| ??? 07/11/04 10:13 Read: times |
#73976 - RE: Triac, IGBT, SPM, Relay? (a bit OT) Responding to: ???'s previous message |
Bartosz Wucke wrote:
------------------------------- A solid state relay appeared to be a failure - it can drive some very low power devices, but your average TV set would be too much for it. SSRs come in big sizes - I have switched a 10kW load with one. So I checked - Okay, triacs are simple and neat, but they can't provide enough power....... in fine print I saw a note "This construction may be illegal in some countries, especially in Europe"... I think you are getting bad information again. Triacs will switch kilowatts easily. They DON'T like commutating inductive loads, bu, then neither do triacs. unless you use proper drive control and determine when the current through the device is zero. A better method for REALLY big loads uses two thyristors back to back, so one device has half a cycle torecover while the other device is conducting. That is still not enough though often with a transformer load for example - I had a hell of problem commutating a 8kVA transformer recently. Phase control is NOT "illegal in Europe" - but RFemissions on the supply line or into the ether beyond carefully laid down limits IS. So you design it properly.... |
| Topic | Author | Date |
| Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| RE: Triac, IGBT, SPM, Relay? (a bit OT) | 01/01/70 00:00 | |
| 8mm isolation path length is needed! | 01/01/70 00:00 | |
| What is the required aim? | 01/01/70 00:00 | |
RE: What is the required aim? | 01/01/70 00:00 | |
| The Right vs The Legal. | 01/01/70 00:00 |