| ??? 09/21/09 14:50 Read: times |
#169015 - Detecting AC voltage..... |
I am fishing around for ideas on how to easily make an AC voltage detector that works from 85VAC to 260VAC at 50 or 60Hz. I do not want to use the conventional 18K 4Watt resistor and 4N35 opto coupler due to the heat build up. I am OK with an opto coupler for isolation but not dropping a huge voltage in current limit resistors. Anyone have some clever ideas that do not use transformers?
The application for this is an embedded gadget that has power line switching control via the use of SSRs (solid state relays) and I want to add a feature for the MCU to be able to detect if the SSR output is switching correctly or not. The SSR could fail open or shorted OR the series circuit breaker could trip and I want to let the user know about it. Since there are multiple SSRs in the product I need something small, low cost and able to operate relatively cool (i.e. without any forced air cooling). Michael Karas |
| 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 |