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中文摘要：
为提高逆变器的效率和简化控制方式,提出一种单相全桥谐振直流环节软开关逆变器。通过单独开关控制辅助谐振电路,使直流环节电压在逆变器主开关需切换时下降到零,逆变器的主开关可以实现零电压开关,同时辅助开关也可以实现零电压开关。而且,逆变器直流环节电压不会超过直流源电压。由于谐振过程和零电压持续时间都较短,因而可以减少功率消耗和提高直流电压的利用率。依据不同工作模式下的等效电路,分析其工作原理,结合相平面分析法研究其动力学行为,给出了软开关实现条件和参数设计过程,搭建了实验样机。实验结果表明逆变器的主开关和辅助开关都实现了软开关,可以有效地降低该软开关逆变器的开关损耗和提高其效率。
英文摘要：
A single-phase full-bridge resonant DC-link soft-switching inverter was proposed to improve the efficiency and simplify the control method.When main switches in the inverter needed operating,the DClink voltage decreased to zero via the single switch which controlling the resonance of the auxiliary circuit.Then all main switching devices in the inverter were operated under zero-voltage condition and auxiliary switching device was also operated under zero-voltage condition.The voltage across the DC-link inverter devices was limited to the input source voltage.Because the process of the resonant and the zerovoltage time was short,it could reduce the power loss and improve the efficiency by using the DC-source voltage.The operation principle was analyzed based on the equivalent circuits at different operation modes.The phase-plane analysis technique was established in order to study transient dynamics.The conditions of soft-switching and the process of parameter design were also achieved.A laboratory prototype was built.The experimental results demonstrate that soft-switching operation of all switching devices are realized.Therefore,the soft-switching inverter presented effectively reduces switching loss and improves efficiency.
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