STO device for detecting operation contactor and elevator

Abstract

The utility model discloses an STO device used for detecting a running contactor and an elevator, the running contactor and the STO device form a power supply circuit, the running contactor connects or disconnects the power supply circuit according to a control instruction of a mainboard, and the STO device comprises a running contactor detection module. And the operation contactor detection module outputs a feedback signal to the mainboard according to the power supply signal and the self-checking signal, so that the mainboard detects the state of the operation contactor according to the feedback signal. According to the technical scheme, the state of the operation contactor can be monitored in real time, whether adhesion of the contactor occurs or not can be detected in time, so that false suction and abnormal operation of the elevator caused by adhesion of contacts are avoided, the safety of the elevator is remarkably improved, meanwhile, the overall system cost is reduced by reducing high-cost safety relays, and the safety of the elevator is improved. And the elevator is more suitable for large-scale application.

Description

Technical Field

[0001] This utility model relates to the field of elevator technology, and in particular to an STO device for detecting the operation contactor and an elevator. Background Technology

[0002] Elevators are classified as special safety equipment, and their safe and reliable operation is crucial to the safety of users' lives and property. Traditional elevator control systems typically use a contactor control cabinet to control the elevator's start and stop. This control method is characterized by power supply from the end of a high-voltage safety circuit, with the contactor coil's on / off state controlled by relays on the main board. The contactor's main contacts are used to control the elevator's running and braking states. However, this traditional control method has the following problems in practical applications:

[0003] 1. Frequent contactor operation causes noise problems: During elevator operation, the frequent operation of the contactor generates mechanical noise, especially in machine-room-less elevators and home elevators. This noise negatively impacts the riding experience. Furthermore, this noise is difficult to completely eliminate using conventional soundproofing measures, becoming a major concern for users.

[0004] 2. Contact arcing leading to component failure: Frequent arcing of contactor contacts and main board relay contacts accelerates the aging of contactors and relays, reducing their service life. This phenomenon not only increases maintenance costs but may also affect the stability and safety of elevator operation.

[0005] To address the aforementioned issues, STO (Safe Torque Off) devices are being introduced into elevator control systems to replace traditional contactor control schemes. STO devices can electronically control the elevator's start and stop, thereby reducing the frequency of mechanical component movements and lowering noise and contact arcing. However, the application of STO devices faces the following technical challenges:

[0006] Elevator operation, braking, and star-delta switching have complex timing requirements under different states. If the control timing of the STO device does not match the elevator's operating logic, it may lead to braking failure or abnormal operation. When the main board does not issue an operation command, if the operating contactor controlling the STO device accidentally engages due to contact sticking, it will cause abnormal elevator operation and pose a safety hazard.

[0007] To address the issue of relay contact sticking, existing solutions employ a set of safety relays with contact sticking detection capabilities. However, while this solution can detect sticking, it is costly and not conducive to large-scale elevator applications. Furthermore, it does not specifically address the sticking problem of the mainboard's running contactor. When contact sticking occurs, it can cause the running contactor to engage erroneously, leading to abnormal elevator operation and posing a significant safety risk. Utility Model Content

[0008] This utility model provides an STO device for detecting the operation contactor and an elevator to solve the above-mentioned technical problems.

[0009] A first aspect of this utility model provides a STO (Stable Transmission) device for detecting a running contactor, wherein the running contactor and the STO device form a power supply circuit, and the running contactor turns the power supply circuit on or off according to control commands from a motherboard. The STO device includes:

[0010] The operating contactor detection module has a first signal input terminal that receives a power signal when the power supply circuit is turned on, a second signal input terminal that receives a self-test signal, and an output terminal that is connected to the main board to output a feedback signal to the main board based on the power signal and the self-test signal, so that the main board can detect the status of the operating contactor based on the feedback signal.

[0011] Optionally, the operating contactor detection module includes:

[0012] An isolation module, whose first input terminal is the first signal input terminal of the running contactor detection module, and whose second input terminal is the second signal input terminal of the running contactor detection module, to be turned on or off according to the power signal and the self-test signal;

[0013] The signal output module has a first input terminal that receives a first voltage, a first output terminal that is connected to the third input terminal of the isolation module, and a second output terminal that is the output terminal of the running contactor detection module, so as to output an invalid feedback signal or a valid feedback signal according to the on / off state of the isolation module.

[0014] Optionally, the isolation module includes:

[0015] The first isolation unit has a first input terminal that is the second input terminal of the isolation module. Its second input terminal receives a first voltage to turn on or off according to the level of the self-test signal.

[0016] The second isolation unit has a first input terminal that is the first input terminal of the isolation module, a second input terminal that is the third input terminal of the isolation module, and a first output terminal that is connected to the third input terminal of the first isolation unit, so as to turn on or off according to the power signal and the on / off state of the first isolation unit.

[0017] Optionally, the first isolation unit includes:

[0018] The first current limiting module has its first terminal being the first input terminal of the first isolation unit;

[0019] The first optocoupler module has a first end that is the second input terminal of the first isolation unit, a second end that is connected to the second end of the first current limiting module, and a third end that is the third input terminal of the first isolation unit, so as to turn on or off according to the level state of the self-test signal.

[0020] Optionally, the second isolation unit includes:

[0021] The second current limiting module has its first terminal being the first output terminal of the second isolation unit;

[0022] The second optocoupler module has a first terminal that is the first input terminal of the second isolation unit, a second terminal that is connected to the second terminal of the second current limiting module, and a third terminal that is the third input terminal of the second isolation unit, so as to turn on or off according to the on / off state of the first isolation unit and the state of the power signal.

[0023] Optionally, the signal output module includes:

[0024] The third current limiting module has a first terminal that is the first input terminal of the signal output module, a second terminal that is the first output terminal of the signal output module, and a third terminal that is the second output terminal of the signal output module, so as to output current from the first output terminal when the isolation module is turned on, and to output current from the second output terminal when the isolation module is turned off.

[0025] A first energy storage device has a first terminal connected to the third terminal of the third current limiting module and a second terminal grounded, for discharging when the isolation module is turned on and charging when the isolation module is turned off.

[0026] Optionally, the STO device further includes:

[0027] A low-voltage power supply module is connected between the operating contactor and the operating contactor detection module to convert the power signal into a voltage and output a first power signal and a second power signal.

[0028] Optionally, the power signal includes a first power signal and a second power signal, and the operating contactor detection module includes:

[0029] The first STO detection unit receives a first power signal at its first input terminal and a self-test signal at its second input terminal, and outputs a first feedback signal based on the first power signal and the self-test signal.

[0030] The second STO detection unit receives a second power signal at its first input terminal and a self-test signal at its second input terminal, and outputs a second feedback signal based on the second power signal and the self-test signal.

[0031] The logic unit has a first input terminal connected to the output terminal of the first STO detection unit, a second input terminal connected to the output terminal of the second STO detection unit, and an output terminal that is the output terminal of the running contactor detection module, so as to output a feedback signal based on the first feedback signal and the second feedback signal.

[0032] Optionally, the first output terminal of the first STO detection unit is connected to the first input terminal of the control module, the second output terminal of the second STO detection unit is connected to the second input terminal of the control module, and the output terminal of the control module is connected to the second signal input terminal of the running contactor detection module.

[0033] The control module outputs a self-test signal to the running contactor detection module, and detects the status of the running contactor based on the first feedback signal and the second feedback signal.

[0034] A second aspect of this utility model provides an elevator, which includes the STO device, main board, and running contactor described in the first aspect.

[0035] The technical advantages of this utility model embodiment are as follows: By setting a running contactor detection module in the STO device, and comprehensively analyzing the power supply signal and self-test signal of the running contactor through the running contactor detection module, the main board can detect the contact adhesion status in real time, effectively solving the problems of high cost and insufficient adhesion detection in existing solutions. This technical solution can monitor the status of the running contactor in real time and detect whether the contactor has stuck, thereby avoiding elevator mis-engagement and abnormal operation caused by contact adhesion, significantly improving elevator safety. At the same time, this technical solution reduces the overall system cost by reducing the number of high-cost safety relays, making the elevator more suitable for large-scale applications. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a first structural schematic diagram of an STO device for detecting a running contactor provided in Embodiment 1 of this utility model;

[0038] Figure 2 This is a schematic diagram of the structure of a running contactor detection module in an STO device for detecting running contactors, provided in Embodiment 1 of this utility model;

[0039] Figure 3 This is a schematic diagram of the structure of an isolation module in an STO device for detecting a running contactor, provided in Embodiment 1 of this utility model;

[0040] Figure 4 This is a schematic diagram of the structure of the first isolation unit in an STO device for detecting a running contactor, provided in Embodiment 1 of this utility model;

[0041] Figure 5 This is a schematic diagram of the structure of the second isolation unit in an STO device for detecting a running contactor, provided in Embodiment 1 of this utility model;

[0042] Figure 6 This is a schematic diagram of the structure of a signal output module in an STO device for detecting a running contactor, provided in Embodiment 1 of this utility model;

[0043] Figure 7 This is a circuit diagram of an STO device for detecting a running contactor provided in Embodiment 1 of this utility model;

[0044] Figure 8 This is a second structural schematic diagram of an STO device for detecting a running contactor provided in Embodiment 1 of this utility model;

[0045] Figure 9 This is a schematic diagram of the structure of a running contactor detection module in an STO device for detecting running contactors, provided in Embodiment 1 of this utility model;

[0046] Figure 10 This is a schematic diagram of the connection between the running contactor detection module and the control module in an STO device for detecting running contactors, provided in Embodiment 1 of this utility model.

[0047] Figure 11 This is a schematic diagram of the structure of the first STO detection unit in the running contactor detection module of an STO device for detecting running contactors provided in Embodiment 1 of this utility model;

[0048] Figure 12This is a circuit diagram of the first STO detection unit in the running contactor detection module of an STO device for detecting running contactors provided in Embodiment 1 of this utility model;

[0049] Figure 13 This is a schematic diagram of the structure of the second STO detection unit in the running contactor detection module of an STO device for detecting running contactors provided in Embodiment 1 of this utility model;

[0050] Figure 14 This is a circuit diagram of the second STO detection unit in the running contactor detection module of an STO device for detecting running contactors provided in Embodiment 1 of this utility model.

[0051] Figure 15 This is a circuit diagram of the logic unit in the running contactor detection module of an STO device for detecting running contactors, provided in Embodiment 1 of this utility model.

[0052] Figure 16 This is a structural schematic diagram of an elevator provided in Embodiment 2 of this utility model;

[0053] In the diagram: 101, Mainboard; 102, Running Contactor; 103, Running Contactor Detection Module; 104, STO Device; 105, Low-Voltage Power Supply Module; 106, Control Module; 111, Isolation Module; 112, Signal Output Module; 113, First Isolation Unit; 114, Second Isolation Unit; 115, First Optocoupler Module; 116, Second Current Limiting Module; 117, Second Optocoupler Module; 118, Third Current Limiting Module; 119, First Energy Storage Device; 120, First Current Limiting Module; 131, First STO Detection Unit; 132, Second STO Detection Unit; 133, Logic Unit; 141, First Isolation Module; 142, Second Isolation Module; 143, First Signal Output Module; 144, Third Isolation Module; 145, Fourth Isolation Module; 146, Second Signal Output Module. Detailed Implementation

[0054] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0055] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions of layers and regions, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0056] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this utility model, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0057] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0058] Example 1

[0059] This embodiment provides an STO device 104 for detecting the operation of contactor 102, such as... Figure 1 As shown, the operating contactor 102 and the STO device 104 form a power supply circuit. The operating contactor 102 turns the power supply circuit on or off according to the control command of the main board 101. The STO device 104 includes:

[0060] The contactor detection module 103 operates with its first signal input terminal D1 connected to the power signal input terminal D0 of the STO device 104 to receive the power signal V1, its second signal input terminal D2 receiving the self-test signal S1, and its output terminal D3 connected to the main board 101 to output a feedback signal STO_FB to the main board 101 based on the power signal V1 and the self-test signal S1, so that the main board 101 can detect the status of the operating contactor 102 based on the feedback signal STO_FB.

[0061] The operating contactor 102 receives control signal S0 from the main board 101. When control signal S0 is an ON signal, the operating contactor 102 provides power signal V1 to the STO device 104 according to the received power signal V0. When control signal S0 is an OFF signal, it stops providing power signal V1 to the STO device 104. The operating contactor 102 plays the role of power on / off control, providing the electrical foundation for subsequent equipment. When the main board 101 sends the ON control signal S0 to the operating contactor 102, the coil of the operating contactor 102 is energized, its contacts close, and it transmits power signal V1 to the STO device 104. If the contacts of the operating contactor 102 stick together, even if the main board 101 does not send the ON control signal S0, the contacts of the operating contactor 102 remain closed and continue to output power signal V1 to the STO device 104. In this case, it will cause an error in the control timing of the STO device 104, which will lead to an abnormality in the STO device 104. In addition to receiving power from the running contactor 102, the STO device 104 also receives running signals or safety commands from the main board 101. It can quickly disconnect the motor drive signal through its internal electronic circuitry to ensure the motor stops outputting torque. One input of the running contactor detection module 103 receives the power signal V1 from the STO device 104, and the other input receives the self-test signal S1. It detects the state of the power signal V1 based on the self-test signal S1 and feeds the detected state back to the main board 101 for monitoring the adhesion status of the running contactor 102. The running contactor detection module 103 outputs a feedback signal by comparing the power signal V1 and the self-test signal S1. The main board 101 then detects whether the contacts of the running contactor 102 are stuck based on the state of the feedback signal STO_FB. The self-test signal S1 can be a low-frequency or fixed-duty-cycle pulse signal (e.g., 1Hz or a specific PWM waveform), or a fixed-level signal. When the power signal V1 is powered on, the self-test signal S1 works synchronously with the power signal V1 through logic circuitry, generating a feedback signal by logically combining the power signal V1 and the self-test signal S1. The feedback signal can be a level signal or a pulse signal, used to indicate the state of the power signal V1. When the power signal V1 is received, the feedback signal maintains a first expected state (e.g., high level or fixed pulse); when the power signal V1 is not received, the feedback signal exhibits a second expected state (e.g., low level or no pulse output). The motherboard 101 sends a control signal S0 to control the engagement or disengagement of the operating contactor 102, receives a feedback signal STO_FB from the operating contactor detection module 103, detects the state of the operating contactor 102, and takes corresponding control measures. According to the elevator operation logic, the main board 101 sends a control signal S0 to the running contactor 102 to control the closing or opening of its contacts, and receives a feedback signal STO_FB from the running contactor detection module 103 to analyze the status of the running contactor 102.If the feedback signal STO_FB indicates that the contacts of the running contactor 102 are stuck, the main board 101 will trigger an alarm or stop the system, such as stopping the drive motor or disconnecting other circuits, to prevent abnormal elevator operation.

[0062] The technical advantage of the solution provided in this embodiment is that by setting a running contactor detection module in the STO device, and comprehensively analyzing the power supply signal and self-test signal of the running contactor, the main board can detect the contact adhesion status in real time, effectively solving the problems of high cost and insufficient adhesion detection in existing solutions. This technical solution can monitor the status of the running contactor in real time and detect whether the contactor has stuck, thereby avoiding elevator mis-engagement and abnormal operation caused by contact adhesion, significantly improving elevator safety. At the same time, this technical solution reduces the overall system cost by reducing the number of high-cost safety relays, making the elevator more suitable for large-scale applications.

[0063] As one implementation method, such as Figure 2 As shown, the contactor detection module 103 includes:

[0064] The isolation module 111 has a first input terminal D1 that is the first signal input terminal D1 of the running contactor detection module 103, and a second input terminal D2 that is the second signal input terminal D2 of the running contactor detection module 103, so as to turn on or off according to the power signal V1 and the self-test signal S1.

[0065] The signal output module 112 has a first input terminal D6 that receives a first voltage U1, a first output terminal D5 that is connected to the third input terminal D4 of the isolation module 111, and a second output terminal D3 that is the output terminal D3 of the running contactor detection module 103, so as to output an invalid feedback signal or an effective feedback signal according to the on / off state of the isolation module 111.

[0066] The isolation module 111 receives a power signal V1 and a self-test signal S1. Based on the states of V1 and S1, it performs logical combinations to control the on / off state, achieving circuit signal isolation and preventing the high-voltage power signal from directly affecting subsequent signal output modules, thus ensuring circuit safety and signal integrity. The signal output module 112 detects the on / off state of the isolation module 132 and outputs a feedback signal STO_FB based on the on / off state of the isolation module 111. When the isolation module 111 is on, it outputs an invalid feedback signal; when it is off, it outputs a valid feedback signal. An invalid feedback signal indicates that a power signal is received and the isolation module is on; a valid feedback signal indicates that a power signal is received and the isolation module is off.

[0067] The technical advantages of this implementation are as follows: the isolation module protects the subsequent circuits, preventing high voltage or abnormal signals from directly affecting the signal output module; the logical combination of self-test signals and power signals enables comprehensive monitoring of the power signals, which helps to promptly detect and resolve the sticking problem of the operating contactor.

[0068] As one implementation of the isolation module 111, such as Figure 3 As shown, the isolation module 111 includes:

[0069] The first isolation unit 113 has a first input terminal D2 which is the second input terminal D2 of the isolation module 111, and its second input terminal D7 receives the first voltage U1 to turn on or off according to the level of the self-test signal S1.

[0070] The second isolation unit has a first input terminal D1 that is the first input terminal D1 of the isolation module 111, a second input terminal D4 that is the third input terminal D4 of the isolation module 111, and a first output terminal D8 that is connected to the third input terminal D9 of the first isolation unit 113, so as to turn on or off according to the power signal V1 and the on / off state of the first isolation unit 113.

[0071] The first isolation unit 113 receives a self-test signal S1 and a first voltage U1, and turns itself on or off based on the level of the self-test signal S1; it turns off when the self-test signal S1 is high and on when the self-test signal S1 is low. The second isolation unit 114 receives a power supply signal V1 and determines its own on or off state by monitoring the power supply signal V1 and the on / off state of the first isolation unit 113. When the first isolation unit 113 is on, the second isolation unit 114 is on; when the first isolation unit 113 is off, the second isolation unit 114 is off.

[0072] The technical advantage of this embodiment is that the isolation module, through the coordinated work of the first isolation unit and the second isolation unit, achieves real-time monitoring and accurate feedback of the power signal status, which not only ensures the safety of the system, but also improves the reliability and accuracy of the monitoring.

[0073] As one implementation of the first isolation unit 113, such as Figure 4 As shown, the first isolation unit 113 includes:

[0074] The first current limiting module 120 has its first terminal D2 as the first input terminal D2 of the first isolation unit 113;

[0075] The first optocoupler module 115 has a first terminal D7 that is the second input terminal D7 of the first isolation unit 115, a second terminal D11 that is connected to the second terminal D10 of the first current limiting module 120, and a third terminal D9 that is the third input terminal D9 of the first isolation unit 113, so as to turn on or off according to the level state of the self-test signal S1.

[0076] In this module, the first current limiting module 120 receives a self-test signal S1 at its first terminal D2, providing a power path for the first optocoupler module 115 to limit current. Based on the level of the self-test signal S1 (valid or invalid), it determines whether current is allowed to flow to the first optocoupler module 115. The first optocoupler module 115 controls the conduction or deactivation of its internal optocoupler according to the level of the self-test signal S1. When the self-test signal S1 is valid (e.g., low level), the first optocoupler module 115 conducts, outputting a corresponding signal after photoelectric conversion; when the self-test signal S1 is invalid (e.g., high level), the first optocoupler module 115 deactivates and does not output a signal.

[0077] The technical advantages of this embodiment are: achieving electrical isolation between the self-test signal and subsequent circuits, avoiding interference or safety issues caused by electrical coupling, ensuring that the output signal is consistent with the self-test signal, and providing reliable status feedback for subsequent circuits.

[0078] As one implementation of the second isolation unit 114, such as Figure 5 As shown, the second isolation unit 114 includes:

[0079] The first terminal D8 of the second current limiting module 116 is the first output terminal D8 of the second isolation unit 114;

[0080] The second optocoupler module 117 has a first terminal D1 that is the first input terminal D1 of the second isolation unit 114, a second terminal D13 that is connected to the second terminal D12 of the second current limiting module 116, and a third terminal D4 that is the third input terminal D4 of the second isolation unit 114, so as to turn on or off according to the on / off state of the first isolation unit 113 and the state of the power signal.

[0081] The second current limiting module 116 controls the current flowing to the second optocoupler module 117. Based on the on / off state of the first isolation unit 113, it controls the current flow, ensuring that the second optocoupler module 117 is turned on or off when needed. The second optocoupler module 117 receives a power signal and controls the on / off state of its internal optocoupler based on the on / off state of the first isolation unit 113 and the power signal. When the first isolation unit 113 is on and the power signal is valid, the second optocoupler module 117 is on, transmitting the signal to subsequent circuits; when the first isolation unit 113 is off or the power signal is invalid, the second optocoupler module 117 is off, and no signal is transmitted.

[0082] The technical advantages of this embodiment are: providing electrical isolation to prevent signal interference or high voltage from affecting the circuit, protecting subsequent circuits, precisely controlling signal transmission, ensuring signal transmission and logic consistency in the circuit, and providing clear and accurate signal feedback for subsequent circuits.

[0083] As one implementation of the signal output module 112, such as Figure 6 As shown, the signal output module 112 includes:

[0084] The third current limiting module has a first terminal D6 that is the first input terminal D6 of the signal output module 112, a second terminal D5 that is the first output terminal D5 of the signal output module 112, and a third terminal D14 that is the second output terminal D3 of the signal output module 112, so as to output current from the first output terminal D5 when the isolation module 111 is turned on, and to output current from the second output terminal D14 when the isolation module 111 is turned off.

[0085] The first energy storage device 119 has its first terminal D15 connected to the third terminal D14 of the third current limiting module 118 to discharge when the isolation module 111 is turned on and to charge when the isolation module 111 is turned off.

[0086] The third current limiting module 118 receives the first voltage and forms a path with the isolation module 111 when the isolation module 111 is on, and outputs current to the first energy storage device 119 and subsequent circuits when the isolation module 111 is off. The current output path is controlled according to the on / off state of the isolation module 111: when the isolation module 111 is on, current is output from the first output terminal; when the isolation module 111 is off, current is output from the second output terminal. When the isolation module 111 is on, the first energy storage device 119 discharges, its voltage is pulled low, and the signal output module 112 outputs a low level. When the isolation module 111 is off, the first energy storage device 119 charges, storing electrical energy, and the signal output module 112 outputs a high level.

[0087] The technical effect of this embodiment is that, through the coordinated work of the third current limiting module and the first energy storage device, dynamic sensing of the isolation module status and precise control of current output are realized. The third current limiting module controls the switching of the current path, and the first energy storage device charges and discharges in different states of the isolation module, outputting high-level signals or low-level signals, thereby realizing the functions of dynamic signal response, stable output and short-term storage.

[0088] As an optional circuit structure, such as Figure 7As shown, the first current limiting module 114 includes a twenty-second resistor R22, and the first optocoupler module 115 includes a twenty-third resistor R23 and a fifth optocoupler device Q5. The first end of the twenty-second resistor R22 is the first end of the first current limiting module 114. The other end of the twenty-second resistor R22 is connected to one end of the twenty-third resistor R3 and the cathode of the light-emitting diode of the fifth optocoupler device Q5. The other end of the twenty-third resistor R23 and the anode of the light-emitting diode of the fifth optocoupler device Q5 are connected together to form the first end of the first optocoupler module 115. The collector of the transistor of the fifth optocoupler device Q5 is the third end of the first optocoupler module 115.

[0089] The second current limiting module 116 includes a twenty-fourth resistor R24, one end of which is the first terminal of the second current limiting module 116. The second optocoupler module 117 includes a twenty-first resistor R21, a third Zener diode D3, and a sixth optocoupler device Q6. One end of the twenty-first resistor R21 and the anode of the light-emitting diode of the sixth optocoupler device Q6 are connected together to form the first terminal of the second optocoupler module 117. The other end of the twenty-first resistor R21 and the anode of the first Zener diode D1 are connected together to form the second terminal of the second optocoupler module 117. The cathode of the first Zener diode D1 is connected to the cathode of the light-emitting diode of the sixth optocoupler device Q6. The collector of the transistor of the sixth optocoupler device Q6 is the third terminal of the second optocoupler module 117. The emitter of the transistor of the sixth optocoupler device Q6 is grounded.

[0090] The signal output module 112 includes a third current limiting module 118 and a first energy storage device 119. The third current limiting module 118 includes a twenty-fifth resistor R25 and a twenty-sixth resistor R26. The first energy storage device 119 is a twenty-first capacitor C21. One end of the twenty-fifth resistor R25 is the first end of the third current limiting module 118. The other end of the twenty-fifth resistor R25 and one end of the twenty-sixth resistor R26 are connected together to form the second end of the third current limiting module 118. The other end of the twenty-sixth resistor R26 and the first end of the twenty-first capacitor C21 are connected together to form the output end of the third current limiting module 118. The second end of the twenty-first capacitor C21 is grounded.

[0091] When the self-test signal S1 is high, the LED of the fifth optocoupler Q5 is off; when the self-test signal S1 is low, the LED of the fifth optocoupler Q5 is on and illuminates. The twenty-fourth resistor R24 ​​forms a current path with the transistor of the fifth optocoupler Q5 and, in conjunction with the third Zener diode D3, limits the current through the transistor, protecting the transistor. The twenty-fifth resistor R25 forms a current path with the collector of the transistor of the sixth optocoupler Q6, ensuring that the transistor of the sixth optocoupler Q6 operates within an appropriate current range. The twenty-sixth resistor R26, in conjunction with the twenty-first capacitor C21, is used for filtering the output signal, reducing spike interference. The sixth optocoupler Q6 detects the state of the power supply signal V1, achieving electrical isolation between the input and output signals through optocoupler. The fifth optocoupler Q5 detects the state of the self-test signal S1 and achieves isolation through optocoupler. When power signal V1 and self-test signal S1 are received, and both power signal V1 and self-test signal S1 are high, the fifth optocoupler Q5 and the sixth optocoupler Q6 are both off, and the feedback signal STO_FB output by signal output module 112 is high. When power signal V1 is high and self-test signal S1 is low, the fifth optocoupler Q5 and the sixth optocoupler Q6 are both on, and the feedback signal STO_FB output by signal output module 112 is low. The feedback signal STO_FB output by signal output module 112 has the same frequency and pulse width as the self-test signal S1. When the main board 101 controls the running contactor 102 to open, the main board 101 detects that the feedback signal STO_FB has the same frequency and pulse width as the self-test signal S1, and determines that the running contactor 102 is stuck.

[0092] As one implementation method, such as Figure 8 and Figure 9 As shown, the STO device 104 further includes: a low-voltage power supply module 105, located between the operating contactor 102 and the operating contactor detection module 103. The low-voltage power supply module 105 outputs a first power signal V2 and a second power signal V3. The operating contactor detection module 103 includes:

[0093] The first STO detection unit 131 has a first input terminal A1 receiving a first power signal V2 and a second input terminal A2 receiving a self-test signal S1, so as to output a first feedback signal STO_FB1 according to the first power signal V2 and the self-test signal S1.

[0094] The second STO detection unit 132 has a first input terminal A3 that receives a second power signal V3 and a second input terminal A4 that receives a self-test signal S1, so as to output a second feedback signal STO_FB2 according to the second power signal V3 and the self-test signal S1.

[0095] The logic unit 133 has its first input terminal A5 connected to the output terminal B1 of the first STO detection unit 131, its second input terminal A6 connected to the output terminal B2 of the second STO detection unit 132, and its output terminal B3 being the output terminal of the running contactor detection module 103, so as to output the feedback signal STO_FB according to the first feedback signal STO_FB1 and the second feedback signal STO_FB2.

[0096] The first STO detection unit 131 receives a first power signal V2 and a self-test signal S1 to monitor the state of the first power signal V2, and generates a first feedback signal STO_FB1 based on the first power signal V2 and the self-test signal S1. The first feedback signal STO_FB1 indicates the level state of the first power signal V2. When the first power signal V2 is at a high level, the first feedback signal STO_FB1 is at a high level or a pulse signal; when the first power signal V2 is at a low level, the first feedback signal STO_FB1 is at a low level or 0. The second STO detection unit 132 receives a second power signal V3 and a self-test signal S1 to monitor the state of the second power signal V3, and generates a second feedback signal STO_FB2 based on the second power signal V3 and the self-test signal S1. The second feedback signal STO_FB2 indicates the level state of the second power signal V3. When the second power signal V3 is high, the second feedback signal STO_FB2 is high or a pulse signal; when the second power signal V3 is low, the second feedback signal STO_FB2 is low or 0. The logic unit 133 receives the first feedback signal STO_FB1 and the second feedback signal STO_FB2, and generates the final feedback signal STO_FB through logic operations (such as AND gates, OR gates, etc.) to indicate the overall power signal status. For example, if the logic unit 133 uses an AND gate, when the motherboard 101 controls the running contactor 102 to disconnect, if both the first feedback signal STO_FB1 and the second feedback signal STO_FB2 are high, the output feedback signal STO_FB is high, and the motherboard 101 determines that the running contactor 102 is stuck.

[0097] The technical advantage of this embodiment is that, through the coordinated work of the first STO detection unit, the second STO detection unit, and the logic unit, the STO detection module can independently and comprehensively monitor multiple power signals in real time, and provide feedback to the motherboard on the power status output by the running contactor, thereby improving the safety and reliability of the system.

[0098] As one implementation method, such as Figure 10As shown, the output terminal B1 of the first STO detection unit 131 is connected to the first input terminal A8 of the control module 106, the output terminal B2 of the second STO detection unit 132 is connected to the second input terminal A7 of the control module 106, and the output terminal B4 of the control module 106 is connected to the second signal input terminal of the running contactor detection module 103. The control module 106 outputs a self-test signal S1 to the running contactor detection module 103 and detects the status of the running contactor 102 according to the first feedback signal STO_FB1 and the second feedback signal STO_FB2.

[0099] The control module 106 receives a first feedback signal STO_FB1 and a second feedback signal STO_FB2, performs logical analysis on the two feedback signals, and detects whether the operating contactor 102 has experienced contact sticking. The control module 106 compares and analyzes the first feedback signal STO_FB1 and the second feedback signal STO_FB2 to determine whether they conform to the control signal logic sent by the main board 101. When the operating contactor 102 is in a normal conducting state, both feedback signals conform to expectations (e.g., high level or normal pulse). When the operating contactor 102 is in a normal off state, both feedback signals conform to expectations (e.g., low level, no pulse). When the operating contactor 102 is stuck, neither feedback signal conforms to expectations. If the operating contactor 102 is stuck, the control module 106 determines that the operating contactor 102 is stuck or there is a signal fault based on the feedback signal status, and triggers protection logic, such as stopping the motor, triggering an alarm, or cutting off the power supply.

[0100] The technical advantage of this implementation is that, through the two output signals (first feedback signal and second feedback signal) of the STO detection module, the control module can accurately monitor the status of the operating contactor. This design enhances the safety, reliability and fault diagnosis capability of the system, and is an effective solution for monitoring the operating contactor.

[0101] As an optional implementation, when the contactor detection module 103 receives the second power signal V2 and the third power signal V3, the frequency and pulse width of the first feedback signal STO_FB1, the second feedback signal STO_FB2, and the feedback signal STO_FB are all the same as those of the self-test signal S1.

[0102] If the second power signal V2 and the third power signal V3 are received normally, the waveform characteristics (frequency and pulse width) of the feedback signal will be consistent with the self-test signal S1. The self-test signal S1 serves as a reference signal, providing a comparison for the feedback signal. By maintaining consistency, the motherboard 101 or the control module 106 can determine whether the system is operating normally by detecting whether the feedback signal matches the self-test signal.

[0103] As an optional implementation method, such as Figure 11 As shown, the first STO detection unit 131 includes:

[0104] The first isolation module 141 has a first terminal A11 that receives the third power supply V4, a second terminal A12 that receives the self-test signal S1, and a third terminal B12 that is grounded, so as to turn on or off according to the self-test signal S1.

[0105] The second isolation module 142 has a first terminal A13 that receives the first power signal V2, a second terminal A14 that is connected to the fourth terminal B11 of the first isolation module 141, and a third terminal B14 that is grounded, so as to turn on or off according to the on / off state of the first power signal V2 and the first isolation module 141.

[0106] The first signal output module 143 has its first terminal A15 connected to the third power supply V4, its second terminal A16 connected to the fourth terminal B13 of the second isolation module 142, and its third terminal B18 grounded. It is used to output the first feedback signal STO_FB1 according to the on / off state of the second isolation module 142.

[0107] The first isolation module 141 receives a self-test signal S1 and provides electrical isolation. Based on the state of the self-test signal S1 (high or low), it controls its internal on / off state. Terminal A11 receives the operating voltage from the third power supply V4. Terminal A12 receives the self-test signal S1 and controls whether the module is allowed to conduct. Terminal B12 is grounded to provide a reference potential. When the self-test signal S1 is high, the first isolation module 141 conducts, allowing the signal to pass. When the self-test signal S1 is low, the first isolation module 141 is off, cutting off the signal path. The second isolation module 142 receives the first power supply signal V2 and determines its own on / off state based on the on / off state of the first isolation module 141. Terminal B14 is connected to the fourth terminal of the first isolation module 141 to obtain its on / off state. Terminal B14 is grounded to provide a reference potential for the circuit. If the first power supply signal V2 is normal (high) and the first isolation module is on, the second isolation module 142 conducts. If the first power supply signal V2 is normal (high level) and the first isolation module is off, the second isolation module 142 remains off. The first signal output module 143 generates a first feedback signal STO_FB1 based on the on / off state of the second isolation module 142. The first feedback signal STO_FB1 directly reflects the state of the first power supply signal V2 and the self-test signal S1. When the second isolation module 142 is on, the third power supply flows to ground through the second isolation module, and the first signal output module 143 outputs a low-level first feedback signal STO_FB1. When the second isolation module is off, the first signal output module 143 outputs a high-level first feedback signal STO_FB1.

[0108] The technical advantages of this implementation are as follows: the first STO detection unit, through the coordinated operation of the first isolation module, the second isolation module, and the signal output module, achieves isolated detection of the first power signal and the self-test signal, and outputs the overall status through the first feedback signal, thereby improving the system's safety, reliability, and maintainability. This design effectively enhances the system's anti-interference capability and fault response speed, providing an important guarantee for the safe operation of the overall system.

[0109] As an optional circuit structure, such as Figure 12 As shown, the first isolation module 141 includes a second resistor R2, a third resistor R3, a fourth resistor R4, and a first optocoupler Q1. The first end of the second resistor R2 is the second end of the first isolation module 141. The other end of the second resistor R2 is connected to one end of the third resistor R3 and the cathode of the light-emitting diode of the first optocoupler Q1. The other end of the third resistor R3 and the anode of the light-emitting diode of the first optocoupler Q1 are connected together to form the first end of the first isolation module 141. The collector of the transistor of the first optocoupler Q1 is connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is the fourth end of the first isolation module 141. The emitter of the transistor of the first optocoupler Q1 is the third end of the first isolation module 141.

[0110] The second isolation module 142 includes a first resistor R1, a second Zener diode D1, and a second optocoupler Q2. One end of the first resistor R1 and the anode of the light-emitting diode of the second optocoupler Q2 are connected together to form the first terminal of the second isolation module 142. The other end of the first resistor R1 and the anode of the first Zener diode D1 are connected together to form the second terminal of the second isolation module 142. The cathode of the first Zener diode D1 is connected to the cathode of the light-emitting diode of the second optocoupler Q2. The collector of the transistor of the second optocoupler Q2 is the fourth terminal of the second isolation module 142. The emitter of the transistor of the second optocoupler Q2 is the third terminal of the second isolation module 142.

[0111] The first signal output module 143 includes a fifth resistor R5, a sixth resistor R6, and a first capacitor C1. One end of the fifth resistor R5 is the first terminal of the first signal output module 143. The other end of the fifth resistor R5 and one end of the sixth resistor R6 are connected together to form the second terminal of the first signal output module 143. The other end of the sixth resistor R6 and the first end of the first capacitor C1 are connected together to form the output terminal of the first signal output module 143. The second end of the first capacitor C1 is the third terminal of the first signal output module 143.

[0112] In this design, the first resistor R1 provides current shunt to the LED of the first optocoupler Q1, protecting its LED. The second resistor R2 limits the current to one end of the LED of the second optocoupler Q2. The third resistor R3 provides current shunt to the LED of the second optocoupler Q2, protecting its LED. When the self-test signal S1 is high, the LED of the second optocoupler Q2 is off; when the self-test signal S1 is low, the LED of the second optocoupler Q2 is on and emits light. The fourth resistor R4 forms a current path with the transistor of the second optocoupler Q2 and, in conjunction with the first Zener diode D1, limits the current through the transistor, protecting it. The fifth resistor R5 forms a current path with the collector of the transistor of the first optocoupler Q1, ensuring that the transistor operates within an appropriate current range. The sixth resistor R6, in conjunction with the first capacitor C1, is used for filtering the output signal, reducing spike interference. The first optocoupler Q1 detects the state of the first power signal and achieves electrical isolation between the input and output signals through optocoupler. The second optocoupler Q2 detects the state of the self-test signal and achieves isolation through optocoupler. When the first power signal and the self-test signal are received, and both the first power signal and the self-test signal are at a high level, both the first optocoupler Q1 and the second optocoupler Q2 are in the off state, and the feedback signal output by the first STO detection unit 131 is at a high level. When the first power signal V2 is at a high level and the self-test signal S1 is at a low level, both the first optocoupler Q1 and the second optocoupler Q2 are in the on state, and the feedback signal STO_FB1 output by the first STO detection unit 131 is at a low level. The feedback signal STO_FB1 output by the first STO detection unit 131 has the same frequency and pulse width as the self-test signal S1.

[0113] The technical advantages of this embodiment are as follows: The first STO detection unit achieves independent detection and signal isolation of the first power supply signal and the self-test signal through resistor current limiting, optocoupler isolation, Zener diode protection, and capacitor filtering, and outputs a stable and reliable feedback signal. This circuit has good anti-interference capability and fault protection capability, ensuring the accuracy of signal transmission and the reliability of the system, and providing a stable input state for subsequent logic circuits.

[0114] As an optional implementation method, such as Figure 13 As shown, the second STO detection unit 132 includes:

[0115] The third isolation module 144 has a first terminal A21 that receives the third power supply V4, a second terminal A22 that receives the self-test signal S1, and a third terminal B22 that is grounded, so as to turn on or off according to the self-test signal S1.

[0116] The fourth isolation module 145 has a first terminal A23 that receives the second power signal, a second terminal A24 that is connected to the fourth terminal B21 of the third isolation module 144, and a third terminal B24 that is grounded, so as to turn on or off according to the second power signal V3 and the on / off state of the third isolation module 144.

[0117] The second signal output module 146 has its first terminal A25 connected to the third power supply V4, its second terminal A26 connected to the fourth terminal B23 of the fourth isolation module 145, and its third terminal B28 grounded. It is used to output the second feedback signal STO_FB2 according to the on / off state of the fourth isolation module 145.

[0118] The third isolation module 144 receives the self-test signal S1 and provides electrical isolation. Based on the state of the self-test signal S1 (high or low), it controls its internal on / off state. The first terminal A21 receives the operating voltage from the third power supply V4. The second terminal A22 receives the self-test signal S1 and controls whether the module is allowed to conduct. The third terminal A23 is grounded to provide a reference potential. When the self-test signal S1 is high, the third isolation module 144 conducts, allowing the signal to pass. When the self-test signal S1 is low, the third isolation module 144 is off, cutting off the signal path. The fourth isolation module 145 receives the second power supply signal V3 and determines its own on / off state based on the on / off state of the third isolation module 144. The second terminal A24 is connected to the fourth terminal B21 of the third isolation module 144 to obtain its on / off state. The third terminal B24 is grounded to provide a reference potential for the circuit. If the second power signal V3 is normal (high level) and the third isolation module 144 is on, the fourth isolation module 145 is on. If the second power signal V3 is normal (high level) and the third isolation module 144 is off, the fourth isolation module 145 remains off. The second signal output module 146 generates a second feedback signal STO_FB2 based on the on / off state of the fourth isolation module 145. The second feedback signal STO_FB2 directly reflects the state of the second power signal V3 and the self-test signal S1. When the fourth isolation module 145 is on, the third power supply flows to ground through the fourth isolation module 145, and the second signal output module 146 outputs a low-level second feedback signal STO_FB2. When the fourth isolation module 145 is off, the second signal output module 146 outputs a high-level second feedback signal STO_FB2.

[0119] The technical advantage of this implementation is that the second STO detection unit, through the coordinated operation of the third isolation module, the fourth isolation module, and the second signal output module, achieves isolated detection of the second power signal and the self-test signal, and outputs the overall status through the second feedback signal, thereby improving the system's safety, reliability, and maintainability. This design effectively enhances the system's anti-interference capability and fault response speed, providing an important guarantee for the safe operation of the overall system.

[0120] As one implementation method, such as Figure 14 As shown, the third isolation module 144 includes a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a third optocoupler Q3. The first end of the twelfth resistor R12 is the second end of the third isolation module 144. The other end of the twelfth resistor R12 is connected to one end of the thirteenth resistor R13 and the cathode of the light-emitting diode of the third optocoupler Q3. The other end of the thirteenth resistor R13 and the anode of the light-emitting diode of the third optocoupler Q3 are connected together to form the first end of the third isolation module 144. The collector of the transistor of the third optocoupler Q3 is connected to one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is the fourth end of the third isolation module 144. The emitter of the transistor of the third optocoupler Q3 is the third end of the third isolation module 144.

[0121] The fourth isolation module 145 includes an eleventh resistor R11, a second Zener diode D2, and a fourth optocoupler Q4. One end of the eleventh resistor R11 and the anode of the light-emitting diode of the fourth optocoupler Q4 are connected together to form the first terminal of the fourth isolation module 145. The other end of the eleventh resistor R11 and the anode of the second Zener diode D2 are connected together to form the second terminal of the fourth isolation module 145. The cathode of the second Zener diode D2 is connected to the cathode of the second Zener diode D2. The collector of the transistor of the fourth optocoupler Q4 is the fourth terminal of the fourth isolation module 145, and the emitter of the transistor of the fourth optocoupler Q4 is the third terminal of the fourth isolation module 145.

[0122] The second signal output module 146 includes a fifteenth resistor R15, a sixteenth resistor R16, and a second capacitor C2. One end of the fifteenth resistor R15 is the first end of the second signal output module 146. The other end of the fifteenth resistor R15 and one end of the sixteenth resistor R16 are connected together to form the second end of the second signal output module 146. The other end of the sixteenth resistor R16 and the first end of the second capacitor C2 are connected together to form the output end of the second signal output module 146. The second end of the second capacitor C2 is the third end of the second signal output module 146.

[0123] In this circuit, the eleventh resistor, R11, provides current shunt to the LED of the third optocoupler Q3, protecting it. The twelfth resistor, R12, limits current at one end of the LED of the fourth optocoupler Q4. The thirteenth resistor, R13, provides current shunt to the LED of the fourth optocoupler Q4, protecting it. When the self-test signal S1 is high, the LED of the fourth optocoupler Q4 is off; when the self-test signal S1 is low, the LED of the fourth optocoupler Q4 is on and illuminates. The fourteenth resistor, R14, forms a current path with the transistor of the fourth optocoupler Q4, working in conjunction with the second Zener diode D2 to limit the transistor current and protect it. The fifteenth resistor, R15, forms a current path with the transistor of the third optocoupler Q3, ensuring that the transistor operates within an appropriate current range. The sixteenth resistor, R16, working in conjunction with the second capacitor C2, is used for output signal filtering to reduce spike interference. The third optocoupler Q3 detects the state of the second power signal V3, achieving electrical isolation between the input and output signals through optocoupler. The fourth optocoupler Q4 detects the state of the self-test signal and achieves isolation through optocoupler. When the second power signal V3 and the self-test signal S1 are received, and both the second power signal V3 and the self-test signal S1 are at a high level, both the third optocoupler Q3 and the fourth optocoupler Q4 are in the off state, and the feedback signal STO_FB2 output by the second STO detection unit 132 is at a high level. When the second power signal V3 is at a high level and the self-test signal S1 is at a low level, both the third optocoupler Q3 and the fourth optocoupler Q4 are in the on state, and the feedback signal STO_FB2 output by the second STO detection unit 132 is at a low level. The feedback signal STO_FB2 output by the second STO detection unit 132 has the same frequency and pulse width as the self-test signal S1.

[0124] The technical advantages of this implementation are as follows: the second STO detection unit achieves independent detection and signal isolation of the second power supply signal and the self-test signal through resistor current limiting, optocoupler isolation, Zener diode protection, and capacitor filtering, and outputs a stable and reliable feedback signal. This circuit has excellent anti-interference and fault protection capabilities, ensuring the accuracy of signal transmission and the reliability of the system, providing a stable input state for subsequent logic circuits.

[0125] As one implementation method, such as Figure 15 As shown, logic unit 133 is an AND gate, with the first input terminal of the AND gate being the first input terminal of logic unit 133, the second input terminal of the AND gate being the second input terminal of logic unit 133, and the output terminal of the AND gate being the output terminal of logic unit 133.

[0126] The AND gate receives the first feedback signal STO_FB1 and the second feedback signal STO_FB2 respectively. If both the first feedback signal STO_FB1 and the second feedback signal STO_FB2 are high, the AND gate outputs a high-level feedback signal STO_FB, indicating that the first power signal V2 and the second power signal V3 are being received normally. When the main board 101 does not issue a relay energizing command for the running contactor, a high-level output from the AND gate indicates that the relay for the running contactor is engaged.

[0127] In this logic unit, the AND gate performs a comprehensive judgment on the first and second feedback signals through a logical AND operation. Its efficient logic processing capability ensures the system's security, reliability, and ability to quickly locate faults.

[0128] It should be noted that the logic unit 133 can be an AND gate, an OR gate, a programmable logic device (PLD), a combination device that achieves the same function through other logic gate combinations, a combination device that achieves the same function through discrete components, an operational amplifier logic circuit, a diode logic circuit, etc.

[0129] In combination with the above Figure 12 , Figure 14 And to Figure 15 The control module 106 sends a self-test signal S1, for example, with a frequency of 2kHz and a pulse width of 200µs. The first power supply signal V2 and the second power supply signal V3 are both 24VDC. Based on the states of the power supply signals and the self-test signal, the following two cases apply:

[0130] In the first case: if both detection channels of STO are normal, the first feedback signal STO_FB1 and the second feedback signal STO_FB2 are both signals with the same frequency and pulse width as the self-test signal S1. After the AND logic processing, the output feedback signal STO_FB is also a signal with the same frequency and pulse width as the self-test signal S1.

[0131] The second scenario: When the first power signal V2 and the second power signal V3 are de-energized, for example, when the STO device executes the STO action according to the control command of the motherboard, the first feedback signal STO_FB1 and the second feedback signal STO_FB2 are both at a low level. After the AND logic processing, the output feedback signal STO_FB is 0.

[0132] Specifically, the main board 101 can detect the sticking state of the relay of the running contactor 102 based on the above two situations. When the main board 101 does not issue a relay engagement command for the running contactor 102, before the elevator starts running after the door is closed in the door zone, the relay of the running contactor 102 controlled by the main board 101 should normally be in the open state. If the first feedback signal STO_FB1, the second feedback signal STO_FB2, and the feedback signal STO_FB are all signals with the same frequency and pulse width as the self-test signal, then the main board 101 determines that the relay of the running contactor 102 is stuck. If the first feedback signal STO_FB1, the second feedback signal STO_FB2, and the feedback signal STO_FB are all at a high level, then the main board 101 determines that the relay of the running contactor 102 is normally open. The logic is shown in the table below:

[0133]

[0134] Example 2

[0135] This second embodiment provides an elevator, which includes the STO device, main board, and running contactor provided in the first embodiment.

[0136] like Figure 16 As shown, the elevator also includes a low-voltage power supply module 105, a control module 106, a drive module 151, an inverter module 152, and a motor 153. The low-voltage power supply module 105 is connected between the running contactor 102 and the STO detection module 103. The control module 106 is connected to the STO detection module 103 and outputs a self-test signal to the STO detection module 103. The STO device 104 is also connected to the drive module 151. The drive module 151 is connected to the inverter module 152. The inverter module 152 is connected to the motor 153.

[0137] The operating contactor 102 controls the switching on and off of the power supply circuit, providing power to the low-voltage power module 105. The low-voltage power module 105 receives the power supply signal from the operating contactor 102 and outputs a first power signal V2 and a second power signal V3. The control module 106 generates and sends a self-test signal S1, and simultaneously receives the feedback signal STO_FB from the STO detection module 103 for operational status analysis and fault handling. The control module 106 sends the self-test signal S1 to the STO detection module 104 and receives the feedback signals STO_FB1 and STO_F2 from the STO detection module 103, analyzing the status of the operating contactor 102. The drive module 151 receives the operating command from the STO device 104, drives the inverter module 152 to operate, and controls the operating status of the motor 153 by adjusting the output of the inverter module 152. Inverter module 152 converts the control signals output by drive module 151 into three-phase AC power, providing the necessary power to motor 153. It adjusts the voltage and frequency to meet the requirements of the control signals received from drive module 151. Inverter module 152 generates corresponding three-phase AC power according to instructions, and adjusts the output voltage and frequency to control the speed and direction of motor 153. Motor 153 provides the mechanical power required for elevator operation. Motor 153 receives three-phase AC power from inverter module 152, driving the motor rotor. The speed and direction of the elevator are controlled based on the magnitude and frequency of the output current.

[0138] The technical advantages of this second embodiment are as follows: through the coordinated operation of the low-voltage power supply module, control module, drive module, inverter module, motor, and STO detection module, the entire elevator system achieves efficient, safe, and reliable operation. Efficient communication and signal processing between modules improve the system's intelligence level and significantly enhance its fault detection and response capabilities. In particular, the STO device effectively solves the potential safety hazard of contactor adhesion, ensuring the safety and stability of elevator operation.

[0139] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A STO device for detecting the operation of a contactor, characterized in that, The operating contactor and the STO device form a power supply circuit. The operating contactor turns the power supply circuit on or off according to the control command of the motherboard. The STO device includes: The operating contactor detection module has a first signal input terminal that receives a power signal when the power supply circuit is turned on, a second signal input terminal that receives a self-test signal, and an output terminal that is connected to the main board to output a feedback signal to the main board based on the power signal and the self-test signal, so that the main board can detect the status of the operating contactor based on the feedback signal.

2. The STO device as claimed in claim 1, characterized in that, The operating contactor detection module includes: An isolation module, whose first input terminal is the first signal input terminal of the running contactor detection module, and whose second input terminal is the second signal input terminal of the running contactor detection module, to be turned on or off according to the power signal and the self-test signal; The signal output module has a first input terminal that receives a first voltage, a first output terminal that is connected to the third input terminal of the isolation module, and a second output terminal that is the output terminal of the running contactor detection module, so as to output an invalid feedback signal or a valid feedback signal according to the on / off state of the isolation module.

3. The STO device as described in claim 2, characterized in that, The isolation module includes: The first isolation unit has a first input terminal that is the second input terminal of the isolation module. Its second input terminal receives a first voltage to turn on or off according to the level of the self-test signal. The second isolation unit has a first input terminal that is the first input terminal of the isolation module, a second input terminal that is the third input terminal of the isolation module, and a first output terminal that is connected to the third input terminal of the first isolation unit, so as to turn on or off according to the power signal and the on / off state of the first isolation unit.

4. The STO device as described in claim 3, characterized in that, The first isolation unit includes: The first current limiting module has its first terminal being the first input terminal of the first isolation unit; The first optocoupler module has a first end that is the second input terminal of the first isolation unit, a second end that is connected to the second end of the first current limiting module, and a third end that is the third input terminal of the first isolation unit, so as to turn on or off according to the level state of the self-test signal.

5. The STO device as described in claim 3, characterized in that, The second isolation unit includes: The second current limiting module has its first terminal being the first output terminal of the second isolation unit; The second optocoupler module has a first terminal that is the first input terminal of the second isolation unit, a second terminal that is connected to the second terminal of the second current limiting module, and a third terminal that is the third input terminal of the second isolation unit, so as to turn on or off according to the on / off state of the first isolation unit and the state of the power signal.

6. The STO device as claimed in claim 2, characterized in that, The signal output module includes: The third current limiting module has a first terminal that is the first input terminal of the signal output module, a second terminal that is the first output terminal of the signal output module, and a third terminal that is the second output terminal of the signal output module, so as to output current from the first output terminal when the isolation module is turned on, and to output current from the second output terminal when the isolation module is turned off. A first energy storage device has a first terminal connected to the third terminal of the third current limiting module and a second terminal grounded, for discharging when the isolation module is turned on and charging when the isolation module is turned off.

7. The STO device according to any one of claims 1 to 6, characterized in that, The STO device also includes: A low-voltage power supply module is connected between the operating contactor and the operating contactor detection module to convert the power signal into a voltage and output a first power signal and a second power signal.

8. The STO device as claimed in claim 7, characterized in that, The operating contactor detection module includes: The first STO detection unit receives a first power signal at its first input terminal and a self-test signal at its second input terminal, and outputs a first feedback signal based on the first power signal and the self-test signal. The second STO detection unit receives a second power signal at its first input terminal and a self-test signal at its second input terminal, and outputs a second feedback signal based on the second power signal and the self-test signal. The logic unit has a first input terminal connected to the output terminal of the first STO detection unit, a second input terminal connected to the output terminal of the second STO detection unit, and an output terminal that is the output terminal of the running contactor detection module, so as to output a feedback signal based on the first feedback signal and the second feedback signal.

9. The STO device as claimed in claim 8, characterized in that, The first output terminal of the first STO detection unit is connected to the first input terminal of the control module, the second output terminal of the second STO detection unit is connected to the second input terminal of the control module, and the output terminal of the control module is connected to the second signal input terminal of the running contactor detection module. The control module outputs a self-test signal to the running contactor detection module, and detects the status of the running contactor based on the first feedback signal and the second feedback signal.

10. An elevator, characterized in that, The elevator includes the STO device, main board, and running contactor as described in any one of claims 1 to 9.

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