Envelope tracking power supply with fully controlled 4th order output filter

• Published in: Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06 p. 8 pp.
• Main Authors: Hoyerby, M.C.W., Andersen, M.A.E.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2006
• Subjects: Base stations; Communication system control; Low voltage; Nonlinear filters; Power amplifiers; Power supplies; Power system modeling; Prototypes; Radio frequency; Radiofrequency amplifiers
• ISBN: 0780395476; 9780780395473
• ISSN: 1048-2334; 2470-6647
• DOI: 10.1109/APEC.2006.1620659

This paper describes the derivation of a practical solution to designing a medium-power non-isolated DC/DC power converter with very low output ripple voltage and very high output voltage slew-rate capability. The converter is intended for powering and efficiency-optimizing an RFPA (Radio Frequency Power Amplifier) in a communications system base station. A simple and effective analog control scheme for the converter (buck with 4th order output filter) is developed, along with an accurate linear model The proposed approach is verified experimentally by a 500W output prototype, capable of greater than 1 V//spl mu/s slew rate with 40mVpp of output ripple and efficiency above 90%.