CN214851023U - Motor driving circuit for power factor correction - Google Patents

Motor driving circuit for power factor correction Download PDF

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Publication number
CN214851023U
CN214851023U CN202120653029.5U CN202120653029U CN214851023U CN 214851023 U CN214851023 U CN 214851023U CN 202120653029 U CN202120653029 U CN 202120653029U CN 214851023 U CN214851023 U CN 214851023U
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diode
phase
power switch
switch tube
bridge arm
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王晨
刘斌
李伦全
蔡金琪
周涛
谭魏民
胡鹏
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Nanjing Panda Electronics Co Ltd
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Nanjing Panda Electronics Co Ltd
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Abstract

The utility model discloses a motor drive circuit for power factor correction, which comprises a power grid, a PFC circuit, a Zeta type DC-DC module, a motor drive circuit and a motor which are connected in sequence; the power grid provides energy for the system, the PFC circuit is used for achieving a PFC function when the system works, the Zeta type DC-DC module is used for storing energy and releasing energy through an inductor and a capacitor, and the motor driving circuit is used for achieving motor control of the system. The utility model discloses insert a Zeta type DC-DC switch converter between three-phase PFC circuit and three-phase motor drive circuit, compare with traditional motor device, not only can make the electric current that exchanges and survey the electric wire netting be close to the sine wave, can also realize the drive of the motor that contrast input commercial power is lower simultaneously, or higher voltage, reduced the harmonic interference of system to the electric wire netting, increased motor drive device's range of application.

Description

Motor driving circuit for power factor correction
Technical Field
The utility model relates to a power factor correction technique and motor control field, concretely relates to motor drive circuit for power factor correction.
Background
With increasingly wide application of electrical equipment, most common frequency converters used when a power grid drives a motor adopt a diode rectifier bridge to convert alternating current into direct current, then adopt an IGBT inverter module to convert the direct current into alternating current with adjustable voltage and frequency to control the alternating current motor, the common rectifier bridge obtains energy from the power grid to cause the power grid to suffer from more and more serious harmonic pollution, the best method for solving the problem is Power Factor Correction (PFC), and the traditional main method for improving the power factor of an input end of an AC-DC circuit and reducing current harmonic is to adopt passive devices such as LC filtering, although the circuit structure is simple and the cost is low, the high power factor is difficult to obtain (generally can be improved to about 0.9).
SUMMERY OF THE UTILITY MODEL
Utility model purpose: an object of the utility model is to provide a can solve power factor correction problem, realize the motor drive circuit who is used for power factor correction to low-voltage and high voltage motor drive simultaneously.
The technical scheme is as follows: the utility model comprises a power grid, a PFC circuit, a Zeta type DC-DC module, a motor driving circuit and a motor which are connected in sequence; the power grid provides energy for the system, the PFC circuit is used for achieving a PFC function when the system works, the Zeta type DC-DC module is used for storing energy and releasing energy through an inductor and a capacitor, and the motor driving circuit is used for achieving motor control of the system.
The Zeta type DC-DC module is used as a system intermediate stage and is connected between the PFC circuit and the motor driving circuit; the Zeta type DC-DC module comprises a capacitor C1Two, twoPolar tube D13And an inductance L1、L2、L3Inductance L1One terminal, a PFC circuit and a capacitor C1One end is connected with an inductor L1The other end, a PFC circuit and a diode D13Connecting the anodes; the diode D13The anode is also connected with an inductor L3One end connected to a diode D13Cathode and capacitor C1The other end and an inductor L2One end is connected; the inductance L2Inductor L3The other end is connected with a motor driving circuit.
The power grid comprises three sinusoidal voltage sources with three phases of a, b and c forming an angle of 120 degrees with each other, and one ends of the three-phase voltage sources of a, b and c are connected.
The PFC circuit and the motor driving circuit respectively comprise a plurality of power switch tubes and a plurality of diodes, wherein the power switch tubes adopt N-type MOSFETs or IGBTs and respectively comprise anti-parallel diodes.
Diode D in the PFC circuit1Form an a-phase upper bridge arm and a diode D4Form a phase lower bridge arm and a phase upper bridge arm middle diode D1Anode and a-phase lower arm middle pole tube D4The cathodes of the two are connected to form a first series path; diode D in the PFC circuit2Form a b-phase upper bridge arm and a diode D5Form a b-phase lower bridge arm and a b-phase upper bridge arm middle diode D2Anode of (2) and diode D in b-phase lower bridge arm5The cathodes of the two electrodes are connected to form a second series circuit; diode D in the PFC circuit3Form a c-phase upper bridge arm and a diode D6Form a c-phase lower bridge arm and a c-phase upper bridge arm middle diode D3Anode of (2) and diode D in c-phase lower bridge arm6Are connected to form a third series path.
Diodes D in the first, second and third series paths1Diode D2Diode D3Is connected to the cathode of a diode D4Diode D5Diode D6Are connected with each other.
The other end of the a-phase voltage source of the power grid and a power switch tube Q1Is connected with the collector of the power switch tube Q1Is transmitted byPole and power switch tube Q2Is connected with the emitting electrode of the power switch tube Q2Collector of and diode D in the first series path1The anodes of the anode groups are connected; the other end of the b-phase voltage source of the power grid and a power switch tube Q3Is connected with the collector of the power switch tube Q3Emitter and power switch tube Q4Is connected with the emitting electrode of the power switch tube Q4Collector of (2) and a second diode D in series path2The anodes of the anode groups are connected; the other end of the c-phase voltage source of the power grid and a power switch tube Q5Is connected with the collector of the power switch tube Q5Emitter and power switch tube Q6Is connected with the emitting electrode of the power switch tube Q6Collector of (2) and a diode D in the third series path3Are connected with each other.
Diode D in the motor driving circuit7Anode of and power switch tube Q7The emitting electrodes are connected to form a U-phase upper bridge arm and a diode D10Anode of and power switch tube Q10The emitting electrodes of the two bridge arms are connected to form a U-phase lower bridge arm, and a diode D in the U-phase upper bridge arm7Cathode and power switch tube Q in U-phase lower bridge arm10The collectors of the first and second electrodes are connected to form a fourth series path; diode D in the motor driving circuit8Anode of and power switch tube Q8The emitting electrodes are connected to form a V-phase upper bridge arm and a diode D11Anode of and power switch tube Q11The emitting electrodes of the two diodes are connected to form a V-phase lower bridge arm and a diode D in the V-phase upper bridge arm8Cathode and power switch tube Q in V-phase lower bridge arm11The collectors are connected to form a fifth series path; diode D in the motor driving circuit9Anode of and power switch tube Q9The emitting electrodes of the two diodes are connected to form a W-phase upper bridge arm and a diode D12Anode of and power switch tube Q12The emitting electrodes of the two bridge arms are connected to form a W-phase lower bridge arm, and a diode D in the W-phase upper bridge arm9Cathode and power switch tube Q in W-phase lower bridge arm12Are connected to form a sixth series path.
The power switch tube Q in the fourth, fifth and sixth series paths7、Q8、Q9Is connected to the collector of diode D10Diode D11Diode D12Are connected to each other.
The U phase of the motor and a diode D in a fourth series path of the motor driving circuit7Is connected to the cathode of the diode D in the fifth series path8Is connected to the cathode of the diode, W is connected to a sixth diode D in series connection9Are connected to each other.
Has the advantages that: compared with the prior art, the utility model, its beneficial effect lies in: (1) compared with the traditional frequency conversion device, the power density of the system can be improved and the volume can be reduced without a bus capacitor, a soft start circuit and an energy consumption resistor and a switch which are connected in parallel on the bus capacitor; (2) compared with the traditional frequency conversion device, the PFC can be realized; (3) the highest driving voltage that traditional frequency conversion device can export is grid voltage, the utility model discloses motor drive voltage can not be restricted in grid voltage's size, can realize the drive to higher voltage motor, has expanded motor drive's application scenario.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention;
fig. 2 is a schematic flow diagram of the PFC circuit when the circuit of the present invention works, and the typical control modes Ua >0> Ub > Uc are taken as examples of the current flowing out of the a phase and flowing into the b phase;
fig. 3 is a schematic flow diagram of the PFC circuit current flowing out of the a phase and flowing into the c phase, which is taken as an example of typical control modes of Ua >0> Ub > Uc of the present invention when the circuit is in operation;
FIG. 4 shows that the utility model turns off PFC high frequency modulation switch tube Q4、Q6The later circuit structure schematic diagram;
fig. 5 is a schematic flow diagram of a PFC circuit in a typical control manner of Ua <0< Ub < Uc when the circuit of the present invention operates, where the current flows into the phase a and flows out of the phase b;
fig. 6 is a schematic flow diagram of the PFC circuit when the circuit of the present invention works, and the typical control mode of Ua <0< Ub < Uc is taken as an example, when the current flows into the a phase and flows out of the c phase;
fig. 7 is a schematic diagram of the circuit of the present invention after the switching operation is completed in the PFC stage, in which the U phase is the phase with the maximum absolute value of the motor current and the current direction is the current flowing into the motor, and the V-phase current direction flows out of the motor;
fig. 8 is a schematic diagram of the circuit of the present invention after the switching operation is completed in the PFC stage, in which the U phase is the phase with the maximum absolute value of the motor current and the current direction is the current flowing into the motor, and the W phase current direction flows out of the motor;
fig. 9 is a schematic diagram of the circuit of the present invention after the switching operation is completed in the PFC stage, in which the U phase is the phase with the maximum absolute value of the motor current and the current direction is the current flowing out of the motor, and the V-phase current direction flows into the motor;
fig. 10 is a schematic diagram of the circuit PFC according to the present invention, after the switching operation is completed, the U-phase is the maximum phase of the motor current absolute value and the current direction is the current flowing out of the motor, and the W-phase current direction flows into the motor.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and the attached drawings.
As shown in fig. 1, the present invention includes a power grid 100, a PFC circuit 200, a Zeta-type DC-DC module 300, a motor driving circuit 400, and a motor 500; the power grid 100 provides energy for the system, the power grid 100 comprises three sinusoidal voltage sources with three phases a, b and c forming an angle of 120 degrees with each other, one ends of the three-phase voltage sources a, b and c are connected, and the other ends of the three-phase voltage sources a, b and c are respectively connected with the PFC circuit 200. The PFC circuit 200 is used for implementing a PFC function when the system works, the Zeta-type DC-DC module 300 is used for storing and releasing energy by an inductor and a capacitor, and the motor driving circuit 400 is used for implementing motor control by the system.
The PFC circuit 200 includes a power switch Q1～Q6And a diode D1～D6Diode D1Form an a-phase upper bridge arm and a diode D4Form a phase lower bridge arm and a phase upper bridge arm middle diode D1Anode and a-phase lower arm middle pole tube D4The cathodes of the two are connected to form a first series path; diode D2Form a b-phase upper bridge arm and a diode D5Form a b-phase lower bridge arm and a b-phase upper bridge arm middle diode D2Anode of (2) and diode D in b-phase lower bridge arm5Cathode connection structure ofA second series path; diode D3Form a c-phase upper bridge arm and a diode D6Form a c-phase lower bridge arm and a c-phase upper bridge arm middle diode D3Anode of (2) and diode D in c-phase lower bridge arm6Are connected to form a third series path. In addition, the diodes D in the first, second and third series paths1Diode D2Diode D3Are connected together, diode D4Diode D5Diode D6Are connected together.
The other end of the a-phase voltage source of the power grid 100 and the power switch Q of the PFC circuit 2001Is connected with the collector of the power switch tube Q1Emitter and power switch tube Q2Is connected with the emitting electrode of the power switch tube Q2Collector of and diode D in the first series path1The anodes of the anode groups are connected; the other end of the b-phase voltage source of the power grid 100 and the power switch Q of the PFC circuit 2003Is connected with the collector of the power switch tube Q3Emitter and power switch tube Q4Is connected with the emitting electrode of the power switch tube Q4Collector of (2) and a second diode D in series path2The anodes of the anode groups are connected; the other end of the c-phase voltage source of the power grid 100 and the power switch tube Q of the PFC circuit 2005Is connected with the collector of the power switch tube Q5Emitter and power switch tube Q6Is connected with the emitting electrode of the power switch tube Q6Collector of (2) and a diode D in the third series path3Are connected with each other.
The Zeta-type DC-DC module 300 is connected as a system intermediate stage between the PFC circuit 200 and the motor drive circuit 400. Zeta-type DC-DC module 300 includes a capacitor C1Diode D13And an inductance L1、L2、L3Inductance L1One terminal connected to the diode D in the PFC circuit 2001、D2、D3Cathode and capacitor C1One end is connected with an inductor L1The other end of the diode is connected with a diode D in the PFC circuit 2004、D5、D6And diode D13Connecting the anodes; diode D13The anode is also connected with an inductor L3One end connected to a diode D13Cathode and capacitor C1The other end and an inductor L2One end is connected; inductor L2The other end of the power switch tube Q in the motor driving circuit 4007、Q8、Q9Is connected with the collector of the inductor L3The other end of the diode is connected with a diode D in the motor driving circuit 40010、D11、D12Are connected to each other.
The motor driving circuit 400 is composed of a power switch tube Q7、Q8、Q9、Q10、Q11、Q12And a diode D7、D8、D9、D10、D11、D12And (4) forming. Diode D7Anode of and power switch tube Q7The emitting electrodes are connected to form a U-phase upper bridge arm and a diode D10Anode of and power switch tube Q10The emitting electrodes of the two bridge arms are connected to form a U-phase lower bridge arm, and a diode D in the U-phase upper bridge arm7Cathode and power switch tube Q in U-phase lower bridge arm10The collectors of the first and second electrodes are connected to form a fourth series path; diode D8Anode of and power switch tube Q8The emitting electrodes are connected to form a V-phase upper bridge arm and a diode D11Anode of and power switch tube Q11The emitting electrodes of the two diodes are connected to form a V-phase lower bridge arm and a diode D in the V-phase upper bridge arm8Cathode and power switch tube Q in V-phase lower bridge arm11The collectors are connected to form a fifth series path; diode D9Anode of and power switch tube Q9The emitting electrodes of the two diodes are connected to form a W-phase upper bridge arm and a diode D12Anode of and power switch tube Q12The emitting electrodes of the two bridge arms are connected to form a W-phase lower bridge arm, and a diode D in the W-phase upper bridge arm9Cathode and power switch tube Q in W-phase lower bridge arm12Are connected to form a sixth series path. In addition, the power switch tube Q in the fourth, fifth and sixth series paths7、Q8、Q9Is connected to the collector of diode D10Diode D11Diode D12Are connected to each other. Diode D in the fourth series path between the U phase of motor 500 and motor drive circuit 4007Of a cathodeConnected, V phase and fifth diode D in series path8Is connected to the cathode of the diode, W is connected to a sixth diode D in series connection9Are connected to each other. In this embodiment, the power switch tube Q1～Q14An N-type MOSFET or an IGBT is adopted, and anti-parallel diodes are respectively arranged in the N-type MOSFET or the IGBT.
A filter is arranged between the power grid 100 and the PFC circuit 200 or between the motor driving circuit 400 and the motor 500, or the filter is removed, specifically, the filter is arranged at the front end of the PFC circuit 200 and the front end of the motor 500, and the working principle of the invention is not influenced by any filter; in other alternative embodiments, no filter may be added, consistent with the spirit of the present invention.
For simplicity of analysis, the three-phase grid voltage is considered to be symmetrical, and for other grid voltage situations, a person skilled in the art can understand a control mode of the three-phase controllable rectifying circuit in the embodiment. And performing PWM modulation on the power switch tube corresponding to the minimum and the middle phase of the actual value of the three-phase voltage, wherein the power switch tube corresponding to the maximum and the absolute value of the three-phase voltage is in a normally-on state. Because of three-phase symmetry, ia + ib + ic is 0, and the absolute value of the phase current with different sign is equal to the sum of the absolute values of the phase currents with the same sign.
As shown in fig. 2 to 6, when the circuit is operated, the power switch tube Q is used1～Q6To realize PFC and control the inductor L1The current of phase a is the largest absolute value and Ua>0>Ub>Uc is an example analysis, at the moment, the phase a current flows out of a power grid, the phase b and phase c currents flow into the power grid, and a power switch tube Q1Normal open, Q4、Q6High-frequency PWM modulation, the phase current of a phase, b phase and c phase respectively passes through a power switch tube Q2、Q3、Q5At this time, the circuit operation state is as shown in fig. 2 and 3, when the power switch tube Q is in4、Q6After being turned off, the inductor L1Release energy to the capacitor C1Charging while inductance L2、L3The current is controlled by the motor driving circuit, and the working state of the circuit is shown in figure 4; when the a phase is maximum in absolute value and Ua<0<Ub<At Uc, the phase a current flows into the power grid, and the phase b and phase c currents flow out of the power gridPower switch tube Q2Normally-on, power switch tube Q3、Q5High-frequency PWM modulation, the phase current of a phase, b phase and c phase respectively passes through a power switch tube Q1、Q4、Q6At this time, the current of the PFC circuit 200 flows as shown in fig. 5 and 6. When power switch tube Q3、Q5After being turned off, the inductor L1Release energy to the capacitor C1Charging while inductance L2、L3The above current is controlled by the motor driving circuit 400, and the working state of the circuit is shown in fig. 4, and the rest of the conditions are analyzed similarly.
As shown in fig. 7 to 10, the PFC is controlled while the inductor L is controlled2、L3The current on the power switch tube Q is in a continuous state7～Q12The motor control is realized, if the U phase is the phase with the maximum absolute value of the motor current and the current direction flows into the motor, the power switch tube Q7Normally-on, power switch tube Q10，Q8，Q9Turn-off, to the power switch tube Q11、Q12Performing high-frequency PWM modulation, wherein the working state of the circuit is shown in figures 7 and 8; if the U phase is the phase with the maximum absolute value of the motor current and the current flows out of the motor, the power switch tube Q10Normally-on, power switch tube Q7、Q11、Q12Turn off, pair Q8，Q9The high frequency PWM modulation is performed, and the duty ratio is obtained by the controller, and the circuit operation state is shown in fig. 9 and 10. The rest of the cases are analyzed in the same way.

Claims (10)

1. A motor drive circuit for power factor correction, characterized by: the device comprises a power grid (100), a PFC circuit (200), a Zeta type DC-DC module (300), a motor driving circuit (400) and a motor (500) which are connected in sequence; the power grid (100) provides energy for a system, the PFC circuit (200) is used for achieving a PFC function when the system works, the Zeta type DC-DC module (300) is used for storing energy and releasing energy through an inductor and a capacitor, and the motor driving circuit (400) is used for achieving motor control through the system.
2. Use according to claim 1The motor driving circuit for power factor correction is characterized in that: the Zeta type DC-DC module (300) is connected between the PFC circuit (200) and the motor driving circuit (400) as a system intermediate stage; the Zeta-type DC-DC module (300) comprises a capacitance C1Diode D13And an inductance L1、L2、L3Inductance L1One terminal, a PFC circuit (200) and a capacitor C1One end is connected with an inductor L1The other end is connected with a PFC circuit (200) and a diode D13Connecting the anodes;
the diode D13The anode is also connected with an inductor L3One end connected to a diode D13Cathode and capacitor C1The other end and an inductor L2One end is connected; the inductance L2Inductor L3The other end is connected with a motor driving circuit (400).
3. A motor drive circuit for power factor correction according to claim 1, characterized in that: the power grid (100) comprises three sinusoidal voltage sources with three phases of a, b and c forming an angle of 120 degrees with each other, and one ends of the three-phase voltage sources of a, b and c are connected.
4. A motor drive circuit for power factor correction according to claim 1, characterized in that: the PFC circuit (200) and the motor driving circuit (400) respectively comprise a plurality of power switch tubes and a plurality of diodes, wherein the power switch tubes adopt N-type MOSFETs or IGBTs and respectively comprise anti-parallel diodes.
5. The motor drive circuit for power factor correction according to claim 4, characterized in that: a diode D in the PFC circuit (200)1Form an a-phase upper bridge arm and a diode D4Form a phase lower bridge arm and a phase upper bridge arm middle diode D1Anode and a-phase lower arm middle pole tube D4The cathodes of the two are connected to form a first series path;
a diode D in the PFC circuit (200)2Form a b-phase upper bridge arm and a diode D5Form a b-phase lower bridge arm and a b-phase upper bridge arm middle diode D2Anode of (2) and diode D in b-phase lower bridge arm5The cathodes of the two electrodes are connected to form a second series circuit;
a diode D in the PFC circuit (200)3Form a c-phase upper bridge arm and a diode D6Form a c-phase lower bridge arm and a c-phase upper bridge arm middle diode D3Anode of (2) and diode D in c-phase lower bridge arm6Are connected to form a third series path.
6. The motor drive circuit for power factor correction according to claim 5, characterized in that: diodes D in the first, second and third series paths1Diode D2Diode D3Is connected to the cathode of a diode D4Diode D5Diode D6Are connected with each other.
7. The motor drive circuit for power factor correction according to claim 5, characterized in that: the other end of the a-phase voltage source of the power grid (100) and a power switch tube Q1Is connected with the collector of the power switch tube Q1Emitter and power switch tube Q2Is connected with the emitting electrode of the power switch tube Q2Collector of and diode D in the first series path1The anodes of the anode groups are connected;
the other end of the b-phase voltage source of the power grid (100) and a power switch tube Q3Is connected with the collector of the power switch tube Q3Emitter and power switch tube Q4Is connected with the emitting electrode of the power switch tube Q4Collector of (2) and a second diode D in series path2The anodes of the anode groups are connected;
the other end of the c-phase voltage source of the power grid (100) and a power switch tube Q5Is connected with the collector of the power switch tube Q5Emitter and power switch tube Q6Is connected with the emitting electrode of the power switch tube Q6Collector of (2) and a diode D in the third series path3Are connected with each other.
8. The method of claim 4 for power factorCorrected motor drive circuitry, characterized by: a diode D in the motor drive circuit (400)7Anode of and power switch tube Q7The emitting electrodes are connected to form a U-phase upper bridge arm and a diode D10Anode of and power switch tube Q10The emitting electrodes of the two bridge arms are connected to form a U-phase lower bridge arm, and a diode D in the U-phase upper bridge arm7Cathode and power switch tube Q in U-phase lower bridge arm10The collectors of the first and second electrodes are connected to form a fourth series path;
a diode D in the motor drive circuit (400)8Anode of and power switch tube Q8The emitting electrodes are connected to form a V-phase upper bridge arm and a diode D11Anode of and power switch tube Q11The emitting electrodes of the two diodes are connected to form a V-phase lower bridge arm and a diode D in the V-phase upper bridge arm8Cathode and power switch tube Q in V-phase lower bridge arm11The collectors are connected to form a fifth series path;
a diode D in the motor drive circuit (400)9Anode of and power switch tube Q9The emitting electrodes of the two diodes are connected to form a W-phase upper bridge arm and a diode D12Anode of and power switch tube Q12The emitting electrodes of the two bridge arms are connected to form a W-phase lower bridge arm, and a diode D in the W-phase upper bridge arm9Cathode and power switch tube Q in W-phase lower bridge arm12Are connected to form a sixth series path.
9. A motor drive circuit for power factor correction as recited in claim 8, wherein: the power switch tube Q in the fourth, fifth and sixth series paths7、Q8、Q9Is connected to the collector of diode D10Diode D11Diode D12Are connected to each other.
10. A motor drive circuit for power factor correction as recited in claim 8, wherein: a diode D in a fourth series path between the U phase of the motor (500) and the motor drive circuit (400)7Is connected to the cathode of the diode D in the fifth series path8Is connected with the cathode, W phase is connected with the sixth stringDiode D in the connecting channel9Are connected to each other.
CN202120653029.5U 2021-03-31 2021-03-31 Motor driving circuit for power factor correction Active CN214851023U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112968651A (en) * 2021-03-31 2021-06-15 南京熊猫电子股份有限公司 Motor driving circuit for power factor correction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112968651A (en) * 2021-03-31 2021-06-15 南京熊猫电子股份有限公司 Motor driving circuit for power factor correction

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