CN106936320B - Interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter - Google Patents

Interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter Download PDF

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CN106936320B
CN106936320B CN201710329118.2A CN201710329118A CN106936320B CN 106936320 B CN106936320 B CN 106936320B CN 201710329118 A CN201710329118 A CN 201710329118A CN 106936320 B CN106936320 B CN 106936320B
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resonant
magnetic
shaped iron
iron core
integrated
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CN106936320A (en
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杨玉岗
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Liaoning Technical University
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Liaoning Technical University
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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
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • H02M3/1586—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
    • 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 provides a staggered parallel magnetic integrated bidirectional full-bridge LLC resonant converter, and relates to the technical field of power electronic application. The full-bridge LLC resonant converter comprises two paths of bidirectional full-bridge LLC resonant converters which are connected in parallel in a staggered manner; the first-path bidirectional full-bridge LLC resonant converter comprises a first primary circuit, a first secondary circuit, a resonant transformer and an excitation inductance thereof; the second bidirectional full-bridge LLC resonant converter comprises a second primary circuit, a second secondary circuit, a resonant transformer and an excitation inductance thereof; the primary side circuit and the secondary side circuit of each bidirectional full-bridge LLC resonant converter adopt full-bridge LLC resonant circuits for realizing bidirectional energy circulation; two resonant transformers in the two-way staggered parallel bidirectional full-bridge LLC resonant converter and excitation inductors and four resonant inductors are magnetically integrated by adopting an integrated magnetic piece. The invention can realize high-power, high-transformation ratio, small-volume and bidirectional high-efficiency operation of electric energy.

Description

Interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter
Technical Field
The invention relates to the technical field of power electronic application, in particular to a staggered parallel magnetic integration bidirectional full-bridge LLC resonant converter.
Background
In recent years, switching power supplies for supplying electric energy to various electric devices are advancing toward low voltage, large current, small volume, light weight, high efficiency, thinning and integration, including voltage regulation modules for providing precise power supplies for high-precision, high-speed microprocessors such as a central Processing unit (Central Processing Unit, CPU) and a digital signal processor (DIGITAL SIGNAL Processing, DSP) of a computer, and bidirectional switching power supplies which are widely used in electric vehicles, hybrid vehicles, uninterruptible power supplies, electric energy quality regulation power supplies, aviation power supplies, new energy power generation, superconducting energy storage and other occasions requiring energy bidirectional flow in recent years, and these switching power supplies can realize ZVS in a full load range by adopting the topology structure of an LLC converter, and since the converter has no filter inductance on the secondary side, if full-bridge rectification is adopted, the voltage stress of a rectifying diode is only output voltage, ZCS can be realized, and switching losses can be reduced. In addition, in order to reduce the volume of the LLC resonant converter, it is necessary to integrate its resonant transformer and resonant inductor.
Most LLC converters in the prior art adopt a half-bridge structure, can only run unidirectionally, and the magnetic integration only realizes the integration of a single transformer and a single inductor, so that the high-power, high transformation ratio, small volume and bidirectional high-efficiency running of the LLC resonant converter are difficult to realize.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the interleaved parallel magnetic integration bidirectional full-bridge LLC resonant converter, which realizes the interleaved parallel connection of the full-bridge LLC resonant converter, and the bidirectional operation and the magnetic integration after the interleaved parallel connection, and realizes the high-power, high transformation ratio, small volume and bidirectional high-efficiency operation of the LLC resonant converter.
The interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter comprises two paths of interleaved parallel bidirectional full-bridge LLC resonant converters, wherein a resonant transformer and a resonant inductor in the two paths of interleaved parallel bidirectional full-bridge LLC resonant converters adopt an integrated magnetic piece to realize magnetic integration; the first-path bidirectional full-bridge LLC resonant converter comprises a first primary circuit, a first secondary circuit, a resonant transformer T R1 and an excitation inductance L m1; the first primary circuit comprises a power switch tube S 11～S14, a resonant inductor L 11 and a resonant capacitor C 11; the first secondary circuit comprises a power switch tube S 15～S18, a resonant inductor L 12 and a resonant capacitor C 12; the second bidirectional full-bridge LLC resonant converter comprises a second primary circuit, a second secondary circuit and a resonant transformer T R2 and excitation inductance L m2 thereof; the second primary circuit comprises a power switch tube S 21～S24, a resonant inductor L 21 and a resonant capacitor C 21; the second secondary circuit comprises a power switch tube S 25～S28, a resonant inductor L 22 and a resonant capacitor C 22; the primary side circuit and the secondary side circuit of each two-way full-bridge LLC resonant converter adopt full-bridge LLC resonant circuits for realizing two-way energy circulation.
Further, in one scheme, the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter further includes two input capacitors C 1 and C 2, the input capacitors C 1 and C 2 are connected in series, the input capacitor C 1 after being connected in series is connected to two input ends of the first path bidirectional full-bridge LLC resonant converter, and the input capacitor C 2 is connected to two input ends of the second path bidirectional full-bridge LLC resonant converter.
The other scheme is that the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter further comprises an intermediate capacitor C and two paths of interleaved parallel magnetic integrated bidirectional Buck/Boost converters; the first path of bidirectional Buck/Boost converter comprises a power switch tube S 1、S2 and an inductor L 1, and the second path of bidirectional Buck/Boost converter comprises a power switch tube S 3、S4 and an inductor L 2; the inductor L 1 of the first path of bidirectional Buck/Boost converter and the inductor L 2 of the second path of bidirectional Buck/Boost converter are subjected to reverse magnetic coupling to form a magnetic integration coupling inductor; the output ends of the two paths of the two-way Buck/Boost converters after staggered parallel connection are connected with the middle capacitor C in parallel, and the input ends of the two paths of the two-way full-bridge LLC resonant converters after staggered parallel connection are connected with the two ends of the middle capacitor C.
Or the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter also comprises an intermediate capacitor C and two paths of interleaved parallel magnetic integrated bidirectional Buck/Boost converters, wherein the first path of bidirectional Buck/Boost converter comprises a power switch tube S 1、S2 and an inductor L 1, and the second path of bidirectional Buck/Boost converter comprises a power switch tube S 3、S4 and an inductor L 1; the inductor L 1 of the first path of bidirectional Buck/Boost converter and the inductor L 2 of the second path of bidirectional Buck/Boost converter are subjected to reverse magnetic coupling to form a magnetic integration coupling inductor; the input ends of the two paths of the two-way Buck/Boost converters after staggered parallel connection are connected with the middle capacitor C in parallel, and the output ends of the two paths of the two-way full-bridge LLC resonant converters after staggered parallel connection are connected to the two ends of the middle capacitor C.
Further, the integrated magnetic component for realizing the magnetic integration of the resonant transformers in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a resonant transformer integrated magnetic component, and is used for the magnetic integration of the resonant transformer T R1 and the exciting inductance L m1 thereof and the resonant transformer T R2 and the exciting inductance L m2 thereof in the two-way staggered parallel bidirectional full-bridge LLC resonant converter; the integrated magnetic part for realizing the magnetic integration of the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a resonant inductor integrated magnetic part and is used for the magnetic integration of the resonant inductor L 11、L21 and the magnetic integration of the resonant inductor L 12、L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter;
The iron core of the integrated magnetic part of the resonance transformer is of an EE-shaped iron core structure and comprises two E-shaped iron cores with opposite magnetic columns, wherein an air gap is not reserved between middle columns of the two E-shaped iron cores, and air gaps are reserved between upper magnetic columns and lower magnetic columns; n 11、N12 windings are respectively wound on upper magnetic columns of the two E-shaped iron cores of the EE-shaped iron core structure to form a resonant transformer T R1 and exciting inductance L m1 thereof, and N 21、N22 windings are respectively wound on lower magnetic columns to form a resonant transformer T R2 and exciting inductance L m2 thereof;
The iron core of the resonant inductor integrated magnetic piece is of an EI-shaped iron core structure and comprises an E-shaped iron core and an I-shaped iron core, wherein the I-shaped iron core is arranged on the opening side of the E-shaped iron core, and air gaps are arranged between three magnetic columns of the E-shaped iron core and the I-shaped iron core; windings are wound on the upper side magnetic column of the E-shaped iron core of the resonant inductor integrated magnetic piece to form resonant inductors L 11 or L 12, and windings are wound on the lower side magnetic column to form resonant inductors L 21 or L 22.
Further, the integrated magnetic component for realizing the magnetic integration of the resonant transformers in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a resonant transformer integrated magnetic component, and is used for the magnetic integration of the resonant transformer T R1 and the exciting inductance L m1 thereof and the resonant transformer T R2 and the exciting inductance L m2 thereof in the two-way staggered parallel bidirectional full-bridge LLC resonant converter; the integrated magnetic part for realizing the magnetic integration of the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a resonant inductor integrated magnetic part and is used for the magnetic integration of the resonant inductor L 11、L21 and the magnetic integration of the resonant inductor L 12、L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter;
The iron core of the resonant transformer integrated magnetic piece and the iron core of the resonant inductance integrated magnetic piece are of iron core structures comprising a cross-shaped iron core and two E-shaped iron cores, and the cross-shaped iron core is arranged between the E-shaped iron cores with the two opposite magnetic columns;
An air gap is not reserved between the middle columns of the two E-shaped iron cores of the resonant transformer integrated magnetic piece and the left and right transverse yokes of the cross-shaped iron core of the resonant transformer integrated magnetic piece, and an air gap is reserved between the upper or lower side magnetic columns of the two E-shaped iron cores of the resonant transformer integrated magnetic piece and the upper or lower side magnetic columns of the cross-shaped iron cores of the resonant transformer integrated magnetic piece; n 11、N12 windings are respectively wound on upper magnetic columns of the cross-shaped iron cores of the resonant transformer integrated magnetic pieces to form a resonant transformer T R1 and exciting inductance L m1 thereof, and N 21、N22 windings are respectively wound on lower magnetic columns to form a resonant transformer T R2 and exciting inductance L m2 thereof;
An air gap is arranged between the middle columns of the two E-shaped iron cores of the resonant inductor integrated magnetic piece and the left and right transverse yokes of the cross-shaped iron core of the resonant inductor integrated magnetic piece, and an air gap is arranged between the upper or lower side magnetic columns of the two E-shaped iron cores of the resonant inductor integrated magnetic piece and the upper or lower side magnetic columns of the cross-shaped iron cores of the resonant inductor integrated magnetic piece; windings are wound on the upper side magnetic columns of the cross-shaped iron cores of the resonant inductor integrated magnetic pieces to form resonant inductors L 11 or L 12, and windings are wound on the lower side magnetic columns to form resonant inductors L 21 or L 22.
Further, the integrated magnetic component for realizing the magnetic integration of the resonant transformers in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a resonant transformer integrated magnetic component, and is used for the magnetic integration of the resonant transformer T R1 and the exciting inductance L m1 thereof and the resonant transformer T R2 and the exciting inductance L m2 thereof in the two-way staggered parallel bidirectional full-bridge LLC resonant converter; the integrated magnetic part for realizing the magnetic integration of the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a resonant inductor integrated magnetic part and is used for the magnetic integration of the resonant inductor L 11、L21 and the magnetic integration of the resonant inductor L 12、L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter;
The iron core of the resonant transformer integrated magnetic piece and the iron core of the resonant inductance integrated magnetic piece are of iron core structures comprising a cross-shaped iron core and two cross-shaped iron cores, and the cross-shaped iron core is arranged between the two cross-shaped iron cores with opposite openings;
An air gap is not reserved between the middle parts of the two [ -shaped iron cores of the resonant transformer integrated magnetic piece and the left and right transverse yokes of the [ -shaped iron core of the resonant transformer integrated magnetic piece, and an air gap is reserved between the upper or lower side magnetic column of the [ -shaped iron core of the resonant transformer integrated magnetic piece and the upper or lower side magnetic column of the [ -shaped iron core of the resonant transformer integrated magnetic piece; n 11、N12 windings are wound on the upper side magnetic columns of the cross-shaped iron cores of the resonant transformer integrated magnetic pieces to form a resonant transformer T R1 and exciting inductance L m1 thereof, and N 21、N22 windings are wound on the lower side magnetic columns to form a resonant transformer T R2 and exciting inductance L m2 thereof;
An air gap is arranged between the middle part of the two iron cores of the resonant inductor integrated magnetic part and the left and right transverse yokes of the cross iron core of the resonant inductor integrated magnetic part, and an air gap is arranged between the upper or lower magnetic column of the iron cores of the resonant inductor integrated magnetic part and the upper or lower magnetic column of the cross iron core of the resonant inductor integrated magnetic part; windings are wound on the upper side magnetic columns of the cross-shaped iron cores of the resonant inductor integrated magnetic pieces to form resonant inductors L 11 or L 12, and windings are wound on the lower side magnetic columns to form resonant inductors L 21 or L 22.
Further, the integrated magnetic component for realizing the magnetic integration of the resonant transformer and the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a staggered parallel full-integrated magnetic component, and is used for the magnetic integration of the resonant transformer T R1 and the excitation inductor L m1 thereof, the resonant transformer T R2 and the excitation inductor L m2 thereof in the two-way staggered parallel bidirectional full-bridge LLC resonant converter and the four resonant inductors L 11、L12、L21、L22;
The iron core of the staggered parallel full-integrated magnetic piece comprises two E-shaped iron cores and two I-shaped iron cores, the magnetic columns of the two E-shaped iron cores are oppositely arranged to form an EE-shaped iron core structure, no air gap is arranged between the middle columns of the two E-shaped iron cores, and air gaps are arranged between the upper side magnetic columns and the lower side magnetic columns; two I-shaped iron cores are respectively vertically arranged between an upper window and a lower window of the EE-shaped iron core structure; n 11、N12 windings are respectively wound on the upper magnetic columns of the two E-shaped iron cores of the EE-shaped iron core structure to form a resonant transformer T R1 and an exciting inductance L m1 thereof, N 21、N22 windings are respectively wound on the lower magnetic columns to form a resonant transformer T R2 and an exciting inductance L m2.N11 and an N 12 winding or N 21 and an N 22 winding, the magnetic fields generated by the windings cannot mutually pass through each other, and a part of the magnetic fields respectively return through the I-shaped iron cores arranged in the upper window or the lower window of the EE-shaped iron core structure to form leakage magnetic flux And/>Or leakage flux/>And/>Leakage inductance is formed as resonance inductance, and resonance inductances L 11 and L 12 or resonance inductances L 21 and L 22 are formed, respectively.
Further, the integrated magnetic component for realizing the magnetic integration of the resonant transformer and the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a staggered parallel full-integrated magnetic component, and is used for the magnetic integration of the resonant transformer T R1 and the excitation inductor L m1 thereof, the resonant transformer T R2 and the excitation inductor L m2 thereof in the two-way staggered parallel bidirectional full-bridge LLC resonant converter and the four resonant inductors L 11、L12、L21、L22;
The iron core of the staggered parallel full-integrated magnetic piece comprises four E-shaped iron cores, wherein the magnetic columns of the two E-shaped iron cores are oppositely arranged to form an EE-shaped iron core structure, no air gap exists between the middle columns of the two E-shaped iron cores, and air gaps are arranged between the upper side magnetic columns and between the lower side magnetic columns; n 11、N12 windings are respectively wound on upper magnetic columns of the two E-shaped iron cores of the EE-shaped iron core structure to form a resonant transformer T R1 and exciting inductance L m1 thereof, and N 21、N22 windings are respectively wound on lower magnetic columns to form a resonant transformer T R2 and exciting inductance L m2 thereof; the opening direction of the third E-shaped iron core is arranged towards one side of the winding N 11、N12 of the EE-shaped iron core, and an air gap is arranged between three magnetic columns of the E-shaped iron core and the upper magnetic columns of the two E-shaped iron cores of the EE-shaped iron core; the magnetic fields generated by the N 11 winding and the N 12 winding can not pass through each other completely, and a part of the magnetic fields return through the magnetic columns of the third E-shaped iron core to form leakage magnetic flux And/>Leakage inductance is formed as resonant inductance, and resonant inductances L 11 and L 12 are formed respectively; the opening direction of the fourth E-shaped iron core is arranged towards one side of the winding N 21、N22 of the EE-shaped iron core, and an air gap is arranged between three magnetic columns of the E-shaped iron core and the lower magnetic columns of the two E-shaped iron cores of the EE-shaped iron core; the magnetic fields generated by the N 21 winding and the N 22 winding cannot all pass through each other, and a part of the magnetic fields return through the magnetic column of the fourth E-shaped iron core to form leakage magnetic flux/>And/>Leakage inductance is formed as resonance inductance, and resonance inductances L 21 and L 22 are formed, respectively.
Further, the integrated magnetic component for realizing the magnetic integration of the resonant transformer and the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a staggered parallel full-integrated magnetic component, and is used for the magnetic integration of the resonant transformer T R1 and the excitation inductor L m1 thereof, the resonant transformer T R2 and the excitation inductor L m2 thereof in the two-way staggered parallel bidirectional full-bridge LLC resonant converter and the four resonant inductors L 11、L12、L21、L22;
The iron cores of the staggered parallel full-integrated magnetic piece comprise three groups of EE-shaped iron cores which are sequentially arranged front and back, two E-shaped iron cores in each group of EE-shaped iron cores are placed up and down, and air gaps are arranged among three magnetic columns of the two E-shaped iron cores placed up and down; the three groups of EE-shaped iron cores are sequentially a first group of EE-shaped iron cores, a second group of EE-shaped iron cores and a third group of EE-shaped iron cores from front to back; n 11 windings are wound on the same side magnetic columns of the upper sheet iron cores of the first group of EE iron cores and the upper sheet iron cores of the second group of EE iron cores, N 12 windings are wound on the same side magnetic columns of the lower sheet iron cores of the second group of EE iron cores and the lower sheet iron cores of the third group of EE iron cores, N 11 windings and N 12 windings are positioned on the same side, N 11 windings on the upper sheet iron cores of the second group of EE iron cores and N 12 windings on the lower sheet iron cores form a resonant transformer T R1 and excitation inductance L m1 thereof, N 11 windings on the upper sheet iron cores of the first group of EE iron cores form a resonant inductance L 11, and N 12 windings on the lower sheet iron cores of the third group of EE iron cores form a resonant inductance L 12; n 21 windings are wound on the magnetic columns on the other sides of the upper sheet iron cores of the first group of EE-shaped iron cores and the upper sheet iron cores of the second group of EE-shaped iron cores, N 22 windings are wound on the magnetic columns on the other sides of the lower sheet iron cores of the second group of EE-shaped iron cores and the lower sheet iron cores of the third group of EE-shaped iron cores, N 21 windings and N 22 windings are positioned on the same side, the N 21 windings on the upper sheet iron cores of the second group of EE-shaped iron cores and the N 22 windings on the lower sheet iron cores form a resonant transformer T R2 and excitation inductance L m2 thereof, the N 21 windings on the upper sheet iron cores of the first group of EE-shaped iron cores form a resonant inductance L 21, and the N 22 windings on the lower sheet iron cores of the third group of EE-shaped iron cores form a resonant inductance L 22.
According to the technical scheme, the beneficial effects of the invention are as follows: the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter provided by the invention realizes high-power, high transformation ratio, small volume and bidirectional high-efficiency operation of the LLC resonant converter through the interleaved parallel connection of the two paths of full-bridge LLC resonant converters and the bidirectional operation and magnetic integration after the interleaved parallel connection.
Two or more paths of full-bridge LLC resonant converters run in parallel in two directions, the power and the capacity of the converters are multiplied, and the forward and reverse transmission of high voltage of electric energy is realized; by performing interleaving control and path shielding control on the multi-path parallel converters, when the load requires high power, the multi-path converters are simultaneously put into operation, and when the load requires low power, the number of paths of the converters is reduced, and the efficiency of the converters, especially the light load efficiency, is improved; the input end of the staggered parallel magnetic integrated bidirectional full-bridge LLC resonant converter is connected with two input capacitors in parallel, when the input voltage of the high-voltage side of the converter is higher, the withstand voltage of the power switch tube is reduced, LLC resonant conversion is realized in a full load range, so that the switching loss is reduced, and the efficiency is improved; under the condition that the voltage of the high-voltage input side of the converter is higher and the variation range is wider, the input end of the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter is connected in parallel with an interleaved parallel magnetic integrated bidirectional Buck/Boost converter, or under the condition that the voltage of the low-voltage output side of the converter is lower and the variation range is wider, the output end of the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter is connected in parallel with an interleaved parallel magnetic integrated bidirectional Buck/Boost converter, the withstand voltage of a power switch tube can be reduced, LLC resonant conversion is realized in the full load range, and Zero Voltage Switching (ZVS) of the power switch tube is realized. The magnetic integration technology realizes magnetic integration of a resonant transformer and a resonant inductor in the interleaved parallel bidirectional full-bridge LLC resonant converter, and reduces the volume and loss of the converter.
Drawings
FIG. 1 is a circuit topology of an interleaved parallel magnetically integrated bi-directional full-bridge LLC resonant converter according to an embodiment of the present invention;
FIG. 2 is a circuit topology diagram of an interleaved series-parallel magnetic integrated bi-directional full-bridge LLC resonant converter provided by a second embodiment of the present invention;
FIG. 3 is a circuit topology diagram of a composite interleaved parallel magnetic integrated bi-directional full-bridge LLC resonant converter provided by a third embodiment of the invention;
FIG. 4 is a circuit topology diagram of a composite interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter according to a fourth embodiment of the present invention;
FIG. 5 is a schematic diagram of a resonant transformer integrated magnetic component according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a resonant inductor integrated magnetic component according to an embodiment of the present invention;
Fig. 7 is a schematic structural diagram of an integrated magnetic component of a resonant transformer according to a second embodiment of the present invention;
Fig. 8 is a schematic structural diagram of a resonant inductor integrated magnetic component according to a second embodiment of the present invention;
Fig. 9 is a schematic structural diagram of a resonant transformer integrated magnetic component according to a third embodiment of the present invention;
fig. 10 is a schematic structural diagram of a resonant inductor integrated magnetic component according to a third embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a resonant transformer and a fully integrated magnetic component of a resonant inductor according to a fourth embodiment of the present invention;
fig. 12 is a schematic structural diagram of a resonant transformer and a fully integrated magnetic component of a resonant inductor according to a fifth embodiment of the present invention;
fig. 13 is a schematic structural diagram of a resonant transformer and a fully integrated magnetic component of resonant inductance according to a sixth embodiment of the present invention.
In the figure: 1. an iron core of an integrated magnetic part forming a resonant transformer T R1 and an excitation inductance L m1 and a resonant transformer T R2 and an excitation inductance L m2 thereof; 2. a core of the integrated magnetic element constituting the resonant inductances L 11 and L 21; 3. a core of the integrated magnetic element constituting the resonant inductances L 12 and L 22; 4. an E-shaped iron core; 5. an "I" shaped iron core; 6. a cross-shaped iron core; 7. a "[ -shaped iron core; 8. window of "EE" shaped core.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Embodiment one:
the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter comprises two paths of interleaved parallel LLC resonant converters, wherein the resonant transformers and resonant inductors in the two paths of interleaved parallel bidirectional full-bridge LLC resonant converters are respectively magnetically integrated by adopting integrated magnetic pieces as shown in figure 1; the first-path bidirectional full-bridge LLC resonant converter comprises a first primary circuit, a first secondary circuit, a resonant transformer T R1 and an excitation inductance L m1; the first primary circuit comprises a power switch tube S 11～S14, a resonant inductor L 11 and a resonant capacitor C 11; the first secondary circuit comprises a power switch tube S 15～S18, a resonant inductor L 12 and a resonant capacitor C 12; the second bidirectional full-bridge LLC resonant converter comprises a second primary circuit, a second secondary circuit and a resonant transformer T R2 and excitation inductance L m2 thereof; the second primary circuit comprises a power switch tube S 21～S24, a resonant inductor L 21 and a resonant capacitor C 21; the second secondary circuit comprises a power switch tube S 25～S28, a resonant inductor L 22 and a resonant capacitor C 22; the primary side circuit and the secondary side circuit of each bidirectional full-bridge LLC resonant converter adopt full-bridge LLC resonant circuits, so that bidirectional energy circulation is realized; the two paths of bidirectional full-bridge LLC resonant converters are connected in parallel in a staggered way, the input ends of the bidirectional full-bridge LLC resonant converters after the staggered parallel connection are connected with a high-voltage direct-current power supply V H, and the output ends of the bidirectional full-bridge LLC resonant converters are connected with a low-voltage direct-current power supply V L. The resonant transformer T R1 and its excitation inductance L m1 and the resonant transformer T R2 and its excitation inductance L m2 are integrated on the core 1, the resonant inductance L 11、L21 is integrated on the core 2 and the resonant inductance L 12、L22 is integrated on the core 3. Therefore, the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter is formed, and the interleaved control is carried out on the two paths of parallel bidirectional full-bridge LLC resonant converters. The staggered control refers to staggered control of the two-path full-bridge LLC resonant converter, namely, the phase difference of control signals of power switching tubes of the two-path LLC resonant converter is 90 degrees, or 1/4 period. The two-way staggered parallel magnetic integration bidirectional full-bridge LLC resonant converter of the embodiment can be expanded to three or more than three ways.
The integrated magnetic component for realizing the magnetic integration of the resonant transformers in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is the integrated magnetic component of the resonant transformers, and is used for the magnetic integration of the resonant transformers T R1 and the exciting inductance L m1 and the resonant transformers T R2 and the exciting inductance L m2 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter. The iron core of the integrated magnetic component of the resonant transformer, namely the iron core 1 of the integrated magnetic component of the resonant transformer T R1 and the exciting inductance L m1 thereof and the resonant transformer T R2 and the exciting inductance L m2 thereof shown in fig. 1, is of an EE-shaped iron core structure, and comprises two E-shaped iron cores 4 with opposite magnetic poles, wherein no air gap exists between the middle poles of the two E-shaped iron cores 4, and air gaps are arranged between the upper magnetic poles and between the lower magnetic poles. In the structure of the "EE" shaped iron core, N 11、N12 windings are wound on the upper magnetic leg of the two "E" shaped iron cores 4 respectively to form a resonant transformer T R1 and an excitation inductance L m1 thereof, and N 21、N22 windings are wound on the lower magnetic leg respectively to form a resonant transformer T R2 and an excitation inductance L m2 thereof.
The integrated magnetic component for realizing the magnetic integration of the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is the resonant inductor integrated magnetic component and is used for the magnetic integration of the resonant inductor L 11、L21 and the magnetic integration of the resonant inductor L 12、L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter. The core of the resonant inductor integrated magnetic element, that is, the core 2 of the integrated magnetic element of the resonant inductor L 11、L21 or the core 3 of the integrated magnetic element of the resonant inductor L 12、L22 shown in fig. 1 is of an "EI" shaped core structure, and as shown in fig. 6, includes one "E" shaped core 4 and one "I" shaped core 5, the "I" shaped core 5 being placed on the open side of the "E" shaped core 4, and air gaps being provided between the three magnetic legs of the "E" shaped core 4 and the "I" shaped core 5. The winding is wound on the upper side magnetic pole of the E-shaped iron core 4 of the resonant inductor integrated magnetic piece to form resonant inductor L 11 or L 12, and the winding is wound on the lower side magnetic pole to form resonant inductor L 21 or L 22.
In a specific implementation, the core 1 of the integrated magnetic component of the resonant transformer may also adopt an "EI" shaped core structure as shown in fig. 6, and the core 2 or 3 of the integrated magnetic component of the resonant inductor may also adopt an "EE" shaped core structure as shown in fig. 5.
Embodiment two:
As shown in FIG. 2, the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter further comprises two input capacitors C 1 and C 2 on the basis of FIG. 1, the input capacitors C 1 and C 2 are connected in series, the input capacitor C 1 after being connected in series is connected to two input ends of the first-path bidirectional full-bridge LLC resonant converter, and the input capacitor C 2 is connected to two input ends of the second-path bidirectional full-bridge LLC resonant converter; two input capacitors C 1 and C 2 connected with two paths of staggered parallel bidirectional full-bridge LLC resonant converters are connected at two ends of a high-voltage direct-current power supply V H, and output ends of the two paths of staggered parallel bidirectional full-bridge LLC resonant converters are connected at two ends of a low-voltage direct-current power supply V L. The resonant transformer T R1 and its excitation inductance L m1 and the resonant transformer T R2 and its excitation inductance L m2 are integrated on the core 1, the resonant inductance L 11、L21 is integrated on the core 2 and the resonant inductance L 12、L22 is integrated on the core 3. Thus, the interleaved serial-parallel magnetic integrated bidirectional full-bridge LLC resonant converter is formed.
The integrated magnetic component for realizing the magnetic integration of the resonant transformers in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is the integrated magnetic component of the resonant transformers, and is used for the magnetic integration of the resonant transformers T R1 and the exciting inductance L m1 and the resonant transformers T R2 and the exciting inductance L m2 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter. The core of the resonant transformer integrated magnetic part, that is, the core 1 of the resonant transformer T R1 and its exciting inductance L m1 and the resonant transformer T R2 and its exciting inductance L m2 shown in fig. 2, includes a piece of cross-shaped core 6 and two pieces of E-shaped core 4, as shown in fig. 7, the cross-shaped core 6 is placed between the two pieces of E-shaped core 4 with the two magnetic poles placed opposite to each other, and there is no air gap between the center pole of the two pieces of E-shaped core 4 and the left and right transverse yokes of the cross-shaped core. The upper side magnetic pole of the cross-shaped iron core 6 of the resonant transformer integrated magnetic component is wound with an N 11、N12 winding to form a resonant transformer T R1 and an exciting inductance L m1 thereof, and the lower side magnetic pole is wound with an N 21、N22 winding to form a resonant transformer T R2 and an exciting inductance L m2 thereof.
The integrated magnetic component for realizing the magnetic integration of the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is the resonant inductor integrated magnetic component and is used for the magnetic integration of the resonant inductor L 11、L21 and the magnetic integration of the resonant inductor L 12、L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter. The iron core of the resonant inductor integrated magnetic part, namely the iron core 2 of the integrated magnetic part of the resonant inductor L 11、L21 shown in fig. 2 or the iron core 3 of the integrated magnetic part of the resonant inductor L 12、L22 also comprises a cross-shaped iron core 6 and two E-shaped iron cores 4, wherein the cross-shaped iron core 6 is arranged between the E-shaped iron cores 4 with the two magnetic poles oppositely arranged, an air gap is arranged between the middle pole of the two E-shaped iron cores and the left and right transverse yokes of the cross-shaped iron cores, and an air gap is arranged between the upper or lower side magnetic pole of the two E-shaped iron cores and the upper or lower side magnetic pole of the cross-shaped iron cores. The upper side magnetic pole of the cross-shaped iron core 6 of the resonant inductor integrated magnetic component is wound with a winding to form a resonant inductor L 11 or L 12, and the lower side magnetic pole is wound with a winding to form a resonant inductor L 21 or L 22.
Embodiment III:
As shown in FIG. 3, the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter also comprises an intermediate capacitor C and two paths of interleaved parallel magnetic integrated bidirectional Buck/Boost converters on the basis of FIG. 1; the first path of bidirectional Buck/Boost converter comprises a power switch tube S 1、S2 and an inductor L 1, and the second path of bidirectional Buck/Boost converter comprises a power switch tube S 3、S4 and an inductor L 1; the inductor of the first path of bidirectional Buck/Boost converter and the inductor of the second path of bidirectional Buck/Boost converter are subjected to reverse magnetic coupling to form a magnetic integrated coupling inductor; the input ends of the two-way bidirectional Buck/Boost converters after the staggered parallel magnetic integration are connected to the two ends of the high-voltage direct-current power supply V H, the output ends of the two-way bidirectional full-bridge LLC resonant converters are connected to the middle capacitor C, the input ends of the two-way staggered parallel bidirectional full-bridge LLC resonant converters are connected to the two ends of the middle capacitor C, and the output ends of the two-way bidirectional full-bridge LLC resonant converters are connected to the two ends of the low-voltage direct-current power supply V L. The resonant transformer T R1 and its excitation inductance L m1 and the resonant transformer T R2 and its excitation inductance L m2 are integrated on the core 1, the resonant inductance L 11、L21 is integrated on the core 2 and the resonant inductance L 12、L22 is integrated on the core 3. Thus, the composite staggered serial-parallel magnetic integration bidirectional full-bridge LLC resonant converter is formed.
The integrated magnetic component for realizing the magnetic integration of the resonant transformers in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is the integrated magnetic component of the resonant transformers, and is used for the magnetic integration of the resonant transformers T R1 and the exciting inductance L m1 and the resonant transformers T R2 and the exciting inductance L m2 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter. The core of the resonant transformer integrated magnetic part, that is, the core 1 of the resonant transformer T R1 and its exciting inductance L m1 and the resonant transformer T R2 and its exciting inductance L m2 shown in fig. 3, as shown in fig. 9, includes a piece of "cross" core 6 and two pieces of "cross" core 7, the "cross" core 6 is placed between the two pieces of oppositely placed "[" core 7, there is no air gap between the middle part of the two pieces of "[" core 7 and the left and right lateral yokes of the "cross" core 6, and there is an air gap between the upper or lower side magnetic leg of the two pieces of "[" core 7 and the upper or lower side magnetic leg of the "cross" core 6. N 11、N12 windings are wound on the upper side magnetic columns of the cross-shaped iron core 6 of the resonant transformer integrated magnetic piece to form a resonant transformer T R1 and exciting inductance L m1 thereof, and N 21、N22 windings are wound on the lower side magnetic columns to form a resonant transformer T R2 and exciting inductance L m2 thereof;
the integrated magnetic component for realizing the magnetic integration of the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is the resonant inductor integrated magnetic component and is used for the magnetic integration of the resonant inductor L 11、L21 and the magnetic integration of the resonant inductor L 12、L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter. The core of the resonant inductor integrated magnetic part, that is, the core 2 of the integrated magnetic part of the resonant inductor L 11、L21 shown in fig. 3 or the core 3 of the integrated magnetic part of the resonant inductor L 12、L22, as shown in fig. 10, also includes a piece of cross-shaped core 6 and two pieces of cross-shaped core 7, the cross-shaped core 6 is placed between the two pieces of oppositely placed cross-shaped cores 7, an air gap is formed between the middle part of the two pieces of cross-shaped cores and the left and right transverse yokes of the cross-shaped core, and an air gap is formed between the upper or lower side magnetic leg of the two pieces of cross-shaped core 7 and the upper or lower side magnetic leg of the cross-shaped core 6. The upper pole of the cross-shaped iron core 6 of the resonant inductor integrated magnetic piece is wound with a winding to form a resonant inductor L 11 or L 12, and the lower pole is wound with a winding to form a resonant inductor L 21 or L 22.
Embodiment four:
As shown in FIG. 4, the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter further comprises an intermediate capacitor C and two paths of interleaved parallel magnetic integrated bidirectional Buck/Boost converters on the basis of FIG. 1; the first path of bidirectional Buck/Boost converter comprises a power switch tube S 1、S2 and an inductor L 1, and the second path of bidirectional Buck/Boost converter comprises a power switch tube S 3、S4 and an inductor L 1; the inductor of the first path of bidirectional Buck/Boost converter and the inductor of the second path of bidirectional Buck/Boost converter are subjected to reverse magnetic coupling to form a magnetic integrated coupling inductor; the input ends of the two-way bidirectional Buck/Boost converters after being connected in parallel in a staggered way are connected with the middle capacitor C in parallel, the output ends of the two-way bidirectional full-bridge LLC resonant converters after being connected in parallel in a staggered way are connected with the two ends of the middle capacitor C, and the input ends of the two-way bidirectional full-bridge LLC resonant converters are connected with the two ends of the high-voltage direct-current power supply V H. The resonant transformer T R1 and its excitation inductance L m1 and the resonant transformer T R2 and its excitation inductance L m2 are integrated on the core 1, the resonant inductance L 11、L21 is integrated on the core 2 and the resonant inductance L 12、L22 is integrated on the core 3. Thus, another composite type staggered serial-parallel magnetic integration bidirectional full-bridge LLC resonant converter is formed.
The integrated magnetic component for realizing the magnetic integration of the resonant transformer and the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a staggered parallel full-integrated magnetic component and is used for the magnetic integration of the resonant transformer T R1 and the excitation inductor L m1 thereof, the resonant transformer T R2 and the excitation inductor L m2 thereof and the four resonant inductors L 11、L12、L21、L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter. The iron cores of the staggered parallel full-integrated magnetic piece are shown in fig. 11, and comprise two E-shaped iron cores 4 and two I-shaped iron cores 5, wherein the magnetic columns of the two E-shaped iron cores 4 are oppositely arranged to form an EE-shaped iron core structure, no air gap is arranged between the middle columns of the two E-shaped iron cores 4, and air gaps are arranged between the upper magnetic columns and between the lower magnetic columns; two I-shaped iron cores 5 are respectively vertically arranged between the upper window 8 and the lower window 8 of the EE-shaped iron core structure. The two "E" shaped iron cores 4 constitute the iron core 1 of the integrated magnetic part of the resonant transformer T R1 and the exciting inductance L m1 thereof and the resonant transformer T R2 and the exciting inductance L m2 thereof shown in fig. 4, and the two "I" shaped iron cores 5 constitute the iron core 2 of the integrated magnetic part of the resonant inductance L 11、L21 and the iron core 3 of the integrated magnetic part of the resonant inductance L 12、L22 shown in fig. 4, respectively. N 11、N12 windings are wound on the upper side magnetic columns of the two E-shaped iron cores 4 of the EE-shaped iron core structure respectively to form a resonant transformer T R1 and an exciting inductance L m1 thereof, N 21、N22 windings are wound on the lower side magnetic columns respectively to form a resonant transformer T R2 and an exciting inductance L m2.N11 and an exciting inductance L 12 of the resonant transformer or magnetic fields generated by N 21 and N 22 cannot all pass through each other, and a part of the magnetic fields respectively return through the I-shaped iron cores 5 placed in the upper window 8 or the lower window 8 of the EE-shaped iron core structure to form leakage magnetic fluxesAnd/>Or leakage flux/>And/>Leakage inductance is formed as the resonance inductance, and resonance inductance L 11、L12 or resonance inductance L 12、L22 is formed, respectively.
Fifth embodiment:
The interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter comprises two paths of interleaved parallel LLC resonant converters, wherein a resonant transformer and a resonant inductor in the two paths of interleaved parallel bidirectional full-bridge LLC resonant converters are magnetically integrated by adopting an integrated magnetic piece as shown in figure 1; the integrated magnetic component for realizing the magnetic integration of the resonant transformer and the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a staggered parallel full-integrated magnetic component and is used for the magnetic integration of the resonant transformer T R1 and the excitation inductor L m1, the resonant transformer T R2 and the excitation inductor L m2 thereof and the four resonant inductors L 11、L12、L21、L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter; other structures are the same as the first embodiment.
The iron core of the staggered parallel full integrated magnetic piece, as shown in fig. 12, comprises two E-shaped iron cores 4-1 and two E-shaped iron cores 4-2. The two "E" shaped iron cores 4-1 constitute the iron core 1 of the integrated magnetic part of the resonant transformer T R1 and its excitation inductance L m1 and the resonant transformer T R2 and its excitation inductance L m2 shown in fig. 1, and the two "E" shaped iron cores 4-2 constitute the iron core 2 of the integrated magnetic part of the resonant inductance L 11、L21 and the iron core 3 of the integrated magnetic part of the resonant inductance L 12、L22 shown in fig. 1, respectively. The magnetic columns of the two E-shaped iron cores 4-1 are oppositely arranged to form an EE-shaped iron core structure, no air gap exists between the middle columns of the two E-shaped iron cores 4-1, and air gaps are arranged between the upper side magnetic columns and between the lower side magnetic columns; n 11、N12 windings are respectively wound on the upper magnetic columns of the two E-shaped iron cores 4-1 of the EE-shaped iron core structure to form a resonant transformer T R1 and an excitation inductance L m1 thereof, and N 21、N22 windings are respectively wound on the lower magnetic columns to form a resonant transformer T R2 and an excitation inductance L m2 thereof. The opening direction of one E-shaped iron core 4-2 is placed towards one side of the winding N 11、N12 of the EE-shaped iron core, and an air gap is arranged between three magnetic columns of the E-shaped iron core 4-2 and the upper magnetic columns of the two E-shaped iron cores 4-1 of the EE-shaped iron core structure; the magnetic fields generated by the windings N 11 and N 12 cannot pass through each other completely, and a part of the magnetic fields return through the upper E-shaped iron core 4-2 to form leakage magnetic fluxAnd/>So that leakage inductance is formed as resonance inductance, and resonance inductance L 11、L12 is formed respectively; the opening direction of the other E-shaped iron core 4-2 is arranged towards one side of the winding N 21、N22 of the EE-shaped iron core, and an air gap is arranged between the three magnetic columns of the E-shaped iron core 4-2 and the lower magnetic columns of the two E-shaped iron cores 4-1 of the EE-shaped iron core structure; the magnetic fields generated by the windings N 21 and N 22 cannot pass through each other completely, and a part of the magnetic fields return through the lower E-shaped iron core 4-2 to form leakage magnetic flux/>And/>The leakage inductance is formed as a resonance inductance and the resonance inductances L 21、L22 are formed, respectively.
Example six:
The interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter also comprises two input capacitors C 1、C2 connected in series and two paths of interleaved parallel LLC resonant converters, wherein the resonant transformers and resonant inductors in the two paths of interleaved parallel bidirectional full-bridge LLC resonant converters adopt integrated magnetic pieces to realize magnetic integration as shown in figure 2; the integrated magnetic component for realizing the magnetic integration of the resonant transformer and the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a staggered parallel full-integrated magnetic component and is used for the magnetic integration of the resonant transformer T R1 and the excitation inductor L m1, the resonant transformer T R2 and the excitation inductor L m2 thereof and the four resonant inductors L 11、L12、L21、L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter; other structures are the same as in the second embodiment.
The iron cores of the staggered parallel full-integrated magnetic pieces are shown in fig. 13, and comprise three groups of EE-shaped iron cores which are sequentially arranged front and back, wherein two E-shaped iron cores in each group of EE-shaped iron cores are placed up and down, and air gaps are arranged among three magnetic columns of the two E-shaped iron cores placed up and down; the three groups of EE-shaped iron cores are sequentially a first group of EE-shaped iron cores, a second group of EE-shaped iron cores and a third group of EE-shaped iron cores from front to back. The second set of cores constitutes core 1 of the integrated magnetic part of resonant transformer T R1、TR2 shown in fig. 1, the first set of cores constitutes core 2 of the integrated magnetic part of resonant inductance L 11、L21 shown in fig. 1, and the third set of cores constitutes core 3 of the integrated magnetic part of resonant inductance L 12、L22 shown in fig. 1. N 11 windings are wound on the same side magnetic columns of the upper sheet iron core 4-3 of the first group iron core and the upper sheet iron core 4-4 of the second group iron core, N 12 windings are wound on the same side magnetic columns of the lower sheet iron core 4-4 of the second group iron core and the lower sheet iron core 4-5 of the third group iron core, N 11 windings and N 12 windings are positioned on the same side, N 11 windings on the upper sheet iron core 4-4 of the second group 'EE' iron core and N 12 windings on the lower sheet iron core 4-4 form a resonant transformer T R1 and exciting inductance L m1 thereof, N 11 windings on the upper sheet iron core 4-3 of the first group 'EE' iron core form a resonant inductance L 11, and N 12 windings on the lower sheet iron core 4-5 of the third group 'EE' iron core form a resonant inductance L 12; n 21 windings are wound on the other side magnetic columns of the upper sheet iron core 4-3 of the first group iron core and the upper sheet iron core 4-4 of the second group iron core, N 22 windings are wound on the other side magnetic columns of the lower sheet iron core 4-4 of the second group iron core and the lower sheet iron core 4-5 of the third group iron core, N 21 windings and N 22 windings are positioned on the same side, the N 21 windings on the upper sheet iron core 4-4 of the second group 'EE' iron core and the N 22 windings on the lower sheet iron core 4-4 form a resonant transformer T R2 and excitation inductance L m2 thereof, the N 21 windings on the upper sheet iron core 4-3 of the first group 'EE' iron core form a resonant inductance L 21, and the N 22 windings on the lower sheet iron core 4-5 of the third group 'EE' iron core form a resonant inductance L 22.
In a specific implementation, the integrated magnetic components in the above embodiments are not limited to the embodiments to which they are applied, and may be applied to the magnetic integration of the resonant transformer and the resonant inductor in the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter in other embodiments. The E-shaped iron core, the I-shaped iron core, the cross-shaped iron core and the cross-shaped iron core of each integrated magnetic piece are made of magnetic materials such as ferrite, silicon steel sheets, ferrosilicon, metal magnetic powder cores, amorphous, ultracrystalline and the like, and the N 11、N12、N21、N22 winding forming the resonant transformer and the winding forming the resonant inductor L 11、L12、L21、L22 are made of copper wires, copper foils, aluminum wires or aluminum foils which are covered with insulating layers.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions, which are defined by the scope of the appended claims.

Claims (9)

1. The utility model provides a two-way full-bridge LLC resonant converter of alternate parallelly connected magnetism integration which characterized in that: the magnetic integration device comprises two paths of interleaved parallel bidirectional full-bridge LLC resonant converters, wherein a resonant transformer and a resonant inductor in the two paths of interleaved parallel bidirectional full-bridge LLC resonant converters adopt an integrated magnetic piece to realize the magnetic integration; the first-path bidirectional full-bridge LLC resonant converter comprises a first primary circuit, a first secondary circuit, a resonant transformer TR1 and an excitation inductance Lm1; the first primary circuit comprises power switching tubes S11-S14, a resonant inductor L11 and a resonant capacitor C11; the first secondary circuit comprises power switching tubes S15-S18, a resonant inductor L12 and a resonant capacitor C12; the second bidirectional full-bridge LLC resonant converter comprises a second primary circuit, a second secondary circuit and a resonant transformer TR2 and excitation inductance Lm2 thereof; the second primary circuit comprises power switching tubes S21-S24, a resonant inductor L21 and a resonant capacitor C21; the second secondary circuit comprises power switching tubes S25-S28, a resonant inductor L22 and a resonant capacitor C22; the primary side circuit and the secondary side circuit of each bidirectional full-bridge LLC resonant converter adopt full-bridge LLC resonant circuits, so that bidirectional energy circulation is realized;
the integrated magnetic component for realizing the magnetic integration of the resonant transformers in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a resonant transformer integrated magnetic component and is used for the magnetic integration of the resonant transformer TR1, the exciting inductance Lm1 and the resonant transformer TR2 and the exciting inductance Lm2 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter; the integrated magnetic part for realizing the magnetic integration of the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter is a resonant inductor integrated magnetic part and is used for the magnetic integration of the resonant inductors L11 and L21 and the magnetic integration of the resonant inductors L12 and L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter;
The iron core of the integrated magnetic part of the resonance transformer is of an EE-shaped iron core structure and comprises two E-shaped iron cores with opposite magnetic columns, wherein an air gap is not reserved between middle columns of the two E-shaped iron cores, and air gaps are reserved between upper magnetic columns and lower magnetic columns; in the structure of the EE-shaped iron core, windings N11 and N12 are respectively wound on upper magnetic columns of two E-shaped iron cores to form a resonant transformer TR1 and excitation inductance Lm1 thereof, and windings N21 and N22 are respectively wound on lower magnetic columns to form a resonant transformer TR2 and excitation inductance Lm2 thereof;
The iron core of the resonant inductor integrated magnetic piece is of an EI-shaped iron core structure and comprises an E-shaped iron core and an I-shaped iron core, wherein the I-shaped iron core is arranged on the opening side of the E-shaped iron core, and air gaps are arranged between three magnetic columns of the E-shaped iron core and the I-shaped iron core; windings are wound on the upper side magnetic column of the E-shaped iron core of the resonant inductor integrated magnetic piece to form resonant inductors L11 or L12, and windings are wound on the lower side magnetic column to form resonant inductors L21 or L22.
2. The interleaved parallel magnetically integrated bi-directional full-bridge LLC resonant converter of claim 1 wherein: the staggered parallel magnetic integrated bidirectional full-bridge LLC resonant converter further comprises two input capacitors C1 and C2, the input capacitors C1 and C2 are connected in series, the input capacitor C1 after being connected in series is connected to two input ends of the first path of bidirectional full-bridge LLC resonant converter, and the input capacitor C2 is connected to two input ends of the second path of bidirectional full-bridge LLC resonant converter.
3. The interleaved parallel magnetically integrated bi-directional full-bridge LLC resonant converter of claim 1 wherein: the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter further comprises an intermediate capacitor C and two paths of interleaved parallel magnetic integrated bidirectional Buck/Boost converters; the inductor L1 of the first path of bidirectional Buck/Boost converter and the inductor L2 of the second path of bidirectional Buck/Boost converter are subjected to reverse magnetic coupling to form a magnetic integration coupling inductor; the output end of the two-way Buck/Boost converter after staggered parallel connection is connected with the middle capacitor C in parallel, and the input ends of the two-way staggered parallel connection two-way full-bridge LLC resonant converter are connected at the two ends of the middle capacitor C.
4. The interleaved parallel magnetically integrated bi-directional full-bridge LLC resonant converter of claim 1 wherein: the interleaved parallel magnetic integrated bidirectional full-bridge LLC resonant converter further comprises an intermediate capacitor C and two paths of interleaved parallel magnetic integrated bidirectional Buck/Boost converters; the inductor L1 of the first path of bidirectional Buck/Boost converter and the inductor L2 of the second path of bidirectional Buck/Boost converter are subjected to reverse magnetic coupling to form a magnetic integration coupling inductor; the input end of the two-way Buck/Boost converter after staggered parallel connection is connected with the middle capacitor C in parallel, and the output ends of the two-way staggered parallel connection two-way full-bridge LLC resonant converter are connected at two ends of the middle capacitor C.
5. The interleaved parallel magnetically integrated bi-directional full-bridge LLC resonant converter of claim 1 wherein: the iron core of the resonant transformer integrated magnetic piece and the iron core of the resonant inductance integrated magnetic piece can also adopt an iron core structure comprising a cross-shaped iron core and two E-shaped iron cores, wherein the cross-shaped iron core is arranged between the two E-shaped iron cores with opposite magnetic columns;
an air gap is not reserved between the middle columns of the two E-shaped iron cores of the resonant transformer integrated magnetic piece and the left and right transverse yokes of the cross-shaped iron core of the resonant transformer integrated magnetic piece, and an air gap is reserved between the upper or lower side magnetic columns of the two E-shaped iron cores of the resonant transformer integrated magnetic piece and the upper or lower side magnetic columns of the cross-shaped iron cores of the resonant transformer integrated magnetic piece; n11 and N12 windings are respectively wound on the upper side magnetic columns of the cross-shaped iron core of the resonant transformer integrated magnetic piece to form a resonant transformer TR1 and an excitation inductance Lm1 thereof, and N21 and N22 windings are respectively wound on the lower side magnetic columns to form a resonant transformer TR2 and an excitation inductance Lm2 thereof;
an air gap is arranged between the middle columns of the two E-shaped iron cores of the resonant inductor integrated magnetic piece and the left and right transverse yokes of the cross-shaped iron core of the resonant inductor integrated magnetic piece, and an air gap is arranged between the upper or lower side magnetic columns of the two E-shaped iron cores of the resonant inductor integrated magnetic piece and the upper or lower side magnetic columns of the cross-shaped iron cores of the resonant inductor integrated magnetic piece; windings are wound on the upper side magnetic columns of the cross-shaped iron core of the resonant inductor integrated magnetic piece to form resonant inductors L11 or L12, and windings are wound on the lower side magnetic columns to form resonant inductors L21 or L22.
6. The interleaved parallel magnetically integrated bi-directional full-bridge LLC resonant converter of claim 1 wherein:
The iron core of the resonant transformer integrated magnetic piece and the iron core of the resonant inductance integrated magnetic piece can also adopt an iron core structure comprising a cross-shaped iron core and two cross-shaped iron cores, wherein the cross-shaped iron core is arranged between the two cross-shaped iron cores with opposite openings;
an air gap is not reserved between the middle parts of the two [ -shaped iron cores of the resonant transformer integrated magnetic piece and the left and right transverse yokes of the [ -shaped iron core of the resonant transformer integrated magnetic piece, and an air gap is reserved between the upper or lower side magnetic column of the [ -shaped iron core of the resonant transformer integrated magnetic piece and the upper or lower side magnetic column of the [ -shaped iron core of the resonant transformer integrated magnetic piece; winding N11 and N12 windings on an upper magnetic column of a cross-shaped iron core of the resonant transformer integrated magnetic piece to form a resonant transformer TR1 and excitation inductance Lm1 thereof, and winding N21 and N22 windings on a lower magnetic column to form a resonant transformer TR2 and excitation inductance Lm2 thereof;
An air gap is arranged between the middle part of the two iron cores of the resonant inductor integrated magnetic part and the left and right transverse yokes of the cross iron core of the resonant inductor integrated magnetic part, and an air gap is arranged between the upper or lower magnetic column of the iron cores of the resonant inductor integrated magnetic part and the upper or lower magnetic column of the cross iron core of the resonant inductor integrated magnetic part; windings are wound on the upper side magnetic columns of the cross-shaped iron core of the resonant inductor integrated magnetic piece to form resonant inductors L11 or L12, and windings are wound on the lower side magnetic columns to form resonant inductors L21 or L22.
7. The interleaved parallel magnetically integrated bi-directional full-bridge LLC resonant converter of claim 1 wherein:
The integrated magnetic component for realizing the magnetic integration of the resonant transformer and the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter can also be a staggered parallel full-integrated magnetic component, and is used for the magnetic integration of the resonant transformer TR1 and the excitation inductor Lm1 thereof, the resonant transformer TR2 and the excitation inductor Lm2 thereof and the four resonant inductors L11, L12, L21 and L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter;
The iron core of the staggered parallel full-integrated magnetic piece comprises two E-shaped iron cores and two I-shaped iron cores, the magnetic columns of the two E-shaped iron cores are oppositely arranged to form an EE-shaped iron core structure, no air gap is arranged between the middle columns of the two E-shaped iron cores, and air gaps are arranged between the upper side magnetic columns and the lower side magnetic columns; two I-shaped iron cores are respectively vertically arranged between an upper window and a lower window of the EE-shaped iron core structure; n11 and N12 windings are respectively wound on the upper magnetic columns of the two E-shaped iron cores of the EE-shaped iron core structure to form a resonant transformer TR1 and an excitation inductance Lm1 thereof, and N21 and N22 windings are respectively wound on the lower magnetic columns to form a resonant transformer TR2 and an excitation inductance Lm2 thereof; the magnetic fields generated by the windings N11 and N12 or the windings N21 and N22 cannot all pass through each other, and a part of the magnetic fields respectively return through an I-shaped iron core arranged in an upper window or a lower window of the EE-shaped iron core structure to form leakage magnetic flux and/or leakage magnetic flux and respectively form leakage inductance as resonance inductance to form resonance inductances L11 and L12 or resonance inductances L21 and L22 respectively.
8. The interleaved parallel magnetically integrated bi-directional full-bridge LLC resonant converter of claim 1 wherein:
The integrated magnetic component for realizing the magnetic integration of the resonant transformer and the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter can also be a staggered parallel full-integrated magnetic component, and is used for the magnetic integration of the resonant transformer TR1 and the excitation inductor Lm1 thereof, the resonant transformer TR2 and the excitation inductor Lm2 thereof and the four resonant inductors L11, L12, L21 and L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter;
The iron core of the staggered parallel full-integrated magnetic piece comprises four E-shaped iron cores, wherein the magnetic columns of the two E-shaped iron cores are oppositely arranged to form an EE-shaped iron core structure, no air gap exists between the middle columns of the two E-shaped iron cores, and air gaps are arranged between the upper side magnetic columns and between the lower side magnetic columns; n11 and N12 windings are respectively wound on the upper magnetic columns of the two E-shaped iron cores of the EE-shaped iron core structure to form a resonant transformer TR1 and an excitation inductance Lm1 thereof, and N21 and N22 windings are respectively wound on the lower magnetic columns to form a resonant transformer TR2 and an excitation inductance Lm2 thereof; the opening direction of the third E-shaped iron core is arranged towards one side of the winding N11 and N12 of the EE-shaped iron core, and an air gap is arranged between three magnetic columns of the E-shaped iron core and the upper magnetic columns of the two E-shaped iron cores of the EE-shaped iron core; the magnetic fields generated by the N11 winding and the N12 winding cannot all pass through each other, and a part of the magnetic fields return through the magnetic columns of the third E-shaped iron core to form leakage magnetic flux and leakage inductance as resonance inductance, so as to form resonance inductances L11 and L12 respectively; the opening direction of the fourth E-shaped iron core is arranged towards one side of the winding N21 and N22 of the EE-shaped iron core, and an air gap is arranged between three magnetic columns of the E-shaped iron core and the lower magnetic columns of the two E-shaped iron cores of the EE-shaped iron core; the magnetic fields generated by the N21 winding and the N22 winding cannot all pass through each other, and a part of the magnetic fields return through the magnetic columns of the fourth E-shaped iron core to form leakage magnetic flux and leakage inductance as resonance inductance, so as to form resonance inductances L21 and L22 respectively.
9. The interleaved parallel magnetically integrated bi-directional full-bridge LLC resonant converter of claim 1 wherein:
The integrated magnetic component for realizing the magnetic integration of the resonant transformer and the resonant inductor in the two-way staggered parallel bidirectional full-bridge LLC resonant converter can also be a staggered parallel full-integrated magnetic component, and is used for the magnetic integration of the resonant transformer TR1 and the excitation inductor Lm1 thereof, the resonant transformer TR2 and the excitation inductor Lm2 thereof and the four resonant inductors L11, L12, L21 and L22 in the two-way staggered parallel bidirectional full-bridge LLC resonant converter;
The iron cores of the staggered parallel full-integrated magnetic piece comprise three groups of EE-shaped iron cores which are sequentially arranged front and back, two E-shaped iron cores in each group of EE-shaped iron cores are placed up and down, and air gaps are arranged among three magnetic columns of the two E-shaped iron cores placed up and down; the three groups of EE-shaped iron cores are sequentially a first group of EE-shaped iron cores, a second group of EE-shaped iron cores and a third group of EE-shaped iron cores from front to back; the upper sheet iron cores of the first group of EE iron cores and the upper sheet iron cores of the second group of EE iron cores are wound with N11 windings together on the same side magnetic column, the lower sheet iron cores of the second group of EE iron cores and the lower sheet iron cores of the third group of EE iron cores are wound with N12 windings together on the same side, the N11 windings and the N12 windings on the upper sheet iron cores of the second group of EE iron cores and the N12 windings on the lower sheet iron cores form a resonant transformer TR1 and excitation inductance Lm1 thereof, the N11 windings on the upper sheet iron cores of the first group of EE iron cores form a resonant inductance L11, and the N12 windings on the lower sheet iron cores of the third group of EE iron cores form a resonant inductance L12; the upper sheet iron core of the first group of EE iron cores and the other side magnetic column of the upper sheet iron core of the second group of EE iron cores are wound with N21 windings together, the lower sheet iron core of the second group of EE iron cores and the other side magnetic column of the lower sheet iron core of the third group of EE iron cores are wound with N22 windings together, the N21 windings and the N22 windings are positioned on the same side, the N21 windings on the upper sheet iron core and the N22 windings on the lower sheet iron core of the second group of EE iron cores form a resonant transformer TR2 and excitation inductance Lm2 thereof, the N21 windings on the upper sheet iron core of the first group of EE iron cores form a resonant inductance L21, and the N22 windings on the lower sheet iron core of the third group of EE iron cores form a resonant inductance L22.
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