Semi-bridgeless Active Line Rectification Power Factor Correction Converter with Minimum Current Sensors and Analog control

Semi-bridgeless dual-boost converter is widely used for its high efficiency and better EMI and thermal behavior compared to other power factor correction topologies. A common issue when the converter is driven with a conventional boost converter analog controller is the return current path, thus implying the use of multiple current sensors. The proposal of the following paper is to minimize the number of utilized current sensors to only one shunt resistor, and at the same time overcome the return current path problem in a very simple and effective way (by only using logical ports and taking advantage of the active line rectification circuitry). Details of the proposal and experimental results based on a 500W fan less and low profile power supply, implementing the proposed PFC with 400V output voltage and 65 kHz switching frequency, will be described in this paper.