阅读说明：本技术 一种电动伺服机构高压能耗制动配电设备 (High-voltage energy consumption braking power distribution equipment of electric servo mechanism ) 是由 花伟峰 陈名胜 张婷婷 丁景义 于 2020-12-15 设计创作，主要内容包括：本发明公开了一种电动伺服机构高压能耗制动配电设备,包括滤波电路、高压供电电路、软启动电路、能耗制动电路和能耗制动控制电路；其中：高压供电电路,用于为电动伺服机构提供电压；软启动电路,分别与高压供电电路和滤波电路连接,用于降低启动瞬间电流；能耗制动电路,用于实现抑制电机反向电压对母线的冲击,降低直流侧母线电压；能耗制动控制电路,用于触发所述能耗制动电路,使其实现降低直流侧母线电压的功能。本发明主要用于运载火箭高压伺服机构地面配电系统中,不仅可防止电机启动电流过高、也可抑制电机制动运行时直流侧母线电压升高过高的情况,起到保护箭上伺服控制器中功率主电路和控制电路的作用。(The invention discloses high-voltage energy consumption braking power distribution equipment of an electric servo mechanism, which comprises a filter circuit, a high-voltage power supply circuit, a soft start circuit, an energy consumption braking circuit and an energy consumption braking control circuit, wherein the filter circuit is connected with the high-voltage power supply circuit; wherein: the high-voltage power supply circuit is used for supplying voltage to the electric servo mechanism; the soft start circuit is respectively connected with the high-voltage power supply circuit and the filter circuit and is used for reducing the starting instantaneous current; the energy consumption braking circuit is used for inhibiting the impact of reverse voltage of the motor on the bus and reducing the voltage of the bus on the direct current side; and the energy consumption braking control circuit is used for triggering the energy consumption braking circuit to realize the function of reducing the voltage of the direct-current side bus. The invention is mainly used in the ground power distribution system of the high-voltage servo mechanism of the carrier rocket, can prevent the situation that the starting current of the motor is overhigh, can inhibit the voltage of a direct-current side bus from rising overhigh during the braking operation of the motor, and plays a role in protecting a power main circuit and a control circuit in a rocket-mounted servo controller.)

1. The utility model provides an electric servo high pressure dynamic braking distribution equipment, includes filter circuit, filter circuit includes electric capacity C, its characterized in that, distribution equipment still includes: the system comprises a high-voltage power supply circuit, a soft start circuit, an energy consumption braking circuit and an energy consumption braking control circuit; wherein:

the high-voltage power supply circuit is used for supplying voltage to the electric servo mechanism;

the soft start circuit is respectively connected with the high-voltage power supply circuit and the filter circuit and is used for reducing the starting instantaneous current;

the energy consumption braking circuit is connected with the filter circuit and is used for inhibiting the impact of reverse voltage of the motor on the bus and reducing the voltage of the bus on the direct current side;

and the energy consumption braking control circuit is connected with the energy consumption braking circuit and is used for triggering the energy consumption braking circuit to realize the function of reducing the voltage of the direct-current side bus.

2. The power distribution apparatus of claim 1, wherein the high voltage supply circuit comprises: the system comprises a 380V alternating current power supply, a three-phase power frequency rectifying circuit and an input filter circuit; the 380V alternating current power supply is rectified by the three-phase power frequency rectifying circuit to form pulsating direct current voltage, and the pulsating direct current voltage is rectified by the input filter circuit to generate stable direct current voltage.

3. The power distribution apparatus of claim 1, wherein the soft start circuit comprises: current limiting resistors R14 and R16, a capacitor C15 and a field effect transistor V8; the gate of the V8 is connected with one end of the C15; the R16 is connected in series with R14; the C15 is connected in parallel with R14.

4. The electrical distribution apparatus of claim 1, wherein the dynamic braking circuit comprises: brake resistor R15, IGBT tube V7; one end of R15 is connected to the collector of V7; the other end of the R15 is connected with the anode of the capacitor C; the emitter of the V7 is connected with the cathode of the capacitor C; a diode is connected between the collector and emitter of V7.

5. The electrical distribution apparatus of claim 1, wherein the dynamic braking control circuit comprises a voltage divider unit, a comparison unit, and a power switch unit; wherein:

the voltage dividing unit provides a measured voltage and a reference voltage for the comparison unit;

if the measured voltage is greater than the reference voltage, the comparison unit drives the power switch unit, and the power switch unit drives the energy consumption braking circuit to work;

if the measured voltage is less than the reference voltage, the comparison unit does not drive the power switch unit, and the energy consumption braking circuit does not work.

6. The power distribution apparatus of claim 5, wherein the voltage divider unit further comprises: the circuit comprises a resistor R1, a resistor R4, a resistor R5, a resistor R7, a resistor R10, a potentiometer RP1, a capacitor C1, a capacitor C3 and a transient suppression diode D5;

the comparison unit includes: the circuit comprises a comparator U2A, a capacitor C2, a resistor R8, a light-emitting diode D1, a resistor R3 and a resistor R2;

a first pin of the resistor R5 is connected with a positive electrode of a capacitor C, a second pin of the resistor R5 is connected with a first pin of a potentiometer RP1, a second pin of the potentiometer RP1 is connected with a first pin of a resistor R10, a middle pin of the potentiometer RP1 is respectively connected with a first pin of a capacitor C3, a first pin of a resistor R10, a negative electrode of a transient suppression diode D5 and a first pin of a resistor R7, a second pin of the resistor R10 is connected with a negative electrode of the capacitor C, a second pin of the resistor R10, a second pin of the capacitor C3 and a positive electrode of the transient suppression diode are all grounded, and a second pin of the resistor R7 is connected with a negative input pin of a comparator U2A;

a first pin of the resistor R1 is connected with a 5V power supply, a second pin of the resistor R1 is respectively connected with a first pin of a ground resistor R4, a first pin of a capacitor C1, a first pin of the resistor R2 and a positive input pin of the comparator U2A, and a second pin of the capacitor C1 and a second pin of the resistor R4 are both grounded;

a second pin of the resistor R2 is respectively connected with a cathode of the light-emitting diode D1, an output pin of the comparator U2A and a first pin of the resistor R8, an anode of the light-emitting diode D1 is connected with a first pin of the resistor R3, and a second pin of the resistor R3 is connected with a 5V power supply; the positive side power supply pin of the comparator U2A is respectively connected with the first pin of the capacitor C2 and the 5V power supply, the second pin of the capacitor C2 is grounded, and the negative side power supply pin of the comparator U2A is grounded.

7. The power distribution apparatus of claim 6, wherein the power switching unit further comprises: the driving circuit comprises a driving chip U1, a resistor R6, a resistor R9, a resistor R11, a resistor R12, a transient suppression diode D2, a diode D3, a transient suppression diode D4, a transient suppression diode D6, a light emitting diode D7 and an optical coupler U3; wherein, U1 is a driving chip M57962L;

a fourth pin of the U1 is connected with a 24V power supply, and a fourteenth pin is connected with a 5V power supply; a first pin of the U1 is connected with the negative electrode of the D2, the positive electrode of the D2 is connected with the positive electrode of the D3, and the positive electrode of the D3 is connected with the collector electrode of the IGBT tube V7;

the thirteenth pin of U1 is connected to the second pin of R8; a fifth pin of the U1 is connected with a first pin of the R6, and a second pin of the R6 is respectively connected with the first pin of the R9, the cathode of the D4 and the gate of the IGBT tube V7; the positive electrode of D4 is connected with the positive electrode of D6, and the negative electrode of D6 is respectively connected with the second pin of R9 and the emitter of the IGBT tube V7; the eighth pin of the U1 is connected with the first pin of the R12, and the second pin of the R12 is connected with the negative input end of the U3; the collector output end of the U3 is connected with the first pin of the R11, and the second pin of the R11 is connected with a 5V power supply; the output end of the emitter of the U3 is connected with the anode of the D7, and the cathode of the D7 is grounded.

8. The power distribution equipment of claim 6 wherein the voltage divider unit divides the high voltage collected by the high voltage supply circuit output by R5, RP1 and R10 to a fraction 132 of the voltage to provide the comparator U2A as the detection voltage.

9. The power distribution equipment according to claim 6, wherein the comparison unit divides the voltage by R1 and R4 resistors to reduce the voltage of 5V to 2.5V, and sends the voltage to a comparator U2A as a reference voltage; when the detection voltage of the negative input pin is more than 2.5V, namely the actual output of the high-voltage power supply circuit is more than 330V, the U2A outputs low voltage to drive the chip U1 to work; when the detection voltage of the negative input pin is less than 2.5V, namely the actual output of the high-voltage power supply circuit is less than 330V, the U2A outputs high voltage, and the driving chip U1 does not work at the moment.

10. The electrical distribution apparatus of claim 7, wherein the power switching unit drives the IGBT V7 with M57962L, and with M57962L with dual power supply, with a positive voltage of 15V and a negative voltage of-10V; when 5V voltage exists between the fourteenth pin and the thirteenth pin, the fifth pin outputs +15V voltage to drive the IGBT tube V7 to be switched on, and when 0V voltage exists between the fourteenth pin and the thirteenth pin, the fifth pin outputs-10V voltage, and the IGBT tube V7 is cut off.

Technical Field

The invention relates to a ground test launch control system of a carrier rocket, in particular to high-voltage energy consumption braking power distribution equipment of an electric servo mechanism.

Background

At present, most newly-developed carrier rockets begin to use electric servo mechanisms, and the internal structures of the electric servo mechanisms are permanent magnet synchronous servo motors. Generally speaking, a power distribution circuit of a permanent magnet synchronous servo motor comprises a power supply, a soft start circuit, a filter circuit and an energy consumption braking circuit. When the motor is braked and operated, the stored energy of the motor inductor and the kinetic energy of the rotor need to be fed back to the direct current side in an electric energy form to charge the capacitor C, so that the voltage of a direct current side bus is rapidly increased, and if the voltage of the direct current side bus is excessively increased, the switch device in a power loop and the capacitor C are damaged. Therefore, an energy consumption braking circuit is required to be designed in the power distribution circuit to prevent the voltage of the direct-current side bus from rising too high when the motor is braked and operated.

In addition, due to the existence of the capacitor C and other large-capacity capacitors, when the system is powered on and started, a large surge impact current can be generated to the system, so that the soft start circuit also needs to be considered for protection during system design, and the impact of the start current on products on arrows is relieved.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention discloses electric servo mechanism high-voltage energy consumption braking power distribution equipment, which adopts the following technical scheme:

the utility model provides an electric servo high pressure dynamic braking distribution equipment, includes filter circuit, filter circuit includes electric capacity C, its characterized in that, distribution equipment still includes: the system comprises a high-voltage power supply circuit, a soft start circuit, an energy consumption braking circuit and an energy consumption braking control circuit; wherein:

the high-voltage power supply circuit is used for supplying voltage to the electric servo mechanism;

the soft start circuit is respectively connected with the high-voltage power supply circuit and the filter circuit and is used for reducing the starting instantaneous current;

the energy consumption braking circuit is connected with the filter circuit and is used for inhibiting the impact of reverse voltage of the motor on the bus and reducing the voltage of the bus on the direct current side;

and the energy consumption braking control circuit is connected with the energy consumption braking circuit and is used for triggering the energy consumption braking circuit to realize the function of reducing the voltage of the direct-current side bus.

Optionally, the high voltage supply circuit comprises: the system comprises a 380V alternating current power supply, a three-phase power frequency rectifying circuit and an input filter circuit; the 380V alternating current power supply is rectified by the three-phase power frequency rectifying circuit to form pulsating direct current voltage, and the pulsating direct current voltage is rectified by the input filter circuit to generate stable direct current voltage.

Optionally, the soft start circuit includes: current limiting resistors R14 and R16, a capacitor C15 and a field effect transistor V8; the gate of the V8 is connected with one end of the C15; the R16 is connected in series with R14; the C15 is connected in parallel with R14.

Optionally, the dynamic braking circuit comprises: brake resistor R15, IGBT tube V7; one end of R15 is connected to the collector of V7; the other end of the R15 is connected with the anode of the capacitor C; the emitter of the V7 is connected with the cathode of the capacitor C; a diode is connected between the collector and emitter of V7.

Optionally, the dynamic braking control circuit includes a voltage dividing unit, a comparing unit and a power switching unit; wherein:

the voltage dividing unit provides a measured voltage and a reference voltage for the comparison unit;

if the measured voltage is greater than the reference voltage, the comparison unit drives the power switch unit, and the power switch unit drives the energy consumption braking circuit to work;

if the measured voltage is less than the reference voltage, the comparison unit does not drive the power switch unit, and the energy consumption braking circuit does not work.

Optionally, the voltage dividing unit further includes: the circuit comprises a resistor R1, a resistor R4, a resistor R5, a resistor R7, a resistor R10, a potentiometer RP1, a capacitor C1, a capacitor C3 and a transient suppression diode D5;

the comparison unit includes: the circuit comprises a comparator U2A, a capacitor C2, a resistor R8, a light-emitting diode D1, a resistor R3 and a resistor R2;

a first pin of the resistor R5 is connected with a positive electrode of a capacitor C, a second pin of the resistor R5 is connected with a first pin of a potentiometer RP1, a second pin of the potentiometer RP1 is connected with a first pin of a resistor R10, a middle pin of the potentiometer RP1 is respectively connected with a first pin of a capacitor C3, a first pin of a resistor R10, a negative electrode of a transient suppression diode D5 and a first pin of a resistor R7, a second pin of the resistor R10 is connected with a negative electrode of the capacitor C, a second pin of the resistor R10, a second pin of the capacitor C3 and a positive electrode of the transient suppression diode are all grounded, and a second pin of the resistor R7 is connected with a negative input pin of a comparator U2A;

a first pin of the resistor R1 is connected with a 5V power supply, a second pin of the resistor R1 is respectively connected with a first pin of a ground resistor R4, a first pin of a capacitor C1, a first pin of the resistor R2 and a positive input pin of the comparator U2A, and a second pin of the capacitor C1 and a second pin of the resistor R4 are both grounded;

a second pin of the resistor R2 is respectively connected with a cathode of the light-emitting diode D1, an output pin of the comparator U2A and a first pin of the resistor R8, an anode of the light-emitting diode D1 is connected with a first pin of the resistor R3, and a second pin of the resistor R3 is connected with a 5V power supply; the positive side power supply pin of the comparator U2A is respectively connected with the first pin of the capacitor C2 and the 5V power supply, the second pin of the capacitor C2 is grounded, and the negative side power supply pin of the comparator U2A is grounded.

Optionally, the power switching unit further includes: the driving circuit comprises a driving chip U1, a resistor R6, a resistor R9, a resistor R11, a resistor R12, a transient suppression diode D2, a diode D3, a transient suppression diode D4, a transient suppression diode D6, a light emitting diode D7 and an optical coupler U3; wherein, U1 is a driving chip M57962L;

a fourth pin of the U1 is connected with a 24V power supply, and a fourteenth pin is connected with a 5V power supply; a first pin of the U1 is connected with the negative electrode of the D2, the positive electrode of the D2 is connected with the positive electrode of the D3, and the positive electrode of the D3 is connected with the collector electrode of the IGBT tube V7;

the thirteenth pin of U1 is connected to the second pin of R8; a fifth pin of the U1 is connected with a first pin of the R6, and a second pin of the R6 is respectively connected with the first pin of the R9, the cathode of the D4 and the gate of the IGBT tube V7; the positive electrode of D4 is connected with the positive electrode of D6, and the negative electrode of D6 is respectively connected with the second pin of R9 and the emitter of the IGBT tube V7; the eighth pin of the U1 is connected with the first pin of the R12, and the second pin of the R12 is connected with the negative input end of the U3; the collector output end of the U3 is connected with the first pin of the R11, and the second pin of the R11 is connected with a 5V power supply; the output end of the emitter of the U3 is connected with the anode of the D7, and the cathode of the D7 is grounded.

Optionally, the voltage dividing unit reduces the voltage of the high voltage collected by the output of the high voltage power supply circuit to 132 times of the voltage thereof through R5, RP1 and R10, and provides the comparator U2A with the voltage as a detection voltage.

Optionally, the comparison unit divides the voltage by resistors R1 and R4, reduces the voltage of 5V to 2.5V, and sends the voltage to a comparator U2A as a reference voltage; when the detection voltage of the negative input pin is more than 2.5V, namely the actual output of the high-voltage power supply circuit is more than 330V, the U2A outputs low voltage to drive the chip U1 to work; when the detection voltage of the negative input pin is less than 2.5V, namely the actual output of the high-voltage power supply circuit is less than 330V, the U2A outputs high voltage, and the driving chip U1 does not work at the moment.

Optionally, the power switch unit drives the IGBT tube V7 by using M57962L, and the M57962L is powered by using dual power supplies, with a positive voltage of 15V and a negative voltage of-10V; when 5V voltage exists between the fourteenth pin and the thirteenth pin, the fifth pin outputs +15V voltage to drive the IGBT tube V7 to be switched on, and when 0V voltage exists between the fourteenth pin and the thirteenth pin, the fifth pin outputs-10V voltage, and the IGBT tube V7 is cut off.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention realizes the power distribution requirement of the high-voltage electric servo mechanism of the carrying system through the energy consumption braking circuit and the soft start circuit.

2. The invention can meet the power distribution requirements of electric servomechanisms with different voltage specifications.

3. The invention can not only prevent the starting current of the motor from being overhigh, but also inhibit the situation that the voltage of the direct-current side bus is overhigh when the motor is braked and operated, and plays a role in protecting a power main circuit and a control circuit in the rocket servo controller.

Drawings

FIG. 1 is a schematic circuit diagram of an electric servo high-voltage dynamic braking power distribution apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic circuit diagram of a dynamic braking control circuit according to an embodiment of the present invention;

description of reference numerals:

1: a high voltage power supply circuit; 2: a soft start circuit; 31: a filter circuit; 32: an energy consumption braking circuit; 4: an energy consumption brake control circuit; 5: a voltage dividing unit; 6: a comparison unit; 7: a power switch unit.

Detailed Description

The present invention will be described in more detail below with reference to the accompanying drawings, which illustrate embodiments of the invention. This invention may, however, be embodied in different forms, specifications, and the like and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, relative dimensions may be exaggerated or minimized for clarity.

As shown in fig. 1, the embodiment discloses an electric servo mechanism high-voltage dynamic braking power distribution device, which includes a filter circuit 31, a high-voltage power supply circuit 1, a soft start circuit 2, a dynamic braking circuit 32, a dynamic braking control circuit 4, and a DC/AC power inverter circuit; the filter circuit 31 includes a capacitor C; wherein:

the high-voltage power supply circuit is used for supplying voltage to the electric servo mechanism; in this embodiment, the high voltage power supply circuit mainly generates 270V voltage for the operation of the servo mechanism;

the soft start circuit is respectively connected with the high-voltage power supply circuit and the filter circuit and is used for reducing the starting instantaneous current; the soft start circuit realizes the current limiting function through the current limiting resistor and the contactor, and realizes the reduction of the starting instantaneous current.

The energy consumption braking circuit is connected with the filter circuit and is used for inhibiting the impact of reverse voltage of the motor on the bus, reducing the voltage of the bus on the direct current side and protecting the power main circuit and the control circuit;

and the energy consumption braking control circuit is connected with the energy consumption braking circuit and is used for triggering the energy consumption braking circuit to realize the function of reducing the voltage of the direct-current side bus. The dynamic braking control circuit realizes the automatic triggering of the dynamic braking function according to the preset overvoltage value.

Wherein, the high voltage power supply circuit includes: the system comprises a 380V alternating current power supply, a three-phase power frequency rectifying circuit, an input filter circuit and a K2 contactor; the input filter circuit comprises capacitors C11 and C12 which are connected in series and then connected in parallel at two ends of the three-phase power frequency rectifying circuit; k2 is connected in series at one end of the three-phase power frequency rectifying circuit. In this embodiment, the three-phase power frequency rectification circuit is a three-phase bridge full-control rectification circuit and is composed of six thyristors.

The 380V alternating current power supply forms pulsating direct current voltage through three-phase power frequency rectification, the pulsating direct current voltage is rectified through the input filter circuit to generate stable 270V direct current voltage, and the 270V direct current voltage is converted into alternating current voltage which can be used by the PMSM through the soft start circuit and the DC/AC power inverter circuit. PMSM is known as permanent magnet synchronous motor, i.e. permanent magnet synchronous motor.

Wherein the soft start circuit comprises: current limiting resistors R14 and R16, a capacitor C15 and a field effect transistor V8; the gate of the V8 is connected with one end of the C15; the R16 is connected in series with R14; the C15 is connected in parallel with R14. When the power distribution equipment is started, the capacitor C15 is charged through the resistor R16 to generate charging current, high voltage (10-15V) is formed on the R16, the field-effect tube V8 is not conducted, and along with the reduction of the charging current, when the voltage on the R16 is low to a certain degree (below 1V), the grid voltage of the field-effect tube V8 is reduced, so that the V8 is switched on, the energy consumption of a circuit is reduced, and the process of slow starting is completed.

The on-off time of the V8 can be automatically controlled by the embedded chip, and the reasonable resistance values of the current limiting resistors R14 and R16 can be calculated according to the load capacitors on the arrows.

Wherein the dynamic braking circuit comprises: brake resistor R15, IGBT tube V7; one end of R15 is connected to the collector of V7; the other end of the R15 is connected with the anode of the capacitor C; the emitter of the V7 is connected with the cathode of the capacitor C; a diode is connected between the collector and emitter of V7.

The capacitor C is connected with two ends of the high-voltage output bus and used as a filter capacitor of a load, so that the output voltage is kept stable; the capacitor outputs a dc voltage of 270V across it.

When the voltage of the direct current side rises to a set peak value, the control V7 is switched on, the capacitor C and the motor inductance energy storage are discharged through the brake resistor R15, the voltage of a direct current side bus is reduced, and a power main circuit and a control circuit are protected.

As shown in fig. 2, the dynamic braking control circuit includes a voltage dividing unit, a comparing unit, and a power switching unit; wherein:

the voltage dividing unit provides a measured voltage and a reference voltage for the comparison unit;

if the measured voltage is greater than the reference voltage, the comparison unit outputs a low voltage (0V) to drive the power switch unit, and the power switch unit drives the energy consumption braking circuit to work;

if the measured voltage is less than the reference voltage, the comparison unit outputs high voltage (5V), the comparison unit does not drive the power switch unit, the power switch unit does not work, and the energy consumption braking circuit does not work.

Wherein, the voltage division unit further comprises: the circuit comprises a resistor R1, a resistor R4, a resistor R5, a resistor R7, a resistor R10, a potentiometer RP1, a capacitor C1, a capacitor C3 and a transient suppression diode D5;

the comparison unit includes: the circuit comprises a comparator U2A, a capacitor C2, a resistor R8, a light-emitting diode D1, a resistor R3 and a resistor R2;

a first pin of the resistor R5 is connected to an anode of a capacitor C (i.e., an anode of 270V dc voltage), a second pin of the resistor R5 is connected to a first pin of the potentiometer RP1, a second pin of the potentiometer RP1 is connected to a first pin of the resistor R10, a middle pin of the potentiometer RP1 is connected to a first pin of the capacitor C3, a first pin of the resistor R10, a cathode of the transient suppression diode D5, and a first pin of the resistor R7, a second pin of the resistor R10 is connected to a cathode of the capacitor C, a second pin of the resistor R10, a second pin of the capacitor C3, and an anode of the transient suppression diode are all grounded, and a second pin of the resistor R7 is connected to a negative input pin of the comparator U2A;

a first pin of the resistor R1 is connected with a 5V power supply, a second pin of the resistor R1 is respectively connected with a first pin of a ground resistor R4, a first pin of a capacitor C1, a first pin of the resistor R2 and a positive input pin of the comparator U2A, and a second pin of the capacitor C1 and a second pin of the resistor R4 are both grounded;

a second pin of the resistor R2 is respectively connected with a cathode of the light-emitting diode D1, an output pin of the comparator U2A and a first pin of the resistor R8, an anode of the light-emitting diode D1 is connected with a first pin of the resistor R3, and a second pin of the resistor R3 is connected with a 5V power supply; the positive side power supply pin of the comparator U2A is respectively connected with the first pin of the capacitor C2 and the 5V power supply, the second pin of the capacitor C2 is grounded, and the negative side power supply pin of the comparator U2A is grounded.

Wherein the power switching unit further includes: the driving circuit comprises a driving chip U1, a resistor R6, a resistor R9, a resistor R11, a resistor R12, a transient suppression diode D2, a diode D3, a transient suppression diode D4, a transient suppression diode D6, a light emitting diode D7 and an optical coupler U3; wherein, U1 is a driving chip M57962L;

a fourth pin of the U1 is connected with a 24V power supply, and a fourteenth pin is connected with a 5V power supply; a first pin of the U1 is connected with the negative electrode of the D2, the positive electrode of the D2 is connected with the positive electrode of the D3, and the positive electrode of the D3 is connected with the collector electrode of the IGBT tube V7;

the thirteenth pin of U1 is connected to the second pin of R8; a fifth pin of the U1 is connected with a first pin of the R6, and a second pin of the R6 is respectively connected with the first pin of the R9, the cathode of the D4 and the gate of the IGBT tube V7; the positive electrode of D4 is connected with the positive electrode of D6, and the negative electrode of D6 is respectively connected with the second pin of R9 and the emitter of the IGBT tube V7; the eighth pin of the U1 is connected with the first pin of the R12, and the second pin of the R12 is connected with the negative input end of the U3; the collector output end of the U3 is connected with the first pin of the R11, and the second pin of the R11 is connected with a 5V power supply; the output end of the emitter of the U3 is connected with the anode of the D7, and the cathode of the D7 is grounded.

The voltage dividing unit divides the 270V high voltage collected by the output of the high-voltage power supply circuit through R5, RP1 and R10 to be reduced to one 132 times of the high voltage (namely one 132 times of the 270V), and the high voltage is supplied to the comparator U2A to be used as detection voltage.

In the embodiment, the comparison unit divides the voltage by resistors R1 and R4, reduces the voltage of 5V to 2.5V, and sends the voltage to a comparator U2A as a reference voltage; when the detection voltage of the negative input pin is more than 2.5V, namely the actual output of the high-voltage power supply circuit is more than 330V, the U2A outputs low voltage to drive the chip U1 to work; when the detection voltage of the negative input pin is less than 2.5V, namely the actual output of the high-voltage power supply circuit is less than 330V, the U2A outputs high voltage, and the driving chip U1 does not work at the moment.

In the embodiment, the power switch unit adopts M57962L to drive the IGBT tube V7, and M57962L adopts a dual-power supply mode, wherein the positive voltage is 15V, and the negative voltage is-10V; when 5V voltage exists between the fourteenth pin and the thirteenth pin, the fifth pin outputs +15V voltage to drive the IGBT tube V7 to be switched on, and when 0V voltage exists between the fourteenth pin and the thirteenth pin, the fifth pin outputs-10V voltage, and the IGBT tube V7 is cut off.

The dynamic braking control circuit further comprises an auxiliary circuit, the auxiliary circuit comprising: resistors R13, C4, D8; the first end of R13 is connected to 24V; the second end of the R13 is respectively connected with the negative electrode of the D8 and the positive electrode of the C4; the positive electrode of the D8 and the positive electrode of the C4 are connected with the sixth pin of the U1. The auxiliary circuit is used for providing a voltage of-10V for U1.

By the dynamic braking control circuit, the bus voltage of the electric servo mechanism during working can be monitored in real time, once the bus voltage exceeds a set value, the dynamic braking function is quickly started, and a power main circuit and a control circuit in a servo controller are effectively protected.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection determined by the claims.