Hi,
My intended application is to generate a very small Guass(less than +/-2 Guass, based on inductor polarity with current required is less than 5mA) magnetic field through an inductor. My inductor inductance and resistances are 200uH and 15Ohm and I have 5V power supply. Guass produced by inductor is sensed by Guass meter and should be FED back to a control circuit to control the current in inductor in closed loop. Voltage output produced by Guass meter should be compared to 2.5V reference voltage to control the field.
I had been thinking to use some PI controller based PWM driving scheme, but it has a limitation to control the inductor current only in one direction so can produce the magnetic field in only one direction.
Please suggest me if someone have an idea to implement the same. My response time for closed loop should be less than 500us.
Regards
Umesh