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CN115528897B - Resonant converter and control method thereof - Google Patents

Resonant converter and control method thereof Download PDF

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Publication number
CN115528897B
CN115528897B CN202211506964.4A CN202211506964A CN115528897B CN 115528897 B CN115528897 B CN 115528897B CN 202211506964 A CN202211506964 A CN 202211506964A CN 115528897 B CN115528897 B CN 115528897B
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China
Prior art keywords
switching
capacitor
control signal
tube
diode
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CN202211506964.4A
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Chinese (zh)
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CN115528897A (en
Inventor
乐卫平
乐子毅
谢幸光
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/01—Resonant DC/DC converters
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • 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
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a resonant converter and a control method thereof, and the resonant converter comprises: the first ends of three first switch tubes of the first switch group are connected; the first end of each second switch tube is connected with the second end of one first switch tube; the first end of each third switching tube of the third switching group is respectively connected with the second end of one second switching tube; the first ends of the three third switching tubes are connected; the input end of the resonant network is connected with the second end of the first switching tube, and the output end of the resonant network is connected with 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 inverter 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 second three-phase rectification circuit. The resonant converter can effectively reduce the voltage ripple of the output side and the current ripple of the output side.

Description

Resonant converter and control method thereof
Technical Field
The invention relates to the technical field of converters, in particular to a resonant converter and a control method thereof.
Background
The resonant converter is a direct current-direct current converter developed by utilizing a soft switching technology, and the switching tube can be switched on and off under zero voltage by establishing a resonant circuit, so that the resonant converter has the advantages of good isolation performance, low loss, multi-output direct current power supply and the like. The rectification side of the output end of the traditional resonant converter adopts an uncontrollable rectifier diode, so that the ripple of the output side is large.
Disclosure of Invention
An object of the present invention is to provide a resonant 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, there is provided a resonant converter comprising:
the first switch group comprises three first switch tubes, and the first ends of the three first switch tubes are connected;
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 third switching group comprises three third switching tubes, and the first end of each third switching tube is connected with the second end of one second switching tube; the second ends of the three third switching tubes are connected;
the input end of the resonant network is connected with the second end of the first switching tube, and the output end of the resonant network is connected with 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 inverter circuit; when the three first switching tubes of the first switching group are all conducted, the second switching group and the third switching group form a second three-phase rectification circuit;
the first end of the first switching tube and the second end of the third switching tube form the output end of the resonant converter.
Optionally, the three-phase alternating current power supply further comprises a first rectifying circuit, wherein the first rectifying circuit is used for converting three-phase alternating current into direct current;
the first end of the first switching tube is connected with the first end of the first rectifying circuit;
and the second end of the third switching tube is connected with the second end of the first rectifying circuit.
Optionally, the resonant network comprises a primary unit and a secondary unit;
the primary unit comprises a primary winding, a first capacitor and a second capacitor, wherein a first end of the primary winding is connected with a first end of the first capacitor, a second end of the first capacitor is connected with a first end of the second capacitor, and a second end of the second capacitor is connected with a second end of the primary winding; the first end of the primary winding is the first end of the primary unit, and the first end of the second capacitor is the second end of the primary unit;
the secondary unit comprises a secondary winding, a third capacitor and a fourth capacitor, wherein the first end of the secondary winding is connected with the first end of the third capacitor, the second end of the third capacitor is connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is connected with the second end of the secondary winding; the first end of the secondary winding is the first end of the secondary unit, and the first end of the fourth capacitor is the second end of the secondary unit;
the number of the primary units is three, and the three primary units are a primary unit I, a primary unit II and a primary unit III respectively; the number of the secondary units is three, and the secondary units are respectively a secondary unit I, a secondary unit II and a secondary unit III;
the second end of the primary unit I is connected with the first end of the primary unit II, the second end of the primary unit II is connected with the first end of the primary unit III, and the second end of the primary unit III is connected with the first end of the primary unit I;
the second end of the secondary unit I is connected with the first end of the secondary unit II, the second end of the secondary unit II is connected with the first end of the secondary unit III, and the second end of the secondary unit III is connected with the first end of the secondary unit I;
the first end of each primary unit is connected with the second end of a first switching tube respectively;
the first end of each secondary unit is connected with the first end of a third switching tube respectively.
Optionally, the first terminal of each primary unit is connected to the second terminal of a first switching tube through a first inductor.
Optionally, the first terminal of each secondary unit is connected to the first terminal of a third switching tube through a second inductor.
Optionally, the first rectifying circuit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, and a sixth diode;
the anode of the first diode is connected with the cathode of the second diode, the anode of the third diode is connected with the cathode of the fourth diode, and the anode of the fifth diode is connected with the cathode of the sixth diode;
the cathode of the first diode, the cathode of the third diode and the cathode of the fifth diode are connected, and the cathode of the fifth diode is the first end of the first rectifying circuit;
and the anode of the second diode, the anode of the fourth diode and the anode of the sixth diode are connected, and the anode of the sixth diode is the second end of the first rectifying circuit.
Optionally, the method 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 resonant 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 rectifier circuit further includes a fifth capacitor, a first end of the fifth capacitor is connected to the first end of the first rectifier circuit, and a second end of the fifth capacitor is connected to the second end of the first rectifier circuit.
Optionally, a fuse is arranged between the first end of the first rectifying circuit and the first end of the first switching tube; and a fuse is arranged between the second end of the first rectifying circuit and the second end of the third switching tube.
Optionally, a fuse is disposed between the first end of the first rectification circuit and the first end of the first switching tube.
In a second aspect, there is provided a control method of a resonant converter according to the first aspect, including 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 resonant converter by using the main control unit, 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 by using a driving unit 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 switched off through the first modulation control signal, and the three second switching tubes are controlled to be switched on and switched off through the second modulation control signal, so that the resonant converter performs inversion 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 resonant converter performs rectification work.
Has the advantages that: according to the resonant converter provided by the invention, the uncontrollable diodes of the three-phase inverter circuit and the second rectifying circuit at the output side in the traditional converter are changed into the first switch group, the second switch group and the third switch group in the embodiment, the first switch group, the second switch group and the third switch group are all composed of controllable switch tubes, the three-phase inverter circuit and the second rectifying circuit share the second switch group, the second rectifying circuit is a controllable rectifying circuit, the control precision is improved, and the voltage ripple at the output side and the current ripple at the output side are effectively reduced; meanwhile, the number of the switching devices can be effectively reduced by sharing the switch group.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
Fig. 1 is a schematic structural diagram of a resonant converter provided in this embodiment.
Fig. 2 is an equivalent circuit diagram of the resonant converter according to the present embodiment.
Fig. 3 is an equivalent circuit diagram of the resonant converter according to the present embodiment for performing rectification operation.
Reference numerals:
1. a first switch group; 2. a second switch group; 3. a third switch group; 4. a resonant network;
d1, a first diode; d2, a second diode; d3, a third diode; d4, a fourth diode; d5, a fifth diode; d6, a sixth diode;
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;
l1a and a first inductor I; l1b and a first inductor II; l1c and a first inductor III;
l2a and a second inductor I; l2b and a second inductor II; l2c and a second inductor III;
l3, a third inductor;
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, a secondary winding III;
c1a and a first capacitor I; c1b and a first capacitor II; C1C and a first capacitor III;
c2a and a second capacitor I; c2b and a second capacitor II; C2C and a second capacitor III;
c3a and a third capacitor I; c3b and a third capacitor II; C3C and a third capacitor III;
c4a and a fourth capacitor I; c4b and a fourth capacitor II; C4C and a fourth capacitor III;
c5, a fifth capacitor; c6, a sixth capacitor; c7, a seventh capacitor;
f1, a first fuse; f2, a second fuse; r1 and a first resistor.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The present embodiment provides a resonant converter, which includes a first switch group 1, a second switch group 2, a third switch group 3, a resonant network 4, a first rectification circuit, a main control unit, and a driving unit.
The first switch group 1 comprises three first switch tubes, and the first ends of the three first switch tubes are connected;
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 first end of each third switch tube is connected with the second end of one second switch tube; the second ends of the three third switching tubes are connected;
the input end of the resonant network 4 is connected with the second end of the first switching tube, and the output end of the resonant network 4 is connected with the first end of the third switching tube;
when the three third switching tubes are all conducted, the first switching group 1 and the second switching group 2 form a three-phase inverter circuit; when the three first switching tubes are all conducted, the second switching group 2 and the third switching group 3 form a second three-phase rectification circuit;
the first end of the first switching tube and the second end of the third switching tube form the output end of the resonant converter.
The first rectifying circuit is used for converting three-phase alternating current into direct current; the first end of the first switching tube is connected with the first end of the first rectifying circuit; and the second end of the third switching tube is connected with the second end of the first rectifying circuit.
The resonant network 4 comprises a primary unit and a secondary unit;
the primary unit comprises a primary winding, a first capacitor and a second capacitor, wherein a first end of the primary winding is connected with a first end of the first capacitor, a second end of the first capacitor is connected with a first end of the second capacitor, and a second end of the second capacitor is connected with a second end of the primary winding; the first end of the primary winding is the first end of the primary unit, and the first end of the second capacitor is the second end of the primary unit;
the secondary unit comprises a secondary winding, a third capacitor and a fourth capacitor, wherein the first end of the secondary winding is connected with the first end of the third capacitor, the second end of the third capacitor is connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is connected with the second end of the secondary winding; the first end of the secondary winding is the first end of the secondary unit, and the first end of the fourth capacitor is the second end of the secondary unit;
the number of the primary units is three, namely a primary unit I, a primary unit II and a primary unit III; the number of the secondary units is three, and the secondary units are respectively a secondary unit I, a secondary unit II and a secondary unit III;
the second end of the primary unit I is connected with the first end of the primary unit II, the second end of the primary unit II is connected with the first end of the primary unit III, and the second end of the primary unit III is connected with the first end of the primary unit I;
the second end of the secondary unit I is connected with the first end of the secondary unit II, the second end of the secondary unit II is connected with the first end of the secondary unit III, and the second end of the secondary unit III is connected with the first end of the secondary unit I;
the first end of each primary unit is connected with the second end of a first switching tube respectively;
the first end of each secondary unit is respectively connected with the first end of a third switching tube.
The first end of each primary unit is connected with the second end of a first switching tube through a first inductor, and the first end of each secondary unit is connected with the first end of a third switching tube through a second inductor.
The first rectifying circuit comprises a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6;
the anode of the first diode D1 is connected with the cathode of the second diode D2, the anode of the third diode D3 is connected with the cathode of the fourth diode D4, and the anode of the fifth diode D5 is connected with the cathode of the sixth diode D6;
the cathode of the first diode D1, the cathode of the third diode D3 and the cathode of the fifth diode D5 are connected, and the cathode of the fifth diode D5 is the first end of the first rectifying circuit;
the anode of the second diode D2, the anode of the fourth diode D4 and the anode of the sixth diode D6 are connected, and the anode of the sixth diode D6 is the second end of the first rectifying circuit.
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 resonant 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 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.
The driving unit controls the three third switching tubes to be completely conducted through a third modulation control signal, controls the three first switching tubes to be switched on and off through the first modulation control signal, and controls the three second switching tubes to be switched on and off through the second modulation control signal, so that the resonant converter performs inversion work; and then the first modulation control signals control the three first switching tubes to be completely conducted, the second modulation control signals control the three second switching tubes to be switched on and off, and the third modulation control signals control the three third switching tubes to be switched on and off, so that the resonant converter performs rectification operation.
The resonant converter further comprises a fifth capacitor C5, wherein the first end of the fifth capacitor C5 is connected with the first end of the first rectifying circuit, and the second end of the fifth capacitor C5 is connected with the second end of the first rectifying circuit.
A fuse is arranged between the first end of the first rectifying circuit and the first end of the first switching tube; a fuse is arranged between the second end of the first rectifying circuit and the second end of the third switching tube; a fuse is arranged between the first end of the first rectifying circuit and the first end of the first switching tube.
Example 2
As shown in fig. 1, the disclosed embodiment of the present invention provides a resonant converter, which includes a first switch group 1, a second switch group 2, a third switch group 3, a resonant network 4, a first rectification circuit, a main control unit, and a driving unit.
The first rectifying circuit comprises six diodes which are respectively a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6; the cathode of the first diode D1, the cathode of the third diode D3 and the cathode of the fifth diode D5 are connected with the first bus; the cathode of the second diode D2 is connected with the anode of the first diode D1, the cathode of the fourth diode D4 is connected with the anode of the third diode D3, and the cathode of the sixth diode D6 is connected with the anode of the fifth diode D5; the anode of the second diode D2, the anode of the fourth diode D4, and the anode of the sixth diode D6 are connected to the second bus bar. The first rectifying circuit is connected with a three-phase power supply and outputs direct current; the three-phase power supply comprises a U phase, a V phase and a W phase, wherein the U phase is connected with the anode of the first diode D1, the V phase is connected with the anode of the third diode D3, and the W phase is connected with the anode of the fifth diode D5.
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 switch tubes are respectively a first switch tube I S1a, a first switch tube II S1b and a first switch tube III S1c, and the first end of the first switch tube I S1a, the first end of the first switch tube II S1b and the first end of the first switch tube III S1c are connected with each other.
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 switch tubes are respectively a second switch tube I S2a, a second switch tube II S2b and a second switch tube III S2c, the first end of the second switch tube I S2a is connected with the second end of the first switch tube I S1a, the first end of the second switch tube II S2b is connected with the second end of the first switch tube II S1b, and the first end of the second switch tube III S2c is connected with the second end of the first switch tube III S1 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 IS 3a is connected with the second end of a second switching tube IS 2a, the first end of a third switching tube IIS 3b is connected with the second end of a second switching tube IIS 2b, the first end of a third switching tube III S3c is connected with the second end of a second switching tube III S2c, and the second end of the third switching tube IS 3a, the second end of the third switching tube II S3b and the second end of the third switching tube III S3c are connected.
As shown in fig. 2, when the third switching tubes are all turned on, the first switching group 1 and the second switching group 2 form a three-phase inverter circuit; as shown in fig. 3, when the first switch group 1 is fully turned on, the second switch group 2 and the third switch group 3 constitute a second three-phase rectification circuit;
the resonant network 4 comprises three primary units and three secondary units; the three primary units have the same structure and are respectively a primary unit I, a primary unit II and a primary unit III; the three secondary units have the same structure, and are respectively a secondary unit I, a secondary unit II and a secondary unit III.
The primary unit I comprises a primary winding IL 11, a first capacitor IC 1a and a second capacitor IC 2a, wherein a first end of the primary winding IL 11 is connected with a first end of the first capacitor IC 1a, a second end of the first capacitor IC 1a is connected with a first end of the second capacitor IC 2a, and a second end of the second capacitor IC 2a is connected with a second end of the primary winding IL 11; the first end of the primary winding IL 11 is the first end of the primary unit I, and the first end of the second capacitor IC 2a is the second end of the primary unit I; the first end of the primary unit I is connected with the second end of the first switching tube IS 1a through a first inductor IL 1 a.
The primary unit II comprises a primary winding IIL 12, a first capacitor IIC 1b and a second capacitor IIC 2b, wherein the first end of the primary winding IIL 12 is connected with the first end of the first capacitor IIC 1b, the second end of the first capacitor IIC 1b is connected with the first end of the second capacitor IIC 2b, and the second end of the second capacitor IIC 2b is connected with the second end of the primary winding IIL 12; the first end of the primary winding IIL 12 is a first end of the primary unit II, and the first end of the second capacitor IIC 2b is a second end of the primary unit II; the first end of the primary unit II is connected with the second end of the primary unit I. The first end of the primary unit II is connected with the second end of the first switching tube IIS 1b through a first inductor IIL 1 b.
The primary unit III comprises a primary winding III L13, a first capacitor III C1C and a second capacitor III C2C, a first end of the primary winding III L13 is connected with a first end of the first capacitor III C1C, a second end of the first capacitor III C1C is connected with a first end of the second capacitor III C2C, and a second end of the second capacitor III C2C is connected with a second end of the primary winding III L13; the first end of the primary winding III L13 is the first end of the primary unit III, and the first end of the second capacitor IIIC 2C is the second end of the primary unit III; the first end of primary unit III is connected with the second end of primary unit II, and the second end of primary unit III is connected with the first end of primary unit I. The first end of the primary unit III is connected with the second end of the first switching tube IIIS 1c through a first inductor IIIL 1 c.
The secondary unit I comprises a secondary winding IL 21, a third capacitor IC 3a and a fourth capacitor IC 4a; a first end of the secondary winding IL 21 is connected with a first end of a third capacitor IC 3a, a second end of the third capacitor IC 3a is connected with a first end of a fourth capacitor IC 4a, and a second end of the fourth capacitor IC 4a is connected with a second end of the secondary winding IL 21; the first terminal of the secondary winding il 21 is the first terminal of the secondary unit i, the first terminal of the fourth capacitor ic 4a is the second terminal of the secondary unit i, and the secondary winding il 21 is coupled to the primary winding il 11. The first end of the secondary unit I is connected with the first end of a third switching tube IS 3a through a second inductor IL 2 a.
The secondary unit II comprises a secondary winding IIL 22, a third capacitor IIC 3b and a fourth capacitor IIC 4b; the first end of the secondary winding IIL 22 is connected with the first end of a third capacitor IIC 3b, the second end of the third capacitor IIC 3b is connected with the first end of a fourth capacitor IIC 4b, and the second end of the fourth capacitor IIC 4b is connected with the second end of the secondary winding IIL 22; the first end of the secondary winding IIL 22 is the first end of the secondary unit II, and the first end of the fourth capacitor IIC 4b is the second end of the secondary unit II; the first end of the secondary unit II is connected with the second end of the secondary unit I; the secondary winding il 22 is coupled to the primary winding il 12. The first end of the secondary unit II is connected with the first end of a third switching tube IIS 3b through a second inductor IIL 2 b.
The secondary unit III comprises a secondary winding III L23, a third capacitor III C3C and a fourth capacitor III C4C; the first end of the secondary winding III L23 is connected with the first end of a third capacitor IIIC 3C, the second end of the third capacitor IIIC 3C is connected with the first end of a fourth capacitor IIIC 4C, and the second end of the fourth capacitor IIIC 4C is connected with the second end of the secondary winding III L23; the first end of the secondary winding III L23 is the first end of the secondary unit III, and the first end of the fourth capacitor IIIC 4C is the second end of the secondary unit III; the first end of the secondary unit III is connected with the second end of the secondary unit II, and the second end of the secondary unit III is connected with the first end of the secondary unit I; the secondary winding ill L23 is coupled to the primary winding ill L13. The first end of the secondary unit III is connected with the first end of the third switching tube III S3c through a second inductor III L2 c.
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 resonant 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;
and 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 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 2 c;
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 IS 3a, the third modulation control signal II is transmitted to a third end of a third switching tube IIS 3b, and the third modulation control signal III is transmitted to a third end of a third switching tube IIIS 3c;
the third modulation control signal controls the three third switching tubes to be completely conducted, so that the second ends of the three second switching tubes of the second switching group 2 are ensured to be at the same potential, and the normal operation of inversion operation is ensured; the on-off of the three first switch tubes is controlled by the first modulation control signal, and the on-off of the three second switch tubes is controlled by the second modulation control signal, so that the resonant converter performs inversion operation;
and then the first modulation control signal controls the three first switch tubes to be conducted completely to ensure that the first ends of the second switch group 2 are at the same electric potential so as to ensure the normal operation of rectification, the second modulation control signal controls the on-off of the three second switch tubes, and the third modulation control signal controls the on-off of the three third switch tubes so as to ensure the rectification operation of the resonant converter.
As a further improvement of this embodiment, the inductor further includes a third inductor L3, a seventh capacitor C7, and a first resistor R1; a first end of a third inductor L3 is connected with a first end of the first switching tube, and a second end of the third inductor L3 is one of output ports of the resonant converter; the seventh capacitor C7 is connected in parallel to two ends of the third inductor L3. A first end of the first resistor R1 is connected with a second end of the third switching tube, and the second end of the first resistor R1 is the other output port of the resonant converter; the second end of the third inductor L3 and the second end of the first resistor R1 form an output end of the resonant converter, the output end of the resonant converter outputs direct current, the second end of the third inductor L3 outputs a positive electrode, and the second end of the first resistor R1 outputs a negative electrode.
As a further improvement of this embodiment, the third switch further includes a fifth capacitor C5 and a sixth capacitor C6, a first end of the fifth capacitor C5 is connected to a cathode of the fifth diode D5, a second end of the fifth capacitor C5 is connected to an anode of the sixth diode D6, a first end of the sixth capacitor C6 is connected to the first end of the first switch, and a second end of the sixth capacitor C6 is connected to the second end of the third switch. A first end of the fifth capacitor C5 is connected to a first end of the sixth capacitor C6 through the first fuse F1, and a second end of the fifth capacitor C5 is connected to a second end of the sixth capacitor C6 through the second fuse F2. The fifth capacitor C5 is used for filtering and improving the power factor, the sixth capacitor C6 is used for secondary noise reduction, and the capacitive reactance of the fifth capacitor C5 is higher than that of the sixth capacitor C6; the fifth capacitor C5 is used for passing low frequency, the sixth capacitor C6 is used for passing high frequency, and the combination of the fifth capacitor C5 and the sixth capacitor C6 can fully filter high frequency and low frequency.
The resonant converter provided by this embodiment changes the uncontrollable diodes of the three-phase inverter circuit and the second rectifier circuit on the output side in the conventional converter into the first switch group 1, the second switch group 2 and the third switch group 3 in this embodiment, the first switch group 1, the second switch group 2 and the third switch group 3 are all composed of controllable switch tubes, the three-phase inverter circuit and the second rectifier circuit share the second switch group 2, the second rectifier circuit is a controllable rectifier circuit, the control precision is improved, and the voltage ripple on the output side and the current ripple on the output side are effectively reduced; meanwhile, the number of switching devices can be effectively reduced by sharing the switch group; the three-phase inverter circuit is provided with a main control unit and a driving unit, a control signal can be output according to the detected combination of one or more of the voltage, the current, the voltage phase and the frequency, the driving unit can adjust the work of each switch of the three-phase inverter circuit and the second three-phase rectifier circuit according to the control signal, the frequency modulation of the three-phase inverter circuit on direct current can be adjusted, the required frequency can be dynamically adjusted, and the control precision is improved; the resonant network 4 adopts a bidirectional LCC-L resonant network 4, the network has perfect symmetry, can operate at a fixed frequency point, achieves the required power factor, and can effectively reduce the voltage and current stress of the device. The first inductors L1a, L1b and L1C and the second inductors L1a, L1b and L1C are arranged, and the first inductors L1a, L1b and L1C are used for protecting the first capacitors C1a, C1b and C1C of the resonant network 4 from short circuit when the first switch tubes of the first switch group 1 are all conducted; the second inductors L1a, L1b, L1C function to protect the third capacitors C3a, C3b, C3C of the resonant network 4 from short-circuiting when the third switching transistors of the third switching group 3 are all turned on.
Meanwhile, the resonant converter provided by the embodiment has high circuit compatibility, is easy to expand and can be easily combined with an automatic circuit control means.
Example 3
The present implementation provides a method for controlling a resonant converter, including 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 resonant converter by using the main control unit, 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 by using a driving unit 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 third modulation control signal controls the three third switching tubes to be completely conducted, the first modulation control signal controls the three first switching tubes to be switched on and switched off, the second modulation control signal controls the three second switching tubes to be switched on and switched off, so that the resonant converter performs inversion operation, and an equivalent circuit diagram of the first switching group and the second switching group performing the inversion operation is shown in fig. 2.
Then, the first modulation control signal controls the three first switch tubes to be completely conducted, the second modulation control signal controls the three second switch tubes to be turned on and off, the third modulation control signal controls the three third switch tubes to be turned on and off, so that the resonant converter performs rectification, and an equivalent circuit diagram of the second switch group and the third switch group performing rectification is shown in fig. 3.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (11)

1. A resonant converter, comprising:
the first switch group (1) comprises three first switch tubes, and the first ends of the three first switch tubes are connected;
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 first end of each third switch tube is connected with the second end of one second switch tube; the second ends of the three third switching tubes are connected;
the input end of the resonant network (4) is connected with the second end of the first switching tube, and the output end of the resonant network (4) is connected with the first end of the third switching tube;
when the 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 inverter circuit; when the three first switching tubes of the first switching group (1) are all conducted, the second switching group (2) and the third switching group (3) form a second three-phase rectification circuit;
the first end of the first switching tube and the second end of the third switching tube form the output end of the resonant converter;
the type of the first switch tube is an MOS tube, the first end of the first switch tube is a drain electrode of the MOS tube, and the second end of the first switch tube is a source electrode of the MOS tube;
the type of the second switching tube is an MOS tube, the first end of the second switching tube is a drain electrode of the MOS tube, and the second end of the second switching tube is a source electrode of the MOS tube;
the type of the third switching tube is an MOS tube, the first end of the third switching tube is a drain electrode of the MOS tube, and the second end of the third switching tube is a source electrode of the MOS tube.
2. A resonant converter according to claim 1, further comprising a first rectifying circuit for converting three-phase alternating current to direct current;
the first end of the first switching tube is connected with the first end of the first rectifying circuit;
and the second end of the third switching tube is connected with the second end of the first rectifying circuit.
3. A resonant converter according to claim 2, characterized in that the resonant network (4) comprises a primary unit and a secondary unit;
the primary unit comprises a primary winding, a first capacitor and a second capacitor, wherein a first end of the primary winding is connected with a first end of the first capacitor, a second end of the first capacitor is connected with a first end of the second capacitor, and a second end of the second capacitor is connected with a second end of the primary winding; the first end of the primary winding is a first end of the primary unit, and the first end of the second capacitor is a second end of the primary unit;
the secondary unit comprises a secondary winding, a third capacitor and a fourth capacitor, wherein the first end of the secondary winding is connected with the first end of the third capacitor, the second end of the third capacitor is connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is connected with the second end of the secondary winding; the first end of the secondary winding is the first end of the secondary unit, and the first end of the fourth capacitor is the second end of the secondary unit;
the number of the primary units is three, and the three primary units are a primary unit I, a primary unit II and a primary unit III respectively; the number of the secondary units is three, and the secondary units are respectively a secondary unit I, a secondary unit II and a secondary unit III;
the second end of the primary unit I is connected with the first end of the primary unit II, the second end of the primary unit II is connected with the first end of the primary unit III, and the second end of the primary unit III is connected with the first end of the primary unit I;
the second end of the secondary unit I is connected with the first end of the secondary unit II, the second end of the secondary unit II is connected with the first end of the secondary unit III, and the second end of the secondary unit III is connected with the first end of the secondary unit I;
the first end of each primary unit is connected with the second end of a first switching tube respectively;
the first end of each secondary unit is respectively connected with the first end of a third switching tube.
4. A resonant converter according to claim 3, wherein the first terminal of each primary unit is connected to the second terminal of a first switching transistor via a first inductor.
5. A resonant converter as claimed in claim 3, characterized in that the first terminal of each secondary unit is connected to the first terminal of a third switching tube via a second inductance.
6. A resonant converter as claimed in claim 2, characterized in that the first rectifying circuit comprises a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), a fifth diode (D5) and a sixth diode (D6);
the anode of the first diode (D1) is connected with the cathode of the second diode (D2), the anode of the third diode (D3) is connected with the cathode of the fourth diode (D4), and the anode of the fifth diode (D5) is connected with the cathode of the sixth diode (D6);
the cathode of the first diode (D1), the cathode of the third diode (D3) and the cathode of the fifth diode (D5) are connected, and the cathode of the fifth diode (D5) is the first end of the first rectifying circuit;
the anode of the second diode (D2), the anode of the fourth diode (D4) and the anode of the sixth diode (D6) are connected, and the anode of the sixth diode (D6) is the second end of the first rectifying circuit.
7. The resonant converter of claim 6, further comprising:
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 resonant 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.
8. A resonant converter according to any one of claims 1-7, characterized in that it further comprises a fifth capacitor (C5), a first terminal of the fifth capacitor (C5) being connected to the first terminal of the first rectifying circuit and a second terminal of the fifth capacitor (C5) being connected to the second terminal of the first rectifying circuit.
9. A resonant converter according to any one of claims 1 to 7 wherein a fuse is provided between the first terminal of the first rectifying circuit and the first terminal of the first switching transistor; and a fuse is arranged between the second end of the first rectifying circuit and the second end of the third switching tube.
10. A resonant converter as claimed in any one of claims 1 to 7 wherein a fuse is provided between the first terminal of the first rectifying circuit and the first terminal of the first switching transistor.
11. A method of controlling a resonant converter according to claim 7, 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 resonant converter by using the main control unit, 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 by using a driving unit 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 resonant converter performs inversion 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 resonant converter performs rectification work.
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US5936855A (en) * 1996-09-03 1999-08-10 Mercury Electric Corporation Harmonic correction of 3-phase rectifiers and converters
JP2002101661A (en) * 2000-09-21 2002-04-05 Origin Electric Co Ltd Power converter
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Inventor after: Yue Weiping

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