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Subject: Re: PSU's: Exceeding transformer rated current
Date: Wed, 8 Jan 2003 01:33:48 -0000
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"John Woodgate" wrote in message
> You have a direct current in the secondary winding, which is the average
> load current. This greatly increases the losses in the core, resulting
> in the transformer heating up much more that you would expect from the
> fact that the secondary current appears to be flowing for only half the
You are saying that a transformer rated at 1A rms current when supplying power during
both halves of the cycle cannot supply 1A rms if supplying power for only half the
In both cases I^2 losses (I think) would at least be the same. But the peak
currents would be different, In first case, the peak current is 1.414A, I'm not
really sure what the peak current would have to be for 1A rms in the second case.
Mind gone blank. Bedtime for me. Rich.
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