Direct drive of a buck converter by delta-sigma modulation at 13.56-MHz sampling

A direct drive of a buck converter is proposed in this paper. It is achieved by delta-sigma modulation at 13.56-MHz sampling without digital PWM. The high-speed gate driver, which is based on GaN-HEMTs push-pull configuration, is employed to drive a SiC power MOSFET at high switching frequency. By delta-sigma modulation at 13.56-MHz sampling, the output voltage of buck converter is directly controlled in the wide range.