Transcription of Design equations of high-power-factor flyback converters ...
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Design equations of high-power-factor flyback converters ...
INTRODUCTION Three different configurations that an L6561-basedflyback converter can assume have been are illustrated in fig. 1. Configurations a) and b) are basically conventionalflyback converters . The former works in TM (Transi-tion Mode, on the boundary between continuousand discontinuous inductor current mode), thereforeat a frequency depending on both input voltage andoutput current. The latter works at a fixed frequency,imposed by the synchronisation signal, and is there-fore completely equivalent to a flyback converterbased on a standard PWM c), which most exploits the aptitude ofthe L6561 for performing power factor correction,works in TM too but quite differently: the input ca-pacitance is so small that the input voltage is very close to a rectified sinusoid.
APPLICATION NOTE DESIGN EQUATIONS OF HIGH-POWER-FACTOR FLYBACK CONVERTERS BASED ON THE L6561 by Claudio Adragna Despite specific for Power Factor Correction circuits using boost topology, the L6561 can be suc-cessfully used to control flyback converters. Among the various configurations that an L6561-based
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