Three-position switch control device

Abstract

The utility model relates to power equipment, in particular to a three-position switch control device, which comprises a power supply PM, a motor controller MC, a switching value signal acquisition DI, a switching value output DO, a communication COM, a local debugging USB and a state indicator DL. An input power supply of the device is AC220V, a control motor is a direct current brush motor, the device is provided with ten switching value signal input loops used for detecting three-station mechanism contact position and circuit breaker position signals, three switching value output loops used for circuit breaker opening and closing operation and alarm output of a three-station switch, and a COM interface supporting Modbus-RTU, an ETH interface, a Modbus-TCP and a USB-B interface. The five state indicating lamps are used for indicating the state of the control device. The device can realize remote centralized operation of the three-station mechanism and the circuit breaker mechanism of the three-station switch, has the functions of three-station mechanism motor stalling judgment, disconnection detection and internal control failure detection, is convenient for field debugging, and realizes flexible control of the three-station switch.

Description

Technical Field

[0001] This utility model relates to a power equipment, and more particularly to a three-position switch control device. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this utility model and does not constitute prior art.

[0003] The power distribution network is a crucial link in the entire power system, directly transmitting electricity to users. Therefore, its safe operation is paramount. Three-position switches are commonly used as distribution switches to prevent accidents. Compared to ordinary switches, three-position switches typically consist of a circuit breaker and a three-position mechanism. Unlike a circuit breaker, the three-position mechanism usually requires a dedicated circuit to operate the disconnecting and closing of the isolating switch and the grounding switch.

[0004] Existing three-position switch control devices only support manual local operation or low-speed serial communication control, which is difficult to meet the requirements of remote network operation in substations, and also difficult to meet the requirements of flexible local debugging through programming and parameter modification.

[0005] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0006] The purpose of this invention is to provide a three-position switch control device that can directly debug the central control through local debugging, thereby achieving flexible control of the three-position switch.

[0007] To achieve the above objectives, this utility model discloses a three-position switch control device for controlling the three-position switch. The three-position switch control device consists of a power supply PM, a motor control MC, a switch input DI, a switch output DO, remote communication ETH and COM, local debugging USB, a status display DL, and a central control CM.

[0008] The power supply PM converts the input power into motor drive power and control power; the motor control MC controls the forward and reverse rotation of the motor in the three-position mechanism and performs stall detection, motor disconnection detection, and internal control failure detection on the motor; the digital input DI collects the contact positions of the three-position mechanism and the circuit breaker positions; the digital output DO controls the opening and closing of the circuit breaker; the remote communication ETH and COM are used for the network control function of the central control CM; the local debugging USB is used to set the device parameters of the central control CM; the status display DL indicates the operating status of the three-position switch via LEDs; and the central control CM performs all logical judgments.

[0009] Furthermore, the motor control MC includes relay RLY1, relay RLY2, MOSFET Q1, freewheeling diode D1 for the freewheeling motor winding, Hall current sensor HR, control failure detection circuit S1, and motor disconnection detection circuit S2.

[0010] The relay RLY1 is used to switch the rotation direction of the brushed motor of the three-position switch; the relay RLY2 is used to disconnect the motor control MC from the power supply PM; the MOSFET Q1 is used to control the forward and reverse rotation of the motor of the three-position switch; the freewheeling diode D1 is used to prevent damage to the MOSFET Q1 when the motor of the three-position switch stops; the Hall current sensor HR is used to collect the motor winding current of the three-position switch; the control failure detection circuit S1 is used to detect the circuit signal of the power supply PM when the three-position mechanism is not executed; and the motor disconnection detection circuit S2 is used to detect the circuit signal between the MOSFET Q1 and the motor when the three-position mechanism is not executed.

[0011] The control failure detection circuit S1 and the motor disconnection detection circuit S2 have the same structure. The control failure detection circuit S1 or the motor disconnection detection circuit S2 includes a node K1 for connecting to the positive terminal of the power supply, a node K2 for connecting to the negative terminal of the power supply, a node S for connecting to the central control CM, and an optocoupler U1 for electrically isolating and transmitting signals between the nodes K1, K2 and S.

[0012] Based on the above technical solution, the beneficial effects of this utility model are as follows:

[0013] This utility model's three-position switch control device can achieve remote centralized operation of the three-position switch mechanism and circuit breaker via remote communication ETH and COM and local debugging USB. It has the functions of motor stall detection, wire breakage detection and internal control failure detection, which facilitates on-site debugging and reduces the workload of operators.

[0014] To further understand the features and technical content of this utility model, please refer to the following detailed description and drawings of this utility model. However, the drawings provided are for reference and illustration only and are not intended to limit this utility model. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram illustrating the composition principle of a three-position switch control device provided in the embodiments of this specification;

[0017] Figure 2 This is a schematic diagram of the power supply PM principle of a three-position switch control device provided in the embodiments of this specification;

[0018] Figure 3 This is a schematic diagram of the motor control MC principle of a three-position switch control device provided in the embodiments of this specification;

[0019] Figure 4 This is a schematic diagram of the control failure detection circuit S1 and the motor disconnection detection circuit S2 of a three-position switch control device provided in the embodiments of this specification; Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. This utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this utility model. Furthermore, the accompanying drawings of this utility model are for simple illustration only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this utility model in detail, but the disclosed content is not intended to limit the scope of protection of this utility model.

[0022] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0023] Please see Figure 1 This embodiment provides a three-position switch control device for controlling a three-position switch. The three-position switch includes a three-position mechanism and a circuit breaker. The three-position switch control device consists of a power supply PM, a motor control MC, a switch input DI, a switch output DO, remote communication ETH and COM, local debugging USB, a status display DL, and a central control CM.

[0024] The system includes: a power supply (PM) to convert input power into motor drive and control power; a motor control (MC) to control the forward and reverse rotation of the motor in the three-position mechanism, and to detect stall, open circuit, and internal control failure of the motor; a digital input (DI) to collect the contact positions and circuit breaker positions of the three-position mechanism; a digital output (DO) to control the opening and closing of the circuit breaker; remote communication (ETH and COM) for the network control function of the central control (CM); a local debugging USB to set the device parameters of the central control (CM); a status display (DL) to indicate the operating status of the three-position switch via LEDs; and the central control (CM) to complete all logical judgments.

[0025] Please see Figure 2 The power supply PM converts the input power into two control power supplies (for the central control CM) and a motor drive power supply (for the motor control MC). One of the two control power supplies is used by the internal CPU, and the other is used for external control. The power supply PM input is AC220V±10%. It first undergoes a filtering and protection circuit with a maximum current protection of 4A. After full-bridge rectification, it is used as the DC-DC conversion input and the motor drive power supply, respectively.

[0026] In one possible embodiment, the ETH in the remote communication ETH and COM has Ethernet communication capability and supports Modbus-TCP, which facilitates connection to the master station for centralized network control of multiple three-station mechanisms. The COM in the remote communication ETH and COM has serial communication capability and supports Modbus-RTU, which facilitates connection to the master station for centralized network control of multiple three-station mechanisms.

[0027] In one possible embodiment, the local debugging USB has a serial terminal function, which is used to modify the motor stall judgment parameters and the communication parameters of the remote communication ETH and COM.

[0028] In one possible embodiment, the digital output DO is used to implement the opening and closing operations of the circuit breaker mechanism, and the digital output section is a 24VDC wet contact.

[0029] In one possible embodiment, the status indicator DL ​​is used to locally display the status of the three-position switch control device, including multiple indicator lights, including a green power indicator light that is always on when the power is normal, a green running indicator light that flashes at a frequency of 1Hz during normal operation, a green closed position indicator, a green open position indicator, a green grounding position indicator, and a red abnormal status indicator.

[0030] In one possible embodiment, see Figure 3 and Figure 4The motor control MC includes relays RLY1 and RLY2, a MOSFET Q1, a freewheeling diode D1 for the motor winding, a Hall current sensor HR, a control failure detection circuit S1, and a motor disconnection detection circuit S2. Relay RLY1 is used to switch the rotation direction of the brushed motor in the three-position switch; relay RLY2 is used to disconnect the motor control MC from the power supply PM; MOSFET Q1 controls the forward and reverse rotation of the motor in the three-position switch; the freewheeling diode D1 prevents damage to MOSFET Q1 when the motor in the three-position switch stops; the Hall current sensor HR collects the current of the motor winding in the three-position switch; the control failure detection circuit S1 detects the circuit signal of the power supply PM when no three-position mechanism action is performed; and the motor disconnection detection circuit S2 detects the power supply PM when no action is performed. When the three-station mechanism is in operation, the circuit signal between MOSFET Q1 and the motor is detected. The motor start control process is as follows: first, control relay RLY1 to switch the direction of the motor winding current, then close relay RLY2, and then turn on MOSFET Q1 to execute the rotation of the motor. The motor stop control process is as follows: first, turn off MOSFET Q1, delay for 2 seconds and then open relay RLY2, and then control the coil of relay RLY1 to be de-energized. The control failure detection circuit S1 and the motor disconnection detection circuit S2 have the same structure. The control failure detection circuit S1 or the motor disconnection detection circuit S2 includes a node K1 for connecting to the positive terminal of the power supply, a node K2 for connecting to the negative terminal of the power supply, a node S for connecting to the central control CM, and an optocoupler U1 for electrical isolation and signal transmission between nodes K1, K2 and S.

[0031] Further, please see Figure 4 In this embodiment, the freewheeling diode D1 of the freewheeling motor winding is selected with a reverse withstand voltage of 1kV and a rated current of 3A. The relay RLY1 is selected as an 8A double C-type node relay HF115F / 005-2ZS4AF, the relay RLY2 is selected as a 5A single A-type node relay G5NB-1A-E-DC5V, the MOSFET Q1 is selected as a 600V 10A NMOS transistor STP10NK60ZFP, and the core MCU of the central control CM is selected as the CH32V307RCT6 chip. Figure 4 R1 and R2 in the figure are 22kΩ 3W through-hole power resistors.

[0032] The above-disclosed content is only a preferred and feasible embodiment of the present utility model, and is not intended to limit the scope of the patent application of the present utility model. Therefore, all equivalent technical changes made using the contents of the present utility model specification and drawings are included in the scope of the patent application of the present utility model.

[0033] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0034] Although this application has been described by way of examples, those skilled in the art will know that this application has many modifications and variations without departing from the spirit of this application, and it is intended that the appended embodiments include these modifications and variations without departing from this application.

Claims

1. A three-position switch control device, wherein, The three-position switch includes a three-position mechanism and a circuit breaker, characterized in that: the three-position switch control device consists of a power supply PM, a motor control MC, a switch input DI, a switch output DO, a remote communication ETH and COM, a local debugging USB, a status display DL, and a central control CM. The power supply PM converts the input power into motor drive power and control power; the motor control MC controls the forward and reverse rotation of the motor in the three-position mechanism and performs stall detection, motor disconnection detection, and internal control failure detection on the motor; the digital input DI collects the contact positions of the three-position mechanism and the circuit breaker positions; the digital output DO controls the opening and closing of the circuit breaker; the remote communication ETH and COM are used for the network control function of the central control CM; the local debugging USB is used to set the device parameters of the central control CM; the status display DL indicates the operating status of the three-position switch via LEDs; and the central control CM performs all logical judgments.

2. The three-position switch control device according to claim 1, characterized in that: The motor control MC includes relay RLY1, relay RLY2, MOSFET Q1, freewheeling diode D1 for the freewheeling motor winding, Hall current sensor HR, control failure detection circuit S1, and motor disconnection detection circuit S2. The relay RLY1 is used to switch the rotation direction of the brushed motor of the three-position switch; the relay RLY2 is used to disconnect the motor control MC from the power supply PM; the MOSFET Q1 is used to control the forward and reverse rotation of the motor of the three-position switch; the freewheeling diode D1 is used to prevent damage to the MOSFET Q1 when the motor of the three-position switch stops; the Hall current sensor HR is used to collect the motor winding current of the three-position switch; the control failure detection circuit S1 is used to detect the circuit signal of the power supply PM when the three-position mechanism is not executed; and the motor disconnection detection circuit S2 is used to detect the circuit signal between the MOSFET Q1 and the motor when the three-position mechanism is not executed. The control failure detection circuit S1 and the motor disconnection detection circuit S2 have the same structure. The control failure detection circuit S1 or the motor disconnection detection circuit S2 includes a node K1 for connecting to the positive terminal of the power supply, a node K2 for connecting to the negative terminal of the power supply, a node S for connecting to the central control CM, and an optocoupler U1 for electrically isolating and transmitting signals between the nodes K1, K2 and S.

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