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For the nonlinear characteristic of buck dc-dc converter and high demand of dynamic quality and robustness for the converter, a passivity-based control with an adjustable parameter for buck converter is proposed. Based on the nonlinear error model of buck converter, a feedback equivalence system is obtained by the way of coordinate transformation. According to passive theory, the feedback equivalent system is to be passive by adding feedback appropriately. The proof of the passivity of closed-loop system is given. And a Lyapunov function is constructed to guarantee asymptotic stability of closed-loop system. Finally, a passive feedback control law for buck converter is derived. Simulate by designing control circuit in Pspice environment, and the simulative results show that the stability of output voltage is effectively controlled by the proposed control method. The controller has very strong robustness for disturbance caused by load change and input voltage change. And the system dynamic response is improved by adjusting the coefficient of the control law.

An Improved Passivity-Based Control to Buck Dc-Dc Converter