Elevator control system and control method

Abstract

The application discloses an elevator control system and a control method, wherein the circuit comprises a hall door lock module, a car door lock module, a door lock safety relay module, a voltage conversion module, a brake control module, an elevator main control module and a frequency converter module. The application can set the door lock safety relay module between the hall door lock module, the car door lock module and the voltage conversion module to replace the existing contactor, meanwhile, the elevator main control module can control the star seal of the elevator through the signal output of the elevator main control module and the signal output by the voltage conversion module, so that the use of the contactor is reduced, meanwhile, the brake control module can control the brake power to be the first preset voltage through the third driving signal, the third driving voltage and the brake control signal, so that the brake module stops working, the application can change the structure and the control logic of the circuit, reduce the use of the contactor in the system, improve the stability and reduce the cost of the control system. The application can be widely applied to the elevator control technical field.

Description

Technical Field

[0001] This application relates to the field of elevator control technology, and in particular to an elevator control system and control method. Background Technology

[0002] In related technologies, to achieve motor star-locking and brake control in elevators, traditional elevator control systems typically employ several contactors between the main control module and the hall door lock and car door lock modules, a brake contactor between the brake power supply and the brake, and a star-locking contactor between the inverter and the motor. The system can use the opening and closing of the main contactors to provide feedback on the normal operation of the hall door lock and car door lock modules. If these modules are functioning correctly, they output a fixed voltage signal to the main control module. The main control module then determines whether star-locking is required based on these voltage signals. When star-locking is in operation, the main control module can short-circuit the three-phase coils of the motor via the star-locking contactor to brake the motor. Furthermore, the main control module can use the output voltage signal to control whether the brake power supply stops supplying power to the brake via the brake contactor.

[0003] However, traditional elevator control systems suffer from low integration and difficulty in miniaturization due to their multiple contactor design. Furthermore, a large number of contactors in the control system can generate significant noise, reducing the system's anti-interference capability and consequently decreasing elevator stability. Therefore, there are still technical problems that need to be solved in this field. Summary of the Invention

[0004] The purpose of this application is to at least partially solve one of the technical problems existing in the prior art.

[0005] Therefore, one objective of this application is to provide an elevator control system and control method that can improve the integration and stability of the elevator control system.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted in the embodiments of this application includes: 1. An elevator control system, characterized in that it includes: Hall door lock module, car door lock module, door lock safety relay module, voltage conversion module, brake control module, elevator main control module, and frequency converter module; The elevator main control module is used to output a first drive signal, a second drive signal, a third drive signal, a star control signal, and a brake control signal; The door lock safety relay module is used to output the first driving voltage of the brake control module according to the first switching state of the hall door lock module, the second switching state of the car door lock module and the first driving signal; The voltage conversion module is used to output a second driving voltage and a third driving voltage according to the first driving voltage and the second driving signal; The brake control module is used to control the brake power supply to output a first preset voltage according to the third drive signal, the third drive voltage and the brake control signal, so as to stop the brake module from working. The elevator main control module is also used to output a fourth drive signal according to the second drive voltage; The inverter module is used to control whether to stop supplying power to the drive host according to the fourth drive signal, and to seal the elevator motor according to the sealing control signal.

[0007] In addition, the elevator control system according to the above embodiments of the present invention may also have the following additional technical features: Furthermore, in this embodiment of the application, the door lock safety relay module includes a first voltage conversion unit and a first relay; The first voltage conversion unit is used to control the first relay to close according to the first switch state of the hall door lock module and the first drive signal; When the first relay is closed, the door lock safety relay module outputs the driving voltage of the brake control module according to the second switch state.

[0008] Furthermore, in this embodiment, the voltage conversion module includes a second voltage conversion unit and a third voltage conversion unit; The second voltage conversion unit is used to convert the first driving voltage into a second driving voltage according to the second driving signal; The third voltage conversion unit is used to convert the first driving voltage into a third driving voltage according to the second driving signal.

[0009] Furthermore, in this embodiment of the application, the brake control module includes a brake power supply and a first control unit: The first control unit is configured to output a first control signal based on the third driving signal and the third driving voltage; The brake power supply is used to output a first preset voltage according to the first control signal.

[0010] Furthermore, in this embodiment of the application, the inverter module includes: an STO functional unit and an inverter drive unit; The inverter drive unit is used to drive the motor or stop power supply to the host and shut down the satellite according to the signal from the STO function unit. The STO function unit is used to control whether the frequency converter drive unit stops supplying power to the drive host according to the fourth drive signal, and at the same time generate a feedback signal to the elevator main control module.

[0011] Furthermore, in this embodiment, the car door lock module includes a safety circuit switch, a car door lock switch, a car door bypass switch, and an elevator car accidental movement protection system switch; the second switch state includes the safety circuit switch, the car door lock switch, and the car door bypass switch all being in a closed state, or the safety circuit switch being in a closed state and the elevator car accidental movement protection system switch being in a closed state.

[0012] Furthermore, in this embodiment of the application, the first driving voltage is 110V, the second driving voltage is 24V, and the third driving voltage is 5V; Furthermore, in this embodiment of the application, the hall door lock module includes a hall door bypass switch and a hall door switch, and the first switch state includes both the hall door bypass switch and the hall door switch being in a closed state.

[0013] On the other hand, embodiments of this application also provide an elevator control method, implemented through any of the elevator control systems described in the preceding claims, the method comprising: The elevator main control module outputs a first drive signal, a second drive signal, a third drive signal, a star control signal, and a brake control signal; The door lock safety relay module outputs the first drive voltage of the brake control module based on the first switch state of the hall door lock module, the second switch state of the car door lock module, and the first drive signal. The voltage conversion module outputs a second driving voltage and a third driving voltage based on the first driving voltage and the second driving signal; The brake control module controls the brake power supply to output a first preset voltage according to the third drive signal, the third drive voltage and the brake control signal, so as to stop the brake module from working; The elevator main control module outputs a fourth drive signal based on the third drive voltage; The inverter module controls whether to stop supplying power to the drive host according to the fourth drive signal, and seals the elevator motor according to the sealing control signal.

[0014] Further, in this embodiment, the car door lock module includes a safety circuit switch, a car door lock switch, a car door bypass switch, and an elevator car accidental movement protection system switch; the hall door lock module includes a hall door bypass switch and a hall door switch, the first switch state including both the hall door bypass switch and the hall door switch being in a closed state; the door lock safety relay module outputs a first driving voltage of the brake control module according to the first switch state of the hall door lock module, the second switch state of the car door lock module, and the first driving signal, including: When the safety circuit switch, the car door lock switch, and the car door bypass switch are all closed, and the hall door bypass switch and the hall door switch are all closed, the door lock safety relay module outputs the first drive voltage of the brake control module based on the first drive signal; Alternatively, when the safety circuit switch is closed, the elevator car accidental movement protection system switch is closed, and both the hall door bypass switch and the hall door switch are closed, the door lock safety relay module outputs the first driving voltage of the brake control module based on the first driving signal.

[0015] The advantages and beneficial effects of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application: This application can include a hall door lock module, a car door lock module, a door lock safety relay module, a voltage conversion module, a brake control module, an elevator main control module, and a frequency converter module. The elevator main control module can output a first drive signal, a second drive signal, a third drive signal, a star control signal, and a brake control signal; the door lock safety relay module can output a first drive voltage for the brake control module based on the first switching state of the hall door lock module, the second switching state of the car door lock module, and the first drive signal; the voltage conversion module can output a second drive voltage and a third drive voltage based on the first drive voltage and the second drive signal; the brake control module can control the brake power supply to output a first preset voltage based on the third drive signal, the third drive voltage, and the brake control signal, so as to stop the brake module from working; the elevator main control module is also used to output a fourth drive signal based on the second drive voltage; the frequency converter module can control the brake power supply to output a first preset voltage based on the fourth drive signal. This application controls whether to stop power supply to the drive unit and, based on the sealing control signal, seals the elevator motor. It can replace existing contactors by setting a door lock safety relay module between the hall door lock module, car door lock module, and voltage conversion module. Simultaneously, the elevator main control module can control the elevator's sealing via its own signal output and the signal output from the voltage conversion module, further reducing the use of contactors. Furthermore, the brake control module can control the brake power supply to a first preset voltage via a third drive signal, the third drive voltage, and the brake control signal, thereby stopping the brake module from working. This application can change the circuit structure and control logic, reducing the use of contactors in the control system, improving the stability of the control system, and reducing the cost of the control system. Attached Figure Description

[0016] Figure 1 This is a circuit diagram of an existing elevator control system. Figure 2 This is a circuit diagram showing the connection between the hall door lock module and the car door lock module of an existing elevator control system and the elevator main control module via contactors. Figure 3 This is a circuit diagram of an elevator control system in a specific embodiment of the present invention; Figure 4 This is a circuit diagram illustrating the connection between the hall door lock module and the car door lock module and the elevator main control module via the door lock safety relay module in a specific embodiment of the present invention. Figure 5 This is a circuit diagram of the elevator main control module in a specific embodiment of the present invention. Detailed Implementation

[0017] The following detailed description, in conjunction with the accompanying drawings, illustrates the principles and processes of the elevator control system and control method in the embodiments of the present invention.

[0018] First, let me explain the terms that appear in this application: UCMP: Unintended car movement protection system; STO: Safety Torque Off, is a safety device that disconnects the power supply to a motor. The definition of a safety device that disconnects the power supply to a motor is based on the requirements of standard GB / T 7588.1-2020, namely, AC or DC motors powered and controlled by static components, through a circuit conforming to the requirements of 5.11.2.3, the device is a safety component and should be verified according to the requirements of 5.6 in GB / T 7588.2-2020. According to GB / T 7588.1-2020 (or EN81-20:2014), the highest required SIL level for electrical safety devices is SIL3 with HFT ≥ 1.

[0019] SBC: Safety device for cutting off brake current. The definition of a safety device for cutting off brake current is based on the requirements of 5.9.2.2.2.3.a).2) in standard GB / T 7588.1-2020 (or EN81-20:2014), that is, when the safety device cuts off the brake current according to 5.11.2.4, it is done by ensuring that "the circuit meets the requirements of 5.11.2.3, this device is a safety component, and it should be verified according to the requirements of 5.6 in GB / T 7588.2-2020".

[0020] Secondly, based on Figure 1 as well as Figure 2 Explain the technical problems existing in the relevant technologies. Figure 1 The elevator system may include a hall door lock module, a car door lock module, a brake power supply, an elevator main control board (elevator main control module), a brake, a frequency converter (frequency converter module), and a motor. The number of brakes can be one or more. The hall door lock module may include a hall door lock switch and a hall door lock bypass switch. The car door lock module may include a safety circuit switch, a car door lock switch, a car door lock bypass switch, and a UCMP switch; four contactors, KM1, KM2, KM3, and KM4, may be installed between the hall door lock module, the car door lock module, and the elevator main control board. (See reference...) Figure 2 KM1, KM3, and KM4 can control the voltage and current transmission between the brake power supply and the brake; KM2 can control the inverter to achieve star-on control of the motor. The control process of a traditional elevator control system includes: (1) When the safety circuit switch is disconnected, the coil of the main unit running contactor KM1 is de-energized, and the normally open contact of KM1 is in the open state. At this time, the motor is not powered, thus achieving the safety torque cut-off.

[0021] (2) When the safety circuit switch is disconnected, the coil of the brake contactor KM3 is de-energized, and the normally open contact of KM3 is in the open state. At this time, the brake is not powered, thus cutting off the brake current.

[0022] (3) The motor is braked by short-circuiting the three-phase coils of the motor through the sealing contactor KM2.

[0023] It should be noted that hall door locks are usually connected in series with other safety devices to form a safety circuit. However, due to the large number of elevator floors, which often results in an excessively long hall door lock circuit, a separate circuit for the hall door lock is sometimes used, indirectly connected in series with other safety devices to form a safety circuit. Figure 1 The door lock contactor KM4 is used for bridging.

[0024] However, traditional elevator control systems suffer from low integration and difficulty in miniaturization due to their multiple contactor design. Furthermore, the large number of contactors reduces the system's anti-interference capability, leading to decreased elevator stability. Therefore, there are still technical problems that need to be solved in this field.

[0025] To address the aforementioned technical problems, this application provides a novel elevator control system. (Refer to...) Figure 3 The elevator control system of this application may include a hall door lock module, a car door lock module, a door lock safety relay module, a voltage conversion module, a brake control module, an elevator main control module, and a frequency converter module. The hall door lock module and car door lock module are externally connected to a 110V AC voltage and can be connected to the door lock safety relay module. The door lock safety relay module and the brake control module can be connected to the voltage conversion module. The frequency converter module, door lock safety relay module, brake control module, and voltage conversion module can be connected to the elevator main control module. The brake control module can be connected to an external power supply. The frequency converter module can be connected to the motor.

[0026] Reference Figure 3 and Figure 4The elevator main control module can output the first drive signal Y8, the second drive signal Y6, the third drive signal Y13, the star control signal FX, and the brake control signal Y5. The external voltage for the hall door lock module and the car door lock module can be 110V. The door lock safety relay module can output the first drive voltage of the brake control module based on the first switch state of the hall door lock module, the second switch state of the car door lock module, and the first drive signal Y8. It can be understood that Y8 allows the 110V voltage to flow through the transformer T2 of the door lock safety relay board, providing the 110V voltage to the door lock safety relay board for normal operation. The first switch state can be that both the hall door bypass switch and the hall door switch are closed; the second switch state can be that the safety circuit switch, the car door lock switch, and the car door bypass switch are all closed, or the safety circuit switch is closed and the elevator car accidental movement protection system switch is closed. The voltage conversion module can output the second drive voltage 24V and the third drive voltage 5V through the transformer T1 based on the first drive voltage 110V and the second drive signal Y13. Understandably, Y13 allows the first driving voltage of 110V to flow through the main winding of transformer T1, providing voltage to transformer T1. The brake control module can control the brake power supply to output a first preset voltage based on the third driving signal Y13, the third driving voltage of 5V, and the brake control signal Y5, so as to stop the brake module from working. The first preset voltage is 0V. The elevator main control module can also output a fourth driving signal STO+ and STO- based on the second driving voltage of 24V. The frequency converter module controls whether to stop supplying power to the drive unit based on the fourth driving signal, and performs a star-lock control on the elevator motor based on the star-lock control signal.

[0027] Furthermore, referring to Figure 3 The door lock safety relay module may include a first voltage conversion unit and a first relay. The first voltage conversion unit is connected to the first relay. When the hall door bypass switch is closed, the hall door lock switch is closed, and the Y8 signal causes a circuit to be formed between 110V and transformer T2, the first relay closes. When the first relay is closed, the door lock safety relay module can establish an electrical connection with the car door lock module.

[0028] Furthermore, referring to Figure 3 The voltage conversion module may include a second voltage conversion unit and a third voltage conversion unit; the voltage conversion module may include a transformer T1, which, under the action of the Y6 signal, can convert the first driving voltage 110V input to the door lock safety relay module into a second driving voltage 24V and a second driving voltage 5V.

[0029] Furthermore, the brake control module may include a brake power supply and a first control unit. The first control unit is used to output a first control signal based on the third drive signal Y13, the third drive voltage 5V, and the brake control signal Y5. The first control signal can control the brake power supply to output a preset voltage of 0V, that is, the first control signal can disconnect the power transmission between the brake power supply and the brake.

[0030] Furthermore, referring to Figure 3 The frequency converter module may include an STO function unit and a frequency converter drive unit. The frequency converter module is used to control whether to stop supplying power to the drive unit according to the fourth drive signal, and to seal the elevator motor according to the sealing control signal. The STO function unit is used to control whether the frequency converter drive unit stops supplying power to the drive unit according to the fourth drive signals STO+ and STO-, and simultaneously generate a feedback signal FB to the elevator main control module. The structure of the elevator main control module can be referred to... Figure 5 Since this application does not improve the hardware of the elevator main control module, its specific structure will not be described in detail here.

[0031] Furthermore, the car door lock module may include a safety circuit switch, a car door lock switch, a car door bypass switch, and an elevator car accidental movement protection system switch; the second switch state may include the safety circuit switch, the car door lock switch, and the car door bypass switch all being in the closed state, or the safety circuit switch being in the closed state and the elevator car accidental movement protection system switch being in the closed state.

[0032] Furthermore, the hall door lock module may include a hall door bypass switch and a hall door switch, and the first switch state may include both the hall door bypass switch and the hall door switch being in the closed state.

[0033] Furthermore, the first driving voltage is 110V, the second driving voltage is 24V, and the third driving voltage is 5V.

[0034] The specific calculation principle of this application is explained below with reference to the accompanying drawings: The structural diagram of this application is as follows: Figure 3 , Figure 4 as well as Figure 5 As shown, its implementation principle may include steps (11) to (15).

[0035] (11) The safety circuit enters the SBC power supply, and after voltage transformation, it generates an STO signal to the main control board, and generates an SBC signal (the circuit inserted by Y13) to the brake power supply circuit on the SBC power supply board.

[0036] (12) The main control board is based on STO+ and STO-, and divides the STO signal into two paths (STO1 and STO2) to enter the inverter module, and controls whether to stop the power supply to the drive host, thereby achieving the safe torque cut-off function without using the running contactor.

[0037] (13) The generated SBC signal can control whether the brake power supply stops supplying power to the brake, thereby realizing the function of stopping the supply of power to the brake without using the brake contactor.

[0038] (14) The main control board controls the IGBT lower tube of the frequency converter to form an electronic star seal, thereby realizing the function of motor star seal without using the star seal contactor.

[0039] (15) The safety relay board of this application replaces the door lock contactor. The door lock safety relay board consists of a power frequency transformer, a step-down circuit, and a safety relay. If the hall door lock circuit is closed, the 110VAC input board is converted to 24VDC to power the safety relay coil, and the normally open contact of the safety relay is energized and the normally closed contact is opened.

[0040] In some alternative embodiments, the functions / operations mentioned in the block diagrams may not occur in the order shown in the operation diagrams. For example, depending on the functions / operations involved, two consecutively shown blocks may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order. Furthermore, the embodiments presented and described in the flowcharts of this application are provided by way of example to provide a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and sub-operations described as part of a larger operation are executed independently.

[0041] Furthermore, although this application is described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the functions and / or features may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding this application. Rather, given the properties, functions, and internal relationships of the various functional modules in the apparatus disclosed herein, the actual implementation of the module will be understood within the scope of conventional technology for an engineer. Therefore, those skilled in the art can implement the application set forth in the claims using ordinary techniques without excessive experimentation. It is also understood that the specific concepts disclosed are merely illustrative and not intended to limit the scope of this application, which is determined by the full scope of the appended claims and their equivalents.

[0042] In the foregoing description of this specification, the references to terms such as "one embodiment," "another embodiment," or "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0044] The above is a detailed description of the preferred embodiments of this application, but this application is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An elevator control system, characterized in that, include: Hall door lock module, car door lock module, door lock safety relay module, voltage conversion module, brake control module, elevator main control module, and frequency converter module; The elevator main control module is used to output a first drive signal, a second drive signal, a third drive signal, a star control signal, and a brake control signal; The door lock safety relay module is used to output a first driving voltage of the brake control module based on the first switching state of the hall door lock module, the second switching state of the car door lock module, and the first driving signal; wherein, the hall door lock module includes a hall door bypass switch and a hall door switch, and the first switching state includes both the hall door bypass switch and the hall door switch being in a closed state; the car door lock module includes a safety circuit switch, a car door lock switch, a car door bypass switch, and an elevator car accidental movement protection system switch, and the second switching state includes the safety circuit switch, the car door lock switch, and the car door bypass switch all being in a closed state, or the safety circuit switch being in a closed state and the elevator car accidental movement protection system switch being in a closed state; The voltage conversion module is used to output a second driving voltage and a third driving voltage according to the first driving voltage and the second driving signal; The brake control module is used to control the brake power supply to output a first preset voltage according to the third drive signal, the third drive voltage and the brake control signal, so as to stop the brake module from working. The elevator main control module is also used to output a fourth drive signal according to the second drive voltage; The inverter module is used to control whether to stop supplying power to the drive host according to the fourth drive signal, and to seal the elevator motor according to the sealing control signal.

2. The elevator control system according to claim 1, characterized in that, The door lock safety relay module includes a first voltage conversion unit and a first relay; The first voltage conversion unit is used to control the first relay to close according to the first switch state of the hall door lock module and the first drive signal; When the first relay is closed, the door lock safety relay module outputs the driving voltage of the brake control module according to the second switch state.

3. The elevator control system according to claim 1, characterized in that, The voltage conversion module includes a second voltage conversion unit and a third voltage conversion unit; The second voltage conversion unit is used to convert the first driving voltage into a second driving voltage according to the second driving signal; The third voltage conversion unit is used to convert the first driving voltage into a third driving voltage according to the second driving signal.

4. The elevator control system according to claim 1, characterized in that, The brake control module includes a brake power supply and a first control unit: The first control unit is configured to output a first control signal based on the third driving signal and the third driving voltage; The brake power supply is used to output a first preset voltage according to the first control signal.

5. The elevator control system according to claim 1, characterized in that, The inverter module includes: an STO functional unit and an inverter drive unit; The inverter drive unit is used to drive the motor or stop power supply to the host and shut down the satellite according to the signal from the STO function unit. The STO function unit is used to control whether the frequency converter drive unit stops supplying power to the drive host according to the fourth drive signal, and at the same time generate a feedback signal to the elevator main control module.

6. The elevator control system according to claim 1, characterized in that, The first driving voltage is 110V, the second driving voltage is 24V, and the third driving voltage is 5V.

7. An elevator control method, characterized in that, The elevator control system described in any one of claims 1-6 is used, and the method includes: The elevator main control module outputs a first drive signal, a second drive signal, a third drive signal, a star control signal, and a brake control signal; The door lock safety relay module outputs the first drive voltage of the brake control module based on the first switch state of the hall door lock module, the second switch state of the car door lock module, and the first drive signal. The voltage conversion module outputs a second driving voltage and a third driving voltage based on the first driving voltage and the second driving signal; The brake control module controls the brake power supply to output a first preset voltage according to the third drive signal, the third drive voltage and the brake control signal, so as to stop the brake module from working; The elevator main control module outputs a fourth drive signal based on the third drive voltage; The inverter module controls whether to stop supplying power to the drive host according to the fourth drive signal, and seals the elevator motor according to the sealing control signal.

8. The elevator control method according to claim 7, characterized in that, The door lock safety relay module outputs the first drive voltage of the brake control module based on the first switch state of the hall door lock module, the second switch state of the car door lock module, and the first drive signal, including: When the safety circuit switch, the car door lock switch, and the car door bypass switch are all closed, and the hall door bypass switch and the hall door switch are all closed, the door lock safety relay module outputs the first drive voltage of the brake control module based on the first drive signal; Alternatively, when the safety circuit switch is closed, the elevator car accidental movement protection system switch is closed, and both the hall door bypass switch and the hall door switch are closed, the door lock safety relay module outputs the first driving voltage of the brake control module based on the first driving signal.

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