Power converter with pre-compensation for dead-time insertion
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United States of America Patent
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Jan 24, 2017
Grant Date -
Jul 21, 2016
app pub date -
Jan 21, 2015
filing date -
Jan 21, 2015
priority date (Note) -
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Abstract
A power converter has a phase leg with upper and lower switching devices coupled across a DC link. A junction between the devices is coupled to a load. A current sensor detects direction of current flow from the junction to the load. A gate driver activates the devices according to upper and lower gate signals in response to pulse-width modulation (PWM) to generate nominal gate signals from a variable duty cycle. When the positive current direction is detected then the upper gate signal has turn-on and turn-off times shifted by a predetermined offset with respect to the nominal signals, and dead-times are added to the lower gate signals. When the negative direction is detected then the lower gate signal has turn-on and turn-off times shifted by the predetermined offset with respect to the nominal signals, and dead-times are added to the upper gate signals.
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