Buck converter with PID feedback controller

182

04:03:30

Thankyou, selman, for pointing out the missing ground for IC555 (can't believe I missed that!) and I may have gone a bit overboard with the op amps. The inductor can help with energy storage but doens't seem needed (and seeing as I don't have many to build this I'll leave it out).

PID stands for Proportional, Integral, Derivative. This took me months, but it works.

published 9 years ago

selman

9 years ago

1st, you'll need to ground the 555 timer, it won't work unless there is a ground reference. 2nd, you'r missing the core components of the buck convertor, a diode and an inductor. And the left most OpAmp is redundant. The switching signal which is driving the MOSFET must be have a constant frequency and a varying duty cycle depending on the control action that is given by the controller, but in your circuit the drive signal frequency also varies, a simple opamp PWM will solve this. Anyways nice circuit!!!!

selman

9 years ago

http://everycircuit.com/circuit/4988771282190336 a little fix to get it started.

selman

9 years ago

Glad I helped !!!

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