Switching Control of Buck Converter Based on Energy Conservation Principle

This brief presents a switching control scheme (SCS) based on the energy conservation principle for buck converters. The concept of the SCS is based on the conservation of energy in circuit. It keeps the balance between the energy that is injected into a circuit and the sum of the energy that is consumed by the load and stored in reactive components. The SCS not only regulates the output voltage of the buck converter accurately under static conditions, but also improves its dynamic responses to disturbances of input voltage and load current. Furthermore, the SCS is capable of operating in both the continuous current mode and the discontinuous current mode, and the stability analysis undertaken using the Lyapunov stability criterion shows that the SCS is stable in all cases. Simulation and experimental results confirm the possibility and attractiveness of using this method to control buck converters.