Dynamic Interleaving of Multi-Phase Synchronous DC-DC Converters with ZVS

A decoupled control method is proposed to achieve simultaneous zero-voltage-switching (ZVS) at any load condition and interleaving with dynamic frequency in an N-phase interleaved synchronous DC-DC converter. A computationally inexpensive oscillator network generates N-phase references which retain desired interleaved state at any loading or transient condition. A model based controller calculates the required positive and negative peak phase current references to ensure ZVS. A phase compensator in each phase modulates the current reference to synchronize inductor ripple current with the respective phase reference generated by the oscillator network. The convergence of the oscillator network and the phase compensator are shown using non-linear analysis and experimental results are presented.