I am trying to figure out a way to create a high current ripple through and inductor, similar to that of the ripple the inductor sees in a SMPS. I would like to put a 2A peak to peak 400KHz current through a 10uH inductor. It is alright if it is a sinusoidal waveform rather than the saw tooth the inductor sees in a SMPS.
Ideas I have tried:
-Find a high enough power AC supply that operates at 400kHZ. I have not been able to find a supply with a high enough power rating that can generate 400kHz.
-Use a transformer with a very high turns ratio to step down the voltage/step up the current from a low current signal generator. The issue is that at 400kHz, a 10uH part has a relatively high impedance and I would need a very high input voltage to obtain 2A across that high of a load impedance.
-Use a H-bridge to drive current through the inductor in each direction. The issue here is I need a DC current through the part as well, and I can not vary the inductance or frequency so I am unable to vary the ripple at all.
-Design a buck converter for the DC and ripple current I want. This works, but I need to test many parts at the same time so I would need many buck converter circuits.