Inductorless DC/DC boost converter using switched-capacitor circuit

A new switched-capacitor (SC)-based DC/DC boost converter is proposed. The basic concept of energy transfer is realized by two symmetrical converter cells operating in two cyclical phases. The superior features of this converter are its improved regulation capability and continuous input current waveform which results in less electromagnetic interference (EMI) due to the conducted emissions than the classical SC-based converters. The DC voltage conversion ratio is determined by a control voltage applied to the semiconductor switch, namely quasi-switch, in each cell for controlling the charging trajectory of the capacitor in order to maintain the output regulation, The new converter is analyzed by using state-space averaging approach. The static and dynamic characteristics, including the small-signal AC input-to-output and control-to-output transfer functions, are derived. A prototype of 20 W, 6 V/9 V, DC/DC boost converter has been built. As the converter does not contain any inductive element, the converter can be designed in small size, light weight, high power density and is possible to be fabricated by IC technology