Dove, AlbertHofsajer, INaude, J2018-02-122018-02-122017-01Dove, A., Hofsajer, I. and Naude J. 2018. Spectral shaping of a randomized PWM DC-DC converter using maximum entropy probability distributions. In: Proceedings of the 25th Southern African Universities Power Engineering Conference (SAUPEC 2017), Stellenbosch, South Africa, 30 January - 1 February 2017978-0-0620-74503-1http://www0.sun.ac.za/saupec2017/Papers/PaperView.php?%20PublicationID%20=%201781http://hdl.handle.net/10204/10034Proceedings of the 25th Southern African Universities Power Engineering Conference (SAUPEC 2017), 30 January - 1 February 2017, Stellenbosch, South AfricaThe use of random pulse width modulation has been known to help reduce Electromagnetic Interference (EMI) in power converters. The procedure for reducing EMI using Random Pulse Width Modulation (RPWM) techniques has always been to spread the harmonic power in the power density spectrum -otherwise caused by periodic PWM- by randomizing the PWM. This in turn reduces the amplitude of the EMI noise. Probability distribution functions (PDF) determine the extent to which EMI amplitudes could be reduced. This paper presents probability distribtions of the PWM which will result in the spreading out of harmonic power in the power density spectrum. The relationship between probability distributions and spreading out of harmonic power whilst maintaining constraints in a DC-DC converter is investigated. A probability distribution whose aim is to ensure maximal harmonic spreading and yet mainaint constraints is presented. The PDFs are determined from a direct application of the method of Maximum Entropy. It is shown that given a pool of randomized parameters, there exists a region through which maximum spreading happens and how this spreading out is compromized by having constraints.enElectromagnetic interference distributionMaximum entropyPower density spectrumProbability distributionRPWMRandom Pulse Width ModulationConference PresentationDove, A., Hofsajer, I., & Naude, J. (2017). Spectral shaping of a randomized PWM DC-DC converter using maximum entropy probability distributions. SAUPEC 2017. http://hdl.handle.net/10204/10034Dove, Albert, I Hofsajer, and J Naude. "Spectral shaping of a randomized PWM DC-DC converter using maximum entropy probability distributions." (2017): http://hdl.handle.net/10204/10034Dove A, Hofsajer I, Naude J, Spectral shaping of a randomized PWM DC-DC converter using maximum entropy probability distributions; SAUPEC 2017; 2017. http://hdl.handle.net/10204/10034 .TY - Conference Presentation AU - Dove, Albert AU - Hofsajer, I AU - Naude, J AB - The use of random pulse width modulation has been known to help reduce Electromagnetic Interference (EMI) in power converters. The procedure for reducing EMI using Random Pulse Width Modulation (RPWM) techniques has always been to spread the harmonic power in the power density spectrum -otherwise caused by periodic PWM- by randomizing the PWM. This in turn reduces the amplitude of the EMI noise. Probability distribution functions (PDF) determine the extent to which EMI amplitudes could be reduced. This paper presents probability distribtions of the PWM which will result in the spreading out of harmonic power in the power density spectrum. The relationship between probability distributions and spreading out of harmonic power whilst maintaining constraints in a DC-DC converter is investigated. A probability distribution whose aim is to ensure maximal harmonic spreading and yet mainaint constraints is presented. The PDFs are determined from a direct application of the method of Maximum Entropy. It is shown that given a pool of randomized parameters, there exists a region through which maximum spreading happens and how this spreading out is compromized by having constraints. DA - 2017-01 DB - ResearchSpace DP - CSIR KW - Electromagnetic interference distribution KW - Maximum entropy KW - Power density spectrum KW - Probability distribution KW - RPWM KW - Random Pulse Width Modulation LK - https://researchspace.csir.co.za PY - 2017 SM - 978-0-0620-74503-1 T1 - Spectral shaping of a randomized PWM DC-DC converter using maximum entropy probability distributions TI - Spectral shaping of a randomized PWM DC-DC converter using maximum entropy probability distributions UR - http://hdl.handle.net/10204/10034 ER -