Design and implementation of fpga based digital switching controller for Dc-Dc converters used in System-On-A-Chip applications

Abstract

DC-DC converters are electronic devices that are used to change DC electrical power efficiently from one voltage level to another. This paper proposes a new Digital Pulse Width Modulator (DPWM) which generates variable duty cycle PWM pulse and it can be used as switching controller for DC-DC converters used in battery powered portable electronic and mobile devices. DPWM utilizes the advantage of Digital Clock Manager (DCM) present in FPGA to multiply the clock frequency to eliminate the clock skew. The proposed DPWM uses the four bit gray counter and one hot encoder with SR flip flop to generate the PWM pulse whose duty cycle can be varied according to the control signal. To verify the results DPWM was implemented in SPARTAN 3A.