CN111628656A - Magnetic integrated full-bridge LLC resonant converter - Google Patents
Magnetic integrated full-bridge LLC resonant converter Download PDFInfo
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- CN111628656A CN111628656A CN202010516044.5A CN202010516044A CN111628656A CN 111628656 A CN111628656 A CN 111628656A CN 202010516044 A CN202010516044 A CN 202010516044A CN 111628656 A CN111628656 A CN 111628656A
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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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- 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
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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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 integrated full-bridge LLC resonant converter. It is characterized by comprising: the device comprises a primary side direct-current power supply, an input filter capacitor, a primary side inverter bridge, a resonance and voltage conversion (comprising a magnetic integrated structure and a resonance capacitor), a secondary side rectifier bridge, an output filter capacitor and an output load; energy is provided by a primary side direct current power supply, enters a resonance and voltage conversion part through inversion of a primary side inverter bridge switching tube, and is finally provided for a load through a secondary side rectifier bridge diode. The magnetic integration structure integrates the resonant inductor, the excitation inductor and the transformer in one magnetic core, and the whole converter only comprises one magnetic element, so that the volume of the magnetic element is effectively reduced, and the power density of the converter is improved. The invention can realize high-power, small-volume and high-efficiency energy transfer under the frequency conversion control, the phase shift control and the frequency conversion and phase shift mixed control, and has the advantages of wide voltage input range, wide gain range, high transmission efficiency, easy realization of soft switching and the like.
Description
Technical Field
The invention relates to a power electronic magnetic integration technology, in particular to a magnetic integration full-bridge LLC resonant converter.
Background
The LLC resonant converter adopting the soft switching technology has the advantages of wide voltage input range, wide gain range, high transmission efficiency, easy soft switching realization and the like, and is rapidly developed in recent years, so that the application field of the LLC resonant converter is continuously expanded. With the application of the third generation semiconductor devices, such as silicon carbide and gallium nitride, the converter is moving toward high frequency and high power density. However, the LLC resonant converter has a large number of magnetic elements, and the magnetic elements such as transformers and inductors account for 30-40% of the converter by weight and about 20-30% of the converter by volume, so the magnetic elements become the main factor limiting the increase of the converter power density. Too many magnetic components result in large transducer volumes and weight, increased cost, and reduced power density. Through certain coupling mode, reasonable design parameter makes the magnetic element (inductance, transformer etc.) among the power electronic device integrated on a magnetic core, becomes an integrated magnetic element with a plurality of discrete components, can reduce magnetic device's volume, weight, can also reduce the electric current ripple, reduce the magnetic element loss, improve power dynamic behavior, and it is significant to the performance and the power density that improve the power.
In the actual design of the prior art, a leakage inductance substitution method is usually adopted for integrating an inductor and a transformer of the LLC resonant converter, and the working frequency range of the converter is limited due to smaller leakage inductance; the leakage inductance is not easy to control accurately, and the secondary side of the transformer also has leakage inductance, so that the loss of the converter is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a magnetic integration full-bridge LLC resonant converter to realize the integration among a resonant inductor, an excitation inductor and a transformer of the LLC resonant converter and reduce the saturation of a side column of a magnetic core after magnetic integration, so that the volume of the magnetic core after magnetic integration can be further reduced, and the power density of the converter is improved.
The invention provides a magnetic integrated full-bridge LLC resonant converter, which is characterized by comprising the following components: primary side direct current power supply, input filter capacitor and primary side direct current power supplySide inverter bridge, resonance and voltage transformation, secondary side rectifier bridge and output filter capacitor CoAnd an output load; the primary side direct current power supply is respectively connected with the input filter capacitor, the output load, the primary side inverter bridge, the resonance and voltage conversion and the secondary side rectifier bridge; the resonance and voltage conversion are realized by a resonance capacitor CrAnd a magnetic integrated structure; the primary side inverter bridge consists of a switching device Q1Switching device Q2Switching device Q3Switching device Q4Composition of, the switching device Q1Source electrode of same switching device Q2Is connected to the drain of the switching device Q3Source electrode of same switching device Q4Is connected to the drain of the switching device Q1Drain electrode of the same-switch device Q3Is connected to the drain of the switching device Q2Source electrode of same switching device Q4The source electrodes of the first and second transistors are connected; the resonance and voltage conversion are realized by a resonance capacitor CrThe magnetic integrated structure comprises a magnetic integrated structure port 1, a magnetic integrated structure port 2, a magnetic integrated structure port 3 and a magnetic integrated structure port 4, the primary side inverter bridge is respectively connected with the resonant capacitor and the magnetic integrated structure port 1, the resonant capacitor is connected with the magnetic integrated structure port 2, and the magnetic integrated structure port 3 and the magnetic integrated structure port 4 are respectively connected with the secondary side rectifier bridge; the secondary side rectifier bridge is composed of a rectifier diode Dr1Rectifier diode Dr2Rectifier diode Dr3Rectifier diode Dr4Composition of, the rectifier diode Dr1Anode of the same rectifier diode Dr2Is connected to the cathode of the rectifier diode Dr3Anode of the same rectifier diode Dr4Is connected to the cathode of the rectifier diode Dr1Cathode of the same-rectifier diode Dr3Is connected to the cathode of the rectifier diode Dr2Anode of the same rectifier diode Dr4The anode of the anode is connected; the input filter capacitor CinSwitching device Q of same-primary-side inverter bridge1Drain electrode, switching device Q3Drain and switching device Q2Source, switching device Q4The source electrodes are connected; the output filter capacitor C0Rectifier diode D on the same side and on the other sider1Cathode of (2), rectifier diode Dr3Cathode and rectifier diode Dr2Anode of (2), rectifier diode Dr4The anode of the anode is connected; the primary side direct current power supply VinSame-input filter capacitor CinConnecting; the output load R0Same-output filter capacitor C0Connecting; the port 1 of the magnetic integrated structure is connected with the port A of the primary side inverter bridge, and the port 2 of the magnetic integrated structure is connected with the resonant capacitor CrAnd the magnetic integrated structure port 3 is connected with a secondary side rectifier bridge side port C, and the magnetic integrated structure port 4 is connected with a secondary side rectifier bridge side port D.
Optionally, the magnetic integrated structure further comprises a magnetic core and a primary winding NPSecondary winding NSFirst winding L of resonant inductorr1Second winding L of resonant inductorr2(ii) a The magnetic core is of a cylindrical structure and consists of a magnetic core side column I, a magnetic core side column II and a magnetic core middle column III, and a primary winding NPWound on the center pillar III of the magnetic core and provided with a secondary winding NSWound on the center pillar III of the magnetic core, a first winding L of a resonant inductorr1A second winding L of resonant inductor wound on the side column I of the magnetic corer2Winding on the magnetic core side post II; wherein the resonant inductor first winding Lr1The same name end of the resonant inductor is used as a magnetic integrated structure port 1, and a first winding L of the resonant inductorr1Second winding L of different-name end same-resonance inductorr2Primary winding N connected with the same name endPSecond winding L of homonymous terminal homoresonance inductorr2The different name ends are connected, and the primary winding NPThe different name end is used as a port 2 of the magnetic integrated structure and a secondary winding NSThe homonymous terminal is used as a port 3 of the magnetic integrated structure and a secondary winding NSThe synonym terminal is used as a magnetic integrated structure port 4.
Optionally, the magnetic integrated structure further comprises a magnetic core and a resonant inductor winding LrPrimary side first winding NP1Primary side secondary winding NP2Secondary winding NS(ii) a The magnetic core is UIU type structure, the magnetic core comprises magnetic core side post I, magnetic core side post II, magnetic core center pillar III, resonance inductance winding LrA first winding N wound on the side column I of the magnetic core and on the primary sideP1A secondary winding N wound on the center pillar III of the magnetic coreP2Winding on the side column II of the magnetic core and a secondary winding NSWinding on the center pillar III of the magnetic core; wherein the resonant inductor winding LrThe same name end of the resonant inductor is used as a magnetic integrated structure port 1, and the resonant inductor winding LrFirst winding N with different name ends and same primary sideP1The same name ends are connected, and a primary side first winding NP1Second winding N with different name end and same primary sideP2Are connected with the same name end of the primary side second winding NP2The different name end of the magnetic integrated structure is used as a port 2 of the magnetic integrated structure, and a secondary winding NSThe same name end of the magnetic integrated structure is used as a port 3 of the magnetic integrated structure and a secondary winding NSThe synonym end of the magnetic integrated structure is used as a port 4 of the magnetic integrated structure; air gaps are respectively arranged between the magnetic core middle column III and the magnetic core side column I and between the magnetic core middle column III and the magnetic core side column II of the UIU-shaped magnetic core.
Optionally, the "cylindrical" magnetic core of the magnetic integrated structure is composed of a "cylindrical" I magnetic rod, a "cylindrical" ii magnetic rod, a "cylindrical" iii magnetic rod, a round-angle "I" type iv magnetic core, and a round-angle "I" type v magnetic core; the cylindrical magnet bar III is used as a center pillar of the magnetic core, the cylindrical magnet bar I is used as a left pillar of the magnetic core, the cylindrical magnet bar II is used as a right pillar of the magnetic core, the round-cornered I-shaped IV magnetic core is used as an upper pillar of the magnetic core, and the round-cornered I-shaped V magnetic core is used as a lower pillar of the magnetic core; air gaps are arranged between the cylindrical magnetic core column IV and the magnetic columns I, II and III and between the magnetic column V and the magnetic columns I, II and III.
Optionally, the magnetic integrated structure is suitable for a resonant converter with a secondary side leakage inductance of a transformer and a primary side series inductance of a small transformer.
Optionally, the primary side inverter bridge adopts frequency conversion control, phase shift control, and frequency conversion + phase shift mixed control.
The invention has the beneficial effects that: the invention improves the existing structure and provides a new magnetic integrated structure which is a four-port structure and has two different implementation forms, and the structure form can adopt the structure form shown in figure 4 besides the structure form shown in figure 2. When the magnetic core is in the structure shown in fig. 2, the number of the air gaps is doubled, the length of the air gaps is reduced by half, the air gaps are symmetrical, the air gap diffusion magnetic flux is obviously reduced, the electromagnetic interference is reduced, the winding coil is tighter, the cross section area of the air gaps is reduced, the coil loss is reduced, and the magnetic conductance area is increased. When the magnetic core is in the structure of fig. 4, the problem of saturation of two side columns of the magnetic core after the resonance inductor and the transformer are magnetically integrated can be effectively solved, and the practical design and application are facilitated. The LLC resonant converter after magnetic integration has the advantages that the weight and the volume are reduced, the power density effect of the converter is improved, and the running state of the resonant inductor and the transformer after magnetic integration is not influenced. The saturation of the integrated magnetic element is reduced, and the loss of the converter is reduced.
Drawings
Fig. 1 is a schematic diagram of LLC resonant conversion provided in the embodiment of the present invention.
Fig. 2 is a schematic diagram of the structure of the present invention in which an inductor is disposed on the left-hand leg and the right-hand leg and a transformer is disposed on the center leg by using only one "cylindrical" type magnetic core.
Figure 3 is a three-dimensional view of the present invention using only one "cylindrical" type core.
Fig. 4 is a schematic diagram of the structure of the present invention in which an inductor is disposed in the left leg and a transformer is disposed in the center and right legs using only one UIU-shaped magnetic core.
As shown, the primary side DC power supply VinAn input filter capacitor CinAn output filter capacitor CoOutput load Ro1-1 of a cylindrical magnetic rod I, 1-2 of a cylindrical magnetic rod II, 1-3 of a cylindrical magnetic rod III, 1-4 of a round-corner I-shaped magnetic core IV, 1-5 of a round-corner I-shaped magnetic core V, an I2-1 of a magnetic core side column I, an II2-2 of a magnetic core side column II and an III2-3 of a magnetic core center column III.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings: it should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention. (the invention will now be further explained and illustrated by means of the description and the figures)
Fig. 1 shows a magnetic integrated full-bridge LLC resonant converter provided in an embodiment of the present inventionIt is intended that the magnetic integrated full-bridge LLC resonant converter provided by the embodiment of the invention comprises a primary side direct current power supply VinAn input filter capacitor CinPrimary side inverter bridge, resonance and voltage conversion, secondary side rectifier bridge and output filter capacitor CoOutput load Ro(ii) a The primary side inverter bridge comprises a switching device Q1Switching device Q2Switching device Q3Switching device Q4Switching device Q1Source electrode of same switching device Q2Is connected to the drain of the switching device Q3Source electrode of same switching device Q4Is connected to the drain of the switching device Q1Drain electrode of the same-switch device Q3Is connected to the drain of the switching device Q2Source electrode of same switching device Q4The source electrodes of the first and second transistors are connected; the resonance and voltage conversion comprises a resonance capacitor CrA magnetic integrated structure; the secondary side rectifier bridge comprises a rectifier diode Dr1Rectifier diode Dr2Rectifier diode Dr3Rectifier diode Dr4Rectifier diode Dr1Anode of the same rectifier diode Dr2Is connected to the cathode of a rectifier diode Dr3Anode of the same rectifier diode Dr4Is connected to the cathode of a rectifier diode Dr1Cathode of the same-rectifier diode Dr3Is connected to the cathode of a rectifier diode Dr2Anode of the same rectifier diode Dr4The anode of the anode is connected; the input filter capacitor CinSwitching device Q of same-primary-side inverter bridge1Drain electrode, switching device Q3Drain and switching device Q2Source, switching device Q4The source electrodes are connected; the output filter capacitor C0Rectifier diode D on the same side and on the other sider1Cathode of (2), rectifier diode Dr3Cathode and rectifier diode Dr2Anode of (2), rectifier diode Dr4The anode of the anode is connected; the primary side direct current power supply VinSame-input filter capacitor CinConnecting; the output load R0Same-output filter capacitor C0Connecting; the port 1 of the magnetic integrated structure is connected with the port A of the primary side inverter bridge, and the port 2 of the magnetic integrated structure is connected with the resonant capacitor CrAnd the magnetic integrated structure port 3 is connected with a secondary side rectifier bridge side port C, and the magnetic integrated structure port 4 is connected with a secondary side rectifier bridge side port D.
The magnetic integration structure is a four-port structure, can adopt the structural form shown in fig. 2 and also can adopt the structural form shown in fig. 4, and respectively solves the problem that two side columns of the magnetic core are saturated after the resonance inductor and the transformer are magnetically integrated and the problem that two side columns II of the magnetic core are saturated after the resonance inductor and the transformer are magnetically integrated, so that the practical design and application are facilitated. The primary side inverter bridge of the converter adopts frequency conversion control, phase shift control, frequency conversion and phase shift mixed control and the like. During energy transfer, the primary side inverter bridge works in an inversion state, and the secondary side rectifier bridge diode works in a rectification state.
Fig. 2 is a schematic diagram of the structure of the present invention in which an inductor is disposed on the left-hand leg and the right-hand leg and a transformer is disposed on the center leg by using only one "cylindrical" type magnetic core. The magnetic integrated structure also comprises a cylindrical magnetic core and a primary winding NPSecondary winding NSFirst winding L of resonant inductorr1Second winding L of resonant inductorr2(ii) a Primary winding NPWound on the center pillar III of the magnetic core and provided with a secondary winding NSWound on the center pillar III of the magnetic core, a first winding L of a resonant inductorr1A second winding L of resonant inductor wound on the side column I of the magnetic corer2Winding on the magnetic core side post II; wherein the resonant inductor first winding Lr1The same name end of the resonant inductor is used as a magnetic integrated structure port 1, and a first winding L of the resonant inductorr1Second winding L of different-name end same-resonance inductorr2Primary winding N connected with the same name endPSecond winding L of homonymous terminal homoresonance inductorr2The different name ends are connected, and the primary winding NPThe different name end is used as a port 2 of the magnetic integrated structure and a secondary winding NSThe homonymous terminal is used as a port 3 of the magnetic integrated structure and a secondary winding NSThe synonym terminal is used as a magnetic integrated structure port 4.
Magnetic fluxes generated by the resonant inductance first winding and the inductance second winding on the two side columns of the magnetic integrated structure are mutually offset in the magnetic core middle column, and the operation of the resonant inductance does not influence the operation of the transformer; the magnetic flux of the first winding of the transformer winding pair resonant inductor on the magnetic core side column I is enhanced, the magnetic flux of the second winding of the transformer winding pair inductor on the magnetic core side column II is reduced, and the influence of the operation of the transformer winding on the operation of the inductor is mutually offset. The decoupling integration of inductance and transformer has been realized, and the magnetic flux that magnetism integration back side post I produced is the biggest, nevertheless because the inherent characteristic of "cylinder" type magnetic core, air gap diffusion magnetic flux is showing and is reducing, reduces electromagnetic interference, and the winding coil is inseparabler, reduces the space sectional area to reduce the coil loss, increase magnetic conductance area.
Figure 3 is a three-dimensional view of the present invention using only one "cylindrical" type core. The cylindrical magnetic core of the magnetic integrated structure consists of a cylindrical I magnetic rod, a cylindrical II magnetic rod, a cylindrical III magnetic rod, a fillet I magnetic core and a fillet I magnetic core; the cylindrical magnet bar III is used as a center pillar of the magnetic core, the cylindrical magnet bar I is used as a left pillar of the magnetic core, the cylindrical magnet bar II is used as a right pillar of the magnetic core, the round-cornered I-shaped IV magnetic core is used as an upper pillar of the magnetic core, and the round-cornered I-shaped V magnetic core is used as a lower pillar of the magnetic core; air gaps are arranged between the cylindrical magnetic core column IV and the magnetic columns I, II and III and between the magnetic column V and the magnetic columns I, II and III.
Fig. 4 is a schematic diagram of the structure of the present invention in which an inductor is disposed in the left leg and a transformer is disposed in the center and right legs using only one UIU-shaped magnetic core. The magnetic integrated structure also comprises a UIU-shaped magnetic core and a resonant inductance winding LrPrimary side first winding NP1Primary side secondary winding NP2Secondary winding NS(ii) a Resonant inductor winding LrA first winding N wound on the side column I of the magnetic core and on the primary sideP1A secondary winding N wound on the center pillar III of the magnetic coreP2Winding on the side column II of the magnetic core and a secondary winding NSWinding on the center pillar III of the magnetic core; wherein the resonant inductor winding LrThe same name end of the resonant inductor is used as a magnetic integrated structure port 1, and the resonant inductor winding LrFirst winding N with different name ends and same primary sideP1The same name ends are connected, and a primary side first winding NP1Second winding N with different name end and same primary sideP2Are connected with the same name end of the primary side second winding NP2The different name end of the magnetic integrated junction is used as a magnetic integrated junctionConstituting port 2, secondary winding NSThe same name end of the magnetic integrated structure is used as a port 3 of the magnetic integrated structure and a secondary winding NSThe synonym end of the magnetic integrated structure is used as a port 4 of the magnetic integrated structure; air gaps are formed between the UIU magnetic core column III and the magnetic column I and between the magnetic column III and the magnetic column II.
The magnetic flux generated by the resonant inductor of the magnetic integrated structure enhances the magnetic flux of the primary side first winding in the middle column III of the magnetic core, reduces the magnetic flux of the secondary side winding in the middle column III of the magnetic core, reduces the magnetic flux of the primary side second winding in the side column II of the magnetic core, and counteracts the influence of the operation of the resonant inductor on the operation of the transformer; through the reasonable design of the number of turns of the resonance inductor on the side column I of the magnetic core, the magnetic fluxes generated by the primary side first winding, the primary side first winding and the secondary side winding counteract the magnetic flux of the inductor on the side column I of the magnetic core, and the operation of the transformer does not affect the operation of the inductor. The decoupling integration of the inductor and the transformer is realized, the magnetic flux generated by the center post after the magnetic integration is maximum, but the saturation can be reduced because the UIU-shaped magnetic core side post is wider than the common EE/EI-shaped magnetic core side post.
The magnetic integration structure is applied to the LLC resonant converter, but is not limited to the LLC resonant converter, and can be applied to the magnetic integration of the resonant inductor and the transformer in the magnetic integration full-bridge LLC resonant converter in other embodiments. All the transducers and magnetic integrated structures proposed by the present invention are protected in their natural deduction and variation combinations.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications can be made without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (6)
1. A magnetically integrated full bridge LLC resonant converter, comprising: primary side direct current power supply, input filter capacitor, primary side inverter bridge, resonance and voltage conversion, secondary side rectifier bridge and output filter capacitor CoAnd an output load; the primary side direct current power supply is respectively connected with an input filter capacitor, an output load, a primary side inverter bridge, resonance and voltage conversion and auxiliaryThe side rectifier bridge is connected; the resonance and voltage conversion are realized by a resonance capacitor CrAnd a magnetic integrated structure;
the primary side inverter bridge consists of a switching device Q1Switching device Q2Switching device Q3Switching device Q4Composition of, the switching device Q1Source electrode of same switching device Q2Is connected to the drain of the switching device Q3Source electrode of same switching device Q4Is connected to the drain of the switching device Q1Drain electrode of the same-switch device Q3Is connected to the drain of the switching device Q2Source electrode of same switching device Q4The source electrodes of the first and second transistors are connected;
the resonance and voltage conversion are realized by a resonance capacitor CrThe magnetic integrated structure comprises a magnetic integrated structure port 1, a magnetic integrated structure port 2, a magnetic integrated structure port 3 and a magnetic integrated structure port 4, the primary side inverter bridge is respectively connected with the resonant capacitor and the magnetic integrated structure port 1, the resonant capacitor is connected with the magnetic integrated structure port 2, and the magnetic integrated structure port 3 and the magnetic integrated structure port 4 are respectively connected with the secondary side rectifier bridge;
the secondary side rectifier bridge is composed of a rectifier diode Dr1Rectifier diode Dr2Rectifier diode Dr3Rectifier diode Dr4Composition of, the rectifier diode Dr1Anode of the same rectifier diode Dr2Is connected to the cathode of the rectifier diode Dr3Anode of the same rectifier diode Dr4Is connected to the cathode of the rectifier diode Dr1Cathode of the same-rectifier diode Dr3Is connected to the cathode of the rectifier diode Dr2Anode of the same rectifier diode Dr4The anode of the anode is connected;
the input filter capacitor CinSwitching device Q of same-primary-side inverter bridge1Drain electrode, switching device Q3Drain and switching device Q2Source, switching device Q4The source electrodes are connected;
the output filter capacitor C0Rectifier diode D on the same side and on the other sider1Cathode of (2), rectifier diodeDr3Cathode and rectifier diode Dr2Anode of (2), rectifier diode Dr4The anode of the anode is connected;
the primary side direct current power supply VinSame-input filter capacitor CinConnecting;
the output load R0Same-output filter capacitor C0Connecting;
the port 1 of the magnetic integrated structure is connected with the port A of the primary side inverter bridge, and the port 2 of the magnetic integrated structure is connected with the resonant capacitor CrAnd the magnetic integrated structure port 3 is connected with a secondary side rectifier bridge side port C, and the magnetic integrated structure port 4 is connected with a secondary side rectifier bridge side port D.
2. A magnetically integrated full-bridge LLC resonant converter according to claim 1, wherein said magnetically integrated structure comprises a magnetic core, a primary winding NPSecondary winding NSFirst winding L of resonant inductorr1Second winding L of resonant inductorr2Composition is carried out; the magnetic core is of a cylindrical structure and consists of a magnetic core side column I, a magnetic core side column II and a magnetic core middle column III, and the primary winding NPWound on the center pillar III of the magnetic core, and the secondary winding NSWound on the center pillar III of the magnetic core, and a first winding L of the resonant inductorr1Wound on the side column I of the magnetic core, and a second winding L of the resonant inductorr2Winding on the magnetic core side post II;
wherein the resonant inductor first winding Lr1The same name end of the resonant inductor is used as a magnetic integrated structure port 1, and the first winding L of the resonant inductorr1Second winding L of different-name end same-resonance inductorr2The same name end is connected, and the primary winding NPSecond winding L of homonymous terminal homoresonance inductorr2Different name ends are connected, and the primary winding NPThe different name end is used as a magnetic integrated structure port 2, and the secondary winding NSThe homonymous terminal is used as a port 3 of the magnetic integrated structure and a secondary winding NSThe synonym terminal is used as a magnetic integrated structure port 4.
3. According to the claimsThe magnetic integrated full-bridge LLC resonant converter is characterized in that the magnetic integrated structure consists of a magnetic core and a resonant inductor winding LrPrimary side first winding NP1Primary side secondary winding NP2Secondary winding NSComposition is carried out; the magnetic core is UIU type structure, the magnetic core comprises magnetic core side post I, magnetic core side post II, magnetic core center pillar III, resonance inductance winding LrWound on a side column I of a magnetic core, and a primary side first winding NP1Wound on the center pillar III of the magnetic core, and the secondary winding N of the primary sideP2Wound on the side column II of the magnetic core, and the secondary winding NSWinding on the center pillar III of the magnetic core;
wherein the resonant inductor winding LrThe same name end of the resonant inductor is used as a magnetic integrated structure port 1, and the resonant inductor winding LrFirst winding N with different name ends and same primary sideP1The same name end is connected with the primary side first winding NP1Second winding N with different name end and same primary sideP2Are connected with the same name end of the primary side second winding NP2The different name end of the magnetic integrated structure is used as a port 2 of the magnetic integrated structure, and the secondary winding NSThe same name end of the magnetic integrated structure is used as a port 3 of the magnetic integrated structure and a secondary winding NSThe synonym end of the magnetic integrated structure is used as a port 4 of the magnetic integrated structure;
air gaps are respectively arranged between the magnetic core middle column III and the magnetic core side column I and between the magnetic core middle column III and the magnetic core side column II of the UIU-shaped magnetic core.
4. A magnetic integrated full-bridge LLC resonant converter as claimed in claim 1 or 2, characterized in that the "cylindrical" magnetic core of said magnetic integrated structure is composed of a "cylindrical" I magnetic bar, a "cylindrical" ii magnetic bar, a "cylindrical" iii magnetic bar, a rounded corner "I" type iv magnetic core, a rounded corner "I" type v magnetic core;
the cylindrical magnetic rod III is used as a magnetic core middle column, the cylindrical magnetic rod I is used as a magnetic core left side column, the cylindrical magnetic rod II is used as a magnetic core right side column, the fillet I-shaped magnetic core IV is used as a magnetic core upper column, and the fillet I-shaped magnetic core V is used as a magnetic core lower column; air gaps are arranged between the cylindrical magnetic core column IV and the magnetic columns I, II and III and between the magnetic column V and the magnetic columns I, II and III.
5. The LLC resonant converter as recited in claim 1, wherein said magnetic integrated structure is used in a resonant converter with a series inductance on a secondary side of a transformer and a leakage inductance on a secondary side of the transformer.
6. The magnetic integrated full-bridge LLC resonant converter according to claim 1, wherein said primary inverter bridge employs frequency conversion control, phase shift control, frequency conversion + phase shift hybrid control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010516044.5A CN111628656B (en) | 2020-06-09 | 2020-06-09 | Magnetic integrated full-bridge LLC resonant converter |
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| JP2020202706A (en) * | 2019-06-13 | 2020-12-17 | 株式会社明電舎 | Bidirectional isolated dc-dc converter |
| CN112737348A (en) * | 2021-01-22 | 2021-04-30 | 天津工业大学 | Magnetic integration three-port DC-DC converter |
| CN112751489A (en) * | 2021-01-18 | 2021-05-04 | 天津工业大学 | Magnetic integration interleaved LLC resonant converter |
| CN114244073A (en) * | 2021-12-18 | 2022-03-25 | 北京动力源科技股份有限公司 | Voltage-expanding toroidal transformer and magnetic integration structure and method of voltage-expanding toroidal transformer and resonant converter |
| CN115001285A (en) * | 2022-08-01 | 2022-09-02 | 银河航天(西安)科技有限公司 | Power conversion circuit and power conversion system |
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