AC/DC converter and AC/DC conversion method using the same

摘要

Disclosed herein are an AC/DC converter which is simple in circuit configuration, generates little ElectroMagnetic Interference (EMI) and has no transformer so that it can be reduced in weight and size and improved in AC/DC conversion efficiency, and an AC/DC conversion method using the same. The AC/DC converter includes a rectification circuit (102) for converting a commercial AC(85-264V) voltage into a ripple AC voltage, a first control circuit (103) for comparing the converted ripple AC voltage with a reference voltage and outputting a first pulse control signal as a result of the comparison, a first switching circuit (104) for switching and outputting the ripple AC voltage from the rectification circuit in response to the first pulse control signal outputted from the first control circuit, and a first charge storage circuit (108) for smoothing the ripple AC voltage outputted from the first switching circuit to convert it into a primary DC voltage.