Power supply device, control method, and control program

Abstract

To provide a power supply device that can suppress the number of times of operation of a system main relay from increasing accompanying execution of pump-out control, so as to reduce influence on a service life of a component of the system main relay.SOLUTION: A power supply device comprises a relay provided between a high-voltage battery and one or more on-vehicle instruments, and a control part that controls supply of electric power from the high-voltage battery to the one or more on-vehicle instruments, by switching ON / OFF of the relay, on the basis of a state of a main switch that actuates a travelling system of a vehicle. When the main switch is turned OFF with the relay turned ON, the control part makes the high-voltage battery supply electric power to a specific on-vehicle instrument while maintaining the relay in an ON state, when the one or more on-vehicle instruments include the specific on-vehicle instrument that is actuated after the main switch is turned OFF.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a power supply device mounted on a vehicle. [Background technology]

[0002] Patent Document 1 discloses a power supply device that performs so-called pumping control, in which when the power consumption of on-board equipment powered by the auxiliary battery is greater than a predetermined value when the vehicle's main switch is turned off and the vehicle is unable to drive, the high-voltage battery supplies power to the on-board equipment while the power consumption is high. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-205275 Summary of the Invention [Problem to be solved by the invention]

[0004] To perform pumping control, the system main relay (SMR), which is located between the high-voltage battery and the on-board devices powered by the auxiliary battery, must be switched on and off each time pumping control is performed. To improve the component life of this system main relay, it is preferable to minimize the number of times the system main relay operates to reduce the impact of heat generated by switching. For this reason, there is room for improvement in the method of performing pumping control.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a power supply device and the like that can suppress an increase in the number of times the system main relay is operated due to the implementation of pumping control, thereby reducing the impact on the component life of the system main relay. [Means for solving the problem]

[0006] In order to solve the above problem, one aspect of the disclosed technology is a power supply device mounted on a vehicle, comprising: a relay provided between a high-voltage battery and one or more on-board devices; and a control unit that switches the relay ON / OFF based on the state of a main switch that operates the vehicle's driving system, and controls the supply of power from the high-voltage battery to the one or more on-board devices; when the main switch is turned OFF while the relay is ON, if there is a specific on-board device among the one or more on-board devices that will operate after the main switch is turned OFF, the control unit keeps the relay ON and supplies power from the high-voltage battery to the specific on-board device. [Effects of the Invention]

[0007] According to the power supply device and the like of the present disclosure, it is possible to suppress an increase in the number of times the system main relay is activated due to the execution of pumping control, thereby reducing the impact on the component life of the system main relay. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a functional block diagram of a power supply device and its peripheral components according to an embodiment of the present disclosure; [Figure 2] A flowchart of the control process executed by the power supply device when the system main relay is ON [Figure 3] A flowchart of the control process executed by the power supply device when the system main relay is in the OFF state. [Figure 4] Processing flowchart of an application example of control when the power supply device is in the ON state of the system main relay when the vehicle is dismounted DETAILED DESCRIPTION OF THE INVENTION

[0009] In the power supply device of the present disclosure, if there is a specific auxiliary load that operates when the vehicle is dismounted among the auxiliary loads that use the auxiliary battery as its main power source, the power supply device performs pumping control to supply power from the high-voltage battery to the specific auxiliary load without switching the system main relay from ON to OFF and keeping it in the ON state when the vehicle is dismounted. This control reduces the number of times the system main relay operates due to the implementation of the pumping control. Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0010] <Embodiment> [composition] Fig. 1 is a functional block diagram of a power supply device 20 and its peripheral components according to an embodiment of the present disclosure. The functional block illustrated in Fig. 1 includes a high-voltage battery 10, the power supply device 20, an auxiliary battery 30, and multiple auxiliary loads 41 and 42. Note that in Fig. 1, power signal lines are indicated by solid lines, and control / communication signal lines are indicated by dashed lines. This power supply device 20 can be mounted on vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs), which use electric motors as their power sources.

[0011] The high-voltage battery 10 is a rechargeable secondary battery, such as a lithium-ion battery, and is a drive battery that supplies power to so-called main engines mounted on the vehicle, such as a starter motor and an electric traction motor (not shown). The high-voltage battery 10 can supply power to the main engine via a system main relay 21, which will be described later. The high-voltage battery 10 can also supply power to a control unit 22, which will be described later, via the system main relay 21.

[0012] The auxiliary battery 30 is a secondary battery configured to be chargeable and dischargeable, such as a lead-acid battery or a lithium-ion battery, and is a battery that supplies power to so-called auxiliaries mounted on a vehicle including a plurality of auxiliary loads 41 and 42. The auxiliary battery 30 can be charged using power from the high-voltage battery 10. In general, the rated voltage of the auxiliary battery 30 is set lower than that of the high-voltage battery 10.

[0013] The multiple auxiliary loads 41 and 42 are devices mounted on the vehicle, such as devices and equipment that consume power necessary to perform a predetermined operation. The multiple auxiliary loads 41 and 42 include, for example, specific in-vehicle devices (e.g., electronic exterior mirrors and a vehicle exit assistance system) that operate in conjunction with a standard operation pattern, such as when the vehicle door is opened or closed or when the ignition switch is turned on or off. The multiple auxiliary loads 41 and 42 operate using power supplied from the power supply device 20 or power stored in the auxiliary battery 30. Note that, although FIG. 1 shows an example in which two auxiliary loads 41 and 42 are mounted on the vehicle, the number of auxiliary loads mounted on the vehicle is not limited.

[0014] The power supply device 20 is a device for managing the power balance in the vehicle by controlling the charging and discharging of the high-voltage battery 10 and the auxiliary battery 30. The power supply device 20 according to this embodiment includes a system main relay (SMR) 21 and a control unit 22.

[0015] The system main relay 21 is a switching element for controlling the state of power exchange of the high-voltage battery 10, and is provided between the high-voltage battery 10 and the control unit 22. Based on instructions from the control unit 22, the system main relay 21 can switch between a state in which the input and output terminals are electrically connected (ON) and a state in which the input and output terminals are electrically disconnected (OFF).

[0016] The control unit 22 is configured to control the power supply from the high-voltage battery 10 to the auxiliary battery 30 and the multiple auxiliary loads 41 and 42. The control unit 22 switches the system main relay 21 ON / OFF based on the ON / OFF state of an ignition switch (IG), which is a main switch for operating a system related to vehicle driving (hereinafter referred to as the "vehicle driving system"), and the setting state of the multiple auxiliary loads 41 and 42 for operation. Furthermore, when the system main relay 21 is ON, the control unit 22 can supply power of a predetermined voltage from the high-voltage battery 10 to the auxiliary battery 30 and the multiple auxiliary loads 41 and 42. When supplying power, the control unit 22 can convert (DC-DC convert) the voltage of the high-voltage battery 10, which is the input voltage, into a predetermined voltage specified for the auxiliary battery 30 and output it.

[0017] A part or all of this control unit 22 may be configured by an electronic control unit (ECU) that typically includes a processor such as a microcomputer, a memory, an input / output interface, etc. This electronic control unit can realize a part or all of the above-mentioned functions by having the processor read and execute a program stored in the memory.

[0018] [control] Next, control executed by power supply device 20 according to this embodiment will be described with further reference to Figures 2 to 4. The control executed by power supply device 20 can be described as being divided into control when getting off the vehicle and control when getting on. In the following description, when an occupant such as a driver gets off the vehicle will be referred to as "when getting off the vehicle," when an occupant gets on the vehicle will be referred to as "when getting on / off the vehicle," and when both of these are covered, it will be referred to as "when getting on / off the vehicle."

[0019] (1) Control when getting off Figure 2 is a flowchart showing the processing procedure for control (vehicle dismounting control) executed by the control unit 22 of the power supply device 20 when the vehicle dismounts while the vehicle's driving system is operating (the vehicle is capable of driving) and the system main relay 21 is connected (SMR=ON).

[0020] (Step S201) The control unit 22 of the power supply device 20 determines whether or not there is an auxiliary load (specific on-board equipment) among the multiple auxiliary loads 41 and 42 mounted on the vehicle that will operate when the driver or driver gets on or off the vehicle. More specifically, the control unit 22 determines whether or not there is an auxiliary load that will operate after the main switch that activates the vehicle's driving system is turned off. Examples of auxiliary loads that may be subject to this determination include electronic exterior mirrors and a vehicle exit assistance system. Note that some vehicles allow a user, such as a driver, to customize whether or not these auxiliary loads that may be subject to this determination will operate when the driver or driver gets on or off the vehicle. The control unit 22 of this embodiment supports such customization and determines whether or not each auxiliary load is set to operate when the driver or driver gets on or off the vehicle while the main switch that activates the vehicle's driving system is on is on. The setting and management of whether or not each auxiliary load is operable may be performed by the control unit 22 or by another component (not shown).

[0021] If the control unit 22 determines that there is an auxiliary load that is set to be activated when a passenger gets on or off the vehicle (YES in step S201), the process proceeds to step S202. On the other hand, if the control unit 22 determines that there is no auxiliary load that is set to be activated when a passenger gets on or off the vehicle (NO in step S201), the process proceeds to step S203.

[0022] (Step S202) When getting on or off the vehicle, the control unit 22 of the power supply device 20 requests that power be supplied from the high-voltage battery 10 to the auxiliary battery 30, that is, requests that power be supplied to auxiliary loads that are set to operate when getting on or off the vehicle, and sets a so-called pumping request to "yes." This pumping request can be set to "yes," for example, by setting a predetermined flag. When the control unit 22 sets the pumping request to "yes," the process proceeds to step S204.

[0023] (Step S203) When getting on or off the vehicle, the control unit 22 of the power supply device 20 sets the pumping request, which requests that power be supplied from the high-voltage battery 10 to the auxiliary battery 30, to "None." This pumping request can be set to "None," for example, by not setting a specific flag. When the control unit 22 sets the pumping request to "None," the process proceeds to step S204.

[0024] The pumping request described above may be set independently for the auxiliary load that operates when the passenger gets off the vehicle and the auxiliary load that operates when the passenger gets on the vehicle. By setting the pumping request separately for when the passenger gets off the vehicle and when the passenger gets on the vehicle, it is possible to avoid unnecessary pumping processes.

[0025] (Step S204) The control unit 22 of the power supply device 20 determines whether a main switch that operates the vehicle's driving system has been turned off. That is, the control unit 22 determines whether the vehicle has transitioned to a state in which it cannot be driven (such as a parked state) so that an occupant can get out of the vehicle. An example of this main switch is the vehicle's ignition switch (IG).

[0026] If the control unit 22 determines that the main switch is turned off (IG-OFF) (step S204, Yes), the process proceeds to step S205. On the other hand, if the control unit 22 determines that the main switch is not turned off (IG-ON) (step S204, No), the process proceeds to step S201.

[0027] (Step S205) The control unit 22 of the power supply device 20 determines whether or not a pumping request requesting power supply from the high-voltage battery 10 to the auxiliary battery 30 is set to "Yes" during the period when the main switch is ON. If separate pumping requests are set for when the vehicle is dismounted and when the vehicle is mounted, it is sufficient to determine in this step whether or not a pumping request is made when the vehicle is dismounted.

[0028] If the control unit 22 determines that the pumping request is set to "Yes" (step S205, Yes), the process proceeds to step S206. On the other hand, if the control unit 22 determines that the pumping request is set to "No" (step S205, No), the process proceeds to step S207.

[0029] (Step S206) The control unit 22 of the power supply device 20 performs a pumping process to supply power from the high-voltage battery 10 to the auxiliary battery 30, i.e., at least to the auxiliary loads that operate when the vehicle is dismounted, while keeping the system main relay 21 connected (SMR = ON). The duration and timing of this pumping process are set for each auxiliary load based on, for example, regulations and vehicle specifications. As an example, electronic exterior mirrors are required to operate continuously for a maximum of seven minutes both when the vehicle is dismounted and when the vehicle is mounted. Furthermore, a vehicle dismount assistance system is required to operate continuously for a maximum of three minutes only when the vehicle is dismounted. Note that, from the perspective of protecting the auxiliary battery 30 from deterioration, it is preferable that the duration of the pumping process be set to be equal to or longer than the duration of the auxiliary loads that operate when the vehicle is dismounted. Once the control unit 22 has performed the pumping process from the high-voltage battery 10 until the auxiliary loads that operate when the vehicle is dismounted have finished operating, the process proceeds to step S207.

[0030] (Step S207) The control unit 22 of the power supply device 20 shuts off the system main relay 21 (SMR=OFF), thereby electrically disconnecting the high-voltage battery 10 from the system. When the system main relay 21 is shut off by the control unit 22, the vehicle dismount control ends.

[0031] In this disembarking control, if it is known before the passenger gets off that pumping processing will be required when the passenger gets off the vehicle, the pumping processing is performed while the relay is kept ON when the disembarking action (IG-ON) is detected, without switching the system main relay 21 from ON to OFF and then back ON again. This reduces the number of times the system main relay 21 is operated.

[0032] In the above embodiment, an example has been described in which it is determined whether or not to set a pumping request based on the result of whether or not there is at least one auxiliary load (specific on-board device) that operates when passengers get on or off the vehicle in step S201. However, instead of this determination, it may be determined whether or not to set a pumping request based on whether or not the total power consumption of one or more auxiliary loads that operate when passengers get on or off the vehicle exceeds a predetermined value.

[0033] (2) Control during riding Figure 3 is a flowchart showing the processing procedure for control (on-board control) executed by the control unit 22 of the power supply device 20 when the vehicle is boarded in a state in which the vehicle's driving system is stopped (the vehicle is unable to drive) and the system main relay 21 is disconnected (SMR=OFF).

[0034] (Step S301) The control unit 22 of the power supply device 20 determines whether a predetermined operation has been performed on the vehicle. This determination is made to determine the possibility that a vehicle user or the like will get into the vehicle. Examples of the predetermined operation include an operation that can recognize that external access to the vehicle has occurred, such as an operation to unlock the vehicle door using an electronic key or an operation to open the vehicle door by grasping the door handle. The control unit 22 may determine by itself whether a predetermined operation has been performed on the vehicle, or the control unit 22 may acquire a determination made by a component (not shown).

[0035] If the control unit 22 determines that a predetermined operation has been performed on the vehicle (step S301, Yes), the process proceeds to step S302. On the other hand, if the control unit 22 determines that a predetermined operation has not yet been performed on the vehicle (step S301, No), the determination in step S301 is repeated.

[0036] (Step S302) The control unit 22 of the power supply device 20 determines whether a pumping request requesting power supply from the high-voltage battery 10 to the auxiliary battery 30 has been set to "Yes" in a determination made while the main switch was on, such as the previous time the vehicle was running. If separate pumping requests are set for when the vehicle is dismounted and when the vehicle is mounted, it is sufficient to determine in this step whether a pumping request has been made when the vehicle is mounted.

[0037] If the control unit 22 determines that the pumping request is set to "Yes" (step S302, Yes), the process proceeds to step S303. On the other hand, if the control unit 22 determines that the pumping request is set to "No" (step S302, No), the process proceeds to step S305.

[0038] (Step S303) When the pumping request is set to "Yes," the control unit 22 of the power supply device 20 connects the system main relay 21 (SMR=ON). This electrically connects the high-voltage battery 10 to the system. When the system main relay 21 is connected by the control unit 22, the process proceeds to step S304.

[0039] (Step S304) The control unit 22 of the power supply device 20 starts a pumping process to supply power from the high-voltage battery 10 to the auxiliary battery 30, i.e., to the auxiliary loads that operate when the driver is in the vehicle. When the control unit 22 starts the pumping process for the auxiliary loads that operate when the driver is in the vehicle, the process proceeds to step S307.

[0040] (Step S305) When the pumping request is set to "None," control unit 22 of power supply device 20 determines whether the vehicle is ready to run. An example of the state in which the vehicle is ready to run is the Ready-ON state.

[0041] If the control unit 22 determines that the vehicle is ready to run (Ready-ON) (step S305, Yes), the process proceeds to step S306. On the other hand, if the control unit 22 determines that the vehicle is not ready to run (Ready-OFF) (step S305, No), the determination in step S305 is repeated.

[0042] (Step S306) When the vehicle is ready to run (Ready-ON), the control unit 22 of the power supply device 20 connects the system main relay 21 (SMR=ON), electrically connecting the high-voltage battery 10 to the system. When the control unit 22 connects the system main relay 21, the in-ride control ends.

[0043] (Step S307) After starting the pumping process, the control unit 22 of the power supply device 20 determines whether the vehicle is ready to run. An example of the state in which the vehicle is ready to run is the Ready-ON state.

[0044] If the control unit 22 determines that the vehicle is ready to run (Ready-ON) (step S307, Yes), the process proceeds to step S308. On the other hand, if the control unit 22 determines that the vehicle is not ready to run (Ready-OFF) (step S307, No), the process proceeds to step S309.

[0045] (Step S308) The control unit 22 of the power supply device 20, while keeping the system main relay 21 connected (SMR=ON), ends the pumping process for supplying power from the high-voltage battery 10 to the auxiliary battery 30, i.e., to at least the auxiliary loads that operate when the vehicle is in. When the control unit 22 ends the pumping process for the auxiliary loads that operate when the vehicle is in, the in-vehicle control ends.

[0046] (Step S309) The control unit 22 of the power supply device 20 determines whether the pumping process, which supplies power from the high-voltage battery 10 to the auxiliary battery 30, i.e., to the auxiliary loads that operate when the vehicle is in operation, has been performed continuously for a predetermined time. This determination is made to prevent the pumping process from being performed unnecessarily long before the vehicle is ready to drive, for example, due to prolonged opening and closing of the vehicle doors. Therefore, this predetermined time can be appropriately set based on, for example, regulations and vehicle specifications, taking into account the charge states of the high-voltage battery 10 and the auxiliary battery 30.

[0047] If the control unit 22 determines that the pumping process has been performed continuously for the predetermined time (step S309, Yes), the process proceeds to step S310. On the other hand, if the control unit 22 determines that the pumping process has not been performed continuously for the predetermined time (step S309, No), the process proceeds to step S307.

[0048] (Step S310) The control unit 22 of the power supply device 20 shuts off the system main relay 21 (SMR=OFF) and ends the pumping process for supplying power from the high-voltage battery 10 to the auxiliary battery 30, i.e., to the auxiliary loads that operate when the vehicle is in. When the control unit 22 shuts off the system main relay 21 and ends the pumping process for the auxiliary loads that operate when the vehicle is in, the in-vehicle control ends.

[0049] In this on-boarding control, if it is known before boarding that pumping processing will be required when boarding the vehicle, even if an instruction to enable the vehicle to run (Ready-ON) is given while the pumping processing is being performed prior to boarding the vehicle, the system main relay 21 is not switched from ON to OFF and then back ON again, but is instead kept ON and the vehicle transitions to a state where it can run. This reduces the number of times the system main relay 21 is operated.

[0050] (3) Application example of control when getting off Fig. 4 is a flowchart showing the processing procedure of an application example of the dismounting control executed by the control unit 22 of the power supply device 20 when the driver dismounts from the vehicle as described in Fig. 2. The application example of the dismounting control shown in Fig. 4 differs from the dismounting control shown in Fig. 2 in that the processing of step S401 is added after step S201.

[0051] In this application example of the vehicle dismounting control, if it is determined that there is an auxiliary load that will operate when the vehicle is dismounted (step S201, Yes), it is further determined whether or not the pumping request should be set to "Yes" based on the state of the auxiliary battery 30 (step S401). As an example, if the auxiliary battery 30 is fully charged (SOC: State of charge) and the power supply to the auxiliary load that will operate when the vehicle is dismounted can be supplied only by the power stored in the auxiliary battery 30, it is determined in step S401 that pumping is not required. This determination can reduce the number of times the system main relay 21 operates.

[0052] Furthermore, in step S401, a comprehensive determination may be made as to whether or not the pumping request should be set to "Yes" by further considering not only the state of the auxiliary battery 30 but also the state of the high-voltage battery 10, the total amount of power consumed by the auxiliary loads that operate when the vehicle is dismounted and / or mounted, and the operation timing of each auxiliary load. As an example, even if the state of charge (SOC) of the auxiliary battery 30 is fully charged, if the total amount of power consumed by the auxiliary loads that operate when the vehicle is dismounted is greater than a predetermined value (which can be set based on the performance and capacity of the auxiliary battery 30, etc.), it may be determined that pumping is necessary. This determination can prevent the auxiliary battery 30 from running out.

[0053] In addition, the control unit 22 of the power supply device 20 can acquire and calculate physical quantities (voltage value, current value, stored power amount, etc.) indicating the state of the high-voltage battery 10 and the auxiliary battery 30, for example, based on the detected values ​​of various sensors (not shown) such as voltage, current, temperature, etc., provided on the high-voltage battery 10 and the auxiliary battery 30.

[0054] <Actions and Effects> As described above, according to the power supply device 20 of one embodiment of the present disclosure, when the main switch is turned OFF (IG-OFF) while the system main relay 21 is ON when the vehicle is dismounted, if there is an auxiliary load (specific on-board equipment) among the multiple auxiliary loads 41 and 42 that use the auxiliary battery 30 as the main power source that will operate when the vehicle is dismounted after the main switch is turned OFF, pumping control is performed to supply power from the high-voltage battery 10 to the auxiliary load that will operate when the vehicle is dismounted, while keeping the system main relay 21 in the ON state.

[0055] Furthermore, according to the power supply device 20 of one embodiment of the present disclosure, when a driver is in the vehicle and a command (Ready-ON) is given to enable the vehicle to run while pumping control is being performed to supply power from the high-voltage battery 10 to auxiliary loads (specific on-board equipment) that operate when the driver is in the vehicle, control is performed to transition the vehicle to a state where it can run while maintaining the system main relay 21 in the ON state.

[0056] These controls can suppress an increase in the number of ON / OFF switching of the system main relay 21 that accompanies the execution of pumping control, and can reduce the impact on the life of the components of the system main relay 21.

[0057] The above describes one embodiment of the present disclosure, but the present disclosure can be understood as a power supply device, a control method executed by a control unit of the power supply device having a processor and a memory, a control program for executing the control method, a computer-readable non-transitory recording medium storing the control program, and a vehicle equipped with the power supply device. [Industrial Applicability]

[0058] The power supply device of the present disclosure can be used in vehicles equipped with auxiliary loads that may be activated when passengers get on and off the vehicle. [Explanation of symbols]

[0059] 10 High-voltage battery 20 Power supply 21 System Main Relay (SMR) 22 Control Unit 30 Auxiliary battery 41 Auxiliary load 42 Auxiliary load

Claims

1. A power supply device mounted on a vehicle, a relay provided between the high-voltage battery and one or more on-board devices; a control unit that controls the supply of power from the high-voltage battery to the one or more on-board devices by switching the relay ON / OFF based on the state of a main switch that operates a driving system of the vehicle, The control unit When the main switch is turned off while the relay is turned on, if there is a specific in-vehicle device among the one or more in-vehicle devices that will operate after the main switch is turned off, power is supplied from the high-voltage battery to the specific in-vehicle device while the relay is kept on, The power supply device turns off the relay when the state in which power is supplied from the high-voltage battery to the specific in-vehicle device continues for a predetermined time.

2. 2. The power supply device according to claim 1, wherein when a predetermined operation is performed on the vehicle while the relay is OFF and the specific in-vehicle equipment is present, the control unit turns the relay ON to supply power from the high-voltage battery to the specific in-vehicle equipment, and when the main switch is then turned ON, keeps the relay ON.

3. The power supply device according to claim 1 , wherein the control unit determines whether or not the specific in-vehicle device is present while the main switch is turned on.

4. 2. The power supply device according to claim 1, wherein the control unit determines whether the specific in-vehicle device is present based on the presence or absence of a request to supply power from the high-voltage battery to the specific in-vehicle device.

5. The power supply device according to claim 1 , wherein the specific in-vehicle device is a device that operates at least when the driver gets off or gets on the vehicle.

6. A control method executed by a computer for a power supply device mounted on a vehicle, the power supply device including a relay provided between a high-voltage battery and one or more on-board devices, comprising: determining the state of a main switch that operates a driving system of the vehicle; switching the relay ON / OFF based on the state of the main switch; a step of determining whether or not there is a specific in-vehicle device among the one or more in-vehicle devices that will operate after the main switch is turned off when the main switch is turned off while the relay is turned on; If there is a specific in-vehicle device that operates after the main switch is turned off, supplying power from the high-voltage battery to the specific in-vehicle device while maintaining the relay in an ON state; and turning off the relay when the state in which power is being supplied from the high-voltage battery to the specific in-vehicle device continues for a predetermined time.

7. A program to be executed by a computer of a power supply device mounted on a vehicle, the power supply device including a relay provided between a high-voltage battery and one or more on-board devices, determining the state of a main switch that operates a driving system of the vehicle; switching the relay ON / OFF based on the state of the main switch; a step of determining whether or not there is a specific in-vehicle device among the one or more in-vehicle devices that will operate after the main switch is turned off when the main switch is turned off while the relay is turned on; If there is a specific in-vehicle device that operates after the main switch is turned off, supplying power from the high-voltage battery to the specific in-vehicle device while maintaining the relay in an ON state; and turning off the relay when a state in which power is being supplied from the high-voltage battery to the specific in-vehicle device continues for a predetermined time.

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