Point-of-Load (PoL) and Multi-Phase Converters
Technical Lecture Session
Hybrid DC-DC Converters
Resonant converter, series-capacitor buck converter, zero-voltage switching (ZVS), zero-current switching (ZCS)
The Series-Capacitor Buck (SCB) converter lowers the switching loss, doubles the duty ratio, and equalizes the current between two phases. A Resonant Series-Capacitor Buck (RSCB) converter is realized by adding a parallel resonant tank next to the series-capacitor Cs. All switches turs on into zero-voltage (ZVOn) and low-side switches turn off from zero-current (ZCOff). The voltage gain is still linearly proportional to the off-time of the low-side switches. The resonant tank generates additional loss and increases voltage stress of the low-side switches. A 2-MHz prototype with full load efficiency of 97.3%, 48 V at the input and 7 V, 20 A at the output was built to verify the design.