Dimming circuit for controlling luminance of light source and the method for controlling luminance
US8063583B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 9, 2009 |
| Grant date | Nov 22, 2011 |
| Priority date | — |
| Expiry date | Mar 30, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a dimming circuit for controlling the luminance of a light source and the method for controlling luminance. The dimming circuit comprises an inverter circuit and a driving circuit. The inverter circuit is electrically coupled to a light source to be controlled, to convert a direct current (DC) power input into an alternating current (AC) power. The inverter circuit comprises a transformer, a capacitor connected in parallel to the transformer, a plurality of switches located at both ends of the capacitor, and an oscillating circuit electrically connected to both ends of the transformer. The driving circuit is electrically connected to the inverter circuit, for regulating the AC voltage to control the time period that the light source is turned on. As the input of DC voltage into the transformer is stopped, the driving circuit opens the plurality of switches in the inverter circuit, forming electrical isolation between the capacitor and the transformer, which prevents voltage oscillation and stores the energy into the capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.