BCM current self-recovery and digital predictive ripple control circuit for boost converter

In order to solve the error caused by inductor mismatch, and the induced boundary conduction mode (BCM) control issues, this paper proposes a current self-recovery and digital predictive ripple control circuit for boost converter. According to the inductor ripple current the proposed controller predict the turn-on and turn-off time of the main switch, and then achieves BCM operation. Based on a damped inductor current model, the controller is proved to have a BCM-self-recovery feature. Therefore, current sensor or zero-current detection circuit, which is often used in BCM operation, is eliminated. When there is inductance mismatch, the controller can also maintain consistent BCM operation. Furthermore, the proposed current model indicates the behavior of inductor current under the influence of parasitic parameters, which has potential values in analyzing and optimizing the power stage. Simulation and experimental results verify the self-recovery feature and inductance deviation tolerance feature in a boost converter under predictive ripple current control.