Author Topic: Buck boost converter blowing fuses  (Read 932 times)

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Offline Dunk_cTopic starter

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Buck boost converter blowing fuses
« on: October 04, 2019, 07:18:24 am »
Hi

I have a small cheap regulated buck-boost DC converter that sits between my 12v solar system and a portable lithium ion battery bank.  The device is used to convert the variable battery voltage to a constant 15V required by the lithium battery bank for charging.

The B-B converter is portable for use in a vehicle so operates of a cigarette plug with fuse.  Nearly every time I disconnect the battery bank the fuse blows presumably as the inductor coil fields collapse.  This might be a big problem when used in the car.  I don’t know if the battery is also experiencing a current surge but that would probably be bad!  What is the fix for this?  Can I stop it by inserting a couple of power diodes in series with the positive input and output lines?

Cheers
 

Offline AVGresponding

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Re: Buck boost converter blowing fuses
« Reply #1 on: October 04, 2019, 05:29:18 pm »
It would help to know more, such as the fuse rating, battery pack details, solar PV details...
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Offline Zero999

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Re: Buck boost converter blowing fuses
« Reply #2 on: October 04, 2019, 07:26:07 pm »
A simple schematic would also help.

It does seem odd it's blowing the fuse when the battery is disconnected.

And what's a B-B converter? Don't you mean a DC:DC converter? EDIT: Duh, Buck Boost converter. :palm:
« Last Edit: October 07, 2019, 08:57:24 am by Zero999 »
 


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