Patent
Dc-to-dc converter
Kengo Koike,Kei Okada +1 more
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TLDR
In this article, a flyback period determination circuit is connected to a tertiary winding of the transformer for providing a signal indicative of a fly-back period during which a fly back voltage exists across the transformer tertiary after the switch is turned off each time.Abstract:
A transformer has a primary winding connected between a pair of dc input terminals via an on-off switch, and a secondary winding connected between a pair of dc output terminals via a rectifying and smoothing circuit The output voltage applied from the rectifying and smoothing circuit to the load is held constant by switching the input voltage through feedback control The switch is driven in either of two different prescribed modes depending upon whether the converter is under normal or light load In order to ascertain the load magnitude a flyback period determination circuit is connected to a tertiary winding of the transformer for providing a signal indicative of a flyback period during which a flyback voltage exists across the transformer tertiary after the switch is turned off each time Each flyback period is compared with two different reference periods of time for hysteretic determination of whether the converter is under normal or light load Several other embodiments are disclosedread more
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References
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