DCM control method of boost converter based on conventional CCM control

摘要

This paper proposes current control method for DCM to achieve same control performance as CCM. The proposed control loop is designed based on the conventional current control loop in CCM. By using only one PI controller and introduction of two correction factors, the proposed control method can control both CCM and DCM current exactly to design values. In this paper, the operation of the proposed control method is confirmed by simulation and experiment. The simulation results of the current response in both CCM and DCM agree with design values. In the experimental results, due to the delay in feedback, error 11.3% in rise time and error 2.5 point in overshoot occur. Furthermore, the voltage regulation experiment with the proposed current controller as a inner control loop is conducted. As load varies, the recovery time for the output voltage regulation is about 20 ms and the overshoot - undershoot voltage is below 3%.