Power Point Tracking Controllers [RE-wrenches]

[Rob Wills]

Hi Marco.
We have had quite a lot of experience with buck type controllers for PV MPPT
and fuel cell power conversion.  There are several areas where buck
converter designers can get in to trouble - the circuit looks simple, but
there are quite a few traps.

The main ones are voltage stress on the input switch (FET) and free-wheel
diode.
We use a 160V part in our MM front end, and have had few problems with PV
open circuit up to 120V dc.  We also have pretty heavy duty surge
suppression on the input.

It is tempting to use lower voltage rated parts as the ON resistance is much
lower, but the converter then is more fragile..

Best Regards

Rob Wills

-----Original Message-----
From: Mangelsdorf, Marco [mailto:mmangelsdorf at hei.com]
Sent: Friday, June 14, 2002 2:58 PM
To: RE-wrenches at topica.com
Subject: RE: Power Point Tracking Controllers [RE-wrenches]


Jeff,

What caused these MPPT controllers to fry?

marco


I just replaced 4 "fried" almost new MPPT controllers with C-40's on same
four
arrays and battery banks and have had no more problems. 

Jeff Yago
Dunimis Technology Inc.

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