Feedback Control System Design for High Frequency Converter

• Main Author: Khalid, Nurul Ilmi
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi Petronas 2008
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://utpedia.utp.edu.my/7217/1/2008%20-%20Feedback%20control%20system%20design%20for%20high%20frequency%20converter.pdf; http://utpedia.utp.edu.my/7217/

A new control scheme for a switch-mode power converter is proposed. A dynamic programming approach is applied to a buck converter switching regulator powering the load with abruptly varying load voltage and with abruptly powering changing load current. This approach can be applied to other switch-mode topologies. The voltage mode control is applied as it varies the duty cycle and essentially adjusts the input voltage drive to the buck LC components which directly affects output voltage. A closed-loop control system automatically maintains a precise output voltage regardless of varying input and load conditions. In simulation, the performance efficiency is slightly dropped by 4% but this feedback control system resulted in good regulation that holds a constant output under changing load condition. The gain of the feedback is limited to avoid instability. A maximum range of duty ratio gives advantages to widen the operation of DC-DC converter.