Solar buck converter

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Senior Member

Joined: 17/10/2017
Location: Belgium
Posts: 258
Posted: 02:38pm 17 Nov 2020      

  Warpspeed said  
  nickskethisniks said   It's now 1,8mH but the airgap needs to be adjusted for higher saturation point and the right inductance.

The rule of thumb way of arriving at an optimum gap is to monitor the ripple current at full load.  
If the gap is way too large, you lose too much inductance, and ripple current will be high.
If the gap is too small, it will saturate, and again ripple current will be high.

Optimum gap will produce a definite minimum of ripple current, which you can find experimentally fairly easily.  
That will produce the highest dynamic inductance under the exact conditions under which it operates in the real world.
Theory can only steer you in the right direction, the real proof is in the final testing.

In the mean time I've learned more about inductors. So I think I will make new ones with iron powder cores, I plan to stack 2pcs T200-26d per converter. Allthough the ones in the picture will work perfectly on short term.