High Voltage LC Resonant Rectifier Without Transformer

Various rectifier circuits such as those for consumer electronics and appliances, rectifier circuits of the capacitor input type are generally used. The various harmonics generated within such a power system become a serious problem. Various studies to reduce these effects have been presented so far. However, most of these employ switching devices, such as MOSFETs and the like. Removing the need for switching devices renders the systems more tolerant to over-load, and brings low RF noise benefits. The authors have proposed a power factor correction scheme using a LC circuit, resonant at a commercial frequency, without using switching devices. This method makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency. It is found that a output high voltage may be readily obtained by means of the LC resonance in this PFC circuit, such that the dc output voltage achieved can be as great as ten times the ac input voltage. In this paper the results are reported and confirmed from both theoretical and experimental implementations.