Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1458
| Posted: 03:19am 15 Jan 2023 |
this is how I test inductors.
A FET, driven by a pulse from the Arduino,
width controlled by a pot.
A fast diode for flyback. Any old caps in this case 5 x 4,700uF
Testing the 188uF (as shown by the LCR meter) I get
13.7V average across the choke
pulse width 588uS
max current seen from the current sensor 40.6 A
L = V/I x time = (13.7 /40.6) * 588e-6 = 198 uH
Yellow is gate drive voltage
Pink is voltage across the choke
Light Blue is current
What a nice straight line!
The sensor is a LEM sensor, seen bottom right in the photo.
This setup is not pretty but it works for me.