具有简单辅助电路的并联谐振直流环节软开关逆变器

发布时间：2018-12-15 08:36

【摘要】：为克服传统硬开关逆变器存在的缺点,提出了一种新型并联谐振直流环节软开关逆变器,其辅助谐振电路含有耦合谐振电感,结构相对简单,有利于降低硬件成本。通过辅助电路的谐振使直流母线电压下降到零时,逆变器的主开关可以完成零电压开关,同时辅助开关也可以在辅助谐振电路的工作过程中完成软开关,而且直流母线零电压持续时间可以自由选择,与负载电流和谐振参数无关。文中依据不同工作模式下的等效电路图,对其工作原理进行了分析,给出了软开关的实现条件和逆变器的控制方法。制作了一个140W的实验样机,实验结果表明逆变器的主开关和辅助开关器件都实现了软开关,所以该软开关逆变器能有效地降低开关损耗和提高效率。
[Abstract]:In order to overcome the shortcomings of the traditional hard-switching inverter, a new type of parallel resonant soft-switching inverter with DC link is proposed. The auxiliary resonant circuit contains coupling resonant inductance, and the structure is relatively simple, which is helpful to reduce the cost of hardware. The DC bus voltage is reduced to 00:00 by resonance of auxiliary circuit. The main switch of inverter can complete zero voltage switch, and the auxiliary switch can also finish soft switch in the working process of auxiliary resonant circuit. Moreover, the zero voltage duration of DC bus is free to choose, independent of load current and resonant parameters. According to the equivalent circuit diagram of different working modes, the working principle of the circuit is analyzed, and the realization conditions of soft switch and the control method of inverter are given. An experimental prototype of 140W is made. The experimental results show that both the main switch and the auxiliary switch of the inverter achieve soft switching, so the soft-switching inverter can effectively reduce the switching loss and improve the efficiency.
【作者单位】：辽宁石油化工大学信息与控制工程学院;
【基金】：国家自然科学基金资助项目(51207069)
【分类号】：TM464

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