Power supply control apparatus and storage medium

Abstract

A power supply control apparatus includes: a first switch coupled between a main power supply and a load; a second switch coupled between the secondary power supply and the load; and a controller configured to perform on / off control of the first switch and the second switch. The controller is configured to, in response to the ignition switch being turned off, turn off the first switch and turn on the second switch; and turning off the second switch and then turning on the first switch in response to the ignition switch being turned on.

Description

Technical Field

[0001] The embodiments disclosed herein relate to a power control device and a storage medium storing a power control program. Background Art

[0002] There is a system that includes a load that is operated by supplying power during a period when an ignition switch (hereinafter, referred to as "IG") of a vehicle is turned off, and a load that is operated by supplying power during a period when the IG is turned on (for example, see Japanese Patent Application Publication No. 2009-83527 (hereinafter, referred to as Patent Document 1)).

[0003] In such a system, when power is supplied from the main power supply to the loads operating during a period in which the IG is turned off, power from the main power supply may be insufficient when the IG is turned on and power supply to each load starts.

[0004] Therefore, it is desirable to provide a subsidiary power supply for supplying electric power during a period in which the IG is turned off, and to supply electric power from the subsidiary power supply to a load during the period in which the IG is turned off.

[0005] However, when the IG is turned on while power is supplied to the load during a period in which the IG is turned off, a surge may occur when switches of the respective units are changed between on and off, which causes malfunction of the switches.

[0006] One aspect of the embodiment is made in view of the above-mentioned problems, and its purpose is to provide a power supply control device and a power supply control program, which can prevent failure of the switch even if a surge occurs when the IG is turned on and power supply from the main power supply to the load starts. Summary of the invention

[0007] One aspect of the present disclosure relates to a power control device, the power control device comprising: a first switch coupled between a main power supply and a load; a second switch coupled between a secondary power supply and the load; and a controller configured to: perform on / off control of the first switch and the second switch. The controller is configured to: in response to an ignition switch being turned off, turn off the first switch and turn on the second switch; and in response to the ignition switch being turned on, turn off the second switch and then turn on the first switch.

[0008] The power supply control device and the power supply control program according to an aspect of the embodiment exhibit an effect that when the IG is turned on and power supply from the main power supply to the load starts, even if a surge occurs, malfunction of the switch can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Exemplary embodiments of the present disclosure will be described in detail based on the following drawings, in which:

[0010] Figure 1 is a diagram showing a configuration example of a power supply control device according to a first embodiment;

[0011] Figure 2 is a diagram showing an operation example of the power supply control device according to the first embodiment;

[0012] Figure 3 is a diagram showing an operation example of the power supply control device according to the first embodiment;

[0013] Figure 4 is a diagram showing an operation example of the power supply control device according to the first embodiment;

[0014] Figure 5 is a flowchart showing an example of processing performed by a controller of the power supply control device according to the first embodiment;

[0015] Figure 6 is a flowchart showing an example of processing performed by a controller of the power supply control device according to the first embodiment;

[0016] Figure 7 is a flowchart showing an example of processing performed by a controller of the power supply control device according to the first embodiment;

[0017] Figure 8 is a flowchart showing an example of processing performed by a controller of the power supply control device according to the first embodiment;

[0018] Fig. 9 is a diagram showing a configuration example of a power supply control device according to a second embodiment;

[0019] Fig.10 is a diagram showing an operation example of the power supply control device according to the second embodiment;

[0020] Fig.11 is a diagram showing an operation example of the power supply control device according to the second embodiment;

[0021] Fig.12 is a diagram showing an operation example of the power supply control device according to the second embodiment;

[0022] Fig.13 is a diagram showing an operation example of the power supply control device according to the second embodiment; and

[0023] Fig.14 is a flowchart showing an example of processing executed by the controller of the power supply control device according to the second embodiment. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of a power control device and a power control method will be described in detail with reference to the accompanying drawings. The present disclosure is not limited to the following embodiments. The power control device according to the embodiment is a device that performs control to supply power to an electronic device (hereinafter, referred to as a "load") installed on a vehicle.

[0025] [1. First embodiment]

[0026] [1-1. Configuration Example of Power Supply Control Device According to First Embodiment]

[0027] Figure 1 1 is a diagram showing a configuration example of a power supply control device 1 according to the first embodiment. Figure 1 As shown, the power supply control device 1 is connected to a main power supply 10 , a first load 101 , a second load 102 , an ignition switch of a vehicle (hereinafter, referred to as “IG 103 ”), and a notification device 104 .

[0028] The main power source 10 is, for example, a lead battery mounted on the vehicle. The main power source 10 may be a secondary battery other than the lead battery. The first load 101 is a device that operates during a period when the IG 103 is turned on, and is various electronic devices related to the travel of the vehicle, etc. The first load 101 includes, for example, an engine control device, a steering control device, a brake control device, an audio device, and a video display device.

[0029] The second load 102 is an electronic device that can operate at all times (including when the accessory switch is turned on) (i.e., during the period when the IG 103 is turned off and the period when the IG 103 is turned on). The second load 102 includes, for example, a driving recorder, a safety device, and an in-vehicle socket for supplying power to an external device. The notification device 104 includes a display device that displays various notification messages to the user, a sound reproduction device that reproduces the notification message, and the like.

[0030] The power control device 1 includes a sub power supply 20, a first system 110, a second system 120, first to seventh switches 11 to 17, and a controller 3. The sub power supply 20 may be, for example, a lithium ion battery, and the sub power supply 20 may be a secondary battery other than the lithium ion battery.

[0031] The subsidiary power supply 20 supplies power to the second load 102 during the period when the IG 103 is turned off. The subsidiary power supply 20 also serves as a backup power supply that supplies power to the first load 101 and the second load 102 instead of the main power supply 10 when a power failure occurs in the main power supply 10.

[0032] The first system 110 is a power line through which power from the main power source 10 is supplied to the first load 101 and the second load 102. The second system 120 is a power line through which power from the subsidiary power source 20 is supplied to the first load 101 and the second load 102.

[0033] The first switch 11 is a switch capable of connecting and disconnecting the main power source 10 and the first system 110. The second switch 12 is a switch capable of connecting and disconnecting the sub-power source 20 and the second system 120.

[0034] The third switch 13 is an inter-system switch capable of connecting and disconnecting the first system 110 and the second system 120. The third switch 13 may be a DCDC converter (DC / DC) that adjusts a voltage difference between the first system 110 and the second system 120. When the third switch 13 is a DC / DC, the DC / DC connects the first system 110 and the second system 120 by operating, and disconnects the first system 110 and the second system 120 by stopping operating.

[0035] The fourth switch 14 is a switch capable of connecting and disconnecting the first system 110 and the first load 101. The fifth switch 15 is a switch capable of connecting and disconnecting the second system 120 and the first load 101.

[0036] The sixth switch 16 is a switch capable of connecting and disconnecting the first system 110 and the second load 102. The seventh switch 17 is a switch capable of connecting and disconnecting the second system 120 and the second load 102.

[0037] The controller 3 includes a microcomputer including a central processing unit (CPU), a read only memory (ROM), and a random access memory (RAM), and various circuits. The controller 3 controls the first to seventh switches 11 to 17 by the CPU executing a program stored in the ROM using the RAM as a work area.

[0038] When receiving a signal indicating that the IG 103 is turned on or a signal indicating that the IG 103 is turned off, the controller 3 controls the first to seventh switches 11 to 17 according to the received signal.

[0039] The controller 3 monitors faults of the first system 110 and the second system 120 based on detection results of a voltage sensor (not shown) detecting a voltage of the first system 110 and a voltage sensor (not shown) detecting a voltage of the second system 120. When a fault occurs in any system, the controller 3 controls the first to seventh switches 11 to 17 to supply power to the first load 101 and the second load 102 through the other system.

[0040] A part or the whole of the controller 3 may be implemented by hardware such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

[0041] [1-2. Operation Example of Power Supply Control Device According to First Embodiment]

[0042] Next, we will refer to Figures 2 to 4 An operation example of the power supply control device 1 according to the first embodiment is described. Figures 2 to 4 is a diagram showing an operation example of the power supply control device 1 according to the first embodiment.

[0043] When the vehicle is parked, that is, when the IG 103 is turned off, as shown in FIG. Figure 2 As shown, the power control device 1 turns off the first switch 11 and the third switch 13 to the sixth switch 16, turns on the second switch 12 and the seventh switch 17, and supplies power from the subsidiary power supply 20 to the second load 102. Therefore, the power control device 1 can operate, for example, safety equipment during parking.

[0044] Thereafter, when the IG 103 is turned on, the power supply control device 1 turns off the second switch 12 , turns on the first switch 11 and the third to seventh switches 13 to 17 , and supplies power from the main power supply 10 to the first and second loads 101 and 102 .

[0045] However, when the power supply control device 1 turns on the first switch 11 immediately after the IG 103 is turned on with the second switch 12 turned on, and then turns off the second switch 12 with current flowing in the second switch 12, a surge may occur and the second switch 12 may malfunction.

[0046] Therefore, when detecting the turning-on of the IG 103 , the controller 3 temporarily keeps the first switch 11 OFF, and then turns on the first switch 11 to supply power from the main power source 10 to the first load 101 .

[0047] At this time, for example, Figure 3 As shown, when receiving the signal IG-ON indicating that the IG 103 is turned on from the vehicle, the controller 3 may turn off the seventh switch 17 and then turn off the second switch 12 in a state where the first switch 11 is temporarily kept turned off.

[0048] Therefore, when the second switch 12 is turned off, no current flows through the second switch 12. Therefore, even if the second switch 12 is turned off, the controller 3 can prevent the malfunction of the second switch 12 due to the surge.

[0049] Afterwards, if Figure 4As shown, the controller 3 turns on the first switch 11 and the third to seventh switches 13 to 17 while the second switch 12 is turned off, and supplies power from the main power supply 10 to the first load 101 and the second load 102. Therefore, the power supply control device 1 can make the vehicle enter a drivable state.

[0050] Here, the controller 3 turns off the seventh switch 17 before turning off the second switch 12, but this is an example. If the power consumption of the second load 102 is less than the predetermined power, even if the power control device 1 turns off the second switch 12 and the seventh switch 17 is kept turned on, the possibility of the second switch 12 malfunctioning due to surge is low.

[0051] When the turning-on of the IG 103 is detected, if there is a second load 102 whose power consumption is equal to or greater than the predetermined power, the controller 3 may request the user to stop the operation of the second load 102. For example, when the turning-on of the IG 103 is detected, the controller 3 causes the notification device 104 to output a notification message such as “Please stop the external device” when the user connects to the in-vehicle socket and uses the external device. Whether the power consumption of the external device is equal to or greater than the predetermined power may be detected by a current sensor or the like (not shown) that detects the current flowing through the socket included in the second load 102.

[0052] Therefore, in the power supply control device 1, if the user stops the operation of the second load 102 in response to the stop request, when the second switch 12 is turned off as the IG 103 is turned on, no current flows through the second switch 12, so that failure of the second switch 12 due to surge can be prevented.

[0053] When the power consumption of the second load 102 decreases to less than the predetermined power after the stop operation is requested, the controller 3 may turn off the second switch 12 and then turn on the first switch 11. Therefore, in the power supply control device 1, since the current flowing through the second switch 12 decreases when the second switch 12 is turned off, even if the second switch 12 is turned off, a malfunction of the second switch 12 due to a surge can be prevented.

[0054] When a predetermined period of time has passed after the request to stop the operation, the controller 3 may turn off the second switch 12 and then turn on the first switch 11. Therefore, if the user stops the operation of the second load 102 in response to the stop request during the predetermined period of time, when the second switch 12 is turned off, the power supply control device 1 can prevent the malfunction of the second switch 12 due to the surge and prevent the start delay of the post-startup process.

[0055] When the IG 103 is detected to be turned on, if there is a second load 102 whose power consumption is equal to or greater than the predetermined power, the controller 3 notifies the user that the second load 102 will be stopped, stops the operation of the second load 102, turns off the second switch 12, and then turns on the first switch 11.

[0056] Therefore, because the second load 102 has not been operated and no current flows through the second switch 12 when the second switch 12 is turned off, the power supply control device 1 can prevent malfunction of the second switch 12 due to surge when the second switch 12 is turned off.

[0057] When detecting turning on of the IG 103 , if there is a device in which the user recognizes a change due to the momentary interruption of the power supply, the controller 3 notifies the user of the change, then turns off the second switch 12 , and then turns on the first switch 11 .

[0058] For example, when detecting the turning-on of the IG 103, the controller 3 causes the notification device 104 to output a notification message such as "output is temporarily interrupted" while the user is using an external device.

[0059] Therefore, through the power supply control device 1, the user can recognize that the change in the operating state of the second load 102 due to the turning on of the IG 103 is not a failure.

[0060] [1-3. Processing Executed by Controller According to First Embodiment]

[0061] Next, we will refer to Figures 5 to 8 The process performed by the controller 3 of the power supply control device 1 is described. Figures 5 to 8 : is a flowchart showing an example of processing executed by the controller 3 of the power supply control device 1 according to the first embodiment.

[0062] When the IG 103 is detected to be turned off, the controller 3 executes Figure 5 Specifically, Figure 5 As shown, the controller 3 first turns off the first switch 11 and turns on the second switch 12 (step S101).

[0063] At this time, the controller 3 turns off the third to sixth switches 13 to 16 while keeping the seventh switch 17 turned on (step S101). Therefore, the controller 3 can operate the second load 102 by supplying power from the subsidiary power supply 20 to the second load 102 when the IG 103 is turned off.

[0064] Thereafter, the controller 3 determines whether turning on of the IG 103 is detected (step S102). When turning on of the IG 103 is not detected (step S102, No), the controller 3 repeats the determination process in step S102 until turning on of the IG 103 is detected.

[0065] When the IG 103 is detected to be turned on (step S102, yes), the controller 3 keeps the first switch 11 off (step S103), and then performs the startup process (step S104). Figures 6 to 8 An example of the startup process is described. Subsequently, the controller 3 performs a post-startup process (step S105).

[0066] In post-startup processing, for example, when Figure 4 When a power failure of the first system 110 is detected in the state shown, the controller 3 turns off the third switch 13, the fourth switch 14, and the sixth switch 16, and supplies power from the secondary power supply 20 to the first load 101 and the second load 102. Therefore, even if a power failure occurs in the first system 110, the power control device 1 can continue the operation of the first load 101 and the second load 102.

[0067] For example, when Figure 4 When a power failure of the second system 120 is detected in the state shown, the controller 3 turns off the third switch 13, the fifth switch 15, and the seventh switch 17, and supplies power from the main power supply 10 to the first load 101 and the second load 102. Therefore, even if a power failure occurs in the second system 120, the power control device 1 can continue the operation of the first load 101 and the second load 102.

[0068] Thereafter, the controller 3 determines whether the shutdown of the IG 103 is detected (step S106). In response to determining that the shutdown of the IG 103 is not detected (step S106, No), the controller 3 moves the process to step S105. In response to determining that the shutdown of the IG 103 is detected (step S106, Yes), the controller 3 ends the process and starts the process again from step S101.

[0069] In step S104, the controller 3 executes, for example, Figure 6 Specifically, as shown in the first startup process Figure 6 As shown, when the first startup process is started, the controller 3 first determines whether there is a second load 102 whose power consumption is equal to or greater than a predetermined power (step S201).

[0070] In response to determining that there is no second load 102 whose power consumption is equal to or greater than the predetermined power (step S201, No), the controller 3 moves the process to step S205. In response to determining that there is a second load 102 whose power consumption is equal to or greater than the predetermined power (step S201, Yes), the controller 3 requests the user to stop the operation of the second load 102 (step S202).

[0071] Therefore, in the power supply control device 1, if the user stops the operation of the second load 102 in response to the stop request, when the second switch 12 is turned off as the IG 103 is turned on, no current flows through the second switch 12, so that failure of the second switch 12 due to surge can be prevented.

[0072] Subsequently, the controller 3 determines whether the power consumption of the second load 102 is reduced to less than the predetermined power (step S203). In response to determining that the power consumption of the second load 102 is reduced to less than the predetermined power (step S203, yes), the controller 3 Figure 4 The state shown turns off the second switch 12 (step S205), and then turns on the first switch 11 (step S206).

[0073] Therefore, in the power supply control device 1, since the current flowing through the second switch 12 decreases when the second switch 12 is turned off, even if the second switch 12 is turned off, malfunction of the second switch 12 due to surge can be prevented.

[0074] After step S206, the controller 3 turns on the third switch 13 to the sixth switch 16 (step S207) and sets Figure 4 Controller 3 moves the process to Figure 5 Step S105 is shown.

[0075] In response to determining that the power consumption of the second load 102 has not decreased to less than the predetermined power (step S203, No), the controller 3 determines whether a predetermined time period has passed after requesting to stop the operation of the second load 102 (step S204). In response to determining that the predetermined time period has not passed (step S204, No), the controller 3 moves the process to step S203.

[0076] In response to determining that the predetermined time period has passed (step S204, yes), the controller 3 moves the process to step S205. Therefore, if the user stops the operation of the second load 102 in response to the stop request during the predetermined time period, when the second switch 12 is turned off, the power supply control device 1 can prevent the malfunction of the second switch 12 due to the surge and prevent the start delay of the post-startup process.

[0077] In step S104, the controller 3 may execute, for example, Figure 7Specifically, as shown in the second startup process Figure 7 As shown, when starting the second startup process, the controller 3 first determines whether there is a second load 102 whose power consumption is equal to or greater than the predetermined power (step S301). In response to determining that there is no second load 102 whose power consumption is equal to or greater than the predetermined power (step S301, no), the controller 3 moves the process to step S304.

[0078] In response to determining that there is a second load 102 whose power consumption is equal to or greater than the predetermined power (step S301, yes), the controller 3 notifies the user that the second load 102 will be stopped (step S302), and then stops the second load 102 (step S303). Thereafter, the controller 3 turns off the second switch 12 (step S304), then turns on the first switch 11 (step S305), and turns on the third switch 13 to the sixth switch 16 (step S306). The controller 3 moves the processing to Figure 5 Step S105 is shown.

[0079] Therefore, because the second load 102 has not been operated and no current flows through the second switch 12 when the second switch 12 is turned off, the power supply control device 1 can prevent malfunction of the second switch 12 due to surge when the second switch 12 is turned off.

[0080] In step S104, the controller 3 may execute, for example, Figure 8 Specifically, as shown in the third startup process Figure 8 As shown, when the third startup process is started, the controller 3 first determines whether there is a device in which the user recognizes a change due to a momentary interruption of the power supply (step S401).

[0081] The device in which the user recognizes a change due to the momentary interruption is, for example, a driving recorder with a built-in display, an electronic device operated by power supply from an in-vehicle socket, or an electric appliance.

[0082] In response to determining that there is no device in which the user recognizes the change due to the momentary interruption (step S401, no), the controller 3 moves the processing to step S403. In response to determining that there is a device in which the user recognizes the change due to the momentary interruption (step S401, yes), the controller 3 notifies the user that the operating state of the device in use has changed (step S402). The controller 3 turns off the second switch 12 (step S403), then turns on the first switch 11 (step S404), turns on the third switch 13 to the sixth switch 16 (step S405), and moves the processing to step S403. Figure 5 Step S105 is shown.

[0083] At this time, the power supply to the second load 102 is momentarily interrupted by turning off the second switch 12, and the operating state of the second load 102 may change due to the reduction in the supplied power. When the first switch 11 is turned on and the operation of the first load 101 is started, the voltage of the main power supply 10 is temporarily reduced, and the operating state of the second load 102 may change due to the reduction in the supplied power.

[0084] Therefore, as described above, the power control device 1 notifies the user in advance that the operating state of the device in use has changed. Therefore, through the power control device 1, the user can recognize that the change in the operating state of the device due to the turning on of the IG 103 is not caused by a failure of the device.

[0085] [2. Second embodiment]

[0086] [2-1. Configuration of Power Supply Control Device According to Second Embodiment]

[0087] Next, we will refer to Fig. 9 The configuration of a power supply control device 1A according to the second embodiment is described. Fig. 9 1A is a diagram showing a configuration example of a power supply control device 1A according to a second embodiment. The power supply control device 1A is installed in a Fig. 9 The main power supply 10A shown supplies electric power for traveling an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle.

[0088] like Fig. 9 As shown, the power control device 1A is connected to the main power supply 10A via a DCDC converter (hereinafter, referred to as "DC / DC 10B"). The power control device 1A is connected to the sub-power supply 20A. The power control device 1A is connected to the (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203 and the (2-2)th load 204.

[0089] The power control device 1A is connected to the IG 10C. When turned on, the IG 10C outputs a start signal to the power control device 1A. When turned off, the IG 10C outputs an end signal to the power control device 1A.

[0090] The main power supply 10A includes a high voltage battery capable of outputting a voltage higher than that of the sub-power supply. The high voltage battery is, for example, a lithium ion battery. The DC / DC 10B steps down the voltage of the main power supply 10A and outputs the voltage to the power supply control device 1A.

[0091] The main power supply 10A supplies power to the (1-1)th load 201, (1-2)th load 202, (2-1)th load 203, and (2-2)th load 204 and a motor driving the vehicle via the DC / DC 10B and the power supply control device 1A.

[0092] The secondary power supply 20A includes a low voltage battery capable of outputting a voltage lower than the voltage of the high voltage battery. The low voltage battery is, for example, a lead battery. The low voltage battery may be a lithium ion battery. The secondary power supply 20A supplies power to the (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203, and the (2-2)th load 204 via the power supply control device 1A.

[0093] The (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203, and the (2-2)th load 204 are electric loads installed on the vehicle. The (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203, and the (2-2)th load 204 include, for example, an engine control device, a steering control device, a brake control device, an audio device, and a video display device.

[0094] The (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203, and the (2-2)th load 204 include, for example, a driving recorder, a safety device, and an in-vehicle socket for supplying power to an external device. In the following description, the (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203, and the (2-2)th load 204 may be simply collectively referred to as a load.

[0095] In the present embodiment, it is assumed that the (1-1)th load 201 and the (1-2)th load 202 are loads having the same function. In the present embodiment, it is assumed that the (2-1)th load 203 and the (2-2)th load 204 are loads having the same function. However, the (2-1)th load 203 and the (2-2)th load 204 have functions different from those of the (1-1)th load 201 and the (1-2)th load 202.

[0096] The (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203, and the (2-2)th load 204 each include a capacitor 5. The capacitor 5 smoothes and stabilizes the power supplied from the power supply control device 1A, and stores the power.

[0097] Therefore, when the power stored in capacitor 5 remains, even if the power supply from power supply control device 1A is interrupted momentarily, (1-1)th load 201, (1-2)th load 202, (2-1)th load 203 and (2-2)th load 204 can maintain operation.

[0098] The power supply control device 1A includes a first switch 21 , a second switch 22 , a third switch 23 , a fourth switch 24 , a fifth switch 25 , a sixth switch 26 , and a controller 3A.

[0099] The power supply control device 1A further includes a first voltage sensor 41 , a second voltage sensor 42 , a third voltage sensor 43 , a fourth voltage sensor 44 , a fifth voltage sensor 45 , a sixth voltage sensor 46 , and a seventh voltage sensor 47 .

[0100] The first switch 21 is a switch that connects the main power supply 10A to the load. The second switch 22 is a switch that connects the sub-power supply 20A to the load. Specifically, the first switch 21 has one end connected to the main power supply 10A via the DC / DC 10B, and the other end connected to the shared wiring 100 shared by the (1-1) load 201, the (1-2) load 202, the (2-1) load 203, and the (2-2) load 204. The second switch 22 has one end connected to the sub-power supply 20A, and the other end connected to the shared wiring 100.

[0101] The third switch 23 is a switch that connects the shared wiring 100 and the (1-1)th load 201. The fourth switch 24 is a switch that connects the shared wiring 100 and the (1-2)th load 202. The fifth switch 25 is a switch that connects the shared wiring 100 and the (2-1)th load 203. The sixth switch 26 is a switch that connects the shared wiring 100 and the (2-2)th load 204.

[0102] The first voltage sensor 41 detects the voltage of the connection line connecting the first switch 21 and the DC / DC 10B, and outputs the detection result to the controller 3A. The second voltage sensor 42 detects the voltage of the connection line connecting the second switch 22 and the subsidiary power supply 20A, and outputs the detection result to the controller 3A.

[0103] The third voltage sensor 43 detects the voltage of the connection line connecting the third switch 23 and the (1-1)th load 201, and outputs the detection result to the controller 3A. The fourth voltage sensor 44 detects the voltage of the connection line connecting the fourth switch 24 and the (1-2)th load 202, and outputs the detection result to the controller 3A.

[0104] The fifth voltage sensor 45 detects the voltage of the connection line connecting the fifth switch 25 and the (2-1)th load 203, and outputs the detection result to the controller 3A. The sixth voltage sensor 46 detects the voltage of the connection line connecting the sixth switch 26 and the (2-2)th load 204, and outputs the detection result to the controller 3A. The seventh voltage sensor 47 detects the voltage of the shared wiring 100, and outputs the detection result to the controller 3A.

[0105] The controller 3A includes a microcomputer including a CPU, a ROM, and a RAM, and various circuits. The controller 3A controls the first to sixth switches 21 to 26 by the CPU executing a power control program stored in the ROM using the RAM as a work area.

[0106] A part or all of the controller 3A may be implemented by hardware such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

[0107] The controller 3A electrically connects (conducts) both terminals of the first to sixth switches 21 to 26 by turning on the first to sixth switches 21 to 26. The controller 3A electrically disconnects both terminals of the first to sixth switches 21 to 26 by turning off the first to sixth switches 21 to 26.

[0108] [2-2. Operation Example of Power Supply Control Device According to Second Embodiment]

[0109] Next, we will refer to Figures 10 to 13 An operation example of the power supply control device 1A according to the second embodiment is described. Figures 10 to 13 1A is a diagram showing an operation example of the power supply control device 1A according to the second embodiment.

[0110] When the vehicle is parked (i.e., the IG is turned off), Fig.10 As shown, the controller 3A turns off the first switch 21 and turns on the second switch 22. In addition, the controller 3A turns on the third switch 23 to the sixth switch 26.

[0111] Therefore, while the IG is turned off, the (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203, and the (2-2)th load 204 can continue to operate by power supplied from the subsidiary power supply 20A via the power supply control device 1A.

[0112] Thereafter, when the IG 10C is turned on and a start signal is input from the IG 10C, the controller 3A supplies power from the main power supply 10A to the (1-1)th load 201, (1-2)th load 202, (2-1)th load 203, and (2-2)th load 204.

[0113] At this time, Fig.10 In the state shown, ie, when the IG 10C is turned on during power supply from the sub-power supply 20A to the load and the first switch 21 is turned on to start power supply from the main power supply 10A to the load, a surge may occur to cause a malfunction of the second switch 22 .

[0114] Therefore, when Fig.10When the IG 10C is turned on during the period in which the IG 10C is turned off, the controller 3 Fig.11 Turn off the second switch 22 as shown, and then Fig.12 As shown, the first switch 21 is turned on.

[0115] Therefore, because the second switch 22 has been turned off when the first switch 21 is turned on and no current flows through the shared wiring 100 , by turning on the first switch 21 , the power supply control device 1A can prevent malfunction of the second switch 22 even if a surge occurs.

[0116] Afterwards, if Fig.13 As shown, the controller 3A turns on the second switch 22. That is, when the IG 10C is turned on, the controller 3A turns on the first switch 21 after turning off the second switch 22, and then turns on the second switch.

[0117] Therefore, the power supply control device 1A can charge the sub-power supply 20A by turning on the second switch 22 again after the power supply from the main power supply 10A to the load is stabilized, while preventing the malfunction of the second switch 22 .

[0118] When the IG is switched from OFF to ON, the controller 3 turns OFF the second switch 22 and then turns ON the first switch 21 while the operation of each load does not stop even if the power supply to each load is momentarily interrupted.

[0119] Specifically, when the IG 10C is turned on, the controller 3A turns on the first switch 21 during the period from when the second switch 22 is turned off until a time period in which each load can keep operating by the power of the capacitor 5 included in the load has passed.

[0120] Therefore, after the second switch 22 is turned off while the first switch 21 is turned off, even if the power supply to each load is momentarily interrupted, the power control device 1A can maintain the operation of each load by turning on the first switch 21 while maintaining the operation of each load through the power of the capacitor 5.

[0121] [2-3. Processing Executed by Controller According to Second Embodiment]

[0122] Next, we will refer to Fig.14 The process executed by the controller 3A of the power supply control device 1A is described. Fig.14 : is a flowchart showing an example of processing performed by the controller 3A of the power supply control device 1A according to the second embodiment.

[0123] When the IG 10C switches from off to on, the controller 3A starts Fig.14 Therefore, the controller 3A is in the state from the power supply control device 1A Fig.10 The state shown (ie, the state where the first switch 21 is turned off and the second switch 22 to the sixth switch 26 are turned on) starts Fig.14 Processing shown.

[0124] Specifically, Fig.14 As shown in FIG. 1 , when the IG 10C is turned on, the controller 3A first determines whether the load is in operation (step S501). In response to determining that the load is in operation (step S501, yes), the controller 3A keeps the first switch 21 off and turns off the second switch 22 (step S502). Therefore, the power supply control device 1A is in Fig.11 Status shown.

[0125] That is, when at least one of the (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203, and the (2-2)th load 204 is operating, the controller 3A keeps the first switch 21 turned off and turns off the second switch 22. Therefore, the controller 3A can be in a state where no current flows through the shared wiring 100 temporarily.

[0126] Thereafter, the controller 3A moves the process to step S503. In response to determining that the load is not in operation (step S501, No), the controller 3A moves the process to step S503. That is, when the (1-1)th load 201, the (1-2)th load 202, the (2-1)th load 203, and the (2-2)th load 204 are all not in operation, the controller 3A moves the process to step S503.

[0127] In step S503, the controller 3A turns on the first switch 21 and keeps the second switch 22 off. In response to "No" in step S501, the controller 3A switches the second switch 22 from on to off. Therefore, the power supply control device 1A is in Fig.12 Status shown.

[0128] Thereafter, the controller 3A keeps the first switch 21 turned on, turns on the second switch 22 (step S504), and ends the process. Fig.13 Status shown.

[0129] When charging of the subsidiary power supply 20A is completed, the controller 3A may also turn off the second switch 22. In this case, the controller 3A determines based on the detection result of the second voltage sensor 42 whether charging of the subsidiary power supply 20A is completed.

[0130] After the charging of the subsidiary power supply 20A is completed and the second switch 22 is turned off, when the storage capacity of the subsidiary power supply 20A is equal to or less than the predetermined storage capacity, the controller 3A can turn on the second switch 22 again. In this case, the controller 3A determines whether the storage capacity of the subsidiary power supply 20A is equal to or less than the predetermined storage capacity based on the detection result of the second voltage sensor 42.

[0131] [2-4. Operation of the Power Supply Control Device According to the Second Embodiment When a Ground Fault is Detected]

[0132] In the power supply control device 1A, Fig.13 In the state shown (ie, in the state where the IG is turned on and the first to sixth switches 21 to 26 are finally turned on), a ground fault may occur between the power supply control device 1A and the DC / DC 10B, the sub power supply 20A, or the load.

[0133] Therefore, the controller 3A detects the occurrence of a ground fault based on the detection results of the first to seventh voltage sensors 41 to 47 , specifies the occurrence point of the ground fault, and performs fail-safe control to disconnect the ground fault point and the power supply control device 1A.

[0134] When the voltage detected by any one of the first to seventh voltage sensors 41 to 47 is equal to or less than the ground fault threshold, the controller 3A detects the occurrence of a ground fault. In response to detecting the occurrence of a ground fault, the controller 3A turns off all of the third to sixth switches 23 to 26 as load switches in a state where the first and second switches 21 and 22 are turned on.

[0135] When a ground fault occurs between the power control device 1A and the load, the voltage detected by the first voltage sensor 41 and the second voltage sensor 42 returns to the original state by turning off all of the third switch 23 to the sixth switch 26. If the voltage detected by the first voltage sensor 41 or the second voltage sensor 42 returns to the threshold voltage or more, the controller 3A determines that a ground fault occurs between the power control device 1A and the load.

[0136] In this case, the controller 3A sequentially turns on the third switch 23 to the sixth switch 26 to specify the load where the ground fault occurs. Specifically, the controller 3A first turns on the third switch 23 (and turns off the fourth switch 24 to the sixth switch 26).

[0137] At this time, if the voltage detected by the third voltage sensor 43 (or the voltage detected by the first voltage sensor 41 or the second voltage sensor 42) is equal to or less than the threshold, the controller 3A determines that a ground fault occurs between the (1-1) load 201 and the power supply control device 1A (i.e., a ground fault occurs in the (1-1) load 201).

[0138] In this case, the controller 3A turns off only the third switch 23 which is closest to the (1-1)th load 201 as the ground fault point and can disconnect the load, and turns on other switches. Therefore, the controller 3A can perform fail-safe control to disconnect the ground fault point from the power supply control device 1A.

[0139] On the other hand, when the third switch 23 is turned on (the fourth switch 24 to the sixth switch 26 are turned off), if the voltage detected by the third voltage sensor 43 returns to the threshold or greater, the controller 3A determines that no ground fault occurs between the (1-1) load 201 and the power supply control device 1A (i.e., the (1-1) load 201 is normal).

[0140] In this case, the controller 3A then turns on the fourth switch 24 (the third switch 23 and the fifth switch 25 to the sixth switch 26 are turned off), and similarly specifies whether a ground fault occurs between the (1-2)th load 202 and the power supply control device 1A (i.e., whether a ground fault occurs in the (1-2)th load 202). Thereafter, similarly, the controller 3A sequentially turns on the fifth switch 25 and the sixth switch 26 until the load in which the ground fault occurs can be specified, and specifies the load in which the ground fault occurs.

[0141] When the designation of the load where the ground fault occurs is completed, the controller 3A turns off the load switch which is closest to the ground fault point and can disconnect the designated load, and turns on the other load switches to perform fail-safe control.

[0142] For example, when the controller 3A specifies the ground fault point as the (2-1)th load 203 and the power supply control device 1A, the controller 3A turns off the fifth switch 25, which is the load switch closest to the ground fault point and capable of disconnecting the specified load, and turns on other load switches (the third switch 23, the fourth switch 24, and the sixth switch 26). Therefore, the controller 3A disconnects the (2-1)th load 203 as the ground fault point, and performs fail-safe control using loads other than the (2-1)th load 203.

[0143] When the controller 3A detects the occurrence of a ground fault and turns off all of the third switches 23 to the sixth switches 26 serving as load switches while the first switch 21 and the second switch 22 are turned on, if the voltage detected by the first voltage sensor 41 or the second voltage sensor 42 does not return to the threshold or greater, the controller 3A determines that a ground fault has occurred between the power control device 1A and the DC / DC 10B or between the power control device 1A and the auxiliary power supply 20A.

[0144] In this case, the controller 3A then turns off the first switch 21, turns on the second switch 22, and turns on the third switch 23 to the sixth switch 26. At this time, if a ground fault occurs between the power supply control device 1A and the DC / DC 10B, the voltage detected by the first voltage sensor 41 keeps decreasing to the threshold value or less even if the first switch 21 is turned off. On the other hand, if a ground fault does not occur between the power supply control device 1A and the DC / DC 10B, the voltage detected by the first voltage sensor 41 returns to the threshold value or more by turning off the first switch 21.

[0145] Therefore, when the first switch 21 is turned off, the second switch 22 is turned on, and the third switch 23 to the sixth switch 26 are turned on, if the voltage detected by the first voltage sensor 41 is equal to or less than the threshold value, the controller 3A determines that a ground fault occurs between the power supply control device 1A and the DC / DC 10B (i.e., a ground fault occurs on the main power supply 10A side).

[0146] In this case, the controller 3A turns off the first switch 21, turns on the second switch 22, and turns on the third switch 23 to the sixth switch 26, thereby disconnecting the main power supply 10A side which is the ground fault point, and uses the secondary power supply 20A to perform fail-safe control, wherein the first switch 21 is the switch closest to the ground fault point and capable of disconnecting the ground fault point.

[0147] On the other hand, when the first switch 21 is turned off, the second switch 22 is turned on, and the third switch 23 to the sixth switch 26 are turned on, if the voltage detected by the first voltage sensor 41 returns to the threshold or greater, the controller 3A determines that no ground fault occurs between the power control device 1A and the DC / DC 10B (i.e., the main power supply side is normal).

[0148] In this case, the controller 3A then turns off the second switch 22 , turns on the first switch 21 , turns on the third to sixth switches 23 to 26 , and similarly determines whether a ground fault occurs between the power supply control device 1A and the subsidiary power supply 20A based on the voltage detected by the second voltage sensor 42 .

[0149] When the controller 3A determines that a ground fault occurs between the power control device 1A and the auxiliary power supply 20A (i.e., a ground fault occurs on the auxiliary power supply 20A side), the controller 3A turns off the second switch 22, turns on the first switch 21, and turns on the third switch 23 to the sixth switch 26, thereby disconnecting the auxiliary power supply 20A side which is the ground fault point, and uses the main power supply 10A to perform fault safety control. The second switch 22 is the switch closest to the ground fault point and capable of disconnecting the ground fault point.

[0150] In this way, when the occurrence point of the ground fault is specified, the controller 3A turns off the switch closest to the occurrence point of the ground fault among the first switch 21, the second switch 22, and the load switch (the third switch 23 to the sixth switch 26). In other words, the controller 3A turns off the switch that can disconnect the occurrence point of the ground fault. Therefore, the controller 3A can perform fail-safe control by disconnecting the occurrence point of the ground fault from the power supply control device 1A.

[0151] [3. Appendix]

[0152] As an appendix, features of the present disclosure are described below.

[0153] (1) A power control device comprising:

[0154] A first switch coupled between the main power source and the load;

[0155] A second switch coupled between the secondary power source and the load; and

[0156] A controller is configured to: perform on / off control of the first switch and the second switch, wherein:

[0157] The controller is configured to:

[0158] In response to the ignition switch being turned off, turning off the first switch and turning on the second switch; and

[0159] In response to the ignition switch being turned on, the second switch is turned off and then the first switch is turned on.

[0160] (2) The power supply control device according to (1), wherein:

[0161] The controller is configured to, in response to the ignition switch being turned on, turn on the first switch after turning off the second switch and then turn on the second switch.

[0162] (3) The power supply control device according to (1) or (2), wherein:

[0163] The controller is configured to, in response to the ignition switch being turned on, turn on the first switch during a period starting from when the second switch is turned off until a time period in which the load can maintain operation by power of a capacitor of the load has passed.

[0164] (4) The power supply control device according to any one of (1) to (3), further comprising:

[0165] A first system is configured to: supply power from a main power source to a load via a first switch;

[0166] a second system configured to: supply power from the secondary power supply to the load via the second switch; and

[0167] The inter-system switch is coupled between the first system and the second system, wherein:

[0168] The controller is configured to:

[0169] In response to the ignition switch being turned off, turning off the inter-system switch; and

[0170] In response to the ignition switch being turned on, the inter-system switch is turned on when the first switch is turned on.

[0171] (5) The power supply control device according to any one of (1) to (4), further comprising:

[0172] A load switch is coupled between the connection wiring and each of the plurality of loads, the connection wiring connecting the first switch and the second switch, wherein

[0173] The controller is configured to, when a ground fault is detected, specify an occurrence point of the ground fault and turn off a switch closest to the occurrence point of the ground fault among the first switch, the second switch, and the load switch.

[0174] (6) A non-transitory computer-readable storage medium storing a power control program, the power control program causing a controller to execute a process, the process comprising:

[0175] performing on / off control of a first switch configured to connect the main power supply to the load and a second switch configured to connect the sub-power supply to the load,

[0176] Among other things, the processing also includes:

[0177] In response to the ignition switch being turned off, turning off the first switch and turning on the second switch; and

[0178] In response to the ignition switch being turned on, the second switch is turned off and then the first switch is turned on.

[0179] Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Therefore, various modifications can be made without departing from the spirit or scope of the overall inventive concept defined by the attached claims and their equivalents.

Claims

1. A power control device, comprising: A first switch coupled between the main power source and the load; A second switch coupled between the secondary power source and the load; as well as A controller is configured to: perform on / off control of the first switch and the second switch, wherein: The controller is configured to: In response to an ignition switch being turned off, turning off the first switch and turning on the second switch; and In response to the ignition switch being turned on, the second switch is turned off and then the first switch is turned on.

2. The power control device according to claim 1, wherein: The controller is configured to, in response to the ignition switch being turned on, turn on the first switch after turning off the second switch and then turn on the second switch.

3. The power control device according to claim 1 or 2, wherein: The controller is configured to, in response to the ignition switch being turned on, turn on the first switch during a period starting from when the second switch is turned off until a time period in which the load can maintain operation by power of a capacitor of the load has elapsed.

4. The power control device according to any one of claims 1 to 3, further comprising: A first system configured to: supply power from the main power source to the load via the first switch; a second system configured to: supply power from the secondary power supply to the load via the second switch; as well as an inter-system switch, coupled between the first system and the second system, wherein: The controller is configured to: in response to the ignition switch being turned off, turning off the inter-system switch; and In response to the ignition switch being turned on, the inter-system switch is turned on when the first switch is turned on.

5. The power control device according to any one of claims 1 to 4, further comprising: a load switch coupled between a connection wiring and each of a plurality of loads, the connection wiring connecting the first switch and the second switch, wherein The controller is configured to, when a ground fault is detected, specify an occurrence point of the ground fault and turn off a switch closest to the occurrence point of the ground fault among the first switch, the second switch, and the load switch.

6. A non-transitory computer-readable storage medium storing a power control program, the power control program causing a controller to perform a process, the process comprising: performing on / off control of a first switch and a second switch, the first switch being coupled between a main power source and a load, and the second switch being coupled between a secondary power source and the load, The processing further includes: In response to an ignition switch being turned off, turning off the first switch and turning on the second switch; and In response to the ignition switch being turned on, the second switch is turned off and then the first switch is turned on.

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