A Novel Zero Voltage Transition (ZVT) Technique based Closed Loop Control of Boost Power Factor Correction (PFC) Converter with EMI Filter

摘要

A novel zero voltage transition (ZVT) technique based closed loop control of boost power factor correction (PFC) converter with electro magnetic interference (EMI) filter is presented in this paper. It operates at a fixed frequency while achieving zero voltage turn-on of the main switch and zero current turn-off of the boost diode. This is accomplished by employing resonant operation only during switch transitions. During the rest of the cycle, the resonant network is essentially removed from the circuit and converter operation is identical to its non-resonant counterpart. A prototype of 1000 W is built to test the proposed topology. The input voltage is from 170 V rms to 250 V rms. The output voltage is 400V. The operation frequency is 250 kHz. This technique increases the efficiency upto 95% and power factor upto 0.99.