Hello, I want to create high-frequency (10-30kHz) AC magnetic field for nondestructive diagnostic purposes. The magnet is a U-shaped ferrite core with magnetic wire wound around it if that's important.
Now, for actually driving it my plan so far is to just use toneAC library (as shape and purity of the signal is irrelevant for my purposes) and direct its output into transistors/MOSFETS to drive the magnet (as the curret is going be about 5A @ 12V).
But of course it can't be THAT simple, so what am I missing? Do I need to add a diode across the magnet, some capacitors to smooth spikes that I'm sure will be with such rapid switching? I'm not very keen on electronics, so any help will be really appreciated
The best bet would be to use a H-bridge. These are sold as motor drivers or motor shields. If you want to switch 5A then get one that is rated for at least 8A. It should contain diodes, you do not want to have any capacitors as that would spoil the AC.
Can we assume the mix of your ferrite will allow it to function at 10-30 KHz?
Paul
Grumpy_Mike:
The best bet would be to use a H-bridge. These are sold as motor drivers or motor shields. If you want to switch 5A then get one that is rated for at least 8A. It should contain diodes, you do not want to have any capacitors as that would spoil the AC.
Nice, I'll take a look into those
Paul_KD7HB:
Can we assume the mix of your ferrite will allow it to function at 10-30 KHz?
Paul
Wow, never even considered this a problem. I have two cores, one of which is from a flyback transformer of CRT monitor and the other is some ubiquitous ferrite core I bought off the internet. I guess I'll see which one is better.
Hi,
You will need to look up flux density and other magnetic parameters, along with types of material to make sure you do not saturate the magnetic core.
Tom.... 