Application of chaotic pulse width modulation control for suppressing electromagnetic interference in a half-bridge converter

Abstract

It was proposed in the former research that chaos control can be used to suppress electromagnetic interference (EMI) in DC–DC converters. Analysis on a half-bridge converter is detailed in this study. Here, the practical example of the power supply of personal computers is given to show that, with an external chaotic signal to a pulse width modulation control circuit, the proposed approach can reduce EMI by reducing the amplitudes of power signals such as transformer current and output inductor currents at multiples of fundamental frequency.

Keywords

• computer power supplies
• bridge circuits
• DC-DC power convertors
• chaos
• electromagnetic interference
• interference suppression
• PWM power convertors
• electric current control
• nonlinear control systems
• transformers
• chaotic pulse width modulation control circuit
• electromagnetic interference suppression
• EMI reduction
• half-bridge converter
• DC-DC converters
• personal computer power supply
• external chaotic signal
• power signal amplitude reduction
• transformer current
• output inductor currents