Cascaded multi-level H-bridge drive
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United States of America Patent
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Feb 24, 2004
Grant Date -
Nov 20, 2003
app pub date -
Aug 16, 2001
filing date -
Aug 16, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An embodiment of the present invention comprises a multi-level PWM inverter that is constructed by cascading multi-level H-bridge inverters and providing different voltage inputs to the multi-level H-bridges. The values of the voltages, or the ratios of the voltages, are selected in order to provide an increased number of output levels. In the cascaded arrangement, at least one of the multi-level H-bridge inverters has more than three levels. Preferably, at least one of the multi-level H-bridge inverters is a 5-level inverter. According to one aspect of the invention, the cascaded arrangement may use a primary 5-level H-bridge with at least one 3-level H-bridge (referred to as a '5/3H' arrangement). This arrangement can provide up to fifteen output levels if regenerative voltage sources are used, and up to eleven output levels if a non-regenerative voltage sources are used.
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