CN115378263A - Self-current-sharing method of co-resonant tank multi-phase parallel resonant converter of auxiliary excitation inductor - Google Patents

Self-current-sharing method of co-resonant tank multi-phase parallel resonant converter of auxiliary excitation inductor Download PDF

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CN115378263A
CN115378263A CN202211083927.7A CN202211083927A CN115378263A CN 115378263 A CN115378263 A CN 115378263A CN 202211083927 A CN202211083927 A CN 202211083927A CN 115378263 A CN115378263 A CN 115378263A
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resonant
phase
converter
auxiliary excitation
resonant converter
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孙志峰
王勤
伍群芳
姜盟瀚
李金波
肖岚
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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
    • H02M3/285—Single converters with a plurality of output stages connected in parallel
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • 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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  • Power Engineering (AREA)
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Abstract

The invention discloses a self-current-sharing method of a multi-phase parallel resonant converter of a co-resonant tank of an auxiliary excitation inductor, wherein each phase of sub-module of the multi-phase parallel resonant converter consists of a switch circuit, a resonant inductor, a resonant capacitor, an auxiliary excitation inductor, an isolation transformer and a rectifying circuit; the switching time sequences of the switching circuits of each phase module are the same, so that the working principle and the parameter design of the resonant converter cannot be influenced; the excitation inductor is an independent magnetic element and is not generated by an air gap of the transformer, so that the problem of transformer eddy current loss caused by the air gap is solved, and the operation efficiency of the converter is improved; the method has the advantages of reasonable method, convenient implementation, good universality, small volume, low cost and the like.

Description

Self-current-sharing method of co-resonant tank multi-phase parallel resonant converter of auxiliary excitation inductor
Technical Field
The invention belongs to the technical field of power electronic cascade, and particularly relates to a self-current-sharing method of a co-resonant tank multi-phase parallel resonant converter of an auxiliary excitation inductor.
Background
In recent years, converters in power electronic systems are moving towards high power, integration, low cost, high power density, and high efficiency. The resonant converter has the advantages of electrical isolation, easy realization of soft switching control, high efficiency and the like, can realize a multiple modularization scheme through parallel combination, and is developed into one of core topologies of high-power parallel switching power supplies in the occasions of new energy power generation, electric automobiles, aerospace, uninterruptible power supplies, direct-current power distribution systems and the like.
In low-voltage and high-current occasions, the power capacity of the system can be effectively improved by connecting the multiphase resonant converters in parallel, and the stress of the power tube is reduced, so that the multiphase resonant converter is widely applied. However, in an actual circuit, parameters such as a resonant inductance and a resonant capacitance of each module cannot be guaranteed to be completely consistent, which may cause imbalance of output currents of each module, thereby causing serious problems such as excessive current stress of some modules. In order to solve the above problem, chinese utility model patent: authorization number: CN 212518795U proposes a multiphase parallel resonant converter based on a fully coupled inductor and capable of automatically equalizing currents, however, the addition of the coupled inductor increases the cost and volume of the system, and reduces the power density. The invention has the following patent: publication number: CN 111585442A proposes a multiphase parallel resonant converter capable of automatically equalizing current, which realizes automatic current equalization of multiphase modules by connecting in series a secondary multi-winding transformer of a resonant transformer of each phase resonant converter, but the secondary multi-winding transformer of the method also increases the volume and cost of the system. The invention has the following patent: publication number: CN114825956A proposes a passive current sharing method for a co-resonant tank multi-phase parallel resonant converter based on an auxiliary excitation inductance, however, in this method, the excitation inductance is generated by a transformer air gap, and due to the existence of leakage inductance at the primary side of the transformer, the excitation inductance of the two-phase resonant converter cannot be connected in parallel, so that the excitation inductance has a large influence on the current sharing performance of the system, and in addition, the eddy current loss generated by the transformer air gap magnetic field reduces the operating efficiency of the converter.
The IEEE Transactions on Power Electronics journal, volume 32, no. 9, paper A Passive Current Sharing Method With Common Inductor LLC Converter in 2017, proposes a Common inductance Passive Current Sharing Method, which improves the Current Sharing performance of the system to some extent by connecting the Resonant inductors of two-phase Resonant converters in parallel, but the Current Sharing error of two-phase modules is still large due to the parameter difference of the Resonant capacitors, and the Method has the obvious disadvantages that the Resonant Current and the diode Current of each module of the parallel Resonant Converter are pulled mutually, and the load characteristic is very poor.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a self-current-sharing method of a co-resonant tank multi-phase parallel resonant converter of an auxiliary excitation inductor; the resonant cavities and the auxiliary excitation inductors of the phase modules are connected in parallel at the same time, so that the influence of the parameter difference of the resonant cavities of the phase modules on the current-sharing performance of the system can be eliminated at the same time; the method can be expanded to a parallel resonant converter with a multi-resonant cavity network, and has the advantages of reasonable structure, convenience in implementation, good universality, high system integration level, low cost and the like.
The invention adopts the following technical scheme for solving the technical problems:
the self-current-sharing method of the co-resonant tank multi-phase parallel resonant converter of the auxiliary excitation inductor is suitable for the following devices, and comprises the following steps:
the first phase resonant converter Pl comprises a first switch circuit S1, a first resonant cavity LC1, a first resonant transformer T1, a first auxiliary excitation inductor Lm1 and a first rectification circuit R1, wherein the first auxiliary excitation inductor Lm1 and the first rectification circuit R1 are connected to two ends of a primary winding Np1 of the first resonant transformer T1 in parallel; the first switch circuit S1 is provided with an input port 1-1 and an output port 1-2, the first resonant cavity LC1 is provided with an input port 1-3, and the first rectification circuit R1 is provided with an input port 1-3 and an output port 1-4; the first resonant cavity LC1 is formed by connecting a resonant inductor L1 and a resonant capacitor C1 in series;
the second phase resonance converter P2 comprises a second switching circuit S2, a second resonant cavity LC2, a second resonance transformer T2, a second auxiliary excitation inductor Lm2 and a second rectification circuit R2, wherein the second auxiliary excitation inductor Lm2 and the second rectification circuit R2 are connected to two ends of a primary winding Np2 of the second resonance transformer T2 in parallel; the second switch circuit S2 is provided with an input port 2-1 and an output port 2-2, the second resonant cavity C2 is provided with an input port 2-3, and the second rectification circuit R2 is provided with an input port 2-3 and an output port 2-4; the second resonant cavity LC2 is formed by connecting a resonant inductor L2 and a resonant capacitor C2 in series;
the first resonant cavity LC1 and the second resonant cavity LC2 are connected in parallel through a line l1 and a line l 2; and the first auxiliary excitation inductor Lm1 and the second auxiliary excitation inductor Lm2 are connected in parallel through l2 because the negative end of the two-phase resonant converter is grounded.
Preferably, the series impedances of the first phase resonant converter P1 and the second phase resonant converter P2 are defined as Z1 and Z2, respectively, and the expression is:
Figure BDA0003834670130000021
wherein ω is the angular frequency; l is r1 、L r2 The resonant inductors are respectively a first phase resonant converter and a second phase resonant converter; c r1 、C r2 The resonant capacitors are respectively a first phase resonant converter and a second phase resonant converter; j represents a complex number;
after the resonant cavities of the two-phase modules are connected in parallel through the line l1 and the line l2, the first resonant cavity and the second resonant cavity are coupled, and the total impedance after coupling is as follows:
Figure BDA0003834670130000022
the total impedance equivalent to the impedances of the first phase resonant converter and the second phase resonant converter are Zr1 and Zr2, respectively, and Zr1= Zr2, and the equivalent impedance expression is:
Figure BDA0003834670130000031
after the auxiliary excitation inductors of the two-phase module are connected in parallel through the line l2, the first auxiliary excitation inductor Lm1 and the second auxiliary excitation inductor Lm2 realize coupling, and the coupled auxiliary excitation inductors are equivalent to the auxiliary excitation inductors of the first-phase resonant converter and the second-phase resonant converter:
Figure BDA0003834670130000032
the phase-locked loop comprises a first phase resonant converter, a second phase resonant converter, an Lrm1, an Lrm2, a first phase resonant converter, a second phase resonant converter, a first phase resonant converter and a second phase resonant converter, wherein the Lrm1 and the Lrm2 are equivalent auxiliary excitation inductors of the first phase resonant converter and the second phase resonant converter respectively;
the self-current-sharing method of the co-resonant tank multi-phase parallel resonant converter of the auxiliary excitation inductor is equivalent to the impedance Zr1 and the impedance Zr2 of the first resonant tank of the two-phase resonant converter and equivalent to the impedance Lrm1 and the impedance Lmr2 of the second auxiliary excitation inductor of the two-phase resonant converter, eliminates the problem of current-sharing errors of the two-phase resonant converter caused by parameter differences of resonant elements, and realizes current sharing of the two-phase resonant converter.
Preferably, first auxiliary magnetizing inductance Lm1 and second auxiliary magnetizing inductance Lm2 are independent magnetic elements, which are not generated by an air gap of a transformer; therefore, the first resonant transformer T1 and the second resonant transformer T2 do not need to be provided with air gaps, the problem of transformer eddy current loss caused by the air gaps is solved, and the operation efficiency of the converter is improved.
Preferably, the first switch circuit S 1 And the second switching circuit S 2 The switching time sequences are the same; at the same time, the first phase resonant converter P l And a second phase resonant converter P 2 The converter current direction is the same.
Preferably, the first switch circuit S1 and the second switch circuit S2 can be a half-bridge circuit or a full-bridge circuit; the first rectification circuit R1 and the second rectification circuit R2 can be a half-wave rectification circuit, a full-bridge rectification circuit and a voltage-doubling rectification circuit.
Preferably, the first resonant cavity is a multi-resonant network formed by resonant elements in series and parallel connection; the second resonant cavity is a multi-resonant network formed by resonant elements in series connection and parallel connection; the number of resonant elements in the first resonant cavity and the second resonant cavity is greater than or equal to one.
Compared with the prior art, the invention adopting the technical scheme has the following beneficial effects:
1. the invention provides a passive current sharing method of a co-resonant tank multi-phase parallel resonant converter based on auxiliary excitation inductors, which is characterized in that resonant cavities of two phase modules are connected in parallel on the basis of a traditional multi-phase parallel resonant converter, the auxiliary excitation inductors of the two phase modules are connected in parallel, the impedance equivalent to each module after parallel coupling is the same, and the current sharing error problem caused by parameter difference of resonant elements is eliminated, so that the current sharing of each phase module is automatically realized.
2. The invention provides a passive current sharing method of a co-resonant tank multi-phase parallel resonant converter based on auxiliary excitation inductance, wherein a first auxiliary excitation inductance Lm1 and a second auxiliary excitation inductance Lm2 are independent magnetic elements and are not generated by an air gap of a transformer. Therefore, the first resonant transformer T1 and the second resonant transformer T2 do not need to be provided with air gaps, the problem of transformer eddy current loss caused by the air gaps is solved, and the operation efficiency of the converter is improved.
3. According to the passive current sharing method of the co-resonant tank multi-phase parallel resonant converter based on the auxiliary excitation inductor, provided by the invention, the switching time sequences of the first switching circuit and the second switching circuit are the same, so that the analysis and parameter design of the working principle of the multi-phase parallel resonant converter cannot be influenced.
4. According to the passive current sharing method of the auxiliary excitation inductance-based multi-phase parallel resonant converter of the common resonant tank, provided by the invention, no additional circuit device is introduced, no complex control method is required to be added, and the current sharing effect is good.
5. The passive current sharing method of the co-resonant tank multi-phase parallel resonant converter based on the auxiliary excitation inductor can be expanded to the parallel occasions of the multi-resonant network resonant converter, and the applicability is improved.
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 is a schematic structural diagram of a passive current sharing method of a co-resonant tank multi-phase parallel resonant converter based on an auxiliary excitation inductor, provided by the invention;
fig. 2 is a first embodiment of a passive current sharing method for a co-resonant tank multi-phase parallel resonant converter based on an auxiliary excitation inductor;
FIG. 3 is a conventional multi-phase parallel resonant converter circuit topology;
FIG. 4 shows a resonant current i of a conventional multiphase parallel resonant converter without the method of the present invention Lr1 、i Lr2 Testing waveforms;
FIG. 5 shows the resonant current i when the method of the present invention is used Lr1 、i Lr2 Experimental waveforms;
FIG. 6 shows a conventional multiphase parallel resonant converter rectifier diode i without the method of the present invention D1 、i D2 Experimental waveforms;
FIG. 7 shows a rectifier diode i when the method of the present invention is used D1 、i D2 Testing waveforms;
vin, vo in the figure are input and output voltages i of the multiphase parallel resonant converter Lr1 、i Lr2 Is the resonant inductor current of each phase converter, i D1 、i D2 The current of the rectifier diode of each phase module of the multi-phase parallel resonant converter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1-7, the present invention provides a technical solution:
the invention conception of the invention is as follows: on the basis of a traditional multi-phase parallel resonant converter, resonant cavities of two phase modules are connected in parallel, auxiliary excitation inductors of the two phase modules are connected in parallel, and the impedances equivalent to the modules are the same after parallel coupling, so that the problem of current sharing errors caused by parameter differences of resonant elements is solved, and current sharing of the modules is automatically realized.
Specifically, as shown in fig. 1, the method for self-current sharing of a co-resonant tank multi-phase parallel resonant converter of an auxiliary excitation inductor is characterized by being adapted to the following devices, including:
the first phase resonant converter Pl comprises a first switching circuit S1, a first resonant cavity LC1, a first resonant transformer T1, a first auxiliary excitation inductor Lm1 and a first rectification circuit R1, wherein the first auxiliary excitation inductor Lm1 and the first rectification circuit R1 are connected to two ends of a primary winding Np1 of the first resonant transformer T1 in parallel; the first switching circuit S1 is provided with an input port 1-1 and an output port 1-2, the first resonant cavity LC1 is provided with an input port 1-3, and the first rectifying circuit R1 is provided with an input port 1-3 and an output port 1-4; the first resonant cavity LC1 is formed by connecting a resonant inductor L1 and a resonant capacitor C1 in series;
the second phase resonance converter P2 comprises a second switching circuit S2, a second resonant cavity LC2, a second resonance transformer T2, a second auxiliary excitation inductor Lm2 and a second rectification circuit R2, wherein the second auxiliary excitation inductor Lm2 and the second rectification circuit R2 are connected to two ends of a primary winding Np2 of the second resonance transformer T2 in parallel; the second switching circuit S2 is provided with an input port 2-1 and an output port 2-2, the second resonant cavity C2 is provided with an input port 2-3, and the second rectifying circuit R2 is provided with an input port 2-3 and an output port 2-4; the second resonant cavity LC2 is formed by connecting a resonant inductor L2 and a resonant capacitor C2 in series;
the first resonant cavity is a multi-resonant network formed by resonant elements in series connection and parallel connection; the second resonant cavity is a multi-resonant network formed by resonant elements in series connection and parallel connection; the number of resonant elements in the first resonant cavity and the second resonant cavity is more than or equal to one; the first resonant cavity can be a multi-resonant network consisting of more than three resonant elements in series connection and parallel connection; the second resonant cavity can be a multi-resonant network formed by more than three resonant elements in series and parallel connection;
since the negative terminal of the two-phase resonant converter is grounded, the first auxiliary excitation inductor Lm1 and the second auxiliary excitation inductor Lm2 are connected in parallel through l 2. The first and second auxiliary magnetizing inductances Lm1 and Lm2 are independent magnetic elements, which are not generated by the air gap of the transformer. Therefore, the first resonant transformer T1 and the second resonant transformer T2 do not need to be provided with air gaps, the problem of transformer eddy current loss caused by the air gaps is solved, and the operation efficiency of the converter is improved.
Wherein the first switch circuit S 1 And a second switching circuit S 2 The switching time sequences are the same; at the same time, the first phase resonant converter P l And a second phase resonant converter P 2 The converter current direction is the same.
The first switching circuit S1 and the second switching circuit S2 can be half-bridge circuits, full-bridge circuits; the first rectifier circuit R1 and the second rectifier circuit R2 of (a) can be a half-wave rectifier circuit, a full-bridge rectifier circuit, and a voltage doubler rectifier circuit.
As an embodiment of the present invention, the series impedances of the first phase resonant converter P1 and the second phase resonant converter P2 are defined as Z1 and Z2, respectively, and the expression is:
Figure BDA0003834670130000061
wherein ω is the angular frequency; l is r1 、L r2 The resonant inductors are respectively a first phase resonant converter and a second phase resonant converter; c r1 、C r2 The resonant capacitors are respectively a first phase resonant converter and a second phase resonant converter; j represents a complex number;
after the resonant cavities of the two-phase module are connected in parallel through the line l1 and the line l2, the first resonant cavity and the second resonant cavity are coupled, and the total impedance after coupling is as follows:
Figure BDA0003834670130000062
the total impedance equivalent to the impedances of the first phase resonance converter and the second phase resonance converter are Zr1 and Zr2, respectively, and Zr1= Zr2, and the equivalent impedance expression is:
Figure BDA0003834670130000063
after the auxiliary excitation inductors of the two-phase module are connected in parallel through the line l2, the first auxiliary excitation inductor Lm1 and the second auxiliary excitation inductor Lm2 realize coupling, and the coupled auxiliary excitation inductors are equivalent to the auxiliary excitation inductors of the first-phase resonant converter and the second-phase resonant converter:
Figure BDA0003834670130000064
the two-phase resonant converter comprises a first phase resonant converter, a second phase resonant converter, an Lrm1, an Lrm2 and a power supply, wherein the Lrm1 and the Lrm2 are equivalent auxiliary excitation inductors of the first phase resonant converter and the second phase resonant converter respectively;
the self-current-sharing method of the co-resonant tank multi-phase parallel resonant converter of the auxiliary excitation inductor is equivalent to the condition that the impedance Zr1 of the first resonant tank and the impedance Zr2 of the second resonant tank of the two-phase resonant converter are the same, and is equivalent to the condition that the impedance Lrm1 of the first auxiliary excitation inductor and the impedance Lmr2 of the second auxiliary excitation inductor of the two-phase resonant converter are the same, so that the problem of current-sharing errors of the two-phase resonant converter caused by the parameter difference of resonant elements is solved, and the current sharing of the two-phase resonant converter is realized.
As shown in fig. 4, (fig. 3) the experimental waveforms of the traditional multiphase parallel resonant converters iLr1 and iLr2 are greatly different and very unbalanced, and the resonant current error is 36.4%, while the experimental waveforms of the multiphase parallel resonant converters iLr1 and iLr2 are very small and the current sharing error is 0% when the invention is adopted;
fig. 5 shows a conventional multiphase parallel resonant converter i D1 、i D2 The experimental waveforms have great difference and are very unbalanced, and the voltage-sharing error reaches 90.1 percent, but when the invention is adopted, the multiphase parallel resonant converter i D1 、i D2 The difference of experimental waveforms is very small, and the flow equalizing error is 0.1%;
the experimental parameters were: input voltage Vin =400V, output voltage V o =24V, load 480W; turns ratio n =34, resonance inductance Lr =58 μ H, excitation inductance Lm =0.571mH, resonance capacitance Cr =47nF, switching frequency f s ＝100kHz。
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. The self-current-sharing method of the co-resonant tank multi-phase parallel resonant converter of the auxiliary excitation inductor is characterized by being suitable for the following devices and comprising the following steps:
the first phase resonant converter Pl comprises a first switch circuit S1, a first resonant cavity LC1, a first resonant transformer T1, a first auxiliary excitation inductor Lm1 and a first rectification circuit R1, wherein the first auxiliary excitation inductor Lm1 and the first rectification circuit R1 are connected to two ends of a primary winding Np1 of the first resonant transformer T1 in parallel; the first switch circuit S1 is provided with an input port 1-1 and an output port 1-2, the first resonant cavity LC1 is provided with an input port 1-3, and the first rectification circuit R1 is provided with an input port 1-3 and an output port 1-4; the first resonant cavity LC1 is formed by connecting a resonant inductor L1 and a resonant capacitor C1 in series;
the second phase resonance converter P2 comprises a second switching circuit S2, a second resonant cavity LC2, a second resonance transformer T2, a second auxiliary excitation inductor Lm2 and a second rectification circuit R2, wherein the second auxiliary excitation inductor Lm2 and the second rectification circuit R2 are connected in parallel at two ends of a primary winding Np2 of the second resonance transformer T2; the second switch circuit S2 is provided with an input port 2-1 and an output port 2-2, the second resonant cavity C2 is provided with an input port 2-3, and the second rectification circuit R2 is provided with an input port 2-3 and an output port 2-4; the second resonant cavity LC2 is formed by connecting a resonant inductor L2 and a resonant capacitor C2 in series;
the first resonant cavity LC1 and the second resonant cavity LC2 are connected in parallel through a line l1 and a line l 2; since the negative end of the two-phase resonant converter is grounded, the first auxiliary excitation inductor Lm1 and the second auxiliary excitation inductor Lm2 are connected in parallel through l 2.
2. The self-current-sharing method of the auxiliary excitation inductor co-resonant tank multiphase parallel resonant converter according to claim 1, wherein the series impedances of the first-phase resonant converter P1 and the second-phase resonant converter P2 are respectively defined as Z1 and Z2, and the expression is as follows:
Figure FDA0003834670120000011
wherein ω is the angular frequency; l is r1 、L r2 The resonant inductors are respectively a first phase resonant converter and a second phase resonant converter; c r1 、C r2 The resonant capacitors are respectively a first phase resonant converter and a second phase resonant converter; j represents a plurality;
after the resonant cavities of the two-phase modules are connected in parallel through the line l1 and the line l2, the first resonant cavity and the second resonant cavity are coupled, and the total impedance after coupling is as follows:
Figure FDA0003834670120000012
the total impedance equivalent to the impedances of the first phase resonant converter and the second phase resonant converter are Zr1 and Zr2, respectively, and Zr1= Zr2, and the equivalent impedance expression is:
Figure FDA0003834670120000021
after the auxiliary excitation inductors of the two-phase module are connected in parallel through the line l2, the first auxiliary excitation inductor Lm1 and the second auxiliary excitation inductor Lm2 realize coupling, and the coupled auxiliary excitation inductors are equivalent to the auxiliary excitation inductors of the first-phase resonant converter and the second-phase resonant converter:
Figure FDA0003834670120000022
the two-phase resonant converter comprises a first phase resonant converter, a second phase resonant converter, an Lrm1, an Lrm2 and a power supply, wherein the Lrm1 and the Lrm2 are equivalent auxiliary excitation inductors of the first phase resonant converter and the second phase resonant converter respectively;
the self-current-sharing method of the co-resonant tank multi-phase parallel resonant converter of the auxiliary excitation inductor is equivalent to the condition that the impedance Zr1 of the first resonant tank and the impedance Zr2 of the second resonant tank of the two-phase resonant converter are the same, and is equivalent to the condition that the impedance Lrm1 of the first auxiliary excitation inductor and the impedance Lmr2 of the second auxiliary excitation inductor of the two-phase resonant converter are the same, so that the problem of current-sharing errors of the two-phase resonant converter caused by the parameter difference of resonant elements is solved, and the current sharing of the two-phase resonant converter is realized.
3. The self-current-sharing method of the co-resonant tank multi-phase parallel resonant converter of the auxiliary excitation inductor according to claim 1, characterized in that: the first auxiliary magnetizing inductance Lm1 and the second auxiliary magnetizing inductance Lm2 are independent magnetic elements, which are not generated by an air gap of a transformer; therefore, the first resonant transformer T1 and the second resonant transformer T2 do not need to be provided with air gaps, the problem of transformer eddy current loss caused by the air gaps is solved, and the operation efficiency of the converter is improved.
4. The self-current-sharing method of the co-resonant tank multi-phase parallel resonant converter of the auxiliary excitation inductor according to claim 2, characterized in that: what is needed isThe first switch circuit S 1 And the second switching circuit S 2 The switching time sequences are the same; at the same time, the first phase resonant converter P l And a second phase resonant converter P 2 The converter current direction is the same.
5. The self-current-sharing method of the co-resonant tank multi-phase parallel resonant converter of the auxiliary excitation inductor according to claim 2, characterized in that: the first switch circuit S1 and the second switch circuit S2 can be a half-bridge circuit or a full-bridge circuit; the first rectification circuit R1 and the second rectification circuit R2 can be a half-wave rectification circuit, a full-bridge rectification circuit and a voltage-doubling rectification circuit.
6. The self-current-sharing method for the multi-phase parallel resonant converter with the co-resonant tank and the auxiliary excitation inductor as claimed in claim 2 is characterized in that the first resonant cavity is a multi-resonant network formed by resonant elements in series and parallel connection; the second resonant cavity is a multi-resonant network formed by resonant elements in series connection and parallel connection; the number of resonant elements in the first resonant cavity and the second resonant cavity is greater than or equal to one.
CN202211083927.7A 2022-09-06 2022-09-06 Self-current-sharing method of co-resonant tank multi-phase parallel resonant converter of auxiliary excitation inductor Pending CN115378263A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103683964A (en) * 2013-12-20 2014-03-26 华为技术有限公司 Resonant bidirectional transducer, uninterruptible power supply device and control method
CN114825957A (en) * 2022-04-11 2022-07-29 南京航空航天大学 Passive current sharing method for unified common-inductance common-capacitance multiphase parallel resonant converter
CN114825955A (en) * 2022-04-08 2022-07-29 南京航空航天大学 Integrated type co-resonant unit multiphase parallel resonant converter capable of automatically equalizing current
CN114825956A (en) * 2022-04-08 2022-07-29 南京航空航天大学 Passive current sharing method for co-resonant cavity multiphase parallel resonant converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103683964A (en) * 2013-12-20 2014-03-26 华为技术有限公司 Resonant bidirectional transducer, uninterruptible power supply device and control method
CN114825955A (en) * 2022-04-08 2022-07-29 南京航空航天大学 Integrated type co-resonant unit multiphase parallel resonant converter capable of automatically equalizing current
CN114825956A (en) * 2022-04-08 2022-07-29 南京航空航天大学 Passive current sharing method for co-resonant cavity multiphase parallel resonant converter
CN114825957A (en) * 2022-04-11 2022-07-29 南京航空航天大学 Passive current sharing method for unified common-inductance common-capacitance multiphase parallel resonant converter

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