A novel control for two-stage DC/DC converter with fast dynamic response

This paper investigates the dynamic response relationship with nonlinear gain instead of conventional linear relationship in two-stage DC-DC converter, and proposes a simple novel control method for two-stage converter with fast dynamic response; it has large operating duty ratio and large voltage step-down ratio, suitable for low voltage application. Most importantly, it can achieve fast dynamic response without pushing higher frequency due to its large voltage gain slew rate. Finally an experimental prototype was carried out to verify the theoretical analysis.