JP7008206B2 - Power supply system, power supply system and mobile - Google Patents

Description

The present disclosure relates generally to power supply systems, power systems and mobiles, and more particularly to power supply systems that supply power to loads, power systems comprising them, and mobiles comprising them.

Patent Document 1 describes a power supply system (power control system) including a first power supply (secondary battery), a second power supply (energy device), and a switch for switching a power supply path. .. In Patent Document 1, the second power source is, for example, an electric double layer capacitor.

In the power supply system described in Patent Document 1, a state in which a power supply path between the second power supply and the inverter is connected and a state in which the power supply path between the first power supply and the inverter are connected by a switch. And, can be switched. In the former state, the electric power from the second power source is supplied to the inverter, converted from direct current to alternating current by the inverter, and then supplied to the load (electric appliance). In the latter state, the electric power from the first power source is supplied to the inverter, converted from direct current to alternating current by the inverter, and then supplied to the load (electric appliance).

Japanese Unexamined Patent Publication No. 2013-132182

In the configuration described in Patent Document 1, for example, when the power supply source to the inverter is switched from the second power source to the first power source, the second power source is disconnected from the inverter, so that the first power source is connected to the inverter. Until then, the power supply to the inverter may be interrupted. Therefore, the inverter may be temporarily stopped and the power supply from the inverter to the load may be interrupted.

The present disclosure has been made in view of the above reasons, and an object of the present invention is to provide a power supply system, a power supply system, and a mobile body capable of continuously supplying power to a load.

The power supply system according to one aspect of the present disclosure includes a first drive circuit and a second drive circuit. The first drive circuit is electrically connected to a first power source including a battery. The second drive circuit is electrically connected to a second power source different from the first power source. The first drive circuit and the second drive circuit operate in synchronization with each other and supply electric power to a common load. The first drive circuit includes a first inverter circuit that converts a DC voltage from the first power supply into an AC voltage and applies it to the load. The second drive circuit includes a second inverter circuit that converts a DC voltage from the second power supply into an AC voltage and applies it to the load. The first inverter circuit includes a plurality of first switching elements. The second inverter circuit includes a plurality of second switching elements. The first switching element, which is a part of the plurality of first switching elements, is also used as the second switching element, which is a part of the plurality of second switching elements.

The power supply system according to one aspect of the present disclosure includes the power supply system, the first power supply, and the second power supply.

The mobile body according to one aspect of the present disclosure includes the power supply system and the mobile body main body having the load.

The present disclosure has the advantage that power can be continuously supplied to the load.

FIG. 1 is a schematic diagram showing a configuration of a power supply system and a power supply system according to the first embodiment. FIG. 2 is a circuit diagram showing the configuration of the same power supply system and power supply system. FIG. 3 is an external view of a mobile body including the same power supply system. FIG. 4 is a graph showing an operation example of the same power supply system. FIG. 5 is a circuit diagram showing a configuration of a power supply system and a power supply system according to the first modification of the first embodiment. FIG. 6 is a circuit diagram showing the configurations of the power supply system and the power supply system according to the second embodiment.

(Embodiment 1)
(1) Overview As shown in FIG. 1, the power supply system 10 according to the present embodiment includes at least a first drive circuit 1 and a second drive circuit 2. The first drive circuit 1 is electrically connected to a first power source 91 made of a battery. The second drive circuit 2 is electrically connected to a second power supply 92 separate from the first power supply 91. The first drive circuit 1 and the second drive circuit 2 operate in synchronization with each other and supply electric power to a common load 90. The second power supply 92 can output a larger current than the first power supply 91. The first power source 91 is, for example, a secondary battery such as a lithium ion battery (LIB: Lithium Ion Battery). The second power supply 92 is, for example, an electrochemical device (storage device) having a higher output density than the first power supply 91, such as a capacitor.

That is, the power supply system 10 according to the present embodiment is a system that supplies power from the first power supply 91 and the second power supply 92 to a common load 90 in the first drive circuit 1 and the second drive circuit 2, respectively. Is. In other words, in the power supply system 10, the power from the first power supply 91 is supplied to the load 90 by the first drive circuit 1, and the power from the second power supply 92 is supplied to the load 90 by the second drive circuit 2. To. Therefore, according to the power supply system 10, a drive circuit (first drive circuit) that is independent for each power supply while supplying power from two types of power supplies (first power supply 91 and second power supply 92) to a common load 90. Power can be supplied to the load 90 by 1 or the second drive circuit 2).

According to the power supply system 10 as described above, for example, even when the power supply source is switched from the second power supply 92 to the first power supply 91, the first power supply 91 is connected to the first drive circuit 1 and is the first. The state in which the two power sources 92 are connected to the second drive circuit 2 can be maintained. As a result, in the power supply system 10, even when the power supply source is switched, the power is continuously supplied to the load 90 without stopping the first drive circuit 1 and the second drive circuit 2. It is possible to do.

Further, the power supply system 10 according to the present embodiment constitutes the power supply system 100 together with the first power supply 91 and the second power supply 92. In other words, the power supply system 100 includes a power supply system 10, a first power supply 91, and a second power supply 92. In such a power supply system 100, the power supply system 100 can independently supply electric power to the load 90 as long as the electric energy stored in the first power supply 91 and the second power supply 92 is not exhausted.

Further, by supplying power from the outside of the power supply system 10 to at least one of the first power supply 91 and the second power supply 92 to charge at least one of the first power supply 91 and the second power supply 92. The power supply system 100 can be used repeatedly. As will be described in detail later, in the present embodiment, the first drive circuit 1 and the second drive circuit 2 in the power supply system 10 are bidirectionally powered between the first power supply 91 and the second power supply 92 and the load 90. It has the function of exchanging (electrical energy). As a result, in the power supply system 100, regenerative power from the load 90 is supplied to at least one of the first power supply 91 and the second power supply 92 to charge at least one of the first power supply 91 and the second power supply 92. can do.

Further, the power supply system 100 according to the present embodiment constitutes the mobile body 8 (see FIG. 3) together with the mobile body main body 81 (see FIG. 3) including the load 90. In other words, the mobile body 8 includes a power supply system 100 and a mobile body main body 81 having a load 90. In the present embodiment, the moving body 8 is, for example, an electric motorcycle (two-wheeled vehicle) that travels on a road surface with a person on it. Further, in the present embodiment, the load 90 is an electric motor (motor) and generates power (propulsive force) of the moving body main body 81. That is, when the power supply system 100 supplies electric power to the load 90, the power of the moving body main body 81 is generated by the load 90, and the moving body 8 can move (run).

(2) Details Hereinafter, the power supply system 10, the power supply system 100, and the mobile body 8 according to the present embodiment will be described in detail with reference to FIGS. 1 to 4. In the present embodiment, it is assumed that the load 90 is an AC motor that operates by inputting a three-phase AC (voltage), specifically, a three-phase AC cage induction motor.

(2.1) Configuration The power supply system 10 has a first drive circuit 1 electrically connected to the first power supply 91 and a second drive circuit 2 electrically connected to the second power supply 92 as described above. And have. Further, as shown in FIG. 1, the power supply system 10 according to the present embodiment further includes a control circuit 3, a charging circuit 4, a pair of switches 51 and 52, and a detection circuit 6.

Further, the power supply system 100 includes a first power supply 91 and a second power supply 92 in addition to the power supply system 10 described above. In the present embodiment, as an example, a plurality of components constituting the power supply system 100 are all housed in one housing.

In the present embodiment, both the first power supply 91 and the second power supply 92 are power supplies capable of both charging and discharging. The first power source 91 is, for example, a secondary battery made of a lithium ion battery (LIB: Lithium Ion Battery). The second power supply 92 is an electrochemical device (storage device) having a higher output density than the first power supply 91. In the present embodiment, the first power supply 91 is a battery, while the second power supply 92 is a capacitor. In particular, in the present embodiment, the second power supply 92 is an electrochemical device having a higher energy density than an electrochemical device such as an electric double layer capacitor (EDLC). The outline of the electrochemical device used as the second power source 92 is as follows.

This electrochemical device includes a positive electrode member, a negative electrode member, and a non-aqueous electrolytic solution. The positive electrode member has a positive electrode current collector and a positive electrode material layer supported on the positive electrode current collector and containing a positive electrode active material. The positive electrode material layer contains a positive electrode active material. The positive electrode active material has a fibrous or granular inner core portion containing the first conductive polymer, and a fibrous or granular surface layer portion covering at least a part of the inner core portion. The surface layer portion contains a second conductive polymer different from the first conductive polymer. The negative electrode member has a negative electrode material layer containing a negative electrode active material. The negative electrode active material is, for example, a substance in which a redox reaction accompanied by occlusion and release of lithium ions proceeds, and specifically, a carbon material, a metal compound, an alloy, a ceramics material, or the like. The non-aqueous electrolyte solution has lithium ion conductivity as an example. This type of non-aqueous electrolyte contains a lithium salt and a non-aqueous solution that dissolves the lithium salt.

Details of this type of electrochemical device are described in International Publication No. 2017/130855. The electrochemical device having the above configuration has a higher capacity (that is, a higher energy density) than, for example, an electric double layer capacitor or a lithium ion capacitor. Although the second power supply 92 made of such an electrochemical device can output a larger current (that is, has a higher output density) than the first power supply 91 made of a lithium ion battery, it has a lower capacity than the first power supply 91. (That is, the energy density is low). By using the second power supply 92 in combination with the first power supply 91, the power supply system 100 according to the present embodiment can realize a power supply having a relatively high output density and a high energy density.

The first drive circuit 1 is electrically connected to the first power supply 91. The second drive circuit 2 is electrically connected to the second power supply 92. The first drive circuit 1 and the second drive circuit 2 operate in synchronization with each other to supply electric power to a common load 90. In the present embodiment, the synchronization of the first drive circuit 1 and the second drive circuit 2 is realized by the control circuit 3 that controls the first drive circuit 1 and the second drive circuit 2.

Here, the first power supply 91 and the second power supply 92 are both DC power supplies that output a DC voltage. On the other hand, the load 90 that receives power from the power supply system 100 is an AC motor that operates by inputting an AC voltage. Therefore, in the present embodiment, the first drive circuit 1 has a first inverter circuit 11 (see FIG. 2) that converts the DC voltage from the first power supply 91 into an AC voltage and applies it to the load 90. Similarly, the second drive circuit 2 has a second inverter circuit 21 (see FIG. 2) that converts the DC voltage from the second power supply 92 into an AC voltage and applies it to the load 90. In the present embodiment, since the first drive circuit 1 comprises only the first inverter circuit 11, the first inverter circuit 11 is equivalent to the first drive circuit 1. Similarly, since the second drive circuit 2 comprises only the second inverter circuit 21, the second inverter circuit 21 is equal to the second drive circuit 2.

Further, the first drive circuit 1 and the second drive circuit 2 have a regenerative mode in which electric power is supplied from the load 90 to the first power supply 91 and the second power supply, respectively. That is, each of the first drive circuit 1 and the second drive circuit 2 has two operation modes, a power supply mode and a regenerative mode, as operation modes. The power supply mode is an operation mode in which power is supplied from the first power supply 91 and the second power supply 92 to the load 90. In other words, each of the first drive circuit 1 and the second drive circuit 2 has a function of passing electric power (electrical energy) in both directions between the first power supply 91 and the second power supply 92 and the load 90. In the regenerative mode, each of the first drive circuit 1 and the second drive circuit 2 supplies the regenerative power from the load 90 to the first power supply 91 or the second power supply 92, and supplies the regenerative power from the load 90 to the first power supply 91 or the second power supply. The 92 can be charged.

Here, as described above, the first power supply 91 and the second power supply 92 are both power supplies capable of both charging and discharging (in this embodiment, a secondary battery or a capacitor). Further, in the present embodiment, the load 90 functions as an electric motor (motor) that operates by receiving power supplied from the first power source 91 or the second power source 92, and also with respect to the first power source 91 or the second power source 92. Functions as a generator that supplies electric power. As a result, when the first drive circuit 1 or the second drive circuit 2 operates in the power supply mode, the first power supply 91 or the second power supply 92 is discharged, and the load 90 functions as a motor. On the other hand, when the first drive circuit 1 or the second drive circuit 2 operates in the regenerative mode, the load 90 functions as a generator, and the first power supply 91 or the second power supply 92 is charged.

As shown in FIG. 2, the first inverter circuit 11 of the first drive circuit 1 includes a plurality of first switching elements Q11 to Q16. In the present embodiment, the load 90 is a three-phase alternating current motor that operates by inputting a three-phase alternating current (voltage). Therefore, the first inverter circuit 11 includes a three-phase inverter circuit that converts direct current (voltage) into three-phase alternating current (voltage) of U-phase, V-phase, and W-phase. Specifically, the first inverter circuit 11 has a total of six first switching elements Q11 to Q16, two for each of the U phase, the V phase, and the W phase.

Specifically, the pair of first switching elements Q11 and Q14 are electrically connected in series to form a leg corresponding to the U phase. The pair of first switching elements Q12 and Q15 are electrically connected in series to form a leg corresponding to the V phase. The pair of first switching elements Q13 and Q16 are electrically connected in series to form a leg corresponding to the W phase. The three legs corresponding to these U-phase, V-phase, and W-phase are electrically connected in parallel between the output ends of the first power supply 91. The midpoint of each leg, that is, the connection point of the pair of first switching elements connected in series, constitutes the output end of the first inverter circuit 11 and is electrically connected to the load 90.

As shown in FIG. 2, the second inverter circuit 21 of the second drive circuit 2 includes a plurality of second switching elements Q21 to Q26. The second inverter circuit 21 includes a three-phase inverter circuit having basically the same configuration as the first inverter circuit 11. That is, the second inverter circuit 21 has a total of six second switching elements Q21 to Q26, two for each of the U phase, the V phase, and the W phase.

In the present embodiment, each of the first switching elements Q11 to Q16 and the second switching elements Q21 to Q26 is, for example, a semiconductor element composed of an enhanced n-channel MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor).

By the way, in the present embodiment, the first switching elements Q14 to Q16, which are a part of the plurality of first switching elements Q11 to Q16, are the second switching elements Q24 to Q26, which are a part of the plurality of second switching elements Q21 to Q26. It is also used as. Specifically, the three first switching elements Q14 to Q16 of the lower arm of the six first switching elements Q11 to Q16 are the three second of the lower arm of the six second switching elements Q21 to Q26. It is also used for the switching elements Q24 to Q26. On the other hand, the three second switching elements Q21 to Q23 of the upper arm are provided separately from the three first switching elements Q11 to Q13 of the upper arm. The "lower arm" referred to in the present disclosure is a path for passing a current from the load 90 to the negative electrode of the first power supply 91 or the second power supply 92 among the pair of first switching elements or the second switching elements constituting the legs of each phase. It means the above switching element. The "upper arm" referred to in the present disclosure is a path through which a current flows from the positive electrode of the first power supply 91 or the second power supply 92 to the load 90 among the pair of first switching elements or the second switching elements constituting the legs of each phase. It means the above switching element.

Specifically, the drain terminals of the three first switching elements Q11 to Q13 of the upper arm are electrically connected to the positive electrode of the first power supply 91. The drain terminals of the three second switching elements Q21 to Q23 of the upper arm are electrically connected to the positive electrode of the second power supply 92. The drain terminals of the three first switching elements Q14 to Q16 of the lower arm are the source terminals of the three first switching elements Q11 to Q13 of the upper arm and the source terminals of the three second switching elements Q21 to Q23 of the upper arm. Both are electrically connected. The source terminals of the three first switching elements Q14 to Q16 of the lower arm are electrically connected to the negative electrode of the first power supply 91 and the negative electrode of the second power supply 92. As a result, the three first switching elements Q14 to Q16 of the first inverter circuit 11 are also used as the three second switching elements Q24 to Q26 of the second inverter circuit 21.

The control circuit 3 controls at least the first drive circuit 1 and the second drive circuit 2. The control circuit 3 also controls the charging circuit 4 and the pair of switches 51 and 52. In the present embodiment, the control circuit 3 mainly includes, for example, a computer system (including a microcontroller) including a CPU (Central Processing Unit) and a memory. That is, the processor (CPU) functions as the control circuit 3 by executing an appropriate program recorded in the memory.

The control circuit 3 controls the first drive circuit 1, the second drive circuit 2, the charging circuit 4, and the pair of switches 51 and 52 by the control signal. In FIG. 2, it is described that the control circuit 3 controls each of the first drive circuit 1 and the second drive circuit 2 together, but in reality, the control circuit 3 has the first switching elements Q11 to Q16. A control signal is output to each of the second switching elements Q21 to Q26. Since each switching element (each of the first switching elements Q11 to Q16 and the second switching elements Q21 to Q26) is a MOSFET, the control circuit 3 outputs a control signal between the gate terminal and the source terminal of each switching element. Therefore, the control circuit 3 may include a driver for driving each of the plurality of first switching elements Q11 to Q16 and the plurality of second switching elements Q21 to Q26.

The control circuit 3 switches between operation and stop for at least each of the first drive circuit 1 and the second drive circuit 2. Further, the control circuit 3 regenerates the operation mode of each of the first drive circuit 1 and the second drive circuit 2 into the power supply mode and the power supply mode during the operation of the first drive circuit 1 and the second drive circuit 2. Switch between modes.

For example, when the first drive circuit 1 is operated in the power supply mode, the control circuit 3 shifts the three first switching elements Q11 to Q13 of the upper arm corresponding to the U phase, the V phase, and the W phase by 120 degrees. And turn it on. As a result, three-phase alternating current (voltage) of U-phase, V-phase, and W-phase having a phase difference of 120 degrees is applied from the first inverter circuit 11 to the load 90. Similarly, when the second drive circuit 2 is operated in the power supply mode, the control circuit 3 sets the three second switching elements Q21 to Q23 of the upper arm corresponding to the U phase, the V phase, and the W phase by 120 degrees each. Shift it on. As a result, three-phase alternating current (voltage) of U-phase, V-phase, and W-phase having a phase difference of 120 degrees is applied from the second inverter circuit 21 to the load 90. Here, the dead time is set so that the upper arm and the lower arm constituting the same leg do not turn on at the same time, but the dead time is a very short time, and the power supply to the load 90 is supplied. It will not be interrupted.

When the first drive circuit 1 is stopped, the control circuit 3 keeps at least three first switching elements Q11 to Q13 of the upper arm off. When the second drive circuit 2 is stopped, the control circuit 3 keeps at least three second switching elements Q21 to Q23 of the upper arm off.

Here, the control circuit 3 controls the first drive circuit 1 and the second drive circuit 2 so that the first drive circuit 1 and the second drive circuit 2 operate in synchronization with each other. That is, the control circuit 3 synchronizes the first drive circuit 1 and the second drive circuit 2 by controlling the second drive circuit 2 in accordance with the control timing of the first drive circuit 1. In the present embodiment, the first period T1 (see FIG. 4) in which the first drive circuit 1 operates and the second period T2 (see FIG. 4) in which the second drive circuit 2 operates are not overlapped with each other. 1 Drive circuit 1 and 2nd drive circuit 2 operate with each other. That is, the power supply source for the load 90 is selectively selected from the first power supply 91 and the second power supply 92. As a result, the power from the first power supply 91 is supplied to the load 90 in the first period T1, and the power from the second power supply 92 is supplied to the load 90 in the second period T2.

The charging circuit 4 charges the second power supply 92 by supplying electric power from the first power supply 91 to the second power supply 92. The charging circuit 4 operates in synchronization with at least one of the first drive circuit 1 and the second drive circuit 2. That is, in the power supply system 10 of the present embodiment, the second power supply 92 is charged by being supplied with power from the first power supply 91 via the charging circuit 4. The charging circuit 4 includes, for example, an active element such as a transistor (including a MOSFET), and is a circuit controlled by a control signal from the control circuit 3. In the present embodiment, the charging circuit 4 includes, for example, a DC-DC converter such as a step-up circuit, a step-down circuit, or a step-up / down circuit. In the present embodiment, the charging circuit 4 synchronizes with the second drive circuit 2 so that the charging circuit 4 stops the operation in the forward charging mode described later in the second period T2 in which the second drive circuit 2 operates. Operate.

Further, in the present embodiment, the charging circuit 4 has a reverse charging mode for charging the first power supply 91 by supplying electric power from the second power supply 92 to the first power supply 91. That is, the charging circuit 4 has two operation modes, a forward charge mode and a reverse charge mode, as operation modes. The forward charging mode is an operation mode for charging the second power supply 92 by supplying electric power from the first power supply 91 to the second power supply 92. In other words, the charging circuit 4 has a function of passing electric power (electrical energy) in both directions between the first power source 91 and the second power source 92. In the present embodiment, the charging circuit 4 operates in synchronization with the first driving circuit 1 so that the charging circuit 4 stops operating in the reverse charging mode during the first period T1 in which the first driving circuit 1 operates. ..

Here, in the present embodiment, as described above, the second drive circuit 2 has a regenerative mode, and the second power supply 92 can be charged by the regenerative power from the load 90. When the second drive circuit 2 has a regenerative mode as described above, it is preferable to maintain the relative remaining capacity (RSOC: Relative State Of Charge) of the second power supply 92 to, for example, about 50%. The relative remaining capacity referred to in the present disclosure is the remaining capacity (RC: Remaining Capacity) of the second power supply 92 (or the first power supply 91) and the full charge capacity (FCC: Full Charge) of the second power supply 92 (or the first power supply 91). Capacity) is the value divided by. That is, the relative remaining capacity referred to in the present disclosure is synonymous with the charge rate (SOC: State Of Charge). That is, if the relative remaining capacity of the second power supply 92 is maintained at about 50%, sufficient power can be supplied to the load 90 when the second drive circuit 2 operates in the power supply mode. Further, even when the second drive circuit 2 operates in the regenerative mode, sufficient power can be supplied to the second power supply 92. Therefore, in the present embodiment, the charging circuit 4 has a forward charging mode and a reverse charging mode according to the relative remaining capacity of the second power supply 92 so as to maintain the relative remaining capacity of the second power supply 92 at about 50%. , Is preferred.

When the second drive circuit 2 does not have a regenerative mode, it is preferable to maintain the relative remaining capacity of the second power supply 92 at, for example, about 100%. In this case, it is preferable that the charging circuit 4 operates according to the relative remaining capacity of the second power supply 92 so as to maintain the relative remaining capacity of the second power supply 92 at about 100%.

The pair of switches 51 and 52 are inserted in each of the power supply path between the first power supply 91 and the load 90 and the power supply path between the second power supply 92 and the load 90. Specifically, the (first) switch 51 of the pair of switches 51 and 52 is inserted between the positive electrode of the first power supply 91 and the first drive circuit 1. Therefore, the drain terminals of the three first switching elements Q11 to Q13 of the upper arm of the first inverter circuit 11 are connected to the positive electrode of the first power supply 91 via the switch 51. Further, the (second) switch 52 is inserted between the positive electrode of the second power supply 92 and the second drive circuit 2. Therefore, the drain terminals of the three second switching elements Q21 to Q23 of the upper arm of the second inverter circuit 21 are connected to the positive electrode of the second power supply 92 via the switch 52.

The pair of switches 51 and 52 are switched on / off by a control signal from the control circuit 3. That is, the pair of switches 51 and 52 are controlled by the control circuit 3. Here, the pair of switches 51 and 52 are composed of, for example, a contact of a semiconductor relay (SSR: Solid-State Relay) using a semiconductor switching element or a mechanical relay. The control circuit 3 switches on / off the switch 51 according to the operation / stop of the first drive circuit 1. Specifically, the switch 51 is turned on while the first drive circuit 1 is operating, and the switch 51 is turned off while the first drive circuit 1 is stopped. Similarly, the control circuit 3 operates the second drive circuit 2 so that the switch 52 is turned on while the second drive circuit 2 is operating and the switch 52 is turned off while the second drive circuit 2 is stopped. The switch 52 is switched on / off according to the / stop. This makes it possible to prevent a short-circuit current or the like from flowing through the parasitic diodes of the first switching elements Q11 to Q16 or the second switching elements Q21 to Q26.

The detection circuit 6 has a voltage detection circuit 61, a current detection circuit 62, and a temperature detection circuit 63. The voltage detection circuit 61 detects the value of the output voltage (both ends voltage) Vb of the first power supply 91 and the value of the output voltage (both ends voltage) Vc of the second power supply 92. The current detection circuit 62 detects the value of the output current Ib of the first power supply 91 and the value of the output current Ic of the second power supply 92. The temperature detection circuit 63 includes, for example, a temperature detection element such as a thermistor, and detects the temperature of the first power supply 91 and the temperature of the second power supply 92.

Here, in the present embodiment, the drive circuits (first drive circuit 1 and second drive circuit 2) are provided in separate systems for the first power supply 91 and the second power supply 92. Therefore, for example, the voltage detection circuit 61 may directly detect the value of the output voltage Vb of the first power supply 91 from the output of the first power supply 91, or may be obtained from the voltage of a specific portion of the first drive circuit 1. It may be detected indirectly. Similarly, the current detection circuit 62 may detect, for example, the value of the output current Ib of the first power supply 91 directly from the output of the first power supply 91, or the current of a specific portion of the first drive circuit 1. The detection result (voltage value, current value and temperature in this embodiment) in the detection circuit 6 which may be detected more indirectly is input to the control circuit 3. Further, it is preferable that the control circuit 3 is input with the remaining amount information for at least one of the first power supply 91 and the second power supply 92, in addition to the detection result of the detection circuit 6. The "remaining amount information" referred to in the present disclosure is information regarding the remaining capacity of the first power supply 91 or the second power supply 92. Specifically, the remaining amount information is information regarding the relative remaining capacity (RSOC) of the first power supply 91 (or the second power supply 92).

The power supply system 100 having the above-described configuration is mounted on the mobile body 81 of the mobile body 8 as illustrated in FIG. The mobile body 81 has an ECU (Electronic Control Unit) 82 in addition to a load 90 made of an electric motor. The ECU 82 can communicate with the control circuit 3 of the power supply system 100.

The ECU 82 receives, for example, an operation signal generated when the throttle of the mobile body main body 81 is operated by the driver, and transmits a control command to the control circuit 3. It is preferable that the control command transmitted by the ECU 82 to the control circuit 3 is information indicating the operation of the mobile body 81 or the magnitude of the output current to the load 90. As a result, for example, when the driver operates the throttle to start the mobile body 81 while the mobile body 81 is stopped, electric power is supplied from the power supply system 100 to the load 90, and the mobile body is supplied with the load 90. Power (propulsion force) of the main body 81 is generated. Therefore, the moving body 8 travels according to the operation of the driver.

Further, in the present embodiment, as described above, the first drive circuit 1 and the second drive circuit 2 have a regenerative mode as an operation mode, so that the load 90 is applied, for example, when the mobile body main body 81 is braking or decelerating. The regenerative power generated is supplied to the first power supply 91 or the second power supply 92. As a result, the load 90 functions as a generator, and the power supply system 10 can charge at least one of the first power supply 91 and the second power supply 92.

(2.2) Operation Hereinafter, the operation of the power supply system 10 having the above-described configuration will be described.

Here, first, the operation of the power supply system 10 when the operation mode of the first drive circuit 1 and the second drive circuit 2 is the power supply mode will be described with reference to FIG. In FIG. 4, the horizontal axis is the time axis, and the vertical axis represents the magnitude of the electric power output from the power supply system 10 to the load 90. In the example of FIG. 4, it is assumed that the mobile body 81 departs from a stopped state and travels for a while, and the mobile body 81 accelerates, travels at cruising speed, accelerates, and travels at cruising speed. , It is assumed that the switch will be made in this order.

That is, in the example of FIG. 4, the period from the time point t1 to the time point t2 and the period from the time point t3 to the time point t4 represent, for example, a state in which the mobile body body 81 accelerates due to departure, climbing, overtaking, or the like. .. During these periods, the power supply system 10 receives a control command indicating "acceleration" from the ECU 82 in the control circuit 3. At this time, the control circuit 3 stops the first drive circuit 1 and operates the second drive circuit 2. That is, the period from the time point t1 to the time point t2 and the period from the time point t3 to the time point t4 are the second period T2 in which the second drive circuit 2 operates, and the second power source 91 can output a larger current than the first power supply 91. Power will be supplied from the power supply 92 to the load 90.

On the other hand, the period from the time point t2 to the time point t3 and the period after the time point t4 represent the state in which the moving body main body 81 travels at the cruising speed. During these periods, the power supply system 10 receives a control command indicating "cruising" from the ECU 82 in the control circuit 3. At this time, the control circuit 3 operates the first drive circuit 1 and stops the second drive circuit 2. That is, the period from the time point t2 to the time point t3 and the period after the time point t4 are the first period T1 in which the first drive circuit 1 operates, and power is supplied from the first power supply 91 made of a battery to the load 90. become.

However, which of the first drive circuit 1 and the second drive circuit 2 is operated by the control circuit 3 is not determined only by the control command, and the detection result by the detection circuit 6 and the first power supply 91 and the second power supply are determined. It is preferable to determine based on the remaining amount information of 92 and the like. As an example, which of the first power supply 91 and the second power supply 92 is used is determined as shown in Table 1 below depending on the temperature and the magnitude of the current.

That is, in the example of Table 1, when the required output (discharge current) is relatively small and the temperature of the first power supply 91 is normal temperature, such as when the control command is "cruise", The control circuit 3 operates the first drive circuit 1 so as to use the first power supply 91. In other cases, the control circuit 3 operates the second drive circuit 2 so as to use the second power supply 92. "Room temperature" as used in the present disclosure means a temperature in the range of 5 degrees or more and 35 degrees or less. "Low temperature" is a temperature lower than the lower limit of normal temperature (5 degrees). "High temperature" is a temperature higher than the upper limit of normal temperature (35 degrees). However, the range of the above "normal temperature" is only an example, and for example, 10 degrees, which is the lower limit of the appropriate temperature during charging and discharging of the lithium ion battery, is the lower limit of the "normal temperature" and the upper limit of the appropriate temperature. 45 degrees may be set as the upper limit of "normal temperature".

Next, the operation of the power supply system 10 when the operation mode of the first drive circuit 1 and the second drive circuit 2 is the regenerative mode will be described.

For example, during braking or deceleration of the mobile body 81, the power supply system 10 receives a control command indicating “regeneration” from the ECU 82 in the control circuit 3. At this time, the control circuit 3 operates the first drive circuit 1 or the second drive circuit 2 in the regenerative mode.

However, which of the first drive circuit 1 and the second drive circuit 2 is operated by the control circuit 3 is not determined only by the control command, and the detection result by the detection circuit 6 and the first power supply 91 and the second power supply are determined. It is preferable to determine based on the remaining amount information of 92. That is, as in the case of operating in the power supply mode, as an example, whether to use the first power supply 91 or the second power supply 92 is determined as shown in Table 1 above, depending on the temperature and the magnitude of the current.

Therefore, when the required output (charging current) is relatively small and the temperature of the first power supply 91 is normal temperature, the control circuit 3 is a first drive circuit so as to use the first power supply 91. Operate 1. In other cases, the control circuit 3 operates the second drive circuit 2 so as to use the second power supply 92.

Next, the operation of the charging circuit 4 will be described. The control circuit 3 basically charges the charging circuit 4 in order when the relative remaining capacity (RSOC) of the second power supply 92 becomes less than the second threshold value so that the second power supply 92 maintains a substantially fully charged state. Operate in mode. As a result, electric power is supplied from the first power source 91 to the second power source 92, and the second power source 92 is charged. At this time, the charging circuit 4 charges the second power supply 92 by a constant voltage constant current (CVCC) method as an example.

Further, the control circuit 3 reversely charges the charging circuit 4 when the relative remaining capacity (RSOC) of the second power supply 92 is equal to or higher than the second threshold value and the relative remaining capacity (RSOC) of the first power supply 91 becomes less than the first threshold value. Operate in mode. As a result, electric power is supplied from the second power source 92 to the first power source 91, and the first power source 91 is charged. At this time, the charging circuit 4 charges the first power supply 91 by a constant voltage constant current charging method as an example.

Further, in the present embodiment, the charging circuit 4 is controlled by the control circuit 3 so that the charging circuit 4 stops during the second period T2 in which the second drive circuit 2 operates.

(3) Modification Example 1 is only one of various embodiments of the present disclosure. The first embodiment can be changed in various ways depending on the design and the like as long as the object of the present disclosure can be achieved. Further, the same function as that of the power supply system 10 may be realized by a power supply method, a computer program, a non-temporary recording medium on which the program is recorded, or the like. The modifications described below can be applied in combination as appropriate.

(3.1) First Modified Example FIG. 5 shows the configuration of the power supply system 10A according to the first modified example of the first embodiment and the power supply system 100A including the power supply system 10A. Hereinafter, the same configurations as those in the first embodiment will be designated by a common reference numeral and description thereof will be omitted as appropriate. The power supply system 10A shown in FIG. 5 differs from the power supply system 10 according to the first embodiment in the configurations of the first drive circuit 1A, the second drive circuit 2A, and the charging circuit 4A.

First, in the first drive circuit 1A and the second drive circuit 2A, a part of the first switching elements of the plurality of first switching elements Q11 to Q16 is a second part of the plurality of second switching elements Q21 to Q26. It is not also used as a switching element. That is, the first inverter circuit 11A of the first drive circuit 1A has six first switching elements Q11 to Q16. On the other hand, the second inverter circuit 21A of the second drive circuit 2A has six second switching elements Q21 to Q26 in addition to the six first switching elements Q11 to Q16. Therefore, the first drive circuit 1A and the second drive circuit 2A can form a completely independent system.

Further, the charging circuit 4A includes a series circuit of the diode D3 and the resistor R1. The anode terminal of the diode D3 is electrically connected to the positive electrode of the first power supply 91, and the cathode terminal of the diode D3 is electrically connected to the positive electrode of the second power source 92 via the resistor R1. As described above, in the power supply system 10A, the charging circuit 4A is composed of only passive elements (diode D3 and resistor R1), and is not a control target of the control circuit 3. In this charging circuit 4A, when the output voltage Vb of the first power supply 91 becomes larger than the voltage obtained by adding the forward voltage of the diode D3 to the output voltage Vc of the second power supply 92, the first power supply 91 to the second power supply 91 to the second. Power is supplied to the power supply 92 to charge the second power supply 92.

(3.2) Other Modification Examples Hereinafter, modification examples other than the first modification of the first embodiment are listed.

The power supply system 10 in the present disclosure includes, for example, a computer system in the control circuit 3. The computer system mainly consists of a processor and a memory as hardware. The function as the power supply system 10 in the present disclosure is realized by the processor executing the program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunications line, and may be recorded on a non-temporary recording medium such as a memory card, optical disk, hard disk drive, etc. that can be read by the computer system. May be provided. The processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI). A plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips. A plurality of chips may be integrated in one device, or may be distributed in a plurality of devices.

The first power source 91 is not limited to the lithium ion battery, and may be, for example, a lead storage battery, a lithium battery, or the like. Further, the first power supply 91 may be configured by connecting a plurality of cells in series or in parallel.

The second power supply 92 is not limited to the electrochemical device having the above-described configuration, and may be, for example, an electric double layer capacitor or a lithium ion capacitor. Further, the second power supply 92 may be configured by connecting a plurality of cells in series or in parallel.

Further, in the first embodiment, the charging circuit 4 has two operation modes, a forward charging mode and a reverse charging mode, but this configuration is not essential for the power supply system 10, and the charging circuit 4 has at least a configuration. It suffices to have a forward charging mode. That is, in the charging circuit 4, the function of passing electric power (electrical energy) in both directions between the first power supply 91 and the second power supply 92 is not essential, and at least from the first power supply 91 to the second power supply 92. It suffices if the charging circuit 4 has a function of passing electric power (electrical energy).

Further, in the first embodiment, the power supply system 10 includes only two drive circuits, a first drive circuit 1 and a second drive circuit 2, but the power supply system 10 is not limited to this configuration, and the power supply system 10 is a drive circuit. May be provided with three or more. For example, when the power supply system 10 includes a third drive circuit in addition to the first drive circuit 1 and the second drive circuit 2, the first drive circuit 1, the second drive circuit 2, and the third drive circuit are the first. It is electrically connected to the power supply 91, the second power supply 92, and the third power supply, respectively.

Further, the moving body 8 on which the power supply system 100 is mounted is not limited to an electric motorcycle (motorcycle), but may be, for example, an automobile (four-wheeled vehicle), a train, an electric cart, an aircraft, a drone, a construction machine, a ship, or the like. good. Here, the mobile body 8 may include, for example, a prime mover such as an internal combustion engine in the mobile body main body 81 in addition to the load 90 made of an electric motor. In this case, the load 90 may be used, for example, to assist the prime mover. Further, the moving body 8 may be configured to be able to be driven without a driver by automatic driving.

The control circuit 3 may be integrated with the ECU 82 of the mobile body 81. Further, the control circuit 3 may be omitted, and the first drive circuit (1,1A) and the second drive circuit (2,2A) may be controlled by, for example, the ECU 82.

Further, the load 90 is not limited to an AC motor that operates by inputting a three-phase alternating current (voltage) as in the first embodiment, but is, for example, an AC motor that operates by inputting a single-phase alternating current (voltage). It may be. Further, the load 90 is not limited to the electric motor, and may be, for example, equipment other than the electric motor.

Further, the power supply system 10 is not limited to the mobile body 8, and for example, the DC power from a distributed power source such as a solar cell or a storage battery is converted into AC power and used as a load 90 (equipment equipment such as home appliances or a power system). It may be used for an output power conditioner or the like.

Further, each of the first drive circuit 1 and the second drive circuit 2 is not limited to the inverter circuit (first inverter circuit 11 and second inverter circuit 21), for example, a DC-DC converter, an AC-DC converter, or the like, or It may be a combination of these and an inverter circuit. In short, the first drive circuit 1 and the second drive circuit 2 may be configured to supply the power from the first power supply 91 and the second power supply 92 to the load 90, and the function of converting the DC voltage to the AC voltage is the first. 1 It is not essential for the drive circuit 1 and the second drive circuit 2.

Further, the first drive circuit 1 and the second drive circuit 2 may operate in synchronization with each other, and the first period T1 in which the first drive circuit 1 operates and the second period T2 in which the second drive circuit 2 operates , Is not an essential configuration for the power supply system 10. For example, there may be a period during which the first drive circuit 1 and the second drive circuit 2 operate at the same time.

Further, it is not an essential configuration for the power supply system 100 that a plurality of components of the power supply system 100 are housed in one housing, and the components of the power supply system 100 are distributed and provided in the plurality of housings. It may have been. For example, in the power supply system 100, the power supply system 10, the first power supply 91, and the second power supply 92 may be provided in separate housings. Further, a plurality of components of the power supply system 10 may be distributed and provided in a plurality of housings. Further, some functions of the power supply system 10, for example, the functions of the control circuit 3 may be realized by a server system, a cloud (cloud computing), or the like.

Further, each of the first switching elements Q11 to Q16 or the second switching elements Q21 to Q26 is not limited to the enhanced n-channel MOSFET, and may be, for example, an IGBT (Insulated Gate Bipolar Transistor), a thyristor, or the like. Further, each of the first switching elements Q11 to Q16 or the second switching elements Q21 to Q26 may be a semiconductor switching element using a wide bandgap semiconductor material such as GaN (gallium nitride).

(Embodiment 2)
As shown in FIG. 6, the power supply system 10B and the power supply system 100B according to the present embodiment include a pair of diodes D1 and D2 instead of the pair of switches 51 and 52, and the power according to the first embodiment. It differs from the supply system 10 and the power supply system 100.

In the present embodiment, as the operation mode of the first drive circuit 1 and the second drive circuit 2, there is no regenerative mode in which power is supplied from the load 90 to the first power supply 91 and the second power supply 92, respectively. That is, in the present embodiment, the first drive circuit 1 and the second drive circuit 2 supply electric power (electrical energy) only in one direction from the first power supply 91 and the second power supply 92 to the load 90. Therefore, the load 90 does not function as a generator. Further, in the present embodiment, it is not essential that the first power source 91 is a power source (secondary battery) capable of both charging and discharging.

The pair of diodes D1 and D2 are inserted in each of the power supply path between the first power supply 91 and the load 90 and the power supply path between the second power supply 92 and the load 90. Specifically, the (first) diode D1 of the pair of diodes D1 and D2 is inserted between the positive electrode of the first power supply 91 and the first drive circuit 1. Here, the diode D1 is inserted in a direction in which the anode terminal is connected to the positive electrode of the first power supply 91. Further, the (second) diode D2 is inserted between the positive electrode of the second power supply 92 and the second drive circuit 2. Here, the diode D2 is inserted in a direction in which the anode terminal is connected to the positive electrode of the second power supply 92.

This makes it possible to prevent a short-circuit current from flowing through the parasitic diodes of the first switching elements Q11 to Q16 or the second switching elements Q21 to Q26. That is, if there is no pair of diodes D1 and D2, for example, when only the first switching element Q11 is on, the positive electrode and the second of the first power supply 91 are passed through any of the parasitic diodes of the second switching elements Q21 to Q23. The positive electrode of the power supply 92 is short-circuited. According to the pair of diodes D1 and D2, it is possible to prevent the current from flowing back through such a parasitic diode and the short-circuit current from flowing.

The configuration described in the second embodiment can be appropriately combined with the configuration described in the first embodiment (including a modification).

(summary)
As described above, the power supply system (10, 10A, 10B) according to the first aspect includes a first drive circuit (1,1A) and a second drive circuit (2,2A). The first drive circuit (1,1A) is electrically connected to a first power source (91) composed of a battery. The second drive circuit (2, 2A) is electrically connected to a second power supply (92) different from the first power supply (91). The first drive circuit (1,1A) and the second drive circuit (2,2A) operate in synchronization with each other and supply electric power to a common load (90).

According to this aspect, for example, even when the power supply source is switched from the second power supply (92) to the first power supply (91), the first power supply (91) is connected to the first drive circuit (1, 1A). And the state where the second power supply (92) is connected to the second drive circuit (2, 2A) can be maintained. As a result, in the power supply system (10, 10A, 10B), the first drive circuit (1,1A) and the second drive circuit (2,2A) are stopped even when the power supply source is switched. It is possible to continuously supply power to the load (90) without using it.

In the power supply system (10, 10A, 10B) according to the second aspect, in the first aspect, the second power supply (92) can output a larger current than the first power supply (91).

According to this aspect, a larger current can be output to the load (90) by switching the power supply source from the first power supply (91) to the second power supply (92).

In the power supply system (10, 10A, 10B) according to the third aspect, in the first or second aspect, the first period (T1) and the second period (T2) are not overlapped with each other. The drive circuit (1,1A) and the second drive circuit (2,2A) are synchronized with each other. The first period (T1) is a period during which the first drive circuit (1,1A) operates. The second period (T2) is a period during which the second drive circuit (2, 2A) operates.

According to this aspect, the power from the first power supply (91) and the power from the second power supply (92) are not mixed, so that the first power supply (91) and the second power supply (92) are completely separate systems. ) And can be used.

In the power supply system (10, 10A, 10B) according to the fourth aspect, in any one of the first to third aspects, the load (90) is an electric motor.

According to this aspect, for example, when the load (90) is a heavy load such as during acceleration, the electric power from the second power source (92) is supplied to the load (90) with respect to the load (90). Power can be supplied efficiently.

In the power supply system (10, 10A) according to the fifth aspect, in any one of the first to fourth aspects, the first drive circuit (1,1A) and the second drive circuit (2,2A) are in the regeneration mode. Has. The regeneration mode is a mode in which electric power is supplied from the load (90) to the first power source (91) and the second power source (92), respectively.

According to this aspect, the regenerative power (regenerative energy) generated by the load (90) can be effectively used by the first power source (91) and the second power source (92).

The power supply system (10, 10A, 10B) according to the sixth aspect controls the first drive circuit (1,1A) and the second drive circuit (2,2A) in any one of the first to fifth aspects. The control circuit (3) is further provided.

According to this aspect, how to control the first drive circuit (1,1A) and the second drive circuit (2,2A) can be determined by the control circuit (3).

In the power supply system (10, 10A, 10B) according to the seventh aspect, in any one of the first to sixth aspects, the first drive circuit (1,1A) is the first inverter circuit (11, 11A). The second drive circuit (2,2A) has a second inverter circuit (21,21A). The first inverter circuit (11, 11A) converts the DC voltage from the first power supply (91) into an AC voltage and applies it to the load (90). The second inverter circuit (21, 21A) converts the DC voltage from the second power supply (92) into an AC voltage and applies it to the load (90).

According to this aspect, it is possible to cope with a load (90) that operates by applying an AC voltage.

In the power supply system (10, 10B) according to the eighth aspect, in the seventh aspect, the first inverter circuit (11) includes a plurality of first switching elements (Q11 to Q16). The second inverter circuit (21) includes a plurality of second switching elements (Q21 to Q26). The first switching element (Q11 to Q13) of a part of the plurality of first switching elements (Q11 to Q16) is a part of the second switching element (Q21 to Q23) of the plurality of second switching elements (Q21 to Q26). It is also used as.

According to this aspect, the total number of switching elements can be suppressed to be smaller in the first inverter circuit (11) and the second inverter circuit (21) than in the case where the switching elements are individually provided.

In the power supply system (10, 10A, 10B) according to the ninth aspect, in any one of the first to eighth aspects, the second power source (92) is a capacitor.

According to this aspect, a power source having a higher output density than the first power source (91) can be used as the second power source (92).

The power supply system (10, 10B) according to the tenth aspect is the second aspect by supplying electric power from the first power source (91) to the second power source (92) in any one of the first to ninth aspects. A charging circuit (4) for charging the power source (92) is further provided. The charging circuit (4) operates in synchronization with at least one of the first drive circuit (1) and the second drive circuit (2).

According to this aspect, by distributing the electric power of the first power source (91) to the second power source (92), the electric power of the first power source (91) and the second power source (92) can be effectively used.

In the power supply system (10, 10B) according to the eleventh aspect, in the tenth aspect, the charging circuit (4) supplies power from the second power source (92) to the first power source (91). It has a reverse charge mode for charging the first power source (91).

According to this aspect, by distributing the electric power of the second power source (92) to the first power source (91), the electric power of the first power source (91) and the second power source (92) can be effectively used.

The power supply system (10, 10A) according to the twelfth aspect further comprises a pair of switches (51, 52) in any one of the first to eleventh aspects. The pair of switches (51, 52) is a power supply path between the first power supply (91) and the load (90), and a power supply path between the second power supply (92) and the load (90). It is inserted in each of.

According to this aspect, it is possible to prevent the generation of short-circuit current and the like.

In the power supply system (10, 10A) according to the thirteenth aspect, in any one of the first to twelfth aspects, the first power source (91) is a lithium ion battery or a lead storage battery. The second power source (92) is an electrochemical device or an electric double layer capacitor. The electrochemical device includes a positive electrode member, a negative electrode member, and a non-aqueous electrolytic solution. The positive electrode member has a positive electrode current collector and a positive electrode material layer supported on the positive electrode current collector and containing a positive electrode active material. The positive electrode material layer contains a positive electrode active material. The positive electrode active material has a fibrous or granular inner core portion containing the first conductive polymer, and a fibrous or granular surface layer portion covering at least a part of the inner core portion. The surface layer portion contains a second conductive polymer different from the first conductive polymer.

According to this aspect, the first power source (91) having a higher energy density than the second power source (92) and the second power source (92) having a higher output density than the first power source (91). Can be used effectively.

The power supply system (100, 100A, 100B) according to the fourteenth aspect includes the power supply system (10, 10A, 10B) according to any one of the first to thirteenth aspects, the first power supply (91), and the second. It is equipped with a power supply (92).

According to this aspect, for example, even when the power supply source is switched from the second power supply (92) to the first power supply (91), the first power supply (91) is connected to the first drive circuit (1, 1A). And the state where the second power supply (92) is connected to the second drive circuit (2, 2A) can be maintained. As a result, in the power supply system (100, 100A, 100B), the first drive circuit (1,1A) and the second drive circuit (2,2A) are not stopped even when the power supply source is switched. In addition, it is possible to continuously supply electric power to the load (90).

The mobile body (8) according to the fifteenth aspect includes a power supply system (100, 100A, 100B) according to the fourteenth aspect, and a mobile body main body (81) having a load (90).

According to this aspect, for example, even when the power supply source is switched from the second power supply (92) to the first power supply (91), the first power supply (91) is connected to the first drive circuit (1, 1A). And the state where the second power supply (92) is connected to the second drive circuit (2, 2A) can be maintained. As a result, in the mobile body (8), even when the power supply source is switched, the load (1,1A) and the second drive circuit (2,2A) are not stopped. It is possible to continuously supply electric power to 90).

The configurations according to the second to thirteenth aspects are not essential configurations for the power supply system (10, 10A, 10B) and can be omitted as appropriate.

1,1A 1st drive circuit 2,2A 2nd drive circuit 3 Control circuit 4,4A Charging circuit 8 Mobile 10,10A, 10B Power supply system 11,11A 1st inverter circuit 21,21A 2nd inverter circuit 51, 52 Switch 81 Mobile body 90 Load 91 1st power supply 92 2nd power supply 100, 100A, 100B Power supply system Q11 to Q16 1st switching element Q21 to Q26 2nd switching element T1 1st period T2 2nd period

Claims (13)

A first drive circuit that is electrically connected to a first power supply consisting of batteries,
A second drive circuit electrically connected to a second power source different from the first power source is provided.
The first drive circuit and the second drive circuit operate in synchronization with each other to supply power to a common load .
The first drive circuit has a first inverter circuit that converts a DC voltage from the first power supply into an AC voltage and applies it to the load.
The second drive circuit has a second inverter circuit that converts a DC voltage from the second power supply into an AC voltage and applies it to the load.
The first inverter circuit includes a plurality of first switching elements.
The second inverter circuit includes a plurality of second switching elements.
The first switching element, which is a part of the plurality of first switching elements, is also used as the second switching element, which is a part of the plurality of second switching elements.
Power supply system. The power supply system according to claim 1, wherein the second power supply can output a larger current than the first power supply. Claim 1 in which the first drive circuit and the second drive circuit are synchronized with each other so that the first period in which the first drive circuit operates and the second period in which the second drive circuit operates do not overlap. Or the power supply system according to 2. The power supply system according to any one of claims 1 to 3, wherein the load is an electric motor. The power supply according to any one of claims 1 to 4, wherein the first drive circuit and the second drive circuit have a regenerative mode in which power is supplied from the load to the first power supply and the second power supply, respectively. system. The power supply system according to any one of claims 1 to 5, further comprising a control circuit for controlling the first drive circuit and the second drive circuit. The second power source is a capacitor.
The power supply system according to any one of claims 1 to 6. A charging circuit for charging the second power source by supplying electric power from the first power source to the second power source is further provided.
The charging circuit operates in synchronization with at least one of the first drive circuit and the second drive circuit.
The power supply system according to any one of claims 1 to 7. The charging circuit has a reverse charging mode for charging the first power source by supplying electric power from the second power source to the first power source.
The power supply system according to claim 8. It further comprises a pair of switches inserted in each of the power supply path between the first power source and the load and the power supply path between the second power source and the load.
The power supply system according to any one of claims 1 to 9. The first power source is a lithium ion battery or a lead storage battery.
The second power source is an electrochemical device including a positive electrode member, a negative electrode member, and a non-aqueous electrolytic solution, or an electric double layer capacitor.
The positive electrode member has a positive electrode current collector and a positive electrode material layer supported on the positive electrode current collector and containing a positive electrode active material.
The power supply system according to any one of claims 1 to 10. The power supply system according to any one of claims 1 to 11.
With the first power supply
The second power source is provided.
Power system. The power supply system according to claim 12,
A mobile body having the load and
Mobile body.

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