CN116345917A - LLC converter circuit - Google Patents

LLC converter circuit Download PDF

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Publication number
CN116345917A
CN116345917A CN202310367538.5A CN202310367538A CN116345917A CN 116345917 A CN116345917 A CN 116345917A CN 202310367538 A CN202310367538 A CN 202310367538A CN 116345917 A CN116345917 A CN 116345917A
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China
Prior art keywords
primary
primary transformer
transformer
winding
inductance
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Pending
Application number
CN202310367538.5A
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Chinese (zh)
Inventor
刘钧
冯颖盈
张昌盛
唐锋
滕森
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Shenzhen Vmax Power Co Ltd
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Shenzhen Vmax Power Co Ltd
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Priority to CN202310367538.5A priority Critical patent/CN116345917A/en
Publication of CN116345917A publication Critical patent/CN116345917A/en
Pending legal-status Critical Current

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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
    • H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • 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
    • H02M1/0054—Transistor switching losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses an LLC converter circuit which comprises a full-bridge circuit connected with a bus capacitor, a rectifying circuit connected with a filter capacitor and a load, an integrated transformer connected with the full-bridge circuit and the rectifying circuit in a magnetic coupling mode, and a resonator connected between the full-bridge circuit and the integrated transformer, wherein the integrated transformer is formed in a magnetic integration mode through a first primary transformer T1 and a second primary transformer T2, a primary winding of the first primary transformer T1 is connected in series with a primary winding of the second primary transformer T2, and a secondary winding of the first primary transformer T1 is connected in parallel with a secondary winding of the second primary transformer T2 so as to improve the power grade of the LLC converter circuit. Compared with the prior art, the invention adopts the mode that the primary sides of the transformers are connected in series and the secondary sides of the transformers are connected in parallel to improve the power grade, and simultaneously carries out magnetic integration treatment on the transformers, thereby effectively reducing the volume and the quality of the invention.

Description

LLC converter circuit
Technical Field
The invention relates to the technical field of electric automobile charging, in particular to an LLC converter circuit.
Background
The proportion of the new energy automobiles is higher and higher, and along with the increase of the number of the electric automobiles and the continuous improvement of the quality requirements, the charging equipment of the electric automobiles is also continuously updated, the electric automobiles are smoothly developed and popularized, and the charging device is an important link.
For manufacturers of charging equipment, how to realize the battery charger with the same power level through other different solutions under the condition of global core-missing short core so as to prevent the impact caused by core missing is a current urgent problem to be solved.
Disclosure of Invention
Aiming at the problem of core-missing short core in the prior art, the invention provides an LLC converter circuit.
The technical scheme of the invention is that the LLC converter circuit comprises a full-bridge circuit connected with a bus capacitor, a rectifying circuit connected with a filter capacitor and a load, an integrated transformer connected with the full-bridge circuit and the rectifying circuit in a magnetic coupling mode, and a resonator connected between the full-bridge circuit and the integrated transformer, wherein the integrated transformer is formed in a magnetic integration mode through a first primary transformer T1 and a second primary transformer T2, a primary winding of the first primary transformer T1 is connected in series with a primary winding of the second primary transformer T2, and a secondary winding of the first primary transformer T1 is connected in parallel with a secondary winding of the second primary transformer T2 so as to improve the power grade of the LLC converter circuit.
Further, the full-bridge circuit comprises a first bridge arm and a second bridge arm, the rectifying circuit comprises a third bridge arm and a fourth bridge arm, and the resonator comprises an inductance L R1 Inductance L R2 Inductance L m1 Inductance L m2 Capacitance C R ；
The same-name end of the primary winding of the first primary transformer T1 is connected in series with the inductor L R1 And then connected to the midpoint of the first bridge arm, the synonym end of the primary winding of the first primary transformer T1 is connected to the synonym end of the primary winding of the second primary transformer T2, and the synonym end of the primary winding of the second primary transformer T2 depends onThe inductance L is connected in series R2 And the capacitor C R And then connected to the midpoint of the second leg;
the homonymous end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the third bridge arm, the heteronymous end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the fourth bridge arm, the homonymous end of the secondary winding of the second primary transformer T2 is connected between the homonymous end of the secondary winding of the first primary transformer T1 and the midpoint of the third bridge arm, and the heteronymous end of the secondary winding of the second primary transformer T2 is connected between the heteronymous end of the secondary winding of the first primary transformer T1 and the midpoint of the fourth bridge arm;
the inductance L m1 One end is connected to the inductance L R1 Between the same name end of the primary winding of the first primary transformer T1, the inductance L m1 Is connected to the other end of the inductor L m2 Is one end of the inductance L m2 Is connected to the other end of the inductor L R2 And the opposite-name end of the primary winding of the second primary transformer T2.
Further, the full-bridge circuit comprises a first bridge arm and a second bridge arm, the rectifying circuit comprises a third bridge arm and a fourth bridge arm, and the resonator comprises an inductance L R1 Inductance L R2 Inductance L m1 Inductance L m2 Capacitance C R ；
The same-name end of the primary winding of the first primary transformer T1 is connected in series with the inductor L R1 The second primary transformer T2 is connected to the midpoint of the first bridge arm, the synonym end of the primary winding of the first primary transformer T1 is connected to the synonym end of the primary winding of the second primary transformer T2, and the synonym ends of the primary windings of the second primary transformer T2 are sequentially connected in series with the inductor L R2 And the capacitor C R And then connected to the midpoint of the second leg;
the same-name end of the secondary winding of the first primary transformer T1 is connected to the middle point of the third bridge arm, the different-name end of the secondary winding of the first primary transformer T1 is connected to the middle point of the fourth bridge arm, the different-name end of the secondary winding of the second primary transformer T2 is connected between the same-name end of the secondary winding of the first primary transformer T1 and the middle point of the third bridge arm, and the same-name end of the secondary winding of the second primary transformer T2 is connected between the different-name end of the secondary winding of the first primary transformer T1 and the middle point of the fourth bridge arm;
the inductance L m1 One end is connected to the inductance L R1 Between the same name end of the primary winding of the first primary transformer T1, the inductance L m1 Is connected to the other end of the inductor L m2 Is one end of the inductance L m2 Is connected to the other end of the inductor L R2 And the same-name end of the primary winding of the second primary transformer T2.
Further, the full-bridge circuit comprises a first bridge arm and a second bridge arm, the rectifying circuit comprises a third bridge arm, a fourth bridge arm, a fifth bridge arm and a sixth bridge arm, and the resonator comprises an inductance L R1 Inductance L R2 Inductance L m1 Inductance L m2 Capacitance C R ；
The same-name end of the primary winding of the first primary transformer T1 is connected in series with the inductor L R1 The second primary transformer T2 is connected to the midpoint of the first bridge arm, the synonym end of the primary winding of the first primary transformer T1 is connected to the synonym end of the primary winding of the second primary transformer T2, and the synonym ends of the primary windings of the second primary transformer T2 are sequentially connected in series with the inductor L R2 And the capacitor C R And then connected to the midpoint of the second leg;
the homonymous end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the third bridge arm, the homonymous end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the fourth bridge arm, the homonymous end of the secondary winding of the second primary transformer T2 is connected to the midpoint of the fifth bridge arm, and the homonymous end of the secondary winding of the second primary transformer T2 is connected to the midpoint of the sixth bridge arm;
the inductance L m1 One end is connected to the inductance L R1 The same name end of the primary winding of the first primary transformer T1Between the inductors L m1 Is connected to the other end of the inductor L m2 Is one end of the inductance L m2 Is connected to the other end of the inductor L R2 And the same-name end of the primary winding of the second primary transformer T2.
Furthermore, all switching tubes in the full-bridge circuit adopt Mosfet tubes, and all switching tubes in the rectifying circuit adopt one of diodes or Mosfet tubes.
Further, the first primary transformer T1 and the second primary transformer T2 are magnetically integrated in a back-to-back arrangement manner, and the first primary transformer T1 and the second primary transformer T2 share a common side post, so that the magnetic flux in the common side post is 0.
Further, the common side post is filled with a non-magnetically conductive material for fixing the center post of the first primary transformer T1 and the center post of the second primary transformer T2.
Furthermore, the first primary transformer T1 and the second primary transformer T2 are magnetically integrated in a back-to-back arrangement manner, and no side post is disposed on one side of the first primary transformer T1 facing the second primary transformer T2 and one side of the second primary transformer T2 facing the first primary transformer T1, so that the side post of the first primary transformer T1 and the side post of the second primary transformer T2 form a closed loop.
Further, an air gap separating the first primary transformer T1 from the second primary transformer T2 is further provided at a position where the side posts of the first primary transformer T1 and the side posts of the second primary transformer T2 are attached to each other.
Further, the center post of the first primary transformer T1 and the center post of the second primary transformer T2 are connected to form a common center post, the primary winding of the first primary transformer T1 and the secondary winding of the first primary transformer T1 are both arranged on the common center post, and an air gap is arranged between the primary winding of the first primary transformer T1 and the secondary winding of the first primary transformer T1 at the position of the common center post;
the primary winding of the second primary transformer T2 and the secondary winding of the second primary transformer T2 are both disposed on the common center pillar, and an air gap is disposed between the primary winding of the second primary transformer T2 and the secondary winding of the second primary transformer T2 in the common center pillar.
Compared with the prior art, the invention has at least the following beneficial effects:
the LLC converter circuit is improved, and the primary side is connected in series and the secondary side is connected in parallel, so that the power level of the LLC converter circuit is improved. Meanwhile, by integrating the two primary transformers and connecting the two primary transformers through the common side column, the magnetic loss of the common side column is basically 0, the volume and the mass of the integrated transformer are effectively reduced, the required strength of the integrated transformer is reserved, and the quality problem is not easy to occur in the oscillation process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional LLC converter circuit topology;
FIG. 2 is a schematic diagram of the integrated transformer of the present invention with identical serial connection of identical name terminals;
FIG. 3 is a schematic diagram of the integrated transformer of the present invention with opposite serial connection of the same name end;
FIG. 4 is a schematic diagram of the secondary side of the integrated transformer of the present invention with rectification followed by parallel connection;
FIG. 5 is a schematic diagram of an LLC converter circuit employing a Mosfet tube instead of a diode;
FIG. 6 is a schematic diagram of a conventional series-parallel transformer;
FIG. 7 is a schematic diagram of a magnetically integrated series-parallel transformer according to the present invention;
FIG. 8 is a schematic illustration of the filling of a common jamb with a non-magnetically permeable material in accordance with the present invention;
FIG. 9 is a schematic view of the structure of the present invention with the common jambs removed;
FIG. 10 is a schematic view of the structure of the present invention with an air gap disposed at the jamb;
FIG. 11 is a schematic view of the structure of the present invention in which air gaps are provided between the center pillar and the side pillars.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the invention, not to imply that each embodiment of the invention must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
The principles and structures of the present invention are described in detail below with reference to the drawings and the examples.
Aiming at the problems of core-missing and short cores in the prior art, the invention aims to reduce the whole volume and the whole mass on the basis of improving the power level of the LLC converter circuit and the transformer by improving the integration mode of the LLC converter circuit and the transformer.
Referring to fig. 1, the llc converter circuit mainly consists of the following parts:
1. the full-bridge circuit consists of four Mosfet tubes, is directly connected with the bus capacitor and is used for converting direct-current voltage on the bus capacitor into high-frequency high-low level with the amplitude of Vbus+ and Vbus-for the later-stage circuit;
2. the rectification circuit consists of four diodes, is connected to the filtering circuit of the subsequent stage and the load and is used for rectifying the alternating current transmitted by the integrated transformer so as to transmit the alternating current to the load for work;
3. the integrated transformer is connected with the full-bridge circuit and the rectifying circuit in a magnetic coupling mode and is used for realizing energy transmission between the full-bridge circuit and the rectifying circuit;
4. the resonator consists of a capacitor and an inductor, is connected between the full-bridge circuit and the integrated transformer and is used for adjusting the input and output proportion of the integrated transformer by adjusting the impedance of the resonator through frequency, and meanwhile, soft switching conditions are provided for a switching tube in the full-bridge circuit and a diode in the rectifying circuit due to the existence of the resonator.
According to the invention, the integrated transformer is formed by adopting a magnetic integration mode, meanwhile, the primary winding of the first primary transformer T1 is connected with the primary winding of the second primary transformer T2 in series, the secondary winding of the first primary transformer T1 and the secondary winding of the second primary transformer T2 are connected in parallel, and in the design mode, the first primary transformer T1 and the second primary transformer T2 can share one magnetic core, so that the volume and the quality of the transformer are saved, and the generated integrated transformer simultaneously has the windings of the first primary transformer T1 and the second primary transformer T2.
Referring to fig. 2, the full-bridge circuit of the present invention includes a first bridge arm and a second bridge arm, the rectifying circuit includes a third bridge arm and a fourth bridge arm, and the resonator includes an inductance L R1 Inductance L R2 Inductance L m1 Inductance L m2 Capacitance C R ；
The same-name end series inductance L of the primary winding of the first primary transformer T1 R1 The second transformer T2 is connected to the midpoint of the first bridge arm, the opposite-name end of the primary winding of the first primary transformer T1 is connected to the same-name end of the primary winding of the second primary transformer T2, and the opposite-name ends of the primary winding of the second primary transformer T2 are sequentially connected in series with an inductor L R2 And electricityCapacitor C R And then connected to the midpoint of the second leg;
the same-name end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the third bridge arm, the different-name end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the fourth bridge arm, the same-name end of the secondary winding of the second primary transformer T2 is connected between the same-name end of the secondary winding of the first primary transformer T1 and the midpoint of the third bridge arm, and the different-name end of the secondary winding of the second primary transformer T2 is connected between the different-name end of the secondary winding of the first primary transformer T1 and the midpoint of the fourth bridge arm;
inductance L m1 One end is connected to the inductance L R1 Between the same-name ends of the primary winding of the first primary transformer T1, the inductance L m1 Is connected to the other end of the inductor L m2 Is one end of the inductance L m2 Is connected to the other end of the inductor L R2 And the opposite-name end of the primary winding of the second primary transformer T2.
The main difference of this scheme compared to the conventional LLC converter topology is that: (1) When the capacity is expanded in the mode of fig. 2, the capacity of each switching tube and each diode is also increased; (2) In order to ensure that the same gain is achieved with the traditional LLC converter circuit under the same switching frequency, key parameters such as the resonant frequency of the resonator and the like are kept unchanged basically, so that the primary side turn ratio of the transformer is halved, and the secondary side is unchanged. Therefore, the excitation inductance of the resonator is changed into one fourth of the original excitation inductance, the leakage inductance is also changed into one fourth of the original excitation inductance, the excitation inductance and the leakage inductance of the resonator are connected in series by adopting the primary side of the integrated transformer, the inductance value of the whole excitation inductance and the leakage inductance of the resonator is changed into one half of the original excitation inductance and the leakage inductance of the resonator, and the ratio of the excitation inductance and the leakage inductance is not changed; (3) In order to ensure that the resonance frequency is unchanged, the capacitance of the resonance capacitor is doubled, so that important parameters of the resonator are the same as those of fig. 1.
Through the design, the power level of the invention can be improved, so that the charging requirement of a new energy automobile with higher power level can be met.
In addition, the connection mode in the embodiment of fig. 2 is that the first primary transformer T1 and the second primary transformer T2 are connected in series with the same homonymous terminal directionIn other embodiments of the present invention, the same effect can be achieved by connecting the first primary transformer T1 and the second primary transformer T2 in series with opposite identical ends. Referring to fig. 3 specifically, in this embodiment, the full-bridge circuit includes a first leg and a second leg, the rectifying circuit includes a third leg and a fourth leg, and the resonator includes an inductance L R1 Inductance L R2 Inductance L m1 Inductance L m2 Capacitance C R ；
The same-name end series inductance L of the primary winding of the first primary transformer T1 R1 And then is connected to the midpoint of the first bridge arm, the synonym end of the primary winding of the first primary transformer T1 is connected to the synonym end of the primary winding of the second primary transformer T2, and the synonym ends of the primary windings of the second primary transformer T2 are sequentially connected in series with an inductor L R2 And capacitor C R And then connected to the midpoint of the second leg;
the homonymous end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the third bridge arm, the heteronymous end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the fourth bridge arm, the heteronymous end of the secondary winding of the second primary transformer T2 is connected between the homonymous end of the secondary winding of the first primary transformer T1 and the midpoint of the third bridge arm, and the homonymous end of the secondary winding of the second primary transformer T2 is connected between the heteronymous end of the secondary winding of the first primary transformer T1 and the midpoint of the fourth bridge arm;
inductance L m1 One end is connected to the inductance L R1 Between the same-name ends of the primary winding of the first primary transformer T1, the inductance L m1 Is connected to the other end of the inductor L m2 Is one end of the inductance L m2 Is connected to the other end of the inductor L R2 And the same-name end of the primary winding of the second primary transformer T2.
Furthermore, in other embodiments of the present invention, for the design of the second primary transformer T2, the alternating current transmitted by the integrated transformer may be rectified first, and then the secondary windings are processed in parallel, so as to further improve the power level. Referring to fig. 4, in this embodiment, the full-bridge circuit includes a first bridge arm and a second bridge arm, and the rectifying circuit includes a third bridge arm and a fourth bridge armA fifth bridge arm, and a sixth bridge arm, the resonator including an inductance L R1 Inductance L R2 Inductance L m1 Inductance L m2 Capacitance C R ；
The same-name end series inductance L of the primary winding of the first primary transformer T1 R1 And then is connected to the midpoint of the first bridge arm, the synonym end of the primary winding of the first primary transformer T1 is connected to the synonym end of the primary winding of the second primary transformer T2, and the synonym ends of the primary windings of the second primary transformer T2 are sequentially connected in series with an inductor L R2 And capacitor C R And then connected to the midpoint of the second leg;
the homonymous end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the third bridge arm, the heteronymous end of the secondary winding of the first primary transformer T1 is connected to the midpoint of the fourth bridge arm, the heteronymous end of the secondary winding of the second primary transformer T2 is connected to the midpoint of the fifth bridge arm, and the homonymous end of the secondary winding of the second primary transformer T2 is connected to the midpoint of the sixth bridge arm;
inductance L m1 One end is connected to the inductance L R1 Between the same-name ends of the primary winding of the first primary transformer T1, the inductance L m1 Is connected to the other end of the inductor L m2 Is one end of the inductance L m2 Is connected to the other end of the inductor L R2 And the same-name end of the primary winding of the second primary transformer T2.
In the embodiments of fig. 2 to 4, the rectifying circuits all adopt uncontrollable diodes for rectification, and in other embodiments, mosfet tubes can be used to replace the diodes, and the same technical effect can be achieved by driving and rectifying through PWM signals. In addition, the Mosfet tube is adopted to replace a diode, so that the control of the rectifying circuit is more flexible, and the soft switching control is easier to realize. That is, for the present invention, all switching tubes in the full-bridge circuit are Msofet tubes, all switching tubes in the rectifying circuit are diodes or one of Mosfet tubes, and the specific implementation is shown in fig. 5, and will not be described here again.
The circuit topologies shown in fig. 2 to 4 require two primary transformers, which relatively increase the volume and quality of the system, and in order to reduce the size of the transformer and increase the power density and reduce the core loss, the two primary transformers are integrated into an integrated transformer in the present invention, please refer to fig. 6, in which the first primary transformer T1 and the second primary transformer T2 are magnetically integrated in a back-to-back arrangement (in the present invention, the first primary transformer T1 is denoted by T1 and the second primary transformer T2 is denoted by T2), and the first primary transformer T1 and the second primary transformer T2 share a common side post, wherein each winding in the first primary transformer T1 and each winding in the second primary transformer T2 can be connected in any one of fig. 2 to 4.
Taking the case of the opposite serial connection of the same-name ends of the two primary transformers (fig. 3 embodiment) as an example, please refer to fig. 7, since the same-name ends of the two primary transformers are connected in opposite directions, the magnetic flux Φ1 generated by the first primary transformer 1 on the common side post is from bottom to top, and the magnetic flux Φ2 generated by the second primary transformer T2 on the common side post is from top to bottom, considering that the parameters of the two primary transformers are identical, the magnetic fluxes generated by the first primary transformer T1 and the second primary transformer T2 cancel each other on the common side post, and the magnetic flux is 0. This brings about several advantages:
1. the magnetic loss of the common side column is basically 0;
2. the volume and the mass of the integrated transformer are effectively reduced in a mode of sharing the side column;
3. the existence of one side column also maintains the strength required by the integrated transformer, and the quality problem is not easy to occur in the oscillating process.
Referring to fig. 8, in other embodiments of the present invention, the common side post may be filled with a non-magnetically conductive material for fixing the center post of the first primary transformer T1 and the center post of the second primary transformer T2.
Referring to fig. 9, in another embodiment of the present invention, the first primary transformer T1 and the second primary transformer T2 are magnetically integrated in a back-to-back manner, and no side post is disposed on one side of the first primary transformer T1 facing the second primary transformer T2 and one side of the second primary transformer T2 facing the first primary transformer T1, so that the side post of the first primary transformer T1 and the side post of the second primary transformer T2 form a closed loop.
For the solution of the embodiment of fig. 9, the air gap may not be necessarily left only on the center pillar, but also on the side pillars, please refer to fig. 10, in this embodiment, an air gap separating the first primary transformer T1 and the second primary transformer T2 is further provided at the position where the side pillars of the first primary transformer T1 and the second primary transformer T2 are attached to each other.
Referring to fig. 11, in still another embodiment of the present invention, an air gap may be disposed on both the side leg and the center leg, in which the center leg of the first primary transformer T1 and the center leg of the second primary transformer T2 are connected to form a common center leg, the primary winding of the first primary transformer T1 and the secondary winding of the first primary transformer T1 are disposed on the common center leg, and the air gap is disposed between the primary winding of the first primary transformer T1 and the secondary winding of the first primary transformer T1;
the primary winding of the second primary transformer T2 and the secondary winding of the second primary transformer T2 are both arranged on a common center pillar, and an air gap is arranged between the primary winding of the second primary transformer T2 and the secondary winding of the second primary transformer T2 at the position of the common center pillar.
Compared with the prior art, the LLC converter circuit is improved, and the power level of the LLC converter circuit is improved in a primary side series connection and secondary side parallel connection mode. Meanwhile, by integrating the two primary transformers and connecting the two primary transformers through the common side column, the magnetic loss of the common side column is basically 0, the volume and the mass of the integrated transformer are effectively reduced, the required strength of the integrated transformer is reserved, and the quality problem is not easy to occur in the oscillation process.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. The LLC converter circuit comprises a full-bridge circuit connected with a bus capacitor, a rectifying circuit connected with a filter capacitor and a load, an integrated transformer connected with the full-bridge circuit and the rectifying circuit in a magnetic coupling mode, and a resonator connected between the full-bridge circuit and the integrated transformer, and is characterized in that the integrated transformer is formed in a magnetic integration mode through a first primary transformer (T1) and a second primary transformer (T2), a primary winding of the first primary transformer (T1) is connected with a primary winding of the second primary transformer (T2) in series, and a secondary winding of the first primary transformer (T1) is connected with a secondary winding of the second primary transformer (T2) in parallel so as to improve the power grade of the LLC converter circuit.
2. The LLC converter circuit of claim 1, wherein the full-bridge circuit comprises a first leg and a second leg, the rectifier circuit comprises a third leg and a fourth leg, and the resonator comprises an inductance (L R1 ) Inductance (L) R2 ) Inductance (L) m1 ) Inductance (L) m2 ) Capacitor (C) R )；
The same name end of the primary winding of the first primary transformer (T1) is connected in series with the inductor (L R1 ) And then connected to the midpoint of the first bridge arm, the synonym end of the primary winding of the first primary transformer (T1) is connected to the synonym end of the primary winding of the second primary transformer (T2), and the synonym ends of the primary winding of the second primary transformer (T2) are sequentially connected in series with the inductor (L R2 ) And the capacitance (C R ) And then connected to the midpoint of the second leg;
the same-name end of the secondary winding of the first primary transformer (T1) is connected to the middle point of the third bridge arm, the different-name end of the secondary winding of the first primary transformer (T1) is connected to the middle point of the fourth bridge arm, the same-name end of the secondary winding of the second primary transformer (T2) is connected between the same-name end of the secondary winding of the first primary transformer (T1) and the middle point of the third bridge arm, and the different-name end of the secondary winding of the second primary transformer (T2) is connected between the different-name end of the secondary winding of the first primary transformer (T1) and the middle point of the fourth bridge arm;
said inductance (L m1 ) One end is connected to the inductance (L R1 ) Between the same-name ends of the primary winding of the first primary transformer (T1), the inductance (L m1 ) Is connected to the other end of the inductor (L m2 ) Is arranged at one end of the inductor (L m2 ) Is connected to the other end of the inductor (L R2 ) And the opposite-name end of the primary winding of the second primary transformer (T2).
3. The LLC converter circuit of claim 1, wherein the full-bridge circuit comprises a first leg and a second leg, the rectifier circuit comprises a third leg and a fourth leg, and the resonator comprises an inductance (L R1 ) Inductance (L) R2 ) Inductance (L) m1 ) Inductance (L) m2 ) Capacitor (C) R )；
The same name end of the primary winding of the first primary transformer (T1) is connected in series with the inductor (L R1 ) And then connected to the midpoint of the first bridge arm, the synonym end of the primary winding of the first primary transformer (T1) is connected to the synonym end of the primary winding of the second primary transformer (T2), and the synonym ends of the primary windings of the second primary transformer (T2) are sequentially connected in series with the inductor (L R2 ) And the capacitance (C R ) And then connected to the midpoint of the second leg;
the same-name end of the secondary winding of the first primary transformer (T1) is connected to the middle point of the third bridge arm, the different-name end of the secondary winding of the first primary transformer (T1) is connected to the middle point of the fourth bridge arm, the different-name end of the secondary winding of the second primary transformer (T2) is connected between the same-name end of the secondary winding of the first primary transformer (T1) and the middle point of the third bridge arm, and the same-name end of the secondary winding of the second primary transformer (T2) is connected between the different-name end of the secondary winding of the first primary transformer (T1) and the middle point of the fourth bridge arm;
said inductance (L m1 ) One end is connected to the inductance (L R1 ) Is of the same name as the primary winding of the first primary transformer (T1)Between the ends, the inductance (L m1 ) Is connected to the other end of the inductor (L m2 ) Is arranged at one end of the inductor (L m2 ) Is connected to the other end of the inductor (L R2 ) And the same-name end of the primary winding of the second primary transformer (T2).
4. The LLC converter circuit of claim 1, wherein the full-bridge circuit includes a first leg and a second leg, the rectifier circuit includes a third leg, a fourth leg, a fifth leg, and a sixth leg, and the resonator includes an inductor (L R1 ) Inductance (L) R2 ) Inductance (L) m1 ) Inductance (L) m2 ) Capacitor (C) R )；
The same name end of the primary winding of the first primary transformer (T1) is connected in series with the inductor (L R1 ) The second primary transformer (T2) is connected to the midpoint of the first bridge arm, the synonym end of the primary winding of the first primary transformer (T1) is connected to the synonym end of the primary winding of the second primary transformer (T2), and the synonym ends of the primary windings of the second primary transformer (T2) are sequentially connected in series with the inductor L R2 And the capacitance (C R ) And then connected to the midpoint of the second leg;
the same-name end of the secondary winding of the first primary transformer (T1) is connected to the middle point of the third bridge arm, the different-name end of the secondary winding of the first primary transformer (T1) is connected to the middle point of the fourth bridge arm, the different-name end of the secondary winding of the second primary transformer (T2) is connected to the middle point of the fifth bridge arm, and the same-name end of the secondary winding of the second primary transformer (T2) is connected to the middle point of the sixth bridge arm;
said inductance (L m1 ) One end is connected to the inductance (L R1 ) Between the same-name ends of the primary winding of the first primary transformer (T1), the inductance (L m1 ) Is connected to the other end of the inductor (L m2 ) Is arranged at one end of the inductor (L m2 ) Is connected to the other end of the inductor (L R2 ) And the same-name end of the primary winding of the second primary transformer (T2).
5. The LLC converter circuit of claim 1, wherein all switching tubes in the full-bridge circuit are Mosfet tubes, and all switching tubes in the rectifier circuit are either diodes or Mosfet tubes.
6. A LLC converter circuit according to claim 3, characterized in that the first primary transformer (T1) and the second primary transformer (T2) are magnetically integrated in a back-to-back arrangement, and that the first primary transformer (T1) and the second primary transformer (T2) share a common limb such that the magnetic flux in the common limb is 0.
7. An LLC converter circuit according to claim 6, characterized in that the common side leg is filled with a non-magnetically permeable material for fixing the leg of the first primary transformer (T1) and the leg of the second primary transformer (T2).
8. A LLC converter circuit according to claim 3, characterized in that the first primary transformer (T1) is magnetically integrated with the second primary transformer (T2) in a back-to-back arrangement, and that no side leg is provided on either the side of the first primary transformer (T1) facing the second primary transformer (T2) or on the side of the second primary transformer (T2) facing the first primary transformer (T1), such that the side legs of the first primary transformer (T1) and the side legs of the second primary transformer (T2) form a closed loop.
9. An LLC converter circuit according to claim 8, characterized in that, at the point where the side legs of the first primary transformer (T1) and the second primary transformer (T2) are in mutual abutment, an air gap separating the first primary transformer (T1) and the second primary transformer (T2) is also provided.
10. The LLC converter circuit according to claim 9, characterized in that the center leg of the first primary transformer (T1) and the center leg of the second primary transformer (T2) are connected to each other to form a common center leg, the primary winding of the first primary transformer (T1) and the secondary winding of the first primary transformer (T1) being both arranged on the common center leg, and that an air gap is provided between the primary winding of the first primary transformer (T1) and the secondary winding of the first primary transformer (T1) at the common center leg;
the primary winding of the second primary transformer (T2) and the secondary winding of the second primary transformer (T2) are both arranged on the common center post, and an air gap is arranged between the primary winding of the second primary transformer (T2) and the secondary winding of the second primary transformer (T2) at the position of the common center post.
CN202310367538.5A 2023-04-07 2023-04-07 LLC converter circuit Pending CN116345917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310367538.5A CN116345917A (en) 2023-04-07 2023-04-07 LLC converter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310367538.5A CN116345917A (en) 2023-04-07 2023-04-07 LLC converter circuit

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Publication Number Publication Date
CN116345917A true CN116345917A (en) 2023-06-27

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CN202310367538.5A Pending CN116345917A (en) 2023-04-07 2023-04-07 LLC converter circuit

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CN (1) CN116345917A (en)

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