Safety torque off and star-delta control circuit and elevator apparatus

Abstract

The application provides a safe torque off and star seal control circuit and an elevator device. The safe torque off and star seal control circuit comprises a safety protection module, a safe torque off module, a variable frequency module and a control module, the variable frequency module comprises a switch unit, a drive unit and a star seal control unit, the safety protection module is used for generating an off signal in the case of elevator device stopping, failure or disconnection of the safety protection module; the safe torque off module is used for being turned off according to the off signal, so that the control module is disconnected with the drive unit, and the switch unit is controlled to be turned off according to the off signal; the control module is used for generating a star seal instruction according to the state of the safety protection module and the safe torque off module, so that the star seal control unit controls the drive unit to be short-circuited with a traction machine to realize electronic star seal. In this way, the normal safe torque off and electronic star seal of the elevator device are ensured.

Description

Technical Field

[0001] This application relates to the field of elevator technology, and in particular to a safety torque shutdown and star-sealing control circuit and elevator equipment. Background Technology

[0002] In applications such as motor drives and elevator control, the requirements for system safety are becoming increasingly stringent. Safe Torque Off (STO) and star-locking have become essential safety functions. Currently, conventional elevator electrical control designs achieve safe torque off and star-locking through a main contactor between the frequency converter module and the motor, or by incorporating both a main contactor and a star-locking contactor on the input side of the frequency converter module. However, as elevator power increases, the cost of contactors also rises. Furthermore, contactors generate significant noise with each operation, resulting in a poor elevator passenger experience.

[0003] In related technologies, an STO + electronic star-sealing scheme (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 achieve safe torque turn-off and star-sealing. However, STO and electronic star-sealing have the risk of short circuits in logic control, which may cause damage to the IGBT. Summary of the Invention

[0004] Embodiments of this application provide a safe torque shutdown and star-sealing control circuit and elevator equipment.

[0005] The safety torque shutdown and sealing control circuit of this application is used in elevator equipment. The safety torque shutdown and sealing control circuit includes a safety protection module, a safety torque shutdown module, a frequency conversion module and a control module. The frequency conversion module includes a switching unit, a drive unit and a sealing control unit. The switching unit is connected to a power supply, and the drive unit is connected to the switching unit, the sealing control unit and the traction machine of the elevator equipment.

[0006] The safety protection module is connected to the safety torque shutdown module and is used to generate a shutdown signal when the elevator stops, malfunctions, or the safety protection module is disconnected.

[0007] The safety torque shutdown module is connected to the control module, the switching unit and the drive unit, and is used to shut down according to the shutdown signal, so that the control module stops sending control signals to the drive unit, and to control the switching unit to shut down according to the shutdown signal;

[0008] The control module is also connected to the safety protection module and is used to generate a sealing command based on the status of the safety protection module and the safety torque shutdown module, so that the sealing control unit controls the drive unit to short-circuit with the traction machine according to the sealing command to achieve electronic sealing.

[0009] In some implementations, the safety protection module is also used to send a star-blocking cancellation command to the control module and the safety torque shutdown module;

[0010] The control module is also used to control the star-sealing control unit to disconnect according to the star-sealing cancellation command, so that the drive unit is disconnected from the traction machine;

[0011] The safety torque shutdown module is used to control the switching unit to conduct according to the star-sealing cancellation command;

[0012] The safety protection module is also used to send a conduction command to the safety torque shutdown module, so that the control module can conduct to the drive unit through the safety torque shutdown module.

[0013] In some embodiments, the safety torque shutdown module is further configured to disconnect the control module from the drive unit in the event that the safety protection module is disconnected;

[0014] The control module is also used to determine the speed of the traction machine based on the traction machine coding information of the elevator equipment, and generate a sealing command when the traction machine speed is less than a speed threshold, so that the sealing control unit controls the drive unit to short-circuit with the traction machine according to the sealing command to realize electronic sealing.

[0015] In some embodiments, the safety torque shutdown module includes:

[0016] A control switch, connecting the control module, the safety protection module, and the drive unit, is used to disconnect the control module from the drive unit according to the shutdown signal of the safety protection module, so that the control module stops sending control signals to the drive unit;

[0017] A safety torque shutdown controller, connected to the control module and the switching unit, is used to control the switching unit to shut down when the control switch is off.

[0018] In some embodiments, the driving unit includes a driver and an insulated gate bipolar transistor;

[0019] The driver connects the control switch, the star-sealing control unit, and the insulated gate bipolar transistor (IGBT), and is used to control the IGBT according to the control signal transmitted by the control module to make the traction machine run, and to short-circuit the IGBT with the traction machine according to the control command of the star-sealing control unit to realize electronic star sealing.

[0020] In some embodiments, the insulated gate bipolar transistor includes an upper arm and a lower arm, which are simultaneously turned on in an electronically sealed state.

[0021] In some embodiments, the safety protection module includes a safety controller, a first switch, and a second switch;

[0022] 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.

[0023] The first terminal of the first switching transistor is connected to the power supply terminal, the second terminal is connected to the second switching transistor, and the control terminal is connected to the safety controller and the control module.

[0024] The first terminal of the second switching transistor is connected to the second terminal of the first switching transistor, the second terminal is connected to the control switch, and the control terminal is connected to the sealing control unit.

[0025] In some embodiments, the safety protection module includes a safety controller, a first switching transistor, and a buffer;

[0026] 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.

[0027] The first terminal of the first switching transistor is connected to the power supply terminal, the second terminal is connected to the control switch, and the control terminal is connected to the safety controller and the control module.

[0028] The buffer is connected to the control module, the control switch and the star-sealing control unit respectively, and is used to disconnect the control module and the control switch when the star-sealing control unit is working.

[0029] In some embodiments, the switching unit includes:

[0030] The third switching transistor has its first terminal connected to the power supply, its second terminal connected to the drive unit, and its control terminal connected to the safety torque shutdown controller.

[0031] In some embodiments, the frequency converter module further includes:

[0032] The rectifier unit is connected to the power supply and the switching unit;

[0033] The bus capacitor is connected in parallel with the rectifier unit.

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

[0035] A braking resistor is connected to the switching unit;

[0036] The fourth switching transistor has its first terminal connected to the braking resistor and its second terminal connected to the switching unit.

[0037] The elevator equipment according to the embodiments of this application includes a traction machine and the aforementioned safety torque shutdown and star-locking control circuit.

[0038] In the safety torque shutdown and star-locking control circuit and elevator equipment of this application, the safety protection module generates a shutdown signal when the elevator is normally stopped, thereby controlling the safety torque shutdown module to shut down. This causes the control module to stop sending control signals to the drive unit, realizing the safety torque shutdown function of the traction machine. At the same time, the control switch unit disconnects the power supply from the drive unit to prevent the power supply from supplying power to the drive unit. Then, the control module generates a star-locking command based on the status of the safety protection module and the safety torque shutdown module, so that the star-locking control unit controls the drive unit to short-circuit with the traction machine according to the star-locking command to realize electronic star-locking. In this way, it is ensured that the electronic star-locking and safety torque shutdown working modes are independent and do not conflict with each other. At the same time, it also ensures the interlocking working logic and avoids the risk to the drive unit caused by the simultaneous operation of electronic star-locking and safety torque shutdown.

[0039] Additional aspects and advantages of the embodiments of this application 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 this application. Attached Figure Description

[0040] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0041] Figure 1 This is a schematic diagram of the safe torque shutdown and star-sealing control circuit in some embodiments of this application;

[0042] Figure 2 This is a circuit diagram of the safety torque shutdown and star-sealing control circuit in some embodiments of this application;

[0043] Figure 3 This is a circuit diagram of the safety torque shutdown and star-sealing control circuit in some embodiments of this application;

[0044] Figure 4 This is a schematic diagram of the elevator equipment according to certain embodiments of this application.

[0045] Explanation of key component symbols:

[0046] 100-Elevator equipment, 10-Safety torque shutdown and star-sealing control circuit, 11-Safety protection module, 111-Safety controller, Q1-First switch, Q2-Second switch, B1-Buffer, 12-Safety torque shutdown module, K1-Control switch, 121-Safety torque shutdown controller, 13-Variable frequency module, 131-Switch unit, Q3-Third switch, 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, 14-Control module, AC-Power supply, DC-Power supply terminal, Traction machine 30. Detailed Implementation

[0047] The embodiments of this application 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 application, and should not be construed as limiting this application.

[0048] 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 construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] The following disclosure provides many different implementations or examples for carrying out different circuits of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0051] In applications such as motor drives and elevator control, the requirements for system safety are becoming increasingly stringent. Among these, Safe Torque Off (STO) and Star Sealing have become essential safety functions. Currently, conventional elevator electrical control designs achieve Safe Torque Off and Star Sealing through a main contactor between the frequency converter module and the motor, or by incorporating a main contactor and a Star Sealing contactor on the input side of the frequency converter module.

[0052] As competition intensifies and elevator power ratings increase, the cost of contactors also rises. Furthermore, contactors generate significant noise with each operation, resulting in a poor elevator passenger experience. Therefore, low-cost, compact STO (Safe Torque Off) solutions (such as functional safety devices or safety circuit devices) are attracting increasing attention. STO solutions utilize the motor controller to shut off the inverter arm drive signal (by cutting off the drive signal power supply and / or locking the drive signal output) to achieve the safe torque off function.

[0053] In related technologies, an STO + electronic star-sealing scheme (i.e., IGBT as the electronic star-sealing execution unit) can be used to replace the star-sealing contactor and main contactor to achieve safe torque shutdown and star-sealing. However, when implementing the safe torque shutdown function, it is usually necessary to shut down the drive signal output of the inverter bridge arm. But when implementing the star-sealing function, it is necessary to turn on the upper three devices or lower three devices of the three-phase inverter bridge arm. Therefore, the implementation of the star-sealing function conflicts with the aforementioned safe torque shutdown function, which can easily cause IGBT damage. There is also the risk that the IGBT will be affected by the star-sealing current in the electronic star-sealing mode, resulting in insufficient capacity during long-term operation, or functional failure of the IGBT due to temperature rise.

[0054] In view of this, please refer to Figure 1 This application provides a safety torque shutdown and star-sealing control circuit 10 for elevator equipment. The safety torque shutdown and star-sealing control circuit 10 includes a safety protection module 11, a safety torque shutdown module 12, a frequency converter module 13, and a control module 14. The frequency converter module 13 includes a switching unit 131, a drive unit 132, and a star-sealing control unit 133. The switching unit 131 is connected to the AC power supply, and the drive unit 132 is connected to the switching unit 131, the star-sealing control unit 133, and the traction machine of the elevator equipment 100.

[0055] Safety protection module 11 is connected to safety torque shutdown module 12. Safety protection module 11 is used to generate shutdown signal when elevator equipment 100 stops, malfunctions, or safety protection module 11 is disconnected. Safety torque shutdown module 12 is connected to control module 14, switch unit 131, and drive unit 132. Safety torque shutdown module 12 is used to shut down according to shutdown signal, so that control module 14 stops sending control signal to drive unit 132, and controls switch unit 131 to shut down according to shutdown signal. Control module 14 is also connected to safety protection module 11. Control module 14 is used to generate sealing command according to the status of safety protection module 11 and safety torque shutdown module 12, so that sealing control unit 133 controls drive unit 132 to short-circuit with traction machine according to sealing command to realize electronic sealing.

[0056] In the safety torque shutdown and star-sealing control circuit 10 of this application embodiment, the safety protection module 11 generates a shutdown signal when the elevator equipment stops normally, malfunctions, or the safety protection module 11 is disconnected, thereby controlling the safety torque shutdown module 12 to shut down. This causes the control module 14 to stop sending control signals to the drive unit 132, realizing the safety torque shutdown function of the traction machine. At the same time, the control switch unit 131 disconnects the AC power supply from the drive unit 132 to prevent the AC power supply from supplying power to the drive unit 132. Then, the control module 14 generates a star-sealing command based on 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 with the traction machine according to the star-sealing command to realize electronic star-sealing. In this way, it is ensured that the two working modes of electronic star-sealing and safety torque shutdown are independent and do not conflict with each other. At the same time, it also ensures the interlocking working logic and avoids the risk to the drive unit caused by the simultaneous operation of electronic star-sealing and safety torque shutdown. Furthermore, compared to related technologies, the response time of electronic star-sealing and safety torque shutdown is shortened, the operating efficiency of the safety torque shutdown and star-sealing control circuit 10 is improved, and noise is reduced, thereby further enhancing the performance of the elevator equipment 100.

[0057] It should be noted that the AC power supply can be three-phase. In the normal operation mode of the elevator, the safety protection module 11, the safety torque shutdown module 12, and the control module 14 can exchange data via the bus protocol (Bus). Furthermore, the control module 14 can also be connected to the safety torque shutdown module 12 via I / O lines, thereby obtaining the status of the safety torque shutdown module 12.

[0058] It should also be noted that the safety protection module 11 can acquire the operating signals of the elevator equipment 100. For example, the safety protection module 11 can be connected to the start / stop switch of the elevator equipment 100. In this way, the safety protection module 11 can acquire the start / stop information of the elevator equipment 100 and transmit it to the control module 14 via the bus line. The safety protection module 11 can be connected to DC power of 24V, 36V, or 48V, etc., with no specific voltage limit.

[0059] As will be understood by those skilled in the art, a traction machine is the power unit of an elevator, also known as the elevator main unit. The function of the traction machine is to deliver and transmit power to make the elevator run. A traction machine can be composed of a motor, brake, coupling, gearbox, traction sheave, encoder, frame, guide wheels, and auxiliary handwheel, etc.

[0060] Specifically, in the normal operating mode of the elevator equipment 100, the switch unit 131 is turned on, and the AC power supply can be connected to the drive unit 132 through the switch unit 131, thus powering on the drive unit 132. The control module 14 can provide a control signal to the drive unit 132 through the safety torque shutdown module 12, so that the drive unit 132 can drive the traction machine to run according to the control signal, thereby realizing the operation of the elevator equipment 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 safety torque shutdown module 12, enabling the drive unit 132 to drive the traction machine.

[0061] When the elevator equipment 100 stops normally, the control module 14 can stop outputting control signals, and the safety protection module 11 can provide a shutdown signal to the safety torque shutdown module 12, causing the safety torque shutdown module 12 to shut down. The control module 14 disconnects from the drive unit 132. After shutting down, the safety torque shutdown module 12 can control the switch unit 131 to shut down, causing the AC power supply to disconnect from the drive unit 132. That is, the working state of the safety torque shutdown module 12 is synchronized with the working state of the switch unit 131.

[0062] Furthermore, the control module 14 can generate a star-sealing command and send it to the star-sealing control unit 133 based on the status of the safety protection module 11 and the safety torque shutdown module 12, i.e., when the safety protection module 11 is normal and the safety torque shutdown module 12 is off. This causes the star-sealing control unit 133 to be in 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 motor, realizing the electronic star-sealing function. During electronic star-sealing, in order to further ensure that the safety torque shutdown module 12 is in the off state, the safety protection module 11 is also connected to the star-sealing control unit 133. When the star-sealing control unit 133 is working, the safety protection module 11 controls and ensures that the safety torque shutdown module 12 is turned off.

[0063] In this way, the safety torque shutdown and star-sealing control circuit 10 can double ensure that the safety torque shutdown module 12 is disconnected when the electronic star-sealing is activated, thus avoiding the conflict between the safety torque shutdown and the electronic star-sealing and ensuring the safe operation of the elevator equipment 100.

[0064] In some embodiments, the safety protection module 11 is further configured to send a star-sealing cancellation command to the control module 14 and the safety torque shutdown module 12. The control module 14 is further configured to control the star-sealing control unit 133 to disconnect according to the star-sealing cancellation command, so that the drive unit 132 is disconnected from the traction machine. The safety torque shutdown module 12 is configured to control the switch unit 131 to conduct according to the star-sealing cancellation command. The safety protection module 11 is further configured to send a conduction command to the safety torque shutdown module 12, so that the control module 14 is connected to the drive unit 132 through the safety torque shutdown module 12.

[0065] This embodiment describes the operation steps of the safety torque shutdown and star-sealing control circuit before the elevator equipment 100 starts running. Specifically, before the elevator equipment 100 starts running, the safety protection module 11 can send a star-sealing cancellation command to the control module 14 and the safety torque shutdown module 12 via the Bus line. After receiving the star-sealing cancellation command, 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 safety protection module 11 generates a conduction command according to the state of the star-sealing control unit 133, thereby controlling the safety torque shutdown module 12 to conduct, so that the safety torque shutdown module 12 can control the switch unit 131 to conduct according to the star-sealing cancellation command. The AC power supply 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 shutdown module 12. In this way, the control module 14 can provide a PWM signal to the drive unit 132 through the safety torque shutdown module 12, and the drive unit 132 can drive the traction machine to run, so as to realize the normal operation of the elevator equipment 100.

[0066] In some embodiments, the safety torque shutdown module 12 is also used to disconnect the connection between the control module 14 and 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 according to the traction machine coding information of the elevator equipment 100, and generate a sealing command when the traction machine speed is less than the speed threshold, so that the sealing control unit 133 controls the drive unit 132 to short-circuit with the traction machine according to the sealing command to realize electronic sealing.

[0067] It should be noted that this embodiment describes the operation steps of the safety torque shutdown and star-sealing control circuit when the elevator equipment 100 stops urgently due to a malfunction or when the safety protection module 11 suddenly disconnects during operation.

[0068] Specifically, when the elevator equipment malfunctions, the safety protection module 11 will disconnect. When the safety protection module 11 is off, the safety 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 off, the control module 14 acquires the encoder information of the traction machine and determines the current speed of the traction machine based on the encoder information, thereby deciding whether to activate the electronic star-sealing function. When the speed of the traction machine is less than the speed threshold, the control unit 133 is activated, causing the drive unit 132 to short-circuit the U / V / W three phases of the traction machine motor, thus realizing the electronic star-sealing function.

[0069] This avoids damage to the drive unit 132 caused by the traction machine shutting down during high-speed operation, and also avoids large inrush currents inside the traction machine, ensuring the safety of the elevator equipment 100.

[0070] Please combine Figure 2 or Figure 3 In some embodiments, the safety torque shutdown module 12 includes a control switch K1 and a safety torque shutdown controller 121. 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 control signals to the drive unit 132. The safety torque shutdown 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.

[0071] Specifically, the control switch K1 can adopt a redundant design, that is, multiple control switches K1 can be included, and multiple control switches K1 are connected in series. In this way, the failure of a single control switch K1 can prevent the drive unit 132 from being damaged. When the control switch K1 receives the shutdown signal from the safety protection module 11, it can disconnect the connection between the control module 14 and the drive unit 132, thereby preventing the control module 14 from providing a PWM signal to the drive unit 132 to drive the traction machine. When the control switch K1 receives the conduction signal from the safety protection module 11, it conducts, allowing the control module 14 to connect with the drive unit 132. In this way, the control module 14 can provide a PWM signal to the drive unit 132 to drive the traction machine.

[0072] The safety torque shutdown controller 121 can be connected to the control module 14 via a bus line and an I / O line. The safety torque shutdown controller 121 can interact with the control module 14 via the bus line and send the switching status of the safety torque shutdown module 12 to the control module 14 via the I / O line. The safety torque shutdown controller 121 can also be used to disconnect the control switch unit 131 when the control switch K1 is turned off, thereby disconnecting the power supply AC from the drive unit 132.

[0073] 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 IGBT. The driver 1321 is used to control the IGBT according to the control signal transmitted by the control module 14 to make the traction machine run, and to short-circuit the IGBT with the traction machine according to the control command of the star sealing control unit 133 to realize electronic star sealing.

[0074] It should be noted that the Insulated Gate Bipolar Transistor (IGBT) is a composite fully controllable voltage-driven power semiconductor device composed of a Bipolar Junction Transistor (BJT) and an Insulated Gate Semiconductor (MOS), used to control the flow of current and changes in voltage.

[0075] The Insulated Gate Bipolar Transistor (IGBT) includes an upper arm and a lower arm. During electronic star-sealing, the star-sealing control unit 133 can control only the upper arm to short-circuit the three-phase terminals U / V / W of the traction machine motor, so that the upper arm is turned on in the electronic star-sealing state. Alternatively, the star-sealing control unit 133 can control only the lower arm to short-circuit the three-phase terminals U / V / W of the traction machine motor, so that the lower arm is turned on in the electronic star-sealing state. Or, the star-sealing control unit 133 can control both the lower arm and the upper arm to short-circuit the three-phase terminals U / V / W of the traction machine motor, so that both the upper arm and the lower arm are turned on simultaneously in the electronic star-sealing state.

[0076] In this embodiment, the star-sealing control unit 133 may include two units, and the driver 1321 may also include two units. Each star-sealing control unit 133 is connected to one driver 1321. The star-sealing control unit 133 can control the lower bridge arm to short-circuit the three-phase terminals U / V / W of the traction machine motor, and the other star-sealing control unit 133 can control the upper bridge arm to short-circuit the three-phase terminals U / V / W of the traction machine motor, so that the upper and lower bridge arms are simultaneously conducting in the electronic star-sealing state. It can be understood that when the upper and lower bridge arms act simultaneously on the electronic star-sealing, it is equivalent to doubling the star-sealing load capacity and improving the current-connecting capacity of the electronic star-sealing at high speeds of the traction machine. For example, the star-sealing speed can be increased from the original 0.3m / s to 0.5~0.6m / s (or even higher speeds), thereby improving the star-sealing safety protection range.

[0077] Please combine Figure 2 In some embodiments, the safety protection module 11 includes a safety controller 111, a first switch Q1, and a second switch Q2. The safety controller 111 is connected to the control module 14 and the first switch Q1. The safety controller 111 is used to control the first switch Q1 to output a shutdown signal when the elevator equipment 100 stops. The first terminal of the first switch Q1 is connected to the power supply terminal DC, the second terminal of the first switch Q1 is connected to the second switch Q2, and the control terminal of the first switch Q1 is connected to the safety controller 111 and the control module 14. The first terminal of the second switch Q2 is connected to the second terminal of the first switch Q1, the second terminal of the second switch Q2 is connected to the control switch K1, and the control terminal of the second switch Q2 is connected to the sealing control unit 133.

[0078] It should be noted that the switching transistors 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 transistors used here can be structurally symmetrical, so their structures can be indistinguishable. In the embodiments of this disclosure, to distinguish the two terminals of the switching transistor other than the gate, one terminal is directly described as the first terminal and the other as the second terminal. Therefore, in the embodiments of this disclosure, the source and drain of all or some transistors can be interchanged as needed. The control terminal is the gate of the switching transistor.

[0079] It should also be noted that when the first switch Q1 and the second switch Q2 are 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 Q1 or the second switch Q2 is turned off, the power supply terminal DC is disconnected from the control switch K1, and the control switch K1 is turned off.

[0080] In this embodiment, if the elevator equipment 100 stops normally, the control module 14 can stop outputting control signals. The safety controller 111 controls the state of the first switching transistor Q1, causing the control switch K1 to turn off, preventing the control module 14 from transmitting PWM signals to the drive unit 132 through the control switch K1. After the control switch K1 is turned off, the safety torque shutdown controller 121 can control the switch unit 131 to turn off, disconnecting the power supply AC from the drive unit 132, thereby synchronizing the working state of the safety torque shutdown module 12 with the working state of the switch unit 131. The control module 14 can, in the first When switch Q1 and control switch K1 are turned off, a star-sealing command is generated and sent to the star-sealing control unit 133, causing the star-sealing control unit 133 to be in 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 motor to realize the electronic star-sealing function. At the same time, the second switch Q2 is turned off when the star-sealing control unit 133 is working. In this way, the safety torque shutdown module 12 is turned off when electronic star-sealing is performed, which improves the independence of the two working modes of electronic star-sealing and safety torque shutdown and prevents mutual conflict. At the same time, it also ensures the interlocking working logic.

[0081] If the elevator equipment 100 starts running, the safety controller 111 can send a star-locking cancellation command to the control module 14 and the safety torque shutdown controller 121. After receiving the star-locking cancellation command, the control module 14 controls the star-locking 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. The second switch Q2 turns on after the star-locking control unit 133 stops working. The safety torque shutdown controller 121 can control the switch unit 131 to turn on according to the star-locking cancellation command, so that the AC power supply can control the first switch Q1 to turn on. In this way, the DC power supply can be connected to the control switch K1 through the first switch Q1 and the second switch 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 run, realizing the normal operation of the elevator equipment 100.

[0082] If the elevator equipment malfunctions, the safety controller 111 will control the first switch Q1 to turn off, causing the DC power supply to disconnect the control switch K1. With control switch K1 off, the control module 14 will disconnect from the drive unit 132, causing the control module 14 to stop outputting PWM signals to the drive unit 132. Simultaneously, the traction machine's brake will lose power. The control module 14 can obtain the encoder information of the traction machine and determine the current traction machine speed based on this information, thereby deciding whether to activate the electronic star-sealing function. When the traction machine speed is less than the speed threshold, the star-sealing control unit 133 will operate, causing the drive unit 132 to short-circuit the U / V / W phases of the traction machine's motor, thus realizing the electronic star-sealing function.

[0083] Please combine Figure 3 In some embodiments, the safety protection module 11 includes a safety controller 111, a first switch Q1, and a buffer B1. The safety controller 111 is connected to the control module 14 and the first switch Q1, and is used to control the first switch Q1 to output a shutdown signal when the elevator equipment 100 stops. The first pole of the first switch Q1 is connected to the power supply terminal DC, the second pole of the first switch Q1 is connected to the control switch K1, and the control pole of the first switch Q1 is connected to the safety controller 111 and the control module 14. The buffer B1 is connected to the control module 14, the control switch K1, and the sealing control unit 133, and is used to disconnect the control module 14 and the control switch K1 when the sealing control unit 133 is working.

[0084] It should be noted that when the first switch 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 Q1 is turned off, the power supply terminal DC is disconnected from the control switch K1, and the control switch K1 is turned off.

[0085] In this embodiment, if the elevator equipment 100 stops normally, the control module 14 can stop outputting control signals. The safety controller 111 controls the state of the first switch Q1 to turn off the control switch K1, so that the control module 14 cannot transmit PWM signals to the drive unit 132 through the control switch K1. After the control switch K1 is turned off, the safety torque shutdown controller 121 can control the switch unit 131 to turn off, so that the power supply AC is disconnected from the drive unit 132. The working state of the safety torque shutdown module 12 is synchronized with the working state of the switch unit 131.

[0086] Furthermore, after the first switch Q1 is turned off and the control switch K1 is turned off, the control module 14 generates a star-sealing command and sends it to the star-sealing control unit 133, so that the star-sealing control unit 133 is in 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 motor to realize the electronic star-sealing function. At the same time, the power supply and enable signal of the buffer B1 are kept disconnected when the star-sealing control unit 133 is working, so that the control module 14 cannot transmit PWM signals to the drive unit 132. In this way, the safety torque shutdown module 12 is turned off when electronic star-sealing is performed, which improves the independence of the two working modes of electronic star-sealing and safety torque shutdown and prevents mutual conflict, while also ensuring the interlocking working logic.

[0087] If the elevator equipment 100 starts running, the safety controller 111 can send a star-locking cancellation command to the control module 14 and the safety torque shutdown controller 121. After receiving the star-locking cancellation command, the control module 14 controls the star-locking 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-locking control unit 133 stops working. The safety torque shutdown controller 121 can control the switch unit 131 to turn on according to the star-locking cancellation command. This allows the AC power supply to control the first switch Q1 to turn on. In this way, the DC power supply can be connected to the control switch K1 through the first switch Q1 and the second switch Q2. The control switch K1 is closed. Thus, 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 run, realizing the normal operation of the elevator equipment 100.

[0088] If the elevator equipment malfunctions, the safety controller 111 will control the first switch Q1 to turn off, causing the DC power supply to disconnect the control switch K1. With control switch K1 off, the control module 14 will disconnect from the drive unit 132, causing the control module 14 to stop outputting PWM signals to the drive unit 132. Simultaneously, the traction machine's brake will lose power. The control module 14 can obtain the encoder information of the traction machine and determine the current traction machine speed based on this information, thereby deciding whether to activate the electronic star-sealing function. When the traction machine speed is less than the speed threshold, the star-sealing control unit 133 will operate, causing the drive unit 132 to short-circuit the U / V / W phases of the traction machine's motor, thus realizing the electronic star-sealing function.

[0089] In some embodiments, the switching unit 131 includes a third switching transistor Q3, the first terminal of the third switching transistor Q3 is connected to the power supply AC, the second terminal of the third switching transistor Q3 is connected to the drive unit 132, and the control terminal of the third switching transistor Q3 is connected to the safety torque shutdown controller 121.

[0090] It should be noted that the third switch Q3 can be a transistor or a power switch. There can be two third switches Q3, each located on a separate DC bus connected to the AC power supply, used to control the switching on and off of the DC bus and the drive unit 132. The safety torque shutdown controller 121 provides conduction to the control terminal of the third switch Q3.

[0091] In some embodiments, the frequency converter module 13 further includes a rectifier unit 134 and a bus capacitor C1, wherein the rectifier unit 134 is connected to the power supply AC and the switching unit 131, and the bus capacitor C1 is connected in parallel with the rectifier unit 134.

[0092] It should be noted that the AC power supply 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 converter module 13. After the switch unit 131 is turned off, the AC power input of the AC power supply is directly supplied to the bus capacitor C1 through the rectifier unit 134.

[0093] In some embodiments, the frequency converter module 13 further includes a braking resistor R1 and a fourth switching transistor Q4, wherein the braking resistor R1 is connected to the switching unit 131; the first terminal of the fourth switching transistor Q4 is connected to the braking resistor R1, and the second terminal of the fourth switching transistor Q4 is connected to the switching unit 131.

[0094] This application also provides an elevator device 100, which includes the aforementioned safety torque shutdown and star-locking control circuit 10 and a traction machine 30. The traction machine 30 is connected to a power supply AC through the safety torque shutdown and star-locking control circuit 10. The safety torque shutdown and star-locking control circuit 10 is used to realize the electronic star-locking and safety torque shutdown of the traction machine 30.

[0095] In the elevator equipment 100 of this application embodiment, the safety protection module 11 generates a shutdown signal when the elevator is normally stopped, thereby controlling the safety torque shutdown module 12 to shut down. This causes the control module 14 to stop sending control signals to the drive unit 132, realizing the safety torque shutdown function of the traction machine 30. At the same time, the control switch unit 131 disconnects the AC power supply from the drive unit 132 to prevent the AC power supply from supplying power to the drive unit 132. Then, the control module 14 generates a sealing command based on the status of the safety protection module 11 and the safety torque shutdown module 12, so that the sealing control unit 133 controls the drive unit 132 to short-circuit with the traction machine 30 according to the sealing command to realize electronic sealing. In this way, the two working modes of electronic sealing and safety torque shutdown are independent and do not conflict with each other. At the same time, the interlocking working logic is also guaranteed, improving the safety performance of the elevator equipment 100. Furthermore, compared to related technologies, the response time of electronic star-sealing and safety torque shutdown is shortened, the operating efficiency of the safety torque shutdown and star-sealing control circuit 10 is improved, the noise of the electrical control cabinet is reduced, and the performance of the elevator equipment 100 is further improved.

[0096] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. 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.

[0097] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A safety torque shutdown and star-locking control circuit for elevator equipment, characterized in that, It includes a safety protection module, a safety torque shutdown module, a frequency conversion module, and a control module. The frequency conversion module includes a switching unit, a drive unit, and a sealing star control unit. The switching unit is connected to the power supply, and the drive unit is connected to the switching unit, the sealing star control unit, and the traction machine of the elevator equipment. The safety protection module is connected to the safety torque shutdown module and is used to generate a shutdown signal when the elevator stops, malfunctions, or the safety protection module is disconnected. The safety torque shutdown module is connected to the control module, the switching unit, and the drive unit, and is used to shut down according to the shutdown signal, so that the control module disconnects from the drive unit, and to control the switching unit to shut down according to the shutdown signal. The control module is also connected to the safety protection module and is used to generate a star-sealing command based on the status of the safety protection module and the safety torque shutdown module, so that the star-sealing control unit controls the drive unit to short-circuit with the traction machine according to the star-sealing command to achieve electronic star-sealing; the safety torque shutdown module is also used to disconnect the connection between the control module and the drive unit when the safety protection module is disconnected; The control module is also connected to the traction machine and is used to determine the speed of the traction machine according to the traction machine coding information of the elevator equipment, and generate a sealing command when the traction machine speed is less than the speed threshold, so that the sealing control unit controls the drive unit to short-circuit with the traction machine according to the sealing command to realize electronic sealing.

2. The safety torque shutdown and star-sealing control circuit according to claim 1, characterized in that, The safety protection module is also used to send a star-blocking cancellation command to the control module and the safety torque shutdown module; The control module is also used to control the star-sealing control unit to disconnect according to the star-sealing cancellation command, so that the drive unit is disconnected from the traction machine; The safety torque shutdown module is used to control the switching unit to conduct according to the star-sealing cancellation command; The safety protection module is also used to send a conduction command to the safety torque shutdown module, so that the control module can conduct to the drive unit through the safety torque shutdown module.

3. The safety torque shutdown and star-sealing control circuit according to any one of claims 1-2, characterized in that, The safety torque shutdown module includes: A control switch, connecting the control module, the safety protection module, and the drive unit, is used to disconnect the control module from the drive unit according to the shutdown signal of the safety protection module, so that the control module stops sending control signals to the drive unit; A safety torque shutdown controller, connected to the control module and the switching unit, is used to control the switching unit to shut down when the control switch is off.

4. The safety torque shutdown and star-sealing control circuit according to claim 3, characterized in that, The driving unit includes a driver and an insulated gate bipolar transistor; The driver connects the control switch, the star-sealing control unit, and the insulated gate bipolar transistor (IGBT), and is used to control the IGBT according to the control signal transmitted by the control module to make the traction machine run, and to short-circuit the IGBT with the traction machine according to the control command of the star-sealing control unit to realize electronic star sealing.

5. The safety torque shutdown and star-sealing control circuit according to claim 4, characterized in that, The insulated gate bipolar transistor includes an upper bridge arm and a lower bridge arm, which are simultaneously turned on in an electronically sealed state.

6. The safe torque shutdown and star-sealing control circuit according to claim 3, characterized in that, The safety protection module includes a safety controller, a first switch, and a second switch. 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. The first terminal of the first switching transistor is connected to the power supply terminal, the second terminal is connected to the second switching transistor, and the control terminal is connected to the safety controller and the control module. The first terminal of the second switching transistor is connected to the second terminal of the first switching transistor, the second terminal is connected to the control switch, and the control terminal is connected to the sealing control unit.

7. The safe torque shutdown and star-sealing control circuit according to claim 3, characterized in that, The safety protection module includes a safety controller, a first switching transistor, and a buffer; 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. The first terminal of the first switching transistor is connected to the power supply terminal, the second terminal is connected to the control switch, and the control terminal is connected to the safety controller and the control module. The buffer is connected to the control module, the control switch and the star-sealing control unit respectively, and is used to disconnect the control module and the control switch when the star-sealing control unit is working.

8. The safety torque shutdown and star-sealing control circuit according to claim 3, characterized in that, The switching unit includes: The third switching transistor has its first terminal connected to the power supply, its second terminal connected to the drive unit, and its control terminal connected to the safety torque shutdown controller.

9. The safety torque shutdown and star-sealing control circuit according to claim 1, characterized in that, The frequency conversion module also includes: The rectifier unit is connected to the power supply and the switching unit; The bus capacitor is connected in parallel with the rectifier unit; A braking resistor is connected to the switching unit; The fourth switching transistor has its first terminal connected to the braking resistor and its second terminal connected to the switching unit.

10. An elevator device, characterized in that, Includes a traction machine and the safety torque shutdown and star-sealing control circuit as described in any one of claims 1-9.

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