Megahertz-Frequency Isolated Resonant dc-dc Converter using Impedance Control Network for High-Efficiency Wide-Range Operation

This paper introduces a new isolated resonant dc-dc converter topology based on the recently proposed impedance control network (ICN) converter architecture. This new converter maintains very high efficiency by achieving zero voltage switching (ZVS) and near zero current switching (ZCS) across a very wide operating range. Additional performance enhancement is achieved through a new design methodology that minimizes switching and conduction losses. This ICN converter implementation incorporates full-bridge synchronous rectification and is well-suited for low output voltage and high output current applications. A prototype 550 W, 1 MHz ICN converter designed to operate over an input voltage range of 36 V to 60 V, an output voltage range of 34 V to 55 V, and a 10:1 output power range is built and tested. The prototyped ICN converter achieves a peak efficiency of 97.6%, maintains full power efficiency greater than 96.5% at 34 V output voltage across the nearly 2:1 input voltage range, and maintains full power efficiency above 95.3% across its full input and output voltage range. It also maintains efficiency above 93.6% over a 10:1 output power range across its full input and output voltage range owing to the use of burst-mode control.