Method and apparatus for synchronization of pulse width modulation
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United States of America Patent
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Feb 24, 2015
Grant Date -
Jun 21, 2012
app pub date -
Dec 16, 2010
filing date -
Dec 16, 2010
priority date (Note) -
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Abstract
An inverter executing a PWM routine is configured to synchronize the switching periods of the PWM routine to an external signal. The external signal is generated, for example, by another inverter, a converter, or a high level controller. The external signal is preferably generated periodically, and the switching period is resynchronized to the external signal each time the external signal is received. Optionally, either the start time or the midpoint of the switching period may be aligned with external signal. Further, the external signal may be sent to multiple inverters. Preferably, a first portion of the inverters align the start time of their respective switching period to the external signal and a second portion of the inverters align the midpoint of their respective switching period to the external signal.
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