Smart-Switching Pulse Width Modulation for High-Density Power Conversion

Power electronic converters comprise of solid-state switching devices and energy storage elements. With technological advancements in device technology, the power density of converters has significantly reduced since the 1970s. This paper discusses the principles of smart-switching pulse width modulation (PWM) approaches that can significantly reduce the energy storage requirements for high-density power conversion (0.1-10 mu F vs. 100-1000 mu F). Smart switching approaches feature an intelligent switching sequence, accurate duty ratio calculation, and robust fast bandwidth controls. Along with a discussion on the main features of smart-switching, several applications of smart-switching PWM approaches are presented with simulation and experimental results.