Experimental investigations into the dual-randomization PWM scheme for power converters

• Main Authors: Luk, P.C.K., Drissi, K.E.K.
• Format: Conference Proceeding
• Language: English
• Subjects: Applied sciences; Circuit properties; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electromagnetic interference; Electronic circuits; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; EMP radiation effects; Exact sciences and technology; Filtering; Frequency conversion; Frequency modulation; Integrated circuits; Integrated circuits by function (including memories and processors); Microprocessors; Power electronics, power supplies; Power harmonic filters; Power system harmonics; Pulse width modulation; Pulse width modulation converters; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Signal convertors
• ISSN: 0275-9306; 2377-6617
• DOI: 10.1109/PESC.2004.1354744

Randomized pulse width modulation schemes in power converters have shown potential for relaxing filtering requirements and reducing electromagnetic interference. Majority of existing schemes randomize one modulation parameter to disperse the harmonic contents of the output of the power converter. This paper concerns the investigation of a new dual-randomization scheme by means of extensive experimentation, which includes comparison with existing randomised PWM schemes. The effects of randomizing the two independent modulation parameters, carrier frequency and pulse position, on the harmonic content for a given output of the converter are examined. These experimental results, achieved by a simple microprocessor, underline the superior spectral power spread of the new scheme, and will lead to lower electromagnetic interference and associated adverse effects.