Vehicle instrument panel lamps, improved pulse width dimmer system therefor
US5268616A · kind A · utility
6Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1992 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Jun 8, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K2360/349
- WIPO fieldTransport
- WIPO sectorMechanical 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 connected between a voltage source and the output of an FET for developing voltage pulse signals for controlling current through a field effect transistor used to control the intensity of lamps in a vehicle instrument panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.