April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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189Transformer-isolated Circuits
vary depending on the 48 V input voltage while the fi
lter choke is charging with current.
However, when the fi lter choke is discharging, the diodes clamp the voltage across the
choke to approximately the output voltage. Since the output voltage is highly regulated,
we get a well regulated auxiliary supply for the control IC. This would seem to be the
best possible source for IC power. The problem, especially for off-line supplies, is that
the safety isolation between the windings of the fi lter inductor must be the same as
the safety isolation of the main transformer. The supply voltage of our ...
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