CN112751489B - Magnetic integration staggered parallel LLC resonant converter - Google Patents
Magnetic integration staggered parallel LLC resonant converter Download PDFInfo
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- CN112751489B CN112751489B CN202110061092.4A CN202110061092A CN112751489B CN 112751489 B CN112751489 B CN 112751489B CN 202110061092 A CN202110061092 A CN 202110061092A CN 112751489 B CN112751489 B CN 112751489B
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- 230000010354 integration Effects 0.000 title claims abstract description 56
- 239000003990 capacitor Substances 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000005284 excitation Effects 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 128
- 208000037516 chromosome inversion disease Diseases 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 4
- 230000010363 phase shift Effects 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 3
- 230000004907 flux Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/285—Single converters with a plurality of output stages connected in parallel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a magnetic integration staggered parallel LLC resonant converter. The method is characterized by comprising the following steps: the primary side DC power supply, the input filter capacitor, the primary side inverter bridge, the output filter capacitor and the output load; the first phase full-bridge LLC resonant converter comprises a first primary inverter bridge, a first resonant capacitor, a resonant inductor, a transformer and a first secondary rectifier bridge, and the second phase full-bridge LLC resonant converter comprises a second primary inverter bridge, a second resonant capacitor, a resonant inductor, a transformer and a second secondary rectifier bridge; the first magnetic core of the magnetic integrated structure integrates the resonant inductance of the two-phase full-bridge LLC resonant converter, the second magnetic core of the magnetic integrated structure integrates the transformer of the two-phase full-bridge LLC resonant converter and the excitation inductance thereof, and the whole converter only comprises two magnetic elements, so that the weight and the volume of the magnetic elements are effectively reduced, the practical design and the application are convenient, and the power density of the converter is improved.
Description
Technical Field
The invention relates to a power electronic magnetic integration technology, in particular to a magnetic integration staggered parallel LLC resonant converter.
Background
In recent years, small-sized, light-weight, high-efficiency and high-power-density converters are continuously pursued, and because LLC resonant converters can realize the excellent characteristics of soft switching in a full load range, their applications in various fields such as production and life are continuously expanding, but with the development, new challenges are also presented to their capacity. The interleaved parallel technology is introduced into the LLC resonant converter, so that the capacity of the converter can be increased, and the voltage and current stress of each element in each phase of the channel can be effectively reduced within a certain output power range, so that the flexibility of device type selection is improved. However, the number of magnetic elements is increased, the resonant inductance and the transformer are designed, the volume and weight of the transformer are increased, and the magnetic elements are used as core components in the transformer, the volume and weight of the magnetic elements occupy a very high proportion in the whole transformer system, and have important influence on the operation reliability and efficiency, so the magnetic elements become main factors for limiting the improvement of the power density of the transformer. By introducing the magnetic integration technology, the volume and the weight of the magnetic element can be effectively reduced, the output current ripple wave is reduced, the dynamic performance of the converter is improved, and the power density of the converter is improved.
In the actual design of the prior art, the integration level of the interleaved parallel LLC resonant converter is not high, only the integration between two-phase resonant inductors is realized, and the transformer is mostly made of discrete devices, which is not beneficial to the improvement of power density.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a magnetic integrated interleaved parallel LLC resonant converter so as to realize the interleaved parallel operation of a full-bridge LLC resonant converter and the integrated design of magnetic elements after the interleaved parallel connection, thereby improving the output power, reducing the volume of the converter and improving the power density of the converter.
The invention provides a magnetic integrated interleaved parallel LLC resonant converter, comprising: primary side DC power supply V in Input filter capacitor C in The first primary side inverter bridge, the second primary side inverter bridge, resonance and voltage conversion, the first secondary side rectifier bridge, the second secondary side rectifier bridge and the output filter capacitor C 0 Output load R 0 The method comprises the steps of carrying out a first treatment on the surface of the The first primary inverter bridge is connected with the second primary inverter bridge, the resonance and the voltage conversion, the second primary inverter bridge, the resonance and the voltage conversion are respectively connected with the first primary inverter bridge, the second primary inverter bridge, the first secondary rectifier bridge and the second secondary rectifier bridge, and the first secondary rectifier bridge, the second secondary rectifier bridge and the output filter capacitor C 0 Output load R 0 The first primary inverter bridge and the second primary inverter bridge are connected with a primary DC power supply V respectively in Input filter capacitor C in Connecting; the resonance and voltage change consists of a first magnetic integration structure and a second magnetic integration structure, wherein the first magnetic integration structure integrates the resonance inductance of the two-phase full-bridge LLC resonance converter in one magnetic core, and the second magnetic integration structure integrates the transformer of the two-phase full-bridge LLC resonance converter and the excitation inductance of the transformer;
the first primary inverter bridge comprises a switching device Q 1 Switching device Q 2 Switching device Q 3 Switching device Q 4 Switching device Q 1 Source and switch device Q 2 Is connected with the drain electrode of the switching device Q 3 Source and switch device Q 4 Is connected with the drain electrode of the switching device Q 1 Drain-to-switch device Q 3 Is connected with the drain electrode of the switching device Q 2 Source and switch device Q 4 The source electrode of the transistor is connected; the second primary inverter bridge comprises a switching device Q 5 Switching device Q 6 Switching device Q 7 Switching device Q 8 Switching device Q 5 Source and switch device Q 6 Is connected with the drain electrode of the switching device Q 7 Source and switch device Q 8 Is connected with the drain electrode of the switching device Q 5 Drain-to-switch device Q 7 Is connected with the drain electrode of the switching device Q 6 Source and switch device Q 8 The source electrode of the transistor is connected; switching device Q in the first primary inverter bridge 1 Drain of (d) switching device Q 3 Is connected with the drain electrode of the switching device Q in the second primary side inversion bridge 5 Drain of (d) switching device Q 7 Is connected to form a node (1), and a switching device Q in the first primary inverter bridge 2 Source of (d) switching device Q 4 Switching device Q in the bridge with the source electrode of the second primary side inversion 6 Source of (d) switching device Q 8 Form a node (2) with the source electrode of the transistor; the resonance and voltage transformation comprises a first resonance capacitor C r1 A second resonance capacitor C r2 A first magnetic integrated structure and a second magnetic integrated structure; the first secondary side rectifier bridge comprises a rectifier diode D r1 Rectifier diode D r2 Rectifier diode D r3 Rectifier diode D r4 Rectifier diode D r1 Anode co-rectifying diode D of (C) r2 A rectifying diode D connected with the cathode of the capacitor r3 Anode co-rectifying diode D of (C) r4 A rectifying diode D connected with the cathode of the capacitor r1 Cathode co-rectifying diode D r3 A rectifying diode D connected with the cathode of the capacitor r2 Anode co-rectifying diode D of (C) r4 Is connected with the anode of the battery; the second secondary rectifier bridge comprises a rectifier diode D r5 Rectifier diode D r6 Rectifier diode D r7 Rectifier diode D r8 Rectifier diode D r5 Anode co-rectifying diode D of (C) r6 A rectifying diode D connected with the cathode of the capacitor r7 Anode co-rectifying diode D of (C) r8 A rectifying diode D connected with the cathode of the capacitor r5 Cathode co-rectifying diode D r7 A rectifying diode D connected with the cathode of the capacitor r6 Anode co-rectifying diode D of (C) r8 Is connected with the anode of the battery; rectifier diode D in the first secondary rectifier bridge r1 Cathode of rectifier diode D r3 Rectifier diode D in rectifier bridge with second secondary side r5 Cathode of rectifier diode D r7 The cathodes of the first secondary side rectifier bridge are connected to form a node (3), and a rectifier diode D in the first secondary side rectifier bridge r2 Anode of rectifier diode D r4 Rectifier diode D in rectifier bridge with anode and second secondary side r6 Anode of rectifier diode D r8 Is connected to form a node (4); the input filter capacitor C in Is connected with the node (1) and the node (2); the output filter capacitor C 0 Is connected with the node (3) and the node (4); the primary side direct current power supply V in Same-input filter capacitor C in Is connected with each other; the output load R 0 Same output filter capacitor C 0 Is connected with each other; the first port 1 'of the magnetic integration structure is connected with the first primary inversion bridge port A, the first port 3' of the magnetic integration structure is connected with the second port 1 of the magnetic integration structure, and the second port 2 of the magnetic integration structure is connected with the first resonant capacitor C r1 The magnetic integration structure two ports 3 and 4 are connected with the first primary side rectifier bridge port D and the second primary side rectifier bridge port C and the second primary side inverter bridge port B respectivelyThe first port 2 'is connected with the second primary inversion bridge port E, the first port 4' is connected with the second port 5, and the second port 6 is connected with the second resonant capacitor C r2 And then the magnetic integrated structure two ports 7 are connected with the second secondary rectifying bridge port G, and the magnetic integrated structure two ports 8 are connected with the second secondary rectifying bridge port H.
Optionally, the first phase full-bridge LLC resonant converter includes a first primary inverter bridge, a first resonant capacitor, a resonant inductor, a transformer, and a first secondary rectifier bridge, the second phase full-bridge LLC resonant converter includes a second primary inverter bridge, a second resonant capacitor, a resonant inductor, a transformer, and a second secondary rectifier bridge, and the two phase full-bridge LLC resonant converter adopts a connection mode in which input ends are connected in parallel and output ends are connected in parallel.
Optionally, the magnetic integrated structure one comprises a UIU magnetic core, a first resonant inductor winding L r1 First winding L of second resonant inductor r21 Second winding L of second resonant inductor r22 The method comprises the steps of carrying out a first treatment on the surface of the The first resonant inductance winding L r1 A first winding L of a second resonant inductor wound around the core jamb I r21 A second winding L of a second resonant inductor wound around the center post III of the magnetic core r22 Winding on the side column II of the magnetic core; wherein the first resonant inductor winding L r1 One end is used as a port 1' of the first magnetic integrated structure, and the first resonant inductance winding L r1 The other end is used as a port 3' of the first magnetic integrated structure, and the first winding L of the second resonant inductor r21 One end is used as a port 2' of the first magnetic integrated structure, and the second resonant inductor is provided with a first winding L r21 The other end is connected with a second winding L of a second resonant inductor r22 Is connected with a second winding L of a second resonant inductor r22 The other end is used as a port 4' of the first magnetic integrated structure; air gaps are respectively arranged between the UIU magnetic core magnetic column III and the magnetic column I and between the magnetic column III and the magnetic column II.
Optionally, the second magnetic integrated structure comprises an I-shaped magnetic core and a first primary winding N P1 A first secondary winding N S1 Second primary side first winding N P21 Second primary second winding N P22 First winding N of second secondary side S21 Second winding N of second secondary side S22 The method comprises the steps of carrying out a first treatment on the surface of the The first primary winding N P1 Around the central column III of the magnetic core, a first secondary winding N S1 Wound around the core center post III, the second primary side first winding N P21 A second winding N wound around the core side leg I P22 Wound on the side post II of the magnetic core, and a first winding N of the secondary side S21 A second winding N wound around the core side post I and having a second secondary side S22 Winding on the side column II of the magnetic core; wherein the first primary winding N P1 The same name end of the coil is used as a magnetic integrated structure two-port 1, a first primary winding N P1 Is used as a magnetic integrated structure two-port 2, a first secondary winding N S1 Is used as a magnetic integrated structure two-port 3, a first secondary winding N S1 The opposite end of the first winding N is used as a magnetic integrated structure two-port 4, and the second primary side is provided with a first winding N P21 The same name end of the coil is used as two ports 5 of the magnetic integrated structure, and the second primary side is provided with a first winding N P21 Is identical to the second winding N of the second primary side P22 Is connected with the homonymous end of the second primary side second winding N P22 The opposite end of the second secondary side is used as a magnetic integrated structure two-port 6, and the first winding N S21 The same name end of the second secondary side is used as a magnetic integrated structure two-port 7, and the first winding N of the second secondary side S21 Is identical to the second winding N of the second secondary side S22 Is connected with the homonymous end of the second winding N S22 As the magnetic integrated structure two ports 8.
Optionally, the magnetic core of magnetism integrated configuration two is "I" type magnetic core structure, including two relative "U" type magnetic cores and two "I" type magnetic cores, the zonulae occludens does not have the air gap between two relative "U" type magnetic cores of magnetism integrated configuration, constitutes "I" type magnetic core, is located the middle of two "I" type magnetic cores, be equipped with the air gap between two "I" type magnetic cores and the "I" type magnetic core opening part.
Optionally, the first primary inverter bridge and the second primary inverter bridge adopt frequency conversion control, phase shift control, frequency conversion and phase shift mixed control.
The beneficial effects of the invention are as follows: the invention improves the existing structure, provides two new magnetic integration structures, namely a first magnetic integration structure integrates the resonant inductance of the two-phase full-bridge LLC resonant converter in one magnetic core, a second magnetic integration structure integrates the transformer of the two-phase full-bridge LLC resonant converter and the excitation inductance thereof in one magnetic core, and the whole converter only comprises two magnetic elements, so that the practical design and application are convenient, the running state of the integrated converter is not affected, the weight and the volume of the magnetic elements are effectively reduced, the loss of the converter is reduced, and the power density of the converter is improved. The two-phase or multi-phase full-bridge LLC resonant converters are operated in a staggered parallel mode, so that the power and the capacity of the converters are effectively expanded, and the high-efficiency transmission of electric energy is realized; the two phases of the magnetic integration staggered parallel full-bridge LLC resonant converter adopt the mode of parallel input and parallel output, and the capacity of the converter is expanded, and meanwhile, the current sharing of the output of the two-phase full-bridge LLC resonant converter is ensured.
Drawings
FIG. 1 is a schematic diagram of a magnetically integrated interleaved parallel LLC resonant converter according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the structure of the present invention using only one UIU-type core to magnetically integrate two-phase resonant inductors.
Fig. 3 is a schematic diagram of a two-phase transformer and its excitation inductance magnetically integrated using only one "I-I" type core in accordance with the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings: it should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation. (the invention will now be further explained and illustrated by means of a method in connection with the detailed description and the accompanying drawings)
Fig. 1 is a schematic diagram of a magnetically integrated interleaved parallel LLC resonant converter according to an embodiment of the present invention, where the magnetically integrated interleaved parallel LLC resonant converter according to the embodiment of the present invention includes: primary side DC power supply V in Input filter capacitor C in The first primary side inverter bridge, the second primary side inverter bridge, resonance and voltage conversion, the first secondary side rectifier bridge, the second secondary side rectifier bridge and outputFilter capacitor C 0 Output load R 0 The method comprises the steps of carrying out a first treatment on the surface of the The first primary inverter bridge is connected with the second primary inverter bridge, the resonance and the voltage conversion, the second primary inverter bridge, the resonance and the voltage conversion are respectively connected with the first primary inverter bridge, the second primary inverter bridge, the first secondary rectifier bridge and the second secondary rectifier bridge, and the first secondary rectifier bridge, the second secondary rectifier bridge and the output filter capacitor C 0 Output load R 0 The first primary inverter bridge and the second primary inverter bridge are connected with a primary DC power supply V respectively in Input filter capacitor C in Connecting; the resonance and voltage change consists of a first magnetic integration structure and a second magnetic integration structure, wherein the first magnetic integration structure integrates the resonance inductance of the two-phase full-bridge LLC resonance converter in one magnetic core, and the second magnetic integration structure integrates the transformer of the two-phase full-bridge LLC resonance converter and the excitation inductance of the transformer;
the first primary inverter bridge comprises a switching device Q 1 Switching device Q 2 Switching device Q 3 Switching device Q 4 Switching device Q 1 Source and switch device Q 2 Is connected with the drain electrode of the switching device Q 3 Source and switch device Q 4 Is connected with the drain electrode of the switching device Q 1 Drain-to-switch device Q 3 Is connected with the drain electrode of the switching device Q 2 Source and switch device Q 4 The source electrode of the transistor is connected; the second primary inverter bridge comprises a switching device Q 5 Switching device Q 6 Switching device Q 7 Switching device Q 8 Switching device Q 5 Source and switch device Q 6 Is connected with the drain electrode of the switching device Q 7 Source and switch device Q 8 Is connected with the drain electrode of the switching device Q 5 Drain-to-switch device Q 7 Is connected with the drain electrode of the switching device Q 6 Source and switch device Q 8 The source electrode of the transistor is connected; switching device Q in the first primary inverter bridge 1 Drain of (d) switching device Q 3 Is connected with the drain electrode of the switching device Q in the second primary side inversion bridge 5 Drain of (d) switching device Q 7 Is connected with the drain electrode to form a nodePoint (1), switching device Q in the first primary inverter bridge 2 Source of (d) switching device Q 4 Switching device Q in the bridge with the source electrode of the second primary side inversion 6 Source of (d) switching device Q 8 Form a node (2) with the source electrode of the transistor; the resonance and voltage transformation comprises a first resonance capacitor C r1 A second resonance capacitor C r2 A first magnetic integrated structure and a second magnetic integrated structure; the first secondary side rectifier bridge comprises a rectifier diode D r1 Rectifier diode D r2 Rectifier diode D r3 Rectifier diode D r4 Rectifier diode D r1 Anode co-rectifying diode D of (C) r2 A rectifying diode D connected with the cathode of the capacitor r3 Anode co-rectifying diode D of (C) r4 A rectifying diode D connected with the cathode of the capacitor r1 Cathode co-rectifying diode D r3 A rectifying diode D connected with the cathode of the capacitor r2 Anode co-rectifying diode D of (C) r4 Is connected with the anode of the battery; the second secondary rectifier bridge comprises a rectifier diode D r5 Rectifier diode D r6 Rectifier diode D r7 Rectifier diode D r8 Rectifier diode D r5 Anode co-rectifying diode D of (C) r6 A rectifying diode D connected with the cathode of the capacitor r7 Anode co-rectifying diode D of (C) r8 A rectifying diode D connected with the cathode of the capacitor r5 Cathode co-rectifying diode D r7 A rectifying diode D connected with the cathode of the capacitor r6 Anode co-rectifying diode D of (C) r8 Is connected with the anode of the battery; rectifier diode D in the first secondary rectifier bridge r1 Cathode of rectifier diode D r3 Rectifier diode D in rectifier bridge with second secondary side r5 Cathode of rectifier diode D r7 The cathodes of the first secondary side rectifier bridge are connected to form a node (3), and a rectifier diode D in the first secondary side rectifier bridge r2 Anode of rectifier diode D r4 Rectifier diode D in rectifier bridge with anode and second secondary side r6 Anode of rectifier diode D r8 Is connected to form a node (4); the input filter capacitor C in Is connected with the node (1) and the node (2); the output filter capacitor C 0 Is connected with the node (3) and the node (4);the primary side direct current power supply V in Same-input filter capacitor C in Is connected with each other; the output load R 0 Same output filter capacitor C 0 Is connected with each other; the first port 1 'of the magnetic integration structure is connected with the first primary inversion bridge port A, the first port 3' of the magnetic integration structure is connected with the second port 1 of the magnetic integration structure, and the second port 2 of the magnetic integration structure is connected with the first resonant capacitor C r1 The first primary side inversion bridge port B is connected with the second primary side inversion bridge port B, the magnetic integration structure two port 3 is connected with the first secondary side rectifier bridge port C, the magnetic integration structure two port 4 is connected with the first secondary side rectifier bridge port D, the magnetic integration structure one port 2 'is connected with the second primary side inversion bridge port E, the magnetic integration structure one port 4' is connected with the magnetic integration structure two port 5, and the magnetic integration structure two port 6 is connected with the second resonance capacitor C r2 And then the magnetic integrated structure two ports 7 are connected with the second secondary rectifying bridge port G, and the magnetic integrated structure two ports 8 are connected with the second secondary rectifying bridge port H.
The first magnetic integration structure and the second magnetic integration structure are the main content of the invention, and are two multiport structures, the first magnetic integration structure can adopt the structural form shown in fig. 2, two-phase resonant inductors are integrated in one magnetic core, the second magnetic integration structure can adopt the structural form shown in fig. 3, a two-phase transformer and excitation inductors thereof are integrated in one magnetic core, and the whole transformer only comprises two magnetic elements, so that the practical design and application are convenient, the weight and volume of the magnetic elements are effectively reduced, the practical design and application are convenient, and the power density of the transformer is improved.
Fig. 2 is a schematic diagram of the structure of the present invention using only one UIU-type core to magnetically integrate two-phase resonant inductors. The magnetic integrated structure I comprises a UIU magnetic core and a first resonant inductance winding L r1 First winding L of second resonant inductor r21 Second winding L of second resonant inductor r22 The method comprises the steps of carrying out a first treatment on the surface of the The first resonant inductance winding L r1 A first winding L of a second resonant inductor wound around the core jamb I r21 A second winding L of a second resonant inductor wound around the center post III of the magnetic core r22 Winding on the side column II of the magnetic core; wherein the first resonant inductor winding L r1 One end is used as a port 1' of the first magnetic integrated structure, and the first resonant inductance winding L r1 The other end is used as a port 3' of the first magnetic integrated structure, and the first winding L of the second resonant inductor r21 One end is used as a port 2' of the first magnetic integrated structure, and the second resonant inductor is provided with a first winding L r21 The other end is connected with a second winding L of a second resonant inductor r22 Is connected with a second winding L of a second resonant inductor r22 The other end is used as a port 4' of the first magnetic integrated structure; air gaps are respectively arranged between the UIU magnetic core magnetic column III and the magnetic column I and between the magnetic column III and the magnetic column II.
The magnetic flux generated by the first resonant inductor winding of the first magnetic integration structure enhances the magnetic flux of the second resonant inductor winding on the side column II of the magnetic core, the magnetic flux generated by the first resonant inductor winding reduces the magnetic flux of the first resonant inductor winding on the middle column III of the magnetic core, and the influence of the operation of the first resonant inductor on the operation of the second resonant inductor is counteracted; through the rational design to second resonance inductance in magnetic core center pillar III and magnetic core side pillar II turns, the magnetic flux that second resonance inductance first winding and second resonance inductance second winding produced offset each other at magnetic core side pillar I's magnetic flux of first resonance inductance, and second resonance inductance operation does not produce the influence to first resonance inductance operation, has realized the decoupling of two-phase resonance inductance and has integrated, and magnetic integration back side pillar II produced magnetic flux is biggest, but because UIU type magnetic core side pillar II is wider than EE/EI type magnetic core side pillar, so the saturation can reduce.
Fig. 3 is a schematic diagram of a transformer of the present invention that magnetically integrates two phases and their excitation inductance using only one "I-I" type core. The magnetic integrated structure comprises an I-shaped magnetic core and a first primary winding N P1 A first secondary winding N S1 Second primary side first winding N P21 Second primary second winding N P22 First winding N of second secondary side S21 Second winding N of second secondary side S22 The method comprises the steps of carrying out a first treatment on the surface of the The first primary winding N P1 Around the central column III of the magnetic core, a first secondary winding N S1 Wound around the core center post III, the second primary side first winding N P21 A second winding N wound around the core side leg I P22 Around the side post II of the magnetic core, the second auxiliary edgeFirst winding N S21 A second winding N wound around the core side post I and having a second secondary side S22 Winding on the side column II of the magnetic core; wherein the first primary winding N P1 The same name end of the coil is used as a magnetic integrated structure two-port 1, a first primary winding N P1 Is used as a magnetic integrated structure two-port 2, a first secondary winding N S1 Is used as a magnetic integrated structure two-port 3, a first secondary winding N S1 The opposite end of the first winding N is used as a magnetic integrated structure two-port 4, and the second primary side is provided with a first winding N P21 The same name end of the coil is used as two ports 5 of the magnetic integrated structure, and the second primary side is provided with a first winding N P21 Is identical to the second winding N of the second primary side P22 Is connected with the homonymous end of the second primary side second winding N P22 The opposite end of the second secondary side is used as a magnetic integrated structure two-port 6, and the first winding N S21 The same name end of the second secondary side is used as a magnetic integrated structure two-port 7, and the first winding N of the second secondary side S21 Is identical to the second winding N of the second secondary side S22 Is connected with the homonymous end of the second winding N S22 As the magnetic integrated structure two ports 8.
First primary winding N on middle column III of magnetic core of magnetic integrated structure P1 A first secondary winding N S1 The generated magnetic flux and the first winding N of the second primary side on the two side posts I and II of the magnetic core P21 Second primary second winding N P22 First winding N of second secondary side S21 Second winding N of second secondary side S22 The generated magnetic fluxes counteract each other, the operation of the two-phase transformers does not affect each other, and decoupling integration of the two-phase transformers and the transformers is realized.
The first magnetic integration structure and the second magnetic integration structure are applied to the interleaved parallel full-bridge LLC resonant converter, but are not limited thereto, and can be applied to magnetic integration of resonant inductance and resonant inductance in the interleaved parallel full-bridge LLC resonant converter and magnetic integration of transformers and transformers in other embodiments. All the converters and the magnetic integrated structures provided by the invention have natural deduction and change combination forms which are all in the protection.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. Various components mentioned in the present invention are common in the art, and it should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications can be made in the present invention without departing from the spirit and scope of the invention, which is defined in the claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A magnetically integrated interleaved parallel LLC resonant converter, comprising: primary side DC power supply V in Input filter capacitor C in The first primary side inverter bridge, the second primary side inverter bridge, resonance and voltage conversion, the first secondary side rectifier bridge, the second secondary side rectifier bridge and the output filter capacitor C 0 Output load R 0 The method comprises the steps of carrying out a first treatment on the surface of the The first primary inverter bridge is connected with the second primary inverter bridge, the resonance and the voltage conversion, the second primary inverter bridge, the resonance and the voltage conversion are respectively connected with the first primary inverter bridge, the second primary inverter bridge, the first secondary rectifier bridge and the second secondary rectifier bridge, and the first secondary rectifier bridge, the second secondary rectifier bridge and the output filter capacitor C 0 Output load R 0 The first primary inverter bridge and the second primary inverter bridge are connected with a primary DC power supply V respectively in Input filter capacitor C in Connecting; the resonance and voltage change consists of a first magnetic integration structure and a second magnetic integration structure, wherein the first magnetic integration structure integrates the resonance inductance of the two-phase full-bridge LLC resonance converter in one magnetic core, and the second magnetic integration structure integrates the transformer of the two-phase full-bridge LLC resonance converter and the excitation inductance of the transformer;
the first primary inverter bridge is formed by a switching device Q 1 Switching device Q 2 Switching device Q 3 Switching device Q 4 Composition of the switching device Q 1 Source and switch device Q 2 Is connected with the drain electrode of the switching device Q 3 Source and switch device Q 4 Is connected with the drain electrode of the switching device Q 1 Is identical to the drain electrode of (C)Switching device Q 3 Is connected with the drain electrode of the switching device Q 2 Source and switch device Q 4 The source electrode of the transistor is connected; the second primary inverter bridge is formed by a switching device Q 5 Switching device Q 6 Switching device Q 7 Switching device Q 8 Composition of the switching device Q 5 Source and switch device Q 6 Is connected with the drain electrode of the switching device Q 7 Source and switch device Q 8 Is connected with the drain electrode of the switching device Q 5 Drain-to-switch device Q 7 Is connected with the drain electrode of the switching device Q 6 Source and switch device Q 8 The source electrode of the transistor is connected;
switching device Q in the first primary inverter bridge 1 Drain of (d) switching device Q 3 Is connected with the drain electrode of the switching device Q in the second primary side inversion bridge 5 Drain of (d) switching device Q 7 Is connected to form a node (1), and a switching device Q in the first primary inverter bridge 2 Source of (d) switching device Q 4 Switching device Q in the bridge with the source electrode of the second primary side inversion 6 Source of (d) switching device Q 8 Form a node (2) with the source electrode of the transistor;
the resonance and voltage transformation are performed by a first resonance capacitor C r1 A second resonance capacitor C r2 The first magnetic integrated structure and the second magnetic integrated structure;
the first secondary side rectifier bridge is formed by a rectifier diode D r1 Rectifier diode D r2 Rectifier diode D r3 Rectifier diode D r4 Composition, the rectifying diode D r1 Anode co-rectifying diode D of (C) r2 Is connected with the cathode of the rectifying diode D r3 Anode co-rectifying diode D of (C) r4 Is connected with the cathode of the rectifying diode D r1 Cathode co-rectifying diode D r3 Is connected with the cathode of the rectifying diode D r2 Anode co-rectifying diode D of (C) r4 Is connected with the anode of the battery; the second secondary rectifier bridge is formed by a rectifier diode D r5 Rectifier diode D r6 Rectifier diode D r7 Rectifier diode D r8 Composition of the compositionThe rectifying diode D r5 Anode co-rectifying diode D of (C) r6 Is connected with the cathode of the rectifying diode D r7 Anode co-rectifying diode D of (C) r8 Is connected with the cathode of the rectifying diode D r5 Cathode co-rectifying diode D r7 Is connected with the cathode of the rectifying diode D r6 Anode co-rectifying diode D of (C) r8 Is connected with the anode of the battery;
rectifier diode D in the first secondary rectifier bridge r1 Cathode of rectifier diode D r3 Rectifier diode D in rectifier bridge with second secondary side r5 Cathode of rectifier diode D r7 Is connected to form a node (3), and a rectifier diode D in the first secondary rectifier bridge r2 Anode of rectifier diode D r4 Rectifier diode D in rectifier bridge with anode and second secondary side r6 Anode of rectifier diode D r8 Is connected to form a node (4);
the input filter capacitor C in Is connected with the node (1) and the node (2);
the output filter capacitor C 0 Is connected with the node (3) and the node (4);
the primary side direct current power supply V in Same-input filter capacitor C in Is connected with each other;
the output load R 0 Same output filter capacitor C 0 Is connected with each other;
the first port 1 'of the magnetic integrated structure is connected with the first primary inversion bridge port A, the first port 3' of the magnetic integrated structure is connected with the second port 1 of the magnetic integrated structure, and the second port 2 of the magnetic integrated structure is connected with the first resonant capacitor C r1 And then is connected with a first primary side inversion bridge port B, a magnetic integration structure two port 3 is connected with a first secondary side rectifier bridge port C, a magnetic integration structure two port 4 is connected with a first secondary side rectifier bridge port D, a magnetic integration structure one port 2 'is connected with a second primary side inversion bridge port E, a magnetic integration structure one port 4' is connected with a magnetic integration structure two port 5, and a magnetic integration structure two port 6 is connected with a second resonance capacitor C r2 Is then connected with a second primary side inversion bridge port F, theThe two ports 7 of the magnetic integrated structure are connected with the second secondary rectifying bridge port G, and the two ports 8 of the magnetic integrated structure are connected with the second secondary rectifying bridge port H;
the first primary inverter bridge, the first resonant capacitor, the first secondary rectifier bridge, the resonant inductor and the transformer form a first-phase full-bridge LLC resonant converter, the second primary inverter bridge, the second resonant capacitor, the second secondary rectifier bridge, the resonant inductor and the transformer form a second-phase full-bridge LLC resonant converter, and the first-phase full-bridge LLC resonant converter and the second-phase full-bridge LLC resonant converter adopt a connection mode that input ends are connected in parallel and output ends are connected in parallel;
the magnetic integrated structure consists of a UIU magnetic core, a first resonant inductance winding L r1 First winding L of second resonant inductor r21 Second winding L of second resonant inductor r22 Composition; the first resonant inductance winding L r1 A first winding L of the second resonant inductor is wound on the magnetic core side column I r21 A second winding L of the second resonant inductor is wound on the middle column III of the magnetic core r22 Winding on the side column II of the magnetic core; wherein the first resonant inductor winding L r1 One end is used as a port 1' of the first magnetic integrated structure, and the first resonant inductance winding L r1 The other end is used as a port 3' of the first magnetic integrated structure, and the first winding L of the second resonant inductor r21 One end is used as a port 2' of the first magnetic integrated structure, and the second resonant inductor is provided with a first winding L r21 The other end is connected with a second winding L of a second resonant inductor r22 Is connected with a second winding L of a second resonant inductor r22 The other end is used as a port 4' of the first magnetic integrated structure; air gaps are respectively formed between the UIU magnetic core magnetic column III and the magnetic column I and between the UIU magnetic core magnetic column III and the magnetic column II.
2. The magnetically integrated interleaved parallel LLC resonant converter according to claim 1 wherein the magnetically integrated structure two consists of an "I" core, a first primary winding N P1 A first secondary winding N S1 Second primary side first winding N P21 Second primary second winding N P22 First winding N of second secondary side S21 Second winding N of second secondary side S22 Composition;
the first primary winding N P1 Wound around the core center post III, the first secondary winding N S1 Wound around the core center post III, the second primary side first winding N P21 Wound on the magnetic core side column I, the second primary side second winding N P22 Wound on the side post II of the magnetic core, the first winding N of the secondary side S21 Wound on the magnetic core side column I, the second winding N of the second secondary side S22 Winding on the side column II of the magnetic core; wherein the first primary winding N P1 Is used as a magnetic integrated structure two-port 1, the first primary winding N P1 Is used as a magnetic integrated structure two-port 2, the first secondary winding N S1 Is used as a magnetic integrated structure two-port 3, the first secondary winding N S1 Is used as a magnetic integrated structure two-port 4, the second primary side first winding N P21 Is used as a magnetic integrated structure two-port 5, the second primary side first winding N P21 Is identical to the second winding N of the second primary side P22 Is connected with the homonymous end of the second primary side second winding N P22 Is used as a magnetic integrated structure two-port 6, the second secondary side first winding N S21 Is used as a magnetic integrated structure two-port 7, the second secondary side first winding N S21 Is identical to the second winding N of the second secondary side S22 Is connected with the homonymous end of the second winding N S22 As the magnetic integrated structure two ports 8.
3. A magnetically integrated interleaved LLC resonant converter in accordance with claim 1 or 2 wherein the second magnetic core of the magnetically integrated structure is an "I-I" core structure comprising two opposing "U" cores and two "I" cores, the two opposing "U" cores of the magnetically integrated structure being tightly connected without an air gap therebetween to form an "I" core, and being located intermediate the two "I" cores, an air gap being provided between the two "I" cores and the opening of the "I" core.
4. The magnetically integrated interleaved LLC resonant converter of claim 1 wherein the first and second primary inverter bridges are controlled by variable frequency control, phase shift control, and a hybrid of variable frequency and phase shift.
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