Single-ended fly-back converter switching power supply principle diagram

Published:2011/4/19 1:40:00 Author:May | Keyword: Single-ended, fly-back, converter switching, power supply | From:SeekIC

Single-ended fly-back converter switching regulated power supply is not only consisting of a transistor. Two transistors also can make up single-ended converter type switching regulated power supply. The basic difference between single-ended fly-back switching regulated power supply and push pull, full bridge, half bridge two ends converter switching regulated power supply is the magnetic core of high frequency transformer only works on one side of magnetic hysteresis loop (first quadrant). Typical single-ended fly-back converter switching regulated power supply principle diagram is shown in the diagram. So called single end is the magnetic core of converting circuit is only working on one side of its magnetic hystersis loop. So called fly back is storage energy at primary winding when transistor is breaking over and the storage energy releasing to load by secondary coil when transistor is cutting off. When switching tube VT1 is breaking over by encouraging of controlled pulse, input voltage Ui will add to primary winding N1 of high frequency transformer. Vice-side winding N2 has not current because rectifier diode VD of transformer T1's vice-side winding is reverse connecting.



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