Renewable Energy resources are an important aspect of sustainability. The world’s energy needs will reduce by one-third by 2050 if individuals and corporations save energy and depend on renewable energy sources. We need to control energy from renewable sources by interfacing particular type of converter which is suitable for the renewable source. If we consider solar application, the output of solar panel (i. e. input to converter) depends upon solar radiation. The energy from renewable sources are fluctuating because of nature. So, they give output also fluctuating. But for our applications there should not be any voltage variations even when load changes which is possible with the help of closed loop control of Converter. The control design can be done with the help of K factor method. This paper describes closed loop control design and operation of dc-dc converter (buck, boost and buck-boost model) used for renewable applications. © Springer Science+Business Media Singapore 2017.