Single inductor three-level bridgeless boost power factor correction rectifier with nature voltage clamp

This study proposes a single-phase bridgeless three-level boost power factor correction (PFC) converter with nature voltage clamp. The proposed converter can be treated as two boost converters in series, and the charging and the discharging of the inductor are performed in different boost sub-circuits. Two slow diodes are used as rectifier diodes and voltage clamping diodes at the same time. As a result, nature voltage clamp is achieved. Furthermore, the proposed converter has high device utilisation factor and requires only one inductor, which simplifies the whole circuit. The detailed operational principle and design consideration are discussed. A 1 kW experimental prototype with universal input is built to verify the theoretical analysis. The result shows that the efficiency is above 94 at full load under 90 V line input and the maximum efficiency is 98.4 .