Power supply control device and power supply control program

Abstract

To provide a power supply control device and a power supply control program capable of preventing a switch from failing even when a surge occurs when an IG is turned on to start supplying power from a main power supply to a load.SOLUTION: A power supply control device according to an embodiment includes a first switch, a second switch, and a controller. The first switch connects a main power supply to a load. The second switch connects a sub-power supply to the load. The controller controls the on / off of the first switch and the second switch. When an ignition switch is off, the controller turns off the first switch and turns on the second switch. When the ignition switch is on, the controller turns off the second switch and then turns on the first switch.SELECTED DRAWING: Figure 9

Description

[Technical field]

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

[0002] There is a system that includes a load that is operated by supplying power to it while a vehicle's ignition switch (hereinafter referred to as "IG") is off, and a load that is operated by supplying power to it while the IG is on (see, for example, Patent Document 1).

[0003] In such a system, when power is supplied to loads that operate while the IG is off, if power is supplied from the main power supply to the loads, there is a risk that the main power supply will not have enough power when the IG is turned on and begins supplying power to each load.

[0004] For this reason, it is desirable to provide a sub-power supply for supplying power during the period when the IG is off, and to supply power to the load from the sub-power supply during the period when the IG is off. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-83527 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the IG is turned on while power is being supplied to the load during the period when the IG is off, a surge may occur when the switches of the various components are switched on and off, which may lead to failure of the switches.

[0007] One aspect of the embodiment has been made in consideration of the above, and aims to provide a power supply control device and a power supply control program that can prevent switch failure even if a surge occurs when the IG is turned on to start supplying power from the main power supply to the load. [Means for solving the problem]

[0008] A power supply control device according to one aspect of an embodiment includes a first switch, a second switch, and a controller. The first switch connects a main power supply to a load. The second switch connects a sub-power supply to the load. The controller controls the on / off of the first switch and the second switch. When an ignition switch is off, the controller turns off the first switch and turns on the second switch. When the ignition switch is on, the controller turns off the second switch and then turns on the first switch. Effect of the Invention

[0009] A power supply control device and a power supply control program according to an aspect of the embodiment have an effect of preventing a switch from failing even if a surge occurs when an IG is turned on to start supplying power from a main power supply to a load. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram illustrating an example of the configuration of a power supply control device according to the first embodiment. [Diagram 2] FIG. 2 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the first embodiment. [Diagram 3] FIG. 3 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the first embodiment. [Figure 4] FIG. 4 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the first embodiment. [Diagram 5] FIG. 5 is a flowchart illustrating an example of a process executed by the controller of the power supply control device according to the first embodiment. [Figure 6] FIG. 6 is a flowchart illustrating an example of a process executed by the controller of the power supply control device according to the first embodiment. [Figure 7] FIG. 7 is a flowchart illustrating an example of a process executed by the controller of the power supply control device according to the first embodiment. [Figure 8] FIG. 8 is a flowchart illustrating an example of processing executed by the controller of the power supply control device according to the first embodiment. [Figure 9] FIG. 9 is an explanatory diagram illustrating an example of the configuration of a power supply control device according to the second embodiment. [Figure 10] FIG. 10 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the second embodiment. [Figure 11] FIG. 11 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the second embodiment. [Figure 12] FIG. 12 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the second embodiment. [Figure 13] FIG. 13 is an explanatory diagram illustrating an example of the operation of the power supply control device according to the second embodiment. [Figure 14] FIG. 14 is a flowchart illustrating an example of a process executed by a controller of the power supply control device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of a power supply control device and a power supply control method will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiment described below. The power supply control device according to the embodiment is a device that controls the supply of power to an electronic device (hereinafter referred to as a "load") mounted on a vehicle.

[0012] [1. First embodiment] [1-1. Configuration example of power supply control device according to the first embodiment] Fig. 1 is an explanatory diagram showing an example of the configuration of a power supply control device 1 according to a first embodiment. As shown in Fig. 1, 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 "IG103"), and a notification device 104.

[0013] The main power supply 10 is, for example, a lead battery mounted on a vehicle. The main power supply 10 may be a secondary battery other than a lead battery. The first load 101 is a device that operates while the IG 103 is on, and is various electronic devices related to the running of the vehicle. 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.

[0014] The second load 102 is an electronic device that can operate during the period when the IG 103 is off and during the period when the IG 103 is on, that is, all the time (including when the accessory switch is on). The second load 102 includes, for example, a drive recorder, a security device, and an in-vehicle outlet for supplying power to an external device. The notification device 104 includes a display device that displays various notification messages to the user and a sound output device that outputs the notification messages.

[0015] The power supply 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 is, for example, a lithium ion battery, but may be a secondary battery other than a lithium ion battery.

[0016] The sub-power supply 20 supplies power to the second load 102 while the IG 103 is off. The sub-power supply 20 also functions as a backup power supply that supplies power to the first load 101 and the second load 102 in place of the main power supply 10 when the main power supply 10 fails.

[0017] The first system 110 is a power supply line that supplies power from the main power supply 10 to the first load 101 and the second load 102. The second system 120 is a power supply line that supplies power from the sub-power supply 20 to the first load 101 and the second load 102.

[0018] The first switch 11 is a switch capable of connecting and disconnecting the main power supply 10 and the first system 110. The second switch 12 is a switch capable of connecting and disconnecting the sub power supply 20 and the second system 120.

[0019] 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 DC / DC (DCDC converter) that adjusts the 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 the operation.

[0020] 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.

[0021] 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.

[0022] The controller 3 includes a microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., 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 working area.

[0023] When a signal indicating that the IG 103 is turned on or a signal indicating that the IG 103 is turned off is input, the controller 3 controls the first to seventh switches 11 to 17 in response to the input signal.

[0024] Furthermore, the controller 3 monitors failures in the first system 110 and the second system 120 based on the detection results of a voltage sensor (not shown) that detects the voltage of the first system 110 and a voltage sensor that detects the voltage of the second system 120. Then, when a failure occurs in one of the systems, the controller 3 controls the first to seventh switches 11 to 17 so that power is supplied to the first load 101 and the second load 102 by the other system.

[0025] The controller 3 may be configured in part or in whole using hardware such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

[0026] [1-2. Example of operation of the power supply control device according to the first embodiment] Next, an example of operation of the power supply control device 1 according to the first embodiment will be described with reference to Figures 2 to 4. Figures 2 to 4 are explanatory diagrams showing an example of operation of the power supply control device 1 according to the first embodiment.

[0027] 2, when the vehicle is parked, that is, when the IG 103 is off, the power supply control device 1 turns off the first switch 11 and the third to sixth switches 13 to 16 and turns on the second switch 12 and the seventh switch 17 to supply power from the sub-power supply 20 to the second load 102. This allows the power supply control device 1 to operate, for example, a security device while the vehicle is parked.

[0028] Thereafter, when the IG 103 is turned on, the power supply control device 1 turns off the second switch 12 and turns on the first switch 11 and the third to seventh switches 13 to 17 to supply power from the main power supply 10 to the first load 101 and the second load 102.

[0029] However, if the power supply control device 1 turns on the first switch 11 while the second switch 12 is on immediately after the IG103 is turned on, and then turns off the second switch 12 while current is flowing through it, a surge may occur, causing the second switch 12 to fail.

[0030] Therefore, when the controller 3 detects that the IG 103 is turned on, 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 supply 10 to the first load 101 .

[0031] At this time, for example, when a signal IG-ON indicating that IG103 has been turned on is input from the vehicle as shown in FIG. 3, the controller 3 can turn off the seventh switch 17 while temporarily keeping the first switch 11 off, and then turn off the second switch 12.

[0032] As a result, when the controller 3 turns off the second switch 12, no current flows through the second switch 12, so that even if the second switch 12 is turned off, it is possible to prevent the second switch 12 from breaking down due to a surge.

[0033] 4, the controller 3 turns on the first switch 11 and the third to seventh switches 13 to 17 while keeping the second switch 12 off, and supplies power from the main power supply 10 to the first load 101 and the second load 102. This enables the power supply control device 1 to bring the vehicle into a state in which it can run.

[0034] In this example, the controller 3 turns off the seventh switch 17 before turning off the second switch 12, but this is just an example. In the power supply control device 1, if the power consumption of the second load 102 is less than a predetermined power, even if the second switch 12 is turned off while the seventh switch 17 is left on, the second switch 12 is unlikely to break down due to a surge.

[0035] Therefore, when the controller 3 detects that the IG 103 is turned on, if there is a second load 102 whose power consumption is equal to or greater than a predetermined power, the controller 3 can request the user to stop the operation of the second load 102. For example, when the controller 3 detects that the IG 103 is turned on and the user is using an external device connected to an in-vehicle outlet, the controller 3 causes the notification device 104 to output a notification message such as "Please stop the external device." Note that whether or not the power consumption of the external device is equal to or greater than a predetermined power can be determined by detecting the current flowing through the outlet included in the second load 102 using a current sensor (not shown) or the like.

[0036] As a result, when the user stops the operation of the second load 102 in response to a stop request, the power supply control device 1 can prevent the second switch 12 from failing due to a surge when the second switch 12 is later turned off in conjunction with turning on the IG 103, since no current flows through the second switch 12.

[0037] Furthermore, when the power consumption of the second load 102 falls below a predetermined power after requesting the operation to stop, the controller 3 can turn off the second switch 12 and then turn on the first switch 11. As a result, in the power supply control device 1, the current flowing through the second switch 12 has decreased at the time when the second switch 12 is turned off, so that even if the second switch 12 is turned off, a breakdown of the second switch 12 due to a surge can be prevented.

[0038] Furthermore, when a predetermined time has elapsed after the request to stop operation, the controller 3 can turn off the second switch 12 and then turn on the first switch 11. As a result, if the user stops the operation of the second load 102 in response to the stop request within the predetermined time, the power supply control device 1 can prevent the second switch 12 from breaking down due to a surge when turning off the second switch 12 and suppress delays in starting post-startup processing.

[0039] In addition, when the controller 3 detects that the IG 103 is on, if there is a second load 102 whose power consumption is equal to or greater than a predetermined power, the controller 3 can notify the user that the second load 102 will be stopped, and then after stopping the operation of the second load 102, it can turn off the second switch 12 and then turn on the first switch 11.

[0040] As a result, when the power supply control device 1 turns off the second switch 12, the second load 102 is already not operating and no current is flowing through the second switch 12, so that the power supply control device 1 can prevent the second switch 12 from breaking down due to a surge when turning off the second switch 12.

[0041] In addition, when the controller 3 detects that the IG103 is on, if there is any device in which a change due to a momentary interruption in the power supply is noticeable to the user, the controller 3 notifies the user that a change will occur, and then turns off the second switch 12 and turns on the first switch 11.

[0042] For example, when the controller 3 detects that the IG 103 is turned on, if the user is using an external device, the controller 3 causes the notification device 104 to output a notification message such as "Output will be temporarily interrupted."

[0043] This enables the power supply control device 1 to allow the user to recognize that the change in the operating state of the second load 102 accompanying the turning on of the IG 103 is not a malfunction.

[0044] [1-3. Processing Executed by the Controller According to the First Embodiment] Next, a process executed by the controller 3 of the power supply control device 1 will be described with reference to Fig. 5 to Fig. 8. Fig. 5 to Fig. 8 are flowcharts showing an example of a process executed by the controller 3 of the power supply control device 1 according to the first embodiment.

[0045] When the controller 3 detects that the IG 103 is turned off, the controller 3 executes the process shown in Fig. 5. Specifically, as shown in Fig. 5, the controller 3 first turns off the first switch 11 and turns on the second switch 12 (step S101).

[0046] At this time, the controller 3 turns off the third to sixth switches 13 to 16 while keeping the seventh switch 17 on (step S101). This allows the controller 3 to supply power from the sub-power supply 20 to the second load 102 while the IG 103 is off, thereby operating the second load 102.

[0047] After that, the controller 3 determines whether or not the IG 103 is detected to be on (step S102). If the controller 3 does not detect that the IG 103 is on (step S102, No), the controller 3 repeats the determination process of step S102 until the controller 3 detects that the IG 103 is on.

[0048] Then, when the controller 3 detects that the IG 103 is on (step S102, Yes), it maintains the first switch 11 off (step S103), and then executes a startup process (step S104). An example of the startup process will be described later with reference to Figs. 6 to 8. Then, the controller 3 executes a post-startup process (step S105).

[0049] 4, the controller 3 turns off the third switch 13, the fourth switch 14, and the sixth switch 16, and supplies power from the sub-power supply 20 to the first load 101 and the second load 102. This enables the power supply control device 1 to continue the operation of the first load 101 and the second load 102 even if a power failure occurs in the first system 110.

[0050] 4, 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. This allows the power supply control device 1 to continue the operation of the first load 101 and the second load 102 even if a power failure occurs in the second system 120.

[0051] Thereafter, the controller 3 determines whether or not it has detected that the IG103 is off (step S106). If the controller 3 determines that it has not detected that the IG103 is off (step S106, No), the controller 3 moves the process to step S105. If the controller 3 determines that it has detected that the IG103 is off (step S106, Yes), the controller 3 ends the process and restarts the process from step S101.

[0052] Furthermore, in step S104, the controller 3 executes, for example, a first startup process shown in Fig. 6. Specifically, as shown in Fig. 6, when the controller 3 starts the first startup process, first, it determines whether or not there is a second load 102 whose power consumption is equal to or greater than a predetermined power (step S201).

[0053] When the controller 3 determines 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 proceeds to step S205. When the controller 3 determines 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).

[0054] As a result, when the user stops the operation of the second load 102 in response to a stop request, the power supply control device 1 can prevent the second switch 12 from failing due to a surge when the second switch 12 is later turned off in conjunction with turning on the IG 103, since no current flows through the second switch 12.

[0055] Next, the controller 3 determines whether the power consumption of the second load 102 has decreased to less than the predetermined power (step S203). When the controller 3 determines that the power consumption of the second load 102 has decreased to less than the predetermined power (step S203, Yes), the controller 3 turns off the second switch 12 from the state shown in FIG. 4 (step S205), and then turns on the first switch 11 (step S206).

[0056] As a result, in the power supply control device 1, the current flowing through the second switch 12 has decreased when the second switch 12 is turned off, so that even if the second switch 12 is turned off, a breakdown of the second switch 12 due to a surge can be prevented.

[0057] Furthermore, following step S206, the controller 3 turns on the third to sixth switches 13 to 16 (step S207) to bring about the state shown in Fig. 4. Then, the controller 3 shifts the process to step S105 shown in Fig. 5.

[0058] Furthermore, if the controller 3 determines 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 or not a predetermined time has elapsed since the controller 3 requested the second load 102 to stop operating (step S204). If the controller 3 determines that the predetermined time has not elapsed (step S204, No), the controller 3 moves the process to step S203.

[0059] Furthermore, when the controller 3 determines that the predetermined time has elapsed (Yes at step S204), it moves the process to step S205. As a result, if the user stops the operation of the second load 102 in response to a stop request within the predetermined time, the power supply control device 1 can prevent a failure of the second switch 12 due to a surge when turning off the second switch 12 and suppress a delay in the start of post-startup processing.

[0060] Furthermore, in step S104, the controller 3 can also execute, for example, the second startup process shown in Fig. 7. Specifically, as shown in Fig. 7, when the controller 3 starts the second startup process, it first determines whether or not there is a second load 102 whose power consumption is equal to or greater than a predetermined power (step S301). If the controller 3 determines that there is no second load 102 whose power consumption is equal to or greater than the predetermined power (step S301, No), it moves the process to step S304.

[0061] Furthermore, when the controller 3 determines that there is a second load 102 whose power consumption is equal to or greater than a predetermined power (step S301, Yes), it notifies the user that the second load 102 is to be stopped (step S302), and then stops the second load 102 (step S303). After that, the controller 3 turns off the second switch 12 (step S304), turns on the first switch 11 (step S305), and turns on the third to sixth switches 13 to 16 (step S306). Then, the controller 3 moves the process to step S105 shown in FIG. 5.

[0062] As a result, when the power supply control device 1 turns off the second switch 12, the second load 102 is already not operating and no current is flowing through the second switch 12, so that the power supply control device 1 can prevent the second switch 12 from breaking down due to a surge when turning off the second switch 12.

[0063] Furthermore, in step S104, the controller 3 can also execute, for example, a third startup process shown in Fig. 8. Specifically, as shown in Fig. 8, when starting the third startup process, the controller 3 first determines whether or not there is a device whose change due to a momentary interruption in power supply is noticeable by the user (step S401).

[0064] Examples of devices in which a change due to a momentary interruption is noticeable to a user include a drive recorder with a built-in display, electronic devices that operate on power supplied from an in-vehicle outlet, and electrical appliances.

[0065] When the controller 3 determines that there is no device whose change due to a momentary interruption is noticeable by the user (step S401, No), the controller 3 proceeds to step S403. When the controller 3 determines that there is a device whose change due to a momentary interruption is noticeable by the user (step S401, Yes), the controller 3 notifies the user that there is a change in the operating state of the device being used (step S402). Then, the controller 3 turns off the second switch 12 (step S403), and then turns on the first switch 11 (step S404), turns on the third to sixth switches 13 to 16 (step S405), and proceeds to step S105 shown in FIG.

[0066] At this time, the power supply to the second load 102 is momentarily interrupted by the turning off of the second switch 12, and the operation state of the second load 102 may change due to a reduction in the supplied power. Also, when the first switch 11 is turned on to start the operation of the first load 101, the voltage of the main power supply 10 temporarily drops, and the operation state of the second load 102 may change due to a reduction in the supplied power.

[0067] Therefore, as described above, the power supply control device 1 notifies the user in advance that there is a change in the operating state of the device being used. This allows the user to recognize that the change in the operating state of the device caused by turning on the IG 103 is not due to a malfunction of the device.

[0068] [2. Second embodiment] [2-1. Configuration of the power supply control device according to the second embodiment] Next, the configuration of a power supply control device 1A according to a second embodiment will be described with reference to Fig. 9. Fig. 9 is an explanatory diagram showing an example of the configuration of the power supply control device 1A according to the second embodiment. The power supply control device 1A is mounted on an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle that runs on power supplied from a main power supply 10A shown in Fig. 9.

[0069] 9, the power supply control device 1A is connected to a main power supply 10A via a DC-DC converter (hereinafter, referred to as "DC / DC 10B"). The power supply control device 1A is also connected to a sub-power supply 20A. The power supply control device 1A is also connected to a 1-1 load 201, a 1-2 load 202, a 2-1 load 203, and a 2-2 load 204.

[0070] In addition, the power supply control device 1A is connected to the IG 10C. When the IG 10C is turned on, it outputs a start signal to the power supply control device 1A. When the IG 10C is turned off, it outputs an end signal to the power supply control device 1A.

[0071] 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 it to the power supply control device 1A.

[0072] The main power supply 10A supplies power to a motor that drives the vehicle, as well as to a 1-1 load 201, a 1-2 load 202, a 2-1 load 203, and a 2-2 load 204, via the DC / DC 10B and the power supply control device 1A.

[0073] The sub-power supply 20A includes a low-voltage battery capable of outputting a voltage lower than that 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 sub-power supply 20A supplies power to a 1-1 load 201, a 1-2 load 202, a 2-1 load 203, and a 2-2 load 204 via the power supply control device 1A.

[0074] The 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 load 204 are electric loads mounted on a vehicle. The 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 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.

[0075] Moreover, the 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 load 204 include, for example, a drive recorder, a security device, an in-vehicle outlet for supplying power to an external device, etc. In the following description, the 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 load 204 may be collectively referred to simply as a load.

[0076] In this embodiment, the 1-1 load 201 and the 1-2 load 202 are loads having the same function. Also, in this embodiment, the 2-1 load 203 and the 2-2 load 204 are loads having the same function. However, the 2-1 load 203 and the 2-2 load 204 have functions different from the 1-1 load 201 and the 1-2 load 202.

[0077] Further, the 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 load 204 each include a capacitance 5 (capacitor). The capacitance 5 smoothes and stabilizes the power supplied from the power supply control device 1A, and also stores the power.

[0078] As a result, even if the power supply from the power supply control device 1A is interrupted, the 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 load 204 can continue to operate as long as there is power stored in the capacitance 5.

[0079] 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.

[0080] Furthermore, the power supply control device 1A 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.

[0081] The first switch 21 is a switch that connects the main power supply 10A to a load. The second switch 22 is a switch that connects the sub-power supply 20A to a 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 a 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.

[0082] The third switch 23 is a switch that connects the shared wiring 100 and the 1-1 load 201. The fourth switch 24 is a switch that connects the shared wiring 100 and the 1-2 load 202. The fifth switch 25 is a switch that connects the shared wiring 100 and the 2-1 load 203. The sixth switch 26 is a switch that connects the shared wiring 100 and the 2-2 load 204.

[0083] 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 3 A. The second voltage sensor 42 detects the voltage of the connection line connecting the second switch 22 and the sub-power supply 20A, and outputs the detection result to the controller 3 A.

[0084] The third voltage sensor 43 detects the voltage of the connection line connecting the third switch 23 and the 1-1 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 load 202, and outputs the detection result to the controller 3A.

[0085] The fifth voltage sensor 45 detects the voltage of the connection line connecting the fifth switch 25 and the 2-1 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 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.

[0086] The controller 3A includes a microcomputer having a CPU, ROM, RAM, etc., 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 working area.

[0087] The controller 3A may be configured partially or entirely with hardware such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

[0088] The controller 3A electrically connects (conducts) both terminals of each of the first to sixth switches 21 to 26 by turning on each of the first to sixth switches 21 to 26. Moreover, the controller 3A electrically disconnects both terminals of each of the first to sixth switches 21 to 26 by turning off each of the first to sixth switches 21 to 26.

[0089] [2-2. Example of operation of the power supply control device according to the second embodiment] Next, an operation example of the power supply control device 1A according to the second embodiment will be described with reference to Fig. 10 to Fig. 13. Fig. 10 to Fig. 13 are explanatory diagrams showing an operation example of the power supply control device 1A according to the second embodiment.

[0090] When the vehicle is parked, that is, when the IG is off, the controller 3A turns off the first switch 21 and turns on the second switch 22, as shown in Fig. 10. Furthermore, the controller 3A turns on the third to sixth switches 23 to 26.

[0091] As a result, the 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 load 204 can continue to operate using power supplied from the sub-power supply 20A via the power supply control device 1A while the IG is off.

[0092] Thereafter, when the IG 10C is turned on and a start-up signal is input from the IG 10C, the controller 3A supplies power from the main power supply 10A to the 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 load 204.

[0093] In this case, in the state shown in FIG. 10, that is, when IG10C is turned on while power is being supplied from the sub-power supply 20A to the load, and the first switch 21 is turned on to start supplying power from the main power supply 10A to the load, a surge may occur, which may lead to a failure of the second switch 22.

[0094] Therefore, when IG10C shown in FIG. 10 is in the off state, if IG10C is turned on, the controller 3 turns off the second switch 22 as shown in FIG. 11, and then turns on the first switch 21 as shown in FIG.

[0095] As a result, when the power supply control device 1A turns on the first switch 21, the second switch 22 is already off and no current is flowing through the shared wiring 100, so even if a surge occurs when the first switch 21 is turned on, the second switch 22 can be prevented from failing.

[0096] Thereafter, the controller 3A turns on the second switch 22 as shown in Fig. 13. That is, when the IG10C turns on, the controller 3A turns off the second switch 22, turns on the first switch 21, and then turns on the second switch.

[0097] As a result, the power supply control device 1A can charge the sub-power supply 20A while preventing failure of the second switch 22 by turning on the second switch 22 again after the power supply from the main power supply 10A to the load has stabilized.

[0098] In addition, when the IG changes from off to on, the controller 3 turns off the second switch 22 and then turns on the first switch 21 at a timing that does not stop the operation of each load even if the power supply to each load is momentarily interrupted.

[0099] Specifically, when the IG10C is turned on, the controller 3A turns on the first switch 21 after turning off the second switch 22 until the time when each load can maintain its operation by the power of the capacitance 5 of the load has elapsed.

[0100] As a result, even if the power supply to each load is momentarily interrupted after the power supply control device 1A turns off the second switch 22 while keeping the first switch 21 off, the power supply control device 1A turns on the first switch 21 while the operation of each load is maintained by the power of the capacitance 5, thereby enabling the operation of each load to be maintained.

[0101] [2-3. Processing Executed by the Controller According to the Second Embodiment] Next, a process executed by the controller 3A of the power supply control device 1A will be described with reference to Fig. 14. Fig. 14 is a flow chart showing an example of a process executed by the controller 3A of the power supply control device 1A according to the second embodiment.

[0102] When the IG 10C changes from off to on, the controller 3A starts the process shown in Fig. 14. Therefore, the controller 3A starts the process shown in Fig. 14 from the state of the power supply control device 1A shown in Fig. 10, that is, the state in which the first switch 21 is off and the second to sixth switches 22 to 26 are on.

[0103] Specifically, as shown in Fig. 14, when the IG 10C is turned on, the controller 3A first judges whether or not the load is in operation (step S501). If the controller 3A judges 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). This puts the power supply control device 1A into the state shown in Fig. 11.

[0104] That is, if at least one of the 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 load 204 is operating, the controller 3A keeps the first switch 21 off and turns off the second switch 22. This enables the controller 3A to temporarily prevent current from flowing through the shared wiring 100.

[0105] Thereafter, the controller 3A shifts the process to step S503. If the controller 3A determines that the loads are not in operation (step S501, No), the controller 3A shifts the process to step S503. In other words, if all of the 1-1 load 201, the 1-2 load 202, the 2-1 load 203, and the 2-2 load 204 are not in operation, the controller 3A shifts the process to step S503.

[0106] In step S503, the controller 3A turns on the first switch 21 and maintains the second switch 22 off. If the determination in step S501 is No, the controller 3A turns the second switch 22 from on to off. This causes the power supply control device 1A to enter the state shown in FIG.

[0107] Thereafter, the controller 3A keeps the first switch 21 on and turns the second switch 22 on (step S504), and ends the process. As a result, the power supply control device 1A enters the state shown in FIG.

[0108] When charging of the sub-power supply 20A is completed, the controller 3A can also turn off the second switch 22. In this case, the controller 3A determines whether or not charging of the sub-power supply 20A is completed based on the detection result of the second voltage sensor 42.

[0109] Furthermore, after the controller 3A has completed charging of the sub-power supply 20A and turned off the second switch 22, if the amount of stored power in the sub-power supply 20A falls below a predetermined amount, the controller 3A can again turn on the second switch 22. In this case, the controller 3A determines, based on the detection result of the second voltage sensor 42, whether the amount of stored power in the sub-power supply 20A has fallen below the predetermined amount.

[0110] [2-4. Operation of the power supply control device according to the second embodiment when detecting a ground fault] When the power supply control device 1A is in the state shown in FIG. 13, that is, when 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.

[0111] 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, identifies the location of the ground fault, and performs fail-safe control to cut off the connection between the location of the ground fault and the power supply control device 1A.

[0112] The controller 3A detects the occurrence of a ground fault when the voltage detected by any of the first to seventh voltage sensors 41 to 47 becomes equal to or lower than the ground fault threshold value. Then, upon detecting the occurrence of a ground fault, the controller 3A turns off all of the third to sixth switches 23 to 26, which are load switches, while keeping the first switch 21 and the second switch 22 on.

[0113] When a ground fault occurs between the power supply control device 1A and the load, the voltages detected by the first voltage sensor 41 and the second voltage sensor 42 are restored to their original states by turning off all of the third to sixth switches 23 to 26. Therefore, if the voltage detected by the first voltage sensor 41 or the second voltage sensor 42 has returned to a value equal to or higher than the threshold voltage, the controller 3A determines that a ground fault has occurred between the power supply control device 1A and the load.

[0114] In this case, the controller 3A sequentially turns on the third to sixth switches 23 to 26 to identify the load in which a ground fault has occurred. Specifically, the controller 3A first turns on the third switch 23 (and turns off the fourth switch 24 to the sixth switch 26).

[0115] At this time, if the voltage detected by the third voltage sensor 43 (which may be the voltage detected by the first voltage sensor 41 or the second voltage sensor 42) is below the threshold value, the controller 3A determines that a ground fault has occurred between the 1-1 load 201 and the power supply control device 1A, i.e., that the 1-1 load 201 has a ground fault.

[0116] In this case, the controller 3A turns off only the third switch 23, which is closest to the 1-1 load 201 that is the ground fault location and can disconnect the load, and turns on the other switches. This allows the controller 3A to perform fail-safe control to cut off the connection between the ground fault location and the power supply control device 1A.

[0117] On the other hand, when the controller 3A turns on the third switch 23 (the fourth switch 24 to the sixth switch 26 are off), if the voltage detected by the third voltage sensor 43 returns to above the threshold value, the controller 3A determines that no ground fault has occurred between the 1-1 load 201 and the power supply control device 1A, i.e., the 1-1 load 201 is normal.

[0118] 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 determines whether or not a ground fault has occurred between the 1-2 load 202 and the power supply control device 1A, i.e., whether or not a ground fault has occurred in the 1-2 load 202. Thereafter, the controller 3A similarly turns on the fifth switch 25 and the sixth switch 26 in sequence until it can identify the load in which the ground fault has occurred, thereby identifying the load in which the ground fault has occurred.

[0119] When the controller 3A has completed identifying the load in which a ground fault has occurred, it turns off the load switch that is closest to the location of the ground fault and that can disconnect the identified load, and turns on the other load switches to perform fail-safe control.

[0120] For example, if the controller 3A identifies the ground-fault location as the 2-1 load 203 and the power supply control device 1A, it turns off the fifth switch 25, which is the load switch that is closest to the ground-fault location and can disconnect the identified load, and turns on the other load switches (the third switch 23, the fourth switch 24, and the sixth switch 26).As a result, the controller 3A disconnects the 2-1 load 203, which is the ground-fault location, and performs fail-safe control using loads other than the 2-1 load 203.

[0121] Furthermore, when the controller 3A detects the occurrence of a ground fault and turns off all of the third to sixth switches 23 to 26, which are load switches, while keeping the first switch 21 and the second switch 22 on, if the detected voltage of the first voltage sensor 41 or the second voltage sensor 42 does not return to above the threshold value, the controller 3A determines that a ground fault has occurred between the power supply control device A1 and DC / DC 10B, or between the power supply control device A1 and the sub-power supply 20A.

[0122] In this case, the controller 3A then turns off the first switch 21, turns on the second switch 22, and turns on the third to sixth switches 23 to 26. At this time, if a ground fault has occurred between the power supply control device A1 and the DC / DC 10B, the detected voltage of the first voltage sensor 41 remains below the threshold even if the first switch 21 is turned off. On the other hand, if a ground fault has not occurred between the power supply control device A1 and the DC / DC 10B, turning off the first switch 21 causes the detected voltage of the first voltage sensor 41 to return to above the threshold.

[0123] Therefore, when the controller 3A turns off the first switch 21, turns on the second switch 22, and turns on the third to sixth switches 23 to 26, if the detected voltage of the first voltage sensor 41 is equal to or lower than the threshold value, it determines that a ground fault has occurred between the power supply control device A1 and the DC / DC 10B, i.e., that a ground fault has occurred on the main power supply 10A side.

[0124] In this case, the controller 3A turns off the first switch 21, which is the switch closest to the ground fault location and capable of isolating the ground fault location, turns on the second switch 22, and turns on the third to sixth switches 23 to 26, thereby isolating the main power supply 10A side, which is the ground fault location, and performing fail-safe control using the sub-power supply 20A.

[0125] On the other hand, when the controller 3A turns off the first switch 21, turns on the second switch 22, and turns on the third to sixth switches 23 to 26, if the detected voltage of the first voltage sensor 41 returns to above the threshold value, the controller 3A determines that no ground fault has occurred between the power supply control device A1 and the DC / DC 10B, that is, the main power supply side is normal.

[0126] In this case, the controller 3A then turns off the second switch 22, turns on the first switch 21, and turns on the third to sixth switches 23 to 26, and similarly determines, based on the detected voltage of the second voltage sensor 42, whether or not a ground fault has occurred between the power supply control device A1 and the sub-power supply 20A.

[0127] When the controller 3A determines that a ground fault has occurred between the power supply control device A1 and the sub-power supply 20A, i.e., that a ground fault has occurred on the sub-power supply 20A side, it turns off the second switch 22, which is the switch closest to the ground fault location and capable of isolating the ground fault location, turns on the first switch 21, and turns on the third to sixth switches 23 to 26, thereby isolating the sub-power supply 20A side, which is the ground fault location, and performing fail-safe control using the main power supply 10A.

[0128] In this way, when the controller 3A identifies the location of the ground fault, it turns off the switch closest to the location of the ground fault among the first switch 21, the second switch 22, and the load switches (the third to sixth switches 23 to 26). In other words, the controller 3 turns off the switch that can isolate the location of the ground fault. This allows the controller 3A to isolate the location of the ground fault from the power supply control device 1A and perform fail-safe control.

[0129] [3. Notes] As an appendix, the features of the present invention are as follows: (1) a first switch connecting the main power source to the load; a second switch that connects the sub-power supply to the load; a controller that controls on / off of the first switch and the second switch; Equipped with The controller: When the ignition switch is off, the first switch is turned off and the second switch is turned on; When the ignition switch is turned on, the second switch is turned off and then the first switch is turned on. Power control device. (2) The controller: When the ignition switch is turned on, the second switch is turned off, the first switch is turned on, and then the second switch is turned on. The power supply control device according to (1) above. (3) The controller: When the ignition switch is turned on, the first switch is turned on during a period from when the second switch is turned off until a time during which the load can maintain its operation with the power capacity of the load has elapsed. The power supply control device according to (1) or (2). (4) a first system that supplies power from the main power supply to the load via the first switch; a second system that supplies the power of the sub-power supply to the load via the second switch; an inter-system switch connecting the first system and the second system; Equipped with The controller: When the ignition switch is off, the inter-system switch is turned off; When the ignition switch is turned on, the inter-system switch is turned on when the first switch is turned on. The power supply control device according to any one of (1) to (3). (5) a load switch connected between a connection line that connects the first switch and the second switch and each of the plurality of loads; Equipped with The controller: When a ground fault is detected, the location of the ground fault is identified, and the switch that is closest to the location of the ground fault among the first switch, the second switch, and the load switch is turned off. The power supply control device according to any one of (1) to (4). (6) a controller for controlling on / off of a first switch for connecting a main power supply to a load and a second switch for connecting a sub-power supply to the load; when an ignition switch is off, turning off the first switch and turning on the second switch; when the ignition switch is turned on, turning off the second switch and then turning on the first switch; A power control program that executes the following:

[0130] 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]

[0131] 1,1A Power Control Device 10,10A main power supply 10C,103IG 10B DC / DC 20,20A sub power supply 3,3A Controller 11,21 First Switch 12,22 Second switch 13,23 3rd switch 14,24 4th Switch 15,25 5th switch 16,26 6th Switch 17 7th Switch 101 1st load 102 2nd load 104 Notification device 110 1st system 120 2nd system 201 1st-1 load 202 1st-2nd load 203 2nd-1 load 204 2nd-2nd load

Claims

1. a first switch for connecting the main power supply to the load; a second switch for connecting the sub-power supply to the load; a controller that controls on / off of the first switch and the second switch; Equipped with The controller: When an ignition switch is off, the first switch is turned off and the second switch is turned on; When the ignition switch is turned on, the second switch is turned off and then the first switch is turned on. Power control device.

2. The controller: When the ignition switch is turned on, the second switch is turned off, the first switch is turned on, and then the second switch is turned on. The power supply control device according to claim 1 .

3. The controller: When the ignition switch is turned on, the first switch is turned on during a period from when the second switch is turned off until a time during which the load can maintain its operation with the power capacity of the load has elapsed. The power supply control device according to claim 1 .

4. a first system that supplies power from the main power supply to the load via the first switch; a second system that supplies the power of the sub-power supply to the load via the second switch; an inter-system switch connecting the first system and the second system; Equipped with The controller: When the ignition switch is off, the inter-system switch is turned off; When the ignition switch is turned on, the inter-system switch is turned on when the first switch is turned on. The power supply control device according to claim 1 .

5. a load switch connected between a connection line that connects the first switch and the second switch and each of the plurality of loads; Equipped with The controller: When a ground fault is detected, the location of the ground fault is identified, and the switch that is closest to the location of the ground fault among the first switch, the second switch, and the load switch is turned off. The power supply control device according to claim 1 .

6. a controller for controlling on / off of a first switch for connecting a main power supply to a load and a second switch for connecting a sub-power supply to the load; when an ignition switch is off, turning off the first switch and turning on the second switch; when the ignition switch is turned on, turning off the second switch and then turning on the first switch; A power control program that executes the following:

Images