Broken line detection circuit and detection device

Abstract

The utility model discloses a broken line detection circuit and a detection device, the broken line detection circuit is used for detecting a flat cable, the flat cable comprises a plurality of sub flat cables, one end of each sub flat cable receives a first voltage, and the broken line detection circuit comprises a first switch, a first resistor, a plurality of detection circuits, a second switch and an alarm circuit. The plurality of sub flat cables are correspondingly connected with the plurality of detection circuits, and the plurality of detection circuits are connected with the alarm circuit. When the sub flat cable is broken, the alarm circuit generates an alarm signal and locks the alarm signal, and the detection circuit corresponding to the sub flat cable generates a first optical signal. Through cooperative work of the alarm circuit and the plurality of detection circuits, when at least one sub-flat cable of the flat cable is broken, an alarm signal and a first optical signal can be received in time, and the broken state of the flat cable can be fed back more intuitively and timely according to the alarm signal and the first optical signal, so that the broken flat cable can be quickly responded, and the working efficiency of the flat cable is improved. Corresponding measures are taken in time; and when the flat cable is broken virtually, the probability of misjudgment is reduced.

Description

Technical Field

[0001] The present application relates to the field of electronic technologies, and particularly to a wire break detection circuit and a detection device. Background Art

[0002] In electronic devices, as a key component connecting various electronic components, the durability of a flexible printed circuit (FPC) is crucial for ensuring the long-term stable operation of the device. During the design and manufacturing process of the FPC, in order to evaluate its reliability under repeated motion conditions, a fatigue test is usually carried out.

[0003] In the prior art, the fatigue test of the FPC usually uses a simple detection circuit to monitor the working state of the FPC. The circuit includes a power supply, a current-limiting resistor, a light-emitting diode, and the FPC itself. When the FPC works normally, closing the switch, the power supply forms a closed loop through the current-limiting resistor, the light-emitting diode, and the FPC, causing the light-emitting diode to light up, thereby indicating that the FPC is in a normal state. On the contrary, if the FPC breaks during the test, the circuit is interrupted and the light-emitting diode goes out, from which it can be judged that the FPC is broken.

[0004] The prior art solution uses the on-off change of the light-emitting diode to feedback the state of the FPC, but in some cases, such as when the FPC breaks under poor ambient light or complex ambient light conditions, it is not intuitive and timely enough to feedback the wire break state of the FPC, resulting in difficulty in quickly reacting to the wire break of the FPC and being unable to take corresponding measures in time; when the FPC has a virtual break, the probability of misjudgment increases. Utility Model Content

[0005] The main technical problem to be solved by the present application is to provide a wire break detection circuit and a detection device to solve the problem that the state of the FPC cannot be timely feedback when the FPC breaks.

[0006] The present application provides a wire break detection circuit for detecting an FPC. The FPC includes a plurality of sub-FPCs. One end of each sub-FPC receives a first voltage. The wire break detection circuit includes:

[0007] A first switch and a first resistor, the first end of the first switch receives a second voltage through the first resistor;

[0008] A plurality of detection circuits, corresponding to the plurality of sub-FPCs one by one. The first end of the detection circuit is connected to the second end of the first switch, and the second end of the detection circuit is connected to the corresponding sub-FPC;

[0009] A second switch and an alarm circuit, the first end of the second switch receives a third voltage, the second end of the second switch is connected to the alarm circuit, and the third ends of all the detection circuits are connected to the alarm circuit;

[0010] When at least one of the sub-ribbon cables in the ribbon cable is broken, control the second switch to conduct and the first switch to disconnect. The alarm circuit generates an alarm signal and locks the alarm signal, and the corresponding detection circuit generates a first optical signal to locate the broken sub-ribbon cable according to the first optical signal.

[0011] In some embodiments, the detection circuit includes:

[0012] A unidirectional thyristor, the first end of the unidirectional thyristor is connected to the second end of the first switch, and the second end of the unidirectional thyristor is grounded through a second resistor and a third resistor;

[0013] A first light-emitting diode, the anode of the first light-emitting diode is connected to the other end of the sub-ribbon cable, and the cathode of the first light-emitting diode is connected to the third end of the unidirectional thyristor;

[0014] A first switching tube, the first end of the first switching tube is connected to one end of the third resistor;

[0015] A second light-emitting diode, the second end of the first switching tube is connected to the other end of the third resistor through the second light-emitting diode;

[0016] A fourth resistor, the third end of the first switching tube is connected to the alarm circuit through the fourth resistor;

[0017] Wherein, the anode of the first light-emitting diode serves as the second end of the detection circuit, the first end of the unidirectional thyristor serves as the first end of the detection circuit, and the third end of the first switching tube serves as the third end of the detection circuit.

[0018] In some embodiments, when at least one of the sub-ribbon cables in the ribbon cable is broken, control the second switch to conduct and the first switch to disconnect. The unidirectional thyristor disconnects, the first light-emitting diode does not emit light, the first switching tube conducts, and the second light-emitting diode is used to generate the first optical signal, and the alarm circuit generates an alarm signal.

[0019] In some embodiments, when none of the sub-ribbon cables in the ribbon cable is broken, control the first switch to conduct and then disconnect. The unidirectional thyristor conducts, and the first light-emitting diode is used to generate a second optical signal.

[0020] In some embodiments, the alarm circuit includes:

[0021] A fifth resistor, one end of the fifth resistor is connected to the second end of the second switch, and the other end of the fifth resistor is connected to the fourth resistor;

[0022] An optocoupler, a first end of the optocoupler is connected between the fifth resistor and the second switch through a sixth resistor, a second end of the optocoupler is connected between the fourth resistor and the fifth resistor, and a third end of the optocoupler is connected between the fifth resistor and the sixth resistor through a seventh resistor;

[0023] A buzzer, one end of the buzzer is connected to a fourth end of the optocoupler, and the other end of the buzzer is grounded. The buzzer is used to generate an alarm signal when at least one of the sub-ribbons in the ribbon cable is broken.

[0024] In some embodiments, when at least one of the sub-ribbons in the ribbon cable is broken, the second switch is controlled to conduct and the first switch is turned off, the unilateral thyristor is turned off, the first switching tube conducts, the third end and the fourth end of the optocoupler conduct, and the buzzer generates the alarm signal.

[0025] In some embodiments, when none of the sub-ribbons in the ribbon cable is broken, the first switch is controlled to conduct and then turn off, the unilateral thyristor conducts, the first switching tube is cut off, the third end and the fourth end of the optocoupler are turned off, and the buzzer stops working.

[0026] In some embodiments, the second voltage is greater than the first voltage, and the third voltage is less than the first voltage.

[0027] In some embodiments, the detection circuit further includes a first diode, an anode of the first diode is connected to a second end of the first switch, and a cathode of the first diode is connected to a first end of the unilateral thyristor.

[0028] The present application further provides a detection device, including the above-mentioned open-circuit detection circuit.

[0029] The beneficial effects of the present application are as follows: In the present application, multiple sub-ribbons correspond to multiple detection circuits, and multiple detection circuits are all connected to the alarm circuit; when a sub-ribbon is broken, the alarm circuit generates an alarm signal and locks the alarm signal, and the detection circuit corresponding to the sub-ribbon generates a first optical signal. Through the collaborative work of the alarm circuit and multiple detection circuits, when at least one sub-ribbon of the ribbon cable is broken, an alarm signal and a first optical signal can be received in time, and the open-circuit state of the ribbon cable can be more intuitively and timely feedback according to the alarm signal and the first optical signal, so that the open-circuit of the ribbon cable can be quickly responded to and corresponding measures can be taken in time; when the ribbon cable is in a virtual open state, the probability of misjudgment is reduced. Description of the Drawings

[0030] To more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings. Among them:

[0031] Figure 1 It is a circuit schematic diagram of an embodiment of the disconnection detection circuit provided by the present application. Specific embodiments

[0032] The embodiments of the technical solutions of the present application will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specifically and clearly defined.

[0035] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] Currently, when detecting a broken wire in a flexible cable, the on / off change of a light-emitting diode is used to feedback the state of the flexible cable. In some cases, such as when the ambient light is poor or the ambient light is complex, this technical solution is not intuitive and timely enough to feedback the broken wire state of the flexible cable, and it may be difficult for testers to quickly react to the broken wire of the flexible cable, resulting in the inability to take corresponding measures in time.

[0038] Please refer to Figure 1 as shown in Figure 1 FIG. is a circuit schematic diagram of an embodiment of a broken wire detection circuit provided by the present application. The broken wire detection circuit 10 of the present application is applied to detect a flexible cable 20. The flexible cable 20 includes a plurality of sub-flexible cables, such as sub-flexible cable L1, sub-flexible cable L2, sub-flexible cable L3,..., sub-flexible cable Ln. One end of all the sub-flexible cables receives a first voltage U1, and n is an integer greater than or equal to 1.

[0039] The flexible cable 20 refers to an assembly of a cable or wires, which are organized into one or more rows and are usually encapsulated in a common sheath. The flexible cable 20 can be a flat ribbon cable or a round multi-core cable. Applications of the flexible cable 20 include but are not limited to connecting circuit boards, components, sensors, monitoring instruments, or diagnostic devices.

[0040] The broken wire detection circuit 10 of this embodiment includes a first switch SW1, a first resistor R1, a plurality of detection circuits, a second switch SW2, and an alarm circuit 30.

[0041] Among them, the first end of the first switch SW1 receives a second voltage U2 through the first resistor R1, that is, the first end of the first switch SW1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 receives the second voltage U2.

[0042] The plurality of detection circuits correspond to the plurality of sub-flexible cables one by one. The first end of the detection circuit is connected to the second end of the first switch SW1, and the second end of the detection circuit is connected to the corresponding sub-flexible cable. For example, the plurality of detection circuits include detection circuit M1, detection circuit M2, detection circuit M3,..., detection circuit Mn; detection circuit M1 corresponds to sub-flexible cable L1, detection circuit M2 corresponds to sub-flexible cable L2, detection circuit M3 corresponds to sub-flexible cable L3,..., detection circuit Mn corresponds to sub-flexible cable Ln; that is, the first end of the detection circuit M1 is connected to the second end of the first switch SW1, and the second end of the detection circuit M1 is connected to the sub-flexible cable L1; the first end of the detection circuit M2 is connected to the second end of the first switch SW1, and the second end of the detection circuit M2 is connected to the sub-flexible cable L2; the first end of the detection circuit M3 is connected to the second end of the first switch SW1, and the second end of the detection circuit M3 is connected to the sub-flexible cable L3; until the first end of the detection circuit Mn is connected to the second end of the first switch SW1, and the second end of the detection circuit Mn is connected to the sub-flexible cable Ln.

[0043] The first end of the second switch SW2 receives the third voltage U3. The second end of the second switch SW2 is connected to the alarm circuit 30. The third ends of all the detection circuits are connected to the alarm circuit 30, that is, the third end of the detection circuit M1 is connected to the alarm circuit 30, the third end of the detection circuit M2 is connected to the alarm circuit 30, the third end of the detection circuit M3 is connected to the alarm circuit 30,..., and the third end of the detection circuit Mn is connected to the alarm circuit 30.

[0044] Wherein, the second voltage U2 is greater than the first voltage U1, and the third voltage U3 is less than the first voltage U1.

[0045] By setting the second voltage U2 higher than the first voltage U1 and the third voltage U3 lower than the first voltage U1 with the first voltage U1 as a reference, when the detection cable 20 is broken, the broken wire detection circuit 10 is protected from overvoltage damage, and the reliability and safety of the broken wire detection circuit 10 are improved.

[0046] When at least one sub-cable in the cable 20 is broken, control the second switch SW2 to conduct and the first switch SW1 to disconnect. The alarm circuit 30 generates an alarm signal and locks the alarm signal. The corresponding detection circuit generates a first optical signal to locate the broken sub-cable according to the first optical signal.

[0047] Specifically, when at least one sub-cable in the cable 20 is broken, control the second switch SW2 to conduct and the first switch SW1 to disconnect. The alarm circuit 30 generates an alarm signal and locks the alarm signal. If the detection circuit M1 generates a first optical signal at this time, then the broken sub-cable can be located as the sub-cable L1 corresponding to the detection circuit M1 according to the first optical signal.

[0048] In this embodiment, multiple sub-cables are correspondingly connected to multiple detection circuits, and multiple detection circuits are all connected to the alarm circuit 30; when a sub-cable is broken, the alarm circuit 30 generates an alarm signal and locks the alarm signal, and the detection circuit corresponding to the sub-cable generates a first optical signal. Through the collaborative work of the alarm circuit 30 and multiple detection circuits, when at least one sub-cable of the cable 20 is broken, an alarm signal and a first optical signal can be received in time. According to the alarm signal and the first optical signal, the broken state of the cable 20 can be more intuitively and timely feedback, so that the cable 20 can be quickly responded to when it is broken, and corresponding measures can be taken in time; when the cable 20 is in a virtual open state, the probability of misjudgment is reduced.

[0049] According to some embodiments of the present application, the detection circuit M1 of this embodiment includes a thyristor S1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first light-emitting diode LED1, a second light-emitting diode LED2, and a first switching transistor Q1. The other detection circuits in the multiple detection circuits are the same as the detection circuit M1, and will not be elaborated one by one here.

[0050] Wherein, the first end of the thyristor S1 is connected to the second end of the first switch SW1, and the second end of the thyristor S1 is grounded through the second resistor R2 and the third resistor R3; the anode of the first light-emitting diode LED1 is connected to the other end of the sub-wiring harness, and the cathode of the first light-emitting diode LED1 is connected to the third end of the thyristor S1; the first end of the first switching transistor Q1 is connected to one end of the third resistor R3, the second end of the first switching transistor Q1 is connected to the other end of the third resistor R3 through the second light-emitting diode Q2, and the third end of the first switching transistor Q1 is connected to the alarm circuit 30 through the fourth resistor R4.

[0051] Wherein, the anode of the first light-emitting diode LED1 serves as the second end of the detection circuit M1, and the second end of the detection circuit M1 is connected to the other end of the sub-wiring harness L1; the first end of the thyristor S1 serves as the first end of the detection circuit M1, and the first end of the detection circuit M1 is connected to the second end of the first switch SW1; the third end of the first switching transistor Q1 serves as the third end of the detection circuit M1, and the third end of the detection circuit M1 is connected to the alarm circuit 30.

[0052] In this embodiment, the second resistor R2 and the third resistor R3 are current-limiting resistors to protect the thyristor S1 from being broken down by overvoltage; the first light-emitting diode LED1 and the second light-emitting diode LED2 provide visual feedback.

[0053] According to some embodiments of the present application, when all the sub-wiring harnesses in the wiring harness 20 are not broken, after controlling the first switch SW1 to conduct and then disconnect, the thyristor S1 conducts, and the first light-emitting diode LED1 is used to generate a second optical signal.

[0054] Specifically, when all the sub-wiring harnesses in the wiring harness 20 are not broken, after controlling the first switch SW1 to conduct and then disconnect, the second voltage U2 reaches the first end of the thyristor S1, and the thyristor S1 conducts. At this time, the first light-emitting diode LED1 emits light, that is, the first light-emitting diode LED1 generates a second optical signal.

[0055] According to some embodiments of the present application, when at least one sub-wiring harness in the wiring harness 20 is broken, control the second switch SW2 to conduct and the first switch SW1 to disconnect. The thyristor S1 disconnects, the first light-emitting diode LED1 does not emit light, the first switching transistor Q1 conducts, the second light-emitting diode LED2 is used to generate a first optical signal, and the alarm circuit 30 generates an alarm signal.

[0056] Specifically, when the sub-ribbon cable L1 is broken, the first switching transistor SW1 is controlled to turn off and the second switch SW2 is turned on. At this time, the thyristor S1 is turned off, the first light-emitting diode LED1 is extinguished, the first switching transistor Q1 is turned on, and the second light-emitting diode LED2 emits light. That is, the second light-emitting diode LED2 generates a first optical signal, and the alarm circuit 30 generates an alarm signal.

[0057] Optionally, the first light-emitting diode LED1 generates a second optical signal that is green, and the second light-emitting diode LED2 generates a first optical signal that is red. In other embodiments, the types of the first optical signal and the second optical signal are set according to actual situations.

[0058] By providing the first light-emitting diode LED1 and the second light-emitting diode LED2 to respectively generate a second optical signal and a first optical signal, and there is a difference between the first optical signal and the second optical signal. When the ribbon cable 20 is broken, the state of the ribbon cable 20 can be fed back more obviously and intuitively according to the second optical signal.

[0059] According to some embodiments of the present application, the alarm circuit 30 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an optocoupler OC, and a buzzer B.

[0060] Among them, one end of the fifth resistor R5 is connected to the second end of the second switch SW2, and the other end of the fifth resistor R5 is connected to the fourth resistor R4; the first end of the optocoupler OC is connected between the fifth resistor R5 and the second switch SW2 through the sixth resistor R6, the second end of the optocoupler OC is connected between the fourth resistor R4 and the fifth resistor R5, and the third end of the optocoupler OC is connected between the fifth resistor R5 and the sixth resistor R6 through the seventh resistor R7; one end of the buzzer B is connected to the fourth end of the optocoupler OC, and the other end of the buzzer B is grounded. The buzzer B is used to generate an alarm signal when at least one sub-ribbon cable in the ribbon cable 20 is broken.

[0061] The optocoupler OC is also called an opto-isolator, abbreviated as an optocoupler, and is an electro-optical-electrical conversion device that transmits electrical signals through light. The optocoupler consists of a light source and a light receiver. The light source and the light receiver are assembled in the same sealed housing and isolated from each other by a transparent insulator. The pins of the light source are the input terminals, and the pins of the light receiver are the output terminals. Common light sources are light-emitting diodes, and light receivers are photosensitive diodes, photosensitive transistors, etc.

[0062] For example, in this embodiment, the optocoupler OC is composed of a light-emitting diode and a photosensitive transistor. The light-emitting diode is located at the input terminal, also called the primary side; the photosensitive transistor is the output terminal, also called the secondary side.

[0063] According to some embodiments of the present application, when there is no disconnection in all the sub-ribbon cables in the ribbon cable 20, after controlling the first switch SW1 to conduct and then disconnect, the unidirectional thyristor S1 conducts, the first switching transistor Q1 is cut off, the third and fourth terminals of the optocoupler OC are disconnected, and the buzzer B stops working.

[0064] Specifically, when there is no disconnection in all the sub-ribbon cables in the ribbon cable 20, after controlling the first switch SW1 to conduct and then disconnect, the unidirectional thyristor S1 conducts. At this time, the first switching transistor Q1 is cut off, the second light-emitting diode LED2 does not emit light, there is no current in the primary side of the optocoupler OC, the secondary side is not conducting, that is, the third and fourth terminals of the optocoupler OC are disconnected, and the buzzer B does not give an alarm, that is, the buzzer B stops working.

[0065] According to some embodiments of the present application, when at least one sub-ribbon cable in the ribbon cable 20 is disconnected, control the second switch SW2 to conduct and the first switch SW1 to disconnect, the unidirectional thyristor S1 is disconnected, the first switching transistor Q1 conducts, the third and fourth terminals of the optocoupler OC conduct, and the buzzer B generates an alarm signal.

[0066] Specifically, when the sub-ribbon cable L1 is disconnected, control the first switch SW1 to disconnect and the second switch SW2 to conduct. At this time, the unidirectional thyristor S1 is disconnected, the first light-emitting diode LED1 goes out, the first switching transistor Q1 conducts, and the second light-emitting diode LED2 emits light; the current in the primary side of the optocoupler OC is large, the secondary side conducts, that is, the third and fourth terminals of the optocoupler OC conduct; the buzzer B gives an alarm, that is, the buzzer B generates an alarm signal.

[0067] By controlling the conduction of the optocoupler OC in the alarm circuit 30 to make the buzzer B generate an alarm signal, when at least one sub-ribbon cable in the ribbon cable 20 is disconnected, the buzzer B in the alarm circuit 30 gives an alarm, increasing the auditory feedback and making the response more timely.

[0068] Optionally, the first terminal of the unidirectional thyristor S1 is the control electrode of the unidirectional thyristor S1. If the sub-ribbon cable is disconnected, but due to repeated movement during the disconnection detection, the sub-ribbon cables are in a virtual connection, that is, when the sub-ribbon cable is in a virtual disconnection, since the first switch SW1 is disconnected at this time, there is no voltage at the control electrode of the unidirectional thyristor S1, the first switching transistor Q1 cannot conduct again, the first light-emitting diode LED1 remains off, the second light-emitting diode LED2 remains on, and the buzzer B remains in an alarm state; that is, the alarm signal is locked to avoid misjudgment.

[0069] According to some embodiments of the present application, the detection circuit M1 of this embodiment further includes a first diode D1. The anode of the first diode D1 is connected to the second terminal of the first switch SW1, and the cathode of the first diode D1 is connected to the first terminal of the unidirectional thyristor S1.

[0070] By adding a first diode D1 between the first end of the unilateral thyristor S1 and the first switch SW1, when the first sub-wiring L1 is disconnected, the leakage current flow direction of the unilateral thyristor S1 is controlled, so as to control the second light-emitting diode LED2 to generate a first optical signal. The first diode D1 can prevent the leakage current of the unilateral thyristor S1 from flowing to other detection circuits.

[0071] Optionally, the first switch SW1 of the present application is a spring switch. In other embodiments, the first switch SW1 is set according to actual situations, which will not be elaborated here.

[0072] The present application also provides a detection device, which includes but is not limited to a wiring tester or a disconnection detector, etc. The detection device of this embodiment includes the disconnection detection circuit 10 of the above embodiment, which will not be elaborated here.

[0073] In summary, through the collaborative work of the alarm circuit 30 and multiple detection circuits, when at least one sub-wiring of the wiring 20 is disconnected, the present application can timely receive an alarm signal and a first optical signal, and can more intuitively and timely feedback the disconnection state of the wiring 20 according to the alarm signal and the first optical signal, so as to quickly react to the disconnection of the wiring 20 and take corresponding measures in time; when the wiring 20 has a virtual disconnection, the probability of misjudgment is reduced.

[0074] The above are only the embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A wire break detection circuit, characterized in that, Applied to detect a flexible cable, the flexible cable includes a plurality of sub-flexible cables, one end of each sub-flexible cable receives a first voltage, and the open-circuit detection circuit includes: A first switch and a first resistor, the first end of the first switch receives a second voltage through the first resistor; A plurality of detection circuits, corresponding to the plurality of sub-flexible cables one by one, the first end of the detection circuit is connected to the second end of the first switch, and the second end of the detection circuit is connected to the corresponding sub-flexible cable; A second switch and an alarm circuit, the first end of the second switch receives a third voltage, the second end of the second switch is connected to the alarm circuit, and the third ends of all the detection circuits are connected to the alarm circuit; When at least one of the sub-flexible cables in the flexible cable is open-circuited, control the second switch to conduct and the first switch to disconnect, the alarm circuit generates an alarm signal and locks the alarm signal, and the corresponding detection circuit generates a first optical signal to locate the open-circuited sub-flexible cable according to the first optical signal.

2. The disconnection detection circuit according to claim 1, characterized in that The detection circuit includes: A unilateral thyristor, the first end of the unilateral thyristor is connected to the second end of the first switch, and the second end of the unilateral thyristor is grounded through a second resistor and a third resistor; A first light-emitting diode, the anode of the first light-emitting diode is connected to the other end of the sub-flexible cable, and the cathode of the first light-emitting diode is connected to the third end of the unilateral thyristor; A first switching transistor, the first end of the first switching transistor is connected to one end of the third resistor; A second light-emitting diode, the second end of the first switching transistor is connected to the other end of the third resistor through the second light-emitting diode; A fourth resistor, the third end of the first switching transistor is connected to the alarm circuit through the fourth resistor; Wherein, the anode of the first light-emitting diode serves as the second end of the detection circuit, the first end of the unilateral thyristor serves as the first end of the detection circuit, and the third end of the first switching transistor serves as the third end of the detection circuit.

3. The wire break detection circuit according to claim 2, wherein When at least one of the sub-flexible cables in the flexible cable is open-circuited, control the second switch to conduct and the first switch to disconnect, the unilateral thyristor disconnects, the first light-emitting diode does not emit light, the first switching transistor conducts, the second light-emitting diode is used to generate the first optical signal, and the alarm circuit generates an alarm signal.

4. The disconnection detection circuit according to claim 2, wherein When all the sub-flexible cables in the flexible cable are not open-circuited, control the first switch to conduct and then disconnect, the unilateral thyristor conducts, and the first light-emitting diode is used to generate a second optical signal.

5. The disconnection detection circuit according to claim 2, characterized in that, The alarm circuit includes: A fifth resistor, one end of the fifth resistor is connected to the second end of the second switch, and the other end of the fifth resistor is connected to the fourth resistor; An optocoupler, the first end of the optocoupler is connected between the fifth resistor and the second switch through a sixth resistor, the second end of the optocoupler is connected between the fourth resistor and the fifth resistor, and the third end of the optocoupler is connected between the fifth resistor and the sixth resistor through a seventh resistor; A buzzer, one end of the buzzer is connected to the fourth end of the optocoupler, the other end of the buzzer is grounded, and the buzzer is used to generate the alarm signal when at least one of the sub-ribbons in the ribbon cable is broken.

6. The disconnection detection circuit according to claim 5, characterized in that, When at least one of the sub-ribbons in the ribbon cable is broken, control the second switch to conduct and the first switch to disconnect, the unilateral thyristor to disconnect, the first switching tube to conduct, the third end and the fourth end of the optocoupler to conduct, and the buzzer to generate the alarm signal.

7. The wire break detection circuit according to claim 5, wherein When all the sub-ribbons in the ribbon cable are not broken, control the first switch to conduct and then disconnect, the unilateral thyristor to conduct, the first switching tube to cut off, the third end and the fourth end of the optocoupler to disconnect, and the buzzer to stop working.

8. The disconnection detection circuit according to claim 1, wherein The second voltage is greater than the first voltage, and the third voltage is less than the first voltage.

9. The disconnection detection circuit according to claim 2, wherein The detection circuit further includes a first diode, the anode of the first diode is connected to the second end of the first switch, and the cathode of the first diode is connected to the first end of the unilateral thyristor.

10. A detection device, characterized in that, The detection device includes: the breakage detection circuit according to any one of claims 1-9.

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