Pulse width-modulation control device for invertor devices
US5166870A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Oct 16, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0085
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pulse width-modulation control device includes a superposed signal creating circuit for superposing a sine wave signal having a predetermined frequency upon a triangular wave signal as a carrier signal, having a frequency higher than the predetermined frequency to form a superposed signal. A pulse width modulating circuit compares the superposed signal with a predetermined threshold level to form a pulse width modulated signal. A pulse width limiting circuit limits the pulse width of the pulse width modulated signal when the pulse width modulated signal has a pulse width lying outside a predetermined range, and supplies a pulse signal having a pulse width thus limited to a switching device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.