[Amps] transformer talk

[KD7QAE]

For the major types of filters the secondary RMS current is related to 
the DC load current as:

Inductor input: 0.7
FWCT capacitor input: 1.0 to 1.2
FWB capacitor input: 1.6 to 1.8

Data from O.H. Schrade: "Analysis of Rectifier Operation"

Tomm

Steve Thompson wrote:

>TexasRF at aol.com wrote:
>  
>
>> 
>>I don't have the answer Bill but there is this to consider:
>> 
>>In the capacitor filter, current only flows about 20% of the cycle. This is  
>>very much not a sine wave and I wonder how rms even applies in this case. 
>>There  has to be some terrific harmonics in that waveform!
>>    
>>
>rms applies to any waveform - if the voltage/current are sinusoidal, 
>then the 1.414 or .7071 factors apply. Where the waveform is a series of 
>short peaks, then there isn't a simple numerical factor to use - the rms 
>value has to be calculated by looking at data points over a time period, 
>or measured using something that does the equivalent electronically.
>
>Your example of 5x the current for 1/5th the time leading to 5x the heat 
>is a much better way of getting the point across!
>
>Steve
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