April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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185Transformer-isolated Circuits
The effective switching frequency is double the oscillator frequency. Each switch
pro
vides the equivalent of a single switch forward converter. The bipolar drive doubles
the effective duty cycle and the operating frequency of the output fi lter is double the
switching frequency.
The control IC must provide two-phase output pulses to alternately drive the switches.
Additionally, the circuit will behave badly if both switches conduct at the same time. The
transformer will allow very large switch currents to fl ow if both switches conduct at the
same time. A push-pull control IC must provide the ...
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