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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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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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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Abstract

本发明提出了一种LLC谐振型推挽正激变换拓扑，主要特征是在现有推挽正激电路拓扑的基础上，副边整流侧添加L、C谐振电路。该拓扑通过变压器副边的L、C谐振电路，可消除副边整流二极管上的关断尖峰，以此可以去掉原推挽正激拓扑电路中针对二极管反向恢复尖峰的RC或CDD吸收回路，且可以去掉整流二极管后面的滤波电感；同时可实现主功率管的软开关，改善了基于该拓扑变换器的EMC效果，可降低主功率开关管和整流二极管的损耗。本发明亦可用于逆变器的前级。本发明电路拓扑具有结构简单、方便、工作可靠，实现各功率器件的软开关等优点，具有一定的实用价值。

Figure 201110441008

The invention proposes an LLC resonant push-pull forward conversion topology, the main feature of which is that on the basis of the existing push-pull forward circuit topology, L and C resonant circuits are added to the rectification side of the secondary side. This topology can eliminate the turn-off peak on the rectifier diode on the secondary side through the L and C resonant circuits on the secondary side of the transformer, so that the RC or CDD absorption loop for the reverse recovery peak of the diode in the original push-pull forward topology circuit can be removed. And the filter inductance behind the rectifier diode can be removed; at the same time, the soft switching of the main power tube can be realized, the EMC effect based on the topology converter can be improved, and the loss of the main power switch tube and the rectifier diode can be reduced. The present invention can also be used in the front stage of the inverter. The circuit topology of the invention has the advantages of simple structure, convenience, reliable operation, soft switching of various power devices, etc., and has certain practical value.

Figure 201110441008

Description

LLC谐振型推挽正激变换拓扑LLC resonant push-pull forward conversion topology

技术领域 technical field

本发明涉及一种LLC谐振型推挽正激变换拓扑。属于DC/DC变换的拓扑发明，主要技术领域为开关电源、低压大电流输入等领域。  The invention relates to an LLC resonant push-pull forward conversion topology. It belongs to the topology invention of DC/DC conversion, and its main technical fields are switching power supply, low voltage and high current input and other fields. the

背景技术 Background technique

在现代生产生活中，随着电力电子技术的发展，DC/DC变换器被广泛地应用于各种电力电子系统供电设备，以满足用电负载对供电质量的各类要求。现今，开关电源变换器的发展发现高功率密度、高效率、低成本、小体积，低EMI。  In modern production and life, with the development of power electronics technology, DC/DC converters are widely used in various power electronics system power supply equipment to meet various requirements of power loads for power supply quality. Today, the development of switching power converters has found high power density, high efficiency, low cost, small size, and low EMI. the

现有技术中，开关电源拓扑有很多。如正激、反激、半桥、全桥、推挽等。附图1为现有的推挽正激电路。变压器副边Ns的同名端直接连接到D1的阳极、D3的阴极一端；另一端连接到D2的阳极一端、D4的阴极一端。D1的阳极一端、D2的阳极一端连接并与滤波电感L1的一端串联，滤波电感另一端连接到输出滤波电容C3的正端作为输出的正。D3的阳极一端、D4的阳极一端连接到输出滤波C3的负端作为输出的负。这样的拓扑结构不能实现主功率开关管S1、S2的软开关。图1中Ds1、Ds2分别为功率开关管S1、S2的体寄生二极管。由于二极管的反向恢复及其工作在高频状态下，整流二极管上会有比较大的电压尖峰。实际应用中需要添加针对二极管关断尖峰的吸收电路，如RC或CDD等。  In the prior art, there are many switching power supply topologies. Such as forward, flyback, half-bridge, full-bridge, push-pull, etc. Accompanying drawing 1 is the existing push-pull forward circuit. The terminal with the same name on the secondary side of the transformer Ns is directly connected to the anode of D1 and the cathode of D3; the other end is connected to the anode of D2 and the cathode of D4. The anode end of D1 and the anode end of D2 are connected in series with one end of the filter inductor L1, and the other end of the filter inductor is connected to the positive end of the output filter capacitor C3 as the positive output. The anode end of D3 and the anode end of D4 are connected to the negative end of the output filter C3 as the output negative. Such a topological structure cannot realize soft switching of the main power switch tubes S1 and S2. Ds1 and Ds2 in Fig. 1 are body parasitic diodes of power switch tubes S1 and S2 respectively. Due to the reverse recovery of the diode and its operation at high frequency, there will be relatively large voltage spikes on the rectifier diode. In practical applications, it is necessary to add a snubber circuit for the diode turn-off peak, such as RC or CDD. the

本发明在副边添加谐振电感Lr、谐振电容Cr。通过设计合适的Lr、Cr即可实现二极管和主功率管的软开关，并且不需要滤波电感L1。可有效的抑制二极管上的电压尖峰，减少了损耗和EMI噪音，可获得比较高的效率。  The present invention adds resonant inductance Lr and resonant capacitor Cr to the secondary side. The soft switching of the diode and the main power tube can be realized by designing appropriate Lr and Cr, and the filter inductor L1 is not needed. It can effectively suppress the voltage spike on the diode, reduce the loss and EMI noise, and obtain relatively high efficiency. the

发明内容 Contents of the invention

本发明的目的在于提供一种LLC谐振型推挽正激变换拓扑，具有可以抑制和消除传统推挽正激电路中副边整流二极管上的尖峰电压、去掉副边整流电路的滤波电感、实现主功率开关管的软开关等优点。  The purpose of the present invention is to provide an LLC resonant push-pull forward conversion topology, which can suppress and eliminate the peak voltage on the secondary rectifier diode in the traditional push-pull forward circuit, remove the filter inductance of the secondary rectifier circuit, and realize the main The advantages of soft switching of the power switch tube. the

本发明是通过以下技术方案实现的：提出一种LLC谐振型推挽正激变换拓扑，借助在推挽正激电路中变压器副边串联谐振电感、谐振电容来抑制和消除副边整流二极管尖峰电压，实现功率开关管软开关，高效率实现直流到直流的电能转换。  The present invention is achieved through the following technical solutions: Propose an LLC resonant push-pull forward conversion topology, suppress and eliminate the peak voltage of the rectifier diode on the secondary side by means of the series resonant inductance and resonant capacitor on the secondary side of the transformer in the push-pull forward circuit , realize the soft switching of the power switch tube, and realize the electric energy conversion from direct current to direct current with high efficiency. the

本发明所述的LLC谐振型推挽正激变换拓扑采用电路实现的，包括电压源Vin，主功率开关管S1和S2，输入滤波电容Cin，包含Np1、Np2、Ns3个绕组的变压器，谐振电感Lr，谐振电容Cr，整流二极管D1、D2、D3、D4，输出滤波电容C3、负载电阻RL。电路的连接关系为：电压源Vin与输入滤波电容Cin 并联，电压源的正端与Cin的正端连接，电压源负端与Cin的负端连接。Np1的同名端连接箝位电容C的一端与功率管S1的漏极；Np1的异名端连接输入电容Cin正端、功率管S2的漏极。功率管S2的源极连接Np2的同名端、箝位电容C的另一端。Np2的异名端连接S1的源极、输入电容Cin的负端。副边Ns的同名端连接谐振电感Lr的一端，Lr的另一端连接谐振电容Cr的一端，谐振电感Lr与谐振电容Cr串联。谐振电容Cr的另一端连接D1的阳极一端、D3的阴极一端；Ns的异名端连接D2的阳极一端、D4的阴极一端。D1的阴极一端、D2的阴极一端连接输出滤波电容C的正端；输出电容C的负端连接D3的阴极一端、D4的阳极一端。D1、D2、D3、D4构成整流桥结构。输出滤波电容C与负载电阻RL并联。输出滤波电容C的正端作为输出电压的正端，输出滤波电容C的负端作为输出电压的负端。  The LLC resonant push-pull forward conversion topology of the present invention is realized by a circuit, including a voltage source Vin, main power switch tubes S1 and S2, an input filter capacitor Cin, a transformer including Np1, Np2, and Ns3 windings, and a resonant inductor Lr, resonant capacitor Cr, rectifier diodes D1, D2, D3, D4, output filter capacitor C3, load resistor RL. The connection relationship of the circuit is: the voltage source Vin is connected in parallel with the input filter capacitor Cin, the positive terminal of the voltage source is connected to the positive terminal of Cin, and the negative terminal of the voltage source is connected to the negative terminal of Cin. The same-named end of Np1 is connected to one end of the clamping capacitor C and the drain of the power transistor S1; the different-named end of Np1 is connected to the positive end of the input capacitor Cin and the drain of the power transistor S2. The source of the power transistor S2 is connected to the terminal with the same name of Np2 and the other terminal of the clamping capacitor C. The opposite end of Np2 is connected to the source of S1 and the negative end of the input capacitor Cin. The end with the same name of the secondary side Ns is connected to one end of the resonant inductor Lr, the other end of Lr is connected to one end of the resonant capacitor Cr, and the resonant inductor Lr is connected in series with the resonant capacitor Cr. The other end of the resonant capacitor Cr is connected to the anode end of D1 and the cathode end of D3; the anode end of Ns is connected to the anode end of D2 and the cathode end of D4. The cathode end of D1 and the cathode end of D2 are connected to the positive end of the output filter capacitor C; the negative end of the output capacitor C is connected to the cathode end of D3 and the anode end of D4. D1, D2, D3, and D4 form a rectifier bridge structure. The output filter capacitor C is connected in parallel with the load resistor RL. The positive terminal of the output filter capacitor C is used as the positive terminal of the output voltage, and the negative terminal of the output filter capacitor C is used as the negative terminal of the output voltage. the

附图说明 Description of drawings

附图1是推挽正激拓扑结构图  Attached Figure 1 is a push-pull forward topology diagram

附图2是本发明拓扑结构图  Accompanying drawing 2 is the topological structure figure of the present invention

附图3是本发明拓扑模态时序图。图中Vgs1为功率管S1的驱动信号波形，Vgs2为功率管S2的驱动信号波形，Vds1为功率管S1的漏源极电压波形，Vds2为功率管S2的漏源极电压波形，iLr为谐振电感Lr电流，VD1为整流管D1两边电压波形，iD1为流过D1的电流波形；VD2为整流管D2两边电压波形，iD2为流过D2的电流波形。  Accompanying drawing 3 is the timing diagram of the topology mode of the present invention. In the figure, Vgs1 is the driving signal waveform of power tube S1, Vgs2 is the driving signal waveform of power tube S2, Vds1 is the drain-source voltage waveform of power tube S1, Vds2 is the drain-source voltage waveform of power tube S2, and iLr is the resonant inductance Lr current, VD1 is the voltage waveform on both sides of the rectifier tube D1, iD1 is the current waveform flowing through D1; VD2 is the voltage waveform on both sides of the rectifier tube D2, and iD2 is the current waveform flowing through D2. the

具体实施方式 Detailed ways

本发明基于推挽正激电路的基础上，在变压器副边与整流桥之间添加谐振网络L、C。具体表现在：电压源Vin与输入滤波电容Cin并联，电压源的正端与Cin的正端连接，电压源负端与Cin的负端连接。Np1的同名端连接箝位电容C的一端与功率管S1的漏极；Np1的异名端连接输入电容Cin正端、功率管S2的漏极。功率管S2的源极连接Np2的同名端、箝位电容C的另一端。Np2的异名端连接S1的源极、输入电容Cin的负端。副边Ns的同名端连接谐振电感Lr的一端，Lr的另一端连接谐振电容Cr的一端，谐振电感Lr与谐振电容Cr串联。谐振电容Cr的另一端连接D1的阳极一端、D3的阴极一端；Ns的异名端连接D2的阳极一端、D4的阴极一端。D1的阴极一端、D2的阴极一端连接输出滤波电容C的正端；输出电容C的负端连接D3的阴极一端、D4的阳极一端。D1、D2、D3、D4构成整流桥结构。输出滤波电容C与负载电阻RL并联。输出滤波 电容C的正端作为输出电压的正端，输出滤波电容C的负端作为输出电压的负端。下面以工作模态进行原理分析：  The present invention is based on the push-pull forward circuit, and adds resonant networks L and C between the secondary side of the transformer and the rectifier bridge. Specifically, the voltage source Vin is connected in parallel with the input filter capacitor Cin, the positive terminal of the voltage source is connected to the positive terminal of Cin, and the negative terminal of the voltage source is connected to the negative terminal of Cin. The same-named end of Np1 is connected to one end of the clamping capacitor C and the drain of the power transistor S1; the different-named end of Np1 is connected to the positive end of the input capacitor Cin and the drain of the power transistor S2. The source of the power transistor S2 is connected to the terminal with the same name of Np2 and the other terminal of the clamping capacitor C. The opposite end of Np2 is connected to the source of S1 and the negative end of the input capacitor Cin. The end with the same name of the secondary side Ns is connected to one end of the resonant inductor Lr, the other end of Lr is connected to one end of the resonant capacitor Cr, and the resonant inductor Lr is connected in series with the resonant capacitor Cr. The other end of the resonant capacitor Cr is connected to the anode end of D1 and the cathode end of D3; the anode end of Ns is connected to the anode end of D2 and the cathode end of D4. The cathode end of D1 and the cathode end of D2 are connected to the positive end of the output filter capacitor C; the negative end of the output capacitor C is connected to the cathode end of D3 and the anode end of D4. D1, D2, D3, and D4 form a rectifier bridge structure. The output filter capacitor C is connected in parallel with the load resistor RL. The positive terminal of the output filter capacitor C is used as the positive terminal of the output voltage, and the negative terminal of the output filter capacitor C is used as the negative terminal of the output voltage. The following is a principle analysis based on the working mode:

如附图3所示  As shown in Figure 3

(1)t1时刻以前，功率管S1漏源极电压已经为零。  (1) Before time t1, the drain-source voltage of power transistor S1 is already zero. the

t1时刻，S1导通，则S1为零电压导通，流过Np1的电流线性增加；副边谐振网络谐振，原边向副边传输能量。此模态中，S1的漏源极电压为0；S2的漏源极电压被箝位在2Vin。副边D2、D3导通，D1、D4处于关断状态。  At time t1, S1 is turned on, then S1 is turned on with zero voltage, and the current flowing through Np1 increases linearly; the secondary side resonant network resonates, and the primary side transmits energy to the secondary side. In this mode, the drain-source voltage of S1 is 0; the drain-source voltage of S2 is clamped at 2Vin. The secondary sides D2 and D3 are turned on, and D1 and D4 are turned off. the

(2)t2时刻S1关断，此时S2亦关断，S1电压由零迅速上升被箝位到2Vin，S2的体二极管导通，漏源极电压为零。直到t3时刻，副边谐振电感电流谐振到零，整流二极管D2、D3零电流关断，无反向恢复尖峰。  (2) S1 is turned off at time t2, and S2 is also turned off at this time, the voltage of S1 rises rapidly from zero and is clamped to 2Vin, the body diode of S2 is turned on, and the drain-source voltage is zero. Until the time t3, the resonant inductor current on the secondary side resonates to zero, the rectifier diodes D2 and D3 are turned off with zero current, and there is no reverse recovery peak. the

(3)t3-t4时，本模态类似于模态1，S2零电压导通，向副边传输能量，S1的漏源极电压箝位在2Vin。副边D1、D4导通，D2、D3处于关断状态。  (3) During t3-t4, this mode is similar to mode 1, S2 conducts at zero voltage, transmits energy to the secondary side, and the drain-source voltage of S1 is clamped at 2Vin. The secondary sides D1 and D4 are turned on, and D2 and D3 are turned off. the

(4)模态4(t4-t5)：本模态类似模态2。  (4) Mode 4 (t4-t5): This mode is similar to mode 2. the

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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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
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CN106329943A (en) * 2016-09-07 2017-01-11 国网江苏省电力公司电力科学研究院 A 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
CN107528477A (en) * 2017-08-08 2017-12-29 西南交通大学 A kind of quasi-resonance soft switch double-transistor flyback DC/DC converters
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
CN109217682A (en) * 2018-09-19 2019-01-15 重庆线易电子科技有限责任公司 Push-pull type electric power converter
CN109378973A (en) * 2018-11-07 2019-02-22 合肥司耀电子科技有限公司 A kind of Push-pull Forward Converter for the high-power boosting of low pressure energy storage device
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
CN113012907A (en) * 2021-02-26 2021-06-22 西安微电子技术研究所 Flat-plate transformer of bias-free voltage push-pull circuit

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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
CN103066880A (en) * 2012-12-07 2013-04-24 武汉华中数控股份有限公司 Push-pull inverter circuit
CN103066880B (en) * 2012-12-07 2014-12-17 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 A low-voltage DC boost conversion and control circuit
CN107528477A (en) * 2017-08-08 2017-12-29 西南交通大学 A kind of quasi-resonance soft switch double-transistor flyback DC/DC converters
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
CN109217682A (en) * 2018-09-19 2019-01-15 重庆线易电子科技有限责任公司 Push-pull type electric power converter
CN109217682B (en) * 2018-09-19 2023-11-28 重庆线易电子科技有限责任公司 Push-pull type power converter
CN109378973A (en) * 2018-11-07 2019-02-22 合肥司耀电子科技有限公司 A kind of Push-pull Forward Converter for the high-power boosting of low pressure energy storage device
CN113012907A (en) * 2021-02-26 2021-06-22 西安微电子技术研究所 Flat-plate transformer of bias-free voltage push-pull 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
CN112671248B (en) * 2021-03-16 2022-02-01 浙江富特科技股份有限公司 Converter device and control method thereof

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Application publication date: 20120613