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Safe PC power supply loading PDF Print E-mail

PC power supplies are often ideal for other purposes but the required loads represent wasted power. So, it would be nice to be able to eliminate them. Unfortunately, it probably isn't easy to modify a PC power supply so less/no load is needed for regulation. However, it is worth testing a supply to see how low you can actually go on the loads - many WILL regulate the +5 with no load on the +12 but probably not the reverse. While 20 percent load is often recommended, 5 percent or less may work just fine. And, some don't need any additional loads on either output (they will probably include a minimal load resistor internally).

CAUTION: Usually, a PC power supply will just shut down with too little load. However, some may be much more unhappy. Thus attempting to determine a safe minimum load does entail some risk of letting the smoke out.

The reason that you need a load is that the PWM controller can't do down to really small duty cycles needed for low loading. The design would need to be changed and differs from unit to unit.

 
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