the first conversion unit 11 is supplied to the load 40. Further, the second conversion unit 12 to which the control signal is input outputs the DC power of the second high voltage voltage VH2. The DC power output from the second conversion unit 12 is charged in the power storage unit 30.

Further, since the regulation unit 13 is provided, it is difficult for the DC power output from the first conversion unit 11 to flow toward the power storage unit 30. Further, since the value of the first high voltage voltage VH1 is higher than the value of the second high voltage voltage VH2, it is difficult for the DC power output from the second conversion unit 12 to flow toward the load 40.

Here, when the storage battery 32 of the power storage unit 30 is charged, the time change of the voltage when the first mode M1 is controlled will be described with reference to FIG. In this case, the value of the first high voltage voltage VH1 of the DC power output from the first conversion unit 11 becomes constant. Further, the value of the second high voltage voltage VH2 of the DC power output from the second conversion unit 12 is also constant. Since the storage battery 32 is charged, the storage voltage VB of the storage battery 32 is also constant. The value of the second high voltage voltage VH2 is controlled according to the value of the storage voltage VB.

Further, the time change of the voltage when the first mode M1 is controlled when the storage battery 32 of the power storage unit 30 is not charged will be described with reference to FIG. In this case, the value of the first high voltage voltage VH1 of the DC power output from the first conversion unit 11 becomes constant. On the other hand, the value of the second high voltage voltage VH2 and the value of the storage voltage VB increase as the storage battery 32 is charged. When the storage battery 32 is charged, the value of the second high voltage voltage VH2 and the value of the storage voltage VB become constant.

As a charging method for the storage battery 32, a known charging method can be used. In this embodiment, an example of charging using a charging method (CCCV charging: constant current constant voltage charging) in consideration of the stored voltage VB of the storage battery 32 and the charging current will be described.

Next, charging and discharging in the second mode M2 will be described. A switching signal to the second mode M2 is input from the input unit 25 to the main control unit 21 via the external network 26. The main control unit 21 generates a control signal to be output to the first conversion unit 11 and the second conversion unit 12 based on the input switching signal. The generated control signal is output to the first conversion unit 11 and the second conversion unit 12.

As shown in FIG. 6, the first conversion unit 11 to which the control signal is input outputs the DC power of the first low voltage voltage VL1. Further, the second conversion unit 12 to which the control signal is input outputs the DC power of the second low voltage voltage VL2.

The DC power of the storage voltage VB is output from the power storage unit 30. The output DC power is supplied to the load 40. Here, since the value of the storage voltage VB is higher than the value of the first low voltage voltage VL1 and the value of the second low voltage voltage VL2, the DC power output from the storage unit 30 causes the regulation unit 13 to load 40. It flows toward.

Here, the time change of the voltage when the second mode M2 is controlled will be described with reference to FIG. 7. In FIG. 7, the time T2 is the timing at which the control of the second mode M2 is started. Before the time T2, the voltage of the DC power output from the first conversion unit 11 is the first high voltage voltage VH1, and the voltage of the DC power output from the second conversion unit 12 is the second high voltage voltage VH2. ..

When the control of the second mode M2 is started, the voltage of the DC power output from the first conversion unit 11 becomes the first low voltage voltage VL1, and the voltage of the DC power output from the second conversion unit 12 becomes the second low voltage. The voltage becomes VL2.

Further, when the control of the second mode M2 is started, discharge is started from the power storage unit 30, and the discharged DC power is supplied to the load 40. The storage voltage VB of the DC power supplied from the power storage unit 30 decreases with the passage of time immediately after the control of the second mode M2. The decrease in the storage voltage VB continues until the value reaches the second low voltage voltage VL2 or switches to the first mode M1 or the third mode M3.

After the value of the storage voltage VB drops to the value of the second low voltage voltage VL2, the discharge from the storage unit 30 is stopped. When the value of the storage voltage VB is lower than the value of the second low voltage voltage VL2, charging of the storage unit 30 is started. Therefore, the value of the stored voltage VB is the same as that of the second low voltage voltage VL2.

The value of the second low voltage voltage VL2 can be exemplified as a value determined so that a predetermined storage capacity remains in the storage unit 30. By doing so, it is possible to stop the discharge from the power storage unit 30 in case the commercial power source 50 loses power. That is, DC power can be supplied from the power storage unit 30 to the load 40 in the event of a power failure.

After the value of the storage voltage VB drops to the value of the second low voltage voltage VL2, or before the value drops to the second low voltage voltage VL2, the mode shifts to the first mode M1 or the third mode M3, and the direct current to the load 40 is obtained. The power supply may be continued. In this case, when the mode shifts to the first mode M1, the power storage unit 30 is charged. Further, when the mode shifts to the third mode M3, charging of the power storage unit 30 is suppressed.

Finally, charging and discharging in the third mode M3 will be described. A switching signal to the third mode M3 is input from the input unit 25 to the main control unit 21 via the external network 26. The main control unit 21 generates a control signal to be output to the first conversion unit 11 and the second conversion unit 12 based on the input switching signal. The generated control signal is output to the first conversion unit 11 and the second conversion unit 12.

As shown in FIG. 8, the first conversion unit 11 to which the control signal is input outputs the DC power of the first high voltage voltage VH1. Further, the second conversion unit 12 to which the control signal is input outputs the DC power of the second low voltage voltage VL2.

The DC power output from the first conversion unit 11 is supplied to the load 40. On the other hand, it is not supplied to the power storage unit 30. When the value of the second low voltage voltage VL2 is lower than the value of the storage voltage VB, charging from the second conversion unit 12 to the storage unit 30 is suppressed.

Here, the time change of the voltage when the control of the third mode M3 is performed will be described with reference to FIG. In FIG. 9, the time T3 is the timing at which the control of the third mode M3 is started.

Before the time T3, the voltage of the DC power output from the first conversion unit 11 is the first low voltage voltage VL1, and the voltage of the DC power output from the second conversion unit 12 is the second low voltage voltage VL2. .. Discharge is performed from the storage unit 30, and the storage voltage VB decreases with the passage of time.

When the control of the third mode M3 is started, the voltage of the DC power output from the first conversion unit 11 becomes the first high voltage voltage VH1. The voltage of the DC power output from the second conversion unit 12 remains the second low voltage voltage VL2.

The stored voltage VB is a value at time T3, and the stored voltage VB is a value between the first high voltage voltage VH1 and the second low voltage voltage VL2. Therefore, it is not discharged from the power storage unit 30 and is not charged.

According to the power supply system 1 having the above configuration, the first conversion unit 11 and the second conversion unit 12 can be operated in the first mode M1, the second mode M2, and the third mode M3, so that the power storage unit 30 can be operated. It is possible to charge the power storage unit 30 at an arbitrary time after discharging.

Here, in the first mode M1 in which the first conversion unit 11 and the second conversion unit 12 output DC power at the first high voltage voltage VH1 and the second high voltage voltage VH2, respectively, power is supplied to the load 40 and the load is supplied. The power storage unit 30 is charged. In the second mode M2 in which the first conversion unit 11 and the second conversion unit 12 output DC power at the first low voltage voltage VL1 and the second low voltage voltage VL2, respectively, the power discharged from the power storage unit 30 is applied to the load 40. Will be supplied. In the third mode M3 in which the first conversion unit 11 and the second conversion unit 12 output DC power at the first high voltage voltage VH1 and the second low voltage voltage VL2, respectively, the load 40 is supplied with power while the power storage unit is charged. Charging to 30 is suppressed.

Therefore, in the power supply system 1, after the power storage unit 30 discharges in the second mode M2, the load 40 is supplied with power in the third mode M3 until the power storage unit 30 is supplied with power, and the power storage unit 30 is supplied with power. Charging can be suppressed. The first mode M1 after the third mode M3 can supply power to the load 40 and charge the power storage unit 30.

According to the power supply system 1 having the above configuration, by setting the second high voltage voltage VH2 to a voltage lower than the first high voltage voltage VH1, power is supplied to the load 40 and the power storage unit 30 is charged in the first mode M1. , Will be easier to achieve at the same time. By setting the second low voltage voltage VL2 to a voltage lower than the second high voltage voltage VH2, it becomes easy to suppress the discharge from the power storage unit 30 to the load 40 in the third mode M3. Further, both the first low voltage voltage VL1 and the second low voltage voltage VL2 are lower than the storage voltage VB discharged from the storage unit 30, and the second low voltage voltage VL2 is set to a voltage equal to or lower than the first low voltage voltage VL1. In the second mode M2, it becomes easier to discharge the power storage unit 30 to the load 40.

By performing switching control of the first mode M1, the second mode M2, and the third mode M3 based on the input switching input, for example, as compared with the case where the switching control is performed based on a predetermined schedule. It becomes easier to perform switching control flexibly. For example, it becomes easy to appropriately change the timing of performing the first mode M1, the second mode M2, and the third mode M3, and the period for continuing each mode according to the surrounding situation.

By providing the power storage control unit 31, information about the power storage unit 30 is input to the main control unit 21. The main control unit 21 can perform switching control while referring to the information regarding the power storage unit 30.

In the above-described embodiment, the main control unit 21 of the power supply device 10 is provided with an input receiving unit 23 into which a switching signal is input, and the description has been made. As shown in FIGS. 10 and 11. A storage unit 123 in which the switching schedules of the first mode M1, the second mode M2, and the third mode M3 are stored may be provided in the main control unit (control unit) 121 instead of the input reception unit 23. ..

In this case, the main control unit 121 controls to switch between the first mode M1, the second mode M2, and the third mode M3 based on the schedule stored in the storage unit 123.
The schedule stored in the storage unit 123 may be predetermined or may be appropriately determined by the administrator of the power supply system 1. Further, the schedule may be stored mutable or immutable.

By performing switching control between the first mode M1, the second mode M2, and the third mode M3 based on the schedule stored in the storage unit 123, for example, in an environment where it is difficult to instruct switching from the outside of the power supply system 1. Even so, switching control can be performed.

1 ... Power supply system, 11 ... 1st conversion unit, 12 ... 2nd conversion unit, 13 ... Regulation unit, 21,121 ... Main control unit (control unit), 23 ... Input reception unit, 30 ... Power storage unit, 31 ... Power storage unit Control unit (information and communication unit), 40 ... load, 123 ... storage unit

Claims (5)

A first low voltage voltage that can be switched between a first high voltage voltage and a first low voltage voltage lower than the first high voltage voltage while converting AC power into DC power and outputting it to a load. Conversion part and
A second high-voltage voltage, which is arranged in parallel with the first conversion unit, converts the AC power into the DC power, and outputs the output DC power to a second high-voltage voltage and a voltage lower than the second high-voltage voltage. A second converter that can be switched between low voltage and
Arranged between the DC power side of the first conversion unit and the DC power side of the second conversion unit, the current flow from the second conversion unit to the first conversion unit is allowed, and the first conversion unit is allowed to flow. A regulation unit that regulates the flow of current from the second conversion unit to the second conversion unit,
The storage voltage, which is the voltage of the power that is electrically connected to the DC power side of the second conversion unit and is output, is lower than the first high voltage and the second high voltage, and the first low voltage. A voltage and a storage unit having a voltage higher than the second low voltage voltage are provided.
The first conversion unit and the second conversion unit
The first mode that outputs DC power at the first high voltage and the second high voltage, respectively, the second mode that outputs DC power at the first low voltage and the second low voltage, respectively, and the first high voltage, respectively. A power supply system configured to be operable in a third mode that outputs DC power at a voltage and the second low voltage. The second high voltage is a voltage lower than the first high voltage.
The power supply system according to claim 1, wherein the second low voltage is a voltage equal to or higher than the first low voltage. A control signal is output to the first conversion unit and the second conversion unit based on a predetermined schedule stored in the storage unit, and switching between the first mode, the second mode, and the third mode is performed. The power supply system according to claim 1 or 2, further comprising a control unit for controlling the above. A control signal is output to the first conversion unit and the second conversion unit based on the switching input of the first mode, the second mode, and the third mode input via the input reception unit, and the control signal is output. The power supply system according to claim 1 or 2, further comprising a control unit that controls switching between the first mode, the second mode, and the third mode. The power supply system according to claim 3 or 4, wherein the power storage unit is provided with an information transmission unit that transmits information about the power storage unit to the control unit.

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