Noise and Interference Suppression Control Method of DC-DC Buck Converters Based on Cascaded Filter LADRC

Due to the high gain characteristics of the extended state observer (ESO), ADRC technology will be affected by high-frequency measurement noise in the buck circuit, the traditional method of using low-pass filters to filter the output signal will cause loss of amplitude and phase. A novel DC-DC buck noise and disturbance rejection control method based on a filter cascade-based linear active disturbance rejection control (F-CLADRC) is proposed to solve the above problems in this paper. Consequently, while suppressing noise, firstly, it can enhance LADRC’s ability to estimate and compensate for disturbances in real-time. Secondly, it can improve the system’s robustness and ensure the tracking accuracy. Thirdly, it can effectively compensate for the amplitude and phase loss caused by output filtering. A set of simulations conducted on the DC-DC buck converter system show that, the proposed method is more reasonable and effective compared with the conventional control methods.