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Solid state Coil driver

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#1 jimm

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Posted 19 August 2013 - 10:24 PM

I looked around the lab and found the original 100W class D prototype coil driver that I built about 15 years ago.

This particular design was meant to drive the extra coil directly , so the the ferrite on the right is the primary/secondary.

The Ic's above the ferrite are high speed gate drivers with "selects" that I used to pulse modulate the coil with an adjustable rate of 1 to 1000 Hz.

The oscillator is an RC Schmidt trigger inverter with a frequency range from 800KHZ to 1.3MHZ.

 

 

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#2 geoalg

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Posted 20 August 2013 - 02:01 AM

Nice work. Do you have any references to the oscillator circuit?


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#3 jimm

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Posted 20 August 2013 - 03:34 PM

Nice work. Do you have any references to the oscillator circuit?

 

Yup, found this excellent app note from fairchild:

http://www.fairchild...n/AN/AN-118.pdf

 

The RC version isn't what one might use for communications quality stability, but certainly works well for this application.

 

In my design, the oscillator drives a "d type" flip flop in toggle mode to ensure symmetry at the fet gates .


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