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Ultrafast Tracking Power Supply With Fourth-Order Output Filter and Fixed-Frequency Hysteretic Control

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2 Author(s)
Hoyerby, M. ; Motorola, Glostrup ; Andersen, M.A.E.

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.

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Power Electronics, IEEE Transactions on  (Volume:23 ,  Issue: 5 )