Passive electronic star-sealing device for three-phase synchronous elevators

Abstract

This disclosure relates to the field of elevator safety technology, and in particular to a passive electronic star-stop device for a three-phase synchronous elevator. The passive electronic star-stop device for a three-phase synchronous elevator includes: an operation status monitoring module for monitoring the operation status of the three-phase synchronous elevator; a rectifier bridge connected to the traction machine coil of the three-phase synchronous elevator for converting the three-phase AC power generated by the uncontrolled rotation of the traction machine into two-phase DC power; a switching power supply for converting the two-phase DC power output from the rectifier bridge into power supply DC power; a control module for determining the status of the three-phase synchronous elevator and generating an enable signal when the three-phase synchronous elevator experiences uncontrolled movement; and an execution module for controlled consumption of the two-phase DC power output from the rectifier bridge under the control of the enable signal. This disclosure allows for electronic braking using the elevator's own generated electrical energy without an external power supply, avoiding the losses and failure risks of traditional mechanical braking methods.

Description

Technical Field

[0001] This disclosure relates to the field of elevator safety technology, and in particular to a passive electronic star-sealing device for a three-phase synchronous elevator. Background Technology

[0002] With rapid urban development, elevators have become an indispensable vertical transportation tool for people's travel, and their operational safety is directly related to the safety of passengers' lives and property. The promulgation and implementation of GB / T 7588—2020 "Safety Code for Elevator Manufacturing and Installation" has also placed higher demands on elevator safety functions. Among them, the star-shaped braking system is one of the key factors in the elevator emergency braking system. Its principle is to form a star structure by short-circuiting the ends of the three-phase windings of the elevator traction machine. The inertia of the traction machine rotor cuts the magnetic field lines to generate a reverse electromagnetic torque, thereby achieving deceleration and braking of the elevator car, adding another layer of safety assurance to the elevator.

[0003] Traditional elevator star-sealing devices are mainly divided into two categories: mechanical contact type and active electronic type. Mechanical contact type usually relies on the normally closed contacts of the main contactor to short-circuit the three-phase windings of the traction machine. It suffers from problems such as contact wear, contact erosion, and susceptibility to environmental interference. Its reliability decreases significantly after long-term use. Due to the lack of monitoring devices, its failure is difficult to detect before a danger occurs. Although the active electronic star-sealing device solves the problem of mechanical contact wear, its operation requires the external power supply of the elevator control system. When the elevator main power supply or frequency converter fails, the electronic star-sealing device will fail, posing a certain safety hazard.

[0004] Public content I. Technical problems to be solved This disclosure aims to at least partially solve one of the aforementioned technical problems.

[0005] II. Technical Solution This disclosure provides a passive electronic star-sealing device for a three-phase synchronous elevator. The passive electronic star-sealing device for a three-phase synchronous elevator includes: a rectifier bridge, a switching power supply, an operation status monitoring module, a control module, and an execution module; wherein: the operation status monitoring module is used to monitor the operation status of the three-phase synchronous elevator; the rectifier bridge is connected to the traction machine coil of the three-phase synchronous elevator and is used to convert the three-phase AC power generated by the uncontrolled rotation of the traction machine into two-phase DC power; the switching power supply is connected to the DC side of the rectifier bridge and is used to convert the two-phase DC power output by the rectifier bridge into power supply DC power; the control module is powered by the switching power supply and is electrically connected to the operation status monitoring module, and is used to determine the status of the three-phase synchronous elevator using the monitoring signal from the operation status monitoring module, and generate an enable signal when the three-phase synchronous elevator undergoes uncontrolled movement; the execution module, whose controlled end is electrically connected to the control module, is used to controllably consume the two-phase DC power output by the rectifier bridge under the control of the enable signal, thereby forming a braking load on the traction machine side to achieve electronic star-sealing braking.

[0006] In some embodiments of this disclosure, the operating status monitoring module includes: a rotation status sensor that monitors the rotation status of the elevator traction sheave; and a braking current sensor that monitors the braking current of the brake coil of the three-phase synchronous elevator. The control module executes the following control logic: when the following signals are received, it is determined that the three-phase synchronous elevator has undergone uncontrolled movement: the rotation status sensor detects that the elevator traction sheave is rotating; and the braking current sensor detects that the brake coil current is lower than a preset threshold.

[0007] In some embodiments of this disclosure, the operating status monitoring module includes: a rotational state sensor that monitors the rotational state of the elevator traction sheave; a braking current sensor that monitors the braking current of the brake coil of the three-phase synchronous elevator; the operating status monitoring module further includes: a motor current sensor that monitors the motor current of the traction machine coil; and a rectified voltage sensor that monitors the rectified voltage output by the rectifier bridge related to the output voltage of the motor coil; the control module executes the following control logic: when the following signals are received, it is initially determined that the three-phase synchronous elevator has experienced uncontrolled movement: the rotational state sensor detects that the elevator traction sheave is rotating; the braking current sensor detects that the brake coil current is lower than a preset threshold; based on the initial determination that the three-phase synchronous elevator has experienced uncontrolled movement, when the following signals are received, it is confirmed that the three-phase synchronous elevator has experienced uncontrolled movement, and an enable signal is sent to the execution module: the rectified voltage sensor detects that the rectified voltage is higher than a preset threshold; the motor current sensor detects that the motor current is lower than a preset threshold; In some embodiments of this disclosure, the rotational state sensor is a Hall effect magnetic encoder.

[0008] In some embodiments of this disclosure, the braking current sensor is a Hall current transformer.

[0009] In some embodiments of this disclosure, the positive and negative power input terminals of the execution module are connected to the positive and negative rectified output terminals of the rectifier bridge via a first switch K1 and a second switch K2, respectively. The execution module includes: a voltage-controlled PWM generator, whose control terminal is connected to the output terminal of the control module, for outputting PWM pulses when receiving an enable signal from the control module; a trigger circuit, whose positive and negative power input terminals are connected to the positive and negative power input terminals of the execution module, respectively, and whose signal input terminal is connected to the signal output terminal of the voltage-controlled PWM generator, for outputting a pulse trigger signal according to the PWM pulse; and a chopper, including: a power switching device, whose control terminal is connected to the trigger signal output terminal of the trigger circuit, whose first main terminal is connected to the positive input terminal of the execution module via an inductor L, and whose second main terminal is connected to the negative input terminal of the execution module via a power dissipation resistor RL.

[0010] In some embodiments of this disclosure, the voltage-controlled PWM generator has its sensing positive terminal and sensing negative terminal connected to the input positive terminal and input negative terminal of the execution module, respectively. The voltage-controlled PWM generator adjusts the duty cycle of the PWM pulse according to the following principles: when VK > V0, the duty cycle of the PWM pulse is increased, causing the execution module to consume more rectifier bridge output power; when VK < V0, the duty cycle of the PWM is decreased, causing the execution module to consume less rectifier bridge output power. Here, VK is the voltage value between the input positive terminal and input negative terminal of the execution module; V0 is a preset voltage reference value, V0 is between 0.8 and 2 times Vt, and Vt is the operating voltage of the control module.

[0011] In some embodiments of this disclosure, the power switching device is an insulated gate bipolar transistor (IGBT), with its control terminal being the gate, its first main terminal being the collector, and its second main terminal being the emitter; or, the power switching device is a field-effect transistor (MOS), with its control terminal being the gate, its first main terminal being the drain, and its second main terminal being the source.

[0012] In some embodiments of this disclosure, the first main terminal of the power switching device is connected to the positive input terminal of the execution module via a fourth diode D4 and a tenth resistor R10.

[0013] In some embodiments of this disclosure, the sensing terminal of the trigger circuit is connected to the negative input terminal of the execution module through a power-consuming resistor RL, wherein the trigger circuit increases the trigger voltage when the voltage of the emitter of the insulated gate bipolar transistor (IGBT) is lower than a preset threshold.

[0014] In some embodiments of this disclosure, the execution module further includes: a voltage regulator module, the output of which is connected to the power supply terminal of a voltage-controlled PWM generator, for providing a stable preset voltage reference value to the voltage-controlled PWM generator; and a voltage divider and current limiting circuit, including: a fourth PNP transistor Q4, the emitter of which is connected to the positive input terminal of the execution module through a sixth resistor R6, the collector of which is connected to the negative input terminal of the execution module through a seventh resistor R7, and the base of which is connected to the positive rectified output terminal of the rectifier through a second resistor R2; a fifth NPN transistor Q5, the collector of which is connected to the positive input terminal of the execution module through a ninth resistor R9; the emitter of which is connected to the negative input terminal of the execution module through an adjustable resistor RU, and is connected to the negative input terminal of the execution module through a first capacitor C1, and is connected to the positive input terminal of the voltage regulator module; and the base of which is connected to the collector of the fourth PNP transistor Q4 through an eighth resistor R8, and is connected to the negative input terminal of the execution module through a second Zener diode DZ2.

[0015] In some embodiments of this disclosure, the control module includes: a microcontroller for executing control logic and generating an enable signal; and a signal processing module including: a first transistor Q1, a second transistor Q2, and a third transistor Q3, wherein: the base of the first transistor Q1 is connected to the microcontroller via a first diode D1 to input the enable signal, and is connected to the negative terminal of the rectifier input via a first resistor R1; its collector is connected to the positive terminal of the rectifier output via a second resistor R2; and its emitter is connected to the negative terminal of the rectifier output via a third resistor R3 to invert the enable signal; The emitter of the second transistor Q2 is connected to the positive terminal of the rectified output through the fourth resistor R4, and its base is connected to the collector of the first transistor Q1 to amplify the reverse enable signal; the base of the third transistor Q3 is connected to the collector of the second transistor Q2 through the fifth resistor R5, and is connected to the positive terminal of the rectified output through the first Zener diode DZ1, and its collector is connected to the positive terminal of the rectified output, and its emitter controls the opening and closing of the parallel first switch K1 and second switch K2; at the same time, the negative terminal of the rectified output is connected to the emitter of the third transistor through the third diode D3.

[0016] In some embodiments of this disclosure, the switching power supply includes: an input filtering unit, a switching power supply chip XD308H, a feedback-power supply coupling adjustment unit, a current limiting monitoring unit, and an output filtering and dual-channel protection unit; wherein: the input filtering unit includes: a second inductor L2, a fourth capacitor C4, and a fifth capacitor C5; the second inductor L2 is connected in series between the input power supply and the drain input terminal of the switching power supply chip XD308H, and the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel on the input side of the second inductor L2, for suppressing spikes and filtering high frequencies of input energy under a wide range of input voltage conditions; the switching power supply chip XD308H includes four drain terminal pins DRain and a power supply pin VDD / B connected in parallel. The input filtering unit has multiple drain pins (P, FB, GND / S, and CS) directly connected to its output, allowing for direct energy acquisition during wide input voltage variations. The feedback-power supply coupling adjustment unit includes a first capacitor (C1), a first resistor (R1), and a second resistor (R2). The first capacitor (C1) is connected between the power supply pin (VDD / BP) and the feedback pin (FB) to couple and adjust the internal power supply and feedback signal during startup and steady-state phases. The first resistor (R1) and the second resistor (R2) are connected in series between the output and the ground pin (GND / S), with their voltage divider node connected to the feedback pin (FB). This allows the output voltage information to be fed back to the chip after voltage division, achieving output-based regulation. The voltage is regulated in a closed loop, and dynamic compensation for the power supply pin VDD / BP is formed through the first capacitor C1. The current limiting monitoring unit includes a third resistor R3, which is connected in series between the ground pin GND / S and the current monitoring pin CS. It is used to convert the current flowing through the chip into a monitoring voltage signal and input it to the current monitoring pin CS, thereby achieving current limiting under wide input voltage conditions. The output filtering and dual-channel protection unit includes a first inductor L1, a second capacitor C2, a third capacitor C3, a first diode D1, a second diode D2, and a fourth resistor R4. The first inductor L1 is connected in series between the ground pin GND / S and the output terminal to store energy and smooth the output current. The second capacitor C2 is connected to the ground pin. A third capacitor C3 is connected between the output terminal and ground, and between the GND / S pin and ground, to filter the output voltage. A first diode D1 is connected between the output terminal and the ground pin GND / S to form a first clamping path, and a second diode D2 is connected between the ground pin GND / S and ground to form a second clamping path, so as to provide dual-path clamping protection for the voltage under different operating conditions. A fourth resistor R4 is connected between the output terminal and ground to form a minimum load and provide a discharge path. Through the synergistic effect of the input filtering unit, the feedback-power supply coupling adjustment unit, the current limiting monitoring unit, and the output filtering and dual-channel protection unit, the switching power supply chip XD308H can achieve stable output over a wide input voltage range.

[0017] III. Beneficial Effects As can be seen from the above technical solution, this disclosure has at least one of the following beneficial effects compared to the prior art: (1) In this disclosure, the passive electronic star-sealing device of the three-phase synchronous elevator can effectively improve the safety of the elevator by timely braking when the elevator moves uncontrollably through the coordinated work of each module. Especially in the absence of external power supply, the electronic braking is performed by using the power generated by the elevator itself, which avoids the loss and failure risk of traditional mechanical braking methods and has the advantages of energy saving, reliability and simplicity.

[0018] (2) In this disclosure, the total equivalent inductance formed by the electrical energy of the synchronous traction machine and the external inductance L is used to consume the energy generated by the uncontrolled rotation of the elevator. Through the control of the power switching device Q, the electrical energy can be consumed and recovered efficiently, further enhancing the braking capability and energy efficiency of the system. This design can effectively avoid excessive energy waste and improve the energy efficiency and continuous stability of the system.

[0019] (3) In this disclosure, the power switching device Q, the energy-consuming resistor RL, and the inductor L work together to effectively dissipate the electrical energy generated when the elevator malfunctions. The chopper design enables the power switching device Q to periodically turn on and off, forming a controlled current path, ensuring effective energy consumption, thereby achieving electronic star-shaped braking. This design improves the efficiency of the braking process while reducing energy waste.

[0020] (4) In this disclosure, by adjusting the duty cycle of the PWM pulse signal, the control module can dynamically adjust the energy consumption rate according to the change of the DC bus voltage. When the DC bus voltage is too high, the duty cycle increases, increasing current consumption; conversely, when the voltage is too low, the duty cycle decreases, reducing current consumption. This control logic helps to optimize the utilization of electrical energy, reduce the system burden, and improve the braking effect of the elevator and the overall stability of the system.

[0021] (5) In this disclosure, the sensing terminal of the trigger circuit is connected to the negative input terminal of the execution module through a power-consuming resistor RL. When the voltage of the IGBT emitter is lower than a preset threshold, the trigger circuit increases the trigger voltage. The function of this part of the circuit is to test the IGBT loop circuit to determine whether the trigger voltage needs to be increased, so as to ensure the deep saturation of the IGBT as much as possible, in order to facilitate the better implementation of the chopping function.

[0022] (6) In this disclosure, by setting up multiple sensors (rotation state sensor, braking current sensor, motor current sensor, rectifier voltage sensor), the operating status of the elevator can be accurately monitored, and the danger of uncontrolled movement can be monitored in real time. The real-time monitoring of this module helps to respond quickly, ensure the safe operation of the elevator, and avoid the delay in handling elevator malfunctions in traditional methods.

[0023] (7) In this embodiment, through the synergistic effect of the input filtering unit, the feedback-power supply coupling adjustment unit, the current limiting monitoring unit, and the output filtering and dual-channel protection unit, the switching power supply chip XD308H achieves stable output over a wide input voltage range.

[0024] (8) In this disclosure, in order to improve the reliability of the control module, a status monitoring and protection circuit is designed, including braking current monitoring and power section temperature monitoring. The working state of the execution module is adjusted by the signals returned by the monitoring circuits of each part, so as to ensure the braking effect and avoid braking failure due to damage to the device. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a passive electronic star-sealing device for a three-phase synchronous elevator according to an embodiment of this disclosure.

[0026] Figure 2 for Figure 1 The circuit diagram shown is for the switching power supply in the passive electronic star-sealing device for a three-phase synchronous elevator.

[0027] Figure 3A for Figure 1 The diagram shows the control module and execution module in the passive electronic star-sealing device for a three-phase synchronous elevator.

[0028] Figure 3B for Figure 1 The diagram shows the equivalent circuit of the traction machine in the passive electronic star-sealing device for a three-phase synchronous elevator. Detailed Implementation

[0029] This disclosure provides a highly reliable passive electronic star-sealing device that can operate rapidly without relying on elevator frequency converters and elevator power supplies. It is of great significance for improving the safety and stability of elevator emergency braking systems and reducing elevator operation and maintenance costs.

[0030] To make the objectives, technical solutions and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and with reference to the accompanying drawings.

[0031] In one exemplary embodiment of this disclosure, a passive electronic star-sealing device for a three-phase synchronous elevator is provided. Figure 1This is a schematic diagram of a passive electronic star-sealing device for a three-phase synchronous elevator according to an embodiment of this disclosure. As shown in the figure, the passive electronic star-sealing device for elevators in this embodiment adopts a modular design. The overall structure is divided into four parts: a rectifier bridge, a switching power supply, an operating status monitoring module, a control module, and an execution module. Each module works together to achieve the passive star-sealing braking function. Specifically, The rectifier bridge is connected to the traction machine coil of a three-phase synchronous elevator and is used to convert the three-phase AC power generated by the uncontrolled rotation of the traction machine into two-phase DC power. A switching power supply, connected to the DC side of the rectifier bridge, is used to convert the two-phase DC output from the rectifier bridge into the DC power supply. The operation status monitoring module is used to monitor the operation status of the three-phase synchronous elevator; The control module, powered by the switching power supply, is electrically connected to the operation status monitoring module. It is used to determine the status of the three-phase synchronous elevator using the monitoring signal of the operation status monitoring module, and to generate an enable signal when the three-phase synchronous elevator undergoes uncontrolled movement. The execution module, whose controlled end is electrically connected to the control module, is used to controllably consume the two-phase DC power output from the rectifier bridge under the control of the enable signal, thereby forming a braking load on the traction machine side to achieve electronic star-shaped braking.

[0032] The overall workflow of the device is as follows: The device is powered by the elevator traction machine's power input line; during normal operation or when uncontrolled movement begins due to accidental loss of control, there is voltage on the power line. This voltage is converted from three-phase AC to two-phase DC by a rectifier bridge, and then the voltage is reduced by a switching power supply to power the control module; the operation status monitoring module monitors the elevator's operating status through sensors; the control module determines whether the elevator is in an uncontrolled movement state based on the sensors in the operation status monitoring module. When the elevator is in an uncontrolled movement state, it outputs an enable control signal to drive the execution module to start consuming energy for braking, controlling the braking current in the three-phase windings of the elevator motor to achieve braking; after the elevator stops running or braking is completed, the device loses power and stops running, waiting for the next elevator operation or uncontrolled operation to obtain power to run again.

[0033] As explained above, the passive electronic braking device for the three-phase synchronous elevator in this embodiment, through the coordinated operation of its modules, can promptly apply braking when the elevator experiences uncontrolled movement, effectively improving elevator safety. Especially in the absence of an external power supply, it utilizes the elevator's own generated electrical energy for electronic braking, avoiding the losses and failure risks associated with traditional mechanical braking methods, and offering advantages such as energy saving, reliability, and simplicity.

[0034] The following is a detailed description of each component of the passive electronic star-sealing device for three-phase synchronous elevators in this embodiment.

[0035] I. Rectifier Bridge and Switching Power Supply The rectifier bridge and the switching power supply are the core power supply units of the passive electronic star-sealing device. Their function is to separate from the power circuit and obtain the electrical energy necessary for the operation of the control module and the execution module during normal operation or emergency braking of the elevator, especially to provide a stable working power supply for the entire device in emergency situations.

[0036] In this embodiment, the rectifier bridge is a full-bridge rectifier circuit. Its three input terminals are respectively connected to the three-phase power (R, S, T) of the traction machine of the three-phase synchronous elevator, which is used to convert the three-phase AC power generated by the runaway rotation of the traction machine into two-phase DC power. The structure of the rectifier bridge will not be described in detail.

[0037] In this embodiment, considering the significant voltage difference in the traction machine power input circuit between normal operation and emergency braking states, the switching power supply needs to possess characteristics such as high withstand voltage, wide operating voltage range, and high energy conversion efficiency. Taking all these requirements into account, a wide-voltage input switching power supply, model XD308H, is adopted to ensure a stable and reliable power supply for the device during both power generation and normal elevator operation.

[0038] Figure 2 for Figure 1 The circuit diagram shown is for the switching power supply in a passive electronic star-sealing device for a three-phase synchronous elevator. As shown, the switching power supply includes: an input filtering unit, a switching power supply chip XD308H, a feedback-power supply coupling adjustment unit, a current limiting monitoring unit, and an output filtering and dual-channel protection unit; wherein: The input filtering unit includes: a second inductor L2, a fourth capacitor C4, and a fifth capacitor C5; the second inductor L2 is connected in series between the input power supply and the drain input terminal of the switching power supply chip XD308H, and the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel on the input side of the second inductor L2, which are used to suppress spikes and filter high frequencies of input energy under a wide range of input voltage conditions. The XD308H switching power supply chip includes four drain terminal pins DRain, power supply pins VDD / BP, feedback pin FB, ground pin GND / S, and current monitoring pin CS, all connected in parallel. Multiple drain terminal pins DRain are directly connected to the output of the input filtering unit to achieve direct energy acquisition when the input voltage varies widely. The feedback-power supply coupling adjustment unit includes a first capacitor C1, a first resistor R1, and a second resistor R2. The first capacitor C1 is connected across the power supply pin VDD / BP and the feedback pin FB, and is used to couple and adjust the internal power supply and feedback signal of the chip during the startup and steady-state phases. The first resistor R1 and the second resistor R2 are connected in series between the output terminal and the ground pin GND / S, and their voltage divider node is connected to the feedback pin FB, so that the output voltage information is fed back to the chip after voltage division, realizing closed-loop adjustment based on the output voltage, and forming dynamic compensation for the power supply pin VDD / BP through the first capacitor C1. The current limiting monitoring unit includes a third resistor R3, which is connected in series between the ground pin GND / S and the current monitoring pin CS. It is used to convert the current flowing through the chip into a monitoring voltage signal and input it to the current monitoring pin CS, thereby achieving current limiting under wide input voltage conditions. The output filtering and dual-channel protection unit includes a first inductor L1, a second capacitor C2, a third capacitor C3, a first diode D1, a second diode D2, and a fourth resistor R4. The first inductor L1 is connected in series between the ground pin GND / S and the output terminal to store and smooth the output current. The second capacitor C2 is connected between the ground pin GND / S and ground, and the third capacitor C3 is connected between the output terminal and ground to filter the output voltage. The first diode D1 is connected between the output terminal and the ground pin GND / S to form a first clamping path, and the second diode D2 is connected between the ground pin GND / S and ground to form a second clamping path, providing dual-path clamping protection for the voltage under different operating conditions. The fourth resistor R4 is connected between the output terminal and ground to form a minimum load and provide a discharge path. In this embodiment, through the synergistic effect of the input filtering unit, the feedback-power supply coupling adjustment unit, the current limiting monitoring unit, and the output filtering and dual-channel protection unit, the switching power supply chip XD308H achieves stable output over a wide input voltage range.

[0039] II. Operational Status Monitoring Module The function of the operation status monitoring module is to monitor the elevator's operating status in real time. When an emergency situation of uncontrolled elevator operation is detected, the actuator is quickly triggered to intervene in braking. The operation status monitoring module is crucial to ensuring that the device can reliably intervene in braking, and it must have the characteristics of low power consumption, high sensitivity, and fast response.

[0040] In this embodiment, the operation status monitoring module includes four sensors: a rotation status sensor, a braking current sensor, a motor current sensor, and a rectified voltage sensor.

[0041] ① Rotation state sensor, which monitors the rotation state of the elevator traction sheave, specifically a Hall effect magnetic encoder; ② Braking current sensor, which monitors the braking current of the brake coil of a three-phase synchronous elevator, specifically a Hall current transformer; ③ Motor current sensor, which monitors the motor current of the traction machine coil; ④ The rectified voltage sensor monitors the rectified voltage of the two-phase DC power output from the rectifier bridge. This rectified voltage is related to the output voltage of the motor coil.

[0042] Four sensors transmit relevant signals to the control module, which then determines the status of the three-phase synchronous motor.

[0043] This disclosure utilizes multiple sensors (rotation state sensor, braking current sensor, motor current sensor, and rectified voltage sensor) to accurately monitor the elevator's operating status and detect any uncontrolled movement or dangerous situations in real time. This real-time monitoring module facilitates rapid response, ensures safe elevator operation, and avoids the delays in handling elevator malfunctions that are common in traditional methods.

[0044] III. Control Module The control module is the core control unit of the device. Its function is to receive status signals from the elevator operation status monitoring module, determine the elevator's operating status, output corresponding control signals to drive the execution module's actions, and simultaneously monitor the execution module's operating status to achieve fault protection. The control module uses an STM32F103C8T6 microcontroller, which is based on the ARM Cortex-M3 core, operates at a frequency of 72MHz, and has abundant I / O interfaces, timers, ADCs, and other peripherals. It also has low power consumption, meeting the technical requirements of this device.

[0045] In this disclosure, the control module can operate in one of two modes: a safety mode and a reliable operation mode. The sensor settings and control logic will differ in these modes. In some embodiments, the control module can be set to a safety mode, that is, to prioritize the safety of passengers. The control module executes the following control logic: when it is initially determined that the three-phase synchronous elevator has moved uncontrollably, it sends an enable signal to the execution module, causing the execution module to engage the brake and stop the elevator.

[0046] In this scenario, the initial assessment alone is sufficient to determine the state of the three-phase synchronous motor and issue an enable control signal accordingly. However, during actual experimental verification, the applicant discovered that errors frequently occurred due to malfunctions or inaccuracies in the braking current sensor. Therefore, to improve the reliability of the monitoring module, the operating status monitoring module incorporates simultaneous monitoring and assessment of more parameters.

[0047] In this embodiment, the control module operates in a reliable operation mode, prioritizing the stable operation of the elevator to prevent passengers from being startled by sudden stops and starts. The control module first makes a preliminary judgment, and then makes a confirmation judgment.

[0048] ①Preliminary judgment In the initial assessment, two sensors—the rotation status sensor and the braking current sensor—are used for judgment. The judgment is based on the following: the brake is engaged but not effectively stopped. Specifically, when current flows through the brake coil, the elevator is in an open state controlled by the control system, and the main unit's rotation is under controlled operation. When no current flows through the brake coil, the main unit should be in a braking state. If the elevator main unit rotates under these conditions, it is very likely that the brake has failed, resulting in a dangerous situation.

[0049] ② Confirmation and Judgment In this embodiment, when the control module receives the following signals, it confirms, based on a preliminary judgment, that the three-phase synchronous elevator has moved uncontrollably and sends an enable signal to the execution module: the rectified voltage is detected by the rectified voltage sensor to be higher than a preset threshold; the current is detected by the motor current sensor to be lower than a preset threshold.

[0050] In this embodiment, the control module executes the following control logic: Based on the initial judgment, when the following signals are received, it determines that the braking current sensor is faulty and does not send an enable signal to the execution module: the elevator traction sheave is detected to be rotating by the rotation status sensor; the rectified voltage is detected to be lower than a preset threshold by the rectified voltage sensor; the current is detected to be higher than a preset threshold by the motor current sensor. In this case, the administrator is notified of the braking current sensor fault.

[0051] Typically, the preset threshold for brake coil current is 1 / 10 of the rated current of the brake coil; the preset threshold for rectified voltage is 1 / 30 of the rated voltage of the motor; and the preset threshold for motor current is 0.5A.

[0052] The workflow of the control module is as follows: (1) When the signal from the four sensors in the running status monitoring module is received and the elevator is judged to be moving uncontrolled, the processor is awakened and the instruction execution module is given to intervene in braking; (2) After the execution module intervenes in braking, the voltage, current and other status parameters of the key parts of the execution module are collected through the ADC interface to monitor its running status; (3) After braking is completed, the control module instructs each module to stop working and the processor to re-enter the sleep state.

[0053] In this disclosure, to improve the reliability of the control module, a status monitoring and protection circuit is designed, including braking current monitoring and power section temperature monitoring. The operating state of the execution module is adjusted based on the signals returned from each monitoring circuit, ensuring braking effectiveness while preventing braking failure due to damage to the device.

[0054] Figure 3A for Figure 1 The diagram shows the control module and execution module of the passive electronic star-sealing device for a three-phase synchronous elevator. Please refer to... Figure 3A The control module includes: The microcontroller (not shown in the figure) is used to execute control logic and generate enable signals; The signal processing module includes: a first transistor Q1, a second transistor Q2, and a third transistor Q3, wherein: The base of the first transistor Q1 is connected to the microcontroller through the first diode D1 to input an enable signal, and is connected to the negative terminal of the rectifier input through the first resistor R1; its collector is connected to the positive terminal of the rectifier output through the second resistor R2; and its emitter is connected to the negative terminal of the rectifier output through the third resistor R3 to reverse the enable signal. The second transistor Q2 has its emitter connected to the positive terminal of the rectified output through the fourth resistor R4, and its base connected to the collector of the first transistor Q1, which is used to amplify the reverse enable signal. The base of the third transistor Q3 is connected to the collector of the second transistor Q2 through the fifth resistor R5, and is connected to the positive terminal of the rectifier output through the first Zener diode DZ1. Its collector is connected to the positive terminal of the rectifier output, and its emitter controls the opening and closing of the first switch K1 and the second switch K2 connected in parallel. Meanwhile, the negative terminal of the rectified output is connected to the emitter of the third transistor through the third diode D3.

[0055] IV. Execution Module The function of the actuator module is to receive control signals from the control module and realize the short-circuiting (star-locking) or disconnection of the three-phase windings of the elevator traction machine. It is the actuator for realizing star-locking braking. The performance of the actuator module directly affects the response speed and braking effect of star-locking braking, and it must have the characteristics of rapid response, reliable switching, and large current carrying capacity.

[0056] During high-speed sealing, when the high-speed sealing braking torque is greater than the car's unbalanced torque, the speed decreases and the sealing torque increases until the speed exceeds the inflection point speed and stabilizes at a certain speed to the left of the inflection point speed; when the car's unbalanced torque is greater than the braking torque during high-speed sealing, the speed increases and the braking torque becomes smaller, thus causing the car to run away.

[0057] As shown in the figure, the positive and negative power input terminals of the execution module are connected to the positive and negative rectified output terminals of the rectifier bridge via a first switch K1 and a second switch K2, respectively. The execution module includes: A voltage-controlled PWM generator, whose control terminal is connected to the output terminal of the control module, is used to output PWM pulses when it receives an enable signal from the control module; The voltage regulator module has its output connected to the power supply of the voltage-controlled PWM generator to provide a stable preset voltage reference value for the voltage-controlled PWM generator. A voltage divider and current limiting circuit is used to provide acceptable voltage and current to the voltage regulator module; The trigger circuit has its positive and negative power input terminals connected to the positive and negative power input terminals of the execution module, respectively, and its signal input terminal connected to the signal output terminal of the voltage-controlled PWM generator, which is used to output a pulse trigger signal according to the PWM pulse. The chopper includes: a power switching device, whose control terminal is connected to the trigger signal output terminal of the trigger circuit, whose first main terminal is connected to the positive input terminal of the execution module through an inductor L, and whose second main terminal is connected to the negative input terminal of the execution module through a power dissipation resistor RL.

[0058] In this embodiment, the coordinated operation of the power switching device Q, the energy-consuming resistor RL, and the inductor L effectively dissipates the electrical energy generated when the elevator malfunctions. The chopper design allows the power switching device Q to periodically turn on and off, forming a controlled current path and ensuring effective energy consumption, thereby achieving electronic star-shaped braking. This design improves the efficiency of the braking process while reducing energy waste.

[0059] The following provides a detailed description of each part of the execution module.

[0060] The voltage-controlled PWM generator has its positive and negative sensing terminals connected to the positive and negative input terminals of the execution module, respectively. The voltage-controlled PWM generator adjusts the duty cycle of the PWM pulse according to the following principles: when VK > V0, the duty cycle of the PWM pulse is increased, causing the execution module to consume more rectifier bridge output power; when VK < V0, the duty cycle of the PWM pulse is decreased, causing the execution module to consume less rectifier bridge output power. Here, VK is the voltage value between the positive and negative input terminals of the execution module; V0 is a preset voltage reference value, between 0.8 and 2 times Vt; and Vt is the operating voltage of the control module.

[0061] In this embodiment, by adjusting the duty cycle of the PWM pulse signal, the control module can dynamically adjust the rate of energy consumption according to changes in the DC bus voltage. When the DC bus voltage is too high, the duty cycle increases, increasing current consumption; conversely, when the voltage is too low, the duty cycle decreases, reducing current consumption. This control logic helps optimize energy utilization, reduce system load, and improve the elevator's braking effect and overall system stability.

[0062] In the voltage regulator module, the preset voltage reference value is set to 12V. This preset voltage can be set as needed. Generally, it should be referenced to circuit designs that require low-voltage power supply, but it should not exceed 10% of the rated voltage of the traction host.

[0063] A voltage divider and current limiting circuit, used to provide acceptable voltage and current to the voltage regulator module, includes: a fourth PNP transistor Q4, whose emitter is connected to the positive input terminal of the execution module through a sixth resistor R6, its collector is connected to the negative input terminal of the execution module through a seventh resistor R7, and its base is connected to the positive rectified output terminal of the rectifier through a second resistor R2; a fifth NPN transistor Q5, whose collector is connected to the positive input terminal of the execution module through a ninth resistor R9; its emitter is connected to the negative input terminal of the execution module through an adjustable resistor RU, and is also connected to the negative input terminal of the execution module through a first capacitor C1, and connected to the positive input terminal of the voltage regulator module; its base is connected to the collector of the fourth PNP transistor Q4 through an eighth resistor R8, and is also connected to the negative input terminal of the execution module through a second Zener diode DZ2.

[0064] The power switching device is an insulated gate bipolar transistor (IGBT), with its control terminal being the gate, its first main terminal being the collector, and its second main terminal being the emitter; or, the power switching device is a field-effect transistor (MOS), with its control terminal being the gate, its first main terminal being the drain, and its second main terminal being the source.

[0065] The first main terminal of the power switching device is connected to the positive input terminal of the execution module through the fourth diode D4 and the tenth resistor R10. This part of the circuit serves as a freewheeling circuit for the inductor L. The fourth diode D4 prevents the electrical energy in L from breaking down the IGBT when the IGBT is turned off, and the tenth resistor R10 prevents damage to the fourth diode D4.

[0066] In this embodiment, the sensing terminal of the trigger circuit is connected to the negative input terminal of the execution module via a power-consuming resistor RL. When the voltage at the IGBT emitter is lower than a preset threshold, the trigger circuit increases the trigger voltage. The function of this part of the circuit is to test the IGBT's loop circuit to determine whether an increase in the trigger voltage is necessary, ensuring the IGBT is as deeply saturated as possible during conduction, thus facilitating better implementation of the chopping function.

[0067] Figure 3B for Figure 1 The diagram shows the equivalent circuit of the traction machine in the passive electronic star-sealing device for a three-phase synchronous elevator. Figure 3BThe left half of the diagram shows the equivalent circuit of the traction machine. Due to the internal resistance of the traction machine windings, the traction machine can be equivalently represented as an inductor and a resistor connected in series. When a short circuit occurs, the braking energy is consumed through the resistor. During high-speed braking, the chopper limits the current in the circuit, ensuring it does not exceed the current during normal operation of the traction machine. The heat generated is comparable to that generated by the traction machine at rated torque output, preventing overheating and damage. This design fully utilizes the role of the traction machine in the energy-consumption braking process and has the following advantages: 1. Significantly reduced heat generation and size of the chopper; 2. Because braking current control is implemented, the vehicle can decelerate at a relatively gentle rate during high-speed braking, and this deceleration rate can be set as needed, ensuring passenger safety during emergency braking. 3. It can prevent damage to the traction machine and wiring from excessive current during high-speed braking; As can be seen, this embodiment utilizes the total equivalent inductance formed by the electrical energy of the synchronous traction machine and the external inductance L to dissipate the energy generated by the uncontrolled rotation of the elevator. Through the control of the power switching device Q, the electrical energy can be efficiently consumed and recovered, further enhancing the system's braking capability and energy efficiency. This design effectively avoids excessive energy waste and improves the system's energy efficiency and continuous stability.

[0068] The device has the following control logic: ① When the elevator is running normally, the highest voltage on the traction machine power line may reach 537V. At this time, only the switching power supply is put into operation to power the operation status monitoring module and the control module. Since its power is extremely low, it will not affect the operation of the elevator. ② When the elevator loses control at high speed, that is, when the motor current sensor detects that the traction machine drive current has disappeared and the rotation status sensor detects that the traction machine has not stopped rotating, the control module receives the abnormal operation status signal reported by the operation status monitoring module and sends an enable signal to the execution module. The execution module uses the electrical energy generated by the rotation of the traction machine to drive the relay to activate and connect the chopper to the power circuit of the traction machine to start braking. 2.1 During high-speed braking, the traction machine generates a large amount of electricity. The chopper operates in constant current mode to limit the current in the traction machine coil to no more than the set value, ensuring that the current passing through the internal resistance of the traction machine winding does not exceed the rated current of the traction machine, ensuring that the traction machine will not overheat and be damaged, and at the same time generating braking force according to the set value. 2.2 When the traction machine speed gradually decreases to the point where the generator voltage is close to the voltage required for the operation of the passive star-sealing device, the chopper enters the constant voltage working mode, and maintains the power supply for the device by reducing the chopper current.

[0069] 2.3 When the elevator starts to lose control at zero speed, the voltage generated by the traction machine gradually increases with the elevator's gliding speed. When the voltage reaches the starting voltage of the switching power supply, the switching power supply starts and supplies power to the elevator operation status monitoring module and control module. The control module receives the abnormal operation status signal reported by the operation status monitoring module and sends an enable signal to the execution module. The execution module uses the electrical energy generated by the rotation of the traction machine to drive the relay to engage and connect the chopper to the traction machine power circuit to start braking. At this time, the chopper works directly in constant voltage mode. After ensuring the power supply of this device, the excess electrical energy is converted into heat and consumed by short-circuiting the internal resistance of the traction machine winding, while generating braking force.

[0070] This concludes the description of the various embodiments of this disclosure. Based on the above description, those skilled in the art should have a clear understanding of this disclosure.

[0071] It should be noted that for some implementation methods, if they are not key contents of this disclosure and are well known to those skilled in the art, they are not described in detail in the accompanying drawings or text due to space limitations. In such cases, relevant prior art can be referred to for understanding.

[0072] The ordinal numbers used in this disclosure, such as “first,” “second,” “third,” “primary,” “secondary,” and Arabic numerals, letters, etc., used to modify the corresponding elements (or steps), are intended only to make one element (or step) with a certain name clearly distinguishable from another element (or step) with the same name, and do not imply that the element (or step) has any ordinal number, nor do they represent the order of one element (or step) with another element (or step).

[0073] The order of steps in this disclosure is not limited to those listed above unless otherwise specifically described or required to occur in sequence, and may be varied or rearranged as needed for the design.

[0074] Those skilled in the art will understand that the modules or steps of this disclosure described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computing device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this disclosure is not limited to any particular combination of hardware and software.

[0075] This disclosure can also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for performing part or all of the methods described herein. Such an implementation of the disclosure may be stored on a computer-readable medium or may take the form of one or more signals. Such signals may be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0076] This disclosure can be implemented using hardware comprising several different components and a suitably programmed computer. Various component embodiments of this disclosure can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Physical implementations of the hardware structure include, but are not limited to, physical devices, including, but not limited to, transistors, memristors, DNA computers, microcontrollers, microprocessors, or digital signal processors (DSPs). Furthermore, this disclosure is not directed to any particular programming language. It should be understood that the contents of this disclosure can be implemented using various programming languages, and the descriptions of specific languages ​​in this disclosure are for the purpose of disclosing the best mode of implementation of this disclosure.

[0077] Those skilled in the art will understand that in the claims and specification of this disclosure, the word "comprising" does not exclude the presence of elements (or steps) not listed in the claims. The word "a" or "an" preceding an element (or step) does not exclude the presence of a plurality of such elements (or steps).

[0078] Furthermore, the above embodiments are provided only to enable this disclosure to meet legal requirements, and this disclosure may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

[0079] Similarly, it should be understood that, for the sake of brevity, in the foregoing description of exemplary embodiments of this disclosure, various features of this disclosure are sometimes grouped together in a single embodiment, figure, or description thereof. However, this approach to disclosure should not be construed as reflecting an intention that the claimed disclosure requires more features than are expressly recited in each claim. Rather, as reflected in the claims, each aspect of the disclosure comprises fewer than all the features of the preceding single embodiment. Furthermore, embodiments may be used in combination with each other or with other embodiments based on design and reliability considerations; that is, technical features from different embodiments can be freely combined to form more embodiments. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this disclosure.

[0080] The above specific embodiments have provided a detailed description of the purpose, technical means, and beneficial effects of this disclosure. It should be understood that the purpose of the detailed description is to enable those skilled in the art to understand this disclosure more clearly, and it is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A passive electronic star-sealing device for a three-phase synchronous elevator, characterized in that, include: The system comprises a rectifier bridge, a switching power supply, an operating status monitoring module, a control module, and an execution module; among which: The operation status monitoring module is used to monitor the operation status of the three-phase synchronous elevator; The rectifier bridge is connected to the traction machine coil of a three-phase synchronous elevator and is used to convert the three-phase AC power generated by the uncontrolled rotation of the traction machine into two-phase DC power. A switching power supply, connected to the DC side of the rectifier bridge, is used to convert the two-phase DC output from the rectifier bridge into the DC power supply. The control module, powered by the switching power supply, is electrically connected to the operation status monitoring module. It is used to determine the status of the three-phase synchronous elevator using the monitoring signal of the operation status monitoring module, and to generate an enable signal when the three-phase synchronous elevator undergoes uncontrolled movement. The execution module, whose controlled end is electrically connected to the control module, is used to controllably consume the two-phase DC power output from the rectifier bridge under the control of the enable signal, thereby forming a braking load on the traction machine side to achieve electronic star-shaped braking.

2. The passive electronic star-sealing device for three-phase synchronous elevators according to claim 1, characterized in that, The operation status monitoring module includes: a rotation status sensor, which monitors the rotation status of the elevator traction sheave; and a braking current sensor, which monitors the braking current of the brake coil of the three-phase synchronous elevator. The control module executes the following control logic: The three-phase synchronous elevator is deemed to have moved uncontrolled when the following signals are received: the elevator traction sheave is detected to be rotating by the rotation status sensor; the brake coil current is detected to be lower than a preset threshold by the brake current sensor.

3. The passive electronic star-sealing device for three-phase synchronous elevators according to claim 1, characterized in that, The operation status monitoring module includes: a rotation status sensor, which monitors the rotation status of the elevator traction sheave; and a braking current sensor, which monitors the braking current of the brake coil of the three-phase synchronous elevator. The operation status monitoring module also includes: a motor current sensor, which monitors the motor current of the traction machine coil; and a rectifier voltage sensor, which monitors the rectified voltage output by the rectifier bridge, which is related to the output voltage of the motor coil. The control module executes the following control logic: When the following signals are received, it is preliminarily determined that the three-phase synchronous elevator has experienced uncontrolled movement: the rotation status sensor detects that the elevator traction sheave is rotating; the brake current sensor detects that the brake coil current is lower than a preset threshold. Based on the initial judgment that the three-phase synchronous elevator has moved uncontrollably, when the following signals are received, it is confirmed that the three-phase synchronous elevator has moved uncontrollably, and an enable signal is sent to the execution module: the rectified voltage is detected by the rectified voltage sensor to be higher than the preset threshold; the motor current is detected by the motor current sensor to be lower than the preset threshold.

4. The passive electronic star-sealing device for three-phase synchronous elevators according to claim 2, characterized in that, The rotation state sensor is: a Hall effect magnetic encoder; and / or, The braking current sensor is a Hall current transformer.

5. The passive electronic star-sealing device for three-phase synchronous elevators according to claim 1, characterized in that, The positive and negative power input terminals of the execution module are connected to the positive and negative rectified output terminals of the rectifier bridge via the first switch K1 and the second switch K2, respectively. The execution module includes: A voltage-controlled PWM generator, whose control terminal is connected to the output terminal of the control module, is used to output PWM pulses when it receives an enable signal from the control module; The trigger circuit has its positive and negative power input terminals connected to the positive and negative power input terminals of the execution module, respectively, and its signal input terminal connected to the signal output terminal of the voltage-controlled PWM generator, which is used to output a pulse trigger signal according to the PWM pulse. The chopper includes: a power switching device, whose control terminal is connected to the trigger signal output terminal of the trigger circuit, whose first main terminal is connected to the positive input terminal of the execution module through an inductor L, and whose second main terminal is connected to the negative input terminal of the execution module through a power dissipation resistor RL.

6. The passive electronic star-sealing device for three-phase synchronous elevators according to claim 5, characterized in that, The voltage-controlled PWM generator has its positive sensing terminal and negative sensing terminal connected to the positive input terminal and negative input terminal of the execution module, respectively. The voltage-controlled PWM generator adjusts the duty cycle of the PWM pulse according to the following principle: when V K When V > V0, increase the duty cycle of the PWM pulse, causing the execution module to consume more power output from the rectifier module; When V K When V < V0, reducing the duty cycle of the PWM allows the execution module to consume less rectifier bridge output power. K V0 represents the voltage value between the positive and negative input terminals of the execution module; V0 is the preset voltage reference value, and V0 is V t Between 0.8 and 2 times, V t This refers to the operating voltage of the control module.

7. The passive electronic star-sealing device for three-phase synchronous elevators according to claim 5, characterized in that, The power switching device is an insulated gate bipolar transistor (IGBT), with its control terminal being the gate, its first main terminal being the collector, and its second main terminal being the emitter; or, the power switching device is a field-effect transistor (MOS), with its control terminal being the gate, its first main terminal being the drain, and its second main terminal being the source; and / or, The first main terminal of the power switching device is connected to the positive input terminal of the execution module via a fourth diode (D4) and a tenth resistor (R10); and / or, The sensing terminal of the trigger circuit is connected to the negative input terminal of the execution module through a power dissipation resistor (RL). When the voltage of the emitter of the insulated gate bipolar transistor (IGBT) is lower than a preset threshold, the trigger circuit increases the trigger voltage.

8. The passive electronic star-sealing device for three-phase synchronous elevators according to claim 5, characterized in that, The execution module further includes: The voltage regulator module has its output connected to the power supply of the voltage-controlled PWM generator to provide a stable preset voltage reference value for the voltage-controlled PWM generator. The voltage divider and current limiting circuit includes: The fourth PNP transistor (Q4) has its emitter connected to the positive input terminal of the execution module through the sixth resistor (R6), its collector connected to the negative input terminal of the execution module through the seventh resistor (R7), and its base connected to the positive rectified output terminal of the rectifier through the second resistor R2. The collector of the fifth NPN transistor (Q5) is connected to the positive input terminal of the execution module through the ninth resistor (R9); its emitter is connected to the negative input terminal of the execution module through the adjustable resistor (RU), and is connected to the negative input terminal of the execution module through the first capacitor (C1), and is connected to the positive input terminal of the voltage regulator module; its base is connected to the collector of the fourth PNP transistor (Q4) through the eighth resistor (R8), and is connected to the negative input terminal of the execution module through the second Zener diode (DZ2).

9. The passive electronic star-sealing device for three-phase synchronous elevators according to claim 5, characterized in that, The control module includes: A microcontroller is used to execute control logic and generate enable signals; The signal processing module includes: a first transistor (Q1), a second transistor (Q2), and a third transistor (Q3), wherein: The base of the first transistor (Q1) is connected to the microcontroller via the first diode (D1) to input an enable signal, and is connected to the negative terminal of the rectifier input via the first resistor (R1); its collector is connected to the positive terminal of the rectifier output via the second resistor (R2); and its emitter is connected to the negative terminal of the rectifier output via the third resistor (R3) to reverse the enable signal. The emitter of the second transistor (Q2) is connected to the positive terminal of the rectified output through the fourth resistor (R4), and its base is connected to the collector of the first transistor (Q1) to amplify the reverse enable signal. The base of the third transistor (Q3) is connected to the collector of the second transistor (Q2) through the fifth resistor (R5), and is connected to the positive terminal of the rectifier output through the first Zener diode (DZ1). Its collector is connected to the positive terminal of the rectifier output, and its emitter controls the opening and closing of the first switch (K1) and the second switch (K2) connected in parallel. Meanwhile, the negative terminal of the rectified output is connected to the emitter of the third transistor through the third diode (D3).

10. The passive electronic star-sealing device for a three-phase synchronous elevator according to any one of claims 1 to 9, characterized in that, The switching power supply includes: an input filtering unit, a switching power supply chip XD308H, a feedback-power supply coupling regulation unit, a current limiting monitoring unit, and an output filtering and dual-channel protection unit; wherein: The input filtering unit includes a second inductor (L2), a fourth capacitor (C4), and a fifth capacitor (C5). The second inductor (L2) is connected in series between the input power supply and the drain input terminal of the switching power supply chip (XD308H). The fourth capacitor (C4) and the fifth capacitor (C5) are connected in parallel on the input side of the second inductor (L2) to suppress spikes and filter high frequencies of input energy under a wide range of input voltage conditions. The switching power supply chip (XD308H) includes four drain terminal pins (DRain), power supply pins (VDD / BP), feedback pins (FB), ground pins (GND / S), and current monitoring pins (CS) arranged in parallel. Multiple drain terminal pins (DRain) are directly connected to the output of the input filtering unit to achieve direct energy acquisition when the input voltage varies widely. The feedback-power supply coupling adjustment unit includes a first capacitor (C1), a first resistor (R1), and a second resistor (R2). The first capacitor (C1) is connected between the power supply pin (VDD / BP) and the feedback pin (FB) to couple and adjust the internal power supply and feedback signal of the chip during startup and steady-state phases. The first resistor (R1) and the second resistor (R2) are connected in series between the output terminal and the ground pin (GND / S), and their voltage divider node is connected to the feedback pin (FB) so that the output voltage information is fed back to the chip after voltage division, realizing closed-loop adjustment based on the output voltage, and forming dynamic compensation for the power supply pin (VDD / BP) through the first capacitor (C1). The current limiting monitoring unit includes a third resistor (R3), which is connected in series between the ground pin (GND / S) and the current monitoring pin (CS) to convert the current flowing through the chip into a monitoring voltage signal and input it to the current monitoring pin (CS), thereby achieving current limiting under wide input voltage conditions. The output filtering and dual-channel protection unit includes a first inductor (L1), a second capacitor (C2), a third capacitor (C3), a first diode (D1), a second diode (D2), and a fourth resistor (R4). The first inductor (L1) is connected in series between the ground pin (GND / S) and the output terminal to store and smooth the output current. The second capacitor (C2) is connected between the ground pin (GND / S) and ground, and the third capacitor (C3) is connected between the output terminal and ground to filter the output voltage. The first diode (D1) is connected between the output terminal and the ground pin (GND / S) to form a first clamping path, and the second diode (D2) is connected between the ground pin (GND / S) and ground to form a second clamping path, so as to provide dual-path clamping protection for the voltage under different operating conditions. The fourth resistor (R4) is connected between the output terminal and ground to form a minimum load and provide a discharge path. The input filtering unit, the feedback-power supply coupling adjustment unit, the current limiting monitoring unit, and the output filtering and dual-channel protection unit work together to enable the switching power supply chip (XD308H) to achieve stable output over a wide input voltage range.

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