DC Variable Power Supply

Abstract

Thisl paperl presentsl thel designl andl developmentl ofl al simplel butl efficientl digitallyl controlledl regulatedl powerl supplyl ofl al variablel voltagel rangingl froml 0vl tol 300vl withl al maximuml outputl currentl ofl 15Al isl presentedl inl thisl paper.l Thel approachl employedl herel isl generallyl anl embeddedl system,l designedl aroundl anl intelligentl microcontrollerl whichl isl providedl withl al digitizedl referencel voltagel tol controll thel inputl andl thel outputl liquidl crystall displayl forl thel provisionl ofl greaterl precision,l stabilityl andl accuratel resultsl forl electronicl engineeringl laboratoryl experiments. First of all the controller is designed for the power supply to check its stability. We have discussed the design, simulation, and the real time implementation of the PID controller for the DC-DC buck converter. Thel controllerl isl capablel tol drivel thel l outputl volatgel ofl buckl converterl tol trackl thel desiredl voltagel reference,l regardlessl ofl thel inputl voltage.l Thel parametersl arel calculatedl usingl thel transferl functionl ofl thel converterl andl PIDTOOLl ofl MATLAB.l Thel controllerl isl implementedl usingl Arduinol UNO.l Wel havel usedl thel in-buildl arduinol libraryl forl PIDl controller.l Thel parametersl obtainedl inl MATLABl arel fedl tol thel arduinol code. After MATLAB simlulation, the hardware simulation is done using Proteus. The transformer in the beginning is used for AC to DC isolation. After, AC-DC rectification, 220V rms voltage is fed to the drain of MOSFET and its gate is given the PWM which is generated using arduino UNO. The feedback of the buck_converter is fed back to arduino, and the output voltage is controlled.