WO2023174078A1 - Dispositif de commande d'alimentation électrique d'ascenseur et système d'ascenseur - Google Patents

Dispositif de commande d'alimentation électrique d'ascenseur et système d'ascenseur Download PDF

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Publication number
WO2023174078A1
WO2023174078A1 PCT/CN2023/079669 CN2023079669W WO2023174078A1 WO 2023174078 A1 WO2023174078 A1 WO 2023174078A1 CN 2023079669 W CN2023079669 W CN 2023079669W WO 2023174078 A1 WO2023174078 A1 WO 2023174078A1
Authority
WO
WIPO (PCT)
Prior art keywords
safety detection
control device
elevator
power supply
circuit
Prior art date
Application number
PCT/CN2023/079669
Other languages
English (en)
Chinese (zh)
Inventor
潘敏杰
Original Assignee
菱王电梯有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 菱王电梯有限公司 filed Critical 菱王电梯有限公司
Priority to AU2023236513A priority Critical patent/AU2023236513A1/en
Publication of WO2023174078A1 publication Critical patent/WO2023174078A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/02—Control systems without regulation, i.e. without retroactive action
    • B66B1/06—Control systems without regulation, i.e. without retroactive action electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
    • B66B13/22—Operation of door or gate contacts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators

Definitions

  • the present disclosure relates to the technical field of elevators, and specifically to an elevator power control device and an elevator system.
  • Elevator electrical safety devices are placed in the machine room, hoistway, landing door, car roof, and pit. Elevator control uses the electrical safety devices at these different locations to control the operation and stop of the elevator. Therefore, the series connection of the entire elevator's electrical safety devices All of the above, this makes for very long electrical safety loop lines. Therefore, the circuit resistance of the electrical safety device is too large and there is a voltage drop. If the elevator is used for a long time, the operation of the elevator will be unstable and there will be safety risks.
  • the main purpose of the present disclosure is to provide an elevator power control device and an elevator system, aiming to solve the technical problem of unstable operation of the elevator.
  • an elevator power control device including:
  • the safety detection component includes a plurality of sub-detection units, a plurality of the sub-detection units are connected in series in a safety detection circuit, and the safety detection circuit is electrically connected to the power supply;
  • An actuator the actuator is connected in series in the safety detection circuit
  • a feedback control component includes a controller connected between the safety detection circuit and the power supply, the controller is configured to attenuate the electrical signal in the safety detection circuit according to control station
  • the power supply mentioned above provides power.
  • the present disclosure provides an elevator power control device.
  • the attenuated electrical signals generated by the multiple sub-detection units can be fed back to the controller to facilitate the controller to control the adjustment of the power supply. output voltage, improve the stability of the actuator, and achieve the effects of high efficiency, energy saving and safe use.
  • the feedback control component further includes a circuit connector, the circuit connector has at least one connection interface, the connection interface is electrically connected to the safety detection circuit, and the controller is connected to the circuit connector.
  • the circuit connector has one connection interface, and the connection interface is electrically connected to the negative terminals of a plurality of the sub-detection units.
  • connection interfaces there are at least two connection interfaces, and each of the connection interfaces is electrically connected to the negative terminal of each of the sub-detection units.
  • it also includes a main control device, and the sub-detection units are all communicatively connected with the main control device.
  • the controller is configured to detect at least one of a voltage drop and a current drop in the safety detection circuit through the circuit connection.
  • the feedback control component further includes an analog-to-digital converter, and the analog-to-digital converter is connected between the circuit connector and the controller.
  • the actuator includes a contactor, and the contactor is configured to control the on-off state of the elevator operating circuit.
  • the contactor is connected in series in the safety detection circuit.
  • the plurality of sub-detection units at least include a machine room safety detection unit, a hoistway safety detection unit, a car top safety detection unit, a front car door safety detection unit, a rear car door safety detection unit, a front hall door safety detection unit, and a rear hall door safety detection unit.
  • Safety detection unit a machine room safety detection unit, a hoistway safety detection unit, a car top safety detection unit, a front car door safety detection unit, a rear car door safety detection unit, a front hall door safety detection unit, and a rear hall door safety detection unit.
  • the safety detection circuit is also connected in series with a frequency converter, and the frequency converter is communicatively connected with the main control device.
  • the actuator further includes a main switch connected in series to the safety detection circuit.
  • the power supply is a DC power supply.
  • the power supply is an AC power supply and a rectifier circuit electrically connected to the AC power supply.
  • the present disclosure also provides an elevator system, including the above-mentioned elevator power control device.
  • the elevator power control device and elevator system provided by the present disclosure detect and compensate for the electrical signal attenuation in the safety detection circuit by configuring the feedback control component, thereby improving the stability of the safety detection circuit and elevator operation. It can solve the loop interference problem caused by too long safety detection circuit and improve the stability of contactor operation and electrical Safety in using ladders.
  • the elevator power control device and elevator system provided by the present disclosure can be used to monitor the consistency of the voltage of the safety detection circuit, determine the contact status of the sub-detection unit, and improve the safety of use.
  • Figure 1 is an elevator safety circuit diagram in related technology
  • Figure 2 is an elevator safety circuit diagram in yet another related technology
  • Figure 3 is an elevator safety circuit diagram in yet another related art
  • Figure 4 is an elevator safety circuit diagram provided in some embodiments of the present disclosure.
  • Figure 5 is an elevator safety circuit diagram provided in some embodiments of the present disclosure.
  • Figure 6 is an enlarged view of the optocoupler in Figures 4 and 5 of the present disclosure.
  • Figure 7 is a voltage and current monitoring circuit diagram in some embodiments of the present disclosure.
  • Figure 8 is a voltage and current monitoring circuit diagram in some embodiments of the present disclosure.
  • the connections of all electrical safety devices should be designed in accordance with the design standard that "the action of any one of the electrical safety devices can stop the elevator."
  • the electrical safety devices 221 are connected in series to control the operation and stopping of the elevator.
  • the electrical safety devices 221 in the elevator are placed in the machine room, hoistway, The location of the landing door, car top, and pit, so the electrical safety device 221 of the entire elevator is connected in series to all the above locations.
  • the line of the safety detection circuit is very long. Calculated based on the elevator lifting height of 100 meters, the line of the elevator safety detection circuit is long.
  • the traditional safety loop power supply voltage usually adopts AC 220Vac or 110Vac generated by a transformer, which will inevitably cause loop interference problems, loop voltage drop problems, loop path problems, and electrical component contacts of the elevator safety detection circuit. Aging causes a series of problems such as excessive loop resistance. After the contacts of electrical components are used for a long time, the contact resistance of the contacts will increase due to dust pollution, oxidation, vulcanization, and insufficient stroke of the contacts themselves, thereby increasing the safety circuit of the elevator. Voltage drop, these problems affect the stability and safety of elevator operation. Although the above problems can be solved by increasing the cable diameter of the elevator safety detection circuit and increasing the transformer capacity, this will increase the production and design costs.
  • the elevator power control device and elevator system provided by the present disclosure, by setting up a feedback control component, can attenuate the electrical signals generated by multiple sub-detection units and feed them back to the controller, which facilitates the controller to control the power supply to adjust the output voltage and improve execution.
  • the stability of the components achieves the effects of high efficiency, energy saving and safe use.
  • an elevator power control device which includes: a power supply 100, a safety detection component, an actuator 210 and a feedback control component.
  • the safety detection component includes a plurality of sub-detection units 220, and the plurality of sub-detection units 220 are connected in series.
  • the actuator 210 is connected in series in the safety detection circuit, and the safety detection circuit is electrically connected to the power supply 100;
  • the feedback control component includes a controller 310, and the controller 310 is connected between the safety detection circuit and the power supply 100 to control
  • the controller 310 is configured to control the power supply 100 to provide power according to the attenuation of the electrical signal in the safety detection circuit.
  • the present disclosure provides an elevator power control device.
  • the electrical signal attenuation generated by multiple sub-detection units 220 can be fed back to the controller 310, so that the controller 310 can control the power supply 100 to adjust the output voltage and improve the actuator. 210 stability, achieving high efficiency, energy saving and safe use. Even if the multiple sub-detection units 220 are located in relatively scattered locations such as machine rooms, hoistways, car roofs, etc., making the lines of the safety detection circuit long, the power supply can be controlled by timely feedback of the electrical signal attenuation in the safety detection circuit. 100 adjusts the output voltage to compensate for the electrical signal attenuation in the safety detection circuit, thereby improving the stability of the safety detection circuit and elevator operation.
  • the party The project does not require additional production and design costs and is easy to use.
  • the present disclosure provides an elevator power control device which may be a circuit board.
  • some components such as the actuator 210 and the power supply 100 may also be located on the circuit board.
  • the electrical signals generated by the plurality of sub-detection units 220 may include at least one of a voltage difference and a current difference across the plurality of sub-detection units 220 .
  • the feedback control component further includes a circuit connector 320.
  • the circuit connector 320 has at least one connection interface 321.
  • the connection interface 321 is electrically connected to the safety detection circuit, and the controller 310 is connected to the circuit connector 320. .
  • the circuit connector 320 may be a circuit board, and the connection interface 321 may be a serial interface or a parallel interface.
  • the circuit connector 320 has a connection interface 321 , and the connection interface 321 is electrically connected to the negative terminals of the plurality of sub-detection units 220 . Voltage sampling and current sampling are performed at the negative terminals of the plurality of sub-detection units 220 , and the voltages or currents at the negative terminals of the plurality of sub-detection units 220 are transmitted to the controller 310 through the circuit connector 320 .
  • the controller 310 is configured to detect at least one of a voltage drop and a current drop in the safety detection circuit through the circuit connection 320 .
  • the controller 310 may be a Micro Controller Unit (MCU for short).
  • the feedback control component further includes an analog-to-digital converter, and the analog-to-digital converter is connected between the circuit connection 320 and the controller 310 .
  • the analog-to-digital converter that is, the A/D converter, is used to convert the input voltage signal into a digital signal and transmit it to the controller 310 .
  • the actuator 210 includes a contactor, the contactor is configured to control the on-off state of the elevator operating circuit, and the contactor is connected in series in the safety detection circuit.
  • the contactor includes a first contactor 211 and a first contactor 212. Only when the electrical safety device 221 of each sub-detection unit 220 is normally connected, the first contactor 211 and the first contactor 211 are connected. Only when the controller 212 is closed can the elevator operation circuit be connected, and power can be supplied to the motor to realize the operation of the elevator.
  • the elevator power control device further includes a main control device 400, and the sub-detection units 220 are all communicatively connected to the main control device 400.
  • the main control device 400 may be a main control board, including a Micro Controller Unit (MCU).
  • MCU Micro Controller Unit
  • the sub-detection unit 220 may convert high voltage into low voltage through a photoelectric coupler 700 signal, the optocoupler 700 has good anti-interference ability and can produce good isolation effect on electrical signals.
  • the main control device 400 is communicatively connected with the controller 310 . It is convenient for the main control device 400 to send elevator working status information to the controller 310.
  • the communication connection method can be used to facilitate the transmission of data signals. It is no longer limited to the respective layout positions of the main control device 400 and the controller 310, and is convenient to use.
  • the above communication connection includes but is not limited to at least one of Bluetooth connection, wired data connection and wireless signal network connection, and is used to realize information transfer between the sub-detection unit 220 and the main control device 400 .
  • the controller 310 is connected between the safety detection circuit and the power supply 100 .
  • the controller 310 may be electrically connected between the safety detection circuit and the power supply 100 .
  • the plurality of sub-detection units 220 at least include a machine room safety detection unit, a hoistway safety detection unit, a car top safety detection unit, a front car door safety detection unit, a rear car door safety detection unit, and a front hall door safety unit. Detection unit, rear hall door safety detection unit. It is easy to understand that the machine room safety detection unit, hoistway safety detection unit, car roof safety detection unit, front car door safety detection unit, rear car door safety detection unit, front hall door safety detection unit, and rear hall door safety detection unit are each connected in series There is no specific limit here on the order.
  • the machine room safety detection unit, hoistway safety detection unit, car roof safety detection unit, front car door safety detection unit, rear car door safety detection unit, front hall door safety detection unit, and rear hall door safety detection unit respectively include multiple electrical Safety device 221, in order to ensure the safe operation of the elevator, the elevator can run only when the electrical safety devices 221 of each sub-detection unit 220 are working normally. Otherwise, the elevator will stop running.
  • the safety detection circuit further includes a frequency converter 500 , and the frequency converter 500 is communicatively connected to the main control device 400 .
  • the main function of the inverter 500 is to achieve energy saving and speed regulation by changing the frequency.
  • the inverter 500 and the contactor are used to control the motor movement of the elevator at the same time, so that the elevator operation efficiency is improved, the operation is smooth, and the service life is extended.
  • the actuator 210 further includes a main switch 600 connected in series to the safety detection circuit.
  • the power supply 100 is a DC power supply.
  • the output modulation range of the power supply 100 is 48 ⁇ 56VDC.
  • Voltage sampling or current sampling is performed at the end of the safety detection circuit to automatically adjust the output voltage of the safety detection circuit.
  • the adjustment range and capacity of the output voltage of the safety detection circuit are selected according to the safety detection. Select the rated operating voltage and current of the load at the end of the circuit.
  • the power supply 100 is a DC power supply, and its output can be modulated in a range of 48 to 56 VDC.
  • Current sampling and voltage sampling are performed at the end of the safety detection circuit, and the output voltage of the safety detection circuit is automatically adjusted.
  • the safety detection circuit The adjustment range and capacity of the output voltage are selected according to the rated operating voltage and current of the load at the end of the safety detection circuit.
  • the controller 310 and the power supply 100 are electrically connected through a voltage and current monitoring circuit.
  • the voltage and current monitoring circuit is shown in FIG. 7 .
  • the resistor R1 is electrically connected to the power supply 100.
  • the voltage, The output end of the current monitoring circuit is electrically connected to the controller 310, and the voltage and current monitoring circuits stabilize voltage and current.
  • the voltage and current monitoring circuit shown in FIG. 8 can be built into the power supply 100 to stabilize the voltage and current.
  • the output terminals of the voltage and current monitoring circuit are connected to the control circuit.
  • Device 310 is electrically connected.
  • the elevator system When working, the elevator system has multiple preset working modes. When the working modes are switched, the main control device 400 transmits the switching signal of the working mode to the controller 310, and the controller 310 attenuates the electrical signal in the safety detection circuit.
  • the power supply 100 is controlled to provide power.
  • the preset working modes include standby mode, working mode, sleep mode, and open circuit mode.
  • each sub-detection unit 220 will produce a certain voltage drop. Therefore, the actual output voltage of the power supply 100 cannot be fully used for the operating circuit of the elevator.
  • the controller 310 needs to perform voltage learning of the preset working mode in advance. , learning the output voltage or output current of the power supply 100 in each preset mode.
  • the contactor does not work, and the main control device 400 transmits the signal in the standby mode to the controller 310.
  • the controller 310 controls the output voltage of the power supply 100 to be equal to the rated operating voltage of the safety detection circuit, which can make the safety detection circuit Maintain the normal operating voltage of the safety detection circuit.
  • the main control device 400 transmits the signal in the working mode to the controller 310.
  • the controller 310 controls the voltage output of the power supply 100 to accelerate the closing of the first contactor 211 and the first contactor 212.
  • the main control device 400 transmits the state signal of the engagement of the first contactor 211 and the first contactor 212 to the controller 310 , and the controller 310 detects it based on the circuit connector 320
  • the feedback voltage value controls the output voltage of the power supply 100 to be equal to the rated operating voltage of the contactor, thereby reducing the heating power consumption of the contactor.
  • the main control device 400 transmits the signal in the sleep mode to the controller 310.
  • the controller 310 controls the output voltage of the power supply 100 to be zero to reduce the standby power consumption and safety of various electronic components in the detection circuit.
  • the standby working time improves the service life of each electronic component.
  • the controller 310 controls the output voltage of the power supply 100 to be the maximum output voltage value of the power supply 100 .
  • the contactor When the contactor is closed, when the output voltage value of the power supply 100 is the maximum output voltage value of the power supply 100 and the feedback voltage value received by the controller 310 is the minimum value, it means that the contacts in the safety detection circuit are aging.
  • the main control device 400 After the main control device 400 completes this operation, it enters the locking mode and waits for maintenance personnel to perform maintenance to prevent the elevator from causing safety accidents due to the aging of the safety detection circuit contacts.
  • the controller 310 locks the fault and notifies the main control device 400 through communication. Only by manually releasing the lock can the normal operation of the elevator be restored and safety performance improved.
  • the optimal working voltage of the contactor is 48V, and the optimal working current is 100mA.
  • the output voltage of the regulated power supply 100 is 52VDC, of which 4V is caused by the excessive length of the safety detection circuit. voltage attenuation.
  • the status monitoring of the contacts of the safety detection circuit can be performed at certain intervals. After data comparison, it can be determined in advance that there is a contact aging problem in the safety detection circuit, giving early warning and detecting faults to avoid safety accidents. For example, through voltage learning of the working mode, it is known that the output voltage of the power supply 100 is 48VDC and the current in the safety detection circuit is 10mA.
  • connection interfaces 321 there are at least two connection interfaces 321 , and each connection interface 321 is correspondingly connected to the negative terminal of each sub-detection unit 220 .
  • connection interfaces 321 there are multiple connection interfaces 321 , the number of connection interfaces 321 is greater than or equal to the number of each sub-detection unit 220 , and each connection interface 321 is connected to the negative terminal of each sub-detection unit 220 . , used to feed back the output voltage or current of the negative terminal of each sub-detection unit 220 to the controller 310, so that the controller 310 can control the output voltage value of the power supply 100.
  • Series connection in this disclosure refers to electrical series connection, including but not limited to using wires such as cables to achieve series connection.
  • the power supply 100 is an AC power supply and a rectifier circuit electrically connected to the AC power supply. It is easy to understand that the rectifier circuit is a circuit that converts AC power into DC power, so that the elevator power control device provided by the present disclosure is suitable for AC power and can be connected to an external power grid.
  • the present disclosure also provides an elevator system, which includes an elevator and the above-mentioned elevator power control device, and also includes a traction system that moves the elevator.
  • an elevator system which includes an elevator and the above-mentioned elevator power control device, and also includes a traction system that moves the elevator.
  • the elevator power control device and elevator system provided by the present disclosure, by setting up a feedback control component, feed back the electrical signal attenuation in the safety detection circuit to the controller 310, so that the controller 310 can control the power supply 100 to select an appropriate output voltage for power supply. Solve the problem of loop interference caused by too long safety detection circuit and improve the stability of contactor operation.
  • the elevator power control device and elevator system provided by the present disclosure can be used to monitor the consistency of the voltage of the safety detection circuit and determine the contact status of the sub-detection unit, thereby improving the safety and good use experience, and improving the user's understanding of the elevator product. Trust.
  • first and second are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, features defined as “first” and “second” may explicitly or implicitly include at least one of these features.
  • “plurality” means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.
  • connection In this disclosure, unless otherwise explicitly stated and limited, the terms “installation”, “connection”, “connection”, “fixing” and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated into one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interactive relationship between two elements, unless otherwise specified restrictions. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.
  • a first feature being “on” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features may be in indirect contact through an intermediary. touch.
  • the terms “above”, “above” and “above” the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature.
  • "Below”, “below” and “beneath” the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.
  • references to the terms “one embodiment,” “some embodiments,” “an example,” “specific examples,” or “some examples” or the like means that specific features are described in connection with the embodiment or example. , structures, materials, or features are included in at least one embodiment or example of the present disclosure. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Elevator Control (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)

Abstract

Dispositif de commande d'alimentation électrique d'ascenseur et système d'ascenseur. Le dispositif de commande d'alimentation électrique d'ascenseur comprend : une alimentation électrique, un ensemble de vérification de sécurité, un élément d'exécution et un ensemble de commande de rétroaction ; l'ensemble de vérification de sécurité comprend une pluralité d'unités de sous-vérification ; la pluralité d'unités de sous-vérification est connectée en série dans un circuit de vérification de sécurité ; le circuit de vérification de sécurité est électriquement connecté à l'alimentation électrique ; l'élément d'exécution est connecté en série dans le circuit de vérification de sécurité ; l'ensemble de commande de rétroaction comprend un dispositif de commande ; le dispositif de commande est connecté entre le circuit de vérification de sécurité et l'alimentation électrique ; le dispositif de commande est configuré pour commander, en fonction d'une atténuation de signal électrique dans le circuit de vérification de sécurité, l'alimentation électrique pour une alimentation électrique.
PCT/CN2023/079669 2022-03-14 2023-03-03 Dispositif de commande d'alimentation électrique d'ascenseur et système d'ascenseur WO2023174078A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2023236513A AU2023236513A1 (en) 2022-03-14 2023-03-03 Elevator power supply control device and elevator system

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Application Number Priority Date Filing Date Title
CN202220555366.5U CN217417797U (zh) 2022-03-14 2022-03-14 电梯电源控制装置及电梯系统
CN202220555366.5 2022-03-14

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Publication number Priority date Publication date Assignee Title
CN217417797U (zh) * 2022-03-14 2022-09-13 菱王电梯有限公司 电梯电源控制装置及电梯系统

Citations (6)

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Publication number Priority date Publication date Assignee Title
US6446760B1 (en) * 1999-10-08 2002-09-10 Inventio Ag Safety circuit for an elevator installation
CN101573284A (zh) * 2007-01-03 2009-11-04 通力股份公司 电梯安全配置
CN105236251A (zh) * 2015-11-23 2016-01-13 黄一宸 一种电梯门联锁电路/安全电路故障检测装置及方法
CN110482355A (zh) * 2019-09-16 2019-11-22 深圳市松达电梯有限公司 一种电梯门锁检测电路及装置
CN112327984A (zh) * 2020-10-16 2021-02-05 苏州汇川技术有限公司 安全回路电压调节电路
CN217417797U (zh) * 2022-03-14 2022-09-13 菱王电梯有限公司 电梯电源控制装置及电梯系统

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6446760B1 (en) * 1999-10-08 2002-09-10 Inventio Ag Safety circuit for an elevator installation
CN101573284A (zh) * 2007-01-03 2009-11-04 通力股份公司 电梯安全配置
CN105236251A (zh) * 2015-11-23 2016-01-13 黄一宸 一种电梯门联锁电路/安全电路故障检测装置及方法
CN110482355A (zh) * 2019-09-16 2019-11-22 深圳市松达电梯有限公司 一种电梯门锁检测电路及装置
CN112327984A (zh) * 2020-10-16 2021-02-05 苏州汇川技术有限公司 安全回路电压调节电路
CN217417797U (zh) * 2022-03-14 2022-09-13 菱王电梯有限公司 电梯电源控制装置及电梯系统

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