| Electronics > Projects, Designs, and Technical Stuff |
| Ideas for measuring Inductance in dependence of DC Current |
| << < (3/3) |
| Doctorandus_P:
Use a DC voltage and your inductor which get switched to GND with a beefy MOSFET. Then turn the MOSFET on with short pulses and measure the current through your inductor (with a non-inductive power transistor). This is a nice and easy way to measure the inductor saturation characteristics. On a sidenote: Some 100 years ago, (before most elecronics) there were special transformers / inductors especially designed to switch AC currents. When the switch is "off" then it acts as a large inductor (Several Henry's, just like a regular transformer). When the switch is "on" a DC current is pushed through a separate winding to saturate the core of the transformer, which allowed a large current to pass through the AC winding. |
| Ysjoelfir:
Another update: I tried the ideas you proposed and especially the idea duak wrote seems to be a nice idea since It can involve one of the devices we produce - which is always nice if you present the project to your boss :) Also, all PSUs we have at hand max out at 20A, so that is a bit of a problem which could be solved with a capacitor bank discharging into the inductor. So I guess this method could be a good idea, I will definitely try that out. Should be pretty close to what Doctorandus_P suggested. (Nice sidenote btw! I love to learn about those ancient technologies!) The quadruple capacitor + LCR meter version I didn't try so far, but I soon will. Have to do some other measurements right now, like measuring the self resonance frequency. I will try biasing the inductors while doing so to see how the resonance peak changes. Could also be a way to tackle the problem. Basically as Tim proposed. |
| Conrad Hoffman:
This is a common measurement, or at least it was. Search out the General Radio Corp. Incremental Inductance Bridge, 1633-A. You can probably download the manual to see how they did it. Sometimes things were more straightforward with old floating bridges, rather than modern LCR meters, but the old ways might give you some ideas. |
| voltsandjolts:
Cross-reference: https://www.eevblog.com/forum/projects/inductor-saturation-tester-alternative-route-to-dump-the-excess-energy/ |
| Navigation |
| Message Index |
| Previous page |