| US 7,548,443 B2 | ||
| Three-phase PWM-signal generating apparatus | ||
| Koichi Arisawa, Tokyo (Japan); Kazunori Sakanobe, Tokyo (Japan); Yosuke Shinomoto, Tokyo (Japan); and Masaaki Yabe, Tokyo (Japan) | ||
| Assigned to Mitsubishi Denki Kabushiki Kaisha, Chiyoda-ku, Tokyo (Japan) | ||
| Appl. No. 10/580,849 PCT Filed Aug. 10, 2005, PCT No. PCT/JP2005/014658 § 371(c)(1), (2), (4) Date May 26, 2006, PCT Pub. No. WO2006/022142, PCT Pub. Date Mar. 02, 2006. |
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| Claims priority of application No. 2004-248891 (JP), filed on Aug. 27, 2004. | ||
| Prior Publication US 2007/0103950 A1, May 10, 2007 | ||
| Int. Cl. H02M 7/5387 (2007.01) | ||
| U.S. Cl. 363—132 [363/41] | 20 Claims |
| 1. An apparatus for generating a three-phase pulse-width-modulation signal for a three-phase voltage inverter employing a
semiconductor switching element, the apparatus comprising:
a generating unit that generates the three-phase pulse-width-modulation signal based on a combination of three basic voltage
vectors and a zero vector wherein the generating unit includes
a creating unit that creates two basic voltage vectors having a phase difference of 60 degrees and at least a zero vector
by allocating occurrence time ratios for two basic voltage vectors having a phase difference of 60 degrees with a voltage
command vector therebetween and a corresponding zero vector based on the voltage command vector; and
a distributing unit that distributes an occurrence time ratio of the voltage command vector to three basic voltage vectors
having a phase difference of 120 degrees including one of the two basic voltage vectors having a phase difference of 60 degrees,
using three vectors with equal lengths having a phase difference of 120 degrees and constituting a zero vector corresponding
to the voltage command vector, to create three basic voltage vectors having a phase difference of 60 degrees and a zero vector
based on the occurrence time ratio distributed.
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