Research on A Type of Active Clamped Seven-level PFC Topologies
The conventional two-level totem pole PFC topology has porblems of high voltage stress and low applicable power level. Therefore, a new bridgeless seven-level PFC general topology is proposed in this paper. Use different bidirectional clamped switches to replace the clamped branches of the general topology to obtain the corresponding topology. The I-type seven-level PFC topology is selected as an typical example to analyze the working principle in detail. An auxiliary circuit was used to balance the dc-link capacitor voltages, and combine with carrier in-phase stacking pulse width modulation and voltage and current double closed-loop control strategy to generate the corresponding switching sequences. The simulation results show that of the proposed topology reduces the voltage stress on the switches and achieves high power factor operation, verifying the effectiveness and feasibility thus suitable for applications with higher power levels.
seven-level topologybi-directional switchdouble closed-loop controlcarrier in-phase stackingcapacitor voltage balance
万方数据
维普
