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Method and apparatus to reduce PWM voltage distortion in electric drives
   
Document Number
US Patent 7471526
Issued Date
December 30, 2008
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Inventors
Bae; Bonho (Torrance, CA)
Hiti; Silva (Redondo Beach, CA)
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Abstract
Methods and apparatus are provided for reducing voltage distortion effects at low speed operation in electric drives. The method comprises receiving a first signal having a duty cycle with a range between minimum and maximum achievable duty cycles, producing a second duty cycle based on the minimum achievable duty cycle if the duty cycle is within a distortion range and less than a first clipping value, producing a second duty cycle based on the closer of minimum and maximum pulse widths if the duty cycle is within the distortion range and between the first and a second clipping value, producing a second duty cycle based on the maximum achievable duty cycle if the duty cycle is within the distortion range and greater than the second clipping value, and transmitting a second signal to the voltage source inverter having the second duty cycle.
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Number of Claims:
20
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Published
December 30, 2008
Application Number
11/676,574
Filed
February 20, 2007
US Classification
363/41   318/599 318/811 363/131
Int'l Classification
H02M   7/537   (20060101)   H02P   23/00   (20060101)  
Examiner
USPTO Field of Search
363/40   363/41   363/42   363/43   363/97   363/98   363/131   363/132   318/599   318/629   318/801   318/811  
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