CN217607727U - Alternating current asynchronous motor and stepless speed regulation circuit thereof - Google Patents
Alternating current asynchronous motor and stepless speed regulation circuit thereof Download PDFInfo
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- CN217607727U CN217607727U CN202221065094.7U CN202221065094U CN217607727U CN 217607727 U CN217607727 U CN 217607727U CN 202221065094 U CN202221065094 U CN 202221065094U CN 217607727 U CN217607727 U CN 217607727U
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Abstract
The utility model provides an alternating current asynchronous machine and stepless speed regulation circuit thereof, through the rectification return circuit with the alternating current sinusoidal voltage rectification that has positive and negative semi-cycle of input become unipolar direct current voltage, filter behind the rectification, make the voltage after the rectification be 2 times the direct current steamed bread wave of mains frequency, then, through H bridge drive circuit, the steamed bread wave direct current voltage of half cycle carries out pulse width modulation, stop after zero crossing signal comes, treat zero crossing signal after, switch over H bridge arm and carry out pulse width modulation to another semi-cycle, so use zero crossing signal to switch over the phase place repeatedly as the boundary point, the alternating current voltage who has sinusoidal profile through pulse width modulation has finally been synthesized on the load, solve the speed governing to the motor among the prior art and have with high costs, and voltage distortion, the problem of power factor decline.
Description
Technical Field
The utility model relates to a motor control field, in particular to exchange asynchronous machine and stepless speed control circuit thereof.
Background
The alternating current asynchronous motor is widely applied to industrial equipment and various household appliances, and electric equipment such as an electric fan, an air conditioner, an air purifier, a dehumidifier and the like is common in the field of household appliances. No matter which field is applied, the problem of speed regulation needs to be faced, and the speed regulation of the alternating current asynchronous motor has multiple modes, and the traditional speed regulation mode is generally as follows:
(1) The winding of the motor is provided with a plurality of taps, and an external control circuit performs the switching of the winding through an electronic or mechanical switch such as a relay, a silicon controlled rectifier and the like so as to achieve the purpose of speed regulation.
(2) An inductor with a plurality of taps is connected in series in a power supply loop of the motor, and an electronic or mechanical switch is used for switching windings so as to achieve the purpose of connecting different inductors in series to play a role in speed regulation.
(3) The bidirectional controllable silicon is used for controlling the conduction angle so as to play a role in speed regulation.
For (1) and (2), because the motor adopts a multi-tap mode, the process of the motor is complex when a coil is wound, and meanwhile, for a gear with lower speed, the winding needs to be wound by more turns, so that more copper wires can be used, the cost of the motor is higher, and meanwhile, a gear switching circuit also needs more control circuits, so the cost of the control circuit is higher. For (3), because the mode of adjusting the conduction angle by adopting the silicon controlled rectifier is adopted, the voltage supplied to the motor winding for working is not a complete sine wave voltage, but an incomplete waveform cut off from a zero crossing point to the conduction angle, the voltage wave generates larger distortion and has very high harmonic wave components, the power factor can be obviously reduced, the motor can generate higher electromagnetic sound during operation, and the sleep quality of people can be influenced for electric appliances needing to be used during sleep at night.
In view of this, the present application is presented.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an alternating current asynchronous machine and stepless speed regulation circuit thereof aims at solving the problem that has with high costs and voltage distortion, power factor decline to the speed governing of motor among the prior art.
The utility model discloses a first embodiment provides an exchange asynchronous machine's stepless speed regulation circuit, include: the device comprises a controller, a rectifying circuit, a zero-crossing detection circuit, an H-bridge driving circuit, a first driving circuit, a second driving circuit, a first electronic switch and a second electronic switch;
the input end of the rectifying loop is used for connecting an alternating current power supply, the output end of the rectifying loop is electrically connected with the input end of the zero-crossing detection loop, and the output end of the zero-crossing detection loop is electrically connected with the input end of the controller;
the output end of the rectification loop is electrically connected with the input end of the H-bridge driving circuit, and the output end of the H-bridge driving circuit is used for connecting an alternating current asynchronous motor;
a first phase signal output end of the controller is electrically connected with a first control end of the H-bridge drive circuit through the first drive circuit, and a second phase signal output end of the controller is electrically connected with a second control end of the H-bridge drive circuit through the second drive circuit;
the driving signal output end of the controller is electrically connected with the input end of the first driving circuit through the first electronic switch, and the driving signal output end of the controller is electrically connected with the input end of the second driving circuit through the second electronic switch.
Preferably, the H-bridge driving circuit includes: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor and a first resistor;
the first end of the first resistor is electrically connected with the output end of the rectifying circuit, the D pole of the first MOS tube and the D pole of the second MOS tube are electrically connected with the second end of the first resistor, the S pole of the first MOS tube is electrically connected with the D pole of the third MOS tube, the S pole of the second MOS tube is electrically connected with the D pole of the fourth MOS tube, and the S pole of the third MOS tube is electrically connected with the S pole of the fourth MOS tube;
the output end of the first driving circuit is electrically connected with the G pole of the first MOS tube and the G pole of the third MOS tube, and the output end of the second driving circuit is electrically connected with the G pole of the second MOS tube and the G pole of the fourth MOS tube.
Preferably, the first MOS transistor, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor are N-channel MOS transistors.
Preferably, the zero-crossing detection circuit includes: the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the first triode;
the output end of the rectification loop is electrically connected with the first end of the second resistor, the second end of the second resistor is electrically connected with the first end of the third resistor, the second end of the third resistor is electrically connected with the B electrode of the first triode through the fourth resistor, the B electrode of the first triode is grounded through the fifth resistor, the E electrode of the first triode is grounded, the C electrode of the first triode is connected with the power supply through the sixth resistor, and the C electrode of the first triode is electrically connected with the input end of the controller.
Preferably, the first driving circuit includes: the circuit comprises a first driving chip, a first diode, a seventh resistor, an eighth resistor and a first capacitor;
the HO end of the first driving chip is electrically connected with the G pole of the first MOS tube through the seventh resistor, the LO end of the first driving chip is electrically connected with the G pole of the third MOS tube through the eighth resistor, the VB end of the first driving chip is electrically connected with the S pole of the first MOS tube through the first capacitor, the VS end of the first driving chip is electrically connected with the S pole of the first MOS tube and the D pole of the third MOS tube, and the VS end of the first driving chip is electrically connected with the input end of the alternating current asynchronous motor;
the VCC end of the first driving chip is electrically connected with the anode of the first diode, the VB end of the first driving chip is electrically connected with the cathode of the first diode, the first phase output end of the controller is electrically connected with the HIN end of the first driving chip, and the output end of the first electronic switch is electrically connected with the LIN end of the first driving chip.
Preferably, the second driving circuit includes: the second driving chip, a second diode, a ninth resistor, a tenth resistor and a second capacitor;
the HO end of the second driving chip is electrically connected with the G pole of the second MOS tube through the ninth resistor, the LO end of the second driving chip is electrically connected with the G pole of the fourth MOS tube through the tenth resistor, the VB end of the second driving chip is electrically connected with the S pole of the second MOS tube through the first capacitor, the VS end of the second driving chip is electrically connected with the S pole of the second MOS tube and the D pole of the fourth MOS tube, and the VS end of the second driving chip is electrically connected with the input end of the alternating current asynchronous motor;
the VCC end of the second driving chip is electrically connected with the anode of the second diode, the VB end of the second driving chip is electrically connected with the cathode of the second diode, the second phase output end of the controller is electrically connected with the HIN end of the second driving chip, and the output end of the second electronic switch is electrically connected with the LIN end of the second driving chip.
Preferably, the first electronic switch comprises a second triode, a third diode, an eleventh resistor and a twelfth resistor;
the B pole of the second triode is electrically connected with the C pole of the third triode through the eleventh resistor, the E pole of the third triode is grounded, the B pole of the third triode is electrically connected with the first phase output end of the controller through the twelfth resistor, the C pole of the second triode is electrically connected with the positive pole of the third diode, and the E pole of the second triode is electrically connected with the negative pole of the diode;
the C electrode of the second triode is electrically connected with the LIN end of the first driving chip, and the E electrode of the second triode is electrically connected with the driving signal output end of the controller.
Preferably, the second electronic switch includes a fourth triode, a fifth triode, a fourth diode, a thirteenth resistor and a fourteenth resistor;
a B pole of the fourth triode is electrically connected with a C pole of the fifth triode through the thirteenth resistor, an E pole of the fifth triode is grounded, a B pole of the fifth triode is electrically connected with the second phase signal output end of the controller through the fourteenth resistor, a C pole of the fourth triode is electrically connected with an anode of the fourth diode, and an E pole of the fourth triode is electrically connected with the C pole of the fifth triodeFour diodesThe negative electrodes of the two electrodes are electrically connected;
and the C electrode of the fourth triode is electrically connected with the LIN end of the second driving chip, and the E electrode of the fourth triode is electrically connected with the driving signal output end of the controller.
The second embodiment of the utility model provides a stepless speed regulation method for AC asynchronous motor, include
Acquiring a detection signal acquired by the zero-crossing detection circuit;
after the first rising edge of the zero-crossing signal is judged to arrive according to the detection signal, the driving signal, the first phase signal and the second phase signal are cleared, after the first falling edge of the zero-crossing signal is judged to arrive according to the detection signal, the driving signal is started, the first phase signal is set high, and positive half-cycle voltage matched with the required rotating speed of the alternating current asynchronous motor is output through an H-bridge driving circuit;
after judging that the second rising edge of the zero-crossing signal arrives according to the detection signal, clearing the driving signal, the first phase signal and the second phase signal, starting the driving signal and setting the second phase signal high after judging that the second falling edge of the zero-crossing signal arrives according to the detection signal, and outputting negative half-cycle voltage matched with the required rotating speed of the alternating current asynchronous motor through an H-bridge driving circuit; wherein the positive half cycle voltage and the negative half cycle voltage are used for driving the alternating current asynchronous motor.
Preferably, the rotating speed of the alternating current asynchronous motor can be changed according to the duty ratio of the driving signal.
The utility model discloses the third embodiment provides an exchange asynchronous machine, including motor body and as above arbitrary one exchange asynchronous machine's stepless speed control circuit, wherein, H bridge drive circuit's output with motor body's input electrical connection.
Based on the utility model provides a pair of exchange asynchronous machine and stepless speed control circuit thereof, through the rectification return circuit with the alternating current sinusoidal voltage rectification that has positive and negative half cycle of input become unipolar's direct current voltage, filter after the rectification, make the voltage after the rectification be 2 times the direct current steamed bread wave of mains frequency, then, through H bridge drive circuit, carry out pulse width modulation to the steamed bread wave direct current voltage of half cycle, come the back and stop when zero cross signal, treat that zero cross signal is past, switch H bridge arm carries out pulse width modulation to another half cycle, so use zero cross signal to switch over the phase place repeatedly as the boundary point, finally synthesized the alternating current voltage that has sinusoidal profile through pulse width modulation on the load, solve among the prior art to the speed governing of motor have with high costs, and voltage distortion, the problem of power factor decline.
Drawings
Fig. 1 is a schematic block diagram of an ac asynchronous motor and a stepless speed regulation circuit thereof according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an ac asynchronous motor and its stepless speed regulation circuit provided by the embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a waveform adjustment variation provided by an embodiment of the present invention;
fig. 4 is a schematic flow chart of an ac asynchronous motor and its stepless speed regulation method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some, and not all embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at 8230; \8230;" or "when 8230; \8230;" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (a stated condition or event)" may be interpreted as "upon determining" or "in response to determining" or "upon detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)", depending on the context.
In the embodiments, the references to "first \ second" merely distinguish similar objects and do not represent a specific ordering for the objects, and it is to be understood that "first \ second" may interchange a specific order or sequence where permitted. It should be understood that "first \ second" distinct objects may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced in sequences other than those illustrated or described herein.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
The utility model discloses an alternating current asynchronous machine and stepless speed regulation circuit thereof aims at solving the problem that has with high costs and voltage distortion, power factor decline to the speed governing of motor among the prior art.
Referring to fig. 1 and 2, a first embodiment of the present invention provides a stepless speed regulating circuit for an ac asynchronous motor, including: the circuit comprises a controller 1, a rectifying circuit 2, a zero-crossing detection circuit 3, an H-bridge driving circuit 5, a first driving circuit 4, a second driving circuit 6, a first electronic switch 8 and a second electronic switch 7;
the input end of the rectifying circuit 2 is used for connecting an alternating current power supply, the output end of the rectifying circuit 2 is electrically connected with the input end of the zero-crossing detection circuit 3, and the output end of the zero-crossing detection circuit 3 is electrically connected with the input end of the controller 1;
the output end of the rectification loop 2 is electrically connected with the input end of the H-bridge driving circuit 5, and the output end of the H-bridge driving circuit 5 is used for connecting an alternating current asynchronous motor;
a first phase signal output end of the controller 1 is electrically connected with a first control end of the H-bridge drive circuit 5 through the first drive circuit 4, and a second phase signal output end of the controller 1 is electrically connected with a second control end of the H-bridge drive circuit 5 through the second drive circuit 6;
the driving signal output end of the controller 1 is electrically connected with the input end of the first driving circuit 4 through the first electronic switch 8, and the driving signal output end of the controller 1 is electrically connected with the input end of the second driving circuit 6 through the second electronic switch 7.
It should be noted that, in this embodiment, an input ac sinusoidal voltage with positive and negative half cycles is rectified into a unipolar dc voltage by a rectification circuit 2, the rectified dc voltage is not filtered after rectification, so that the rectified voltage is a dc steamed bread wave 2 times the power frequency, and then divided into two paths, one path passes through the zero-crossing detection circuit 3, and the other path passes through the H-bridge driving circuit 5, wherein the controller 1 detects a zero-crossing signal and corresponding rising and falling edges by the zero-crossing detection circuit 3, when the first zero-crossing signal arrives, the first driving circuit 4, the second driving circuit 6, the first electronic switch 8, and the second electronic switch 7 are switched, so that the steamed bread wave dc voltage of the upper half cycle of the H-bridge driving circuit 5 is pulse width modulated, when the next zero-crossing signal arrives, the first driving circuit 4, the second driving circuit 6, the first electronic switch 8, and the second electronic switch 7 are switched, so that the zero-crossing signal of the lower half cycle of the H-bridge driving circuit 5 is pulse width modulated, so that the ac sinusoidal voltage of the lower half cycle is subjected to a high-frequency modulation, and the problem of the existing load is solved.
Referring to fig. 2, in one possible embodiment of the present invention, the H-bridge driving circuit 5 includes: the MOS transistor comprises a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4 and a first resistor R1;
a first end of the first resistor R1 is electrically connected to an output end of the rectifier circuit 2, a D-pole of the first MOS transistor Q1 and a D-pole of the second MOS transistor Q2 are electrically connected to a second end of the first resistor R1, an S-pole of the first MOS transistor Q1 is electrically connected to a D-pole of the third MOS transistor Q3, an S-pole of the second MOS transistor Q2 is electrically connected to a D-pole of the fourth MOS transistor Q4, and an S-pole of the third MOS transistor Q3 is electrically connected to an S-pole of the fourth MOS transistor Q4;
the output end of the first driving circuit 4 is electrically connected with the G pole of the first MOS transistor Q1 and the G pole of the third MOS transistor Q3, and the output end of the second driving circuit 6 is electrically connected with the G pole of the second MOS transistor Q2 and the G pole of the fourth MOS transistor Q4.
It should be noted that the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3, and the fourth MOS transistor Q4 form an H bridge, and a rectified power supply is input to the H bridge through the first resistor R1, and outputs a voltage capable of adjusting the rotation speed of the ac asynchronous motor through the H bridge. In other embodiments, other circuit structures may also be adopted to form the H-bridge driving circuit 5, which is not specifically limited herein, but these schemes are all within the protection scope of the present invention.
It should be noted that the first MOS transistor, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor may be N-channel MOS transistors.
In a possible embodiment of the present invention, the zero-crossing detection circuit 3 includes: the circuit comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first triode N1;
the output end of the rectifier circuit 2 is electrically connected with the first end of the second resistor R2, the second end of the second resistor R2 is electrically connected with the first end of the third resistor R3, the second end of the third resistor R3 is electrically connected with the B pole of the first triode N1 through the fourth resistor R4, the B pole of the first triode N1 is grounded through the fifth resistor R5, the E pole of the first triode N1 is grounded, the C pole of the first triode N1 is connected with the power supply through the sixth resistor R6, and the C pole of the first triode N1 is electrically connected with the input end of the controller 1.
It should be noted that, after the alternating current power supply is rectified by the rectifying circuit 2, the zero-cross detection circuit 3 outputs a detection signal to the controller 1, and the controller 1 may determine, by the detection signal, a zero-cross point, a rising edge after the zero-cross point, and a falling edge after the rising edge, and so on. In other embodiments, other circuit structures may also be adopted to form the zero-crossing detection circuit 3, which is not specifically limited herein, but these schemes are all within the protection scope of the present invention.
In a possible embodiment of the present invention, the first driving circuit 4 includes: the circuit comprises a first driving chip U1, a first diode D1, a seventh resistor R7, an eighth resistor R8 and a first capacitor C1;
the HO end of the first driving chip U1 is electrically connected to the G pole of the first MOS transistor Q1 through the seventh resistor R7, the LO end of the first driving chip U1 is electrically connected to the G pole of the third MOS transistor Q3 through the eighth resistor R8, the VB end of the first driving chip U1 is electrically connected to the S pole of the first MOS transistor Q1 through the first capacitor C1, the VS end of the first driving chip U1 is electrically connected to the S pole of the first MOS transistor Q1 and the D pole of the third MOS transistor Q3, and the VS end of the first driving chip U1 is electrically connected to the input end of the ac asynchronous motor;
VCC end of first driver chip U1 with first diode D1's positive pole electrical connection, VB end of first driver chip U1 with first diode D1's negative pole electrical connection, controller 1's first phase place output with first driver chip U1's HIN end electrical connection, first electronic switch 8's output with first driver chip U1's LIN end electrical connection.
In a possible embodiment of the present invention, the second driving circuit 6 includes: the driving circuit comprises a second driving chip U2, a second diode D2, a ninth resistor R9, a tenth resistor R10 and a second capacitor C2;
the HO end of the second driving chip U2 is electrically connected to the G pole of the second MOS transistor Q2 through the ninth resistor R9, the LO end of the second driving chip U2 is electrically connected to the G pole of the fourth MOS transistor Q4 through the tenth resistor R10, the VB end of the second driving chip U2 is electrically connected to the S pole of the second MOS transistor Q2 through the first capacitor C1, the VS end of the second driving chip U2 is electrically connected to the S pole of the second MOS transistor Q2 and the D pole of the fourth MOS transistor Q4, and the VS end of the second driving chip U2 is electrically connected to the input end of the ac asynchronous motor;
the VCC end of the second driver chip U2 is electrically connected with the anode of the second diode D2, the VB end of the second driver chip U2 is electrically connected with the cathode of the second diode D2, the second phase output end of the controller 1 is electrically connected with the HIN end of the second driver chip U2, and the output end of the second electronic switch 7 is electrically connected with the LIN end of the second driver chip U2.
In a possible embodiment of the present invention, the first electronic switch 8 includes a second transistor N2, a third transistor N3, a third diode D3, an eleventh resistor R11, and a twelfth resistor R12;
a B electrode of the second triode N2 is electrically connected with a C electrode of the third triode N3 through the eleventh resistor R11, an E electrode of the third triode N3 is grounded, a B electrode of the third triode N3 is electrically connected with the first phase output end of the controller 1 through the twelfth resistor R12, a C electrode of the second triode N2 is electrically connected with an anode of the third diode D3, and an E electrode of the second triode N2 is electrically connected with a cathode of the diode;
the C electrode of the second triode N2 is electrically connected with the LIN end of the first driving chip U1, and the E electrode of the second triode N2 is electrically connected with the driving signal output end of the controller 1.
In a possible embodiment of the present invention, the second electronic switch 7 includes a fourth transistor N4, a fifth transistor N5, a fourth diode D4, a thirteenth resistor R13, and a fourteenth resistor R14;
a pole B of the fourth transistor N4 is electrically connected to a pole C of the fifth transistor N5 through the thirteenth resistor R13, a pole E of the fifth transistor N5 is grounded, a pole B of the fifth transistor N5 is electrically connected to the second phase signal output terminal of the controller 1 through the fourteenth resistor R14, a pole C of the fourth transistor N4 is electrically connected to an anode of the fourth diode D4, and a pole E of the fourth transistor N4 is electrically connected to the pole E of the fourth transistor N4Four diodesIs electrically connected with the cathode;
the C electrode of the fourth triode N4 is electrically connected with the LIN end of the second driving chip U2, and the E electrode of the fourth triode N4 is electrically connected with the driving signal output end of the controller 1.
It is following to the operating principle of the embodiment of the utility model carries out brief description:
the detection signal is sent to the input end of the controller 1 through the zero-crossing detection loop 3, and when the controller 1 does not detect a zero-crossing signal according to the detection signal, the controller 1 controls the driving signal, the first phase signal and the second phase signal to be completely cleared;
after the controller 1 detects that the rising edge of the zero-crossing signal comes according to the detection signal, the controller 1 controls all the driving signal, the first phase signal and the second phase signal to be cleared;
after the controller 1 detects that the falling edge of the zero-crossing signal comes according to the detection signal, the controller 1 sends a driving signal and sets the first phase signal high, wherein a high level signal is sent to a HIN pin of the first driving chip U1, and at the same time, the high level signal controls to open a first electronic switch 8 composed of the second triode N2, the third triode N3, the third diode D3, the eleventh resistor R11 and the twelfth resistor R12, and the driving signal is sent to a LIN pin of the second driving chip U2 through the fourth triode N4, so that the first MOS transistor Q1 is turned on under the driving of the first driving chip U1, and the fourth MOS transistor Q4 is in a switch-on state under the driving of the second driving chip U2, so as to synthesize a positive half-cycle waveform, which is shown in fig. 3.
After the controller 1 detects the rising edge of the zero-crossing signal again according to the detection signal, the controller 1 controls the driving signal, the first phase signal and the second phase signal to be kept completely zero;
after the controller 1 detects the falling edge of the zero-crossing signal again according to the detection signal, the controller 1 sends a driving signal and sets the second phase signal high, wherein the high level signal is sent to a HIN pin of a second driving chip U2, and at the same time, the high level signal controls to open a second electronic switch 7 composed of a fourth triode N4, a fifth triode N5, a fourth diode D4, a thirteenth resistor R13 and a fourteenth resistor R14, and the driving signal is sent to a LIN pin of the first driving chip U1 through the second triode N2, so that the second MOS transistor Q2 is turned on under the driving of the second driving chip U2, and the third MOS transistor Q3 is in a switch-on state under the driving of the first driving chip U1, so as to synthesize a waveform of a negative half cycle.
It should be noted that, the positive and negative half-cycles of the waveform synthesize the ac voltage with a sinusoidal profile to supply the motor with the ac voltage, which can easily adjust the rotation speed of the motor by adjusting the duty ratio of the driving signal (e.g., PWM signal), and the number of adjustment steps of the rotation speed depends on the resolution of PWM. In this embodiment, the controller 1 may be an STM 32-series single chip microcomputer, but is not limited thereto, and may also perform processing by using a PLC.
The utility model discloses at least, include following beneficial effect:
1. the power factor is high, the outline of the waveform is still sine wave, so the power factor can still be kept above 0.9, and the electric energy utilization rate is high;
2. the waveform coefficient is good, the noise is low, and because no obvious waveform distortion is generated, the waveform coefficient is high, the harmonic component is less, and the motor does not have electromagnetic sound during working, so that the user experience feeling is very good when the motor is used for household appliances.
3. The cost is low, and the cost of the motor can be obviously reduced due to the adoption of the single-gear motor.
Referring to fig. 4, a second embodiment of the present invention provides a stepless speed regulation method for an ac asynchronous motor, including
S101, acquiring a detection signal acquired by the zero-crossing detection circuit 3;
s102, after judging that the first rising edge of the zero-crossing signal arrives according to the detection signal, clearing the driving signal, the first phase signal and the second phase signal, starting the driving signal and setting the first phase signal high after judging that the first falling edge of the zero-crossing signal arrives according to the detection signal, and outputting positive half-cycle voltage matched with the required rotating speed of the alternating current asynchronous motor through the H-bridge driving circuit 5;
s103, after judging that the second rising edge of the zero-crossing signal arrives according to the detection signal, clearing the driving signal, the first phase signal and the second phase signal, starting the driving signal and setting the second phase signal high after judging that the second falling edge of the zero-crossing signal arrives according to the detection signal, and outputting a negative half-cycle voltage matched with the required rotating speed of the alternating current asynchronous motor through the H-bridge driving circuit 5; wherein the positive half cycle voltage and the negative half cycle voltage are used for driving the alternating current asynchronous motor.
Preferably, the rotation speed of the alternating current asynchronous motor can be changed according to the duty ratio of the driving signal.
The third embodiment of the utility model provides an alternating current asynchronous machine, including motor body and as above arbitrary one alternating current asynchronous machine's stepless speed regulation circuit, wherein, H bridge drive circuit 5's output with motor body's input electrical connection.
Based on the utility model provides a pair of exchange asynchronous machine and stepless speed control circuit thereof, through rectifier circuit 2 with the AC sinusoidal voltage rectification one-polar that has positive and negative half cycle of input, filtering is not carried out after the rectification, make the voltage after the rectification be 2 times the direct current steamed bread wave of mains frequency, then, through H bridge drive circuit 5, carry out pulse width modulation to the steamed bread wave direct current voltage of half cycle, come the back when zero crossing signal stops, treat that zero crossing signal crosses the back, switch over H bridge arm and carry out pulse width modulation to another half cycle, so use zero crossing signal to switch over the phase place repeatedly as the boundary point, the AC voltage who has sinusoidal profile through pulse width modulation has finally been synthesized on the load, solve among the prior art to the speed governing of motor with high costs, and voltage distortion, the problem of power factor decline.
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 (9)
1. A stepless speed regulation circuit of an alternating current asynchronous motor is characterized by comprising: the device comprises a controller, a rectifying circuit, a zero-crossing detection circuit, an H-bridge driving circuit, a first driving circuit, a second driving circuit, a first electronic switch and a second electronic switch;
the input end of the rectification loop is used for being connected with an alternating current power supply, the output end of the rectification loop is electrically connected with the input end of the zero-crossing detection loop, and the output end of the zero-crossing detection loop is electrically connected with the input end of the controller;
the output end of the rectification loop is electrically connected with the input end of the H-bridge driving circuit, and the output end of the H-bridge driving circuit is used for connecting an alternating current asynchronous motor;
a first phase signal output end of the controller is electrically connected with a first control end of the H-bridge drive circuit through the first drive circuit, and a second phase signal output end of the controller is electrically connected with a second control end of the H-bridge drive circuit through the second drive circuit;
the driving signal output end of the controller is electrically connected with the input end of the first driving circuit through the first electronic switch, and the driving signal output end of the controller is electrically connected with the input end of the second driving circuit through the second electronic switch.
2. The stepless speed regulation circuit of an alternating current asynchronous motor according to claim 1, characterized in that the H-bridge drive circuit comprises: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor and a first resistor;
the first end of the first resistor is electrically connected with the output end of the rectifying circuit, the D pole of the first MOS tube and the D pole of the second MOS tube are electrically connected with the second end of the first resistor, the S pole of the first MOS tube is electrically connected with the D pole of the third MOS tube, the S pole of the second MOS tube is electrically connected with the D pole of the fourth MOS tube, and the S pole of the third MOS tube is electrically connected with the S pole of the fourth MOS tube;
the output end of the first driving circuit is electrically connected with the G pole of the first MOS tube and the G pole of the third MOS tube, and the output end of the second driving circuit is electrically connected with the G pole of the second MOS tube and the G pole of the fourth MOS tube.
3. The stepless speed regulation circuit of an alternating current asynchronous motor according to claim 1, characterized in that the zero-crossing detection loop comprises: the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the first triode;
the output end of the rectification loop is electrically connected with the first end of the second resistor, the second end of the second resistor is electrically connected with the first end of the third resistor, the second end of the third resistor is electrically connected with the electrode B of the first triode through the fourth resistor, the electrode B of the first triode is grounded through the fifth resistor, the electrode E of the first triode is grounded, the electrode C of the first triode is connected with the power supply through the sixth resistor, and the electrode C of the first triode is electrically connected with the input end of the controller.
4. The stepless speed regulation circuit of an alternating current asynchronous motor according to claim 2, characterized in that the first drive circuit comprises: the circuit comprises a first driving chip, a first diode, a seventh resistor, an eighth resistor and a first capacitor;
the HO end of the first driving chip is electrically connected with the G pole of the first MOS tube through the seventh resistor, the LO end of the first driving chip is electrically connected with the G pole of the third MOS tube through the eighth resistor, the VB end of the first driving chip is electrically connected with the S pole of the first MOS tube through the first capacitor, the VS end of the first driving chip is electrically connected with the S pole of the first MOS tube and the D pole of the third MOS tube, and the VS end of the first driving chip is electrically connected with the input end of the alternating current asynchronous motor;
VCC end of first driver chip with the positive pole electrical connection of first diode, VB end of first driver chip with the negative pole electrical connection of first diode, the first phase place output of controller with first driver chip's HIN end electrical connection, first electronic switch's output with first driver chip's LIN end electrical connection.
5. The stepless speed regulating circuit of an alternating current asynchronous motor according to claim 4, characterized in that the second drive circuit comprises: the second driving chip, a second diode, a ninth resistor, a tenth resistor and a second capacitor;
the HO end of the second driving chip is electrically connected with the G pole of the second MOS tube through the ninth resistor, the LO end of the second driving chip is electrically connected with the G pole of the fourth MOS tube through the tenth resistor, the VB end of the second driving chip is electrically connected with the S pole of the second MOS tube through the first capacitor, the VS end of the second driving chip is electrically connected with the S pole of the second MOS tube and the D pole of the fourth MOS tube, and the VS end of the second driving chip is electrically connected with the input end of the alternating current asynchronous motor;
the VCC end of the second driving chip is electrically connected with the anode of the second diode, the VB end of the second driving chip is electrically connected with the cathode of the second diode, the second phase output end of the controller is electrically connected with the HIN end of the second driving chip, and the output end of the second electronic switch is electrically connected with the LIN end of the second driving chip.
6. The stepless speed regulating circuit of an alternating current asynchronous motor according to claim 4, characterized in that the first electronic switch comprises a second triode, a third diode, an eleventh resistor and a twelfth resistor;
the B pole of the second triode is electrically connected with the C pole of the third triode through the eleventh resistor, the E pole of the third triode is grounded, the B pole of the third triode is electrically connected with the first phase output end of the controller through the twelfth resistor, the C pole of the second triode is electrically connected with the anode of the third diode, and the E pole of the second triode is electrically connected with the cathode of the diode;
the C electrode of the second triode is electrically connected with the LIN end of the first driving chip, and the E electrode of the second triode is electrically connected with the driving signal output end of the controller.
7. The stepless speed regulating circuit of an alternating current asynchronous motor according to claim 5, characterized in that the second electronic switch comprises a fourth triode, a fifth triode, a fourth diode, a thirteenth resistor and a fourteenth resistor;
a B pole of the fourth transistor is electrically connected to a C pole of the fifth transistor through the thirteenth resistor, an E pole of the fifth transistor is grounded, a B pole of the fifth transistor is electrically connected to the second phase signal output terminal of the controller through the fourteenth resistor, a C pole of the fourth transistor is electrically connected to an anode of the fourth diode, and an E pole of the fourth transistor is electrically connected to the C pole of the fifth transistorFour-diodeIs electrically connected with the cathode;
and the C electrode of the fourth triode is electrically connected with the LIN end of the second driving chip, and the E electrode of the fourth triode is electrically connected with the driving signal output end of the controller.
8. The stepless speed regulating circuit of an ac asynchronous motor as claimed in claim 4, wherein said first MOS transistor, said second MOS transistor, said third MOS transistor, and said fourth MOS transistor are N-channel MOS transistors.
9. An ac asynchronous machine comprising a machine body and a stepless speed regulation circuit of an ac asynchronous machine according to any one of claims 1 to 8, wherein the output of the H-bridge drive circuit is electrically connected to the input of the machine body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221065094.7U CN217607727U (en) | 2022-05-06 | 2022-05-06 | Alternating current asynchronous motor and stepless speed regulation circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221065094.7U CN217607727U (en) | 2022-05-06 | 2022-05-06 | Alternating current asynchronous motor and stepless speed regulation circuit thereof |
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| Publication Number | Publication Date |
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| CN217607727U true CN217607727U (en) | 2022-10-18 |
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| CN202221065094.7U Active CN217607727U (en) | 2022-05-06 | 2022-05-06 | Alternating current asynchronous motor and stepless speed regulation circuit thereof |
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| Country | Link |
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| CN (1) | CN217607727U (en) |
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