Distortion Due to the Zero Current Detection Circuit in High Power Factor Quasi-Resonant Flybacks

Claudio Adragna, Giovanni Gritti, Santi Agatino Rizzo and Giovanni Susinni
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Claudio Adragna: Industrial and Power Conversion Division Application Laboratory, STMicroelectronics S.R.L, 20864 Agrate Brianza, Italy
Giovanni Gritti: Industrial and Power Conversion Division Application Laboratory, STMicroelectronics S.R.L, 20864 Agrate Brianza, Italy
Santi Agatino Rizzo: Department of Electrical, Electronic and Computer Engineering, University of Catania, 95125 Catania, Italy
Giovanni Susinni: Department of Electrical, Electronic and Computer Engineering, University of Catania, 95125 Catania, Italy

Energies, 2021, vol. 14, issue 2, 1-26

Abstract: In a high-power factor quasi-resonant Flyback, an ideal zero current detection (ZCD) circuit and control circuitry enable the power switch turn-on in the exact instant a zero ringing current is reached after demagnetization. A nonzero current at the turn-on instant affects the input current shape and; consequently, affects its Total Harmonic Distortion (THD). This paper firstly deeply analyzes the effect on the distortion due to a nonideal ZCD circuit. After, some typical implementations of the ZCD circuit and their effect on the THD are analyzed, identifying their pros and cons. Finally, some experimental results are obtained to validate the analytical investigation.

Keywords: converter control; power factor correction; total harmonic distortion; flyback; solid-state lighting (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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