Single-ended flyback converter switching power supply circuit diagram

Published:2011/3/24 0:40:00 Author:Nicole | Keyword: converter, switching power supply | From:SeekIC

Single-ended flyback power converter switching power supply is not composed only by a transistor, the single-ended converter switching power supply also can be made of two transistors. The fundamental difference between Single-ended flyback switching power supply and the push-pull, full bridge, half-double-ended converter switching power supply is that the core of high-frequency transformer only work on one side of its hysteresis loop. The schematic of atypical single-ended flyback converter switching power supply as shown. The so-called single-ended, that means the core of converting circuit only work on one side of its hysteresis loop. The so-called flyback, that means when the transistor turns on, the energy stored in the primary induction coil, when the transistor is off, the energy stored in the primary coil will release to the load through the secondary coil. When the switching tube VT1 was motivated to turn on, the input voltage Ui will be applied to the primary winding N1 of high-frequency transformer T1. Due to the secondary rectifier diodes VD of transformer T1 was reversed, so there is no current flow on the secondary winding N2. When VT1 end, the voltage of winding N2 was polarity reversed, VD was positively skewed, the energy during VTl turns on stored in T1 will released through VD load.



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