无源软开关三电平Buck／Boost电路设计.pdf无源软开关三电平Buck／Boost电路设计pd

文件名称: 无源软开关三电平Buck／Boost电路设计.pdf

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详细说明：无源软开关三电平Buck／Boost电路设计pdf,无源软开关三电平Buck／Boost电路第1期刘扳来竽:无源软开关三电平Buck/ Boost电路 117 向输出端谐振放电,I1和V为升到I,Dr和D关断,电流继续通过D6使C放 V6(t2) Ii(t)=sin(2(t-t2)Is (4)电,V的缓慢变化为D1的零电压开通提供了条 Ve(t)=VG(t2)cos[w2(t-t2) (5)件该阶段 V6(t)=v6(t2) Ji(t3 阶段4t0.5时三电平无源无损软开关电路工作过程 Fig 4 Operating stages of three-level with passive lossless snubber when D>0.5 v(t)=IZ1sinw1(t-ts))-Vi cos[(t-t5)]+V3, =(;-t)-l(t4) Z1=√D2(C+C1)/C2C,(10 Cs+ cr/L2C8C (11) 开关管S1的峰值电流等于输入电流l与谐振电感峰值电流之和,该峰值出现在V+V=Ⅵ时, I=VV2+(z1)2 (12) to It Ig 13 Ia Is I6 t7 l6时刻,当v(l6)=ⅵ时,D导通,谐振过程图5无源无损软开关三电平电路各器件开关波形结東,此时谐振电感电流 Fig. 5 Corresponding waveform of three-level with l(to)=y(21)2+-⑦G/C.(3) grubbe t6时刻,L2和C4中存储的能量为阶段5t422 压缓升后,折巾选择电路参数所得到的结果,并且开关管关断过释无过压,二极管开通时无过流,验这表明应选较大的Cr并希望r较大; 从(12),(21)式可以看出,G越大,开关81的让了前文的分析.可以看出仿真结果与埋论分析非常吻合电流应力和续流二极管D1的电压应力也将越大利用电路拓扑结构的改进,提出了一种新颖可见,L2,C的取值应综合考虑,折衷选取.根的三电平Brck/Bst无源无损软开关电路拓扑据(21)式,二极管上的过压近似等于√1C/Ca) 着重研究了二电屮电路拓扑的工作原理及实现方所以C与C的比值应尽可能大,若以二极管上的过压为0V为工程设计日标,则应选择C/Cr> 法,将一种无原理性过压的无源无损吸收电路单元应用到三电平Buck/ Boost电路屮,文中详细地 25 介绍了其原理和工作过程,给出了相应的设计要从上面的分析还可看出,开关管S1关断时无点,并进行了仿真研究仿真结果表明所有功率器原理性过压,续流二极管D1开通时无原理性过流件均工作在软开关状态,与硬开关相比,开关管无 5仿真结果原理性过压,且使系统效率提高.同时,由于采用为了验证上述三电平电路控制方法的正确性,的是无源无损软开关技术,并没有带来控制上的进行了仿真研究.仿真中相关电路参数如下:谐复杂性.因此这是一种既有理论意义,又有实用价第1期刘振来等:无源软开关三电平Buck/ Boost电路曾一一 995 997 998 999100099 9,96 9,98 1000 a软开关条件下开关管电压和电流波形 b软开关条件下续流二极管电压和电流波形图7软开关条件下开关管和续流二极管的电压和电流波形 Fig.7 Voltage and current wavcform on power devices under soft switching 值的电路拓扑. 参考文谳 1 LIN B R, LU IIII. Single-phase three-level PWM recTifier[Cl//South Carolina: Proc IEEE PEDS 99, 1999 ]邓焰,何湘宁,钱照明.有源与无源无损吸收网络问.电工技术学报,199,14(增刊):29-34 [3] DENG Y, YE H Y, HE X N. Unified passive circuit for snubber energy recovery in UPS inverters[Cl//Arizona: IEEE PrOc INTEL,FC 2000. 2000 [4何湘宁,邓焰.一种含无源无损耗吸收电路的逆变电源装置:中国,Z!92134900P].19902-13 」吴洪洋.多电平变换器及其相关技术研究D]浙江大学电力电子技术研究所,200 6 SMITH K M Jr, SMEDLEY K M. Engineering design of lossless passive soft switching method for PWM converters with minimum voltage stress circuit cells[C//California: Proc IEEE: APEC 98, 1998 A three-level Buck/ Boost circuit with passive soft-switching LIU Zhen-Lai, DENG Yan2, HE Xiang-ning, WU Hong-gang (1. Department of Physics, Hexi University, Zhangye 734000, Gansu, China; 2. Institute of Power Electronics, Zhejiang University, Hangzhou 310027, China) Abstract: Two passive lossless snubber cells are added to thc three-level circuit to soften the switching processes of the switches and freewheeling diodes and the principle and implementation approaches of thc three-level circuit, are described. a three-level Buck/ Boost topology circuit's operating principles and design considerations are discussed in detail. At last, the simulated result indicates that the circuit can realize the three-levcl function and increase system efficiency as well as lead to not any over- voltage stress oIl Irlail power switches Key words: Buck/Boost converter; passive lossless snubber cell; soft switching

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