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Author Topic: What kind of fuse is this?  (Read 3458 times)

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Offline DaGlitchTopic starter

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What kind of fuse is this?
« on: September 12, 2014, 07:54:44 pm »
Was just looking through a schematic and saw this fuse symbol that I've never seen before. Anyone have an idea of what this is?
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Offline ElektroQuark

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Re: What kind of fuse is this?
« Reply #1 on: September 12, 2014, 07:57:43 pm »
It looks like that when the fuse dies an output is enable.
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Offline DaGlitchTopic starter

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Re: What kind of fuse is this?
« Reply #2 on: September 12, 2014, 08:20:40 pm »
Yea the bottom output as shown goes to a fail-safe protection input pin. I have just never seen that symbol used before and was wondering if there was a fuse that actually had 3 pins like that. I was thinking they just combined some things into one symbol, but couldn't find any reference making me think that.
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Offline bktemp

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Re: What kind of fuse is this?
« Reply #3 on: September 12, 2014, 08:27:36 pm »
Those fuses are often used as battery protectors for lithium batteries: When the circuit detects an overvoltage from the charger it pulls the centre pin to ground until the fuse blows and disconnects the connection to the battery.
Here is a datasheet for such a device:
http://battery.newlist.ru/images2/Fuse.pdf
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Offline zapta

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Re: What kind of fuse is this?
« Reply #4 on: September 12, 2014, 08:34:27 pm »
It's called a chemical fuse. You can force it to burn with a signal. Hard to find. You may find the in notebook battery packs and others.
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Offline DaGlitchTopic starter

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Re: What kind of fuse is this?
« Reply #5 on: September 12, 2014, 08:35:49 pm »
That would be the answer to my question. Thank you very much guys!
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Offline DaGlitchTopic starter

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Re: What kind of fuse is this?
« Reply #6 on: September 12, 2014, 09:27:33 pm »
Been thinking of an alternative way to achieve a similar effect, since those are pretty hard to find parts. Ideas?
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Offline zapta

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Re: What kind of fuse is this?
« Reply #7 on: September 12, 2014, 09:40:55 pm »
Quote from: DaGlitch on September 12, 2014, 09:27:33 pm
Been thinking of an alternative way to achieve a similar effect, since those are pretty hard to find parts. Ideas?

One way is to actually cause high current through the fuse, for example by triggering a transistor or an SCR, assuming your power source has sufficient current capability.  Another is to write a bit in nonvoletaile memory that will cause a series transistor never to turn on again.

Do you plan to use it for a battery pack?  Look at the bq20z45-R1 datasheet for example. It has three levels of protection, two series transistors and one chemical fuse (triggered by the SAFE signal).
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Offline Alex Eisenhut

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Re: What kind of fuse is this?
« Reply #8 on: September 12, 2014, 10:03:41 pm »
Quote from: DaGlitch on September 12, 2014, 09:27:33 pm
Been thinking of an alternative way to achieve a similar effect, since those are pretty hard to find parts. Ideas?

http://www.sii-ic.com/en/semicon/products/power-management-ic/lithium-ion-battery-protection-ic/
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Offline DaGlitchTopic starter

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Re: What kind of fuse is this?
« Reply #9 on: September 12, 2014, 10:22:36 pm »
Yea it will be used in a battery pack.  Appreciate the feedback. Just thinking of design alternatives
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Offline PChi

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Re: What kind of fuse is this?
« Reply #10 on: September 13, 2014, 12:06:49 pm »
The closest to that symbol that I have seen are thermal fuses with integral resistors.
http://www.atcsemitec.co.uk/pdfdocs/d6x-thermal-fuses.pdf


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