Method and apparatus to reduce PWM voltage distortion in...

Details Method and apparatus to reduce PWM voltage distortion in... Method and apparatus to reduce PWM voltage distortion in...

2007-02-20

2008-12-30

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C363S131000, C318S599000, C318S811000

Reexamination Certificate

active

07471526

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.

REFERENCES:
patent: 5450306 (1995-09-01), Garces et al.
patent: 6023417 (2000-02-01), Hava et al.
patent: 6075350 (2000-06-01), Peng
patent: 7307401 (2007-12-01), Gataric et al.
patent: 7391181 (2008-06-01), Welchko et al.
patent: 7411801 (2008-08-01), Welchko et al.

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