Band-type brake control circuit and electronic equipment

Abstract

The utility model discloses a band-type brake control circuit and electronic equipment, and belongs to the technical field of motor control. An isolation power supply isolates and converts input direct current so as to output power supply direct current; the isolation circuit isolates the first control signal based on the power supply direct current so as to output a second control signal; the switching tube stops transmitting the working voltage to the band-type brake coil based on the second control signal, the working voltage is transmitted to the band-type brake coil through the switching tube or stops transmitting the working voltage to the band-type brake coil, the circuit cost is reduced, and the switching tube is high in reliability and not prone to damage; the isolation of the input direct current and the power supply direct current is realized through the isolation power supply, and the isolation of the first control signal and the second control signal is realized through the isolation circuit, so that the possibility that the circuit is damaged by the working voltage when a switch tube is used in a high-voltage environment and a fault occurs is reduced, and the safety of the circuit is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of motor control, and in particular, relates to a brake control circuit and electronic equipment. Background Art

[0002] Motor brake is a common motor control technology, which can quickly stop the motor by controlling the current of the motor. In industrial production, motor brake technology is widely used in the control systems of various equipment and machinery. Its principle is simple and effective. The motor brake of the feed door and discharge door in the lifting industry is controlled by DC strong current. The motor is powered on to release the brake, and the motor is powered off to brake.

[0003] In traditional high-voltage environments, DC strong-current control brake circuits use high-voltage DC relays or contactors as switches to enable or disable power to the motor. High-voltage DC relays or contactors are expensive and use mechanical contacts that are easily damaged and spark, making them less safe.

[0004] Therefore, there is an urgent need for a brake control circuit that is low in cost, not prone to damage, and highly safe. Utility Model Content

[0005] The purpose of the present application is to provide a brake control circuit and electronic equipment, aiming to solve the problems of high cost, easy damage and low safety of existing DC high-voltage control brake circuits.

[0006] The embodiment of the present application provides a brake control circuit, including a high-voltage rectifier circuit and a brake coil. When the motor is working, the high-voltage rectifier circuit is used to rectify the high-voltage alternating current and output a working voltage to supply power to the brake coil; the brake control circuit includes:

[0007] An isolated power supply, configured to receive input direct current, isolate and convert the input direct current, and output power supply direct current;

[0008] an isolation circuit, connected to the isolation power supply, configured to receive a first control signal and isolate the first control signal based on the power supply DC power to output a second control signal;

[0009] A switch tube is connected to the isolation circuit, the high-voltage rectification circuit and the brake coil, and is configured to stop transmitting the working voltage to the brake coil based on the second control signal.

[0010] In one embodiment, the isolated power supply comprises:

[0011] a multivibrator module, configured to be connected to the input direct current, and to perform self-excited multivibrator oscillation based on the input direct current to output a first alternating current;

[0012] an isolation conversion module, connected to the multivibrator module, and configured to isolate and convert the first alternating current to output a second alternating current;

[0013] A rectifier module is connected to the isolation conversion module and the isolation circuit, and is configured to rectify the second alternating current to output the power supply direct current.

[0014] In one embodiment, the multivibrator module comprises:

[0015] an oscillation unit configured to output a first oscillation signal;

[0016] an inverting unit, connected to the oscillating unit, and configured to invert the first oscillating signal to output a second oscillating signal;

[0017] a first switch unit, connected to the oscillation unit, the inverting unit and the isolation conversion module, and configured to output a positive half cycle of the first alternating current according to the first oscillation signal;

[0018] a second switch unit, connected to the inverting unit, and configured to output a negative half cycle of the first alternating current according to the second oscillation signal;

[0019] a current limiting component, connected to the first switch unit and the second switch unit, and configured to limit the current of the first alternating current;

[0020] The capacitor component is connected to the second switch unit and the isolation conversion module, and is configured to perform direct current isolation and alternating current passing processing on the first alternating current.

[0021] In one of the embodiments, the isolation conversion module includes a transformer;

[0022] The first primary end of the transformer and the second primary end of the transformer serve together as the first AC input end of the isolation conversion module, and are connected to the multivibrator module to input the first AC; the first secondary end of the transformer and the second secondary end of the transformer serve together as the second AC output end of the isolation conversion module, and are connected to the rectifier module to output the second AC.

[0023] In one embodiment, the rectifier module includes a first diode, a second diode, a sixth resistor, a fourth capacitor and a fifth capacitor;

[0024] The first end of the fourth capacitor, the positive electrode of the second diode, the first end of the fifth capacitor, and the first end of the sixth resistor together serve as the second AC input end of the rectifier module, and are connected to the isolation conversion module to input the second AC; the second end of the fourth capacitor is connected to the positive electrode of the first diode and the negative electrode of the second diode, the negative electrode of the first diode, the second end of the fifth capacitor, and the second end of the sixth resistor together serve as the power supply DC output end of the rectifier module, and are connected to the isolation circuit to output the power supply DC.

[0025] In one embodiment, the brake control circuit further includes:

[0026] an absorption circuit, connected in parallel with the switch tube, configured to absorb a peak voltage between the first end of the switch tube and the second end of the switch tube;

[0027] Among them, the first end of the switch tube is used to access the working voltage, and the second end of the switch tube is used to output the working voltage.

[0028] In one embodiment, the brake control circuit further includes:

[0029] a buffer circuit, connected to the isolation circuit, configured to access the first control signal and buffer the first control signal;

[0030] The isolation circuit is specifically configured to isolate the buffered first control signal based on the power supply DC power to output the second control signal.

[0031] In one embodiment, the brake control circuit further includes:

[0032] a voltage divider circuit connected to the isolation circuit and the switch tube, and configured to divide the second control signal to output the divided second control signal;

[0033] The switch tube is specifically configured to stop transmitting the working voltage to the brake coil based on the second control signal after voltage division.

[0034] In one embodiment, the isolation circuit includes a photocoupler and an eighth resistor, a ninth resistor and a sixth capacitor;

[0035] The first end of the eighth resistor serves as the first control signal input end of the isolation circuit to input the first control signal; the second end of the eighth resistor is connected to the first end of the ninth resistor, the first end of the sixth capacitor and the negative electrode of the photoelectric coupler, the second end of the ninth resistor, the second end of the sixth capacitor and the positive electrode of the photoelectric coupler are commonly connected to a third power supply, the collector of the photoelectric coupler serves as the DC power supply input end of the isolation circuit, and is connected to the isolation power supply to input the DC power supply; the emitter of the photoelectric coupler serves as the second control signal output end of the isolation circuit, and is connected to the control end of the switch tube to output the second control signal.

[0036] An embodiment of the present application further provides an electronic device, which includes the above-mentioned brake control circuit.

[0037] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the circuit cost is reduced by transmitting the working voltage to the brake coil or stopping the transmission of the working voltage to the brake coil through the switch tube, and the switch tube has high reliability and is not easy to be damaged; the input DC power and the power supply DC power are isolated by the isolation power supply, and the first control signal and the second control signal are isolated by the isolation circuit, which reduces the possibility of the working voltage causing damage to the circuit when a fault occurs when the switch tube is used in a high-voltage environment, thereby improving the safety of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical application in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of a brake control circuit provided in one embodiment of the present application;

[0040] Figure 2 Another structural schematic diagram of a brake control circuit provided in an embodiment of the present application;

[0041] Figure 3 Another structural schematic diagram of a brake control circuit provided in an embodiment of the present application;

[0042] Figure 4 Another structural schematic diagram of a brake control circuit provided in an embodiment of the present application;

[0043] Figure 5 Another structural schematic diagram of a brake control circuit provided in an embodiment of the present application;

[0044] Figure 6 Another structural schematic diagram of a brake control circuit provided in an embodiment of the present application;

[0045] Figure 7 A partial exemplary circuit schematic diagram of a brake control circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0048] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application 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 application.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] Figure 1 The structure diagram of the brake control circuit provided by an embodiment of the present application is shown. For the convenience of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0051] The above-mentioned brake control circuit includes a high-voltage rectifier circuit 50 and a brake coil L1. When the motor is working, the high-voltage rectifier circuit 50 is used to rectify the high-voltage alternating current and output a working voltage to supply power to the brake coil L1; the brake control circuit includes an isolated power supply 100, an isolation circuit 200 and a switch tube M1.

[0052] The isolated power supply 100 is configured to receive the input direct current VAA, isolate and convert the input direct current VAA, and output the power supply direct current.

[0053] The isolation circuit 200 is connected to the isolation power supply 100 and is configured to receive the first control signal CTRL and isolate the first control signal CTRL based on the power supply DC power to output a second control signal.

[0054] The switch tube M1 is connected to the isolation circuit 200 , the high-voltage rectification circuit 50 and the brake coil L1 , and is configured to stop transmitting the working voltage to the brake coil L1 based on the second control signal.

[0055] In a specific implementation, the switch tube M1 may be a field effect tube or an insulated gate bipolar transistor.

[0056] The brake control circuit may further include a freewheeling circuit 51 connected to the high-voltage rectifier circuit 50 , the switch tube M1 and the brake coil L1 , and used for discharging the electromotive force on the brake coil L1 when the switch tube M1 is turned off.

[0057] The working voltage is transmitted to the brake coil L1 or stopped through the switch tube M1, which reduces the circuit cost, and the switch tube M1 has high reliability and is not easy to be damaged; the input DC power VAA and the power supply DC are isolated through the isolation power supply 100, and the first control signal CTRL and the second control signal are isolated through the isolation circuit 200, which reduces the possibility of the working voltage damaging the circuit when the switch tube M1 is used in a high-voltage environment and a fault occurs, thereby improving the safety of the circuit. This circuit fills the gap that the motor brake control system of the elevator feed door and the discharge door in the lifting industry cannot use weak current control.

[0058] By way of example and not limitation, Figure 2 As shown, the isolated power supply 100 includes a multivibrator module 110 , an isolated conversion module 120 and a rectifier module 130 .

[0059] The multivibrator module 110 is configured to receive the input direct current VAA and perform self-excited multivibrator oscillation based on the input direct current VAA to output a first alternating current.

[0060] The isolation conversion module 120 is connected to the multivibrator module 110 and is configured to isolate and convert the first alternating current to output a second alternating current.

[0061] The rectifier module 130 is connected to the isolation conversion module 120 and the isolation circuit 200 , and is configured to rectify the second alternating current to output a power supply direct current.

[0062] The isolation conversion module 120 is used to isolate the first alternating current from the second alternating current, thereby reducing circuit interference and improving circuit safety.

[0063] By way of example and not limitation, Figure 3 As shown, the multivibrator module includes an oscillating unit 111 , an inverting unit 112 , a first switch unit 113 , a second switch unit 114 , a current limiting component 115 and a capacitor component 116 .

[0064] The oscillation unit 111 is configured to output a first oscillation signal.

[0065] The inverting unit 112 is connected to the oscillating unit 111 and configured to invert the first oscillating signal to output a second oscillating signal.

[0066] The first switch unit 113 is connected to the oscillation unit 111 , the inverting unit 112 and the isolation conversion module, and is configured to output a positive half cycle of the first alternating current according to the first oscillation signal.

[0067] The second switch unit 114 is connected to the inverting unit 112 and is configured to output the negative half cycle of the first alternating current according to the second oscillation signal.

[0068] The current limiting component 115 is connected to the first switch unit 113 and the second switch unit 114 and is configured to limit the current of the first alternating current.

[0069] The capacitor component 116 is connected to the second switch unit 114 and the isolation conversion module, and is configured to perform direct current isolation and alternating current passing processing on the first alternating current.

[0070] Compared with directly using an integrated oscillation module, the multivibrator module has lower cost.

[0071] By way of example and not limitation, Figure 4 As shown, the brake control circuit further includes an absorption circuit 300 .

[0072] The absorption circuit 300 is connected in parallel with the switch tube M1 and is configured to absorb the peak voltage between the first end of the switch tube M1 and the second end of the switch tube M1 .

[0073] The first end of the switch tube M1 is used to connect to the working voltage, and the second end of the switch tube M1 is used to output the working voltage.

[0074] The absorption circuit 300 may include a varistor RV1 .

[0075] The absorption circuit 300 reduces the high voltage spikes generated during the switching on and off of the switch tube M1 , reduces the possibility of damage to the switch tube M1 , and improves the reliability and stability of the circuit.

[0076] By way of example and not limitation, Figure 5 As shown, the brake control circuit further includes a buffer circuit 400 .

[0077] The buffer circuit 400 is connected to the isolation circuit 200 and is configured to receive the first control signal CTRL and buffer the first control signal CTRL.

[0078] The isolation circuit 200 is specifically configured to isolate the buffered first control signal CTRL based on the power supply DC power to output a second control signal.

[0079] In a specific implementation, the first control signal CTRL may be generated by a digital signal processing chip or a microprocessor.

[0080] The buffer circuit 400 prevents the DC power supply from impacting the digital signal processing chip or microprocessor when the isolation circuit 200 is damaged, thereby reducing the possibility of chip damage and further improving the reliability of the circuit.

[0081] By way of example and not limitation, Figure 6 As shown, the brake control circuit further includes a voltage divider circuit 500 .

[0082] The voltage divider circuit 500 is connected to the isolation circuit 200 and the switch tube M1, and is configured to divide the voltage of the first control signal CTRL to output the divided first control signal CTRL;

[0083] The switch tube is specifically configured to stop transmitting the working voltage to the brake coil based on the divided second control signal.

[0084] The second control signal is divided by the voltage divider circuit 500 to meet the applicable voltages of different switch tubes M1, thereby improving the practicality of the circuit.

[0085] Figure 7 A partial exemplary circuit structure of a brake control circuit provided in an embodiment of the present application is shown. For the sake of convenience, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0086] The isolation conversion module 120 includes a transformer T1 .

[0087] The first primary end of the transformer T1 and the second primary end of the transformer T1 serve together as the first AC input end of the isolation conversion module 120, and are connected to the multivibrator module 110 to input the first AC; the first secondary end of the transformer T1 and the second secondary end of the transformer T1 serve together as the second AC output end of the isolation conversion module 120, and are connected to the rectifier module 130 to output the second AC.

[0088] Isolation is achieved through transformer T1, which has high stability and good safety.

[0089] The rectifier module 130 includes a first diode D1 , a second diode D2 , a sixth resistor R6 , a fourth capacitor C4 , and a fifth capacitor C5 .

[0090] The first end of the fourth capacitor C4, the positive electrode of the second diode D2, the first end of the fifth capacitor C5, and the first end of the sixth resistor R6 together serve as the second AC input end of the rectifier module 130, and are connected to the isolation conversion module 120 to input the second AC power; the second end of the fourth capacitor C4 is connected to the positive electrode of the first diode D1 and the negative electrode of the second diode D2, the negative electrode of the first diode D1, the second end of the fifth capacitor C5, and the second end of the sixth resistor R6 together serve as the power supply DC output end of the rectifier module 130, and are connected to the isolation circuit 200 to output the power supply DC.

[0091] In a specific implementation, in the first stage, when the first transistor Q1 and the fourth transistor Q4 are turned on, and the second transistor Q2 and the third transistor Q3 are turned off, the voltage of the first terminal of the primary side of the transformer T1 is positive. According to the same-name terminal of the transformer T1, it can be known that the first terminal of the secondary side of the transformer T1 is positive at this time, the voltage of the first terminal of the fourth capacitor C4 is positive, and the voltage of the second terminal of the fourth capacitor C4 is negative. The first diode D1 rectifies the positive half cycle of the second alternating current, so that the cathode of the first diode D1, the second terminal of the fifth capacitor C5, and the second terminal of the sixth resistor R6 output the power supply DC to the isolation circuit. 200, wherein the voltage of the power supply DC at this time is the difference between the voltage at both ends of the secondary side of the transformer T1 and the voltage at both ends of the fourth capacitor C4; in the second stage, when the first transistor Q1 and the fourth transistor Q4 are turned off, and the second transistor Q2 and the third transistor Q3 are turned on, the voltage at the second end of the primary side of the transformer T1 is positive. According to the same-name terminal of the transformer T1, it can be known that the second end of the secondary side of the transformer T1 is positive at this time, the second diode D2 rectifies the negative half cycle of the second alternating current, and the negative half cycle of the second alternating current charges the fourth capacitor C4. The voltage at the first end of the fourth capacitor C4 is negative, and the The voltage at the second end of the four capacitors C4 is positive; in the third stage, when the output end of the third NAND gate N3 outputs a high level, the first transistor Q1 is turned on, and the second transistor Q2 is turned off. At this time, the output end of the fourth NAND gate N4 outputs a low level, the fourth transistor Q4 is turned on, and the third transistor Q3 is turned off. The emitter of the first transistor and the emitter of the second transistor output the positive half cycle of the first alternating current. At this time, the voltage at the first end of the primary side of the transformer T1 is positive, the first end of the secondary side of the transformer T1 is positive, and the transformer T1 outputs the positive half cycle of the second alternating current. Since the capacitor voltage cannot change suddenly, the first half cycle of the second alternating current is output at this time. The voltage at the first end of the four capacitors C4 is still negative, and the voltage at the first end and the second end of the fourth capacitor C4 is still positive, so that the voltage at both ends of the fifth capacitor C5 is the sum of the voltage at both ends of the fourth capacitor C4 and the voltage at the secondary side of the transformer T1 (the power supply DC power generated after superposition), and the power supply DC power generated after superposition is output from the cathode of the first diode D1 and the second end of the fifth capacitor C5 and the second end of the sixth resistor R6 to the isolation circuit 200; it should be noted that the rectifier module 130 then continuously repeats the second stage and the third stage, thereby continuously outputting the power supply DC power generated after superposition.

[0092] The circuit is simple and easy to build.

[0093] The isolation circuit 200 includes a photocoupler PC1, an eighth resistor R8, a ninth resistor R9, and a sixth capacitor C6.

[0094] The first end of the eighth resistor R8 serves as the first control signal input end of the isolation circuit 200 to input the first control signal CTRL; the second end of the eighth resistor R8 is connected to the first end of the ninth resistor R9, the first end of the sixth capacitor C6 and the negative electrode of the photoelectric coupler PC1, the second end of the ninth resistor R9, the second end of the sixth capacitor C6 and the positive electrode of the photoelectric coupler PC1 are commonly connected to the third power supply, the collector of the photoelectric coupler PC1 serves as the power supply DC input end of the isolation circuit 200, and is connected to the isolation power supply 100 to input the power supply DC; the emitter of the photoelectric coupler PC1 serves as the second control signal output end of the isolation circuit 200, and is connected to the control end of the switch tube M1 to output the second control signal.

[0095] The photocoupler PC1 is small in size and has high conversion efficiency.

[0096] The oscillation unit 111 includes a first NAND gate N1, a second NAND gate N2, a third NAND gate N3, a first resistor R1, a second resistor R2, and a first capacitor C1.

[0097] The first input end of the first NAND gate N1 is connected to the second input end of the first NAND gate N1 and the first end of the first resistor R1, the output end of the first NAND gate N1 is connected to the first input end of the second NAND gate N2, the second input end of the second NAND gate N2 and the first end of the second resistor R2, the second end of the first resistor R1 is connected to the second end of the second resistor R2 and the first end of the first capacitor C1, the output end of the second NAND gate N2 is connected to the first input end of the third NAND gate N3, the second input end of the third NAND gate N3 and the second end of the first capacitor C1, and the output end of the third NAND gate N3 is connected as the first oscillation signal output end of the oscillation unit 111, and is connected to the inverting unit 112 and the first switch unit 113 to output the first oscillation signal.

[0098] The inverting unit 112 includes a fourth NAND gate N4 .

[0099] The first input terminal of the fourth NAND gate N4 and the second input terminal of the fourth NAND gate N4 serve together as the first oscillation signal input terminal of the inverting unit 112, and are connected to the oscillation unit 111 and the first switch unit 113 to input the first oscillation signal; the output terminal of the fourth NAND gate N4 serves as the second oscillation signal output terminal of the inverting unit 112, and is connected to the second switch unit 114 to output the second oscillation signal.

[0100] The first switch unit 113 includes a first transistor Q1 , a second transistor Q2 , and a third resistor R3 .

[0101] The first end of the third resistor R3 serves as the first oscillation signal input end of the first switch unit 113, and is connected to the oscillation unit 111 and the inverting unit 112 to input the first oscillation signal; the second end of the third resistor R3 is connected to the base of the first transistor Q1 and the base of the second transistor Q2, and the collector of the first transistor Q1 is connected to the current limiting component 115; the emitter of the first transistor Q1 and the emitter of the second transistor Q2 serve together as the output end of the positive half cycle of the first alternating current of the first switch unit 113, and are connected to the isolation conversion module 120 to output the positive half cycle of the first alternating current; the collector of the second transistor Q2 is connected to the power ground.

[0102] The second switch unit 114 includes a third transistor Q3 , a fourth transistor Q4 , and a fourth resistor R4 .

[0103] The first end of the fourth resistor R4 serves as the second oscillation signal input end of the second switch unit 114, and is connected to the inverting unit 112 to input the second oscillation signal; the second end of the fourth resistor R4 is connected to the base of the third transistor Q3 and the base of the fourth transistor Q4, and the collector of the third transistor Q3 is connected to the current limiting component 115; the emitter of the third transistor Q3 and the emitter of the fourth transistor Q4 serve together as the output end of the negative half cycle of the first alternating current of the second switch unit 114, and are connected to the capacitor component 116 to output the negative half cycle of the first alternating current; the collector of the fourth transistor Q4 is connected to the power ground.

[0104] The current limiting component 115 includes a fifth resistor R5 .

[0105] The capacitor component 116 includes a second capacitor C2.

[0106] The multivibrator module 110 may further include a third capacitor C3, and the third capacitor C3 is used to filter the input direct current VAA.

[0107] The buffer circuit 400 includes a buffer U1 and a seventh resistor R7 .

[0108] The input terminal A of the buffer U1 and the first end of the seventh resistor R7 serve together as the first control signal CTRL input terminal of the buffer circuit 400, and are connected to the isolation circuit 200 to input the first control signal CTRL; the output terminal Y of the buffer U1 serves as the buffered first control signal CTRL output terminal of the buffer circuit 400 to output the buffered first control signal CTRL; the second end of the seventh resistor R7 is connected to the second power supply.

[0109] The voltage divider circuit 500 includes a tenth resistor R10, an eleventh resistor R11, and a seventh capacitor C7.

[0110] The first end of the tenth resistor R10 serves as the second control signal input end of the voltage divider circuit 500, and is connected to the isolation circuit 200 to input the second control signal; the second end of the tenth resistor R10, the first end of the eleventh resistor R11, and the first end of the seventh capacitor C7 serve together as the second control signal output end after voltage division, and are connected to the switch tube M1 to output the second control signal after voltage division, and the second end of the seventh capacitor C7 and the second end of the eleventh resistor R11 are connected to the analog ground.

[0111] The high voltage rectifying circuit 50 includes a third diode D3 .

[0112] The anode of the third diode D3 serves as the high-voltage AC input terminal of the high-voltage rectifier circuit 50 to input high-voltage AC power, and the cathode of the third diode D3 serves as the working voltage output terminal of the high-voltage rectifier circuit 50 and is connected to the first end of the switch tube M1 to output the working voltage.

[0113] The fast discharge circuit includes a fourth diode D4 and a twelfth resistor R12.

[0114] The twelfth resistor R12 may be a varistor.

[0115] The holding brake control circuit may further include a voltage stabilizing circuit 600. The voltage stabilizing circuit may include a voltage stabilizing diode Z1.

[0116] The voltage regulator diode Z1 is used to stabilize the voltage between the control end of the switch tube M1 and the second end of the switch tube M1 to reduce the possibility of damaging the switch tube M1 due to a sudden change in the voltage between the control end of the switch tube M1 and the second end of the switch tube M1.

[0117] The following is a combination of working principles Figure 7 As shown for further explanation:

[0118] The first end of the fifth resistor R5 and the first end of the third capacitor C3 are connected to the input direct current VAA, the output end of the third NAND gate N3 outputs the first oscillation signal to the first end of the third resistor R3, the first input end of the fourth NAND gate N4 and the second input end of the fourth NAND gate N4, the fourth NAND gate N4 inverts the first oscillation signal, and outputs the second oscillation signal from the output end of the fourth NAND gate N4 to the first end of the fourth resistor R4. In the first stage, when the output end of the third NAND gate N3 outputs the first oscillation signal of a high level, the first transistor Q1 is turned on, and the second transistor Q2 is turned off. At this time, the output end of the fourth NAND gate N4 outputs the second oscillation signal of a low level, the fourth transistor Q4 is turned on, the third transistor Q3 is turned off, the emitter of the first transistor and the emitter of the second transistor output the positive half cycle of the first alternating current, the input direct current is converted into the positive half cycle of the first alternating current by the first transistor Q1, and the positive half cycle of the first alternating current is transmitted through the primary side of the transformer T1, the second capacitor C2 and the fourth The transistor Q4 is connected to the power ground, and the fifth resistor R5 limits the current of the positive half cycle of the first alternating current. At this time, the voltage of the first terminal of the primary side of the transformer T1 is positive, the first terminal of the secondary side of the transformer T1 is positive, the transformer T1 outputs the positive half cycle of the second alternating current, and the voltage of the first terminal of the fourth capacitor C4 is positive. The voltage of the second terminal of the fourth capacitor C4 is negative, and the first diode D1 rectifies the positive half cycle of the second alternating current, so that the cathode of the first diode D1, the second terminal of the fifth capacitor C5, and the second terminal of the sixth resistor R6 output the power supply DC to the isolation circuit 200. Among them, the voltage of the power supply DC at this time is the difference between the voltage at both ends of the secondary side of the transformer T1 and the voltage at both ends of the fourth capacitor C4; in the second stage, when the output end of the third NAND gate N3 outputs a low-level first oscillation signal, the first transistor Q1 is turned off, and the second transistor Q2 is turned on. At this time, the output end of the fourth NAND gate N4 outputs a high-level second oscillation signal, the fourth transistor Q4 is turned off, the third transistor Q3 is turned on, and the second end of the second capacitor C2 outputs the negative half cycle of the first alternating current, and the input DC is converted into the negative half cycle of the first alternating current by the third transistor Q3. The negative half cycle of the first alternating current passes through the second capacitor C2, the primary side of the transformer T1 and the second transistor Q2 to the power ground. At this time, the fifth resistor R5 limits the current of the negative half cycle of the first alternating current. The voltage of the second terminal of the primary side of the transformer T1 is positive, the second terminal of the secondary side of the transformer T1 is positive, the transformer T1 outputs the negative half cycle of the second alternating current, the second diode D2 rectifies the negative half cycle of the second alternating current, and the negative half cycle of the second alternating current charges the fourth capacitor C4. The voltage of the first terminal of the fourth capacitor C4 is negative, and the voltage of the second terminal of the fourth capacitor C4 is positive.In the third stage, when the output end of the third NAND gate N3 outputs a high-level first oscillation signal, the first transistor Q1 is turned on and the second transistor Q2 is turned off. At this time, the output end of the fourth NAND gate N4 outputs a low-level second oscillation signal, the fourth transistor Q4 is turned on, the third transistor Q3 is turned off, and the emitter of the first transistor and the emitter of the second transistor output the positive half cycle of the first alternating current. At this time, the voltage of the first end of the primary side of the transformer T1 is positive, the first end of the secondary side of the transformer T1 is positive, and the transformer T1 outputs the positive half cycle of the second alternating current. Since the capacitor voltage cannot change suddenly, the voltage of the first end of the fourth capacitor C4 is still negative, and the voltage of the second end of the fourth capacitor C4 is still positive. Therefore, the voltage across the fifth capacitor C5 is the sum of the voltage across the fourth capacitor C4 and the voltage of the secondary side of the transformer T1 (the power supply DC generated after superposition), and the power supply DC generated after superposition is output from the negative electrode of the first diode D1, the second end of the fifth capacitor C5, and the second end of the sixth resistor R6 to the photoelectric coupler PC. 1 (it should be noted that the rectifier module 130 then continuously repeats the second stage and the third stage, thereby continuously outputting the power supply DC generated by superposition); the input terminal A of the buffer U1 and the first end of the seventh resistor R7 are connected to the first control signal CTRL, the buffer U1 buffers the first control signal CTRL, and outputs the buffered first control signal CTRL from the output terminal Y of the buffer U1 to the first end of the eighth resistor R8, the photoelectric coupler PC1 isolates the first control signal CTRL based on the power supply DC, and outputs the second control signal from the collector of the photoelectric coupler PC1 to the first end of the tenth resistor R10, the tenth resistor R10 and the eleventh resistor R11 divide the second control signal, and output the divided second control signal from the tenth resistor R10 and the eleventh resistor R11 and the first end of the seventh capacitor C7 to the control end of the switch tube M1, the switch tube M1 is turned off, and stops transmitting the working voltage to the brake coil L1, the brake coil L1 loses power, and the brake is realized. ;

[0119] An embodiment of the present application further provides an electronic device, which includes the above-mentioned brake control circuit.

[0120] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0121] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A brake control circuit, comprising a high-voltage rectifier circuit and a brake coil. When the motor is working, the high-voltage rectifier circuit is used to rectify the high-voltage alternating current and output a working voltage to supply power to the brake coil; characterized in that: The brake control circuit comprises: An isolated power supply, configured to receive input direct current, isolate and convert the input direct current, and output power supply direct current; an isolation circuit, connected to the isolation power supply, configured to receive a first control signal and isolate the first control signal based on the power supply DC power to output a second control signal; A switch tube is connected to the isolation circuit, the high-voltage rectification circuit and the brake coil, and is configured to stop transmitting the working voltage to the brake coil based on the second control signal.

2. The brake control circuit according to claim 1, characterized in that: The isolated power supply comprises: a multivibrator module, configured to be connected to the input direct current, and to perform self-excited multivibrator oscillation based on the input direct current to output a first alternating current; an isolation conversion module, connected to the multivibrator module, and configured to isolate and convert the first alternating current to output a second alternating current; A rectifier module is connected to the isolation conversion module and the isolation circuit, and is configured to rectify the second alternating current to output the power supply direct current.

3. The brake control circuit according to claim 2, characterized in that: The multivibrator module comprises: an oscillation unit, configured to output a first oscillation signal; an inverting unit, connected to the oscillating unit, and configured to invert the first oscillating signal to output a second oscillating signal; a first switch unit, connected to the oscillation unit, the inverting unit and the isolation conversion module, and configured to output a positive half cycle of the first alternating current according to the first oscillation signal; a second switch unit, connected to the inverting unit, and configured to output a negative half cycle of the first alternating current according to the second oscillation signal; a current limiting component, connected to the first switch unit and the second switch unit, and configured to limit the current of the first alternating current; The capacitor component is connected to the second switch unit and the isolation conversion module, and is configured to perform direct current isolation and alternating current passing processing on the first alternating current.

4. The brake control circuit according to claim 2, characterized in that: The isolation conversion module includes a transformer; The first primary end of the transformer and the second primary end of the transformer serve together as the first AC input end of the isolation conversion module, and are connected to the multivibrator module to input the first AC; the first secondary end of the transformer and the second secondary end of the transformer serve together as the second AC output end of the isolation conversion module, and are connected to the rectifier module to output the second AC.

5. The brake control circuit according to claim 2, characterized in that: The rectifier module includes a first diode, a second diode, a sixth resistor, a fourth capacitor and a fifth capacitor; The first end of the fourth capacitor, the positive electrode of the second diode, the first end of the fifth capacitor, and the first end of the sixth resistor together serve as the second AC input end of the rectifier module, and are connected to the isolation conversion module to input the second AC; the second end of the fourth capacitor is connected to the positive electrode of the first diode and the negative electrode of the second diode, the negative electrode of the first diode, the second end of the fifth capacitor, and the second end of the sixth resistor together serve as the power supply DC output end of the rectifier module, and are connected to the isolation circuit to output the power supply DC.

6. The brake control circuit according to claim 1, characterized in that: Also includes: an absorption circuit, connected in parallel with the switch tube, configured to absorb a peak voltage between the first end of the switch tube and the second end of the switch tube; Among them, the first end of the switch tube is used to access the working voltage, and the second end of the switch tube is used to output the working voltage.

7. The brake control circuit according to claim 1, characterized in that: Also includes: a buffer circuit, connected to the isolation circuit, configured to access the first control signal and buffer the first control signal; The isolation circuit is specifically configured to isolate the buffered first control signal based on the power supply DC power to output the second control signal.

8. The brake control circuit according to claim 1, characterized in that: Also includes: a voltage divider circuit connected to the isolation circuit and the switch tube, and configured to divide the second control signal to output the divided second control signal; The switch tube is specifically configured to stop transmitting the working voltage to the brake coil based on the second control signal after voltage division.

9. The brake control circuit according to any one of claims 1 to 6, characterized in that: The isolation circuit includes a photoelectric coupler, an eighth resistor, a ninth resistor and a sixth capacitor; The first end of the eighth resistor serves as the first control signal input end of the isolation circuit to input the first control signal; the second end of the eighth resistor is connected to the first end of the ninth resistor, the first end of the sixth capacitor and the negative electrode of the photoelectric coupler, the second end of the ninth resistor, the second end of the sixth capacitor and the positive electrode of the photoelectric coupler are commonly connected to a third power supply, and the collector of the photoelectric coupler serves as the power supply DC input end of the isolation circuit, and is connected to the isolation power supply to input the power supply DC; The emitter of the photoelectric coupler serves as the second control signal output terminal of the isolation circuit and is connected to the control terminal of the switch tube to output the second control signal.

10. An electronic device, characterized in that: The invention comprises a brake control circuit as claimed in any one of claims 1 to 9.

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