Title :
Ultrafast Tracking Power Supply With Fourth-Order Output Filter and Fixed-Frequency Hysteretic Control
Author :
Høyerby, Mikkel C W ; Andersen, Michael A E
Author_Institution :
Motorola, Glostrup
Abstract :
A practical solution is presented for the design of a non-isolated dc/dc power converter with very low output ripple voltage and very fast output voltage step response. The converter is intended for use as an envelope tracking power supply for a radio frequency power amplifier (RFPA) in a TETRA enhanced data service (TEDS) base station. A simple and effective fixed-frequency hysteretic control scheme for the converter (buck with fourth-order output filter) is developed and analyzed. The proposed approach is verified experimentally by a 500 W output prototype, capable of delivering any voltage in the range of 10-30 V within 10 mus with 10 mVpp of output ripple and efficiencies in the 88%-95% range.
Keywords :
DC-DC power convertors; power filters; radiofrequency amplifiers; TETRA enhanced data service base station; envelope tracking power supply; fixed-frequency hysteretic control; fourth-order output filter; nonisolated dc-dc power converter; power 500 W; radio frequency power amplifier; ultrafast tracking power supply; voltage 10 V to 30 V; Bandwidth; Base stations; Filters; Hysteresis; Power supplies; Prototypes; Quadrature amplitude modulation; Radio frequency; Radiofrequency amplifiers; Voltage control; Comparator modeling; envelope tracking; fourth-order filter; high-bandwidth; hysteretic control; self-oscillating;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2008.2002038
