Control apparatus for PWM-controlled, variable voltage/variable frequency inverters
US4924168A · kind A · utility
13Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1989 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Jul 12, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/529
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a PWM-controlled, variable voltage/variable frequency inverter, a pulse mode, which is identified by a number of voltage pulses within one cycle of an output AC voltage of the inverter, is changed in accordance with a frequency of the output AC voltage and an output AC voltage factor, which is a ratio of an output AC voltage to be produced by the inverter at that time to a maximum value of the output AC voltage which can be produced under a then-present value of a voltage of a DC voltage source for the inverter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.