Implementing Pseudo-Random Control in Boost Converter: An Effective Approach for Mitigating Conducted Electromagnetic Emissions

Abstract

Currently, pulse width modulation (PWM) is a prevalent technique in the field of DC-DC converter control. Its primary objectives encompass maintaining the regulation of the converter's output voltage and improving the load's performance by mitigating the adverse effects caused by harmonic distortions. Unfortunately, the utilization of PWM is associated with significant levels of residual harmonics, characterized by notable amplitudes and frequencies, which have the potential to induce mechanical vibrations, acoustic disturbances, and electromagnetic interference (EMI).To address this challenge, a method known as pseudo-random modulation (PRM) has been developed. In comparison to traditional PWM, PRM offers ease of implementation and high efficacy in EMI mitigation. PRM achieves this by distributing harmonic power across a broader frequency range, thereby reducing the prominence of high-amplitude harmonics at specific frequencies. Within the context of Spread Spectrum Modulation (SSM), this study extensively explores diverse converter topologies and proposes an innovative hardware implementation using the cost-effective Atmega328p microcontroller. Furthermore, the study scrutinizes the consequences of implementing this randomized control strategy to reduce electromagnetic emissions from a Boost converter, a well-recognized source of significant interference in its operational environment. Ultimately, the aim is to evaluate the effectiveness of these applied methodologies in achieving the maximum dispersion of the power spectrum, thereby enhancing overall electromagnetic compatibility.

Strategic electromagnetic interferences suppression in boost converters: zero-switch techniques

“…To address this challenge, we propose the application of the soft switching technique, aimed at reducing power losses and attenuating voltage or current gradients, thereby contributing to enhanced Int J Adv Appl Sci ISSN: 2252-8814  electromagnetic compatibility [8]- [10]. Additionally, techniques such as filtering and pseudo-random modulation are implemented to mitigate electromagnetic interference (EMI) from power converters [11], [12]. The application of pseudo-random modulation at the control level serves to disperse harmonic energy across a wide frequency range, and its integration with resonant switching holds promise for meeting electromagnetic compatibility (EMC) standards [13], [14].…”