[Amps] transformer talk

[KD7QAE]

These are the ranges of the value Irms under most conditions of winding 
and capacitor and wiring leakage inductance and series resistance as 
developed by theory.  For a design point I would suggest using Irms = 
2Idc.  Steve is correct.

Tomm

Steve Thompson wrote:

>KD7QAE wrote:
>  
>
>>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"
>>    
>>
>I agree these are the ranges of figures that 'drop out' most often - but 
>I'd caution against automatically assuming that they cover every 
>instance. In the last case, if you have 1.9 instead of an assumed 1.7, 
>there's 25% more heat.
>
>In the absence of using PSU Designer or somesuch to predict values, 
>0.7xIdc for choke input and 1.7xIdc for capacitor input are also useful 
>estimates of the rms ripple current in the smoothing caps.
>
>Steve
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>  
>