CN117977496A - PWM motor speed regulation device with feedback diagnosis function - Google Patents
PWM motor speed regulation device with feedback diagnosis function Download PDFInfo
- Publication number
- CN117977496A CN117977496A CN202410363713.8A CN202410363713A CN117977496A CN 117977496 A CN117977496 A CN 117977496A CN 202410363713 A CN202410363713 A CN 202410363713A CN 117977496 A CN117977496 A CN 117977496A
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- pwm
- motor
- circuit
- feedback
- voltage
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 45
- 230000033228 biological regulation Effects 0.000 title description 2
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
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- Control Of Direct Current Motors (AREA)
Abstract
The invention relates to the technical field of motor control, and particularly discloses a PWM motor speed regulating device with a feedback diagnosis function. The PWM input module also comprises a PWM input interface and a PWM identification circuit, wherein the PWM identification circuit is connected with the motor voltage control circuit, and after the PWM input interface receives PWM signals, the PWM signals are identified by the PWM identification circuit to generate control signals, and the control signals are input into the motor voltage control circuit. The PWM identification circuit is connected with the MOSFET through the gate-level power amplifier. The system has the fault diagnosis function and ensures the stable and safe operation of products.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a PWM motor speed regulating device with a feedback diagnosis function.
Background
In the field of motor control, the voltage variation at two ends of a motor is regulated by using the duty ratio of a PWM signal, so that the control of the motor rotating speed is realized. MOSFET tubes are often used in motor control along with PWM signals because of their characteristics to enable high frequency switching.
However, when the motor is controlled, feedback and control of the voltage, current and temperature of the whole control system are also not neglectable risk problems, and the existing protection device in the motor control device is still not perfect enough and is not integrated enough, so that the motor control device cannot cope with the higher and higher use demands.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a PWM motor speed regulating device with a feedback diagnosis function, which comprises a PWM input module, a motor driving power module and a motor, wherein a voltage source input interface in the motor driving power module is connected with the positive electrode and the negative electrode of the motor through a circuit to provide driving voltage, the positive electrode and the negative electrode of the motor are connected with a motor voltage control circuit, and the motor voltage control circuit is used for controlling the driving voltage of the motor.
The PWM input module further comprises a PWM input interface and a PWM identification circuit, the PWM identification circuit is connected with the motor voltage control circuit, after the PWM input interface receives PWM signals, the PWM signals are identified through the PWM identification circuit to generate control signals, the control signals are input into the motor voltage control circuit, and the identification content is mainly the duty ratio of the PWM signals.
The PWM identification circuit is connected with the G end of the MOSFET through the gate-level power amplifier, the D end of the MOSFET is connected with the cathode of the motor, the S end of the MOSFET is connected with one end of a shunt resistor, and the other end of the shunt resistor is grounded. The MOSFET performs switching with a certain frequency according to the duty ratio of the PWM signal, so as to realize adjustment of the motor voltage.
Further, the PWM identification circuit is connected with one end of a voltage protection circuit in the system power supply module, the system power supply module further comprises a system power supply battery, and the system power supply battery is connected with the other end of the voltage protection circuit.
Further, an electromagnetic filter and a transient voltage suppression diode are arranged between the voltage source input interface and the motor.
Further, the PWM input module further includes a feedback diagnosis circuit and a feedback diagnosis interface, where the feedback diagnosis circuit is connected with the voltage protection circuit, and outputs a feedback diagnosis signal through the feedback diagnosis interface.
Further, the feedback diagnosis circuit is connected with one end of the temperature protection circuit, the other end of the temperature protection circuit is connected with the temperature-sensitive resistor, and the other end of the temperature-sensitive resistor is grounded.
Further, the feedback diagnosis circuit is also connected with one end of a current protection circuit, and the other end of the current protection circuit is connected with the shunt resistor.
Further, the other end of the PWM input interface of the PWM input module, which is opposite to the PWM identification circuit, is connected with the PWM control circuit.
Further, a triode is arranged in an internal circuit of the feedback diagnosis interface, a base electrode of the triode is connected with an upper computer, an emitting electrode of the triode is connected with the PWM input interface, a collecting electrode of the triode is grounded, the triode pulls down the voltage of the PWM input interface, and the diagnosis signal is output through the base electrode. When overvoltage condition occurs, the voltage of the device is 18+/-1V, the feedback diagnosis circuit immediately cuts off the output of the device, after overvoltage is removed, the voltage is restored to 17+/-1V, the feedback diagnosis circuit restores the output of the device, and the motor is restored to operate. When under-voltage condition appears, the device voltage is 6.25+ -0.25V, and feedback diagnostic circuit cuts off the output of device immediately, and after under-voltage is removed, voltage resumes 8+ -0.5V, and feedback diagnostic circuit resumes the output of device, and the motor resumes operation. When the motor is short-circuited, the feedback diagnosis circuit immediately cuts off the output of the device, tries to start the motor every 2s, repeats for 4 times, tries to start the motor every 30s after 4 times, and returns to operation until the fault is relieved. When the overcurrent condition occurs, the motor current is larger than the limit value, the feedback diagnosis circuit immediately cuts off the output of the device, and tries to start the motor every 500ms until the fault is relieved, and the motor resumes operation. When the over-temperature condition occurs, the internal temperature of the device reaches 120+/-10 ℃, the feedback diagnosis circuit reduces the output of the device and reduces the voltage of the motor, and if the temperature continuously rises to 135+/-10 ℃, the feedback diagnosis circuit turns off the output of the device until the temperature is reduced to 90+/-10 ℃, and the motor resumes operation. When the motor stalling condition occurs, the feedback diagnosis circuit immediately turns off the output of the device, starts every 2s, repeats for 10 times, and starts every 2min until the fault is relieved, and the motor resumes operation. When the motor is disconnected from the module, the feedback diagnosis circuit immediately turns off the output of the device, tries to start the motor every 5s until the fault is relieved, and the motor resumes operation.
The priority of the fault information feedback is: the motor short circuit > overcurrent/locked rotor > overtemperature > overvoltage/undervoltage > motor open circuit, and the continuous period of fault signal output exists all the time until the fault is released, so that the clear judgment of CCM on the fault is ensured.
The beneficial effects of the invention are as follows:
(1) By arranging the MOSFET, the motor is controlled with higher precision;
(2) The voltage protection circuit, the temperature protection circuit, the current protection circuit and the feedback diagnosis circuit are arranged to continuously monitor the conditions of the device and the motor, and the input of the PWM input interface is pulled down through the triode, so that the device and the motor have safety guarantee in the working process.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Detailed Description
In order to further illustrate the technical means and effects adopted by the present invention for achieving the intended purpose, the following description of the specific embodiments, structures, features and effects according to the present invention will be clearly and completely described with reference to the accompanying drawings and preferred embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present application, it should be understood that the orientation or positional relationship indicated as being "inside", "outside", etc. is the orientation or position described based on the drawings, is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific orientation, a specific orientation configuration and operation, and thus should not be construed as limiting the present application.
Referring to fig. 1, a PWM motor speed regulating device with feedback diagnosis function disclosed in the invention includes a PWM input module, a motor driving power module and a motor, wherein a voltage source input interface in the motor driving power module is connected with the positive and negative poles of the motor through a circuit to provide driving voltage, and the positive and negative poles of the motor are connected with a motor voltage control circuit for controlling the driving voltage of the motor. PWM input module inputs the PWM signal of frequency 40HZ ~1300HZ, adjusts motor rotational speed through MOSFET pipe. The magnitude of the input PWM signal is high level >5V, low level <1.5V, and slope is rising/falling <100us. When the duty cycle of the PWM signal satisfies the following condition, the motor is in the corresponding voltage gear (duty is the duty cycle):
the duty is less than 14%, and the motor is turned off;
The duty is more than or equal to 14 percent and less than 95 percent, and the motor voltage is more than 2.5V and less than 14V;
duty=95%, motor voltage=maximum output voltage;
the duty is more than 95% and the motor is turned off.
The PWM input module further comprises a PWM input interface and a PWM identification circuit, the PWM identification circuit is connected with the motor voltage control circuit, after the PWM input interface receives PWM signals, the PWM signals are identified through the PWM identification circuit to generate control signals, the control signals are input into the motor voltage control circuit, and the identification content is mainly the duty ratio of the PWM signals.
The PWM identification circuit is connected with the G end of the MOSFET through the gate-level power amplifier, the D end of the MOSFET is connected with the cathode of the motor, the S end of the MOSFET is connected with one end of a shunt resistor, and the other end of the shunt resistor is grounded. The MOSFET performs switching with a certain frequency according to the duty ratio of the PWM signal, so as to realize adjustment of the motor voltage.
Further, the PWM identification circuit is connected with one end of a voltage protection circuit in the system power supply module, the system power supply module further comprises a system power supply battery, and the system power supply battery is connected with the other end of the voltage protection circuit.
Further, an electromagnetic filter and a transient voltage suppression diode are arranged between the voltage source input interface and the motor.
Further, the PWM input module further includes a feedback diagnosis circuit and a feedback diagnosis interface, where the feedback diagnosis circuit is connected with the voltage protection circuit, and outputs a feedback diagnosis signal through the feedback diagnosis interface.
Further, the feedback diagnosis circuit is connected with one end of the temperature protection circuit, the other end of the temperature protection circuit is connected with the temperature-sensitive resistor, and the other end of the temperature-sensitive resistor is grounded.
Further, the feedback diagnosis circuit is also connected with one end of a current protection circuit, and the other end of the current protection circuit is connected with the shunt resistor.
Further, the other end of the PWM input interface of the PWM input module, which is opposite to the PWM identification circuit, is connected with the PWM control circuit.
Preferably, the voltage protection circuit, the PWM identification circuit, the feedback diagnostic circuit, the temperature protection circuit, the motor voltage control circuit, the gate power amplifier, the current protection circuit are integrated in the same main body housing. The PWM identification circuit and the feedback diagnosis circuit form a main body circuit of the PWM input module, the main body circuit connects the PWM identification circuit with the motor voltage control circuit, the gate level power amplifier and the voltage protection circuit through pins, and the main body circuit connects the feedback diagnosis circuit with the voltage protection circuit, the temperature protection circuit and the current protection circuit through pins.
Further, a triode is arranged in an internal circuit of the feedback diagnosis interface, a base electrode of the triode is connected with an upper computer, an emitting electrode of the triode is connected with the PWM input interface, a collecting electrode of the triode is grounded, the triode pulls down the voltage of the PWM input interface, and the diagnosis signal is output through the base electrode. When overvoltage condition occurs, the voltage of the device is 18+/-1V, the feedback diagnosis circuit immediately cuts off the output of the device, after overvoltage is removed, the voltage is restored to 17+/-1V, the feedback diagnosis circuit restores the output of the device, and the motor is restored to operate. When under-voltage condition appears, the device voltage is 6.25+ -0.25V, and feedback diagnostic circuit cuts off the output of device immediately, and after under-voltage is removed, voltage resumes 8+ -0.5V, and feedback diagnostic circuit resumes the output of device, and the motor resumes operation. When the motor is short-circuited, the feedback diagnosis circuit immediately cuts off the output of the device, tries to start the motor every 2s, repeats for 4 times, tries to start the motor every 30s after 4 times, and returns to operation until the fault is relieved. When the overcurrent condition occurs, the motor current is larger than the limit value, the feedback diagnosis circuit immediately cuts off the output of the device, and tries to start the motor every 500ms until the fault is relieved, and the motor resumes operation. When the over-temperature condition occurs, the internal temperature of the device reaches 120+/-10 ℃, the feedback diagnosis circuit reduces the output of the device and reduces the voltage of the motor, and if the temperature continuously rises to 135+/-10 ℃, the feedback diagnosis circuit turns off the output of the device until the temperature is reduced to 90+/-10 ℃, and the motor resumes operation. When the motor stalling condition occurs, the feedback diagnosis circuit immediately turns off the output of the device, starts every 2s, repeats for 10 times, and starts every 2min until the fault is relieved, and the motor resumes operation. When the motor is disconnected from the module, the feedback diagnosis circuit immediately turns off the output of the device, tries to start the motor every 5s until the fault is relieved, and the motor resumes operation.
The priority of the fault information feedback is: the motor short circuit > overcurrent/locked rotor > overtemperature > overvoltage/undervoltage > motor open circuit, and the continuous period of fault signal output exists all the time until the fault is released, so that the clear judgment of CCM on the fault is ensured.
The present invention is not limited to the above embodiments, but is not limited to the above embodiments, and any technical modifications, equivalents and modifications made to the above embodiments according to the technical principles of the present invention can be made by those skilled in the art without departing from the scope of the invention.
Claims (8)
1. The PWM motor speed regulating device with the feedback diagnosis function comprises a PWM input module, a motor driving power module and a motor, and is characterized in that a voltage source input interface in the motor driving power module is connected with the positive electrode and the negative electrode of the motor through a circuit to provide driving voltage, the positive electrode and the negative electrode of the motor are connected with a motor voltage control circuit, and the motor voltage control circuit is used for controlling the driving voltage of the motor;
The PWM input module also comprises a PWM input interface and a PWM identification circuit, wherein the PWM identification circuit is connected with the motor voltage control circuit, and after the PWM input interface receives a PWM signal, the PWM signal is identified by the PWM identification circuit to generate a control signal, and the control signal is input into the motor voltage control circuit;
the PWM identification circuit is connected with the G end of the MOSFET through the gate-level power amplifier, the D end of the MOSFET is connected with the cathode of the motor, the S end of the MOSFET is connected with one end of a shunt resistor, and the other end of the shunt resistor is grounded.
2. The PWM motor speed regulator with feedback diagnostic function according to claim 1, wherein the PWM identification circuit is connected to one end of a voltage protection circuit in a system power module, the system power module further comprises a system power battery, and the system power battery is connected to the other end of the voltage protection circuit.
3. The PWM motor speed regulator with feedback diagnostic function of claim 1, wherein an electromagnetic filter and a transient voltage suppression diode are provided between the voltage source input interface and the motor.
4. The PWM motor speed regulator with feedback diagnostic function of claim 1, wherein the PWM input module further comprises a feedback diagnostic circuit and a feedback diagnostic interface, the feedback diagnostic circuit is connected with the PWM identification circuit, and the feedback diagnostic signal is output through the feedback diagnostic interface.
5. The PWM motor speed regulator with feedback diagnostic function according to claim 4, wherein the feedback diagnostic circuit is connected to one end of a temperature protection circuit, the other end of the temperature protection circuit is connected to a temperature-sensitive resistor, and the other end of the temperature-sensitive resistor is grounded.
6. The PWM motor speed regulator with feedback diagnostic function according to claim 4, wherein the feedback diagnostic circuit is further connected to one end of a current protection circuit, and the other end of the current protection circuit is connected to the shunt resistor.
7. The PWM motor speed regulator with feedback diagnostic function of claim 1, wherein the PWM input interface of the PWM input module is connected to the PWM control circuit at the other end of the PWM input interface relative to the PWM identification circuit.
8. The PWM motor speed regulator with feedback diagnostic function according to claim 4, wherein a triode is provided in the internal circuit of the feedback diagnostic interface, a base electrode of the triode is connected with an upper computer, an emitter electrode of the triode is connected with the PWM input interface, a collector electrode of the triode is grounded, the triode pulls down the voltage of the PWM input interface, and the diagnostic signal is output through the base electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410363713.8A CN117977496A (en) | 2024-03-28 | 2024-03-28 | PWM motor speed regulation device with feedback diagnosis function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410363713.8A CN117977496A (en) | 2024-03-28 | 2024-03-28 | PWM motor speed regulation device with feedback diagnosis function |
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| Publication Number | Publication Date |
|---|---|
| CN117977496A true CN117977496A (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410363713.8A Pending CN117977496A (en) | 2024-03-28 | 2024-03-28 | PWM motor speed regulation device with feedback diagnosis function |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453541A (en) * | 2016-06-01 | 2017-12-08 | 德昌电机(深圳)有限公司 | Motor and the fan with the motor |
| CN111262479A (en) * | 2020-03-26 | 2020-06-09 | 宁波依恒智能科技有限公司 | Multi-path motor integrated time-sharing control system and control method |
| CN220626887U (en) * | 2022-12-28 | 2024-03-19 | 江苏云意电气股份有限公司 | Electronic water pump controller with fault feedback function for automobile |
-
2024
- 2024-03-28 CN CN202410363713.8A patent/CN117977496A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453541A (en) * | 2016-06-01 | 2017-12-08 | 德昌电机(深圳)有限公司 | Motor and the fan with the motor |
| CN111262479A (en) * | 2020-03-26 | 2020-06-09 | 宁波依恒智能科技有限公司 | Multi-path motor integrated time-sharing control system and control method |
| CN220626887U (en) * | 2022-12-28 | 2024-03-19 | 江苏云意电气股份有限公司 | Electronic water pump controller with fault feedback function for automobile |
Non-Patent Citations (1)
| Title |
|---|
| 汪贵平 等: "新编单片机原理及应用", 31 December 2022, pages: 307 - 310 * |
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