Safety torque cut-off control circuit and short-circuit braking coil, and lift devices.

Abstract

Invention details;

Description

Safe torque off and star-off control circuits and elevator equipment

[0001] Priority information

[0002] This application claims priority and benefits of patent application No. 202310967789.7 filed with the State Intellectual Property Office of China on August 2, 2023, and the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of elevators, and in particular to a safety torque off and star-off control circuit and an elevator device. Background Art

[0004] In applications such as motor drives and elevator controls, system safety requirements are becoming increasingly stringent. Safe Torque Off (STO) and grounding have become essential safety features. Currently, conventional elevator electronic control designs implement safe torque off and grounding via a main contactor between the inverter module and the motor, or with a main contactor and grounding contactor on the inverter module input side. However, as elevator power levels increase, contactor costs rise accordingly. Furthermore, contactors generate a high level of noise each time they operate, compromising the elevator experience.

[0005] In related technologies, a STO + electronic star-off solution (with IGBTs as the actuator for electronic star-off) can be used to replace the star-off contactor and main contactor to achieve safe torque off and star-off. However, STO and electronic star-off pose the risk of short circuits in logic control, which can damage the IGBTs.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a safe torque off and star-off control circuit and an elevator device.

[0008] The safe torque off and star-sealing control circuit of the embodiment of the present application is used for elevator equipment. The safe torque off and star-sealing control circuit includes a safety protection module, a safe torque off module, a frequency conversion module and a control module. The frequency conversion module includes a switch unit, a drive unit and a star-sealing control unit. The switch unit is connected to a power supply, and the drive unit is connected to the switch unit, the star-sealing control unit and the traction machine of the elevator equipment.

[0009] The safety protection module is connected to the safety torque shutdown module and is used to generate a shutdown signal when the elevator equipment stops, fails, or the safety protection module is disconnected;

[0010] The safe torque off module is connected to the control module, the switch unit and the drive unit, and is configured to shut down according to the shutdown signal, so that the control module stops sending the control signal to the drive unit, and controls the switch unit to shut down according to the shutdown signal;

[0011] The control module is also connected to the safety protection module, and is used to generate a star-off instruction according to the status of the safety protection module and the safe torque off module, so that the star-off control unit controls the drive unit and the traction machine to short-circuit according to the star-off instruction to achieve electronic star-off.

[0012] In some embodiments, the safety protection module is further configured to send a star-lock cancellation instruction to the control module and the safe torque off module;

[0013] The control module is further configured to control the star-sealing control unit to be disconnected according to the star-sealing cancellation instruction, so that the drive unit is disconnected and short-circuited with the traction machine;

[0014] The safe torque off module is used to control the switching unit to be turned on according to the star-off cancellation instruction;

[0015] The safety protection module is further configured to send a conduction instruction to the safe torque off module, so that the control module is connected to the drive unit through the safe torque off module.

[0016] In some embodiments, the safe torque off module is further configured to disconnect the control module from the drive unit when the safety protection module is disconnected;

[0017] The control module is further configured to determine the speed of the traction machine according to the traction machine coding information of the elevator equipment, and generate a star-sealing instruction when the traction machine speed is less than a speed threshold, so that the star-sealing control unit controls the drive unit and the traction machine to short-circuit according to the star-sealing instruction to achieve electronic star-sealing.

[0018] In certain embodiments, the safe torque off module includes:

[0019] a control switch, connecting the control module, the safety protection module and the drive unit, and configured to disconnect the control module from the drive unit according to a shutdown signal from the safety protection module, so that the control module stops sending control signals to the drive unit;

[0020] A safe torque off controller is connected to the control module and the switch unit, and is used to control the switch unit to be turned off when the control switch is turned off.

[0021] In some embodiments, the driving unit includes a driver and an insulated gate bipolar transistor;

[0022] The driver is connected to the control switch, the star-sealing control unit and the insulated gate bipolar transistor, and is used to control the insulated gate bipolar transistor according to the control signal transmitted by the control module to make the traction machine run, and to short-circuit the insulated gate bipolar transistor and the traction machine according to the control instruction of the star-sealing control unit to achieve electronic star-sealing.

[0023] In some embodiments, the insulated gate bipolar transistor includes an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm are simultaneously turned on in an electronically locked state.

[0024] In some embodiments, the safety protection module includes a safety controller, a first switch tube and a second switch tube;

[0025] The safety controller is connected to the control module and the first switch tube, and is used to control the first switch tube to output a shutdown signal when the elevator equipment stops;

[0026] The first electrode of the first switch tube is connected to the power supply end, the second electrode is connected to the second switch tube, and the control electrode is connected to the safety controller and the control module;

[0027] The first electrode of the second switching tube is connected to the second electrode of the first switching tube, the second electrode is connected to the control switch, and the control electrode is connected to the star-sealing control unit.

[0028] In some embodiments, the safety protection module includes a safety controller, a first switch tube and a buffer;

[0029] The safety controller is connected to the control module and the first switch tube, and is used to control the first switch tube to output a shutdown signal when the elevator equipment stops;

[0030] The first electrode of the first switch tube is connected to the power supply end, the second electrode is connected to the control switch, and the control electrode is connected to the safety controller and the control module;

[0031] The buffer is connected to the control module, the control switch and the satellite sealing control unit respectively, and is used to disconnect the control module and the control switch when the satellite sealing control unit is working.

[0032] In some embodiments, the switch unit includes:

[0033] A third switching tube, wherein a first electrode of the third switching tube is connected to the power supply, a second electrode is connected to the drive unit, and a control electrode is connected to the safe torque off controller.

[0034] In some embodiments, the frequency conversion module further includes:

[0035] a rectifier unit, connected to the power supply and the switch unit;

[0036] A bus capacitor is connected in parallel with the rectifier unit.

[0037] In some embodiments, the frequency conversion module further includes:

[0038] a braking resistor connected to the switch unit;

[0039] A fourth switching tube has a first electrode connected to the braking resistor and a second electrode connected to the switching unit.

[0040] The elevator device according to the embodiment of the present application includes a traction machine and the above-mentioned safe torque off and star-off control circuit.

[0041] In the safe torque shutdown and star-sealing control circuit and elevator equipment of the embodiment of the present application, a shutdown signal is generated by the safety protection module when the elevator stops normally, thereby controlling the shutdown of the safe torque shutdown module, so that the control module stops sending control signals to the drive unit, realizing the safe torque shutdown function of the traction machine, and at the same time controlling the switch unit to disconnect the power supply from the drive unit to prevent the power supply to the drive unit, and then generating a star-sealing instruction according to the status of the safety protection module and the safe torque shutdown module through the control module, so that the star-sealing control unit controls the short-circuit of the drive unit and the traction machine according to the star-sealing instruction to realize electronic star-sealing. In this way, the two working modes of electronic star-sealing and safe torque shutdown are independent and do not cause mutual conflict. At the same time, the mutually locked working logic is also guaranteed, avoiding the risk of electronic star-sealing and safe torque shutdown causing the drive unit to work at the same time.

[0042] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and / or additional aspects and advantages of the present application will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0044] FIG1 is a schematic diagram of a module of a safe torque off and star-off control circuit according to certain embodiments of the present application;

[0045] FIG2 is a circuit diagram of a safe torque off and star-off control circuit according to certain embodiments of the present application;

[0046] FIG3 is a circuit diagram of a safe torque off and star-off control circuit according to certain embodiments of the present application;

[0047] FIG4 is a schematic diagram of a module of an elevator device according to certain embodiments of the present application.

[0048] Description of main component symbols:

[0049] 100- Elevator equipment, 10- Safe torque off and star-sealing control circuit, 11- Safety protection module, 111- Safety controller, Q1- First switch tube, Q2- Second switch tube, B1- Buffer, 12- Safe torque off module, K1- Control switch, 121- Safe torque off controller, 13- Frequency conversion module, 131- Switch unit, Q3- Third switch tube, 132- Drive unit, 1321- Driver, IGBT- Insulated Gate Bipolar Transistor, 133- Star-sealing control unit, 134- Rectifier unit, C1- Bus capacitor, R1- Braking resistor, Q4- Fourth switch tube, 14- Control module, AC- Power supply, DC- Power supply end, Traction machine 30. DETAILED DESCRIPTION

[0050] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0051] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0053] The disclosure below provides many different embodiments or examples for implementing the various circuits of the present application. To simplify the disclosure of the present application, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0054] In applications such as motor drives and elevator control, system safety requirements are becoming increasingly stringent. Safe Torque Off (STO) and star-off have become essential safety features. Currently, conventional elevator electronic control designs implement safe torque off and star-off through a main contactor between the inverter module and the motor, or by designing a main contactor and star-off contactor on the inverter module input side.

[0055] As competition intensifies and elevator power levels rise, contactor costs are also rising. Furthermore, contactors generate a lot of noise each time they operate, compromising the elevator experience. Consequently, low-cost, compact STO solutions (such as functional safety devices or safety circuit devices) are attracting increasing attention. STO solutions utilize a motor controller to shut down the inverter bridge arm drive signal (disconnecting the drive signal power supply and / or blocking the drive signal output) to achieve a safe torque off function.

[0056] In the related art, the STO+electronic star-sealing solution (i.e., IGBT as the execution unit of electronic star-sealing) can be used to replace the star-sealing contactor and the main contactor to realize safe torque shutdown and star-sealing. However, when realizing the safe torque shutdown function, it is usually necessary to shut down the drive signal output of the inverter bridge arm. However, when realizing the star-sealing function, it is necessary to open the upper three-way devices or the lower three-way devices of the three-phase inverter bridge arm. It can be seen that the realization of the star-sealing function conflicts with the above-mentioned safe torque shutdown function, which easily causes the risk of damage to the IGBT; there is also the risk that the IGBT is affected by the star-sealing current in the electronic star-sealing working mode, and has insufficient capacity for long-term work, or the IBGT fails due to temperature rise;

[0057] In view of this, referring to FIG1 , an embodiment of the present application provides a safe torque off and star-sealing control circuit 10 for use in elevator equipment. The safe torque off and star-sealing control circuit 10 includes a safety protection module 11, a safe torque off module 12, a frequency conversion module 13, and a control module 14. The frequency conversion module 13 includes a switch unit 131, a drive unit 132, and a star-sealing control unit 133. The switch unit 131 is connected to an AC power source, and the drive unit 132 is connected to the switch unit 131, the star-sealing control unit 133, and the traction machine of the elevator equipment 100.

[0058] The safety protection module 11 is connected to the safety torque off module 12. The safety protection module 11 is used to generate a shutdown signal when the elevator equipment 100 stops, fails or the safety protection module 11 is disconnected. The safety torque off module 12 is connected to the control module 14, the switch unit 131 and the drive unit 132. The safety torque off module 12 is used to shut down according to the shutdown signal, so that the control module 14 stops sending the control signal to the drive unit 132, and controls the switch unit 131 to shut down according to the shutdown signal. The control module 14 is also connected to the safety protection module 11. The control module 14 is used to generate a star-sealing instruction according to the status of the safety protection module 11 and the safety torque off module 12, so that the star-sealing control unit 133 controls the drive unit 132 to short-circuit the traction machine according to the star-sealing instruction to achieve electronic star-sealing.

[0059] In the safe torque off and star-off control circuit 10 of the embodiment of the present application, the safety protection module 11 generates a shutdown signal when the elevator equipment stops normally, fails, or the safety protection module 11 is disconnected, thereby controlling the safe torque off module 12 to shut down, so that the control module 14 stops sending control signals to the drive unit 132, thereby realizing the safe torque off function of the traction machine. At the same time, the switch unit 131 is controlled to disconnect the power supply AC from the drive unit 132 to prevent the power supply AC from supplying power to the drive unit 132. Then, the control module 14 generates a star-off instruction based on the status of the safety protection module 11 and the safe torque off module 12, so that the star-off control unit 133 controls the drive unit 132 to short-circuit the traction machine according to the star-off instruction to realize electronic star-off. In this way, the two operating modes of electronic star-off and safe torque off are ensured to be independent and do not cause conflict with each other. At the same time, the mutually locked working logic is also guaranteed, thereby avoiding the risk of the drive unit being damaged by the simultaneous operation of electronic star-off and safe torque off. Moreover, compared with the related art, the response time of electronic star-off and safe torque shutdown is shortened, the operating efficiency of the safe torque shutdown and star-off control circuit 10 is improved, the noise is reduced, and the performance of the elevator equipment 100 is further improved.

[0060] It should be noted that the AC power supply can be three-phase. In the normal elevator operation mode, data can be exchanged between the safety protection module 11, the safe torque off module 12, and the control module 14 via a bus protocol. Furthermore, the control module 14 can also be connected to the safe torque off module 12 via an I / O line to obtain the status of the safe torque off module 12.

[0061] It should also be noted that the safety protection module 11 can obtain operating signals of the elevator device 100. For example, the safety protection module 11 can be connected to the stop / start switch of the elevator device 100. In this way, the safety protection module 11 can obtain stop / start information of the elevator device 100 and transmit it to the control module 14 via the bus line. The safety protection module 11 can be connected to a DC power supply of 24V, 36V, or 48V, and the specific voltage is not limited.

[0062] Those skilled in the art will understand that a traction machine is the power unit of an elevator, also known as the elevator main unit. Its function is to deliver and transmit power to operate the elevator. A traction machine can consist of a motor, brake, coupling, reduction gear, traction sheave, encoder, frame, guide pulley, and an attached handwheel.

[0063] Specifically, in the normal operating mode of the elevator device 100, the switch unit 131 is turned on, and the power supply AC can be connected to the drive unit 132 through the switch unit 131, so that the drive unit 132 is powered on. The control module 14 provides a control signal to the drive unit 132 through the safe torque off module 12, so that the drive unit 132 can drive the traction machine to operate according to the control signal, thereby realizing the operation of the elevator device 100. The control signal can be a pulse width modulation (PWM) signal, that is, the control module 14 provides a PWM signal to the drive unit 132 through the safe torque off module 12, so that the drive unit 132 can drive the traction machine to operate.

[0064] When the elevator equipment 100 stops normally, the control module 14 can stop outputting the control signal, and the safety protection module 11 can provide a shutdown signal to the safe torque shutdown module 12, so that the safe torque shutdown module 12 is shut down, and the control module 14 disconnects from the drive unit 132. After the safe torque shutdown module 12 is shut down, it can control the switch unit 131 to shut down, so that the power supply AC is disconnected from the drive unit 132, that is, when the working state of the safe torque shutdown module 12 is synchronized with the working state of the switch unit 131.

[0065] Furthermore, the control module 14 can generate a star-off command based on the status of the safety protection module 11 and the safe torque off module 12, that is, when the safety protection module 11 is normal and the safe torque off module 12 is off, and send it to the star-off control unit 133, so that the star-off control unit 133 is in an operational state. The star-off control unit 133 can control the drive unit 132 to short-circuit the U / V / W phases of the traction machine motor, thereby implementing the electronic star-off function. When the electronic star-off is in operation, to further ensure that the safe torque off module 12 is in the off state, the safety protection module 11 is also connected to the star-off control unit 133. When the star-off control unit 133 is in operation, the safety protection module 11 controls the safe torque off module 12 to be off.

[0066] In this way, the safe torque off and star-off control circuit 10 can double ensure that the safe torque off module 12 is disconnected during electronic star-off, avoiding the conflict between the safe torque off and the electronic star-off, and ensuring the safe operation of the elevator equipment 100.

[0067] In some embodiments, the safety protection module 11 is also used to send a star-sealing cancellation instruction to the control module 14 and the safe torque shutdown module 12. The control module 14 is also used to control the star-sealing control unit 133 to disconnect according to the star-sealing cancellation instruction, so that the drive unit 132 is disconnected and short-circuited with the traction machine; the safe torque shutdown module 12 is used to control the switch unit 131 to turn on according to the star-sealing cancellation instruction; the safety protection module 11 is also used to send a turn-on instruction to the safe torque shutdown module 12, so that the control module 14 is turned on with the drive unit 132 through the safe torque shutdown module 12.

[0068] In this embodiment, the operation steps of the safety torque off and star-sealing control circuit are shown before the elevator equipment 100 runs. Specifically, before the elevator equipment 100 runs, the safety protection module 11 can send a star-sealing cancellation instruction to the control module 14 and the safety torque off module 12 through the Bus line. After receiving the star-sealing cancellation instruction, the control module 14 controls the star-sealing control unit 133 to stop working and disconnect from the drive unit 132, so that the drive unit 132 is disconnected from the short-circuited state with the traction machine. After the star-sealing control unit 133 stops working, the safety protection module 11 generates a conduction instruction according to the state of the star-sealing control unit 133, thereby controlling the safety torque off module 12 to turn on, so that the safety torque off module 12 can control the switch unit 131 to turn on according to the star-sealing cancellation instruction, and the power supply AC can be connected to the drive unit 132 through the switch unit 131, and the control module 14 can be connected to the drive unit 132 through the safety torque off module 12. In this way, the control module 14 can subsequently provide a PWM signal to the drive unit 132 through the safe torque off module 12, and the drive unit 132 can drive the traction machine to operate, thereby achieving normal operation of the elevator equipment 100.

[0069] In some embodiments, the safe torque off module 12 is also used to disconnect the control module 14 from the drive unit 132 when the safety protection module 11 is disconnected; the control module 14 is also used to determine the traction machine speed based on the traction machine coding information of the elevator equipment 100, and generate a star-sealing instruction when the traction machine speed is less than the speed threshold, so that the star-sealing control unit 133 controls the drive unit 132 to short-circuit the traction machine according to the star-sealing instruction to achieve electronic star-sealing.

[0070] It should be noted that this embodiment shows the operation steps of the safety torque shutdown and star-off control circuit when the elevator equipment 100 stops suddenly due to a fault during operation or the safety protection module 11 is suddenly disconnected.

[0071] Specifically, when the elevator equipment fails, the safety protection module 11 will be disconnected. When the safety protection module 11 is shut down, the safe torque shutdown module 12 will disconnect the control module 14 from the drive unit 132, causing the control module 14 to stop outputting PWM signals to the drive unit 132. At the same time, when the safety protection module 11 is in the off state, the control module 14 obtains the encoder information of the traction machine and determines the current traction machine speed based on the encoder information to determine whether to enable the electronic star-blocking function. When the traction machine speed is less than the speed threshold, the star-blocking control unit 133 is controlled to operate, causing the drive unit 132 to short-circuit the U / V / W phases of the traction machine motor, thereby implementing the electronic star-blocking function.

[0072] In this way, damage to the drive unit 132 caused by the traction machine being shut down during high-speed operation is avoided, and a large inrush current is also avoided inside the traction machine, thereby ensuring the safety of the elevator device 100.

[0073] Please refer to Figure 2 or Figure 3. In some embodiments, the safe torque off module 12 includes a control switch K1 and a safe torque off controller 121, wherein the control switch K1 is connected to the control module 14, the safety protection module 11 and the drive unit 132, and is used to disconnect the control module 14 and the drive unit according to the shutdown signal of the safety protection module 11, so that the control module 14 stops sending the control signal to the drive unit 132; the safe torque off controller 121 is connected to the control module 14 and the switch unit 131, and is used to control the switch unit 131 to shut down when the control switch K1 is turned off.

[0074] Specifically, the control switch K1 can employ a redundant design. That is, the control switch K1 can include multiple control switches K1, each connected in series. This prevents damage to the drive unit 132 due to a failure of a single control switch K1. Upon receiving a shutdown signal from the safety protection module 11, the control switch K1 can disconnect the control module 14 from the drive unit 132, thereby preventing the control module 14 from providing a PWM signal to the drive unit 132, which would otherwise drive the traction machine. Upon receiving a turn-on signal from the safety protection module 11, the control switch K1 can turn on, allowing the control module 14 to communicate with the drive unit 132. This allows the control module 14 to provide a PWM signal to the drive unit 132, which in turn drives the traction machine.

[0075] The Safe Torque Off controller 121 can be connected to the control module 14 via a bus line and an I / O line. The Safe Torque Off controller 121 can exchange data with the control module 14 via the bus line and send the switch status of the Safe Torque Off module 12 to the control module 14 via the I / O line. The Safe Torque Off controller 121 can also be used to control the switch unit 131 to disconnect when the control switch K1 is turned off, thereby disconnecting the power supply AC from the drive unit 132.

[0076] In some embodiments, the drive unit 132 includes a driver 1321 and an insulated gate bipolar transistor (IGBT). The driver 1321 is connected to the control switch K1, the star-sealing control unit 133 and the insulated gate bipolar transistor IGBT. The driver 1321 is used to control the insulated gate bipolar transistor IGBT according to the control signal transmitted by the control module 14 to enable the traction machine to operate, and to short-circuit the insulated gate bipolar transistor IGBT and the traction machine according to the control instruction of the star-sealing control unit 133 to achieve electronic star-sealing.

[0077] It should be noted that the insulated gate bipolar transistor (IGBT) is a composite fully controlled voltage-driven power semiconductor device composed of a bipolar junction transistor (BJT) and an insulated gate field effect transistor (MOS), and is used to control the flow of current and changes in voltage.

[0078] The insulated gate bipolar transistor IGBT includes an upper bridge arm and a lower bridge arm. During electronic star sealing, the star sealing control unit 133 can only control the upper bridge arm to short-circuit the three-phase terminals U / V / W of the traction machine motor, so that the upper bridge arm is turned on in the electronic star sealing state, or the star sealing control unit 133 can only control the lower bridge arm to short-circuit the three-phase terminals U / V / W of the traction machine motor, so that the lower bridge arm is turned on in the electronic star sealing state, or the star sealing control unit 133 can control the lower bridge arm and the upper bridge arm to short-circuit the three-phase terminals U / V / W of the traction machine motor, so that the upper bridge arm and the lower bridge arm are turned on at the same time in the electronic star sealing state.

[0079] In this embodiment, the star sealing control unit 133 may include two, and the driver 1321 may be two, each star sealing control unit 133 is connected to a driver 1321, wherein the star sealing control unit 133 can control the lower bridge arm to short-circuit the three-phase terminal U / V / W of the motor of the traction machine, and the other star sealing control unit 133 can control the upper bridge arm to short-circuit the three-phase terminal U / V / W of the motor of the traction machine, so that the upper bridge arm and the lower bridge arm are turned on at the same time in the electronic star sealing state. It can be understood that when the upper bridge arm and the lower bridge arm are used to act on the electronic star sealing at the same time, it is equivalent to doubling the star sealing load capacity and improving the electronic star sealing current capacity at high speed of the traction machine. For example: the speed at which the star can be sealed is increased from the original 0.3m / s to 0.5~0.6m / s (or even higher speed), thereby improving the star sealing safety protection range.

[0080] Please refer to Figure 2. In some embodiments, the safety protection module 11 includes a safety controller 111, a first switch tube Q1, and a second switch tube Q2; wherein the safety controller 111 is connected to the control module 14 and the first switch tube Q1, and the safety controller 111 is used to control the first switch tube Q1 to output a shutdown signal when the elevator equipment 100 stops. The first pole of the first switch tube Q1 is connected to the power supply end DC, the second pole of the first switch tube Q1 is connected to the second switch tube Q2, and the control pole of the first switch tube Q1 is connected to the safety controller 111 and the control module 14; the first pole of the second switch tube Q2 is connected to the second pole of the first switch tube Q1, the second pole of the second switch tube Q2 is connected to the control switch K1, and the control pole of the second switch tube Q2 is connected to the star-sealing control unit 133.

[0081] It should be noted that the switching tubes used in this application can all be thin-film transistors, field-effect transistors, or other switching devices with the same characteristics. The source and drain of the switching tube used here can be symmetrical in structure, so the source and drain can be structurally indistinguishable. In the embodiments of the present disclosure, in order to distinguish the two poles of the switching tube other than the gate, one pole is directly described as the first pole and the other pole is directly described as the second pole, so the source and drain of all or part of the transistors in the embodiments of the present disclosure can be interchangeable as needed. The control pole is the gate of the switching tube.

[0082] It should also be noted that when the first switch tube Q1 and the second switch tube Q2 are turned on, the power supply end DC is connected to the control switch K1, and the control switch K1 is closed. When the first switch tube Q1 or the second switch tube Q2 is turned off, the power supply end DC is disconnected from the control switch K1, and the control switch K1 is turned off.

[0083] In this embodiment, if the elevator device 100 stops normally, the control module 14 can stop outputting the control signal, and the safety controller 111 controls the state of the first switch tube Q1 to turn off the control switch K1, so that the control module 14 cannot transmit the PWM signal to the drive unit 132 through the control switch K1, and the safety torque shutdown controller 121 After the control switch K1 is turned off, the switch unit 131 can be controlled to be turned off, so that the power supply AC is disconnected from the drive unit 132, so that the working state of the safety torque off module 12 is synchronized with the working state of the switch unit 131; the control module 14 can generate a star-sealing instruction and send it to the star-sealing control unit 133 when the first switch tube Q1 is turned off and the control switch K1 is turned off, so that the star-sealing control unit 133 is in an operating state. The star-sealing control unit 133 can control the drive unit 132 to short-circuit the U / V / W three-phases of the traction machine motor to realize the electronic star-sealing function. At the same time, the second switch tube Q2 is turned off when the star-sealing control unit 133 is working, so that the safety torque off module 12 is turned off when the electronic star-sealing is performed, thereby improving the independence of the two working modes of electronic star-sealing and safety torque off, and not causing conflict with each other, while also ensuring the mutually locked working logic.

[0084] If the elevator equipment 100 starts running, the safety controller 111 can send a star-sealing cancellation instruction to the control module 14 and the safe torque off controller 121. After receiving the star-sealing cancellation instruction, the control module 14 controls the star-sealing control unit 133 to stop working and disconnect from the drive unit 132, so that the drive unit 132 is disconnected from the traction machine. After the star-sealing control unit 133 stops working, the second switch tube Q2 is turned on. The safe torque off controller 121 can control the switch unit 131 to turn on according to the star-sealing cancellation instruction, so that the power supply AC can control the first switch tube Q1 to turn on. In this way, the power supply end DC is connected to the control switch K1 through the first switch tube Q1 and the second switch tube Q2. The control switch K1 is closed. In this way, the control module 14 can output a PWM signal to the drive unit 132 through the control switch K1, so that the drive unit 132 can drive the traction machine to operate, thereby achieving normal operation of the elevator equipment 100.

[0085] If an elevator device malfunctions, the safety controller 111 controls the first switch Q1 to turn off, disconnecting the power supply DC from the control switch K1. This disconnects the control module 14 from the drive unit 132, causing the control module 14 to stop outputting PWM signals to the drive unit 132. Simultaneously, the traction motor's brake loses power. The control module 14 obtains the traction motor's encoder information and determines the current traction motor speed based on the encoder information, thereby deciding whether to enable the electronic star-off function. When the traction motor speed is less than a speed threshold, the star-off control unit 133 is activated, causing the drive unit 132 to short-circuit the U / V / W phases of the traction motor, thereby enabling the electronic star-off function.

[0086] Please refer to Figure 3. In some embodiments, the safety protection module 11 includes a safety controller 111, a first switch tube Q1 and a buffer B1; the safety controller 111 is connected to the control module 14 and the first switch tube Q1, and is used to control the first switch tube Q1 to output a shutdown signal when the elevator equipment 100 stops. The first pole of the first switch tube Q1 is connected to the power supply end DC, the second pole of the first switch tube Q1 is connected to the control switch K1, and the control pole of the first switch tube Q1 is connected to the safety controller 111 and the control module 14. The buffer B1 is respectively connected to the control module 14, the control switch K1 and the star-sealing control unit 133, and is used to disconnect the control module 14 and the control switch K1 when the star-sealing control unit 133 is working.

[0087] It should be noted that when the first switch tube Q1 is turned on, the power supply terminal DC is connected to the control switch K1, and the control switch K1 is closed. When the first switch tube Q1 is turned off, the power supply terminal DC is disconnected from the control switch K1, and the control switch K1 is turned off.

[0088] In this embodiment, if the elevator equipment 100 stops normally, the control module 14 can stop outputting the control signal, and the safety controller 111 controls the state of the first switch tube Q1 to turn off the control switch K1, so that the control module 14 cannot transmit the PWM signal to the drive unit 132 through the control switch K1. After the control switch K1 is turned off, the safety torque off controller 121 can control the switch unit 131 to turn off, so that the power supply AC is disconnected from the drive unit 132, and the working state of the safety torque off module 12 is synchronized with the working state of the switch unit 131.

[0089] Furthermore, the control module 14 can generate a star-sealing instruction and send it to the star-sealing control unit 133 after the first switch tube Q1 is turned off and the control switch K1 is turned off, so that the star-sealing control unit 133 is in a working state. The star-sealing control unit 133 can control the drive unit 132 to short-circuit the U / V / W three-phases of the traction machine's motor to realize the electronic star-sealing function. At the same time, the power supply and enable signal of the buffer B1 remain disconnected when the star-sealing control unit 133 is working, so that the control module 14 cannot transmit the PWM signal to the drive unit 132. In this way, the safety torque shutdown module 12 is ensured to be shut down when electronic star-sealing is performed, which improves the independence of the two working modes of electronic star-sealing and safety torque shutdown, and does not cause mutual conflict, while also ensuring the mutually locked working logic.

[0090] If the elevator equipment 100 starts running, the safety controller 111 can send a star-sealing cancellation instruction to the control module 14 and the safety torque off controller 121. After receiving the star-sealing cancellation instruction, the control module 14 controls the star-sealing control unit 133 to stop working, so that the drive unit 132 is disconnected from the traction machine. The buffer B1 is turned on after the star-sealing control unit 133 stops working. The safety torque off controller 121 can control the switch unit 131 to turn on according to the star-sealing cancellation instruction; so that the power supply AC can control the first switch tube Q1 to turn on. In this way, the power supply end DC can be connected to the control switch K1 through the first switch tube Q1 and the second switch tube Q2. The control switch K1 is closed. In this way, the control module 14 can output a PWM signal to the drive unit 132 through the control switch K1, so that the drive unit 132 can drive the traction machine to operate, thereby realizing the normal operation of the elevator equipment 100.

[0091] If an elevator device malfunctions, the safety controller 111 controls the first switch Q1 to turn off, disconnecting the power supply DC from the control switch K1. This disconnects the control module 14 from the drive unit 132, causing the control module 14 to stop outputting PWM signals to the drive unit 132. Simultaneously, the traction motor's brake loses power. The control module 14 obtains the traction motor's encoder information and determines the current traction motor speed based on the encoder information, thereby deciding whether to enable the electronic star-off function. When the traction motor speed is less than a speed threshold, the star-off control unit 133 is activated, causing the drive unit 132 to short-circuit the U / V / W phases of the traction motor, thereby enabling the electronic star-off function.

[0092] In some embodiments, the switch unit 131 includes a third switch tube Q3, a first electrode of the third switch tube Q3 is connected to the power supply AC, a second electrode of the third switch tube Q3 is connected to the drive unit 132, and a control electrode of the third switch tube Q3 is connected to the safety torque off controller 121.

[0093] It should be noted that the third switch tube Q3 can be a transistor or a power switch. There can be two third switch tubes Q3, and the two third switch tubes Q3 are respectively located on two DC buses, which are connected to the power supply AC and are used to control the conduction and shutdown of the DC bus and the drive unit 132. When the safe torque off controller 121 provides a conduction signal to the control electrode of the third switch tube Q3,

[0094] In some embodiments, the frequency conversion module 13 further includes a rectifier unit 134 and a bus capacitor C1 , wherein the rectifier unit 134 is connected to the power source AC and the switch unit 131 , and the bus capacitor C1 is connected in parallel to the rectifier unit 134 .

[0095] It should be noted that the power supply AC is a three-phase AC input, which needs to be rectified by the rectifier unit 134 before supplying power to other components of the frequency conversion module 13. After the switch unit 131 is turned off, the AC input of the power supply AC is directly supplied to the bus capacitor C1 through the rectifier unit 134.

[0096] In some embodiments, the frequency conversion module 13 further includes a braking resistor R1 and a fourth switch tube Q4, wherein the braking resistor R1 is connected to the switch unit 131; the first pole of the fourth switch tube Q4 is connected to the braking resistor R1, and the second pole of the fourth switch tube Q4 is connected to the switch unit 131.

[0097] The embodiment of the present application also provides an elevator device 100, which includes the above-mentioned safe torque shutdown and star sealing control circuit 10 and a traction machine 30. The traction machine 30 is connected to the power supply AC through the safe torque shutdown and star sealing control circuit 10. The safe torque shutdown and star sealing control circuit 10 is used to realize electronic star sealing and safe torque shutdown of the traction machine 30.

[0098] In the elevator device 100 in the embodiment of the present application, the safety protection module 11 generates a shutdown signal when the elevator stops normally, thereby controlling the safety torque shutdown module 12 to shut down, so that the control module 14 stops sending a control signal to the drive unit 132, thereby realizing the safety torque shutdown function of the traction machine 30, and at the same time controls the switch unit 131 to disconnect the power supply AC from the drive unit 132 to prevent the power supply AC from supplying power to the drive unit 132. Then, the control module 14 generates a star-sealing instruction according to the status of the safety protection module 11 and the safety torque shutdown module 12, so that the star-sealing control unit 133 controls the drive unit 132 to short-circuit the traction machine 30 according to the star-sealing instruction to realize electronic star-sealing. In this way, the two working modes of electronic star-sealing and safety torque shutdown are independent and do not cause mutual conflict. At the same time, the mutually locked working logic is also guaranteed, thereby improving the safety performance of the elevator device 100. Moreover, compared with the related art, the response time of electronic star-off and safe torque shutdown is shortened, the operating efficiency of the safe torque shutdown and star-off control circuit 10 is improved, the noise of the electric control cabinet is reduced, and the performance of the elevator equipment 100 is further improved.

[0099] Throughout this specification, reference to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations 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 any one or more embodiments or examples.

[0100] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

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