PWM output apparatus and motor driving apparatus
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United States of America Patent
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Aug 26, 2014
Grant Date -
Apr 18, 2013
app pub date -
Oct 5, 2012
filing date -
Oct 5, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A PWM output apparatus includes a calculating circuit configured to calculate an output width of a PWM output signal of a first signal and a second signal, which have phases different from each other, based on a command value of a PWM output. A comparing circuit compares the output width and a reference period which is set longer than a predetermined dead time period. A PWM output signal generating circuit outputs the PWM output signal to a dead time inserting block as a corrected PWM output signal, when a set/clear signal generating circuit outputs the set signal, and carries out a correction of setting the first signal of the PWM output signal to be inactive to output to the dead time inserting block as the corrected PWM output signal, when the set/clear circuit outputs the clear signal. The dead time inserting block corrects the corrected PWM output signal.
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