Analysis, Design and Modeling of DC-DC Converter Using Simulink

The purpose of this study is to model a synchronous switching step-down regulator using simulink and to characterize individual sub-blocks like buck converter, OTA, Comparator, gate drive circuitry and digital logic to facilitate easy and less expensive IC implementation. Small signal model of buck converter is developed considering components parasitics and various transfer functions are evaluated. A simple graphical method is deduced from traditional graphical method to arrive at loop transfer function for voltage control, current control and state of the art V2 control scheme easily. The loop transfer function is examined for its stability and compensation techniques are presented for stable closed loop operation. The complete simulink block diagram is built from parameterized sub-blocks for voltage and V2 control scheme. All the three control schemes are compared for different figures of merit. The system is simulated and transient response for load and line variations for voltage and V2 schemes are compared. Inferences are drawn for current mode control and it is concluded that V2 has fastest transient response with easy compensation and less stringent bandwidth requirement of OTA. The simulink model verified the figure of merits of V2 control scheme for which negligible literature exists on its small signal model and compensation. The modeling method and graphical analysis can be easily applied to any converter topology and control schemes.School of Electrical & Computer Engineerin

Cloud Computing - Technology and Practices

In the era of the Internet of Things and Big Data, Cloud Computing has recently emerged as one of the latest buzzwords in the computing industry. It is the latest evolution of computing, where IT recourses are offered as services. Cloud computing provides on-demand, scalable, device-independent, and reliable services to its users. The exponential growth of digital data bundled with the needs of analysis, processing and storage, and cloud computing has paved the way for a cheap, secure, and omnipresent computing framework allowing for the delivery of enormous computing and storage capacity to a diverse community of end-recipients. Clouds are distributed technology platforms that leverage sophisticated technology innovations to provide highly scalable and resilient environments that can be remotely utilized by organizations in a multitude of powerful ways. The term cloud is often used as a metaphor for the Internet and can be defined as a new type of utility computing that basically uses servers that have been made available to third parties via the Internet