Control device and control method for circuit breaker transmission mechanism

Abstract

The present invention discloses a control device and a control method for a circuit breaker transmission mechanism. The control device includes a control module, a power module, a communication module, a position acquisition module and a motor drive module; the power module is connected to the control module, the communication module, the position acquisition module and the motor drive module to supply power; the communication module, the position acquisition module and the motor drive module are all connected to the control module; the communication module is used to establish a communication connection between the control module and a remote control terminal, so that the control module can receive opening and closing commands of the circuit breaker issued by the remote control terminal; the position acquisition module is used to detect the operating status of the transmission mechanism under the action of the control module and send the operating status of the transmission mechanism to the control module; the motor drive module is used to drive the motor of the transmission mechanism to rotate or stop under the action of the control module; the control module is also used to run a PID algorithm according to the operating status of the transmission mechanism and adjust the speed of the motor of the transmission mechanism through the motor drive module.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a control device and a control method for a circuit breaker transmission mechanism. Background Art

[0002] An intelligent circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, as well as closing, carrying, and interrupting current under abnormal circuit conditions within a specified timeframe. An intelligent circuit breaker generally consists of a contact system, arc extinguishing system, operating mechanism, motor transmission mechanism, trip unit, and housing.

[0003] Currently, most intelligent circuit breakers on the market use DC motors to drive the transmission mechanism, enabling remote control of the circuit breaker's opening and closing. However, because DC motors cannot be stopped instantaneously, the transmission mechanism is prone to overshoot, leading to inaccurate opening and closing positions and timings, as well as motor jamming. This poses a serious safety hazard and increases the difficulty of installation and commissioning. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the first embodiment of the present invention provides a control device for a circuit breaker transmission mechanism, which can effectively avoid problems such as inaccurate opening and closing positions and opening and closing times of the circuit breaker due to overshoot of the transmission mechanism, thereby improving safety.

[0006] A second embodiment of the present invention provides a method for controlling a circuit breaker transmission mechanism.

[0007] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0008] According to a first embodiment of the present invention, a control device for a circuit breaker transmission mechanism includes a control module, a power module, a communication module, a position acquisition module, and a motor drive module; the power module is connected to the control module, the communication module, the position acquisition module, and the motor drive module to supply power; the communication module, the position acquisition module, and the motor drive module are all connected to the control module;

[0009] The communication module is used to establish a communication connection between the control module and the remote control terminal, so that the control module can receive the opening and closing commands of the circuit breaker issued by the remote control terminal;

[0010] The position acquisition module is used to detect the operating status of the transmission mechanism under the action of the control module and send the operating status of the transmission mechanism to the control module;

[0011] The motor driving module is used to drive the motor of the transmission mechanism to rotate or stop under the action of the control module;

[0012] The control module is further configured to run a PID algorithm according to the operating state of the transmission mechanism and adjust the speed and torque of the motor of the transmission mechanism through the motor drive module.

[0013] According to some embodiments of the present invention, the power supply module includes an AC power supply and a transformer T, and the AC power supply is connected to the primary winding of the transformer T; the communication module includes a bidirectional breakdown diode VD, a signal transmitting branch, a filtering branch and a signal receiving branch; the bidirectional breakdown diode VD, the signal transmitting branch and the filtering branch are connected to the secondary winding of the transformer T, and the signal receiving branch is connected to the filtering branch.

[0014] According to some embodiments of the present invention, the signal transmission branch includes a tenth capacitor C10, a third resistor R3, a first Schottky diode D1, a second Schottky diode D2, a fourteenth capacitor C14 and a fourth resistor R4; one terminal of the secondary winding of the transformer T is connected in series to a transmission pin TX_N of the control module through the tenth capacitor C10 and the third resistor R3; the other terminal of the secondary winding of the transformer T is connected in series to another transmission pin TX_P of the control module through the fourteenth capacitor C14 and the fourth resistor R4; one end of the parallel branch composed of the first Schottky diode D1 and the second Schottky diode D2 is connected to the node between the tenth capacitor C10 and the third resistor R3, and the other end is connected to the node between the fourteenth capacitor C14 and the fourth resistor R4.

[0015] According to some embodiments of the present invention, the signal receiving branch includes a first capacitor C1, a fifty-fifth resistor R55, a third Schottky diode D3, a fourth Schottky diode D4, a third capacitor C3 and a fourth capacitor C4; the first capacitor C1 is connected to the filtering branch, and one end of the first capacitor C1 is connected to a receiving pin RX_N of the control module through the fourth capacitor C4; the other end of the first capacitor C1 is connected to another receiving pin RX_P of the control module through the third capacitor C3; the fifty-fifth resistor R55 is connected in parallel with the first capacitor C1; the parallel branch composed of the third Schottky diode D3 and the fourth Schottky diode D4 is connected in parallel with the first capacitor C1.

[0016] According to some embodiments of the present invention, the power supply module also includes a second DC power supply unit; the position acquisition module includes a micro-limit switch SW, a seventh resistor R7 and a seventeenth capacitor C17; the first pin and the fourth pin of the micro-limit switch SW are grounded, the second pin and the third pin are connected to the ground through the seventeenth capacitor C17, and the second pin and the third pin are connected to the output end of the second DC power supply unit through the seventh resistor R7; the second pin and the third pin are connected to the PAO pin of the control module.

[0017] According to some embodiments of the present invention, the position acquisition module further includes a sensor TR, which is a potentiometer-type sensor; the first pin of the sensor TR is connected to the output end of the second DC power supply unit, the second pin is grounded, and the third pin is connected to the ADC2 pin of the control module.

[0018] According to some embodiments of the present invention, the power supply module also includes a first DC power supply unit; the motor drive module includes a drive chip U5, a twenty-fifth resistor R25 and a seventy-seventh capacitor C77; the NC pin and the INA pin of the drive chip U5 are suspended; the INB pin of the drive chip U5 is connected to the PWM pin of the control module through the twenty-fifth resistor R25; the VDD pin of the drive chip U5 is connected to the output end of the first DC power supply unit and is grounded through the seventy-seventh capacitor C77; the PGND pin and the AGND pin of the drive chip U5 are grounded; the OUTB pin of the drive chip U5 is connected to the negative pole of the motor of the transmission mechanism, and the OUTA pin is connected to the positive pole of the motor of the transmission mechanism.

[0019] According to some embodiments of the present invention, a load terminal voltage detection module is further included. The load terminal voltage detection module is connected to the control module and is used to detect the voltage of the load terminal under the action of the control module.

[0020] According to some embodiments of the present invention, a circuit temperature detection module is further included. The circuit temperature detection module is connected to the control module and is used to detect the temperature of the circuit under the action of the control module.

[0021] According to a second aspect of an embodiment of the present invention, a control method for a circuit breaker transmission mechanism is applied to the above-mentioned control device, the control device comprising a control module, a power module, a communication module, a position acquisition module, and a motor drive module; the power module is connected to the control module, the communication module, the position acquisition module, and the motor drive module to supply power; the communication module, the position acquisition module, and the motor drive module are all connected to the control module; the position acquisition module comprises a sensor and a micro travel switch; the sensor is a potentiometer-type sensor; the control method comprises the following steps:

[0022] Presetting a target position for the sensor to follow the rotation of the motor of the transmission mechanism; assigning the target position to a closed position or an open position of the circuit breaker; and using the voltage value of the ADC2 pin of the control module corresponding to the target position as a reference voltage value;

[0023] The control module receives a closing or opening command from a remote control terminal through the communication module;

[0024] The control module controls the motor driving module to drive the motor to rotate, and uses the voltage value of the ADC2 pin of the control module corresponding to the current position of the sensor as the current voltage value;

[0025] Determining whether a difference between the current voltage value and the reference voltage value is zero;

[0026] If the difference between the current voltage value and the reference voltage value is not zero, the sensor has not rotated to the target position, and the control module runs a PID algorithm according to the difference to adjust the duty cycle of the PWM waveform output by the control module, and adjusts the speed of the motor through the motor drive module;

[0027] If the difference between the current voltage value and the reference voltage value is zero, the sensor rotates to the target position, and the control module controls the motor driving module to drive the motor to stop rotating;

[0028] After the motor stops rotating, the control module determines whether the motor rotates to reach the target position according to the state change of the micro travel switch and the voltage at the load end.

[0029] The control device and control method in the above technical solution have at least the following beneficial effects:

[0030] The control module runs the PID algorithm according to the operating status of the transmission mechanism and adjusts the speed of the transmission mechanism's motor through the motor drive module, realizing controllable acceleration and deceleration of the motor according to the control algorithm; multiple tests are performed on the sensor, motor and micro-stroke switch to make the motor's stop position more accurate and prevent overshoot.

[0031] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0033] Figure 1 Schematic diagram of the structure of the transmission mechanism of an embodiment of the present invention;

[0034] Figure 2 A front view of a transmission mechanism according to an embodiment of the present invention;

[0035] Figure 3 It is a rear view of the transmission mechanism according to an embodiment of the present invention.

[0036] Figure 4 A schematic structural diagram of a turbine and a cam according to an embodiment of the present invention;

[0037] Figure 5 and Figure 6 A schematic structural diagram of a heart-shaped gear according to an embodiment of the present invention;

[0038] Figure 7 and Figure 8 A schematic structural diagram of an incomplete gear according to an embodiment of the present invention;

[0039] Figure 9 This is a schematic structural diagram of an operating handle according to an embodiment of the present invention;

[0040] Figure 10 A schematic structural diagram of a trip lever according to an embodiment of the present invention;

[0041] Figure 11 is a structural block diagram of a control device according to an embodiment of the present invention;

[0042] Figure 12 is a circuit schematic diagram of a control module according to an embodiment of the present invention;

[0043] Figure 13 A schematic circuit diagram of a portion of a power supply module according to an embodiment of the present invention;

[0044] Figure 14 This is a circuit diagram of a communication module and part of a power supply module according to an embodiment of the present invention;

[0045] Figure 15 This is a circuit diagram of a position acquisition module according to an embodiment of the present invention;

[0046] Figure 16 A circuit diagram of a motor drive module according to an embodiment of the present invention;

[0047] Figure 17 1 is a circuit schematic diagram of a load terminal voltage detection module according to an embodiment of the present invention;

[0048] Figure 18 1 is a circuit schematic diagram of a circuit temperature detection module according to an embodiment of the present invention;

[0049] Figure 19 FIG. 4 is a diagram showing the rotation position of the sensor according to an embodiment of the present invention.

[0050] Reference numerals:

[0051] Support 110, controllable motor 200, worm 300, turbine 400, cam 410, heart-shaped gear 420, first rotating portion 421, first tooth portion 422, sensor 430, incomplete gear 500, second rotating portion 510, arc-shaped protrusion 511, cylindrical protrusion 512, groove 513, second tooth portion 520, operating handle 600, third rotating portion 610, rotating through hole 611, handle portion 620, micro travel switch 700, trip assembly 800, trip lever 810, swing portion 811, first swing arm 812, feeler 814, second swing arm 813, trip lever 820, tripping electromagnet 900;

[0052] Control module 10, power module 20, first DC power supply unit 21, second DC power supply unit 22, communication module 30, signal transmission branch 31, filter branch 32, signal receiving branch 33, position acquisition module 40, motor drive module 50, load end voltage detection module 60, line temperature detection module 70 DETAILED DESCRIPTION

[0053] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0054] In the description of the present invention, it should be understood that, with respect to descriptions of orientation, the orientations or positional relationships indicated by terms such as “center, longitudinal, transverse, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, circumferential, radial, and axial” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0056] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "set," "arranged," etc. should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0057] First reference Figures 1 to 10 The circuit breaker transmission mechanism in this application is described.

[0058] like Figures 1 to 3 As shown, the circuit breaker transmission mechanism of the embodiment of the present invention includes a controllable motor 200, a worm 300, a turbine 400, a cam 410, a heart-shaped gear 420, a sensor 430, an incomplete gear 500, an operating handle 600 and a micro travel switch 700.

[0059] The output shaft of the controllable motor 200 is connected to one end of the worm 300 along its length, while the other end of the worm 300 is rotatably connected to the support 110. The worm gear 400 is positioned above the worm 300 and meshes with the worm 300 for transmission. The cam 410, heart-shaped gear 420, and sensor 430 are all coaxially arranged with the worm gear 400, with the worm 400 located between the cam 410 and the heart-shaped gear 420. The sensor 430 is located on the side of the cam 410 away from the worm gear 400. The sensor 430 is used to detect the rotation angle of the worm gear 400. The incomplete gear 500 is positioned above the heart-shaped gear 420. When the heart-shaped gear 420 rotates with the worm gear 400 to a certain position, it meshes with the incomplete gear 500. The operating handle 600 is coaxially arranged with the incomplete gear 500 and rotates with it. The micro-travel switch 700 is used to detect the open and closed status of the circuit breaker.

[0060] Specifically, if Figure 4 As shown, the turbine 400 and the cam 410 are integrally formed to ensure that the turbine 400 and the cam 410 can rotate synchronously.

[0061] Specifically, if Figure 5 and Figure 6As shown, the heart-shaped gear 420 includes a first rotating portion 421 and a first tooth portion 422; the first rotating portion 421 is a disc structure, the first rotating portion 421 and the first tooth portion 422 have the same thickness, and the first tooth portion 422 is arranged on a partial circumferential side wall of the first rotating portion 421; the heart-shaped gear 420 is coaxially connected to the turbine 400 through the first rotating portion 421; when the first rotating portion 421 rotates a certain angle under the action of the turbine 400, the first tooth portion 422 will engage with the incomplete gear 500 to drive the incomplete gear 500 to rotate.

[0062] Specifically, if Figure 7 and Figure 8 As shown, the incomplete gear 500 includes a second rotating portion 510 and a second tooth portion 520; the second rotating portion 510 is a cylindrical structure, and the second tooth portion 520 is arranged on a partial circumferential side wall of the second rotating portion 510 at one end away from the turbine 400; when the first rotating portion 421 rotates a certain angle under the action of the turbine 400, the first tooth portion 422 engages with the second tooth portion 520 to drive the incomplete gear 500 to rotate.

[0063] An arc-shaped protrusion 511 extends axially from one end of the second rotating portion 510 close to the turbine 400; during the rotation of the incomplete gear 500, the outer wall of the arc-shaped protrusion 511 contacts or separates from the contacts of the micro-stroke switch 700 to switch the micro-stroke switch 700 to a closed or open state.

[0064] A cylindrical protrusion 512 is formed at one end of the second rotating portion 510 away from the turbine 400 and extends along the axial direction thereof; a groove 513 is formed in the middle of the cylindrical protrusion 512 .

[0065] Specifically, if Figure 9 As shown, the operating handle 600 includes a third rotating portion 610 and a handle portion 620. The handle portion 620 is provided on the axial side of the rotating portion 610. The third rotating portion 610 is coaxially arranged with the incomplete gear 500. A rotating through hole 611 is provided in the middle of the third rotating portion 610.

[0066] Specifically, one end of the connecting shaft between the incomplete gear 500 and the operating handle 600 can be configured according to the cross-sectional shape of the groove 513, and the other end of the connecting shaft can be configured according to the shape of the rotating through hole 611. One end of the connecting shaft is inserted into the groove 513, and the other end is inserted into the rotating through hole 611. While achieving the coaxial arrangement of the incomplete gear 500 and the operating handle 600, it is also possible to achieve stable synchronous rotation of the incomplete gear 500 and the operating handle 600. It should be noted that the cross-sectional shape of the groove 513 and the shape of the rotating through hole 611 are not specifically limited in this application and can be triangular, square, diamond, etc. The cross-sectional shape of the groove 513 and the shape of the rotating through hole 611 can be the same or different.

[0067] Specifically, if Figures 1 to 3 As shown, the transmission mechanism further includes a tripping assembly 800 , which is disposed on one side of the cam 410 and is used to control the movement of the operating handle 600 under the action of the cam 410 .

[0068] Specifically, the trip assembly 800 includes a trip lever 810 and a trip lever 820. Figure 10 As shown, the trip lever 810 includes a swing portion 811, a first swing arm 812, and a second swing arm 813. The swing portion 811, the first swing arm 812, and the second swing arm 813 are integrally formed. The first swing arm 812 and the second swing arm 813 are disposed around the swing portion 811, with the first swing arm 812 disposed on the axial side of the swing portion 811 near the cam 410. The lower end surface of the first swing arm 812 contacts the trip lever 820. The first swing arm 812 has a feeler 814 extending toward the side of the cam 410. When the cam 410 rotates a certain angle, the edge of the cam 410 presses the feeler 814, causing the first swing arm 812 to swing. The swinging of the first swing arm 812 presses the trip lever 820, causing it to move.

[0069] The second swing arm 813 is arranged on the axial side of the swing portion 811 away from the cam 410; the tripping electromagnet 900 is arranged below the second swing arm 813, and the push rod of the tripping electromagnet 900 moves upward and contacts the lower end surface of the second swing arm 813.

[0070] Reference below Figures 11 to 19 A control device for a circuit breaker transmission mechanism according to an embodiment of the first aspect of the present invention will be described.

[0071] like Figure 11 As shown, the control device according to an embodiment of the present invention includes a control module 10, a power supply module 20, a communication module 30, a position acquisition module 40, a motor drive module 50, a load-end voltage detection module 60 and a line temperature detection module 70; the power supply module 20 is connected to the control module 10, the communication module 30, the position acquisition module 40, the motor drive module 50, the load-end voltage detection module 60 and the line temperature detection module 70 to supply power; the communication module 30, the position acquisition module 40, the motor drive module 50, the load-end voltage detection module 60 and the line temperature detection module 70 are all connected to the control module 10 for signal transmission.

[0072] in,

[0073] The communication module 30 is used to establish a communication connection between the control module 10 and the remote control terminal so that the control module 10 can receive the opening and closing commands of the circuit breaker issued by the remote control terminal;

[0074] The position acquisition module 40 is used to detect the operating state of the transmission mechanism under the action of the control module 10 and send the operating state to the control module 10;

[0075] The motor drive module 50 is used to drive the motor of the transmission mechanism to rotate or stop under the action of the control module 10;

[0076] The control module 10 is also used to run the PID algorithm according to the operating state of the transmission mechanism and adjust the speed and torque of the motor of the transmission mechanism through the motor drive module 50;

[0077] The load terminal voltage detection module 60 is used to detect the voltage of the load terminal when the circuit breaker is in the closed position and the open position under the action of the control module 10 to determine whether the motor of the transmission mechanism has rotated to the preset position;

[0078] The line temperature detection module 70 is used to detect the line temperature under the action of the control module 10 to prevent the line from being overheated due to abnormalities. When the line temperature exceeds a predetermined value, the control module 10 controls the motor drive module 50 to drive the motor of the transmission mechanism to rotate to open the circuit breaker, thereby protecting the line.

[0079] In combination with the above-mentioned circuit breaker transmission mechanism, specifically, the controllable motor 200 is electrically connected to the motor drive module 50 so that the motor drive module 50 drives the controllable motor 200 to rotate or stop under the control of the control module 10; the position acquisition module 40 includes a sensor 430 and a micro-travel switch 700, and the sensor 430 is electrically connected to the control module 10 so that the control module 10 detects the rotation angle of the sensor 430; the micro-travel switch 700 is electrically connected to the control module 10 so that the control module 10 detects the working status of the micro-travel switch 700.

[0080] The control module 10 remotely receives the closing command or opening command of the circuit breaker, and controls the motor drive module 50 to drive the controllable motor 200 to rotate according to the closing command or opening command; and adjusts the speed of the controllable motor 200 through the motor drive module 50 according to the working state of the micro limit switch 700 and the rotation angle of the sensor 430.

[0081] In the present application, a controllable motor 200 is used as a power source, and a worm 300, a turbine 400, a cam 410, a heart-shaped gear 420, an incomplete gear 500 and an operating handle 600 are combined to realize transmission and complete the opening and closing action of the circuit breaker; the transmission mechanism is simple and the various components are compactly arranged, which is conducive to reducing the occupied space of the transmission mechanism while ensuring the reliable operation of the transmission mechanism. The control module 10, the sensor 430 and the micro-travel switch 700 are used for multiple detection and control, so that the position and time when the controllable motor 200 stops rotating are more accurate, thereby making the opening and closing position and opening and closing time of the circuit breaker more accurate, which is conducive to improving safety. The controllable motor 200 has the characteristics of modular gear set, controllable rotation angle, large torque, small size, stable start and stop, stable operation and low cost. As a power source, the controllable motor 200 can effectively solve the problems of overshoot and jamming of the transmission mechanism caused by the existing circuit breaker using a DC motor as a power source.

[0082] The above control device is used to remotely control the automatic opening and closing of the circuit breaker. The entire working process is as follows:

[0083] a) Remote automatic closing

[0084] When the circuit breaker is in the open state, the operating handle 600 is in the open position; at this time, a closing command can be sent to the control module 10 through the remote control terminal software operation (such as a computer or mobile phone APP, etc.); after receiving the closing command, the control module 10 drives the controllable motor 200 to rotate forward through the motor drive module 50, and the controllable motor 200 drives the turbine 400 and the heart-shaped gear 420 coaxial with the turbine 400 to rotate together through the worm 300; when the heart-shaped gear 420 rotates to a certain position, the first tooth portion 422 on the heart-shaped gear 420 will mesh with the second tooth portion 520 on the incomplete gear 500 to drive the incomplete gear 500 to rotate; at the same time, the operating The operating handle 600 also rotates to the closing position following the incomplete gear 500; when the operating handle 600 is in the closing position, the arc-shaped protrusion 511 on the incomplete gear 500 touches the contact of the micro-stroke switch 700 and changes it from the open state to the closed state; the control module 10 drives the controllable motor 200 to stop rotating through the motor drive module 50 based on the detected state change of the micro-stroke switch 700; at the same time, the heart-shaped gear 420 reaches the tripping waiting position; the arc-shaped protrusion 511 on the incomplete gear 500 separates from the contact of the micro-stroke switch 700, and the contact of the micro-stroke switch 700 is reset to the open state; in this way, a process from opening to closing is completed.

[0085] b) Remote automatic tripping

[0086] When the circuit breaker is in the closed state, the operating handle 600 is in the closed position; at this time, an opening command can be sent to the control module 10 through remote control terminal software operation (such as a computer or mobile phone APP, etc.); after receiving the opening command, the control module 10 drives the controllable motor 200 to rotate forward through the motor drive module 50, and the controllable motor 200 drives the turbine 400 and the cam 410 coaxial with the turbine 400 to rotate together through the worm 300; during the rotation process, the cam 410 will touch the feeler 814 on the trip lever 810 to swing the first swing arm 812; the swing of the first swing arm 812 causes the trip lever 820 to move, and the movement of the trip lever 820 causes the spring inside the circuit breaker to deform; the deformation of the spring causes the operating handle 600 to become unbalanced, and the operating handle 600 will be bounced back to the opening position. During this process, the incomplete gear 500 rotates from the closed position to the open position; the arc-shaped protrusion 511 on the incomplete gear 500 will disengage from the contact of the micro-stroke switch 700 and change it from the closed state to the open state; the controllable motor 200 continues to rotate to the closing waiting position; the control module 10 drives the controllable motor 200 to stop rotating through the motor drive module 50 based on the detected state change of the micro-stroke switch 700 and the sensor 430 following the turbine 400 to rotate to the set value; in this way, a process from closing to opening is completed.

[0087] like Figure 12 As shown, in some specific embodiments of the present invention, the control module 10 includes a control chip U1 and its peripheral circuits. In this application, the control chip U1 adopts a single-chip microcomputer model Hi321910. The control chip U1 receives the circuit breaker opening and closing commands issued by the remote control terminal through the communication module 30.

[0088] like Figure 13 and Figure 14 As shown, in some specific embodiments of the present invention, the power supply module 20 includes an AC power supply, a transformer T, a first DC power supply unit 21, and a second DC power supply unit 22. The primary winding of the transformer T is connected to the AC power supply. Specifically, one terminal (the first pin in the figure) of the primary winding of the transformer T is connected to the neutral line N of the AC power supply, and the other terminal (the fourth pin in the figure) is connected to the live line L of the AC power supply via an eleventh capacitor C11. The secondary winding of the transformer T is connected to the communication module 30 to transform the output voltage of the AC power supply and transmit it to the communication module 30 for power supply. The input terminal of the first DC power supply unit 21 is connected to the AC power supply to convert the AC power into a first DC voltage P5V for output. The input terminal of the second DC power supply unit 22 is connected to the output terminal of the first DC power supply unit 21 to convert the first DC voltage P5V into a second DC voltage +3V3 for output.

[0089] Furthermore, the first DC power supply unit 21 includes an isolated power chip M, an NTC thermistor, an MOV varistor, a fuse F, a first polarity capacitor E1, a second polarity capacitor E2, a forty-sixth capacitor C46, ​​a forty-fifth capacitor C45 and a forty-eighth capacitor C48.

[0090] Specifically, the isolated power supply chip M adopts an AC-DC step-down chip with model PTSJ5W; the VL pin of the isolated power supply chip M is connected to the live wire L of the AC power supply through an NTC thermistor, and the UN pin of the isolated power supply chip M is connected to the neutral wire N of the AC power supply through a fuse F. The VL pin and the UN pin of the isolated power supply chip M are connected through an MOV varistor; the V0 pin and the GND pin of the isolated power supply chip M are connected through a parallel branch composed of a first polarity capacitor E1, a second polarity capacitor E2, a forty-sixth capacitor C46, ​​a forty-fifth capacitor C45 and a forty-eighth capacitor C48; the GND pin of the isolated power supply chip M is grounded; the VO pin of the isolated power supply chip M serves as the output end of the first DC power supply unit 21 to output the first DC voltage P5V.

[0091] Furthermore, the second DC power supply unit 22 includes a step-down power supply chip U6, a thirty-fourth resistor R34, a thirty-seventh resistor R37, a thirty-second resistor R32, a forty-first capacitor C41, a sixth inductor L6, a thirty-fifth resistor R35, a thirty-eighth resistor R38, a forty-third capacitor C43 and a forty-fourth capacitor C44.

[0092] Specifically, the step-down power supply chip U6 adopts a DC-DC step-down chip with model ETA2845S2G; the VIN pin and EN pin of the step-down power supply chip U6 are connected through the thirty-fourth resistor R34, and the EN pin is grounded through the thirty-seventh resistor R37; the GND pin of the step-down power supply chip U6 is grounded; the FB pin of the step-down power supply chip U6 is grounded through the thirty-eighth resistor R38; the BST pin and SW pin of the step-down power supply chip U6 are connected in series through the thirty-second resistor R32 and the forty-first capacitor C41; the SW pin of the step-down power supply chip U6 is connected in series to the FB pin through the sixth inductor L6 and the thirty-fifth resistor R35; the node between the sixth inductor L6 and the thirty-fifth resistor R35 serves as the output end of the second DC power supply unit 22 to output the second DC voltage +3V3, and the node between the sixth inductor L6 and the thirty-fifth resistor R35 is grounded through a parallel branch composed of the forty-third capacitor C43 and the forty-fourth capacitor C44.

[0093] like Figure 14 As shown, in some specific embodiments of the present invention, the communication module 30 includes a bidirectional breakdown diode VD, a signal transmitting branch 31 , a filtering branch 32 and a signal receiving branch 33 .

[0094] The bidirectional breakdown diode VD, the signal transmitting branch 31 and the filtering branch 32 are connected to the secondary winding of the transformer T, and the signal receiving branch 33 is connected to the filtering branch 32 .

[0095] Specifically, a bidirectional breakdown diode (VD) is connected in parallel with the secondary winding of transformer T. A bidirectional breakdown diode (VD) is an overvoltage protection device with bidirectional voltage regulation and bidirectional negative resistance characteristics, similar to a varistor. It is used in various AC and DC power supply circuits to suppress transient overvoltages. When a surge voltage momentarily appears in the protected circuit, the bidirectional breakdown diode rapidly undergoes Zener breakdown, changing from a high-resistance state to a low-resistance state, shunting and clamping the surge voltage, thereby protecting the various components in the circuit from damage caused by the transient surge voltage.

[0096] Furthermore, the signal transmission branch 31 includes a tenth capacitor C10, a third resistor R3, a first Schottky diode D1, a second Schottky diode D2, a fourteenth capacitor C14, a fourth resistor R4 and a ninth capacitor C9.

[0097] Specifically, one terminal of the secondary winding of the transformer T (pin 8 in the figure) is connected in series to the control module 10 via a tenth capacitor C10 and a third resistor R3, specifically connected to a transmit pin TX_N of the control module 10. The other terminal of the secondary winding of the transformer T (pin 5 in the figure) is connected in series to the control module 10 via a fourteenth capacitor C14 and a fourth resistor R4, specifically connected to another transmit pin TX_P of the control module 10.

[0098] One end of the parallel branch composed of the first Schottky diode D1 and the second Schottky diode D2 is connected to the node between the tenth capacitor C10 and the third resistor R3, and the other end is connected to the node between the fourteenth capacitor C14 and the fourth resistor R4. Specifically, the anode of the first Schottky diode D1 is connected to the anode of the second Schottky diode D2, the cathode of the first Schottky diode D1 is connected to the cathode of the second Schottky diode D2, and the cathode and anode of the first Schottky diode D1 are grounded through the ninth capacitor C9. The cathode of the first Schottky diode D1 is connected to the control module 10, specifically the TX drive power pin D3V3_LD connected to the control module 10. The common pole of the first Schottky diode D1 is connected to the node between the tenth capacitor C10 and the third resistor R3, and the common pole of the second Schottky diode D2 is connected to the node between the fourteenth capacitor C14 and the fourth resistor R4. In the present application, the first Schottky diode D1 and the second Schottky diode D2 are connected in parallel in the same direction to increase the current passing through the circuit.

[0099] Furthermore, the filtering branch 32 includes a first resistor R1, a second resistor R2, a fifty-sixth resistor R56, a fifth resistor R5, two groups of LC branches, a sixty-ninth capacitor C69, a second capacitor C2, a seventh capacitor C7, a first inductor L1 and a second inductor L2.

[0100] Specifically, one terminal (pin 8 as shown in the figure) of the secondary winding of the transformer T is connected to ground in series through the first resistor R1 and the second resistor R2, and the other terminal (pin 5 as shown in the figure) is connected to ground in series through the fifty-sixth resistor and the fifth resistor.

[0101] The two groups of LC branches specifically include a first group of LC branches consisting of a sixty-seventh capacitor C67, a fourth inductor L4 and a sixty-eighth capacitor C68 connected in series, and a second group of LC branches consisting of a sixty-fifth capacitor C65, a fifth inductor L5 and a sixty-sixth capacitor C66 connected in series; one end of the sixty-seventh capacitor C67 is connected to a node between the first resistor R1 and the second resistor R2, and the other end is connected to one end of the sixty-fifth capacitor C65; one end of the sixty-eighth capacitor C68 is connected to a node between the fifty-sixth resistor and the fifth resistor, and the other end is connected to one end of the sixty-sixth capacitor C66.

[0102] The sixty-ninth capacitor C69, the second capacitor C2 and the seventh capacitor C7 are connected in series, and one end of the sixty-ninth capacitor C69 is connected to the other end of the sixty-fifth capacitor C65, and one end of the seventh capacitor C7 is connected to the other end of the sixty-sixth capacitor C66.

[0103] One end of the first inductor L1 is connected to the other end of the sixty-ninth capacitor C69 , one end of the second inductor L2 is connected to the other end of the seventh capacitor C7 , and the other ends of the first inductor L1 and the second inductor L2 are both connected to the signal receiving branch 33 .

[0104] Furthermore, the signal receiving branch 33 includes a first capacitor C1, a fifty-fifth resistor R55, a third Schottky diode D3, a fourth Schottky diode D4, a third capacitor C3, a fourth capacitor C4 and a sixth capacitor C6.

[0105] Specifically, the first capacitor C1 is connected to the filter branch 32. Specifically, one end of the first capacitor C1 is connected to the other end of the first inductor L1, and is connected to the control module 10 via the fourth capacitor C4, specifically to a receiving pin RX_N of the control module 10. The other end of the first capacitor C1 is connected to the other end of the second inductor L2, and is connected to the control module 10 via the third capacitor C3, specifically to another receiving pin RX_P of the control module 10. A fifty-fifth resistor R55 is connected in parallel with the first capacitor C1.

[0106] The parallel branch composed of the third Schottky diode D3 and the fourth Schottky diode D4 is connected in parallel with the first capacitor C1. Specifically, the anode of the third Schottky diode D3 is connected to the anode of the fourth Schottky diode D4 and is grounded; the cathode of the third Schottky diode D3 is connected to the cathode of the fourth Schottky diode D4 and is grounded through the sixth capacitor C6; meanwhile, the cathode of the third Schottky diode D3 is connected to the control module 10, specifically the AFE3V3 pin (chip internal AFE circuit 3.3V external decoupling capacitor pin) of the control module 10. The common pole of the third Schottky diode D3 is connected to one end of the first capacitor C1, and the common pole of the fourth Schottky diode D4 is connected to the other end of the first capacitor C1. In the present application, the third Schottky diode D3 and the fourth Schottky diode D4 are connected in parallel in the same direction to increase the current passing through the circuit.

[0107] like Figure 15 As shown, in some specific embodiments of the present invention, the position acquisition module 40 includes a micro-stroke switch SW, a seventh resistor R7, a seventeenth capacitor C17, and a sensor TR. It should be noted that the micro-stroke switch SW is the micro-stroke switch 700, and the sensor TR is the sensor 430. The sensor TR is a potentiometer sensor.

[0108] Specifically, the first pin and the fourth pin of the micro-limit switch SW are grounded, the second pin and the third pin are connected to the ground through the seventeenth capacitor C17, and the second pin and the third pin are connected to the second DC voltage +3V3 through the seventh resistor R7; at the same time, the second pin and the third pin are connected to the control module 10, specifically the PAO pin of the control module 10, and the control module 10 detects the state change of the micro-limit switch SW through the PAO pin to determine whether the circuit breaker is successfully closed or opened; the first pin of the sensor TR is connected to the second DC voltage +3V3, the second pin is grounded, and the third pin is connected to the control module 10, specifically the ADC2 pin of the control module 10; the sensor TR is rotated to change the voltage value of the ADC2 pin of the input control module 10.

[0109] like Figure 16As shown, in some specific embodiments of the present invention, the motor drive module 50 includes a driver chip U5, a twenty-fifth resistor R25, and a seventy-seventh capacitor C77. Specifically, the model of the driver chip U5 is SA8301P; the NC pin and the INA pin of the driver chip U5 are left floating; the INB pin of the driver chip U5 is connected to the control module 10 through the twenty-fifth resistor R25, specifically to the PWM pin of the control module 10; the VDD pin of the driver chip U5 is connected to the first DC voltage P5V and is grounded through the seventy-seventh capacitor C77; the PGND pin and the AGND pin of the driver chip U5 are grounded; the OUTB pin of the driver chip U5 is connected to the negative electrode of the controllable motor 200, and the OUTA pin is connected to the positive electrode of the controllable motor 200.

[0110] like Figure 17 As shown, in some specific embodiments of the present invention, the load-end voltage detection module 60 includes an optocoupler U2, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, and a twenty-eighth capacitor C28. Specifically, the collector of the optocoupler U2 is connected to the control module 10, specifically to the PA1 pin of the control module 10; at the same time, the collector of the optocoupler U2 is connected to the second DC voltage +3V3 through the thirteenth resistor R13, and the thirteenth resistor R13 and the twenty-eighth capacitor C28 are connected in series to ground; the emitter of the optocoupler U2 is grounded; the anode of the optocoupler U2 is connected in series to a terminal UL_OUT of the load end through the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17, and the eighteenth resistor R18; and the cathode of the optocoupler U2 is connected to the other terminal UN_OUT of the load end.

[0111] When the circuit breaker is in the closed state, there is a 220V voltage between the two terminals UL_OUT and UN_OUT at the load end, and the optocoupler U2 is turned on; when the circuit breaker is in the open state, there is no 220V voltage between the two terminals UL_OUT and UN_OUT at the load end, and the optocoupler U2 is not turned on; the control module 10 detects the conductive and non-conductive states of the optocoupler U2 through the PA1 pin, and then determines the open and closed states of the circuit breaker.

[0112] like Figure 18As shown, in some specific embodiments of the present invention, the circuit temperature detection module 70 includes a nineteenth resistor R19, a twentieth resistor R20, a twenty-ninth capacitor C29, a twenty-first resistor R21, a twenty-second resistor R22, and a thirty-second capacitor C32. Specifically, one end of the nineteenth resistor R19 is connected to the control module 10, specifically to the ADCO pin of the control module 10; the other end of the nineteenth resistor R19 is connected to the second DC voltage +3V3 through the twentieth resistor R20 and to ground through the twenty-ninth capacitor C29; at the same time, the other end of the nineteenth resistor R19 is connected to NTC_N (the temperature detection pin of the neutral line N). One end of the twenty-first resistor R21 is connected to the control module 10, specifically to the ADC1 pin of the control module 10; the other end of the twenty-first resistor R21 is connected to the second DC voltage +3V3 through the twenty-second resistor R22, and is grounded through the thirty-second capacitor C32; at the same time, the other end of the twenty-first resistor R21 is connected to NTC_L (the temperature detection pin of the live wire L); the control module 10 detects the temperature of the neutral wire N through the ADCO pin, and the control module 10 detects the temperature of the live wire L through the ADC1 pin.

[0113] According to the control method of the circuit breaker transmission mechanism of the second embodiment of the present invention, it is applied to the control device of the above-mentioned first embodiment, which includes a control module 10, a power supply module 20, a communication module 30, a position acquisition module 40 and a motor drive module 50; the power supply module 20 is connected to the control module 10, the communication module 30, the position acquisition module 40, and the motor drive module 50 to supply power; the communication module 30, the position acquisition module 40 and the motor drive module 50 are all connected to the control module 10; the position acquisition module 40 includes a sensor TR and a micro-travel switch SW; the sensor TR is a potentiometer-type sensor, and the voltage value of the ADC2 pin of the input control module 10 is changed by rotating the sensor TR.

[0114] The control method comprises the following steps:

[0115] A target position is pre-set for the sensor to follow the rotation of the motor of the transmission mechanism; the target position corresponds to the closing position or the opening position of the circuit breaker; and the voltage value of the ADC2 pin of the control module corresponding to the target position is used as the reference voltage value;

[0116] The control module receives the closing or opening command from the remote control terminal through the communication module;

[0117] The control module controls the motor drive module to drive the motor to rotate, and the voltage value of the ADC2 pin of the control module corresponding to the current position of the sensor is used as the current voltage value;

[0118] Determine whether the difference between the current voltage value and the reference voltage value is zero;

[0119] If the difference between the current voltage value and the reference voltage value is not zero, the sensor has not rotated to the target position. The control module runs the PID algorithm based on the difference to adjust the duty cycle of the PWM waveform output by the control module, and adjusts the speed of the motor through the motor drive module;

[0120] If the difference between the current voltage value and the reference voltage value is zero, the sensor rotates to the target position, and the control module controls the motor drive module to drive the motor to stop rotating;

[0121] After the motor stops rotating, the control module determines whether the motor has reached the target position based on the state change of the micro travel switch and the voltage at the load end.

[0122] In the present application, the sensor TR adopts a potentiometer-type sensor. When the entire system loses power, the sensor TR will still maintain the state before the power failure. After the power is restored, the system can return to the initial state without switching action. However, for the potentiometer-type sensor, due to the particularity of its own structure, it is not a complete circle. Therefore, during the rotation of the controllable motor, the potentiometer value corresponding to a certain angle is empty. For sensors with non-closed-loop position information, in the continuous segment, as the controllable motor rotates, the position information increases linearly and continuously. When from the continuous segment to the window period, the position information remains unchanged. When from the window period to the continuous segment, the position information suddenly changes from the maximum value to 0, and then increases linearly. The system integrates the three regular segments of position information into a complete change segment to realize the position detection of the entire closed loop.

[0123] like Figure 19 As shown in the figure, when the circuit breaker is in the open state, the potentiometer runs from the opening completion point to the closing waiting point, awaiting the next closing command. When the circuit breaker receives the closing command, the controllable motor begins to rotate. The system determines that the current state is switching from the open to the closed state, passing the potentiometer's no-signal boundary. The PID algorithm is then applied to ensure that the controllable motor continues to rotate until the potentiometer sampled voltage value is detected again, thus crossing the "blind zone." After the potentiometer returns to the signal boundary, the PID algorithm continues to adjust the controllable motor so that the potentiometer passes the closing completion point and reaches the opening waiting point, completing the process from opening to closing. This method can be used for potentiometers with non-closed-loop position information; other types of position sensors can be used directly.

[0124] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A control device for a circuit breaker transmission mechanism, characterized in that: It includes a control module, a power supply module, a communication module, a position acquisition module, a motor drive module and a load-end voltage detection module; the power supply module is connected to the control module, the communication module, the position acquisition module, the motor drive module and the load-end voltage detection module to supply power; the communication module, the position acquisition module, the motor drive module and the load-end voltage detection module are all connected to the control module; The communication module is used to establish a communication connection between the control module and the remote control terminal, so that the control module can receive the opening and closing commands of the circuit breaker issued by the remote control terminal; The position acquisition module is used to detect the operating status of the transmission mechanism under the action of the control module and send the operating status of the transmission mechanism to the control module; The motor driving module is used to drive the motor of the transmission mechanism to rotate or stop under the action of the control module; The load terminal voltage detection module is used to detect the voltage of the load terminal under the action of the control module; The control module is further configured to run a PID algorithm according to the operating state of the transmission mechanism and adjust the speed and torque of the motor of the transmission mechanism through the motor drive module; In which, the power supply module also includes a first DC power supply unit; the motor drive module includes a drive chip U5, a twenty-fifth resistor R25 and a seventy-seventh capacitor C77; the NC pin and INA pin of the drive chip U5 are suspended; the INB pin of the drive chip U5 is connected to the PWM pin of the control module through the twenty-fifth resistor R25; the VDD pin of the drive chip U5 is connected to the output end of the first DC power supply unit and is grounded through the seventy-seventh capacitor C77; the PGND pin and AGND pin of the drive chip U5 are grounded; the OUTB pin of the drive chip U5 is connected to the negative pole of the motor of the transmission mechanism, and the OUTA pin is connected to the positive pole of the motor of the transmission mechanism.

2. The control device according to claim 1, characterized in that The power supply module includes an AC power supply and a transformer T, and the AC power supply is connected to the primary winding of the transformer T; the communication module includes a bidirectional breakdown diode VD, a signal transmitting branch, a filtering branch, and a signal receiving branch; the bidirectional breakdown diode VD, the signal transmitting branch, and the filtering branch are connected to the secondary winding of the transformer T, and the signal receiving branch is connected to the filtering branch.

3. The control device according to claim 2, characterized in that The signal transmission branch includes a tenth capacitor C10, a third resistor R3, a first Schottky diode D1, a second Schottky diode D2, a fourteenth capacitor C14 and a fourth resistor R4; One terminal of the secondary winding of the transformer T is connected in series to a transmitting pin TX_N of the control module via the tenth capacitor C10 and the third resistor R3; the other terminal of the secondary winding of the transformer T is connected in series to another transmitting pin TX_P of the control module via the fourteenth capacitor C14 and the fourth resistor R4; one end of the parallel branch formed by the first Schottky diode D1 and the second Schottky diode D2 is connected to the node between the tenth capacitor C10 and the third resistor R3, and the other end is connected to the node between the fourteenth capacitor C14 and the fourth resistor R4.

4. The control device according to claim 2, characterized in that The signal receiving branch includes a first capacitor C1, a fifty-fifth resistor R55, a third Schottky diode D3, a fourth Schottky diode D4, a third capacitor C3 and a fourth capacitor C4; The first capacitor C1 is connected to the filter branch, and one end of the first capacitor C1 is connected to a receiving pin RX_N of the control module through the fourth capacitor C4; the other end of the first capacitor C1 is connected to another receiving pin RX_P of the control module through the third capacitor C3; the fifty-fifth resistor R55 is connected in parallel with the first capacitor C1; the parallel branch composed of the third Schottky diode D3 and the fourth Schottky diode D4 is connected in parallel with the first capacitor C1.

5. The control device according to claim 1, characterized in that The power supply module also includes a second DC power supply unit; the position acquisition module includes a micro-stroke switch SW, a seventh resistor R7 and a seventeenth capacitor C17; the first pin and the fourth pin of the micro-stroke switch SW are grounded, the second pin and the third pin are connected to the ground through the seventeenth capacitor C17, and the second pin and the third pin are connected to the output end of the second DC power supply unit through the seventh resistor R7; the second pin and the third pin are connected to the PA0 pin of the control module.

6. The control device according to claim 5, characterized in that The position acquisition module further includes a sensor TR, which is a potentiometer sensor; a first pin of the sensor TR is connected to the output end of the second DC power supply unit, a second pin is grounded, and a third pin is connected to the ADC2 pin of the control module.

7. The control device according to claim 1, characterized in that It also includes a circuit temperature detection module, which is connected to the control module and is used to detect the temperature of the circuit under the action of the control module.

8. A method for controlling a circuit breaker transmission mechanism, characterized in that: A control device applied to any one of claims 1 to 7, the control device comprising a control module, a power module, a communication module, a position acquisition module, a motor drive module, and a load-end voltage detection module; the power module is connected to the control module, the communication module, the position acquisition module, the motor drive module, and the load-end voltage detection module to supply power; the communication module, the position acquisition module, the motor drive module, and the load-end voltage detection module are all connected to the control module; the position acquisition module comprises a sensor and a micro-travel switch; the sensor is a potentiometer-type sensor; and the control method comprises the following steps: Presetting a target position for the sensor to follow the rotation of the motor of the transmission mechanism; the target position corresponds to the closing position or the opening position of the circuit breaker; and using the voltage value of the ADC2 pin of the control module corresponding to the target position as a reference voltage value; The control module receives a closing or opening command from a remote control terminal through the communication module; The control module controls the motor driving module to drive the motor to rotate, and uses the voltage value of the ADC2 pin of the control module corresponding to the current position of the sensor as the current voltage value; Determining whether a difference between the current voltage value and the reference voltage value is zero; If the difference between the current voltage value and the reference voltage value is not zero, the sensor has not rotated to the target position, and the control module runs a PID algorithm according to the difference to adjust the duty cycle of the PWM waveform output by the control module, and adjusts the speed of the motor through the motor drive module; If the difference between the current voltage value and the reference voltage value is zero, the sensor rotates to the target position, and the control module controls the motor driving module to drive the motor to stop rotating; After the motor stops rotating, the control module determines whether the motor rotates to reach the target position according to the state change of the micro travel switch and the voltage at the load end.

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