| 发明名称 |
Method and apparatus for increasing dimming range of solid state lighting fixtures |
| 摘要 |
A device for controlling levels of light output by a solid state lighting load at low dimming levels includes a bleed circuit connected in parallel with the solid state lighting load. The bleed circuit includes a resistor and a transistor connected in series, the transistor being configured to turn on and off in accordance with a duty cycle of a digital control signal when a dimming level set by a dimmer is less than a predetermined first threshold, decreasing an effective resistance of the bleed circuit as the dimming level decreases. |
| 申请公布号 |
US9456486(B2) |
申请公布日期 |
2016.09.27 |
| 申请号 |
US201113634956 |
申请日期 |
2011.03.01 |
| 申请人 |
KONINKLIJKE PHILIPS N.V. |
发明人 |
Datta Michael;Campbell Gregory;Rabiner Mark |
| 分类号 |
H05B37/02;H05B33/08 |
主分类号 |
H05B37/02 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A device for controlling levels of light output by a solid state lighting load at low dimming levels, the device comprising:
a bleed circuit connected in parallel with the solid state lighting load, the bleed circuit comprising a resistor and a transistor connected in series, the transistor being configured to turn on and off in response to a duty cycle of a digital control signal beginning when a dimming level set by a dimmer decreases below a predetermined first low dimming threshold, decreasing an effective resistance of the bleed circuit as the dimming level decreases. |
| 地址 |
Eindhoven NL |
