Vehicle instrument panel lamps, pulse width dimmer system therefor
US5334914A · kind A · utility
9Cited by
2References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1992 |
| Grant date | Aug 2, 1994 |
| Priority date | — |
| Expiry date | Mar 23, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pulse width dimming system responsive to low frequency pulse width modulated signals of various duty cycles employs a single charging capacitor in a charge pump circuit to develop voltage signals for controlling current through a field effect transistor used to control dimming of the intensity of lamps in a vehicle instrument panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.