Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1432
| Posted: 07:13pm 02 Sep 2017 |
Part 12: EG8010 variable output frequency
I have now a couple of broken EGS002 boards with gate drive ICs that were stuffed to some degree or other. It was time to see if the variable output frequency function works.
I lifted pin 19 to allow me to pull it up to 5V
Pin 19 now high, pin 18 low from the preexisting 50Hz setting now leaves
the EG8010 at 0 - 100Hz mode.
Also I lifted pin 16 and via a pot I feed 0 - 5V
It works as advertised. You can get nearly any frequency from 0 to 100Hz.
The output frequency variation is not continuous though.
It changes at discrete intervals.
I can only get 50.0, the 50.8, and 51.6 Hz, .. etc
Similarly in the other direction I get 49.0, then 48.4, 47.6 Hz,..
I was wondering if I could feed the output of my PLL program into pin 16 and so
lock the EG8010 output to street power.
Not going to happen via this method.
But it might be good for those people who might want a 240V single phase VFD.
I wonder if I can drive the EG8010 via an externally generated clock?
Maybe use the VCO of a CD40406 (pdf)
wronger than a phone book full of wrong phone numbers