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Single-end forward converter circuit with RC and diode clamp

2016-08-02 22:04  
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Single-ended forward converter has with removing magnetic winding and diode clamping circuit. Above which we talked about is the one with removing magnetic winding. The diagram shows single-end forward converter circuit with RC and diode clamping circuit. After VTl is cut off, winding N1 and VD3, R, C constitute a single-ended fly-back converter, the magnetizing current IM is attenuated by VD3, the reverse polarity voltage of N1 is superimposed on the input voltage U1 and applied between the emitters of VTl, that is Uce1 = Ui + Uc. Obviously, when U1 is greater than Uc, the cut-off time, toff will be less than on-time ton, that is the biggest turn-on pulse width can exceed half of the period. The conduction pulse width allows more, which can get a larger power output. The downside is that VTl will bear higher voltage, excitation energy will be consumed in resistor R.