Direct-current dual-motor forward and reverse rotation control and protector driving circuit

Abstract

The utility model relates to a direct-current dual-motor forward and reverse rotation control and protector driving circuit, and belongs to the technical field of motor control. Comprising a fuse connected with an alternating current control power supply, a rectification unit, a positive and negative control relay and a controller for controlling the positive and negative control relay, and the rectification unit is connected between the output side of the fuse and the positive and negative control relay. The direct current bus positive end and the direct current bus negative end of the output side of the positive and negative control relay are connected with a direct current positive bus and a direct current negative bus respectively, and the positive and negative control relay is electrically connected with the output end of the controller and receives control signals of the microcontroller. The current transformer is used for collecting the working current of the motor, the current signal rectifier bridge is coupled with the current transformer, a wire of the alternating current control power supply flows through the current transformer, and the boosting resistor is connected to the output side of the current signal rectifier bridge. The signal filter capacitor is connected between the output side of the boost resistor and the input end of the controller. The intelligent explosion-proof high-voltage power distribution device has the following beneficial effects that in the design of the intelligent explosion-proof high-voltage power distribution device, the dual-motor control and protection circuit is designed to be matched with the master controller to drive the operation of the electric chassis and the grounding switch direct current motor, and compared with a traditional handcart controller, the intelligent explosion-proof high-voltage power distribution device has the characteristics of smaller installation volume and lower control cost.

Description

Technical Field

[0001] The utility model relates to a direct current dual-motor forward and reverse rotation control and protector driving circuit, belonging to the technical field of motor control. Background Art

[0002] High-voltage switchgear is a commonly used power transmission and distribution equipment. A circuit breaker trolley is installed in the high-voltage switchgear. The circuit breaker trolley moves in the high-voltage switchgear and performs various operations. A grounding knife is installed in the high-voltage switchgear. When the grounding knife is opened, the high-voltage switchgear is disconnected from the earth. When the grounding knife is closed, the high-voltage switchgear is short-circuited with the earth.

[0003] The patent application with patent number CN202310371699. discloses an online network intelligent high-voltage cabinet. It includes an electric trolley, an electric grounding knife, a comprehensive protection device, an electric controller, an intelligent control, a communication management machine, a touch display, a remote transmission module, a mobile phone APP, a computer terminal, and a sensor module; the electric trolley and the electric grounding knife are connected to the electric controller, the comprehensive protection device, the electric controller, and the intelligent control are connected to the communication management machine, the communication management machine is also connected to the touch display and the remote transmission module, the remote transmission module is also connected to the mobile phone APP and the computer terminal; the sensor module is connected to the communication management machine.

[0004] Although the above patent can realize the functions of the high-voltage cabinet, the current technical considerations are not comprehensive and have the following disadvantages: for the intelligent explosion-proof high-voltage vacuum distribution device supporting electric trolleys (electric chassis trolleys) and electric grounding knives, the trolley controller of the conventional high-voltage cabinet, when used in the intelligent explosion-proof high-voltage vacuum distribution device, is not highly compatible with other intelligent equipment of the explosion-proof high-voltage vacuum distribution device and needs to be controlled separately, resulting in complex lines and reduced intelligence level.

[0005] In order to solve one of the above problems and realize the intelligent control integration of energy-proof explosion-proof high-voltage vacuum distribution equipment, a DC dual-motor forward and reverse control and protector drive circuit is urgently needed. A DC motor forward and reverse control and protector drive circuit is added outside the controller, and the control logic of the trolley and the grounding knife is executed by the main controller. Utility Model Content

[0006] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is: how to drive the operation of the electric chassis vehicle and the grounding knife DC motor through the dual-motor control and protection circuit in cooperation with the main controller, and to this end provide a DC dual-motor forward and reverse control and protector drive circuit, which has the characteristics of smaller installation volume and lower control cost compared to the traditional trolley controller.

[0007] The DC dual-motor forward and reverse control and protector drive circuit described in the utility model is characterized by: comprising a fuse connected to an AC control power supply, a rectifier unit, a forward and reverse control relay, and a controller for controlling the forward and reverse control relay, the rectifier unit is connected between the output side of the fuse and the forward and reverse control relay, the DC bus positive end and the DC bus negative end on the output side of the forward and reverse control relay are respectively connected to the DC positive bus and the DC negative bus, the forward and reverse control relay is electrically connected to the output end of the controller to receive the control signal of the microcontroller, and also includes a signal filter capacitor, a boost resistor, a current transformer for collecting the working current of the motor, and a current signal rectifier bridge coupled to the current transformer, the wire of the AC control power supply flows through the current transformer, the boost resistor is connected to the output side of the current signal rectifier bridge, and the signal filter capacitor is connected between the output side of the boost resistor and the input end of the controller.

[0008] The AC control power supply is connected to the fuse, and the power flows through the current transformer, which samples the motor working current. The AC sampling signal is rectified by the current signal rectifier bridge to obtain a DC current signal, and the DC current signal is boosted by a boost resistor and filtered by a signal filter capacitor to obtain a standard voltage-type analog signal.

[0009] The AC control power passes through the fuse and then through a rectifier unit composed of four diodes to complete the conversion of the AC power into a DC control power.

[0010] The forward and reverse control relay is connected to the current power supply converted by the current conversion and sampling part. When the forward and reverse control relay is opened, the positive electrode of the DC power supply is output to the DC positive bus, and the negative electrode is output to the DC negative bus. When the forward and reverse control relay is opened, the positive electrode of the DC power supply is output to the negative DC bus, and the negative electrode is output to the DC positive bus, thereby realizing bus electrode switching.

[0011] Preferably, it also includes a 1# control relay connected between the 1# motor and the forward and reverse control relay, and a 2# control relay connected between the 2# motor and the forward and reverse control relay. The 1# control relay and the 2# control relay are connected to the forward and reverse control relays through the DC negative bus and the DC positive bus, and the 1# control relay and the 2# control relay are both electrically connected to the output end corresponding to the controller, and the control relay receives the control signal of the microcontroller.

[0012] Preferably, the fuse, rectifier unit, forward and reverse control relay, 1# control relay, 2# control relay, signal filter capacitor, boost resistor, and current transformer are all integrated on the same circuit board, and a terminal block connected to the controller is also provided on one side of the circuit board.

[0013] Preferably, the terminal block includes 12 pins, the first pin of the terminal block is connected to the fuse, the second pin is connected to the rectifier unit, the third pin and the fourth pin are connected to the signal filter capacitor, the fifth pin and the sixth pin are connected to the 1# control relay, the fifth pin and the sixth pin are connected to the 1# control relay, the seventh pin and the eighth pin are connected to the 2# control relay, the tenth pin, the eleventh pin and the twelfth pin are respectively connected to the 2# control relay, the 1# control relay and the forward and reverse control relay, and the 2# control relay, the 1# control relay and the forward and reverse control relay are all connected to the ninth pin through another set of wires.

[0014] Preferably, the rectifying unit is a full-bridge rectifier composed of four diodes.

[0015] Preferably, the controller PLC programmable controller controls whether the forward and reverse control relays, 1# control relay, and 2# control relay are powered respectively.

[0016] Preferably, the PLC programmable controller has a controller AD interface, a controller forward and reverse control interface, a motor 1# control interface, and a motor 2# control interface.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The DC dual-motor forward and reverse control and protector drive circuit described in the utility model is designed to cooperate with the main controller in the design of intelligent explosion-proof high-voltage power distribution equipment to drive the operation of the electric chassis vehicle and the grounding knife DC motor. Compared with the traditional trolley controller, it has the characteristics of smaller installation volume and lower control cost.

[0019] The reduced installation area of ​​components of the explosion-proof high-voltage power distribution device further reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0021] Figure 1 It is a schematic diagram of the structural principle of the utility model;

[0022] Figure 2 This is a schematic diagram of the structural principle of the controller of the utility model;

[0023] In the figure: 1-fuse 2-rectifier unit 3-forward and reverse control relay 4-1# control relay 5-2# control relay 6-signal filter capacitor 7-boost resistor 8-current transformer 9-current signal rectifier bridge 10-terminal block 11-DC negative bus 12-DC positive bus. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings: The utility model is further illustrated below through specific embodiments, but is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the invention should be included in the protection scope of the utility model.

[0025] Embodiment 1, as Figure 1-2 As shown, the DC dual-motor forward and reverse control and protector drive circuit includes a fuse 1 connected to an AC control power supply, a rectifier unit 2, a forward and reverse control relay 3, and a controller for controlling the forward and reverse control relay 3. The rectifier unit 2 is connected between the output side of the fuse 1 and the forward and reverse control relay 3. The DC bus positive end and the DC bus negative end on the output side of the forward and reverse control relay 3 are respectively connected to the DC positive bus 12 and the DC negative bus 11. The forward and reverse control relay 3 is electrically connected to the output end of the controller to receive the control signal of the microcontroller. It also includes a signal filter capacitor 6, a boost resistor 7, a current transformer 8 for collecting the working current of the motor, and a current signal rectifier bridge 9 coupled to the current transformer 8. The wire of the AC control power supply flows through the current transformer 8. The boost resistor 7 is connected to the output side of the current signal rectifier bridge 9, and the signal filter capacitor 6 is connected between the output side of the boost resistor 7 and the input end of the controller.

[0026] Current conversion sampling part: fuse 1, rectifier unit 2, signal filter capacitor 6, boost resistor 7, current transformer 8, current signal rectifier bridge 9. The AC control power supply is connected to the fuse 1, and the power flows through the current transformer 8. The current transformer 8 samples the motor working current. The AC sampling signal is rectified by the current signal rectifier bridge 9 to obtain a DC current signal. The DC current signal is boosted by the boost resistor 7 and filtered by the signal filter capacitor 6 to obtain a standard voltage type analog signal.

[0027] The AC control power passes through the fuse 1 and then through the rectifier unit 2 composed of four diodes to complete the conversion of the AC power into a DC control power.

[0028] Embodiment 2, as Figure 1-2As shown, the DC dual-motor forward and reverse control and protector drive circuit includes a fuse 1 connected to an AC control power supply, a rectifier unit 2, a forward and reverse control relay 3, and a controller for controlling the forward and reverse control relay 3. The rectifier unit 2 is connected between the output side of the fuse 1 and the forward and reverse control relay 3. The DC bus positive end and the DC bus negative end on the output side of the forward and reverse control relay 3 are respectively connected to the DC positive bus 12 and the DC negative bus 11. The forward and reverse control relay 3 is electrically connected to the output end of the controller to receive the control signal of the microcontroller. It also includes a signal filter capacitor 6, a boost resistor 7, a current transformer 8 for collecting the working current of the motor, and a current signal rectifier bridge 9 coupled to the current transformer 8. The wire of the AC control power supply flows through the current transformer 8. The boost resistor 7 is connected to the output side of the current signal rectifier bridge 9, and the signal filter capacitor 6 is connected between the output side of the boost resistor 7 and the input end of the controller.

[0029] Furthermore, it also includes a 1# control relay 4 connected between the 1# motor and the forward and reverse control relay 3, and a 2# control relay 5 connected between the 2# motor and the forward and reverse control relay 3. The 1# control relay 4 and the 2# control relay 5 are connected to the forward and reverse control relay 3 through the DC negative bus 11 and the DC positive bus 12, and the 1# control relay 4 and the 2# control relay 5 are both electrically connected to the output end corresponding to the controller, and the control relay receives the control signal of the microcontroller.

[0030] Driving part: forward and reverse control relay 3, 1# control relay 4, 2# control relay 5, DC negative bus 11, DC positive bus 12. The forward and reverse control relay 3 is connected to the current power supply converted by the current conversion sampling part. When the forward and reverse control relay 3 opens, the positive pole of the DC power supply is output to the DC positive bus 12, and the negative pole is output to the DC negative bus 11. When the forward and reverse control relay 3 opens, the positive pole of the DC power supply is output to the DC negative bus 11, and the negative pole is output to the DC positive bus 12, so as to realize bus electrode switching.

[0031] Furthermore, the fuse 1, rectifier unit 2, forward and reverse control relay 3, 1# control relay 4, 2# control relay 5, signal filter capacitor 6, boost resistor 7, and current transformer 8 are all integrated on the same circuit board, and a terminal block 10 connected to the controller is also provided on one side of the circuit board.

[0032] Furthermore, the terminal block 10 includes 12 pins, the first pin of the terminal block 10 is connected to the fuse 1, the second pin is connected to the rectifier unit 2, the third pin and the fourth pin are connected to the signal filter capacitor 6, the fifth pin and the sixth pin are connected to the 1# control relay 4, the fifth pin and the sixth pin are connected to the 1# control relay 4, the seventh pin and the eighth pin are connected to the 2# control relay 5, the tenth pin, the eleventh pin and the twelfth pin are respectively connected to the 2# control relay 5, the 1# control relay 4 and the forward and reverse control relay 3, and the 2# control relay 5, the 1# control relay 4 and the forward and reverse control relay 3 are all connected to the ninth pin through another set of wires.

[0033] Furthermore, the rectifying unit 2 is a full-bridge rectifying bridge composed of four diodes.

[0034] Furthermore, the controller PLC programmable controller controls whether the forward and reverse control relays 3, 1# control relay 4, and 2# control relay 5 are powered respectively.

[0035] In the design of intelligent explosion-proof high-voltage vacuum power distribution equipment, the output interface of the master controller cannot directly control the rotation of the DC motor, and cannot directly sample the working current of the motor. Therefore, the function of the master controller is expanded by making a protection and control circuit board. The modification of the prior art in this specific implementation method lies in the hardware part, and the computer program involved is a simple program that can be easily realized by those skilled in the art using the existing computer program development platform and well-known programming methods.

[0036] Furthermore, the PLC programmable controller has a controller AD interface 21 , a controller forward and reverse control interface 22 , a motor 1# control interface 23 , and a motor 2# control interface 24 .

[0037] Motor 1# forward position signal 13, motor 1# reverse position signal 14, motor 2# forward position signal 15, motor 2# reverse position signal 16 are connected to the controller ID point as motor rotation position signal to the control to judge the motor position. Motor 1# forward button 17, motor 1# reverse button 18, motor 2# forward button 19, motor 2# reverse button 20 are connected to the controller ID point to send control signals. The controller AD interface 21 is connected to the motor working current analog signal interface, the forward and reverse control relay 3 is connected to the controller forward and reverse control interface 22, the 1# control relay 4 is connected to the motor 1# control interface 23, and the 2# control relay 5 is connected to the motor 2# control interface 24.

[0038] The working principle of the utility model is as follows: when the reverse position signal 14 of motor 1# is closed, it means that the reverse rotation of motor 1# is in place, and the SB3 button is pressed, KA2 (1# control relay 4) is activated, and the 1# motor is driven to rotate forward. When the forward position signal 13 of motor 1# is closed, the SB4 button is pressed, and KA1 (forward and reverse control relay 3) and KA2 (1# control relay 4) are activated at the same time, and the 1# motor is driven to rotate reversely.

[0039] Similarly: when the motor 2# reverse in-position signal 16 is closed, it means that the 2# motor has rotated in the reverse direction, and the SB5 button is pressed, KA3 (2# control relay 5) is activated, driving the 2# motor to rotate forward. When the motor 2# forward in-position signal 15 is closed, the SB6 button is pressed, and KA1 (forward and reverse control relay 3) and KA3 (2# control relay 5) are activated at the same time, driving the 2# motor to rotate in the reverse direction.

[0040] Motor 1# and motor 2# are the trolley and grounding knife motors respectively.

[0041] During the control process, the controller AD interface 21 receives the voltage analog signal of the motor working current sent by the drive circuit. When the motor working current is greater than the set protection current, the controller controls the motor to stop running.

[0042] The master controller controls and protects the DC motor from two aspects: control and protection. Protection: The motor working flow is collected through the current transformer, and the current is converted into a standard analog signal and transmitted to the master controller for protection; Control: The AC power source is converted into a DC source, and output to the controlled trolley and grounding knife motor through the relay.

[0043] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the present utility model is defined by the attached claims and their equivalents.

[0044] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A DC dual motor forward and reverse control and protector drive circuit, characterized in that: The invention comprises a fuse (1) connected to an AC control power supply, a rectifier unit (2), a forward and reverse control relay (3), and a controller for controlling the forward and reverse control relay (3); the rectifier unit (2) is connected between the output side of the fuse (1) and the forward and reverse control relay (3); the DC bus positive end and the DC bus negative end of the output side of the forward and reverse control relay (3) are respectively connected to the DC positive bus (12) and the DC negative bus (11); the forward and reverse control relay (3) is electrically connected to the output end of the controller and receives a control signal from the controller; the invention also comprises a signal filter capacitor (6), a boost resistor (7), a current transformer (8) for collecting the working current of the motor, and a current signal rectifier bridge (9) coupled to the current transformer (8); the conductor of the AC control power supply flows through the current transformer (8); the boost resistor (7) is connected to the output side of the current signal rectifier bridge (9); and the signal filter capacitor (6) is connected between the output side of the boost resistor (7) and the input end of the controller.

2. According to claim 1, the DC dual motor forward and reverse control and protector drive circuit is characterized in that: The invention also comprises a 1# control relay (4) connected between the 1# motor and the forward and reverse control relay (3), and a 2# control relay (5) connected between the 2# motor and the forward and reverse control relay (3), wherein the 1# control relay (4) and the 2# control relay (5) are connected to the forward and reverse control relay (3) via a DC negative bus (11) and a DC positive bus (12), and the 1# control relay (4) and the 2# control relay (5) are both electrically connected to the output end corresponding to the controller, and the control relay receives the control signal of the controller.

3. According to claim 2, the DC dual motor forward and reverse control and protector drive circuit is characterized in that: The fuse (1), the rectifier unit (2), the forward and reverse control relay (3), the 1# control relay (4), the 2# control relay (5), the signal filter capacitor (6), the boost resistor (7), and the current transformer (8) are all integrated on the same circuit board, and a terminal block (10) connected to the controller is also provided on one side of the circuit board.

4. The DC dual motor forward and reverse control and protector drive circuit according to claim 3 is characterized in that: The rectifier unit (2) is a full-bridge rectifier composed of four diodes.

5. The DC dual motor forward and reverse control and protector drive circuit according to claim 4, characterized in that: The controller is a PLC programmable controller, which controls whether the forward and reverse control relays (3), the 1# control relay (4), and the 2# control relay (5) are energized.

6. The DC dual motor forward and reverse control and protector drive circuit according to claim 5, characterized in that: The PLC programmable controller has a controller AD interface, a controller forward and reverse control interface, a motor 1# control interface, and a motor 2# control interface.

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