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Old 23rd January 2004, 07:37 PM   #1
bellx is offline bellx  South Africa
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Default Push Pull

Why is the push pull topology not used in offline smps? I see mostly half bridge , full bridge and flyback. Can somebody explain ?
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Old 24th January 2004, 02:29 PM   #2
bellx is offline bellx  South Africa
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Default Nobody?

Surely somebody can answer?
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Old 25th January 2004, 02:21 AM   #3
subwo1 is offline subwo1  United States
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One big reason is that it does not work well with ungapped transformers because of the tendency to apply magnetic offset to the trasformer core. Since the half bridge drives the transformer through a capacitor, any DC component in the pwm waveform is blocked.
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Old 25th January 2004, 10:59 AM   #4
djk is offline djk
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Push-pull also requires double the voltage ratings on the switch transistors.

For off line 240V the high voltage FETs have too much loss due to RDS.

IGBTs may be used with less loss, but they are not quite as fast.
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