The main contribution is linearising the non-linear system such as the DC-DC buck converter and self-tuning, as well as testing the performance of the system when it is disturbed. It is found that the DC-DC buck converter's response time is very short and that the system has a much faster and smoother response at less than 2 ms. Furthermore, a critical review of the recent publications in this field is introduced. This book is developed through seven chapters as explained in the guideline of this book.