Single-ended flyback switching power supply transformer design program Single-ended flyback switching power supply transformer design program only needs to input conditional project parameters, inductance and number of turns can be automatically calculated, and then adjusted based on the calculated parameters as a reference. Condition items: Value unit Value unit Input AC voltage minimum 165.0 V Duty cycle Input AC voltage maximum 235.0 V Krp value 0.6 Operating frequency 50000.0 HZ Efficiency 0.8 Primary reflected voltage 135.0 V Bm 0.2 T Output DC voltage 1 24.0 V Load current 1 2.0 A Output DC voltage 2 24.0 V Load current 2 2.0 A Output DC voltage 3 24.0 V Load current 3 0.1 A Output DC voltage 4 5.0 V Load current 4 0.5 A Feedback voltage 16.0 V Load current 5 A Output DC power 100.9 W Current density 400.0 A/cm2 Window utilization coefficient Ku 0.4 I. Calculate the minimum input DC voltage and maximum input DC voltage according to the AC input voltage Voltage value unit Emin: 222.8 VEmax 329.0 V2. Determine the maximum duty cycle at low grid voltage (omit if known) Dmax = Vor 0.388209921Vor+(Vmin-Vds) 3. Calculate input power and apparent power Pin= 126.125 w Pt= 227.0 w 4. Calculate transformer core parameters AP == Aw*Ac== Pt*Dmax*104 0.550833483 cm4 F*Bm*J*Ku*KiKu: Window utilization factor Select core parameters: Model Ae(cm2) Aw(cm2) AP(cm4) PQ32/20 0.843 1.29 1.087 5. Calculate the primary current peak and effective value: Ip = 2Pin 2.08362134 ……
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