| ??? 11/08/06 15:05 Read: times |
#127568 - Crowbar SCR, trip time of fuse... Responding to: ???'s previous message |
Ap said:
Can we use mosfet to trip load instead of using a crowbar? The idea of using a crowbar SCR is, that it works like a latch, means stays activated even when the overvoltage is removed again. When intending to disconnect the circuit from overvoltage by the help of MOSFET, then you will need an additional latch to store the fault status, otherwise the MOSFET will oscillate and switch-on and -off all the time. Crowbars are difficult to design, because when using the crowbar SCR in combination with a fuse, then you have to take into calculation the trip time of fuse. I have seen applications, where the supply was too weak to make the fuse to trip. You could see the fuse acting like a lamp, not tripping even after hours... Kai |
| Topic | Author | Date |
| Absolute maximum Rating .. | 01/01/70 00:00 | |
| It doesnt really work like that | 01/01/70 00:00 | |
| It can withstand it for exactly 347msec! | 01/01/70 00:00 | |
| It can withstand it for exactly 347msec! | 01/01/70 00:00 | |
| More details needed about your crowbar circuit! | 01/01/70 00:00 | |
| More details needed ......... | 01/01/70 00:00 | |
| Crowbar SCR, trip time of fuse... | 01/01/70 00:00 | |
| a fun story | 01/01/70 00:00 | |
| Yes | 01/01/70 00:00 | |
| oscillate and switch-on and -off | 01/01/70 00:00 | |
| It is protection | 01/01/70 00:00 | |
if overvoltage crowbars | 01/01/70 00:00 | |
| Part Damage from high voltage | 01/01/70 00:00 | |
| what is all this about a crowbar | 01/01/70 00:00 | |
| What is all this about switchers, Erik? | 01/01/70 00:00 | |
| it is that as | 01/01/70 00:00 | |
| stay away from building switchers | 01/01/70 00:00 | |
| no, switch mode power supplies | 01/01/70 00:00 | |
| Yes and no | 01/01/70 00:00 | |
| It heavily depends | 01/01/70 00:00 | |
| POWER SUPLIES | 01/01/70 00:00 | |
| Plinio Babo, why no (protected) e-mail in your pr | 01/01/70 00:00 |