flyback transformer design tool
DESCRIPTION
Fly Back Transformer design Tool:Derivation of the flyback converterThe flyback converter is based on the buck-boost converter. Its derivation is illustrated inFig. 1. Figure 1(a) depicts the basic buck-boost converter, with the switch realized using aMOSFET and diode. In Fig. 1(b), the inductor winding is constructed using two wires,with a 1:1 turns ratio. The basic function of the inductor is unchanged, and the parallelwindings are equivalent to a single winding constructed of larger wire. In Fig. 1(c), theconnections between the two windings are broken. One winding is used while thetransistor Q1 conducts, while the other winding is used when diode D1 conducts. The totalcurrent in the two windings is unchanged from the circuit of Fig. 1(b);TRANSCRIPT
Sheet1FLYBACK XFMR DESIGNRev0.1DATA INPUTRESULTSPeak output power (Wpk)10Peak pri current =0.4166666667Min dc input voltage (on Cbulk)120Primary rms current =0.19543399Efficiency estimate (dec. #)0.8Primary L (uH) =3200Switching freq (kHz)45Primary turns =222.2222222222(set to 45 kHz for QR design)Min secondary turns =11.4478114478Core area (Ae in sq cm)0.2Max core flux (kilogauss)3Approx core gap-inches =0.0185185185Output voltage12Duty Cycle max.0.66(set to 0.6 for QR design)= Enter Data= Calculated Data