Power system and power control program

Abstract

To provide a power supply system capable of using a single phase battery charger in a simple circuit configuration, and a power supply control program.SOLUTION: A power supply system 100 which can be connected to a single phase battery charger 42 has a positive electrode side power supply path H1, a negative electrode side power supply path L1, and a rectification member 15. The rectification member 15 is configured by connecting a first diode D1 and a second diode D2 in series. While allowing current to flow from the negative electrode side power supply path L1 to the positive electrode side power supply path H1, it limits the current to flow from the positive electrode side power supply path H1 to the negative electrode side power supply path L1. Out of two connection terminals which the single phase battery charger 42 has, the first connection terminal can be electrically connected to a middle point of armature coils 11a-11c of a motor 11 through an AC terminal Tac1, and the second connection terminal can be electrically connected between the first diode D1 and the second diode D2 through an AC terminal Tac2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a power supply system and a power control program.

Background Art

[0002] Conventionally, there is known a device in which a part of a leg constituting an inverter for driving a motor is diverted as a part of a DC / AC conversion circuit for battery charging, thereby reducing the size of the entire device. Such a device is shown in, for example, Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, currently, chargers for charging a vehicle battery include a three-phase charger that requires high power but can perform rapid charging, and a single-phase charger that cannot perform rapid charging but is easy to install even in a general household. In the future, although the number of three-phase chargers is expected to increase as vehicle chargers, the possibility of using single-phase chargers is also high. In particular, when a three-phase charger is not present nearby, the possibility of using a single-phase charger is high. On the other hand, since the possibility of mainly using a three-phase charger is high, it is not desirable to complicate the configuration of the device only to enable the use of a single-phase charger.

[0005] The present invention has been made in view of the above circumstances, and its main object is to provide a power supply system and a power control program that can use a single-phase charger with a simple circuit configuration.

Means for Solving the Problems

[0006] The first means is a power supply system connectable to a single-phase charger, comprising a storage battery, an inverter, and a motor connected to the storage battery via the inverter, wherein the power supply system comprises a positive-side power supply path provided between the positive terminal of the storage battery and the high-potential-side terminal of the inverter, a negative-side power supply path provided between the negative terminal of the storage battery and the low-potential-side terminal of the inverter, and a rectifier member configured by connecting a first rectifier and a second rectifier in series, which allows current to flow from the negative-side power supply path to the positive-side power supply path, while restricting current to flow from the positive-side power supply path to the negative-side power supply path, wherein of the two connection terminals of the single-phase charger, the first connection terminal is electrically connectable to the neutral point of the armature winding of the motor, and the second connection terminal is electrically connectable between the first rectifier and the second rectifier.

[0007] This allows for the use of a single-phase charger with a simple configuration, requiring only the addition of a rectifier component.

[0008] The second means comprises a battery, an inverter, and a motor connected to the battery via the inverter, and in a power control program implemented by a power control device of a power system connectable to a single-phase charger, the power system comprises a positive-side power path provided between the positive terminal of the battery and the high-potential-side terminal of the inverter, a negative-side power path provided between the negative terminal of the battery and the low-potential-side terminal of the inverter, and a rectifier member configured by connecting a first rectifier and a second rectifier in series, which allows current to flow from the negative-side power path to the positive-side power path, and of the two connection terminals of the single-phase charger, the first connection terminal is electrically connectable to the neutral point of the armature winding of the motor, and the second connection terminal is electrically connectable between the first rectifier and the second rectifier, and the power control device is instructed to perform a process to control the inverter so as to convert the alternating current input from the single-phase charger into a direct current.

[0009] This allows for the use of a single-phase charger with a simple configuration, requiring only the addition of a rectifier component. [Brief explanation of the drawing]

[0010] [Figure 1] Configuration diagram of the power supply system according to the first embodiment. [Figure 2] A schematic diagram showing the casing of the battery pack. [Figure 3] A flowchart showing the charging process. [Figure 4] Configuration diagram of the power supply system according to the second embodiment. [Figure 5] A flowchart showing the procedure for the charging process in the second embodiment. [Figure 6] A diagram illustrating the configuration of the power supply system in a modified example. [Figure 7] A diagram illustrating the configuration of the power supply system in a modified example. [Modes for carrying out the invention]

[0011] Multiple embodiments and modifications will be described with reference to the drawings. Between multiple embodiments and modifications, functionally and / or structurally corresponding and / or related parts may be assigned the same reference numeral, or reference numerals with a difference of hundreds or more digits. For corresponding and / or related parts, refer to the descriptions of other embodiments and modifications.

[0012] <First Embodiment> The following describes a first embodiment of the power supply system described herein, with reference to the drawings. The power supply system 100 of this embodiment is installed in a vehicle such as an electric vehicle or a hybrid vehicle.

[0013] As shown in Figure 1, the power supply system 100 comprises a drive unit 10, a battery pack 20 as a power supply device, and a control device 50 as a power control device. The drive unit 10 is connected to the battery pack 20 via a positive-side power supply path H1 and a negative-side power supply path L1, and power is supplied from the battery pack 20. The drive unit 10 is also configured to be connectable to a single-phase charger 42 as an external charger, and power supplied from the single-phase charger 42 can be supplied to the battery pack 20 via the drive unit 10. Each component will be described in detail below.

[0014] First, let's describe the drive unit 10. The drive unit 10 includes a motor 11 and an inverter 12. The motor 11 is a three-phase synchronous machine and is equipped with star-connected U, V, and W phase armature windings 11a to 11c and a rotor (not shown). The armature windings 11a to 11c of each phase are arranged with an electrical angle offset of 120°. The motor 11 is, for example, a permanent magnet type synchronous machine. The rotor is capable of transmitting power to the vehicle's drive wheels. Therefore, the motor 11 is the source of torque that drives the vehicle.

[0015] The inverter 12 is a three-phase full-bridge inverter equipped with three series connections (hereinafter referred to as "legs") of upper arm switches SWH and lower arm switches SWL, which are connected in parallel. An upper arm diode DH, which is a freewheeling diode, is connected in antiparallel (reverse polarity) to the upper arm switch SWH, and a lower arm diode DL, which is a freewheeling diode, is connected in antiparallel to the lower arm switch SWL. In this embodiment, each switch SWH and SWL is a semiconductor switch element, for example, an IGBT, but it may also be a MOSFET.

[0016] The inverter 12 is equipped with a smoothing capacitor 13. The high-potential terminal of the smoothing capacitor 13 is connected to the positive-side power supply path H1. The low-potential terminal of the smoothing capacitor 13 is connected to the negative-side power supply path L1. The smoothing capacitor 13 may be provided outside the inverter 12.

[0017] In each phase, the first ends of the armature windings 11a to 11c are connected to the connection point between the emitter, which is the low-potential side terminal of the upper arm switch SWH, and the collector, which is the high-potential side terminal of the lower arm switch SWL, via a conductive member 14 such as a bus bar. And the second ends of the armature windings 11a to 11c of each phase are connected to each other at the neutral point.

[0018] The collector of the upper arm switch SWH of each phase is connected to the positive power supply path H1. The emitter of the lower arm switch SWL of each phase is connected to the negative power supply path L1. Thereby, the inverter 12 is connected to the battery pack 20 via the positive power supply path H1 and the negative power supply path L1.

[0019] By the way, this drive unit 10 is configured to be connectable to a single-phase charger 42, which is an external charger. More specifically, the neutral point of the armature windings 11a to 11c of each phase is connected to the AC terminal Tac1 of the power supply system 100.

[0020] Also, inside the drive unit 10, a rectifying member 15 in which two diodes D1 and D2 are connected in series is provided between the positive power supply path H1 and the negative power supply path L1. The cathode of the first diode D1 constituting the rectifying member 15 is connected to the positive power supply path H1, and the anode of the first diode D1 is connected to the cathode of the second diode D2. And the anode of the second diode D2 is connected to the negative power supply path L1. Thereby, the diodes D1 and D2 permit current to flow from the negative power supply path L1 to the positive power supply path H1, while restricting current from flowing from the positive power supply path H1 to the negative power supply path L1. The first diode D1 corresponds to the first rectifier, and the second diode D2 corresponds to the second rectifier. The connection point P1 between the first diode D1 and the second diode D2 is connected to the AC terminal Tac2 of the power supply system 100. These AC terminals Tac1 and Tac2 can be connected to a single-phase charger 42 (single-phase AC power supply) as an external charger.

[0021] Furthermore, the electrical paths between the neutral point and AC terminal Tac1, and the electrical paths between connection point P1 and AC terminal Tac2, are provided with charger-side relay switches SW1 and SW2, respectively, which switch between energizing and disconnecting the power. In this embodiment, charger-side relay switches SW1 and SW2 are mechanical relays. When SW1 and SW2 are turned off, they block the flow of current in both directions, and when turned on, they allow the flow of current in both directions. Note that charger-side relay switches SW1 and SW2 are not limited to mechanical relays, but may also be semiconductor switching elements, for example.

[0022] The battery pack 20 comprises a rechargeable battery 21, a DC-DC converter 22 (an isolated voltage conversion circuit), a positive-side main switch SMRH (first switch) provided in the positive-side power supply path H1, a negative-side main switch SMRL (second switch) provided in the negative-side power supply path L1, and a housing 23 that houses them.

[0023] The battery 21 serves as a power source for rotating the rotor of the motor 11. The battery 21 is a battery pack configured as a series connection of individual battery cells. The positive terminal of the battery 21 is connected to the positive-side power supply path H1, and the negative terminal is connected to the negative-side power supply path L1. The terminal voltages (e.g., rated voltages) of each battery cell constituting the battery pack are set to be the same, for example. The battery cells are secondary batteries such as lithium-ion batteries.

[0024] The positive terminal main switch SMRH is a switch that switches the power supply on and off of the positive terminal power supply path H1 connecting the battery 21 and the inverter 12. Similarly, the negative terminal main switch SMRL is a switch that switches the power supply on and off of the negative terminal power supply path L1 connecting the battery 21 and the inverter 12.

[0025] In this embodiment, the main switches SMRH and SMRL are mechanical relays. When the main switches SMRH and SMRL are turned off, they block the flow of current in both directions, and when they are turned on, they allow the flow of current in both directions. Note that the positive terminal main switch SMRH and the negative terminal main switch SMRL are not limited to mechanical relays, but may also be semiconductor switching elements, for example.

[0026] The DC-DC converter 22 comprises a primary circuit 31, a secondary circuit 32, and a transformer 33. One of the primary circuit 31 and the secondary circuit 32 is the input section, and the other is the output section. The input and output sections of the DC-DC converter 22 can be swapped as appropriate depending on their function.

[0027] The transformer 33 comprises a primary winding 34, a core 35, and a secondary winding 36 that is magnetically coupled to the primary winding 34 via the core 35. A primary circuit 31 is connected to the primary winding 34 of the transformer 33, and a secondary circuit 32 is connected to the secondary winding 36 of the transformer 33.

[0028] The primary circuit 31 is a single-phase full-bridge circuit and comprises two series connections (legs) of an upper arm switch SWH and a lower arm switch SWL, which are connected in parallel. An upper arm diode DH, which is a freewheeling diode, is connected in antiparallel (reverse polarity) to the upper arm switch SWH, and a lower arm diode DL, which is a freewheeling diode, is connected in antiparallel to the lower arm switch SWL. In this embodiment, each switch SWH and SWL is a semiconductor switch element, and may be an IGBT or a MOSFET.

[0029] The first end of the primary winding 34 is connected to the first leg of the two legs that make up the primary circuit 31, and the remaining second end is connected to the second leg of the two legs that make up the primary circuit 31. More specifically, in each leg, the ends of the primary winding 34 are connected to the connection point between the upper arm switch SWH and the lower arm switch SWL. The secondary circuit 32 is configured in the same way as the primary circuit 31, so a detailed explanation is omitted.

[0030] Furthermore, the collectors (high-potential terminals) of each upper arm switch SWH constituting the primary circuit 31 are connected via the high-potential electrical path H11 to the positive-side power supply path H1 between the positive-side main switch SMRH and the inverter 12. In addition, the collectors (high-potential terminals) of each upper arm switch SWH constituting the secondary circuit 32 are connected via the high-potential electrical path H12 to the positive-side power supply path H1 between the positive-side main switch SMRH and the positive terminal of the battery 21.

[0031] In other words, the first end of the positive terminal main switch SMRH is connected to the high-potential electrical path H11 of the primary circuit 31, and the second end of the main switch SMRH is connected to the high-potential electrical path H12 of the secondary circuit 32.

[0032] Similarly, the emitters (low-potential terminals) of each lower arm switch SWL constituting the primary circuit 31 are connected via the low-potential electrical path L11 to the negative-side power supply path L1 between the negative-side main switch SMRL and the inverter 12. In addition, the emitters (low-potential terminals) of each lower arm switch SWL constituting the secondary circuit 32 are connected via the low-potential electrical path L12 to the negative-side power supply path L1 between the negative-side main switch SMRL and the negative terminal of the battery 21.

[0033] In other words, the first end of the negative terminal main switch SMRL is connected to the low-potential electrical path L11 of the primary circuit 31, and the second end of the main switch SMRL is connected to the low-potential electrical path L12 of the secondary circuit 32.

[0034] Next, the housing 23 of the battery pack 20 will be described. As shown in Figures 1 and 2, the housing 23 is configured to house the storage battery 21, the DC-DC converter 22, the main switches SMRH and SMRL, at least a portion of the positive electrode power supply path H1, and at least a portion of the negative electrode power supply path L1. It is desirable that the housing 23 houses the contents in a way that prevents external contact, but it is acceptable for a portion to be exposed. The housing 23 may be made of metal such as aluminum, or it may be made of resin. Also, as shown in Figure 2, a part of the vehicle body (floor 23a in Figure 2) may be used as a cover member to close the opening of the housing 23.

[0035] Next, the control device 50 will be described. The control device 50 may be housed inside the battery pack 20, that is, inside the housing 23, or it may be located outside. The control device 50 of the power supply system 100 is mainly composed of a microcontroller, which has a CPU. The functions provided by the microcontroller can be provided by software recorded in a physical memory device and a computer that executes it, by software only, by hardware only, or by a combination thereof.

[0036] For example, when a microcontroller is provided by hardware electronic circuits, it can be provided by digital circuits containing numerous logic circuits, or by analog circuits. For example, a microcontroller executes a program stored in a non-transitory tangible storage medium, which serves as its own memory. The program includes, for example, a program for processing (power control program) as shown in Figure 2, which will be described later. When the program is executed, the method corresponding to the program is executed. The memory is, for example, non-volatile memory. The program stored in the memory can be updated via a communication network such as the Internet, for example, via OTA (Over The Air).

[0037] The control device 50 controls the switching of switches SWH and SWL that make up the inverter 12 in order to feed back the control amount of the motor 11 to a command value based on the detected values ​​of various sensors (voltage sensor, current sensor, rotation angle sensor, etc.) not shown. The control amount is, for example, torque. In each phase, the upper arm switch SWH and the lower arm switch SWL are turned on alternately. Through this feedback control, the rotational power of the rotor is transmitted to the drive wheels, and the vehicle moves.

[0038] Furthermore, when the single-phase charger 42 is connected, the control device 50 performs a charging process related to charging control based on the battery state of the storage battery 21. The charging process is performed at predetermined intervals when the vehicle is stopped and the storage battery 21's State of Charge (SOC) is below a threshold. Specifically, as shown in Figure 3, when the main switches SMRH and SMRL are off, the control device 50 determines whether or not the single-phase charger 42 is connected (step S101). If this determination result is negative, the charging process is terminated.

[0039] On the other hand, if the determination result of step S101 is positive, the control device 50 turns on the charger-side relay switches SW1 and SW2 and controls the switches SWH and SWL of the inverter 12 to convert the power from the single-phase charger 42 (step S102). Specifically, the control device 50 controls the switches SWH and SWL of the inverter 12 to convert the alternating current to a direct current. At that time, the control device 50 uses the armature windings 11a to 11c of the motor 11, the legs, diodes D1 and D2, and the smoothing capacitor 13 that make up the inverter 12 as a power factor correction (PFC) circuit and converts the alternating current to a direct current so as to bring the power factor closer to 1.0 or reduce the high-frequency components.

[0040] In step S102, the control device 50 controls the DC-DC converter 22 to input the power converted by the inverter 12 into the battery 21 for charging (step S103). More specifically, the control device 50 operates the DC-DC converter 22 to appropriately convert the voltage of the DC current input from the drive unit 10 via the power supply paths H1 and L1, and inputs it into the battery 21 for charging. After charging is complete, the charging process is terminated.

[0041] The above configuration produces the following effects:

[0042] Of the two connection terminals on the single-phase charger 42, the first connection terminal can be electrically connected to the neutral point of the armature windings 11a to 11c of the motor 11 via the AC terminal Tac1, and the second connection terminal can be electrically connected between the first diode D1 and the second diode D2 via the AC terminal Tac3. As a result, the control device 50 can convert the AC current from the single-phase charger 42 into DC current using the armature windings 11a to 11c of the motor 11, the legs, diodes D1 and D2, and the smoothing capacitor 13 that constitute the inverter 12. Furthermore, in doing so, the control device 50 can use the armature windings 11a to 11c of the motor 11, the legs, diodes D1 and D2, and the smoothing capacitor 13 that constitute the inverter 12 as a power factor correction circuit to convert the AC current into DC current in a way that brings the power factor closer to 1.0 or reduces high-frequency components.

[0043] Thus, with a simple configuration such as a rectifier member 15 in which a first diode D1 and a second diode D2 are connected in series, the power factor can be adjusted and the current converted without the need for circuits such as a power factor correction circuit or an AC / DC converter.

[0044] The first end of the positive terminal main switch SMRH is connected to the high-potential electrical path H11 of the primary circuit 31, and the second end is connected to the high-potential electrical path H12 of the secondary circuit 32. Similarly, the first end of the negative terminal main switch SMRL is connected to the low-potential electrical path L11 of the primary circuit 31, and the second end is connected to the low-potential electrical path L12 of the secondary circuit 32.

[0045] Therefore, the battery 21 can be charged by converting the voltage of the DC current converted by the inverter 12 using the DC-DC converter 22 while the main switches SMRH and SMRL are off, i.e., while they are isolated. Consequently, the main switches SMRH and SMRL, which are used to interrupt the flow of power between the power supply paths H1 and L1 located outside the housing 23 and the battery 21, can be repurposed to interrupt the flow of power between the battery 21 and the inverter 12 when using the DC-DC converter 22. This reduces the number of switches, simplifying and miniaturizing the device.

[0046] (Second Embodiment) A second embodiment will now be described. In the power supply system 200 of the second embodiment, as shown in Figure 4, an auxiliary battery 121 is provided in addition to the main battery 21. The auxiliary battery 121 is generally a lower-voltage battery than the main battery 21, and is a secondary battery such as a lead-acid battery. The auxiliary battery 121 is not usually used to supply power to the motor 11, but is used to supply power to auxiliary equipment (such as air conditioners and lights).

[0047] Furthermore, the power supply system 200 includes a DC-DC converter 222 connected to an auxiliary battery 121, and the auxiliary battery 121 is connected to power supply paths H1 and L1 via the DC-DC converter 222. More specifically, the DC-DC converter 222 is an isolated voltage conversion circuit, similar to the DC-DC converter 22 in the first embodiment, and the high-potential side electrical path H112 of the secondary circuit 232 of the DC-DC converter 222 is connected to the positive-side power supply path H1. More specifically, the high-potential side electrical path H112 is connected to the positive-side power supply path H1 between the positive-side main switch SMRH and the inverter 12.

[0048] Similarly, the low-potential electrical path L112 of the secondary circuit 232 of the DC-DC converter 222 is connected to the negative-side power supply path L1. More specifically, the low-potential electrical path L112 is connected to the negative-side power supply path L1 between the negative-side main switch SMRL and the inverter 12.

[0049] On the other hand, the high-potential electrical path H111 of the primary circuit 231 of the DC-DC converter 222 is connected to the positive terminal of the auxiliary battery 121, and the low-potential electrical path L111 is connected to the negative terminal of the auxiliary battery 121. The configuration of the DC-DC converter 222 (primary circuit 231, secondary circuit 232, and transformer 33) is the same as the configuration of the DC-DC converter 22 of the first embodiment (primary circuit 31, secondary circuit 32, and transformer 33), so a detailed explanation is omitted.

[0050] Incidentally, the power supply system 200 of the second embodiment is configured to account for cases where the DC-DC converter 22, as in the first embodiment, cannot be used properly. Cases where it cannot be used properly include, for example, when the DC-DC converter 22 cannot be used due to a malfunction, or when the power supply system 200 is not equipped with a DC-DC converter 22 like the one in the first embodiment. In the power supply system 200 of the second embodiment, in this case, the auxiliary battery 121 is first charged by the single-phase charger 42, and then power is supplied from the auxiliary battery 121 to the battery 21 to charge it.

[0051] The charging process of the second embodiment will be explained in detail with reference to Figure 5. The charging process is performed at predetermined intervals when the vehicle is stopped and the State of Charge (SOC) of the battery 21 is below a threshold.

[0052] When the main switches SMRH and SMRL are turned off, the control device 50 determines whether or not the single-phase charger 42 is connected (step S201). If the result of this determination is negative, the charging process is terminated.

[0053] On the other hand, if the determination result of step S201 is positive, the control device 50 determines whether the State of Charge (SOC) of the auxiliary battery 121 is equal to or greater than a predetermined value (step S202). The predetermined value is set to a value that indicates that it is sufficient to supply power from the auxiliary battery 121 to the battery 21.

[0054] If this determination result is negative, the control device 50 turns on the charger-side relay switches SW1 and SW2 and controls the switches SWH and SWL of the inverter 12 to convert the power from the single-phase charger 42 (step S203). Specifically, the control device 50 converts the alternating current to a direct current. At that time, the control device 50 uses the armature windings 11a to 11c of the motor 11, the legs, diodes D1 and D2, and the smoothing capacitor 13 that make up the inverter 12 as a power factor correction circuit and converts the alternating current to a direct current so as to bring the power factor closer to 1.0 or reduce the high-frequency components.

[0055] Along with the processing in step S203, the control device 50 controls the DC-DC converter 222 to input the power converted by the inverter 12 into the auxiliary battery 121 for charging (step S204). More specifically, the control device 50 operates the DC-DC converter 222 to appropriately convert the voltage of the DC current input from the drive unit 10 via the power supply paths H1 and L1, and inputs it into the auxiliary battery 121 for charging. These processes in steps S203 and S204 correspond to the first process. After a predetermined time has elapsed since charging, the control device 50 performs the process in step S202.

[0056] On the other hand, if the result of step S202 is positive (the SOC of the auxiliary battery 121 is above a predetermined value), the control device 50 turns off the charger-side relay switches SW1 and SW2 and turns on the main switches SMRH and SMRL (step S205).

[0057] Subsequently, the control device 50 controls the DC-DC converter 222 to appropriately convert the voltage of the DC current from the auxiliary battery 121 and input it to the battery 21 for charging (step S206). After charging is complete, the charging process ends. The process in step S206 corresponds to the second process. If the state of charge (SOC) of the auxiliary battery 121 falls below a predetermined lower limit during the process in step S206, the auxiliary battery 121 may be charged again by the single-phase charger 42. In other words, the process may proceed to step S203.

[0058] The above configuration produces the following effects:

[0059] In the power supply system 200, the power input from the single-phase charger 42 is first used to charge the auxiliary battery 121, and then the voltage of the DC current from the auxiliary battery 121 is converted by the DC-DC converter 222 and input to the battery 21 for charging. This allows the battery 21 to be charged using the single-phase charger 42 even when the DC-DC converter 22 cannot be properly utilized as in the first embodiment.

[0060] (modified version) Some of the configurations of the power supply systems 100 and 200 in the above embodiment may be changed. The following are examples of modified configurations.

[0061] The rectifier member 15 in the above embodiment is configured by connecting a first rectifier and a second rectifier in series, and its configuration can be arbitrarily changed as long as it allows current to flow from the negative-side power supply path L1 to the positive-side power supply path H1, while restricting current to flow from the positive-side power supply path H1 to the negative-side power supply path L1.

[0062] The first and second rectifiers in the above embodiment may be configured, for example, as shown in Figure 6, with a semiconductor switch and a diode connected in antiparallel to the semiconductor switch, respectively. That is, a leg 115, which is a series connection of an upper arm switch Sp with an upper arm diode Dp connected in antiparallel and a lower arm switch Sn with a lower arm diode Dn connected in antiparallel, may be used as the rectifier member. This leg 115 is connected to the power supply paths H1 and L1 so as to be in parallel with the inverter 12. The AC terminal Tac2 is connected to the connection point between the upper arm diode Dp and the lower arm diode Dn.

[0063] When configured as shown in Figure 6, the single-phase charger 42 can charge the battery 21, and the REG 115 and inverter 12 can convert the output power from the battery 21 into alternating current and supply it to external devices connected to the AC terminals Tac1 and Tac2.

[0064] ·As the rectifier member 15 in the above embodiment, a rectifier member included in the field winding circuit of a wound-field synchronous motor may be used. This will be explained in detail. The power supply system shown in Figure 7 includes a motor 111 of a wound-field synchronous motor. The motor 111 includes a field winding 301 arranged opposite to the armature windings 111a to 111c of the motor 111, and a field winding circuit 302 that controls the direction of the field current flowing through the field winding 301.

[0065] The field winding circuit 302 includes a first series connection in which a lower arm diode Dn1 is connected in series to an upper arm switch Sp1 to which an upper arm diode Dp1 is connected in antiparallel, and a second series connection in which a lower arm switch Sn2 to which a lower arm diode Dn2 is connected in antiparallel to an upper arm diode Dp2. The anodes of the upper arm diodes Dp1 and Dp2 are connected to the cathodes of the lower arm diodes Dn1 and Dn2, respectively.

[0066] This field winding circuit 302 is connected in parallel to the inverter 12 to the positive-side power supply path H1 and the negative-side power supply path L1. That is, the first series connection and the second series connection of the field winding circuit 302 are connected in parallel between the positive-side power supply path H1 and the negative-side power supply path L1. In this configuration, the cathodes of the upper arm diodes Dp1 and Dp2 are connected to the positive-side power supply path H1, and the anodes of the lower arm diodes Dn1 and Dn2 are connected to the negative-side power supply path L1.

[0067] Furthermore, the first end of the field winding 301 is connected to the connection point P31 between the upper arm diode Dp1 and the lower arm diode Dn1, and the second end is connected to the connection point P32 between the upper arm diode Dp2 and the lower arm diode Dn2.

[0068] The AC terminal Tac2 is connected to the connection point P31 between the upper arm diode Dp1 and the lower arm diode Dn1. In other words, it is connected to the electrical path between the first end of the field winding 301 and the connection point P31 between the upper arm diode Dp1 and the lower arm diode Dn1. Alternatively, the AC terminal Tac2 may also be connected to the connection point P32 between the upper arm diode Dp2 and the lower arm diode Dn2.

[0069] The control device 50 is configured to control the on / off state of the upper arm switch Sp1 and the lower arm switch Sn2 of the field winding circuit 302, and is configured to control the direction of the field current by controlling the on / off state of these switches. Furthermore, when charging the storage battery 21 (or auxiliary storage battery 121), the control device 50 controls the field winding circuit 302 and the inverter 12 to convert the DC current from the single-phase charger 42 into AC current and charge the storage battery 21.

[0070] In the first embodiment described above, it is not necessary to provide the DC-DC converter 22. The control unit and its method described herein may be implemented by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. Alternatively, the control unit and its method described herein may be implemented by a dedicated computer provided by configuring a processor by one or more dedicated hardware logic circuits. Alternatively, the control unit and its method described herein may be implemented by one or more dedicated computers configured by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by the computer on a computer-readable non-transitional tangible recording medium.

[0071] The following describes the characteristic configurations extracted from each of the embodiments described above. [Configuration 1] In a power supply system (100) comprising a storage battery (21), an inverter (12), and a motor (11) connected to the storage battery via the inverter, and connectable to a single-phase charger (42), A positive-side power supply path (H1) is provided between the positive terminal of the battery and the high-potential-side terminal of the inverter, A negative-side power supply path (L1) is provided between the negative terminal of the battery and the low-potential-side terminal of the inverter, The system comprises a rectifier member (15, 115) configured by connecting a first rectifier (D1, Dp, Dp1) and a second rectifier (D2, Dn, Dn1) in series, which allows current to flow from the negative side power supply path to the positive side power supply path, while restricting current to flow from the positive side power supply path to the negative side power supply path. A power supply system having two connection terminals, the first of which is electrically connectable to the neutral point of the armature winding of the motor, and the second of which is electrically connectable between the first rectifier and the second rectifier. [Configuration 2] The system includes a power control device (50) that controls the inverter, The power supply system according to configuration 1, wherein the power supply control device controls the inverter to convert the alternating current input from the single-phase charger into a direct current, which is then input to the storage battery for charging. [Configuration 3] A first switch (SMRH) is provided in the positive electrode power supply path, A second switch (SMRL) is provided in the negative electrode power supply path, An isolated voltage conversion circuit (22) in which the input and output sections are electrically isolated, The housing (23) houses the battery, the first switch, the second switch, and the voltage conversion circuit, The first end of the first switch is connected to the high-potential electrical path of the input section, and the second end of the first switch is connected to the high-potential electrical path of the output section. The first end of the second switch is connected to the low-potential electrical path of the input section, and the second end of the second switch is connected to the low-potential electrical path of the output section. The power supply system according to configuration 2, wherein the power control device controls the inverter to convert the AC current from the single-phase charger to DC current when the first switch and the second switch are off and the single-phase charger is connected, and controls the voltage conversion circuit to convert the voltage of the DC current converted by the inverter to charge the storage battery. [Structure 4] The power supply system according to any one of configurations 1 to 3, wherein the first rectifier and the second rectifier are each composed of a semiconductor switch and a diode connected in antiparallel to the semiconductor switch. [Composition 5] A field winding (301) is positioned opposite the armature winding, The system includes a field winding circuit (302) provided between the positive electrode power supply path and the negative electrode power supply path, which controls the direction of the field current flowing through the field winding, The power supply system according to any one of configurations 1 to 4, wherein the second connection terminal of the single-phase charger is electrically connectable to the rectifier member included in the field winding circuit. [Composition 6] A first switch (SMRH) is provided in the positive electrode power supply path, A second switch (SMRL) is provided in the negative electrode power supply path, On the inverter side of the first and second switches, a voltage conversion circuit (222) connected to the positive-side power supply path and the negative-side power supply path, An auxiliary battery (121) connected to the positive-side power supply path and the negative-side power supply path via the voltage conversion circuit, The system includes a power control device (50) that controls the inverter and the voltage conversion circuit, The power supply control device is When the first and second switches are turned off and the single-phase charger is connected, the inverter is controlled to convert the AC current from the single-phase charger into DC current, and the voltage conversion circuit is controlled to convert the voltage of the DC current converted by the inverter to charge the auxiliary battery, A power supply system according to any one of configurations 1 to 5, in which, when the single-phase charger is not connected and the first switch and the second switch are turned on, the voltage conversion circuit is controlled to convert the voltage output from the auxiliary battery and input it to the battery for charging. [Composition 7] In a power control program implemented by a power control device (50) of a power supply system (100) that is connectable to a single-phase charger, the power control device (50) of the power supply system (100) comprises a storage battery (21), an inverter (12), and a motor (11) connected to the storage battery via the inverter, The aforementioned power supply system is A positive-side power supply path (H1) is provided between the positive terminal of the battery and the high-potential-side terminal of the inverter, A negative-side power supply path (L1) is provided between the negative terminal of the battery and the low-potential-side terminal of the inverter, The system comprises a rectifier member (15) configured by connecting a first rectifier and a second rectifier in series, which allows current to flow from the negative electrode power supply path to the positive electrode power supply path, Of the two connection terminals of the single-phase charger, the first connection terminal is electrically connectable to the neutral point of the armature winding of the motor, and the second connection terminal is electrically connectable between the first rectifier and the second rectifier. A power control program that causes the power control device to perform a process to control the inverter so as to convert the alternating current input from the single-phase charger into a direct current. [Structure 8] The aforementioned power supply system is A first switch (SMRH) is provided in the positive electrode power supply path, A second switch (SMRL) is provided in the negative electrode power supply path, On the inverter side of the first and second switches, a voltage conversion circuit (222) connected to the positive-side power supply path and the negative-side power supply path, (121) comprises an auxiliary battery connected to the positive side power supply path and the negative side power supply path via the voltage conversion circuit, The aforementioned power supply control device, When the first and second switches are turned off and the single-phase charger is connected, the first process controls the inverter to convert the AC current from the single-phase charger into DC current, and controls the voltage conversion circuit to convert the voltage of the DC current converted by the inverter to charge the auxiliary battery. A power control program according to configuration 7, which performs a second process to control the voltage conversion circuit to convert the voltage output from the auxiliary battery and input it to the battery for charging when the single-phase charger is not connected and the first switch and the second switch are turned on. [Explanation of symbols]

[0072] 10...Drive unit, 11...Motor, 12...Inverter, 13...Smoothing capacitor, 15...Rectifier component, 20...Battery pack, 21...Storage battery, 22, 222...DC-DC converter (voltage conversion circuit), 23...Housing, 50...Control device (power control device), 100, 200...Power system, 121...Auxiliary storage battery (auxiliary storage battery), SMRH...Positive side main switch (first switch), SMRL...Negative side main switch (second switch), H1...Positive side power supply path, L1...Negative side power supply path.

Claims

1. In a power supply system (100) comprising a storage battery (21), an inverter (12), and a motor (11) connected to the storage battery via the inverter, which can be connected to a single-phase charger (42), A positive-side power supply path (H1) is provided between the positive terminal of the battery and the high-potential-side terminal of the inverter, A negative-side power supply path (L1) is provided between the negative terminal of the battery and the low-potential-side terminal of the inverter, The system comprises a first rectifier (D1, Dp, Dp1) and a second rectifier (D2, Dn, Dn1) connected in series, and a rectifier member (15, 115) that allows current to flow from the negative side power supply path to the positive side power supply path, while restricting current to flow from the positive side power supply path to the negative side power supply path. A power supply system having two connection terminals, the first of which is electrically connectable to the neutral point of the armature winding of the motor, and the second connection terminal being electrically connectable between the first rectifier and the second rectifier.

2. The system includes a power control device (50) that controls the inverter, The power supply system according to claim 1, wherein the power supply control device controls the inverter to convert the alternating current input from the single-phase charger into a direct current and input it to charge the storage battery.

3. A first switch (SMRH) is provided in the positive electrode power supply path, A second switch (SMRL) is provided in the negative electrode power supply path, An isolated voltage conversion circuit (22) in which the input and output sections are electrically isolated, The housing (23) houses the battery, the first switch, the second switch, and the voltage conversion circuit, The first end of the first switch is connected to the high-potential electrical path of the input section, and the second end of the first switch is connected to the high-potential electrical path of the output section. The first end of the second switch is connected to the low-potential electrical path of the input section, and the second end of the second switch is connected to the low-potential electrical path of the output section. The power supply system according to claim 2, wherein the power supply control device controls the inverter to convert the AC current from the single-phase charger to a DC current when the first switch and the second switch are turned off and the single-phase charger is connected, and controls the voltage conversion circuit to convert the voltage of the DC current converted by the inverter to charge the storage battery.

4. The power supply system according to any one of claims 1 to 3, wherein the first rectifier and the second rectifier each consist of a semiconductor switch and a diode connected in antiparallel to the semiconductor switch.

5. A field winding (301) is positioned opposite the armature winding, The system includes a field winding circuit (302) provided between the positive electrode power supply path and the negative electrode power supply path, which controls the direction of the field current flowing through the field winding, The power supply system according to any one of claims 1 to 3, wherein the second connection terminal of the single-phase charger is electrically connectable to the rectifier member included in the field winding circuit.

6. A first switch (SMRH) is provided in the positive electrode power supply path, A second switch (SMRL) is provided in the negative electrode power supply path, A voltage conversion circuit (222) connected to the positive-side power supply path and the negative-side power supply path is located on the inverter side of the first switch and the second switch, An auxiliary battery (121) connected to the positive-side power supply path and the negative-side power supply path via the voltage conversion circuit, The system includes a power control device (50) that controls the inverter and the voltage conversion circuit, The power supply control device is When the first and second switches are turned off and the single-phase charger is connected, the inverter is controlled to convert the AC current from the single-phase charger into DC current, and the voltage conversion circuit is controlled to convert the voltage of the DC current converted by the inverter to charge the auxiliary battery, The power supply system according to claim 1, in the case where the single-phase charger is not connected and the first switch and the second switch are turned on, the voltage conversion circuit is controlled to convert the voltage output from the auxiliary battery and input it to the battery for charging.

7. In a power control program implemented by a power control device (50) of a power supply system (100) that is connectable to a single-phase charger, comprising a storage battery (21), an inverter (12), and a motor (11) connected to the storage battery via the inverter, The aforementioned power supply system is A positive-side power supply path (H1) is provided between the positive terminal of the battery and the high-potential-side terminal of the inverter, A negative-side power supply path (L1) is provided between the negative terminal of the battery and the low-potential-side terminal of the inverter, The system comprises a rectifier member (15) configured by connecting a first rectifier and a second rectifier in series, which allows current to flow from the negative-side power supply path to the positive-side power supply path, Of the two connection terminals of the single-phase charger, the first connection terminal is electrically connectable to the neutral point of the armature winding of the motor, and the second connection terminal is electrically connectable between the first rectifier and the second rectifier. A power control program that causes the power control device to perform a process to control the inverter so as to convert the alternating current input from the single-phase charger into a direct current.

8. The aforementioned power supply system is A first switch (SMRH) is provided in the positive electrode power supply path, A second switch (SMRL) is provided in the negative electrode power supply path, A voltage conversion circuit (222) connected to the positive-side power supply path and the negative-side power supply path is located on the inverter side of the first switch and the second switch, (121) includes an auxiliary battery connected to the positive side power supply path and the negative side power supply path via the voltage conversion circuit, The aforementioned power supply control device, When the first and second switches are turned off and the single-phase charger is connected, the first process controls the inverter to convert the AC current from the single-phase charger into DC current, and controls the voltage conversion circuit to convert the voltage of the DC current converted by the inverter to charge the auxiliary battery. The power control program according to claim 7, which, when the single-phase charger is not connected and the first switch and the second switch are turned on, performs a second process of controlling the voltage conversion circuit to convert the voltage output from the auxiliary battery and input it to the battery for charging.

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