Power supply device and control method

Abstract

To provide a power supply device and a control method that can reliably perform backup control in a mode requiring backup control in the event of an abnormality.SOLUTION: A power supply device 1 includes a first system 110 for supplying the power of a first power supply 10 to a first load 101, a second system 120 for supplying the power of a second power supply 20 to a second load 102, an inter-system switch 4 capable of connecting and disconnecting the first system and the second system, a controller 31 for performing backup control to shut off the inter-system switch when a power failure of one of the first system and the second system is detected, and causes power supply by the other system in which no power failure occurs, and a determination unit 32 for determining disconnection of the second system before switching from a first mode that does not require backup control in the event of an abnormality to a second mode that requires backup control in the event of an abnormality.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, there has been a redundant power supply system that is provided with a first power supply and a second power supply so that, even if a power failure occurs while the vehicle is traveling, the vehicle can be evacuated to a safe place and stopped. In the event that a ground fault occurs in one of the power supply systems, power is supplied to on-board equipment (load) by the other power supply system.

[0003] The redundant power supply system comprises a first system that supplies power from a first power source to a first load, a second system that supplies power from a second power source to a second load having the same functions as the first load, and an inter-system switch that can connect and disconnect the first system and the second system (see, for example, Patent Document 1).

[0004] In normal operation, the redundant power supply system connects the inter-system switch to supply power from the first power supply to the first load and the second load. When a power supply failure such as a ground fault occurs in the first system, the redundant power supply system performs backup control by shutting off the inter-system switch and supplying power from the second power supply to the second load. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-61240 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the redundant power supply system switches from a mode that does not require backup control in the event of an abnormality, such as a manual operation mode, to a mode that does require backup control in the event of an abnormality, such as an automatic operation mode, if a disconnection occurs in the second system, backup control cannot be performed when necessary.

[0007] One aspect of the embodiment has been made in consideration of the above, and aims to provide a power supply device and a control method that can reliably perform backup control in a mode that requires backup control in the event of an abnormality. [Means for solving the problem]

[0008] A power supply device according to an embodiment includes a first system, a second system, an inter-system switch, a control unit, and a determination unit. The first system supplies power from a first power source to a first load. The second system supplies power from a second power source to a second load. The inter-system switch is capable of disconnecting the first system and the second system. When the control unit detects a power failure in one of the first system and the second system, the control unit shuts off the inter-system switch and performs backup control to supply power from the other system in which no power failure has occurred. The determination unit determines a disconnection of the second system before switching from a first mode that does not require backup control in the event of an abnormality to a second mode that requires backup control in the event of an abnormality. Effect of the Invention

[0009] A power supply device and a control method according to an aspect of the embodiment provide an effect of being able to reliably perform backup control in a mode requiring backup control. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram showing an example of the configuration of a power supply device according to a first embodiment. [Diagram 2] FIG. 2 is an explanatory diagram showing an example of the operation of the power supply device according to the first embodiment. [Diagram 3] FIG. 3 is an explanatory diagram showing an example of the operation of the power supply device according to the first embodiment. [Figure 4] FIG. 4 is an explanatory diagram showing an example of the operation of the power supply device according to the first embodiment. [Diagram 5] FIG. 5 is a flowchart showing an example of processing executed by the power supply device according to the first embodiment. [Figure 6] FIG. 6 is an explanatory diagram showing an example of the operation of the power supply device according to the second embodiment. [Figure 7] FIG. 7 is a flowchart showing an example of processing executed by the power supply device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of a power supply device and a control method will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the following embodiment. Below, a power supply device that is mounted on a vehicle with an automatic driving function and supplies power to a load will be described as an example, but the power supply device according to the embodiment may be mounted on a vehicle that does not have an automatic driving function.

[0012] [1. First embodiment] [1.1. Power supply configuration] As shown in FIG. 1, a power supply device 1 according to the first embodiment is connected to a first power supply 10, a first load 101, a second load 102, and an automatic driving control device 100.

[0013] The first load 101 and the second load 102 include loads for autonomous driving. For example, the first load 101 includes a steering motor, an electric brake device, an in-vehicle camera, a radar, and the like that operate during autonomous driving. The first load 101 also includes general loads such as a display, an air conditioner, an audio device, a video device, and various lights.

[0014] The second load 102 includes at least devices that operate during automatic driving, such as a steering motor, an electric brake device, an in-vehicle camera, and a radar. The first load 101 and the second load 102 operate with power supplied from the power supply device 1. The automatic driving control device 100 is a device that operates the first load 101 and the second load 102 to control the automatic driving of the vehicle.

[0015] The first power source 10 includes a DC / DC converter (hereinafter, referred to as "DC / DC 11") and a lead battery (hereinafter, referred to as "PbB 12"). The battery of the first power source 10 may be any secondary battery other than PbB 12.

[0016] The DC / DC 11 is connected to a generator that converts the vehicle's regenerative energy into electric power to generate electricity, and transforms and outputs the input voltage input from the generator. If the vehicle is equipped with an engine, the generator may be an alternator that converts the rotational force of the engine into electric power to generate electricity. The DC / DC 11 charges the PbB 12, supplies electric power to the first load 101, supplies electric power to the second load 102, and charges the second power source 20 described below.

[0017] The power supply device 1 includes a second power source 20, an inter-system switch 4, a control unit 31, and a determination unit 32. The power supply device 1 further includes current sensors 51 and 52, and a voltage sensor 53. The second power source 20 is a backup power source in case the first power source 10 is unable to supply power.

[0018] The second power source 20 includes a lithium ion battery (hereinafter, referred to as "LiB21") and a battery switch 22. The battery switch 22 connects the LiB21 and the second load 102 in a manner that allows them to be disconnected. Note that the battery of the second power source 20 may be any secondary battery other than the LiB21.

[0019] The power supply device 1 includes a first system 110 that supplies power from a first power source 10 to a first load 101, and a second system 120 that supplies power from a second power source 20 to a second load 102. The inter-system switch 4 connects the first system 110 and the second system 120 in a manner that allows them to be disconnected.

[0020] A current sensor 51 is connected between the inter-system switch 4 and the first system 110. The current sensor 51 may be connected between the inter-system switch 4 and the second system 120. The current sensor 51 detects a current value of a current flowing through the inter-system switch 4, and outputs the detection result to the control unit 31.

[0021] A current sensor 52 and a voltage sensor 53 are connected between the second power source 20 and the second load 102. The current sensor 52 may be provided at any position between the second power source 20 and the second load 102 as long as the current sensor 52 is able to detect the current value of the current flowing through the second system 120. The current sensor 52 outputs the detection result of the current value to the determination unit 32.

[0022] The voltage sensor 53 is connected between a connection point P between the second system 120 and the inter-system switch 4, and the second load 102. The voltage sensor 53 detects a voltage value of the second system 120, and outputs the detection result to the control unit 31.

[0023] The control unit 31 and the determination unit 32 include a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and various circuits. The control unit 31 and the determination unit 32 may be configured with hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0024] The control unit 31 controls the operation of the power supply device 1 by causing the CPU to execute a program stored in the ROM using the RAM as a working area. The control unit 31 controls the on / off of the inter-system switch 4 and the battery switch 22 based on the detection result input from the current sensor 51, and supplies power from the first power source 10 or the second power source 20 to the first load 101 and the second load 102.

[0025] When a power failure occurs in one of the first system 110 and the second system 120, the control unit 31 supplies power to the load through the other system. In this way, the power supply device 1 can cause the automatic driving control device 100 to drive the vehicle to a safe place and stop the vehicle.

[0026] The judgment unit 32 judges whether or not there is a break in the second system 120 based on at least one of the detection results input from the current sensor 52 and the voltage sensor 53 by the CPU executing a program stored in the ROM using the RAM as a working area.

[0027] The judgment unit 32 judges whether or not there is a break in the second system 120 before switching from a first mode, which does not require backup control of the power supply in the event of an abnormality, to a second mode, which requires backup control of the power supply in the event of an abnormality, and outputs the judgment result to the control unit 31.

[0028] The first mode is, for example, a manual driving mode in which the vehicle is driven manually, and the second mode is an automatic driving mode in which the vehicle is driven automatically by the automatic driving control device 100.

[0029] The mode that does not require backup control in the event of an abnormality is not limited to the manual operation mode, and the mode that requires backup control in the event of an abnormality is not limited to the automatic operation mode.

[0030] In this way, in the power supply device 1, the determination unit 32 determines a disconnection in the second system 120 before switching from the first mode to the second mode. This allows the power supply device 1 to reliably perform backup control of the power supply when it becomes necessary.

[0031] [1.2. Normal operation of the power supply] During normal operation when no power failure has occurred in the first system 110 and the second system 120, the control unit 31 connects the inter-system switch 4 and cuts off the battery switch 22 as shown in FIG. 2, to supply power from the first power source 10 to the first load 101 and the second load 102.

[0032] In such a power supply device 1, a ground fault may occur in the first system 110 or the second system 120 during normal operation. In the example shown in Fig. 3, a ground fault 200 occurs in the first system 110. In such a case, the control unit 3 performs an operation for when a ground fault occurs.

[0033] [1.3. Operation when a ground fault occurs] The control unit 31 detects the occurrence of a ground fault 200 based on the detection result input from the current sensor 51. The control unit 31 detects that a ground fault has occurred in the first system 110 or the second system 120 when the current value detected by the current sensor 51 is an overcurrent exceeding a ground fault threshold value.

[0034] Furthermore, when the control unit 31 detects that a ground fault has occurred in the first system 110 or the second system 120, it turns off the inter-system switch 4 and turns on the battery switch 22 for a certain period of time to detect the system that has a ground fault. For example, after turning on the battery switch 22, if the current sensor 52 exceeds the ground fault threshold, it is determined that the second system 120 has a ground fault.

[0035] Moreover, if the current sensor 52 does not exceed the ground fault threshold value after the battery switch 22 is turned on, it is determined that the first system 110 has a ground fault. Note that a current sensor may also be provided in the first system 110, and after the battery switch 22 is turned on, the current values ​​detected by the current sensor of the first system 110 and the current sensor 52 of the second system may be compared to determine which system has a ground fault.

[0036] The control unit 31 may also normally connect the battery switch 22. In that case, when an overcurrent flows from the second system 120 to the first system 110, the control unit 31 determines that a ground fault 200 has occurred in the first system 110. When an overcurrent flows from the first system 110 to the second system 120, the control unit 31 determines that a ground fault has occurred in the second system 120.

[0037] If a ground fault occurs and the inter-system switch 4 remains connected, the power stored in the first power source 10 and the second power source 20 will be discharged, making it impossible to evacuate the vehicle. Therefore, as shown in Fig. 3, when the control unit 31 detects, for example, a ground fault 200, which is a power source failure, in the first system 110, it performs backup control to supply power from the second power source 20 to the second load 102 by shutting off the inter-system switch 4 and connecting the battery switch 22.

[0038] This allows the automatic driving control device 100 to drive the vehicle to an evacuation site using the second load 102. When a ground fault is detected in the second system 120, the control unit 31 shuts off the system switch 4 and the battery switch 22, and supplies power from the first power source 10 to the first load 101 to allow the vehicle to drive to an evacuation site.

[0039] However, if a disconnection 201 occurs in the second system 120 when the power supply device 1 performs backup control using the second power supply 20, the power supply device 1 cannot supply power from the second power supply 20 to the second load 102 even if the battery switch 22 is connected. Therefore, the power supply device 1 determines whether or not there is a disconnection in the second system 120 before switching from the first mode to the second mode. Next, the disconnection determination by the determination unit 32 will be described with reference to FIG.

[0040] [1.4. Disconnection detection] The determination unit 32 performs a disconnection determination for the second system 120, for example, when the power supply device 1 is performing a normal operation in the first mode and there is a request to switch to the second mode.

[0041] That is, when a switching request is received, before switching from the first mode to the second mode, the determination unit 32 performs a disconnection determination for the second system 120. For example, when a switching request from the manual driving mode to the automatic driving mode is input from the automatic driving control device 100, the determination unit 32 performs a disconnection determination for the second system 120.

[0042] 4, the determination unit 32 first causes the control unit 31 to turn off the inter-system switch 4 and determines whether or not there is a disconnection in the second system 120 while keeping the battery switch 22 conductive. This allows the determination unit 32 to determine whether or not there is a disconnection in the second system 120 while continuing the power supply from the first power source 10 to the first load 101.

[0043] If there is no break in the second system 120, a current flows from the second power source 20 to the second load 102, and therefore the determination unit 32 determines that there is no break in the second system 120 if the current value input from the current sensor 52 is a normal value. The normal value here is a current value sufficient to operate the second load 102 normally. The determination unit 32 determines that there is a break in the second system 120 if the current value input from the current sensor 52 is not a normal value (for example, 0).

[0044] Furthermore, if the voltage value input from the voltage sensor 53 is a normal value, the determination unit 32 determines that there is no disconnection in the second system 120. The normal value here is a voltage value that is sufficient for the second load 102 to operate normally. If the voltage value input from the voltage sensor 53 is not a normal value (for example, 0), the determination unit 32 determines that there is a disconnection in the second system 120.

[0045] For example, if the voltage sensor 53 is provided between the battery switch 22 and the connection point P, the voltage sensor 53 will detect a normal voltage value when the battery switch 22 is connected if there is a disconnection between the voltage sensor 53 and the connection point P. In this case, the determination unit 32 will erroneously determine that there is no disconnection in the second system 120, even though there is actually a disconnection.

[0046] For this reason, the power supply device 1 includes a voltage sensor 53 between the connection point P and the second load 102. This allows the determination unit 32 to accurately determine a disconnection between the battery switch 22 and the voltage sensor 53 based on the result of detection of the voltage value by the voltage sensor 53.

[0047] In addition, the judgment unit 32 can judge whether or not there is a break in the line between the voltage sensor 53 and the second load 102 based on whether or not the voltage sensor 53 detects a normal voltage value during normal operation (when the inter-system switch 4 is connected).

[0048] The determination unit 32 outputs a determination result of the disconnection in the second system 120 to the control unit 31. When a disconnection in the second system 120 is detected, the control unit 31 prohibits the automatic driving control device 100 from switching to the second mode.

[0049] Furthermore, the control unit 31 permits the automatic driving control device 100 to switch to the second mode when no break is detected in the second system 120. In this way, the power supply device 1 permits switching to the second mode only when there is no break in the second system 120 and backup control can be reliably performed, thereby improving the safety of the vehicle during automatic driving.

[0050] [1.5. Processing performed by the power supply] Next, an example of the process executed by the power supply device 1 according to the first embodiment will be described with reference to Fig. 5. The power supply device 1 repeatedly executes the process shown in Fig. 5 while the vehicle is powered on.

[0051] 5, the control unit 31 first determines whether or not there is a request to switch from the first mode to the second mode (step S101). If the control unit 31 determines that there is no request to switch (step S101, No), it ends the process and starts the process again from step S101.

[0052] Furthermore, when the control unit 31 determines that there is a switching request (step S101, Yes), it turns off the system switch 4 (step S102) and turns on the battery switch 22 (step S103). After that, the determination unit 32 determines whether the current value and the voltage value of the second system 120 are normal or not (step S104).

[0053] When the control unit 31 determines that the current value and the voltage value of the second system 120 are normal (step S104, Yes), it permits switching from the first mode to the second mode (step S105). Then, the control unit 31 turns on the inter-system switch 4 (step S107) and turns off the battery switch 22 (step S108). After that, the control unit 31 starts the process again from step S101.

[0054] Furthermore, when it is determined that the current value and the voltage value of the second system 120 are not normal (step S104, No), the control unit 31 prohibits switching from the first mode to the second mode (step S106). Next, the control unit 31 turns on the inter-system switch 4 (step S107) and turns off the battery switch 22 (step S108). After that, the control unit 31 starts the process again from step S101.

[0055] Note that, here, the case has been described in which the judgment unit 32 judges whether or not there is a disconnection in the second system 120 based on the current value and voltage value of the second system 120, but the judgment unit 32 can also judge whether or not there is a disconnection in the second system 120 based on either the current value or the voltage value of the second system 120.

[0056] In this case, if the current value is normal, the determination unit 32 shifts the process to step S105, and if the current value is not normal, the determination unit 32 shifts the process to step S106. Also, if the voltage value is normal, the determination unit 32 shifts the process to step S105, and if the voltage value is not normal, the determination unit 32 shifts the process to step S106.

[0057] [2. Second embodiment] [2.1. Power supply configuration] Next, a power supply device 1a according to a second embodiment will be described with reference to Fig. 6. Here, among the components shown in Fig. 6, the components that are the same as those shown in Fig. 1 are given the same reference numerals as those shown in Fig. 1, and duplicated descriptions will be omitted.

[0058] 6, the power supply device 1a differs from the power supply device 1 according to the first embodiment in that it includes a memory 33 and in the operations of a control unit 31a and a determination unit 32a. The determination unit 32a performs a disconnection determination for the second system 120 when a predetermined charge / discharge timing for the second power source 20 arrives.

[0059] The predetermined timing for charging and discharging the second power source 20 is, for example, when the ignition switch of the vehicle is turned on. Also, the predetermined timing for charging and discharging the second power source 20 is when the state of charge (SOC) of the second power source 20 is periodically estimated while the vehicle is running.

[0060] When a predetermined timing for charging or discharging the second power source 20 arrives, the determination unit 32a determines whether or not there is a disconnection in the second system 120 by the same method as in the first embodiment. Specifically, when charging or discharging the second power source 20, the determination unit 32a makes the control unit 31a cut off the inter-system switch 4 and temporarily turns on the battery switch 22 to perform the disconnection determination for the second system 120.

[0061] Since the battery switch 22 needs to be turned on when the second power source 20 is charged or discharged, by determining the presence or absence of a disconnection in the second system 120 at that timing, it is not necessary to turn on the battery switch 22 just to check for a disconnection. This reduces the number of times the battery switch 22 is operated, and improves the durability of the battery switch 22.

[0062] At this time, if both or either of the current value and the voltage value of the second system 120 are normal values, the determination unit 32a determines that there is no disconnection in the second system 120. Furthermore, if both or either of the current value and the voltage value of the second system 120 are not normal (for example, 0), the determination unit 32a determines that there is a disconnection in the second system 120. Then, the determination unit 32a stores the determination result of the disconnection in the memory 33.

[0063] Before switching from the first mode to the second mode, the control unit 31a checks the result of the determination of the disconnection stored in the memory 33. When the power supply device 1 is performing normal operation in the first mode and a request to switch to the second mode is made, the control unit 31a checks the result of the determination of the disconnection stored in the memory 33.

[0064] For example, when a request to switch from the manual driving mode to the automatic driving mode is input from the automatic driving control device 100, the control unit 31a checks the disconnection determination result stored in the memory 33.

[0065] That is, when a switching request is made, the control unit 31a checks the disconnection determination result stored in the memory 33 before switching from the first mode to the second mode.

[0066] Then, when the control unit 31a checks that there is no disconnection in the second system 120, the control unit 31a permits switching to the second mode. Also, when the control unit 31a checks that there is a disconnection in the second system 120, the control unit 31a prohibits switching to the second mode. In this way, when there is a request to switch from the first mode to the second mode, the switching can be performed immediately by simply checking the disconnection determination result stored in the memory 33.

[0067] In this way, the judgment unit 32a of the power supply device 1a repeats the disconnection judgment of the second system 120 every time a predetermined charging / discharging timing of the second power source 20 occurs and stores the judgment result in the memory 33, thereby improving the reliability of the judgment result.

[0068] Then, before switching to the second mode, the control unit 31a checks the determination result stored in the memory 33 and determines whether to permit or prohibit switching to the second mode.

[0069] As a result, the control unit 31a permits switching to the second mode only when there is no disconnection in the second system 120 and backup control can be performed reliably, thereby improving the safety of the vehicle during autonomous driving. Moreover, the time required to switch from the first mode to the second mode can be shortened while improving the durability of the battery switch 22.

[0070] [2.2. Processing performed by the power supply] Next, an example of the process executed by the power supply device 1a according to the second embodiment will be described with reference to Fig. 7. The power supply device 1a repeatedly executes the process shown in Fig. 7 while the vehicle is powered on.

[0071] 7, the control unit 31a first determines whether or not it is time to charge or discharge the second power source 20 (step S201). If the control unit 31a determines that it is not time to charge or discharge the second power source 20 (step S201, No), the control unit 31a moves the process to step S211.

[0072] Furthermore, when the control unit 31a determines that it is time to charge or discharge the second power source 20 (Yes at step S201), it turns on the inter-system switch (step S202) and charges or discharges the second power source 20 (step S203).

[0073] Thereafter, the control unit 31a judges whether or not the charging and discharging are completed (step S204). If the control unit 31a judges that the charging and discharging are not completed (step S204, No), it repeats the judgment process of step S204 until the charging and discharging are completed. Then, if the control unit 31a judges that the charging and discharging are completed (step S204, Yes), it turns off the system switch 4 (step S205).

[0074] Thereafter, the determination unit 32a determines whether the current value and the voltage value of the second system 120 are normal (step S206). If the determination unit 32a determines that the current value and the voltage value of the second system 120 are normal (step S206, Yes), the determination unit 32a stores in the memory 33 that there is no disconnection in the second system 120 (step S207) and proceeds to step S209.

[0075] If the judgment unit 32a judges that the current value and the voltage value of the second system 120 are not normal (step S206, No), the judgment unit 32a stores in the memory 33 that there is a disconnection in the second system 120 (step S208) and proceeds to step S209.

[0076] In step S209, the control unit 31a turns on the system switch 4. After that, the control unit 31a turns off the battery switch 22 (step S210) and determines whether or not there is a request to switch from the first mode to the second mode (step S211). If the control unit 31a determines that there is no request to switch (step S211, No), it ends the process and starts the process again from step S201.

[0077] Furthermore, when the control unit 31a determines that there is a switching request (step S211, Yes), the control unit 31a checks the determination result stored in the memory 33 (step S212). Then, the control unit 31a determines, based on the check result, whether or not there is a break in the second system 120 (step S213).

[0078] When the control unit 31a determines that there is no disconnection (Yes at step S213), it permits switching from the first mode to the second mode (step S214). After that, the control unit 31a starts the process again from step S201.

[0079] Furthermore, when the control unit 31a determines that there is a disconnection (step S213, No), it prohibits switching from the first mode to the second mode (step S215). After that, the control unit 31a starts the process again from step S201.

[0080] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0081] 1,1a power supply 10 1st power supply 11 DC / DC 12 PbB 20 2nd power supply 21 LiB 22 Battery switch 31, 31a Control section 32,32a Judgment part 4-system switch 51,52 Current sensor 53 Voltage Sensor 100 Automatic driving control device 101 1st load 102 2nd load 110 System 1 120 System 2

Claims

1. a first system that supplies power from a first power source to a first load; a second system that supplies power from a second power source to a second load; an inter-system switch capable of connecting and disconnecting the first system and the second system; a control unit that performs backup control in which, when a power failure of one of the first system and the second system is detected, the inter-system switch is shut off and power is supplied from the other system that is not experiencing a power failure; a determination unit that determines whether or not the second system is disconnected before switching from a first mode that does not require backup control in the event of an abnormality to a second mode that requires backup control in the event of an abnormality; A power supply device comprising:

2. a battery switch capable of connecting and disconnecting the second power supply and the second system; The determination unit is The system switch is turned off and the battery switch is turned on to determine whether or not the disconnection has occurred.

2. The power supply device according to claim 1 .

3. The control unit is When the disconnection is detected by the determination unit, switching to the second mode is prohibited, and when the disconnection is not detected, switching to the second mode is permitted.

3. The power supply device according to claim 1 or 2.

4. The determination unit is When the second power source is charged or discharged, the battery switch is temporarily turned on to determine whether or not the second power source is disconnected, and the determination result is stored in a memory; The control unit is The determination result stored in the memory is confirmed before switching to the second mode.

4. The power supply device according to claim 1, wherein the first and second electrodes are electrically connected to the first and second electrodes.

5. a first system that supplies power from a first power source to a first load; a second system that supplies power from a second power source to a second load; an inter-system switch capable of connecting and disconnecting the first system and the second system; A control method for a power supply device comprising: A control unit of the power supply device When a power failure of one of the first system and the second system is detected, the inter-system switch is shut off and backup control is performed to supply power from the other system that is not experiencing a power failure. A determination unit of the power supply device determining a disconnection of the second system before switching from a first mode not requiring backup control in the event of an abnormality to a second mode requiring backup control in the event of an abnormality; A control method comprising:

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