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US 7,548,443 B2Granted
Three-phase PWM-signal generating apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKoichi Arisawa, Kazunori Sakanobe, Yosuke Shinomoto, Masaaki Yabe
Life of this patent
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Abstract
An apparatus for generating a three-phase pulse-width-modulation signal for a three-phase voltage inverter employing a semiconductor switching element includes a generating unit that generates the three-phase pulse-width-modulation signal based on at least one combination of three basic voltage vectors and at least a zero vector.
Claims20
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.
1 more element
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, with an occurrence time ratio of a basic voltage vector in a middle of the three basic voltage vectors having a phase difference of 60 degrees set to a predetermined value.
2 more elements
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 120 degrees and at least a zero vector based on the occurrence time ratio distributed.
2 more elements
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,
- when an operation request range on a low speed side is not stringent, a first combination of three basic voltage vectors having a phase difference of 60 degrees and at least a zero vector based on the occurrence time ratio distributed, and
- when the operation request range on a low speed side is stringent, a second combination of three basic voltage vectors having a phase difference of 120 degrees and at least a zero vector based on the occurrence time ratio distributed.
4 more elements
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 two zero vectors 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 two zero vectors based on the occurrence time ratio distributed.
1 more element
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 two zero vectors 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 two zero vectors based on the occurrence time ratio distributed, while changing occurrence time ratios for the two zero vectors at a predetermined rate.
2 more elements
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 two zero vectors, 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 two zero vectors based on the occurrence time ratio distributed, with an occurrence time ratio of a basic voltage vector in a middle of the three basic voltage vectors having a phase difference of 60 degrees set to a predetermined value.
2 more elements
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 two zero vectors, 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 two zero vectors based on the occurrence time ratio distributed, while changing occurrence time ratios for the two zero vectors at a predetermined rate with an occurrence time ratio of a basic voltage vector in a middle of the three basic voltage vectors having a phase difference of 60 degrees set to a predetermined value.
2 more elements
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 and a combination of three basic voltage vectors and two zero vectors, 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 a first combination of three basic voltage vectors having a phase difference of 60 degrees and a zero vector and a second combination of three basic voltage vectors having a phase difference of 60 degrees and two zero vectors, in a switchable manner.
2 more elements
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 and a combination of three basic voltage vectors and two zero vectors, 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 a first combination of three basic voltage vectors having a phase difference of 60 degrees and a zero vector and a second combination of three basic voltage vectors having a phase difference of 60 degrees and two zero vectors, in a switchable manner, while changing occurrence time ratios for the two zero vectors at a predetermined rate.
2 more elements
Dependencies are inferred from the claim text.