Author Topic: Fuse for battery protection  (Read 1227 times)

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Offline MoondeckTopic starter

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Fuse for battery protection
« on: March 07, 2017, 07:22:33 pm »
So, i am doing a project at school that requires battery protection, i am going to use this chip http://www.ti.com/lit/ds/symlink/bq2946.pdf
The schematic shows some sort of a fuse with resistors in it. I understand what it does, but i have been unable to find a fuse that would do this and have this 3 pinned setup. Could i use a normal fuse and the MOSFET would just short it? Could anyone give me link to one please (preferably at Farnell)?

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Offline ConKbot

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Re: Fuse for battery protection
« Reply #1 on: March 07, 2017, 09:07:41 pm »
It's a "chemical fuse"  a fuse with a third terminal to trip it. It doesn't require as much current on the 3rd terminal, making it easier to trip. They are a big pain to find, like surprisingly so. You can use a chunky mosfet that can handle enough current to trip your fuse in the appropriate time frame, or you can use a thermal fuse (70-80c should be fine),  and park a resistor next to it, so the resistor trips the thermal fuse.
 


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