Guru
Joined: 13/10/2014
Location: AustraliaPosts: 1860
| Posted: 04:42am 14 Jan 2023 |
I have two 3 stack blue toriod formers removed from some old solar inverter.
The number is MS-226060-2 some reference to "Super MSS" ? Ferrite toriod.
I wound 6 turns of heavy cable through the 3 cores and the measured inductance was 20uH, when I measured the saturation I initially thought the Test rig was causing noise and glitches to show up.
Rebuilt the inductance test with no cables except for the choke under test. The induction into the Scope coax lead was still causing the waveform to be modified, but most of the noise had gone, using a quality thick coax lead and adapter soldered straight to the current shunt reference pickup points fixed that.
The saturation curve is strange in its slope, like no knee just a gentle curve, in both cases of the E-Core V this blue thing, the E-Core gets to around 180A and then changes quickly, the Blue Cores get to 200A and then seem to saturate very slowly after that?
The picture below is 200A per division, the CAP was charged to 90 volts.
It's almost as big as the E-Core and it weighs more.
Thoughts? Am I seeing things.
NOTE : The E-Core has a 1.3mm air gap, without that it saturates at around 60A on this Jig.
Blue toriod choke 200A per division.
The E-Core on same settings.
Test Jig:
.
Edited 2023-01-14 14:43 by KeepIS