April 2011
Intermediate to advanced
400 pages
16h 50m
English
Content preview from Power Sources and Supplies: World Class Designs
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Chapter 6
frequency. An RC snubber can also be used to slow both the rise and fall, as shown in
Circuit B.
This circuit will dissipate energy on both edges of the switching waveform.
Circuit C shows a rate of rise snubber that limits the rate of voltage rise at the switch
during turn-off. Circuit C is used to keep the voltage at the drain or collector of the switch
low so that the power during the transition is kept low. The capacitor must be charged
and discharged each cycle for proper operation. This requires a fairly low value for the
resistor. A good rule of thumb is to set the RC time constant to 10% of the cycle time. ...
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