Elevator and control circuit, control method and computer storage medium thereof

Abstract

This application discloses an elevator control circuit, an elevator control method, an elevator, and a computer storage medium. The elevator control circuit includes a frequency converter module, a safety torque shutdown module, a safety circuit module, and a star-sealing module. The frequency converter module includes a driver and an inverter. The inverter includes a first bridge arm and a second bridge arm, both of which are connected to the driver. The safety torque shutdown module is connected in series between the driver and the first bridge arm. The safety circuit module is connected to the safety torque shutdown module. The star-sealing module is connected to the driver and also to the second bridge arm. When the elevator stops, the safety circuit module controls the safety torque shutdown module to shut down, thereby limiting the driver from sending drive signals to the first bridge arm. The driver sends a star-sealing signal to the star-sealing module, causing the star-sealing module to control the second bridge arm to star-seale, thus eliminating the need for the main contactor and the star-sealing contactor, and avoiding the noise generated when the main contactor and the star-sealing contactor operate.

Description

Technical Field

[0001] This application relates to the field of elevator technology, and more specifically, to an elevator and its control circuit, control method, and computer storage medium. Background Technology

[0002] According to the type test specifications released in 2022, elevator systems are required to be equipped with a star-locking braking technology. In related technical fields, most systems use a main contactor to achieve the safe torque shutdown of the traction machine and a star-locking contactor to achieve the star-locking of the traction machine. However, both the main contactor and the star-locking contactor generate significant noise during each operation, resulting in a poor elevator riding experience. Summary of the Invention

[0003] This application provides an elevator and its control circuit, control method, and computer storage medium, which aims to achieve the shut-off of the safety torque of the traction machine and the sealing of the traction machine through the elevator control circuit, thereby eliminating the need for the main contactor and the sealing contactor, and thus avoiding the noise generated when the main contactor and the sealing contactor operate.

[0004] This application provides an elevator control circuit, including a frequency converter module, a safety torque shutdown module, a safety loop module, and a star-sealing module. The frequency converter module includes a driver and an inverter. The inverter includes a first bridge arm and a second bridge arm, both of which are connected to the driver. The safety torque shutdown module is connected in series between the driver and the first bridge arm. The safety loop module is connected to the safety torque shutdown module and is used to control the on / off state of the safety torque shutdown module. The star-sealing module is connected to the driver and also to the second bridge arm. When the elevator stops, the safety loop module controls the safety torque shutdown module to shut down, thereby limiting the driver from sending drive signals to the first bridge arm. The driver then sends a star-sealing signal to the star-sealing module, causing the star-sealing module to control the second bridge arm to star-seale.

[0005] Based on the above embodiments, when the elevator is moving, the safety circuit module controls the safety torque shutdown module to remain on, allowing the driver to send drive signals to the first and second bridge arms to control the inverter output power, thereby controlling the traction machine's speed. When the elevator stops, under the control of the safety circuit module, the driver stops sending drive signals to the first and second bridge arms, and the safety circuit module controls the safety torque shutdown module to turn off, thus disconnecting the driver from the first bridge arm. This further restricts the driver from sending drive signals to the first bridge arm, ensuring that the first bridge arm is in a turned-off state. Then, the driver sends a star-sealing signal to the star-sealing module, causing the star-sealing module to control the three switches in the second bridge arm to turn on and form a star connection, thereby achieving star-sealing of the traction machine, i.e., controlling the traction machine through electricity. The elevator control circuit can shut off the safety torque of the traction machine and lock the traction machine, thus eliminating the need for main contactors and lock contactors, thereby avoiding the noise generated when the main contactors and lock contactors operate. Furthermore, by eliminating the use of main contactors and lock contactors, problems such as aging, corrosion, and oxidation that occur during long-term use can be avoided, reducing elevator maintenance costs. Moreover, as elevator power increases, the cost of using main contactors and lock contactors will gradually increase, while replacing them with elevator control circuits can effectively reduce costs.

[0006] In some embodiments, the safety loop module includes a safety circuit and a main controller. The safety circuit is connected to the safety torque shutdown module and the driver. The main controller is connected to the driver via a bus and to the safety circuit for controlling the on / off state of the safety circuit and for monitoring the on / off state of the safety circuit. When at least one of the main controller and the driver sends a first shutdown signal to the safety circuit, the safety circuit is turned off, thereby turning off the safety torque shutdown module.

[0007] Based on the above embodiments, when the elevator car stops, the main controller controls the driver to stop sending drive signals. Then, the main controller and at least one of the drivers send a first shutdown signal to the safety circuit, causing the safety circuit to shut down, thereby shutting down the safety torque shutdown module. This further restricts the driver from sending drive signals to the first bridge arm. Then, the driver sends a star-sealing signal to the star-sealing module, causing the star-sealing module to control the three switches in the second bridge arm to conduct and form a star connection, thus realizing the star-sealing of the traction machine. By controlling the safety circuit to shut down the safety torque shutdown module, the driver and the first bridge arm can be physically shut down on the basis of the driver stopping sending drive signals. This provides double protection, ensuring that when the driver sends a star-sealing signal to the star-sealing module and the star-sealing module controls the three switches in the second bridge arm to conduct and form a star connection, the three switches in the first bridge arm are turned off, preventing short circuits in the inverter and preventing the inverter from burning out, thus giving the inverter a longer service life.

[0008] In some embodiments, the safety circuit includes a first safety switch and a first logic circuit. The first safety switch is connected to a safety torque shutdown module. The first logic circuit is connected to the first safety switch and to the main controller and the driver, and is used to control the first safety switch to shut down according to a first shutdown signal, so as to shut down the safety circuit.

[0009] Based on the above embodiments, when at least one of the main controller and the driver sends a first shutdown signal to the first logic circuit, the first logic circuit controls the first safety switch to turn off, thereby turning off the safety circuit and thus turning off the safety torque shutdown module; when both the main controller and the driver send a conduction signal to the first logic circuit, the first logic circuit controls the first safety switch to conduct, thereby turning on the safety circuit and thus turning on the safety torque shutdown module.

[0010] In some embodiments, the safety circuit further includes a second safety switch and a second logic circuit. The second safety switch is connected in series with the first safety switch and connected to the safety torque shutdown module. The second logic circuit is connected to the second safety switch and to the driver, and is used to control the second safety switch to shut down according to the second shutdown signal triggered by the star-sealing signal.

[0011] Based on the above embodiments, when the driver sends a star-sealing signal to the star-sealing module, the star-sealing module controls the three switching transistors in the second bridge arm to conduct according to the star-sealing signal, so that the traction machine is star-sealed. At the same time, the second logic circuit also controls the second safety switch to turn off according to the star-sealing signal. In this way, the second safety switch can be turned off on the basis of the first safety switch being open, so as to achieve double protection and ensure that the safety circuit is turned off, so as to ensure that the three switching transistors in the first bridge arm are turned off, and thus the three switching transistors in the second bridge arm are turned on, so that when the traction machine is star-sealed, the inverter is prevented from short-circuiting, so that the frequency converter module has a longer service life.

[0012] In some embodiments, the driver includes a drive signal output terminal and a star-blocking signal output terminal, and the frequency converter module also includes a buffer connected to both the drive signal output terminal and the star-blocking signal output terminal, and connected to a safety torque shutdown module for limiting the driver from sending drive signals to the first bridge arm and the second bridge arm according to the star-blocking signal sent by the driver.

[0013] Based on the above embodiments, when the driver sends a star-sealing signal to the star-sealing module, the buffer restricts the driver from sending drive signals to the first and second bridge arms according to the star-sealing signal. This prevents the three switches in the second bridge arm from turning on independently when the traction machine is star-sealed, thus preventing a short circuit in the inverter. When the driver sends a star-unsealing signal to the star-sealing module, the buffer allows the driver to send drive signals to the first and second bridge arms according to the star-unsealing signal. This allows the driver to send drive signals to the first and second bridge arms when the safety torque shutdown module is turned on, enabling the inverter to drive the elevator's traction machine.

[0014] In some embodiments, the safety torque shutdown module includes a switching circuit and a safety torque shutdown controller. The switching circuit is connected in series between the driver and the first bridge arm and is connected to the safety loop module. When the safety loop module is turned off, the switching circuit is turned off. The safety torque shutdown controller is used to monitor the on / off state of the switching circuit and is connected to the driver via a bus. When the driver receives a feedback signal from the safety torque shutdown controller indicating that the switching circuit is in the off state, the driver sends a star-sealing signal to the star-sealing module.

[0015] Based on the above embodiments, when the safety loop module is turned off, the switching circuit is turned off, thereby disconnecting the driver from the first bridge arm. This restricts the driver from sending drive signals to the first bridge arm, keeping the first bridge arm in an open state. Only when the driver receives a feedback signal from the safety torque shutdown controller indicating that the switching circuit is in an open state will the driver send a star-sealing signal to the star-sealing module to prevent the star-sealing module from star-sealing the second bridge arm when the first bridge arm is in a conducting state, thereby preventing the inverter from short-circuiting.

[0016] In some embodiments, the switching circuit includes a first switching element and a second switching element, which are connected in series between the driver and the first bridge arm. Both the first and second switching elements are connected to the safety loop module. When the safety loop module is turned off, both the first and second switching elements are turned off.

[0017] Based on the above embodiments, when the safety circuit module is turned off, both the first and second switching elements are turned off. Compared to a solution where only one switching element (e.g., only the first or second switching element) is present and the single switching element is in an abnormal state, resulting in failure to turn off, the probability of both switching elements (i.e., the first and second switching elements) being in an abnormal state simultaneously and failing to turn off is lower. This allows the first and second switching elements to form a double protection between the driver and the first bridge arm, ensuring that the driver and the first bridge arm are in a turned-off state when the safety circuit module is turned off, thus ensuring that the first bridge arm is in a turned-off state. Consequently, when the star-sealing module controls the three switching transistors in the second bridge arm to conduct, the inverter is prevented from short-circuiting when the traction machine is star-sealed.

[0018] In some embodiments, the elevator control circuit also includes an encoder connected to the drive and for connecting to the traction machine to monitor the speed of the traction machine and feed it back to the drive.

[0019] Based on the above embodiments, when the elevator stops abnormally, before the driver sends the star-sealing signal to the star-sealing module, it first obtains the rotation speed of the traction machine from the encoder. When the rotation speed of the traction machine is lower than the preset speed, it then sends the star-sealing signal to the star-sealing module to prevent the star from being sealed when the traction machine is rotating at high speed. This reduces the current generated during the star-sealing process, reduces damage to the traction machine and inverter, and ensures that both the traction machine and inverter have a longer service life.

[0020] This application also provides an elevator control method, applicable to elevator control circuits, the elevator control method including:

[0021] The safety circuit module is shut down to cause the safety torque shutdown module to shut down.

[0022] Based on the feedback signal that the safety torque shutdown module is in the off state, the control driver sends a star-sealing signal to the star-sealing module, so that the star-sealing module controls the second bridge arm of the inverter to star-seale.

[0023] In some embodiments, the safety loop module includes a main controller and a first safety switch. The step of controlling the safety loop module to shut down, thereby shutting down the safety torque shutdown module, includes:

[0024] At least one of the main controller and the driver sends a first shutdown signal to the first safety switch to control the first safety switch to shut down, thereby shutting down the safety torque shutdown module.

[0025] In some embodiments, the step of controlling the driver to send a star-sealing signal to the star-sealing module simultaneously with or before executing the feedback signal that the safety torque shutdown module is in the off state also includes:

[0026] A second shutdown signal, triggered by a star-blocking signal sent by the driver to the first safety switch, keeps the first safety switch off; and / or,

[0027] The frequency converter module also includes a buffer, and simultaneously or before the step of controlling the driver to send a star-sealing signal to the star-sealing module based on the feedback signal that the safe torque shutdown module is in the off state, it also includes:

[0028] The control buffer restricts the driver from sending drive signals to the first and second bridge arms.

[0029] In some embodiments, the safety loop module includes a main controller, a first safety switch, and a second safety switch connected in series with the first safety switch;

[0030] The steps for controlling the safety circuit module to shut down, thereby shutting down the safety torque shutdown module, include:

[0031] The first safety switch is turned off by sending a first shutdown signal to the first safety switch through at least one of the main controller and the driver, so as to turn off the safety torque shutdown module.

[0032] The step of sending a star-sealing signal to the star-sealing module simultaneously with or before executing the feedback signal that the safety torque shutdown module is in the off state, and controlling the driver to do so, also includes:

[0033] A second shutdown signal is triggered by sending a star-blocking signal to the second safety switch via the driver, thereby turning off the second safety switch; and / or,

[0034] The frequency converter module also includes a buffer, and simultaneously or before the step of controlling the driver to send a star-sealing signal to the star-sealing module based on the feedback signal that the safe torque shutdown module is in the off state, it also includes:

[0035] The control buffer restricts the driver from sending drive signals to the first and second bridge arms.

[0036] In some embodiments, the elevator control circuit also includes an encoder, and the step of controlling the driver to send a star-sealing signal to the star-sealing module includes:

[0037] Obtain the encoder information output by the encoder, and obtain the speed of the elevator traction machine based on the encoder information;

[0038] Based on the condition that the rotational speed is less than the preset rotational speed, the control driver sends a star-sealing signal to the star-sealing module.

[0039] In some embodiments, prior to the step of controlling the safety circuit module to shut down, thereby causing the safety torque shutdown module to shut down, the elevator control method further includes:

[0040] The control driver stops outputting drive signals to the first and second arms of the inverter.

[0041] This application also provides an elevator control method, applicable to elevator control circuits, the elevator control method including:

[0042] The control driver sends a star-freeze signal to the star-freeze module, so that the star-freeze module can release the star-freeze state of the second bridge arm;

[0043] The safety circuit module is activated so that the safety torque shutdown module is activated.

[0044] In some embodiments, the safety loop module includes a main controller and a first safety switch. The step of controlling the safety loop module to turn on, so as to turn on the safety torque shutdown module, includes:

[0045] Both the driver and the main controller send a first conduction signal to the first safety switch to control the first safety switch to conduct, so that the safety circuit module conducts, thereby enabling the safety torque shutdown module to conduct.

[0046] In some embodiments, the step of sending a release signal to the satellite blocking module by the execution control driver may be performed simultaneously or after the following:

[0047] Control the buffer contact limit so that the driver can send drive signals to the first bridge arm and the second bridge arm.

[0048] In some embodiments, the safety loop module includes a main controller, a first safety switch, and a second safety switch connected in series with the first safety switch;

[0049] The steps for controlling the safety circuit module to turn on, so that the safety torque shutdown module turns on, include:

[0050] Both the driver and the main controller send a first conduction signal to the first safety switch to control the first safety switch to conduct, thereby turning on the safety circuit module and thus turning on the safety torque shutdown module.

[0051] The execution control driver sends a star-unsealing signal to the star-sealing module, so that the star-sealing module unseales the second bridge arm, and at the same time or afterward, it also includes:

[0052] A second turn-on signal, triggered by sending a star-unsealing signal to the second safety switch via the driver, is used to control the second safety switch to turn on; and / or,

[0053] The frequency converter module also includes a buffer, and executes the control driver to send a release signal to the star-sealing module so that the star-sealing module releases the star-sealing state of the second bridge arm at the same time or afterward.

[0054] The control buffer is unrestricted so that the driver can send drive signals to the first and second bridge arms.

[0055] In some embodiments, after the step of controlling the safety loop module to turn on so as to turn on the safety torque shutdown module, the method further includes:

[0056] Based on the feedback signal that the safety torque shutdown module is in the on state, the control driver sends drive signals to the first and second bridge arms of the inverter so that the inverter drives the elevator's traction machine to work.

[0057] This application also provides an elevator, including an elevator control circuit, or steps for executing a control method.

[0058] This application also provides a computer storage medium that stores multiple instructions adapted for loading and executing the steps of an elevator control method by a processor.

[0059] Based on this application, an elevator, its control circuit, control method, and computer storage medium are disclosed. When the elevator stops, the driver stops sending drive signals to the first and second bridge arms. The safety circuit module controls the safety torque shutdown module to shut down, thereby disconnecting the driver from the first bridge arm and further restricting the driver from sending drive signals to the first bridge arm to ensure that the first bridge arm is in the off state. Then, the driver sends a star-sealing signal to the star-sealing module, so that the star-sealing module controls the three switching transistors in the second bridge arm to conduct and short-circuit, thereby realizing the star-sealing function of the elevator. The star-sealing process does not require the use of the main contactor and the star-sealing contactor, thus avoiding the noise generated when the main contactor and the star-sealing contactor operate. Attached Figure Description

[0060] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 This is a schematic diagram of the elevator structure in one embodiment of this application;

[0062] Figure 2 This is a schematic diagram of the elevator control circuit in one embodiment of this application;

[0063] Figure 3 This is a circuit diagram of an elevator control circuit in one embodiment of this application;

[0064] Figure 4 This is a circuit diagram of the elevator control circuit in another embodiment of this application;

[0065] Figure 5 This is a flowchart illustrating an elevator control method in one embodiment of this application;

[0066] Figure 6 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0067] Figure 7 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0068] Figure 8 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0069] Figure 9 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0070] Figure 10 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0071] Figure 11 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0072] Figure 12 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0073] Figure 13 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0074] Figure 14This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0075] Figure 15 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0076] Figure 16 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0077] Figure 17 This is a flowchart illustrating the elevator control method in another embodiment of this application;

[0078] Figure 18 This is a flowchart illustrating the elevator control method in another embodiment of this application.

[0079] Explanation of reference numerals in the attached diagram: 1. Elevator; 11. Traction machine; 12. Cable; 13. Car; 14. Counterweight; 15. Elevator control circuit; 151. Variable frequency module; 1511. Driver; 1511A. Drive signal output terminal; 1511B. Star-lock signal output terminal; 1512. Buffer; 1513. Inverter; 1513A. First bridge arm; 1513B. Second bridge arm; 1514. Rectifier; 152. Safety torque shutdown module; 1521. Switching circuit; STO-1. First switching element; STO-2. Second switching element; 1522. Safety torque shutdown controller; 153. Safety loop module; 1531. Safety circuit; Q1. First safety switch; L1. First logic circuit; Q2. Second safety switch; L2. Second logic circuit; 1532. Main controller; 154. Star-lock module; 155. Encoder. Detailed Implementation

[0080] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0081] Please refer to Figure 1 and Figure 2 This application provides an elevator 1, which includes a traction machine 11, a cable 12, a car 13, a counterweight 14, and an elevator control circuit 15.

[0082] The traction machine 11 is used to output power, thereby driving the car 13 and the counterweight 14 to move via the cable 12. The traction machine 11 can be a permanent magnet synchronous traction machine.

[0083] The cable 12 is used to connect the car 13 and the counterweight 14, and is connected to the traction machine 11 through a pulley block. The cable 12 is usually a steel wire rope with multiple strands to improve safety performance and increase the connection stability between the car 13, the counterweight 14 and the traction machine 11.

[0084] The car 13 is used to carry people and goods, and one end of the car 13 is connected to the cable 12.

[0085] The counterweight 14 is used to balance part of the weight of the car 13. The counterweight 14 is connected to the end of the cable 12 away from the car 13. When the traction machine 11 drives the car 13 upward, the counterweight 14 moves downward; when the traction machine 11 drives the car 13 downward, the counterweight 14 moves upward.

[0086] The elevator control circuit 15 is used to control the operation and stop of the traction machine 11.

[0087] It is understood that elevator 1 also includes multiple detection sensors, including position sensors. For example, after elevator control circuit 15 controls traction machine 11 to move car 13 to the target floor according to operation instructions, position sensor can send position signal to elevator 1 control system to stop traction machine 11 from rotating, so that car 13 can stay at the target floor, thereby improving the running accuracy of car 13.

[0088] Please refer to Figure 1 and Figure 2 In one specific embodiment, the elevator control circuit 15 includes a frequency converter module 151, a safe torque off (STO) module 152, a safety loop module 153, and a star-sealing module 154.

[0089] The frequency converter module 151 is used to connect to AC power, rectify and filter the AC power into DC power, and then invert the DC power back into AC power. This allows the frequency converter module 151 to adjust the output power according to the working power required by the traction machine 11, thereby achieving energy-saving operation of the traction machine 11 and speed regulation of the traction machine 11. For example, the frequency converter module 151 includes a driver 1511, a rectifier 1514, and an inverter 1513. The rectifier 1514 is connected to the inverter 1513. The rectifier 1514 is used to rectify the AC power connected to the frequency converter module 151 to output DC power. The DC power enters the inverter 1513, and under the control of the driver 1511, it outputs AC power. Specifically, the inverter 1513 includes a first bridge arm 1513A and a second bridge arm 1513B. Both the first bridge arm 1513A and the second bridge arm 1513B are connected to the driver 1511. Both the first bridge arm 1513A and the second bridge arm 1513B include three switching transistors to switch between on and off states according to the drive signal sent by the driver 1511. For example, the drive signal can be a pulse width modulation (PWM) signal. When the traction machine 11 is a three-phase permanent magnet synchronous traction machine, the drive signal sent by the driver 1511 includes six drive signals, including two U-phase drive signals, two V-phase drive signals and two W-phase drive signals. One U-phase drive signal, one V-phase drive signal and one W-phase drive signal are sent to the three switches of the first bridge arm 1513A, and another U-phase drive signal, another V-phase drive signal and another W-phase drive signal are sent to the three switches of the second bridge arm 1513B to control the on / off of the corresponding switches in the first bridge arm 1513A and the corresponding switches in the second bridge arm 1513B.

[0090] The safety torque shutdown module 152 is connected in series between the driver 1511 and the first bridge arm 1513A. When the safety torque shutdown module 152 is turned on, the driver 1511 and the first bridge arm 1513A are connected, so that the driver 1511 can send a drive signal to the first bridge arm 1513A to control the on and off of the first bridge arm 1513A. When the safety torque shutdown module 152 is turned off, the driver 1511 and the first bridge arm 1513A are disconnected, thereby limiting the driver 1511 from sending a drive signal to the first bridge arm 1513A.

[0091] Understandably, the safety torque shutdown module 152 can also be connected in series between the driver 1511 and the first bridge arm 1513A and the second bridge arm 1513B. When the safety torque shutdown module 152 is turned on, the driver 1511 is turned on with both the first bridge arm 1513A and the second bridge arm 1513B, thereby enabling the driver 1511 to send drive signals to the first bridge arm 1513A and the second bridge arm 1513B to control the on / off state of the first bridge arm 1513A and the second bridge arm 1513B. When the safety torque shutdown module 152 is turned off, the driver 1511 is turned off with both the first bridge arm 1513A and the second bridge arm 1513B, thereby limiting the driver 1511 from sending drive signals to the first bridge arm 1513A and the second bridge arm 1513B.

[0092] Safety circuit module 153 is connected to safety torque circuit module 152 and is used to control the on / off state of safety torque shutdown module 152. When safety circuit module 153 is off, safety torque shutdown module 152 is also off accordingly; when safety circuit module 153 is on, safety torque shutdown module 152 is also on accordingly.

[0093] The star-sealing module 154 is connected to the driver 1511 and the second bridge arm 1513B. It controls the three switching transistors in the second bridge arm 1513B to conduct according to the star-sealing signal sent by the driver 1511, thereby sealing the traction machine 11. The star-sealing module 154 can be any circuit module capable of turning on each of the three switching transistors in the second bridge arm 1513B and forming a star connection, thus short-circuiting the three-phase windings of the traction machine 11.

[0094] In this embodiment of the application, when elevator 1 is moving, safety circuit module 153 controls safety torque shutdown module 152 to remain on, so that driver 1511 can send drive signals to first bridge arm 1513A and second bridge arm 1513B to control the output power of inverter 1513, thereby controlling the speed of traction machine 11.

[0095] When elevator 1 stops, under the control of safety circuit module 153, driver 1511 stops sending drive signals to first bridge arm 1513A and second bridge arm 1513B, and safety circuit module 153 controls safety torque shutdown module 152 to shut down, thereby disconnecting driver 1511 from first bridge arm 1513A, further restricting driver 1511 from sending drive signals to first bridge arm 1513A, that is, further ensuring that driver 1511 cannot send drive signals to first bridge arm 1513A, ensuring that first bridge arm 1513A is in the off state. Then driver 1511 sends a star-sealing signal to star-sealing module 154, so that star-sealing module 154 controls the three switching transistors in second bridge arm 1513B. Each component is connected and forms a star connection, thereby achieving star-sealing of the traction machine 11. That is, the elevator control circuit 15 can realize the shutdown of the safety torque of the traction machine 11 and the star-sealing of the traction machine 11, thus eliminating the need for the main contactor and the star-sealing contactor, thereby avoiding the noise generated when the main contactor and the star-sealing contactor operate. Furthermore, since the main contactor and the star-sealing contactor are not used, problems such as aging, corrosion and oxidation of the main contactor and the star-sealing contactor during long-term use can be avoided, reducing the maintenance cost of elevator 1. Furthermore, as the power of elevator 1 increases, the cost of using the main contactor and the star-sealing contactor will gradually increase, while replacing them with elevator control circuit 15 can effectively reduce costs.

[0096] For example, elevator 1 may stop after the position sensor detects that the car 13 has moved to the target floor. Of course, elevator 1 may also stop abnormally due to at least one of the frequency converter module 151, safety torque shutdown module 152, safety circuit module 153, and star-sealing module 154 malfunctioning.

[0097] When elevator 1 receives a start signal (which includes both an elevator up signal and an elevator down signal), the driver 1511 sends a release signal to the star-locking module 154, causing the star-locking module 154 to control the three switches in the second bridge arm 1513B to turn off, thereby releasing the star lock on the traction machine 11. Then, the safety circuit module 153 controls the safety torque shutdown module 152 to turn on, thereby enabling the driver 1511 to connect with the first bridge arm 1513A. The safety circuit module 153 then controls the driver 1511 to send drive signals to the first bridge arm 1513A and the second bridge arm 1513B, thereby driving the traction machine 11 to work and move the car 13.

[0098] Understandably, the safety torque shutdown module 152 can also be connected in series between the driver 1511 and the second bridge arm 1513B. The star-sealing module 154 is connected to the driver 1511 and the first bridge arm 1513A. Thus, when the elevator stops, the safety circuit module 153 controls the safety torque shutdown module 152 to shut down, thereby shutting down the connection between the driver 1511 and the second bridge arm 1513B. Then, the driver 1511 sends a star-sealing signal to the star-sealing module 154, so that the star-sealing module 154 controls the three switching tubes in the first bridge arm 1513A to conduct and form a star connection. Similarly, the traction machine 11 can also be star-sealed.

[0099] Please refer to Figure 2-4 In one specific embodiment, the safety loop module 153 includes a safety circuit 1531 and a main controller 1532. The safety circuit 1531 is connected to the safety torque shutdown module 152 and the driver 1511. One end of the safety circuit 1531 away from the safety torque shutdown module 152 is connected to a DC power supply. When the safety circuit 1531 is on, the DC power supply voltage can enter the safety torque shutdown module 152, causing the safety torque shutdown module 153 to turn on. When the safety circuit 1531 is off, the safety torque shutdown module 152 loses power and shuts down. For example, the DC power supply voltage can be 12V or 48V; in this embodiment, the DC power supply voltage is not specifically limited.

[0100] The main controller 1532 is connected to the driver 1511 via a bus and also to the safety circuit 1531. It is used to control the on / off state of the safety circuit 1531 and to monitor its status. For example, the main controller 1532 can be connected to the driver 1511 via a BUS (public communication trunk line) to enable data exchange between them. For example, the BUS can be a CAN (Controller Area Network) bus connected to the driver 1511.

[0101] When elevator car 13 stops, the main controller 1532 controls the driver 1511 to stop sending drive signals. Then, at least one of the main controller 1532 and the driver 1511 sends a shutdown signal to the safety circuit 1531, causing the safety circuit 1531 to shut down. This shuts down the safety torque shutdown module 152, further restricting the driver 1511 from sending drive signals to the first bridge arm 1513A. Then, the driver 1511 sends a star-sealing signal to the star-sealing module 154, causing the star-sealing module 154 to control the three switching transistors in the second bridge arm 1513B to turn on and form a star connection, thereby achieving star-sealing of the traction machine 11. This is achieved by controlling the safety circuit... The shutdown of circuit 1531 causes the safety torque shutdown module 152 to shut down. This allows the driver 1511 to be physically shut down from the first bridge arm 1513A, provided that the driver 1511 stops sending drive signals. This provides dual protection, ensuring that when the driver 1511 sends a star-sealing signal to the star-sealing module 154, and the star-sealing module 154 controls the three switches in the second bridge arm 1513B to turn on and form a star connection, the three switches in the first bridge arm 1513A remain off. This prevents the inverter 1513 from short-circuiting and burning out, thus extending the service life of the inverter 1513.

[0102] For example, the shutdown signal controlling the safety circuit 1531 to shut down can be a shutdown signal sent by the main controller 1532 to the safety circuit 1531 when the main controller 1532 detects an abnormality in at least one of the frequency converter module 151, the safety torque shutdown module 152, the safety loop module 153, and the star-sealing module 154. For example, the shutdown signal controlling the safety circuit 1531 to shut down can also be a shutdown signal sent by the driver 1511 to the safety circuit 1531 when the driver 1511 detects an abnormality in the frequency converter module 151.

[0103] When the main controller 1532 receives the start signal, it controls the driver 1511 to send a release signal to the star-sealing module 154, so that the star-sealing module 154 controls the three switches in the second bridge arm 1513B to turn off. Then, when the driver 1511 detects that the three switches in the second bridge arm 1513B are turned off, and the main controller 1532 detects that there are no abnormalities in the safety torque shutdown module 152, the safety circuit module 153, and the star-sealing module 154, both the main controller 1532 and the driver 1511 send a conduction signal to the safety circuit 1531 to control the safety circuit 1531 to conduct, so that the safety torque shutdown module 152 conducts, thereby making the driver 1511 conduct with the first bridge arm 1513A. Then, the driver 1511 sends a drive signal to the first bridge arm 1513A and the second bridge arm 1513B, so that the traction machine 11 can work to drive the car 13 to move.

[0104] Please refer to Figure 3 In one specific embodiment, the safety circuit 1531 includes a first safety switch Q1 and a first logic circuit L1. The first safety switch Q1 is connected to the safety torque shutdown module 152; the first logic circuit L1 is connected to the first safety switch Q1 and to the main controller 1532 and the driver 1511. For example, when at least one of the main controller 1532 and the driver 1511 sends a first shutdown signal to the first logic circuit L1, the first logic circuit L1 controls the first safety switch Q1 to turn off, causing the safety circuit 1531 to shut down, thereby causing the safety torque shutdown module 152 to shut down.

[0105] For example, when both the main controller 1532 and the driver 1511 send a first turn-on signal to the first logic circuit L1, the first logic circuit L1 controls the first safety switch Q1 to turn on, causing the safety circuit 1531 to turn on, thereby causing the safety torque shutdown module 152 to turn on, so that the driver 1511 sends drive signals to the first bridge arm 1513A and the second bridge arm 1513B of the inverter 1513, so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work. For example, the first safety switch Q1 may be, but is not limited to, at least one of a bipolar junction transistor (BJT), a metal oscillator (MOS), an electromagnetic relay, and an insulated gate bipolar transistor (IGBT). In the embodiments of this application, the specific form of the first safety switch Q1 is not limited.

[0106] Please refer to Figure 4In one specific embodiment, the safety circuit 1531 further includes a second safety switch Q2 and a second logic circuit L2. The second safety switch Q2 is connected in series with the first safety switch Q1 and connected to the safety torque shutdown module 152. The second logic circuit L2 is connected to the second safety switch Q2 and to the driver 1511, and is used to control the second safety switch Q2 to shut down according to the second shutdown signal triggered by the star-sealing signal sent by the driver 1511. When the driver 1511 sends a star-sealing signal to the star-sealing module 154, the star-sealing module 154 controls the three switching transistors in the second bridge arm 1513B to conduct according to the star-sealing signal, so that the traction machine 11 is star-sealed. At the same time, the second logic circuit L2 also controls the second safety switch Q2 to turn off according to the second shutdown signal triggered by the star-sealing signal. In this way, the second safety switch Q2 can be turned off on the basis of the first safety switch Q1 being open, so as to achieve double protection and ensure that the safety circuit 1531 is turned off, so that the three switching transistors in the first bridge arm 1513A are turned off respectively, and the three switching transistors in the second bridge arm 1513B are turned on respectively. When the traction machine 11 is star-sealed, the inverter 1513 is prevented from short-circuiting, so that the frequency converter module 151 has a longer service life.

[0107] When the driver 1511 sends a star-off signal to the star-off module 154, the star-off module 154 controls the three switches in the second bridge arm 1513B to turn off, so that the traction machine 11 is released from star-off. At the same time, the second logic circuit L2 also controls the second safety switch Q2 to turn on according to the second conduction signal triggered by the star-off signal. After the driver 1511 detects that the second bridge arm 1513B is in the off state and the main controller 1532 detects that the second safety switch Q2 is on, the main controller 1532 and the driver 1511 both send a first conduction signal to the first logic circuit L1, so that the first logic circuit L1 controls the first safety switch Q1 to turn on, so that the safety circuit 1531 is turned on, thereby turning on the safety torque shutdown module 152.

[0108] For example, the second safety switch Q2 may be, but is not limited to, at least one of a transistor, a field-effect transistor, an electromagnetic relay, and an insulated-gate bipolar transistor. In the embodiments of this application, the specific form of the second safety switch Q2 is not limited.

[0109] Please refer to Figure 3 and Figure 4In one specific embodiment, the driver 1511 includes a drive signal output terminal 1511A and a star-sealing signal output terminal 1511B. The inverter module 151 also includes a buffer 1512, which is connected to both the drive signal output terminal 1511A and the star-sealing signal output terminal 1511B, and is also connected to the safety torque shutdown module 152. When the driver 1511 sends a star-sealing signal to the star-sealing module 154, the buffer 1512, based on the star-sealing signal, restricts the driver 1511 from sending drive signals to the first bridge arm 1513A and the second bridge arm 1513B. This prevents the three switches in the second bridge arm 1513B from turning on when the traction machine 11 is star-sealed, thus preventing the inverter 1513 from short-circuiting. When the driver 1511 sends a release signal to the star-sealing module 154, the buffer 1512 enables the driver 1511 to send drive signals to the first bridge arm 1513A and the second bridge arm 1513B according to the release signal. This allows the driver 1511 to send drive signals to the first bridge arm 1513A and the second bridge arm 1513B when the safety torque shutdown module 152 is turned on, so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0110] Understandably, when the driver 1511 sends a star-blocking signal to the star-blocking module 154, the buffer 1512 restricts the driver 1511 from sending drive signals to the first bridge arm 1513A and the second bridge arm 1513B according to the disable signal; when the driver 1511 sends a star-unblocking signal to the star-blocking module 154, the buffer 1512 enables the driver 1511 to send drive signals to the first bridge arm 1513A and the second bridge arm 1513B according to the enable signal.

[0111] It is understandable that when elevator 1 stops, and the safety circuit 1531 includes the first safety switch Q1, and the frequency converter module 151 also includes the buffer 1512, the first safety switch Q1 can be turned off to turn off the safety torque shutdown module 152, thereby turning off the driver 1511 and the first bridge arm 1513A. The buffer 1512 can be used to limit the driver 1511 from sending drive signals to the first bridge arm 1513A and the second bridge arm 1513B, achieving double protection and ensuring that the three switches in the first bridge arm 1513A are in the off state.

[0112] Understandably, during the elevator 1 stop process, when the safety circuit 1531 includes the first safety switch Q1 and the second safety switch Q2, and the frequency converter module 151 also includes the buffer 1512, the safety torque shutdown module 152 can be shut off by simultaneously controlling the first safety switch Q1 and the second safety switch Q2 to shut off, thereby shutting off the driver 1511 and the first bridge arm 1513A. Furthermore, the buffer 1512 can be used to limit the driver 1511 from sending drive signals to the first bridge arm 1513A and the second bridge arm 1513B, achieving triple protection and ensuring that the three switches in the first bridge arm 1513A are in the off state.

[0113] Please refer to Figure 3 and Figure 4 In one specific embodiment, the safety torque shutdown module 152 includes a switching circuit 1521 and a safety torque shutdown controller 1522. The switching circuit 1521 is connected in series between the driver 1511 and the first bridge arm 1513A, and is connected to the safety loop module 153. The safety torque shutdown controller 1522 is used to monitor the on / off state of the switching circuit 1521, and is connected to the driver 1511 via a bus.

[0114] When the safety loop module 153 is turned off, the switching circuit 1521 is turned off, thereby disconnecting the driver 1511 from the first bridge arm 1513A. This limits the driver 1511 from sending drive signals to the first bridge arm 1513A, keeping the first bridge arm 1513A in the off state. Only when the driver 1511 receives a feedback signal from the safety torque shutdown controller 1522 indicating that the switching circuit 1521 is in the off state will the driver 1511 send a star-sealing signal to the star-sealing module 154 to prevent the star-sealing module 154 from star-sealing the second bridge arm 1513B when the first bridge arm 1513A is in the on state, thereby preventing the inverter 1513 from short-circuiting.

[0115] When the safety circuit module 153 is turned on, the switching circuit 1521 is turned on, so that the driver 1511 and the first bridge arm 1513A are connected, thereby enabling the driver 1511 to send a drive signal to the first bridge arm 1513A. When the driver 1511 receives a feedback signal from the safety torque shutdown controller 1522 indicating that the switching circuit 1521 is in the on state, the driver 1511 sends drive signals to the first bridge arm 1513A and the second bridge arm 1513B of the inverter 1513, so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0116] Please refer to Figure 3 and Figure 4In one specific embodiment, the switching circuit 1521 includes a first switching element STO-1 and a second switching element STO-2. The first switching element STO-1 and the second switching element STO-2 are connected in series between the driver 1511 and the first bridge arm 1513A. Both the first switching element STO-1 and the second switching element STO-2 are connected to the safety loop module 153. When the safety loop module 153 is turned off, both the first switching element STO-1 and the second switching element STO-2 are turned off. This is different from a circuit with only one switching element (e.g., only the first switching element STO-1 or the second switching element STO-2), where an abnormal state of a single switching element leads to… Without a shutdown scheme, the probability of both switching elements (i.e., the first switching element STO-1 and the second switching element STO-2) failing simultaneously and causing the shutdown to fail is low. This allows the first switching element STO-1 and the second switching element STO-2 to form a double guarantee between the driver 1511 and the first bridge arm 1513A, ensuring that when the safety circuit module 153 is shut down, the driver 1511 and the first bridge arm 1513A are in a shutdown state, ensuring that the first bridge arm 1513A is in a shutdown state. Then, when the star-sealing module 154 controls the three switching tubes in the second bridge arm 1513B to conduct, the inverter 1513 is prevented from short-circuiting when the traction machine 11 is star-sealed.

[0117] For example, the first switching element STO-1 and the second switching element STO-2 may be, but are not limited to, at least one of a transistor, a field-effect transistor, an electromagnetic relay, and an insulated-gate bipolar transistor. In the embodiments of this application, the specific form of the first switching element STO-1 and the second switching element STO-2 is not limited.

[0118] In some embodiments, the first switching element STO-1 is connected to the safety circuit 1531 via a first converter. The first converter converts the DC voltage signal into a control signal for controlling the first switching element STO-1 to turn on. Similarly, the second switching element STO-2 can be connected to the safety circuit 1531 via a second converter. The second converter converts the DC voltage signal into a control signal for controlling the second switching element STO-2 to turn on. This ensures that when the safety circuit module 153 is turned on, both the first converter and the second converter receive the DC voltage signal, so that the first converter controls the first switching element STO-1 to turn on, and the second converter controls the second switching element STO-2 to turn on, thereby turning on the switching circuit 1521.

[0119] Please refer to Figure 3 and Figure 4In the event of an abnormal elevator stop, or at the beginning of a normal elevator stop, directly controlling the three switching transistors in the first bridge arm 1513A to turn on the traction machine 11, or directly controlling the three switching transistors in the second bridge arm 1513B to turn on the traction machine 11, will generate a large current in the traction machine 11 and the corresponding bridge arm due to the high speed of the traction machine 11. This can easily burn out the switching transistors in the traction machine 11 or the corresponding bridge arm, thus affecting the service life of the elevator 1.

[0120] In one specific embodiment, the elevator control circuit 15 further includes an encoder 155, which is connected to the driver 1511 and used to connect to the traction machine 11 to monitor the rotational speed of the traction machine 11 and feed it back to the driver 1511. When the elevator 1 stops abnormally, before the driver 1511 sends a star-sealing signal to the star-sealing module 154, it first obtains the corresponding encoder signal from the encoder 155 to obtain the rotational speed of the traction machine 11. When the rotational speed of the traction machine 11 obtained by the driver 1511 is less than the preset speed, the driver 1511 then sends a star-sealing signal to the star-sealing module 154, thereby preventing the star-sealing from occurring during the high-speed rotation of the traction machine 11, reducing the current generated during star-sealing, reducing the damage of the large current to the traction machine 11 and the inverter 1513, and thus ensuring that both the traction machine 11 and the inverter 1513 have a longer service life.

[0121] Please refer to Figure 3-5 This application also provides a control method for elevator 1, applicable to elevator control circuit 15. The control method for elevator 1 includes:

[0122] Step S100: Control safety circuit module 153 to shut down, so that safety torque shutdown module 152 is shut down.

[0123] In this embodiment, the main controller 1532 controls the safety loop module 153 to shut down, thereby disconnecting the driver 1511 from the first bridge arm 1513A, further restricting the driver 1511 from sending drive signals to the first bridge arm 1513A, so as to ensure that the first bridge arm 1513A is in the off state.

[0124] Step S200: Based on the feedback signal that the safety torque shutdown module 152 is in the off state, the control driver 1511 sends a star-sealing signal to the star-sealing module 154 so that the star-sealing module 154 controls the second bridge arm 1513B of the inverter 1513 to star-seale.

[0125] In this embodiment, when the driver 1511 receives a feedback signal from the safety torque shutdown controller 1522 indicating that the switching circuit 1521 is in the off state, the driver 1511 will send a star-sealing signal to the star-sealing module 154, so that the star-sealing module 154 controls the second bridge arm 1513B of the inverter 1513 to be star-sealed. This prevents the star-sealing module 154 from star-sealing the second bridge arm 1513B when the first bridge arm 1513A is in the off state, thereby preventing the inverter 1513 from being short-circuited and burned out, and thus giving the inverter 1513 a longer service life.

[0126] Please refer to Figure 3 and Figure 6 In one specific embodiment, the safety loop module 153 includes a main controller 1532 and a first safety switch Q1, and step S100 includes:

[0127] Step S110: Send a first shutdown signal to the first safety switch Q1 through one of the main controller 1532 and the driver 1511 to control the first safety switch Q1 to shut down, so that the safety torque shutdown module 152 is shut down.

[0128] In this embodiment of the application, when at least one of the main controller 1532 and the driver 1511 sends a first shutdown signal to the first logic circuit L1, the first logic circuit L1 controls the first safety switch Q1 to shut down, thereby shutting down the safety circuit 1531 and thus shutting down the safety torque shutdown module 152.

[0129] Please refer to Figure 3 and Figure 7 In one specific embodiment, the process includes, simultaneously with or before performing step S200, the following:

[0130] Step S210: Send a second shutdown signal triggered by a star-blocking signal to the first safety switch Q1 via the driver 1511 so that the first safety switch Q1 remains off.

[0131] In this embodiment, when the driver 1511 sends a star-sealing signal to the star-sealing module 154 to control the second bridge arm 1513B of the inverter 1513 to star-seale, the first safety switch Q1 receives a second shutdown signal triggered by the star-sealing signal, keeping the first safety switch Q1 off. This allows the first safety switch Q1 to be controlled to shut off if the first shutdown signal or the first safety switch Q1 is abnormal, preventing it from shutting off. This provides double protection for the first safety switch Q1, ensuring the first bridge arm 1513A is shut off and preventing a short circuit in the inverter 1513. It is understood that the driver 1511 can also first send the second shutdown signal to the first safety switch Q1 and then send the star-sealing signal to the star-sealing module 154 to control the second bridge arm 1513B of the inverter 1513 to star-seale, also achieving double protection for the first safety switch Q1. This will not be elaborated further here.

[0132] Please refer to Figure 3 and Figure 8 In yet another specific embodiment, the frequency converter module 151 further includes a buffer 1512, and during or before performing step S200, it also includes:

[0133] Step S220: Control buffer 1512 restricts driver 1511 from sending drive signals to first bridge arm 1513A and second bridge arm 1513B.

[0134] In this embodiment of the application, when the driver 1511 sends a star-sealing signal to the star-sealing module 154, the buffer 1512 restricts the driver 1511 from sending drive signals to the first bridge arm 1513A and the second bridge arm 1513B according to the star-sealing signal. This prevents the first bridge arm 1513A from turning on when the second bridge arm 1513B is turned on by the star-sealing module 154, thereby preventing the inverter 1513 from short-circuiting.

[0135] Understandably, the driver 1511 can also first send a shutdown signal to the buffer 1512 to restrict the driver 1511 from sending drive signals to the first bridge arm 1513A and the second bridge arm 1513B through the buffer 1512. This can achieve double protection based on the first safety switch Q1 being open, thereby ensuring that the first bridge arm 1513A is turned off. Then, the driver 1511 sends a star-sealing signal to the star-sealing module 154. The star-sealing module 154 controls the second bridge arm 1513B to be star-sealed according to the star-sealing signal. Similarly, when the second bridge arm 1513B is star-sealed, the first bridge arm 1513A is prevented from being turned on, thereby preventing the inverter 1513 from being short-circuited.

[0136] Please refer to Figure 4 and Figure 9In one specific embodiment, the safety loop module 153 includes a main controller 1532, a first safety switch Q1, and a second safety switch Q2 connected in series with the first safety switch Q1;

[0137] Step S100 includes:

[0138] S120: A first shutdown signal is sent to the first safety switch Q1 through at least one of the main controller 1532 and the driver 1511 to control the first safety switch Q1 to shut down, so that the safety torque shutdown module 152 is shut down.

[0139] In this embodiment of the application, when at least one of the main controller 1532 and the driver 1511 sends a first shutdown signal to the first logic circuit L1, the first logic circuit L1 controls the first safety switch Q1 to shut down, thereby shutting down the safety circuit 1531 and thus shutting down the safety torque shutdown module 152.

[0140] At the same time as or before performing step S200, the following are also included:

[0141] S230, the second shutdown signal triggered by the star-blocking signal is sent to the second safety switch Q2 through the driver 1511, so that the second safety switch Q2 is turned off.

[0142] In this embodiment, when the driver 1511 sends a star-sealing signal to the star-sealing module 154, the star-sealing module 154 controls the second bridge arm 1513B to star-seale according to the star-sealing signal. At the same time, the second logic circuit L2 also controls the second safety switch Q2 to turn off according to the second shutdown signal triggered by the star-sealing signal. The second safety switch Q2 can be turned off on the basis of the first safety switch Q1 being open, so as to achieve double protection and ensure that the safety circuit 1531 is turned off, thereby ensuring that the first bridge arm 1513A is turned off. Thus, when the second bridge arm 1513B is star-sealed, the first bridge arm 1513A is prevented from conducting, thereby preventing the inverter 1513 from short-circuiting.

[0143] Understandably, the driver 1511 can also first send a second shutdown signal to the second logic circuit L2 to control the second safety switch Q2 to shut down. This allows the second safety switch Q2 to shut down on the basis of the first safety switch Q1 being open, thus achieving double protection and ensuring that the safety circuit 1531 is shut down, thereby ensuring that the first bridge arm 1513A is shut down. Then, the driver 1511 sends a star-sealing signal to the star-sealing module 154. The star-sealing module 154 controls the second bridge arm 1513B to be star-sealed according to the star-sealing signal. Similarly, when the second bridge arm 1513B is star-sealed, the first bridge arm 1513A is prevented from conducting, thereby preventing the inverter 1513 from short-circuiting.

[0144] Please refer to Figure 4 and Figure 10In one specific embodiment, the frequency converter module 151 further includes a buffer 1512, and during or before executing step S200, it also includes:

[0145] Step S240: Control buffer 1512 restricts driver 1511 from sending drive signals to first bridge arm 1513A and second bridge arm 1513B.

[0146] In this embodiment of the application, when the driver 1511 sends a star-sealing signal to the star-sealing module 154, the buffer 1512 restricts the driver 1511 from sending drive signals to the first bridge arm 1513A and the second bridge arm 1513B according to the star-sealing signal. This prevents the first bridge arm 1513A from turning on when the second bridge arm 1513B is turned on by the star-sealing module 154, thereby preventing the inverter 1513 from short-circuiting.

[0147] Understandably, the driver 1511 can also first send a shutdown signal to the buffer 1512 to restrict the driver 1511 from sending drive signals to the first bridge arm 1513A and the second bridge arm 1513B through the buffer 1512. This can achieve double protection based on the first safety switch Q1 being open, thereby ensuring that the first bridge arm 1513A is turned off. Then, the driver 1511 sends a star-sealing signal to the star-sealing module 154. The star-sealing module 154 controls the second bridge arm 1513B to be star-sealed according to the star-sealing signal. Similarly, when the second bridge arm 1513B is star-sealed, the first bridge arm 1513A is prevented from being turned on, thereby preventing the inverter 1513 from being short-circuited.

[0148] Please refer to Figure 3-4 and Figure 11 In one specific embodiment, the elevator control circuit 15 further includes an encoder 155, and step S200 includes:

[0149] Step S250: Obtain the encoder information output by encoder 155, and obtain the rotational speed of traction machine 11 of elevator 1 based on the encoder information.

[0150] In this embodiment of the application, when the elevator 1 is moving, the driver 1511 obtains the rotational speed of the traction machine 11 from the encoder 155.

[0151] Step S260: Based on the condition that the rotation speed is less than the preset rotation speed, control the driver 1511 to send a star-sealing signal to the star-sealing module 154.

[0152] In this embodiment, when the elevator 1 stops, the brake of the traction machine 11 is locked to decelerate the traction machine 11. When the speed of the traction machine 11 obtained by the driver 1511 is less than the preset speed, the driver 1511 sends a star-sealing signal to the star-sealing module 154 to prevent star-sealing during the high-speed rotation of the traction machine 11, thereby reducing the current generated during star-sealing, reducing the damage of the large current to the traction machine 11 and the inverter 1513, and thus ensuring that both the traction machine 11 and the inverter 1513 have a longer service life.

[0153] Please refer to Figure 3-4 and Figure 12 In one specific embodiment, before step S100, the control method for elevator 1 further includes:

[0154] In step S300, the control driver 1511 stops outputting drive signals to the first bridge arm 1513A and the second bridge arm 1513B of the inverter 1513.

[0155] In this embodiment, when the main controller 1532 receives a stop command or an abnormal stop, the control driver 1511 stops outputting drive signals to the first bridge arm 1513A and the second bridge arm 1513B, thereby turning off the first bridge arm 1513A and the second bridge arm 1513B, so as to de-energize the traction machine 11, thereby locking the brake of the traction machine 11, slowing down the traction machine 11, and thus slowing down the car 13.

[0156] Please refer to Figure 3-4 and Figure 13 This application also provides a control method for elevator 1, applicable to elevator control circuit 15. The control method for elevator 1 includes:

[0157] Step S400: The control driver 1511 sends a star-unblocking signal to the star-blocking module 154 so that the star-blocking module 154 releases the star-blocking state of the second bridge arm 1513B.

[0158] In this embodiment of the application, the start command includes an elevator up command and an elevator down command. When the main controller 1532 receives the start signal, the main controller 1532 controls the driver 1511 to send a release signal to the star-sealing module 154, so that the star-sealing module 154 controls the second bridge arm 1513B to release the star-sealing.

[0159] Step S500: Control safety circuit module 153 to turn on, so that safety torque shutdown module 152 turns on.

[0160] In this embodiment, when the driver 1511 detects that the second bridge arm 1513B is disconnected, and the main controller 1532 detects that the safety torque shutdown module 152, the safety circuit module 153, and the star-sealing module 154 are normal, both the main controller 1532 and the driver 1511 send a first conduction signal to the safety circuit 1531 to control the safety circuit 1531 to conduct, thereby controlling the safety torque shutdown module 152 to conduct.

[0161] Please refer to Figure 3 as well as Figure 14 In one specific embodiment, the safety loop module 153 includes a main controller 1532 and a first safety switch Q1, and step S500 includes:

[0162] In step S510, the driver 1511 and the main controller 1532 both send a first conduction signal to the first safety switch Q1 to control the first safety switch Q1 to conduct, so that the safety circuit module 153 conducts, and the safety torque shutdown module 152 conducts.

[0163] In this embodiment, when both the main controller 1532 and the driver 1511 send a first turn-on signal to the first logic circuit L1, the first logic circuit L1 controls the first safety switch Q1 to turn on, thereby turning on the safety circuit 1531, which in turn turns on the safety torque shutdown module 152, so that the driver 1511 can send drive signals to the first bridge arm 1513A and the second bridge arm 1513B of the inverter 1513, so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0164] Please refer to Figure 3 as well as Figure 15 In one specific embodiment, the process of performing step S400 may include, simultaneously with or after:

[0165] Step S410: Control buffer 1512 is released from restriction so that driver 1511 can send drive signals to first bridge arm 1513A and second bridge arm 1513B.

[0166] In this embodiment, when the driver 1511 sends a release signal to the star-sealing module 154, the buffer 1512 releases the restriction on the drive signal according to the release signal, so that the driver 1511 can send drive signals to the first bridge arm 1513A and the second bridge arm 1513B. This allows the driver 1511 to send drive signals to the first bridge arm 1513A and the second bridge arm 1513B when the safety torque shutdown module 152 is turned on, so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0167] Understandably, after the driver 1511 sends a release signal to the star-sealing module 154, causing the star-sealing module 154 to release the star-sealing of the second bridge arm 1513B, the driver 1511 sends a conduction signal to the buffer 1512 to control the buffer 1512 to release the restriction on the drive signal, so that the driver 1511 can send drive signals to the first bridge arm 1513A and the second bridge arm 1513B. Thus, when the safety torque shutdown module 152 is turned on, the driver 1511 can send drive signals to the first bridge arm 1513A and the second bridge arm 1513B, so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0168] Please refer to Figure 3 as well as Figure 16 In one specific embodiment, the safety loop module 153 includes a main controller 1532, a first safety switch Q1, and a second safety switch Q2 connected in series with the first safety switch Q1.

[0169] Step S500 includes:

[0170] In step S520, both the driver 1511 and the main controller 1532 send a first conduction signal to the first safety switch Q1 to control the first safety switch Q1 to conduct, thereby turning on the safety circuit module 153 and thus turning on the safety torque shut-off module 152.

[0171] In this embodiment, when both the main controller 1532 and the driver 1511 send a first turn-on signal to the first logic circuit L1, the first logic circuit L1 controls the first safety switch Q1 to turn on, thereby turning on the safety circuit 1531, which in turn turns on the safety torque shutdown module 152, so that the driver 1511 can send drive signals to the first bridge arm 1513A and the second bridge arm 1513B of the inverter 1513, so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0172] During or after performing step S400, the following may also be included:

[0173] Step S420: Send a second turn-on signal triggered by the release star signal to the second safety switch Q2 through the driver 1511 to control the second safety switch Q2 to turn on.

[0174] In this embodiment of the application, when the driver 1511 sends a star-unblocking signal to the star-unblocking module 154, the star-unblocking module 154 controls the second bridge arm 1513B to unblock the star according to the star-unblocking signal, so that the second bridge arm 1513B is turned off. At the same time, the second logic circuit L2 also controls the second safety switch Q2 to turn on according to the second conduction signal triggered by the star-unblocking signal.

[0175] Understandably, when the driver 1511 sends a star-unblocking signal to the star-blocking module 154, the star-blocking module 154 controls the second bridge arm 1513B to unblock the star according to the star-unblocking signal, so that the second bridge arm 1513B is turned off. Then, the driver 1511 sends a second turn-on signal to the second logic circuit L2, and the second logic circuit L2 controls the second safety switch Q2 to turn on.

[0176] Please refer to Figure 4 and Figure 17 In one specific embodiment, the frequency converter module 151 further includes a buffer 1512, and during or after executing step S400, it further includes:

[0177] Step S430: Control buffer 1512 is released from restriction so that driver 1511 can send drive signals to first bridge arm 1513A and second bridge arm 1513B.

[0178] In this embodiment, when the driver 1511 sends a release signal to the star-sealing module 154, the buffer 1512 releases the restriction on the drive signal according to the release signal, so that the driver 1511 can send drive signals to the first bridge arm 1513A and the second bridge arm 1513B. This allows the driver 1511 to send drive signals to the first bridge arm 1513A and the second bridge arm 1513B when the safety torque shutdown module 152 is turned on, so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0179] Understandably, after the driver 1511 sends a release signal to the star-sealing module 154, causing the star-sealing module 154 to release the star-sealing of the second bridge arm 1513B, the driver 1511 sends a conduction signal to the buffer 1512 to control the buffer 1512 to release the restriction on the drive signal, so that the driver 1511 can send drive signals to the first bridge arm 1513A and the second bridge arm 1513B. Thus, when the safety torque shutdown module 152 is turned on, the driver 1511 can send drive signals to the first bridge arm 1513A and the second bridge arm 1513B, so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0180] Please refer to Figure 3 and Figure 18 In one specific embodiment, after step S500, the method further includes:

[0181] In step S600, based on the feedback signal that the safety torque shutdown module 152 is in the on state, the control driver 1511 sends a drive signal to the first bridge arm 1513A and the second bridge arm 1513B of the inverter 1513 so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0182] In this embodiment of the application, when the driver 1511 receives a feedback signal from the safety torque shutdown controller 1522 indicating that the switching circuit 1521 is in the on state, the driver 1511 sends a drive signal to the first bridge arm 1513A and the second bridge arm 1513B of the inverter 1513 so that the inverter 1513 drives the traction machine 11 of the elevator 1 to work.

[0183] This application also provides a computer storage medium that stores multiple instructions. The instructions are adapted to be loaded by a processor and executed as steps of a control method. For details of the execution process, please refer to the specific description of the above embodiments, which will not be repeated here.

[0184] Specifically, the steps of the above method can be integrated into one processing unit, or integrated into multiple processing units, with each processing unit existing independently, or two or more processing units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0185] The integrated unit is implemented as a software functional unit and, when sold or used as an independent product, can be stored in a computer-readable storage medium. Understandably, the storage medium stores multiple program instructions suitable for loading by a processor and executing the steps of the aforementioned method.

[0186] Multiple program instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute the steps of the above method. The aforementioned storage device may include: USB flash drive, portable hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, server, and other media capable of storing program code.

[0187] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0188] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An elevator control circuit, characterized in that, include: The frequency conversion module includes a driver and an inverter, wherein the inverter includes a first bridge arm and a second bridge arm, both of which are connected to the driver; A safe torque shutdown module includes a switching circuit and a safe torque shutdown controller. The switching circuit is connected in series between the driver and the first bridge arm. The safe torque shutdown controller is used to monitor the on / off state of the switching circuit and is connected to the driver. A safety circuit module, connected to the switching circuit, is used to control the on / off state of the switching circuit; when the safety circuit module is turned off, the switching circuit is turned off. The sealing module is connected to the driver and also to the second bridge arm; When the elevator stops, the safety circuit module controls the switch circuit to turn off, thereby limiting the driver from sending drive signals to the first bridge arm. When the driver receives a feedback signal from the safety torque shutdown controller indicating that the switch circuit is in the off state, the driver sends a star-sealing signal to the star-sealing module, so that the star-sealing module controls the second bridge arm to star-seale.

2. The elevator control circuit as described in claim 1, characterized in that, The safety loop module includes: A safety circuit is connected to the safety torque shutdown module and the driver. The main controller is connected to the driver and the safety circuit, and is used to control the on / off state of the safety circuit and to monitor the on / off state of the safety circuit. When at least one of the main controller and the driver sends a shutdown signal to the safety circuit, the safety circuit shuts down, thereby shutting down the safety torque shutdown module.

3. The elevator control circuit as described in claim 2, characterized in that, The safety circuit includes: The first safety switch is connected to the safety torque shutdown module; A first logic circuit, connected to the first safety switch, and connected to the main controller and the driver, is used to control the first safety switch to turn off according to a first shutdown signal, so as to shut down the safety circuit.

4. The elevator control circuit as described in claim 3, characterized in that, The safety circuit also includes: The second safety switch is connected in series with the first safety switch and connected to the safety torque shutdown module; A second logic circuit, connected to the second safety switch and the driver, is used to control the second safety switch to turn off according to a second shutdown signal triggered by the star-sealing signal.

5. The elevator control circuit as described in claim 3, characterized in that, The driver includes a drive signal output terminal and a star-sealing signal output terminal, and the frequency converter module further includes: The buffer is connected to both the drive signal output and the star-blocking signal output, and is also connected to the safety torque shutdown module. It is used to restrict the driver from sending the drive signal to the first bridge arm and the second bridge arm according to the star-blocking signal sent by the driver.

6. The elevator control circuit as described in claim 1, characterized in that, The switching circuit includes a first switching element and a second switching element. The first switching element and the second switching element are connected in series between the driver and the first bridge arm. Both the first switching element and the second switching element are connected to the safety loop module. When the safety loop module is turned off, both the first switching element and the second switching element are turned off.

7. The elevator control circuit as described in any one of claims 1-6, characterized in that, Also includes: An encoder, connected to the driver, is used to connect to the traction machine to monitor the rotational speed of the traction machine and feed it back to the driver.

8. A method for controlling an elevator, characterized in that, The elevator control method, applicable to any one of claims 1-7, comprises: The safety circuit module is shut down to cause the safety torque shutdown module to shut down. Based on the feedback signal that the safety torque shutdown module is in the off state, the driver is controlled to send a star-sealing signal to the star-sealing module, so that the star-sealing module controls the second bridge arm of the inverter to star-seale.

9. The elevator control method as described in claim 8, characterized in that, The safety circuit module includes a main controller and a first safety switch. The step of controlling the safety circuit module to shut down, thereby shutting down the safety torque shutdown module, includes: At least one of the main controller and the driver sends a first shutdown signal to the first safety switch to control the first safety switch to shut down, thereby shutting down the safety torque shutdown module.

10. The elevator control method as described in claim 9, characterized in that, The step of controlling the driver to send a star-sealing signal to the star-sealing module based on the feedback signal that the safety torque shutdown module is in the off state, or before it, further includes: The driver sends a second shutdown signal triggered by the star-sealing signal to the first safety switch, so that the first safety switch remains off; and / or, The frequency conversion module further includes a buffer, and during or before the step of controlling the driver to send a star-sealing signal to the star-sealing module based on the feedback signal that the safe torque shutdown module is in the off state, it also includes: The buffer is controlled to restrict the driver from sending the drive signal to the first bridge arm and the second bridge arm.

11. The elevator control method as described in claim 8, characterized in that, The safety circuit module includes a main controller, a first safety switch, and a second safety switch connected in series with the first safety switch; The step of controlling the safety circuit module to shut down, thereby shutting down the safety torque shutdown module, includes: At least one of the main controller and the driver sends a first shutdown signal to the first safety switch to control the first safety switch to shut down, thereby shutting down the safety torque shutdown module. The step of controlling the driver to send a star-sealing signal to the star-sealing module based on the feedback signal that the safety torque shutdown module is in the off state, or before it, also includes: The driver sends a second shutdown signal triggered by the star-sealing signal to the second safety switch, causing the second safety switch to turn off; and / or, The frequency conversion module further includes a buffer, and during or before the step of controlling the driver to send a star-sealing signal to the star-sealing module based on the feedback signal that the safety torque shutdown module is in the off state, it also includes: The control buffer restricts the driver from sending the drive signal to the first bridge arm and the second bridge arm.

12. The elevator control method as described in claim 8, characterized in that, The elevator control circuit also includes an encoder, and the step of controlling the driver to send a star-sealing signal to the star-sealing module includes: Obtain the encoder information output by the encoder, and obtain the rotational speed of the elevator traction machine based on the encoder information; Based on the condition that the rotation speed is less than the preset rotation speed, the driver is controlled to send the star-sealing signal to the star-sealing module.

13. The elevator control method as described in claim 8, characterized in that, Prior to the step of shutting off the safety circuit module to turn off the safety torque shutdown module, the elevator control method further includes: The driver is controlled to stop outputting drive signals to the first and second arms of the inverter.

14. A method for controlling an elevator, characterized in that, The elevator control method, applicable to any one of claims 1-7, comprises: The driver is controlled to send a release signal to the star-sealing module, so that the star-sealing module releases the star-sealing state of the second bridge arm; The safety circuit module is turned on to enable the safety torque shutdown module.

15. The elevator control method as described in claim 14, characterized in that, The safety circuit module includes a main controller and a first safety switch. The step of controlling the safety circuit module to turn on, so as to turn on the safety torque shutdown module, includes: Both the driver and the main controller send a first conduction signal to the first safety switch to control the first safety switch to conduct, thereby enabling the safety circuit module to conduct, and thus enabling the safety torque shutdown module to conduct.

16. The elevator control method as described in claim 15, characterized in that, Simultaneously or after the step of controlling the driver to send an unblocking signal to the blocking module, the method further includes: Control the buffer contact limit so that the driver can send the drive signal to the first bridge arm and the second bridge arm.

17. The elevator control method as described in claim 14, characterized in that, The safety circuit module includes a main controller, a first safety switch, and a second safety switch connected in series with the first safety switch; The step of controlling the safety circuit module to turn on, so as to turn on the safety torque shutdown module, includes: Both the driver and the main controller send a first conduction signal to the first safety switch to control the first safety switch to conduct, thereby turning on the safety circuit module and thus turning on the safety torque shutdown module. Simultaneously or subsequently, the process of executing the control to send a de-seal signal to the de-seal module, so that the de-seal module releases the de-seal status of the second bridge arm, also includes: The driver sends a second turn-on signal triggered by the unsealing signal to the second safety switch to control the second safety switch to turn on; and / or, The frequency converter module further includes a buffer, and simultaneously or subsequently, when executing the control to send a de-star signal to the star-sealing module so that the star-sealing module releases the star-sealing state of the second bridge arm, it also includes: The buffer is controlled to release the restriction so that the driver can send the drive signal to the first bridge arm and the second bridge arm.

18. The elevator control method as described in claim 14, characterized in that, After the step of controlling the safety circuit module to turn on, so as to turn on the safety torque shutdown module, the method further includes: Based on the feedback signal that the safety torque shutdown module is in the on state, the driver is controlled to send drive signals to the first bridge arm and the second bridge arm of the inverter, so that the inverter drives the elevator traction machine to work.

19. An elevator, characterized in that, Includes the elevator control circuit as described in any one of claims 1-8, or performs the steps of the method as described in any one of claims 8-18.

20. A computer storage medium storing a plurality of instructions adapted for loading by a processor and performing the steps of the method as claimed in any one of claims 8-18.

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