Motor band-type brake control circuit and motor band-type brake control system

Abstract

The utility model discloses a motor band-type brake control circuit and a motor band-type brake control system. The circuit comprises a band-type brake circuit, a control circuit, a detection circuit and a protection circuit. The band-type brake circuit is connected with the band-type brake power supply and the control circuit; the control circuit is connected with an external controller and receives a band-type brake control signal; the detection circuit is connected with the external controller and the band-type brake circuit, detects electric energy information of the band-type brake circuit and outputs the electric energy information; the first input end of the protection circuit is connected with the output end of the detection circuit, the second input end is connected with an external controller, and the output end of the protection circuit is connected with the control circuit; the second input end of the protection circuit receives a reference signal sent by an external controller, compares the electric energy information with the reference signal and outputs a comparison result to the control circuit; and the control circuit enables the band-type brake circuit to control the band-type brake motor of the band-type brake mechanism according to the band-type brake control signal or a comparison result of the protection circuit. The system has the technical characteristics of timely electric energy information detection, comprehensive protection functions and reliable motor braking.

Description

Technical Field

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

[0002] The motors used in industrial production and daily life are usually equipped with a brake mechanism. The motor brake is usually composed of a brake and a friction material. The brake is a device used to generate friction, and the friction material is used to transfer the friction of the brake to the motor or transmission system. When the motor or transmission system needs to stop running, the friction material of the brake will generate friction with the shaft of the motor or the shaft of the transmission system to keep it stopped. The existing technology mainly implements the brake drive part. In terms of protection circuits, some can realize disconnection detection or overcurrent protection, but the circuit is complex; the simple circuit solution cannot detect the voltage and current in real time; in different application scenarios, due to the different overcurrent and overvoltage points, it may not be possible to achieve flexible adjustment on site, and the brake cannot be braked in time, thus causing safety accidents. Utility Model Content

[0003] In view of this, the present application provides a motor brake control circuit and a motor brake, in order to solve the technical problems of incomplete protection, low reliability and eliminating the potential safety hazards of the motor brake circuit. Specifically, the technical solution of the present application is as follows:

[0004] A motor brake control circuit, comprising: a brake circuit, a control circuit, a detection circuit and a protection circuit;

[0005] A brake circuit connected to a brake power supply and a control circuit;

[0006] A control circuit is connected to an external controller and receives a brake control signal sent by the external controller;

[0007] A detection circuit is connected to the external controller and the brake circuit, detects the electric energy information of the brake circuit, and outputs the electric energy information to the external controller;

[0008] The first input end of the protection circuit is connected to the output end of the detection circuit, the second input end of the protection circuit is connected to the external controller, and the output end of the protection circuit is connected to the control circuit;

[0009] The second input terminal of the protection circuit receives a reference signal sent by an external controller, and compares the electric energy information with the reference signal and outputs a comparison result to the control circuit;

[0010] The control circuit controls the brake motor of the brake mechanism according to the brake control signal or the comparison result of the protection circuit.

[0011] In some implementations, the brake circuit includes: a brake coil and a first diode;

[0012] The positive electrode of the brake coil is connected to the negative electrode of the first diode;

[0013] The brake power supply is connected to the cathode of the first diode;

[0014] The cathode of the brake coil is connected to the anode of the first diode;

[0015] When the brake coil is energized, the reset spring of the brake mechanism is pressed to release the motor, and when the power is lost, the reset spring brake motor is released;

[0016] The first diode forms a freewheeling circuit when the brake coil loses power to release excess current.

[0017] In some implementations, the control circuit further includes: a brake switch, a switch tube, a first resistor, a second resistor, a third resistor, and a first voltage regulator tube;

[0018] The drain of the switch tube is connected to the negative electrode of the brake coil, the source of the switch tube is grounded through a third resistor, the gate of the switch tube is connected to the output end of the brake switch through a first resistor, and the gate of the switch tube is also grounded through a second resistor;

[0019] The positive electrode of the first voltage regulator tube is grounded, and the negative electrode of the first voltage regulator tube is connected to the gate of the switch tube;

[0020] The input end of the brake switch is connected to the brake power supply, and the control end of the brake switch is connected to the external controller to receive the brake control signal;

[0021] The input end of the brake switch is also connected to the output end of the protection circuit and inputs the comparison result.

[0022] In some implementations, the detection circuit specifically includes: a first operational amplifier, a fourth resistor, a fifth resistor, a second diode, and a third diode;

[0023] One end of the fourth resistor is connected to the negative electrode of the brake coil, and the other end is grounded through the fifth resistor;

[0024] An anode of the second diode is connected between the fourth resistor and the fifth resistor, and a cathode of the second diode is connected to a non-inverting input terminal of the first operational amplifier;

[0025] The anode of the third diode is connected to the source of the switch tube, and the cathode of the third diode is connected to the non-inverting input terminal of the first operational amplifier;

[0026] An inverting input terminal of the first operational amplifier is connected between the third resistor and a ground terminal of the third resistor, and an output terminal of the first operational amplifier is connected to an external controller.

[0027] In some implementations, the protection circuit includes: a second operational amplifier;

[0028] The non-inverting input terminal of the second operational amplifier is connected to the reference signal sent by the external controller, and the inverting input terminal of the second operational amplifier is connected to the output terminal of the first operational amplifier;

[0029] The output end of the second operational amplifier is connected to the brake switch.

[0030] In some implementations, a second voltage regulator tube is also included;

[0031] The cathode of the second voltage-stabilizing tube is connected to the drain of the switch tube, and the anode of the second voltage-stabilizing tube is connected to the fourth resistor.

[0032] In some implementations, a sixth resistor is further included;

[0033] One end of the sixth resistor is connected to the external power supply, and the other end is connected to the output end of the second operational amplifier.

[0034] In some implementations, the brake switch is an isolation optocoupler.

[0035] or,

[0036] The brake switch is a switch tube.

[0037] or,

[0038] The brake switch is a triode.

[0039] Based on the same technical concept, the present application also provides a motor brake control system, including: a processor, a brake mechanism, and any of the above-mentioned motor brake control circuits;

[0040] The motor brake control circuit is connected to the processor, and the motor brake control circuit is also connected to the brake mechanism.

[0041] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0042] 1. The detection circuit and protection circuit designed in this application can cooperate with each other. The detection circuit can effectively detect the electric energy information of the brake circuit. In addition, for circuit faults and abnormal conditions such as overcurrent, overvoltage, undervoltage, and disconnection that may exist in the circuit, the detection result of the detection circuit is combined with the reference signal preset by the protection circuit, so that the brake circuit can be controlled by the control circuit, and the brake motor can be braked in time to protect the safety of on-site use. At the same time, this application controls the power supply and power loss of the brake coil in the brake circuit through the control circuit, so that the motor brake can flexibly realize the brake effect on the motor. The control process of the control circuit does not need to be executed by the processor, and the structure is simple. Therefore, this application has the technical effect of comprehensive circuit protection and timely elimination of safety hazards.

[0043] 2. The control circuit, detection circuit and protection circuit provided in the present application have a simple structure and high reliability. In the process of overcurrent and overvoltage detection, real-time detection of electrical energy information such as current and voltage can be achieved only through the first operational amplifier, and the circuit protection function of overcurrent and overvoltage can be realized through the cooperation of the second operational amplifier and the control circuit.

[0044] 3. The control circuit provided in this application has a technical effect with a wide range of application scenarios. In particular, in different application scenarios, due to the different requirements for relay protection such as overcurrent and overvoltage points, the existing technology cannot be flexibly adjusted according to the actual application situation. However, this application can achieve rapid adjustment by adjusting the overcurrent and overvoltage reference signals preset to the protection circuit through software, thereby performing braking in time and effectively preventing the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.

[0046] Figure 1 1 is a circuit structure diagram of a motor brake control circuit according to an embodiment of the present application;

[0047] Figure 2 It is a circuit diagram of a motor brake control circuit implemented in the present application;

[0048] Figure 3 It is a circuit diagram of another motor brake control circuit implemented in the present application.

[0049] Description of the accompanying drawings: 100 - brake circuit, 200 - control circuit, 300 - detection circuit, 400 - protection circuit, S1 - brake control signal, S2 - power information, S3 - reference signal. DETAILED DESCRIPTION

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0051] In order to simplify the drawings, only the parts related to the application are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0052] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0053] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0055] The brake on the motor refers to a device used to maintain the brake state in the motor or transmission system, so that the load driven by the motor stops instantly after the motor is powered off, and rotates without being affected by the inertia of movement and load. After the motor is powered off, the motor will continue to run due to the inertia of the load. At this time, the brake takes effect, causing the movement to stop suddenly. This application is for example, cutting machines and other equipment using motors. Another state of rotation due to load influence is that the load is a counter-torque load, such as a crane load. When the motor is powered off, the motor will reverse, and the hoisted weight will fall under the action of gravity. At this time, the brake takes effect to prevent the weight from falling. The brake keeps the motor or transmission system in a stopped state when it stops running, preventing it from moving or rotating. The brake is usually composed of a brake and a friction material. The brake is a device used to generate friction, and the friction material is used to transfer the friction of the brake to the motor or transmission system. When the motor or transmission system needs to stop running, the friction material of the brake will generate friction with the shaft of the motor or the shaft of the transmission system to keep it in a stopped state. Existing brake devices usually have complex circuit structures, require external controllers to implement the brake control process, and cannot detect the current and voltage of the brake circuit in real time. As a result, when broken wires, short circuits, overvoltages, and overcurrents occur in the complex brake circuit, the brake cannot be performed in time, causing production hazards and threatening personal safety.

[0056] In view of this, please refer to the attached manual Figure 1 , a motor brake control circuit provided in the present application includes: a brake circuit 100, a control circuit 200, a detection circuit 300 and a protection circuit 400. The brake circuit 100 is connected to a brake power supply VBP and the control circuit 200;

[0057] The control circuit 200 is connected to the external controller and receives the brake control signal S1 sent by the external controller;

[0058] The detection circuit 300 is connected to the external controller and the brake circuit 100, detects the power information of the brake circuit 100, and outputs the power information S2 to the external controller;

[0059] The first input terminal of the protection circuit 400 is connected to the output terminal of the detection circuit 300, the second input terminal of the protection circuit 400 is connected to the external controller, and the output terminal of the protection circuit 400 is connected to the control circuit 200;

[0060] The second input terminal of the protection circuit 400 receives the reference signal S3 sent by the external controller, and compares the power information S2 with the reference signal S3 and outputs the comparison result to the control circuit 200;

[0061] The control circuit 200 enables the brake circuit 100 to control the brake mechanism to brake the motor according to the brake control signal S1 or the comparison result of the protection circuit 400 .

[0062] The overall brake process of the traditional motor brake is mainly realized by a main controller. The present application forms a circuit structure by combining simple components. It can realize rapid shutdown of abnormal working conditions and eliminate safety hazards while monitoring the current and voltage of the circuit in real time through a simpler circuit structure. Under the control of the control circuit 200, the brake circuit 100 enables the brake mechanism of the motor to brake the motor. In terms of its own braking function, in addition to braking according to the brake control signal S1 sent by the external controller by the control circuit 200, the detection circuit 300 in the circuit of the present application can realize real-time detection of the current and voltage in the circuit, and output it to the external controller to view the specific real-time voltage and real-time current. In addition, the detection circuit 300 and the protection circuit 400 cooperate with each other. When the comparison result is output to the protection circuit 400, it is compared with the reference signal S3 input by the external controller to determine whether there is a fault in the circuit. Then, through the protection circuit 400, the control circuit 200 controls the brake circuit when a circuit fault occurs, thereby realizing the brake mechanism braking the motor and eliminating safety hazards.

[0063] Reference Manual Attached Figure 2The motor brake control circuit 100 further includes: a brake coil BK and a first diode D1.

[0064] The anode of the brake coil BK is connected to the cathode of the first diode D1 , the brake power source VBP is connected to the cathode of the first diode D1 , and the cathode of the brake coil BK is connected to the anode of the first diode D1 .

[0065] When the brake coil BK is energized, it compresses the reset spring of the brake mechanism to release the motor, and when it is de-energized, it releases the reset spring brake motor;

[0066] The first diode forms a freewheeling circuit when the brake coil BK loses power to release excess current.

[0067] The control circuit 200 includes: a brake switch PC1, a switch tube Q1, a first resistor R1, a second resistor R2, a third resistor R3, a first voltage regulator tube Z1 and the brake switch PC1.

[0068] The drain of the switch tube Q1 is connected to the negative electrode of the brake coil BK, the source of the switch tube Q1 is grounded through the third resistor R3, the gate of the switch tube Q1 is connected to the output end of the brake switch PC1 through the first resistor R1, the gate of the switch tube Q1 is also grounded through the second resistor R2, the positive electrode of the first voltage-stabilizing tube Z1 is grounded, the negative electrode of the first voltage-stabilizing tube Z1 is connected to the gate of the switch tube Q1, the input end of the brake switch PC1 is connected to the brake power supply VBP, the control end of the brake switch PC1 is connected to the external controller, and the brake control signal S1 is connected.

[0069] Specifically, when the control end of the brake switch PC1 receives an external control signal, so that the brake switch PC1 is in the disconnected state, the brake coil BK and the brake power supply cannot form a loop, that is, the control circuit 200 controls the brake circuit 100 to cut off the power. In this state, the brake coil BK in the brake circuit 100 will release the reset spring to brake the main shaft of the motor, and prevent it from rotating through friction, so as to achieve the purpose of braking the motor. In addition, when the user selects a higher or lower grade voltage-resistant device according to the design of the switch tube Q1 and the brake switch PC1, the flexibility and reliability of the overall design solution will be correspondingly improved. When the control end of the brake switch PC1 receives the external brake control signal S1, so that the brake switch PC1 is in the on state, the brake power supply and the brake switch PC1 provide a turn-on signal for the gate of the switch tube Q1, and the brake power supply voltage is divided into a voltage value suitable for driving the switch tube Q1 through the voltage division effect of the first resistor R1 and the second resistor R2, and a voltage drop is formed on the third resistor R3 and the fourth resistor R4, turning on the switch tube Q1, so that the control circuit 200 controls the brake circuit 100 to be energized. When the brake coil BK is energized, the brake coil BK compresses the reset spring to release the motor, and the motor can rotate normally.

[0070] The first voltage regulator tube Z1 prevents the high-frequency noise interference on the brake power supply from causing overvoltage or damage to the switch tube Q1. At the same time, due to the physical characteristics of the brake coil BK, it can be regarded as an energy storage component when it is powered on. When the control circuit 200 controls the brake circuit 100 to be powered off, the electric power stored in the brake coil BK cannot be released immediately, and will be gradually discharged, which will greatly affect the braking sensitivity of the brake circuit 100. At the same time, the residual electric energy in the circuit will also affect other components, causing heating or signal interference, thereby reducing the service life of the device and the signal stability of the overall equipment. At the same time, since the first diode will charge the brake power supply during the freewheeling period, causing the brake power supply voltage to rise, the first voltage regulator tube Z1 also prevents overvoltage from causing damage to the switch tube Q1. Therefore, in this embodiment, a first diode D1 is provided to form a freewheeling circuit through the brake coil BK and the first diode D1 when the brake coil BK loses power, and release the excess current in the brake coil BK, thereby improving the braking sensitivity of the motor brake and ensuring reliable motor braking.

[0071] To ensure that the brake coil BK is not turned on due to the current flowing through the fourth resistor R4 when the switch tube Q1 is turned off, professionals in this field need to consider that the resistance of the fourth resistor R4 can limit the conduction current of the brake coil BK when setting it.

[0072] In one implementation, the motor brake control circuit, the detection circuit 300 is connected to the control circuit 200 and is used to detect the current and voltage of the brake circuit 100 .

[0073] Reference Manual Attached Figure 2 The circuit diagram of the motor brake control circuit, the detection circuit 300 includes: a first operational amplifier U1, a fourth resistor R4, a fifth resistor R5, a second diode D2 and a third diode D3;

[0074] One end of the fourth resistor R4 is connected to the negative electrode of the brake coil BK, and the other end is grounded through the fifth resistor R5;

[0075] The anode of the second diode D2 is connected between the fourth resistor R4 and the fifth resistor R5, and the cathode of the second diode D2 is connected to the non-inverting input terminal of the first operational amplifier U1;

[0076] The anode of the third diode D3 is connected to the source of the switch tube Q1, and the cathode of the third diode D3 is connected to the non-inverting input terminal of the first operational amplifier U1;

[0077] An inverting input terminal of the first operational amplifier U1 is connected between the third resistor R3 and a ground terminal of the third resistor R3 , and an output terminal of the first operational amplifier U1 is connected to an external controller.

[0078] Specifically, the current detection method implemented by the detection circuit 300 is that the third resistor R3 is used as a current sampling resistor, and the first operational amplifier U1 outputs the detected electric energy information S2 to the external controller, and the electric energy information S2 is detected by the external controller. The voltage detection method is that the fifth resistor R5 is used as a voltage sampling resistor. When the power is just turned on, the switch tube Q1 is not turned on at this time, the voltage value of the negative electrode of the brake coil BK is the voltage of the brake power supply, and the voltage across the fifth resistor R5 is the voltage divided value of the fourth resistor R4 and the fifth resistor R5 of the brake power supply in series. The voltage across the fifth resistor R5 increases as the voltage of the brake power supply increases, and this voltage is input to the first operational amplifier U1 through the second diode D2. When the voltage exceeds the maximum voltage, the first operational amplifier U1 outputs the electric energy information S2 to the external controller, and the electric energy information S2 can be detected by the external controller. Furthermore, the external controller receives the electric energy information S2 and can output a brake control signal S1 to the control circuit 200 according to the control logic inside the controller, so that the entire motor brake control circuit brakes or releases the motor to achieve overcurrent or overvoltage protection.

[0079] In one implementation, the protection circuit 400 of the motor brake control circuit is connected to the detection circuit 300 and is used to protect the motor brake control circuit according to the detection result of the detection circuit 300 .

[0080] Reference Manual Attached Figure 2 The circuit diagram of the motor brake control circuit, the protection circuit 400 includes: a second operational amplifier U2;

[0081] The non-inverting input terminal of the second operational amplifier U2 is connected to the reference signal S3 sent by the external controller, the reference signal includes a reference voltage and a reference current, and the inverting input terminal of the second operational amplifier U2 is connected to the output terminal of the first operational amplifier U1;

[0082] The output end of the second operational amplifier U2 is connected to the brake switch PC1.

[0083] The current detection and overcurrent protection are implemented by using the third resistor R3 as a current sampling resistor, and the first operational amplifier U1 inputs the detected signal to the external controller. At the same time, the electric energy information S2 is also input into the inverting input terminal of the second operational amplifier U2, and the non-inverting input terminal of the second operational amplifier U2 is the overcurrent reference signal S3 output by the external controller. When the current represented by the electric energy information S2 is greater than the overcurrent reference signal S3, that is, the output voltage of the first operational amplifier U1 is greater than the overcurrent reference voltage, the second operational amplifier U2 outputs a low level, and the brake switch is not turned on at this time, achieving the purpose of rapid overcurrent protection. At the same time, the electric energy information S2 of the first operational amplifier U1 is input into the external controller, and the abnormal overcurrent signal at this time can be detected.

[0084] The voltage detection, overvoltage and undervoltage protection are implemented in that the fifth resistor R5 is a voltage sampling resistor. When the power is just turned on, the switch tube Q1 is not turned on, and the voltage value of the negative electrode of the brake coil BK is the voltage of the brake power supply. The voltage across the fifth resistor R5 is the voltage divided by the fourth resistor R4 and the fifth resistor R5 of the brake power supply in series. The voltage across the fifth resistor R5 increases as the voltage of the brake power supply increases. This voltage is input to the non-inverting input terminal of the first operational amplifier U1 through the second diode D2. When the voltage exceeds the maximum voltage, the electric energy information S2 output by the first operational amplifier U1 is greater than the overvoltage reference signal S3. At this time, the second operational amplifier U2 outputs a low level, so that the brake switch PC1 is not turned on, achieving the purpose of rapid overvoltage protection. At the same time, the output signal of the first operational amplifier U1 is sent to the external controller to detect the electric energy information S2.

[0085] The disconnection detection is implemented in that when the switch tube Q1 is turned off, the detected voltage is approximately 0, or when the switch tube Q1 is turned on, the detected current value is approximately 0, and it is determined that the brake circuit 100 is disconnected.

[0086] Therefore, the control circuit provided by the present application has a technical effect with a wide range of application scenarios, especially in the application on different types of brake devices. Due to the different requirements of relay protection such as overcurrent and overvoltage points, the existing technology cannot be flexibly adjusted according to the actual application situation. The present application can achieve rapid adjustment by adjusting the overcurrent and overvoltage reference signals through software, and can be quickly adapted to specific brake device models.

[0087] In one implementation, refer to the attached specification. Figure 2 , the motor brake control circuit also includes a sixth resistor R6;

[0088] One end of the sixth resistor R6 is connected to the external power supply, and the other end is connected to the output end of the second operational amplifier U2.

[0089] In one implementation, refer to the attached specification. Figure 3 The motor brake control circuit also includes a second voltage regulator tube Z2;

[0090] The cathode of the second voltage-stabilizing tube Z2 is connected to the drain of the switch tube Q1 , and the anode of the second voltage-stabilizing tube Z2 is connected to the fourth resistor R4 .

[0091] Specifically, in a circuit without the second voltage regulator Z2, when the brake power supply voltage value is large, in order to ensure that when the switch tube Q1 is turned off, the current passing through the fourth resistor R4 and the fifth resistor R5 cannot make the brake coil BK conductive, so the fourth resistor R4 and the fifth resistor R5 are required to have large resistance values. Since the fifth resistor R5 is also used as a sampling resistor, it is generally required to have a small resistance value. Therefore, the voltage division value across the fifth resistor R5 will be small, and the fourth resistor R4 will require a large voltage division value. At this time, the resistance values ​​between the fourth resistor R4 and the fifth resistor R5 will be very different, resulting in the accuracy of the fifth resistor R5 with a large resistance value affecting the sampling accuracy of the fourth resistor R4 with a small resistance value. Therefore, setting the second voltage regulator Z2 can achieve a large voltage reduction of the brake power supply voltage. The voltage across the fourth resistor R4 and the fifth resistor R5 is the brake power supply voltage minus the voltage drop of the second voltage regulator Z2. Adjusting the voltage regulation value of the second voltage regulator Z2 can achieve the selection requirements of the same order of magnitude for the fourth resistor R4 and the fifth resistor R5, thereby improving the detection accuracy of the circuit.

[0092] In one implementation, the brake switch PC1 mentioned in the motor brake control circuit of the above embodiment can be an isolated optocoupler, the purpose of which is to enhance the system's anti-interference ability. If the system interference is small, it can also be replaced by a transistor and an ordinary operational amplifier. No specific limitation is made here. Professional and technical personnel in this field can choose to use it according to the actual application of the circuit, but the application combined with the above embodiment is within the scope of protection of this application.

[0093] In one implementation, the motor brake control circuit does not include the sixth resistor R6, and is directly connected to the brake switch PC1 through the output end of the second operational amplifier U2, thereby saving components and reducing production costs.

[0094] Based on the same technical concept, the present application also provides a motor brake control system, including a processor, a brake mechanism, and a motor brake control circuit in any of the above embodiments. The motor brake control circuit is connected to the processor, and the motor brake control circuit is also connected to the brake mechanism.

[0095] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A motor brake control circuit, characterized in that: include: Braking circuit, control circuit, detection circuit and protection circuit; The brake circuit is connected to the brake power supply and the control circuit; The control circuit is connected to the external controller and receives a brake control signal sent by the external controller; The detection circuit is connected to the external controller and the brake circuit, detects the electric energy information of the brake circuit, and outputs the electric energy information to the external controller; The first input end of the protection circuit is connected to the output end of the detection circuit, the second input end of the protection circuit is connected to the external controller, and the output end of the protection circuit is connected to the control circuit; The second input terminal of the protection circuit receives the reference signal sent by the external controller, compares the electric energy information with the reference signal and outputs the comparison result to the control circuit; The control circuit enables the brake circuit to control the brake motor of the brake mechanism according to the brake control signal or the comparison result of the protection circuit.

2. A motor brake control circuit according to claim 1, characterized in that: The brake circuit comprises: a brake coil and a first diode; The positive electrode of the brake coil is connected to the negative electrode of the first diode; The brake power supply is connected to the cathode of the first diode; The cathode of the brake coil is connected to the anode of the first diode; When the brake coil is energized, the reset spring of the brake mechanism is pressed to release the motor, and when the brake coil is de-energized, the reset spring is released to brake the motor; The first diode forms a freewheeling circuit when the brake coil loses power to release excess current.

3. A motor brake control circuit according to claim 2, characterized in that: The control circuit comprises: a brake switch, a switch tube, a first resistor, a second resistor, a third resistor and a first voltage regulator tube; The drain of the switch tube is connected to the negative electrode of the brake coil, the source of the switch tube is grounded through the third resistor, the gate of the switch tube is connected to the output end of the brake switch through the first resistor, and the gate of the switch tube is also grounded through the second resistor; The positive electrode of the first voltage regulator tube is grounded, and the negative electrode of the first voltage regulator tube is connected to the gate of the switch tube; The input end of the brake switch is connected to the brake power supply, and the control end of the brake switch is connected to the external controller and receives the brake control signal; The input end of the brake switch is also connected to the output end of the protection circuit and receives the comparison result.

4. A motor brake control circuit according to claim 3, characterized in that: The detection circuit specifically includes: a first operational amplifier, a fourth resistor, a fifth resistor, a second diode and a third diode; One end of the fourth resistor is connected to the negative electrode of the brake coil, and the other end is grounded through the fifth resistor; The anode of the second diode is connected between the fourth resistor and the fifth resistor, and the cathode of the second diode is connected to the non-inverting input terminal of the first operational amplifier; The anode of the third diode is connected to the source of the switch tube, and the cathode of the third diode is connected to the non-inverting input terminal of the first operational amplifier; An inverting input terminal of the first operational amplifier is connected between the third resistor and a ground terminal of the third resistor, and an output terminal of the first operational amplifier is connected to the external controller.

5. A motor brake control circuit according to claim 4, characterized in that: The protection circuit comprises: a second operational amplifier; The non-inverting input terminal of the second operational amplifier is connected to the reference signal sent by the external controller, and the inverting input terminal of the second operational amplifier is connected to the output terminal of the first operational amplifier; The output terminal of the second operational amplifier is connected to the brake switch.

6. A motor brake control circuit according to claim 4, characterized in that: Also includes a second voltage regulator tube; The cathode of the second voltage regulator tube is connected to the drain of the switch tube, and the anode of the second voltage regulator tube is connected to the fourth resistor.

7. A motor brake control circuit according to claim 5, characterized in that: Also including a sixth resistor; One end of the sixth resistor is connected to the external power supply, and the other end is connected to the output end of the second operational amplifier.

8. The motor brake control circuit according to claim 3, characterized in that: The brake switch is an isolation optocoupler. or, The brake switch is a switch tube. or, The brake switch is a triode.

9. A motor brake control system, characterized in that: include: A processor, a brake mechanism, and a motor brake control circuit according to any one of claims 1 to 8; The motor brake control circuit is connected to the processor, and the motor brake control circuit is also connected to the brake mechanism.

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