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Basics
In order for the transformer Tr to be available for the maximum energy flow after re-closing
the power switch S1, the remaining magnetic energy in the transformer Tr must be dis-
charged when the power switch S1 is open.
Because of the reversing diode D1 the secondary circuit is not available. This requires an
additional winding N1' in the primary circuit. The winding discharges the magnetic energy.
The winding N1' consumes the magnetic energy and leads it back to capacitance C1
across diode D2 in the form of electrical energy. This energy is then again available for
transmission into the output circuit when closing switch S1.
Both primary windings N1 and N1' often have the same number of turns but an opposite
winding sense. Therefore, the time required for energy storage and energy discharge is the
same. Power switch S1 must be opened for the same time as it was closed before.
The reverse voltage U rev is the sum of the inverse transformation voltage U 1 and the input
voltage U in . It is present at the opened power switch S1. The reverse voltage of
conventional forward converters is lower than the reverse voltage of flyback converters
with one power switch. For a long time, this was the reason for only designing forward
converters for this performance range.
5598_en_03
PHOENIX CONTACT
2-21
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