Title :
Envelope tracking power supply with fully controlled 4th order output filter
Author :
Høyerby, Mikkel C W ; Andersen, Michael A E
Author_Institution :
Oersted, Danmarks Tekniske Universitet, Copenhagen, Denmark
Abstract :
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/μs slew rate with 40mVpp of output ripple and efficiency above 90%.
Keywords :
DC-DC power convertors; power amplifiers; power filters; quadrature amplitude modulation; radiofrequency amplifiers; telecommunication power supplies; 18 A; 40 mV; 50 kHz; 500 W; DC-DC power converter; RFPA; analog control scheme; communications system base station; envelope tracking power supply; fourth order output filter; fully controlled filter; linear model; output ripple voltage; output voltage slew rate; power converter design; quadrature amplitude modulation based system; radio frequency power amplifier; Base stations; Communication system control; Low voltage; Nonlinear filters; Power amplifiers; Power supplies; Power system modeling; Prototypes; Radio frequency; Radiofrequency amplifiers;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2006. APEC '06. Twenty-First Annual IEEE
Print_ISBN :
0-7803-9547-6
DOI :
10.1109/APEC.2006.1620659
