CN102497108A - LLC resonance type push-pull forward conversion topology - Google Patents

LLC resonance type push-pull forward conversion topology Download PDF

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Publication number
CN102497108A
CN102497108A CN2011104410088A CN201110441008A CN102497108A CN 102497108 A CN102497108 A CN 102497108A CN 2011104410088 A CN2011104410088 A CN 2011104410088A CN 201110441008 A CN201110441008 A CN 201110441008A CN 102497108 A CN102497108 A CN 102497108A
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China
Prior art keywords
connects
anode
capacitance
topology
pull
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Pending
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CN2011104410088A
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Chinese (zh)
Inventor
邓翔
赵国庆
陈杰
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Priority to CN2011104410088A priority Critical patent/CN102497108A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Abstract

The invention provides an LLC resonance type push-pull forward conversion topology. The topology is mainly characterized in that: on the basis of a current push-pull forward conversion topology, an L resonance circuit and a C resonance circuit are added at a secondary rectifier side. The topology uses the L resonance circuit and the C resonance circuit at a transformer secondary to eliminate a turn-off peak on a secondary rectifier diode; therefore, an RC absorption circuit or a CDD absorption circuit in an original push-pull forward conversion topology circuit can be removed, wherein the RC absorption circuit or the CDD absorption circuit is arranged for a diode backward recovery peak; and a filter inductor that is arranged at the back of the rectifier diode can also be removed. Meanwhile, soft switching of a main power tube can be realized; an EMC effect based on a topological converter can be improved; and losses of a main power switch tube and the rectifier diode can be reduced. Besides, the topology can be applied to a preceding stage of an inverter. According to the invention, the LLC resonance type push-pull forward conversion topology has advantages of simple structure, convenience, and reliable working and the like; and advantages like soft switching of various power devices and the like can be realized; therefore, the topology has a certain practical value.

Description

LLC mode of resonance push-pull ortho-exciting transformation topology
Technical field
The present invention relates to a kind of LLC mode of resonance push-pull ortho-exciting transformation topology.Belong to the topology invention of DC/DC conversion, the major technique field is fields such as Switching Power Supply, low-voltage, high-current input.
Background technology
In the Modern Production life, along with the development of power electronic technology, the DC/DC converter is widely used in various power electronic system power supply units, to satisfy with electric loading each generic request to power supply quality.Now, high power density, high efficiency, low cost, small size are found in the development of switching power converters, low EMI.
In the prior art, the Switching Power Supply topology has a lot.Like normal shock, anti-swash, half-bridge, full-bridge, recommend etc.Accompanying drawing 1 is existing push-pull ortho-exciting circuit.The end of the same name of transformer secondary Ns is directly connected to the anode of D1, negative electrode one end of D3; The other end is connected to anode one end of D2, negative electrode one end of D4.Anode one end of D1, anode one end of D2 connect and connect with the end of filter inductance L1, and the filter inductance other end is connected to the anode of output filter capacitor C3 as just exporting.Anode one end of D3, anode one end of D4 are connected to negative terminal the bearing as output of output filtering C3.Such topological structure can not be realized the soft switch of master power switch pipe S1, S2.Ds1, Ds2 are respectively the body parasitic diode of power switch tube S 1, S2 among Fig. 1.Because the reverse recovery of diode and being operated under the high frequency state has bigger due to voltage spikes on the rectifier diode.Need in the practical application to add the absorption circuit that turn-offs spike to diode, like RC or CDD etc.
The present invention adds resonant inductance Lr, resonant capacitance Cr at secondary.Through design suitable Lr, Cr can realize the soft switch of diode and main power tube, and does not need filter inductance L1.Can effectively suppress the due to voltage spikes on the diode, reduce loss and EMI noise, can obtain than higher efficient.
Summary of the invention
The object of the present invention is to provide a kind of LLC mode of resonance push-pull ortho-exciting transformation topology, have the advantages such as soft switch that can suppress and eliminate traditional filter inductance of recommending the peak voltage on the secondary rectifier diode in the forward converter, removing secondary side rectification circuit, realize the master power switch pipe.
The present invention realizes through following technical scheme: propose a kind of LLC mode of resonance push-pull ortho-exciting transformation topology; By transformer secondary series resonance inductance in the push-pull ortho-exciting circuit, resonant capacitance suppresses and eliminate secondary rectifier diode peak voltage; Realize the soft switch of power switch pipe, high efficiency realizes the electric energy conversion of DC-to-DC.
LLC mode of resonance push-pull ortho-exciting transformation topology of the present invention adopts circuit to realize, comprises voltage source vin, master power switch pipe S1 and S2; Input filter capacitor Cin; The transformer that comprises Np1, Np2, a Ns3 winding, resonant inductance Lr, resonant capacitance Cr; Rectifier diode D1, D2, D3, D4, output filter capacitor C3, load resistance RL.The annexation of circuit is: voltage source vin is parallelly connected with input filter capacitor Cin, and the anode of voltage source is connected with the anode of Cin, and the voltage source negative terminal is connected with the negative terminal of Cin.The end of the same name of Np1 connects the end of clamping capacitance C and the drain electrode of power tube S1; The different name end of Np1 connects the drain electrode of input capacitance Cin anode, power tube S2.The source electrode of power tube S2 connects the end of the same name of Np2, the other end of clamping capacitance C.The different name end of Np2 connects the source electrode of S1, the negative terminal of input capacitance Cin.The end of the same name of secondary Ns connects the end of resonant inductance Lr, and the other end of Lr connects the end of resonant capacitance Cr, and resonant inductance Lr connects with resonant capacitance Cr.The other end of resonant capacitance Cr connects anode one end of D1, negative electrode one end of D3; The different name end of Ns connects anode one end of D2, negative electrode one end of D4.Negative electrode one end of D1, negative electrode one end of D2 connect the anode of output filter capacitor C; The negative terminal of output capacitance C connects negative electrode one end of D3, anode one end of D4.D1, D2, D3, D4 constitute the rectifier bridge structure.Output filter capacitor C is parallelly connected with load resistance RL.The anode of output filter capacitor C is as the anode of output voltage, and the negative terminal of output filter capacitor C is as the negative terminal of output voltage.
Description of drawings
Accompanying drawing 1 is the push-pull ortho-exciting topology diagram
Accompanying drawing 2 is topology diagrams of the present invention
Accompanying drawing 3 is the present invention's topology mode sequential charts.Vgs1 is the drive signal waveform of power tube S1 among the figure; Vgs2 is the drive signal waveform of power tube S2; Vds1 is the drain-source voltage waveform of power tube S1, and Vds2 is the drain-source voltage waveform of power tube S2, and iLr is a resonant inductance Lr electric current; VD1 is rectifying tube D1 both sides voltage waveforms, and iD1 is the current waveform that flows through D1; VD2 is rectifying tube D2 both sides voltage waveforms, and iD2 is the current waveform that flows through D2.
Embodiment
The present invention is based on the basis of push-pull ortho-exciting circuit, between transformer secondary and rectifier bridge, add resonant network L, C.Be in particular in: voltage source vin is parallelly connected with input filter capacitor Cin, and the anode of voltage source is connected with the anode of Cin, and the voltage source negative terminal is connected with the negative terminal of Cin.The end of the same name of Np1 connects the end of clamping capacitance C and the drain electrode of power tube S1; The different name end of Np1 connects the drain electrode of input capacitance Cin anode, power tube S2.The source electrode of power tube S2 connects the end of the same name of Np2, the other end of clamping capacitance C.The different name end of Np2 connects the source electrode of S1, the negative terminal of input capacitance Cin.The end of the same name of secondary Ns connects the end of resonant inductance Lr, and the other end of Lr connects the end of resonant capacitance Cr, and resonant inductance Lr connects with resonant capacitance Cr.The other end of resonant capacitance Cr connects anode one end of D1, negative electrode one end of D3; The different name end of Ns connects anode one end of D2, negative electrode one end of D4.Negative electrode one end of D1, negative electrode one end of D2 connect the anode of output filter capacitor C; The negative terminal of output capacitance C connects negative electrode one end of D3, anode one end of D4.D1, D2, D3, D4 constitute the rectifier bridge structure.Output filter capacitor C is parallelly connected with load resistance RL.The anode of output filter capacitor C is as the anode of output voltage, and the negative terminal of output filter capacitor C is as the negative terminal of output voltage.Carry out principle analysis with operation mode below:
Shown in accompanying drawing 3
(1) t1 is before the moment, and power tube S1 drain-source voltage has been zero.
The t1 moment, the S1 conducting, then S1 is the no-voltage conducting, flows through linear the increasing of electric current of Np1; Secondary resonant network resonance, former limit is to the secondary transmission of power.In this mode, the drain-source voltage of S1 is 0; The drain-source voltage of S2 is clamped at 2Vin.Secondary D2, D3 conducting, D1, D4 are in off state.
(2) t2 S1 shutoff constantly, this moment, S2 also turn-offed, and S1 voltage rises rapidly by zero and is clamped to 2Vin, the body diode conducting of S2, drain-source voltage is zero.Up to t3 constantly, secondary resonant inductance current resonance is to zero, and rectifier diode D2, D3 zero-current switching do not have the reverse spike that recovers.
(3) during t3-t4, this mode is similar to mode 1, the conducting of S2 no-voltage, and to the secondary transmission of power, the drain-source voltage of S1 is clamped at 2Vin.Secondary D1, D4 conducting, D2, D3 are in off state.
(4) mode 4 (t4-t5): the similar mode 2 of this mode.

Claims (4)

1. a LLC mode of resonance push-pull ortho-exciting transformation topology is characterized in that: on the basis of existing push-pull ortho-exciting, add resonant inductance L r, resonant capacitance C r, remove other parts of rectifier diode back filter inductance, push-pull ortho-exciting: transformer (1), main power tube (2), rectifying tube (3), clamping capacitance (4), input filter capacitor (5), output filter capacitor (6), power supply and load be common forms complete LLC mode of resonance push-pull ortho-exciting transformation topology.Main power tube (2) is MOFET or IGBT, is labeled as S1, S2, and wherein Ds1, Ds2 are respectively its endophyte diode; Transformer (1) comprises elementary winding Np1, Np2 and secondary winding Ns.The present invention is through selecting suitable resonant inductance L r, resonant capacitance C rRealize the soft switch of main power tube, rectifying tube.
2. LLC mode of resonance push-pull ortho-exciting transformation topology as claimed in claim 1 is characterized in that:
Voltage source vin is parallelly connected with input filter capacitor Cin, and the anode of voltage source is connected with the anode of Cin, and the voltage source negative terminal is connected with the negative terminal of Cin.The end of the same name of Np1 connects the end of clamping capacitance C and the drain electrode of power tube S1; The different name end of Np1 connects the drain electrode of input capacitance Cin anode, power tube S2.The source electrode of power tube S2 connects the end of the same name of Np2, the other end of clamping capacitance C.The different name end of Np2 connects the source electrode of S1, the negative terminal of input capacitance Cin.The end of the same name of secondary Ns connects the end of resonant inductance Lr, and the other end of Lr connects the end of resonant capacitance Cr, and resonant inductance Lr connects with resonant capacitance Cr.The other end of resonant capacitance Cr connects anode one end of D1, negative electrode one end of D3; The different name end of Ns connects anode one end of D2, negative electrode one end of D4.Negative electrode one end of D1, negative electrode one end of D2 connect the anode of output filter capacitor C; The negative terminal of output capacitance C connects negative electrode one end of D3, anode one end of D4.D1, D2, D3, D4 constitute the rectifier bridge structure.Output filter capacitor C is parallelly connected with load resistance RL.The anode of output filter capacitor C is as the anode of output voltage, and the negative terminal of output filter capacitor C is as the negative terminal of output voltage.
3. LLC mode of resonance push-pull ortho-exciting transformation topology as claimed in claim 1 is characterized in that: adopt the control of PFM control mode.
4. LLC mode of resonance push-pull ortho-exciting transformation topology as claimed in claim 1, it is characterized in that: resonant inductance Lr can use the leakage inductance of transformer, also available independently inductance.
CN2011104410088A 2011-12-26 2011-12-26 LLC resonance type push-pull forward conversion topology Pending CN102497108A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102299633A (en) * 2010-06-24 2011-12-28 英飞特电子(杭州)有限公司 Direct current-direct current (DC) conversion circuit
CN102739064A (en) * 2012-06-29 2012-10-17 西北工业大学 Soft-switch full wave rectifying push-pull normal shock inverter
CN103066880A (en) * 2012-12-07 2013-04-24 武汉华中数控股份有限公司 Push-pull inverter circuit
CN103312171A (en) * 2013-06-15 2013-09-18 浙江大学 Isolated soft switching two-diode forward resonant DC / DC (direct-current/direct-current) circuit
CN103887976A (en) * 2014-03-25 2014-06-25 浙江大学 Current source input type resonance soft switching DC/DC converter
CN105939114A (en) * 2015-03-02 2016-09-14 松下知识产权经营株式会社 Electric power conversion device
CN106329943A (en) * 2016-09-07 2017-01-11 国网江苏省电力公司电力科学研究院 Low-voltage DC boost conversion and control circuit
CN106571749A (en) * 2015-10-10 2017-04-19 沈阳兴华航空电器有限责任公司 Inverter power supply
CN107846146A (en) * 2017-09-26 2018-03-27 六安金龙矿山机械科技有限公司 A kind of power circuit
CN112671248A (en) * 2021-03-16 2021-04-16 杭州富特科技股份有限公司 Converter device and control method thereof

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102299633A (en) * 2010-06-24 2011-12-28 英飞特电子(杭州)有限公司 Direct current-direct current (DC) conversion circuit
CN102739064A (en) * 2012-06-29 2012-10-17 西北工业大学 Soft-switch full wave rectifying push-pull normal shock inverter
CN102739064B (en) * 2012-06-29 2014-06-18 西北工业大学 Soft-switch full wave rectifying push-pull normal shock inverter
CN103066880B (en) * 2012-12-07 2014-12-17 武汉华中数控股份有限公司 Push-pull inverter circuit
CN103066880A (en) * 2012-12-07 2013-04-24 武汉华中数控股份有限公司 Push-pull inverter circuit
CN103312171A (en) * 2013-06-15 2013-09-18 浙江大学 Isolated soft switching two-diode forward resonant DC / DC (direct-current/direct-current) circuit
CN103312171B (en) * 2013-06-15 2016-04-20 浙江大学 Isolated soft switching double tube positive exciting resonance DC/DC circuit
CN103887976A (en) * 2014-03-25 2014-06-25 浙江大学 Current source input type resonance soft switching DC/DC converter
CN103887976B (en) * 2014-03-25 2017-06-16 浙江大学 The imported resonant type soft-switch DC/DC converters of current source
CN105939114A (en) * 2015-03-02 2016-09-14 松下知识产权经营株式会社 Electric power conversion device
CN106571749A (en) * 2015-10-10 2017-04-19 沈阳兴华航空电器有限责任公司 Inverter power supply
CN106329943A (en) * 2016-09-07 2017-01-11 国网江苏省电力公司电力科学研究院 Low-voltage DC boost conversion and control circuit
CN107846146A (en) * 2017-09-26 2018-03-27 六安金龙矿山机械科技有限公司 A kind of power circuit
CN112671248A (en) * 2021-03-16 2021-04-16 杭州富特科技股份有限公司 Converter device and control method thereof

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