Research of bridgeless digital PFC technology based on IRMCF343 for air conditioner

IRMCF343 is designed to achieve low cost and high performance one chip solution for digital PFC and PMSM with sensorless control. This paper introduces the digital PFC control algorithm of the chip in detail, designs a novel, bridgeless PFC topology which has simple current sensing circuit and low EMI, and compares bridge-less PFC and conventional Boost PFC circuits. Experimental results verify that the bridgeless PFC has higher power factor and efficiency comparing with conventional Boost PFC. When the designed bridgeless PFC circuit's power is 1 000 W, the power factor is more than 0.98, the THD is less than 10%, the efficiency is more than 0.97, and the EMI test result is lower than standard.