Input Voltage Feedforward and Feedback Control of Coupled Inductor SIDO Buck Converter

Abstract

This paper presents the input voltage feedforward and feedback (IVFF) control for coupled inductor single-input dual-output (CI-SIDO) buck converter. In IVFF, the duty cycle is modulated directly using the input voltage and hence, improves the audio-susceptibility of CI-SIDO buck converter. The feedforward and feedback control is designed by developing the small-signal model (SSM) of CI-SIDO buck converter operating in continuous conduction mode (CCM). The SSM is developed considering the circuit parasitics. It is observed that with feed forward control, output voltage experience no overshoot for input voltage variation. The analysis is verified using the simulation results.