High efficiency PWM zero-voltage-transition boost converter: AC small signal analysis

A dc-dc boost converter operating under zero-voltage-transition conditions is presented. Its excellent performance deserves a detailed analysis. An equivalent circuit is derived in order to characterize the switching sequence. It contains an equivalent current source and an equivalent voltage source whose nonlinear functions take different forms for each switching topology. The small-signal open-loop and closed-loop transfer functions, including the audio susceptibility are derived. Design-oriented stability criteria are formulated. The theoretical time-domain response and Bode characteristics are checked by experiments or PSPICE simulation.