CN213717615U - Power supply control circuit of variable frequency motor - Google Patents
Power supply control circuit of variable frequency motor Download PDFInfo
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- CN213717615U CN213717615U CN202022057797.2U CN202022057797U CN213717615U CN 213717615 U CN213717615 U CN 213717615U CN 202022057797 U CN202022057797 U CN 202022057797U CN 213717615 U CN213717615 U CN 213717615U
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- 238000001514 detection method Methods 0.000 claims abstract description 92
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
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- 238000011897 real-time detection Methods 0.000 description 2
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Abstract
The utility model discloses a inverter motor's power control circuit, including voltage regulation module, voltage detection module, current detection module and PWM signal, voltage detection module and current detection module are connected to voltage regulation module electricity, and current detection module is connected to voltage detection module electricity, and voltage regulation module is in order to be used for adjusting mains voltage's size and export to voltage detection module and current detection module according to the PWM signal, and then whether overvoltage, current detection module detection power overcurrent of messenger's voltage detection module detection power. The utility model discloses an inverter motor's power control circuit, through voltage regulation module according to PWM signal regulation mains voltage's size and output to voltage detection module and current detection module, and then make whether overvoltage, current detection module detection power of voltage detection module detection power overflow, through increasing current closed-loop control and the voltage closed-loop control to power supply unit promptly to the realization plays duplicate protection's purpose to whole inverter motor.
Description
Technical Field
The utility model belongs to the technical field of the direct current frequency conversion, concretely relates to inverter motor's power control circuit.
Background
In the control scheme of the direct current variable frequency motor, overcurrent protection and overvoltage protection are generally arranged to achieve the purpose of stopping outputting control signals to the motor when the motor runs and overcurrent or overvoltage occurs.
However, these two kinds of protection only work on the motor control loop, and once the motor control loop has other faults to affect the judgment of the overcurrent or overvoltage result, the protection does not work.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a inverter motor's power control circuit through increase current closed-loop control and the voltage closed-loop control to power supply unit to the realization plays duplicate protection's purpose to whole inverter motor.
The utility model adopts the technical proposal that:
the utility model provides a variable frequency motor's power control circuit, includes voltage regulation module, voltage detection module, current detection module and PWM signal, voltage regulation module electricity connection voltage detection module and current detection module, current detection module electricity connection current detection module is connected to the voltage detection module, the voltage regulation module is in order to be used for adjusting mains voltage's size and export voltage detection module and current detection module according to the PWM signal, and then makes voltage detection module detect whether excessive pressure, current detection module detect whether the power overflows.
Preferably, the voltage regulation module includes a first triode Q1, a second triode Q2 and a MOS transistor M1, which form a push-pull output circuit, a base of the first triode Q1 is connected in parallel with a base of the second triode Q2, one end of a twenty-eighth resistor R28 and a PWM signal of a voltage regulation port, an emitter of the first triode Q1 is connected in parallel with an emitter of the second triode Q2 and one end of an eleventh resistor R11, a collector of the second triode Q2 and the other end of the twenty-eighth resistor R28 are both grounded, and the other end of the eleventh resistor R11 is connected with a gate of the MOS transistor M1.
Preferably, the voltage detection module includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected in series with one end of the sixth resistor R6, the other end of the fifth resistor R5 and the other end of the sixth resistor R6 are respectively connected to two ends of a load, and a common connection end of the fifth resistor R5 and the sixth resistor R6 is connected to the voltage detection port.
Preferably, the current detection module comprises an operational amplifier U1, the second pin of the operational amplifier U1 is connected in series with a seventeenth resistor R17 and then is connected in parallel with one end of a fourteenth resistor R14 and one end of a fifteenth resistor R15, the third pin of the operational amplifier U1 is connected in series with the twentieth resistor R20 and then connected in parallel with one end of the twelfth resistor R12 and one end of the thirteenth resistor R13, the other end of the fifteenth resistor R15 and the other end of the thirteenth resistor R13 are respectively connected with two ends of an eighth resistor R8, the other end of the fourteenth resistor R14 and the other end of the twelfth resistor R12 are both grounded, the common connection end of the eighth resistor R8 and the thirteenth resistor R13 is connected with the source electrode of the MOS transistor M1, the second pin of the operational amplifier U1 is connected in series with a sixteenth resistor R16 and then connected with the first pin of the operational amplifier U1, the eleventh pin of the operational amplifier U1 is grounded, and the first pin of the operational amplifier U1 is connected with a nineteenth resistor R19 in series and then is connected with a current detection port.
Preferably, the load module further comprises a load module, wherein the load module comprises a load, a sixth capacitor C6 and a seventh capacitor C7, and the load is connected with the sixth capacitor C6 and the seventh capacitor C7 in parallel at two ends for filtering.
Preferably, the voltage regulation module further includes a power supply and a first diode D1, the power supply is connected in parallel with one end of the first capacitor C1, the voltage conversion unit and the drain of the MOS transistor M1, the other end of the first capacitor C1 is grounded, the voltage conversion unit is used for converting the power supply into an internal power supply, the input end of the voltage conversion unit is connected to the power enable port, and the output end of the voltage conversion unit is connected in series with the first diode D1 and then connected to the collector of the first triode Q1.
Preferably, the voltage detection module further includes an inductor L1 and a second diode D2, one end of the inductor L1 is connected to one end of the load, one end of the second diode D2 is connected to the other end of the load, the other end of the inductor L1 and the other end of the second diode D2 are connected in parallel, then are connected in series to a second capacitor C2 and a seventh resistor R7, and then are connected to a collector of the first triode Q1, and a common connection end of the other end of the inductor L1 and the other end of the second diode D2 is further connected to a common connection end of the eighth resistor R8 and the fifteenth resistor R15.
Preferably, the power supply enabling port, the voltage enabling port, the current detection port and the voltage detection port are all connected to the MCU.
Preferably, the first transistor Q1 is an NPN transistor, and the second transistor Q2 is a PNP transistor.
Preferably, the amplification factor of the operational amplifier U1 is the ratio of the resistance of the sixteenth resistor R16 to the resistance of the seventeenth resistor R17.
Compared with the prior art, the utility model discloses an inverter motor's power control circuit, through voltage regulation module according to PWM signal regulation mains voltage's size and output to voltage detection module and current detection module, and then whether make voltage detection module detect the power excessive pressure, whether current detection module detects the power and overflows, through increasing current closed-loop control and the voltage closed-loop control to power part promptly to the realization plays duplicate protection's purpose to whole inverter motor.
Drawings
Fig. 1 is a circuit diagram of a power control circuit of an inverter motor according to an embodiment of the present invention.
Description of the reference numerals
The device comprises a 1-voltage regulation module, a 2-voltage detection module, a 3-current detection module and a 4-load module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
The embodiment of the utility model provides a variable frequency motor's power control circuit, as shown in fig. 1, including voltage regulation module 1, voltage detection module 2, current detection module 3 and PWM signal, voltage detection module 2 and current detection module 3 are connected to voltage regulation module 1 electricity, current detection module 3 is connected to voltage detection module 2 electricity, voltage regulation module 1 is in order to be used for adjusting mains voltage's size and export to voltage detection module 2 and current detection module 3 according to the PWM signal, and then makes voltage detection module 2 detect whether excessive pressure, current detection module 3 detect the power and overflow.
Therefore, the voltage of the power supply is adjusted by the voltage adjusting module 1 according to the PWM signal and is output to the voltage detecting module 2 and the current detecting module 3, so that the voltage detecting module 2 detects whether the power supply is overvoltage or not and the current detecting module 3 detects whether the power supply is overcurrent or not, namely, the current closed-loop control and the voltage closed-loop control of the power supply part are increased, and the purpose of double protection of the whole variable frequency motor is achieved.
Pulse width modulation (PWM signal) is an analog control method, and is a very effective technique for controlling an analog circuit by using digital output of a microprocessor, and the control method is to control the on/off of a switching device of an inverter circuit, so that a series of pulses with equal amplitude are obtained at an output end, and the pulses are used to replace a sine wave or a required waveform. That is, a plurality of pulses are generated in a half cycle of an output waveform, and the equivalent voltage of each pulse is a sine waveform, so that the obtained output is smooth and has few low-order harmonics. The width of each pulse is modulated according to a certain rule, so that the magnitude of the output voltage of the inverter circuit can be changed, and the output frequency can also be changed.
The voltage regulation module 1 comprises a first triode Q1, a second triode Q2 and an MOS transistor M1 which form a push-pull output circuit, wherein the base electrode of the first triode Q1 is connected with the base electrode of the second triode Q2 in parallel, one end of a twenty-eighth resistor R28 and a PWM signal of a voltage regulation port in parallel, the emitter electrode of the first triode Q1 is connected with the emitter electrode of the second triode Q2 in parallel and one end of an eleventh resistor R11 in parallel, the collector electrode of the second triode Q2 and the other end of the twenty-eighth resistor R28 are both grounded, and the other end of the eleventh resistor R11 is connected with the grid electrode of the MOS transistor M1. The first triode Q1 is an NPN triode, and the second triode Q2 is a PNP triode.
Thus, when the PWM signal of the voltage regulation port is at a high level, the first transistor Q1 is turned on, the second transistor Q2 is turned off, the second capacitor C2, the seventh resistor R7, the first transistor Q1, the eleventh resistor R11, the G, S pole of the MOS transistor M1, and the eighth resistor R8 form a path, and at this time, the voltage difference of the G, S pole of the MOS transistor M1 is greater than the turn-on threshold, so the MOS transistor M1 is turned on;
when the PWM signal of the voltage regulation port is low level, the first transistor Q1 is turned off, the second transistor Q2 is turned on, the G pole (gate) of the MOS transistor M1 is connected to ground through the eleventh resistor R11, and the voltage difference between the G, S pole (gate and source) of the MOS transistor M1 is smaller than the turn-on threshold, so the MOS transistor M1 is turned off, thereby realizing system power off.
The voltage detection module 2 comprises a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected with one end of the sixth resistor R6 in series, the other end of the fifth resistor R5 and the other end of the sixth resistor R6 are respectively connected with two ends of a load, and meanwhile, the common connecting end of the fifth resistor R5 and the sixth resistor R6 is connected with a voltage detection port.
Therefore, the voltage across the load is divided by the fifth resistor R5 and the sixth resistor R6, when the voltage across the load is 310V, the voltage at the FB point (i.e., the common connection end of the fifth resistor R5 and the sixth resistor R6) should be 2V, and the micro control unit MCU can determine the deviation value between the voltage across the load and 310V by detecting the deviation value between the voltage at the voltage detection end and 2V.
The current detection module 3 comprises an operational amplifier U1, a second pin of the operational amplifier U1 is connected in series with a seventeenth resistor R17 and then is connected in parallel with one end of a fourteenth resistor R14 and one end of a fifteenth resistor R15, the third pin of the operational amplifier U1 is connected in series with the twentieth resistor R20 and then connected in parallel with one end of the twelfth resistor R12 and one end of the thirteenth resistor R13, the other end of the fifteenth resistor R15 and the other end of the thirteenth resistor R13 are respectively connected with two ends of an eighth resistor R8, the other end of the fourteenth resistor R14 and the other end of the twelfth resistor R12 are both grounded, the common connection end of the eighth resistor R8 and the thirteenth resistor R13 is connected with the source electrode of the MOS transistor M1, the second pin of the operational amplifier U1 is connected in series with a sixteenth resistor R16 and then connected with the first pin of the operational amplifier U1, the eleventh pin of the operational amplifier U1 is grounded, and the first pin of the operational amplifier U1 is connected with a nineteenth resistor R19 in series and then is connected with a current detection port.
Thus, the eighth resistor R8 is a current detection resistor, the voltage at the A, B point (i.e., both ends of the eighth resistor R8) during normal operation is about 310V, so the twelfth resistor R12 and the thirteenth resistor R13, and the fourteenth resistor R14 and the fifteenth resistor R15 are respectively adopted to divide the voltage, the voltage at the C, D point (i.e., the voltage between the common connection end of the twelfth resistor R12 and the thirteenth resistor R13 and the common connection end of the fourteenth resistor R14 and the fifteenth resistor R15) is divided to be within 3V, the divided voltage is respectively input to the a-terminal (the second pin) and the a + terminal (the third pin) of the integrated operational amplifier U1 through the seventeenth resistor R17 and the twentieth resistor R20, the operational amplifier U1 forms a signal amplifier through the sixteenth resistor R16 and the nineteenth resistor R19, the voltage difference at the C, D point is amplified to be the sixteenth resistor R16 and the seventeenth resistor R17, the resistor R5928/R599 times of the resistor R599, the maximum system current is 2A, the maximum voltage difference at the point A, B is 2X 0.05V and the maximum voltage difference at the point CD is 0.1V, the maximum voltage at the current detection port is 3V after the maximum voltage is amplified by an operational amplifier U1, and the micro control unit MCU can indirectly detect the system current by detecting the voltage at the current detection port.
The load module 4 comprises a load, a sixth capacitor C6 and a seventh capacitor C7, wherein the load is connected with the sixth capacitor C6 and the seventh capacitor C7 in parallel.
In this way, by using the sixth capacitor C6 as a high frequency filter and the seventh capacitor C7 as a low frequency filter, both filters ensure that the voltage across the load is smoothed.
In this way, the voltage input to the load after 220V ac mains supply rectified by the dc 310V is used, the first capacitor C1 performs a filtering function, and the dc 310V is converted into an internal 3V power supply by a voltage conversion unit (using a voltage conversion circuit commonly used in the art).
The voltage detection module 2 further comprises an inductor L1 and a second diode D2, one end of the inductor L1 is connected with one end of a load, one end of the second diode D2 is connected with the other end of the load, the other end of the inductor L1 and the other end of the second diode D2 are connected in parallel and then are connected in series with a second capacitor C2 and a seventh resistor R7 and then are connected with a collector of the first triode Q1, and a common connection end of the other end of the inductor L1 and the other end of the second diode D2 is further connected with a common connection end of an eighth resistor R8 and a fifteenth resistor R15.
In this way, by using the second capacitor C2 as a bootstrap capacitor, when the MOS transistor M1 is turned off, the internal 3V power supply charges the second capacitor C2 to 3V through the first diode D1 and the seventh resistor R7, so as to ensure that when the MOS transistor M1 is required to be turned on, the voltage difference of G, S voltage of the MOS transistor M1 is greater than the turn-on threshold, meanwhile, the first diode D1 prevents current from flowing backwards to the power supply, the inductor L1 serves to prevent sudden change of system current, and the second diode D2 serves to provide a freewheeling path for the inductor L1 when the MOS transistor M1 is turned off.
And the power supply enabling port, the voltage enabling port, the current detection port and the voltage detection port are all connected to the MCU.
Like this, all be connected to little the control unit MCU through power enable port, voltage enable port, current detection port and voltage detection port, through little the control unit MCU to power enable port and voltage enable port send signal, end the detected signal of current detection port and voltage detection port through little the control unit MCU simultaneously, this application adopts 3.3V's little the control unit MCU.
When the direct Current variable frequency motor system of this application moves, the little the control unit MCU enables the inside 3V power of port Enable Signal end low level messenger through output power, frequency and duty cycle through control Voltage regulation port PWM Signal adjust load both ends Voltage size, simultaneously, through Current detection port Current Check real-time detection system Current size, through Voltage detection port Voltage Check real-time detection system Voltage size, form 2 kinds of closed-loop control:
a. regulating the voltage output to the load according to the system current;
b. and judging according to the voltage of the system, if the voltage is overvoltage, outputting a 3V voltage inside the power supply enabling port Enable Signal high-level switch-off, and further realizing system power failure.
The utility model discloses an inverter motor's power control circuit, through voltage regulation module according to PWM signal regulation mains voltage's size and output to voltage detection module and current detection module, and then make whether overvoltage, current detection module detection power overcurrent of voltage detection module detection power to realize duplicate protection to inverter frequency motor control system: the existing current closed-loop control and voltage closed-loop control of the overcurrent and overvoltage protection plus the power supply part in the motor control process is provided with a power supply enabling port, a voltage adjusting port, a current detecting port and a voltage detecting port, so that the dynamic adjustment of a power supply in the working process of a variable frequency motor system can be realized through a Micro Control Unit (MCU).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a variable frequency motor's power control circuit, its characterized in that, includes voltage regulation module (1), voltage detection module (2), current detection module (3) and PWM signal, voltage regulation module (1) electricity is connected voltage detection module (2) and current detection module (3), current detection module (3) are connected to voltage detection module (2) electricity, voltage regulation module (1) is in order to be used for adjusting mains voltage's size and export to voltage detection module (2) and current detection module (3) according to the PWM signal, and then makes whether overvoltage, current detection module (3) detect the power and overflow voltage detection module (2).
2. The power control circuit of the inverter motor according to claim 1, wherein the voltage regulation module (1) comprises a first transistor Q1 and a second transistor Q2 constituting a push-pull output circuit, and a MOS transistor M1, wherein a base of the first transistor Q1 is connected in parallel with a base of the second transistor Q2, one end of a twenty-eighth resistor R28, and a PWM signal of a voltage regulation port, an emitter of the first transistor Q1 is connected in parallel with an emitter of the second transistor Q2 and one end of an eleventh resistor R11, a collector of the second transistor Q2 and the other end of the twenty-eighth resistor R28 are both grounded, and the other end of the eleventh resistor R11 is connected with a gate of the MOS transistor M1.
3. The power control circuit of the variable frequency motor according to claim 1, wherein the voltage detection module (2) comprises a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected in series with one end of the sixth resistor R6, the other ends of the fifth resistor R5 and the sixth resistor R6 are respectively connected with two ends of a load, and a common connection end of the fifth resistor R5 and the sixth resistor R6 is connected with the voltage detection port.
4. The power control circuit of the inverter motor according to claim 2 or 3, wherein the current detection module (3) comprises an operational amplifier U1, a second pin of the operational amplifier U1 is connected in series with a seventeenth resistor R17 and then connected in parallel with one end of a fourteenth resistor R14 and one end of a fifteenth resistor R15, a third pin of the operational amplifier U1 is connected in series with a twentieth resistor R20 and then connected in parallel with one end of a twelfth resistor R12 and one end of a thirteenth resistor R13, the other end of the fifteenth resistor R15 and the other end of a thirteenth resistor R13 are respectively connected with two ends of an eighth resistor R8, the other end of the fourteenth resistor R14 and the other end of the twelfth resistor R12 are both grounded, a common connection end of the eighth resistor R8 and the thirteenth resistor R13 is connected with a source of a MOS transistor M1, a second pin of the operational amplifier U1 is connected in series with a sixteenth resistor R16 and then connected with a first pin of the operational amplifier U1, the eleventh pin of the operational amplifier U1 is grounded, and the first pin of the operational amplifier U1 is connected with a nineteenth resistor R19 in series and then is connected with a current detection port.
5. The power control circuit of the variable frequency motor according to any one of claims 1 to 3, further comprising a load module (4), wherein the load module (4) comprises a load, a sixth capacitor C6 and a seventh capacitor C7, and the load is connected with the sixth capacitor C6 and the seventh capacitor C7 in parallel for filtering.
6. The power control circuit of the inverter motor according to claim 4, wherein the voltage regulation module (1) further comprises a power source and a first diode D1, the power source is connected in parallel with one end of a first capacitor C1, a voltage conversion unit and the drain electrode of the MOS transistor M1, the other end of the first capacitor C1 is grounded, the voltage conversion unit is used for converting the power source into an internal power source, the input end of the voltage conversion unit is connected with a power source enabling port, and the output end of the voltage conversion unit is connected with the collector electrode of the first triode Q1 after being connected with the first diode D1 in series.
7. The power control circuit of the inverter motor according to claim 4, wherein the voltage detection module (2) further comprises an inductor L1 and a second diode D2, one end of the inductor L1 is connected to one end of a load, one end of the second diode D2 is connected to the other end of the load, the other end of the inductor L1 and the other end of the second diode D2 are connected in parallel, then connected in series with a second capacitor C2 and a seventh resistor R7, and then connected with a collector of a first triode Q1, and a common connection end of the other end of the inductor L1 and the other end of the second diode D2 is further connected with a common connection end of an eighth resistor R8 and a fifteenth resistor R15.
8. The power control circuit of the inverter motor according to claim 6, wherein the power enable port, the voltage enable port, the current detection port and the voltage detection port are all connected to a Micro Control Unit (MCU).
9. The power control circuit of the inverter motor according to claim 2, wherein the first transistor Q1 is an NPN transistor, and the second transistor Q2 is a PNP transistor.
10. The power control circuit of the inverter motor according to claim 4, wherein the amplification factor of the operational amplifier U1 is the ratio of the resistance of the sixteenth resistor R16 to the resistance of the seventeenth resistor R17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022057797.2U CN213717615U (en) | 2020-09-18 | 2020-09-18 | Power supply control circuit of variable frequency motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022057797.2U CN213717615U (en) | 2020-09-18 | 2020-09-18 | Power supply control circuit of variable frequency motor |
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| Publication Number | Publication Date |
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| CN213717615U true CN213717615U (en) | 2021-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022057797.2U Active CN213717615U (en) | 2020-09-18 | 2020-09-18 | Power supply control circuit of variable frequency motor |
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| CN (1) | CN213717615U (en) |
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