Power supply control device

Abstract

A power supply control device (100) for a vehicle, which performs power supply control on an in-vehicle device (300, 300A), is provided with a plurality of cutoff units (S1-Sn) that cut off the flow of current exceeding a cutoff threshold to the in-vehicle device (300, 300A), and includes cutoff units (S3-S4) having different cutoff thresholds from among the plurality of cutoff units (S1-Sn), the cutoff units (S3-S4) having different cutoff thresholds from among the plurality of cutoff units (S1-Sn), and the cutoff units (S3-S4) having different cutoff thresholds from among the plurality of cutoff units (S1-Sn), the cutoff units (S1-Sn) being configured to cut off the flow of current exceeding the cutoff thresholds to the in-vehicle device (300, 300A). One group (S3-S4) of the plurality of cutting parts (S1-Sn) is connected with a new in-vehicle device (300A) which is newly connected.

Description

Technical Field

[0001] The present disclosure relates to a power supply control device assembled in a vehicle.

[0002] This application claims priority based on Japanese Application No. 2022-191571 filed on November 30, 2022, and incorporates by reference the entire contents described in the Japanese application. Background Art

[0003] Conventionally, in a vehicle, a power supply control device is interposed between a power source and in-vehicle devices, and distributes the power supplied from the power source to each in-vehicle device.

[0004] On the other hand, Patent Document 1 discloses a load control device that is interposed between a power source and a load, branches a line from the power source into a plurality of lines, and connects to the load via the plurality of branched lines as needed.

[0005] Prior Art Documents Patent Documents Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-38344 Summary of the Invention

[0006] The power supply control device according to an embodiment of the present disclosure is a power supply control device for a vehicle that controls power supply to in-vehicle devices. The power supply control device includes a plurality of cut-off units that cut off the flow of current exceeding a cut-off threshold to the in-vehicle devices. Among the plurality of cut-off units, there are cut-off units with different cut-off thresholds, and a group of the plurality of cut-off units is connected to newly connected new in-vehicle devices. Brief Description of the Drawings

[0007] Figure 1 It is a functional block diagram showing the main part structure of a vehicle equipped with the power supply control device of Embodiment 1. Figure 2 It is a functional block diagram showing the main part structure of the power supply control device of Embodiment 1. Figure 3 It is a functional block diagram showing the situation where a new in-vehicle device is connected to the available power wiring of the power supply control device of Embodiment 1. Figure 4 It is a functional block diagram showing the main part structure of the power supply control device of Embodiment 2. Detailed Description of the Invention

[0008] [Problems to be Solved by the Present Disclosure]

[0009] In the case where an in-vehicle device including an electrical device has an overcurrent flowing through it that exceeds a threshold value, there is a risk of malfunction or damage. Therefore, a cut-off unit is used to cut off the power supply when an overcurrent above the threshold value may flow to the in-vehicle device. For example, the cut-off unit is provided in the power wiring connecting the power supply and the in-vehicle device, and when a current above the threshold value flows, it functions to disconnect the power wiring.

[0010] For example, it is conceivable to add a new in-vehicle device to the load control device or replace a connected in-vehicle device with a new one. However, there may be a case where the in-vehicle device side threshold value determined according to the added or replaced new in-vehicle device is greater than the cut-off part side threshold value of the cut-off part corresponding to the above in-vehicle device. In such a case, there is a problem that the cut-off part can no longer perform the original function.

[0011] However, in Patent Document 1, such a problem is not considered and cannot be solved.

[0012] Therefore, an object thereof is to provide a power supply control device that can appropriately respond even when the threshold value of a newly added or replaced in-vehicle device is greater than the threshold value of the cut-off part of the present device.

[0013] [Effect of the present disclosure]

[0014] According to the present disclosure, a power supply control device can be provided that can respond even when the threshold value of a newly added or replaced in-vehicle device is greater than the threshold value of the cut-off part of the present device.

[0015] [Description of the embodiments of the present invention]

[0016] First, embodiments of the present disclosure will be listed and described. In addition, at least a part of the embodiments described below can be arbitrarily combined.

[0017] (1) The power supply control device according to an embodiment of the present disclosure is a power supply control device for a vehicle that performs power supply control for an in-vehicle device. The power supply control device includes a plurality of cut-off parts that cut off the flow of a current exceeding a cut-off threshold value to the in-vehicle device. Among the plurality of cut-off parts, there are cut-off parts with different cut-off threshold values, and a group of the plurality of cut-off parts is connected to a newly connected new in-vehicle device.

[0018] In the present embodiment, by connecting a group of the plurality of cut-off parts to the new in-vehicle device, it is possible to respond even when the threshold value (in-vehicle device threshold value) of the newly added or replaced new in-vehicle device is greater than the cut-off threshold value of each cut-off part of the power supply control device.

[0019] (2) Regarding the power supply control device according to an embodiment of the present disclosure, the sum of the cut-off thresholds of the set of cut-off units is the same as the in-vehicle device threshold determined according to the new in-vehicle device.

[0020] In the present embodiment, since the sum of the cut-off thresholds of the set of cut-off units connected to the new in-vehicle device is the same as the in-vehicle device threshold related to the new in-vehicle device, it is possible to cut off the flow of current exceeding the in-vehicle device threshold to the new in-vehicle device.

[0021] (3) Regarding the power supply control device according to an embodiment of the present disclosure, the set of cut-off units includes cut-off units having different cut-off thresholds.

[0022] In the present embodiment, although the cut-off thresholds of the set of cut-off units connected to the new in-vehicle device are different, the sum of the cut-off thresholds is equal to the in-vehicle device threshold related to the new in-vehicle device. Therefore, it is possible to cut off the flow of current exceeding the in-vehicle device threshold to the new in-vehicle device.

[0023] (4) Regarding the power supply control device according to an embodiment of the present disclosure, the cut-off thresholds of the set of cut-off units are the same.

[0024] In the present embodiment, the cut-off thresholds of the set of cut-off units connected to the new in-vehicle device are the same, and the sum of the cut-off thresholds is equal to the in-vehicle device threshold related to the new in-vehicle device. Therefore, it is possible to cut off the flow of current exceeding the in-vehicle device threshold to the new in-vehicle device.

[0025] (5) Regarding the power supply control device according to an embodiment of the present disclosure, the set of cut-off units are respectively connected to the new in-vehicle device in parallel.

[0026] In the present embodiment, the set of cut-off units are respectively connected to the new in-vehicle device in parallel, and the flow of current exceeding their respective cut-off thresholds to the new in-vehicle device is cut off. Therefore, it is possible to cut off the flow of current exceeding the in-vehicle device threshold to the new in-vehicle device.

[0027] (6) Regarding the power supply control device according to an embodiment of the present disclosure, each cut-off unit of the set is a semiconductor switch, the opening and closing of the semiconductor switch are controlled, each semiconductor switch switches between opening and closing based on the cut-off threshold, and the cut-off threshold is set according to the in-vehicle device threshold determined corresponding to the new in-vehicle device.

[0028] In the present embodiment, a set of semiconductor switches is connected to the new in-vehicle device, and the cut-off threshold of each semiconductor switch is set according to the in-vehicle device threshold related to the new in-vehicle device, and the opening and closing are controlled in such a way that a current exceeding each cut-off threshold does not flow to the new in-vehicle device. Therefore, the flow of a current exceeding the in-vehicle device threshold to the new in-vehicle device can be cut off.

[0029] [Details of Embodiment of the Present Invention]

[0030] Next, with reference to the drawings, a power supply control device according to an embodiment of the present disclosure will be described. In addition, the present invention is not limited to these examples and is represented by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0031] Figure 1 FIG. 10 is a functional block diagram showing the main part structure of a vehicle 500 equipped with a power supply control device 100 according to Embodiment 1. The vehicle 500 includes a plurality of in-vehicle devices 300, a power supply control device 100, and a power source 200.

[0032] The power source 200 is, for example, a storage battery, and the in-vehicle device 300 is, for example, an electrical installation device such as an interior light or a driving recorder. The power supply control device 100 is interposed between the power source 200 and the in-vehicle device 300 and controls the power supply from the power source 200 to the in-vehicle device 300.

[0033] For example, the power supply control device 100 according to Embodiment 1 includes a plurality of output terminals (not shown), and a power distribution line L is connected to each output terminal. The in-vehicle device 300 is connected to the power supply control device 100 via the power distribution line L.

[0034] The power input from the power source 200 to the power supply control device 100 is distributed and supplied to a plurality of in-vehicle devices 300 via the power distribution line L. At this time, the power supply control device 100 controls the power supply to each in-vehicle device 300 and a new in-vehicle device 300A ( Figure 3 ).

[0035] In the following description, for convenience of explanation, the case where the power supply control device 100 has n output terminals, that is, the case where n power distribution lines L (power distribution lines L1 to Ln) are connected to the power supply control device 100 will be described as an example. In addition, hereinafter, the power distribution lines L1 to Ln will also be simply referred to as the power distribution line L.

[0036] For example, in the power supply control device 100 according to Embodiment 1, the in-vehicle device 300 is connected only to a part of the power distribution lines L1 to Ln. In Figure 1 , the in-vehicle device 300 is connected only to the power distribution lines L1 to L2, and the in-vehicle device 300 is not connected to the power distribution lines L3 to Ln, and the power distribution lines L3 to Ln are available power distribution lines.

[0037] In Figure 1 this case, a situation is illustrated in which the in-vehicle device 300 is only connected to the power distribution lines L1 to L2, but it is not limited thereto. A new in-vehicle device 300 can be connected to the available power distribution line L described above, or the already connected in-vehicle device 300 can be replaced with a new in-vehicle device 300. Hereinafter, the newly added in-vehicle device 300 and the newly replaced in-vehicle device 300 in the in-vehicle device 300 are collectively referred to as the new in-vehicle device 300A.

[0038] Figure 2 is a functional block diagram showing the main part structure of the power supply control device 100 of Embodiment 1, Figure 3 is a functional block diagram showing a situation in which the new in-vehicle device 300A is connected to the available power distribution line L of the power supply control device 100 of Embodiment 1.

[0039] The power supply control device 100 includes a plurality of switches S (cut-off parts) and a control unit 10 that controls the power supply to the in-vehicle device 300 via each switch S. For example, the power supply control device 100 has n switches S (switches S1 to Sn).

[0040] The switch S is interposed between the power supply 200 and the in-vehicle device 300 (new in-vehicle device 300A).

[0041] Specifically, one end of the power distribution line connecting the power supply 200 and the power supply control device 100 is connected to the power supply 200, and the other end branches into a plurality of lines and is respectively connected to the switches S1 to Sn. In addition, the power distribution lines L1 to Ln are respectively connected to the switches S1 to Sn, and the switches S1 to Sn are respectively connected to the in-vehicle device 300 (new in-vehicle device 300A) via the power distribution lines L1 to Ln.

[0042] The switch S is, for example, a semiconductor switch configured as an IPD (Intelligent Power Device). The switch S is configured as an IPD (Intelligent Power Device) including, for example, an FET (Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor). The switch S supplies and cuts off the power (current) to the in-vehicle device 300 (new in-vehicle device 300A) via the power distribution line L. In addition, the switch S detects the current and notifies the control unit 10.

[0043] The control unit 10 is composed of a CPU (Central Processing Unit) or an MPU (MicroProcessing Unit), etc. The control unit 10 is connected to each of the switches S1 to Sn via an internal bus and a plurality of signal lines.

[0044] The control unit 10 performs PWM control by outputting (applying) a gate signal (PWM control signal) to the gate terminals of the switches S1 to Sn, thereby opening and closing the switches S1 to Sn respectively. That is, the switch S opens and closes according to the PWM control signal input from the control unit 10, and correspondingly outputs a pulse voltage (electric power) to the in-vehicle device 300 (new in-vehicle device 300A).

[0045] In Figures 2 to 3 In the illustrated power supply control device 100, the switch S1 is connected to one in-vehicle device 300 via the power distribution line L1, and the switch S2 is connected to another in-vehicle device 300 via the power distribution line L2.

[0046] The switch S including the switches S1 and S2 cuts off the flow of overcurrent to the corresponding in-vehicle device 300, and functions as a so-called fuse. Specifically, based on the threshold value (hereinafter referred to as the in-vehicle device threshold value) used for cutting off the overcurrent determined according to the above two in-vehicle devices 300, the cut-off current values (cut-off thresholds) of the switches S1 and S2 are set. When a current exceeding the above cut-off current value flows to the switches S1 and S2, the control unit 10 sets the switches S1 and S2 to the off state. The cut-off current value is the threshold value used when the switch S cuts off the power supply to the in-vehicle device 300 (new in-vehicle device 300A), and is equivalent to the fuse current value, cut-off current value, etc. in a general fuse.

[0047] For example, when there is a risk of malfunction or damage when a current greater than 10A flows to the above in-vehicle device 300, the in-vehicle device threshold value of each in-vehicle device 300 is 10A. Therefore, the cut-off current values of the switches S1 and S2 are set to 10A respectively. When a large current of 10A (cut-off current value) or more flows to the switch S1 or the switch S2, the control unit 10 sets the switch S1 or the switch S2 to the off state, and cuts off the flow of overcurrent exceeding the in-vehicle device threshold value to the in-vehicle device 300.

[0048] Consider the case where the new in-vehicle device 300A is connected to the power supply control device 100, that is, the case where a new in-vehicle device 300 is connected to the available power distribution line L or the connected in-vehicle device 300 is replaced with a new in-vehicle device 300.

[0049] On the other hand, there may be a case where the in-vehicle device threshold value related to the new in-vehicle device 300A exceeds the maximum current value at which the switch S connected to the new in-vehicle device 300A operates normally, that is, the allowable maximum current value (hereinafter referred to as the maximum allowable current value). For example, there may be a case where the in-vehicle device threshold value related to the new in-vehicle device 300A is 15A, while the maximum allowable current value in the switch S connected to the new in-vehicle device 300A is 10A. In such a case, the switch S cannot operate correctly at a current of 10A or more, so the above functions can no longer be properly achieved.

[0050] The power supply control device 100 of Embodiment 1 can address the above problems. The following is an explanation. Hereinafter, as Figure 3 shown, taking the case where the new in-vehicle device 300A is connected to the available power distribution line L as an example, it is assumed that the maximum allowable current values of the switches S1 to Sn are all 10A.

[0051] As described above, when the in-vehicle device threshold value related to the new in-vehicle device 300A is 15A and the maximum allowable current value of each switch S connected to the new in-vehicle device 300A is 10A, in the power supply control device 100 of Embodiment 1, a plurality of switches S are connected to the new in-vehicle device 300A.

[0052] For example, the switches S3 and S4 (a group) are connected to the new in-vehicle device 300A (refer to Figure 3 ). The switches S3 and S4 are respectively connected in parallel with the new in-vehicle device 300A, and the cut-off current values of the switches S3 and S4 are respectively set to 7.5A. That is, the cut-off current values of the switches S3 and S4 are set so that the sum of the cut-off current values of the switches S3 and S4 is the same as the in-vehicle device threshold value related to the new in-vehicle device 300A. As a result, the current flowing into the new in-vehicle device 300A is shunted to the switches S3 and S4 and no longer exceeds the maximum allowable current value of each of the switches S3 and S4.

[0053] After that, the control unit 10 monitors the switches S3 and S4, and when a current exceeding 7.5A (cut-off current value) flows into the switch S3 or the switch S4, it performs control to turn off the switch S3 or the switch S4 sequentially or simultaneously.

[0054] Accordingly, the flow of overcurrent exceeding 15A (the in-vehicle device threshold) to the new in-vehicle device 300A is cut off. Therefore, it has the same effect as the case where a switch S with a cut-off current value of 15A is connected to the new in-vehicle device 300A. Thus, even when the in-vehicle device threshold related to the new in-vehicle device 300A is greater than the maximum allowable current value in each switch S, the power supply control device 100 of Embodiment 1 can cope with it. Therefore, regardless of the new in-vehicle device 300A, even in the case where an unexpected new in-vehicle device 300A is connected to the power supply control device 100, power supply can be appropriately performed.

[0055] (Embodiment 2)

[0056] In Embodiment 1, the case where the cut-off part (switch S) is a semiconductor switch has been described as an example, but it is not limited thereto. In Embodiment 2, a general fuse is used as the cut-off part. The following will describe it in detail.

[0057] Figure 4 is a functional block diagram showing the main part structure of the power supply control device 100 of Embodiment 2. In Figure 4 it shows the case where the new in-vehicle device 300A is connected to the available power distribution line L of the power supply control device 100 of Embodiment 2. For ease of explanation, the new in-vehicle device 300A is represented by a dashed line.

[0058] Similar to Embodiment 1, the vehicle 500 includes a plurality of in-vehicle devices 300, a power supply control device 100, and a power source 200. The power supply control device 100 is interposed between the power source 200 and the in-vehicle device 300 (new in-vehicle device 300A) and controls the power supply from the power source 200 to the in-vehicle device 300 (new in-vehicle device 300A).

[0059] The in-vehicle device 300 (new in-vehicle device 300A) is connected to the power supply control device 100 via the power distribution line L, and the power input from the power source 200 to the power supply control device 100 is distributed and supplied to the plurality of in-vehicle devices 300 (new in-vehicle device 300A) via the power distribution line L. At this time, the power supply control device 100 controls the power supply to each in-vehicle device 300 (new in-vehicle device 300A).

[0060] In Figure 4 it illustrates the case where the in-vehicle device 300 is only connected to the power distribution lines L1 to L2, and the new in-vehicle device 300A is connected to the power distribution lines L3 to L4 among the available power distribution lines L3 to Ln.

[0061] The power supply control device 100 of Embodiment 2 includes a general vehicle fuse F instead of the switch S. For example, the power supply control device 100 has n fuses F (fuses F1 to Fn).

[0062] A fuse F is provided between a power source 200 and in-vehicle equipment 300 (new in-vehicle equipment 300A). One end of a power distribution wire connecting the power source 200 and a power supply control device 100 is connected to the power source 200, and the other end branches into a plurality of wires and is respectively connected to fuses F1 to Fn. Further, power distribution wires L1 to Ln are respectively connected to the fuses F1 to Fn, and the fuses F1 to Fn are respectively connected to the in-vehicle equipment 300 (new in-vehicle equipment 300A) via the power distribution wires L1 to Ln.

[0063] The fuse F is, for example, a general vehicle-use fuse such as a blade fuse, a low-profile fuse, or a cartridge fuse. That is, the fuse F melts when a specified fusing current flows therethrough according to its inherent fusing characteristics.

[0064] For example, in Figure 4 the example, when a current equal to or greater than the fusing current value (cut-off threshold) flows through the fuse F1 or the fuse F2, the fuse F1 or the fuse F2 melts, and the flow of an overcurrent exceeding the in-vehicle equipment threshold to the in-vehicle equipment 300 is cut off.

[0065] Consider a case where the new in-vehicle equipment 300A is connected to the power supply control device 100, that is, a case where the new in-vehicle equipment 300A is connected to an available power distribution wire L or a case where the connected in-vehicle equipment 300 is replaced with the new in-vehicle equipment 300A.

[0066] On the other hand, there may be a case where the in-vehicle equipment threshold related to the new in-vehicle equipment 300A exceeds the fusing current value of the fuse F connected to the new in-vehicle equipment 300A. For example, there may be a case where the in-vehicle equipment threshold related to the new in-vehicle equipment 300A is 15 A, while the fusing current value of the fuse F connected to the new in-vehicle equipment 300A is 7.5 A. In such a case, the fuse F can no longer function properly as a fuse.

[0067] The power supply control device 100 according to Embodiment 2 can address the above problems. The following is an explanation. For ease of explanation, the following explanation is given by taking as an example the case where the new in-vehicle equipment 300A is connected to an available power distribution wire L.

[0068] As described above, when the fusing current value of each fuse F connected to the new in-vehicle equipment 300A is less than the in-vehicle equipment threshold related to the new in-vehicle equipment 300A, in the power supply control device 100, a plurality of fuses F are connected to the new in-vehicle equipment 300A. More specifically, based on the fusing current values of the respective fuses F, a combination of a plurality of fuses F is connected to the new in-vehicle equipment 300A in a manner consistent with the in-vehicle equipment threshold determined according to the new in-vehicle equipment 300A.

[0069] For example, when the in-vehicle device threshold value determined according to the new in-vehicle device 300A is 15A, fuses F3 and F4 with fuse current values of 7.5A respectively are connected to the new in-vehicle device 300A (refer to Figure 4 ). Fuses F3 and F4 are respectively connected in parallel with the new in-vehicle device 300A.

[0070] That is, the sum of the fuse current values of fuses F3 and F4 is the same as the in-vehicle device threshold value related to the new in-vehicle device 300A. Thus, the current flowing into the new in-vehicle device 300A is shunted to fuses F3 and F4 and does not exceed the respective fuse current values of fuses F3 and F4.

[0071] Thus, the flow of overcurrent exceeding 15A (in-vehicle device threshold) to the new in-vehicle device 300A is cut off. Therefore, it has the same effect as the case of connecting a fuse F with a fuse current value of 15A to the new in-vehicle device 300A. Therefore, the power supply control device 100 of Embodiment 2 can cope even when the in-vehicle device threshold value related to the new in-vehicle device 300A is greater than the fuse current value in each fuse F. Therefore, regardless of the new in-vehicle device 300A, even in the case of connecting an unexpected new in-vehicle device 300A to the power supply control device 100, power supply can be appropriately performed.

[0072] In Embodiment 1, the case of connecting a combination of two switches S (switches S3 and S4) to the new in-vehicle device 300A was taken as an example for description. In Embodiment 2, the case of connecting a combination of two fuses F (fuses F3 and F4) to the new in-vehicle device 300A was taken as an example for description, but it is not limited thereto. For example, a combination of three or more switches S or fuses F can also be combined and connected to the new in-vehicle device 300A.

[0073] In addition, in Embodiment 1, the case where the cut-off current values of the respective switches S related to the combination of switches S connected to the new in-vehicle device 300A are the same (both 7.5A) was taken as an example for description. In Embodiment 2, the case where the fuse current values of the respective fuses F related to the combination of fuses F connected to the new in-vehicle device 300A are the same (both 7.5A) was taken as an example for description, but it is not limited thereto. The cut-off current values of the respective switches S related to the combination can also be different cut-off current values (for example, 10A and 5A), and the fuse current values of the respective fuses F related to the combination can also be different fuse current values (for example, 10A and 5A).

[0074] Further, in Embodiment 1, the case where the power supply control device 100 only has the switch S is taken as an example for description, and in Embodiment 2, the case where the power supply control device 100 only has the fuse F is taken as an example for description, but it is not limited thereto. The power supply control device 100 may also be configured to have both the switch S and the fuse F.

[0075] It should be considered that the embodiments disclosed this time are examples in all aspects and are not restrictive. The scope of the present invention is represented not by the above meaning but by the claims, and is intended to include all changes within the meaning equivalent to the claims and within the scope.

[0076] The matters described in each embodiment can be combined with each other. In addition, the independent claims and dependent claims described in the claims can be combined with each other in all combinations regardless of the citation form. Further, in the claims, the form of a claim that cites two or more other claims (multiple dependent claim form) is used, but it is not limited thereto. The form of a multiple dependent claim that cites at least one multiple dependent claim (multiple dependent claim citing multiple dependent claims) may also be used for description.

[0077] Reference Signs Explanation 10 Control Unit 100 Power Supply Control Device 200 Power Source 300 Vehicle Equipment 300A New Vehicle Equipment 500 Vehicle F, F1 to Fn Fuses (Cut-off Parts) L, L1 to Ln Power Wires S, S1 to Sn Switches (Cut-off Parts).

Claims

1. A power supply control device, which is a power supply control device for a vehicle and performs power supply control for in-vehicle equipment. Among them, The power supply control device includes a plurality of cut-off parts, and the plurality of cut-off parts cut off the flow of current exceeding the cut-off threshold to the in-vehicle equipment. Among the plurality of cut-off parts, there are cut-off parts with different cut-off thresholds. A group of the plurality of cut-off parts is connected to newly connected new in-vehicle equipment.

2. The power supply control device according to claim 1, Among them, The sum of the cut-off thresholds of the group of cut-off parts is the same as the in-vehicle equipment threshold determined according to the new in-vehicle equipment.

3. The power supply control device according to claim 2, Among them, The group of cut-off parts includes cut-off parts with different cut-off thresholds.

4. The power supply control device according to claim 2, Among them, The cut-off thresholds of the group of cut-off parts are the same.

5. The power supply control device according to claim 2, Among them, The group of cut-off parts is respectively connected to the new in-vehicle equipment in parallel.

6. The power supply control device according to any one of claims 1 to 5, Among them, Each cut-off part of the group is a semiconductor switch, and the opening and closing of the semiconductor switch are controlled. Each semiconductor switch switches between opening and closing based on the cut-off threshold, and the cut-off threshold is set according to the in-vehicle equipment threshold determined corresponding to the new in-vehicle equipment.

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