The above waveforms show the sudden transitions and reversal currents of the primary and secondary winding of the flyback transformer. The performance characteristics of the flyback converter topology are shown below. The flyback converter topology is adaptable, flexible, simple mostly used SMPS (switch mode power supply) design with good performance characteristics that gives an advantage to many applications. The total energy in the core will be transferred to the load will be rectified and the process would be continued till the energy in the core is depleted or until the switch is turned ON. When the switch is in the OFF position, the energy is transferred to the load by changing the polarity of the transformer windings due to the magnetic field and the rectifier circuit starts rectifying the voltage. Then the diode becomes reverse biased and no current flows to the secondary winding of the transformer and the total energy are stored in the capacitor used at the output.
The energy is stored in the form of the magnetic inductance of the transformer and the current increases with time linearly. Here drain voltage Vd = 0 and the current Ip passes through the primary winding. The total energy will be stored in the primary winding of the circuit. When the switch is in the ON position, there is no energy transfer between the input and the load. The working principle is based on the switch mode power supply (SMPS) mode. The operation of the flyback converter can be understood from the above diagram. Ton = switch ON time Operation of Flyback Converter/Working Principle Where Vsec = voltage in the secondary winding = total output voltage at the load The total energy transferred is expressed as The diode voltage drop will be zero at an ideal condition Ton = period when the switch is turned ON Lp = inductance of the primary winding or primary inductance. The total energy stored in the primary winding is, At ideal condition, Vs = 0 ( voltage drop)īy applying integration on both sides we get,
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