| ??? 11/06/06 13:32 Read: times |
#127429 - what is all this about a crowbar Responding to: ???'s previous message |
A properly designed crowbar does not allow any voltage above the max for any time (OK, naybe a few nanoseconds, but the inductance.capacitance takes care of that)
I keep saying "I know no engineer that can not design a switching power supply, outside the PS makers I know nonw that can make one work" Our (in)famous in-house designed switcher has cost about 100 times the "savings" in repairs of the supply and what it burned. After replacing it with a PT (Power Trends) module costing less than $10 NO, NONE, NADA problems have been related to the switcher. Also, we now find out that with the in-house designed switcher we can not meet EMI requirements, with the PT module we are well within limits. The engineer that made the in-house designed switcher did not have any lack of qualifications and spent about 6 months "getting it right" not to mention the 4 upgrades that came later. Out of curiousity I investigated the in-house made switcher and there are NO 'errors'. It perfectly matches the chip manufacturers specs and an engineer from NS (the chip supplier) could see no problem. Nothing personal, but in my opinion, with the rock bottom prices of switcher modules and the problems in getting an in-house right without years of "know-how" anyone that try to save $1 by making his own switcher is downright stupid. Erik |
| 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 |