02-09-2013, 04:04 PM
SINGLE PHASE SINGLE-STAGE THREE LEVEL POWER FACTOR CORRECTION AC-DC CONVERTER
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Abstract
A new three-level single-stage power factor-corrected ac/dc converter is presented. The proposed circuit integrates the operation of a boost power factor correction converter and a three-level dc/dc converter into one converter. It does not have the problem of high component stress due to high rising intermediate bus voltages at light load conditions that other single-stage converters have because of its three-level structure. It can operate over a wider load range with significantly less output inductor current ripple moreover, its input current has little distortion. In the paper, the operation of the new converter is explained in detail and analyzed, its steady-state characteristics are determined, and its design is discussed. Experimental results obtained from a prototype are presented to confirm the feasibility of the new converter. Multilevel converters have been proposed to try to reduce the peak voltage stresses of the converter devices, as the switch voltage is limited to half the dc-bus voltage. There are some multilevel voltage-fed SSPFC converters which have been presented in and still have many of the problems of previously proposed SSPFC converters stated above, include distorted input currents, discontinuous output current, and the use of variable switching frequency.