In a typical application, a switching device such as a transistor is turned on and off usually by a pulse-width-modulated signal. Operation of a PWM flyback converter in continuous modeįigure 1 Basic circuit of a flyback converter – Image Credit In a practical circuit, a feedback circuit is used to monitor the output voltage and while a control circuit switching device. A diode in the secondary rectifies the voltage while the capacitor smoothes the rectified voltage.
A switching device chops the input DC voltage and the energy in the primary is transferred to the secondary through the switching transformer. The basic flyback converter uses a relatively small number of components. This arrangement has the interesting property of transferring energy to the secondary side of the power supply only when the primary switch is off. This only requires one winding on the inductor, so the inductor would be called a flyback transformer. If a diode is in place to conduct the stored energy somewhere useful, the diode is called a flyback diode. When the current flowing through an inductor is cut off, the energy stored in the magnetic field is released by a sudden reversal of the terminal voltage. Principle of operating of a flyback converter In the flyback configuration, the primary and secondary windings are utilized as two separate inductors. However, the primary winding of the transformer replaces inductor while the secondary provides the output. The flyback converters are similar to the booster converters in architecture and performance. The flyback converter is a power supply topology that uses mutually coupled inductor, to store energy when current passes through and releasing the energy when the power is removed.
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