Double boost effect topology for AC/DC converter with unity power factor

Abstract

In this paper a novel AC/DC rectifier topology is proposed. It operates in continuous current and PFC modes. This topology is close from the "VIENNA" one. By involving two coils, it permits to get a "Double Boost Effect", thus improves the rectifier features. Indeed, it exhibits the following advantages: (a) a Boost and a Buck-Boost effects operate and permit to transmit the energy to the DC capacitors even if the mains voltage is positive or negative, (b) for given capacitor values, the DC ripples decrease, (c) the mains current is under control of a self-oscillating controller which accurately tracks its reference. Furthermore, the "VIENNA I" rectifier power cell is not able to transmit the energy to both DC capacitors during the positive or negative half-period of the mains. The proposed rectifier can do it. The disadvantage of the investigated topology is to implement two coils. But if the sum of the "Double Boost Effect" topology coil inductance values equals the "VIENNA I" coil inductance one, the AC/DC "Double Boost Effect" rectification works better in term of DC ripple amplitudes. Then, it could be possible to reduce the "Double Boost Effect" rectifier capacitor values. In the proposed work, the operating of this new rectifier is studied and verified. Equations are given in order to depict all of the topology states. Simulations and experimental tests confirm the analysis results.