Method for closed-loop control of a DC-DC voltage converter comprising a plurality of interlaced cells operating in zero-voltage switching mode
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United States of America Patent
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Mar 25, 2014
Grant Date -
Dec 29, 2011
app pub date -
Jun 22, 2011
filing date -
Jun 25, 2010
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Abstract
A DC-DC voltage converter operating in zero-voltage switching mode with a switching threshold includes a plurality of interlaced cells, each cell having at least two controlled switches that are configured to be alternately closed and open, and each cell having an inductor in which an output current from the cell flows. The converter also includes a clock with a given switching period configured for triggering the switching of the switches between upper and lower control thresholds. A method for closed-loop control of the converter includes measuring, for each cell, an overrun period, determining a correction time corresponding to a minimum overrun period measured for the plurality of cells during an interlacing cycle, calculating an optimized switching period for the clock, and applying the optimized switching period to the clock to provide closed-loop control of the interlacing of the output currents from the plurality of cells of the converter.
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