Vehicle-mounted switching device

Abstract

The series switch is connected between the cathode of the first battery and the anode of the second battery. The first parallel switch is connected between the cathode of the second battery and a point between the series switch and the cathode of the first battery. The second parallel switch is connected between the positive electrode of the first battery and a point between the series switch and the positive electrode of the second battery. A first thermal fuse is connected between the cathode of the first battery and a point between the series switch and the first parallel switch. A second thermal fuse is connected between the positive electrode of the second battery and a point between the series switch and the second parallel switch.

Description

Technical Field

[0001] This disclosure relates to an on-board switching device. Background Technology

[0002] In related technologies, an on-board switching device capable of switching between a first battery and a second battery in a series connection state and a parallel connection state has been proposed (Patent Document 1). In the on-board switching device according to Patent Document 1, a thermal fuse is provided between the negative terminal of the first battery and the positive terminal of the second battery, and the thermal fuse is cut off when an overcurrent flows through it.

[0003] When the thermal fuse trips, the power supply from the first and second batteries to the load is cut off. Therefore, the problem is that even when one of the first and second batteries is still capable of supplying power, the power supply to the load stops, failing to achieve redundancy.

[0004] Reference List

[0005] Patent documents

[0006] Patent Document 1: JP2022-170763A Summary of the Invention

[0007] This disclosure is made in view of the above circumstances, and its purpose is to provide an on-board switching device with improved redundancy.

[0008] To achieve the above objectives, the vehicle-mounted switching device according to this disclosure has the following features. The vehicle-mounted switching device includes: a series switch configured to connect between the negative terminal of a first battery and the positive terminal of a second battery; a first parallel switch configured to connect between the negative terminal of the second battery and the point between the series switch and the negative terminal of the first battery; a second parallel switch configured to connect between the positive terminal of the first battery and the point between the series switch and the positive terminal of the second battery; a first thermal fuse configured to connect between the negative terminal of the first battery and the point between the series switch and the first parallel switch; and a second thermal fuse configured to connect between the positive terminal of the second battery and the point between the series switch and the second parallel switch.

[0009] According to the vehicle-mounted switching device disclosed herein, the effect of improving redundancy can be achieved.

[0010] The present disclosure has been briefly described above. Furthermore, the details of the present disclosure will become clear from the following description of embodiments for carrying out the invention (hereinafter referred to as "Embodiments") with reference to the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a circuit diagram illustrating an embodiment of an on-board power supply system, including an on-board switching device according to the present disclosure.

[0012] Figure 2 It shows Figure 1 The configuration of the thermal fuse is shown.

[0013] Figure 3 This is shown in the first embodiment. Figure 1 The flowchart shown is a process flow diagram of the control unit.

[0014] Figure 4 This is shown in the second embodiment. Figure 1 The flowchart shown is a process flow diagram of the control unit.

[0015] Figure 5A and Figure 5B These are explanatory diagrams; each diagram illustrates... Figure 1 The threshold under overcurrent conditions is given when each of the first current sensor 21 and the second current sensor includes a shunt resistor type current sensor and a Hall type current sensor. Detailed Implementation

[0016] Specific embodiments according to this disclosure will now be described with reference to the accompanying drawings.

[0017] (First Embodiment)

[0018] The vehicle-mounted switching device 1 of the first embodiment will be described. Figure 1 This is a circuit diagram illustrating an embodiment of an on-board power supply system 100, including an on-board switching device according to the present disclosure. The on-board power supply system 100 includes a load R (e.g., a motor driving the wheels), a first battery 101 and a second battery 102 supplying power to the load R, an external power source 103 charging the first battery 101 and the second battery 102, and an on-board switching device 1 for switching the first battery 101 and the second battery 102 between a series connection state and a parallel connection state.

[0019] The on-board switching device 1 includes a high-potential side switch S11, a low-potential side switch S12, a high-potential side power supply switch S21, a low-potential side power supply switch S22, a bypass switch S3, and a resistor r1. Figure 1 The switches S11, S12, S21, S22 and S3 shown are made of mechanical relays, but they can also be made of semiconductor switches such as MOSFETs.

[0020] The high-potential side switch S11 and the low-potential side switch S12 are respectively used to turn on and off the power supply from the first battery 101 and the second battery 102 to the load R. The high-potential side switch S11 is connected between terminal T11, which is connected to one end of the load R, and terminal T21, which is connected to the positive terminal of the first battery 101. The low-potential side switch S12 is connected between terminal T12, which is connected to the other end of the load R, and terminal T32, which is connected to the negative terminal of the second battery 102.

[0021] The high-potential side power supply switch S21 and the low-potential side power supply switch S22 are respectively switches for turning on and off the charging of the first battery 101 and the second battery 102 from the external power supply 103. The high-potential side power supply switch S21 is connected between the connection points of terminals T41 and T11, which are connected to one end of the external power supply 103, and the high-potential side switch S11. The low-potential side power supply switch S22 is connected between the connection points of terminals T42 and T12, which are connected to the other end of the external power supply 103, and the low-potential side switch S12.

[0022] Bypass switch S3 is used to bypass the high-potential side switch S11 and connect resistor r1. Bypass switch S3 and resistor r1 are connected in parallel with high-potential side switch S11.

[0023] The vehicle-mounted switching device 1 includes a series switch S5, a first parallel switch S61, a second parallel switch S62, a first thermal fuse H1, a second thermal fuse H2, and a central thermal fuse HS. Figure 1 The switches S5, S61 and S62 shown are made of mechanical relays, but they can also be made of semiconductor switches such as MOSFETs.

[0024] A series switch S5 is connected between terminal T22, which is connected to the negative terminal of the first battery 101, and terminal T31, which is connected to the positive terminal of the second battery 102. A first parallel switch S61 is connected between terminal T32, which is connected to the negative terminal of the second battery 102, and between the series switch S5 and terminal T22, which is connected to the negative terminal of the first battery 101. A second parallel switch S62 is connected between terminal T21, which is connected to the positive terminal of the first battery 101, and between the series switch S5 and terminal T31, which is connected to the positive terminal of the second battery 102.

[0025] When the series switch S5 is closed and the first parallel switch S61 and the second parallel switch S62 are open, the first battery 101 and the second battery 102 are connected in series. When the first parallel switch S61 and the second parallel switch S62 are closed and the series switch S5 is open, the first battery 101 and the second battery 102 are connected in parallel. The series switch S5, the first parallel switch S61, and the second parallel switch S62 are controlled to be turned on and off by the control unit 3, which will be described later.

[0026] like Figure 2 As shown, each thermal fuse H1, H2, and HS includes a sheet conductor 10, an igniter 11, and a cut-off device 12. The sheet conductor 10 is connected in a path and has a notch. The igniter 11 ignites the propellant in response to an input ignition signal from the control unit 3, which will be described later. The cut-off device 12 is pressed against the sheet conductor 10 by the pressure generated by the ignited propellant and cuts off the notch in the sheet conductor 10.

[0027] The first thermal fuse H1 is connected between terminal T22, which is connected to the negative terminal of the first battery 101, and the point between the series switch S5 and the first parallel switch S61. The second thermal fuse H2 is connected between terminal T31, which is connected to the positive terminal of the second battery 102, and the point between the series switch S5 and the second parallel switch S62.

[0028] The central thermal fuse HS is connected in series with the series switch S5 between the first thermal fuse H1 and the second thermal fuse H2.

[0029] The on-board switching device 1 includes a first current sensor 21, a second current sensor 22, and a control unit 3. The first current sensor 21 is connected in series with a first thermal fuse H1 between terminal T22, which is connected to the negative terminal of the first battery 101, and a point between the first parallel switch S61 and a series circuit including a series switch S5 and a central thermal fuse HS. In this embodiment, the first current sensor 21 is connected closer to terminal T22 than the first thermal fuse H1, but it can also be connected closer to the first parallel switch S61 than the first thermal fuse H1.

[0030] The second current sensor 22 is connected in series with the second thermal fuse H2 between terminal T31, which is connected to the positive terminal of the second battery 102, and point, which is between the second parallel switch S62 and the series circuit including the series switch S5 and the central thermal fuse HS. In this embodiment, the second current sensor 22 is connected closer to terminal T31 than the second thermal fuse H2, but it can also be connected closer to the second parallel switch S62 than the first thermal fuse H1.

[0031] Each of the first current sensor 21 and the second current sensor 22 may include a shunt resistor type current sensor using a shunt resistor, or may include a Hall type current sensor using a Hall element. Each of the first current sensor 21 and the second current sensor 22 may include both a shunt resistor type current sensor and a Hall type current sensor.

[0032] The control unit 3 includes, for example, a microcomputer, and outputs ignition signals to the central thermal fuse HS, the first thermal fuse H1, and the second thermal fuse H2 based on the detection values ​​of the first current sensor 21 and the second current sensor 22 to control the cut-off.

[0033] Next, we will refer to Figure 3 The flowchart describes the operation of the vehicle switching device 1 with the above configuration. The control unit 3 starts operating in response to the ignition switch being turned on. First, the control unit 3 determines whether the first battery 101 and the second battery 102 are in series connection (Sp1). If the control unit 3 determines that the series switch S5 is on, the first parallel switch S61 and the second parallel switch S62 are off, and determines that the first battery 101 and the second battery 102 are in series connection (Sp1 is Y), then the control unit 3 determines whether the detection value of at least one of the first current sensor 21 and the second current sensor 22 indicates an overcurrent state (Sp2).

[0034] If the detection value of at least one of the first current sensor 21 and the second current sensor 22 does not indicate an overcurrent state (Sp2 is N), the control unit 3 returns to Sp2 and repeats the determination in Sp2.

[0035] Simultaneously, if only the detection value of the first current sensor 21 indicates an overcurrent state while the detection value of the second current sensor 22 does not indicate an overcurrent state (Sp3 is Y), then the control unit 3 proceeds to Sp5. When processing progresses from Sp3 to Sp5, the control unit 3 outputs an ignition signal (Sp5) to the first thermal fuse H1 corresponding to the first current sensor 21 and ends the processing. For example, when Figure 1 When paths R1 and R2 are short-circuited, only the detection value of the first current sensor 21 indicates an overcurrent condition, and the overcurrent can be interrupted by cutting off the first thermal fuse H1. Path R1 is the path between the first thermal fuse H1 and the series switch S5. Path R2 is the path between the second parallel switch S62 and terminal T21. When paths R1 and R2 are short-circuited, the overcurrent cannot be interrupted even if the central thermal fuse HS is cut off.

[0036] If only the detection value of the second current sensor 22 indicates an overcurrent condition, and the detection value of the first current sensor 21 does not indicate an overcurrent condition (Sp3 is N, Sp4 is Y), then the control unit 3 proceeds to Sp5. When processing progresses from Sp4 to Sp5, the control unit 3 outputs an ignition signal (Sp5) to the second thermal fuse H2 corresponding to the second current sensor 22 and ends the processing. For example, when Figure 1 When paths R3 and R4 are short-circuited, only the detection value of the second current sensor 22 indicates an overcurrent condition, and the overcurrent can be interrupted by cutting off the second thermal fuse H2. Path R3 is the path between the second thermal fuse H2 and the series switch S5. Path R4 is the path between the first parallel switch S61 and terminal T32. When paths R3 and R4 are short-circuited, the overcurrent cannot be interrupted even if the central thermal fuse HS is cut off.

[0037] If the detection values ​​of the first current sensor 21 and the second current sensor 22 indicate an overcurrent condition (Sp4 is N), the control unit 3 outputs an ignition signal (Sp6) to the central thermal fuse HS and terminates the process. For example, when paths R2 and R4, terminals T11 and T12, and terminals T41 and T42 are short-circuited, the detection values ​​of the first current sensor 21 and the second current sensor 22 indicate an overcurrent condition, and the overcurrent can be interrupted by cutting off the central thermal fuse HS.

[0038] Simultaneously, if the control unit 3 determines that the series switch S5 is open, the first parallel switch S61 and the second parallel switch S62 are closed, and determines that the first battery 101 and the second battery 102 are in a parallel connection state (N in Sp1), then the control unit 3 does not disconnect the central thermal fuse HS (suspend) (Sp7). Next, the control unit 3 determines whether the detection value of at least one of the first current sensor 21 and the second current sensor 22 indicates an overcurrent state (Sp8).

[0039] Then, when the detection value of the first current sensor 21 indicates an overcurrent condition, the control unit 3 outputs an ignition signal to the first thermal fuse H1, and when the detection value of the second current sensor 22 indicates an overcurrent condition, the control unit 3 outputs an ignition signal to the second thermal fuse H2 (Sp9). Sp9 is described in detail as follows: when only the detection value of the first current sensor 21 indicates an overcurrent condition while the detection value of the second current sensor 22 does not indicate an overcurrent condition, the control unit 3 only disconnects the first thermal fuse H1 without disconnecting the second thermal fuse H2.

[0040] As described above, when paths R1 and R2 are short-circuited, only the detection value of the first current sensor 21 indicates an overcurrent condition, and the overcurrent can be interrupted by cutting off the first thermal fuse H1. Furthermore, since the second thermal fuse H2 is not cut off, it is possible to continue supplying power to the load R solely from the second battery 102 and to continue charging from the external power source 103.

[0041] Detailed description of Sp9: When only the detection value of the second current sensor 22 indicates an overcurrent condition and the detection value of the first current sensor 21 does not indicate an overcurrent condition, the control unit 3 disconnects only the second thermal fuse H2 without disconnecting the first thermal fuse H1. As described above, when paths R3 and R4 are short-circuited, only the detection value of the second current sensor 22 indicates an overcurrent condition, and the overcurrent can be interrupted by disconnecting the second thermal fuse H2. Furthermore, since the first thermal fuse H1 is not disconnected, it is possible to continue supplying power to the load R solely from the first battery 101 and to continue charging from the external power source 103.

[0042] In Sp9, when both the first current sensor 21 and the second current sensor 22 indicate an overcurrent condition, the control unit 3 outputs ignition signals to the first thermal fuse H1 and the second thermal fuse H2. Afterward, if the power-on process ends (Sp10 is Y), the control unit 3 terminates the process. If the power-on process does not end (Sp10 is N), the control unit 3 returns to Sp8.

[0043] According to the above embodiments, by providing a first thermal fuse H1 and a second thermal fuse H2, overcurrent caused by short circuits that cannot be handled by interrupting the central thermal fuse HS can be reduced, such as short circuits between paths R1 and R2 and short circuits between paths R3 and R4. When one of the first battery 101 and the second battery 102 is short-circuited while the other is normal, the normal one of the first battery 101 and the second battery 102 can continue to supply power or be charged, and redundancy can be improved.

[0044] (Second Embodiment)

[0045] Next, the vehicle-mounted switching device 1 according to the second embodiment will be described. The vehicle-mounted switching device 1 according to the second embodiment has the same configuration as that in the first embodiment, so its detailed description will be omitted here.

[0046] Reference Figure 4 The operation of the second embodiment is described. Figure 4 In this context, the same reference numerals are assigned to those already described in the first embodiment. Figure 3 The same operational parts are shown in the flowchart, and their detailed descriptions will be omitted. Control unit 3 begins operation in response to the ignition switch being turned on. First, control unit 3 determines whether the first battery 101 and the second battery 102 are connected in series (Sp1). If control unit 3 determines that the first battery 101 and the second battery 102 are connected in series (Y in Sp1), then control unit 3 does not disconnect the first thermal fuse H1 and the second thermal fuse H2 (pause) (SP12).

[0047] Next, the control unit 3 determines whether the detection value of at least one of the first current sensor 21 and the second current sensor 22 indicates an overcurrent state (Sp13). If the detection value of at least one of the first current sensor 21 and the second current sensor 22 indicates an overcurrent state (Y in Sp13), the control unit 3 outputs an ignition signal to the central thermal fuse HS (Sp6) and ends the process. If the control unit 3 determines that the first battery 101 and the second battery 102 are in a parallel connection state (N in Sp1), the control unit 3 proceeds to Sp7 to Sp10 as in the first embodiment.

[0048] If the short circuits between paths R1 and R2 and between paths R3 and R4 can be reduced by thickening or separating the insulation material between paths R1 and R2 and between paths R3 and R4, then control unit 3 can... Figure 4 The operation is shown. In the second embodiment described above, as in the first embodiment, when one of the first battery 101 and the second battery 102 is short-circuited while the other is normal, the normal one of the first battery 101 and the second battery 102 can continue to supply power or be charged, and the redundancy can be improved.

[0049] Next, the determination of the overcurrent state will be described in the case where each of the first current sensor 21 and the second current sensor 22 includes a shunt resistor type current sensor and a Hall type current sensor. When at least one of the detection values ​​of the shunt resistor type current sensor and the Hall type current sensor exceeds a threshold, the control unit 3 can determine that the detection values ​​of the first current sensor 21 and the second current sensor 22 indicate an overcurrent state (OR determination). When both the detection values ​​of the shunt resistor type current sensor and the Hall type current sensor exceed the threshold, the control unit 3 can determine that the detection values ​​of the first current sensor 21 and the second current sensor 22 indicate an overcurrent state (AND determination).

[0050] The control unit 3 can use OR and AND decisions based on whether the connection is in series or parallel. As mentioned above, there is no redundancy in the series connection state, but there is redundancy in the parallel connection state. Therefore, for example, the control unit 3 preferably performs AND decisions in the series connection state and OR decisions in the parallel connection state, but this disclosure is not limited thereto.

[0051] When the average value of the detection value of the shunt resistor current sensor and the detection value of the Hall current sensor exceeds the threshold, the control unit 3 can determine that the detection values ​​of the first current sensor 21 and the second current sensor 22 indicate an overcurrent state (average value determination).

[0052] Reference Figure 5A and Figure 5B The threshold for describing the overcurrent state in the case of each of the first current sensor 21 and the second current sensor 22, including a shunt resistor type current sensor and a Hall type current sensor. Figure 5A and Figure 5B These are graphs, each showing the distribution of changes when the detected values ​​of the Hall-type current sensor and the shunt resistor current sensor are at the threshold. For example... Figure 5A and Figure 5B As shown, the detected values ​​of Hall effect current sensors typically have a larger range of variation than those of current-resistive current sensors.

[0053] like Figure 5A As shown, when performing an AND decision, a threshold is set so that the upper limit of the change in the detection value of the Hall-type current sensor when the threshold is reached is equal to or lower than the upper limit of the change in the detection value of the shunt resistor-type current sensor when the threshold is reached. Figure 5A In the case shown, the threshold value for the shunt resistor current sensor is set to 2000A, and the threshold value for the Hall effect current sensor is set to 1700A. Therefore, overcurrent conditions can be accurately detected.

[0054] like Figure 5B As shown, when performing OR determination, a threshold is set such that the lower limit of the change in the detection value of the Hall-type current sensor when the detection value is at the threshold is equal to or higher than the lower limit of the change in the detection value of the shunt resistor-type current sensor when the detection value is at the threshold. Figure 5B In the case shown, the threshold value for the shunt resistor current sensor is set to 2000A, and the threshold value for the Hall effect current sensor is set to 2300A. Therefore, overcurrent conditions can be accurately detected.

[0055] This disclosure is not limited to the above embodiments, and appropriate modifications and improvements can be made. Furthermore, as long as this disclosure can be implemented, the material, shape, size, quantity, and arrangement of the components in the above embodiments can be freely selected without restriction.

[0056] Hereinafter, the features of embodiments of the vehicle switching device according to the present disclosure are briefly summarized and listed in [1] to [6].

[0057] [1] A vehicle-mounted switching device (1) includes:

[0058] A series switch (S5) is configured to be connected between the negative terminal of the first battery (101) and the positive terminal of the second battery (102);

[0059] The first parallel switch (S61) is configured to connect between the negative terminal of the second battery (102) and the point between the series switch (S5) and the negative terminal of the first battery (101).

[0060] The second parallel switch (S62) is configured to connect between the positive terminal of the first battery (101) and the point between the series switch (S5) and the positive terminal of the second battery (102);

[0061] A first thermal fuse (H1) is configured to connect between the negative terminal of the first battery (101) and the point between the series switch (S5) and the first parallel switch (S61); and

[0062] The second thermal fuse (H2) is configured to be connected between the positive terminal of the second battery (102) and the point between the series switch (S5) and the second parallel switch (S62).

[0063] According to the vehicle switching device (1) with the above configuration [1], by providing a first thermal fuse (H1) and a second thermal fuse (H2), when one of the first battery (101) and the second battery (102) is short-circuited while the other is normal, the normal one of the first battery (101) and the second battery (102) can continue to supply power or be charged, and the redundancy can be improved.

[0064] [2] The vehicle-mounted switching device (1) according to [1] further includes:

[0065] A central thermal fuse (HS) is configured to be connected in series with a series switch (S5) between a first thermal fuse (H1) and a second thermal fuse (H2).

[0066] According to the vehicle switching device (1) configured as described above [2], by setting a central thermal fuse (HS), when the first battery (101) and the second battery (102) are in a series connection state, the overcurrent can be reduced by cutting off the central thermal fuse (HS) without cutting off the first thermal fuse (H1) and the second thermal fuse (H2).

[0067] [3] The vehicle-mounted switching device (1) according to [2] further includes:

[0068] A first current sensor (21) is configured to be connected in series with a first thermal fuse (H1) between the negative terminal of the first battery (101) and the point between the first parallel switch (S61) and the series circuit including the series switch (S5) and the central thermal fuse (HS).

[0069] A second current sensor (22) is configured to be connected in series with a second thermal fuse (H2) between the positive terminal of the second battery (102) and the point between the second parallel switch (S62) and the point between the parallel switch (S5) and the series circuit including the series switch (S5) and the central thermal fuse (HS); and

[0070] The control unit (3) is configured to control the cutting off of the central thermal fuse (HS), the first thermal fuse (H1) and the second thermal fuse (H2) based on the detection values ​​of the first current sensor (21) and the second current sensor (22).

[0071] According to the on-board switching device (1) with the above-described [3] configuration, the central thermal fuse (HS), the first thermal fuse (H1), and the second thermal fuse (H2) are controlled to be cut off based on the detection values ​​of the first current sensor (21) and the second current sensor (22). Thus, appropriate portions of the central thermal fuse (HS), the first thermal fuse (H1), and the second thermal fuse (H2) can be cut off based on the short-circuit portion.

[0072] [4] According to the vehicle-mounted switching device (1) described in [3], wherein

[0073] The control unit

[0074] When the series switch (51) is closed, if only the detection value of the first current sensor (21) indicates an overcurrent condition, the first thermal fuse (H1) is cut off; if only the detection value of the second current sensor (22) indicates an overcurrent condition, the second thermal fuse (H2) is cut off; and if the detection values ​​of both the first current sensor (21) and the second current sensor (22) indicate an overcurrent condition, the central thermal fuse (HS) is cut off.

[0075] When the first parallel switch (S61) and the second parallel switch (S62) are connected, the first thermal fuse (H1) is disconnected when the detection value of the first current sensor (21) indicates an overcurrent condition, the second thermal fuse (H2) is disconnected when the detection value of the second current sensor (22) indicates an overcurrent condition, and the central thermal fuse (HS) is not disconnected.

[0076] According to the vehicle-mounted switching device (1) with the above-described [4] configuration, appropriate portions of the central thermal fuse (HS), the first thermal fuse (H1), and the second thermal fuse (H2) can be cut off based on the short-circuit portion. In the case of parallel connection, when one of the first battery (101) and the second battery (102) is short-circuited while the other is normal, the normal one of the first battery (101) and the second battery (102) can continue to supply power or be charged.

[0077] [5] According to the vehicle-mounted switching device (1) described in [3], wherein

[0078] The control unit (3)

[0079] When the series switch (S5) is closed, if the detection value of at least one of the first current sensor (21) and the second current sensor (22) indicates an overcurrent condition, the central thermal fuse (HS) is disconnected, but the first thermal fuse (H1) and the second thermal fuse (H2) are not disconnected.

[0080] When the first parallel switch (S61) and the second parallel switch (S62) are turned on, the first thermal fuse (H1) is cut off when the detection value of the first current sensor (21) indicates an overcurrent state, the second thermal fuse (H2) is cut off when the detection value of the second current sensor (22) indicates an overcurrent state, and the central thermal fuse (HS) is not cut off.

[0081] According to the vehicle switching device (1) with the above configuration [5], in the case of series connection, overcurrent can be easily reduced by simply cutting off the central thermal fuse (HS). In the case of parallel connection, when one of the first battery (101) and the second battery (102) is short-circuited while the other is normal, the normal one of the first battery (101) and the second battery (102) can continue to supply power or charge.

[0082] [6] According to the vehicle-mounted switching device (1) described in [3], wherein

[0083] Each of the first current sensor (21) and the second current sensor (22) includes a resistive current sensor and a Hall effect current sensor.

[0084] The control unit (3)

[0085] When the series switch (S5) is closed, if the detection values ​​of both the resistive current sensor and the Hall current sensor indicate an overcurrent condition, it is determined that the detection value of either the first current sensor (21) or the second current sensor (22), which includes both the resistive current sensor and the Hall current sensor, indicates an overcurrent condition.

[0086] When the first parallel switch (S61) and the second parallel switch (S62) are turned on, if at least one of the detection values ​​of the resistive current sensor and the Hall current sensor indicates an overcurrent state, it is determined that the detection value of the first current sensor (21) or the second current sensor (22), which includes the resistive current sensor and the Hall current sensor, indicates an overcurrent state.

[0087] According to the vehicle-mounted switching device (1) with the above [6] configuration, in the non-redundant series connection state, the overcurrent state can be determined by performing an AND decision on the sensing resistive current sensor and the Hall current sensor, and in the redundant parallel connection state, the overcurrent state can be determined by performing an OR decision on the sensing resistive current sensor and the Hall current sensor.

Claims

1. An on-board switching device, comprising: A series switch is configured to be connected between the negative terminal of the first battery and the positive terminal of the second battery. A first parallel switch is configured to be connected between the negative terminal of the second battery and the point between the series switch and the negative terminal of the first battery; A second parallel switch is configured to be connected between the positive terminal of the first battery and the point between the series switch and the positive terminal of the second battery; A first thermal fuse is configured to be connected between the negative terminal of the first battery and the point between the series switch and the first parallel switch; as well as A second thermal fuse is configured to be connected between the positive terminal of the second battery and the point between the series switch and the second parallel switch.

2. The vehicle-mounted switching device according to claim 1 further includes: A central thermal fuse is configured to be connected in series with the series switch between the first thermal fuse and the second thermal fuse.

3. The vehicle-mounted switch device according to claim 2, further comprising: A first current sensor is configured to be connected in series with the first thermal fuse between the negative terminal of the first battery and the point between the first parallel switch and the series circuit, the series circuit including the series switch and the central thermal fuse. A second current sensor is configured to be connected in series with the second thermal fuse between the positive terminal of the second battery and the point between the second parallel switch and the series circuit, the series circuit including the series switch and the central thermal fuse; as well as The control unit is configured to control the cutting off of the central thermal fuse, the first thermal fuse, and the second thermal fuse based on the detection values ​​of the first current sensor and the second current sensor.

4. The vehicle-mounted switching device according to claim 3, wherein... When the series switch is on, the control unit disconnects the first thermal fuse when only the detection value of the first current sensor indicates an overcurrent condition, disconnects the second thermal fuse when only the detection value of the second current sensor indicates an overcurrent condition, and disconnects the central thermal fuse when both the detection values ​​of the first and second current sensors indicate an overcurrent condition. When the first parallel switch and the second parallel switch are connected, the control unit cuts off the first thermal fuse when the detection value of the first current sensor indicates the overcurrent state, cuts off the second thermal fuse when the detection value of the second current sensor indicates the overcurrent state, and does not cut off the central thermal fuse.

5. The vehicle-mounted switching device according to claim 3, wherein... When the series switch is closed, the control unit disconnects the central thermal fuse when the detection value of at least one of the first current sensor and the second current sensor indicates an overcurrent condition, but does not disconnect the first thermal fuse and the second thermal fuse. When the first parallel switch and the second parallel switch are connected, the control unit cuts off the first thermal fuse when the detection value of the first current sensor indicates the overcurrent state, cuts off the second thermal fuse when the detection value of the second current sensor indicates the overcurrent state, and does not cut off the central thermal fuse.

6. The vehicle-mounted switching device according to claim 3, wherein... Each of the first current sensor and the second current sensor includes a resistive current sensor and a Hall effect current sensor. When the series switch is turned on, if both the resistive current sensor and the Hall-effect current sensor indicate an overcurrent condition, the control unit determines that the detection value of either the first current sensor or the second current sensor, including the resistive current sensor and the Hall-effect current sensor, indicates the overcurrent condition. When the first parallel switch and the second parallel switch are turned on, and at least one of the detection values ​​of the sensing resistive current sensor and the Hall-type current sensor indicates the overcurrent state, the control unit determines that the detection value of the first current sensor or the second current sensor, including the sensing resistive current sensor and the Hall-type current sensor, indicates the overcurrent state.

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