Sensorless speed detection of a PM brushless motor with phase terminals shorted
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United States of America Patent
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May 24, 2011
Grant Date -
Oct 16, 2008
app pub date -
Feb 7, 2008
filing date -
Apr 13, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
According to one disclosed embodiment, a gate driver circuit for sensorless speed detection and driving a switching stage includes high side and low side switches series connected across a DC bus and having a switching node between the series switches, the gate driver having a bootstrap power supply for powering a high side driver driving the high side switch of the switching stage and a low side driver power supply, and further includes a comparator circuit to periodically compare the voltage between the bootstrap and low side driver power supplies with a threshold and to output a first signal, wherein the first signal indicates current sign and frequency.
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