CN111654199A - Asymmetric half-bridge power converter of switched reluctance motor and control method thereof - Google Patents
Asymmetric half-bridge power converter of switched reluctance motor and control method thereof Download PDFInfo
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- CN111654199A CN111654199A CN202010460246.2A CN202010460246A CN111654199A CN 111654199 A CN111654199 A CN 111654199A CN 202010460246 A CN202010460246 A CN 202010460246A CN 111654199 A CN111654199 A CN 111654199A
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- 230000005284 excitation Effects 0.000 claims description 46
- 230000005347 demagnetization Effects 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/5388—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with asymmetrical configuration of switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/08—Reluctance motors
- H02P25/092—Converters specially adapted for controlling reluctance motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/08—Reluctance motors
- H02P25/098—Arrangements for reducing torque ripple
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- Power Engineering (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses an asymmetric half-bridge power converter of a switched reluctance motor, which comprises a first main circuit and a second main circuit, wherein the first main circuit and the second main circuit are connected to a power supply through an LC filter and are connected in parallel, the first main circuit comprises a fourth power diode D4, a first electrolytic capacitor C1, an A-phase motor and a C-phase motor, the A-phase motor and the C-phase motor respectively comprise two groups of switching tubes, two groups of diodes and a group of windings, and the A-phase motor and the C-phase motor share one group of switching tubes and one group of diodes; the second main circuit comprises an eighth power diode D8, a second electrolytic capacitor C2, a B-phase motor and a D-phase motor, wherein the B-phase motor and the D-phase motor respectively comprise two groups of switching tubes, two groups of diodes and a group of windings, and the B-phase motor and the D-phase motor share one group of switching tubes and one group of diodes.
Description
Technical Field
The invention relates to a power converter, in particular to an asymmetric half-bridge power converter of a switched reluctance motor.
Background
The switched reluctance motor has the advantages of high reliability, large starting torque, low manufacturing cost and the like, the power topological structure of the switched reluctance motor is always a hot point of national research, and the proper topological structure can reduce the cost of the switched reluctance motor, improve the dynamic characteristic of the switched reluctance motor and widen the application occasions of the switched reluctance motor.
In a traditional switched reluctance motor driving system, the most widely applied and typical power converter is an asymmetric half-bridge type power converter topological structure, the converter can realize independent control on each phase winding of a stator, a follow current loop during chopping and a quick demagnetization loop during phase commutation are provided for the motor in the running process of the motor, and the control process is simple and easy to realize.
However, the converter has the disadvantages that two switching tubes and two freewheeling diodes are used for each phase of the stator winding, and each phase needs to be respectively provided with a current sensor for current detection, so that the volume and the cost of the motor system are obviously increased and the reliability of the system is reduced as the number of phases of the motor winding is increased.
Disclosure of Invention
The invention aims to provide an asymmetric half-bridge power converter of a switched reluctance motor and a control method thereof, which have the advantages of small volume, low cost and strong reliability.
The purpose of the invention is realized as follows: an asymmetric half-bridge power converter of a switched reluctance motor comprises a first main circuit and a second main circuit which are connected to a power supply through an LC filter, wherein the first main circuit and the second main circuit are connected in parallel, the first main circuit comprises a fourth power diode D4, a first electrolytic capacitor C1, an A-phase motor and a C-phase motor, the A-phase motor and the C-phase motor respectively comprise two groups of switching tubes, two groups of diodes and a group of windings, and the A-phase motor and the C-phase motor share one group of switching tubes and one group of diodes; the second main circuit comprises an eighth power diode D8, a second electrolytic capacitor C2, a B-phase motor and a D-phase motor, wherein the B-phase motor and the D-phase motor respectively comprise two groups of switching tubes, two groups of diodes and a group of windings, and the B-phase motor and the D-phase motor share one group of switching tubes and one group of diodes.
As a further limitation of the present invention, the a-phase motor includes a first switching tube S1, a second switching tube S2, a first power diode D1, a second power diode D2, and an a-phase winding;
a first end of the first switch tube S1 is connected to a first end of a power supply, a second end of the first switch tube S1 is connected to a negative end of the first power diode D1, a negative end of the second power diode D2 is connected to the first end of the first switch tube S1 and the first end of the power supply, a positive end of the second power diode D2 is connected to a first end of the second switch tube S2, a second end of the second switch tube S2 is connected to a positive end of the first power diode D1 and the second end of the power supply, a first end of the phase a winding is connected to a second end of the first switch tube S1 and the negative end of the first power diode D1, and a second end of the phase a winding is connected to the first end of the second switch tube S1 and the positive end of the second power diode D1.
As a further limitation of the present invention, the C-phase motor includes a second switching tube S2, a third switching tube S3, a second power diode D2, a third power diode D3, and a C-phase winding, which shares the second switching tube S2 and the second power diode D2 with the a-phase motor;
a first end of the third switch tube S3 is connected to a first end of the power supply, a first end of the first switch tube S1 and a negative end of the second power diode D2, a second end of the third switch tube S3 is connected to a negative end of the third power diode D3, a positive end of the third power diode D3 is connected to a second end of the second switch tube S2, a positive end of the first power diode D1 and a second end of the power supply, a first end of the C-phase winding is connected to a second end of the winding a, a positive end of the second power diode D2 and a first end of the second switch tube S2, and a second end of the C-phase winding is connected to a second end of the third switch tube S3 and a negative end of the third power diode D3.
As a further limitation of the present invention, the B-phase motor includes a fifth switching tube S5, a sixth switching tube S6, a fifth power diode D5, a sixth power diode D6, and a B-phase winding;
a first end of the fifth switching tube S5 is connected to a first end of the power supply, a second end of the fifth switching tube S5 is connected to a negative end of the fifth power diode D5, a negative end of the sixth power diode D6 is connected to the first end of the fifth switching tube S5 and the first end of the power supply, a positive end of the sixth power diode D6 is connected to the first end of the sixth switching tube S6, a second end of the sixth switching tube S6 is connected to the positive end of the fifth power diode D5 and the second end of the power supply, a positive end of the fifth power diode D5 is connected to the second end of the power supply, a first end of the B-phase winding is connected to the second end of the fifth switching tube S5 and the negative end of the fifth power diode D5, and a second end of the B-phase winding is connected to the first end of the sixth switching tube S6 and the positive end of the sixth power diode D6.
As a further limitation of the present invention, the D-phase motor includes a sixth switching tube S6, a seventh switching tube S7, a sixth power diode D6, a seventh power diode D7, and a D-phase winding, which shares the sixth switching tube S6 and the sixth power diode D6 with the B-phase motor;
a first end of the seventh switch tube S7 is connected to a first end of the power supply, a first end of the fifth switch tube S5 and a negative end of the sixth power diode D2, a second end of the seventh switch tube S7 is connected to a negative end of the seventh power diode D7, a positive end of the seventh power diode D7 is connected to a second end of the sixth switch tube S6, a positive end of the fifth power diode D5 and a second end of the power supply, a first end of the D-phase winding is connected to a second end of the winding B, a positive end of the sixth power diode D6 and a first end of the sixth switch tube S6, and a second end of the D-phase winding is connected to a second end of the seventh switch tube S7 and a negative end of the seventh power diode D7.
As a further limitation of the present invention, each phase winding includes three modes of operation: an excitation mode, a zero-voltage current demand mode and a demagnetization mode; the method comprises the following specific steps: when the upper switch tube and the lower switch tube are both conducted, the power supply supplies power to the motor, the two ends of the winding bear positive voltage U, and the current of the winding rises, which is an excitation mode; when the upper switch tube is turned off and the lower switch tube is turned on, the voltage at two ends of the winding is zero, the winding current completes a path through the lower switch tube and the lower power diode, and the winding current slowly drops, which is a zero-voltage follow current mode; when the upper switch tube and the lower switch tube are both turned off, the two ends of the winding bear negative voltage-U, the phase current carries out energy feedback through the lower power diode D1 and the upper power diode D2, and the winding current is rapidly reduced, namely a demagnetization mode; this is one phase supply cycle.
A control method of an asymmetric half-bridge power converter of a switched reluctance motor comprises three control modes, namely a single-phase excitation mode, a two-phase excitation mode and a single-double mixed excitation mode;
in a single-phase excitation mode, only one phase winding is excited at any time, and circulation is performed in a mode that A = > B = > C = > D = > A;
in a two-phase excitation mode, exciting the windings in the rising area at the same time, circulating in a mode of AB = > BC = > CD = > DA = > AB, and setting the polarities of the windings of two phases to be opposite when two adjacent phases are excited simultaneously;
in the dual-mode operation state, two-phase excitation is adopted during starting, and unidirectional excitation is adopted during normal operation.
As a further limitation of the present invention, in the dual-mode operation state, during the system operation process, the system input current is continuously detected, when the current is greater than a certain interval, the two-phase excitation mode is started, and when the current is decreased to a certain interval, the single-phase excitation mode is started, and the interval is a dead-ring type.
Compared with the prior art, the invention has the beneficial effects that:
(1) the asymmetric half-bridge power converter of the switched reluctance motor sharing the switching tube is changed on the basis of asymmetric half-bridge topology, so that the advantages of the asymmetric half-bridge power converter are reserved, less than two main switching devices are used for each phase, the number of switching devices can be effectively reduced, and the defect that each phase in an asymmetric half-bridge circuit needs two main switching devices is overcome;
(2) the phase number of the switched reluctance motor can be increased, the torque ripple is reduced, the defects that a traditional asymmetric bridge type driving circuit is large in the number of switching devices, high in cost of a control circuit and large in size of the whole switched reluctance motor driver are overcome, and the cost of the control circuit is saved;
(3) because the phase current of the switch reluctance motor is unidirectional, a unipolar power converter can be adopted, so that the power main circuit is simple, and the switch reluctance motor has the advantages that a common alternating current and brushless direct current driving system does not have, namely, a phase winding and a main switch device are connected in series, so that short-circuit faults can be prevented.
Drawings
Fig. 1 is an asymmetric half-bridge power converter topology structure of a switched reluctance motor according to the present invention.
Fig. 2 is a circuit topology diagram of an excitation pattern in an embodiment of the present invention.
Fig. 3 is a circuit topology diagram of the zero voltage freewheel mode in an embodiment of the invention.
Fig. 4 is a circuit topology diagram of a demagnetization pattern according to an embodiment of the present invention.
FIG. 5 is a flow chart of the dual mode operation of the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples.
The invention provides a switched reluctance motor asymmetric half-bridge power converter sharing a switching tube, which comprises a power supply, an LC filter, a fourth power diode D4, an eighth power diode D8, a first electrolytic capacitor C1, a second electrolytic capacitor C2 and a four-phase motor (A, B, C, D), wherein the first electrolytic capacitor C1 and the second electrolytic capacitor C2 are connected in parallel at two ends of the power supply.
Each phase motor comprises two switching tubes, two power diodes and a winding, the A phase motor and the C phase motor share one switching tube, and the B phase motor and the D phase motor share one switching tube.
Specifically, the a-phase motor includes a first switch tube S1, a second switch tube S2, a first power diode D1, a second power diode D2, and an a-phase winding. The first end of the first switch tube S1 is connected with the first end of the power supply, the second end of the first switch tube S1 is connected with the negative electrode end of the first power diode D1, the negative electrode end of the second power diode D2 is connected with the first end of the first switch tube S1 and the first end of the power supply, the positive electrode end of the second power diode D2 is connected with the first end of the second switch tube S2, the second end of the second switch tube S2 is connected with the positive electrode end of the first power diode D1 and the second end of the power supply, and the positive electrode end of the first power diode D1 is connected with the second end of the power supply. The first end of the winding of phase a is connected to the second end of the first switch transistor S1 and the negative terminal of the first power diode D1, and the second end of the winding of phase a is connected to the winding of phase C.
The phase-C motor and the phase-a motor share the second switching tube S2 and the second power diode D2. The C-phase motor includes a second switching tube S2, a third switching tube S3, a second power diode D2, a third power diode D3, and a C-phase winding. A first end of the third switching tube S3 is connected to a first end of the power supply, a first end of the first switching tube S1, and a negative terminal of the second power diode D2, a second end of the third switching tube S3 is connected to a negative terminal of the third power diode D3, and a positive terminal of the third power diode D3 is connected to a second end of the second switching tube S2, a positive terminal of the first power diode D1, and a second end of the power supply. The first end of the winding of phase C is connected to the second end of the winding of phase a, the positive terminal of the second power diode D2, and the first end of the second switching tube S2, and the second end of the winding of phase C is connected to the second end of the third switching tube S3 and the negative terminal of the third power diode D3.
The phase-B motor comprises a fifth switch tube S5, a sixth switch tube S6, a fifth power diode D5, a sixth power diode D6 and a phase-B winding. A first end of the fifth switching tube S5 is connected to a first end of the power supply, a second end of the fifth switching tube S5 is connected to a negative electrode of the fifth power diode D5, a negative electrode of the sixth power diode D6 is connected to the first end of the fifth switching tube S5 and the first end of the power supply, a positive electrode of the sixth power diode D6 is connected to the first end of the sixth switching tube S6, a second end of the sixth switching tube S6 is connected to the positive electrode of the fifth power diode D5 and the second end of the power supply, and a positive electrode of the fifth power diode D5 is connected to the second end of the power supply. A first end of the winding of the phase B is connected to the second end of the fifth switching tube S5 and the negative terminal of the fifth power diode D5, and a second end of the winding of the phase B is connected to the winding of the phase D.
The D-phase motor and the B-phase motor share the sixth switching tube S6 and the sixth power diode D6. The D-phase motor includes a sixth switching tube S6, a seventh switching tube S7, a sixth power diode D6, a seventh power diode D7, and a winding D. A first end of the seventh switch tube S7 is connected to the first end of the power supply, the first end of the fifth switch tube S5, and the negative terminal of the sixth power diode D2, a second end of the seventh switch tube S7 is connected to the negative terminal of the seventh power diode D7, and a positive terminal of the seventh power diode D7 is connected to the second end of the sixth switch tube S6, the positive terminal of the fifth power diode D5, and the second end of the power supply. The first end of the phase D winding is connected to the second end of the winding B, the positive terminal of the sixth power diode D6, and the first end of the sixth switching tube S6, and the second end of the phase D winding is connected to the second end of the seventh switching tube S7 and the negative terminal of the seventh power diode D7.
A first end of the first electrolytic capacitor C1 is connected to a first end of the power supply and a negative end of the fourth power diode D4, and a second end of the first electrolytic capacitor C1 is connected to a second end of the power supply, a positive end of the first power diode D1, a second end of the second switching tube S2, and a positive end of the third power diode D3. The positive terminal of the fourth power diode D4 is connected to the first terminal of the power supply; the fourth power diode D4 and the first electrolytic capacitor C1 cooperate to realize the energy feedback and voltage stabilization functions.
A first end of the second electrolytic capacitor C2 is connected to the first end of the power supply and the negative end of the eighth power diode D8, and a second end of the second electrolytic capacitor C2 is connected to the second end of the power supply, the positive end of the fifth power diode D5, the second end of the sixth switching tube S6, and the positive end of the seventh power diode D7. The second end of the second electrolytic capacitor C2 is also connected with the second end of the first electrolytic capacitor C1, so that power supply to the B-phase motor and the D-phase motor is realized; the positive terminal of the eighth power diode D8 is connected to the first terminal of the power supply. The eighth power diode D8 and the second electrolytic capacitor C2 cooperate to realize the energy feedback and voltage stabilization functions.
The first switch tube S1, the second switch tube S2, the third switch tube S3, the fifth switch tube S5, the sixth switch tube S6 and the seventh switch tube S7 are all field effect transistors.
In the operation process of the switched reluctance motor, according to the conduction mode of the upper and lower tubes, each phase of winding has three working modes: an excitation mode, a zero voltage freewheel mode, and a demagnetization mode.
Taking phase a as an example, as shown in fig. 2, when the first switching tube S1 (upper switching tube) and the second switching tube S2 (lower switching tube) are both turned on, the power supply supplies power to the phase a motor, the two ends of the winding receive a positive voltage U, and the winding current rises, which is an excitation mode; as shown in fig. 3, when the first switch tube S1 is turned off and the second switch tube S2 is turned on, the voltage across the winding is zero, the winding current completes a path through the second switch tube S2 and the first power diode D1, and the winding current slowly decreases, which is a zero-voltage freewheeling mode; as shown in fig. 4, when the first switch transistor S1 and the second switch transistor S2 are both turned off, the two ends of the winding receive the negative voltage-U, the phase current is fed back through the first power diode D1 and the second power diode D2, and the winding current rapidly decreases, which is the demagnetization mode. This is one phase supply cycle.
The A, B, C, D phase motor is sequentially supplied with power, when the A phase is switched to the B phase, the A phase feedback electric energy is stored in the first electrolytic capacitor C1, and the part of energy can be used for rapidly increasing the current of the C phase so as to shorten the excitation time; when the phase B is switched to the phase C, the B-phase feedback electric energy is stored in the second electrolytic capacitor C2, and the part of the energy can be used for rapidly increasing the current of the phase D so as to shorten the excitation time; when the phase C is switched to the phase D, the electric energy is stored in the first electrolytic capacitor C1 through C-phase feedback, and the part of the energy can be used for rapidly increasing the current of the phase A so as to shorten the excitation time; when the phase D is switched to the phase A, the D-phase feedback electric energy is stored in the second electrolytic capacitor C2, the part of energy can be used for rapidly increasing the current of the phase B, so that the excitation time is shortened, the process is circularly repeated, the power supply period is greatly shortened, and the loss is reduced. Meanwhile, the mode that the A phase and the C phase share the switch tube, the B phase and the D phase share the switch tube and the A phase and the C phase are connected with the B phase and the D phase in parallel is adopted, so that the loss can be reduced by reducing the number of switch devices, and the volume reduction, the cost reduction and the optimization of the driving performance are realized.
The invention provides a dual-mode operation state, which divides the whole working process into starting and normal operation; the motor adopts double-phase excitation when starting, can achieve large torque, and adopts single-phase excitation when in normal operation; the single-phase excitation, that is, the excitation is performed only on one phase of winding at any time, and the two-phase excitation, that is, the excitation is performed on the winding of which the two-phase inductor is located in the rising area at the same time. The two-phase excitation mode and the single-double mixed excitation mode have the condition of excitation when two adjacent excitation modes are the same, if the two adjacent excitation modes are the same, the polarities of the two adjacent excitation modes are set to be opposite, and then the magnetic lines of force can pass through a short magnetic circuit; when the phases B and C are excited when the phases B and C are the same and the polarities are opposite, a short magnetic circuit can be formed between the phases B and C, and a reverse magnetic force line is generated, and although the magnetic force line is reverse, the magnitude of the generated force is related to the effective value of the current and does not influence the generation of the torque. The short magnetic circuit means that magnetic lines of force do not penetrate through the whole motor and do not penetrate through a semicircle from top to bottom, but when two magnetomotive force line circles exist, the two magnetomotive force line circles are opposite and mutually attracted, a very small magnetic line of force loop can be formed on the adjacent pole, so that the electromagnetic loss on the rotor yoke can be reduced, the efficiency is improved, the output is increased, the force generating effect is better, and the carrying capacity is improved.
Alternatively, as shown in FIG. 5, during dual mode operation, switching back and forth between single phase excitation and dual phase excitation may be performed, with the current of the system (i.e., the current of the system) being the criterioni L ): continuously and circularly detecting the electricity of the system during the operation of the systemWhen the current is larger than a certain interval value IREFHIGHAt that time, two-phase excitation is started. When the current drops to a certain interval value IREFLOWWhen the single-phase excitation is needed, the single-phase excitation is switched back; the judgment interval is of a hysteresis loop type, and the problem of repeated switching does not exist.
In summary, the asymmetric half-bridge power converter of the switched reluctance motor sharing the switching tube provided by the invention is changed on the basis of an asymmetric half-bridge topology, so that the advantages of the asymmetric half-bridge power converter are maintained, less than two main switching devices are used for each phase, the switching devices can be effectively reduced, and the defect that two main switching devices are needed for each phase in an asymmetric half-bridge circuit is overcome.
Meanwhile, the phase number of the switched reluctance motor can be increased, the torque ripple is reduced, the defects that the number of switching devices used in a classical asymmetric bridge type driving circuit is large, the cost of a control circuit is high, and the size of the whole switched reluctance motor driver is large are overcome, and the cost of the control circuit is saved.
Because the phase current of the switch reluctance motor is unidirectional, a unipolar power converter can be adopted, so that the power main circuit is simple, and the switch reluctance motor has the advantages that a common alternating current and brushless direct current driving system does not have, namely, a phase winding and a main switch device are connected in series, so that short-circuit faults can be prevented.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (8)
1. The asymmetric half-bridge power converter of the switched reluctance motor is characterized by comprising a first main circuit and a second main circuit which are connected to a power supply through an LC filter, wherein the first main circuit and the second main circuit are connected in parallel, the first main circuit comprises a fourth power diode D4, a first electrolytic capacitor C1, an A-phase motor and a C-phase motor, the A-phase motor and the C-phase motor respectively comprise two groups of switching tubes, two groups of diodes and a group of windings, and the A-phase motor and the C-phase motor share one group of switching tubes and one group of diodes; the second main circuit comprises an eighth power diode D8, a second electrolytic capacitor C2, a B-phase motor and a D-phase motor, wherein the B-phase motor and the D-phase motor respectively comprise two groups of switching tubes, two groups of diodes and a group of windings, and the B-phase motor and the D-phase motor share one group of switching tubes and one group of diodes.
2. The asymmetric half-bridge power converter of claim 1, wherein the a-phase motor comprises a first switch transistor S1, a second switch transistor S2, a first power diode D1, a second power diode D2, and an a-phase winding;
a first end of the first switch tube S1 is connected to a first end of a power supply, a second end of the first switch tube S1 is connected to a negative end of the first power diode D1, a negative end of the second power diode D2 is connected to the first end of the first switch tube S1 and the first end of the power supply, a positive end of the second power diode D2 is connected to a first end of the second switch tube S2, a second end of the second switch tube S2 is connected to a positive end of the first power diode D1 and the second end of the power supply, a first end of the phase a winding is connected to a second end of the first switch tube S1 and the negative end of the first power diode D1, and a second end of the phase a winding is connected to the first end of the second switch tube S1 and the positive end of the second power diode D1.
3. The asymmetric half-bridge power converter of switched reluctance motor as claimed in claim 2, wherein said C-phase motor includes a second switch transistor S2, a third switch transistor S3, a second power diode D2, a third power diode D3 and a C-phase winding, which shares the second switch transistor S2 and the second power diode D2 with the a-phase motor;
a first end of the third switch tube S3 is connected to a first end of the power supply, a first end of the first switch tube S1 and a negative end of the second power diode D2, a second end of the third switch tube S3 is connected to a negative end of the third power diode D3, a positive end of the third power diode D3 is connected to a second end of the second switch tube S2, a positive end of the first power diode D1 and a second end of the power supply, a first end of the C-phase winding is connected to a second end of the winding a, a positive end of the second power diode D2 and a first end of the second switch tube S2, and a second end of the C-phase winding is connected to a second end of the third switch tube S3 and a negative end of the third power diode D3.
4. The asymmetric half-bridge power converter of switched reluctance motor as claimed in claim 1, wherein the B phase motor includes a fifth switch S5, a sixth switch S6, a fifth power diode D5, a sixth power diode D6 and a B phase winding;
a first end of the fifth switching tube S5 is connected to a first end of the power supply, a second end of the fifth switching tube S5 is connected to a negative end of the fifth power diode D5, a negative end of the sixth power diode D6 is connected to the first end of the fifth switching tube S5 and the first end of the power supply, a positive end of the sixth power diode D6 is connected to the first end of the sixth switching tube S6, a second end of the sixth switching tube S6 is connected to the positive end of the fifth power diode D5 and the second end of the power supply, a positive end of the fifth power diode D5 is connected to the second end of the power supply, a first end of the B-phase winding is connected to the second end of the fifth switching tube S5 and the negative end of the fifth power diode D5, and a second end of the B-phase winding is connected to the first end of the sixth switching tube S6 and the positive end of the sixth power diode D6.
5. The asymmetric half-bridge power converter of switched reluctance motor as claimed in claim 4, wherein the D-phase motor includes a sixth switch tube S6, a seventh switch tube S7, a sixth power diode D6, a seventh power diode D7 and a D-phase winding, which share the sixth switch tube S6 and the sixth power diode D6 with the B-phase motor;
a first end of the seventh switch tube S7 is connected to a first end of the power supply, a first end of the fifth switch tube S5 and a negative end of the sixth power diode D2, a second end of the seventh switch tube S7 is connected to a negative end of the seventh power diode D7, a positive end of the seventh power diode D7 is connected to a second end of the sixth switch tube S6, a positive end of the fifth power diode D5 and a second end of the power supply, a first end of the D-phase winding is connected to a second end of the winding B, a positive end of the sixth power diode D6 and a first end of the sixth switch tube S6, and a second end of the D-phase winding is connected to a second end of the seventh switch tube S7 and a negative end of the seventh power diode D7.
6. A switched reluctance machine asymmetric half-bridge power converter according to any of claims 2-5, wherein each phase winding comprises three modes of operation: an excitation mode, a zero-voltage freewheeling mode and a demagnetization mode; the method comprises the following specific steps: when the upper switch tube and the lower switch tube are both conducted, the power supply supplies power to the motor, the two ends of the winding bear positive voltage U, and the current of the winding rises, which is an excitation mode; when the upper switch tube is turned off and the lower switch tube is turned on, the voltage at two ends of the winding is zero, the winding current completes a path through the lower switch tube and the lower power diode, and the winding current slowly drops, which is a zero-voltage follow current mode; when the upper switch tube and the lower switch tube are both turned off, the two ends of the winding bear negative voltage-U, the phase current carries out energy feedback through the lower power diode D1 and the upper power diode D2, and the winding current is rapidly reduced, namely a demagnetization mode; this is one phase supply cycle.
7. A control method of an asymmetric half-bridge power converter of a switched reluctance motor adopts the asymmetric half-bridge power converter of the switched reluctance motor according to any one of claims 1 to 5, and is characterized by comprising three control modes, namely a single-phase excitation mode, a two-phase excitation mode and a single-double mixed excitation mode;
in a single-phase excitation mode, only one phase winding is excited at any time, and circulation is performed in a mode that A = > B = > C = > D = > A;
in a two-phase excitation mode, exciting the windings in the rising area at the same time, circulating in a mode of AB = > BC = > CD = > DA = > AB, and setting the polarities of the windings of two phases to be opposite when two adjacent phases are excited simultaneously;
in the dual-mode operation state, two-phase excitation is adopted during starting, and unidirectional excitation is adopted during normal operation.
8. The method as claimed in claim 6, wherein in the dual-mode operation state, the system input current is continuously detected during the system operation, the two-phase excitation mode is started when the current is greater than a certain interval, and the single-phase excitation mode is started when the current is decreased to a certain interval, wherein the interval is a hysteresis loop.
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