Active current sharing circuit
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United States of America Patent
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May 17, 2005
Issued Date -
N/A
app pub date -
Mar 3, 2003
filing date -
Feb 28, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An active current sharing circuit that provides a plurality of paralleled DC-DC converters each having a lossless inductor-based current sensing circuit for sensing the average current of the associated DC-DC converter through its output inductor, and a means for adjusting the voltage reference coupled to each of the DC-DC converter's PWM controllers through a one pin interconnection between the converters. The circuit provides a high percentage current sharing level at lower cost, with reduced circuit wiring complexity, and fewer components. In an alternate embodiment, the inductor-based current sensing is replaced with a resistor-based current sensing, such that comparable current sharing levels are achieved albeit with higher loss.
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