Electricity: power supply or regulation systems – Output level responsive – Using a transformer or inductor as the final control device
Patent
1996-10-25
1997-09-16
Sterrett, Jeffrey L.
Electricity: power supply or regulation systems
Output level responsive
Using a transformer or inductor as the final control device
323282, 363 46, G05F 124
Patent
active
056684649
ABSTRACT:
An active filter provides ripple cancellation in a DC-DC converter. The feedforward filter applies to any converter with an output filter inductor. The filter is inherently stable, performs in both continuous and discontinuous conduction modes, and applies to resonant converters. A suitable linear amplifier, combined with a current transformer, results in a low loss implementation. An adaptive tuning scheme compensates for inductance variation and drift. The filter is usable with buck, push-pull, and boost converter topologies. The result is output ripple below 10 mV.sub.RMS. The filter is effective on converters with outputs as low as 2 V and currents beyond 30 A.
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Krein Philip T.
Midya Pallab
Sterrett Jeffrey L.
The Board of Trustees of the University of Illinois
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