Timeline for Isolation (or not) in energy monitoring
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 19, 2017 at 5:21 | comment | added | Tyler Brooks | You have to use every trick in the book. For instance, put a TVS (transient voltage suppressor) from your power rail to your ground. This protects the circuit from voltage spikes but it also protects against 'ground bounce' which will momentarily send your ground potential above your power rail (this can really cause problems that are hard to find). Any lines that touch the power (like your power monitoring lines) should have some form of TVS protection. Also, use ferrite beads on sensitive lines like your reset line. Otherwise, you will get random resets that you can't explain. | |
| Nov 19, 2017 at 1:58 | comment | added | SoreDakeNoKoto | @TylerBrooks And the dangers to the circuit of making such 'hot' connections? Is the whole 'starred GND plane' + inductor between AGND and DGND, usually enough to protect the MCU from dangerous mains transients? | |
| Nov 17, 2017 at 18:22 | comment | added | Tyler Brooks | Hot designs have no magnetic field between the mains and the circuit. By design they are not isolated. They are used in situations where cost and size are a concern. To get isolation, throw in a power supply design that 'transforms' the mains current 'loop' into your own current 'loop' local to the circuit. | |
| Nov 17, 2017 at 17:40 | comment | added | SoreDakeNoKoto | Is there no practical way to isolate the mains neutral (or live!) from AGND/DGND? | |
| Nov 17, 2017 at 6:21 | comment | added | jsotola | or put an isolation transformer between the scope and the mains, but be very aware that you have a "hot" scope when you connect it to the device (or use a battery powered scope, still "hot" though) | |
| Nov 17, 2017 at 2:07 | review | First posts | |||
| Nov 17, 2017 at 3:31 | |||||
| Nov 17, 2017 at 2:03 | history | answered | Tyler Brooks | CC BY-SA 3.0 |