Abstract—This
paper proposes a novel power-factor corrector (PFC), which is mainly composed
of two-phase transition-mode (TM) boost-type power-factor correctors (PFCs) and
a coupled inductor. By integrating two boost inductors into one magnetic core,
not only the circuit volume is reduced, but also the operating frequency of the
core is double of the switching frequency. Comparing with single-phase TM boost
PFC, both the input and output current ripples of the proposed PFC can be
reduced if the equivalent inductance of the coupled inductor equals the
inductance of singlephase TM boost PFC. Therefore, both the power-factor value and
the power density are increased. The proposed topology is capable of sharing
the input current and output current equally. A cut-inhalf duty cycle can
reduce the conduction losses of the switches and both the turns and diameters
of the inductor windings. The advantages of aTMboost PFC, such as
quasi-resonant (QR) valley switching on the switch and zero-current switching
(ZCS) of the output diode, are maintained to improve the overall conversion
efficiency. Detailed analysis and design procedures of the proposed topology
are given. Simulations and experiments are conducted on a prototype with a
universal line voltage, a 380-V output dc voltage and a 200-W output power to
verify its feasibility.
(Index
Terms—Coupled inductor, power factor corrector, push– pull topology,
quasi-resonant (QR) converter.)
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