具有宽输出电压范围的改进增益单相Buck-Boost PFC变换器及其在通用输入电动汽车应用中的研究

This article introduces an improved gain buck-boost (IGBB) power factor correction (PFC) ac–dc converter for on-board charging (OBC) of electric vehicles (EVs). The proposed converter facilitates efficient charging across a power range of 1–3.3 kW. In conventional buck-boost PFCs characterized by a high gain and a duty ratio approaching unity, substantial voltage gain optimizes the configuration for specific operational conditions. However, the abovementioned issue is resolved in the proposed configuration without additional components. The proposed converter can perform buck and boost operations with a duty ratio not exceeding 0.5, thereby reducing the magnitude of conduction losses and improving efficiency. Finally, a 1 kW down-scaled laboratory prototype is developed and tested to confirm its validity and robustness. It demonstrates a superior performance across a wide output voltage range (48–400 V) for a universal input range from 85 to 265 V ac. The results demonstrate its ability to keep the input current's total harmonic distortion (THD) within specified limits.