CN115528921A - Three-phase high-gain converter and control method thereof - Google Patents

Three-phase high-gain converter and control method thereof Download PDF

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Publication number
CN115528921A
CN115528921A CN202211506625.6A CN202211506625A CN115528921A CN 115528921 A CN115528921 A CN 115528921A CN 202211506625 A CN202211506625 A CN 202211506625A CN 115528921 A CN115528921 A CN 115528921A
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tube
switching
switch
control signal
tubes
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CN115528921B (en
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乐卫平
林桂浩
林伟群
姚志毅
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Shenzhen CSL Vacuum Science and Technology Co Ltd
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Shenzhen CSL Vacuum Science and Technology Co Ltd
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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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/425—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a high frequency AC output voltage
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention relates to the technical field of converters, in particular to a three-phase high-gain converter and a control method thereof. The three-phase high-gain converter includes: the first ends of the three first switch tubes are connected; the first end of each second switch tube is connected with the second end of one first switch tube; the second end of each third switching tube of the third switching group is respectively connected with the first end of one second switching tube; the second ends of the three third switching tubes are connected; a first capacitor is arranged between the first end of the first switching tube and the first end of the third switching tube; when three third switching tubes of the third switching group are all conducted, the first switching group and the second switching group form a three-phase rectification circuit; when all three first switch tubes of the first switch group are conducted, the second switch group and the third switch group form a three-phase inverter circuit. The three-phase high-gain converter can effectively reduce the influence of harmonic waves of a three-phase input power supply.

Description

Three-phase high-gain converter and control method thereof
Technical Field
The invention relates to the technical field of converters, in particular to a three-phase high-gain converter and a control method thereof.
Background
The three-phase high-gain converter uses a three-phase power supply as a voltage source, and the influence of harmonic waves existing in the three-phase power supply on a subsequent circuit is large. The rectifier circuit on the input side of the traditional three-phase high-gain converter is mostly formed by rectifier diodes, and because the diodes are uncontrollable rectifier devices, the influence of harmonic waves on the input side of the three-phase high-gain converter cannot be reduced by adjusting the rectifier circuit on the input side.
Disclosure of Invention
An object of the present invention is to provide a three-phase high-gain converter and a control method thereof, which overcome one or more of the problems due to the limitations and disadvantages of the related art, at least to some extent.
In a first aspect of the present invention, there is provided a three-phase high-gain converter, comprising:
the first switch group comprises three first switch tubes, and the first ends of the three first switch tubes are connected; second ends of the three first switching tubes are respectively connected with an A phase, a B phase and a C phase of the three-phase power supply;
the first switch group comprises three first switch tubes, and the first end of each first switch tube is connected with the second end of one first switch tube;
the second end of each second switching tube is connected with the second end of one second switching tube; the first ends of the three third switching tubes are connected;
a first end of the first capacitor is connected with a first end of the first switching tube, and a second end of the first capacitor is connected with a first end of the third switching tube;
the input end of the transformer is connected with the second end of the third switching tube;
the three-phase power supply, A phase, B phase and C phase are respectively connected with the source electrode of a first switching tube;
when three third switching tubes of the third switching group are all conducted, the first switching group and the second switching group form a three-phase rectification circuit; when all three first switch tubes of the first switch group are conducted, the second switch group and the third switch group form a three-phase inverter circuit.
Optionally, the transformer includes a primary winding i, a primary winding ii, a primary winding iii, a secondary winding i, a secondary winding ii, and a secondary winding iii;
the three third switching tubes are respectively a third switching tube I, a third switching tube II and a third switching tube III;
the first end of the primary winding I is connected with the second end of the third switching tube I, and the second end of the primary winding I is connected with the first end of the primary winding II;
the first end of the primary winding II is connected with the second end of the third switching tube II, and the second end of the primary winding II is connected with the first end of the primary winding III;
the first end of the primary winding III is connected with the second end of the third switching tube III, and the second end of the primary winding III is connected with the first end of the primary winding I;
and the second end of the secondary winding I is connected with the first end of the secondary winding II, the second end of the secondary winding II is connected with the first end of the secondary winding III, and the first end of the secondary winding I and the second end of the secondary winding III form the output end of the three-phase high-gain converter.
Optionally, two ends of the primary winding i are connected in parallel with the first inductor, and two ends of the primary winding ii are connected in parallel with the second inductor.
Optionally, the three-phase high-gain converter further includes:
the main control unit is used for detecting one or more combinations of the voltage, the current, the voltage phase and the frequency of the output end of the three-phase high-gain converter and outputting a control signal according to the detected combination of one or more of the voltage, the current, the voltage phase and the frequency;
the driving unit is used for outputting a first modulation control signal, a second modulation control signal and a third modulation control signal according to the control signal; the first modulation control signal is transmitted to the third end of the first switch tube and controls the on-off of the first switch tube; the second modulation control signal is transmitted to the third end of the second switch tube and controls the on-off of the second switch tube; the third modulation control signal is transmitted to the third end of the third switching tube and controls the on-off of the third switching tube.
Optionally, the first switching tube is an MOS tube, a first end of the first switching tube is a drain of the MOS tube, a second end of the first switching tube is a source of the MOS tube, and a third end of the first switching tube is a gate of the MOS tube;
the second switch tube is an MOS tube, the first end of the second switch tube is a drain electrode of the MOS tube, the second end of the second switch tube is a source electrode of the MOS tube, and the third end of the second switch tube is a grid electrode of the MOS tube;
the third switching tube is an MOS tube, the first end of the third switching tube is a drain electrode of the MOS tube, the second end of the third switching tube is a source electrode of the MOS tube, and the third end of the third switching tube is a grid electrode of the MOS tube.
In a second aspect of the present invention, there is provided a control method for a three-phase high-gain converter in the first aspect of the present invention, including the steps of:
detecting the voltage, the current and the phase and frequency of the voltage at the output end of the three-phase high-gain converter, and outputting a control signal according to the detected voltage, current and voltage;
outputting a first modulation control signal, a second modulation control signal and a third modulation control signal according to the control signal; the first modulation control signal is transmitted to the third end of each first switch tube; the second modulation control signal is transmitted to the third end of each second switch tube; the third modulation control signal is transmitted to the third end of each third switching tube;
the three third switching tubes are controlled to be completely conducted through a third modulation control signal, the three first switching tubes are controlled to be switched on and off through the first modulation control signal, and the three second switching tubes are controlled to be switched on and off through the second modulation control signal, so that the three-phase high-gain converter performs rectification work;
the three first switching tubes are controlled to be completely conducted through the first modulation control signal, the three second switching tubes are controlled to be switched on and off through the second modulation control signal, and the three third switching tubes are controlled to be switched on and off through the third modulation control signal, so that the three-phase high-gain converter performs inversion operation.
Has the advantages that: according to the three-phase high-gain converter provided by the embodiment, the controllable switching device is used for replacing a traditional uncontrollable rectifying device, so that the influence of harmonic waves of a three-phase input power supply is effectively reduced; the three-phase rectification circuit and the three-phase inversion circuit share the second switch group, so that the number of switch devices can be reduced, and because the second switch group is shared, when all three third switch tubes are conducted, the first switch group and the second switch group are matched to carry out rectification work, and when all three first switch tubes are conducted, the second switch group and the third switch group are matched to carry out inversion work, so that the rectification work and the inversion work can be efficiently and programmatically designed, and the control precision is improved; all the switching tubes are controllable switching tubes, so that the PFC (power factor correction) function is performed on the input side of the circuit.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 shows a schematic structural diagram of a three-phase high-gain converter provided in this embodiment.
Fig. 2 shows an equivalent circuit diagram of a three-phase high-gain converter provided in this embodiment for performing rectification operation.
Fig. 3 shows a switching timing diagram of the three-phase high-gain converter provided in this embodiment for performing rectification operation.
Fig. 4 shows an equivalent circuit diagram of the inverter operation of the three-phase high-gain converter provided in this embodiment.
Fig. 5 shows a switching timing diagram of an inversion operation of the three-phase high-gain converter provided in this embodiment.
Reference numerals:
1. a first switch group; 2. a second switch group; 3. a third switch group; 4. a transformer;
s1a, a first switch tube I; s1b, a first switching tube II; s1c, a first switch tube III;
s2a, a second switch tube I; s2b, a second switching tube II; s2c, a second switch tube III;
s3a, a third switch tube I; s3b, a third switching tube II; s3c, a third switch tube III;
l1, a first inductor; l2 and a second inductor;
c1, a first capacitor;
l11, a primary winding I; l12, a primary winding II; l13, a primary winding III; l21, a secondary winding I; l22, a secondary winding II; l23, and a secondary winding III.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
As shown in fig. 1, a three-phase high-gain converter according to an embodiment of the disclosure includes a first switch group 1, a second switch group 2, a third switch group 3, a first capacitor C1, a transformer 4, a first inductor L1, a second inductor L2, a driving unit, and a main control unit.
The first switch group 1 comprises three first switch tubes, the types of the first switch tubes are MOS tubes, the first ends of the first switch tubes are drain electrodes of the MOS tubes, the second ends of the first switch tubes are source electrodes of the MOS tubes, and the third ends of the first switch tubes are grid electrodes of the MOS tubes; the three first switching tubes are respectively a first switching tube I S1a, a first switching tube II S1b and a first switching tube III S1c, and the first end of the first switching tube I S1a, the first end of the first switching tube II S1b and the first end of the first switching tube III S1c are connected with each other; the second end of the first switch tube IIS 1a is connected with the A of the three-phase power supply, the second end of the first switch tube IIS 1B is connected with the B of the three-phase power supply, and the second end of the first switch tube IIIS 1C is connected with the C of the three-phase power supply.
The second switch group 2 comprises three second switch tubes, the types of the second switch tubes are MOS tubes, the first ends of the second switch tubes are drain electrodes of the MOS tubes, the second ends of the second switch tubes are source electrodes of the MOS tubes, and the third ends of the second switch tubes are grid electrodes of the MOS tubes; the three second switching tubes are respectively a second switching tube IS 2a, a second switching tube IIS 2b and a second switching tube IIIS 2c; the first end of a second switching tube IIS 2a is connected with the second end of a first switching tube IIS 1a, the first end of a second switching tube IIS 2b is connected with the second end of a first switching tube IIS 1b, and the first end of a second switching tube IIIS 2c is connected with the second end of a first switching tube IIIS 1 c;
the third switch group 3 comprises three third switch tubes, the types of the third switch tubes are MOS tubes, the first ends of the third switch tubes are drains of the MOS tubes, the second ends of the third switch tubes are sources of the MOS tubes, and the third ends of the third switch tubes are grids of the MOS tubes; the three third switching tubes are respectively a third switching tube I S3a, a third switching tube II S3b and a third switching tube III S3c; the first end of a third switching tube I S3a, the first end of a third switching tube II S3b and the first end of a third switching tube III S3c are connected; the second end of the third switching tube IIS 3a is connected with the second end of the second switching tube IIS 2a, the second end of the third switching tube IIS 3b is connected with the second end of the second switching tube IIS 2b, and the second end of the third switching tube IIIS 3c is connected with the second end of the second switching tube IIIS 2 c.
When three third switching tubes of the third switching group 3 are all conducted, the first switching group 1 and the second switching group 2 form a three-phase rectification circuit; when all three first switch tubes of the first switch group 1 are conducted, the second switch group 2 and the third switch group 3 form a three-phase inverter circuit.
In the embodiment, two ends of each first switching tube are respectively connected with a reverse diode in parallel, and the diodes play a clamping role in a back electromotive force epsilon loop; the two ends of each first switch tube are respectively connected with a capacitor in parallel, and the capacitors and the first switch tubes are connected in parallel to form an anti-spark circuit, so that instantaneous high voltage generated when the first switches are switched on and off can be absorbed by the capacitor circuit, electric sparks at joints are effectively eliminated, and the service life of the joints of the first switch tubes is prolonged.
Similarly, two ends of each second switch tube are respectively connected with a reverse diode in parallel, and two ends of each second switch tube are respectively connected with a capacitor in parallel; two ends of each third switching tube are respectively connected with a reverse diode in parallel, and two ends of each third switching tube are respectively connected with a capacitor in parallel.
The first end of the first capacitor C1 is connected with the first end of the first switching tube, and the second end of the first capacitor C1 is connected with the first end of the third switching tube; the first capacitor C1 is a polar capacitor, a first terminal of the first capacitor C1 is a cathode of the polar capacitor, and a second terminal of the first capacitor C1 is an anode of the polar capacitor.
The transformer 4 comprises three primary windings and three secondary windings; the three primary windings are respectively a primary winding IL 11, a primary winding IIL 12 and a primary winding IIIL 13, and the three secondary windings are respectively a secondary winding IL 21, a secondary winding IIL 22 and a secondary winding IIIL 23.
The first end of the primary winding IL 11 is connected with the second end of the third switching tube IS 3a, and the second end of the primary winding IL 11 is connected with the first end of the primary winding IIL 12;
the first end of the primary winding IIL 12 is connected with the second end of the third switching tube IIS 3b, and the second end of the primary winding IIL 12 is connected with the first end of the primary winding III L13;
the first end of the primary winding IIIL 13 is connected with the second end of the third switching tube IIIS 3c, and the second end of the primary winding IIIL 13 is connected with the first end of the primary winding IL 11.
The second end of the secondary winding IL 21 is connected with the first end of the secondary winding IL 22, the second end of the secondary winding IL 22 is connected with the first end of the secondary winding IIIL 23, the first end of the secondary winding IL 21 and the second end of the secondary winding IIIL 23 form the output end of the three-phase high-gain converter, and direct current is output from the output end of the three-phase high-gain converter.
In this embodiment, the second end of the secondary winding iii L23 may further be connected to an impedance structure, the impedance structure is a vacuum cavity impedance structure, the impedance structure is equivalent to a first resistor, the second end of the secondary winding iii L23 is connected to the first end of the first resistor, and the second end of the first resistor is a port of the output end of the three-phase high-gain converter.
A first end of the first inductor L1 is connected with a first end of the primary winding IL 11, and a second end of the first inductor L1 is connected with a second end of the primary winding IL 11; a first end of the second inductor L2 is connected to a first end of the primary winding il 12, and a second end of the second inductor L2 is connected to a second end of the primary winding il 12.
The main control unit comprises a sampling module, the sampling module is used for detecting one or more combinations of the voltage, the current, the voltage phase and the frequency of the output end of the three-phase high-gain converter, and the main control unit outputs a control signal according to the detected combination of one or more of the voltage, the current, the voltage phase and the frequency;
the driving unit is used for outputting a first modulation control signal, a second modulation control signal and a third modulation control signal according to the control signal; the first modulation control signal is transmitted to the third end of the first switch tube and controls the on-off of the first switch tube; the second modulation control signal is transmitted to the third end of the second switching tube and controls the on-off of the second switching tube; the third modulation control signal is transmitted to the third end of the third switching tube and controls the on-off of the third switching tube.
An equivalent circuit diagram of the third switch group 3 when all the switch tubes are conducted is shown in fig. 2, at this time, the first switch group 1 and the second switch group 2 form a three-phase rectification circuit, and when all the three third switch tubes of the third switch group 3 are conducted, the source electrodes of the second switch tubes are at the same potential, so that the normal operation of rectification can be ensured; the first inductor L1 and the second inductor L2 function to protect the voltage transformer from short circuit when the switching tubes of the third switch group 3 are all turned on.
When the first switch group 1 and the second switch group 2 cooperate to perform the rectification operation, the timing diagram of the conduction of the switch tubes of the first switch group 1 and the second switch group 2 is shown in fig. 3, in which,uis the voltage, omega is the angular velocity,tas a matter of time, the time is,u a is the a-phase voltage of a three-phase power supply,u b is the B-phase voltage of a three-phase power supply,u c the voltage of the grid electrode of the first switching tube is the voltage of the grid electrode of the first switching tube I S1a, the first switching tube II S1b and the first switching tube III S1C, G1a, G1 b and G1C are the voltage of the grid electrode of the second switching tube I S2a, the second switching tube II S2b and the second switching tube III S2C; in one period, each first switch tube and each second switch tube are conducted for 120 degrees according to the sequence shown in figure 3.
Fig. 4 shows an equivalent circuit diagram of the first switch group 1 when all the switch tubes are turned on, at this time, the second switch group 2 and the third switch group 3 form a three-phase inverter circuit, all the three first switch tubes of the first switch group 1 are turned on, so that the drains of the three second switch tubes of the second switch group 2 are at the same potential, and at this time, the first capacitor C1 releases energy to ensure normal operation of the inverter.
When the second switch group 2 and the third switch group 3 cooperate to perform the inversion operation, the turn-on timing charts of the switching tubes of the second switch group 2 and the third switch group 3 are shown in fig. 5, where ω is the angular velocity, t is the time, G2a, 2b, 2c are the gate voltages of the second switching tube is S2a, the second switching tube is ii S2b, and the second switching tube is iii S2c, G3a, 3b, 3c are the gate voltages of the third switching tube is i S3a, the third switching tube is ii S3b, and the third switching tube is iii S3c, and each of the second switching tube and each of the third switching tube is turned on by 120 ° in the order shown in fig. 5 in one period.
According to the three-phase high-gain converter provided by the embodiment, the controllable switching device is used for replacing a traditional uncontrollable rectifying device, so that the influence of the harmonic wave of a three-phase input power supply is effectively reduced, and the influence of the harmonic wave of the input side of the three-phase high-gain converter is reduced; the three-phase rectification circuit and the three-phase inversion circuit share the second switch group 2, so that the number of switch devices can be reduced, and because the second switch group 2 is shared, when all three third switch tubes are conducted, the first switch group 1 and the second switch group 2 can be matched for rectification work, and when all three first switch tubes are conducted, the second switch group 2 and the third switch group 3 are matched for inversion work, so that the rectification work and the inversion work can be designed efficiently and programmatically, and the control precision is improved; if necessary, if single-phase output is required, the switching tube can be selectively designed to be switched on or switched off according to functional requirements. All the switching tubes are controllable switching tubes, so that the PFC (power factor correction) function is performed on the input side of the circuit.
The main control unit is provided with a sampling module, the switching operations of the switching tubes of the first switching group 1, the second switching group 2 and the third switching group 3 can be adjusted according to the detected voltage, current, voltage phase and frequency combination, and the three-phase inverter circuit can be adjusted so as to modulate the direct current and dynamically adjust the required frequency.
In addition, the transformer 4 in the three-phase high-gain converter can select a proper turn ratio according to actual requirements to enable the converter to have high gain, the circuit compatibility of the three-phase high-gain converter is high, and the three-phase high-gain converter can be easily combined with a circuit automatic control means.
Example 2
The embodiment provides a control method of a three-phase high-gain converter, which comprises the following steps:
detecting the voltage, the current and the phase and frequency of the voltage at the output end of the three-phase high-gain converter, and outputting a control signal according to the detected voltage, current and voltage;
outputting a first modulation control signal, a second modulation control signal and a third modulation control signal according to the control signal;
the first modulation control signal comprises a first modulation control signal I, a first modulation control signal II and a first modulation control signal III, the first modulation control signal I is transmitted to the third end of the first switch tube IIS 1a, the first modulation control signal II is transmitted to the third end of the first switch tube IIS 1b, and the first modulation control signal III is transmitted to the third end of the first switch tube IIIS 1 c;
the second modulation control signal comprises a second modulation control signal I, a second modulation control signal II and a second modulation control signal III, the second modulation control signal I is transmitted to a third end of the second switching tube IIS 2a, the second modulation control signal II is transmitted to a third end of the second switching tube IIS 2b, and the second modulation control signal III is transmitted to a third end of the second switching tube IIIS 2c;
the third modulation control signal comprises a third modulation control signal I, a third modulation control signal II and a third modulation control signal III, the third modulation control signal I is transmitted to a third end of a third switching tube I S3a, the third modulation control signal II is transmitted to a third end of a third switching tube II S3b, and the third modulation control signal III is transmitted to a third end of a third switching tube III S3c;
the three third switching tubes are controlled to be completely conducted through the third modulation control signal, the on-off of the three first switching tubes is orderly controlled through the first modulation control signal, and the on-off of the three second switching tubes is orderly controlled through the second modulation control signal, so that the three-phase high-gain converter performs rectification work;
the three first switching tubes are controlled to be completely conducted through the first modulation control signal, the three second switching tubes are controlled to be switched on and off sequentially through the second modulation control signal, and the three third switching tubes are controlled to be switched on and off sequentially through the third modulation control signal, so that the three-phase high-gain converter can carry out inversion operation.
When the first switch group 1 and the second switch group 2 cooperate to perform the rectification operation, the timing diagram of the conduction of the switch tubes of the first switch group 1 and the second switch group 2 is shown in fig. 3, in which,uis the voltage, ω is the angular velocity, t is the time,u a is the a-phase voltage of a three-phase power supply,u b is the B-phase voltage of a three-phase power supply,u c the voltage of the grid electrode of the first switching tube is the voltage of the grid electrode of the first switching tube I S1a, the first switching tube II S1b and the first switching tube III S1C, G1a, G1 b and G1C are the voltage of the grid electrode of the second switching tube I S2a, the second switching tube II S2b and the second switching tube III S2C; within one periodAnd each first switch tube and each second switch tube are conducted for 120 degrees according to the sequence shown in figure 3.
When the second switch group 2 and the third switch group 3 cooperate to perform the inversion operation, the turn-on timing charts of the switching tubes of the second switch group 2 and the third switch group 3 are shown in fig. 5, where ω is the angular velocity, t is the time, G2a, 2b, 2c are the gate voltages of the second switching tube is S2a, the second switching tube is ii S2b, and the second switching tube is iii S2c, G3a, 3b, 3c are the gate voltages of the third switching tube is i S3a, the third switching tube is ii S3b, and the third switching tube is iii S3c, and each of the second switching tube and each of the third switching tube is turned on by 120 ° in the order shown in fig. 5 in one period.
In the control method of the three-phase high-gain converter provided in this embodiment, the third switching tube is controlled to be fully turned on to perform rectification operation, and then the first switching tube is controlled to be fully turned on to perform inversion operation.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried out in the method of implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (6)

1. A three-phase high gain converter, comprising:
the first switch group (1) comprises three first switch tubes, and the first ends of the three first switch tubes are connected; second ends of the three first switching tubes are respectively connected with an A phase, a B phase and a C phase of the three-phase power supply;
the second switch group (2) comprises three second switch tubes, and the first end of each second switch tube is connected with the second end of one first switch tube;
the third switch group (3) comprises three third switch tubes, and the second end of each third switch tube is connected with the second end of one second switch tube; the first ends of the three third switching tubes are connected;
a first end of the first capacitor (C1) is connected with a first end of the first switching tube, and a second end of the first capacitor (C1) is connected with a first end of the third switching tube;
the input end of the transformer (4) is connected with the second end of the third switching tube;
when three third switching tubes of the third switching group (3) are all conducted, the first switching group (1) and the second switching group (2) form a three-phase rectification circuit; when all three first switching tubes of the first switching group (1) are conducted, the second switching group (2) and the third switching group (3) form a three-phase inverter circuit.
2. A three-phase high gain converter according to claim 1, characterized in that the transformer (4) comprises a primary winding i (L11), a primary winding ii (L12), a primary winding iii (L13), a secondary winding i (L21), a secondary winding ii (L22) and a secondary winding iii (L23);
the three third switching tubes are respectively a third switching tube I (S3 a), a third switching tube II (S3 b) and a third switching tube III (S3 c);
the first end of the primary winding I (L11) is connected with the second end of the third switching tube I (S3 a), and the second end of the primary winding I (L11) is connected with the first end of the primary winding II (L12);
the first end of the primary winding II (L12) is connected with the second end of the third switching tube II (S3 b), and the second end of the primary winding II (L12) is connected with the first end of the primary winding III (L13);
a first end of the primary winding III (L13) is connected with a second end of the third switching tube III (S3 c), and a second end of the primary winding III (L13) is connected with a first end of the primary winding I (L11);
the second end of the secondary winding I (L21) is connected with the first end of the secondary winding II (L22), the second end of the secondary winding II (L22) is connected with the first end of the secondary winding III (L23), and the first end of the secondary winding I (L21) and the second end of the secondary winding III (L23) form the output end of the three-phase high-gain converter.
3. A three-phase high gain converter according to claim 2, characterized in that the two ends of the primary winding i (L11) are connected in parallel with the first inductor (L1), and the two ends of the primary winding ii (L12) are connected in parallel with the second inductor (L2).
4. A three-phase high gain converter according to claim 2 or 3, further comprising:
the main control unit is used for detecting the voltage, the current, the voltage phase and the frequency of the output end of the three-phase high-gain converter and outputting a control signal according to the detected voltage, current, voltage phase and frequency;
the driving unit is used for outputting a first modulation control signal, a second modulation control signal and a third modulation control signal according to the control signal; the first modulation control signal is transmitted to the third end of the first switch tube and controls the on-off of the first switch tube; the second modulation control signal is transmitted to the third end of the second switch tube and controls the on-off of the second switch tube; the third modulation control signal is transmitted to the third end of the third switching tube and controls the on-off of the third switching tube.
5. A three-phase high gain converter according to any of claims 1 to 3,
the first switch tube is an MOS tube, the first end of the first switch tube is a drain electrode of the MOS tube, the second end of the first switch tube is a source electrode of the MOS tube, and the third end of the first switch tube is a grid electrode of the MOS tube;
the second switch tube is an MOS tube, the first end of the second switch tube is a drain electrode of the MOS tube, the second end of the second switch tube is a source electrode of the MOS tube, and the third end of the second switch tube is a grid electrode of the MOS tube;
the third switching tube is an MOS tube, the first end of the third switching tube is a drain electrode of the MOS tube, the second end of the third switching tube is a source electrode of the MOS tube, and the third end of the third switching tube is a grid electrode of the MOS tube.
6. A method of controlling a three-phase high-gain converter according to claim 5, comprising the steps of:
detecting one or more combinations of the voltage, the current, the voltage phase and the frequency of the output end of the three-phase high-gain converter, and outputting a control signal according to the detected one or more combinations of the voltage, the current, the voltage phase and the frequency;
outputting a first modulation control signal, a second modulation control signal and a third modulation control signal according to the control signal; the first modulation control signal is transmitted to the third end of each first switch tube; the second modulation control signal is transmitted to the third end of each second switch tube; the third modulation control signal is transmitted to the third end of each third switching tube;
the three third switching tubes are controlled to be completely conducted through the third modulation control signal, the three first switching tubes are controlled to be switched on and off through the first modulation control signal, and the three second switching tubes are controlled to be switched on and off through the second modulation control signal, so that the three-phase high-gain converter performs rectification work;
the three first switching tubes are controlled to be completely conducted through the first modulation control signal, the three second switching tubes are controlled to be switched on and off through the second modulation control signal, and the three third switching tubes are controlled to be switched on and off through the third modulation control signal, so that the three-phase high-gain converter performs inversion operation.
CN202211506625.6A 2022-11-29 2022-11-29 Three-phase high-gain converter and control method thereof Active CN115528921B (en)

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CN108631605A (en) * 2018-08-03 2018-10-09 三峡大学 A kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number
CN108988676A (en) * 2018-09-19 2018-12-11 南京航空航天大学 A kind of single stage type isolation type bidirectional AC-DC converter
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JP2021175306A (en) * 2020-04-28 2021-11-01 Tdk株式会社 Switching power supply device and power supply system
CN114070083A (en) * 2021-10-13 2022-02-18 华为技术有限公司 DC/DC converter and output voltage control method thereof
CN115021538A (en) * 2022-08-08 2022-09-06 深圳市恒运昌真空技术有限公司 Drive circuit for three-phase DC-DC converter, three-phase DC-DC converter and drive method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561595A (en) * 1995-03-24 1996-10-01 Magl Power Inc. Power inverter with input line conditioning
CN103683964A (en) * 2013-12-20 2014-03-26 华为技术有限公司 Resonant bidirectional transducer, uninterruptible power supply device and control method
CN111164872A (en) * 2018-01-23 2020-05-15 华为技术有限公司 Power converter
CN108631605A (en) * 2018-08-03 2018-10-09 三峡大学 A kind of three level isolated form DC/DC converters of adjustable large capacity height boosting of bridge arm number
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