Elevator landing door and car door lock short circuit detection circuit
By designing a short-circuit detection circuit for elevator hall and car door locks, and utilizing a diode reverse conduction design and a voltage detection module, changes in elevator door lock voltage signals are accurately detected, solving the problem of undetected elevator door lock short circuits and improving elevator operation safety.
Patent Information
- Application Number
- CN202422457088.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-10-10
AI Technical Summary
In existing technology, the short circuit between the elevator car door and the hall door locks is not effectively detected, which may cause the elevator to move when the doors are open, leading to safety accidents.
Design a short-circuit detection circuit for elevator hall door and car door locks. Connect the electrical detection point and the common terminal through a voltage detection module. Utilize the reverse conduction direction design of diodes to accurately detect changes in the door lock voltage signal and determine short-circuit faults.
It improves the safety index of elevator operation, and can detect and report door lock short circuit faults in a timely manner to avoid safety accidents.
Smart Images
Figure CN223597868U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The embodiment of the present application relates to the field of circuit, in particular to an elevator hall door and car door lock short-circuit detection circuit. BACKGROUND
[0002] The elevator is a kind of equipment vertically moving between different floors in the shaft, and the elevator car has a car door, and the shaft wall is provided with a hall door corresponding to each floor surface, and the opening of the car door and the hall door can allow passengers to get on and off the car.
[0003] The car accidental movement refers to the movement of the car without instruction leaving the landing in the unlocking area and the open door state, and does not include the movement caused by loading and unloading. When the elevator is double-door, if the front car door lock and the rear car door lock or the front hall door lock and the rear hall door lock are short-circuited and are not detected, the elevator can move out of the door area in the open door state, resulting in a safety accident. CONTENT OF THE UTILITY MODEL
[0004] The purpose of the embodiment of the present application is to provide an elevator hall door and car door lock short-circuit detection circuit, which can accurately detect whether short-circuit occurs according to the change of the voltage signal when the front hall door lock and the rear hall door lock are short-circuited or the front car door lock and the rear car door lock are short-circuited, and improve the safety index of the elevator operation.
[0005] To solve the above technical problems, an embodiment of the present application provides an elevator hall door lock short-circuit detection circuit, which comprises a first electrical detection point, a second electrical detection point, a first common end, a front hall door lock, a rear hall door lock, a first diode, a second diode and a voltage detection module.
[0006] The first connecting end of the front hall door lock is connected with the first electrical detection point, and the second connecting end of the front hall door lock is connected with the first common end through the first diode in series.
[0007] The third connecting end of the rear hall door lock is connected with the second electrical detection point, and the fourth connecting end of the rear hall door lock is connected to the connecting line between the first diode and the first common end through the first connecting point after the second diode in series, and the conduction direction of the second diode and the first diode in the circuit is opposite.
[0008] The voltage detection module is connected with the first electrical detection point, the second electrical detection point and the first common end respectively, and is used for detecting the voltage signals of the front hall door lock and the rear hall door lock.
[0009] In the elevator hall door lock short circuit detection circuit as described above, the second connection end of the front hall door lock is connected to the first common end after being connected to the first diode in series, comprising: the second connection end of the front hall door lock is connected to the negative electrode of the first diode, and the positive electrode of the first diode is connected to the first common end.
[0010] In the elevator hall door lock short circuit detection circuit as described above, the fourth connection end of the rear hall door lock is connected to the first connection point after being connected to the second diode in series, comprising: the fourth connection end of the rear hall door lock is connected to the negative electrode of the second diode, and the positive electrode of the second diode is connected to the first connection point.
[0011] In the elevator hall door lock short circuit detection circuit as described above, the second connection end of the front hall door lock is connected to the first common end after being connected to the first diode in series, comprising: the second connection end of the front hall door lock is connected to the negative electrode of the first diode, and the positive electrode of the first diode is connected to the first common end.
[0012] In the elevator hall door lock short circuit detection circuit as described above, the fourth connection end of the rear hall door lock is connected to the first connection point after being connected to the second diode in series, comprising: the fourth connection end of the rear hall door lock is connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the first connection point.
[0013] Another embodiment of the present application relates to an elevator car door lock short circuit detection circuit, characterized in that it comprises: a third electrical detection point, a fourth electrical detection point, a second common end, a front car door lock, a rear car door lock, a third diode, a fourth diode, and a voltage detection module.
[0014] The fifth connection end of the front car door lock is connected to the third electrical detection point, and the sixth connection end of the front car door lock is connected to the second common end after being connected to the third diode in series.
[0015] The seventh connection end of the rear car door lock is connected to the fourth electrical detection point, and the eighth connection end of the rear car door lock is connected to the connection line in which the third diode and the second common end are connected through the second connection point after being connected to the fourth diode in series; wherein the fourth diode and the third diode are connected in opposite directions in the circuit.
[0016] The voltage detection module is connected to the third electrical detection point, the fourth electrical detection point, and the second common end respectively, and is used for detecting the voltage signals of the front car door lock and the rear car door lock respectively.
[0017] In the elevator car door lock short circuit detection circuit as described above, the sixth connection end of the front car door lock is connected to the second common end after being connected in series with the third diode, comprising: the sixth connection end of the front car door lock is connected to the negative electrode of the third diode, and the positive electrode of the third diode is connected to the second common end.
[0018] In the elevator car door lock short circuit detection circuit as described above, the eighth connection end of the rear car door lock is connected in series with the fourth diode, comprising: the eighth connection end of the rear car door lock is connected to the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected to the second connection point.
[0019] In the elevator car door lock short circuit detection circuit as described above, the sixth connection end of the front car door lock is connected to the second common end after being connected in series with the third diode, comprising: the sixth connection end of the front car door lock is connected to the negative electrode of the third diode, and the positive electrode of the third diode is connected to the second common end.
[0020] In the elevator car door lock short circuit detection circuit as described above, the eighth connection end of the rear car door lock is connected in series with the fourth diode, comprising: the eighth connection end of the rear car door lock is connected to the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected to the second connection point.
[0021] The voltage signal state of the front hall door lock can be acquired by connecting the first electrical detection point and the first common end through the voltage detection module, the voltage signal state of the rear hall door lock can be acquired by connecting the second electrical detection point and the first common end through the voltage detection module, and whether the front hall door lock and the rear hall door lock are short-circuited can be directly judged through the voltage signal state of the front hall door lock and the voltage signal state of the rear hall door lock. Compared with the prior art, the safety index of the elevator operation can be improved. BRIEF DESCRIPTION OF DRAWINGS
[0022] One or more embodiments are illustrated by way of example in the figures that are part of this document and which illustrate principles of embodiments. Such illustrations are not to be considered limiting of the principles of the embodiments, as those skilled in the art will appreciate that other embodiments can be made and implemented without departing from the scope of the present disclosure. Where identical elements are illustrated in different figures, the identical reference numbers are used in those figures.
[0023] Figure 1 is a structure schematic of an elevator hall door lock short circuit detection circuit according to an embodiment of the present application Figure 1 ;
[0024] Figure 2 is a voltage change waveform according to an embodiment of the present application Figure 1 ;
[0025] Figure 3 is a voltage variation waveform provided according to an embodiment of the present application Figure 2
[0026] Figure 4 is a voltage variation waveform diagram when the hall door lock is short-circuited according to an embodiment of the present application
[0027] Figure 5 is a schematic structural diagram of an elevator hall door lock short-circuit detection circuit according to another embodiment of the present application Figure 2
[0028] Figure 6 is a schematic structural diagram of an elevator car door lock short-circuit detection circuit according to still another embodiment of the present application DETAILED DESCRIPTION
[0029] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are proposed in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments. The division of the following embodiments is for the convenience of description, and should not constitute any limitation on the specific implementation of the present application, and the embodiments can be combined and referenced with each other on the premise of not contradicting.
[0030] One embodiment of the present application relates to an elevator hall door lock short-circuit detection circuit, as shown in Figure 1 , comprising: a first electrical detection point 1, a second electrical detection point 2, a first common end 3, a front hall door lock 4, a rear hall door lock 5, a first diode 6, a second diode 7, and a voltage detection module 8.
[0031] The first connection end of the front hall door lock 4 is connected to the first electrical detection point 1, and the second connection end of the front hall door lock 4 is connected to the first common end 3 after being connected in series with the first diode 6.
[0032] The third connection end of the rear hall door lock 5 is connected to the second electrical detection point 2, and the fourth connection end of the rear hall door lock 5 is connected to the connection line between the first diode 6 and the first common end 3 through the first connection point after being connected in series with the second diode 7; wherein the second diode 7 and the first diode 6 are connected in the opposite conduction direction in the circuit.
[0033] The voltage detection module 8 is connected to the first electrical detection point 1, the second electrical detection point 2, and the first common end 3, respectively, and is used for detecting the voltage signals of the front hall door lock 4 and the rear hall door lock 5.
[0034] Specifically, generally speaking, short circuit refers to that two ends of two electrical appliances or power sources in a circuit are directly connected by a wire, resulting in that current bypasses the electrical appliances and does not light or goes out. During the operation of an elevator, there is a special fault, i.e., door lock short circuit fault. The judgment logic of this fault is that if it is detected that the door lock is open after the door is opened, it is proved that the short circuit fault occurs. There are multiple reasons for detecting the occurrence of the short circuit fault, and the most common one is that a short circuit occurs between the door locks. Since the electrical detection points connected with the door locks are generally metal contacts, and the electrical detection points of the door locks of the front and rear hall doors of a double-door elevator are very close, the metal of the electrical detection points leaks out due to rough manufacturing process or long use, and the two electrical detection points are connected, causing a short circuit between the door locks of the front and rear hall doors. The short circuit in the embodiment refers to that a short circuit occurs between the first electrical detection point 1 and the second electrical detection point 2, i.e., a short circuit occurs between the door lock 4 of the front hall door and the door lock 5 of the rear hall door, and the position of the short circuit can be between the first electrical detection point 1 and the first diode 6 and between the second electrical detection point 2 and the second diode 7.
[0035] In a normal case where no short circuit occurs and the door lock is closed during the normal operation of the elevator, the door lock loop of the elevator is generally powered by a sinusoidal alternating current. At this time, according to the circuit structure as shown in Figure 1 , the voltage detection module 8 detects that the voltage condition between the first electrical detection point 1 and the first common end 3 changes as shown in Figure 2 in a sinusoidal wave period, and the voltage detection module 8 detects that the voltage condition between the second electrical detection point 2 and the first common end 3 changes as shown in Figure 3 in a sinusoidal wave period.
[0036] At this time, referring to the circuit structure as shown in Figure 1 , if a short circuit occurs between the door lock 4 of the front hall door and the door lock 5 of the rear hall door, the voltage detection module 8 detects that the voltage signals between the first electrical detection point 1 and the first common end 3 and between the second electrical detection point 2 and the first common end 3 change as shown in Figure 4 in the same sinusoidal wave period. It should be noted that, unless otherwise specified, each embodiment of the present scheme is directed to the case where each door lock is closed, which will not be described hereinafter.
[0037] Therefore, according to the circuit structure in the present scheme, the change of the voltage signal can be reflected when a short circuit occurs between the first electrical detection point 1 and the second electrical detection point 2, i.e., when a short circuit occurs between the door lock 4 of the front hall door and the door lock 5 of the rear hall door, so that the occurrence of the door lock short circuit fault can be accurately determined.
[0038] In one example, as shown in Figure 1As shown, the specific connection structure that the second connection end of the front door lock 4 is connected with the first common end 3 after the first diode 6 in series can be that the second connection end of the front door lock 4 is connected with the positive electrode of the first diode 6, and the negative electrode of the first diode 6 is connected with the first common end 3.
[0039] Correspondingly, at this time, the fourth connection end of the back door lock 5 needs to be connected with the negative electrode of the second diode 7, and the positive electrode of the second diode 7 is connected with the first connection point.
[0040] Specifically, through the above connection mode, the first diode 6 and the second diode 7 can be connected in the circuit in different conduction directions. In the circuit structure as shown in Figure 1 In the circuit structure, taking one sine wave period as an example, the voltage condition between the first electrical detection point 1 and the first common end 3 is as shown in Figure 2 As shown, in the T1 period, the forward power current flows from the first electrical detection point 1 to the first diode 6 through the front door lock 4, at this time, the first diode 6 can be turned on, and the current flows to the first common end 3 through the first diode 6, so that at this time, the first electrical detection point 1 and the first common end 3 have a forward voltage signal; in the T2 period, the current is reversed, and wants to flow from the first common end 3 to the first electrical detection point 1, but at this time, the first diode 6 is in the off state, and the current cannot pass, so that at this time, the first electrical detection point 1 and the first common end 3 do not have a voltage signal. In the T3 period, the power current is reversed again, and flows from the first electrical detection point 1 to the first diode 6 through the front door lock 4, at this time, the first diode 6 can be turned on, and the current flows to the first common end 3 through the first diode 6, so that at this time, the first electrical detection point 1 and the first common end 3 have a forward voltage signal; in the T4 period, the current is reversed again, and wants to flow from the first common end 3 to the first electrical detection point 1, but at this time, the first diode 6 is in the off state, and the current cannot pass, so that at this time, the first electrical detection point 1 and the first common end 3 do not have a voltage signal.
[0041] Correspondingly, in the circuit structure as shown in Figure 1 In the circuit structure, taking one sine wave period as an example, the voltage condition between the second electrical detection point 2 and the first common end 3 is as shown in Figure 3As shown, in the T1 period, the power supply current flows from the second electrical detection point 2 to the back hall door lock 5, and at this time, the second diode 7 is cut off, and the current cannot pass through, so at this time, the second electrical detection point 2 and the first common end 3 do not have a voltage signal; in the T2 period, the current is reversed, and the current from the first common end 3 wants to flow to the second electrical detection point 2, at this time, the second diode 7 is in a conducting state, and the current flows to the second electrical detection point 2 through the second diode 7, so at this time, the second electrical detection point 2 and the first common end 3 have a negative voltage signal; in the T3 period, the power supply current is reversed again, and flows from the second electrical detection point 2 to the first common end 3 through the back hall door lock 5, but at this time, the second diode 7 is cut off again, and the current cannot pass through, so at this time, the second electrical detection point 2 and the first common end 3 do not have a voltage signal; and in the T4 period, the current is reversed again, and flows from the first common end 3 to the second electrical detection point 2, at this time, the second diode 7 is in a conducting state, and the current can flow to the second electrical detection point 2 through the second diode 7, so at this time, the second electrical detection point 2 and the first common end 3 have a negative voltage signal.
[0042] However, if a short circuit occurs between the front hall door lock 4 and the back hall door lock 5, the voltage signal graph between the first electrical detection point 1 and the first common end 3 is as shown in Figure 4 Specifically, if a short circuit occurs, in the T2 period, when the current is reversed for the first time, although the current cannot pass through the first diode 6 to flow to the first electrical detection point 1, since at this time, the second diode 7 is in a conducting state, and a short circuit occurs between the front hall door lock 4 and the back hall door lock 5, the current can pass through the second diode 7, the back hall door lock 5 and the short circuit line to flow to the first electrical detection point 1. At this time, the voltage detection module 8 can detect that the first electrical detection point 1 and the first common end 3 have a negative voltage signal, and the T4 period is the same. In another example, as shown in Figure 5 The specific connection structure of the second connection end of the front hall door lock 4 connected to the first common end 3 after the first diode 6 in series can be that the second connection end of the front hall door lock 4 is connected to the negative electrode of the first diode 6, and the positive electrode of the first diode 6 is connected to the first common end 3.
[0043] Correspondingly, at this time, the fourth connection end of the back hall door lock 5 needs to be connected to the positive electrode of the second diode 7, and the negative electrode of the second diode 7 is connected to the first connection point.
[0044] Specifically, the voltage conditions between the first electrical detection point 1, the second electrical detection point 2 and the first common end 3 measured by the circuit structure as shown in Figure 5 are exactly opposite to the voltage conditions between the first electrical detection point 1, the second electrical detection point 2 and the first common end 3 measured by the circuit structure as shown in Figure 1 .
[0045] In such Figure 5 In the circuit structure, taking one sine wave cycle as an example, the voltage condition between the first electrical detection point 1 and the first common terminal 3 is as follows: Figure 3 As shown. Specifically, during period T1, the positive current flows from the first electrical detection point 1 through the front hall door lock 4 to the first diode 6. At this time, the first diode 6 is cut off, and the current cannot pass through. Therefore, there is no voltage signal between the first electrical detection point 1 and the first common terminal 3. During period T2, the current reverses, starting from the first common terminal 3 and attempting to flow to the first electrical detection point 1. At this time, the first diode 6 is in a conducting state, and the current flows through the first diode 6 to the first electrical detection point 1. Therefore, there is a negative voltage signal between the first electrical detection point 1 and the first common terminal 3. During period T3... The internal current reverses again, and the positive power supply current flows from the first electrical detection point 1 through the front hall door lock 4 to the first diode 6. At this time, the first diode 6 is cut off again, and the current cannot pass through. Therefore, there is no voltage signal between the first electrical detection point 1 and the first common terminal 3. During the T4 period, the internal current reverses again, starting from the first common terminal 3 and wanting to flow to the first electrical detection point 1. At this time, the first diode 6 is in the conducting state, and the current flows through the first diode 6 to the first electrical detection point 1. Therefore, there is a negative voltage signal between the first electrical detection point 1 and the first common terminal 3.
[0046] Accordingly, in such Figure 5 In the circuit structure, taking one sine wave cycle as an example, the voltage condition between the second electrical detection point 2 and the first common terminal 3 is as follows: Figure 2 As shown. Specifically, during period T1, the power supply current flows from the second electrical detection point 2 through the back hall door lock 5 to the second diode 7. At this time, the second diode 7 can conduct, and the current flows through the second diode 7 to the first common terminal 3. Therefore, there is a positive voltage signal between the second electrical detection point 2 and the first common terminal 3. During period T2, the current reverses, starting from the first common terminal 3 and attempting to flow to the second electrical detection point 2. At this time, the second diode 7 is in the off state, and the current cannot pass through. Therefore, there is no voltage signal between the second electrical detection point 2 and the first common terminal 3. During period T3, the power supply current reverses again, flowing from the second electrical detection point 2 through the back hall door lock 5 to the second diode 7. At this time, the second diode 7 can conduct, and the current flows through the second diode 7 to the first common terminal 3. Therefore, there is a positive voltage signal between the second electrical detection point 2 and the first common terminal 3. During period T4, the current reverses again, starting from the first common terminal 3 and attempting to flow to the second electrical detection point 2. At this time, the second diode 7 is in the off state, and the current cannot pass through. Therefore, there is no voltage signal between the second electrical detection point 2 and the first common terminal 3.
[0047] However, if a short circuit occurs between the front hall door lock 4 and the rear hall door lock 5, the voltage signal diagram between the first electrical detection point 1 and the first common end 3 is as shown in Figure 4 Specifically, if a short circuit occurs, during the T1 period, when the current is positive, the current cannot flow to the first common end 3 through the first diode 6, but since the second diode 7 is in the on state at this time, and a short circuit occurs between the front hall door lock 4 and the rear hall door lock 5, the current can flow to the rear hall door lock 5 through the short circuit line and then flow to the first common end 3 through the second diode 7. At this time, the voltage detection module 8 can detect that there is a positive voltage signal between the first electrical detection point 1 and the first common end 3, and the T3 period is the same.
[0048] Compared with the related art, the above-mentioned embodiments of the present application can obtain the voltage signal state of the front hall door lock by connecting the first electrical detection point and the first common end through the voltage detection module, obtain the voltage signal state of the rear hall door lock by connecting the second electrical detection point and the first common end through the voltage detection module, and directly determine whether a short circuit occurs between the front hall door lock and the rear hall door lock through the voltage signal state of the front hall door lock and the voltage signal state of the rear hall door lock, so as to timely report the short circuit fault after detecting that a short circuit occurs, thereby improving the safety index of elevator operation.
[0049] Another embodiment of the present application designs a short circuit detection circuit for an elevator car door lock, as shown in Figure 6 The technical concept of the present embodiment is the same as that of the above-mentioned embodiments. The short circuit detection circuit for the elevator car door lock of the present embodiment comprises a third electrical detection point 9, a fourth electrical detection point 10, a second common end 11, a front car door lock 12, a third diode 13, a rear car door lock 14, a fourth diode 15, and a voltage detection module 8.
[0050] The fifth connection end of the front car door lock 12 is connected to the third electrical detection point 9, and the sixth connection end of the front car door lock 12 is connected to the second common end 11 after being connected in series with the third diode 13.
[0051] The seventh connection end of the rear car door lock 14 is connected to the fourth electrical detection point 10, and the eighth connection end of the rear car door lock 14 is connected to the connection line between the third diode and the second common end through the second connection point after being connected in series with the fourth diode; wherein the fourth diode and the third diode are connected in the opposite direction of the on state of the circuit.
[0052] The voltage detection module 8 is connected to the third electrical detection point 9, the fourth electrical detection point 10, and the second common end, respectively, and is used to detect the voltage signal of the front car door lock 12 and the rear car door lock 14.
[0053] In one example, the sixth connecting end of the front door lock 12 is connected to the second common end after being connected in series with the third diode, including: the sixth connecting end of the front door lock 12 is connected to the positive electrode of the third diode, and the negative electrode of the third diode is connected to the second common end.
[0054] Correspondingly, the eighth connecting end of the rear door lock 14 is connected in series with the fourth diode, including: the eighth connecting end of the rear door lock 14 is connected to the negative electrode of the fourth diode, and the positive electrode of the fourth diode is connected to the second connecting point.
[0055] In another example, the sixth connecting end of the front door lock 12 is connected to the second common end after being connected in series with the third diode, including: the sixth connecting end of the front door lock 12 is connected to the negative electrode of the third diode, and the positive electrode of the third diode is connected to the second common end.
[0056] Correspondingly, the eighth connecting end of the rear door lock 14 is connected in series with the fourth diode, including: the eighth connecting end of the rear door lock 14 is connected to the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected to the second connecting point.
[0057] It is not difficult to see that the concept of the embodiment is the same as that of the foregoing embodiment, and the third electrical detection point 9, the fourth electrical detection point 10, and the second common end 11 in the embodiment can correspond to the first electrical detection point 1, the second electrical detection point 2, and the first common end 3 in the foregoing embodiment, respectively; the front door lock 12 and the rear door lock 14 are equivalent replacements of the front hall door lock 4 and the rear hall door lock 5; the third diode 13 and the fourth diode 15 can correspond to the first diode 6 and the second diode 7 in the foregoing embodiment, respectively. On this basis, various details in the foregoing embodiment can be applied to the present embodiment, and there is no difference in application conditions, so the technical details of the present embodiment are described in the foregoing embodiment, and the present application will not be described again. Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present application, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present application.
Claims
1. A short-circuit detection circuit for an elevator hall door lock, characterized in that, include: The system includes a first electrical detection point, a second electrical detection point, a first common terminal, a front hall door lock, a rear hall door lock, a first diode, a second diode, and a voltage detection module. The first connection terminal of the front hall door lock is connected to the first electrical detection point, and the second connection terminal of the front hall door lock is connected to the first diode in series and then connected to the first common terminal. The third connection terminal of the rear hall door lock is connected to the second electrical detection point, and the fourth connection terminal of the rear hall door lock is connected in series with the second diode and then connected to the connection line of the first diode and the first common terminal through the first connection point; wherein, the conduction direction of the second diode and the first diode in the circuit is opposite. The voltage detection module is connected to the first electrical detection point, the second electrical detection point, and the first common terminal, respectively, and is used to detect the voltage signals of the front hall door lock and the rear hall door lock.
2. The elevator hall door lock short-circuit detection circuit according to claim 1, characterized in that, The second connection terminal of the front hall door lock is connected in series with the first diode and then connected to the first common terminal, including: The second connection terminal of the front hall door lock is connected to the positive terminal of the first diode, and the negative terminal of the first diode is connected to the first common terminal.
3. The elevator hall door lock short-circuit detection circuit according to claim 2, characterized in that, The fourth connection terminal of the rear hall door lock is connected in series with the second diode, including: The fourth connection terminal of the rear hall door lock is connected to the negative terminal of the second diode, and the positive terminal of the second diode is connected to the first connection point.
4. The elevator hall door lock short-circuit detection circuit according to claim 1, characterized in that, The second connection terminal of the front hall door lock is connected in series with the first diode and then connected to the first common terminal, including: The second connection terminal of the front hall door lock is connected to the negative terminal of the first diode, and the positive terminal of the first diode is connected to the first common terminal.
5. The elevator hall door lock short-circuit detection circuit according to claim 4, characterized in that, The fourth connection terminal of the rear hall door lock is connected in series with the second diode, including: The fourth connection terminal of the rear hall door lock is connected to the positive terminal of the second diode, and the negative terminal of the second diode is connected to the first connection point.
6. A short-circuit detection circuit for an elevator car door lock, characterized in that, include: The system includes a third electrical detection point, a fourth electrical detection point, a second common terminal, a front door lock, a rear door lock, a third diode, a fourth diode, and a voltage detection module. The fifth connection terminal of the front car door lock is connected to the third electrical detection point, and the sixth connection terminal of the front car door lock is connected in series with the third diode and then connected to the second common terminal; The seventh connection terminal of the rear door lock is connected to the fourth electrical detection point, and the eighth connection terminal of the rear door lock is connected in series with the fourth diode and then connected to the connection line of the third diode and the second common terminal through the second connection point; wherein, the conduction direction of the fourth diode and the third diode in the circuit is opposite. The voltage detection module is connected to the third electrical detection point, the fourth electrical detection point, and the second common terminal, respectively, and is used to detect the voltage signals of the front car door lock and the rear car door lock.
7. The elevator car door lock short-circuit detection circuit according to claim 6, characterized in that, The sixth connection terminal of the front car door lock is connected in series with the third diode and then connected to the second common terminal, including: The sixth connection terminal of the front car door lock is connected to the positive terminal of the third diode, and the negative terminal of the third diode is connected to the second common terminal.
8. The elevator car door lock short-circuit detection circuit according to claim 7, characterized in that, The eighth connection terminal of the rear car door lock is connected in series with the fourth diode, including: The eighth connection terminal of the rear door lock is connected to the negative terminal of the fourth diode, and the positive terminal of the fourth diode is connected to the second connection point.
9. The elevator car door lock short-circuit detection circuit according to claim 6, characterized in that, The sixth connection terminal of the front car door lock is connected in series with the third diode and then connected to the second common terminal, including: The sixth connection terminal of the front car door lock is connected to the negative terminal of the third diode, and the positive terminal of the third diode is connected to the second common terminal.
10. The elevator car door lock short-circuit detection circuit according to claim 9, characterized in that, The eighth connection terminal of the rear car door lock is connected in series with the fourth diode, including: The eighth connection terminal of the rear door lock is connected to the positive terminal of the fourth diode, and the negative terminal of the fourth diode is connected to the second connection point.