An elevator safety torque off circuit, device, and elevator

Abstract

This utility model proposes an elevator safety torque shutdown circuit, device, and elevator, including an STO signal conversion module, a microprocessor module, a buffer module, a star-sealing module, and a frequency converter module. The buffer module includes a first buffer, a second buffer, a third buffer, and a fourth buffer. A first drive signal terminal is connected to the first buffer, the first buffer is connected to the star-sealing module through the second buffer, the star-sealing module is connected to a first transistor, and the star-sealing module is connected to the lower transistor drive optocoupler. The OE terminal of the first buffer is connected to the OE terminal of the third buffer, and the OE terminal of the second buffer is connected to the OE terminal of the fourth buffer. The OE terminal of the first buffer is also connected to the STO signal conversion module and the microprocessor module. This application improves system safety performance without reducing response speed or accuracy. This utility model can be widely applied in the field of elevator technology.

Description

Technical Field

[0001] This utility model relates to the field of elevator technology, and in particular to an elevator safety torque shut-off circuit, device, and elevator. Background Technology

[0002] In elevator control systems, the Safe Torque Off (STO) function is a critical safety mechanism used to cut off the motor's power output during elevator maintenance or emergencies, ensuring the elevator does not start unexpectedly and thus protecting the safety of maintenance personnel or passengers. The STO function is typically implemented by cutting off the motor's power supply or control signal, ensuring the motor is in a de-energized state.

[0003] Existing STO (Stop-On) functionality implementations include directly cutting off the power supply via relays or contactors, which results in a slow response time; cutting off the motor via the inverter's output signal, which carries the risk of accidental activation; and controlling the inverter via drive signals, which relies on the reliability of the switching devices and poses safety risks.

[0004] In summary, the problems with the relevant technologies urgently need to be addressed. Utility Model Content

[0005] The purpose of this utility model is to at least partially solve one of the technical problems existing in the related technologies.

[0006] Therefore, one objective of this utility model is to provide an efficient elevator safety torque shut-off circuit, device, and elevator, comprising:

[0007] This utility model embodiment provides an elevator safety torque shutdown circuit, including: an STO signal conversion module, a microprocessor module, a buffer module, a star-sealing module, and a frequency converter module; the STO signal conversion module is connected to the microprocessor module, and the STO signal conversion module is connected to the buffer module; the buffer module is connected to the input terminal of the star-sealing module, and the output terminal of the star-sealing module is connected to the frequency converter module; the buffer module includes a first buffer, a second buffer, a third buffer, and a fourth buffer; a first drive signal terminal is connected to the first buffer, and the first buffer is connected to the second buffer via the third buffer. The system is connected to a star-sealing module, which is connected to a first transistor and a lower transistor drive optocoupler. A second drive signal terminal is connected to a third buffer, which is connected to the star-sealing module via a fourth buffer. The star-sealing module is connected to a second transistor and an upper transistor drive optocoupler. The OE terminal of the first buffer is connected to the OE terminal of the third buffer, and the OE terminal of the second buffer is connected to the OE terminal of the fourth buffer. The OE terminal of the first buffer is also connected to the STO signal conversion module and the microprocessor module. This application transmits drive signals through four buffers and drives the upper and lower transistor drive optocouplers through the first and second transistors respectively. This decoupled drive design of the upper and lower transistor drive optocouplers improves system safety performance without reducing response speed or accuracy.

[0008] In addition, the elevator safety torque shut-off circuit according to the above embodiments of this utility model may also have the following additional technical features:

[0009] Furthermore, in one embodiment of this utility model, the OE terminal of the first buffer is also connected to the STO signal conversion module, including: the OE terminal of the first buffer is connected to the enable signal terminal of the STO signal conversion module through a first resistor, the OE terminal of the first buffer is grounded through a first capacitor, and the enable signal terminal of the STO signal conversion module is connected to the power supply through a second resistor.

[0010] Furthermore, in one embodiment of this utility model, the STO signal conversion module includes: a first optocoupler and a third transistor; the anode of the first optocoupler is connected to a first STO signal, the cathode of the first optocoupler is connected to a second STO signal, the collector of the first optocoupler is an enable signal terminal, the emitter of the first optocoupler is grounded, the collector of the first optocoupler is connected to the base of the third transistor through a third resistor, the emitter of the third transistor is connected to a power supply, and the collector of the third transistor is a feedback signal terminal.

[0011] Furthermore, in one embodiment of the present invention, the first drive signal terminal is connected to the first buffer, comprising: the input channel of the first buffer is connected to the first drive signal terminal through a fourth resistor, the input channel of the first buffer is connected to the power supply through a fifth resistor, and the input channel of the first buffer is grounded through a second capacitor.

[0012] Furthermore, in one embodiment of this utility model, the OE terminal of the first buffer is also connected to the microprocessor module, including: the OE terminal of the first buffer is connected to the collector of the fourth transistor, the emitter of the fourth transistor is connected to the power supply, and the base of the fourth transistor is connected to the microprocessor module through a sixth resistor.

[0013] Furthermore, in one embodiment of this utility model, the first general-purpose port of the microprocessor module is connected to the feedback signal terminal.

[0014] Furthermore, in one embodiment of the present invention, the second general-purpose port of the microprocessor module is connected to the input channel of the first buffer, and the output channel of the first buffer is connected to the third general-purpose port of the microprocessor.

[0015] Furthermore, in one embodiment of this utility model, the star-sealing module is connected to the first transistor, comprising: the first port of the star-sealing module is connected to the base of the first transistor, the emitter of the first transistor is connected to a power supply, the collector of the first transistor is connected to the anode of the lower transistor driving optocoupler, the cathode of the lower transistor driving optocoupler is connected to the star-sealing module, and the output terminal of the lower transistor driving optocoupler is connected to a motor.

[0016] On the other hand, this application provides an elevator safety torque shutdown device, including the elevator safety torque shutdown circuit described above.

[0017] On the other hand, this application provides an elevator that includes the aforementioned elevator safety torque shut-off device.

[0018] The advantages and beneficial effects of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention:

[0019] An elevator safety torque shutdown circuit disclosed in this application includes: an STO signal conversion module, a microprocessor module, a buffer module, a star-sealing module, and a frequency converter module; the STO signal conversion module is connected to the microprocessor module, and the STO signal conversion module is also connected to the buffer module; the buffer module is connected to the input terminal of the star-sealing module, and the output terminal of the star-sealing module is connected to the frequency converter module; the buffer module includes a first buffer, a second buffer, a third buffer, and a fourth buffer; a first drive signal terminal is connected to the first buffer, and the first buffer is connected to the second buffer via the third buffer. The system is connected to a star-sealing module, which is connected to a first transistor and a lower transistor drive optocoupler. A second drive signal terminal is connected to a third buffer, which is connected to the star-sealing module via a fourth buffer. The star-sealing module is connected to a second transistor and an upper transistor drive optocoupler. The OE terminal of the first buffer is connected to the OE terminal of the third buffer, and the OE terminal of the second buffer is connected to the OE terminal of the fourth buffer. The OE terminal of the first buffer is also connected to the STO signal conversion module and the microprocessor module. This application transmits drive signals through four buffers and drives the upper and lower transistor drive optocouplers through the first and second transistors respectively. This decoupled drive design of the upper and lower transistor drive optocouplers improves system safety performance without reducing response speed or accuracy. Attached Figure Description

[0020] Figure 1 A schematic diagram of one embodiment of the elevator safety torque cutoff circuit provided in this application;

[0021] Figure 2 This is an electrical schematic diagram of one embodiment of the elevator safety torque shut-off circuit provided in this application. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the terms "length," "upper," "lower," "front," "rear," "left," "right," "top," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In elevator control systems, the Safe Torque Off (STO) function is a critical safety mechanism used to cut off the motor's power output during elevator maintenance or emergencies, ensuring the elevator does not start unexpectedly and thus protecting the safety of maintenance personnel or passengers. The STO function is typically implemented by cutting off the motor's power supply or control signal, ensuring the motor is in a de-energized state.

[0026] The existing STO functionality implementation methods mainly include the following:

[0027] 1. Direct power cut-off: Directly cut off the power supply to the motor using a relay or contactor. This method is simple and direct, but it has problems such as slow response speed and limited relay life.

[0028] 2. Controlling the inverter output: This method cuts off the motor's power output by controlling the inverter's output signal. While this method offers a faster response time, it relies heavily on the inverter's reliability and carries the risk of false triggering or failure.

[0029] The existing STO functionality implementation has the following problems:

[0030] 1. Slow response speed: In existing technologies, directly cutting off the power supply results in a slow response speed, which cannot meet the high safety requirements.

[0031] 2. Low reliability: The single-channel STO circuit has low reliability and may experience false triggering or failure.

[0032] 3. High system cost: Using pure hardware solutions such as contactors results in high system costs.

[0033] 4. Insufficient flexibility: Existing technology makes it difficult to simultaneously control the PWM drive signal and power supply signal of the IGBT drive optocoupler, which limits the implementation of the STO function.

[0034] This solution aims to address the aforementioned issues by providing an elevator safety torque shutdown circuit that offers fast response, high reliability, and low cost.

[0035] Therefore, this application proposes an elevator safety torque cutoff circuit, referring to... Figure 1 The schematic diagram of the elevator safety torque shutdown circuit shown in this application provides a detailed description of the elevator safety torque shutdown circuit proposed in this application.

[0036] The elevator safety torque shutdown circuit proposed in this application includes: an STO signal conversion module, a microprocessor module, a buffer module, a star-sealing module, and a frequency converter module; the STO signal conversion module is connected to the microprocessor module, and the STO signal conversion module is connected to the buffer module; the buffer module is connected to the input terminal of the star-sealing module, and the output terminal of the star-sealing module is connected to the frequency converter module.

[0037] The buffer module includes a first buffer, a second buffer, a third buffer, and a fourth buffer; a first drive signal terminal is connected to the first buffer, the first buffer is connected to the star-sealing module through the second buffer, the star-sealing module is connected to the first transistor, and the star-sealing module is connected to the lower transistor drive optocoupler; a second drive signal terminal is connected to the third buffer, the third buffer is connected to the star-sealing module through the fourth buffer, the star-sealing module is connected to the second transistor, and the star-sealing module is connected to the upper transistor drive optocoupler;

[0038] The OE terminal of the first buffer is connected to the OE terminal of the third buffer, and the OE terminal of the second buffer is connected to the OE terminal of the fourth buffer; the OE terminal of the first buffer is also connected to the STO signal conversion module, and the OE terminal of the first buffer is also connected to the microprocessor module.

[0039] In some possible implementations, this application uses a dual-channel design with four buffers to drive the upper and lower optocouplers separately, thereby improving safety performance. This application connects all OE terminals of the first buffer to all OE terminals of the third buffer, and connects all OE terminals of the second buffer to all OE terminals of the fourth buffer. Synchronous transmission of the drive signal is achieved through synchronous control of the buffers.

[0040] Furthermore, in one embodiment of this utility model, the OE terminal of the first buffer is also connected to the STO signal conversion module, including: the OE terminal of the first buffer is connected to the enable signal terminal of the STO signal conversion module through a first resistor, the OE terminal of the first buffer is grounded through a first capacitor, and the enable signal terminal of the STO signal conversion module is connected to the power supply through a second resistor.

[0041] See attached document Figure 2 The connection method between the first buffer and the STO signal conversion module is the same as that between the second buffer and the STO signal conversion module. For the first buffer, the OE terminal of the first buffer is connected to the enable signal terminal STO1EN of the STO signal conversion module through the first resistor R28, the OE terminal of the first buffer is grounded through the first capacitor C13, and the enable signal terminal of the STO signal conversion module is connected to the power supply through the second resistor R29. For the second buffer, the OE terminal of the second buffer is connected to the enable signal terminal STO2EN of the STO signal conversion module through the resistor R36, the OE terminal of the second buffer is grounded through the capacitor C14, and the enable signal terminal of the STO signal conversion module is connected to the power supply through the resistor R37. This application uses an RC structure to filter the enable signal of the STO signal conversion module, eliminate signal noise, and improve the accuracy of circuit operation.

[0042] Furthermore, in one embodiment of this utility model, the STO signal conversion module includes: a first optocoupler and a third transistor; the anode of the first optocoupler is connected to a first STO signal, the cathode of the first optocoupler is connected to a second STO signal, the collector of the first optocoupler is an enable signal terminal, the emitter of the first optocoupler is grounded, the collector of the first optocoupler is connected to the base of the third transistor through a third resistor, the emitter of the third transistor is connected to a power supply, and the collector of the third transistor is a feedback signal terminal.

[0043] The STO signal conversion module includes two signal conversion units: a first signal conversion unit and a second signal conversion unit. Both units have the same structure, comprising a first optocoupler and a third transistor. Specifically, for the first signal conversion unit, the first optocoupler is U1, the third transistor is Q1, the first STO signal is ST01+, the second STO signal is ST01-, the enable signal terminal is ST01EN, the third resistor is R5, and the feedback signal terminal is MCUST01. For the second signal conversion unit, the first optocoupler is U2, the third transistor is Q2, the first STO signal is ST02+, the second STO signal is ST02-, the enable signal terminal is ST02EN, the third resistor is R10, and the feedback signal terminal is MCUST02. This application uses a combination of optocouplers and transistors to generate enable and feedback signals from the STO signal. Compared to using two optocouplers, this reduces the occupied area of ​​the components and optimizes the PCB layout.

[0044] Furthermore, in one embodiment of the present invention, the first drive signal terminal is connected to the first buffer, comprising: the input channel of the first buffer is connected to the first drive signal terminal through a fourth resistor, the input channel of the first buffer is connected to the power supply through a fifth resistor, and the input channel of the first buffer is grounded through a second capacitor.

[0045] In this application, the connection method between the first drive signal terminal and the first buffer is the same as the connection method between the second drive signal terminal and the third buffer. Furthermore, the first buffer includes multiple input channels, and the connection method between each input channel and the drive signal terminal is also the same. (Refer to...) Figure 2 In this application, the first drive signal terminal can be any one of P_UN, P_VN, P_WN, and DRIVE_N; the fourth resistor is any one of R20 to R23; and the fifth resistor is any one of R24 to R27. The second capacitor is any one of C5 to C8. This application uses an RC structure to filter the input drive signal, remove signal noise, and improve the circuit performance.

[0046] Furthermore, in one embodiment of this utility model, the OE terminal of the first buffer is also connected to the microprocessor module, including: the OE terminal of the first buffer is connected to the collector of the fourth transistor, the emitter of the fourth transistor is connected to the power supply, and the base of the fourth transistor is connected to the microprocessor module through a sixth resistor.

[0047] It is understandable that the connection method between the first buffer and the microprocessor module is the same as the connection method between the second buffer and the microprocessor module. The fourth transistor could be... Figure 2The transistor Q3 or Q4 in the circuit is connected to the block enable signal terminal of the microprocessor module via the sixth resistor. The sixth resistor can be either resistor R30 or resistor R38.

[0048] Furthermore, in one embodiment of this utility model, the first general-purpose port of the microprocessor module is connected to the feedback signal terminal.

[0049] Furthermore, in one embodiment of the present invention, the second general-purpose port of the microprocessor module is connected to the input channel of the first buffer, and the output channel of the first buffer is connected to the third general-purpose port of the microprocessor.

[0050] The first general-purpose port of the microprocessor module can be either MCUSTO1 or MCUSTO2, and the second general-purpose port is the TEST port. The second general-purpose port of the microprocessor module connects to the first buffer, the second buffer, the third buffer, and the fourth buffer. The output channel of each of the four buffers is connected to the general-purpose port of the microprocessor module.

[0051] Furthermore, in one embodiment of this utility model, the star-sealing module is connected to the first transistor, comprising: the first port of the star-sealing module is connected to the base of the first transistor, the emitter of the first transistor is connected to a power supply, the collector of the first transistor is connected to the anode of the lower transistor driving optocoupler, the cathode of the lower transistor driving optocoupler is connected to the star-sealing module, and the output terminal of the lower transistor driving optocoupler is connected to a motor.

[0052] The circuit provided in this application will now be described in detail with reference to a specific embodiment:

[0053] This application addresses the aforementioned deficiencies in the prior art by providing an elevator safety torque shutdown circuit.

[0054] like Figure 1 , Figure 2 As shown:

[0055] The elevator safety torque shutdown circuit consists of an STO signal conversion module (1), an MCU minimum system / microprocessor module (2), a buffer module (3), and peripheral circuits including a star-sealing module (4) and a frequency converter module (5). The STO signal conversion module (1) is connected to the MCU minimum system (2) and the buffer module (3). The buffer module (3) is connected to the input terminal of the star-sealing module (4), and the output terminal of the star-sealing module (4) is connected to the IGBT drive optocoupler module (51). The frequency converter module (5) controls the on / off state of the upper and lower transistors of the IGBT module through the IGBT drive optocoupler module (51), thereby realizing the control of the motor.

[0056] The STO signal conversion module (1) is used to receive and convert externally input STO signals and output STO feedback signals. Specifically, it receives and converts externally input STO1+, STO1-, STO2+, and STO2- signals into STO enable signals—STO1EN and STO2EN signals, and transmits STO1EN and STO2EN signals to the enable terminal of the buffer module (3); it outputs STO feedback signals—MCUSTO1 and MCUSTO2 signals—to the MCU minimum system (2). When the external STO signals (STO1+STO1-, STO2+STO2-) are all low, the STO enable signals (STO1EN, STO2EN) are all high, and the STO feedback signals (MCUSTO1, MCUSTO2) are all low. The buffer module (3) shuts down the output of the IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN). When the external STO signals (STO1+STO1-, STO2+STO2-) are all high, the STO enable signals (STO1EN, STO2EN) are all low, and the STO feedback signals (MCUSTO1, MCUSTO2) are all high. The buffer module (3) The output of the IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) is not turned off; when the external STO signals (STO1+STO1-, STO2+STO2-) are one high level and one low level, the STO enable signals (STO1EN, STO2EN) are one high and one low, the STO feedback signals (MCUSTO1, MCUSTO2) are one high and one low, and the buffer module (3) turns off the output of the IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN). The STO signal conversion module consists of optocouplers (U1, U2), PNP transistors (Q1, Q2), resistors (R1-R14, R28-R29, R36-R37), and capacitors (C1-C4, C13, C14).

[0057] The buffer module (3) is used to receive the externally provided IGBT upper and lower transistor PWM drive signals (P_UP, P_VP, P_WP, P_UN, P_VN, P_WN) and IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_P, DRIVE_N); and to perform corresponding operations according to the STO enable signals (STO1EN, STO2EN). When both STO enable signals (STO1EN, STO2EN) are high or one is high and the other is low, the IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DO) are turned off. When the STO enable signals (STO1EN, STO2EN) are both low, the IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) are transmitted to the peripheral circuit star-sealing module (4) and the IGBT drive optocoupler module (51) to drive the frequency converter to control the motor output torque; and receive the test signal (TEST) sent by the MCU minimum system (2), and output the running status feedback signal (Re-TEST1, Re-TEST2, Re-TEST3, Re-TEST4) to the MCU minimum system (2). The buffer module (3) consists of four low-level active six-channel tri-state buffer chips (third buffer U6, fourth buffer U7, first buffer U8, second buffer U9), resistors (R15-R27, R32-R35, R40-R59), and capacitors (C5-C12), where U6 and U7 are connected in series, and U8 and U9 are connected in series. When any of its enable pins OE1 (pin 1) or OE2 (pin 19) receives a high level, the output is blocked.

[0058] The MCU minimum system (2) is used to monitor and diagnose whether the operation of the STO signal conversion module (1) and the buffer module (3) is normal. When the abnormal operation status of any module is detected, the output of the blocking forced enable signal (MCUEN1, MCUEN2) forces the buffer module (3) to shut down the output. Specifically: 1. For the STO signal conversion module (1), by receiving the STO feedback signal (MCUSTO1, MCUSTO2) and comparing and judging the STO feedback signal (MCUSTO1, MCUSTO2), when the level states of the STO feedback signal (MCUSTO1, MCUSTO2) are inconsistent (i.e. one high and one low), it is judged that the STO signal conversion module (1) is abnormally operating, and the output of the blocking forced enable signal (MCUEN1, MCUEN2) forces the buffer module (3) to shut down the output of the IGBT upper and lower transistor PWM drive signal (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signal (DRIVE_UP, DRIVE_DOWN). 2. For the buffer module (3), the test signal (TEST) sent by the MCU (23) is compared with the received operating status feedback signal (Re-TEST1, Re-TEST2, Re-TEST3, Re-TEST4) by the internal running algorithm of the MCU (23). When it is determined that the operating status of any buffer (21 / 22 / 23 / 24) is abnormal, the minimum system of the MCU (2) outputs the blocking forced enable signal (MCUEN1, MCUEN2), and forces all buffers (21 / 22 / 23 / 24) to shut down the output.Taking one of the buffers (31) of the buffer module (3) as an example, when the STO enable signal STO1EN issued by the STO signal conversion module (1) is at a high level, the received running status feedback signal (Re-TEST1) is at a high level, then the buffer module (31) is fault-free; otherwise, the buffer module (31) is determined to be faulty, and the blocking forced enable signal (MCUEN1, MCUEN2) is output to force the buffer module (3) to turn off the IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE) _DOWN) output; when the STO enable signal STO1EN issued by the STO signal conversion module (1) is low, the received running status feedback signal (Re-TEST1) is consistent with the test signal (TESTIN), then the buffer module (31) is fault-free, otherwise the buffer (31) is faulty and outputs the blocking forced enable signal (MCUEN1, MCUEN2), forcing the buffer module (3) to turn off the output of the IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN). The minimum MCU system (2) consists of an MCU (25), a level conversion circuit 1 (21), and a level conversion circuit 2 (22). The MCU is U5. The level conversion circuit 1 (21) consists of a PNP transistor Q3 and a resistor (R30-R31). The level conversion circuit 2 (22) consists of a PNP transistor Q4 and a resistor (R38-R39).

[0059] The peripheral circuit star-blocking module (4) is used to perform the star-blocking function. It receives the IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) output by the buffer module (3), and outputs the IGBT upper and lower transistor PWM drive signals (PWM_UP1, PWM_VP1, PWM_WP1, PWM_UN1, PWM_VN1, PWM_WN1) and IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP1, DRIVE_DOWN1) to the inverter module (5).

[0060] The peripheral circuit inverter module (5) consists of an IGBT drive optocoupler module (51), which is used to receive the IGBT upper and lower transistor PWM drive signals (PWM_UP1, PWM_VP1, PWM_WP1, PWM_UN1, PWM_VN1, PWM_WN1) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP1, DRIVE_DOWN1), and output the motor torque according to the signals. The IGBT drive optocoupler module (51) consists of an IGBT upper transistor drive optocoupler (U10-U12) and a PNP transistor (Q6), an IGBT lower transistor drive optocoupler (U13-U15) and a PNP transistor (Q5, the first transistor). The DRIVE_UP1 signal is the power supply drive signal for the IGBT upper transistor drive optocouplers U10, U11, and U12, and the DRIVE_DOWN1 signal is the power supply drive signal for the IGBT lower transistor drive optocouplers U13, U14, and U15. Taking DRIVE_UP1 as an example, when DRIVE_UP1 is low, transistor Q5 is turned on, and the IGBT upper transistor drives optocouplers U10, U11, and U12 to receive 5V power supply; when DRIVE_UP1 is high, transistor Q6 (the second transistor) is turned off, and the 5V power supply to the IGBT upper transistor drives optocouplers U10, U11, and U12 is disconnected. The IGBT drive optocoupler module (51) needs to receive both the IGBT upper and lower transistor PWM drive signals (PWM_UP1, PWM_VP1, PWM_WP1, PWM_UN1, PWM_VN1, PWM_WN1) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP1, DRIVE_DOWN1) simultaneously in order to control the IGBT module switching and output motor torque.

[0061] When the buffer module (3) closes the signal output, since there is a pull-up resistor at the output of the buffer (21 / 22 / 23 / 24), the output IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) are all at high level. Under the premise that the external circuit star-blocking module (4) does not perform the star-blocking function, the IGBT upper and lower transistor PWM drive signals (PWM_UP1, PWM_VP1, PWM_WP1, PWM_UN1, PWM_VN1, PWM_WN1) and IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP1, DRIVE_DOWN1) are also all at high level. At this time, transistors Q5 and Q6 are cut off, and the 5V power supply of IGBT upper transistor drive optocoupler (U10-U12) and IGBT lower transistor drive optocoupler (U13-U15) is disconnected.

[0062] This system aims to disconnect the PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) of the upper and lower IGBT transistors, while simultaneously disconnecting the power supply signals (DRIVE_UP, DRIVE_DOWN) of the optocouplers driving the upper and lower transistors, thereby achieving dual-channel redundancy and making elevator operation safer and more reliable.

[0063] An example of an elevator safety torque cut-off circuit. Figure 2 As shown:

[0064] The elevator safety torque shutdown circuit consists of an STO signal conversion module (1), an MCU minimum system (2), a buffer module (3), and a peripheral circuit sealing module (4) and a frequency converter module (5).

[0065] The STO signal conversion module (1) consists of optocouplers (U1, U2), PNP transistors (Q1, Q2), resistors (R1-R14, R28-R29, R36-R37), and capacitors (C1-C4, C13, C14). The STO signal conversion module (1) converts the externally input DC24V STO signals (STO1+, STO1-, STO2+, STO2-) into DC5V STO1EN, STO2EN signals and DC3.3V MCUSTO1, MCUSTO2 signals.

[0066] The buffer module (3) consists of four low-level active six-channel tri-state buffer chips SN74HC365PWR (U6, U7, U8, U9) connected in series. When any enable pin OE1 (pin 1) or OE2 (pin 19) of the buffer chip receives a high level, the chip shuts down the output; when all enable pins OE1 (pin 1) and OE2 (pin 19) of the buffer chip receive a low level, the chip does not shut down the output. The four input channels A1-A4 of U6 are connected to the DRIVE_P, P_UP, P_VP, and P_WP signals respectively. Output channels Y1-Y4 are connected to A1-A4 of U7 respectively. U7's Y1-A3 outputs DRIVE_UP, PWM_UP, PWM_VP, and PWM_WP. The four input channels A1-A4 of U8 are connected to the DRIVE_N, P_UN, P_VN, and P_WN signals respectively. Output channels Y1-Y4 are connected to A1-A4 of U9 respectively. U9's Y1-Y4 outputs DRIVE_DOWN, PWM_UN, PWM_VN, and PWM_WN. Furthermore, all output pins used by U6, U7, U8, and U9 must be connected to pull-up resistors to 5V. Taking U6 as an example, when the STO enable signal STO1EN is low, the outputs of Y1-Y4 are consistent with the received DRIVE_P, P_UP, P_VP, and P_WP signals; when the STO enable signal STO1EN is high, the outputs of Y1-Y4 are high.

[0067] The MCU minimum system (2) consists of an MCU (21) and level conversion circuit 1 (21) and level conversion circuit 2 (22). The MCU U5 uses the chip GD32F303CCT6. The level conversion circuit 1 (21) consists of a PNP transistor Q3 and a resistor (R30-R31). The level conversion circuit 2 (22) consists of a PNP transistor Q4 and a resistor (R38-R39). 1. When the STO feedback signals MCUSTO1 and MCUSTO2 are both high or both low, the MCU minimum system (2) determines that the STO signal conversion module (1) is operating normally and outputs the block-off forced enable signals MCUEN1 and MCUEN2 as high. The MCU minimum system (2) does not interfere with the operation of the buffer module (3). The buffer module (3) is controlled by the STO signal conversion module (1), i.e., the external STO signals (STO1+STO1-, STO2+STO2-). When the STO feedback signals MCUSTO1 and MCUSTO2 are both high or both low, the MCU minimum system (2) determines that the STO signal conversion module (1) is operating normally and outputs the block-off forced enable signals MCUEN1 and MCUEN2 as high. The MCU minimum system (2) does not interfere with the operation of the buffer module (3). The buffer module (3) is controlled by the STO signal conversion module (1), i.e., the external STO signals (STO1+STO1-, STO2+STO2-). When the TO2 signal is one high and one low, the MCU minimum system (2) determines that the STO signal conversion module (1) is malfunctioning and outputs the blocking forced enable signals MCUEN1 and MCUEN2 as low. At this time, transistors Q3 and Q4 are turned on, forcing the buffer module (3) to shut down the output. The IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) are all high. 2. For the buffer module (3), the MCU minimum system (2) sends a high and low level test signal TEST every 2ms, with each high and low level occupying 1ms. By comparing the received operating status feedback signals (Re-TEST1, Re-TEST2, Re-TEST3, Re-TEST4) to determine whether they meet the expectations, the operating status of the buffer module (3) is normal.Taking one of the buffers (31) of the buffer module (3) as an example, when the STO enable signal STO1EN issued by the STO signal conversion module (1) is at a high level, the received running status feedback signal (Re-TEST1) is at a high level. Then the MCU minimum system (2) determines that the buffer (31) is running normally and outputs the blocking forced enable signals MCUEN1 and MCUEN2 at a high level. The MCU minimum system (2) does not interfere with the operation of the buffer module (3). The buffer module (3) is controlled by the STO signal conversion module (1), that is, the external STO signal (STO1+ STO1-, STO2+STO2-) control; otherwise, the MCU minimum system (2) determines that the buffer (31) is abnormally running, and the output is blocked. The forced enable signals MCUEN1 and MCUEN2 are low. At this time, transistors Q3 and Q4 are turned on, and the buffer module (3) is forced to shut down the output. The IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) are all high. When the STO enable signal STO1EN issued by the STO signal conversion module (1) is low, the received running status feedback signal (Re-TEST1) is high. If it is consistent with the test signal (TESTIN), the MCU minimum system (2) determines that the buffer (31) is running normally and outputs the blocking forced enable signals MCUEN1 and MCUEN2 as high. The MCU minimum system (2) does not interfere with the operation of the buffer module (3). The buffer module (3) is controlled by the STO signal conversion module (1), that is, the external STO signal (STO1+STO1). -、STO2+STO2-) control; otherwise, the MCU minimum system (2) determines that the buffer (31) is abnormally running, and the output is blocked. The forced enable signals MCUEN1 and MCUEN2 are low. At this time, transistors Q3 and Q4 are turned on, and the buffer module (3) is forced to shut down the output. The IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) are all high.

[0068] The DRIVE_UP1 signal is the power supply drive signal for the IGBT upper-side drive optocouplers U10, U11, and U12, while the DRIVE_DOWN1 signal is the power supply drive signal for the IGBT lower-side drive optocouplers U13, U14, and U15. Taking DRIVE_UP1 as an example, when DRIVE_UP1 is low, transistor Q5 is turned on, and the IGBT upper-side drive optocouplers U10, U11, and U12 receive a 5V power supply; when DRIVE_UP1 is high, transistor Q6 is turned off, and the 5V power supply to the IGBT upper-side drive optocouplers U10, U11, and U12 is disconnected.

[0069] When the buffer module (3) closes the signal output, since there is a pull-up resistor at the output of the buffer (21 / 22 / 23 / 24), the output IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) are all at high level. Under the premise that the external circuit star-blocking module (4) does not perform the star-blocking function, the IGBT upper and lower transistor PWM drive signals (PWM_UP1, PWM_VP1, PWM_WP1, PWM_UN1, PWM_VN1, PWM_WN1) and IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP1, DRIVE_DOWN1) are also all at high level. At this time, transistors Q5 and Q6 are cut off, and the 5V power supply of IGBT upper transistor drive optocoupler (U10-U12) and IGBT lower transistor drive optocoupler (U13-U15) is disconnected.

[0070] Safe torque shutdown function: When the external STO signal (STO1+STO1-, STO2+STO2-) is high and the MCU minimum system (2) does not detect a fault in the STO signal conversion module (1) or the buffer module (3), the IGBT upper and lower transistor PWM drive signals (P_UP, P_VP, P_WP, P_UN, P_VN, P_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_P, DRIVE_N) can pass through the buffer module (3). The output IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) are connected to the input IGBT upper and lower transistor PWM drive signals (P_UP, P_VP, P_WP, P_UN, P_VN, P_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN). The power supply signals (DRIVE_P, DRIVE_N) for the upper and lower transistors are consistent. When the external STO signal (STO1+STO1-, STO2+STO2-) is low or the MCU minimum system (2) detects a fault in the STO signal conversion module (1) or the buffer module (3), the buffer module (3) shuts down the output of the IGBT upper and lower transistor PWM drive signals (P_UP, P_VP, P_WP, P_UN, P_VN, P_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_P, DRIVE_N). At this time, since there is a pull-up resistor at the output of the buffer module (3), the output of the IGBT upper and lower transistor PWM drive signals (PWM_UP, PWM_VP, PWM_WP, PWM_UN, PWM_VN, PWM_WN) and the IGBT upper and lower transistor drive optocoupler power supply signals (DRIVE_UP, DRIVE_DOWN) are all high.

[0071] The circuit provided in this application offers fast response speed: by controlling the drive signal and power supply signal of the IGBT drive optocoupler, the inverter output can be quickly cut off, improving the response speed of the STO function. High reliability: Adopting a dual-channel design, it simultaneously controls the output of the drive signal and power supply signal of the IGBT lower and upper transistor drive optocoupler, providing redundancy and making the system safer and more reliable. Real-time monitoring and fault diagnosis: by monitoring the output status of each functional module, the operating status of the STO function can be detected in real time, allowing for timely fault detection and handling, improving system safety.

[0072] On the other hand, this application provides an elevator safety torque shutdown device, including the elevator safety torque shutdown circuit described above.

[0073] On the other hand, this application provides an elevator that includes the aforementioned elevator safety torque shut-off device.

[0074] In the description of this specification, references to terms such as "one embodiment," "another embodiment," or "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An elevator safety torque cut-off circuit, characterized in that, include: The system comprises an STO signal conversion module, a microprocessor module, a buffer module, a star-sealing module, and a frequency converter module; the STO signal conversion module is connected to the microprocessor module, and the STO signal conversion module is connected to the buffer module; the buffer module is connected to the input terminal of the star-sealing module, and the output terminal of the star-sealing module is connected to the frequency converter module. The buffer module includes a first buffer, a second buffer, a third buffer, and a fourth buffer; a first drive signal terminal is connected to the first buffer, the first buffer is connected to the star-sealing module through the second buffer, the star-sealing module is connected to the first transistor, and the star-sealing module is connected to the lower transistor drive optocoupler; a second drive signal terminal is connected to the third buffer, the third buffer is connected to the star-sealing module through the fourth buffer, the star-sealing module is connected to the second transistor, and the star-sealing module is connected to the upper transistor drive optocoupler; The OE terminal of the first buffer is connected to the OE terminal of the third buffer, and the OE terminal of the second buffer is connected to the OE terminal of the fourth buffer; the OE terminal of the first buffer is also connected to the STO signal conversion module, and the OE terminal of the first buffer is also connected to the microprocessor module.

2. The elevator safety torque cutoff circuit according to claim 1, characterized in that, The OE terminal of the first buffer is also connected to the STO signal conversion module, including: the OE terminal of the first buffer is connected to the enable signal terminal of the STO signal conversion module through a first resistor, the OE terminal of the first buffer is grounded through a first capacitor, and the enable signal terminal of the STO signal conversion module is connected to the power supply through a second resistor.

3. The elevator safety torque cutoff circuit according to claim 1, characterized in that, The STO signal conversion module includes: a first optocoupler and a third transistor; the anode of the first optocoupler is connected to a first STO signal, the cathode of the first optocoupler is connected to a second STO signal, the collector of the first optocoupler is an enable signal terminal, the emitter of the first optocoupler is grounded, the collector of the first optocoupler is connected to the base of the third transistor through a third resistor, the emitter of the third transistor is connected to a power supply, and the collector of the third transistor is a feedback signal terminal.

4. The elevator safety torque cutoff circuit according to claim 1, characterized in that, The first drive signal terminal is connected to the first buffer, including: the input channel of the first buffer is connected to the first drive signal terminal through a fourth resistor, the input channel of the first buffer is connected to the power supply through a fifth resistor, and the input channel of the first buffer is grounded through a second capacitor.

5. The elevator safety torque cut-off circuit according to claim 1, characterized in that, The OE terminal of the first buffer is also connected to the microprocessor module, including: the OE terminal of the first buffer is connected to the collector of the fourth transistor, the emitter of the fourth transistor is connected to the power supply, and the base of the fourth transistor is connected to the microprocessor module through a sixth resistor.

6. The elevator safety torque cut-off circuit according to claim 1, characterized in that, The first general-purpose port of the microprocessor module is connected to the feedback signal terminal.

7. The elevator safety torque cut-off circuit according to claim 1, characterized in that, The second general-purpose port of the microprocessor module is connected to the input channel of the first buffer, and the output channel of the first buffer is connected to the third general-purpose port of the microprocessor.

8. The elevator safety torque cut-off circuit according to claim 1, characterized in that, The star-sealing module is connected to the first transistor, including: the first port of the star-sealing module is connected to the base of the first transistor, the emitter of the first transistor is connected to a power supply, the collector of the first transistor is connected to the anode of the lower transistor driving optocoupler, the cathode of the lower transistor driving optocoupler is connected to the star-sealing module, and the output terminal of the lower transistor driving optocoupler is connected to a motor.

9. An elevator safety torque shut-off device, characterized in that, The device includes an elevator safety torque shutdown circuit as described in any one of claims 1 to 8.

10. An elevator, characterized in that, The elevator includes the elevator safety torque shut-off device as described in claim 9.

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