CN115189587B - Three-phase resonant rectifier and control method thereof - Google Patents
Three-phase resonant rectifier and control method thereof Download PDFInfo
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- CN115189587B CN115189587B CN202211091962.3A CN202211091962A CN115189587B CN 115189587 B CN115189587 B CN 115189587B CN 202211091962 A CN202211091962 A CN 202211091962A CN 115189587 B CN115189587 B CN 115189587B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—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
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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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
- H02M1/0048—Circuits or arrangements for reducing losses
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4258—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 regulated and galvanically isolated DC output voltage
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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
- 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
- H02M3/33573—Full-bridge at primary side of an isolation transformer
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- 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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Abstract
The invention relates to a three-phase resonant rectifier and a control method thereof, wherein the three-phase resonant rectifier comprises a PFC module and an LLC module, and the control method comprises the following steps: the PFC module comprises a three-phase power supply, three first inductors, a switching circuit and a first capacitor; the switching circuit is a three-phase bridge, and each bridge arm comprises a first switching tube and a second switching tube; in the same bridge arm, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube; the drain electrodes of the three first switching tubes are connected with each other, and the source electrodes of the three second switching tubes are connected with each other; the first end of each phase of power supply is respectively connected with the source electrode of the first switching tube of one bridge arm; the second end of each phase of power supply is connected with the drain electrode of the first switching tube through a first inductor; one end of the first capacitor is connected with the drain electrode of the first switch tube, and the other end of the first capacitor is connected with the source electrode of the second switch tube; the LLC module and the PFC module share a switch circuit; the three-phase resonant rectifier uses a small number of devices.
Description
Technical Field
The invention belongs to the technical field of changers, and particularly relates to a three-phase resonant rectifier and a control method thereof.
Background
The traditional three-phase PFC-LLC resonant rectifier adopts a two-stage AC-DC conversion system, which consists of a PFC (Power Factor Correction) module and a DC/DC converter module with isolation, the front-end PFC module is used to improve the Power Factor of the input side, and the DC/DC converter with isolation is used to regulate the voltage of the DC side and the load of the DC side. The traditional three-phase PFC-LLC resonant rectifier is improved in efficiency, but more devices are used, so that the integration and miniaturization development of the resonant rectifier are not facilitated.
Disclosure of Invention
The invention provides a three-phase resonant rectifier and a control method thereof, aiming at the problem that the traditional three-phase PFC-LLC resonant rectifier has more used devices.
According to a first aspect of the present invention, there is provided a three-phase resonant rectifier comprising a PFC module and an LLC module, wherein:
the PFC module comprises a three-phase power supply, three first inductors, a switching circuit and a first capacitor;
the switching circuit is a three-phase bridge and comprises three first switching tubes and three second switching tubes; each bridge arm comprises a first switching tube and a second switching tube; in the same bridge arm, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube; the drain electrodes of the three first switching tubes are connected with each other, and the source electrodes of the three second switching tubes are connected with each other;
the first end of each phase of power supply is respectively connected with the source electrode of the first switching tube of one bridge arm; the second end of each phase of power supply is connected with the drain electrode of the first switching tube through a first inductor;
one end of the first capacitor is connected with the drain electrode of the first switch tube, and the other end of the first capacitor is connected with the source electrode of the second switch tube;
the LLC module and the PFC module share one switch circuit.
Optionally, the value of the inductance is L,
in the formula,Reis an equivalent load connected with the output end of the PFC module,Umis the peak voltage of the three-phase power supply,fsthe switching frequency of the first switching tube;v Cd is the voltage across the first capacitor,ωtthe phase of a three-phase power supply.
Optionally, the switching circuit further comprises a control module, wherein the modulation mode of the control module is pulse frequency modulation, and the control module is used for controlling a first switching tube and a second switching tube of the switching circuit.
Optionally, the LLC module includes a resonant network, a transformer, a rectifying and filtering circuit, and an output resistor;
the input end of the resonant network is connected with the switch circuit, the output end of the resonant network is connected with the input end of the transformer, the output end of the transformer is connected with the input end of the rectification filter circuit, and the output end of the rectification filter circuit is connected with the output resistor.
Optionally, the resonant network includes a resonant inductor, a magnetizing inductor, and a resonant capacitance; the second end of the resonant inductor is connected with the first end of the magnetizing inductor, and the second end of the magnetizing inductor is connected with the first end of the resonant capacitor; the number of the resonant networks is three, the second end of the resonant capacitor of one resonant network is connected with the first end of the resonant inductor of the other resonant network, and the three resonant networks are sequentially connected in series; the first end of the resonant inductor of each resonant network is connected with the source electrode of one first switching tube respectively.
Optionally, the transformer includes a primary winding, a first secondary winding, and a second secondary winding; the primary winding is connected in parallel with the magnetizing inductor, and the second end of the first secondary winding is connected with the first end of the second secondary winding.
Optionally, the rectifying and filtering circuit includes a first diode, a second diode and an output capacitor, the anode of the first diode is connected to the first end of the first secondary winding, the cathode of the first diode is connected to the cathode of the second diode, the anode of the second diode is connected to the second end of the second secondary winding, the first end of the output capacitor is connected to the cathode of the first diode, and the second end of the output capacitor is connected to the second end of the first secondary winding.
According to a second aspect of the present invention, there is provided a control method of a three-phase resonant rectifier, comprising the steps of:
generating a first control signal and a second control signal by using a control module, wherein the duty ratios of the first control signal and the second control signal are respectively 0.5;
and transmitting the first control signal to the grid electrode of the first switching tube, transmitting the second control signal to the grid electrode of the second switching tube, and enabling the three-phase resonant rectifier to have ten working modes in one working period.
Optionally, the operation process of the ten working modes is as follows:
in a first working mode, the first switching tube and the second switching tube are in a closed state, the parasitic capacitance of the second switching tube is charged by the current flowing through the resonant inductor, and the parasitic capacitance of the first switching tube is in a discharge state; the resonance inductor, the magnetizing inductor and the resonance capacitor resonate, and the output capacitor discharges the output resistor;
in a second working mode, the first inductor enters a charging state until the voltage of the first switching tube is reduced to 0;
in a third working mode, the first control signal is at a high level, the first switch tube is kept closed under the clamping action of a body diode of the first switch tube, and the first diode is conducted; the magnetizing inductor absorbs the energy of the primary winding, and the resonant inductor resonates with the resonant capacitor;
in a fourth working mode, the current of the resonant inductor is from 0 to positive, and the first switch tube is opened; the first inductor absorbs the energy of the three-phase power supply, bears the three-phase power supply and the magnetizing inductor and continuously absorbs the energy of the primary winding; the resonant inductor and the resonant capacitor resonate; until the current flowing through the resonant inductor and the magnetizing inductor is the same;
in a fifth working mode, when the currents flowing through the resonant inductor and the magnetizing inductor are the same, the resonant inductor, the magnetizing inductor and the resonant capacitor resonate, and the first diode and the second diode are closed after bearing negative voltage; the output capacitor discharges the output resistor; the first inductor absorbs energy from the three-phase power supply;
in a sixth working mode, the first switching tube and the second switching tube are closed, the first diode and the second diode are closed, the current of the magnetizing inductor is equal to the current of the resonant inductor, and the magnetizing inductor is in resonance with the resonant inductor and the resonant capacitor; the output capacitor discharges the output resistor; the current of the resonant inductor charges the parasitic capacitance of the first switching tube, and the parasitic capacitance of the second switching tube discharges; until the voltage of the parasitic capacitor of the second switching tube is reduced to 0;
in a seventh working mode, the body diode of the second switching tube is conducted, the second control signal is at a high level, and the second switching tube is kept closed under the clamping action of the body diode; the second diode is conducted, and the resonant inductor and the resonant capacitor resonate until the current of the resonant inductor is reduced to 0;
in an eighth working mode, the current of the resonant inductor is reduced from 0 to a negative value, and the second switch tube and the second diode are in a conducting state; the primary winding releases energy to the magnetizing inductor; the resonant inductor and the resonant capacitor resonate, the current of the resonant inductor respectively flows to the magnetizing inductor and the primary winding, and the energy is transmitted to the output resistor through the second secondary winding; until the current of the first inductor is reduced to 0;
in a ninth working mode, the current of the first inductor is 0, and the energy of the magnetizing inductor and the energy of the primary winding are transmitted to the output resistor through the second secondary winding until the current of the magnetizing inductor is the same as the current of the resonant inductor;
in a tenth working mode, the current of the magnetizing inductor is the same as that of the resonant inductor, and the magnetizing inductor is resonant with the resonant inductor and the resonant capacitor; the first diode and the second diode are closed after bearing negative voltage, and the output capacitor discharges the output resistor.
Has the advantages that: in the three-phase resonant rectifier provided by the embodiment, the LLC module and the PFC module share one switching circuit, so that the number of the overall devices of the resonant rectifier is reduced, the cost is effectively reduced, and the integration of the resonant rectifier is facilitated; the number of devices of the resonant rectifier is reduced, so that the overall loss of the resonant rectifier is reduced, and the output efficiency of the resonant rectifier from the input end to the output end is improved.
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 diagram of a prior art three-phase PFC-LLC resonant rectifier.
Fig. 2 shows a schematic structural diagram of a three-phase resonant rectifier provided by the present invention.
Fig. 3 shows one of the schematic operation states of the PFC module of the three-phase resonant rectifier provided in the present invention.
Fig. 4 shows a second schematic diagram of the operating status of the PFC module of the three-phase resonant rectifier according to the present invention.
Fig. 5 is a schematic diagram illustrating a first mode of operation of a three-phase resonant rectifier provided in the present invention.
Fig. 6 is a schematic diagram illustrating a second mode of operation of a three-phase resonant rectifier according to the present invention.
Fig. 7 is a schematic diagram illustrating a third mode of operation of a three-phase resonant rectifier provided in the present invention.
Fig. 8 is a schematic diagram illustrating a fourth mode of operation of a three-phase resonant rectifier provided in the present invention.
Fig. 9 is a schematic diagram illustrating a fifth mode of operation of a three-phase resonant rectifier according to the present invention.
Fig. 10 is a schematic diagram illustrating a sixth mode of operation of a three-phase resonant rectifier provided in the present invention.
Fig. 11 is a schematic diagram illustrating a seventh mode of operation of a three-phase resonant rectifier according to the present invention.
Fig. 12 is a schematic diagram illustrating an eighth mode of operation of a three-phase resonant rectifier provided in the present invention.
Fig. 13 is a schematic diagram illustrating a ninth mode of operation of a three-phase resonant rectifier according to the present invention.
Fig. 14 is a schematic diagram illustrating a tenth mode of operation of a three-phase resonant rectifier provided in the present invention.
Reference numerals are as follows:
l1a and a first inductor I; l1b and a first inductor II; l1c and a first inductor III;
va, A phase power supply; vb, B phase power supplies; vc, C phase power;
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;
lra, a resonant inductor I; lrb and a resonant inductor II; lrc, resonant inductor iii;
lma, a magnetizing inductor I; lmb and a magnetizing inductor II; lmc, magnetizing inductor III;
cra and a resonant capacitor I; crb and a resonant capacitor II; a Crc resonant capacitor III;
ta and a transformer I; tb and a transformer II; tc, transformer III;
d1a, a first diode I; d1b, a first diode II; d1c, a first diode III;
d2a and a second diode I; d2b and a second diode II; d2c and a second diode III;
cd. A first capacitor; co, output capacitance;
ro, output resistance; re, resistive load.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations 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. 2, a three-phase resonant rectifier according to an embodiment of the disclosure includes a PFC module and an LLC module.
Specifically, the PFC module comprises a three-phase power supply, a first inductor, a switching circuit and a first capacitor Cd; the three-phase power supply comprises an A-phase power supply Va, a B-phase power supply Vb and a C-phase power supply Vc; the first inductor comprises a first inductor IL 1a, a first inductor IIL 1b and a first inductor IIIL 1c; the switching circuit is a three-phase bridge, each bridge arm comprises a first switching tube and a second switching tube, the first bridge arm comprises a first switching tube I S1a and a second switching tube I S2a, the second bridge arm comprises a first switching tube II S1b and a second switching tube II S2b, and the third bridge arm comprises a first switching tube III S1c and a second switching tube III S2c.
In the present embodiment, the first switching tubes S1a, S1b, S1c and the second switching tubes S2a, S2b, S2c all belong to MOSFET switching tubes. The second end of the first inductor IL 1a is connected with the first end of an A-phase power supply Va, and the second end of the A-phase power supply Va is connected with the source electrode of the first switch tube IS 1a and the drain electrode of the second switch tube IS 2a; the second end of the first inductor IIL 1B is connected with the first end of a B-phase power supply Vb, and the second end of the B-phase power supply Vb is connected with the source electrode of the first switching tube IIS 1B and the drain electrode of the second switching tube IIS 2B; the second end of the first inductor III L1C is connected with the first end of a C-phase power supply Vc, and the second end of the C-phase power supply Vc is connected with the source electrode of a first switching tube IIIS 1C and the drain electrode of a second switching tube IIIS 2C; the first end of a first inductor IL 1a, the first end of a first inductor IIL 1b, the first end of a first inductor III L1c, the drain electrode of a first switching tube IS 1a and the drain electrode of a first switching tube IIIS 1c of the drain electrode of a first switching tube IIS 1b are mutually connected; the source electrode of the second switch tube IIS 2a, the source electrode of the second switch tube IIS 2b and the source electrode of the second switch tube IIIS 2c are connected with each other; the first capacitor Cd is connected in parallel with two ends of the three-phase bridge, namely a first end of the first capacitor Cd is connected with a drain electrode of the first switch tube IIIS 1c, and a second end of the first capacitor Cd is connected with a source electrode of the second switch tube IIIS 2c.
Specifically, the control module is respectively connected with a grid electrode of a first switch tube IS 1a, a grid electrode of a second switch tube IS 2a, a grid electrode of a first switch tube IIS 1b, a grid electrode of a second switch tube IIS 2b, a grid electrode of a first switch tube IIIS 1c and a grid electrode of a second switch tube IIIS 2c, and controls the on-off of the first switch tube IS 1a, the second switch tube IS 2a, the first switch tube IIS 1b, the second switch tube IIS 2b, the first switch tube IIIS 1c and the second switch tube IIIS 2c; the Modulation mode of the control module is Pulse Frequency Modulation (PFM), which realizes a wide output range, and can be applied to step-change and stable output voltage.
Specifically, the LLC module includes a resonant network, a transformer, a rectifier filter circuit, and an output resistor Ro; the input end of the resonant network is connected with the switch circuit, the output end of the resonant network is connected with the input end of the transformer, the output end of the transformer is connected with the input end of the rectification filter circuit, and the output end of the rectification filter circuit is connected with the output resistor Ro. In this embodiment, the LLC module is controlled by a switch circuit, i.e., the LLC module and the PFC module share a switch circuit.
The resonant network comprises a resonant network I, a resonant network II and a resonant network III which are the same in structure.
The resonant network I comprises a resonant inductor I Lra, a magnetizing inductor I Lma and a resonant capacitor I Cra; the first end of resonance inductor I Lra is connected with the source electrode of first switch tube I S1a, and the second end of resonance inductor I Lra is connected with the first end of magnetization inductor I Lma, and the second end of magnetization inductor I Lma is connected with the first end of resonance capacitor I Cra, and the second end of resonance capacitor I Cra is connected with resonance network II.
The resonance network II comprises a resonance inductor II Lrb, a magnetizing inductor II Lmb and a resonance capacitor II Crb; the first end of the resonant inductor II Lrb is connected with the source electrode of the first switching tube II S1b and the second end of the resonant capacitor I Cra, the second end of the resonant inductor II Lrb is connected with the first end of the magnetizing inductor II Lmb, the second end of the magnetizing inductor II Lmb is connected with the first end of the resonant capacitor II Crb, and the second end of the resonant capacitor II Crb is connected with the resonant network III.
The resonant network III comprises a resonant inductor III Lrc, a magnetizing inductor III Lmc and a resonant capacitor III Crc; the first end of resonant inductor III Lrc is connected with the source of first switch tube III S1c, the second end of resonant capacitor II Crb, and the second end of resonant inductor III Lrc is connected with the first end of magnetization inductor III Lmc, and the second end of magnetization inductor III Lmc is connected with the first end of resonant capacitor III Crc, and the second end of resonant capacitor III Crc is connected with resonant inductor I Lra.
The transformer comprises three transformers I Ta, II Tb and III Tc which have the same structure; the rectification filter circuit comprises a rectification circuit I, a rectification circuit II, a rectification circuit III and an output capacitor Co which are the same in structure.
The transformer I Ta comprises a primary winding I, a first secondary winding I and a second secondary winding I; the primary winding I is connected in parallel with two ends of a magnetizing inductor I Lma, and the second end of the first secondary winding I is connected with the first end of the second secondary winding I; the first end of the primary winding I, the first end of the first secondary winding I and the first end of the second secondary winding I are homonymous ends, and the rectifying circuit I comprises a first diode ID 1a and a second diode ID 2a; the positive pole of first diode ID 1a is connected with the first end of first secondary winding I, and the positive pole of second diode is connected with the second end of second secondary winding, and the negative pole of first diode ID 1a is connected with the negative pole of second diode ID 2 a.
The transformer IITb comprises a primary winding II, a first secondary winding II and a second secondary winding II; the primary winding II is connected in parallel with two ends of the magnetizing inductor II Lmb, and the second end of the first secondary winding II is connected with the first end of the second secondary winding II; the first end of the primary winding II, the first end of the first secondary winding II and the first end of the second secondary winding II are homonymous ends, and the rectifying circuit II comprises a first diode II D1b and a second diode II D2b; the positive electrode of the first diode IID 1b is connected with the first end of the first secondary winding II, the positive electrode of the second diode is connected with the second end of the second secondary winding, and the negative electrode of the first diode IID 1b is connected with the negative electrode of the second diode IID 2 b.
The transformer IIITc comprises a primary winding III, a first secondary winding III and a second secondary winding III; the primary winding III is connected in parallel with two ends of a magnetizing inductor III Lmc, and the second end of the first secondary winding III is connected with the first end of the second secondary winding III; the first end of the primary winding III, the first end of the first secondary winding III and the first end of the second secondary winding III are homonymous ends, and the rectifying circuit III comprises a first diode III D1c and a second diode III D2c; the positive pole of the first diode III D1c is connected with the first end of the first secondary winding III, the positive pole of the second diode is connected with the second end of the second secondary winding, and the negative pole of the first diode III D1c is connected with the negative pole of the second diode III D2 c.
The second end of the first secondary winding I, the second end of the first secondary winding II and the second end of the first secondary winding III are connected; the negative electrode of the first diode ID 1a, the negative electrode of the first diode II D1b and the negative electrode of the first diode III D1c are connected; a first end of the output capacitor Co is connected with a first end of the first diode ID 1a, and a second end of the output capacitor Co is connected with a second end of the first diode ID 1 a; the output resistor Ro is connected in parallel to two ends of the output capacitor Co.
In this embodiment, a single phase is taken as an example, and the condition for realizing the PFC function of the PFC module is analyzed.
For a successful implementation of the PFC function, the current of the first inductor needs to increase from zero to a peak value and then decrease from the peak value to 0 within one duty cycle; in this converter, the LLC module corresponds to a load connected to the PFC module, and therefore, to simplify the analysis, the LLC module is simplified to a resistive load Re.
Taking the positive half cycle as an example, when the first switch tube is turned on and the second switch tube is turned off, the operation state of the PFC module is as shown in fig. 3, where the relationship between the current of the first inductor il 1a and the input voltage can be represented as:
wherein,v a is the voltage of the a-phase power supply Va,v L is the voltage of the first inductor IL 1a, L is the inductance of the first inductor IL 1a,i L is the current of the first inductor IL 1a, t is the operating time of the first inductor IL 1a, i LP Is the peak current of the first inductor il 1a,T S for the duration of a working cycle of the first switching transistor is ls 1a,v Cd is the voltage of the first capacitor Cd,R e the equivalent resistance value of the resistance load Re of the PFC module;C d which is the capacitance of the first capacitor Cd.
Thus, the peak value of the first inductance il 1a is:
wherein,d 1 the duty ratio is the duty ratio of the current of the first inductor IL 1a increasing from 0 to the peak value in one working period;fsthe switching frequencies of the first switching tube IS 1a and the second switching tube IS 2a are the same as the switching frequencies of the switching tubes S1a and S2 a;
when the first switch tube is turned off and the second switch tube is turned on, the operation state of the PFC module is as shown in fig. 4, where the relationship between the current and the output voltage of the first inductor il 1a can be expressed as:
wherein,
is the first in a working cycleThe current of inductor il 1a decreases from a peak value to a duty cycle of 0,
is composed ofR e The voltage across the terminals, i.e., the output voltage of the PFC module. Therefore, the magnitude of the drop in the current of the first inductor il 1a is:
obtained according to the formulas (3) to (6),
wherein,
；Umis the peak voltage of the phase A power supply Va, the phase of the phase A power supply Va;
according to the above formula, if PFC is to be realized, it is necessary to have
In other words,
the pair formula (9) is simplified to obtain
Equation (10) shows that, for the implementation of the PFC function,v Cd must be at least the input voltagev a Twice as much, i.e.
Since the slope of the current of the first inductor il 1a is proportional to the voltage of the first inductor il 1a, when the current of the first inductor il 1a rises, the slopeK 1 Is marked as
When the current of the first inductor IL 1a decreases, the slopeK 2 Is marked as
Since d1 is a fixed value of 0.5, for the implementation of the PFC function, it should be ensured
。
Therefore, in order to ensure the normal operation of the PFC module, adjustment should be madev Cd To reduce the current in the first inductor il 1a, i.e. the energy stored in the first inductor il 1a is transferred to the first capacitor Cd. Average input power of switching period of each switching tube S1a, S2a in positive half periodP in Comprises the following steps:
wherein,
，Tsubstituting the formula (3) and the formula (7) into the formula (14) for the duration of one cycle of the A-phase power supply Va to obtain
Due to the fact that
And is andT S relative toTSufficiently small that the formula (16) can be expressed as
Since the first capacitor Cd supplies power to the resistive load Re only when the first switching tube IS 1a is on and the second switching tube IS 2a is off, the power is outputP out Can be expressed as
Assuming an energy transfer efficiency of 1, i.e.
Can obtain
Simplified formula (18) to
As can be seen from equation (19), when loadedR e Sum frequencyf s When constant, the value of the first inductor il 1a should be:
similarly, the value ranges of the first inductance il 1b and the first inductance iii L1c can be obtained, and in this embodiment, the values of the first inductance il 1a, the first inductance il 1b, and the first inductance iii L1c are the same.
The PFC module belongs to a bridgeless boost converter, has a simple structure, can obtain a high power factor, and can complete AC-DC energy conversion.
In the three-phase resonant rectifier provided by this embodiment, the switching circuit in the PFC module is shared with the LLC module, the switching circuit realizes the rectification function in the LLC module, and simultaneously controls the LLC module, and the duty ratios of the first switching tubes S1a, S1b, and S1c and the second switching tubes S2a, S2b, and S2c are respectively 0.5.
Taking a single phase as an example, in one working period, the single-mode operation of the three-phase resonant rectifier includes ten working modes, which are as follows:
referring to fig. 5, in a first operating mode, a first switching tube is in an off state, a current flowing through a resonant inductor is charges a parasitic capacitance of a second switching tube is in an off state, and a parasitic capacitance of the first switching tube is in a discharging state; the resonant inductor I Lra, the magnetizing inductor I Lma and the resonant capacitor I Cra resonate, and the output capacitor Co discharges the output resistor Ro.
Referring to fig. 6, in the second operating mode, the first inductor il 1a enters a charging state until the voltage of the first switching tube is decreased to 0.
Referring to fig. 7, in the third mode of operation, the body diode of the first switch transistor is turned on, the first switch transistor is turned on in the zero voltage state, at this time, the first control signal is at a high level, the first switch transistor is turned off under the clamping action of the body diode, and the first diode id 1a is turned on; the primary voltage of a primary winding I of the transformer is clamped to nUo, the Uo is output voltage, and n is the voltage ratio of a transformer ITA; the magnetizing inductor I Lma absorbs the energy of the primary winding I, and the resonant inductor I Lra and the resonant capacitor I Cra resonate.
Referring to fig. 8, in a fourth operation mode, the current of the resonant inductor i Lra goes from 0 to positive, and the first switch tube is turned on i S1 a; the first inductor IL 1a absorbs the energy of the A-phase power supply Va and bears the energy of the A-phase power supply Va and the magnetizing inductor ILma to continuously absorb the energy of the primary winding I; the resonant inductor I Lra resonates with the resonant capacitor I Cra; until the currents flowing through the resonant inductor ilra and the magnetizing inductor illma are the same.
Referring to fig. 9, in a fifth mode of operation, when the currents flowing through the resonant inductor i Lra and the magnetizing inductor i Lma are the same, the resonant inductor i Lra, the magnetizing inductor i Lma, and the resonant capacitor i Cra resonate, and the first diode id 1a and the second diode id 2a are turned off after receiving a negative voltage; the output capacitor Co discharges the output resistor Ro; the first inductor il 1a absorbs energy from the a-phase power supply Va.
Referring to fig. 10, in a sixth mode of operation, the first switch i 1a and the second switch i 2a are turned off, the first diode i 1a and the second diode i 2a are turned off, the current of the magnetizing inductor i Lma is equal to the current of the resonant inductor i Lra, and the magnetizing inductor i Lma resonates with the resonant inductor i Lra and the resonant capacitor i Cra; the output capacitor Co discharges the output resistor Ro; the current of the resonant inductor I Lra charges the parasitic capacitance of the first switch tube I S1a, and the parasitic capacitance of the second switch tube I S2a discharges; until the voltage of the parasitic capacitor of the second switch tube is reduced to 0, the body diode of the second switch tube is conducted.
Referring to fig. 11, in a seventh operation mode, the body diode of the second switching tube is turned on, the second switching tube is turned on at zero voltage, the second control signal driving the second switching tube is at a high level, and the second switching tube is kept turned off under the clamping action of the body diode of the second switching tube is turned on at zero voltage; meanwhile, the second diode Id 2a is conducted, and the resonant inductor I Lra and the resonant capacitor I Cra resonate until the current of the resonant inductor I Lra is reduced to 0.
Referring to fig. 12, in the eighth operating mode, the current of the resonant inductor ila decreases from 0 to a negative value, the second switching tube is in a conducting state with the second diode id 2a and the second switching tube is in a conducting state, the primary voltage of the transformer ita is clamped to-nUo, uo is the output voltage, and n is the voltage ratio of the transformer ita; the primary winding I releases energy to the magnetizing inductor I Lma; the resonant inductor I Lra and the resonant capacitor I Cra resonate, the current of the resonant inductor I Lra flows to the magnetizing inductor I Lma and the primary winding I respectively, and the energy is transmitted to the output resistor Ro through the secondary winding I; until the current of the first inductor il 1a drops to 0.
Referring to fig. 13, in the ninth operating mode, the current of the first inductor il 1a is 0, and the energy of the magnetizing inductor il ma and the energy of the primary winding i are transmitted to the output resistor Ro through the second secondary winding i until the current of the magnetizing inductor il ma is the same as the current of the resonant inductor i Lra.
Referring to fig. 14, in the tenth mode of operation, the current of the magnetizing inductor Lma is the same as the current of the resonant inductor ilra, and the magnetizing inductor Lma resonates with the resonant inductor ilra and the resonant capacitor icra; the first diode ID 1a and the second diode ID 2a are closed after bearing negative voltage, and the output capacitor Co discharges the output resistor Ro.
Referring to fig. 1, compared with the conventional three-phase PFC-LLC resonant rectifier, the three-phase resonant rectifier provided in this embodiment has higher integration, which reduces the use of seven diodes, one inductor, one MOSFET switch tube, and one capacitor, reduces the number of the overall devices of the resonant rectifier, reduces the cost, and is beneficial to the integration of the resonant rectifier; the number of devices of the resonant rectifier is reduced, so that the overall loss of the resonant rectifier is reduced, and the output efficiency of the resonant rectifier from the input end to the output end is improved; meanwhile, the three-phase resonant rectifier provided by the embodiment has a wide output range.
Example 2
The control method of the three-phase resonant rectifier provided by the embodiment of the invention comprises the following steps:
generating a first control signal and a second control signal by using a control module, wherein the duty ratios of the first control signal and the second control signal are respectively 0.5;
and transmitting the first control signal to the grid electrode of the first switching tube, transmitting the second control signal to the grid electrode of the second switching tube, and enabling the three-phase resonant rectifier to have ten working modes in one working period.
Taking a single phase as an example, in one working period, the single-mode operation of the three-phase resonant rectifier includes ten working modes, which are as follows:
referring to fig. 5, in a first operation mode, the first switch tube is in an off state, the current flowing through the resonant inductor is charges the parasitic capacitance of the second switch tube is in an off state, and the parasitic capacitance of the first switch tube is in a discharging state; the resonant inductor I Lra, the magnetizing inductor I Lma and the resonant capacitor I Cra resonate, and the output capacitor Co discharges the output resistor Ro.
Referring to fig. 6, in the second operating mode, the first inductor il 1a enters a charging state until the voltage of the first switching tube is decreased to 0.
Referring to fig. 7, in the third mode of operation, the body diode of the first switch transistor is turned on, the first switch transistor is turned on in the zero voltage state, at this time, the first control signal is at a high level, the first switch transistor is turned off under the clamping action of the body diode, and the first diode id 1a is turned on; the primary voltage of a primary winding I of the transformer is clamped to nUO, the UO is an output voltage, and n is a voltage ratio of a transformer ITA; the magnetizing inductor I Lma absorbs the energy of the primary winding I, and the resonant inductor I Lra and the resonant capacitor I Cra resonate.
Referring to fig. 8, in a fourth operation mode, the current of the resonant inductor i Lra goes from 0 to positive, and the first switch tube is turned on i S1 a; the first inductor IL 1a absorbs the energy of the A-phase power supply Va and bears the energy of the A-phase power supply Va and the magnetizing inductor ILma to continuously absorb the energy of the primary winding I; the resonant inductor I Lra resonates with the resonant capacitor I Cra; until the currents flowing through the resonant inductor ilra and the magnetizing inductor illma are the same.
Referring to fig. 9, in a fifth operation mode, when the currents flowing through the resonant inductor i Lra and the magnetizing inductor i Lma are the same, the resonant inductor i Lra, the magnetizing inductor i Lma and the resonant capacitor i Cra resonate, and the first diode id 1a and the second diode id 2a receive a negative voltage and then turn off; the output capacitor Co discharges the output resistor Ro; the first inductor il 1a absorbs energy from the a-phase power supply Va.
Referring to fig. 10, in a sixth mode of operation, the first switch i 1a and the second switch i 2a are turned off, the first diode i 1a and the second diode i 2a are turned off, the current of the magnetizing inductor i Lma is equal to the current of the resonant inductor i Lra, and the magnetizing inductor i Lma resonates with the resonant inductor i Lra and the resonant capacitor i Cra; the output capacitor Co discharges the output resistor Ro; the current of the resonant inductor I Lra charges the parasitic capacitance of the first switch tube I S1a, and the parasitic capacitance of the second switch tube I S2a discharges; until the voltage of the parasitic capacitor of the second switch tube is reduced to 0, the body diode of the second switch tube is conducted.
Referring to fig. 11, in a seventh operation mode, the body diode of the second switching tube is turned on, the second switching tube is turned on at zero voltage, the second control signal driving the second switching tube is at a high level, and the second switching tube is kept turned off under the clamping action of the body diode of the second switching tube is turned on at zero voltage; meanwhile, the second diode Id 2a is conducted, and the resonant inductor I Lra and the resonant capacitor I Cra resonate until the current of the resonant inductor I Lra is reduced to 0.
Referring to fig. 12, in the eighth operation mode, the current of the resonant inductor ila is reduced from 0 to a negative value, the second switching tube is in a conducting state with the second diode id 2a, the primary voltage of the transformer ita is clamped to-nUo, uo is the output voltage, and n is the voltage ratio of the transformer ita; the primary winding I releases energy to the magnetizing inductor I Lma; the resonant inductor I Lra and the resonant capacitor I Cra resonate, the current of the resonant inductor I Lra flows to the magnetizing inductor I Lma and the primary winding I respectively, and the energy is transmitted to the output resistor Ro through the secondary winding I; until the current of the first inductor il 1a drops to 0.
Referring to fig. 13, in the ninth operating mode, the current of the first inductor il 1a is 0, and the energy of the magnetizing inductor il ma and the energy of the primary winding i are transmitted to the output resistor Ro through the second secondary winding i until the current of the magnetizing inductor il ma is the same as the current of the resonant inductor i Lra.
Referring to fig. 14, in the tenth operating mode, the current of the magnetizing inductor i Lma is the same as that of the resonant inductor i Lra, and the magnetizing inductor i Lma resonates with the resonant inductor i Lra and the resonant capacitor i Cra; the first diode id 1a and the second diode id 2a are turned off after receiving a negative voltage, and the output capacitor Co discharges the output resistor Ro.
The control method enables the three-phase resonant rectifier to simultaneously realize the PFC function and the LLC function, and enables the three-phase resonant rectifier to realize wide-range output.
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 the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, 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 of 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 by the method for 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 when the program is executed, the program 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 separate 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 herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, 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 (2)
1. A three-phase resonant rectifier, comprising a PFC module and an LLC module, wherein:
the PFC module comprises a three-phase power supply, three first inductors, a switching circuit and a first capacitor (Cd);
the switching circuit is a three-phase bridge and comprises three first switching tubes and three second switching tubes; each bridge arm comprises a first switch tube and a second switch tube; in the same bridge arm, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube; the drain electrodes of the three first switching tubes are connected with each other, and the source electrodes of the three second switching tubes are connected with each other;
the first end of each phase of power supply is respectively connected with the source electrode of the first switching tube of one bridge arm; the second end of each phase of power supply is connected with the drain electrode of the first switching tube through a first inductor;
one end of the first capacitor (Cd) is connected with the drain electrode of the first switch tube, and the other end of the first capacitor (Cd) is connected with the source electrode of the second switch tube;
the LLC module and the PFC module share a switch circuit;
the modulation mode of the control module is pulse frequency modulation and is used for controlling a first switching tube and a second switching tube of the switching circuit; the control module generates a first control signal and a second control signal, and the duty ratios of the first control signal and the second control signal are respectively 0.5; the value of the inductance is L,
in the formula,Reis an equivalent load connected with the output end of the PFC module,Umis the peak voltage of the three-phase power supply,fsthe switching frequency of the first switching tube;v Cd is the voltage across the first capacitor (Cd),ωtis the phase of the three-phase power supply;
the LLC module comprises a resonant network, a transformer, a rectification filter circuit and an output resistor (Ro);
the input end of the resonant network is connected with the switch circuit, the output end of the resonant network is connected with the input end of the transformer, the output end of the transformer is connected with the input end of the rectifying and filtering circuit, and the output end of the rectifying and filtering circuit is connected with the output resistor (Ro);
the resonant network comprises a resonant inductor, a magnetizing inductor and a resonant capacitance; the second end of the resonant inductor is connected with the first end of the magnetizing inductor, and the second end of the magnetizing inductor is connected with the first end of the resonant capacitor; the number of the resonant networks is three, the second end of the resonant capacitor of one resonant network is connected with the first end of the resonant inductor of the other resonant network, and the three resonant networks are sequentially connected in series; the first end of the resonant inductor of each resonant network is connected with the source electrode of a first switching tube respectively;
the transformer comprises a primary winding, a first secondary winding and a second secondary winding; the primary winding is connected with the magnetizing inductor in parallel, and the second end of the first secondary winding is connected with the first end of the second secondary winding;
the rectifying and filtering circuit comprises a first diode, a second diode and an output capacitor (Co), wherein the anode of the first diode is connected with the first end of the first secondary winding, the cathode of the first diode is connected with the cathode of the second diode, the anode of the second diode is connected with the second end of the second secondary winding, the first end of the output capacitor (Co) is connected with the cathode of the first diode, and the second end of the output capacitor (Co) is connected with the second end of the first secondary winding.
2. A method of controlling a three-phase resonant rectifier as set forth in claim 1, including the steps of:
generating a first control signal and a second control signal by using a control module, wherein the duty ratios of the first control signal and the second control signal are respectively 0.5;
transmitting a first control signal to a grid electrode of a first switching tube, transmitting a second control signal to a grid electrode of a second switching tube, and enabling the three-phase resonant rectifier to have ten working modes in one working period;
the operation process of the ten working modes is as follows:
in a first working mode, the first switching tube and the second switching tube are in a closed state, the parasitic capacitance of the second switching tube is charged by the current flowing through the resonant inductor, and the parasitic capacitance of the first switching tube is in a discharge state; the resonance inductor, the magnetizing inductor and the resonance capacitor are resonated, and the output capacitor (Co) discharges the output resistor (Ro);
in a second working mode, the first inductor enters a charging state until the voltage of the first switching tube is reduced to 0;
in a third working mode, the first control signal is at a high level, the first switch tube is kept closed under the clamping action of a body diode of the first switch tube, and the first diode is conducted; the magnetizing inductor absorbs the energy of the primary winding, and the resonant inductor resonates with the resonant capacitor;
in a fourth working mode, the current of the resonant inductor is from 0 to positive, and the first switching tube is opened; the first inductor absorbs the energy of the three-phase power supply and bears the three-phase power supply and the magnetizing inductor to continuously absorb the energy of the primary winding; the resonant inductor and the resonant capacitor are resonant; until the currents flowing through the resonant inductor and the magnetizing inductor are the same;
in a fifth working mode, when the currents flowing through the resonant inductor and the magnetizing inductor are the same, the resonant inductor, the magnetizing inductor and the resonant capacitor resonate, and the first diode and the second diode are closed after bearing negative voltage; the output capacitor (Co) discharges the output resistor (Ro); the first inductor absorbs energy from the three-phase power supply;
in a sixth working mode, the first switching tube and the second switching tube are closed, the first diode and the second diode are closed, the current of the magnetizing inductor is equal to the current of the resonant inductor, and the magnetizing inductor is in resonance with the resonant inductor and the resonant capacitor; the output capacitor (Co) discharges the output resistor (Ro); the current of the resonant inductor charges the parasitic capacitance of the first switching tube, and the parasitic capacitance of the second switching tube discharges; until the voltage of the parasitic capacitor of the second switching tube is reduced to 0;
in a seventh working mode, the body diode of the second switching tube is conducted, the second control signal is at a high level, and the second switching tube is kept closed under the clamping action of the body diode; the second diode is conducted, and the resonant inductor and the resonant capacitor resonate until the current of the resonant inductor is reduced to 0;
in an eighth working mode, the current of the resonant inductor is reduced from 0 to a negative value, and the second switch tube and the second diode are in a conducting state; the primary winding releases energy to the magnetizing inductor; the resonance inductor and the resonance capacitor resonate, the current of the resonance inductor respectively flows to the magnetization inductor and the primary winding, and the energy is transmitted to the output resistor (Ro) through the second secondary winding; until the current of the first inductor is reduced to 0;
in a ninth working mode, the current of the first inductor is 0, and the energy of the magnetizing inductor and the energy of the primary winding are transmitted to the output resistor (Ro) through the second secondary winding until the current of the magnetizing inductor is the same as the current of the resonant inductor;
in a tenth working mode, the current of the magnetizing inductor is the same as that of the resonant inductor, and the magnetizing inductor is resonant with the resonant inductor and the resonant capacitor; the first diode and the second diode are closed after bearing negative voltage, and the output capacitor (Co) discharges the output resistor (Ro).
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