| ??? 09/22/09 08:35 Read: times |
#169038 - Capacitive Dropper Responding to: ???'s previous message |
A well known company, probably the largest manufacturer of PLC's in the world uses capacitive couplers for their ac input detection modules. I have seen cases where they are run 24/7 in extreme industrial settings.
I personally have never seen one fail. Once out of curiousity I looked at the circuit. Not much, 4 low watt SMD resistors, 1 1 watt resistor, A .33uf line rated capacitor that drops the voltage, A 1.0 uf film or ceramic cap that I believe filters spikes and a Sharp PC 844 optocoupler that does the isolation. Sometimes it's helps to get ideas from the way "experts" in the industry that have a reputation for reliable equipment do it. Let me know if you need more information. Bruce |
| Topic | Author | Date |
| Detecting AC voltage..... | 01/01/70 00:00 | |
| Thoughts... | 01/01/70 00:00 | |
| ring-detector? | 01/01/70 00:00 | |
| The voltage range appears to be in the same ball-park | 01/01/70 00:00 | |
| In old systems ... some of which are still in use ... | 01/01/70 00:00 | |
| Don't use a relay | 01/01/70 00:00 | |
| I was thinking optocoupled triac driver ... | 01/01/70 00:00 | |
| Capacitor or Relay | 01/01/70 00:00 | |
| Capacitive dropper | 01/01/70 00:00 | |
| I used it for a long time in traffic lights controllers | 01/01/70 00:00 | |
| Capacitive Dropper | 01/01/70 00:00 | |
| Ideas Appreciated | 01/01/70 00:00 | |
| Strobed measurement to minimize heat dissipation | 01/01/70 00:00 | |
Clever Concept | 01/01/70 00:00 |