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Old 31st July 2004, 01:18 PM   #11
G is offline G  United States
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Quote:
Originally posted by cliffhiker
As long as the primary will sustain the voltage... here's a great way to bleed it quickly that I've used on low voltage supplies

http://www.reed-electronics.com/ednm...es/70501di.pdf

or

http://www.reed-electronics.com/ednm...bestofdi_power

A profoundly clever, yet simple, idea! Thank you.
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Old 1st August 2004, 08:12 AM   #12
jueic is offline jueic  Taiwan
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Quote:
Originally posted by Eli Duttman
Gavin,

The purpose of bleeder resistors in PSUs employing cap. I/P filters is to discharge the caps. when the unit is powered down.

Other than dischaging the caps, the bleeder resistors main purpose should be providing the minimum load current for chokes.

Minimum Current= 2*1.414*Vin /6Pi *pi *f *L

Choke can not operate correctly if the current falls below the min value.
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Old 4th August 2004, 12:17 AM   #13
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You are entirely correct,

However, nothing precludes using both approaches when appropriate.

Allows selection of minimum bleed resistor to maintain minimum load current for the choke (when a choke is used),

and

A lower resistance to safely and quickly discharge upon turn off.
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Old 4th August 2004, 09:26 AM   #14
morfeas is offline morfeas  Greece
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Contacting a small value bleed resistor on power off gave a big thumb on my power amp.

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