Abstract:

In order to adjust the output voltage and eliminate the voltage ripple of the full-bridge series resonant converter, a passivity-based control method is employed to construct a new model of the converter and to control it. In the investigation, an Euler-Lagrange model of the converter is built, and a nonlinear passive controller is de- signed according to the concept that ＂damping injection makes the system stable＂ and Lyapunov stability theory. Simulated and experimental results show that, the response curves of both the output voltage and the inductance current jump with the random input disturbance and especially with the variable load parameter, then return to the equilibrium point; and that the controller is characterized by stable and adjustable output voltage, strong robustness, high speed, good tracking ability, and small voltage ripple.

Key words: series resonance, voltage ripple, passivity-based control, robustness