Indian Journal of Science and Technology

Abstract

Objectives: Digital Pulse Width Modulator (DPWM) remains essential element in power controlling devices that command power switch of power converters. The focus of this study is to structure DPWM of FPGA base for DC chopper. Methods: Buck, Boost, Buck and Boost convertor versions are developed in MATLAB-SIMULINK. Verilog coding is performed for Digital Controller to operate for greater rates, which may be incorporated in high speed surroundings; synthesis is completed utilizing Xilinx ISE, along with Behavioral and Period simulation performed with Xilinx Simulator. After affirmation of code it is downloaded on FPGA Spartan 3AN board. The output is confirmed by means of Oscilloscope. Findings/Application: The resulting DPWM is a high speed and less power consuming architecture for Buck, Boost, Buck and Boost DC-DC converter. The utilization of Gray counter and One-hot encoder in DPWM has helped in speed improvement and reduced power consumption. The grey encoding method has fewer states in comparison with the sequential encoding method, which makes them quicker. The output is a Pulse-Width Modulation (PWM) signal, for varying clock frequency and duty cycle. The power consumed by DPWM for various frequencies was verified in comparison with the high frequency DPWM. For 6 MHz frequency, the power consumed by DPWM is 0.01486 w and that by a high frequency DPWM is 0.01486 w. The proposed DPWM can operate at a maximum frequency of 140.298 MHz. This DPWM is best suited for Buck, Boost, and Buck and Boost DC-DC converters.

Keywords: DC–DC Converter, Field Programmable Gate Arrays (FPGA), Pulse-Width Modulation (PWM), Spartan, MATLAB, SIMULINK