DIGITAL CONTROL OF A CLOSED LOOP BUCK CONVERTER

The primary focus for the R&D in this areaso far has been to figure out the best approach forevaluating and designing the DC-DC converter andperhaps the most appropriate control technique is beingapplied in different DC-DC converter circuits. Dependingon power handling capacity as well as high-frequencyswitching, certain switching devices are chosen. This paperdiscusses the deployment of the digital PID controllers inthe DC-DC converters. In an attempt to get a quickerresponse, voltage mode control has been used. Digitalcontrollers started replacing traditional analog controllersmore and more. Better immunity to changes in theenvironment which includes temperature and degradationof components, improved versatility by modifying thesoftware, increasing advanced control methods, anddecreased number of the components are the key benefitsof the digital control against the analog control. Astructured and concise strategy for designing a digitallyoperated close-loop Dc / Dc buck converter is discussed inthis paper beginning with the Buck converter and givingthe set of certain performance specification,implementations of the digital Proportional-IntegralDerivative(PID) controller is made. It addresses in depthall the appropriate DSP hardware and/or softwaremethods and approaches needed to implement acontroller. In order to illustrate the efficacy of the model,the dynamic response as well as the steady-stateperformance of controller is provided. The experimentaloutcomes fit well with the model of simulation. During theimplementations of Switch Mode Power Supply (SMPS),application of dsPIC provides new perspectives towardsaffordable and versatile approaches of digital control.