Three-level Power Factor Correction Control Strategy in Full-duty Range
In view of low tenability of parameters of domain controllers in different working areas of three-level Boost PFC converters,a control strategy with full duty cycle range was proposed.First according to different duty cycle intervals,the inductor current and output voltage are selected to establish a unified state-space equation under full duty cycle.Second the interleaved control method of 180°phase shift is used to reduce output voltage and inductor current ripple of the converter.Then the proportional voltage balance controller is designed to achieve midpoint potential balance.Finally simulation model of TLBP converter circuit is built by PSIM and simulation results show that compared with conventional average current control,the proposed strategy achieves significantly reduced output voltage ripple and hardly distorted inductor current waveform,and thereby is feasible and effective.
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