FPGA based predictive deadbeat control for high switching frequency SEPIC

This paper presents the application of predictive deadbeat control to the high switching frequency DC/DC Single-Ended Primary Inductor Converter (SEPIC). An extended Kalman observer with load variation estimation is designed to achieve current sensorless operation of the controller. A hybrid Delta-Sigma (Δ-Σ) Digital Pulse Width Modulation (DPWM) is used to effectively achieve 11-bit resolution at high-frequency and reduce the system clock frequency. The proposed DPWM along with the predictive deadbeat control algorithm is validated by using a Virtex-II FPGA. Experimental studies are conducted for a laboratory prototype with switching frequency of 500kHz. Simulation and experimental results prove the performance of the proposed solution.