双模式控制DC/DC-DC/AC变换器系统DC/AC级参数设计方法

This article proposes a new DC/AC stage parameter design method for the DMC DC/DC–DC/AC converter system. The proposed method makes an overall design of the DC/AC stage parameter including switching frequency, inductor, and capacitor. The relationships among switching frequency, inductor, and capacitor values, junction temperature, total loss, and efficiency are analysed. To fully release the performance of the DC/AC stage switches, the switching frequency is increased to 100 kHz with slight influence on total loss and efficiency. The LC filter for the DMC DC/DC–DC/AC converter system is diminished by more than 50% in a 1 kW case, which reduces weight, volume, and cost of the converter system. Furthermore, compared with other methods to increase switching frequency, there are no additional WBG devices or auxiliary circuits.