Power control device and power control method

Abstract

To provide a power supply control device and a power supply control method that can improve the response performance of ground fault detection.SOLUTION: A power supply control device 1 includes a first system 11, a second system 21, a connection unit 2, and a control unit 3. The first system supplies a first load with power of a first power supply 10. The second system supplies a second load with power of a second power supply 20. The connection unit connects the first system and the second system. The control unit shuts down the connection unit when the voltage of the first power supply is equal to or less than the first threshold value. The connection unit is shut off when the voltage of the second power supply is equal to or less than a second threshold value, which is less than the first threshold value.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The disclosed embodiments relate to a power control device and a power control method.

Background Art

[0002] There is a power control device including a first system that supplies power of a first power source to a first load, a second system that supplies power of a second power source to a second load, an inter-system switch that connects the first system and the second system, and a control unit that controls the inter-system switch (see, for example, Patent Document 1).

[0003] The control unit of the power control device normally conducts the inter-system switch and supplies power from the first power source to the first system and the second system. Then, when the voltage of the first system or the second system becomes equal to or lower than the ground fault threshold value, the control unit determines that a ground fault has occurred, shuts off the inter-system switch, and performs FOP (fail operation) by the normal system in which no ground fault is detected among the first system and the second system.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when the power control device detects a ground fault based on the voltage of the second system, for example, when a ground fault occurs in the first system, the voltage of the second system drops after the first system, so the detection of the ground fault in the first system is delayed, and there is room for improvement in the response performance of the ground fault detection.

[0006] One aspect of the embodiment has been made in view of the above, and an object thereof is to provide a power control device and a power control method capable of improving the response performance of ground fault detection.

Means for Solving the Problem

[0007] A power control device according to an aspect of the embodiment includes a first system, a second system, a connection part, and a control part. The first system supplies the power of the first power source to the first load. The second system supplies the power of the second power source to the second load. The connection part connects the first system and the second system. The control part cuts off the connection part when the voltage of the first power source becomes equal to or lower than a first threshold value, and cuts off the connection part when the voltage of the second power source becomes equal to or lower than a second threshold value smaller than the first threshold value.

Advantage of the Invention

[0008] A power control device and a power control method according to an aspect of the embodiment have an effect of being able to improve the response performance of ground fault detection.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of a power control device and a power control method will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments shown below. In the following, a power control device mounted on a vehicle having an automatic driving function and supplying power to a load will be described as an example, but the power control device according to the embodiment may be mounted on a vehicle not having an automatic driving function.

[0011] The power control device according to the embodiment is mounted on an electric vehicle, a hybrid vehicle, or an engine vehicle that runs by an internal combustion engine. Note that the power control device according to the embodiment includes a first power source and a second power source, and when a power failure occurs in the first power source, the second power source may back up the first power source and perform FOP (fail operation) on any device.

[0012] [1. First Embodiment] [1.1. Configuration and Operation of Power Control Device According to First Embodiment] FIG. 1 is an explanatory diagram showing a configuration example of a power control device 1 according to the first embodiment. FIG. 2 is an explanatory diagram showing an operation example of the power control device 1 according to the first embodiment.

[0013] As shown in FIG. 1, the power control device 1 is connected to a first power source 10 and an automatic driving control device 110. Further, the power control device 1 is connected to an FOP load 101 and a general load 102, which are examples of the first load.

[0014] The first power source 10 includes, for example, a generator and a lead battery when the power control device 1 is mounted on an engine vehicle. Note that the battery of the first power source 10 may be any secondary battery other than a lead battery.

[0015] The generator is, for example, an alternator that converts the kinetic energy of a running vehicle into electricity to generate power. The generator charges the lead battery and a second power source described later with the generated power, and supplies power to the FOP load 101 and the general load 102.

[0016] When the power control device 1 is mounted on an electric vehicle or a hybrid vehicle, the first power source 10 includes a DC / DC converter and a lead battery. In this case, the DC / DC converter is connected to a generator and a high-voltage battery whose voltage is higher than that of the lead battery, steps down the voltages of the generator and the high-voltage battery, and outputs them to the power control device 1. The high-voltage battery is, for example, a battery for vehicle drive mounted on an electric vehicle or a hybrid vehicle.

[0017] The FOP load 101 includes a steering motor, an electric brake device, an in-vehicle camera, a radar, etc. that operate during automatic driving. The general load 102 includes, for example, a display, an air conditioner, an audio, a video, and various lights. The automatic driving control device 110 is a device that operates the FOP load 101 to control the automatic driving of the vehicle.

[0018] The power control device 1 includes a second power source 20. The second power source 20 includes, for example, a lithium-ion battery. Note that the battery included in the second power source 20 may be a secondary battery other than a lithium-ion battery. The second power source 20 is a backup power source when the power supply by the first power source 10 becomes unavailable.

[0019] The power control device 1 includes a first system 11 that supplies the power of the first power source 10 to the FOP load 101 and the general load 102, which are examples of the first load, and a second system 21 that supplies the power of the second power source 20 to the FOP load 101 and the general load 102, which are examples of the second load.

[0020] Furthermore, the power control device 1 includes a connection part 2, a control part 3, a battery switch 4, a first voltage sensor 51, and a second voltage sensor 52. The first voltage sensor 51 detects the voltage of the first system 11 and outputs the detection result to the control part 3. The second voltage sensor 52 detects the voltage of the second system 21 and outputs the detection result to the control part 3.

[0021] The connection part 2 connects the first system 11 and the second system 21 in a conductible and interruptible manner. The connection part 2 is, for example, an inter-system switch that connects the first system 11 and the second system 21. The conduction and interruption of the connection part 2 are switched by the control of the control part 3.

[0022] Note that the connection part 2 may be, for example, a DC / DC converter. In this case, the control part 3 operates the DC / DC converter to conduct the first system 11 and the second system 21, and interrupts the first system 11 and the second system 21 by stopping the operation of the DC / DC converter.

[0023] The battery switch 4 is a switch that connects the second power supply 20 and the second system 21 in a conductible and interruptible manner. The conduction and interruption of the battery switch 4 are switched by the control of the control part 3.

[0024] The control part 3 controls the connection part 2 and the battery switch 4. For example, during normal times when there is no power failure such as a ground fault, the control part 3 interrupts the battery switch 4 and conducts the connection part 2. Thereby, as shown in FIG. 1, the power control device 1 supplies power from the first power supply 10 to the FOP load 101 and the general load 102.

[0025] Further, when the control part 3 detects the occurrence of a ground fault in the first system 11 or the second system 21 based on the detection results of the first voltage sensor 51 and the second voltage sensor 52, the control part 3 interrupts the connection part 2 and conducts the battery switch 4.

[0026] Thereby, as shown in FIG. 2, the power control device 1 supplies power from the first power supply 10 to the FOP load 101 and the general load 102, and at the same time supplies power from the second power supply 20 to the FOP load 101 and the general load 102.

[0027] After that, the control unit 3 returns until the detection result of the first voltage sensor 51 exceeds the ground fault threshold after a predetermined time has elapsed. If the detection result of the second voltage sensor 52 is less than the ground fault threshold even after a predetermined time has elapsed, it is determined that there is a ground fault in the second system 21, and the battery switch 4 is turned off. Thereby, the power supply control device 1 can continue to supply power to the FOP load 101 by the first power supply 10.

[0028] Also, if the detection result of the first voltage sensor 51 is less than the ground fault threshold even after a predetermined time has elapsed and the detection result of the second voltage sensor 52 returns until it exceeds the ground fault threshold after a predetermined time has elapsed, it is determined that there is a ground fault in the first system 11. In this case, the power supply control device 1 can continue to supply power to the FOP load 101 by the second power supply 20.

[0029] Specifically, the control unit 3 includes a first control unit 31 and a second control unit 32. The first control unit 31 is constituted by hardware. The first control unit 31 tentatively determines the occurrence of a ground fault in the first system 11 or the second system 21 based on the detection results of the first voltage sensor 51 and the second voltage sensor 52. When the first control unit 31 tentatively determines that a ground fault has occurred, it immediately shuts off the connection unit 2 by hardware, shuts off the battery switch 4, and notifies the second control unit 32 of the occurrence of the ground fault.

[0030] The second control unit 32 is constituted by software. For example, the second control unit 32 includes a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and various circuits. Note that the second control unit 32 may be partially or entirely constituted by hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0031] When the second control unit 32 receives a notification of the occurrence of a ground fault from the first control unit 31, it takes over the control of the connection unit 2 and the battery switch 4 by the first control unit 31. That is, the second control unit 32 continues the control of disconnecting the connection unit 2 and conducting the battery switch 4.

[0032] Then, the second control unit 32 determines which of the first system 11 and the second system 21 has a ground fault by executing the program stored in the ROM by using the RAM as a work area.

[0033] When the second control unit 32 determines that there is a ground fault in the second system 21, as described above, it disconnects the battery switch 4 and causes the first power supply 10 to supply power to the FOP load 101. When the second control unit 32 determines that there is a ground fault in the first system 11, as described above, it continues to conduct the battery switch 4 and causes the second power supply 20 to supply power to the FOP load 101.

[0034] Here, when the control unit 3 detects a ground fault based on, for example, the voltage of the second system 21, when a ground fault occurs in the first system 11, the detection of the ground fault in the first system 11 is delayed because the voltage of the second system 21 drops after the first system 11. That is, the response performance of the ground fault detection by the control unit 3 deteriorates.

[0035] Therefore, the control unit 3 according to the embodiment disconnects the connection unit 2 when the voltage of the first power supply 10 becomes equal to or lower than the first threshold value, and disconnects the connection unit 2 when the voltage of the second power supply 20 becomes equal to or lower than the second threshold value which is smaller than the first threshold value.

[0036] That is, when the voltage of the first system 11 becomes equal to or lower than the first threshold value, or when the voltage of the second system 21 becomes equal to or lower than the second threshold value which is smaller than the first threshold value, the control unit 3 determines that a ground fault has occurred in the first system 11 or the second system 21, disconnects the connection unit 2, and conducts the battery switch 4.

[0037] Therefore, the control unit 3 can improve the responsiveness of the ground fault detection of the second system 21 by detecting a ground fault based on the voltage of the second system 21. In addition, the control unit 3 can improve the responsiveness of the ground fault detection of the first system 11 by detecting a ground fault by comparing the first threshold value larger than the second threshold value with the voltage of the first system 11.

[0038] Specifically, when the voltage of the first power supply 10 is equal to or lower than the first threshold value, or the voltage of the second power supply 20 is equal to or lower than the second threshold value smaller than the first threshold value, the first control unit 31 has hardware that temporarily determines that a ground fault has occurred in the first system 11 or the second system 21 and shuts off the connection unit 2. After the first control unit 31 temporarily determines that a ground fault has occurred, the second control unit 32 has software that authenticates the system in which the ground fault has occurred based on the voltage of the first system 11 and the voltage of the second system 21.

[0039] As described above, since the first control unit 31 is configured by inexpensive hardware, the responsiveness of detection can be enhanced compared to detecting a ground fault by software, and the manufacturing cost of the control unit 3 can be reduced. Next, with reference to FIG. 3, a configuration example of the first control unit 31 will be described. FIG. 3 is an explanatory diagram showing a configuration example of the first control unit 31 according to the first embodiment.

[0040] As shown in FIG. 3, the first control unit 31 includes a first comparator 33, a second comparator 34, and an OR circuit 35. In addition, the first control unit 31 has a first threshold value 36 and a second threshold value 37 smaller than the first threshold value 36 as reference voltages.

[0041] The first comparator 33 compares the voltage V1 of the first system 11 (the voltage of the first power supply 10) detected by the first voltage sensor 51 with the first threshold value 36. If the voltage V1 of the first system 11 is equal to or lower than the first threshold value 36, the first comparator 33 outputs a signal of H (high level) indicating that a ground fault has been temporarily determined to the OR circuit 35. If the voltage V1 of the first system 11 is not equal to or lower than the first threshold value 36, the first comparator 33 outputs a signal of L (low level) indicating normality to the OR circuit 35.

[0042] The second comparator 34 compares the voltage V2 of the second system 21 (voltage of the second power supply 20) detected by the second voltage sensor 52 with the second threshold value 37. If the voltage V2 of the second system 21 is less than or equal to the second threshold value 37, it outputs an H (high level) signal indicating that a ground fault is tentatively determined to the OR circuit 35. If the voltage V2 of the second system 21 is not less than or equal to the second threshold value 37, the second comparator 34 outputs an L (low level) signal indicating normal to the OR circuit 35.

[0043] When an H signal is input from the first comparator 33 or the second comparator 34, the OR circuit 35 outputs the H signal to the connection part 2, the second control part 32, and the battery switch 4. The H signal output from the OR circuit 35 to the second control part 32 is a notification that a ground fault is tentatively determined to have occurred. When an H signal is input from the OR circuit 35, the connection part 2 switches from conduction to cutoff. When an H signal is input from the OR circuit 35, the battery switch 4 switches from cutoff to conduction.

[0044] Since the first control part 31 is configured by hardware, strictly speaking, the first control part 31 does not "tentatively determine that a ground fault has occurred". For the sake of convenience, in this specification, it is assumed that a ground fault is tentatively determined when an H signal is output from the first comparator 33 or the second comparator 34.

[0045] [1.2. Processing Executed by the Control Part According to the First Embodiment] Next, with reference to FIG. 4, the processing executed by the second control part 32 will be described. FIG. 4 is a flowchart showing an example of the processing executed by the second control part 32 according to the first embodiment.

[0046] As shown in FIG. 4, the second control part 32 determines whether there is a notification of a tentative determination from the first control part 31 (step S101). If the second control part 32 determines that there is no notification of a tentative determination (step S101, No), it ends the processing and starts the processing again from step S101.

[0047] When the second control unit 32 determines that there is a notification of a preliminary determination (step S101, Yes), it continues to cut off the connection unit 2 (step S102) and continues to conduct the battery switch 4 (step S103). Thereafter, the second control unit 32 determines whether the voltage V1 of the first system 11 is equal to or less than a third threshold value (step S104). The third threshold value is, for example, a value smaller than the second threshold value 37.

[0048] When the second control unit 32 determines that the voltage V1 of the first system 11 is equal to or less than the third threshold value (step S104, Yes), it determines that there is a ground fault in the first system 11 (step S105) and ends the process. At this time, the second control unit 32 notifies the automatic driving control device 110 that a ground fault has occurred in the first system 11. Thereby, the automatic driving control device 110 operates the FOP load 101 to start the evacuation running of the vehicle.

[0049] Also, when the second control unit 32 determines that the voltage V1 of the first system 11 is not equal to or less than the third threshold value (step S104, No), it determines whether the voltage V2 of the second system 21 is equal to or less than the third threshold value (step S106). When the second control unit 32 determines that the voltage V2 of the second system 21 is equal to or less than the third threshold value (step S106, Yes), it determines that there is a ground fault in the second system 21 (step S107) and ends the process. Thus, the second control unit 32 can accurately determine the system in which the ground fault has occurred by comparing the voltage V1 of the first system 11 and the voltage V2 of the second system 21 with a third threshold value smaller than the second threshold value.

[0050] At this time, the second control unit 32 notifies the automatic driving control device 110 that a ground fault has occurred in the second system 21. Thereby, the automatic driving control device 110 operates the FOP load 101 to start the evacuation running of the vehicle. Note that the third threshold value may be the same as the second threshold value 37, but the accuracy of this determination can be improved by making the third threshold value smaller than the second threshold value 37.

[0051] Further, when the second control unit 32 determines that the voltage V2 of the second system 21 is not less than or equal to the third threshold value (step S106, No), it determines that the temporary determination of the ground fault by the first control unit 31 is a false detection due to a temporary overvoltage, noise, etc., conducts the battery switch 4 (step S108), conducts the connection part 2 (step S109), and returns to the normal operation. Thereafter, the second control unit 32 ends the process and starts the process again from step S101.

[0052] In addition, when this determination is made in step S105, it is desirable to determine a ground fault of the first system 11 when the state where the voltage V1 of the first system 11 is less than or equal to the third threshold value (step S104, Yes) continues for a predetermined time or more. Similarly, when this determination is made in step S107, it is desirable to determine a ground fault of the second system 21 when the state where the voltage V2 of the second system 21 is less than or equal to the third threshold value (step S106, Yes) continues for a predetermined time or more.

[0053] [2. Second Embodiment] [2.1. Configuration and Operation of Power Supply Control Device According to Second Embodiment] Next, with reference to FIG. 5, the configuration and operation of the power supply control device 1a according to the second embodiment will be described. FIG. 5 is an explanatory diagram showing a configuration example of the power supply control device 1a according to the second embodiment.

[0054] As shown in FIG. 5, the configuration of the control unit 3a of the power supply control device 1a is different from that of the control unit 3 of the power supply control device 1 according to the first embodiment. The control unit 3a is configured by software. For example, the control unit 3a includes a microcomputer having a CPU, ROM, RAM, etc. and various circuits.

[0055] Instead of the first control unit 31 and the second control unit 32, the control unit 3a includes a pseudo-abnormality determination unit 31a and a true-abnormality determination unit 32a that function by the CPU executing a program stored in the ROM using the RAM as a work area.

[0056] When the voltage V1 of the first power supply 10 is equal to or lower than the first threshold value 36, or when the voltage V2 of the second power supply 20 is equal to or lower than the second threshold value 37 which is smaller than the first threshold value 36, the pseudo-abnormality determination unit 31a has software that tentatively determines that a ground fault has occurred in the first system 11 or the second system 21 and cuts off the connection unit 2. That is, the pseudo-abnormality determination unit 31a performs the same control as the first control unit 31 by executing the software. Here, the first threshold value 36 and the second threshold value 37 are values stored in the non-volatile memory in advance.

[0057] In addition, after the ground fault is tentatively determined by the pseudo-abnormality determination unit 31a, the true-abnormality determination unit 32a has software that truly determines the system in which the ground fault has occurred based on the voltage of the first power supply 10 and the voltage of the second power supply 20. That is, the true-abnormality determination unit 32a performs the same control as the second control unit 32 by executing the software.

[0058] According to the control unit 3a, even if the first control unit 31 configured by hardware is not provided in the chip, the pseudo-abnormality determination unit 31a realized by software can tentatively determine the occurrence of a ground fault in the same manner as the first control unit 31. Therefore, the control unit 3a can be further miniaturized by reducing the occupied area of the hardware.

[0059] [2.2. Processing Executed by the Control Unit According to the Second Embodiment] Next, with reference to FIG. 6, the processing executed by the control unit 3a according to the second embodiment will be described. FIG. 6 is a flowchart showing an example of the processing executed by the control unit 3a according to the second embodiment.

[0060] As shown in FIG. 6, in the control unit 3a, first, the pseudo-abnormality determination unit 31a determines whether the voltage V1 of the first system 11 is equal to or lower than the first threshold value 36 (step S201).

[0061] When the temporary abnormality determination unit 31a determines that the voltage V1 of the first system 11 is less than or equal to the first threshold value 36 (step S201, Yes), the process proceeds to step S203. When the temporary abnormality determination unit 31a determines that the voltage V1 of the first system 11 is not less than or equal to the first threshold value 36 (step S201, No), it determines whether the voltage V2 of the second system 21 is less than or equal to the second threshold value 37 (step S202).

[0062] When the temporary abnormality determination unit 31a determines that the voltage V2 of the second system 21 is not less than or equal to the second threshold value 37 (step S202, No), the process ends and the process starts again from step S201. When the temporary abnormality determination unit 31a determines that the voltage V2 of the second system 21 is less than or equal to the second threshold value 37 (step S202, Yes), it disconnects the connection part 2 (step S203) and conducts the battery switch 4 (step S204).

[0063] Thereafter, the main abnormality determination unit 32a executes the same processing as steps S104 to S109 executed by the second control unit 32 shown in FIG. 4. Specifically, the main abnormality determination unit 32a determines whether the voltage V1 of the first system 11 is less than or equal to the third threshold value (step S104). The third threshold value is, for example, a value smaller than the second threshold value 37.

[0064] When the main abnormality determination unit 32a determines that the voltage V1 of the first system 11 is less than or equal to the third threshold value (step S104, Yes), it determines that there is a ground fault in the first system 11 (step S105) and ends the process. At this time, the main abnormality determination unit 32a notifies the automatic driving control device 110 that a ground fault has occurred in the first system 11. Thereby, the automatic driving control device 110 operates the FOP load 101 to start the evacuation running of the vehicle.

[0065] Also, when the abnormal determination unit 32a determines that the voltage V1 of the first system 11 is not less than the third threshold value (step S104, No), it determines whether the voltage V2 of the second system 21 is less than the third threshold value (step 106). When the abnormal determination unit 32a determines that the voltage V2 of the second system 21 is less than the third threshold value (step S106, Yes), it determines that there is a ground fault in the second system 21 (step S107) and ends the process. In this way, the abnormal determination unit 32a can accurately determine the system in which the ground fault has occurred by comparing the voltage V1 of the first system 11 and the voltage V2 of the second system 21 with a third threshold value smaller than the second threshold value.

[0066] At this time, the abnormal determination unit 32a notifies the automatic driving control device 110 that a ground fault has occurred in the second system 21. As a result, the automatic driving control device 110 operates the FOP load 101 to start the evacuation running of the vehicle. In this embodiment, the third threshold value may be the same as the second threshold value 37, but the accuracy of this determination can be improved by making the third threshold value smaller than the second threshold value 37.

[0067] Also, when the abnormal determination unit 32a determines that the voltage V2 of the second system 21 is not less than the third threshold value (step S106, No), it conducts the battery switch 4 (step S108), conducts the connection part 2 (step S109), and returns to the normal operation. Then, the abnormal determination unit 32a ends the process and starts the process again from step S201.

[0068] Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments represented and described as above. Accordingly, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

Explanation of Signs

[0069] 1, 1a Power control device 10 First power supply 20 Second power supply 11 First system 21 Second system 2 Connection part 3, 3a Control unit 31 First control unit 32 Second control unit 33 First comparator 34 Second comparator 35 OR circuit 36 First threshold value 37 Second threshold value 31a Temporary abnormality determination unit 32a True abnormality determination unit 4 Battery switch 51 First voltage sensor 52 Second voltage sensor 101 FOP load 102 General load 110 Automatic driving control device

Claims

1. A first system that supplies the power of a first power supply to a first load, A second system that supplies the power of a second power supply to a second load, A connection part that connects the first system and the second system, When the voltage of the first power supply becomes equal to or lower than a first threshold value, the connection part is cut off, A first control unit having hardware that, when the voltage of the first power supply becomes equal to or lower than the first threshold value, or when the voltage of the second power supply becomes equal to or lower than a second threshold value smaller than the first threshold value, tentatively determines that an abnormality has occurred in the first system or the second system and cuts off the connection part, A second control unit having software that, after being tentatively determined by the first control unit that an abnormality has occurred, determines the system in which the abnormality has occurred based on the voltage of the first power supply and the voltage of the second power supply A power supply control device comprising:

2. The second control unit compares the voltage of the first power supply and the voltage of the second power supply with a third threshold value that is equal to or lower than the second threshold value, and determines the system in which an abnormality has occurred. The power supply control device according to claim 1.

3. A first system that supplies the power of a first power supply to a first load, A second system that supplies the power of a second power supply to a second load, A connection part that connects the first system and the second system, A tentative abnormality determination unit having software that, when the voltage of the first power supply becomes equal to or lower than a first threshold value, or when the voltage of the second power supply becomes equal to or lower than a second threshold value smaller than the first threshold value, tentatively determines that an abnormality has occurred in the first system or the second system and cuts off the connection part, An actual abnormality determination unit having software that, after being tentatively determined by the tentative abnormality determination unit that an abnormality has occurred, determines the system in which the abnormality has occurred based on the voltage of the first power supply and the voltage of the second power supply A power supply control device comprising:

4. The actual abnormality determination unit compares the voltage of the first power supply and the voltage of the second power supply with a third threshold value that is equal to or lower than the second threshold value, and determines the system in which an abnormality has occurred. The power supply control device according to claim 3.

5. A first system that supplies the power of a first power supply to a first load, A second system that supplies the power of a second power supply to a second load, A connection part that connects the first system and the second system A power supply control method in which a control device controls a power supply device comprising: When the voltage of the first power supply becomes equal to or lower than a first threshold value, or when the voltage of the second power supply becomes equal to or lower than a second threshold value smaller than the first threshold value, tentatively determines that an abnormality has occurred in the first system or the second system and cuts off the connection part, After temporarily determining that the abnormality has occurred, determine the system in which the abnormality has occurred based on the voltage of the first power supply and the voltage of the second power supply. Power supply control method.

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