CN117254722B - Variable frequency switch control protection circuit - Google Patents
Variable frequency switch control protection circuit Download PDFInfo
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- CN117254722B CN117254722B CN202311523483.9A CN202311523483A CN117254722B CN 117254722 B CN117254722 B CN 117254722B CN 202311523483 A CN202311523483 A CN 202311523483A CN 117254722 B CN117254722 B CN 117254722B
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- 238000006243 chemical reaction Methods 0.000 claims description 30
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 10
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
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- 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
- H02H7/0811—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 for dc motors
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- 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
- H02H7/0833—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 for electric motors with control arrangements
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- 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
- H02H7/09—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 over-voltage; against reduction of voltage; against phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/08—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/292—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a variable frequency switch control protection circuit, which relates to the technical field of direct current motors and comprises a power supply module, a control circuit and a control circuit, wherein the power supply module is used for accessing electric energy; the intelligent control module is used for signal receiving and module control; the power regulation module is used for rectifying, power regulation, filtering and voltage sampling; the balance control module is used for controlling power balance; the variable frequency switch switching module is used for switching signal transmission paths, controlling the variable frequency adjusting module and the auxiliary variable frequency module to adjust power supply frequency and controlling the auxiliary variable frequency module to perform power transmission work; the voltage detection module is used for detecting voltage and judging overvoltage; and the direct current motor module is used for converting electromechanical energy. The variable frequency switch control protection circuit can realize power adjustment and power balance and adjust the working power of the direct current motor module, when in overvoltage, the auxiliary variable frequency module is switched to drive the direct current motor module to work, and when in braking, the auxiliary variable frequency module also carries out electric energy transmission.
Description
Technical Field
The invention relates to the technical field of direct current motors, in particular to a variable frequency switch control protection circuit.
Background
The DC motor is widely applied in electric traction because of good speed regulation performance, and the existing DC motor is mainly controlled by a singlechip to change the rotating speed of the DC motor by changing the working frequency of the DC motor in a mode of controlling a variable frequency switch, but when the variable frequency switch fails, the singlechip only can protect the DC motor in a power-off mode to avoid damaging the DC motor, so that the working efficiency of the DC motor is caused, and when the DC motor brakes, regenerated electric energy is generated due to inertia and needs to be transmitted again through the variable frequency switch, so that the service life of the variable frequency switch is easily reduced for a long time, and the motor is to be improved.
Disclosure of Invention
The embodiment of the invention provides a variable frequency switch control protection circuit, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a variable frequency switch control protection circuit, comprising: the device comprises a power supply module, an intelligent control module, a power regulation module, a balance control module, a variable frequency switch switching module, a variable frequency regulation module, an auxiliary variable frequency module, a voltage detection module and a direct current motor module;
the power module is used for accessing alternating current electric energy;
the intelligent control module is connected with the power adjusting module, the balance control module, the variable frequency switch switching module and the voltage detection module, and is used for outputting a first pulse signal and controlling the work of the power adjusting module, outputting a second pulse signal and controlling the work of the balance control module, receiving a first sampling signal output by the power adjusting module and adjusting the duty ratio of the first pulse signal and the second pulse signal according to the received signal, outputting a third pulse signal, outputting a first control signal and controlling the work of the variable frequency switch switching module, receiving a second sampling signal output by the voltage detection module and adjusting the duty ratio of the third pulse signal according to the received signal;
the power regulation module is connected with the power supply module and used for receiving a first pulse signal, rectifying, power regulating and filtering the accessed alternating current electric energy, voltage sampling the processed electric energy and transmitting a first sampling signal to the intelligent control module;
the balance control module is connected with the power regulation module and is used for receiving a second pulse signal, storing the input electric energy and performing electric energy compensation on the power regulation module;
the variable frequency switch switching module is connected with the variable frequency adjusting module, the voltage detecting module and the auxiliary variable frequency module and used for transmitting a third pulse signal to the variable frequency adjusting module, receiving a third control signal output by the voltage detecting module and a first control signal output by the intelligent control module and outputting a second control signal, and switching a passage through the second control signal and transmitting the third pulse signal to the auxiliary variable frequency module;
the variable frequency adjusting module is connected with the power adjusting module and is used for receiving the third pulse signal transmitted by the variable frequency switch switching module and adjusting the power supply frequency;
the auxiliary frequency conversion module is connected with the power regulation module and is used for receiving the third pulse signal and the second control signal transmitted by the frequency conversion switch switching module, regulating the power supply frequency and transmitting the regenerated electric energy generated by the direct current motor module;
the voltage detection module is connected with the direct current motor module, and is used for carrying out voltage detection and overvoltage judgment on the direct current motor module, outputting a second sampling signal and a third control signal, transmitting the second sampling signal to the intelligent control module, and transmitting the third control signal to the intelligent control module and the variable frequency switch switching module;
and the direct current motor module is connected with the frequency conversion adjusting module and the auxiliary frequency conversion module and is used for receiving the electric energy transmitted by the frequency conversion adjusting module and the auxiliary frequency conversion module and converting the electric energy into mechanical energy and converting the mechanical energy into regenerated electric energy when braking.
As still further aspects of the invention: the power module comprises a power interface; the power regulation module comprises a first rectifier, a first inductor, a first power tube, a first diode, a first capacitor, a first resistor and a second resistor; the intelligent control module comprises a first controller;
preferably, the first end and the second end of the power interface are respectively connected with the first input end and the second input end of the first rectifier, the first output end of the first rectifier is connected with the anode of the first diode and the drain electrode of the first power tube through the first inductor, the cathode of the first diode is connected with the first end of the first capacitor and connected with one end of the second resistor and the IO2 end of the first controller through the first resistor, the source electrode of the first power tube, the second end of the first capacitor, the second end of the second resistor and the second output end of the first rectifier are grounded, and the grid electrode of the first power tube is connected with the IO1 end of the first controller.
As still further aspects of the invention: the balance control module comprises a second inductor, a seventh power tube, an eighth power tube and a second capacitor;
preferably, the drain electrode of the seventh power tube is connected with the source electrode of the eighth power tube and is connected with the first end of the first capacitor through the second inductor, the drain electrode of the eighth power tube is connected with the source electrode of the seventh power tube and the second end of the first capacitor through the second capacitor, and the grid electrode of the seventh power tube and the grid electrode of the eighth power tube are respectively connected with the IO7 end and the IO8 end of the first controller.
As still further aspects of the invention: the variable frequency switch switching module comprises a first analog switch, a third resistor, a first power supply, a first switching tube, a second diode and a third diode;
preferably, the IN1 end and the IN2 end of the first analog switch are both connected with the IO3 end of the first controller, the OUT1 end and the OUT2 end of the first analog switch are respectively connected with the variable frequency adjustment module and the auxiliary variable frequency module, the CTRL2 end of the first analog switch is connected with the base electrode of the first switch tube, the cathode of the second diode, the cathode of the third diode and the auxiliary variable frequency module, the emitter of the first switch tube is grounded, the collector of the first switch tube is connected with the CTRL1 end of the first analog switch and is connected with the first power supply through the third resistor, the anode of the second diode is connected with the voltage detection module, and the anode of the third diode is connected with the IO4 end of the first controller.
As still further aspects of the invention: the frequency conversion regulating module comprises a second power tube, a first diode and a third power tube; the direct current motor module comprises a direct current motor;
preferably, the drain electrode of the second power tube is connected with the first end of the first capacitor, the source electrode of the second power tube is connected with the anode of the first diode, the cathode of the first diode is connected with the first end of the direct current motor, the second end of the direct current motor is connected with the drain electrode of the third power tube, the source electrode of the third power tube is grounded, and the grid electrodes of the second power tube and the third power tube are both connected with the OUT1 end of the first analog switch.
As still further aspects of the invention: the auxiliary frequency conversion module comprises a fourth power tube, a fifth power tube and a sixth power tube;
preferably, the source electrode of the fourth power tube is connected with the drain electrode of the second power tube, the drain electrode of the fourth power tube is connected with the drain electrode of the fifth power tube, the source electrode of the fifth power tube is connected with the first end of the direct current motor, the drain electrode of the sixth power tube is connected with the second end of the direct current motor, the source electrode of the sixth power tube is connected with the source electrode of the third power tube, and the grid electrodes of the fifth power tube and the sixth power tube are both connected with the OUT2 end of the first analog switch.
As still further aspects of the invention: the voltage detection module comprises a fourth resistor, a fifth resistor, a fourth diode, a fifth diode, a first comparator, a first threshold device and a sixth resistor;
preferably, one end of the fourth resistor is connected with the first end of the direct current motor, the other end of the fourth resistor is connected with the anode of the fourth diode and the IO5 end of the first controller and is connected with the second end of the direct current motor through the fifth resistor, the cathode of the fourth diode is connected with the cathode of the fifth diode and the in-phase end of the first comparator, the anode of the fifth diode is connected with the output end of the first comparator and is connected with the IO6 pin of the first controller and the anode of the second diode through the sixth resistor, and the inverting end of the first comparator is connected with the first threshold device.
Compared with the prior art, the invention has the beneficial effects that: the frequency conversion switch control protection circuit of the invention controls the power regulating module and the balance control module by the intelligent control module to realize power regulation and power balance work, controls the frequency conversion regulating module to regulate the working power of the direct current motor module by the frequency conversion switch switching module to realize a speed regulation function, and simultaneously carries out overvoltage judgment by the voltage detection module.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a control protection circuit for a variable frequency switch according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a variable frequency switch control protection circuit provided by the embodiment of the invention.
Fig. 3 is a circuit diagram of a connection of a voltage detection module according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a connection of a balance control module according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but 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 one embodiment, referring to fig. 1, a variable frequency switch control protection circuit includes: the power supply module 1, the intelligent control module 2, the power regulation module 3, the balance control module 4, the variable frequency switch switching module 5, the variable frequency regulation module 6, the auxiliary variable frequency module 7, the voltage detection module 8 and the direct current motor module 9;
specifically, the power module 1 is used for accessing alternating current power;
the intelligent control module 2 is connected with the power adjusting module 3, the balance control module 4, the variable frequency switch switching module 5 and the voltage detection module 8, and is used for outputting a first pulse signal and controlling the operation of the power adjusting module 3, outputting a second pulse signal and controlling the operation of the balance control module 4, receiving a first sampling signal output by the power adjusting module 3 and adjusting the duty ratio of the first pulse signal and the second pulse signal according to the received signal, outputting a third pulse signal, outputting a first control signal and controlling the operation of the variable frequency switch switching module, receiving a second sampling signal output by the voltage detection module 8 and adjusting the duty ratio of the third pulse signal according to the received signal;
the power regulation module 3 is connected with the power supply module 1 and is used for receiving a first pulse signal, rectifying, power regulating and filtering the accessed alternating current electric energy, voltage sampling the processed electric energy and transmitting a first sampling signal to the intelligent control module 2;
the balance control module 4 is connected with the power adjustment module 3 and is used for receiving a second pulse signal, storing the input electric energy and performing electric energy compensation operation on the power adjustment module 3;
the variable frequency switch switching module 5 is connected with the variable frequency adjusting module 6, the voltage detecting module 8 and the auxiliary variable frequency module 7, and is used for transmitting a third pulse signal to the variable frequency adjusting module 6, receiving a third control signal output by the voltage detecting module 8 and a first control signal output by the intelligent control module 2 and outputting a second control signal, and performing channel switching through the second control signal and transmitting the third pulse signal to the auxiliary variable frequency module 7;
the variable frequency adjusting module 6 is connected with the power adjusting module 3 and is used for receiving the third pulse signal transmitted by the variable frequency switch switching module 5 and adjusting the power supply frequency;
the auxiliary frequency conversion module 7 is connected with the power regulation module 3 and is used for receiving the third pulse signal and the second control signal transmitted by the frequency conversion switch switching module 5 and regulating the power supply frequency and transmitting the regenerated electric energy generated by the direct current motor module 9;
the voltage detection module 8 is connected with the direct current motor module 9, and is used for detecting voltage and judging overvoltage of the direct current motor module 9 and outputting a second sampling signal and a third control signal, and is used for transmitting the second sampling signal to the intelligent control module 2 and transmitting the third control signal to the intelligent control module 2 and the variable frequency switch switching module 5;
and the direct current motor module 9 is connected with the frequency conversion adjusting module 6 and the auxiliary frequency conversion module 7, and is used for receiving the electric energy transmitted by the frequency conversion adjusting module 6 and the auxiliary frequency conversion module 7 and converting the electric energy into mechanical energy, and converting the mechanical energy into regenerated electric energy during braking.
In a specific embodiment, the power module 1 may adopt a power interface and be connected to an ac power supply; the intelligent control module 2 can adopt a micro-control circuit, integrates a plurality of components such as an arithmetic unit, a controller, a memory, an input/output unit and the like, and realizes the functions of signal processing, data storage, module control, timing control and the like; the power regulating module 3 can adopt a power regulating circuit composed of a power tube, an inductor, a resistor and the like, and is controlled by the intelligent control module 2 to realize DC-DC regulation and voltage sampling work; the balance control module 4 can adopt a balance control circuit formed by a bidirectional regulating circuit to store the input electric energy and compensate the electric energy of the power regulating module 3; the variable frequency switch switching module 5 can adopt a variable frequency switch switching circuit composed of a triode, an analog switch and the like, and the third pulse signals output by the intelligent control module 2 are respectively transmitted to the variable frequency adjusting module 6 and the auxiliary variable frequency module 7 through switching transmission paths; the frequency conversion adjusting module 6 can adopt a frequency conversion adjusting circuit composed of a diode, a power tube and the like to adjust the working frequency of the direct current motor module; the auxiliary frequency conversion module 7 can adopt an auxiliary frequency conversion module 7 formed by power tubes to realize electric energy transmission and adjust the working frequency of the direct current motor module; the voltage detection module 8 can adopt a voltage detection circuit consisting of a voltage sampling circuit and an overvoltage judging circuit, wherein the voltage sampling circuit is used for sampling voltage, and the overvoltage judging circuit is used for judging overvoltage; the dc motor module 9 may be a dc motor, and may convert electromechanical energy.
In another embodiment, referring to fig. 1, 2, 3 and 4, the power module 1 includes a power interface; the power regulation module 3 comprises a first rectifier T1, a first inductor L1, a first power tube Q1, a first diode D1, a first capacitor C1, a first resistor R1 and a second resistor R2; the intelligent control module 2 comprises a first controller U1;
specifically, the first end and the second end of the power interface are respectively connected to the first input end and the second input end of the first rectifier T1, the first output end of the first rectifier T1 is connected to the anode of the first diode D1 and the drain of the first power tube Q1 through the first inductor L1, the cathode of the first diode D1 is connected to the first end of the first capacitor C1 and to one end of the second resistor R2 and the IO2 end of the first controller U1 through the first resistor R1, the source of the first power tube Q1, the second end of the first capacitor C1, the second end of the second resistor R2 and the second output end of the first rectifier T1 are all grounded, and the gate of the first power tube Q1 is connected to the IO1 end of the first controller U1.
In a specific embodiment, the first power tube Q1 may be an N-channel enhancement type MOS tube, and is matched with the first inductor L1, the first inductor L1 and the first capacitor C1 to perform power adjustment; the first resistor R1 and the second resistor R2 are used for voltage sampling; the first controller U1 may adopt an STM32 single-chip microcomputer configured with a field effect transistor driver, so as to improve driving capabilities of the output first pulse signal, second pulse signal and third pulse signal, which are not described herein.
Further, the balance control module 4 includes a second inductor L2, a seventh power transistor Q7, an eighth power transistor Q8, and a second capacitor C2;
specifically, the drain electrode of the seventh power tube Q7 is connected to the source electrode of the eighth power tube Q8 and connected to the first end of the first capacitor C1 through the second inductor L2, the drain electrode of the eighth power tube Q8 is connected to the source electrode of the seventh power tube Q7 and the second end of the first capacitor C1 through the second capacitor C2, and the gate electrode of the seventh power tube Q7 and the gate electrode of the eighth power tube Q8 are respectively connected to the IO7 end and the IO8 end of the first controller U1.
In a specific embodiment, the seventh power tube Q7 and the eighth power tube Q8 may both use N-channel enhancement type MOS tubes, and cooperate with the second inductor L2 to perform bidirectional transmission control of electric energy; the second capacitor C2 may be an energy storage capacitor for storing electric energy and compensating electric energy.
Further, the variable frequency switch switching module 5 includes a first analog switch U2, a third resistor R3, a first power supply VCC1, a first switching tube VT1, a second diode D2, and a third diode D3;
specifically, the IN1 end and the IN2 end of the first analog switch U2 are both connected to the IO3 end of the first controller U1, the OUT1 end and the OUT2 end of the first analog switch U2 are respectively connected to the variable frequency adjustment module 6 and the auxiliary variable frequency module 7, the CTRL2 end of the first analog switch U2 is connected to the base of the first switch tube VT1, the cathode of the second diode D2, the cathode of the third diode D3 and the auxiliary variable frequency module 7, the emitter of the first switch tube VT1 is grounded, the collector of the first switch tube VT1 is connected to the CTRL1 end of the first analog switch U2 and is connected to the first power VCC1 through the third resistor R3, the anode of the second diode D2 is connected to the voltage detection module 8, and the anode of the third diode D3 is connected to the IO4 end of the first controller U1.
IN a specific embodiment, the first analog switch U2 may be a CD4066 chip, where when the CTRL1 end of the first analog switch U2 is at a high level, the IN1 end and the OUT1 end of the first analog switch U2 are controlled to be turned on, and when the CTRL2 end of the first analog switch U2 is at a high level, the IN2 end and the OUT2 end of the first analog switch U2 are controlled to be turned on; the first switching transistor VT1 may be an NPN transistor.
Further, the variable frequency adjustment module 6 includes a second power tube Q2, a sixth diode D6 and a third power tube Q3; the dc motor module 9 includes a dc motor;
specifically, the drain electrode of the second power tube Q2 is connected to the first end of the first capacitor C1, the source electrode of the second power tube Q2 is connected to the anode of the sixth diode D6, the cathode of the sixth diode D6 is connected to the first end of the dc motor, the second end of the dc motor is connected to the drain electrode of the third power tube Q3, the source electrode of the third power tube Q3 is grounded, and the gate electrodes of the second power tube Q2 and the third power tube Q3 are both connected to the OUT1 end of the first analog switch U2.
In a specific embodiment, the second power tube Q2 and the third power tube Q3 may each be an N-channel enhancement type MOS tube.
Further, the auxiliary frequency conversion module 7 comprises a fourth power tube Q4, a fifth power tube Q5 and a sixth power tube Q6;
specifically, the source electrode of the fourth power tube Q4 is connected to the drain electrode of the second power tube Q2, the drain electrode of the fourth power tube Q4 is connected to the drain electrode of the fifth power tube Q5, the source electrode of the fifth power tube Q5 is connected to the first end of the dc motor, the drain electrode of the sixth power tube Q6 is connected to the second end of the dc motor, the source electrode of the sixth power tube Q6 is connected to the source electrode of the third power tube Q3, and the gate electrodes of the fifth power tube Q5 and the sixth power tube Q6 are both connected to the OUT2 end of the first analog switch U2.
In a specific embodiment, the fourth power transistor Q4, the fifth power transistor Q5 and the sixth power transistor Q6 may all be N-channel enhancement type MOS transistors, where the fourth power transistor Q4 is used for power transmission, and the fifth power transistor Q5 and the sixth power transistor Q6 regulate the operating frequency of the input dc motor module 9.
Further, the voltage detection module 8 includes a fourth resistor R4, a fifth resistor R5, a fourth diode D4, a fifth diode D5, a first comparator A1, a first threshold device, and a sixth resistor R6;
specifically, one end of the fourth resistor R4 is connected to the first end of the dc motor, the other end of the fourth resistor R4 is connected to the anode of the fourth diode D4 and the IO5 end of the first controller U1 and is connected to the second end of the dc motor through the fifth resistor R5, the cathode of the fourth diode D4 is connected to the cathode of the fifth diode D5 and the in-phase end of the first comparator A1, the anode of the fifth diode D5 is connected to the output end of the first comparator A1 and is connected to the IO6 pin of the first controller U1 and the anode of the second diode D2 through the sixth resistor R6, and the inverting end of the first comparator A1 is connected to the first threshold device.
In a specific embodiment, the fourth resistor R4 and the fifth resistor R5 form a voltage sampling circuit; the fourth diode D4, the fifth diode D5, the first comparator A1, the sixth resistor R6, and the first threshold device form an overvoltage judging circuit, where the first comparator A1 may use an LM397 comparator, and the first threshold device provides an overvoltage threshold.
In the variable frequency switch control protection circuit, a power interface is connected with an alternating current power supply and connected with the alternating current power supply, a first rectifier T1 carries out rectification treatment, a first controller U1 adjusts the conduction degree of a first power tube Q1, a first inductor L1, a first diode D1 and a first capacitor C1 are matched for carrying out power adjustment, the first resistor R1 and a second resistor R2 sample the adjusted electric energy and transmit the electric energy to the first controller U1, the conduction states of an eighth power tube Q8 and a seventh power tube Q7 are controlled according to sampled signals, the voltage division energy storage and electric energy compensation work of a second capacitor C2 is realized, meanwhile, a CTRL1 end of a first analog switch U2 is in a high level due to a first power supply VCC1 and a third resistor R3, signals output by an IO3 end of the first controller U1 are transmitted to the second power tube Q2 and the third power tube Q3 through the first analog switch U2, in order to adjust the conduction degree of the second power tube Q2 and the third power tube Q3, adjust the working frequency of the input DC motor, complete the rotation speed adjustment, when the IO3 end of the first controller U1 stops outputting signals, the DC motor will be in a braking state and generate regenerated electric energy, at this time, the IO4 end of the first controller U1 will control the fourth power tube Q4 to be conducted, so that the generated regenerated electric energy is transmitted to the first capacitor C1 through the fifth power tube Q5, the fourth power tube Q4 and the sixth power tube Q6, at the same time, the first controller U1 will control the work of the seventh power tube Q7 and the eighth power tube Q8, control the second capacitor C2 to store energy, when the DC motor rotates, the fourth resistor R4 and the fifth resistor R5 detect voltage, when the working voltage of the DC motor is greater than the set overvoltage threshold, the first comparator A1 will control the first switch tube VT1 and the fourth power tube Q4 to be conducted, at this time, the IN2 terminal and the OUT2 terminal of the first analog switch U2 are turned on, and the first controller U1 will drive the fifth power tube Q5 and the sixth power tube Q6 to adjust the power supply frequency, so as to continuously complete the driving of the dc motor.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (3)
1. A control protection circuit of a variable frequency switch is characterized in that,
the variable frequency switch control protection circuit comprises: the device comprises a power supply module, an intelligent control module, a power regulation module, a balance control module, a variable frequency switch switching module, a variable frequency regulation module, an auxiliary variable frequency module, a voltage detection module and a direct current motor module;
the power supply module is used for accessing alternating current electric energy;
the intelligent control module is connected with the power adjusting module, the balance control module, the variable frequency switch switching module and the voltage detection module, and is used for outputting a first pulse signal and controlling the work of the power adjusting module, outputting a second pulse signal and controlling the work of the balance control module, receiving a first sampling signal output by the power adjusting module and adjusting the duty ratio of the first pulse signal and the second pulse signal according to the received signal, outputting a third pulse signal, outputting a first control signal and controlling the work of the variable frequency switch switching module, receiving a second sampling signal output by the voltage detection module and adjusting the duty ratio of the third pulse signal according to the received signal;
the power regulation module is connected with the power supply module and is used for receiving a first pulse signal, rectifying, power regulating and filtering the accessed alternating current electric energy, voltage sampling the processed electric energy and transmitting a first sampling signal to the intelligent control module;
the balance control module is connected with the power regulation module and is used for receiving a second pulse signal, storing the input electric energy and performing electric energy compensation on the power regulation module;
the variable frequency switch switching module is connected with the variable frequency adjusting module, the voltage detecting module and the auxiliary variable frequency module and used for transmitting a third pulse signal to the variable frequency adjusting module, receiving a third control signal output by the voltage detecting module and a first control signal output by the intelligent control module and outputting a second control signal, and switching a passage through the second control signal and transmitting the third pulse signal to the auxiliary variable frequency module;
the variable frequency adjusting module is connected with the power adjusting module and is used for receiving the third pulse signal transmitted by the variable frequency switch switching module and adjusting the power supply frequency;
the auxiliary frequency conversion module is connected with the power regulation module and is used for receiving the third pulse signal and the second control signal transmitted by the frequency conversion switch switching module, regulating the power supply frequency and transmitting the regenerated electric energy generated by the direct current motor module;
the voltage detection module is connected with the direct current motor module, and is used for detecting voltage and judging overvoltage of the direct current motor module, outputting a second sampling signal and a third control signal, transmitting the second sampling signal to the intelligent control module, and transmitting the third control signal to the intelligent control module and the variable frequency switch switching module;
the direct current motor module is connected with the frequency conversion adjusting module and the auxiliary frequency conversion module, and is used for receiving the electric energy transmitted by the frequency conversion adjusting module and the auxiliary frequency conversion module and converting the electric energy into mechanical energy, and converting the mechanical energy into regenerated electric energy when braking;
the power regulation module comprises a first capacitor; the intelligent control module comprises a first controller;
the balance control module comprises a second inductor, a seventh power tube, an eighth power tube and a second capacitor;
the drain electrode of the seventh power tube is connected with the source electrode of the eighth power tube and the first end of the first capacitor through the second inductor, the drain electrode of the eighth power tube is connected with the source electrode of the seventh power tube and the second end of the first capacitor through the second capacitor, and the grid electrode of the seventh power tube and the grid electrode of the eighth power tube are respectively connected with the IO7 end and the IO8 end of the first controller;
the variable frequency switch switching module comprises a first analog switch, a third resistor, a first power supply, a first switching tube, a second diode and a third diode;
the IN1 end and the IN2 end of the first analog switch are both connected with the IO3 end of the first controller, the OUT1 end and the OUT2 end of the first analog switch are respectively connected with the variable frequency regulation module and the auxiliary variable frequency module, the CTRL2 end of the first analog switch is connected with the base electrode of the first switch tube, the cathode of the second diode, the cathode of the third diode and the auxiliary variable frequency module, the emitter of the first switch tube is grounded, the collector of the first switch tube is connected with the CTRL1 end of the first analog switch and is connected with the first power supply through the third resistor, the anode of the second diode is connected with the voltage detection module, and the anode of the third diode is connected with the IO4 end of the first controller;
the frequency conversion adjusting module comprises a second power tube, a sixth diode and a third power tube; the direct current motor module comprises a direct current motor;
the drain electrode of the second power tube is connected with the first end of the first capacitor, the source electrode of the second power tube is connected with the anode of the sixth diode, the cathode of the sixth diode is connected with the first end of the direct current motor, the second end of the direct current motor is connected with the drain electrode of the third power tube, the source electrode of the third power tube is grounded, and the grid electrodes of the second power tube and the third power tube are both connected with the OUT1 end of the first analog switch;
the auxiliary frequency conversion module comprises a fourth power tube, a fifth power tube and a sixth power tube;
the source electrode of the fourth power tube is connected with the drain electrode of the second power tube, the drain electrode of the fourth power tube is connected with the drain electrode of the fifth power tube, the source electrode of the fifth power tube is connected with the first end of the direct current motor, the drain electrode of the sixth power tube is connected with the second end of the direct current motor, the source electrode of the sixth power tube is connected with the source electrode of the third power tube, and the grid electrodes of the fifth power tube and the sixth power tube are both connected with the OUT2 end of the first analog switch.
2. A variable frequency switch control protection circuit according to claim 1, wherein the power module comprises a power interface; the power regulation module further comprises a first rectifier, a first inductor, a first power tube, a first diode, a first resistor and a second resistor;
the first end and the second end of the power interface are respectively connected with the first input end and the second input end of the first rectifier, the first output end of the first rectifier is connected with the anode of the first diode and the drain electrode of the first power tube through the first inductor, the cathode of the first diode is connected with the first end of the first capacitor and connected with one end of the second resistor and the IO2 end of the first controller through the first resistor, the source electrode of the first power tube, the second end of the first capacitor, the second end of the second resistor and the second output end of the first rectifier are grounded, and the grid electrode of the first power tube is connected with the IO1 end of the first controller.
3. The variable frequency switch control protection circuit of claim 2, wherein the voltage detection module comprises a fourth resistor, a fifth resistor, a fourth diode, a fifth diode, a first comparator, a first threshold device, and a sixth resistor;
one end of the fourth resistor is connected with the first end of the direct current motor, the other end of the fourth resistor is connected with the anode of the fourth diode and the IO5 end of the first controller and is connected with the second end of the direct current motor through the fifth resistor, the cathode of the fourth diode is connected with the cathode of the fifth diode and the in-phase end of the first comparator, the anode of the fifth diode is connected with the output end of the first comparator and is connected with the IO6 pin of the first controller and the anode of the second diode through the sixth resistor, and the inverting end of the first comparator is connected with the first threshold device.
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| CN202311523483.9A CN117254722B (en) | 2023-11-16 | 2023-11-16 | Variable frequency switch control protection circuit |
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| CN117254722A (en) | 2023-12-19 |
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