CN218829082U - Servo overcurrent protection circuit - Google Patents
Servo overcurrent protection circuit Download PDFInfo
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- CN218829082U CN218829082U CN202223425156.3U CN202223425156U CN218829082U CN 218829082 U CN218829082 U CN 218829082U CN 202223425156 U CN202223425156 U CN 202223425156U CN 218829082 U CN218829082 U CN 218829082U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The application discloses servo overcurrent protection circuit includes: the input end of the servo inversion module is electrically connected with a high-voltage power supply, the servo inversion module is electrically connected with a motor, and the servo inversion module is used for inverting direct current into alternating current so as to supply the motor to work; the input end of the signal amplification module is electrically connected to the output end of the servo inversion module, and the signal amplification module is used for amplifying and outputting the voltage signal output by the servo inversion module; the input end of the detection comparison module is electrically connected with the output end of the signal amplification module, the detection comparison module is electrically connected with the protection part, and the detection comparison module is used for comparing the voltage signals and controlling the connection and conduction between the signal amplification module and the protection part. The three-phase overcurrent detection circuit has the advantages that the isolation precision amplifier adopted by the existing three-phase overcurrent detection circuit is effectively reduced, the cost of hardware is high, and the effect of the condition that the cost of the hardware is high is achieved.
Description
Technical Field
The application relates to the technical field of servo protection, in particular to a servo overcurrent protection circuit.
Background
Servo systems, also known as servo systems, are feedback control systems used to accurately follow or replicate a process. The servo system is an automatic control system which can make the output controlled quantity of the position, the direction, the state and the like of an object follow the arbitrary change of an input target (or a given value). The servo system mainly comprises a servo motor and a servo driver for controlling the servo motor, and three-phase alternating current voltages (U phase, V phase and W phase) output by the servo driver are used for driving the motor to rotate. When the motor is internally insulated and aged, if a certain phase in the UVW three-phase winding is short-circuited with the PE of the motor shell, the servo driver is required to detect the abnormality in time, and the output high voltage is cut off so as to ensure that the servo driver body is not damaged. Based on the above abnormal situation, a general servo driver is generally provided with a three-phase overcurrent detection circuit.
In the related technology, the servo driver only collects any two-phase current in three phases to perform software closed-loop calculation. As shown in fig. 1, taking W-phase current detection as an example, the resistors R11/R12/R13 are high-precision sampling resistors, weak voltages at two ends of the resistor R13 are isolated and amplified by an isolated precision amplifier, and voltages output by the isolated precision amplifier are amplified proportionally by a comparator to output an analog voltage IW. When the IW current exceeds the threshold value of the comparator, the output interface FO can be reversely turned to an abnormal level state, and the MCU immediately stops the motor operation after monitoring the abnormal level of the output interface FO and alarms the overcurrent fault. Since the servo software calculates that two phases of current are required, two phases of three-phase over-current detection circuits as shown in fig. 1 are typically calibrated in the servo driver.
In order to deal with the phenomenon that the insulation of the motor is reduced to cause short circuit of a winding and a machine shell, a three-phase over-current detection circuit is generally added to a third phase. However, the isolation precision amplifier adopted by the existing three-phase over-current detection circuit is high in price, and the hardware cost required for realizing the circuit is high.
SUMMERY OF THE UTILITY MODEL
In order to improve the isolation precision amplifier that current three-phase overcurrent detection circuit adopted and have a high price, realize the higher drawback of required hardware cost, this application provides a servo overcurrent protection circuit.
The application provides a servo overcurrent protection circuit adopts following technical scheme:
a servo overcurrent protection circuit, comprising:
the servo inversion module is electrically connected with a motor and used for inverting direct current input by the high-voltage power supply into alternating current for the motor to work;
the input end of the signal amplification module is electrically connected to the output end of the servo inversion module, and the signal amplification module is used for amplifying and outputting a voltage signal of a high-precision sampling resistor on any phase in the servo inversion module;
the detection and comparison module is electrically connected with the input end of the signal amplification module and the output end of the signal amplification module, the detection and comparison module is electrically connected with the protection part and used for comparing the voltage signals amplified by the signal amplification module and controlling the connection and conduction between the signal amplification module and the protection part.
By adopting the technical scheme, when the circuit is over-current, the voltage signal in the servo inversion module is amplified and then output to the detection comparison module through the arrangement of the signal amplification module, and the voltage signal amplified by the signal amplification module is compared, so that the protection part is conducted. At the moment, the MCU monitors the abnormal state of the output interface FO, immediately stops the servo driver from outputting high voltage, and alarms overcurrent faults, so that an isolation precision amplifier is not needed, and the overcurrent protection effect is achieved, thereby effectively reducing the condition that the cost of the isolation precision amplifier adopted by the existing three-phase overcurrent detection circuit is higher, and the hardware cost required for realizing the circuit is higher.
Preferably, the detection comparison module includes a comparison unit for comparing the voltage signal output by the signal amplification module and an on-off unit for controlling the connection and conduction between the comparison unit and the protection portion, an input end of the comparison unit is electrically connected to an output end of the signal amplification module, an output end of the comparison unit is electrically connected to an input end of the on-off unit, and an output end of the on-off unit is electrically connected to an input end of the protection portion.
By adopting the technical scheme, when the detection comparison module starts working, the voltage signal amplified by the signal amplification module is output to the opening and closing unit through the comparison unit, and the connection and conduction between the comparison unit and the protection part are controlled through the opening and closing unit, so that the protection part is conducted, the MCU monitors the abnormal state of the output interface FO, immediately stops the servo driver from outputting high voltage, and alarms overcurrent faults.
Preferably, the comparing unit includes a first voltage detecting chip and a second voltage detecting chip connected in series, the non-inverting input terminal of the first voltage detecting chip is electrically connected to the inverting input terminal of the second voltage detecting chip, and the output terminal of the signal amplifying module is electrically connected to the non-inverting input terminal of the first voltage detecting chip and the inverting input terminal of the second voltage detecting chip.
By adopting the technical scheme, when the circuit is over-current, if the over-current occurs in the forward direction, the voltage of the non-inverting input end of the first voltage detection chip is smaller than that of the inverting input end, and the output end of the first voltage detection chip outputs a low level. If the reverse overcurrent occurs, the voltage of the reverse phase input end of the second voltage detection chip is greater than the voltage of the non-phase input end, and the output end of the second voltage detection chip outputs a low level.
Preferably, the inverting input terminal of the first voltage detection chip is electrically connected to the reference portion, the input terminal of the reference portion is electrically connected to the inverting input terminal of the first voltage detection chip, and the output terminal of the reference portion is grounded.
By adopting the technical scheme, the reference voltage is provided for the first voltage detection chip and the second voltage detection chip.
Preferably, the on-off unit includes a first triode and a second triode connected in series, bases of the first triode and the second triode are electrically connected to the output end of the comparison unit, an emitter of the first triode is electrically connected to an emitter of the second triode, a collector of the first triode is electrically connected to an external power supply, and a collector of the second triode is electrically connected to a reference ground.
Through adopting above-mentioned technical scheme, when the circuit appears overflowing, first voltage detection chip carries out the comparison to the voltage of signal amplification chip output and the reference voltage that reference portion provided, if when the forward overflow appears, the voltage of the homophase input end of first voltage detection chip is less than the voltage of inverting input end, the output low level of first voltage detection chip, first triode does not switch on, and the second triode switches on for the protection part switches on. At the moment, the MCU monitors the abnormal state of the output interface FO, immediately stops the servo driver from outputting high voltage, and alarms overcurrent faults, so that the effect of overcurrent protection is achieved without isolating a precise amplifier.
Preferably, the protection portion includes an isolation optocoupler, an anode end of the isolation optocoupler is electrically connected to an external power supply, a cathode end of the isolation optocoupler is electrically connected between an emitter of the first triode and an emitter of the second triode, a collector electrode of the isolation optocoupler is electrically connected to the output interface FO, and the emitter of the isolation optocoupler is grounded.
By adopting the technical scheme, when the second triode is conducted, the output end of the first voltage detection chip outputs the low level, so that the isolation optocoupler low level is conducted, the MCU monitors the abnormal state of the output interface FO at the moment, the servo driver is immediately stopped to output the high voltage, and the overcurrent fault is alarmed.
Preferably, the signal amplification module includes a signal amplification chip and a peripheral standard circuit of the signal amplification chip, the inverting input terminal and the non-inverting input terminal of the signal amplification chip are electrically connected to two ends of the high-precision sampling resistor, respectively, and the output terminal of the signal amplification chip is electrically connected to the input terminal of the comparison unit.
By adopting the technical scheme, when the signal amplification module starts to work, the high-precision sampling resistor in the servo inversion module outputs a voltage signal to the signal amplification chip U1, the signal amplification chip performs high-gain and low-noise amplification on the voltage signals at two ends of the high-precision sampling resistor, and outputs the conditioned and amplified voltage signal to the detection comparison module.
Preferably, a voltage stabilizing part is arranged between the signal amplifying module and the detection comparing module, an input end of the voltage stabilizing part is electrically connected to an output end of the signal amplifying module, and an output end of the voltage stabilizing part is electrically connected to an input end of the comparing unit.
By adopting the technical scheme, the voltage signal output by the signal amplification module is stably output to the detection comparison module.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the voltage signal in the servo inversion module is amplified by the signal amplification module and then output to the detection comparison module, and the voltage signal amplified by the signal amplification module is compared, so that the protection part is conducted, and the condition that the cost of an isolation precision amplifier adopted by the existing three-phase overcurrent detection circuit is high and the hardware cost required for realizing the condition is high is effectively reduced;
2. the voltage stabilizing part is arranged between the signal amplification module and the detection comparison module, so that the voltage signal output by the signal amplification module is stably output to the detection comparison module.
Drawings
Fig. 1 is a circuit diagram of the prior art.
Fig. 2 is a schematic diagram of the overall circuit structure of the embodiment of the present application.
Fig. 3 is a schematic circuit diagram of a detection and comparison module in an embodiment of the present application.
Description of reference numerals:
1. a servo inversion module; 2. a signal amplification module; 3. a detection comparison module; 31. a comparison unit; 32. an opening and closing unit; 33. a reference part; 4. a voltage stabilizing part; 5. a protection part.
Detailed Description
The present application is described in further detail below with reference to figures 2-3.
Referring to fig. 2 and 3, the servo overcurrent protection circuit disclosed in the present application includes a servo inverter module 1, a signal amplification module 2, and a detection comparison module 3. The input end of the servo inversion module 1 is electrically connected to the N end and the P end of the high-voltage power supply, the servo inversion module 1 is also electrically connected to a motor, and the servo inversion module 1 is used for inverting direct current input by the high-voltage power supply into alternating current to supply the motor to work. The signal amplification module 2 is electrically connected with the servo inversion module 1, and is used for amplifying a voltage signal of a high-precision sampling resistor on any phase in the servo inversion module 1 and outputting the amplified voltage signal to the detection comparison module 3. The detection comparison module 3 is electrically connected with the signal amplification module 2 and is used for comparing the voltage signal amplified by the signal amplification module 2. In this embodiment, the signal amplification module 2 is electrically connected to the W phase of the servo inverter module 1, and the input end of the signal amplification module 2 is electrically connected to the W phase high-precision sampling resistor R3.
Specifically, the signal amplification module 2 includes a signal amplification chip U1 and a peripheral standard circuit of the signal amplification chip U1, and the signal amplification chip U1 is an operational amplifier. The inverting input end and the non-inverting input end of the signal amplification chip U1 are respectively and electrically connected to two ends of the W-phase high-precision sampling resistor R3, and the output end of the signal amplification chip U1 is electrically connected to the input end of the detection comparison module 3. When the signal amplification module 2 starts to work, the W-phase high-precision sampling resistor R3 outputs a voltage signal to the signal amplification chip U1, and the signal amplification chip U1 performs high-gain and low-noise amplification on the voltage signal at the two ends of the high-precision sampling resistor R3, and outputs the conditioned and amplified voltage signal to the detection comparison module 3.
Referring to fig. 2 and 3, a voltage stabilizing part 4 is further disposed between the signal amplifying module 2 and the detection comparing module 3, wherein the voltage stabilizing part 4 is a voltage stabilizing tube D1, cathodes of the voltage stabilizing tube D1 are electrically connected to the signal amplifying module 2 and the detection comparing module 3, and an anode of the voltage stabilizing tube D1 is electrically connected to a reference ground W _0V, so that the voltage signal output by the signal amplifying module 2 is stably output to the detection comparing module 3.
The detection and comparison module 3 includes a comparison unit 31 and an on-off unit 32 electrically connected to the comparison unit 31, an input end of the comparison unit 31 is electrically connected to an output end of the signal amplification chip U1, an output end of the comparison unit 31 is electrically connected to an input end of the on-off unit 32, and an output end of the on-off unit 32 is electrically connected to the protection portion 5. The comparing unit 31 is used for comparing the voltage signal output by the signal amplifying module 2, and the on-off unit 32 is used for controlling the connection and conduction between the comparing unit 31 and the protection part 5.
Referring to fig. 2 and 3, in particular, the comparing unit 31 mainly includes a first voltage detecting chip U2 and a second voltage detecting chip U3 connected in series, and the first voltage detecting chip U2 and the second voltage detecting chip U3 are voltage comparators. The first voltage detection chip U2 is used for detecting voltage signals when the circuit is subjected to forward overcurrent, the second voltage detection chip U3 is used for detecting the voltage signals when the circuit is subjected to reverse overcurrent, and the first voltage detection chip U2 and the second voltage detection chip U3 respectively fix two threshold points of voltage thresholds when overcurrent occurs. The non-inverting input terminal of the first voltage detecting chip U2 is electrically connected to the inverting input terminal of the second voltage detecting chip U3, and the output terminal of the signal amplifying chip U1 is electrically connected to the non-inverting input terminal of the first voltage detecting chip U2 and the inverting input terminal of the second voltage detecting chip U3. The inverting input terminal of the first voltage detecting chip U2 is electrically connected to a reference portion 33 for providing a reference voltage, the input terminal of the reference portion 33 is electrically connected to the inverting input terminal of the first voltage detecting chip U2, and the output terminal of the reference portion 33 is grounded. The reference portion 33 includes a resistor R13 and a resistor R14 connected in series, and the non-inverting input terminal of the second voltage detecting chip U3 is electrically connected between the resistor R13 and the resistor R14. When the circuit is over-current, the first voltage detection chip U2 compares the voltage output by the signal amplification chip U1 with the reference voltage provided by the reference portion 33, if a forward over-current occurs, the voltage at the non-inverting input terminal of the first voltage detection chip U2 is less than the voltage at the inverting input terminal, and the output terminal of the first voltage detection chip U2 outputs a low level. If the reverse overcurrent occurs, the voltage at the inverting input end of the second voltage detection chip U3 is greater than the voltage at the non-inverting input end, and the output end of the second voltage detection chip U3 outputs a low level.
Referring to fig. 2 and 3, in particular, the on-off unit 32 includes a first triode Q1 and a second triode Q2 connected in series, where the first triode Q1 is an NPN-type triode and the second triode Q2 is a PNP-type triode. Bases of the first triode Q1 and the second triode Q2 are electrically connected to an output end of the comparing unit 31, an emitter of the first triode Q1 is electrically connected to an emitter of the second triode Q2, a collector of the first triode Q1 is electrically connected to the +24V power supply, and a collector of the second triode Q2 is electrically connected to the reference ground W1. Protection part 5 is including keeping apart opto-coupler U4, keep apart opto-coupler U4's positive pole end electric connection in +24V power, keep apart opto-coupler U4 and switch on for the low level, keep apart opto-coupler U4's negative pole end electric connection between first triode Q1's projecting pole and second triode Q2's projecting pole, keep apart opto-coupler U4's power end electric connection in +5V power, keep apart opto-coupler U4's collecting electrode electric connection in output interface FO, keep apart opto-coupler U4's projecting pole ground connection. In this embodiment, the output interface FO is electrically connected to the MCU for monitoring the state of the output interface FO. When the circuit appears overflowing, the first voltage detection chip U2 compares the voltage output by the signal amplification chip U1 with the reference voltage provided by the reference part 33, if forward overflowing appears, the voltage of the in-phase input end of the first voltage detection chip U2 is smaller than the voltage of the reverse-phase input end, the output end of the first voltage detection chip U2 outputs a low level, the first triode Q1 is not conducted, the second triode Q2 is conducted, and the isolation optocoupler U4 is conducted. At the moment, the MCU monitors the abnormal state of the output interface FO, immediately stops the servo driver from outputting high voltage, and alarms overcurrent faults, so that the effect of overcurrent protection is achieved without isolating a precise amplifier.
The implementation principle of the embodiment of the application is as follows: when the circuit is over-current, the voltage signal in the servo inverter module 1 is amplified and then output to the detection comparison module 3 through the arrangement of the signal amplification module 2, and the voltage signal amplified by the signal amplification module 2 is compared, so that the protection part 5 is conducted. At the moment, the MCU monitors the abnormal state of the output interface FO, immediately stops the servo driver from outputting high voltage, and alarms overcurrent faults, so that an isolation precision amplifier is not needed, the overcurrent protection effect is achieved, and the condition that the cost of the isolation precision amplifier adopted by the existing three-phase overcurrent detection circuit is high and the hardware cost required for realizing the circuit is high is effectively reduced.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A servo overcurrent protection circuit, comprising:
the servo inversion module (1) is used for inverting direct current input by the high-voltage power supply into alternating current so as to enable the motor to work;
the input end of the signal amplification module (2) is electrically connected to the output end of the servo inversion module (1), and the signal amplification module (2) is used for amplifying and outputting a voltage signal of a high-precision sampling resistor on any phase of the servo inversion module (1);
the detection and comparison module (3), the input electric connection that detects comparison module (3) in the output of signal amplification module (2), it has protection portion (5) to detect comparison module (3) electric connection, it is used for with to detect comparison module (3) the voltage signal after signal amplification module (2) enlargies contrasts, and control signal amplification module (2) with connect between protection portion (5) and switch on.
2. The servo overcurrent protection circuit of claim 1, wherein: the detection and comparison module (3) comprises a comparison unit (31) for comparing voltage signals output by the signal amplification module (2) and an opening and closing unit (32) for controlling the comparison unit (31) and conducting connection between the protection parts (5), wherein the input end of the comparison unit (31) is electrically connected with the output end of the signal amplification module (2), the output end of the comparison unit (31) is electrically connected with the input end of the opening and closing unit (32), and the output end of the opening and closing unit (32) is electrically connected with the input end of the protection part (5).
3. The servo overcurrent protection circuit of claim 2, wherein: the comparison unit (31) comprises a first voltage detection chip and a second voltage detection chip which are connected in series, the in-phase input end of the first voltage detection chip is electrically connected with the reverse phase input end of the second voltage detection chip, and the output end of the signal amplification module (2) is electrically connected with the in-phase input end of the first voltage detection chip and the reverse phase input end of the second voltage detection chip.
4. The servo overcurrent protection circuit of claim 3, wherein: the inverting input end of the first voltage detection chip is electrically connected with a reference portion (33), the input end of the reference portion (33) is electrically connected with the inverting input end of the first voltage detection chip, and the output end of the reference portion (33) is grounded.
5. A servo overcurrent protection circuit according to claim 3, characterized in that: the on-off unit (32) comprises a first triode and a second triode which are connected in series, the base electrodes of the first triode and the second triode are electrically connected to the output end of the comparison unit (31), the emitting electrode of the first triode is electrically connected to the emitting electrode of the second triode, the collecting electrode of the first triode is electrically connected to an external power supply, and the collecting electrode of the second triode is electrically connected to a reference ground.
6. The servo overcurrent protection circuit of claim 5, wherein: the protection part (5) comprises an isolation optocoupler, wherein an anode end of the isolation optocoupler is electrically connected to an external power supply, a cathode end of the isolation optocoupler is electrically connected to an emitter of the first triode and an emitter of the second triode, a collector electrode of the isolation optocoupler is electrically connected to an output interface FO, and an emitter of the isolation optocoupler is grounded.
7. The servo overcurrent protection circuit of claim 2, wherein: the signal amplification module (2) comprises a signal amplification chip and a peripheral standard circuit of the signal amplification chip, wherein the inverting input end and the non-inverting input end of the signal amplification chip are respectively and electrically connected to the two ends of the high-precision sampling resistor, and the output end of the signal amplification chip is electrically connected to the input end of the comparison unit (31).
8. The servo overcurrent protection circuit of claim 2, wherein: a voltage stabilizing part (4) is arranged between the signal amplification module (2) and the detection comparison module (3), the input end of the voltage stabilizing part (4) is electrically connected to the output end of the signal amplification module (2), and the output end of the voltage stabilizing part (4) is electrically connected to the input end of the comparison unit (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223425156.3U CN218829082U (en) | 2022-12-19 | 2022-12-19 | Servo overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223425156.3U CN218829082U (en) | 2022-12-19 | 2022-12-19 | Servo overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218829082U true CN218829082U (en) | 2023-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223425156.3U Active CN218829082U (en) | 2022-12-19 | 2022-12-19 | Servo overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218829082U (en) |
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2022
- 2022-12-19 CN CN202223425156.3U patent/CN218829082U/en active Active
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