Switching circuit, switching device and system

Abstract

The switching circuit comprises: a first circuit portion having a first switch and a second circuit portion having a second switch, the first circuit portion and the second circuit portion are connected in series, the first circuit portion has the following circuit structure: a combination of resistors connected to a signal path between output terminals of the first circuit portion differs depending on a conduction state of the first switch, and the second circuit portion has the following circuit structure: a combination of resistors connected to a signal path between output terminals of the second circuit portion differs depending on a conduction state of the second switch.

Description

Technical Field

[0001] The invention relates to a switch circuit, a switch device and a system. Background Art

[0002] For example, the following patent document 1 discloses a technology in which two resistors are connected in series in a circuit within a switching device, thereby detecting the resistance value of the switching device from an external device, thereby being able to detect faults such as disconnection and short circuit in a connection component connected to the external device.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-72894 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] However, in the prior art, it is impossible to detect malfunction of the switch provided inside the switch device (disconnection, short circuit due to poor recovery, etc.). In addition, for example, by redundantly providing two switches in the switch device, even if malfunction occurs at one switch, malfunction of one switch can be detected based on the operation of the other switch. However, in this method, it is necessary to connect a cable to each of the two switches from the outside, so the number of terminals and the number of cables of the switch device may increase, and the cost and weight may increase.

[0008] Solutions for solving technical problems

[0009] A switching circuit in one embodiment comprises: a first circuit portion having a first switch; and a second circuit portion having a second switch, the first circuit portion and the second circuit portion being connected in series, the first circuit portion having a circuit configuration in which a combination of resistors connected to a signal path between output terminals of the first circuit portion differs depending on a conduction state of the first switch, and the second circuit portion having a circuit configuration in which a combination of resistors connected to a signal path between output terminals of the second circuit portion differs depending on a conduction state of the second switch.

[0010] Effects of the Invention

[0011] According to one embodiment, it is possible to provide a switch device capable of detecting a fault including a malfunction of a switch without increasing the number of output terminals and the number of cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The figure is a perspective view of the appearance of a switch device according to one embodiment.

[0013] Figure 2 The figure is a perspective view of the appearance of a switch device according to one embodiment.

[0014] Figure 3 The present invention is an exploded perspective view of a switch device according to an embodiment.

[0015] Figure 4 This is a perspective view of the appearance of a terminal member included in a switch device according to one embodiment.

[0016] Figure 5 This is a perspective view of the appearance of a terminal member included in a switch device according to one embodiment.

[0017] Figure 6 A diagram showing a circuit configuration of a switch device according to one embodiment.

[0018] Figure 7 A diagram showing a configuration example of a system using a switch device according to an embodiment.

[0019] Figure 8 A diagram showing a first example of a fault location in a switchgear according to an embodiment.

[0020] Fig. 9 It is a diagram showing a second example of a fault location in the switchgear according to one embodiment.

[0021] Fig.10 It is a diagram showing a third example of a fault location in the switchgear according to one embodiment.

[0022] Fig.11 It is a diagram showing a fourth example of a fault location in the switchgear according to one embodiment.

[0023] Fig.12 A diagram showing a modified example of the switch device according to one embodiment.

[0024] Fig.13 A diagram showing a configuration example of a system using a switch device according to a modified example.

[0025] Fig.14 A diagram showing a first example of a fault location in a switchgear according to a modified example.

[0026] Fig.15 A diagram showing a second example of a fault location in a switchgear according to a modified example.

[0027] Fig.16 A diagram showing a third example of a fault location in a switchgear according to a modified example.

[0028] Fig.17A diagram showing a fourth example of a fault location in a switchgear according to a modified example. DETAILED DESCRIPTION

[0029] In the following description, for convenience, the Z-axis direction in the figure (the direction along the sliding movement direction of the operating member 123) is set as the vertical direction, and the X-axis direction and the Y-axis direction in the figure (the direction perpendicular to the sliding movement direction of the operating member 123) are set as the horizontal direction.

[0030] (Overview of Switch Device 100)

[0031] Figure 1 as well as Figure 2 FIG. 1 is a perspective view of the appearance of a switch device 100 according to an embodiment. Figure 1 as well as Figure 2 The switch device 100 shown is a switch device for a vehicle. The switch device 100 switches between an on state and an off state in accordance with the movement of a detection object provided in the vehicle. Thus, the switch device 100 can detect the state of the detection object. The switch device 100 is waterproof and can therefore be used even outside a vehicle. For example, the switch device 100 can be used as an opening and closing detection device for detecting the opening and closing state of a hood, a door, a trunk lid, etc. of a vehicle.

[0032] like Figure 1 as well as Figure 2 As shown, the switch device 100 includes a first switch unit 110A and a second switch unit 110B. The first switch unit 110A and the second switch unit 110B have the same configuration. Hereinafter, when the first switch unit 110A and the second switch unit 110B are not distinguished, they are simply referred to as "switch unit 110".

[0033] The switch unit 110 includes a housing 121 having a rectangular parallelepiped shape. A lever 122, an operating member 123, and a cover 125 are provided on the upper surface of the housing 121. In addition, two output terminals 124A and 124B are provided protrudingly on the bottom surface of the housing 121. In addition, the two output terminals 124A and 124B provided in the first switch unit 110A are referred to as output terminals 124A1 and 124B1, and the two output terminals 124A and 124B provided in the second switch unit 110B are referred to as output terminals 124A2 and 124B2.

[0034] like Figure 2 As shown, the switch device 100 is used in such a manner that the lever 122 of the first switch portion 110A and the lever 122 of the second switch portion 110B are simultaneously pressed downward as the detection target object (for example, the hood of a vehicle) moves.

[0035] When the rod 122 of each of the first switch unit 110A and the second switch unit 110B is pressed downward, the rod 122 deforms the cover body 125 and presses the operating member 123 downward, thereby each of the first switch unit 110A and the second switch unit 110B is switched to the on state, and the two output terminals 124A and 124B become conductive.

[0036] The switch device 100 has a circuit configuration in which the output terminal 124B1 of the first switch unit 110A and the output terminal 124A2 of the second switch unit 110B are connected by an arbitrary connection method, thereby having the first circuit unit 120A (see Figure 6 ) and the second circuit unit 120B (see Figure 6 ) are connected in series.

[0037] (Configuration of Switch Device 100)

[0038] Figure 3 FIG. 1 is an exploded perspective view of a switch device 100 according to an embodiment. Figure 3 As shown, each of the first switch unit 110A and the second switch unit 110B includes, from the top in the figure, a rod 122 , a housing 121 , a cover 125 , an operating member 123 , a movable contact 126 , a spring 127 , a terminal member 124 , and a wafer 128 .

[0039] The rod 122 is an elastic thin plate-shaped member extending above the housing 121 along the length direction of the housing 121 (the X-axis direction in the figure). For example, the rod 122 is formed by processing an elastic metal plate such as a stainless steel plate. One end of the rod 122 (the end on the negative side of the X-axis in the figure) is inserted into a support hole 121A formed on the upper surface of the housing 121, thereby being fixed to the housing 121. The other end of the rod 122 (the end on the positive side of the X-axis in the figure) is located above the operating member 123. The rod 122 is pressed downward through the other end, so that the operating member 123 can be pressed downward.

[0040] The housing 121 is a container-like component having a roughly rectangular parallelepiped shape. The housing 121 has a lower opening 121C at the bottom portion, and each component (cover 125, operating component 123, movable contact 126, spring 127, terminal component 124, and wafer 128) can be loaded into the interior through the lower opening 121C. For example, the housing 121 is formed using a relatively hard insulating raw material (for example, synthetic resin, etc.). On the upper surface of the housing 121, there are provided a support hole 121A for inserting and supporting one end of the rod 122 and a through hole 121B for the operating component 123 and the housing 125 to pass through.

[0041] The cover 125 penetrates through the through hole 121B formed on the upper surface of the housing 121 together with the operating portion 123B while covering the operating portion 123B of the operating member 123, thereby filling the gap between the operating portion 123B and the through hole 121B, thereby preventing water from seeping into the housing 121 from the gap. For example, the cover 125 is formed using an elastic material such as rubber or silicon.

[0042] The operating member 123 is a member that is pressed by the rod 122 and slides downward, thereby switching the switch portion 110 to the on state. The operating member 123 includes a sliding portion 123A that slides in the up-down direction inside the housing 121 and a columnar operating portion 123B that stands upright from the upper surface of the sliding portion 123A. The operating portion 123B passes through a through hole 121B formed on the upper surface of the housing 121 and protrudes from the upper surface of the housing 121. Thus, the operating portion 123B can be pressed downward, and the sliding portion 123A can be slid downward by the pressing operation. For example, the operating member 123 is formed using a relatively hard insulating raw material (for example, a synthetic resin, etc.).

[0043] The movable contact 126 is provided inside the housing 121 and on the lower side of the operating member 123 in a manner that allows it to slide in the up-down direction. The movable contact 126 has a horizontal flat plate-shaped connecting portion 126C and a clamping portion 126A and a clamping portion 126B provided at both ends of the connecting portion 126C (the two ends in the X-axis direction in the figure). The clamping portion 126A clamps the first contact 124C of the terminal member 124 and slides along the first contact 124C in the up-down direction. The clamping portion 126B clamps the second contact 124D of the terminal member 124 and slides along the second contact 124D in the up-down direction. For example, the movable contact 126 is formed using a metal plate having conductivity and elasticity. When the operating member 123 is not pressed downward, the movable contact 126 contacts the second contact 124D and does not contact the first contact 124C, thereby setting the first contact 124C and the second contact 124D to a non-conductive state. On the other hand, when the operating member 123 is pressed downward, the movable contact 126 moves downward together with the operating member 123 and contacts each of the first contact 124C and the second contact 124D, thereby setting the first contact 124C and the second contact 124D to a conductive state.

[0044] The spring 127 is a so-called coil spring provided between the connection portion 126C of the movable contact 126 and the wafer 128 in a manner capable of elastic deformation in the up-down direction. When the operating member 123 is pressed downward, the spring 127 is compressed by the movable contact 126 that slides downward together with the operating member 123. When the pressing downward of the operating member 123 is released, the spring 127 lifts the movable contact 126 and the operating member 123 upward by elastic restoring force, so that the movable contact 126 and the operating member 123 return to their original positions.

[0045] The terminal member 124 is a member constituting the circuit pattern of the switch section 110. For example, the terminal member 124 is formed by processing a conductive metal plate (for example, stamping, bending, etc.). The terminal member 124 has a first contact 124C, a second contact 124D, and output terminals 124A and 124B. In addition, resistors R1 and R2 are provided in the terminal member 124 of the first switch section 110A. In addition, resistors R3 and R4 are provided in the terminal member 124 of the second switch section 110B. For details of the terminal member 124, the following will be used. Figure 4 as well as Figure 5 In addition, in the present embodiment, the resistors R1, R2, R3, and R4 have different resistance values. Thus, the resistance value of the switch device 100 can be made different according to the fault location of the switch device 100, thereby making it easy to identify the fault.

[0046] The wafer 128 is a flat plate-shaped member mounted on the bottom surface portion of the housing 121 to close the lower opening 121C of the housing 121. A support wall 128A is provided on the upper surface of the wafer 128 to support the terminal member 124 in an upright state.

[0047] In addition, in the switch device 100 of the present embodiment, the first switch unit 110A and the second switch unit 110B each have a housing 121, but the present invention is not limited thereto, and the switch device 100 may be formed by assembling the components of the first switch unit 110A and the components of the second switch unit 110B into one housing. In this case, the output terminal 124B1 of the first switch unit 110A and the output terminal 124A2 of the second switch unit 110B may be integrated in the housing.

[0048] (Configuration of Terminal Member 124)

[0049] Figure 4 as well as Figure 5 1 is a perspective view of the appearance of a terminal member 124 provided in a switch device 100 according to an embodiment. Figure 4 as well as Figure 5 , a movable contact 126 and a spring 127 are shown together with the terminal member 124 . Figure 4 represents the disconnected state of the switch device 100, Figure 5 Indicates the on state of the switch device 100.

[0050] like Figure 4 as well as Figure 5 As shown, the terminal member 124 includes a first component part 401, a second component part 402, a third component part 403 and a fourth component part 404 formed separately from each other by processing a conductive metal plate on the same plane (XZ plane in the figure).

[0051] The first component 401 has an output terminal 124A at the lower end. The output terminal 124A is a portion that protrudes downward from the bottom surface of the wafer 128 and is connected to the outside. In addition, the first component 401 has a connection portion 401A connected to the third component 403 at the upper end.

[0052] The second component 402 is arranged in parallel with the first component 401 in the longitudinal direction of the switch device 100 (the X-axis direction in the figure). The second component 402 has an output terminal 124B at the lower end. The output terminal 124B is a portion that protrudes downward from the bottom surface of the wafer 128 and is connected to the outside. In addition, the second component 402 has an extension portion 402A, which extends from the lower side of the spring 127 along the longitudinal direction of the switch device 100 (the X-axis direction in the figure) to a position parallel to the connection portion 401A of the first component 401. A connection portion 402B connected to the third component 403 is provided at the front end of the extension portion 402A (that is, a position parallel to the connection portion 401A). In addition, the second component 402 has a second contact 124D that extends linearly in the vertical direction on the side of the spring 127 (the side of the positive side of the X-axis in the figure). The second contact 124D is a portion that is clamped by the clamping portion 126B of the movable contact 126 and that allows the clamping portion 126B to slide in the up-down direction.

[0053] The third component 403 is separated upward from the connection portion 401A of the first component 401 and the connection portion 402B of the second component 402, and extends in a substantially linear shape along the length direction (X-axis direction in the figure) of the switch device 100. The third component 403 is connected to the connection portion 401A through a resistor R1 (or a resistor R3). In addition, the third component 403 is connected to the connection portion 402B through a resistor R2 (or a resistor R4). A first contact 124C extending in a linear shape in the up-down direction is provided at the end of the third component 403 (the end on the positive side of the X-axis in the figure). When the switch device 100 is in the on state, the first contact 124C is a portion clamped by the clamping portion 126A of the movable contact 126 and for the clamping portion 126A to slide and move in the up-down direction.

[0054] The fourth component 404 is provided upwardly separately from the third component 403, and extends substantially linearly along the longitudinal direction (the X-axis direction in the figure) of the switch device 100. A support portion 404A is provided at the end (the end on the positive side of the X-axis in the figure) of the fourth component 404. The support portion 404A is provided upwardly separately from the first contact 124C included in the third component 403, and is clamped by the clamping portion 126A included in the movable contact 126 when the switch device 100 is in the off state, thereby supporting the clamping portion 126A.

[0055] like Figure 4As shown, when the operating member 123 is not pressed downward, the clamping portion 126A of the movable contact 126 contacts the second contact 124D but does not contact the first contact 124C. As a result, the first contact 124C and the second contact 124D are not in a conductive state with each other, and the switch device 100 is in an OFF state.

[0056] On the other hand, Figure 5 As shown, when the operating member 123 is pushed downward, the clamping portion 126A of the movable contact 126 comes into contact with each of the first contact 124C and the second contact 124D. As a result, the first contact 124C and the second contact 124D are in conduction with each other, and the switch device 100 is turned on.

[0057] (Circuit Configuration of Switching Device 100)

[0058] Figure 6 FIG. 1 is a diagram showing a circuit configuration of a switch device 100 according to an embodiment. Figure 6 As shown, the switch device 100 has a circuit configuration in which a first circuit portion 120A included in a first switch portion 110A and a second circuit portion 120B included in a second switch portion 110B are connected in series.

[0059] The first circuit unit 120A includes an output terminal 124A1, an output terminal 124B1, a switch SW1, a resistor R1, and a resistor R2. The switch SW1 includes a first contact 124C and a second contact 124D included in the terminal member 124, and a movable contact 126.

[0060] Output terminal 124A1 is connected to first contact 124C of switch SW1 via resistor R1. Output terminal 124A1 is externally connected as an output terminal of switch device 100. Output terminal 124B1 is connected to second contact 124D of switch SW1. Output terminal 124B1 is connected to output terminal 124A2 of second circuit unit 120B.

[0061] One end of the resistor R1 is connected to the output terminal 124A1, and the other end is connected to the first contact 124C of the switch SW1 and the resistor R2. That is, the resistor R1 is connected in series with the switch SW1 and the resistor R2.

[0062] One end of the resistor R2 is connected between the resistor R1 and the first contact 124C of the switch SW1, and the other end is connected between the second contact 124D of the switch SW1 and the output terminal 124B1. That is, the resistor R2 is connected in parallel with the switch SW1.

[0063] Thus, the first circuit unit 120A has a circuit configuration in which the combination of resistors connected to the signal path between the output terminals 124A1 and 124B1 varies depending on the on-state of the switch SW1. Thus, when the switch SW1 is on, the resistance value between the output terminals 124A1 and 124B1 is "R1". When the switch SW1 is off, the resistance value between the output terminals 124A1 and 124B1 is "R1+R2".

[0064] The second circuit unit 120B includes an output terminal 124A2, an output terminal 124B2, a switch SW2, a resistor R3, and a resistor R4. The switch SW2 includes a first contact 124C and a second contact 124D included in the terminal member 124, and a movable contact 126.

[0065] Output terminal 124A2 is connected to first contact 124C of switch SW2 via resistor R3. Output terminal 124A2 is connected to output terminal 124B1 of first circuit unit 120A. Output terminal 124B2 is connected to second contact 124D of switch SW2. Output terminal 124B2 is connected to the outside as an output terminal of switch device 100.

[0066] One end of the resistor R3 is connected to the output terminal 124A2, and the other end is connected to the first contact 124C of the switch SW2 and the resistor R4. That is, the resistor R3 is connected in series with the switch SW2 and the resistor R4.

[0067] One end of the resistor R4 is connected between the resistor R3 and the first contact 124C of the switch SW2, and the other end is connected between the second contact 124D of the switch SW2 and the output terminal 124B2. That is, the resistor R4 is connected in parallel with the switch SW2.

[0068] Thus, the second circuit unit 120B has a circuit configuration in which the combination of resistors connected to the signal path between the output terminals 124A2 and 124B2 is different depending on the on state of the switch SW2. Thus, when the switch SW2 is on, the resistance value between the output terminals 124A2 and 124B2 is "R3". When the switch SW2 is off, the resistance value between the output terminals 124A2 and 124B2 is "R3+R4".

[0069] have Figure 6In the switch device 100 of the circuit configuration shown, when the operating member 123 is pressed downward, the switches SW1 and SW2 are simultaneously switched to the on state. As a result, the resistance value between the output terminal 124A1 and the output terminal 124B2 becomes "R1+R3", and the switch device 100 is in the on state. In addition, when the operating member 123 is restored to the original position, the switches SW1 and SW2 of the switch device 100 are simultaneously switched to the off state. As a result, the resistance value between the output terminal 124A1 and the output terminal 124B2 becomes "R1+R2+R3+R4", and the switch device 100 is in the off state.

[0070] (Configuration Example of a System Using the Switch Device 100)

[0071] Figure 7 FIG. 2 is a diagram showing a configuration example of a system 20 using a switch device 100 according to an embodiment. Figure 7 As shown, the system 20 includes a switch device 100 and a control device 22. The switch device 100 and the control device 22 are connected to each other via cables 24A, 24B, a connector 26, and circuits 28A, 28B.

[0072] (Fault Detection Method Implemented by System 20)

[0073] Reference Figure 8 to Figure 11 , the fault detection method implemented by the system 20 is described. Figure 7 The system 20 shown can detect malfunction of switches SW1 and SW2 in the switching device 100 and faults in the signal path between the control device 22 and the switching device 100 by detecting the resistance value between the two output terminals 124A1 and 124B2 of the switching device 100 through the control device 22 .

[0074] For example, when no fault occurs in the system 20, the resistance value of the switch device 100 detected by the control device 22 (the resistance value between the two output terminals 124A1 and 124B2) is "R1+R2+R3+R4" when the switch device 100 is in the off state, and is "R1+R3" when the switch device 100 is in the on state. Thus, the control device 22 can detect the state of the detection object (for example, the open or closed state of the hood of the vehicle) and perform control corresponding to the detected state of the detection object (for example, lighting of a warning light, limitation of a certain function, etc.).

[0075] Figure 8 FIG. 1 is a diagram showing a first example of a fault location in a switch device 100 according to an embodiment. Figure 8As shown, when a disconnection E1 occurs in the signal path (e.g., cables 24A, 24B, connector 26, cables 28A, 28B, etc.) between the control device 22 and the switch device 100, the resistance value between the output terminal 124A1 and the output terminal 124B2 detected by the control device 22 becomes "∞ (open)". The control device 22 can detect the disconnection E1 in the signal path between the control device 22 and the switch device 100 through this resistance value.

[0076] Fig. 9 FIG. 2 is a diagram showing a second example of a fault location in the switch device 100 according to one embodiment. Fig. 9 As shown in FIG. 1 , when a short circuit E2 occurs in the signal path (e.g., cables 24A, 24B, connector 26, cables 28A, 28B, etc.) between the control device 22 and the switch device 100, the resistance value of the switch device 100 detected by the control device 22 becomes "0". The control device 22 can detect that a short circuit E2 occurs in the signal path between the control device 22 and the switch device 100 through this resistance value.

[0077] Fig.10 1 is a diagram showing a third example of a fault location in the switch device 100 according to one embodiment. Fig.10 Indicates the state of the circuit when the operating member 123 has been pressed downward. Fig.10 As shown in the example, when one of the switches SW1 and SW2 cannot be switched to the on state (for example, bending of the movable contact 126, poor contact, etc.), the resistance value of the switch device 100 detected by the control device 22 becomes the sum of the resistance values ​​of the two resistors connected to the switch that cannot be switched to the on state and the resistance value of the resistor connected in series with the switch that is switched to the on state.

[0078] For example, Fig.10 As shown, when a failure E3 occurs in the switch SW1 that cannot be switched to the on state, the resistance value of the switch device 100 detected by the control device 22 becomes "R1+R2+R3". The control device 22 can detect that the switch SW1 cannot be switched to the on state based on this resistance value.

[0079] On the other hand, when a failure occurs in switch SW2 that makes it impossible to switch to the on state, the resistance value of switch device 100 detected by control device 22 becomes "R1+R3+R4". Based on this resistance value, control device 22 can detect that switch SW2 cannot switch to the on state.

[0080] Fig.11 FIG. 4 is a diagram showing a fourth example of a fault location in the switch device 100 according to the embodiment. Fig.11Indicates the state of the circuit when the operating member 123 is not pressed downward. Fig.11 As shown in the example, when one of the switches SW1 and SW2 cannot be restored to the disconnected state (for example, the movable contact 126 is fixed, etc.), the resistance value of the switch device 100 detected by the control device 22 becomes the sum of the resistance values ​​of the two resistors connected to the switch that has been restored to the disconnected state and the resistance value of the resistor connected in series with the switch that cannot be restored to the disconnected state.

[0081] For example, Fig.11 As shown, when a failure E4 occurs in the switch SW1 that cannot be restored to the open state, the resistance value of the switch device 100 detected by the control device 22 becomes "R1+R3+R4". Based on this resistance value, the control device 22 can detect that the switch SW1 cannot be restored to the open state.

[0082] On the other hand, when a failure occurs in switch SW2 that makes it impossible to return to the open state, the resistance value of switch device 100 detected by control device 22 becomes "R1+R2+R3". Based on this resistance value, control device 22 can detect that switch SW2 cannot return to the open state.

[0083] As described above, a switch device 100 according to one embodiment is a switch circuit configured as follows: it includes a first circuit portion 120A having a switch SW1 (first switch) and a second circuit portion 120B having a switch SW2 (second switch), the first circuit portion 120A and the second circuit portion 120B being connected in series, and the on-state of the switch SW1 and the on-state of the switch SW2 are switched simultaneously according to the operation of the operating component 123, the first circuit portion 120A has the following circuit configuration: a combination of resistors connected to a signal path between output terminals 124A1 and 124B1 of the first circuit portion 120A differs depending on the on-state of the switch SW1, and the second circuit portion 120B has the following circuit configuration: a combination of resistors connected to a signal path between output terminals 124A2 and 124B2 of the second circuit portion 120B differs depending on the on-state of the switch SW2.

[0084] In particular, in a switching device 100 of one embodiment, the first circuit portion 120A has a resistor R1 connected in series with the switch SW1, and a resistor R2 connected in series with the resistor R1 and in parallel with the switch SW1, and the second circuit portion 120B has a resistor R3 connected in series with the switch SW2, and a resistor R4 connected in series with the resistor R3 and in parallel with the switch SW2.

[0085] Therefore, when the switch device 100 of one embodiment is in the on state, the resistance value (the resistance value between the output terminals 124A1 and 124B2) becomes "R1+R3", and when the switch device 100 is in the off state, the resistance value becomes "R1+R2+R3+R4".

[0086] In addition, the switch device 100 of one embodiment has a resistance value of "∞ (open)" when a disconnection occurs in the signal path connected to the switch device 100, and has a resistance value of "0" when a short circuit occurs in the signal path connected to the switch device 100.

[0087] In addition, in the switch device 100 according to one embodiment, when a failure occurs in the switch SW1 that prevents it from switching to the on state, the resistance value becomes "R1+R2+R3", and when a failure occurs in the switch SW2 that prevents it from switching to the on state, the resistance value becomes "R1+R3+R4".

[0088] In addition, in the switch device 100 according to one embodiment, when a failure occurs in the switch SW1 that cannot be restored to the open state, the resistance value becomes "R1+R3+R4", and when a failure occurs in the switch SW2 that cannot be restored to the open state, the resistance value becomes "R1+R2+R3".

[0089] That is, the switch device 100 of one embodiment can determine each of the on state, the off state, the disconnection of the signal path, the short circuit of the signal path, and the malfunction of each switch by the resistance value between the two output terminals 124A1 and 124B2.

[0090] Therefore, according to the switch device 100 of one embodiment, it is possible to provide a switch device capable of performing fault identification including switch malfunction without increasing the number of output terminals and the number of cables.

[0091] (Modification of Switch Device 100)

[0092] Fig.12 It is a diagram showing a modified example of the switch device 100 according to one embodiment. Fig.12 The circuit configuration shown in the figure shows the circuit configuration of a switch device 100A as a modified example of the switch device 100. In the switch device 100A, a first switch unit 110C and a second switch unit 110D are provided instead of the first switch unit 110A and the second switch unit 110B. The circuit configuration of the first switch unit 110C is the same as that of the first switch unit 110A, and the other aspects are the same as those of the first switch unit 110A. The circuit configuration of the second switch unit 110D is different from that of the second switch unit 110B, and the other aspects are the same as those of the second switch unit 110B.

[0093] like Fig.12 As shown, in the first circuit section 120C, one end of the resistor R1 is connected to the output terminal 124A1, and the other end is connected to the first contact 124C of the switch SW1. That is, the resistor R1 and the switch SW1 are connected in series.

[0094] One end of the resistor R2 is connected between the output terminal 124A1 and the resistor R1, and the other end is connected between the second contact 124D of the switch SW1 and the output terminal 124B1. That is, the resistor R2 is connected in parallel with the switch SW1 and the resistor R1 connected in series.

[0095] Thus, the first circuit unit 120C has a circuit configuration in which the combination of resistors connected to the signal path between the output terminals 124A1 and 124B1 varies depending on the on-state of the switch SW1. Thus, when the switch SW1 is on, the resistance value between the output terminals 124A1 and 124B1 becomes "R1×R2 / (R1+R2)". When the switch SW1 is off, the resistance value between the output terminals 124A1 and 124B1 becomes "R2".

[0096] In the second circuit section 120D, one end of the resistor R3 is connected to the output terminal 124A2, and the other end is connected to the first contact 124C of the switch SW2. That is, the resistor R3 and the switch SW2 are connected in series.

[0097] In addition, one end of the resistor R4 is connected between the output terminal 124A2 and the resistor R3, and the other end is connected between the second contact 124D of the switch SW2 and the output terminal 124B2. That is, the resistor R4 is connected in parallel with the switch SW2 and the resistor R3 connected in series.

[0098] Thus, the second circuit unit 120B has a circuit configuration in which the combination of resistors connected to the signal path between the output terminals 124A2 and 124B2 is different depending on the on-state of the switch SW2. Thus, when the switch SW2 is in the on-state, the resistance value between the output terminals 124A2 and 124B2 becomes "R3×R4 / (R3+R4)". When the switch SW2 is in the off-state, the resistance value between the output terminals 124A2 and 124B2 becomes "R4".

[0099] have Fig.12In the switch device 100A of the circuit configuration shown, when the operating member 123 is pressed downward, the switches SW1 and SW2 are simultaneously switched to the on state. As a result, the resistance value between the output terminal 124A1 and the output terminal 124B2 becomes "R1×R2 / (R1+R2)+R3×R4 / (R3+R4)", and the switch device 100 is in the on state. In addition, in the switch device 100A, when the operating member 123 is returned to the original position, the switches SW1 and SW2 are simultaneously switched to the off state. As a result, the resistance value between the output terminal 124A1 and the output terminal 124B2 becomes "R2+R4", and the switch device 100 is in the off state.

[0100] (Configuration Example of a System Using Switchgear 100A)

[0101] Fig.13 FIG. 2 is a diagram showing a configuration example of a system 20A using a switch device 100A according to a modified example. Fig.13 As shown, the system 20A includes a switch device 100A and a control device 22. The switch device 100A and the control device 22 are connected to each other via cables 24A, 24B, a connector 26, and cables 28A, 28B.

[0102] (Fault Detection Method Implemented by System 20A)

[0103] Reference Figure 14 to Figure 17 , the fault detection method implemented by system 20A is described. Fig.13 The system 20A shown can detect malfunction of switches SW1 and SW2 in the switch device 100A and faults in the signal path between the control device 22 and the switch device 100A by detecting the resistance value between the two output terminals 124A1 and 124B2 of the switch device 100A through the control device 22.

[0104] For example, when no fault occurs in the system 20A, the resistance value of the switch device 100A detected by the control device 22 (the resistance value between the two output terminals 124A1 and 124B2) is "R2+R4" when the switch device 100A is in the off state, and is "R1×R2 / (R1+R2)+R3×R4 / (R3+R4)" when the switch device 100A is in the on state. Thus, the control device 22 can detect the state of the detection object (for example, the open or closed state of the hood of the vehicle) and perform control corresponding to the detected state of the detection object.

[0105] Fig.14 FIG. 1 is a diagram showing a first example of a fault location in a switch device 100A according to a modified example. Fig.14As shown in FIG. 1 , when a disconnection E5 occurs in the signal path (e.g., cables 24A, 24B, connector 26, cables 28A, 28B, etc.) between the control device 22 and the switch device 100A, the resistance value of the switch device 100A detected by the control device 22 becomes "∞ (open circuit)". The control device 22 can detect the disconnection E5 in the signal path between the control device 22 and the switch device 100A through this resistance value.

[0106] Fig.15 FIG. 2 is a diagram showing a second example of a fault location in a switch device 100A according to a modified example. Fig.15 As shown in FIG. 1 , when a short circuit E6 occurs in the signal path (e.g., cables 24A, 24B, connector 26, cables 28A, 28B, etc.) between the control device 22 and the switch device 100A, the resistance value of the switch device 100A detected by the control device 22 becomes "0". The control device 22 can detect the occurrence of the short circuit E6 in the signal path between the control device 22 and the switch device 100A through this resistance value.

[0107] Fig.16 1 is a diagram showing a third example of a fault location in the switch device 100A according to a modification. Fig.16 Indicates the state of the circuit when the operating member 123 has been pressed downward. Fig.16 As shown in the example, when one of the switches SW1 and SW2 cannot be switched to the on state, the resistance value of the switch device 100A detected by the control device 22 becomes the sum of the resistance value of the circuit on the switch side that cannot be switched to the on state when in the off state and the resistance value of the circuit on the switch side that has been switched to the on state when in the on state.

[0108] For example, Fig.16 As shown, when a failure E7 occurs in the switch SW1 that makes it unable to switch to the on state, the resistance value of the switch device 100A detected by the control device 22 becomes "R2+R3×R4 / (R3+R4)". Based on this resistance value, the control device 22 can detect that the switch SW1 cannot switch to the on state.

[0109] On the other hand, when a failure occurs in switch SW2 that makes it impossible to switch to the on state, the resistance value of switch device 100A detected by control device 22 becomes "R1×R2 / (R1+R2)+R4". Based on this resistance value, control device 22 can detect that switch SW2 cannot switch to the on state.

[0110] Fig.17 FIG. 4 is a diagram showing a fourth example of a fault location in the switch device 100A according to a modification. Fig.17Indicates the state of the circuit when the operating member 123 is not pressed downward. Fig.17 As shown in the example, when one of the switches SW1 and SW2 cannot be restored to the disconnected state, the resistance value of the switching device 100A detected by the control device 22 becomes the sum of the resistance value of the circuit on the switch side that has been restored to the disconnected state when in the disconnected state and the resistance value of the circuit on the switch side that cannot be restored to the disconnected state when in the connected state.

[0111] For example, Fig.17 As shown, when a failure E8 occurs in the switch SW1 that cannot be restored to the open state, the resistance value of the switch device 100A detected by the control device 22 becomes "R1×R2 / (R1+R2)+R4". Based on this resistance value, the control device 22 can detect that the switch SW1 cannot be restored to the open state.

[0112] On the other hand, when a failure occurs in the switch SW2 that makes it impossible to return to the open state, the resistance value of the switch device 100A detected by the control device 22 becomes "R2+R3×R4 / (R3+R4)". Based on this resistance value, the control device 22 can detect that the switch SW2 cannot return to the open state.

[0113] As described above, a switch device 100A of a modified example is a switch circuit constructed in the following manner: it has a first circuit portion 120C having a switch SW1 (first switch) and a second circuit portion 120D having a switch SW2 (second switch), the first circuit portion 120C and the second circuit portion 120D are connected in series, and the on-state of the switch SW1 and the on-state of the switch SW2 are switched simultaneously according to the operation of the operating component 123, the first circuit portion 120C has the following circuit structure: the combination of resistors connected to the signal path between the output terminals 124A1 and 124B1 of the first circuit portion 120C is different according to the on-state of the switch SW1, and the second circuit portion 120D has the following circuit structure: the combination of resistors connected to the signal path between the output terminals 124A2 and 124B2 of the second circuit portion 120D is different according to the on-state of the switch SW2.

[0114] In particular, in a switching device 100A of a modified example, the first circuit portion 120C has a resistor R1 connected in series with the switch SW1, and a resistor R2 connected in parallel with the switch SW1 connected in series and the resistor R1, and the second circuit portion 120D has a resistor R3 connected in series with the switch SW2, and a resistor R4 connected in parallel with the switch SW2 and the resistor R3 connected in series.

[0115] Therefore, in a modified example of a switch device 100A, when the switch device 100A is in the on state, the resistance value (the resistance value between the output terminals 124A1 and 124B2) becomes "R1×R2 / (R1+R2)+R3×R4 / (R3+R4)", and when the switch device 100A is in the off state, the resistance value becomes "R2+R4".

[0116] In addition, in a switch device 100A of a modified example, when a disconnection occurs in a signal path connected to the switch device 100A, the resistance value becomes "∞ (open circuit)", and when a short circuit occurs in the signal path connected to the switch device 100A, the resistance value becomes "0".

[0117] In addition, in a modified example of a switch device 100A, when a failure occurs in the switch SW1 that prevents it from switching to the on state, the resistance value becomes "R2+R3×R4 / (R3+R4)", and when a failure occurs in the switch SW2 that prevents it from switching to the on state, the resistance value becomes "R1×R2 / (R1+R2)+R4".

[0118] In addition, in a modified example of a switch device 100A, when a failure occurs in the switch SW1 that cannot be restored to the open state, the resistance value becomes "R1×R2 / (R1+R2)+R4", and when a failure occurs in the switch SW2 that cannot be restored to the open state, the resistance value becomes "R2+R3×R4 / (R3+R4)".

[0119] That is, the switch device 100A of a modified example can determine each of the on state, the off state, the disconnection of the signal path, the short circuit of the signal path, and the malfunction of each switch by the resistance value between the two output terminals 124A1 and 124B2.

[0120] Therefore, according to the switch device 100A of a modified example, it is possible to provide a switch device capable of performing fault determination including switch malfunction without increasing the number of output terminals and the number of cables.

[0121] As mentioned above, although one embodiment of the present invention has been described in detail, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims.

[0122] For example, the switch device of the present invention is not limited to the configuration described in the above embodiment, and may have any configuration as long as it has a switch circuit in which at least a first circuit unit and a second circuit unit are connected in series.

[0123] In addition, for example, the first circuit unit and the second circuit unit of the present invention are not limited to the circuit configuration described in the above embodiment, and may have any circuit configuration as long as the combination of resistors connected to the signal path is different depending on the conduction state of the switch.

[0124] In addition, in the above-mentioned embodiment, the switch device 100, 100A is configured to switch the switch SW1 and the switch SW2 to the on state at the same time through the operating component 123, but the result is that both the switch SW1 and the switch SW2 are switched to the on state. It is sufficient, therefore, that the timing of switching the switch SW1 to the on state is slightly different from the timing of switching the switch SW2 to the on state.

[0125] This international application claims priority based on Japanese Patent Application No. 2018-136840, filed on July 20, 2018, the entire contents of which are incorporated herein by reference.

[0126] Description of Reference Numerals

[0127] 20, 20A system

[0128] 22 Control Devices

[0129] 100, 100A switchgear

[0130] 110A, 110C First switch unit

[0131] 110B, 110D Second switch unit

[0132] 120A, 120C First circuit unit

[0133] 120B, 120D Second circuit unit

[0134] 121 Housing

[0135] 122 bars

[0136] 123 Operating parts

[0137] 124 Terminal parts

[0138] 125 Cover

[0139] 126 Movable contact

[0140] 127 Spring

[0141] 128 Wafer

[0142] SW1 switch (first switch)

[0143] SW2 switch (second switch)

[0144] R1 resistor (first resistor)

[0145] R2 resistor (second resistor)

[0146] R3 resistor (third resistor)

[0147] R4 resistor (fourth resistor)

Claims

1. A switching circuit, comprising: A first circuit unit having a first switch and a first output terminal; and The second circuit unit has a second switch and a second output terminal, The first circuit unit is connected in series with the second circuit unit. The switching circuit is characterized in that: The first circuit unit has a circuit configuration in which a combination of resistors connected to a signal path between the first output terminals of the first circuit unit varies depending on a conduction state of the first switch. The second circuit unit has a circuit configuration in which a combination of resistors connected to a signal path between the second output terminals of the second circuit unit varies depending on a conduction state of the second switch. The first switch and the second switch are arranged in parallel. The switch circuit further includes an operating component of each of the first switch and the second switch. When the first switch and the second switch are arranged in parallel, the operating components of the first switch and the second switch are arranged on the same side. According to the operation of the operating members of the first switch and the second switch, the conducting state of the first switch and the conducting state of the second switch are switched simultaneously.

2. The switch circuit according to claim 1, characterized in that: The first circuit unit comprises: A first resistor is connected in series with the first switch; and a second resistor connected in series with the first resistor and connected in parallel with the first switch, The second circuit unit has: A third resistor is connected in series with the second switch; and The fourth resistor is connected in series with the third resistor and in parallel with the second switch.

3. The switch circuit according to claim 1, characterized in that: The first circuit unit has: A first resistor is connected in series with the first switch; and A second resistor is connected in parallel with the first switch and the first resistor connected in series. The second circuit unit has: A third resistor is connected in series with the second switch; and The fourth resistor is connected in parallel with the second switch and the third resistor connected in series.

4. The switch circuit according to claim 2 or 3, characterized in that: The first resistor, the second resistor, the third resistor, and the fourth resistor have resistance values ​​different from each other.

5. A switch device, characterized in that: A switch circuit according to any one of claims 1 to 4 is provided.

6. A system, characterized in that: have: The switch device as claimed in claim 5; and The control device determines each of the on state of the switching device, the off state of the switching device, malfunction of the first switch or the second switch, and a fault in a signal path connected to the switching device based on the resistance value detected from the switching device.

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