中文摘要：

提出了一种电压钳位零电压开关（zero voltage switch,ZVS）型推挽式高频环节DC/AC变换器,首先给出了所提出高频环节DC/AC变换器的推衍过程,针对所推衍出的拓扑结构给出了其开关控制策略。重点叙述了其稳态工作原理,并采用状态空间法建立了变换器的输入输出平均模型,然后分析了该变换器的主要特性。通过对比分析发现,所提出的DC/AC变换器与移相全桥式DC/AC变换器具有相类似的特性,变压器原边功率管S_1、S_2很容易实现ZVS开通,功率管S_3在漏感能量足够的条件下实现ZVS开通,且其两端电压可被钳位于输入电压,变压器副边的周波变换器则很容易实现ZVS换流。此外,相比传统推挽式DC/AC变换器,所提出变换器解决了其硬开关、损耗大的问题。最后,设计了一台功率为500VA,输入输出为48VDC/110V 50Hz AC原理样机,实验结果验证了所提出变换器的工作原理及理论分析的正确性,变换器效率可达91.5%以上。

英文摘要：

One zero voltage switch （ZVS） push-pull high frequency link DC/AC converter with voltage clamping is proposed. Firstly, the evolution of the proposed DC/AC converter is presented. Then, the switching strategy is proposed and the steady working principle is analyzed in detail. The average model of the proposed converter is discussed by using the state-spacing- averaging approach. By contrast, it is found that the proposed converter and the phase-shift full-bridge DC/AC converter have similar characteristics. Switches $1, $2 can realize ZVS turn-on easily and the auxiliary switch $3 can achieve ZVS ~rn-on under enough energy stored in leakage inductor. Meanwhile, the voltage of $3 can be clamped at Uin with a clamp diode. In addition, the cycloconverter can also achieve ZVS commutation easily. In addition, the proposed topology solves the problem of hard-switching that resulting in high switching losses. Finally, one prototype of 500VA/ 48VDC/110V/50Hz AC is developed and the test results show that the theoretical analyses and principle are correct. The efficiency of the prototype can reach 91.5%.