JP4144009B2 - Variable voltage power storage device and hybrid power supply device - Google Patents

Description

  The present invention includes a power storage unit configured by connecting a plurality of power storage circuit groups in series, and at least two of the plurality of power storage circuit groups including a chargeable / dischargeable circuit having a capacitance or a pseudocapacitance. Regarding the variable voltage power storage device and the hybrid power supply device, the variable voltage power storage device capable of adjusting both terminal voltages of the power storage unit by optimizing charging and discharging of the chargeable / dischargeable circuit, and The present invention relates to a hybrid power source device including the device and a battery power source.

  Conventionally, in electric vehicles, electric tools, uninterruptible power supplies (including emergency backup power supplies for buildings, etc.), home appliances, electric toys, etc., a power storage device is configured by a large-capacitance capacitor, and this power storage device is connected to a direct current. There is a power source, or a power source device configured as a hybrid power source device by connecting the power storage device and a battery power source.

  The electric vehicle, the electric tool, and the like have high voltage dependency and need to be supplied with a voltage higher than a predetermined voltage. For this reason, a power storage device is configured by a plurality of capacitors. When each capacitor is sufficiently charged and the terminal voltage is high, the capacitors are connected in parallel. When the capacitor is not sufficiently charged and the terminal voltage is low, the capacitor is connected. Can be connected in series to prevent the terminal voltage of the power storage device from decreasing.

  FIG. 1 shows a circuit in which the power storage device 8 is constituted by two capacitors 811 and 812 and the terminal voltage is changed by switching these capacitors 811 and 812 to series connection or parallel connection by switches 821, 822 and 823. . That is, in the power supply device 8 of FIG. 1, the two capacitors 811 and 812 are connected in series via the switch 822. Further, a terminal of the capacitor 811 to which the switch 822 is not connected and a terminal of the capacitor 812 to which the switch 822 is connected are connected via the switch 821. Further, a terminal of the capacitor 812 to which the switch 822 is not connected and a terminal of the capacitor 811 to which the switch 822 is connected are connected via the switch 823. In the power supply device 8 of FIG. 1, by turning on the switches 821 and 823 and turning off the switch 822, the capacitors 811 and 812 can be connected in parallel, the switches 821 and 823 are turned off, and the switch 822 is turned on. Thus, the capacitors 811 and 812 can be connected in series.

  In addition, as shown in FIG. 2, the power storage device 9 can be configured by a capacitor 91 and a half-bridge converter 92. The half-bridge converter 92 includes two switches 921 and 922 connected in series, two diodes 923 and 924 connected in parallel to these switches, and an inductor 925 having one end connected to the connection point of the switches 921 and 922. Thus, one terminal of the capacitor 91 is connected to the other end of the inductor 925, and the other terminal of the capacitor 91 is connected to a terminal on one side of the switch (FET switch 922 in FIG. 2) to which the inductor 925 is not connected. Has been. In FIG. 2, the diode 923 connected in parallel to the switch 921 has an anode A on the side to which the inductor 925 is connected, and the diode 924 connected in parallel to the switch 922 has a direction to have the cathode K on the side to which the inductor 925 is connected. Has been. Here, the diodes 923 and 924 are parasitic diodes of the FET switches 921 and 922 or intentionally provided freewheeling diodes. In the power storage device 9 of FIG. 2, when charging the capacitor 91, the switch 921 is turned on / off while the switch 922 is kept off. Accordingly, when the switch 921 is turned on, the capacitor 91 is charged by the voltage appearing at the terminals a1 and a2 of the power storage device 9, and when the switch 921 is turned off, the energy stored in the inductor 925 is used for the diode 924. A current flows through the path of the inductor 925 and the capacitor 91. When discharging the capacitor 91, the switch 922 is turned on with the switch 921 turned off. As a result, energy is accumulated in the inductor 925. Next, when the switch 922 is turned off, current flows through the path of the capacitor 91, the inductor 925, and the diode 923 due to the energy accumulated in the inductor 925.

  However, in the power storage device 8 that switches the switches 821, 822, and 823 so that the capacitors 811 and 812 of FIG. 1 are connected in series and in parallel, the voltage can be switched only in steps (in FIG. 1, only in two steps). Can not.

  Further, in the power storage device 9 using the half-bridge converter 92 of FIG. 2, a conversion loss occurs when energy is stored in the capacitor 91 from the terminals a1 and a2, and the stored energy is transferred from the capacitor 91 to the terminals a1 and a2. Conversion loss occurs when output to the outside. That is, two conversion losses occur. Further, since all energy supplied from the terminals a1 and a2 to the capacitor 91 passes through the half-bridge converter 92, a large converter is required.

It is an object of the present invention to provide a power storage unit configured by connecting a plurality of power storage circuit groups in series, and at least two of the plurality of power storage circuit groups including a chargeable / dischargeable circuit having a capacitance or a pseudo capacity. An object of the present invention is to provide a variable voltage power storage device that adjusts both terminal voltages by charging and discharging the chargeable / dischargeable circuit.
Another object of the present invention is to provide a hybrid power supply apparatus that can intentionally change the ratio of the current supplied from the power storage unit to the load and the current supplied from the power battery to the load.

The variable voltage power storage device of the present invention is configured by connecting a plurality of power storage circuit groups in series, and at least two of the power storage circuits constituting the plurality of power storage circuit groups have electrostatic capacity or pseudo capacity and can be charged / discharged. At least one DC power conversion circuit for exchanging energy stored in each circuit between a storage unit composed of a circuit and two circuits selected from the chargeable / dischargeable circuits; and the DC And a control device for controlling the power conversion circuit.
The variable voltage power storage device of the present invention can be applied not only to electric vehicles, electric tools, uninterruptible power supplies (UPS), home appliances, electric toys, but also to fuel cell systems and solar cell systems.
Here, “a chargeable / dischargeable circuit having a capacitance or pseudocapacitance” typically means a capacitor that accumulates using the capacitance of a dielectric, or a capacitor that accumulates using a pseudocapacitance accompanied by an oxidation-reduction reaction. Or a circuit (hereinafter referred to as “electric storage circuit”) including a battery (lithium battery or the like) that employs an electrochemical capacitor or an electrode functioning as a capacitor as a positive or negative electrode. This circuit can include a secondary battery that does not function as a capacitor. In the present specification, the above element is referred to as a “storage element” as appropriate.

  The power storage circuit may be configured by one power storage element, or may be configured by connecting a plurality of power storage elements in series or in parallel. In the variable voltage power storage device of the present invention, the power storage unit can be configured by connecting a plurality of power storage circuits in series.

  In the variable voltage power storage device of the present invention, a chargeable / dischargeable circuit in which energy is exchanged by the DC power conversion circuit can be configured such that electrostatic capacity or pseudo capacity is different from each other.

  In the variable voltage power storage device of the present invention, the control device exchanges the energy stored in the two power storage circuits so as to change the voltage between the terminals of the power storage unit without changing the total power storage amount of the power storage unit. Can be configured to do. Further, the control device is configured to exchange energy accumulated in the two power storage circuits so as to change a total power storage amount of the power storage unit without changing a voltage between terminals of the power storage unit. You can also.

  In the variable voltage power storage device of the present invention, the DC power conversion circuit is configured to discharge one circuit and charge the other circuit between the two power storage circuits, and to discharge the other circuit. Thus, the bidirectional DC power conversion circuit having a function of charging the one circuit can be obtained.

  In the variable voltage power storage device of the present invention, the DC power conversion circuit may be a DC / DC converter.

  In the variable voltage power storage device of the present invention, the DC power conversion circuit can be a chopper circuit. In this case, the chopper circuit includes an inductor connected to a connection point of the two power storage circuits, a terminal of the two power storage circuits on which the inductor is not connected, and the inductor A switch connected between the other terminal of the first and second terminals, and a connection between the terminal of the other power storage circuit where the inductor is not connected and the other terminal of the inductor. And a diode.

In the variable voltage power storage device of the present invention, the power storage circuit can be configured to include an electric double layer capacitor or an electrochemical capacitor.
The hybrid power supply device of the present invention can include the above-described variable voltage power storage device and a battery power source connected between both terminals of the power storage unit provided in the device.

A predetermined voltage and a predetermined current can be provided to the terminal as a continuously variable output without switching the connection of the power storage units and regardless of the amount of energy stored in the power storage units.
In addition, since only a part of the total power passes through the DC power conversion circuit, the DC power conversion circuit can be small in size, and loss associated with power conversion can be reduced.
Furthermore, the ratio of the current supplied from the power storage unit to the load and the current supplied from the power battery to the load can be changed intentionally.

  A basic configuration of the variable voltage power storage device of the present invention is shown in FIG. In FIG. 3, energy is supplied from the charging device CD to the series circuit of the power storage circuits K1 and K2 constituting the power storage unit U. The storage circuits K1 and K2 are composed of the capacitors C1 and C2 in FIG. 3, but the K1 and K2 can be configured by connecting a plurality of capacitors in series or in parallel. In FIG. 3, the capacitor C1 is indicated by a small symbol and the capacitor C2 is indicated by a large symbol, which indicates that the capacitance of C1 is smaller than the capacitance of C2. A load R0 is connected to the power storage unit U. The variable voltage power storage device includes a DC power conversion circuit (DC / DC (1) in FIG. 3) in which both terminals of the storage circuit K1 are connected to the input terminal and both terminals of the storage circuit K2 are connected to the output terminal, A DC power conversion circuit (DC / DC (2) in FIG. 3) in which both terminals of the circuit K2 are connected to the input terminal and both terminals of the storage circuit K1 are connected to the output terminal is provided. The control device CNT controls DC / DC (1) and DC / DC (2) so that the mutual exchange of energy is performed between the capacitors C1 and C2, and both terminal voltages of the power storage unit U are constant. . As a result, a constant voltage of power can be supplied to the load R0.

  4A and 4B show a modification example of the basic configuration of FIG. In FIG. 4A, the power storage unit U includes two power storage circuits K1 and K2, K1 includes capacitors C11 and C12 connected in parallel, and K2 includes capacitors C21 and C22 connected in series. In FIG. 4A, a load R21 is connected to the capacitor C21, and a load R22 is connected to the capacitor C22. The variable voltage power storage device includes a DC power conversion circuit in which both terminals of the storage circuit K1 are connected to the input terminal and both terminals of the storage circuit K2 are connected to the output terminal (DC / DC (1) in FIG. 4A). And a DC power conversion circuit (DC / DC (2) in FIG. 4A) in which both terminals of the storage circuit K2 are connected to the input terminal and both terminals of the storage circuit K1 are connected to the output terminal. . In FIG. 4A, although the control device is not shown, DC / DC is performed so that energy is exchanged between the power storage circuits K1 and K2 so that both terminal voltages of the power storage circuit K2 are constant. (1), DC / DC (2) is controlled. As a result, it is possible to supply constant voltage power to the loads R21 and R22. In FIG. 4A, no load is connected to both terminals of the power storage unit U. However, a load (R0) as shown in FIG. 3 can be connected, or both terminals of the power storage circuit K2. It is also possible to connect a load.

  In FIG. 4B, the power storage unit U includes three power storage circuits K1, K2, and K3, and the power storage circuits K1, K2, and K3 include capacitors C1, C2, and C3. In FIG. 4B, loads R0 are connected to both ends of the power storage unit U. The variable voltage power storage device has a DC power conversion circuit (DC / DC (1) in FIG. 4B) in which both terminals of the power storage circuit K1 are connected to the input terminal and both terminals of the power storage circuit K2 are connected to the output terminal. ), A DC power conversion circuit (DC / DC (2) in FIG. 4B) in which both terminals of the storage circuit K2 are connected to the input terminal and both terminals of the storage circuit K3 are connected to the output terminal, and the storage circuit A DC power conversion circuit (DC / DC (3) in FIG. 4B) in which both terminals of K3 are connected to the input terminal and both terminals of the storage circuit K1 are connected to the output terminal is provided. In FIG. 4B, the control device is not shown, but energy is exchanged between the storage circuits K1 and K2, between K2 and K3, and between K3 and K1, and the storage unit. DC / DC (1), DC / DC (2), and DC / DC (3) are controlled so that the voltage across both terminals of U is constant. As a result, a constant voltage of power can be supplied to the load R0. In FIG. 4B, a load is not connected to each terminal of the power storage circuits K1, K2, and K3, but a load can be appropriately connected. In this case, the load R0 may not be connected to the power storage unit U.

  FIG. 5 is an explanatory diagram showing a first embodiment of a variable voltage power storage device of the present invention using a DC / DC converter as a DC power conversion circuit. 5, the variable voltage power storage device 1 includes a series connection circuit of two capacitors (storage elements) 111 and 112, two DC / DC converters 121 and 122, and three voltage detection circuits 131, 132, and 133. The control device 14 is provided.

  Capacitances C1 and C2 (storage capacities) of the capacitor 111 and the capacitor 112 are different, and in FIG. 5, C1> C2. The DC / DC converter 121 has an input terminal connected between the terminals of the capacitor 111, an output terminal connected between the terminals of the capacitor 112, and the DC / DC converter 122 has an input terminal connected between the terminals of the capacitor 112, An output terminal is connected between the terminals of the capacitor 111. The voltage detection circuits 131 and 132 detect the voltages V1 and V2 between the terminals of the capacitors 111 and 112, respectively, and the voltage detection circuit 133 detects the voltage V3 between the input / output terminals a1 and a2. Here, since V1 + V2 = V3, any one of the voltage detection circuits 131, 132, 133 may be omitted for calculation. The control device 14 can control the DC / DC converters 121 and 122 by a predetermined control method (PWM, PFM, etc.).

  In FIG. 5, the control device 14 controls the DC / DC converters 121 and 122 so that a substantially constant voltage (V3 = V0) appears at the input / output terminals a1 and a2 of the variable voltage power storage device 1. Assume that the voltages V1 and V2 between the terminals of the capacitors 111 and 112 are adjusted.

  It is assumed that current continues to flow from the outside to the input / output terminals a1 and a2 and V1 + V2> V0. Since the charge of the capacitor is the product of the capacitance and the voltage between the terminals, the control device 14 controls the DC / DC converter 122 to change the charge of the capacitor 112 (in other words, the electrostatic energy of the capacitor 112) to the capacitor. Move to 111. As a result, the terminal voltage V2 of the capacitor 112 decreases and the terminal voltage V1 of the capacitor 111 increases, but since C1> C2, the degree of decrease of the terminal voltage V2 is greater than the degree of increase of the terminal voltage V1. V1 + V2 = V0.

  Conversely, it is assumed that current continues to flow from the input / output terminals a1 and a2 and V1 + V2 <V0. In this case, the control device 14 can control the DC / DC converter 121 so as to move the electric charge of the capacitor 111 to the capacitor 112, so that V1 + V2 = V0.

  In FIG. 5, the mutual exchange between the charge stored in the capacitor 111 and the charge stored in the capacitor 112 is based on the detection result of the voltage detection circuits 131 and 132 (change in the voltage between the terminals of the capacitors 111 and 112). However, the currents flowing through the capacitors 111 and 112 may be detected, and the charges may be exchanged based on the integrated value of the currents.

  In the variable voltage power storage device 1 of FIG. 5, the case where the voltage appearing at the input / output terminals a1 and a2 has a constant value (V0) has been described. By adjusting the charge stored, the input / output terminals a1 and a2 can be set to desired values.

  FIG. 6 is an explanatory diagram showing a second embodiment of the variable voltage power storage device of the present invention using a chopper circuit as a DC power conversion circuit. In FIG. 6, the variable voltage power storage device 2 includes a series connection circuit of two capacitors 211 and 212, two switches 221 and 222, two diodes 231 and 232, an inductor 24, and three voltage detection circuits 251. , 252 and 253 and a control device 26.

  The switches 221 and 222, the diodes 231 and 232, and the inductor 24 constitute a DC power conversion circuit. One terminal of the inductor 24 is connected to a connection point between the capacitors 211 and 212.

  The switch 221 is an FET, and is connected between a terminal on the side of the capacitor 211 where the inductor 24 is not connected and the other terminal of the inductor 24, and the switch 221 is a side where the inductor 24 of the capacitor 212 is not connected. And the other terminal of the inductor 24.

The diodes 231 and 232 are connected to the switches 221 and 222 in parallel. The diodes 231 and 232 are FET parasitic diodes or intentionally provided free-wheeling diodes. The diode 231 has an anode facing the inductor 24 side, and a diode 232 has a cathode facing the inductor 24 side.
The capacitances C1 and C2 of the capacitor 211 and the capacitor 212 are different, and in FIG. 6, C1> C2.

  The voltage detection circuits 251 and 252 detect the voltages V1 and V2 between the terminals of the capacitors 211 and 212, respectively, and the voltage detection circuit 253 detects the voltage between the input / output terminals a1 and a2. The control device 26 can output a signal by a predetermined control method (PWM, PFM, etc.) to the control terminals (G) of the switches 221 and 222.

  In FIG. 6, the control device 26 controls the switches 221 and 222 to control the capacitors 211 and 212 so that a substantially constant voltage V3 = V0 appears at the input / output terminals a1 and a2 of the variable voltage power storage device 2. The inter-terminal voltages V1 and V2 are adjusted.

  It is assumed that current continues to flow from the outside to the input / output terminals a1 and a2 and V1 + V2> V0. The control device 26 controls the switches 221 and 222 to move (commutate) the electric charge of the capacitor 212 (in other words, the electrostatic energy of the capacitor 212) to the capacitor 211. That is, the switch 221 is turned off and the switch 222 is turned on as shown in FIG. 7A, the energy of the capacitor 212 is stored in the inductor 24, and then the switch 222 is turned off as shown in FIG. The energy stored in the inductor 24 is moved to the capacitor 211 via the H.231.

  As a result, the terminal voltage V2 of the capacitor 212 decreases and the terminal voltage V1 of the capacitor 211 increases. However, since C1> C2, the degree of decrease in the terminal voltage V2 is greater than the degree of increase in the terminal voltage V1. V1 + V2 = V0.

  Conversely, it is assumed that current continues to flow from the input / output terminals a1 and a2 and V1 + V2 <V0. The control device 26 controls the switches 221 and 222 to commutate the charge of the capacitor 211 to the capacitor 212. That is, as shown in FIG. 8A, the switch 221 is turned on and the switch 222 is turned off, the energy of the capacitor 211 is stored in the inductor 24, and then the switch 221 is turned off as shown in FIG. The energy stored in 24 is moved to the capacitor 212.

As a result, the control device 26 can control the switch 221 so that the electric charge of the capacitor 211 is moved to the capacitor 212, so that V1 + V2 = V0.
In the DC power conversion circuit 2 of FIG. 6, the case where the voltage appearing at the input / output terminals a <b> 1 and a <b> 2 has a constant value has been described, but the charge stored in the capacitors 211 and 212 even when the voltage is changed as appropriate. By adjusting, the input / output terminals a1 and a2 can be set to desired values.

  The example in which power is supplied to the load connected to the terminals a1 and a2 by the two capacitors 211 and 212 has been described above. However, as shown in FIG. 9, the terminals a1 and a2 are connected by the three capacitors 211, 212, and 213. It is also possible to supply power to a load (not shown) connected to. In FIG. 9, power transfer between the capacitors 211 and 212 is controlled using the same circuit as that shown in FIG. 8, and the capacitors 212 and 213 are also the same as those shown in FIG. 8. I have control. In the circuit of FIG. 9, fine control can be performed when the voltages at the terminals a1 and a2 are rapidly changed.

  FIG. 10 is an explanatory diagram showing an embodiment of the hybrid power supply device of the present invention. 10, the hybrid power supply device 3 includes a variable voltage power storage device (excluding a control device, indicated by reference numeral 31 in FIG. 10) illustrated in FIG. , A2 and a control unit 33. A load 4 is connected to the input / output terminals a1 and a2. In FIG. 10, it is assumed that the load 4 has a regeneration function. In FIG. 10, the battery power source 32 is indicated by an internal resistance 321 and an electromotive voltage 322, and the voltage fluctuates due to the current flowing through itself.

The variable voltage power storage device 31 includes capacitors 3111 and 3112 connected in series, DC / DC converters 3121 and 3122, and voltage detection circuits 3131, 3132 and 3133.
The DC / DC converter 3121 receives the terminal voltage of the capacitor 3111 as an input and outputs a converted voltage to the terminal of the capacitor 3112. The DC / DC converter 3122 receives the terminal voltage of the capacitor 3112 as an input and outputs the converted voltage to the terminal of the capacitor 3111. To do. The voltage detection circuits 3131 and 3132 can detect the voltages V1 and V2 between the terminals of the capacitors 3111 and 3112, and the voltage detection circuit 3133 can detect the voltage V3 between the input and output terminals (a1 and a2). Although not shown in FIG. 10, the hybrid power supply device 3 appropriately includes a current detection circuit for detecting currents flowing through various places (currents flowing through the capacitors 3111 and 3112, current flowing through the battery power supply 32, etc.). Can be provided.

  The control device 33 exchanges the energy stored in the capacitor 3111 and the capacitor 3112 so that the voltage V3 between the terminals a1 and a2 becomes a desired value according to the power supplied to the load 4 or the power regenerated from the load. Control can be performed. When power is being supplied to the load 4, the discharge power of the battery power source 32 can be increased as V3 is lowered. When the power is regenerated from the load 4, the charge power of the battery power source 32 can be increased as V3 is increased. .

It is explanatory drawing which shows the conventional electrical storage apparatus which changes a terminal voltage by the switching of several parallel capacitors in series. It is explanatory drawing which shows the conventional electrical storage apparatus using a half-bridge converter. It is a block diagram which shows the basic composition of the direct-current power converter circuit of this invention. FIG. 4 is a block diagram illustrating a modification example of the basic configuration of FIG. 3, in which (A) is a diagram illustrating an example in which the power storage unit is configured by two power storage circuits, and (B) is a power storage unit configured by three power storage circuits. It is a figure which shows an example. It is explanatory drawing which shows 1st Embodiment of the variable voltage type electrical storage apparatus of this invention using a DC / DC converter as a direct-current power converter circuit. It is explanatory drawing which shows 2nd Embodiment of the variable-voltage type electrical storage apparatus of this invention using the chopper as a direct-current power converter circuit. (A), (B) is a figure which shows the operation state when lowering the voltage V3 between terminals in the variable voltage type electrical storage apparatus of FIG. (A), (B) is a figure which shows the operation state when raising the voltage V3 between terminals in the variable voltage type electrical storage apparatus of FIG. It is a figure which shows an example when it is desired to change the voltage of a load rapidly in the variable voltage power storage device of the present invention. It is explanatory drawing which shows embodiment of the hybrid type power supply device of this invention.

Explanation of symbols

1, 2, 31 Variable voltage type power storage device 3 Hybrid type power supply device 4 Load 14, 26, 33 Control device 24 Inductor 32 Battery power source 111, 112, 211, 212, 213, 3111, 3112 Capacitors 121, 122, 3121, 3122 DC / DC converter 131, 132, 133, 251, 252, 253, 3131, 3132, 3133 Voltage detection circuit 221, 222, 223, 224 Switch 231, 232 Diode 321 Internal resistance 322 Electromotive voltage C1, C2, C3, C11 C12, C21, C22 Capacitor CD Charging device CNT Control device DC / DC (1), DC / DC (2), DC / DC (3) DC power conversion circuit K1, K2, K3 Power storage circuit R0, R21, 22 Load U Power storage unit

Claims (10)

A plurality of power storage circuit groups are connected in series, and at least two of the power storage circuits forming the plurality of power storage circuit groups are configured from chargeable / dischargeable circuits having electrostatic capacity or pseudo capacity; and
At least one DC power conversion circuit for exchanging energy stored in each circuit between two circuits selected from the chargeable / dischargeable circuits;
A control device for controlling the DC power conversion circuit;
A variable voltage power storage device comprising:   2. The variable voltage power storage device according to claim 1, wherein the chargeable / dischargeable circuits in which energy is exchanged by the DC power conversion circuit have different capacitances or pseudo capacitances.   The control device controls the DC power conversion circuit so as to change the voltage between the terminals of the power storage unit without changing the total amount of power stored in the power storage unit, and exchanges the energy stored in the two circuits. The variable voltage power storage device according to claim 1 or 2.   The control device controls the DC power conversion circuit so as to change the total amount of electricity stored in the electricity storage unit without changing the voltage between the terminals of the electricity storage unit, and exchanges the energy accumulated in the two circuits. The variable voltage power storage device according to claim 1 or 2.   The DC power conversion circuit has a function of discharging one circuit to charge the other circuit between two circuits selected from the chargeable / dischargeable circuits, and discharging the other circuit to 5. The variable voltage power storage device according to claim 1, which is a bidirectional DC power conversion circuit having a function of charging one of the circuits.   6. The variable voltage power storage device according to claim 1, wherein the DC power conversion circuit is a DC / DC converter.   6. The variable voltage power storage device according to claim 1, wherein the DC power conversion circuit is a chopper circuit. The chopper circuit is
An inductor connected to a connection point of two circuits selected from the chargeable and dischargeable circuits;
A switch connected between a terminal of one of the two circuits to which the inductor is not connected and the other terminal of the inductor; and
A diode connected between a terminal of the other circuit to which the inductor is not connected and the other terminal of the inductor, of the two circuits;
The variable voltage power storage device according to claim 7, comprising:   The variable voltage type according to any one of claims 1 to 8, wherein the chargeable / dischargeable circuit having the electrostatic capacity or pseudo capacity includes an electric double layer capacitor or an electrochemical capacitor. Power storage device.   10. A hybrid power supply device comprising: the variable voltage power storage device according to claim 1; and a battery power source connected between both terminals of the power storage unit provided in the device.

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