| US 7,471,526 B2 | ||
| Method and apparatus to reduce PWM voltage distortion in electric drives | ||
| Brian A Welchko, Torrance, Calif. (US); Bonho Bae, Torrance, Calif. (US); Steven E. Schulz, Torrance, Calif. (US); and Silva Hiti, Redondo Beach, Calif. (US) | ||
| Assigned to GM Global Technology Operations, Inc., Detroit, Mich. (US) | ||
| Filed on Feb. 20, 2007, as Appl. No. 11/676,574. | ||
| Prior Publication US 2008/0197902 A1, Aug. 21, 2008 | ||
| Int. Cl. H02M 7/537 (2006.01); H02P 23/00 (2006.01) | ||
| U.S. Cl. 363—41 [363/131; 318/599; 318/811] | 20 Claims |
| 1. A method for controlling a voltage source inverter, the voltage source inverter having minimum and maximum pulse widths,
and an output voltage distortion range outside of the minimum and maximum pulse widths, the method comprising:
receiving a first signal having a duty cycle, the duty cycle having a range from a minimum achievable duty cycle to a maximum
achievable duty cycle;
producing a second signal if the duty cycle of the first signal is within the output voltage distortion range and less than
a first clipping value, the second signal having the minimum achievable duty cycle;
producing a third signal if the duty cycle of the first signal is within the output voltage distortion range and one of the
duty cycle of the first signal is greater than or equal to a first clipping value or the duty cycle of the first signal is
less than or equal to a second clipping value, the third signal having a closer one of the minimum and maximum pulse widths
to the duty cycle of the first signal, the second clipping value greater than the first clipping value;
producing a fourth signal if the duty cycle of the first signal is within the output voltage distortion range and greater
than the second clipping value, the fourth signal having the maximum achievable duty cycle; and
transmitting one of the second, third, and fourth signals to the voltage source inverter.
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