CN115459561B - Converter device suitable for distributed photovoltaic - Google Patents

Converter device suitable for distributed photovoltaic Download PDF

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Publication number
CN115459561B
CN115459561B CN202211410774.2A CN202211410774A CN115459561B CN 115459561 B CN115459561 B CN 115459561B CN 202211410774 A CN202211410774 A CN 202211410774A CN 115459561 B CN115459561 B CN 115459561B
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winding
llc module
llc
section
module
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CN115459561A (en
Inventor
熊俊杰
郑雅铭
曾伟
饶臻
顾伟
吴在军
吴志
周苏洋
罗李子
路小俊
唐成虹
郑舒
张国秦
黄绍真
过亮
陈博
张远来
温志明
晏斐
晏欢
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Tellhow Software Co ltd
State Grid Corp of China SGCC
Southeast University
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
Nari Technology Co Ltd
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Tellhow Software Co ltd
State Grid Corp of China SGCC
Southeast University
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
Nari Technology Co Ltd
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0064—Magnetic structures combining different functions, e.g. storage, filtering or transformation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • 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
    • 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
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • H02M3/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • 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
    • H02M3/01—Resonant DC/DC 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
    • H02M3/22—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
    • H02M3/33571—Half-bridge at primary side of an isolation transformer
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • H01F2019/085—Transformer for galvanic isolation
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a converter device suitable for distributed photovoltaic, which is characterized in that every two adjacent LLC modules share a four-column magnetic core and surround the four-column magnetic core, the two LLC modules are isolated and symmetrical by a central shaft, the two LLC modules respectively form a winding structure similar to an 8-shaped winding, and the opposite magnetic induction directions of the adjacent magnetic columns are realized by combining a control mode of phase shifting 180 of the adjacent LLC modules. According to the invention, two LLC modules are integrated in a four-column magnetic core, cancellation of magnetic lines of force is realized through 8-like winding, the flux density is reduced, the efficiency is improved, and a better EMI characteristic is realized by combining a control mode of phase shifting 180 of adjacent LLC modules.

Description

Converter device suitable for distributed photovoltaic
Technical Field
The invention belongs to the technical field of converter devices, and particularly relates to a converter device suitable for distributed photovoltaic.
Background
In recent years, with the technological progress, the continuous breakthrough of the power electronic technology, the isolated converter device is widely applied in the technical field of new energy and distributed power generation, and the continuous breakthrough of the topological transformation technology and the application technology of a novel wide bandgap device, so that the high-efficiency and high-power density becomes the development direction of the power electronic device, especially the application requirements in the fields of distributed photovoltaic, wind power and other new energy power generation and energy storage, and the requirements on efficiency, volume and wide gain are severe. Traditional ISOP LLC topology has received much attention due to its good switching voltage stress and good EMI characteristics. However, the topological structure of the converter comprises a large number of transformers, which hinders the miniaturization and high-efficiency development of the converter. It is highly desirable to provide a miniaturized magnetic element integration and winding design method to improve the operating efficiency and power density of the converter.
CN211719418U discloses a high power density planar transformer, which is applied in a flyback power circuit, and includes: a rectangular magnetic core; the four-column magnetic core is parallel to the rectangular magnetic core, and a first magnetic column, a second magnetic column, a third magnetic column and a fourth magnetic column of the four-column magnetic core are all arranged on the same side of the four-column magnetic core and face the rectangular magnetic core; the primary winding is arranged between the rectangular magnetic core and the four-column magnetic core; the first secondary winding is arranged between the rectangular magnetic core and the primary winding; and the second secondary winding is arranged between the four-column magnetic core and the primary winding. The four-column magnetic core is adopted, and the primary winding is arranged between the first secondary winding and the second secondary winding in a laminating mode, so that the planar transformer is suitable for a multi-output flyback power circuit, and the power density of the planar transformer is improved. The integration mode of the series four-column magnetic core is suitable for LLC topology, but cannot be applied to ISOP LLC topology.
Disclosure of Invention
In order to solve the problems of large volume and high loss caused by multiple modules of the traditional ISOP LLC topology, the invention provides a converter device suitable for distributed photovoltaic.
The invention is realized by adopting the following technical scheme. Every two adjacent LLC modules share a four-column magnetic core and surround the four-column magnetic core, the two LLC modules are in isolation symmetry with a central axis, the two LLC modules form a winding structure similar to an 8-shaped winding, and the opposite magnetic induction directions of the adjacent magnetic columns are realized by combining a phase shift 180 control mode of the adjacent LLC modules.
Preferably, the winding structure of the 8-like winding is that the winding is divided into six sections, a first section of winding and a second section of winding, a fifth section of winding is a primary side one-layer winding, a third section of winding, a fourth section of winding and a sixth section of winding are primary side two-layer windings, the second section of winding and the third section of winding are connected in parallel through a via hole, the fifth section of winding and the sixth section of winding are connected in parallel through a via hole, and the parallel connection structure of the first section of winding, the second section of winding and the third section of winding, the parallel connection structure of the fourth section of winding, the fifth section of winding and the sixth section of winding are sequentially connected in series.
More preferably, the winding widths of the first and fourth windings are 2 times the winding widths of the second, third, fifth and sixth windings.
Further preferably, the two adjacent LLC modules are an LLC module i and an LLC module ii, and the winding manner of the winding in the form of the 8-like shape is specifically:
a winding of the LLC module I enters from a primary side layer wire inlet hole on the upper right of a first magnetic column, a first section winding of the LLC module I passes through a primary side layer gap between the first magnetic column and a second magnetic column and is connected with a second section winding surrounding the second magnetic column anticlockwise, the second section winding of the LLC module I enters from a primary side layer via hole on the lower left of the second magnetic column into a primary side second layer and is communicated with a third section winding of the LLC module I, the third section winding of the LLC module I surrounds the second magnetic column anticlockwise and then reaches the primary side second layer via hole on the upper left of the second magnetic column and is connected with the second section winding of the LLC module I, so that the parallel connection of the windings between the primary side layer and the primary side second layer is realized, the current is gathered on two layers of a primary side, then the fourth winding of an LLC module I is connected, the fourth winding of the LLC module I passes through a gap of the second layer of the primary side between a first magnetic column and a second magnetic column and then is connected with a fifth winding of the LLC module I in the first layer of the primary side through a via hole at the lower right of the first magnetic column and wound clockwise to the first magnetic column, the second layer of the primary side surrounds the sixth winding of the LLC module I on the first magnetic column clockwise, and the sixth winding of the LLC module I is connected with the fifth winding of the LLC module I in parallel through the via hole at the lower right of the first magnetic column and the via hole at the upper left of the first magnetic column and then flows out from a wire outlet hole at the upper part of the first magnetic column of the first layer of the primary side;
the winding of the primary side coil of the LLC module II enters from a primary side layer wire inlet hole on the lower right side of a third magnetic column, the first section winding of the LLC module II passes through a primary side layer gap between the third magnetic column and a fourth magnetic column and is connected with an LLC module II second section winding which clockwise surrounds the fourth magnetic column, the second section winding of the LLC module II enters from a primary side layer through hole on the upper left side of the fourth magnetic column and is communicated with an LLC module II third section winding, the LLC module II third section winding clockwise surrounds the fourth magnetic column and then reaches the primary side second section through hole on the lower left side of the fourth magnetic column and is connected with the LLC module II second section winding, the parallel connection of the primary side layer winding and the primary side second layer winding is realized, current is converged on the primary side second layer and is then connected with the LLC module II fourth section winding, the fourth section winding of the LLC module II passes through a primary side layer second layer gap between the third magnetic column and the fourth magnetic column and then is connected with a module LLC module II third section winding which anticlockwise winds on the third magnetic column and flows out from a LLC module II through hole on the upper right side of the third magnetic column and a LLC through hole of the third magnetic column.
Further preferably, the control mode of phase shift 180 of adjacent LLC modules means that the resonant currents of two LLC modules i are controlled in an interleaved manner, with a phase angle of 180 degrees between them.
Preferably, a four-layer PCB structure is adopted, the bottom layer PCB and the top layer PCB are used as secondary side coils, and the middle two layers of PCBs are used as primary side coils.
Preferably, the two adjacent LLC modules are an LLC module i and an LLC module ii, respectively; a half-bridge structure of an LLC module I is constructed by a first switch tube of the LLC module I and a second switch tube of the LLC module I, the first switch tube of the LLC module I and the second switch tube of the LLC module I are connected in series and then connected in parallel with a first resonant capacitor of the LLC module I and a second resonant capacitor of the LLC module I, one end of a resonant inductor of the LLC module I is connected in series with one end of an excitation inductor of the LLC module I, the other end of the resonant inductor of the LLC module I is connected between the first switch tube of the LLC module I and the second switch tube of the LLC module I, and the other end of the excitation inductor of the LLC module I is connected between the first resonant capacitor of the LLC module I and the second resonant capacitor of the LLC module I; II first switch tubes of LLC module and II second switch tubes of LLC module have constructed the half-bridge structure of LLC module II, II first switch tubes of LLC module and II second switch tubes of LLC module are parallelly connected with II first resonant capacitor of LLC module and II second resonant capacitor of LLC module after establishing ties, II resonant inductor's of LLC module one end and II excitation inductor's of LLC module one end are established ties, II resonant inductor's of LLC module other end is connected between II first switch tubes of LLC module and II second switch tubes of LLC module, II excitation inductor's of LLC module other end is connected between II first resonant capacitor of LLC module and II second resonant capacitor of LLC module.
Further preferably, the control mode of the adjacent LLC module phase shift 180 is: the turn-on period of a first switch tube of the LLC module I is 0-180 degrees, the turn-on period of a second switch tube of the LLC module I is 180-360 degrees, the turn-on period of a first switch tube of the LLC module II is 180-360 degrees, and the turn-on period of a second switch tube of the LLC module II is 0-180 degrees.
The invention has the beneficial effects that: the four-column type magnetic core shared by every two LLC module transformers and a winding mode of a specific symmetrical 8-shaped type are adopted, the magnetic density of a magnetic part is reduced by utilizing the principle of symmetrical cancellation of magnetic lines of force, the magnetic loss is reduced, the efficiency is improved, the magnetic densities of an upper magnetic plane and a lower magnetic plane are uniformly distributed, and the maximum peak value of the magnetic densities is effectively lower to be 1/2 of that of the traditional scheme. The invention can realize uniform distribution of current and magnetic density, effectively reduce maximum magnetic density, loss and volume, and improve the power density and operation efficiency of the converter.
The windings realize series-parallel connection of the full windings through the through holes, the line width of the 8-middle series part is 2 times of the line width of the two side parallel parts, current stress in the series direction of the full windings is consistent, the effective area is fully utilized through series-parallel connection, winding impedance is reduced, and winding loss is reduced. The parallel connection part forms different layers of input and output modes through the arrangement of the via holes, so that equivalent series impedance of a multi-path series-parallel circuit formed by different layers and the via holes is close to that of the multi-path series-parallel circuit, current is convenient to uniformly distribute, local electric stress pressure is reduced, local overheating is avoided, winding loss is reduced, and the operation efficiency of the converter is improved.
Drawings
FIG. 1 shows the turn ratio of two LLC modules according to the inventionnThe topology structure diagram is optimally designed by taking the ISOP LLC of 2 as an example.
FIG. 2 shows the present invention with two LLC modules, turns rationAnd the ISOP LLC of 2 is taken as an example to carry out an optimization effect diagram of magnetic piece integration.
FIG. 3 shows the turn ratio of two LLC modules according to the inventionnThe primary winding diagram is performed with an example of an ISOP LLC of 2.
FIG. 4 shows the turn ratio of two LLC modules according to the inventionnAn equivalent circuit diagram of the serial-parallel connection of the routing and the via holes is performed by taking the ISOP LLC of 2 as an example.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
Every two adjacent LLC modules share a four-column magnetic core and surround the four-column magnetic core, the two LLC modules are separated and symmetrical by a central shaft and form 8-like winding wires respectively, and the opposite magnetic induction directions of the adjacent magnetic columns are realized by combining a phase shift 180 control mode of the adjacent LLC modules.
In this embodiment, two LLC modules and an iso LLC with a turn ratio of 2 are taken as an example to describe, a four-layer PCB structure is adopted, a bottom layer PCB and a top layer PCB are used as secondary coils, a middle two-layer PCB is used as a primary coil, and a specific topology structure of the iso LLC is shown in fig. 1. LLC module I first switch tube Q 11 And LLC module I second switch tube Q 12 A half-bridge structure of an LLC module I is constructed, and a first switch tube Q of the LLC module I 11 And LLC module I second switch tube Q 12 First resonant capacitor connected in series with LLC module IC 11 And LLC module I second resonance capacitorC 12 Parallel LLC module I resonant inductorL r1 One end of the inductor is connected with an excitation inductor of the LLC module IL m1 One end of the inductor is connected in series, and the LLC module I is a resonant inductorL r1 The other end of the second switch is connected with a first switch tube Q of the LLC module I 11 And LLC module I second switch tube Q 12 Between LLC module I excitation inductanceL m1 Is connected to the first resonant capacitor of LLC module IC 11 And LLC module I second resonance capacitorC 12 In the middle of; LLC module II first switch tube Q 21 And LLC module II second switch tube Q 22 A half-bridge structure of an LLC module II is constructed, and a first switch tube Q of the LLC module II 21 And LLC module II second switch tube Q 22 After being connected in series, the first resonant capacitor is connected with the LLC module IIC 21 And LLC module II second resonance capacitorC 22 Parallel LLC module II resonance inductorL r2 One end of the inductor is connected with an LLC module II excitation inductorL m2 One end of the LLC module is connected in series, and the LLC module II resonance inductorL r2 Is connected to the first switch tube Q of the LLC module II 21 And LLC module II second switch tube Q 22 Between LLC module II excitation inductanceL m2 Is connected to the first resonant capacitor of LLC module IIC 21 And LLC module II second resonance capacitorC 22 In the middle of; LLC module I excitation inductanceL m1 In the presence of an excitation current of LLC module Ii m1 LLC module II excitation inductorL m1 In the presence of LLC dieBlock I excitation currenti m2 Resonant current of LLC module Ii r1 Resonant current with LLC module IIi r2 The control is staggered, and the two are different in phase angle of 180 degrees, thereby improving the EMI characteristic. As can be seen from fig. 1, the transformers of LLC module i and LLC module ii share the same magnetic core. In the context of figure 1 of the drawings,V in in order to input the voltage, the voltage is,v sec1 is the secondary side output voltage of the transformer of the LLC module I,i s1 secondary side output current, SR, of transformer for LLC module I 11 ，SR 12 ，SR 13 ，SR 14 First, second, third and fourth rectifier switch tubes C of LLC module I respectively o For outputting voltage-stabilizing capacitors, R L In order to be the load,v sec2 is the secondary side output voltage of the transformer of the LLC module II,i s2 secondary side output current, SR, of transformer for LLC module II 21 ，SR 22 ，SR 23 ，SR 24 The LLC module II comprises a first rectifying switch tube, a second rectifying switch tube, a third rectifying switch tube and a fourth rectifying switch tube.
In this embodiment, the control mode of the adjacent LLC module phase shift 180 is: assuming that the dead zone is ignored, the LLC module I first switch tube Q 11 The turn-on period is 0-180 degrees, and the LLC module I is provided with a second switch tube Q 12 The turn-on period is 180-360 degrees, and the corresponding switch tube of the LLC module II is 180 degrees different from the turn-on period of the LLC module I, namely the first switch tube Q of the LLC module II 21 The turn-on period is 180-360 degrees, and the LLC module II is provided with a second switch tube Q 22 The turn-on period is 0-180 deg.
In fig. 2, the present embodiment can integrate two discrete magnetic core groups by using a four-column type common magnetic core. The four-column type shared magnetic core comprises a first magnetic column 1, a second magnetic column 2, a third magnetic column 3 and a fourth magnetic column 4, wherein the upper end and the lower end of the first magnetic column 1 and the upper end and the lower end of the second magnetic column 2 are connected through an upper magnetic plane 5 and a lower magnetic plane 5 to form a first magnetic core group; the upper ends and the lower ends of the third magnetic column 3 and the fourth magnetic column 4 are connected through an upper magnetic plane 5 and a lower magnetic plane 5 to form a second magnetic core group; the first magnetic core group and the second magnetic core group are integrated together in a way that adjacent magnetic columns form opposite magnetic induction directions, so that uniform magnetic density distribution is realized on the magnetic plane 5, and the magnetic pole is formed byMagnetic densityϕReduced to magnetic densityϕ The magnetic part volume can be effectively reduced, the magnetic core loss is reduced, and the efficiency is improved.
Referring to fig. 3, a specific PCB wiring method is explained by using a primary coil of an LLC module i: A winding of a primary coil of an LLC module I enters from a primary side layer wire inlet 6a on the upper right of a first magnetic column, a first section winding 7a1 of the LLC module I passes through a primary side layer gap between the first magnetic column 1 and a second magnetic column 2, a second section winding 7a2 surrounding the second magnetic column 2 anticlockwise is connected, the second section winding 7a2 of the LLC module I enters from a primary side layer through hole 8a1 on the lower left of the second magnetic column 2 to a primary side layer to be communicated with a third section winding 7a3 of the LLC module I, the third section winding 7a3 of the LLC module I surrounds the second magnetic column 2 anticlockwise to reach the second section winding 7a2 on the upper left of the second magnetic column 2 and is connected with the second section winding 7a2 of the LLC module I, the parallel connection of the windings between the primary side layer and the primary side layer is realized, current is converged between the primary side layer and the primary side layer, then the fourth section winding 7a4 of the LLC module I passes through a primary side layer through a first layer through hole 8a2 on the first magnetic column 1 and a second layer through hole 7a1 on the right magnetic column, and the second magnetic column winding, and the second section winding 7a2, and the LLC module I passes through a first layer through hole 8a1, and a hole 7a3, and a5 a2, and a first horizontal through a hole, and a first winding on the first magnetic column.
The corresponding PCB wiring mode of the LLC module II is similar to that of the LLC module I, a winding of a primary coil of the LLC module II enters from a primary side layer wire inlet 6b at the lower right of a third magnetic column, a first section winding 7b1 of the LLC module II passes through a primary side layer gap between the third magnetic column 3 and a fourth magnetic column 4, a second section winding 7b2 of the LLC module II which clockwise surrounds the fourth magnetic column 4 is connected, a second section winding 7b2 of the LLC module II enters from a primary side layer through hole 8b1 at the upper left of the fourth magnetic column 4 to a primary side second layer and is communicated with the third section winding 7b3 of the LLC module II, a third section winding 7b3 of the LLC module II clockwise surrounds the fourth magnetic column 4 and then reaches a second layer through hole 8b2 of the primary side at the lower left of the fourth magnetic column 4 to be connected with the second section winding 7b2 of the LLC module II, the parallel connection of the first layer of primary winding and the second layer of primary winding is realized, current is gathered on the second layer of primary winding, then the first layer of LLC module II fourth winding 7b4 is connected, the second layer of LLC module II fourth winding 7b4 passes through a gap between the third magnetic column 3 and the fourth magnetic column 4 and then passes through a via hole 8b3 on the right upper side of the third magnetic column 3 to be connected with the second section of LLC module II fifth winding 7b5 wound around the third magnetic column 3 counterclockwise in the first layer of primary winding, and the second layer of primary winding reverse clock is wound around the second section of LLC winding 7b6 on the third magnetic column 3 and then passes through a via hole 8b3 on the right upper side of the third magnetic column 3 and a via hole 8b4 on the left lower side of the third magnetic column 3 to be connected with the second section of LLC module II fifth winding 7b5 in parallel connection and then flows out from an outlet hole 9b on the lower side of the third magnetic column 3 of the first layer of primary winding.
Fig. 4 shows a winding equivalent impedance circuit of a primary coil of the LLC module i, where the windings form a cross-layer series-parallel structure according to the via holes, and the current directions are as shown by the arrow directions, and the directions of the induced magnetic fields of adjacent magnetic columns are opposite. Meanwhile, through a winding mode similar to a 8 shape, in order to guarantee current sharing in different layers and consider the impedance of a via hole, a mode that different layers enter and exit in parallel stages is adopted, in fig. 4, a first-section winding 7a1 of an LLC module I, a second-section winding 7a2 of the LLC module I, a fifth-section winding 7a5 of the LLC module I are primary-side one-layer windings, a third-section winding 7a3 of the LLC module I, a fourth-section winding 7a4 of the LLC module I and a sixth-section winding 7a6 of the LLC module I are primary-side two-layer windings, a second-section winding 7a2 of the LLC module I and a third-section winding 7a3 of the LLC module I are connected in parallel, a fifth-section winding 7a5 of the LLC module I and a sixth-section winding 7a6 of the LLC module I are connected in parallel, a parallel structure of a first-section winding 7a1 of the LLC module I, a second-section winding 7a2 of the LLC module I and a third-section winding 7a3 of the LLC module I, a parallel structure of the fourth-section winding 7a4 of the LLC module I, a fifth-section winding 7a5 of the LLC module and a parallel connection structure of the LLC module I7 a6 are sequentially connected in series. On the other hand, in order to ensure that the windings have uniform current stress, the winding widths of the first-section winding 7a1 of the LLC module I and the fourth-section winding 7a4 of the LLC module I are 2 times that of the second-section winding 7a2 of the LLC module I, the third-section winding 7a3 of the LLC module I, the fifth-section winding 7a5 of the LLC module I and the sixth-section winding 7a6 of the LLC module I, so that unequal-width winding is constructed to obtain optimized winding impedance, the winding loss of the transformer is improved, and the overall operation efficiency is improved. LLC module II is similar to LLC module I, and no longer repeated.
It should be understood that the foregoing description is of specific embodiments and not intended to limit the scope of the invention, which is defined by the claims appended hereto.

Claims (6)

1. A converter suitable for distributed photovoltaic is characterized in that every two adjacent LLC modules share a four-column magnetic core and surround the four-column magnetic core, the two LLC modules are isolated and symmetrical by a central shaft, the two LLC modules form a winding structure similar to an 8-shaped winding respectively, and the opposite magnetic induction directions of the adjacent magnetic columns are realized by combining a control mode of phase shifting 180 of the adjacent LLC modules;
the 8-shaped winding structure comprises a winding divided into six sections, namely a first section of winding and a second section of winding, wherein the fifth section of winding is a primary side one-layer winding, the third section of winding, the fourth section of winding and the sixth section of winding are primary side two-layer windings, the second section of winding and the third section of winding are connected in parallel through a through hole, the fifth section of winding and the sixth section of winding are connected in parallel through a through hole, and the parallel connection structure of the first section of winding, the second section of winding and the third section of winding, the parallel connection structure of the fourth section of winding, the fifth section of winding and the sixth section of winding are sequentially connected in series; the winding widths of the first section of winding and the fourth section of winding are 2 times of the winding widths of the second section of winding, the third section of winding, the fifth section of winding and the sixth section of winding.
2. The converter device suitable for distributed photovoltaics according to claim 1, wherein the two adjacent LLC modules are LLC module i and LLC module ii, and the winding mode of the class "8" type winding is specifically:
a winding of the LLC module I enters from a primary side layer wire inlet hole on the upper right of a first magnetic column, a first section of winding of the LLC module I passes through a primary side layer gap between the first magnetic column and a second magnetic column and is connected with a second section of winding which anticlockwise surrounds the second magnetic column, the second section of winding of the LLC module I enters from a primary side layer through hole on the lower left of the second magnetic column to a primary side second layer and is communicated with a third section of winding of the LLC module I, the third section of winding of the LLC module I anticlockwise surrounds the second magnetic column and then reaches the upper left of the second magnetic column, the primary side layer through hole is connected with the second section of winding of the LLC module I, and the parallel connection of the winding between the primary side layer and the primary side layer is realized, the current is gathered on two layers of a primary side, then the fourth winding of an LLC module I is connected, the fourth winding of the LLC module I passes through a gap of the second layer of the primary side between a first magnetic column and a second magnetic column and then is connected with a fifth winding of the LLC module I in the first layer of the primary side through a via hole at the lower right of the first magnetic column and wound clockwise to the first magnetic column, the second layer of the primary side surrounds the sixth winding of the LLC module I on the first magnetic column clockwise, and the sixth winding of the LLC module I is connected with the fifth winding of the LLC module I in parallel through the via hole at the lower right of the first magnetic column and the via hole at the upper left of the first magnetic column and then flows out from a wire outlet hole at the upper part of the first magnetic column of the first layer of the primary side;
a winding of a primary side coil of an LLC module II enters from a primary side layer wire inlet hole on the lower right side of a third magnetic column, a first section winding of the LLC module II passes through a primary side layer gap between the third magnetic column and a fourth magnetic column and is connected with an LLC module II second section winding which clockwise surrounds the fourth magnetic column, the LLC module II second section winding enters from a primary side layer through hole on the upper left side of the fourth magnetic column and is communicated with an LLC module II third section winding, the LLC module II third section winding clockwise surrounds the fourth magnetic column and then reaches the primary side layer through hole on the lower left side of the fourth magnetic column and is connected with the LLC module II second section winding, parallel connection of the primary side layer winding and the primary side layer winding is achieved, current is gathered on the primary side layer two, then the LLC module II fourth section winding is connected with the LLC module II fourth section winding, the LLC module II fourth section winding passes through a primary side layer gap between the third magnetic column and the fourth magnetic column and then is connected with a layer through a primary side layer through hole on the upper right side of the third magnetic column, a layer through hole in the layer, a layer winding in the first layer is connected with a layer winding in the first layer, the LLC module II winding around the third magnetic column, and the LLC column through hole on the third magnetic column, and the third layer through a second section winding, and the LLC module II through hole on the upper right side layer through hole on the third magnetic column, and the second layer of the third magnetic column, and the second section winding, and the LLC left side of the second section winding, and the second winding of the second winding in parallel connection of the third magnetic column, and then the LLC module II are connected with the third column, and the third layer of the third column, and the second winding in parallel connection of the third column, and the LLC module II.
3. The converter device according to claim 1, wherein the control mode of phase shifting 180 between two adjacent LLC modules is a control of the resonant currents of two LLC modules in a staggered manner, with a phase angle of 180 degrees.
4. The converter device according to claim 1, wherein a four-layer PCB structure is adopted, the bottom and top PCBs are secondary windings, and the middle two PCBs are primary windings.
5. The converter device suitable for distributed photovoltaics according to claim 1, wherein two adjacent LLC modules are LLC module i and LLC module ii, respectively; the half-bridge structure of the LLC module I is constructed by a first switch tube of the LLC module I and a second switch tube of the LLC module I, the first switch tube of the LLC module I and the second switch tube of the LLC module I are connected in series and then connected in parallel with a first resonant capacitor of the LLC module I and a second resonant capacitor of the LLC module I, one end of a resonant inductor of the LLC module I is connected in series with one end of an excitation inductor of the LLC module I, the other end of the resonant inductor of the LLC module I is connected between the first switch tube of the LLC module I and the second switch tube of the LLC module I, and the other end of the excitation inductor of the LLC module I is connected between the first resonant capacitor of the LLC module I and the second resonant capacitor of the LLC module I; the half-bridge structure of LLC module II has been constructed to II first switch tubes of LLC module and II second switch tubes of LLC module, connect in parallel with II first resonant capacitor of LLC module and II second resonant capacitor of LLC module after II first switch tubes of LLC module and II second switch tubes of LLC module establish ties, the one end of II resonant inductor of LLC module establishes ties with II one end of exciting the inductance of LLC module, the other end of II resonant inductor of LLC module is connected between II first switch tubes of LLC module and II second switch tubes of LLC module, the other end of II exciting inductors of LLC module is connected between II first resonant capacitor of LLC module and II second resonant capacitor of LLC module.
6. The converter device suitable for distributed photovoltaics according to claim 5, wherein the control mode of the adjacent LLC module phase shift 180 is: the turn-on period of a first switch tube of the LLC module I is 0-180 degrees, the turn-on period of a second switch tube of the LLC module I is 180-360 degrees, the turn-on period of a first switch tube of the LLC module II is 180-360 degrees, and the turn-on period of a second switch tube of the LLC module II is 0-180 degrees.
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Publication number Priority date Publication date Assignee Title
WO2018077230A1 (en) * 2016-10-27 2018-05-03 深圳市优优绿能电气有限公司 Llc resonant converter having high-voltage output
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CN114710058A (en) * 2022-04-12 2022-07-05 南京航空航天大学 Resonant inductor and transformer magnetic core integration method suitable for bidirectional resonant converter

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CN107017780B (en) * 2017-05-31 2019-05-10 青岛大学 A kind of the isolated form DC-DC boost converter and its control method of band pull-up active clamp branch
CN108122664A (en) * 2018-02-08 2018-06-05 东南大学 Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates
CN110677047B (en) * 2019-09-30 2021-08-06 西安电子科技大学 LLC resonant converter based on variable inductance
CN111669058A (en) * 2020-05-26 2020-09-15 中国科学院电工研究所 Three-phase CLLC bidirectional DC converter and control method thereof

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Publication number Priority date Publication date Assignee Title
WO2018077230A1 (en) * 2016-10-27 2018-05-03 深圳市优优绿能电气有限公司 Llc resonant converter having high-voltage output
CN113809904A (en) * 2021-09-28 2021-12-17 天津大学 Matrix transformer based on LLC resonant converter topology magnetic integration
CN114710058A (en) * 2022-04-12 2022-07-05 南京航空航天大学 Resonant inductor and transformer magnetic core integration method suitable for bidirectional resonant converter

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