Power control unit, power control method, and power control program

Abstract

To provide a power control unit capable of reducing deterioration of communication status, a power control method, and a power control program.SOLUTION: A power control unit in a present application includes a DC-DC converter and a controller. DC-DC converter is provided to a vehicle to control the charge of the power supply. The controller is configured so as to, when the remaining battery power falls below a threshold value, control the DC-DC converter to charge the power supply. The controller is configured so as to, when an onboard communications unit of the vehicle is active when the remaining charge falls below the threshold value, control the DC-DC converter to restrict the operation.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power supply control device, a power supply control method, and a power supply control program. [Background technology]

[0002] Conventionally, a system is known in which, when a first power source that supplies power to a load fails, a second power source supplies power instead of the first power source. In this system, a technology is disclosed in which, when the remaining charge of the second power source decreases, a DC-DC converter is operated to charge the second power source (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-184690 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in conventional technology, if a DCDC converter is operated while a communication device is being used near the DCDC converter, there is a risk that the communication status of the communication device may deteriorate due to the influence of noise generated by the DCDC converter.

[0005] The present application has been made in consideration of the above, and aims to provide a power supply control device, a power supply control method, and a power supply control program that can reduce deterioration of communication conditions. [Means for solving the problem]

[0006] The power supply control device according to the present application includes a DC-DC converter and a controller. The DC-DC converter is provided in a vehicle and controls charging of a power supply. When the remaining charge of the power supply falls below a threshold, the controller controls the DC-DC converter to charge the power supply. If a communication device mounted on the vehicle is operating when the remaining charge of the power supply falls below the threshold, the controller suppresses operation of the DC-DC converter. Effect of the Invention

[0007] According to one aspect of the embodiment, an effect is achieved in that deterioration of communication conditions can be reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram of the configuration and operation of a power supply control device according to the first embodiment. [Diagram 2] FIG. 2 is an explanatory diagram of the configuration and operation of the power supply control device according to the first embodiment. [Diagram 3] FIG. 3 is an explanatory diagram of the configuration and operation of the power supply control device according to the first embodiment. [Figure 4] FIG. 4 is an explanatory diagram of the configuration and operation of the power supply control device according to the first embodiment. [Diagram 5] FIG. 5 is an explanatory diagram showing an example of the operation of the power supply control device when charging the auxiliary power supply. [Figure 6A] FIG. 6A is a diagram for explaining charging control accompanying the use of a communication device. [Figure 6B] FIG. 6B is a diagram for explaining charging control accompanying the use of a communication device. [Figure 6C] FIG. 6C is a diagram for explaining charging control accompanying the use of a communication device. [Figure 7] FIG. 7 is a flowchart illustrating an example of a charging start process executed by the controller. [Figure 8] FIG. 8 is a flowchart illustrating an example of a charging end process executed by the controller. [Figure 9]FIG. 9 is an explanatory diagram of the configuration and operation of a power supply control device according to the second embodiment. [Figure 10] FIG. 10 is an explanatory diagram of the configuration and operation of a power supply control device according to the second embodiment. [Figure 11] FIG. 11 is an explanatory diagram of the configuration and operation of a power supply control device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of a power supply control device, a power supply control method, and a power supply control program will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the following embodiment. In the following, a case where a vehicle equipped with a power supply control device according to the embodiment is an electric vehicle or a hybrid vehicle will be described.

[0010] The vehicle in which the power supply control device according to the embodiment is installed may be an engine vehicle that runs on an internal combustion engine. The power supply control device according to the embodiment is a device that is installed in a vehicle with an automatic driving function and supplies power to a load.

[0011] [Power supply control device configuration] The configuration and operation of a power supply control device 1 according to the first embodiment will be described with reference to Fig. 1 to Fig. 4. Fig. 1 to Fig. 4 are explanatory diagrams of the configuration and operation of the power supply control device 1 according to the first embodiment. As shown in Fig. 1, the power supply control device 1 according to the embodiment is connected to a main power supply 10, a first load 101, a general load 102, a second load 103, an automatic driving control device 100, and a communication device 200.

[0012] The power supply control device 1 includes a first system 110 and a second system 120. The first system 110 is a power supply system that supplies power from a main power supply 10 to a first load 101 and a general load 102. The second system 120 is a power supply system that supplies power from an auxiliary power supply 20 (described later) to a second load 103.

[0013] The first load 101 includes a load for automatic driving. The first load 101 includes, for example, a steering motor, an electric brake device, an in-vehicle camera, etc. that operate during automatic driving. The general load 102 is a load that is not directly related to automatic driving, and includes a display, an air conditioner, an audio device, a video device, various lights, etc.

[0014] The second load 103 has some of the functions for automatic driving that the first load 101 has. The second load 103 includes, for example, a steering motor, an electric brake device, and a radar, which are minimum devices required for FOP (Fail Operation, evacuation drive control). The first load 101, the general load 102, and the second load 103 operate with power supplied from the power supply control device 1.

[0015] The automatic driving control device 100 is a device that controls automatic driving of a vehicle by operating a first load 101 and a second load 103. When a power supply failure such as a ground fault occurs in the first system 110 during automatic driving of the vehicle, the automatic driving control device 100 can implement FOP by the second load 103. Furthermore, when a power supply failure such as a ground fault occurs in the second system 120, the automatic driving control device 100 can implement FOP by the first load 101.

[0016] Specifically, when a power failure occurs during automatic driving, the automatic driving control device 100 performs evacuation driving control of the vehicle, drives the vehicle to a safe place and stops the vehicle. When the automatic driving control device 100 normally completes evacuation driving, it transmits an evacuation driving completion notification indicating that to the power supply control device 1.

[0017] The communication device 200 is, for example, a communication device mounted on a vehicle, and is a device that communicates with an external device wirelessly or by wire. The communication device 200 that communicates wirelessly is, for example, an audio device that wirelessly communicates with a terminal device to output music, a radio device, an ETC (Electronic Toll Collection System) device, etc. The communication device 200 that communicates by wire is a device that communicates by CAN (Controller Area Network) communication, which is an in-vehicle network, and is, for example, an external diagnostic tool device that performs fault diagnosis, a reprogramming device that reprograms a vehicle control device such as an ECU, etc. The communication device 200 outputs information on whether or not it is currently operating (communicating) to the controller 3. The communication device 200 may be configured as a general load 102 connected to the first system 110. When the communication device 200 is configured as the general load 102, the controller 3 may determine whether or not it is currently operating (communicating) based on the presence or absence of power supply to the general load 102.

[0018] The main 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 main power source 10 may be any secondary battery other than PbB 12. The main power source 10 is an example of a first power source.

[0019] The DC / DC 11 is connected to a generator and a high-voltage battery having a higher voltage than the PbB 12. The DC / DC 11 steps down the voltage of the generator and the high-voltage battery and outputs it to the first system 110. The generator is an alternator that converts the kinetic energy of a traveling vehicle into electricity to generate power. The high-voltage battery is a battery for driving the vehicle that is installed in an electric vehicle or a hybrid vehicle.

[0020] When the main power supply 10 is installed in an engine vehicle, an alternator (generator) is provided instead of the DC / DC 11. The DC / DC 11 charges the PbB 12, supplies power to a first load 101 and a general load 102, supplies power to a second load 103, and charges an auxiliary power supply 20, which will be described later.

[0021] The power supply control device 1 includes an auxiliary power supply 20, an inter-system switch 41, a battery switch 42, a bypass switch 43, a controller 3, a first voltage sensor 51, a second voltage sensor 52, and a DC-DC converter (DC / DC) 53. The auxiliary power supply 20 is a backup power supply in the event that the main power supply 10 is unable to supply power. The auxiliary power supply 20 includes a lithium ion battery (hereinafter referred to as "LiB21"). The battery of the auxiliary power supply 20 may be any secondary battery other than the LiB21. The auxiliary power supply 20 is an example of a second power supply.

[0022] The inter-system switch 41 is provided on an inter-system line 130 that connects the first system 110 and the second system 120. The inter-system switch 41 is an example of a connection unit that can connect and disconnect the first system 110 and the second system 120.

[0023] In this embodiment, electrically connecting the first system 110 and the second system 120 by the inter-system switch 41 is referred to as making the inter-system switch 41 conductive or turning on the inter-system switch 41.

[0024] In the present embodiment, the cutting of the electrical connection between the first system 110 and the second system 120 by the inter-system switch 41 is referred to as interrupting the inter-system switch 41 or turning off the inter-system switch 41.

[0025] The inter-system switch 41 may be a DC / DC converter. In this case, the DC / DC converter is controlled by the controller 3. The DC / DC converter electrically connects the first system 110 and the second system 120 by starting operation, and disconnects the electrical connection between the first system 110 and the second system 120 by stopping operation.

[0026] The battery switch 42 is a switch that connects the auxiliary power supply 20 to the second system 120. In the embodiment, electrically connecting the auxiliary power supply 20 and the second system 120 by the battery switch 42 is referred to as making the battery switch 42 conductive or turning on the battery switch 42.

[0027] In addition, in this embodiment, cutting the electrical connection between the auxiliary power supply 20 and the second system 120 by the battery switch 42 is referred to as interrupting the battery switch 42 or turning off the battery switch 42.

[0028] The bypass switch 43 is a switch that connects the battery switch 42 and the second system 120. The DC / DC 53 is connected in parallel with the bypass switch 43, and adjusts the voltage input to the LiB 21 during charging.

[0029] The first voltage sensor 51 is provided in the first system 110. The first voltage sensor 51 detects the voltage of the first system 110 and outputs the detection result to the controller 3. The second voltage sensor 52 is provided in the second system 120. The second voltage sensor 52 detects the voltage of the second system 120 and outputs the detection result to the controller 3.

[0030] The controller 3 includes a microcomputer having a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), etc., and various other circuits. The controller 3 may be configured with hardware such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

[0031] The controller 3 controls the operation of the power supply control device 1 by executing a program stored in the ROM by the CPU using the RAM as a work area. The controller 3 controls the inter-system switch 41, the battery switch 42, the bypass switch 43, and the DC / DCs 11 and 53.

[0032] Furthermore, the controller 3 acquires a state value indicating the charging state of the auxiliary power supply 20 from the auxiliary power supply 20 via the state monitoring line 22. The state value indicating the charging state of the auxiliary power supply 20 is, for example, the SOC (State Of Charge) of the LiB 21.

[0033] The LiB 21 is in a state where the remaining charge is maximum when the SOC is 100%. The LiB 21 is in a state where the remaining charge is zero when the SOC is 0%. The controller 3 acquires, for example, the SOC of the LiB 21 as a state value indicating the charging state of the auxiliary power supply 20. The controller 3 monitors the remaining charge of the auxiliary power supply 20 based on the SOC of the LiB 21.

[0034] Furthermore, the controller 3 detects a failure of the main power supply 10 or the auxiliary power supply 20 based on the detection results input from the first voltage sensor 51 and the second voltage sensor 52. For example, the controller 3 detects a failure of the first system 110 or the second system 120. A failure of the main power supply 10 includes a ground fault in the first system 110 and a disconnection of the first system 110. A failure of the auxiliary power supply 20 includes a ground fault in the second system 120. When the controller 3 detects a failure of the first system 110 or the second system 120, it notifies the automatic driving control device 100 of that fact.

[0035] Specifically, when the controller 3 detects a failure of the main power supply 10 or the auxiliary power supply 20, it outputs an automatic driving prohibition signal indicating that automatic driving is not possible to the automatic driving control device 100. In addition, when the controller 3 does not detect a failure of the main power supply 10 or the auxiliary power supply 20, it outputs an automatic driving permission signal indicating that automatic driving is possible to the automatic driving control device 100.

[0036] Furthermore, when the controller 3 detects a failure of the main power supply 10 or the auxiliary power supply 20, it stores diagnostic information indicating the failure in the non-volatile memory. Then, at the next startup, if the diagnostic information is stored in the non-volatile memory, the controller 3 prohibits the automatic driving by the automatic driving control device 100.

[0037] Specifically, the controller 3 prohibits the automatic driving control device 100 from performing automatic driving by outputting an automatic driving prohibition signal indicating that automatic driving is not possible to the automatic driving control device 100. This makes it possible for the power supply control device 1 to prevent the automatic driving control device 100 from erroneously performing automatic driving even if the failure of the main power supply 10 or the auxiliary power supply 20 has not been resolved at the next startup after the evacuation travel is completed.

[0038] [Normal operation of the power supply control device] The controller 3, during normal times when neither the main power supply 10 nor the auxiliary power supply 20 has a failure, controls the system-to-system switch 41, the battery switch 42, and the bypass switch 43 as shown in Fig. 1. Specifically, the controller 3 turns off the battery switch 42 and the bypass switch 43, and turns on the system-to-system switch 41. This allows power to be supplied from the main power supply 10 to the first load 101, the general load 102, and the second load 103. During normal times when neither the main power supply 10 nor the auxiliary power supply 20 has a failure, the controller 3 outputs an automatic operation permission signal to the automatic operation control device 100.

[0039] [Power supply control device operation when power supply fails] Next, the operation of the power supply control device 1 when a power failure occurs will be described with reference to Figures 2 to 4. The controller 3 detects the occurrence of a power failure by comparing a parameter related to a failure of the first system 110 or the second system 120 with a threshold value.

[0040] Here, a case will be described in which the parameter related to a failure of the main power supply 10 is the voltage of the first system 110, and the parameter related to a failure of the auxiliary power supply 20 is the voltage of the second system 120. Hereinafter, the voltage of the first system 110 detected by the first voltage sensor 51 will be referred to as a first system voltage V1. Also, the voltage of the second system 120 detected by the second voltage sensor 52 will be referred to as a second system voltage V2.

[0041] The parameter related to the failure of the main power supply 10 may be the current flowing through the first system 110 or the current flowing through the second system 120. In this case, the power supply control device 1 includes a current sensor that detects the current flowing through the first system 110 and a current sensor that detects the current flowing through the second system 120. Then, the controller 3 detects the occurrence of a ground fault when the current flowing through the first system 110 or the current flowing through the second system 120 exceeds an overcurrent threshold.

[0042] 2, in the power supply control device 1, for example, when a ground fault 200 occurs in the first system 110 or when a ground fault 201 occurs in the second system 120, an overcurrent flows toward the ground fault point. As a result, the first system voltage V1 and the second system voltage V2 become equal to or lower than the ground fault threshold value.

[0043] When the first system voltage V1 and the second system voltage V2 become equal to or lower than the ground fault threshold value, the controller 3 provisionally determines that the ground fault 200 or the ground fault 201 has occurred in the first system 110 or the second system 120. After that, the controller 3 outputs an automatic driving prohibition signal to the automatic driving control device 100.

[0044] Then, when the controller 3 provisionally determines that a ground fault 200 or 201 has occurred, it turns off the inter-system switch 41 and turns on the battery switch 42 and the bypass switch 43. This disconnects the first system 110 and the second system 120, so that power is supplied from the main power supply 10 to the first system 110 and power is supplied from the auxiliary power supply 20 to the second system 120. Hereinafter, the shutoff of the inter-system switch 41 based on the result of the provisional determination is also referred to as pre-shutoff.

[0045] Furthermore, the controller 3 can tentatively determine that a ground fault has occurred in the first system 110 or the second system 120 when at least one of the first system voltage V1 and the second system voltage V2 becomes equal to or lower than a ground fault threshold value.

[0046] This provisional determination may be made by a hardware circuit having a comparator. In this case, the comparator compares the second system voltage V2 with the ground fault threshold. When the detected voltage becomes equal to or lower than the ground fault threshold, the comparator outputs a failure detection signal indicating a provisional determination, thereby turning off the inter-system switch 41 and turning on the battery switch 42 and the bypass switch 43. After provisionally determining that a ground fault has occurred in the first system 110 or the second system 120, the controller 3 makes a final determination of the ground fault.

[0047] When the controller 3 turns off the inter-system switch 41 and turns on the battery switch 42 and the bypass switch 43, the system voltage of the system where no ground fault has occurred returns to a normal state, and the system voltage of the system where a ground fault has occurred continues to decrease.

[0048] Therefore, if the first system voltage V1 is equal to or lower than the ground fault threshold for a predetermined period or more after the pre-shutdown and the second system voltage V2 is restored to equal to or higher than the normal threshold which is higher than the ground fault threshold for a predetermined period or more, the controller 3 determines that the second system 120 is normal and that the ground fault 200 has occurred in the first system 110. The predetermined period here is, for example, 100 ms. Note that the predetermined period is not limited to 100 ms. The normal threshold is a value higher than the ground fault threshold.

[0049] When the controller 3 determines that a ground fault 200 has occurred in the first system 110, it performs fail-safe control to supply power from the auxiliary power supply 20 to the second load 103 as shown in Fig. 3, and notifies the automatic driving control device 100 of the result. As a result, the automatic driving control device 100 can operate the second load 103 with power supplied from the auxiliary power supply 20, and can evacuate the vehicle to a safe place and stop the vehicle. The fail-safe control may also include shutting off the inter-system switch 41 and turning on the battery switch 42 based on a provisional determination, and notifying the automatic driving control device 100 of the result of the actual determination.

[0050] In addition, after the pre-shutdown, if the first system voltage V1 returns to being above the normal threshold for a predetermined period of time or more and the second system voltage V2 is below the ground fault threshold for a predetermined period of time or more, the controller 3 makes a final determination that the first system 110 is normal and that a ground fault 201 has occurred in the second system 120.

[0051] When the controller 3 determines that a ground fault 201 has occurred in the second system 120, as shown in Fig. 4, it performs fail-safe control by turning off the battery switch 42 and supplying power from the main power supply 10 to the first load 101 and the general load 102. Then, the controller 3 notifies the automatic driving control device 100 of this fact. As a result, the automatic driving control device 100 can operate the first load 101 using power supplied from the main power supply 10, and can evacuate the vehicle to a safe place and stop the vehicle.

[0052] Furthermore, if both the first system voltage V1 and the second system voltage V2 continue to be at or above the normal threshold for a predetermined period or more after the pre-shutdown, the controller 3 determines that the voltage drop is a temporary voltage drop and that no ground faults 200, 201 have occurred. In other words, the controller 3 determines that both the first system 110 and the second system 120 are normal.

[0053] In this case, the controller 3 turns off the battery switch 42 from the pre-shutdown state shown in Fig. 2, turns on the inter-system switch 41, and restores the normal operation state of Fig. 1. This allows the controller 3 to suppress a decrease in the amount of stored power in the auxiliary power supply 20.

[0054] [Operation when charging auxiliary power supply] Next, a charging operation in which the controller 3 of the power supply control device 1 charges the auxiliary power supply 20 will be described with reference to Fig. 5. Fig. 5 is an explanatory diagram showing an example of the operation of the power supply control device 1 when charging the auxiliary power supply 20. When the remaining charge (SOC) of the auxiliary power supply 20 is less than a threshold, the controller 3 turns on the inter-system switch 41 and the battery switch 42 and cuts off the bypass switch 43. As a result, the controller 3 supplies power from the main power supply 10 via the DC / DC 53 to the auxiliary power supply 20 to charge the auxiliary power supply 20.

[0055] Here, if the communication device 200 mounted on the vehicle is being used when charging the auxiliary power supply 20, the communication device 200 may be affected by noise generated by the operation of the DC / DC 53, resulting in a deterioration in the communication conditions.

[0056] Therefore, in the present disclosure, the implementation of charging control is suppressed when the communication device 200 is in use. Specifically, the controller 3 suppresses the operation of the DC / DC 53 if the communication device 200 is in operation when the remaining charge amount of the auxiliary power source 20 falls below the threshold.

[0057] Here, charging control accompanying use of communications device 200 will be described with reference to Fig. 6A to Fig. 6C. Fig. 6A to Fig. 6C are diagrams for explaining charging control accompanying use of communications device 200. Fig. 6A shows charging control when communications device 200 is not in use, and Fig. 6B and Fig. 6C show charging control when communications device 200 is in use.

[0058] As shown in FIG. 6A, when the remaining charge level of the LiB 21 is less than a first threshold TH1 (e.g., 60%) at which charging should start, and when the communication device 200 is not in use (not communicating), the controller 3 operates the DC / DC 53 to start charging the LiB 21.

[0059] On the other hand, as shown in Fig. 6B, when the remaining charge of the LiB 21 is less than the first threshold TH1 and the communications device 200 is in use, the controller 3 turns off the battery switch 42 and stops the DC / DC 53. That is, the controller 3 prohibits the implementation of charging control. Note that, when the remaining charge of the LiB 21 is less than the first threshold TH1 and use of the communications device 200 is terminated, the controller 3 immediately turns on the battery switch 42 and operates the DC / DC 53 to start charging the LiB 21.

[0060] 6C, even when the communications device 200 is in use, if the remaining charge of the LiB 21 falls below a second threshold TH2 (e.g., 40%) that is lower than the first threshold TH1, the controller 3 turns on the battery switch 42 and operates the DC / DC 53 to forcibly start charging the LiB 21. That is, when the communications device 200 is in use, the controller 3 sets the threshold for starting charging to the second threshold TH2 lower than the first threshold TH1. The second threshold TH2 is a threshold for the remaining charge that allows the LiB 21 to back up the main power source 10, and more specifically, is a threshold for the remaining charge that allows fail-safe control by power supply from the LiB 21.

[0061] In this way, the power supply control device 1 suppresses the operation of the DC / DC 53 (prohibits operation or lowers the threshold for starting charging) when the communications device 200 is in use. This reduces the number of situations in which charging control is performed while the communications device 200 is in use, thereby reducing noise generated by the DC / DC 53 and reducing deterioration of the communication state. Furthermore, by lowering the threshold for starting charging, the controller 3 can reduce the influence of noise from the DC / DC 53 and can also perform charging in preparation for the case in which power from the LiB 20 is required.

[0062] Furthermore, the controller 3 may also change the threshold of the remaining charge amount at which charging ends depending on whether the communications device 200 is in use or not. For example, when the communications device 200 is not in use, the controller 3 charges the communications device 200 up to a first charging end threshold (e.g., 80%). On the other hand, when the communications device 200 is in use, the controller 3 charges the communications device 200 up to a second charging end threshold (e.g., 60%) that is lower than the first charging end threshold. In other words, when the communications device 200 is in use, the controller 3 sets the charging end threshold lower than when the communications device 200 is not in use. This makes it possible to shorten the charging time when the communications device 200 is in use, thereby reducing the generation of noise by the DC / DC 53 and reducing deterioration of the communication state.

[0063] 6C, if there is no plan to perform autonomous driving while the vehicle is running, the controller 3 may prohibit charging control even if the remaining amount of stored power becomes less than the second threshold TH2. Specifically, the controller 3 accepts in advance from the driver of the vehicle an intention as to whether or not to perform autonomous driving, and if there is no intention to perform autonomous driving, prohibits charging control even if the remaining amount of stored power becomes less than the second threshold TH2. The intention as to whether or not to perform autonomous driving can be accepted, for example, by operating a dedicated operation unit (button) provided in the vehicle, an operation to instruct prohibition of use of the autonomous driving function, an operation via an in-vehicle device such as a navigation device, or the like.

[0064] In this way, the controller 3 prohibits the charging control when there is no plan to perform the automatic driving, thereby making it possible to reduce the generation of noise by the DC / DC 53 and to reduce the deterioration of the communication state.

[0065] Next, the process executed by the controller 3 will be described with reference to Fig. 7 and Fig. 8. Fig. 7 is a flowchart showing an example of a charge start process executed by the controller 3. Fig. 8 is a flowchart showing an example of a charge end process executed by the controller 3. The process shown in Fig. 7 and Fig. 8 is repeatedly executed from when the ignition switch (IG) of the vehicle is turned on until it is turned off.

[0066] As shown in FIG. 7, the controller 3 first determines whether or not the remaining amount of stored electricity in the LiB 21 is less than a first threshold value TH1 (step S101).

[0067] When the remaining amount of stored power of the LiB 21 is less than the first threshold TH1 (step S101: Yes), the controller 3 determines whether the communications device 200 is in use (step S102).

[0068] If the communications device 200 is in use (step S102: Yes), the controller 3 turns off the battery switch 42 and the bypass switch 43, and stops the DC / DC 53 (step S103). That is, the controller 3 does not charge the LiB 21.

[0069] Next, the controller 3 determines whether the remaining charge amount of the LiB 21 is less than the second threshold value TH2 (step S104). If the remaining charge amount of the LiB 21 is less than the second threshold value TH2 (step S104: Yes), the controller 3 determines whether the driver has an intention to drive autonomously (step S105).

[0070] If the driver intends to drive automatically (step S105: Yes), the controller 3 connects the battery switch 42, cuts off the bypass switch 43, and activates the DC / DC 53 (step S106), and ends the charging start process. That is, the controller 3 starts charging the LiB 21.

[0071] On the other hand, in step S101, if the remaining charge amount of the LiB 21 is equal to or greater than the first threshold value TH1 (step S101: No), the controller 3 ends the charging start process. That is, the controller 3 does not start charging the LiB 21.

[0072] Furthermore, in step S102, if the communications device 200 is not in use (step S102: No), the controller 3 connects the battery switch 42, cuts off the bypass switch 43, and activates the DC / DC 53 (step S106), and ends the charging start process. That is, the controller 3 starts charging the LiB 21.

[0073] Furthermore, in step S104, if the remaining amount of stored electricity of the LiB 21 is equal to or greater than the second threshold value TH2 (step S104: No), the controller 3 returns to step S102.

[0074] In addition, in step S105, if the driver does not intend to drive the vehicle autonomously (step S105: No), the controller 3 ends the process. That is, the controller 3 does not start charging the LiB 21.

[0075] Next, the charging end process will be described with reference to Fig. 8. As shown in Fig. 8, the controller 3 determines whether the communications device 200 is in use (step S201). If the communications device 200 is not in use (step S201: No), the controller 3 sets the first charging end threshold (step S202). On the other hand, if the communications device 200 is in use (step S201: Yes), the controller 3 sets the second charging end threshold, which is lower than the first charging end threshold (step S203).

[0076] Next, the controller 3 determines whether the current remaining charge of the LiB 21 being charged has reached a set charging end threshold (first charging end threshold or second charging end threshold) (step S204). If the charging end threshold has been reached (step S204: Yes), the controller 3 turns off the battery switch 42 and the bypass switch 43, stops the operation of the DC / DC 53 (step S205), and ends the charging end process. That is, the controller 3 ends the charging of the LiB 21.

[0077] On the other hand, in step S204, if the charge end threshold has not been reached (step S204: No), the controller 3 returns to step S201.

[0078] As described above, the power supply control device 1 according to the first embodiment includes the DC / DC 53 and the controller 3. The DC / DC 53 controls charging of the second power supply (auxiliary power supply 20) that supplements the first power supply (main power supply 10). When the remaining charge of the second power supply falls below a threshold, the controller 3 controls the DC / DC 53 to charge the second power supply. If the communication device 200 is operating when the remaining charge of the second power supply falls below the threshold, the controller 3 suppresses operation of the DC / DC 53.

[0079] As a result, the power supply control device 1 suppresses the operation of the DC / DC 53 (prohibits operation or lowers the threshold for starting charging) when the communications device 200 is in use. This reduces the number of situations in which charging control is performed while the communications device 200 is in use, thereby reducing noise generated by the DC / DC 53 and reducing deterioration of the communication state.

[0080] The second embodiment will be described with reference to FIGS.

[0081] 9 to 11 are explanatory diagrams of the configuration and operation of a power supply control device according to the second embodiment. The second embodiment differs mainly in that it does not include the inter-system switch 41 of the first embodiment described above.

[0082] As shown in FIG. 9, the power supply control system S according to the second embodiment includes a power supply control device 1, a main power supply 10, an auxiliary power supply 20, a DC / DC 60, a bypass switch 70, first to fourth loads 111 to 114, and first to sixth voltage sensors 61 to 66. The power supply control device 1 includes a first system 110 and a second system 120. The first system 110 is a power supply system that supplies power from the main power supply 10 to the first to fourth loads 111 to 114. The second system 120 is a power supply system that supplies power from the auxiliary power supply 20 to the first to fourth loads 111 to 114. Note that the main power supply 10 and the auxiliary power supply 20 have the same configuration as in the first embodiment, and therefore will not be described below.

[0083] The first to fourth loads 111 to 114 are loads including various electronic devices mounted on a vehicle, and correspond to the first load 101, the general load 102, and the second load 103 in the first embodiment.

[0084] The main power supply 10 is electrically connected to the power supply control device 1 via a first power supply line L1. The auxiliary power supply 20 is electrically connected to the power supply control device 1 via a second power supply line L2. The first to fourth loads 111 to 114 are electrically connected to the power supply control device 1 via a load power supply line L3.

[0085] The first power supply line L1 is provided with a first voltage sensor 61 that measures the output voltage of the main power supply 10. The second power supply line L2 is provided with a DC / DC 60 that is a converter that steps down (or steps up) the input or output voltage of the auxiliary power supply 20, a bypass switch 70 that is connected in parallel to the DC / DC 60, and a second voltage sensor 62 that measures the output voltage of the auxiliary power supply 20 (the output voltage of the DC / DC 60). The detailed operations of the DC / DC 60 and the bypass switch 70 will be described later.

[0086] The power supply control device 1 is a device that supplies power input from a main power supply 10 or an auxiliary power supply 20 to first to fourth loads 111 to 114. The power supply control device 1 includes a common power supply line L4, first to sixth switches 44 to 49, and a controller 3. The common power supply line L4 is a power supply line that electrically connects the first power supply line L1, the second power supply line L2, and the load power supply line L3.

[0087] The first switch 44 is a switch that connects the first power supply line L1 and the common power supply line L4. When the first switch 44 is turned on, the first power supply line L1 and the common power supply line L4 are electrically connected. When the first switch 44 is turned off, the first switch 44 cuts off the electrical connection between the first power supply line L1 and the common power supply line L4.

[0088] The second switch 45 is a switch that connects the second power feed line L2 and the common power feed line L4. When the second switch 45 is turned on, the second power feed line L2 and the common power feed line L4 are electrically connected. When the second switch 45 is turned off, the second switch 45 cuts off the electrical connection between the second power feed line L2 and the common power feed line L4.

[0089] The third to sixth switches 46 to 49 are switches that connect the load power supply line L3 and the common power supply line L4. Specifically, the third switch 46, when turned on, electrically connects the common power supply line L4 and the first load 111. Moreover, the third switch 46, when turned off, cuts off the electrical connection between the common power supply line L4 and the first load 111.

[0090] The fourth switch 47, when turned on, electrically connects the common power supply line L4 and the second load 112. In addition, the fourth switch 47, when turned off, electrically disconnects the common power supply line L4 and the second load 112.

[0091] The fifth switch 48, when turned on, electrically connects the common power supply line L4 and the third load 113. In addition, the fifth switch 48, when turned off, electrically disconnects the common power supply line L4 and the third load 113.

[0092] The sixth switch 49, when turned on, electrically connects the common power supply line L4 and the fourth load 114. In addition, the sixth switch 49, when turned off, electrically disconnects the common power supply line L4 and the fourth load 114.

[0093] The first voltage sensor 61 is provided on the first power supply line L1 and detects the power supply state. Here, the first voltage sensor 61 is a voltage sensor that detects the voltage of the first power supply line L1 (the voltage of the main power supply 10). The first voltage sensor 61 outputs the voltage detection result to the controller 3. Note that the first voltage sensor 61 may be a current detection sensor that detects the current of the first power supply line L1. In this case, the first voltage sensor 61 outputs the current detection result to the controller 3.

[0094] The second voltage sensor 62 is provided on the second power supply line L2 and detects the power supply state. Here, the second voltage sensor 62 is a voltage sensor that detects the voltage of the second power supply line L2 (the voltage of the auxiliary power supply 20). The second voltage sensor 62 outputs the voltage detection result to the controller 3. Note that the second voltage sensor 62 may be a current detection sensor that detects the current of the second power supply line L2. In this case, the second voltage sensor 62 outputs the current detection result to the controller 3.

[0095] The third voltage sensor 63 is provided on the load power supply line L3 between the third switch 46 and the first load 111, and detects the power supply state. Here, the third voltage sensor 63 is a voltage sensor that detects the voltage of the load power supply line L3 between the third switch 46 and the first load 111. The third voltage sensor 63 outputs the voltage detection result to the controller 3. Note that the third voltage sensor 63 may be a current detection sensor that detects the current of the load power supply line L3 between the third switch 46 and the first load 111. In this case, the third voltage sensor 63 outputs the current detection result to the controller 3.

[0096] The fourth voltage sensor 64 is provided on the load power supply line L3 between the fourth switch 47 and the second load 112, and detects the power supply state. Here, the fourth voltage sensor 64 is a voltage sensor that detects the voltage of the load power supply line L3 between the fourth switch 47 and the second load 112. The fourth voltage sensor 64 outputs the voltage detection result to the controller 3. Note that the fourth voltage sensor 64 may be a current detection sensor that detects the current of the load power supply line L3 between the fourth switch 47 and the second load 112. In this case, the fourth voltage sensor 64 outputs the current detection result to the controller 3.

[0097] The fifth voltage sensor 65 is provided on the load power supply line L3 between the fifth switch 48 and the third load 113, and detects the power supply state. Here, the fifth voltage sensor 65 is a voltage sensor that detects the voltage of the load power supply line L3 between the fifth switch 48 and the third load 113. The fifth voltage sensor 65 outputs the voltage detection result to the controller 3. Note that the fifth voltage sensor 65 may be a current detection sensor that detects the current of the load power supply line L3 between the fifth switch 48 and the third load 113. In this case, the fifth voltage sensor 65 outputs the current detection result to the controller 3.

[0098] The sixth voltage sensor 66 is provided on the load power supply line L3 between the sixth switch 49 and the fourth load 114, and detects the power supply state. Here, the sixth voltage sensor 66 is a voltage sensor that detects the voltage of the load power supply line L3 between the sixth switch 49 and the fourth load 114. The sixth voltage sensor 66 outputs the voltage detection result to the controller 3. Note that the sixth voltage sensor 66 may be a current detection sensor that detects the current of the load power supply line L3 between the sixth switch 49 and the fourth load 114. In this case, the sixth voltage sensor 66 outputs the current detection result to the controller 3.

[0099] The controller 3 controls the conduction and interruption of the first to sixth switches 44 to 49, and also controls the DCDC 60. The controller 3 compares a detected voltage by any one of the voltage sensors 61 to 66 (for example, the first voltage sensor 61) with a ground fault threshold, and detects a ground fault if the detected voltage is equal to or lower than the ground fault threshold. When the controller 3 detects a ground fault, it identifies the location of the ground fault (any of the lines L1 to L3) while turning off the first to sixth switches 44 to 49 one by one in a predetermined order, and turns off the switch connected to the location of the ground fault.

[0100] Specifically, when the controller 3 detects a ground fault and first turns off the first switch 44, if the detected voltage of the first voltage sensor 61 is equal to or lower than the ground fault threshold, it can be determined that the first power supply line L1 is the location of the ground fault. On the other hand, if the detected voltage of the first voltage sensor 61 recovers to equal to or higher than the ground fault threshold, it can be determined that no ground fault has occurred in the first power supply line L1 and that the first power supply line L1 is normal.

[0101] Furthermore, when the controller 3 detects a ground fault and turns off the second switch 45, if the detected voltage of the second voltage sensor 62 is equal to or lower than the ground fault threshold, it can be determined that the second power supply line L2 is the location of the ground fault. On the other hand, if the detected voltage of the second voltage sensor 62 recovers to equal to or higher than the ground fault threshold, it can be determined that no ground fault has occurred in the second power supply line L2 and that the second power supply line L2 is normal.

[0102] In this way, the controller 3 sequentially turns off the first switch 44 and the second switch 45, and checks the detected voltages of the first voltage sensor 61 and the second voltage sensor 62 to determine whether a ground fault has occurred in the first power supply line L1 or the second power supply line L2.

[0103] Furthermore, when the controller 3 determines that both the first power supply line L1 and the second power supply line L2 are normal, the controller 3 determines that a ground fault has occurred in the load power supply line L3. In this case, the controller 3 sequentially turns off the third switch 46 to the sixth switch 49 connected to the first load 111 to the fourth load 114. If the detected voltage of the first voltage sensor 61 recovers to a ground fault threshold or higher when a certain switch is turned off, the controller 3 determines that a ground fault has occurred in the load power supply line L3 connected to that switch.

[0104] In this way, when the controller 3 detects a ground fault, it sequentially turns off the first switch 44 to the sixth switch 49, and identifies the location of the ground fault by checking the detected voltage of the first voltage sensor 61 or the second voltage sensor 62. When the controller 3 identifies the location of the ground fault, it disconnects the ground fault location from the circuit by turning off the switch connected to the ground fault location, and performs fail-safe control using the power supply and load of a normal system.

[0105] Among the first voltage sensor 61 to the sixth voltage sensor 66, the third voltage sensor 63 to the sixth voltage sensor 66 may be omitted, and instead one voltage sensor may be provided on the common power supply line L4. In this case, the power supply control device 1 can identify the load power supply line L3 in which a ground fault has occurred by sequentially turning off the third switch 46 to the sixth switch 49 and monitoring the voltage value detected by the voltage sensor provided on the common power supply line L4.

[0106] Next, an example of the operation of the power supply control device 1 according to the second embodiment will be described with reference to FIGS.

[0107] 9 shows an example of operation when power is supplied from the main power supply 10 or the auxiliary power supply 20 to the first to fourth loads 111 to 114. When supplying power to the first to fourth loads 111 to 114, the controller 3 turns on the first to sixth switches 44 to 49. The controller 3 also stops operation with the DC / DC 60 turned off, and turns on the bypass switch 70. As a result, power is supplied from the main power supply 10 or the auxiliary power supply 20 to the first to fourth loads 111 to 114.

[0108] Specifically, when the voltage of the main power supply 10 is higher than that of the auxiliary power supply 20, the power output from the main power supply 10 is supplied to the first to fourth loads 111 to 114 via the first switch 44, the common power supply line L4, the third to sixth switches 46 to 49, and the load power supply line L3. When the voltage of the main power supply 10 becomes lower than that of the auxiliary power supply 20, the power output from the auxiliary power supply 20 is supplied to the first to fourth loads 111 to 114 via the bypass switch 70, the second switch 45, the common power supply line L4, the third to sixth switches 46 to 49, and the load power supply line L3. This allows power to be supplied to the first to fourth loads 111 to 114 from the power supply with the higher voltage of the main power supply 10 or the auxiliary power supply 20, and also stops the operation of the DC / DC 60, thereby reducing noise generated by the operation of the DC / DC 60.

[0109] In addition, when a power supply failure such as a ground fault occurs in the first power supply line L1, the power supply control device 1 is unable to supply power from the main power supply 10, so supplies power from the auxiliary power supply 20 to the first to fourth loads 111 to 114 via the bypass switch 70.

[0110] In this case, the controller 3 turns off only the first switch 44 from a state in which the first to sixth switches 44 to 49 are on. The controller 3 also turns off the operation of the DC / DC 60 and turns on the bypass switch 70. As a result, the power output from the auxiliary power supply 20 is supplied to the first to fourth loads 111 to 114 via the bypass switch 70, the second switch 45, the common power supply line L4, the third to sixth switches 46 to 49, and the load power supply line L3.

[0111] In addition, when a power supply failure such as a ground fault occurs in the second power supply line L2, the power supply control device 1 continues power supply from the main power supply 10 to the first to fourth loads 111 to 114 while suppressing discharge from the main power supply 10 to the auxiliary power supply 20.

[0112] In this case, the controller 3 turns off only the second switch 45 from a state in which the first to sixth switches 44 to 49 are turned on. As a result, the power output from the main power supply 10 is not discharged to the auxiliary power supply 20, but is continuously supplied to the first to fourth loads 111 to 114 via the first switch 44, the common power supply line L4, the third to sixth switches 46 to 49, and the load power supply line L3.

[0113] In addition, when a power supply failure such as a ground fault occurs in the load power supply line L3, the power supply control device 1 disconnects the load power supply line L3 in which the power supply failure has occurred from the common power supply line L4, and continues power supply through the load power supply line L3 in which the power supply failure has not occurred.

[0114] For example, when a ground fault occurs in the load power supply line L3 connecting the first load 111 and the common power supply line L4, the controller 3 turns off the third switch 46 from a state in which the first to sixth switches 44 to 49 are on. This enables the controller 3 to disconnect the load power supply line L3 in which the ground fault has occurred from the common power supply line L4.

[0115] As a result, the power output from the main power supply 10 is continuously supplied to the second to fourth loads 112 to 114 via the first switch 44, the common power supply line L4, the fourth to sixth switches 47 to 49, and the load power supply line L3.

[0116] Next, the operation when charging auxiliary power supply 20 will be described with reference to Figures 10 and 11. Note that Figure 10 shows a case where communication device 200 is not in use, and Figure 11 shows a case where communication device 200 is in use.

[0117] As shown in FIG. 10 , when the SOC of the auxiliary power supply 20 is below a threshold value and the communication device 200 is unused, the controller 3 operates the DC / DC 60 and turns off the bypass switch 70, thereby supplying power from the main power supply 10 to the auxiliary power supply 20 and charging the auxiliary power supply 20.

[0118] Here, the operation of the DC / DC 60 differs depending on the magnitude relationship between the rated voltages (or the voltages when fully charged) of the main power supply 10 and the auxiliary power supply 20.

[0119] For example, when the main power supply 10 has a higher rated voltage than the auxiliary power supply 20, the controller 3 uses the DC / DC converter 60 to step down the output voltage of the main power supply 10 to the rated voltage of the auxiliary power supply 20. This makes it possible to prevent an overcurrent from flowing from the main power supply 10 to the auxiliary power supply 20, causing the auxiliary power supply 20 to break down.

[0120] On the other hand, when the auxiliary power supply 20 has a higher rated voltage than the main power supply 10, the controller 3 uses the DC / DC converter 60 to boost the output voltage of the main power supply 10 to the rated voltage of the auxiliary power supply 20. This makes it possible to charge the auxiliary power supply 20 from the main power supply 10.

[0121] In this way, when the communications device 200 is not in use, the controller 3 operates the DC / DC 60 to charge the device, thereby making it possible to prevent noise generated by the DC / DC 60 from affecting the communications device 200.

[0122] 11, when the SOC of the auxiliary power supply 20 is below a threshold (less than the first threshold TH1 and equal to or greater than the second threshold TH2 shown in FIG. 6B), if the communications device 200 is in use, the controller 3 stops the DC / DC 60 and turns off the bypass switch 70, thereby stopping the power supply from the main power supply 10 to the auxiliary power supply 20 and prohibiting charging of the auxiliary power supply 20. This makes it possible to reduce noise generated from the DC / DC 60 in the communications device 200 that is in use, thereby reducing deterioration of the communication state of the communications device 200.

[0123] If the SOC of the auxiliary power supply 20 is below a threshold (below the first threshold TH1 and equal to or greater than the second threshold TH2 shown in FIG. 6B), and the communication device 200 is in use, the controller 3 may stop the DC / DC 60 with the bypass switch 70 turned on. In this case, the auxiliary power supply 20 is charged naturally from the main power supply 10, so charging takes time, but since the DC / DC 60 is stopped, no noise is generated from the DC / DC 60. This makes it possible to reduce deterioration of the communication state of the communication device 200 while charging the auxiliary power supply 20.

[0124] Furthermore, when the remaining charge falls below a second threshold TH2, which is a threshold for the amount of stored power at which the LiB 21 can back up the main power supply 10, the controller 3 operates the DC / DC 60 and turns off the bypass switch 70, even if the communication device 200 is in use, to forcibly start charging the auxiliary power supply 200. This makes it possible to avoid a situation in which the auxiliary power supply 20 cannot back up the main power supply 10.

[0125] The timing at which charging of auxiliary power supply 20 ends is the same as in the first embodiment, and therefore a description thereof will be omitted.

[0126] Also, the charging control shown in the first and second embodiments may be performed only when communication is performed under specific conditions, and may exclude communication that is always performed at a fixed cycle. For example, in communication between ECUs using CAN communication, the controller 3 charges the auxiliary power supply 20 without stopping the operation of the DC / DC 60 because communication is always performed at a fixed cycle, such as for sensor information, in this case. On the other hand, when the controller 3 communicates with an ECU upon a request from an outside source, such as a remote diagnostic system, the controller 3 stops the operation of the DC / DC 60. This is because noise countermeasures are often implemented in communication between ECUs using CAN communication, and the DC / DC 60 has high resistance to noise. In this way, by determining whether the DC / DC 60 can be operated depending on the communication content of the communication device 200, it is possible to avoid charging the auxiliary power supply 20 from being stopped more than necessary.

[0127] [Note] As an appendix, the features of the present invention are as follows: (1) A DC-DC converter that is installed in a vehicle and controls charging of the power source; A controller that controls the DC-DC converter to charge the power source when the remaining charge of the power source falls below a threshold value, The controller: When the remaining charge of the power source falls below a threshold, if a communication device mounted on the vehicle is in operation, the operation of the DC-DC converter is suppressed. Power control device. (2) The controller: The operation of the DC-DC converter is suppressed by stopping the DC-DC converter. A power supply control device as described in (1). (3) The controller: When the communication device is not in operation, when the remaining charge of the power source becomes less than a first threshold, the DC-DC converter is controlled to charge the power source; When the communication device is in operation, if the remaining charge of the power source falls below a second threshold value that is lower than the first threshold value, the DC-DC converter is controlled to charge the power source, thereby suppressing operation of the DC-DC converter. A power supply control device according to (1) or (2). (4) The controller: When the communication device is not in operation, charging the second power source until the remaining charge of the second power source reaches a first charge end threshold; When the communication device is in operation, the second power source is charged until a remaining amount of stored power of the second power source becomes a second charge end threshold value that is lower than the first charge end threshold value, thereby suppressing operation of the DC-DC converter. The power supply control device according to any one of (1) to (3). (5) The first power source is a power source that supplies power to a load related to automatic driving of a vehicle, The controller: The system accepts an intention to perform the automatic driving from the driver in advance, and when the driver does not intend to perform the automatic driving, stops the DC-DC converter to suppress the operation of the DC-DC converter. The power supply control device according to any one of (1) to (4). (6) A power supply control device provided in a vehicle and having a controller that controls charging of a power supply, The controller: When the device mounted on the vehicle is performing wireless communication, a threshold value of a remaining charge amount at which charging of the power source is started is lowered compared to when the device is not performing wireless communication. Power control device. (7) A power supply control method for lowering a threshold of remaining charge at which charging of a power supply mounted on a vehicle starts when a device mounted on the vehicle is performing wireless communication, compared to when wireless communication is not performed. (8) A power supply control method executed by a power supply control device, comprising: A DC-DC converter is provided in the vehicle and controls charging of a power source, and charges the power source when a remaining charge of the power source falls below a threshold value; When the remaining charge of the power source falls below a threshold, if a communication device mounted on the vehicle is in operation, the operation of the DC-DC converter is suppressed. Power control method. (9) A DC-DC converter is provided in the vehicle and controls charging of a power source, and charges the power source when a remaining charge of the power source falls below a threshold value; When the remaining charge of the power source falls below a threshold, if a communication device mounted on the vehicle is in operation, the operation of the DC-DC converter is suppressed. A power control program that causes a computer to run.

[0128] 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]

[0129] 1 Power supply control device 3. Controller 10 Main power 11, 53, 60 DC / DC 20 Auxiliary power supply 22 Condition monitoring line 41 Intersystem switch 42 Battery switch 43 Bypass Switch 44 First Switch 45 Second Switch 46 Third Switch 47 4th Switch 48 5th Switch 49 6th Switch 51, 61 First voltage sensor 52, 62 Second voltage sensor 63 Third voltage sensor 64 4th voltage sensor 65 5th voltage sensor 66 6th voltage sensor 70 Bypass Switch 100 Automatic driving control device 101, 111 1st load 102 General load 103, 112 2nd load 113 Third load 114 4th load 110 1st system 120 2nd system 130 Intersystem Line 200 Communication Equipment

Claims

1. A power supply control device including a DC-DC converter provided in a vehicle and controlling charging of a power supply, and a controller that controls the DC-DC converter to charge the power supply when a remaining charge of the power supply falls below a threshold, The controller: When the remaining charge of the power source falls below a threshold, if a communication device mounted on the vehicle is in operation, the operation of the DC-DC converter is suppressed. Power control device.

2. The controller: The operation of the DC-DC converter is suppressed by stopping the DC-DC converter. The power supply control device according to claim 1 .

3. The controller: When the communication device is not in operation, when the remaining charge of the power source becomes less than a first threshold, the DCDC converter is controlled to charge the power source; When the communication device is in operation, if the remaining charge of the power source falls below a second threshold value that is lower than the first threshold value, the DCDC converter is controlled to charge the power source, thereby suppressing operation of the DCDC converter. The power supply control device according to claim 1 .

4. The controller: When the communication device is not in operation, charging the power source until the remaining charge of the power source reaches a first charge termination threshold; When the communication device is in operation, the power source is charged until a remaining charge of the power source reaches a second charge end threshold value that is lower than the first charge end threshold value, thereby suppressing operation of the DC-DC converter. The power supply control device according to claim 1 .

5. The power source is a power source capable of supplying power to a load related to automatic driving of a vehicle, The controller: An intention to perform the automatic driving is received from a driver in advance, and when the driver does not intend to perform the automatic driving, the operation of the DC-DC converter is suppressed by stopping the DC-DC converter. The power supply control device according to claim 1 .

6. A power supply control device provided in a vehicle and having a controller that controls charging of a power supply, The controller: When the device mounted on the vehicle is performing wireless communication, a threshold value of a remaining charge amount at which charging of the power source is started is lowered compared to when the device is not performing wireless communication. Power control device.

7. an inter-system switch that is provided so as to be able to connect a first system that supplies power from a first power source to a load and a second system that supplies power from a second power source to the load; a DC-DC converter that controls charging of the second power source; and a controller that connects the inter-system switch and controls the DC-DC converter to charge the second power source when a remaining charge of the second power source becomes less than a threshold value; Equipped with The controller: When the remaining charge of the second power source falls below a threshold, if a communication device mounted on the vehicle is in operation, the operation of the DC-DC converter is suppressed. Power control device.

8. a first system that supplies power from a first power source to a load; a second system that supplies power from a second power source to the load; a DC-DC converter that controls charging of the second power source; and a controller that controls the DC-DC converter to charge the second power source when a remaining charge of the second power source falls below a threshold value; Equipped with The controller: When the remaining charge of the second power source falls below a threshold, if a communication device mounted on the vehicle is in operation, the operation of the DC-DC converter is suppressed. Power control device.

9. A power supply control method for lowering a threshold of remaining charge at which charging of a power supply mounted on a vehicle starts when a device mounted on the vehicle is performing wireless communication, compared to when wireless communication is not performed.

10. A power supply control method executed by a power supply control device, comprising: A DC-DC converter is provided in the vehicle and controls charging of a power source, and charges the power source when a remaining charge of the power source falls below a threshold value; When the remaining charge of the power source falls below a threshold, if a communication device mounted on the vehicle is in operation, the operation of the DC-DC converter is suppressed. Power control method.

11. A DC-DC converter is provided in the vehicle and controls charging of a power source, and charges the power source when a remaining charge of the power source falls below a threshold value; When the remaining charge of the power source falls below a threshold, if a communication device mounted on the vehicle is in operation, operation of the DCDC converter is suppressed. A power control program that causes a computer to run.

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