Output Voltage-Tracking Controller With Performance Recovery Property for DC/DC Boost Converters

This brief proposes an output voltage tracking controller for dc/dc boost converters, ensuring the target closed-loop performance recovery property. The proposed method is designed via a multivariable approach, not a cascade method, accounting for the nonlinearity in the converter dynamics and plant model mismatches. A nonlinear observer is constructed to exponentially identify the disturbances caused by the plant model mismatches without using the true parameters of the converter. The resulting observer acts to recover the target closed loop performance by estimating and canceling the disturbances, besides removing steady state errors. Simulations and experiments are performed to verify the effectiveness of the proposed method by using a 3 kW dc/dc boost converter.