/diy/ - Do It Yourself

Anonymous Thu Nov 16 14:35:25 2017 No.1279480 [View]
File: 5 KB, 535x175, CT-12V.png [View same] [iqdb] [saucenao] [google]

>>1279146
I would keep is simple and robust.

The fancy switching action only shifts the problems to the output section and will need a lot of experimentation because of the poorly defined Vth (tolerances) of the MOSFETs.

A 30V shunt regulator is as simple as a 30V to 12V step-down converter. At the low end (0.25A) the shunt regulator barely loads the CT at all and at the high end (2.5A) it has to dissipate about 75W which is no problem for a few 3055s on a heat sink with some simple circuitry around.

The choice of 30V is just a quick guess from the power balance with 0,55A out from 0.25A in. In practice you will adjust this voltage according to the efficiency of the step-down converter. For 88% it would be 30V/75W and for 75% it would be 35V/88W max shunt power, but only at (and during) 1kA.

The optional crow bar serves as life insurance...

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/diy/ - Do It Yourself

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