Switched-mode power converters generate electromagnetic emissions which may violate the limits specified in the regulations. Spread-spectrum is an effective technique for reducing the electromagnetic interference of switching devices. The reduction of the magnitude of the first harmonic by the spread-spectrum technique is mainly in focus in the literature. In this paper, the impact on the higher-order harmonics and on the radiated emissions is analyzed. A non-regulated synchronous buck converter is used as a device under test. The radiated emissions of the converter are calculated from the measurements performed by a transverse electromagnetic cell and a hybrid coupler. The measurements are performed for different values of the parameters of the spread-spectrum technique and a reduction of up to 5.7 dB is obtained.

Impact of the spread-spectrum technique on the higher-order harmonics and radiated emissions of a synchronous buck converter / Blecic, Raul; Bacmaga, Josip; Baric, Adrijan; Pareschi, Fabio; Rovatti, Riccardo; Setti, Gianluca. - STAMPA. - (2018), pp. 13-16. (Intervento presentato al convegno 2018 New Generation of CAS, NGCAS 2018 tenutosi a Valletta (Malta) nel 20-23 November 2018) [10.1109/NGCAS.2018.8572290].

Impact of the spread-spectrum technique on the higher-order harmonics and radiated emissions of a synchronous buck converter

Pareschi, Fabio;Setti, Gianluca
2018

Abstract

Switched-mode power converters generate electromagnetic emissions which may violate the limits specified in the regulations. Spread-spectrum is an effective technique for reducing the electromagnetic interference of switching devices. The reduction of the magnitude of the first harmonic by the spread-spectrum technique is mainly in focus in the literature. In this paper, the impact on the higher-order harmonics and on the radiated emissions is analyzed. A non-regulated synchronous buck converter is used as a device under test. The radiated emissions of the converter are calculated from the measurements performed by a transverse electromagnetic cell and a hybrid coupler. The measurements are performed for different values of the parameters of the spread-spectrum technique and a reduction of up to 5.7 dB is obtained.
2018
9781538676813
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2728432