The transformerless ac-dc and dc-dc converters with a diode-capacitor voltage multiplier

This paper presents a transformerless ac-dc and or dc-dc converter with a high output voltage multiplicity, which contains only one switch. The converter consists of the inverter and diode-capacitor multiplier (DCM), which provides the voltage gain equal to the double number of the multiplier steps. In the case of the ac-dc conversion the proposed converter offers practically unit power factor and provides a sine wave input current. The analysis of the steady state as well as the transient behavior of the DCM is given and a simplified equivalent circuit is proposed. The prototype of the DCM has been built and tested to show the validity of the proposed converter. The theoretical analysis, the computer simulation results and the experimental testing results are in good agreement.