CN112532067B - Double-channel high-gain series-parallel LLC resonant converter - Google Patents

Double-channel high-gain series-parallel LLC resonant converter Download PDF

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CN112532067B
CN112532067B CN202011374407.2A CN202011374407A CN112532067B CN 112532067 B CN112532067 B CN 112532067B CN 202011374407 A CN202011374407 A CN 202011374407A CN 112532067 B CN112532067 B CN 112532067B
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resonant
series
diode
channel
converter
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CN112532067A (en
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薛飞
马鑫
徐恒山
张爽
田蓓
李宏强
张迪
王超
周雷
杨慧彪
顾雨嘉
张汉花
吴玫蓉
梁剑
任勇
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China Three Gorges University CTGU
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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China Three Gorges University CTGU
Electric Power Research Institute of State Grid Ningxia Electric Power 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
    • 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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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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Abstract

The invention provides a double-channel high-gain series-parallel LLC resonant converter, and belongs to the technical field of power electronics. The method comprises the following steps: full-control type switching device Q1Full control typeSwitching device Q2Resonant capacitor Cr1Resonant capacitor Cr2Resonant inductor Lr1Resonant inductor Lr2Isolation transformer T1Isolation transformer T2Rectifier diode D1Rectifier diode D2Rectifier diode D3Rectifier diode D4Capacitor filter CoAn output filter inductor LoAnd a load resistance R. The invention can improve the voltage gain of the converter and reduce the switching frequency range.

Description

Double-channel high-gain series-parallel LLC resonant converter
Technical Field
The invention relates to the technical field of power electronics, in particular to a dual-channel high-gain series-parallel LLC resonant converter.
Background
The series-parallel Logic Link Control (LLC) resonant converter has the characteristics of soft switching, high efficiency, high power density and wide voltage gain range, and can be used in multiple fields of space power supplies, server power supplies, vehicle-mounted chargers and the like. According to the division of the circuit structure, the series-parallel LLC resonant converter can be divided into a half-bridge series-parallel LLC resonant converter and a full-bridge series-parallel LLC resonant converter.
On the premise that the output voltage, the resonance parameters and the load state are the same, the voltage gain of the half-bridge type series-parallel LLC resonant converter is narrower and is about half of the voltage gain of the full-bridge type series-parallel LLC resonant converter, the full-bridge type series-parallel LLC resonant converter can provide wider voltage gain, however, the primary side of the full-bridge type series-parallel LLC resonant converter is provided with four high-frequency switching devices, four driving circuits are needed, the switching frequency range is wider, and the hardware complexity and the hardware cost of the full-bridge type series-parallel LLC resonant converter are higher than those of the half-bridge type series-parallel LLC resonant converter.
Disclosure of Invention
In view of this, the present invention provides a dual-channel high-gain series-parallel LLC resonant converter, which is used to increase the voltage gain of the converter and reduce the switching frequency range.
The technical scheme adopted by the embodiment of the invention for solving the technical problem is as follows:
a double-channel high-gain series-parallel LLC resonant converter is characterized by comprising a fully-controlled switch device Q1Fully-controlled switching device Q2Resonant capacitor Cr1Resonant capacitor Cr2Resonant inductor Lr1Resonant inductor Lr2Isolation transformer T1Isolation transformer T2Rectifier diode D1Rectifier diode D2Rectifier diode D3Rectifier diode D4Capacitor filter CoOutput filter inductor LoAnd a load resistance R,
said Q1And said Q2In series, said Q1Is connected to a voltage source UiThe positive electrode of (1), the Q2Is connected to the UiThe negative electrode of (1), the T1One end of the primary winding is connected with the C in seriesr1Is then connected to the UiThe positive electrode of (1), the positive electrode of (T)1The other end of the primary winding is connected in series with the Lr1Post-connected to said Q1And said Q2Node b in between, the T2One end of the primary winding is connected in series with the Lr2Is then connected to the node b, the T2The other end of the primary winding is connected in series with the Cr2Is then connected to the UiThe negative electrode of (a) is a positive electrode,
the T is1Comprising 2 secondary windings, T1One secondary winding of (2) is connected with the D1The anode of (a), the T1Is connected to said D2The anode of (1), the LoIs connected with the output voltage UoThe positive electrode of (1), the said LoAnother pin of the pin is connected with the pin D1And the cathode and the anode2The cathode of (a) is provided,
the T is2Comprising 2 secondary windings, T2One secondary winding of (2) is connected with the D3The anode of (a), the T2Is connected to said D4The anode of (D)3And the cathode and the anode4Are all connected to the T1The center-tapped winding of, the T2Is connected to said UoThe negative electrode of (1), the positive electrode of (C)oAre respectively connected to the UoOf said R and said CoParallel connection;
the LLC resonant converter further comprises the T1Excitation inductance Lm1The T2Excitation inductance Lm2Said L ism1Is connected to the T1Between 2 primary windings of said Lm2Is connected to the T2Between 2 primary windings of Lm1＝Lm2＝Lm(ii) a Said Lr1And the inductance value of Lr2The inductance value of L is the samer1And said Lr2End of same name being opposite, Lr1＝Lr2＝Lr(ii) a Said C isr1And the capacitance value of Cr2Have the same capacitance value, Cr1＝Cr2＝Cr(ii) a The T is1The number of turns of the primary and secondary sides and the T2The original secondary side has the same number of turns, and T is1Transformation ratio N ofT1And said T2Transformation ratio N ofT2Same, said NT1＝NT2＝NT＝n:1:1；
The voltage gain curve G (S) of the two-channel high-gain series-parallel LLC resonant converter is represented as follows:
Figure GDA0003487655570000031
wherein, G(s)Channel 1Voltage gain for the first resonant channel, the G(s)Channel 2For the voltage gain of the second resonant channel, s represents the s-domain operator, PoTo output power, LmFor exciting inductance, LrIs a resonant inductor, CrIs a resonant capacitor, UoIs the output voltage.
Preferably, said Q1And said Q2Are all MOSFET devices, said Q1And said Q2Both with a parallel capacitor and an anti-parallel diode.
Preferably, said Lr1And said Lr2Sharing a magnetic core.
The invention provides a double-channel high-gain series-parallel LLC resonant converter which is used for converting a direct-current input voltage which changes in a wide range into a stable direct-current output voltage to be supplied to a load or an energy storage battery.
Drawings
Fig. 1 is a circuit structure diagram of a dual-channel high-gain series-parallel LLC resonant converter.
Fig. 2 is an equivalent circuit diagram of an LLC resonant converter in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a working waveform of the LLC resonant converter in the under-resonant state according to the embodiment of the invention;
fig. 4 is a schematic diagram of an operating waveform of the LLC resonant converter at a resonant point in the embodiment of the present invention;
fig. 5 is a schematic diagram of an operating waveform of the LLC resonant converter in the over-resonance state according to the embodiment of the present invention;
fig. 6 is a state diagram of an operation mode 1 of the LLC resonant converter in the embodiment of the present invention;
fig. 7 is a state diagram of an operation mode 2 of the LLC resonant converter in the embodiment of the present invention;
fig. 8 is a state diagram of an operation mode 3 of the LLC resonant converter in the embodiment of the present invention;
fig. 9 is a state diagram of an operation mode 4 of the LLC resonant converter in the embodiment of the present invention;
fig. 10 is a state diagram of an operation mode 5 of the LLC resonant converter in the embodiment of the present invention;
fig. 11 is a voltage gain curve of an LLC resonant converter in accordance with an embodiment of the present invention.
In the figure: full-control type switching device Q1Fully-controlled switching device Q2Resonant capacitor Cr1Resonant capacitor Cr2Resonant inductor Lr1Resonant inductor Lr2Isolation transformer T1Isolation transformer T2Rectifier diode D1And a rectifier diode D2Rectifier diode D3Rectifier diode D4Capacitor filter CoAn output filter inductor LoLoad resistor R, node a, node b, node c, node d, node e, node f, node g and voltage source UiOutput voltage UoAnd an excitation inductor Lm1And an excitation inductor Lm2Control signal p1Control signalNumber p2Current iQ1Current iQ2Current im1Current im2Current ir1Current ir2Current iTs1Current iTs2Current iL0Current iC0Current iR0Current i0Current iiA first resonant channel S1A second resonant channel S2。
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements and electrical quantities, or elements having the same or similar functions, throughout. The following example is only one example of the application of the present invention and is not to be construed as limiting the present invention.
The invention provides a double-channel high-gain series-parallel LLC resonant converter aiming at the defects that a half-bridge series-parallel LLC resonant converter is small in voltage gain and a full-bridge series-parallel LLC resonant converter is complex in hardware structure.
In the embodiment of the invention, 2 high-frequency fully-controlled switching devices and 2 paths of driving circuits are adopted to construct 2 half-bridge type series-parallel LLC resonant converters which can have the characteristics of wide voltage gain and narrow working frequency.
Specifically, the circuit of the dual-channel high-gain series-parallel LLC resonant converter provided by the embodiment of the invention is divided into three parts, namely a switch part, a resonant channel part and a load part. The switch part comprises 2 primary side high-frequency switch devices Q1And Q2And its driving circuit, secondary side rectifier diode D1-D4(ii) a The resonant channel part comprises a first resonant channel S and a second resonant channel S1By resonant electricityFeeling Lr1Resonant capacitor Cr1And a transformer T1Composition of a second resonant channel S2By a resonant inductance Lr2Resonant capacitor Cr2And a transformer T2Composition is carried out; the load part comprises an output filter inductor LoAn output filter capacitor CoAnd a load resistance R.
As shown in fig. 1, the circuit of the dual-channel high-gain series-parallel LLC resonant converter according to the embodiment of the present invention is formed by the following power electronic components: full-control type switching device Q1Fully-controlled switching device Q2Resonant capacitor Cr1Resonant capacitor Cr2Resonant inductor Lr1Resonant inductor Lr2Isolation transformer T1Isolation transformer T2Rectifier diode D1Rectifier diode D2Rectifier diode D3Rectifier diode D4Capacitor filter CoOutput filter inductor LoAnd a load resistance R.
Wherein, the switch Q1And switch Q2Series, switch Q1Is connected to a voltage source UiPositive electrode of (2), switch Q2Is connected to UiNegative electrode of (1), T1One end of the primary winding is connected in series with Cr1Is connected to UiPositive electrode of (2), T1The other end of the primary winding is connected in series with Lr1Back-connected to switch Q1And switch Q2Node b, T between2One end of the primary winding is connected in series with Lr2Back-connected to node b, T2The other end of the primary winding is connected in series with Cr2Is connected to UiNegative electrode of (1), T1Comprising 2 secondary windings, T1One secondary winding of the transformer is connected with a diode D1Anode of (2), T1Another secondary winding of the transformer is connected with a diode D2Anode of (2), output filter inductor LoIs connected with the output voltage UoPositive electrode of (2), LoAnother pin of the diode D1And diode D2Cathode of (2), T2Comprising 2 secondary windings, T2One secondary winding of the transformer is connected with a diode D3Anode of (2), T2Another secondary winding of the transformer is connected with a diode D4Anode of (2), diode D3Cathode and diode D4Are all connected to T1Of a center-tapped winding, T2Is connected to UoNegative electrode of (1), CoAre respectively connected to UoOf two poles, R and CoIn parallel, also connected to UoTwo poles of (1).
The LLC resonant converter also comprises T1Excitation inductance Lm1、T2Excitation inductance Lm2，Lm1Is connected at T1Between 2 primary windings of Lm2Is connected at T2Between 2 primary windings of Lm1＝Lm2＝Lm。
Resonant inductor Lr1Inductance value and resonant inductance Lr2Has the same inductance value, i.e. Lr1＝Lr2＝Lr. Resonant inductor Lr1And a resonant inductor Lr2Has equal turns and opposite ends, and flows through the resonant inductor Lr1And a resonant inductor Lr2Are equal in magnitude and opposite in sign.
Resonant capacitor Cr1Capacitance value of (2) and resonance capacitance Cr2Has the same capacitance value and the same maximum working voltage value, and flows through Cr1Current flow through Cr2The current values of (a) are equal in magnitude and opposite in sign.
Switch Q1And switch Q2Are all MOSFET devices, switch Q1And switch Q2Both with a parallel capacitor and an anti-parallel diode.
T1The number of turns of the primary and secondary sides and T2Has the same number of turns of the original secondary side and T1Transformation ratio N ofT1And T2Transformation ratio N ofT2Also, N is the sameT1＝n:1:1，NT2＝n:1:1。
Transformer T1And a transformer T2All of which are of a construction with a centre tap on the secondary side, i.e. transformers T1And a transformer T2The primary side of the transformer has only 1 winding, but the secondary sides of the two transformers have 2 windings, and the number of turns of the secondary side is 2The same is true.
Resonant inductor Lr1And a resonant inductor Lr2The two resonant inductors can be designed to be wound on the same coupling magnetic core, but the winding directions are opposite, so that the ends with the same name are opposite, and the number of turns of the two resonant inductors is equal.
The number of magnetic elements in the circuit shown in fig. 1 may be 3, two resonant inductors Lr1、Lr2Wound on the same core, a transformer T1And transformer T 21 magnetic core is used respectively; the number of magnetic elements may be 4, in which case two resonant inductors Lr1、Lr2Each with 1 core.
When diode D1Conducting and diode D2When the reverse blocking is performed, the primary voltage of the transformer is UoNT1When diode D2Conducting and diode D1When the reverse blocking is performed, the primary voltage of the transformer is-UoNT1(ii) a When diode D3Conducting and diode D4When the reverse blocking is performed, the primary voltage of the transformer is UoNT2When diode D3Conducting and diode D4When the reverse blocking is performed, the primary voltage of the transformer is-UoNT2Wherein N isT1For a transformer T1Transformation ratio of (1), NT2For a transformer T2The transformation ratio of (a).
Control signal p1And a control signal p2Are respectively Q1And Q2Control signal of tdIs a control signal p1And p2Dead time of tdFor implementing fully-controlled switching devices Q1And Q2Zero voltage turn-on, i.e. realizing fully-controlled switching device Q1And Q2The soft switching of (1).
Two resonance channels S of the embodiment of the invention1、S2Has complementary characteristics: the currents of the two resonant inductors are equal in magnitude and opposite in sign, the voltages of the two resonant capacitors are equal in magnitude and opposite in sign, and the exciting currents of the two transformers are equal in magnitude and opposite in sign.
The invention embodiment of a double-channel high-gain series-parallel LLC resonant converterIn the circuit structure, the primary side only has 2 high-frequency devices, the number of the high-frequency devices is the same as that of circuits of a half-bridge LLC resonant converter, but the voltage gain of the high-frequency devices is wider and is 2 times of that of the circuits of the half-bridge LLC resonant converter; the current flowing in the resonant channel is smaller than the currents of the half-bridge resonant converter and the full-bridge resonant converter; diodes D of each secondary side1、D2、D3、D4Is only the output voltage UoIs half of that, namely, Uo/2。
According to the double-channel high-gain series-parallel LLC resonant converter disclosed by the embodiment of the invention, in the over-resonant region, the voltage gain has faster response to the switching frequency, and the numerical value of the maximum switching frequency is smaller than that of the full-bridge resonant converter.
In the double-channel high-gain series-parallel LLC resonant converter of the embodiment of the invention, in an under-resonance region, the voltage gain is the same as that of a full-bridge resonant converter, but the primary side of the converter only has 2 high-frequency devices and 2 drive circuits, and the full-bridge resonant converter needs 4 high-frequency switching devices and 4 drive circuits.
According to the relation between the switching frequency and the resonant frequency of the converter, the LLC resonant converter provided by the embodiment of the invention has three working areas, namely an under-resonant area, an over-resonant area and a resonant point.
Fig. 3 is a schematic diagram of a working waveform of the LLC resonant converter in an under-resonant state in the embodiment of the present invention, when the switching frequency is less than the resonant frequency, the LLC resonance works in the under-resonant region:
when t is more than or equal to 0<tdWhen i isQ2To Q2Is discharged at tdBefore time, Q2Is 0 at tdTime, Q2Switching on in a zero voltage mode;
when t isd≤t<t1When is, Q1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the LLC resonant converter is shown in FIG. 6;
when t is1≤t<t2When is, Q1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the LLC resonant converter is shown in FIG. 7;
when t is2≤t<t3When is, Q1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the LLC resonant converter is shown in FIG. 8;
when t is3≤t<0.5TsWhen is, Q1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the blocking LLC resonant converter is shown in figure 9.
Fig. 4 is a schematic diagram of an operating waveform of the LLC resonant converter at a resonant point according to the embodiment of the present invention, and when the switching frequency is equal to the resonant frequency, the LLC resonant converter operates at the resonant point:
when t is more than or equal to 0<tdWhen i isQ2To Q2Is discharged at tdBefore time, Q2The voltage of the parallel capacitor of (1) is 0 at tdTime, Q2Switching on in a zero voltage mode;
when t isd≤t<t1When is, Q1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the converter is shown in FIG. 6;
when t is1≤t<t2When Q is1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the converter is shown in FIG. 7 after the blocking;
when t is2≤t<0.5TsWhen is, Q1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the converter is shown in FIG. 8 after the blocking;
fig. 5 is a schematic diagram of an operating waveform of the LLC resonant converter in an over-resonant state according to the embodiment of the present invention, when the switching frequency is greater than the resonant frequency, the converter operates in an over-resonant region:
when t is more than or equal to 0<t1When is, Q1Off, Q2Conducting, diode D2And a diode D3Conducting, diode D1And a diode D4The working state diagram of the converter is shown in FIG. 10 after the blocking;
when t is1≤t<t2When Q is1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the converter is shown in FIG. 6;
when t is2≤t<t3When is, Q1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the converter is shown in FIG. 7 after the blocking;
when t is3≤t<0.5TsWhen is, Q1Off, Q2Conducting, diode D1And a diode D4Conducting, diode D2And a diode D3The working state diagram of the converter is shown in fig. 8.
Fig. 2 is an equivalent circuit diagram of the LLC resonant converter shown in fig. 1, which includes two half-bridge series-parallel LLC resonant converters, and the primary sides of the two half-bridge series-parallel LLC resonant converters are connected in parallel and the secondary sides are connected in series. According to fig. 2, the voltage gain curve g(s) of the LLC resonant converter of the present invention can be expressed as:
Figure GDA0003487655570000091
the above G(s)Channel 1And G(s)Channel 2Are respectively a first resonant channelAnd the voltage gain of the second resonant channel, s representing the s-domain operator, PoTo output power, LmFor exciting inductance, LrIs a resonant inductance, CrIs a resonant capacitor, UoIs the output voltage.
As shown in fig. 11, a voltage gain curve of the LLC resonant converter can be obtained according to the formula (1), where a resonant frequency f, a curve a is a voltage gain curve of the LLC resonant converter, a curve b is a voltage gain curve of the full-bridge resonant converter, and a curve c is a voltage gain curve of the half-bridge resonant converter, and it is shown from the result of fig. 11 that the voltage gain of the LLC resonant converter in the embodiment of the present invention is higher than that of the half-bridge resonant converter and the full-bridge resonant converter.
According to the double-channel high-gain series-parallel LLC resonant converter, the resonant converter is constructed by using the two high-frequency fully-controllable switching devices and the two driving circuits, so that the voltage gain of the resonant converter is improved, and the switching frequency range lower than that of a full-bridge resonant circuit can be obtained.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims (3)

1. A double-channel high-gain series-parallel LLC resonant converter is characterized by comprising a fully-controlled switch device Q1Fully-controlled switching device Q2Resonant capacitor Cr1Resonant capacitor Cr2Resonant inductor Lr1Resonant inductor Lr2Isolation transformer T1Isolation transformer T2Rectifier diode D1Rectifier diode D2Rectifier diode D3Rectifier diode D4Capacitor filter CoAn output filter inductor LoAnd a load resistor R, the resonant inductor Lr1The resonant capacitor Cr1And the transformer T1Make up of the firstResonant channel S1Said resonant inductor Lr2The resonant capacitor Cr2And the transformer T2Form a second resonant channel S2；
Said Q1And said Q2In series, said Q1Is connected to a voltage source UiThe positive electrode of (1), the Q2Is connected to the UiThe negative electrode of (1), the T1One end of the primary winding is connected with the C in seriesr1Is then connected to the UiThe positive electrode of (1), the positive electrode of (T)1The other end of the primary winding is connected in series with the Lr1Post-connected to said Q1And said Q2Node b in between, the T2One end of the primary winding is connected in series with the Lr2Is then connected to the node b, the T2The other end of the primary winding is connected in series with the Cr2Is then connected to the UiThe anode of (a) is provided,
the T is1Comprising 2 secondary windings, T1One secondary winding of (2) is connected with the D1The anode of (a), the T1Is connected to said D2The anode of (1), the LoIs connected with the output voltage UoThe positive electrode of (1), the said LoAnother pin of the pin is connected with the pin D1And the cathode and the anode2The cathode of (a) is provided,
the T is2Comprising 2 secondary windings, T2One secondary winding of (2) is connected with the D3The anode of (a), the T2Is connected to said D4The anode of (D)3And the cathode and the anode4Are all connected to the T1Of said center-tapped winding, said T2Is connected to said UoThe negative electrode of (1), the positive electrode of (C)oAre respectively connected to the UoOf said R and said CoParallel connection;
the LLC resonant converter further comprises the T1Excitation inductance Lm1The T2Excitation inductance Lm2Said L ism1Is connected to the T1Of 2 primary windingsIs described asm2Is connected to the T2Between 2 primary windings of Lm1＝Lm2＝Lm(ii) a Said Lr1And the inductance value of Lr2Is the same as Lr1And said Lr2End of same name being opposite, Lr1＝Lr2＝Lr(ii) a Said C isr1And the capacitance value of Cr2Have the same capacitance value, Cr1＝Cr2＝Cr(ii) a The T is1The number of turns of the primary and secondary sides and the T2The original secondary side has the same number of turns, and T is1Transformation ratio N ofT1And said T2Transformation ratio N ofT2Same, said NT1＝NT2＝NT＝n:1:1；
The voltage gain curve G (S) of the dual-channel high-gain series-parallel LLC resonant converter is represented as:
Figure FDA0003487655560000021
wherein, G(s)Channel 1Voltage gain for the first resonant channel, the G(s)Channel 2For the voltage gain of the second resonant channel, s represents the s-domain operator, PoTo output power, LmFor exciting inductance, LrIs a resonant inductor, CrIs a resonant capacitor, UoIs the output voltage.
2. The LLC resonant converter of claim 1, wherein said Q1And said Q2Are all MOSFET devices, said Q1And said Q2Both with a parallel capacitor and an anti-parallel diode.
3. The LLC resonant converter of claim 1, wherein said Lr1And said Lr2Sharing a magnetic core.
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US20110069513A1 (en) * 2009-09-18 2011-03-24 Chung-Shu Lee Current-Sharing Power Supply Apparatus With Bridge Rectifier Circuit
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