Design of a BUCK Converter Achieving TCM-ZVS via V2C Control

Abstract

By analyzing the simplified MOSFET equivalent output capacitance (Coss) model, the minimum reverse current required for soft switching and the corresponding dead time in a synchronous BUCK converter operating in Triangular Current Mode (TCM) are calculated. A readily implementable peak-current control strategy is adopted to achieve zero-voltage switching (ZVS) under TCM. Furthermore, a V2C control method is employed to introduce appropriate slope compensation to the control voltage, effectively eliminating subharmonic oscillations when the duty cycle D>0.5 . The calculated values are verified through simulations in MATLAB/Simulink. Ultimately, a synchronous BUCK converter with a wide output voltage range is designed, which achieves ZVS across the entire operating range in TCM, minimizes inductor current ripple, and features a simple control scheme.