Studying the Design and Performance of Conducted- Noise Spectrum Spreading in DC-DC Converters with an FPGA-Based Controller

This paper presents studying the design and performance of conducted-noise spectrum spreading in DC-DC converters. A novel technique for conducted-noise reduction has been proposed in this paper. The proposed technique uses three randomized parameters for generating the switching signals. These parameters are carrier frequency, duty-ratio, and the pulse position. This triple-hybrid spread-spectrum technique has been designed and implemented using field-programmable gate array (FPGA) technology. Moreover, the effect of using the proposed controller on both the conducted-noise and radiated-noise characteristics of the converter has been experimentally investigated. The experimental results show that using the proposed technique significantly improves the conducted-noise spectrum and effectively reduces the noise peaks at both high and low frequency ranges.