Abstract
A new and simple but effective electromagnetic interference suppression technique based on field programmable logic array (FPGA) technology to provide a significant EMI noise attenuation in DC-DC converters is discussed. The voltage controlled boost converter for EMI reduction is analyzed using FFT under traditional PWM technique and chaotic mode operation. This technique aids the DC-DC converters to comply in specified EMI limits and replace conventional bulky passive filter with a simple passive filter. A prototype model has been tested and hardware results show significant reduction of EMI in chaotic mode operation of the boost converter.
Highlights
Electromagnetic iterference is a man-made or natural electromagnetic disturbance signal which results in unacceptable response and sometimes in malfunctioning of an electrical or electronic device
The hardware prototype of passive filter [7] is designed for Electromagnetic Interference (EMI) filtering and later added to the chaotically switched DC-DC converter in which the hard ware prototype is driven by pulses generated using the costeffective field programmable logic array (FPGA)
The line impedance stabilization network (LISN) is stabilizing the impedance of the source and the circuit for the accurate measurement of conducted EMI generated in the boost converter
Summary
Electromagnetic iterference is a man-made or natural electromagnetic disturbance signal which results in unacceptable response and sometimes in malfunctioning of an electrical or electronic device. The EMI filters are traditionally used in power converters to attenuate switching noise and to meet the EMI standards for many years now. Incorporation of chaotic modulation, a type of random modulation method, is effective in suppression of EMI for a wider range of frequency. In comparison, chaotic PWM method suppresses the EMI at switching itself. By combining the advantages of EMI filtering with chaotic PWM switching, it is possible to achieve effective spectral peak reduction in the network. The hardware prototype of passive filter [7] is designed for EMI filtering and later added to the chaotically switched DC-DC converter in which the hard ware prototype is driven by pulses generated using the costeffective FPGA.
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