Hello,There is a PI controller with certain AC behavior. I need to use this PI controller in order to drive a coil (current controlled oscillator) of 1.5 µH inductance. For DC behavior at 10 mV input I need 50 mA current on the coil at most. PI controller has proportional and integrator property.

How can I convert this behavior into a driver circuit?
Thanks.

 

Sounds like you want
Voltage-to-Current Signal Conversion

I suggest you give that a read. Then Google the title for circuits. Your 50 mA is not a problem, use a transistor to drive your coil. You want similar to this type circuit:



Note I said similar. Component values determine the input verse output.

Ron

 

Hello Ron ,I need to incorporate the PI AC behavior into the driven into the YIG coil.
How do you reccomend to change my PI controller for this goal ?
Thanks .

 

UPDATE:
I have tried to drive the inductor threw NPN.
How do i connect it to the Integrator?
Thanks.

 

Using a 2N2222 NPN I would approach it likely this way:



Ron

 

Hello , two questions
1.how the OPAMP structure represents integrator ? There is a diode in the feedback .
2.what is the logic of connecting the NPN this way ?
Thanks.

 

I am not dure what we are integrating?
The NPN transistor is used for low side switching.

Ron

 

Hello Ron,its not mygoal. I have build a PI controller shown in the first post i want to drive a current to inductor with the same AC behavior.
what configuration you reccomend?
Thanks.

 

I had an eye exam for a cataract and can't see right now. Totally dilated but will get back here when I can better see.

 

OK, my initial take was you were looking for a voltage to current. I was thinking just DC so my bad on that. So you are driving an AC coil correct? What frequency?

Ron

 

Hello Ron , Thank you for the responce.
I am Using YIG as current controlled oscilator.The YIG is a part of a FLL system shown below.
Every feedback system has a regulated error mechamism.My YIG has two coils One is tune (big coil) and FM (small coil)
My feedback is regulated using FM coilby a controller for fine tuning .The Tune coil is being driven by a steady sourse
I managed to build a controller for tining using the FM coil but then I saw that the TUNE coil is drifting.
So the FM coil needs to compensate drift of the Tune coil.
For that I need to drive the FM coil with PI controller behavior because drift is DC error.
photo 1 is the PI controller photo 2 is the current driver that what recomended in the attached article
How do you reccomend to combine the PI controller (voltage to voltage ) with the current driver of the YIG?
Thanks.
https://www.microlambdawireless.com/resources/driverappnote2.pdf