基于双辅助网络的宽软开关范围高效高频链DC-AC变换器

发布时间：2018-11-12 09:20

【摘要】：该文提出一种基于双辅助网络(dual auxiliary network,DAN)的宽软开关范围周波变换类型的高频链逆变(cycloconverter-type high frequency link inverter,CHFLI)电路,简称DAN-CHFLI电路。原边侧采用对称型无源辅助网络(passive auxiliary network,PAN)解决了传统CHFLI电路在空载、轻载及输出电压较小时原边侧开关管无法实现软开关的问题,拓宽了软开关范围,保证了其在任意负载条件下的零电压导通(zero voltage switching,ZVS)。副边侧有源辅助网络(active auxiliary network,AAN)由钳位电容和H桥组成,可以解决漏感与开关管寄生电容谐振造成的电压振荡问题,并辅助周波变换器换流。针对AAN电路,提出一种移相钳位策略:AAN开关管与原边开关管类似,也采用固定占空比方波信号移相调制;且相比原边开关管,AAN开关管延迟导通以实现软开关。文中详细分析了DAN-CHFLI拓扑结构、换流过程、PAN和AAN工作原理及开关管的软开关特性,并设计实验样机验证了理论分析的正确性。
[Abstract]:In this paper, a high frequency chain inverter (cycloconverter-type high frequency link inverter,CHFLI) circuit based on dual auxiliary network (dual auxiliary network,DAN) with wide soft switching range Zhou Bo transform is proposed, which is referred to as DAN-CHFLI circuit. The original side adopts the symmetrical passive auxiliary network (passive auxiliary network,PAN) to solve the problem that the traditional CHFLI circuit can not realize the soft switch in the no-load, light load and small output voltage, and widens the soft switching range. The zero voltage conduction (zero voltage switching,ZVS is guaranteed under any load condition. The auxiliary side active auxiliary network (active auxiliary network,AAN) is composed of clamped capacitance and H bridge, which can solve the voltage oscillation caused by leakage inductance and parasitic capacitor resonance of switch tube, and assist Zhou Bo converter to commutate. For AAN circuit, a phase shift clamp strategy is proposed: the AAN switch is similar to the original side switch and is also modulated by a fixed duty cycle signal phase shift, and compared with the original side switch, the AAN switch is delayed on to realize soft switching. The topology of DAN-CHFLI, the commutation process, the working principle of PAN and AAN and the soft switching characteristics of the switch tube are analyzed in detail. The experimental prototype is designed to verify the correctness of the theoretical analysis.
【作者单位】：合肥工业大学电气与自动化工程学院;格里菲斯大学昆士兰微电子纳米技术研究中心;西南交通大学电气工程学院;
【基金】：国家自然科学基金项目(51307042,51407057)~~
【分类号】：TM46

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