Double Loop Control of Boost Converter based Current Switching Controller and Voltage Compensator

Hybrid modeling method provides a natural way to model the power converter, it describes the behavior of the converter more accurately in sense of no approximation. The switching control method based on the hybrid model can realize the stable regulation of the output voltage. However, the switching controller designed based on the common Lyapunov function (CLF) would lead to steady state error, when the input voltage and the load changes. To solve this problem, we propose a Proportional-Integral (PI) current reference regulator to be used together with the current loop switching controller. The merits of this double loop control are that, firstly, the stability the control system is guaranteed by Lyapunov function of the switching control method and the steady state error which caused by parameters variation is eliminated by the PI reference regulator, two parts of the integration method design separately but use together; secondly, the proposed double loop control method does not need to measure the input voltage and the load of the converter, thus simplified the control system structure. The proposed method has been validated by both simulation and experiment, and the comparison results show the effectiveness and superiority of the integration method.