BASIC_FORWARD_CONVERTER_CIRCUIT

Published:2009/7/16 22:38:00 Author:Jessie | From:SeekIC

The figure is a simplified schematic for a transformer-coupled forward converter. Based on the buck converter, it is similar to the flyback converter. Inductor L1, rather than transformer T1, stores the energy. When switching transistor Q1 turns on, current builds in the primary winding of trans-former T1, storing energy. Because the secondary winding has the same polarity as the primary winding, energy is transferred forward to the output. Energy is also stored in inductor L2 through forward-biased diode D2. At this time, flywheel diode D3 is back-biased. When Q1 turns off, the transformer winding voltage reverses, back-biasing diode D2. Diode D3 becomes forward-biased, causing current to flow through RL and delivering energy to the load through inductor L1. The third winding and diode Dl return transformer T1's magnetic energy to the dc input when Q1 is off.



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