Abstract

This paper proposes a novel power-factor corrector (PFC) with programmable output voltage, which is mainly composed of two-phase transition-mode (TM) boost-type power-factor correctors (PFCs), a coupled inductor and a control section. 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. 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-in half duty cycle can reduce the conduction losses of the switches and both the turns and diameters of the inductor windings. The advantages of a TM boost 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. For different output requirement in this proposed model, we have introduced a user programmable output voltage by changing the switching period by using a microcontroller. Thereby achieving the desired output voltage by single micro switch press, various advantages of power limiting, monitoring, protection (The advantage of associating of microcontroller) and getting all advantages of resonant converter as discussed before. 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 360V, 380V, 400V and 420V selectable output dc voltages and a 200-W output power to verify its feasibility.Conducted on a prototype with a universal line voltage, a 360V, 380V, 400V and 420V selectable output dc voltages and a 200-W output power to verify its feasibility

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