Power supply system

Abstract

The invention provides a power supply system. A power supply system (10) is provided with: a plurality of output circuits (46, 56) electrically connected to a plurality of second coils (48C, 58C) on the second side of a transformer unit (39); and a selection circuit (38) to which power is supplied from the plurality of output circuits (46, 56). Each of the plurality of output circuits (46, 56) is electrically connected to each of the plurality of second coils (48C, 58C) on the second side, and outputs DC power to the selection circuit (38) on the basis of AC power of the second coils (48C, 58C) on the second side. A selection circuit (38) selects an object to which power is to be supplied from among the first conductive path (21) and the second conductive path (22).

Description

[0001] This application is a divisional application of the patent application with application number 202180008749.9, filed on January 25, 2021, and with the title “Power supply system”. TECHNICAL FIELD

[0002] The present disclosure relates to a power supply system. BACKGROUND

[0003] A high-voltage storage battery as a power source for driving an electric motor for vehicle running and a low-voltage storage battery as a power source for driving an auxiliary machine such as a wiper, a headlamp, and the like are mounted on an electric vehicle such as a plug-in hybrid vehicle or an electric vehicle. Note that, in the following description, the plug-in hybrid vehicle is also referred to as a PHEV (Plug-in Hybrid Electric Vehicle). The electric vehicle is also referred to as an EV (Electric Vehicle). The above-described PHEV and EV also have a vehicle-mounted charger for making it possible to supply power from a commercial power source or a quick-charging station and the like. Patent Literature 1 discloses an example of such a power supply system mounted on an electric vehicle. The power supply system disclosed in Patent Literature 1 has a plug-in charger 73 that receives power supply from an external power source EP, and is capable of supplying power to a main battery MB corresponding to a high-voltage storage battery via the plug-in charger 73. Further, a DC / DC converter is provided separately from the plug-in charger 73 between the main battery MB and an auxiliary machine battery AB corresponding to a low-voltage storage battery.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2014-212643 SUMMARY

[0007] SUMMARY OF THE INVENTION

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] In the power supply system disclosed in Patent Literature 1, there is only a single system for supplying power to an auxiliary machine load 30 corresponding to a low-voltage load, and multiple power supply paths to the low-voltage load are not ensured. Therefore, there is a concern about redundancy in this power supply system.

[0010] The present disclosure provides a structure of a power supply system that can improve the redundancy of power supply to a load while being more compact.

[0011] SOLUTION TO PROBLEM

[0012] A power supply system according to one embodiment of the present disclosure is used for a vehicle-mounted system, and includes: a first conductive path that serves as a path for supplying electric power to a first load; a second conductive path that serves as a path for supplying electric power to a second load; and an electric storage unit, wherein

[0013] The power supply system includes:

[0014] an inverter unit that includes one or more inverter circuits that convert direct-current electric power based on electric power supplied from a power source different from the electric storage unit into alternating-current electric power and supply the alternating-current electric power;

[0015] a transformer unit that includes one or more first coils and a plurality of second coils to which the alternating-current electric power is supplied from the inverter unit;

[0016] a converter circuit that is electrically connected to a first-side second coil of the plurality of second coils, converts the alternating-current electric power of the first-side second coil into direct-current electric power, and supplies the direct-current electric power to the electric storage unit side;

[0017] a plurality of output circuits that are electrically connected to a plurality of second-side second coils of the plurality of second coils different from the first-side second coil; and

[0018] a selection circuit that is supplied with electric power from the plurality of output circuits,

[0019] each of the plurality of output circuits is electrically connected to each of the plurality of second-side second coils, and outputs direct-current electric power based on the alternating-current electric power of the second-side second coil,

[0020] the selection circuit selects a supply destination of electric power from among the first conductive path and the second conductive path.

[0021] Effects of Invention

[0022] The power supply system according to one embodiment of the present disclosure can be implemented in a smaller size and can improve the redundancy of electric power supply to loads. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a block diagram that schematically illustrates a vehicle-mounted system including a power supply system according to a first embodiment of the present disclosure.

[0024] Figure 2 is a schematic view of a vehicle that mounts a vehicle-mounted system according to Figure 1 .

[0025] Figure 3 is a circuit diagram that illustrates a specific structure of an electric power supply unit in a power supply system according to Figure 1 .

[0026] Figure 4is an explanatory diagram conceptually showing a part of a vehicle-mounted system that is enlarged from the power supply system of the second embodiment of the present disclosure. Figure 1

[0027] Figure 5 is an explanatory diagram conceptually showing a part of a vehicle-mounted system that is enlarged from the power supply system of the second embodiment of the present disclosure.

[0028] Figure 6 is an explanatory diagram conceptually showing a part of a vehicle-mounted system that is enlarged from the power supply system of the second embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] Hereinafter, the embodiments of the present disclosure are exemplified. Note that the features of the following exemplified (1) to (11) can be arbitrarily combined within a range not causing contradiction.

[0030] (1) A power supply system for a vehicle-mounted system, the power supply system including: a first conductive path that is a path for supplying electric power to a first load; a second conductive path that is a path for supplying electric power to a second load; and an electric storage unit, wherein the power supply system includes: an inverter unit including one or more inverter circuits that supply electric power converted from direct current electric power based on electric power supplied from a power supply different from the electric storage unit; a transformer unit including one or more first coils and a plurality of second coils to which the inverter unit supplies alternating current electric power; a converter circuit electrically connected to a first side second coil of the plurality of second coils, which converts alternating current electric power of the first side second coil into direct current electric power to supply to the electric storage unit side; a plurality of output circuits electrically connected to a plurality of second side second coils of the plurality of second coils different from the first side second coil; and a selection circuit supplied with electric power from the plurality of output circuits, each output circuit of the plurality of output circuits being electrically connected to each coil of the plurality of second side second coils, which outputs direct current electric power based on alternating current electric power of the second side second coil, the selection circuit selecting a supply destination of electric power from the first conductive path and the second conductive path.

[0031] In the power supply system of the above (1), the plurality of output circuits supply electric power to the selection circuit, and the selection circuit is capable of selecting a supply destination of electric power from the first conductive path and the second conductive path. That is, the above power supply system is capable of switching between an operation for individually maintaining supply of electric power to the first load and an operation for individually maintaining supply of electric power to the second load. Thus, the above power supply system is capable of improving redundancy of supply of electric power to the loads. Furthermore, the above power supply system is capable of sharing a part of components used for charging the electric storage unit and a part of components used for supplying electric power to the first load and the second load, and thus is capable of realizing a structure capable of improving redundancy more compactly.

[0032] ​〔2〕 The power supply system according to 〔1〕, wherein each of the plurality of output circuits is a rectification circuit that rectifies alternating-current power supplied from the second coil on the second side.

[0033] The power supply system according to 〔2〕 can be made more compact because each of the plurality of output circuits is constituted by a rectification circuit.

[0034] 〔3〕 The power supply system according to 〔1〕 or 〔2〕, wherein the power supply system has a selection control section that controls selection operation of the selection circuit, and in a case where a first condition is satisfied, the selection control section controls the selection circuit to a state in which power supply to the second conductive path is cut off and power supply to the first conductive path is permitted, and in a case where a second condition is satisfied, the selection control section controls the selection circuit to a state in which power supply to the first conductive path is cut off and power supply to the second conductive path is permitted.

[0035] The power supply system according to 〔3〕 can selectively supply power to only the first conductive path among the first conductive path and the second conductive path in a case where the first condition is satisfied. Also, the power supply system can selectively supply power to only the second conductive path among the first conductive path and the second conductive path in a case where the second condition is satisfied.

[0036] 〔4〕 The power supply system according to 〔3〕, wherein the power supply system has a first abnormality detection section that detects an abnormality on the first conductive path side, and a second abnormality detection section that detects an abnormality on the second conductive path side, and in a case where the second abnormality detection section detects an abnormality on the second conductive path side, the selection control section controls the selection circuit to a state in which power supply to the second conductive path is cut off and power supply to the first conductive path is permitted, and in a case where the first abnormality detection section detects an abnormality on the first conductive path side, the selection control section controls the selection circuit to a state in which power supply to the first conductive path is cut off and power supply to the second conductive path is permitted.

[0037] The power supply system of the above item (4) is capable of selectively supplying electric power only to the first conductive path and the first conductive path among the first and second conductive paths when an abnormality occurs in the second conductive path side. Thus, the power supply system is capable of suppressing the influence of the abnormality from spreading to the first conductive path side and maintaining the supply of electric power to the first load when an abnormality occurs in the second conductive path side. Further, the power supply system is capable of selectively supplying electric power only to the second conductive path and the second conductive path among the first and second conductive paths when an abnormality occurs in the first conductive path side. Thus, the power supply system is capable of suppressing the influence of the abnormality from spreading to the second conductive path side and maintaining the supply of electric power to the second load when an abnormality occurs in the first conductive path side.

[0038] (5) The power supply system according to any one of items (1) to (4), wherein the inverter section has a plurality of the inverter circuits, the transformer section has a plurality of transformers each having the first coil and the second coil on the second side, each of the inverter circuits is electrically connected to the first coil of each of the transformers, and each of the first coils is supplied with alternating-current electric power, and each of the second coils on the second side of the transformers is electrically connected to each of the output circuits, and each of the output circuits is supplied with alternating-current electric power.

[0039] The power supply system of the above item (5) is capable of maintaining the supply of electric power to the first conductive path side or the second conductive path side using the inverter circuit, the transformer, and the output circuit of the path in which no abnormality occurs when an abnormality occurs in any of the inverter circuit, the transformer, and the output circuit. Thus, the power supply system of the above item is capable of further improving the redundancy of the supply of electric power to the first conductive path or the second conductive path.

[0040] (6) The power supply system according to item (5), wherein the power supply system has a plurality of the converter circuits, and each of the plurality of transformers has the second coil on the first side, each of the second coils on the first side is electrically connected to each of the converter circuits, and each of the converter circuits is supplied with alternating-current electric power.

[0041] The power supply system of the above item (6) is capable of maintaining the supply of electric power to the electric storage section side using the inverter circuit, the transformer, and the converter circuit of the path in which no abnormality occurs when an abnormality occurs in any of the inverter circuit, the transformer, and the converter circuit. Thus, the power supply system of the above item is capable of further improving the redundancy of the supply of electric power to the electric storage section side.

[0042] 〔7〕 The power supply system according to 〔6〕, wherein the power supply system is provided with a plurality of power supply circuits including the inverter circuit, the transformer, the converter circuit, and the output circuit, and further comprises an abnormal circuit detection section that detects the power supply circuit that has become in an abnormal state when any of the plurality of power supply circuits has become in the abnormal state, and a stop control section that stops the operation of the power supply circuit that has become in the abnormal state.

[0043] The power supply system of the above 〔7〕 is provided with a plurality of power supply circuits, and thus can ensure a plurality of charging paths to the power storage section and a plurality of power supply paths to the first load and the second load. Further, the power supply system can stop the power supply circuit that has become in an abnormal state to achieve protection. Moreover, the power supply system can cause the other power supply circuits to operate even when any of the power supply circuits is stopped, and thus can perform charging of the power storage section and power supply to the first load or the second load.

[0044] 〔8〕 The power supply system according to any one of 〔1〕 to 〔7〕, wherein the power supply system comprises a selection control section that controls the selection operation of the selection circuit, and an output abnormality detection section that detects the output circuit in which an output abnormality has occurred when any of the plurality of output circuits has generated the output abnormality, and the selection control section controls the selection circuit in such a manner that the output circuit in which the output abnormality has occurred is electrically disconnected from the first conductive path and the second conductive path, and the output circuit in which the output abnormality has not occurred is allowed to be electrically connected to at least any of the first conductive path and the second conductive path.

[0045] The power supply system of the above 〔8〕 can electrically disconnect the output circuit in which the output abnormality has occurred from the first conductive path and the second conductive path when any of the plurality of output circuits has generated the output abnormality, and thus can achieve protection. On the other hand, the power supply system can allow the output circuit in which the output abnormality has not occurred to be electrically connected to at least any of the first conductive path and the second conductive path, and thus can maintain the power supply to the conductive path of at least any of them.

[0046] 〔9〕 The power supply system according to any one of 〔1〕 to 〔8〕, wherein the selection circuit is provided with a first relay between each of the output circuits and the first conductive path, and switches the circuit that supplies power to the first conductive path by switching the on-off state of the plurality of first relays, and is provided with a second relay between each of the output circuits and the second conductive path, and switches the circuit that supplies power to the second conductive path by switching the on-off state of the plurality of second relays.

[0047] In the power supply system described in the above item (9), the structure in which the operation of individually maintaining the electric power supply to the first load and the operation of individually maintaining the electric power supply to the second load are separately maintained can be easily realized by the first relay and the second relay as main parts.

[0048] (10) The power supply system according to any one of (1) to (9), wherein the first conductive path is a conductive path to which a first storage battery is electrically connected, and the second conductive path is a conductive path to which a second storage battery is electrically connected.

[0049] The power supply system described in the above item (10) can be favorably used in a vehicle-mounted system that supplies electric power to a first storage battery and a first load via a first conductive path and supplies electric power to a second storage battery and a second load via a second conductive path.

[0050] (11) A vehicle including the power supply system described in any one of (1) to (10).

[0051] In the vehicle described in the above item (11), the power supply system that can improve the redundancy of the electric power supply to the load can be more compactly realized.

[0052] <First Embodiment>

[0053] Figure 1 A power supply system 10 of a first embodiment of the present disclosure is shown. The power supply system 10 constitutes a power supply system for a vehicle.

[0054] (Structure of Power Supply System)

[0055] As shown in FIG. 1, the power supply system 10 is used as a part of a vehicle-mounted system 2 mounted on a vehicle 1. The vehicle 1 is a vehicle on which the power supply system 10 is mounted, and is, for example, a PHEV, an EV, or the like. As shown in FIG. 1, the vehicle-mounted system 2 includes the power supply system 10, a high-voltage load 4, a first load 5, a second load 6, and the like. The vehicle 1 has a connection terminal not shown, to which an external alternating-current power supply 190 (not shown) can be electrically connected. Figure 2 Figure 2 As shown in FIG. 1, the power supply system 10 is used as a part of a vehicle-mounted system 2 mounted on a vehicle 1. The vehicle 1 is a vehicle on which the power supply system 10 is mounted, and is, for example, a PHEV, an EV, or the like. As shown in FIG. 1, the vehicle-mounted system 2 includes the power supply system 10, a high-voltage load 4, a first load 5, a second load 6, and the like. The vehicle 1 has a connection terminal not shown, to which an external alternating-current power supply 190 (not shown) can be electrically connected. Figure 1 Figure 1 As shown in FIG. 1, the power supply system 10 is used as a part of a vehicle-mounted system 2 mounted on a vehicle 1. The vehicle 1 is a vehicle on which the power supply system 10 is mounted, and is, for example, a PHEV, an EV, or the like. As shown in FIG. 1, the vehicle-mounted system 2 includes the power supply system 10, a high-voltage load 4, a first load 5, a second load 6, and the like. The vehicle 1 has a connection terminal not shown, to which an external alternating-current power supply 190 (not shown) can be electrically connected.

[0056] As shown in FIG. 1, the power supply system 10 is used as a part of a vehicle-mounted system 2 mounted on a vehicle 1. The vehicle 1 is a vehicle on which the power supply system 10 is mounted, and is, for example, a PHEV, an EV, or the like. As shown in FIG. 1, the vehicle-mounted system 2 includes the power supply system 10, a high-voltage load 4, a first load 5, a second load 6, and the like. The vehicle 1 has a connection terminal not shown, to which an external alternating-current power supply 190 (not shown) can be electrically connected. Figure 1 As shown in FIG. 1, the power supply system 10 is used as a part of a vehicle-mounted system 2 mounted on a vehicle 1. The vehicle 1 is a vehicle on which the power supply system 10 is mounted, and is, for example, a PHEV, an EV, or the like. As shown in FIG. 1, the vehicle-mounted system 2 includes the power supply system 10, a high-voltage load 4, a first load 5, a second load 6, and the like. The vehicle 1 has a connection terminal not shown, to which an external alternating-current power supply 190 (not shown) can be electrically connected.

[0057] ​​The power supply system 10 is a system in which the high-voltage storage battery 11, the first low-voltage storage battery 12A, and the second low-voltage storage battery 12B can be charged based on alternating-current electric power supplied from the external alternating-current power supply 190 when the vehicle 1 is connected to the external alternating-current power supply 190. Also, the power supply system 10 is a system in which electric power can be supplied to the high-voltage load 4, the first load 5, and the second load 6 when the vehicle is running.

[0058] The high-voltage load 4 is a load that can operate by receiving supply of electric power from the high-voltage storage battery 11. The high-voltage load 4 includes, for example, the drive section 8 Figure 2 ) and a PCU (Power Control Unit) that is not shown. The PCU is a device that converts output electric power of the high-voltage storage battery 11 into electric power for driving the drive section 8 and supplies the electric power to the drive section 8. The PCU has, for example, an inverter that generates alternating current (for example, three-phase alternating current) from direct current and supplies the alternating current to the drive section 8. The drive section 8 is an electrically driven device such as a main engine motor. The drive section 8 is a device that imparts driving force that rotates a wheel of the vehicle 1 based on electric power supplied from the high-voltage storage battery 11.

[0059] The first load 5 is a load that receives supply of electric power from the first electrically conductive path 21. The second load 6 is a load that receives supply of electric power from the second electrically conductive path 22. The first auxiliary machine load 5A corresponds to an example of the first load 5. The second auxiliary machine load 6A corresponds to an example of the second load 6. The first auxiliary machine load 5A and the second auxiliary machine load 6A are, for example, auxiliary equipment that is required for the engine and the motor to operate. The auxiliary equipment is, for example, a unit motor, an alternator, a radiator cooling fan, and the like. The first auxiliary machine load 5A and the second auxiliary machine load 6A can also include an electric power steering system, an electric parking brake, illumination, a wiper drive section, a navigation device, and the like. The second auxiliary machine load 6A is a load that can perform part or all of the functions of the first auxiliary machine load 5A in a case where the functions of the first auxiliary machine load 5A are stopped. The first auxiliary machine load 5A is a load that can perform part or all of the functions of the second auxiliary machine load 6A in a case where the functions of the second auxiliary machine load 6A are stopped.

[0060] The first autonomous driving load 5B is equivalent to an example of the first load 5. The second autonomous driving load 6B is equivalent to an example of the second load 6. The first autonomous driving load 5B and the second autonomous driving load 6B are loads required for autonomous driving. The first autonomous driving load 5B and the second autonomous driving load 6B include, for example, sensing systems such as millimeter-wave radars or stereo cameras, speed control systems, vehicle control systems, steering control systems, lane departure prevention assistance systems, etc. The second autonomous driving load 6B is a load that can perform part or all of the functions of the first autonomous driving load 5B when the functions of the first autonomous driving load 5B are stopped. The first autonomous driving load 5B is a load that can perform part or all of the functions of the second autonomous driving load 6B when the functions of the second autonomous driving load 6B are stopped. It should be noted that in Figure 1 In the figure, a distinction is made between the first autonomous driving load 5B and the first auxiliary machine load 5A, but this distinction does not have to be made. For example, the first auxiliary machine load 5A may contain loads belonging to the first autonomous driving load 5B, and the first autonomous driving load 5B may contain loads belonging to the first auxiliary machine load 5A. Similarly, the distinction between the second autonomous driving load 6B and the second auxiliary machine load 6A does not have to be made. For example, the second auxiliary machine load 6A may contain loads belonging to the second autonomous driving load 6B, and the second autonomous driving load 6B may contain loads belonging to the second auxiliary machine load 6A.

[0061] In this specification, the term "vehicle driving" includes, but is not limited to, a state in which the vehicle is moving. This term also includes a state in which the vehicle is moving with the accelerator depressed. This term also includes a state in which the vehicle is stationary and not moving, while power is being supplied to any or all of the first load 5 and the second load 6. If the vehicle 1 is a PHEV, this term also includes a state in which the engine is idling.

[0062] The high-voltage battery 11 is equivalent to an example of a power storage unit. The high-voltage battery 11 is configured to be chargeable and dischargeable. The high-voltage battery 11 outputs a high voltage (for example, approximately 300V) for driving the drive unit 8. The output voltage of the high-voltage battery 11 when fully charged is higher than the output voltage of the first low-voltage battery 12A when fully charged, and is also higher than the output voltage of the second low-voltage battery 12B when fully charged. The high-voltage battery 11 can be composed of a lithium-ion battery or other types of batteries. The positive pole of the high-voltage battery 11 is electrically connected to the conductive path 14A, and the negative pole of the high-voltage battery 11 is electrically connected to the conductive path 14B.

[0063] The first conductive path 21 is a path for supplying power to the first load 5. The first conductive path 21 is electrically connected to the first auxiliary load 5A, the first autonomous driving load 5B, and the first low-voltage battery 12A. The first conductive path 21 includes a conductive path 21A electrically connected to the positive terminal of the first low-voltage battery 12A and a conductive path 21B electrically connected to the negative terminal of the first low-voltage battery 12A.

[0064] The first low-voltage battery 12A is an example of a first battery. The first low-voltage battery 12A is configured to be chargeable and dischargeable. The first low-voltage battery 12A applies an output voltage between the conductive paths 21A and 21B of the first conductive path 21, supplying power to the first auxiliary load 5A and the first autonomous driving load 5B. The first low-voltage battery 12A can be a lead-acid battery or another type of battery. When fully charged, the first low-voltage battery 12A applies a predetermined voltage (e.g., 12V) to the first conductive path 21.

[0065] The second conductive path 22 is a path for supplying power to the second load 6. The second conductive path 22 is electrically connected to the second auxiliary load 6A, the second autonomous driving load 6B, and the second low-voltage battery 12B. The second conductive path 22 includes a conductive path 22A electrically connected to the positive terminal of the second low-voltage battery 12B and a conductive path 22B electrically connected to the negative terminal of the second low-voltage battery 12B.

[0066] The second low-voltage battery 12B is an example of a second battery. The second low-voltage battery 12B is configured to be chargeable and dischargeable. The second low-voltage battery 12B applies an output voltage between the conductive paths 22A and 22B of the second conductive path 22, supplying power to the second auxiliary load 6A and the second autonomous driving load 6B. The second low-voltage battery 12B can be composed of a lead-acid battery or other types of batteries. When fully charged, the second low-voltage battery 12B applies a predetermined voltage (e.g., 12V) to the second conductive path 22.

[0067] The control unit 18 is a device that performs various controls on the devices in the vehicle-mounted system 2 . The control unit 18 may be composed of a plurality of electronic control devices or a single electronic control device. The control unit 18 is a device that can control the power supply unit 30 .

[0068] If the vehicle equipped with the power supply system 10 is an EV, Figure 1 、 Figure 2 If the vehicle equipped with the power supply system 10 is a PHEV, the vehicle has an engine in addition to the drive unit 8. Therefore, if the vehicle is a PHEV, the engine and the drive unit 8 work together to enable the PHEV to travel.

[0069] The power supply section 30 mainly includes a PFC (Power Factor Correction) converter 32, power supply circuits 34, 36, a selection circuit 38, noise filter sections 91, 92, 94, 96, and the like. The noise filter sections 91, 92, 94, 96 are portions that remove noise of a path. Note that the power supply circuits 34, 36 can also be provided with three or more power supply circuits of the same structure. Hereinafter, the structure in which the power supply circuits 34, 36 are provided as two will be described as a representative example.

[0070] The power supply section 30 constitutes a charging device for vehicle use. The power supply section 30 functions as an OBC (On Board Charger). The power supply section 30 is capable of performing an operation of charging the high-voltage storage battery 11 that functions as a main power supply, based on power supplied from an external AC power source 190 (for example, a commercial power source) that is connected to the vehicle 1, in a case where the external AC power source 190 is connected to the vehicle 1. The power supply section 30 also performs an operation of charging the low-voltage storage battery 12 based on power supplied from the external AC power source 190, in a case where the external AC power source 190 is connected to the vehicle 1. Figure 3 A specific circuit of the power supply section 30 will be described.

[0071] The PFC converter 32 functions as a power factor improvement circuit and constitutes an AC / DC converter that performs power conversion between AC power and DC power. The PFC converter includes inductors 32A, 32B, switching elements 32C, 32D, 32E, 32F that constitute a full-bridge circuit. Two input terminals of the full-bridge circuit constituted by the switching elements 32C, 32D, 32E, 32F are electrically connected to the inductors 32A, 32B, respectively. Two output terminals of the full-bridge circuit are electrically connected to both ends of a capacitor 32H. The PFC converter 32 generates a DC voltage from an AC voltage input to terminals 32M, 32N from the external AC power source 190 at the time of external charging, and applies the DC voltage to both ends of the capacitor 32H. The PFC converter 32 applies a DC voltage to terminals 42M, 42N of the inverter circuit 42 and a pair of input terminals not shown in the inverter circuit 52, in accordance with the application of the DC voltage to both ends of the capacitor 32H.

[0072] The inverter section 37 includes a plurality of inverter circuits 42, 52 that supply AC power converted from DC power based on power supplied from a power source different from the high-voltage storage battery 11 (for example, the external AC power source 190).

[0073] The inverter circuit 42, 52 functions as a DC / AC inverter, and functions as a power conversion circuit that converts the direct-current electric power input from the PFC converter 32 into alternating-current electric power and outputs the same. The inverter circuit 42 includes switching elements 42C, 42D, 42E, 42F that constitute a full-bridge circuit. One of two output terminals of the full-bridge circuit constituted by the switching elements 42C, 42D, 42E, 42F is electrically connected to one of the first end portions 48M (both ends of the coil 48A) of the first transformer 48. The other of the two output terminals is electrically connected to the other of the first end portions 48M. The inverter circuit 42 converts the direct-current voltage input from the PFC converter 32 into an alternating-current voltage, and outputs the alternating-current voltage to the first end portions 48M of the transformer 48.

[0074] The inverter circuit 52 has the same structure as the inverter circuit 42. The inverter circuit 52 converts the direct-current voltage input from the PFC converter 32 to the pair of input terminals of the inverter circuit 52 into an alternating-current voltage, and outputs the alternating-current voltage to the first end portions 58M of the transformer 58.

[0075] The transformer section 39 has a plurality of transformers 48, 58. The transformer section 39 is provided with a plurality of first coils 48A, 58A to which alternating-current electric power is supplied from the inverter section 37, and a plurality of second coils 48B, 48C, 58B, 58C. The plurality of first coils 48A, 58A can function as primary-side coils. In the case where the plurality of first coils 48A, 58A function as primary-side coils, the plurality of second coils 48B, 48C, 58B, 58C can function as secondary-side coils.

[0076] The transformer 48 is provided with the first coil 48A, and a plurality of second coils 48B, 48C. The inverter circuit 42 is electrically connected to the first coil 48A of the transformer 48, and supplies alternating-current electric power to the first coil 48A. The second coil 48B of the transformer 48 corresponds to an example of the second coil on the first side. The second coil 48B is electrically connected to the converter circuit 44, and supplies alternating-current electric power to the converter circuit 44. The second coil 48C of the transformer 48 corresponds to an example of the second coil on the second side. The second coil 48C is electrically connected to the output circuit 46, and supplies alternating-current electric power to the output circuit 46.

[0077] The transformer 58 has a first coil 58A, and a plurality of second coils 58B, 58C. The inverter circuit 52 is electrically connected to the first coil 58A of the transformer 58, and supplies alternating-current power to the first coil 58A. The second coil 58B of the transformer 58 corresponds to an example of the second coil on the first side. The second coil 58B is electrically connected to the converter circuit 54, and supplies alternating-current power to the converter circuit 54. The second coil 58C of the transformer 58 corresponds to an example of the second coil on the second side. The second coil 58C is electrically connected to the output circuit 56, and supplies alternating-current power to the output circuit 56.

[0078] The converter circuits 44, 54 function as bidirectional AC / DC converters, and have a function of bidirectionally converting alternating-current power and direct-current power. The converter circuit 44 is capable of performing a first operation in a manner of converting alternating-current power supplied to the second coil 48B into direct-current power to supply to the high-voltage storage battery 11 (storage section) side, in a case where the alternating-current power is supplied to the second coil 48B. The converter circuit 44 performs the above first operation in a manner of converting an output voltage (alternating-current voltage) applied to the second end portion 48N (both ends of the coil 48B) of the transformer 48 into a direct-current voltage, and applying the direct-current voltage to the terminals 44M, 44N. The terminal 44M is an electrically conductive path capable of being electrically connected to the positive electrode of the high-voltage storage battery 11, and the terminal 44N is an electrically conductive path capable of being electrically connected to the negative electrode of the high-voltage storage battery 11. Note that a relay and a fuse, which are not shown, can be interposed between the terminals 44M, 44N and the high-voltage storage battery 11. The converter circuit 44 is capable of performing a second operation in a manner of converting direct-current power supplied from the high-voltage storage battery 11 (storage section) to the terminals 44M, 44N into alternating-current power to supply to the second coil 48 of the transformer 48, in a case where the direct-current power is supplied to the terminals 44M, 44N. The converter circuit 44 performs the above second operation in a manner of converting a direct-current voltage applied to the terminals 44M, 44N into an alternating-current voltage, and applying the alternating-current voltage to both ends of the second end portion 48N. The converter circuit 44 includes the switching elements 42C, 42D, 42E, 42F, and the capacitor 44H, which constitute a full-bridge circuit. One of a pair of terminals of the full-bridge circuit constituted by the switching elements 42C, 42D, 42E, 42F is electrically connected to one of the second end portion 48N (one end of the second coil 48B). The other of the above pair of terminals is electrically connected to the other of the second end portion 48N (the other end of the second coil 48B). Figure 1

[0079] ​The converter circuit 54 is of the same structure as the converter circuit 44. The converter circuit 54 is electrically connected to the second coil 58B. The second coil 58B corresponds to an example of the second coil of the first side. The converter circuit 54 functions as a bidirectional AC / DC converter, and has a function of bidirectionally converting AC power and DC power. The converter circuit 54, in a case where the first coil 58A functions as a primary-side coil and supplies AC power to the second coil 58B, can perform a first operation in a manner of converting the AC power supplied to the second coil 58B into DC power and supplying the DC power to the high-voltage battery 11 (storage section) side. The converter circuit 54 performs the above first operation in a manner of converting an output voltage (AC voltage) applied to the second end portion 58N of the transformer 58 into a DC voltage applied between the conductive paths 60A, 60B. The conductive path 60A is a conductive path that can be conducted with the conductive path 14A. The conductive path 60B is a conductive path that can be conducted with the conductive path 14B. The converter circuit 54, in a case where DC power is supplied from the high-voltage battery 11, can perform a second operation in a manner of converting the DC power into AC power and supplying the AC power to the second coil 58B of the transformer 58. The converter circuit 54 performs the above second operation in a manner of converting a DC voltage applied between the conductive paths 60A, 60B based on the power supply from the high-voltage battery 11 into an AC voltage and applying the AC voltage to both ends of the second end portion 58N (both ends of the second coil 58B).

[0080] The output circuits 46, 56 constitute rectifier circuits. The output circuit 46 is electrically connected to the second coil 48C (second coil of the second side) different from the second coil 48B (second coil of the first side) among the plurality of second coils 48B, 48C. The plurality of output circuits 46, 56 are respectively electrically connected to the respective second coils 48C, 58C (plurality of second coils of the second side), and output DC power based on AC power of the second coils 48C, 58C.

[0081] The output circuit 46 is electrically connected to the second coil 48C, and operates in a manner of outputting DC power based on AC power of the second coil 48C. Specifically, the output circuit 46 rectifies and smooths an AC voltage input from the second coil 48C, and applies a DC voltage between the terminals 46M, 46N. In Figure 3In the example of the output circuit 46, the output circuit 46 is configured as a center-tapped full-wave rectifier circuit including diodes 46A, 46B, an inductor 46C, and a capacitor 46D. The second coil 48C connected to the input side of the output circuit 46 is a center-tapped coil. One of a pair of output terminals 46M, 46N of the output circuit 46 can be electrically connected to the conductive path 38X of the selection circuit 38. The other of the pair of output terminals 46M, 46N can be electrically connected to the conductive path 38Z of the selection circuit 38. An output voltage from the output circuit 46 is applied between the conductive paths 38X, 38Z of the selection circuit 38.

[0082] The output circuit 56 is configured similarly to the output circuit 46. The output circuit 56 is electrically connected to the second coil 58C (second-side second coil) different from the second coil 58B (first-side second coil) among the plurality of second coils 58B, 58C. The output circuit 56 is electrically connected to the second coil 58C to operate in a manner of outputting a direct-current power based on an alternating-current power of the second coil 58C. Specifically, the output circuit 56 rectifies and smooths an alternating-current voltage input from the second coil 58C to apply a direct-current voltage between the conductive paths 61A, 61B. A high-potential side terminal of a pair of output terminals of the output circuit 56 can be electrically connected to the conductive path 38Y of the selection circuit 38 via the conductive path 61A. A low-potential side terminal of the pair of output terminals of the output circuit 46 can be electrically connected to the conductive path 38Z of the selection circuit 38 via the conductive path 61B. An output voltage from the output circuit 56 is applied between the conductive paths 38Y, 38Z of the selection circuit 38.

[0083] As Figure 4 The selection circuit 38 is a circuit to which electric power is supplied from the plurality of output circuits 46, 56. The selection circuit 38 selects an object to which electric power is supplied from among the first conductive path 21 and the second conductive path 22. The selection circuit 38 includes the conductive paths 38X, 38Y, 38Z as input paths. The selection circuit 38 includes relays 38A, 38B, 38C.

[0084] The relay 38A is interposed between the conductive path 38X and the conductive path 21A to switch between the conductive path 38X and the conductive path 21A between an on state and an off state. When the relay 38A is in the on state, a current can flow between the conductive path 38X and the conductive path 21A. When the relay 38A is in the off state, no current flows between the conductive path 38X and the conductive path 21A.

[0085] The relay 38C is interposed between the conductive path 38Y and the conductive path 22A, and switches between the conductive path 38Y and the conductive path 22A between the on state and the off state. When the relay 38C is in the on state, current can flow between the conductive path 38Y and the conductive path 22A. When the relay 38C is in the off state, no current flows between the conductive path 38Y and the conductive path 22A.

[0086] The relay 38B is interposed between the conductive path 21A and the conductive path 22A, and switches between the conductive path 21A and the conductive path 22A between the on state and the off state. When the relay 38B is in the on state, current can flow between the conductive path 21A and the conductive path 22A. When the relay 38B is in the off state, no current flows between the conductive path 21A and the conductive path 22A. When the relay 38A is in the on state and the relay 38B is in the on state, current can flow from the conductive path 38X to the conductive path 22A. When the relay 38C is in the on state and the relay 38B is in the on state, current can flow from the conductive path 38Y to the conductive path 21A.

[0087] The relays 38A, 38B, 38C correspond to an example of the first relays respectively arranged between the output circuits 46, 56 and the first conductive path 21. The selection circuit 38 switches the circuit that supplies electric power to the first conductive path 21 by switching the on-off state of the relays 38A, 38B, 38C (the plurality of first relays). Specifically, the selection circuit 38 sets the output circuit 46 as the "circuit that supplies electric power to the first conductive path 21" when the relay 38A is in the on state, and sets the output circuit 46 as the "circuit that does not supply electric power to the first conductive path 21" when the relay 38A is in the off state. Also, the selection circuit 38 sets the output circuit 56 as the "circuit that supplies electric power to the first conductive path 21" when the relays 38B, 38C are in the on state, and sets the output circuit 56 as the "circuit that does not supply electric power to the first conductive path 21" when any of the relays 38B, 38C is in the off state. The relays 38A, 38B, 38C correspond to an example of the second relays respectively arranged between the output circuits 46, 56 and the second conductive path 22. The selection circuit 38 switches the circuit that supplies electric power to the second conductive path 22 by switching the on-off state of the relays 38A, 38B, 38C (the plurality of second relays). Specifically, the selection circuit 38 sets the output circuit 56 as the "circuit that supplies electric power to the second conductive path 22" when the relay 38C is in the on state, and sets the output circuit 56 as the "circuit that does not supply electric power to the second conductive path 22" when the relay 38C is in the off state. Also, the selection circuit 38 sets the output circuit 46 as the "circuit that supplies electric power to the second conductive path 22" when the relays 38A, 38B are in the on state, and sets the output circuit 46 as the "circuit that does not supply electric power to the second conductive path 22" when any of the relays 38A, 38B is in the off state.

[0088] Figure 1The control section 18 shown corresponds to an example of a first abnormality detection section that detects an abnormality on the first conductive path 21 side. Further, the control section 18 corresponds to an example of a second abnormality detection section that detects an abnormality on the second conductive path 22 side. The control section 18 can also adopt a determination method that determines that there is an abnormality on the first conductive path 21 side when the current flowing in the first conductive path 21 at the time of vehicle running becomes an overcurrent state that is equal to or greater than a first threshold value. Alternatively, the control section 18 can also adopt a determination method that determines that there is an abnormality on the first conductive path 21 side when the current flowing in the first conductive path 21 at the time of vehicle running becomes a low current state that is less than a second threshold value. Alternatively, the control section 18 can also adopt a determination method that determines that there is an abnormality on the first conductive path 21 side when the voltage of the first conductive path 21 at the time of vehicle running becomes a low voltage state that is less than a threshold voltage. In this case, the threshold voltage described above is a value that is greater than 0 V and lower than the output voltage at the time of full charge of the first low-voltage battery 12A, and is a value that is lower than the output voltage at the time of full charge of the second low-voltage battery 12B.

[0089] The control section 18 can also adopt a determination method that determines that there is an abnormality on the second conductive path 22 side when the current flowing in the second conductive path 22 at the time of vehicle running becomes an overcurrent state that is equal to or greater than a second threshold value. Alternatively, the control section 18 can also adopt a determination method that determines that there is an abnormality on the second conductive path 22 side when the current flowing in the second conductive path 22 at the time of vehicle running becomes a low current state that is less than the second threshold value. The control section 18 can also adopt a determination method that determines that there is an abnormality on the second conductive path 22 side when the voltage of the second conductive path 22 at the time of vehicle running becomes a low voltage state that is less than a threshold voltage. In this case, the threshold voltage described above is a value that is greater than 0 V and lower than the output voltage at the time of full charge of the second low-voltage battery 12B, and is a value that is lower than the output voltage at the time of full charge of the second low-voltage battery 12B.

[0090] Figure 1The control section 18 shown functions as an abnormality circuit detection section, an output abnormality detection section, and can detect respective abnormalities of the plurality of power supply circuits 34, 36 (for example, respective output abnormalities of the plurality of output circuits 46, 56). The control section 18 can also adopt a determination method that determines the power supply circuit 34 as abnormal when an overcurrent state in which a current of the threshold value or more is generated at a prescribed portion of the power supply circuit 34. Alternatively, the control section 18 can also adopt a determination method that determines the power supply circuit 34 as abnormal when an overvoltage state in which a voltage of the first threshold value or more is reached at a prescribed portion of the power supply circuit 34. Alternatively, the control section 18 can also adopt a determination method that determines the power supply circuit 34 as abnormal when a low voltage state in which a voltage of the second threshold value or less is reached at a prescribed portion of the power supply circuit 34. Alternatively, the control section 18 can also adopt a determination method that determines the power supply circuit 34 as abnormal (for example, determines an output abnormality of the output circuit 46) when any one of the power, voltage, and current output from the output circuit 46 in operation of the power supply circuit 34 is the prescribed value or less with the relay 38A in the on state. Likewise, the control section 18 can also adopt a determination method that determines the power supply circuit 36 as abnormal when an overcurrent state in which a current of the threshold value or more is generated at a prescribed portion of the power supply circuit 36. Alternatively, the control section 18 can also adopt a determination method that determines the power supply circuit 36 as abnormal when an overvoltage state in which a voltage of the first threshold value or more is reached at a prescribed portion of the power supply circuit 36. Alternatively, the control section 18 can also adopt a determination method that determines the power supply circuit 36 as abnormal when a low voltage state in which a voltage of the second threshold value or less is reached at a prescribed portion of the power supply circuit 36. Alternatively, the control section 18 can also adopt a determination method that determines the power supply circuit 36 as abnormal (for example, determines an output abnormality of the output circuit 56) when any one of the power, voltage, and current output from the output circuit 56 in operation of the power supply circuit 36 is the prescribed value or less with the relay 38C in the on state.

[0091] (Action at the time of external charging)

[0092] The following is a description of the action of the power supply system 10 at the time of external charging. At the time of external charging, the power supply system 10 can be electrically connected to an external alternating-current power source 190 that is a power source outside the vehicle via a cable or the like, which is omitted from the drawing. When the external alternating-current power source 190 is connected to the vehicle 1 Figure 2 ) and the external alternating-current power source 190 is electrically connected to the power supply system 10, electric power is supplied from the first low-voltage battery 12A and the second low-voltage battery 12B to the control section 18. The detection of the electrical connection of the external alternating-current power source 190 to the power supply system 10 and the control of the supply of electric power to the control section 18 are performed by a control device, not shown, that is different from the control section 18.

[0093] When the supply of electric power from the first low-voltage battery 12A and the second low-voltage battery 12B to the control section 18 is started in accordance with the connection of the external AC power source 190, the control section 18 causes the electric power supply section 30 to operate. Specifically, the control section 18 causes the PFC converter 32, the electric power supply circuit 34, 36 to operate in a manner that converts the AC voltage from the external AC power source 190 into a high-voltage DC voltage to be supplied to the high-voltage battery 11. When the electric power supply section 30 thus operates, the high-voltage battery 11 is charged. Note that, as long as the voltage ratio of the first end portion 48M to the second end portion 48N is appropriately set in the transformer 48 and the voltage ratio of the first end portion 58M to the second end portion 58N is appropriately set in the transformer 58, the electric power supply section 30 can supply an appropriate charging voltage to the high-voltage battery 11.

[0094] On the other hand, the control section 18 causes the relays 38A, 38B, 38C to be all turned on in advance when the electric power supply section 30 is caused to operate as described above at the time of external charging. Then, the AC voltage from the external AC power source 190 is converted into a low-voltage DC voltage and output from the output circuits 46, 56, and the DC voltage output from the output circuits 46, 56 is supplied to the first low-voltage battery 12A and the second low-voltage battery 12B. Thus, the first low-voltage battery 12A and the second low-voltage battery 12B are charged. As long as the voltage ratio of the first coil 48A to the second coil 48C is appropriately set in the transformer 48 and the voltage ratio of the first coil 58A to the second coil 58C is appropriately set in the transformer 58, an appropriate charging voltage can be supplied to the first low-voltage battery 12A and the second low-voltage battery 12B.

[0095] (Action at the time of normal state when the vehicle is running)

[0096] The following description is a description of the action at the time of normal state when the vehicle is running. The normal state when the vehicle is running referred to herein is a state in which neither the first abnormality detection section nor the second abnormality detection section detects any abnormality of the first conductive path 21 and the second conductive path 22, and the abnormality circuit detection section does not detect any abnormality of the electric power supply circuit 34, 36, when the vehicle is running. In the following description, the normal state when the vehicle is running is referred to as the normal state. Figure 2 In the vehicle 1 shown in FIG. 1, when the ignition switch key or the wireless key or the like is operated and the vehicle 1 becomes a start state in accordance with the key operation, the supply of electric power from the first low-voltage battery 12A and the second low-voltage battery 12B to the control section 18 is started. The detection of the operation of the ignition switch key or the wireless key or the like and the start of the supply of electric power to the control section 18 or the like are performed by a control device, not shown, which is different from the control section 18.

[0097] When the vehicle is running, the control unit 18 operates the above-mentioned PCU (not shown). At this time, the high-voltage DC power supplied from the high-voltage battery 11 is supplied to the above-mentioned PCU, which converts the high-voltage DC power into AC power and supplies it to the drive unit 8 ( Figure 2 ) is supplied. By supplying AC power from the PCU to the drive unit 8 in this manner, the drive unit 8 starts to operate. Furthermore, the control unit 18 controls the operation of the drive unit 8 by controlling the PCU.

[0098] On the other hand, when power begins to be supplied from the first and second low-voltage batteries 12A and 12B to the control unit 18 in response to the aforementioned key operation, the control unit 18 turns on all relays 38A, 38B, and 38C of the selection circuit 38. Furthermore, while the vehicle is traveling, the power supply unit 30 operates, whereby the high-voltage DC power supplied from the high-voltage battery 11 to the converter circuit 44 is converted into low-voltage DC power by the converter circuit 44, transformer 48, and output circuit 46, and then output from the output circuit 46. Specifically, the converter circuit 44 performs the aforementioned second operation by converting the DC voltage applied to terminals 44M and 44N into an AC voltage and applying this AC voltage between the ends of the second coil 48B (between the ends of the second end 48N). In response to the application of the AC voltage between the ends of the second coil 48B, the AC voltage is supplied between the ends of the second coil 48C. Furthermore, when an AC voltage is supplied to second coil 48C, output circuit 46 rectifies and smoothes the AC voltage input from second coil 48C, applying a DC voltage between terminals 46M and 46N. Similarly, high-voltage DC power supplied from high-voltage battery 11 to converter circuit 54 is converted to low-voltage DC power by converter circuit 54, transformer 58, and output circuit 56, and then output from output circuit 56. Furthermore, the output circuit applies a DC voltage between conductive paths 61A and 61B.

[0099] The control unit 18 may also operate both converter circuits 44 and 54 constantly to output DC power from both output circuits 46 and 56 when the operating condition is met while the vehicle is traveling and in a normal state, and may stop the output of power from both output circuits 46 and 56 when the stop condition is met. Alternatively, the control unit 18 may operate only one of the converter circuits 44 and 54 when a first operating condition is met, and operate both converter circuits 44 and 54 when a second operating condition is met while the vehicle is traveling and in a normal state. In this case, the control unit 18 may stop the output of power from all output circuits 46 and 56 when the stop condition is met.

[0100] (Operation in the event of an abnormality while the vehicle is driving)

[0101] As described above, the control portion 18 causes the power supply portion 30 to operate to output a direct current voltage from the output circuits 46, 56 to the first conductive path 21 and the second conductive path 22 based on the electric power from the high voltage storage battery 11 when the vehicle is running and in a normal state. On the other hand, the control portion 18 monitors abnormality of the first conductive path 21 side and the second conductive path 22 side by any of the above-described determination methods when the vehicle is running. Further, the control portion 18 monitors abnormality of the power supply circuits 34, 36 by any of the above-described determination methods when the vehicle is running.

[0102] The control portion 18 causes the relays 38A, 38B to be in an open state and the relay 38C to be in a closed state when it is determined by any of the above-described determination methods that the first conductive path 21 side is abnormal when the vehicle is running. By this operation, the conduction between the output circuits 46, 56 and the first conductive path 21 is cut off, and the conduction between the second conductive path 22 and the first conductive path 21 is also cut off. Therefore, the first conductive path 21 is electrically separated, and the electric power from the output circuit 56 can be selectively supplied to the second conductive path 22.

[0103] The control portion 18 causes the relays 38B, 38C to be in an open state and the relay 38A to be in a closed state when it is determined by any of the above-described determination methods that the second conductive path 22 side is abnormal when the vehicle is running. By this operation, the conduction between the output circuits 46, 56 and the second conductive path 22 is cut off, and the conduction between the first conductive path 21 and the second conductive path 22 is also cut off. Therefore, the second conductive path 22 is electrically separated, and the electric power from the output circuit 46 can be selectively supplied to the first conductive path 21.

[0104] The control portion 18 causes the relays 38A, 38B to be in an open state and the relay 38C to be in a closed state when it is determined by any of the above-described determination methods that the power supply circuit 34 is abnormal when the vehicle is running. By this operation, the conduction between the output circuit 46 and the first conductive path 21 and the second conductive path 22 is cut off, and the conduction between the second conductive path 22 and the first conductive path 21 is also cut off. Therefore, the electric power from the output circuit 56 can be selectively supplied to the second conductive path 22.

[0105] The control portion 18 can always or under prescribed conditions cause the relay 38A to be in an open state and the relays 38B, 38C to be in a closed state when it is determined that the power supply circuit 34 is abnormal. By this operation, the conduction between the output circuit 46 and the first conductive path 21 and the second conductive path 22 is cut off, and the electric power from the output circuit 56 can be supplied to both the first conductive path 21 and the second conductive path 22.

[0106] The control portion 18 can perform control to make the relay 38A in the off state and the relays 38B and 38C in the on state when the first supply condition is satisfied, in the case where it is determined that the power supply circuit 34 is abnormal. Also, the control portion 18 can perform control to make the relays 38A and 38B in the off state and the relay 38C in the on state when the second supply condition is satisfied, in the case where it is determined that the power supply circuit 34 is abnormal.

[0107] The control portion 18 makes the relays 38B and 38C in the off state and the relay 38A in the on state when it is determined that the power supply circuit 36 is abnormal by any of the above-described determination methods while the vehicle is running. By this action, the conduction between the output circuit 56 and the first conductive path 21 and the second conductive path 22 is cut off, and the conduction between the first conductive path 21 and the second conductive path 22 is also cut off. Therefore, it is possible to selectively supply power from the output circuit 46 to the first conductive path 21.

[0108] The control portion 18 can always or under prescribed conditions make the relay 38C in the off state and the relays 38A and 38B in the on state when it is determined that the power supply circuit 36 is abnormal. By this action, the conduction between the output circuit 56 and the first conductive path 21 and the second conductive path 22 is cut off, and it is possible to supply power from the output circuit 46 to both the first conductive path 21 and the second conductive path 22.

[0109] The control portion 18 can perform control to make the relays 38B and 38C in the off state and the relay 38A in the on state when the third supply condition is satisfied, in the case where it is determined that the power supply circuit 36 is abnormal. Also, the control portion 18 can perform control to make the relay 38C in the off state and the relays 38A and 38B in the on state when the fourth supply condition is satisfied, in the case where it is determined that the power supply circuit 36 is abnormal.

[0110] In this example, the control section 18 functions as an example of a selection control section, and controls the selection operation of the selection circuit 38. The control section 18 controls the selection circuit 38 to a state in which the power supply to the second conductive path 22 is cut off and the power supply to the first conductive path 21 is allowed in the case where the first condition is satisfied. Also, the control section 18 controls the selection circuit 38 to a state in which the power supply to the first conductive path 21 is cut off and the power supply to the second conductive path 22 is allowed in the case where the second condition is satisfied. Specifically, in the case where the second abnormality detection section detects an abnormality on the second conductive path 22 side, the control section 18 (selection control section) controls the selection circuit 38 to a state in which the power supply to the second conductive path 22 is cut off and the power supply to the first conductive path 21 is allowed. Also, in the case where the first abnormality detection section detects an abnormality on the first conductive path 21 side, the control section 18 controls the selection circuit 38 to a state in which the power supply to the first conductive path 21 is cut off and the power supply to the second conductive path 22 is allowed.

[0111] Further, the control section 18 controls the selection circuit 38 in such a manner that the conduction between the power supply circuit determined to be abnormal and at least either of the first conductive path 21 and the second conductive path 22 is cut off in the case where it is determined by any of the above-described determination methods that any of the power supply circuits 34, 36 is abnormal. Also, the control section 18 controls the selection circuit 38 in such a manner that the conduction between the power supply circuit not determined to be abnormal and at least either of the first conductive path 21 and the second conductive path 22 is allowed. For example, the control section 18 controls the selection circuit 38 in such a manner that the conduction between the output circuit determined to have generated an output abnormality and at least either of the first conductive path 21 and the second conductive path 22 is cut off in the case where it is determined that any of the output circuits 46, 56 has generated an output abnormality. Also, the control section 18 controls the selection circuit 38 in such a manner that the conduction between the output circuit not determined to have generated an output abnormality and at least either of the first conductive path 21 and the second conductive path 22 is allowed.

[0112] Further, the control section 18 functions as an example of a stop control section. The control section 18 stops the operation of the power supply circuit that has become in an abnormal state in the case where it is determined by any of the above-described determination methods that any of the plurality of power supply circuits 34, 36 is abnormal (i.e., in the case where any of the plurality of power supply circuits 34, 36 has become in an abnormal state). For example, the control section 18 stops the operation of the power supply circuit including the output circuit that has generated an output abnormality in the case where it is determined that any of the plurality of output circuits 46, 56 has generated an output abnormality.

[0113] Further, a fuse or a relay can be provided between the terminals 46M, 46N of the output circuit 46 and the selection circuit 38, and the fuse or the relay is cut off when overcurrent occurs between the output circuit 46 and the selection circuit 38, so that the structure for protection is realized. Similarly, a fuse or a relay can be provided between the output circuit 56 and the selection circuit 38, and the fuse or the relay is cut off when overcurrent occurs between the output circuit 56 and the selection circuit 38, so that the structure for protection is realized.

[0114] The following description relates to an example of effects of the present disclosure.

[0115] In the power supply system 10 described above, the selection circuit 38 can select a supply object of power output from the plurality of output circuits (rectifier circuits) 46, 56 from among the first conductive path 21 and the second conductive path 22. That is, the power supply system 10 can switch between an operation for individually maintaining the supply of power to the first load 5 and an operation for individually maintaining the supply of power to the second load 6. Thus, the power supply system 10 can improve the redundancy of the supply of power to the loads. Further, the power supply system 10 can share a part of components used for charging the high-voltage storage battery 11 (storage section) and a part of components used for supplying power to the first load 5 and the second load 6, and thus can realize a structure capable of improving the redundancy more compactly.

[0116] The power supply system 10 can realize a structure capable of sharing a part of components and performing charging of the high-voltage storage battery 11 (storage section) and the supply of power to the first load 5 and the second load 6 more compactly because the plurality of output circuits 46, 56 are each configured by a rectifier circuit.

[0117] The power supply system 10 can perform an operation for selectively supplying power only to the first conductive path 21 among the first conductive path 21 and the second conductive path 22 when the first condition is satisfied. Further, the power supply system 10 can perform an operation for selectively supplying power only to the second conductive path 22 among the first conductive path 21 and the second conductive path 22 when the second condition is satisfied. That is, the power supply system 10 can perform control in such a manner that the output object of power from the selection circuit 38 is switched according to the conditions.

[0118] The power supply system 10 is capable of selectively supplying electric power to only the first electric conductive path 21 and the first electric conductive path 21 of the second electric conductive path 22 in the event of an abnormality on the second electric conductive path 22 side. Thus, the power supply system 10 is capable of suppressing the influence of the abnormality from spreading to the first electric conductive path 21 side and maintaining the electric power supply to the first load 5 in the event of an abnormality on the second electric conductive path 22 side. Further, the power supply system 10 is capable of selectively supplying electric power to only the first electric conductive path 21 and the second electric conductive path 22 of the second electric conductive path 22 in the event of an abnormality on the first electric conductive path 21 side. Thus, the power supply system 10 is capable of suppressing the influence of the abnormality from spreading to the second electric conductive path 22 side and maintaining the electric power supply to the second load 6 in the event of an abnormality on the first electric conductive path 21 side.

[0119] In the event of an abnormality in any of the inverter circuits, transformers, output circuits, and the like of the power supply system 10, the inverter circuits, transformers, output circuits, and the like of the path in which no abnormality has occurred are capable of maintaining the electric power supply to the first electric conductive path side or the second electric conductive path side. Thus, the power supply system 10 is capable of further improving the redundancy of the electric power supply to the first electric conductive path or the second electric conductive path.

[0120] In the event of an abnormality in any of the inverter circuits, transformers, converter circuits, and the like of any of the plurality of electric power supply circuits 34, 36 of the power supply system 10, the circuits of the path in which no abnormality has occurred are capable of maintaining the electric power supply to the high-voltage storage battery 11 side. Thus, the power supply system 10 is capable of further improving the redundancy of the electric power supply to the high-voltage storage battery 11 side.

[0121] In the event of any of the electric power supply circuits 34, 36 of the power supply system 10 becoming an abnormal state, the power supply system 10 is capable of achieving protection by stopping the electric power supply circuit. Further, the power supply system 10 is capable of causing the other electric power supply circuit to operate even if the electric power supply circuit of any of them is stopped, and is capable of performing the charging of the high-voltage storage battery 11, the electric power supply to the first load 5 or the second load 6.

[0122] In the event of any of the plurality of output circuits 46, 56 of the power supply system 10 generating an output abnormality, the power supply system 10 is capable of achieving protection by electrically disconnecting the output circuit in which the output abnormality has occurred from the first electric conductive path 21 and the second electric conductive path 22. On the other hand, the power supply system 10 is capable of allowing the energization between the output circuit in which no output abnormality has occurred and at least any of the first electric conductive path 21 and the second electric conductive path 22, and is capable of maintaining the electric power supply to the electric conductive path of at least any of them.

[0123] In the power supply system 10, the structure in which the switching separately maintains the operation of the electric power supply to the first load 5 and the operation of the electric power supply to the second load 6 is capable of being easily achieved mainly by the first relay and the second relay.

[0124] <Second Embodiment>

[0125] The following description relates to the power supply system 210 of the second embodiment. The points of addition of the power supply circuit 236 identical to the power supply circuit 36 and the change of the selection circuit 38 to the selection circuit 238 are structural differences when compared with the power supply system 10. The power supply system 210 is identical to the power supply system 10 with respect to other points. Figure 1 Figure 5 The in-vehicle system 202 of the second embodiment is a system in which the power supply system 10 is changed to the power supply system 210 in the in-vehicle system 2.

[0126] The power supply circuit 236 becomes the same structure as the power supply circuit 36 and functions identically to the power supply circuit 36. In the power supply circuit 236, an inverter circuit identical to the inverter circuit 52 electrically connects a pair of input terminals to both ends of the capacitor 32H in the power supply circuit 36. Figure 3 In the power supply circuit 236, a converter circuit identical to the converter circuit 54 electrically connects a pair of output terminals to the conductive paths 14A, 14B. In the power supply circuit 236, the output circuit 256 becomes the same structure as the output circuit 56 and electrically connects a pair of output terminals to the conductive path 238W and the conductive path 238Z of the selection circuit 238. Note that a structure in which a fuse or a relay is provided between the output circuit 256 and the selection circuit 238 and protection is realized in such a manner that the fuse or the relay is cut when an overcurrent occurs between the output circuit 256 and the selection circuit 238 can also be employed.

[0127] The selection circuit 238 is a circuit to which power is supplied from the plurality of output circuits 46, 56, 256 and from which power is selected from the first conductive path 21 and the second conductive path 22. The selection circuit 238 is provided with relays 238A, 238B, 238C, 238D, 238E, 238F. The selection circuit 238 is provided with the conductive paths 238W, 238X, 238Y, 238Z as input paths.

[0128] The power supply system 210 causes the power supply circuit 236 to also function identically to the power supply circuit 36 at the time of operation of the power supply circuit 36 at the time of external charging. Also, the power supply system 210 causes the relays 238A, 238B, 238C, 238D, 238E, 238F of the selection circuit 238 to all be in the on state at the time of external charging. Except for these points, the "operation at the time of external charging" of the power supply system 210 is identical to that of the power supply system 10 of the first embodiment.

[0129] ​The power supply system 210 causes the power supply circuit 236 to operate in the same manner as the power supply circuit 36 when the power supply circuit 36 operates in the normal state while the vehicle is running. Also, the power supply system 210 causes the relays 238A, 238B, 238C, 238D, 238E, 238F of the selection circuit 238 to be in the on state in the normal state while the vehicle is running. Other than these points, the operation of the power supply system 210 in the normal state while the vehicle is running is the same as that of the power supply system 10 of the first embodiment. Note that the power supply system 210 can not cause the relay 238F to be in the on state in the normal state.

[0130] The power supply system 210 monitors the abnormality of the first conductive path 21 side and the second conductive path 22 side by any of the above-described determination methods while the vehicle is running. Also, the power supply system 210 monitors the abnormality of the power supply circuits 34, 36, 236 by any of the above-described determination methods while the vehicle is running. The abnormality determination method of the power supply circuit 236 is the same as that of the power supply circuits 34, 36.

[0131] The control unit 18 causes the relays 238A, 238D, 238F to be in the off state and the relays 238B, 238C, 238E to be in the on state when it is determined that the first conductive path 21 side is abnormal by any of the above-described determination methods while the vehicle is running. By this operation, the conduction between the output circuits 46, 56, 256 and the first conductive path 21 is cut off, and the conduction between the second conductive path 22 and the first conductive path 21 is also cut off. Thus, the first conductive path 21 is electrically separated, and it is possible to selectively supply the power from the output circuits 56, 256 to the second conductive path 22. In this case, the control unit 18 can not cause the relays 238B, 238C, 238E to be in the on state, can cause the relay 238B to be in the on state and the relays 238C, 238E to be in the off state, or can cause the relay 238B to be in the off state and the relays 238C, 238E to be in the on state.

[0132] The control portion 18, when the vehicle is running, in a case where it is determined that the second conductive path 22 side is abnormal by any of the above-described determination methods, makes the relays 238D, 238B, 238E off and makes the relays 238A, 238C, 238F on. By this action, the conduction between the output circuits 46, 56, 256 and the second conductive path 22 is cut off, and the conduction between the second conductive path 22 and the first conductive path 21 is also cut off. Therefore, the second conductive path 22 is electrically separated, and it is possible to selectively supply electric power from the output circuits 46, 256 to the first conductive path 21. In this case, the control portion 18 can not make all of the relays 238A, 238C, 238F on, can make the relay 238A on and the relays 238C, 238F off, or can make the relay 238A off and the relays 238C, 238F on.

[0133] The control portion 18, when the vehicle is running, in a case where it is determined that the power supply circuit 34 is abnormal (for example, in a case where it is determined that an output abnormality occurs in the output circuit 46) by any of the above-described determination methods, makes the relay 238A off. In this case, the control portion 18 makes the other relays 238B, 238C, 238D, 238E, 238F on. By this action, the conduction between the output circuit 46 and the first conductive path 21 and the second conductive path 22 is cut off. Note that, in this case, the control portion 18 can not make all of the relays 238B, 238C, 238D, 238E, 238F on.

[0134] The control portion 18, when the vehicle is running, in a case where it is determined that the power supply circuit 36 is abnormal (for example, in a case where it is determined that an output abnormality occurs in the output circuit 56) by any of the above-described determination methods, makes the relay 238B off. In this case, the control portion 18 makes the other relays 238A, 238C, 238D, 238E, 238F on. By this action, the conduction between the output circuit 56 and the first conductive path 21 and the second conductive path 22 is cut off. Note that, in this case, the control portion 18 can not make all of the relays 238A, 238C, 238D, 238E, 238F on.

[0135] The control portion 18, when the vehicle is running, brings the relay 238C to the open state in a case where it is determined that the power supply circuit 236 is abnormal by any of the above-described determination methods (for example, in a case where it is determined that an output abnormality occurs in the output circuit 256). In this case, the control portion 18 brings the other relays 238A, 238B, 238D, 238E, 238F to the closed state. By this action, the conduction between the output circuit 56 and the first conductive path 21 and the second conductive path 22 is cut off. Note that, in this case, the control portion 18 can also not bring all of the relays 238A, 238B, 238D, 238E, 238F to the closed state.

[0136] <Other Embodiments>

[0137] The present disclosure is not limited to the embodiments described above and illustrated in the drawings. For example, features of the above-described or hereinafter-described embodiments can be combined in any manner without contradiction. Also, any feature of the above-described or hereinafter-described embodiments can be omitted as long as it is not explicitly stated as a necessary feature. In addition, the above-described embodiments can be changed as follows.

[0138] In the above-described embodiments, the transformer portion 39 is constituted by a plurality of transformers 48, 58, etc., but can also be constituted by a single transformer as in the power supply system 310 of Figure 6 the vehicle-mounted system 302. Figure 6 The vehicle-mounted system 302 is a system in which the power supply system 10 is changed to the power supply system 310 in the vehicle-mounted system 2. Figure 6 The structure of the vehicle-mounted system 302 Figure 1 in which the plurality of inverter circuits 42, 52 in the vehicle-mounted system 302 are commonized by the inverter circuit 42, and the converter circuit 44, 54, the output circuit 46, 56 are electrically connected to each second coil of the common transformer (transformer portion 339). Figure 6 The structure of the vehicle-mounted system 302 also performs the same action as the first embodiment and can achieve the same effects as the first embodiment.

[0139] In the above-described embodiments, the output circuits 46, 56, 256 that constitute the prescribed rectifier circuit are exemplified, but the output circuit can also be a circuit of another structure as long as it is a circuit that converts input alternating-current power into direct-current power and outputs it.

[0140] In the above-described embodiments, the power supply system 10 includes the high-voltage storage battery 11 (storage portion), but the power supply system 10 can also not include the high-voltage storage battery 11. That is, the power supply system 10 can also be a device different from the high-voltage storage battery 11.

[0141] In the above-described embodiment, the power supply system 10 includes the first low-voltage storage battery 12A and the second low-voltage storage battery 12B (low-voltage storage batteries having lower output voltages than the storage sections). However, the power supply system 10 can not include either or both of the first low-voltage storage battery 12A and the second low-voltage storage battery 12B. That is, the power supply system 10 can be a device different from either or both of the first low-voltage storage battery 12A and the second low-voltage storage battery 12B.

[0142] In the above-described embodiment, the control section 18 corresponds to an example of a selection control section, but the selection control section can be configured as a device different from the control section 18.

[0143] In the above-described embodiment, the control section 18 functions as the first abnormality detection section and the second abnormality detection section, but either or both of the first abnormality detection section and the second abnormality detection section can be configured by a device different from the control section 18.

[0144] In the above-described embodiment, an example in which the first conductive path 21 side is determined to be abnormal and an example in which the second conductive path 22 side is determined to be abnormal are described, but the examples are not limited thereto. For example, the first abnormality detection section can determine that the first conductive path 21 side is abnormal when an abnormality signal is acquired from the first load 5, a control device that controls the first load 5, or the like. Similarly, the second abnormality detection section can determine that the second conductive path 22 side is abnormal when an abnormality signal is acquired from the second load 6, a control device that controls the second load 6, or the like. Alternatively, the first abnormality detection section can determine that the first conductive path 21 side is abnormal when the SOH (States Of Health) of the first low-voltage storage battery 12A is in a deterioration state of being lower than a prescribed value. Similarly, the second abnormality detection section can determine that the second conductive path 22 side is abnormal when the SOH (States Of Health) of the second low-voltage storage battery 12B is in a deterioration state of being lower than a prescribed value.

[0145] In the above-described embodiment, the power supply system 10, 210, 310 is mounted on a vehicle such as a PHEV or an EV, but is not limited thereto. The power supply system 10, 210, 310 can be mounted on a vehicle of a kind other than the above-described (for example, a HEV (Hybrid Electric Vehicle)), or a device other than a vehicle.

[0146] Note that the embodiments disclosed this time are illustrative in all points and are not limited to them. The scope of the present application is not limited to the embodiments disclosed this time, and is intended to include all modifications within the scope of the claims or equivalent thereof.

[0147] SUMMARY

[0148] 1: vehicle

[0149] 2: in-vehicle system

[0150] 4: high-voltage load

[0151] 5: first load

[0152] 5A: first auxiliary machine-type load

[0153] 5B: first automated driving load

[0154] 6: second load

[0155] 6A: second auxiliary machine-type load

[0156] 6B: second automated driving load

[0157] 8: drive unit

[0158] 10: power supply system

[0159] 11: high-voltage storage battery (storage unit)

[0160] 12: low-voltage storage battery

[0161] 12A: first low-voltage storage battery

[0162] 12B: second low-voltage storage battery

[0163] 14A: conductive path

[0164] 14B: conductive path

[0165] 18: control unit (selection control unit, abnormal circuit detection unit, stop control unit, output abnormality detection unit)

[0166] 21: first conductive path

[0167] 21A: conductive path

[0168] 21B: conductive path

[0169] 22: second conductive path

[0170] 22A: conductive path

[0171] 22B: conductive path

[0172] 30: power supply unit

[0173] 32: PFC converter

[0174] 32A: inductor

[0175] 32B: inductor

[0176] 32C: switching element

[0177] 32D: switching element

[0178] 32E: switching element

[0179] 32F: switching element

[0180] 32H: capacitor

[0181] 32M: terminal

[0182] 32N: terminal

[0183] 34: power supply circuit

[0184] 36: power supply circuit

[0185] 37: inverter section

[0186] 38: selection circuit

[0187] 38A: relay

[0188] 38B: relay

[0189] 38C: relay

[0190] 38X: conductive path

[0191] 38Y: conductive path

[0192] 38Z: conductive path

[0193] 39: transformer section

[0194] 42: inverter circuit

[0195] 42C: switching element

[0196] 42D: switching element

[0197] 42E: switching element

[0198] 42F: switching element

[0199] 42M: terminal

[0200] 42N: terminal

[0201] 44: converter circuit

[0202] 44H: capacitor

[0203] 44M: terminal

[0204] 44N: terminal

[0205] 46: output circuit (rectifier circuit)

[0206] 46A: diode

[0207] 46B: diode

[0208] 46C: inductor

[0209] 46D: capacitor

[0210] 46M: output terminal

[0211] 46N: output terminal

[0212] 48: first transformer

[0213] 48A: first coil

[0214] 48B: second coil (second coil on first side)

[0215] 48C: second coil (second coil on second side)

[0216] 48M: first end

[0217] 48N: second end

[0218] 52: inverter circuit

[0219] 54: converter circuit

[0220] 56: output circuit (rectifier circuit)

[0221] 58: transformer

[0222] 58A: first coil

[0223] 58B: second coil (second coil on first side)

[0224] 58C: second coil (second coil on second side)

[0225] 58M: first end

[0226] 58N: second end

[0227] 60A: conductive path

[0228] 60B: conductive path

[0229] 61A: conductive path

[0230] 61B: conductive path

[0231] 91: noise filter section

[0232] 92: noise filter section

[0233] 94: noise filter section

[0234] 96: noise filter section

[0235] 190: external AC power source

[0236] 202: on-vehicle system

[0237] 210: power supply system

[0238] 236: power supply circuit

[0239] 238: selection circuit

[0240] 238A: relay

[0241] 238B: relay

[0242] 238C: relay

[0243] 238D: relay

[0244] 238E: relay

[0245] 238F: relay

[0246] 238W: conductive path

[0247] 238X: conductive path

[0248] 238Y: conductive path

[0249] 238Z: conductive path

[0250] 256: output circuit (rectifier circuit)

[0251] 310: power supply system

[0252] 339: transformer section

Claims

1. A power supply system for an in-vehicle system, comprising: a first conductive path as a path for supplying power to a first load; a second conductive path as a path for supplying power to a second load; and a power storage unit, wherein: The power supply system comprises: a converter circuit that converts direct current power based on the power supplied from the power storage unit into alternating current power and supplies the alternating current power; a transformer unit including one or more first coils and a plurality of second coils to which AC power is supplied from the converter circuit; a plurality of output circuits electrically connected to a plurality of second coils on a second side of the plurality of second coils, which are different from the second coil on the first side electrically connected to the converter circuit; and a selection circuit, which is supplied with power from the plurality of output circuits, The selection circuit selects a destination to which power is supplied from the first conductive path and the second conductive path.

2. The power supply system according to claim 1, wherein: Each of the plurality of output circuits is a rectifier circuit that rectifies the AC power supplied from the second coil on the second side.

3. The power supply system according to claim 1 or 2, wherein: The power supply system includes a selection control unit that controls the selection operation of the selection circuit. When the first condition is met, the selection control unit controls the selection circuit to cut off the power supply to the second conductive path and allow the power supply to the first conductive path. When the second condition is met, the selection control unit controls the selection circuit to cut off the power supply to the first conductive path and allow the power supply to the second conductive path.

4. The power supply system according to claim 3, wherein: The power supply system comprises: a first abnormality detecting unit configured to detect an abnormality on the first conductive path side; and a second abnormality detecting unit configured to detect an abnormality on the second conductive path side; When the second abnormality detection unit detects an abnormality on the second conductive path side, the selection control unit controls the selection circuit to cut off the power supply to the second conductive path and allow the power supply to the first conductive path. When the first abnormality detection unit detects an abnormality on the first conductive path side, the selection control unit controls the selection circuit to cut off the power supply to the first conductive path and allow the power supply to the second conductive path.

5. The power supply system according to claim 1 or 2, wherein: The transformer unit includes a plurality of transformers, each transformer including the first coil and the second coil on the second side. The second coil on the second side of each of the transformers is electrically connected to each of the output circuits to supply AC power to each of the output circuits.

6. The power supply system according to claim 5, wherein: The power supply system includes a plurality of the converter circuits. Each transformer of the plurality of transformers has a second coil on the first side, Each of the first-side second coils is electrically connected to each of the converter circuits to supply AC power to each of the converter circuits.

7. The power supply system according to claim 6, wherein: The power supply system is provided with a plurality of power supply circuits, each of which includes the transformer, the converter circuit, and the output circuit. The power supply system further comprises: an abnormal circuit detection unit that, when any one of the plurality of power supply circuits is in an abnormal state, detects the power supply circuit in the abnormal state; and The stop control unit stops the operation of the power supply circuit that has entered the abnormal state.

8. The power supply system according to claim 1 or 2, wherein: The power supply system comprises: A selection control unit controls the selection action of the selection circuit; and an output abnormality detecting unit for detecting the output circuit in which the output abnormality occurs when any one of the plurality of output circuits has an output abnormality; The selection control unit controls the selection circuit in the following manner: cuts off the power supply between the output circuit that has the output abnormality and the first conductive path and the second conductive path, and allows the power supply between the output circuit that has not the output abnormality and at least one of the first conductive path and the second conductive path.

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