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Capacitive voltage divider type clamping single-ended flybac

2016-08-14 15:08  
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Capacitive voltage divider type clamping single-ended flyback type switching power supply
The capacitive voltage divider type clamping single-ended flyback type switching power supply is as shown in the figure. When the VT1 is in the conduction state, the capacitance C02 charges, the COl discharges, the circuit adds the 1/2 input voltage to the original edge winding N1l of the transformer T1; when the VTl is in the cut-off state, the voltage polarity of Nll reverses, when the collector-emitter voltage Ucel of VT1 reaches the input voltage Vi, the diode VD4 conducts, the Ucel is clamped; similarly, when the VT2 is in the conduction state, the C02 discharges, the C0l charges, the circuit adds the 1/2 input voltage to the original edge winding N2l of the transformer T2; when the VT2 is in the cut-off state, the voltage polarity of N2l reverses, after the VD3 is conducted, the Uce2 is clamped by the input voltage Vi.