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In a forward converter, a tertiary winding is used. What is the reason?

In a forward converter, a tertiary winding is used. What is the reason? Correct Answer To demagnetize the core before the application of the next switching pulse

Forward converter:

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  • Forward converter is a switched mode power supply (SMPS) circuit that is used for producing isolated and controlled dc voltage from the unregulated dc input supply.
  • It consists of a fast switching device ‘S’ along with its control circuitry, a transformer with its primary winding connected in series with switch ‘S’ to the input supply and a rectification and filtering circuit for the transformer secondary winding.
  • The load is connected across the rectified output of the transformer secondary.
  • The transformer used in the forward converter is desired to be an ideal transformer with no leakage fluxes, zero magnetizing current and no losses.
  • Due to the presence of finite magnetizing current in a practical transformer, a tertiary winding needs to be introduced in the transformer and the circuit topology changes slightly.
  • Tertiary winding is used to demagnetize the core before the application of the next switching pulse.

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