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High Step-Down Transformerless Single-Stage Single-Switch AC/DC Converter
Abstract—This
paper presents a high step-down tranformerless single-stage single-switch ac/dc
converter suitable for universal line applications (90–270 Vrms ). The topology
integrates a buck-type power-factor correction (PFC) cell with a buck–boost
dc/dc cell and part of the input power is coupled to the output directly after
the first power processing. With this direct power transfer feature and sharing
capacitor voltages, the converter is able to achieve efficient power
conversion, high power factor, low voltage stress on intermediate bus (less
than 130 V) and low output voltage without a high step-down transformer. The
absence of transformer reduces the component counts and cost of the converter.
Unlike most of the boost-type PFC cell, the main switch of the proposed
converter only handles the peak inductor current of dc/dc cell rather than the
superposition of both inductor currents. Detailed analysis and design
procedures of the proposed circuit are given and verified by experimental
results.
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