CN216531127U - Servo motor protection circuit - Google Patents
Servo motor protection circuit Download PDFInfo
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- CN216531127U CN216531127U CN202122314307.7U CN202122314307U CN216531127U CN 216531127 U CN216531127 U CN 216531127U CN 202122314307 U CN202122314307 U CN 202122314307U CN 216531127 U CN216531127 U CN 216531127U
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Abstract
The utility model provides a servo motor protection circuit, comprising: the motor back-pressure protection module is arranged between a power supply of the motor and a motor power supply and is used for protecting reverse voltage produced by the motor from flowing back to other circuits. And the motor back pressure releasing module is connected with the motor power supply and is used for releasing the voltage of the part of the reverse voltage exceeding the power supply voltage value. And the motor locked-rotor protection module is connected between the motor power supply and the MCU and is used for performing overcurrent and locked-rotor protection on the motor. The motor locked-rotor protection module comprises a current acquisition module and a current detection module, wherein the current acquisition module is connected in series on the motor power supply branch circuit, and the current detection module is connected between the current acquisition module and the MCU and used for feeding back current signals acquired by the current acquisition module to the MCU after AD conversion.
Description
Technical Field
The utility model relates to the field of servo motors, in particular to a servo motor protection circuit.
Background
When more and more motor driving products exist in the society, the back pressure generated by the motor if the motor is not reasonably designed can affect electronic devices on a PCB or the motor is locked up to cause motor burnout.
In view of the above, how to effectively protect the servo motor is a technical problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a servo motor protection circuit.
The utility model aims to solve the problem of protecting a motor.
In order to solve the problems, the utility model is realized by the following technical scheme:
a servo motor protection circuit comprising:
the motor back-pressure protection module is arranged between a power supply of the motor and a motor power supply and is used for protecting reverse voltage produced by the motor from flowing back to other circuits;
the motor back pressure releasing module is connected with the motor power supply and used for releasing the voltage of the part of the reverse voltage exceeding the power supply voltage value;
the motor locked-rotor protection module is connected between the motor power supply and the MCU and is used for performing overcurrent and locked-rotor protection on the motor;
the motor locked-rotor protection module comprises a current acquisition module and a current detection module, wherein the current acquisition module is connected in series on the motor power supply branch circuit, and the current detection module is connected between the current acquisition module and the MCU and used for feeding back current signals acquired by the current acquisition module to the MCU after AD conversion.
Further, the motor back-pressure protection module comprises a diode connected in series between a power supply of the motor and a motor power supply, an inductor connected between the diode and the motor power supply, and a first capacitor and a second capacitor connected to two ends of the inductor; the anode of the diode is connected with a power supply of the motor, and the other ends of the first capacitor and the second capacitor are grounded.
Further, the voltage back-pressure releasing module comprises a first resistor, a voltage regulator tube and a second resistor which are connected in sequence; one end of the first resistor, which is far away from the voltage-regulator tube, is connected with the motor power supply, the cathode of the voltage-regulator tube is connected with the first resistor, and the other end of the second resistor is grounded.
Further, the current collection module comprises a third resistor connected in series to the motor power branch.
Further, the third resistance is an alloy resistance.
Furthermore, the current collection module comprises a current detection amplifier of which the input end is connected to two ends of the third resistor respectively, and the output end of the current detection amplifier is connected to the MCU after being connected to the fourth resistor.
Further, a third capacitor is connected between the output end of the current detection amplifier and the MCU, and the other end of the third capacitor is grounded.
Further, the current detection amplifier is an INA180A2IDBVR, three pins of the current detection amplifier are connected to a 3.3V power supply, a fourth capacitor is further connected between five pins of the current detection amplifier and the 3.3V power supply, the other end of the fourth capacitor is grounded, and two pins of the current detection amplifier are grounded.
Further, the diode is VSSAF5L45FB 12.
Compared with the prior art, the technical scheme and the beneficial effects of the utility model are as follows:
(1) the servo motor protection circuit disclosed by the utility model can be used for carrying out reverse voltage reverse filling prevention, reverse voltage clamping release, real-time current detection and closing control on the motor, thereby comprehensively protecting the motor.
(2) According to the motor back-pressure protection module, the diode is added between the power supply and the motor power supply to prevent reverse voltage from reversely flowing, and meanwhile, the inductor and the capacitor are added to filter the power supply.
(3) The motor back pressure releasing module comprises a first resistor, a voltage regulator tube and a second resistor which are connected in sequence, and the voltage of the part of reverse voltage which is generated by the motor and exceeds the power supply voltage value is released through the voltage regulator tube, so that the motor is protected.
(4) According to the motor locked-rotor protection module, the real-time current of the motor is collected through the alloy resistor, the real-time current is subjected to AD conversion through the current detection amplifier and then is transmitted to the MCU to be compared with the preset value, so that the power supply of the motor is turned off when the real-time current exceeds the preset maximum value, and overcurrent and locked-rotor protection of the motor is achieved.
(5) The protection circuit disclosed by the utility model is simple in structure, remarkable in protection effect and capable of effectively protecting the motor.
Drawings
Fig. 1 is a schematic circuit diagram of a motor back-pressure protection module according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a motor back pressure releasing module according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a motor locked-rotor protection module according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of the MCU connected to the motor power supply according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A servo motor protection circuit comprises a motor back-pressure protection module, a motor back-pressure release module and a motor locked-rotor protection module, wherein the motor back-pressure protection module is connected between a power supply and a motor power supply of a motor, the motor back-pressure release module is connected with the motor power supply, and the motor locked-rotor protection module is connected between the motor power supply and an MCU. The motor back pressure protection module is used for protecting reverse voltage produced by a motor from flowing back to other circuits, the motor back pressure release module is used for releasing voltage of a part of the reverse voltage produced by the motor, the motor stalling protection module comprises a current acquisition module and a current detection module, the current acquisition module is connected in series on a motor power supply branch, the current detection module is connected between the current acquisition module and an MCU (microprogrammed control unit), the current acquisition module acquires real-time current of the motor, the current detection module transmits the real-time current to the MCU after AD (analog-to-digital) conversion, the MCU closes a power supply of the motor when the real-time current exceeds the standard, and therefore overcurrent and stalling protection is achieved for the motor.
Referring to fig. 1, the motor back-voltage protection module includes a diode D1 connected in series between a power supply of the motor and a motor power supply, an inductor L1 connected between the diode D1 and the motor power supply, and a first capacitor C1 and a second capacitor C2 connected to two ends of the inductor L1; the anode of the diode D1 is connected with the power supply of the motor, and the other ends of the first capacitor C1 and the second capacitor C2 are grounded. The diode D1 has a low on-voltage, a large current, and a high back-voltage resistance, and in this embodiment, VSSAF5L45FB12 is used. The diode D1 is connected between the power supply and the motor power supply, and when the motor generates reverse voltage, the reverse voltage is ensured not to flow back to other circuits, so that the motor is protected. The inductor L, the first capacitor C1 and the second capacitor C2 filter the power supply, wherein the second capacitor C2 is an electrolytic capacitor. In other embodiments, the two ends of the second capacitor C2 may be connected in parallel with a plurality of magnetic sheet capacitors with small capacitance values, in order to reduce the cost of the capacitor with large capacitance value, an electrolytic capacitor is selected, the high frequency impedance of the capacitor is large, and the filtering effect on the high frequency ripple is not good, so that two ends of the second capacitor C2 may be connected in parallel with one or more magnetic sheet capacitors with different capacitance values to filter the high frequency ripple, so as to achieve a better balance between the cost and the using effect.
Referring to fig. 2, the motor back-pressure releasing module includes a first resistor R1, a voltage regulator D2, and a second resistor R2 connected in sequence. One end of the first resistor R1, which is far away from the voltage regulator tube D2, is connected with a motor power supply, the cathode of the voltage regulator tube D2 is connected with the first resistor F1, and the other end of the second resistor R2 is grounded. When the motor generates reverse voltage, the voltage regulator tube D2 clamps and releases the part of the motor with the reverse voltage value exceeding the power supply voltage value by the voltage regulator tube D2, so as to play a role in releasing back pressure.
Referring to fig. 3 and 4, the current collection module includes a third resistor R3 connected in series to the power supply branch of the motor, the current collection module includes a current detection amplifier U1 having an input end connected to both ends of the third resistor R3, respectively, and an output end of the current detection amplifier U1 is connected to the MCU after being connected to the fourth resistor R4.
A third capacitor C3 is further connected between the output end of the current detection amplifier U1 and the MCU, the third capacitor C3 filters the output signal of the current detection amplifier U1, and the other end of the third capacitor C3 is grounded. The model of the current detection amplifier U1 is INA180A2IDBVR, the three pins of the current detection amplifier are connected with a 3.3V power supply, a fourth capacitor C4 is further connected between the five pins of the current detection amplifier U1 and the 3.3V power supply, the fourth capacitor C4 filters power supply output of an external power supply, the other end of the fourth capacitor C4 is grounded, and the two pins of the current detection amplifier U1 are grounded.
The real-time current of the motor is sampled through the third resistor R3, the collected current is input to the current detection amplifier U1, the current information is fed back to the MCU after AD conversion is carried out through the current detection amplifier U1, the MCU compares the received current information with a preset current value, and if the real-time current exceeds a preset maximum current value, the MCU controls to close the power supply current of the motor, so that the overcurrent and locked rotor effects of the motor are protected. The third resistor R3 of the utility model adopts the alloy resistor to collect the real-time current of the motor, and has the characteristics of low resistance, high stability, high power and the like, thereby being more suitable for current detection.
The servo motor protection circuit provided by the utility model has the advantages that reverse voltage generated by the motor is prevented from flowing backwards and is clamped and released, and the overcurrent or locked rotation is prevented by carrying out acquisition comparison and closing control on the real-time current of the motor, so that the motor is protected. The protection circuit has a simple structure, so that the protection circuit can well play a role in protection while saving cost and is very practical.
While the above description shows and describes the preferred embodiments of the present invention, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (9)
1. A servo motor protection circuit, comprising:
the motor back-pressure protection module is arranged between a power supply of the motor and a motor power supply and is used for protecting reverse voltage produced by the motor from flowing back to other circuits;
the motor back pressure releasing module is connected with the motor power supply and used for releasing the voltage of the part of the reverse voltage exceeding the power supply voltage value;
the motor locked-rotor protection module is connected between the motor power supply and the MCU and is used for performing overcurrent and locked-rotor protection on the motor;
the motor locked-rotor protection module comprises a current acquisition module and a current detection module, wherein the current acquisition module is connected in series on the motor power supply branch circuit, and the current detection module is connected between the current acquisition module and the MCU and used for feeding back current signals acquired by the current acquisition module to the MCU after AD conversion.
2. The servo motor protection circuit according to claim 1, wherein the motor back-pressure protection module comprises a diode connected in series between a power supply of the motor and a motor power supply, an inductor connected between the diode and the motor power supply, and a first capacitor and a second capacitor connected across the inductor; the anode of the diode is connected with a power supply of the motor, and the other ends of the first capacitor and the second capacitor are grounded.
3. The servo motor protection circuit according to claim 1, wherein the voltage back-pressure releasing module comprises a first resistor, a voltage regulator tube and a second resistor which are connected in sequence; one end of the first resistor, which is far away from the voltage-regulator tube, is connected with the motor power supply, the cathode of the voltage-regulator tube is connected with the first resistor, and the other end of the second resistor is grounded.
4. The servo motor protection circuit of claim 1, wherein the current collection module comprises a third resistor connected in series with the motor power branch.
5. The servo motor protection circuit of claim 4, wherein the third resistor is an alloy resistor.
6. The protection circuit of claim 4, wherein the current collection module comprises a current detection amplifier having an input terminal connected to two ends of the third resistor, respectively, and an output terminal of the current detection amplifier is connected to the MCU after being connected to the fourth resistor.
7. The protection circuit of claim 6, wherein a third capacitor is further connected between the output terminal of the current detection amplifier and the MCU, and the other end of the third capacitor is grounded.
8. The servo motor protection circuit of claim 6, wherein the current sense amplifier is INA180A2IDBVR, the three pins of the current sense amplifier are connected to a 3.3V power supply, a fourth capacitor is further connected between the five pins of the current sense amplifier and the 3.3V power supply, the other end of the fourth capacitor is grounded, and the two pins of the current sense amplifier are grounded.
9. The servo motor protection circuit of claim 2, wherein the diode is VSSAF5L45FB 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122314307.7U CN216531127U (en) | 2021-09-24 | 2021-09-24 | Servo motor protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122314307.7U CN216531127U (en) | 2021-09-24 | 2021-09-24 | Servo motor protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216531127U true CN216531127U (en) | 2022-05-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122314307.7U Active CN216531127U (en) | 2021-09-24 | 2021-09-24 | Servo motor protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216531127U (en) |
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2021
- 2021-09-24 CN CN202122314307.7U patent/CN216531127U/en active Active
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