CN108122664A - Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates - Google Patents

Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates Download PDF

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Publication number
CN108122664A
CN108122664A CN201810129632.6A CN201810129632A CN108122664A CN 108122664 A CN108122664 A CN 108122664A CN 201810129632 A CN201810129632 A CN 201810129632A CN 108122664 A CN108122664 A CN 108122664A
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CN
China
Prior art keywords
side winding
primary side
vice
switching tube
synchronous rectifier
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CN201810129632.6A
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Chinese (zh)
Inventor
孙伟锋
田豪傑
张森
肖金玉
苏巍
刘琦
时龙兴
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Southeast University
CSMC Technologies Corp
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Southeast University
CSMC Technologies Corp
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Priority to CN201810129632.6A priority Critical patent/CN108122664A/en
Publication of CN108122664A publication Critical patent/CN108122664A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • 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
    • 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
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • 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
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—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 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
    • H02P13/06—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changing; by rearranging interconnections of windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F2038/006—Adaptations of transformers or inductances for specific applications or functions matrix transformer consisting of several interconnected individual transformers working as a whole
    • 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
    • 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

Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates,Suitable for the LLC half bridge resonant under MHz switching frequencies,Including four discrete transformers,Each transformer sets the centre cap vice-side winding with the primary side winding symmetrical coupled there are one primary side winding and one,It connects between the primary side winding of four discrete transformers,It is in parallel between the centre cap vice-side winding of each primary side winding symmetrical coupled,A primary side winding control switching tube in parallel in each primary side winding,And it is integrated with respective resonant inductance and magnetizing inductance in LLC resonant converter in each primary side winding,Respective two synchronous rectifiers and two output capacitances are integrated on each vice-side winding,The operating mode of synchronous rectifier is influenced by primary side winding control switching tube,By the way that primary side winding is controlled to control the effective turn for opening with shut-off to change primary side winding of switching tube,And then adjust the turn ratio of former vice-side winding.

Description

Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates
Technical field
Matrix is adjusted the present invention relates to the turn ratio that a kind of matrix transformer more particularly to a kind of synchronous rectifier integrate to become Matrix transformer is adjusted in depressor, the high frequency that can be applied in LLC half bridge resonant.
Background technology
Controlled resonant converter is a kind of burning hoter power inverter of current research, compared with pwm converter, has switch Frequency is high, and it is excellent that switching loss is small, allow wide input voltage range, efficient, small, EMI noise is small, switch stress is small etc. Point.LLC resonant converter can realize that the no-voltage of primary side switch pipe opens (ZVS) and secondary rectifying tube in full-load range Zero Current Switch (ZCS) so that switching loss is greatly reduced, can be operated in very high frequency (>5MHz).LLC resonance Resonant inductance and transformer in converter are easily achieved magnetic element and integrate, and LLC resonant converter does not have the filter of secondary Ripple inductance so that the voltage stress of secondary rectification reduces.With reference to more than advantage so that LLC resonant converter has been applied in perhaps More occasions, the particularly occasion in low output voltage and High Output Current.
Planarization and it is integrated be the most important trend of power transformer, contribute to reduce volume, reduce loss and it is excellent Change heat distribution etc..Planarization is using lower moulding, is more conducive to the plane magnetic core to radiate, using in printed circuit board (PCB) (PCB) Compact copper wire replaces the circular copper wire of conventional power transformer, substantially reduces the volume of power transformer, while reduces height The A.C.power loss of the lower winding of frequency.Integrated is the core structure and winding construction for making full use of power transformer, is realized one In a magnetic core can the magnetic elements such as integrated transformer, inductance, further reduce the volume shared by magnetic element.
For high step-down ratio LLC resonant converter, the loss of power transformer determines the loss of entire converter, therefore The design of power transformer is particularly significant.Using flat surface transformer, primary side winding series connection, vice-side winding is in parallel, although power becomes The loss of depressor substantially reduces, but actually the vice-side winding of power transformer still has bigger loss, and is dropped in height The pressure ratio occasion original vice-side winding turn ratio is larger, and common four laminate cannot be met the requirements, it is necessary to which the pcb board of more numbers of plies, this will Cost can be greatly increased.
Matrix transformer can regard the set of multiple transformers as, can neatly change in actual use primary side around Group, the connection in series-parallel relation of vice-side winding, adjust the required turn ratio, are quite suitable for high step-down ratio, output low-voltage, high-current field It closes.
The content of the invention
Square is adjusted in the turn ratio integrated the present invention seeks to be directed to a kind of synchronous rectifier of LLC half bridge resonant offer Battle array transformer.
To achieve the above object, the present invention adopts the following technical scheme that：The turn ratio that a kind of synchronous rectifier integrates is adjusted Matrix transformer, the synchronous rectification LLC resonant converter applied to half-bridge structure, it is characterised in that：Including four discrete changes Depressor, each transformer set there are one the centre cap secondary of primary side winding and one and the primary side winding symmetrical coupled around Group is connected between the primary side winding of four discrete transformers, the centre cap vice-side winding with each primary side winding symmetrical coupled Between in parallel, a primary side winding control switching tube in parallel in each primary side winding, and integrated in each primary side winding Respective resonant inductance and magnetizing inductance in LLC resonant converter, be integrated on each vice-side winding respective two it is same Rectifying tube and two output capacitances are walked, the operating mode of synchronous rectifier is influenced by primary side winding control switching tube, passes through control Primary side winding control switching tube processed opens with shut-off to change the effective turn of primary side winding, and then adjusts former vice-side winding The turn ratio.
The number of turn of four primary side windings in four discrete transformers is respectively NP1、NP2、NP3And NP4, NP1=NP2 =NP3=NP4=NP, resonant inductance L is respectively provided in four primary side winding circuitsrWith magnetizing inductance Lm, each primary side winding circuit In resonant inductance LrOne end connect in the primary side winding circuit control switching tube drain electrode, resonant inductance LrThe other end connect Meet magnetizing inductance LmOne end and the primary side winding circuit in primary side winding Same Name of Ends, primary side winding different name end connection excitation Inductance LmThe other end and the primary side winding circuit in control switching tube source electrode, the control switching tube in parallel with each primary side winding Respectively S1、S2、S3、S4, control switching tube S1Source electrode connection control switching tube S2Drain electrode, control switching tube S2Source electrode connect Meet control switching tube S3Drain electrode, control switching tube S3Source electrode connection control switching tube S4Drain electrode, control switching tube S4Source Pole connection primary side ground GND_P, control switching tube S1Drain electrode pass through resonant capacitance CrConnect the output terminal HB of primary side power tube；Four The number of turn of a centre cap vice-side winding is respectively NSa1And NSb1；NSa2And NSb2；NSa3And NSb3And NSa4And NSb4, NSa1=NSb1 =NSa2=NSb2=NSa3=NSb3=NSa4=NSb4=NS, it is whole that two synchronizations are respectively provided in each centre cap vice-side winding circuit Flow tube M and two output capacitance CO, the Same Name of Ends connected in 1/2 vice-side winding of centre cap that drains of a synchronous rectifier M, The source electrode of synchronous rectifier M connects an output capacitance COOne end, output capacitance COThe other end with another output electricity Hold COThe source electrode of another synchronous rectifier M is connected after series connection, the drain electrode of synchronous rectifier M connection centre cap another 1/ Different name end in 2 vice-side windings, the Same Name of Ends of 1/2 vice-side winding connect the different name end in previous 1/2 vice-side winding and make Centered on tap connect two output capacitance COSeries connection end, the centre cap of four centre cap vice-side windings links together As the output terminal of output voltage Vo, two output capacitance C in four centre cap vice-side winding circuitsONon- series connection end connect It is connected together and with connecting secondary GND_S.
Control switching tube in each primary side winding circuit and the centre cap vice-side winding circuit with its symmetrical coupled In synchronous rectifier correspond to it is as follows：Control switching tube S1Corresponding synchronous rectifier M1And M2；Control switching tube S2It is corresponding synchronous whole Flow tube M3And M4；Control switching tube S3Corresponding synchronous rectifier M5And M6；Control switching tube S4Corresponding synchronous rectifier M7And M8；Control Priority when switching tube processed is opened is S4>S3>S2>S1, priority during shut-off is S1>S2>S3>S4；
The effective turn for opening with shut-off to change primary side winding by controlling primary side winding control pipe, and then tune The turn ratio of the former vice-side winding of section, specially：
S1~S4During shut-off, the effective turn of primary side winding is NP1+NP2+NP3+NP4, i.e. 4NP；
S1~S3Shut-off, S4When opening, the effective turn of primary side winding is NP1+NP2+NP3, i.e. 3NP；
S1、S2Shut-off, S3、S4When opening, the effective turn of primary side winding is NP1+NP2, i.e. 2NP；
S1Shut-off, S2~S4When opening, the effective turn of primary side winding is NP；
S1~S4When opening, the effective turn of primary side winding is 0, therefore forbids S1~S4It is open-minded,
It is above-mentioned it is various in the case of, the effective turn of vice-side winding is always NS；
The synchronous rectifier M1~M8Operating mode influenced by primary side winding control pipe, be specially：
S1~S4During shut-off, M1~M8Normal work；
S1~S3Shut-off, S4When opening, M1~M6Normal work, M7~M8Grid are driven to low level, do not work；
S1、S2Shut-off, S3、S4When opening, M1~M4Normal work, M5~M8Grid are driven to low level, do not work；
S1Shut-off, S2~S4When opening, M1、M2Normal work, M3~M8Grid are driven to low level, do not work.
The number of turn N of four primary side windingsP1=NP2=NP3=NP4=NP, take NP=4, four centre cap secondary around The number of turn N of groupSa1=NSb1=NSa2=NSb2=NSa3=NSb3=NSa4=NSb4=NS, take NS=1.
The model encapsulation all same of control switching tube in each primary side winding circuit, each centre cap vice-side winding return The model encapsulation all same of synchronous rectifier in road, output capacitance COModel encapsulation all same.
Magnetic core quantity n>1, take n=4.
The flat surface transformer that the matrix transformer is made of four layers of pcb board, thickness of slab 1.5mm, each layer copper foil copper are thick It is 2oz, the thickness of insulating layer between each layer is 0.35mm, and winding is distributed as：First layer, the 4th layer of placement vice-side winding, The second layer, third layer place primary side winding, and magnetic core selects UI shapes, and core material selects 3F46.
The invention has the advantages that and remarkable result：
1st, the present invention is compared with classical matrix transformer, the method by adding primary side winding control pipe in primary side winding, It realizes that the turn ratio of former vice-side winding is adjusted, while synchronous rectifier and output capacitance is integrated in vice-side winding, reduce pair Side terminal loss, suitable for high step-down ratio, output low-voltage, high-current LLC half bridge resonant.
2nd, matrix transformer integrated level height is adjusted in the turn ratio that synchronous rectifier of the present invention integrates, and power density is high.It is not The resonant inductance and magnetizing inductance being only integrated in LLC half bridge resonant, be also further integrated with synchronous rectifier with it is defeated Go out capacitance.
3rd, the present invention can flexible modulation original vice-side winding the turn ratio.Under wide input voltage occasion, by adjusting former secondary The turn ratio of winding, makes LLC half bridge resonant always work in resonance point, can keep highest transfer efficiency.
4th, present invention control is simple, and the drive signal of primary side winding control pipe is generated by peripheral control unit, and is opened and closed It is disconnected to have priority orders, so that it is guaranteed that the drive signal of each control pipe is with being all based on primary side, and secondary synchronous rectifier Operating mode is influenced by primary side winding control pipe, ensures reliable and stable work.
5th, the present invention is especially suitable for high step-down ratio, output low pressure, the high current occasion under MHz switching frequencies, can be used Four layers of pcb board, at low cost, easily fabricated, parameter consistency is good.
Description of the drawings
Fig. 1 is LLC half bridge resonant topology diagram using the present invention；
Fig. 2 is the single discrete transformer PCB domains of the present invention；
Fig. 3 is the single discrete transformer winding distribution cross-sectional view of the present invention；
Fig. 4 is the present example course of work.
Specific embodiment
The technical solution of invention is described in detail below in conjunction with the accompanying drawings.
Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier of the present invention integrates, and provides a kind of turn ratio and matrix is adjusted Design of transformer method is low-voltage, high-current field suitable for LLC half bridge resonant, particularly wide input voltage and output It closes.The former secondary number of turn, magnetic core number and the pcb board number of plies can be determined according to concrete application in practice.
As shown in Figure 1, matrix transformer magnetic core quantity n=4 is adjusted in the turn ratio that a kind of synchronous rectifier integrates, by four Discrete transformer is formed.The present invention provides a kind of design method, theoretically magnetic core quantity n>1, it can actually select as needed Select suitable magnetic core quantity.
As shown in Figure 1, the half-bridge of matrix transformer is adjusted in the turn ratio to be integrated using a kind of synchronous rectifier of the present invention LLC resonant converter topology diagram.Wherein, VIN、VORespectively input voltage and output voltage, CINFor input capacitance, CrFor Resonant capacitance, Q1、Q2For primary side power tube, for primary side, GND_S is for secondary by GND_P.S1~S4For primary side winding control pipe, H1~H4Respectively primary side winding control pipe S1~S4Drain electrode.Lr1~Lr4For the leakage inductance of single discrete transformer, Lm1~Lm4For The magnetizing inductance of single discrete transformer, NP1~NP4For the number of turn of single discrete transformer primary side winding, NSa1~NSa4And NSb1 ~NSb4For the number of turn of single discrete transformer vice-side winding, M1~M8For synchronous rectifier, CO1~CO8For output capacitance.
As shown in Figure 1, it is of the invention compared with classical matrix transformer, in the primary side winding of each discrete transformer simultaneously A primary side winding control pipe is joined, by the way that opening for primary side winding control pipe is controlled to change the effective of primary side winding with shut-off The number of turn, and then adjust the turn ratio of former vice-side winding.Synchronous rectifier and output capacitance are integrated in vice-side winding simultaneously, is reduced It is lost caused by being terminated due to secondary.
As shown in Figure 1, the number of turn of the primary side winding of single discrete transformer meets：NP1=NP2=NP3=NP4=NP, and it is secondary The number of turn of side winding meets：NSa1=NSb1=NSa2=NSb2=NSa3=NSb3=NSa4=NSb4=NS.N in present exampleP=4, NS=1, since the primary side winding of four discrete transformers is series relationship, and vice-side winding is parallel relationship, therefore the present invention The turn ratio of example original vice-side winding is up to 16:1:1.
As shown in Figure 1, primary side winding control pipe is by metal-oxide-semiconductor S1、S2、S3、S4Composition, and S1、S2、S3、S4Model encapsulation is homogeneous Together, it is in parallel with the primary side winding of single discrete transformer respectively, and metal-oxide-semiconductor S4Source electrode with connecing primary side GND_P, S3Source electrode connect S4Drain electrode, S2Source electrode meet S3Drain electrode, S1Source electrode meet S2Drain electrode, S1Drain electrode meet CrOne end.Synchronous rectifier M1~ M8With output capacitance CO1~CO8It is integrated in vice-side winding, and synchronous rectifier M1~M8Model encapsulates all same, output capacitance CO1 ~CO8Model encapsulates all same.
As shown in Figure 1, the effective turn for opening with shut-off to change primary side winding by controlling primary side winding control pipe, And then adjust the turn ratio of former vice-side winding.Specially：
S1~S4When being turned off, the effective turn of primary side winding is NP1+NP2+NP3+NP4, i.e. 4NP。
S1~S3It is turned off, S4When opening, the effective turn of primary side winding is NP1+NP2+NP3, i.e. 3NP。
S1、S2Shut-off, S3、S4When opening, the effective turn of primary side winding is NP1+NP2, i.e. 2NP。
S1Shut-off, S2~S4When opening, the effective turn of primary side winding is NP。
S1~S4When opening, the effective turn of primary side winding is 0, therefore forbids S1~S4It is open-minded.
Wherein, the effective turn of vice-side winding is always NS。
As shown in Figure 1, the operating mode of synchronous rectifier is influenced by primary side winding control pipe.Specially：
S1~S4When being turned off, M1~M8Normal work.
S1~S3It is turned off, S4When opening, M1~M6Normal work, M7~M8Grid are driven to low level, do not work.
S1、S2Shut-off, S3、S4When opening, M1~M4Normal work, M5~M8Grid are driven to low level, do not work.
S1Shut-off, S2~S4When opening, M1、M2Normal work, M3~M8Grid are driven to low level, do not work.
As shown in Figure 1, primary side winding is integrated with the resonant inductance in LLC half bridge resonant, and the value of resonant inductance For Lr1+Lr2+Lr3+Lr4.Meanwhile primary side winding is also integrated with the magnetizing inductance in LLC half bridge resonant, magnetizing inductance It is worth for Lm1+Lm2+Lm3+Lm4。
As shown in Fig. 2, the example that matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier of the present invention integrates uses four Layer pcb board, magnetic core select UI shapes, and core material selects 3F46.
As shown in Fig. 2, in the present invention close to primary side one side single discrete transformer PCB domains.Fig. 2 gives this The H4 of single discrete transformer primary side winding, GND_P endpoints, primary side winding control pipe S in parallel in primary side winding4, UI magnetic cores Core, synchronous rectifier SR, output capacitance CO, output voltage terminal VOAnd via V1, V2, V3.H4 is S4Drain electrode and point The electric connecting point of vertical transformer primary side windings in series, GND_P for primary side, primary side winding control pipe in parallel in primary side winding S4, output capacitance Co and synchronous rectifier SR be attached to pcb board surface, there is electrical connection to close with PCB first layers, the 4th layer System.S4One termination H4, a termination GND_P, is parallel relationship with primary side winding.Core is the position of UI magnetic cores in Fig. 2.V1 is One layer of via being connected with the second layer, V2 are the via that first layer is connected with third layer, and V3 is what the second layer was connected with third layer Via.Primary side winding on the second layer, third layer is using 2 circle copper foil windings counter clockwise direction coilings, first layer, on the 4th layer Vice-side winding uses 1 circle copper foil winding technique.H4 is electrically connected by via V1 and second layer primary side winding, second layer primary side around Group is 2 circles, and is connected by via V3 with third layer primary side winding.Third layer primary side winding is 2 circles, passes through via V2 and primary side Ground GND_P is electrically connected.Synchronous rectifier SR includes M in Fig. 27、M8, source electrode with connecing secondary GND_S.Output capacitance Co one sides Meet output voltage Vo, side joint secondary ground GND_S.
As shown in Fig. 2, single discrete transformer in matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates Primary side winding and vice-side winding are not in same layer coiling, and the facing area between former vice-side winding is zero, therefore former secondary It there's almost no parasitic capacitance between winding, there's almost no Conducted EMI problem.
As shown in Fig. 2, since transformer uses compact winding construction so that the coupling of former secondary is very close, works as work When working frequency reaches MHz, requirement of the resonant network for resonant inductance only has several uH, even less than 1 uH, therefore can be with By the use of transformer leakage inductance as resonant network resonant inductance.
As shown in figure 3, single discrete transformer in matrix transformer is adjusted for the turn ratio that a kind of synchronous rectifier integrates Winding distribution cross-sectional view.Present example uses four layers of pcb board, and thickness of slab 1.5mm, each layer copper foil copper thickness is 2oz, each layer Between thickness of insulating layer for 0.35mm, winding is distributed as：Secondary (Sa)-primary side (P)-primary side (P)-secondary (Sb).Institute It is because being so more convenient for integrated synchronous rectifying tube and output capacitance to place vice-side winding in first layer, the 4th layer.Due to defeated Go out that electric current is bigger, so do on the one hand to avoid and additional loss is brought using via, be on the other hand also beneficial to reduce eventually Damaged on end consumes.
It is applied as shown in figure 4, matrix transformer is adjusted for the turn ratio that a kind of synchronous rectifier integrates in half-bridge logical link control (LLC) resonant The course of work of converter, is illustrated below with present example.
Input voltage VINFor 100~400VDC, output voltage Vo=12V, switching frequency 1MHz, resonant frequency 1MHz, half Bridge LLC resonant converter, which is operated in, determines frequency pattern.The number of turn N of single discrete transformer primary side windingP1~NP4It is 4 circles, secondary The number of turn N of windingSa1~NSa4, NSb1~NSb4It is 1 circle.
First, input voltage V is gatheredIN, and judge input voltage VINScope.
Work as 350V<VIN, S1~S4It is turned off, M1~M8Work normally.The effective turn of primary side winding is 16 circles, former secondary The turn ratio of side winding is 16:1:1.
Work as 250V<VIN<350V, S1~S3It is turned off, S4It is open-minded, M1~M6Normal work, M7~M8Grid are driven to low level, It does not work.The effective turn of primary side winding is 12 circles, and the turn ratio of former vice-side winding is 12:1:1.
Work as 150V<VIN<250V, S1、S2Shut-off, S3、S4It is open-minded, M1~M4Normal work, M5~M8Grid are driven to low level, It does not work.The effective turn of primary side winding is 8 circles, and the turn ratio of former vice-side winding is 8:1:1.
Work as 100V<VIN<150V, S1Shut-off, S2~S4It is open-minded, M1~M2Normal work, M3~M8Grid are driven to low level, It does not work.The effective turn of primary side winding is 4 circles, and the turn ratio of former vice-side winding is 4:1:1.
To sum up, the turn ratio that a kind of synchronous rectifier of the present invention integrates is adjusted matrix transformer and is suitable for MHz work LLC half bridge resonant under frequency.

Claims (7)

1. matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates, the synchronous rectification LLC applied to half-bridge structure is humorous Shake converter, it is characterised in that：Including four discrete transformers, each transformer set there are one primary side winding and one with The centre cap vice-side winding of the primary side winding symmetrical coupled is connected between the primary side winding of four discrete transformers, and each It is in parallel between the centre cap vice-side winding of primary side winding symmetrical coupled, in each primary side winding a primary side in parallel around Group control switching tube, and respective resonant inductance and magnetizing inductance in LLC resonant converter are integrated in each primary side winding, Be integrated with respective two synchronous rectifiers and two output capacitances on each vice-side winding, the operating mode of synchronous rectifier by Primary side winding controls the influence of switching tube, by controlling primary side winding that opening for switching tube is controlled to change primary side winding with shut-off Effective turn, and then adjust the turn ratio of former vice-side winding.
2. matrix transformer is adjusted in the turn ratio that synchronous rectifier according to claim 1 integrates, it is characterised in that：Four The number of turn of four primary side windings in discrete transformer is respectively NP1、NP2、NP3And NP4, NP1=NP2=NP3=NP4=NP, four Resonant inductance L is respectively provided in a primary side winding circuitrWith magnetizing inductance Lm, the resonant inductance L in each primary side winding circuitr's One end connects the drain electrode that switching tube is controlled in the primary side winding circuit, resonant inductance LrOther end connection magnetizing inductance LmOne The Same Name of Ends of primary side winding in end and the primary side winding circuit, the different name end connection magnetizing inductance L of primary side windingmThe other end and The source electrode of switching tube is controlled in the primary side winding circuit, the control switching tube in parallel with each primary side winding is respectively S1、S2、S3、 S4, control switching tube S1Source electrode connection control switching tube S2Drain electrode, control switching tube S2Source electrode connection control switching tube S3 Drain electrode, control switching tube S3Source electrode connection control switching tube S4Drain electrode, control switching tube S4Source electrode connection primary side GND_P, control switching tube S1Drain electrode pass through resonant capacitance CrConnect the output terminal HB of primary side power tube；Four centre cap pairs The number of turn of side winding is respectively NSa1And NSb1；NSa2And NSb2；NSa3And NSb3And NSa4And NSb4, NSa1=NSb1=NSa2=NSb2= NSa3=NSb3=NSa4=NSb4=NS, two synchronous rectifier M and two are respectively provided in each centre cap vice-side winding circuit Output capacitance CO, the Same Name of Ends connected in 1/2 vice-side winding of centre cap that drains of a synchronous rectifier M, the synchronous rectification The source electrode of pipe M connects an output capacitance COOne end, output capacitance COThe other end and another output capacitance COAfter series connection The source electrode of another synchronous rectifier M is connected, another 1/2 vice-side winding of the drain electrode connection centre cap of synchronous rectifier M In different name end, the Same Name of Ends of 1/2 vice-side winding connects the different name end in previous 1/2 vice-side winding and as centre cap Connect two output capacitance COSeries connection end, the centre caps of four centre cap vice-side windings is connected together as output electricity The output terminal of Vo is pressed, two output capacitance C in four centre cap vice-side winding circuitsONon- series connection end link together simultaneously With connecting secondary GND_S.
3. matrix transformer is adjusted in the turn ratio that synchronous rectifier according to claim 2 integrates, it is characterised in that：Each original In the winding loop of side control switching tube and with the synchronous rectifier pair in the centre cap vice-side winding circuit of its symmetrical coupled It should be as follows：Control switching tube S1Corresponding synchronous rectifier M1And M2；Control switching tube S2Corresponding synchronous rectifier M3And M4；Control is opened Close pipe S3Corresponding synchronous rectifier M5And M6；Control switching tube S4Corresponding synchronous rectifier M7And M8；When control switching tube is opened Priority is S4>S3>S2>S1, priority during shut-off is S1>S2>S3>S4；
The effective turn for opening with shut-off to change primary side winding by controlling primary side winding control pipe, and then adjusting is former The turn ratio of vice-side winding, specially：
S1~S4During shut-off, the effective turn of primary side winding is NP1+NP2+NP3+NP4, i.e. 4NP；
S1~S3Shut-off, S4When opening, the effective turn of primary side winding is NP1+NP2+NP3, i.e. 3NP；
S1、S2Shut-off, S3、S4When opening, the effective turn of primary side winding is NP1+NP2, i.e. 2NP；
S1Shut-off, S2~S4When opening, the effective turn of primary side winding is NP；
S1~S4When opening, the effective turn of primary side winding is 0, therefore forbids S1~S4It is open-minded,
It is above-mentioned it is various in the case of, the effective turn of vice-side winding is always NS；
The synchronous rectifier M1~M8Operating mode influenced by primary side winding control pipe, be specially：
S1~S4During shut-off, M1~M8Normal work；
S1~S3Shut-off, S4When opening, M1~M6Normal work, M7~M8Grid are driven to low level, do not work；
S1、S2Shut-off, S3、S4When opening, M1~M4Normal work, M5~M8Grid are driven to low level, do not work；
S1Shut-off, S2~S4When opening, M1、M2Normal work, M3~M8Grid are driven to low level, do not work.
4. matrix transformer is adjusted in the turn ratio that synchronous rectifier according to claim 2 integrates, it is characterised in that：Four The number of turn N of primary side windingP1=NP2=NP3=NP4=NP, take NP=4, the number of turn N of four centre cap vice-side windingsSa1=NSb1 =NSa2=NSb2=NSa3=NSb3=NSa4=NSb4=NS, take NS=1.
5. matrix transformer is adjusted in the turn ratio that synchronous rectifier according to claim 1 integrates, it is characterised in that：It is described The model encapsulation all same of control switching tube in each primary side winding circuit, the synchronization in each centre cap vice-side winding circuit are whole The model encapsulation all same of flow tube, output capacitance COModel encapsulation all same.
6. matrix transformer is adjusted in the turn ratio that synchronous rectifier according to claim 1 integrates, it is characterised in that：Magnetic core Quantity n>1, take n=4.
7. matrix transformer is adjusted in the turn ratio that synchronous rectifier according to any one of claims 1 to 7 integrates, special Sign is：The flat surface transformer that the matrix transformer is made of four layers of pcb board, thickness of slab 1.5mm, each layer copper foil copper are thick For 2oz, the thickness of insulating layer between each layer is 0.35mm, and winding is distributed as：First layer, the 4th layer of placement vice-side winding, the Two layers, third layer placement primary side winding, magnetic core select UI shapes, and core material selects 3F46.
CN201810129632.6A 2018-02-08 2018-02-08 Matrix transformer is adjusted in the turn ratio that a kind of synchronous rectifier integrates Pending CN108122664A (en)

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Cited By (13)

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Publication number Priority date Publication date Assignee Title
CN109039111A (en) * 2018-07-16 2018-12-18 深圳市安健科技股份有限公司 A kind of boost rectifying circuit
CN110880502B (en) * 2018-09-05 2022-10-14 无锡华润上华科技有限公司 Semiconductor structure and motor driving device
CN110880502A (en) * 2018-09-05 2020-03-13 无锡华润上华科技有限公司 Semiconductor structure and motor driving device
US11133750B2 (en) 2018-11-02 2021-09-28 Delta Electronics (Shanghai) Co., Ltd. Power module
CN109841398A (en) * 2019-02-19 2019-06-04 南京航空航天大学 A kind of DC converting system based on integrated planar matrix transformer
CN110880873A (en) * 2019-12-03 2020-03-13 浙江大学 LLC resonant converter resonant cavity switching device and control method
EP4097823A4 (en) * 2020-01-29 2024-02-07 Resonant Link Inc Resonant lc structure with standalone capacitors
WO2021227231A1 (en) * 2020-05-14 2021-11-18 深圳威迈斯新能源股份有限公司 Dcdc architecture suitable for different input power grids and control method therefor
CN111883351A (en) * 2020-07-23 2020-11-03 天津大学 Magnetic core structure based on multi-resonance converter
CN113328633A (en) * 2021-05-17 2021-08-31 国网宁夏电力有限公司电力科学研究院 Interleaved four-channel low-current ripple LLC resonant converter
CN113972057A (en) * 2021-12-13 2022-01-25 潜润电子科技(苏州)有限公司 Multi-layer board transformer for series resonance circuit
WO2024021539A1 (en) * 2022-07-26 2024-02-01 西安交通大学 Fractional-turn planar transformer, and converter
CN115459561A (en) * 2022-11-11 2022-12-09 国网江西省电力有限公司电力科学研究院 Converter device suitable for distributed photovoltaic

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