| Electronics > Projects, Designs, and Technical Stuff |
| Under-rated fuse question |
| << < (5/6) > >> |
| OM222O:
have you thought about making an electronic fuse? you can use a triac (solid state relay) which is controlled by a microcontroller. should cost you less than 5$. |
| johnkenyon:
--- Quote from: Neomys Sapiens on April 03, 2019, 09:07:08 pm ---I would not recommend to make it a self-resetting one, as some are suggesting. If overheating happens (by your description), there was a violation of the control signal, which should be investigated/corrected! The other possibility is to rebuild the device in such way, that it can tolerate being switched on continuously without overheating. --- End quote --- I second this - the intention is for the device to fail safe and remain failed until fixed. Having something auto reset will inevitably result in something else getting cooked and failing in a more destructive manner... |
| Jester:
--- Quote from: johnkenyon on April 04, 2019, 09:38:55 am --- --- Quote from: Neomys Sapiens on April 03, 2019, 09:07:08 pm ---I would not recommend to make it a self-resetting one, as some are suggesting. If overheating happens (by your description), there was a violation of the control signal, which should be investigated/corrected! The other possibility is to rebuild the device in such way, that it can tolerate being switched on continuously without overheating. --- End quote --- I second this - the intention is for the device to fail safe and remain failed until fixed. Having something auto reset will inevitably result in something else getting cooked and failing in a more destructive manner... --- End quote --- I agree, I used this one: https://www.digikey.com/product-detail/en/cantherm/SDF-DF100S/317-1129-ND/1014758 |
| Jester:
--- Quote from: OM222O on April 03, 2019, 09:21:12 pm ---have you thought about making an electronic fuse? you can use a triac (solid state relay) which is controlled by a microcontroller. should cost you less than 5$. --- End quote --- Not enough space, and total BOM cost is about$10, so $5 is significant. |
| Siwastaja:
Also, protecting against MCU software malfunction by another MCU, possibly written by the same person, is less robust than using the proper temperature cutout device, which Does The Right Job very reliably, when chosen properly. Use the time saved by not implementing a separate e-fuse device to review the actual controller a few times more; then slap in the proper thermal fuse (single-use, non-resettable, to get failed products back for your review for root cause analysis) as a safeguard. This is also the cheapest proper solution. Even if precision, low unit variation fuses existed, they wouldn't protect when the input voltage (and hence resistor current) is lower than expected. |
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