Spread Spectrum Technique to Reduce EMI Emission for an LLC Resonant Converter Using a Hybrid Modulation Method

Spread Spectrum Technique to Reduce EMI Emission for an LLC Resonant Converter Using a Hybrid Modulation Method

A spread spectrum technique has been introduced to mitigate electromagnetic interference (EMI) in power converters. However, this technique is difficult to apply to resonant converters that use a pulse frequency modulation (PFM), because the spread spectrum can induce large output voltage fluctuatio...

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Veröffentlicht in:IEEE transactions on power electronics 2018-05, Vol.33 (5), p.3717-3721
Hauptverfasser: Park, Hwa-Pyeong, Kim, Mina, Jung, Jee-Hoon
Format: Artikel
Sprache:eng
Schlagworte:
Electric potential
Electromagnetic interference
Electromagnetic interference (EMI)
Electronics
Emissions control
Frequency modulation
Frequency variation
Hybrid control
LLC resonant converter
Load management
output voltage regulation
Power converters
Pulse frequency modulation
Resonant frequency
Spread spectrum
Spread spectrum transmission
Switching frequency
Voltage control
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Beschreibung
Zusammenfassung:A spread spectrum technique has been introduced to mitigate electromagnetic interference (EMI) in power converters. However, this technique is difficult to apply to resonant converters that use a pulse frequency modulation (PFM), because the spread spectrum can induce large output voltage fluctuations by PFM's switching frequency variations. In this letter, a hybrid control method using the PFM and phase shift modulation is proposed to obtain tight output voltage regulation under the spread spectrum operation of an LLC resonant converter. The performance of the proposed hybrid control method is experimentally verified using a 500 W prototype LLC resonant converter.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2766284