Hi,

I need to design a current source that will feed an induction coil to magnetize a soft magnetic core.The current source needs to be controlled by a micro-controller. the current source must be able to deliver a max current of 1 Amp (sinocide) with a voltage of 5 V peak to peak.

I get the idea I need a power amplifier or a howland current pump, but I am not sure, where to start or how to design it.

any insights will be very much appreciated.

Best Regards,
Mubeen Haadi.

 

You are sure you want AC? The Magnet Chargers I have worked with in the past generally consisted of a bank of parallel capacitors which were rapidly discharged through a Triac into a coil. The magnet material was placed in the coil. Magnets which were over charged (high Gauss) were demagnetized or "knocked down" by passing AC through the coil. I am assuming you want to charge magnets which may be way off base here.

Ron

 

Hi, thank you for showing concern. Basically I want to create the hysteresis graph for a toroidal core. so I have to control the excitation current to the primary coil. e.g I want to excite the primary with 1 Amp, .5 Amp and than with 2 Amp, also it would be nice to have a control over the frequency of the output, 50 - 150 Hz. The following figure should give you a brief idea. now I want to use OPA547 but I am not sure how to accomplish this.

I saw a few application circuits, but I am not sure where to start.

 

Ah, thank you, now I understand what you are looking to do. Hopefully another member can be of some help.

Ron