发明名称 |
Lighting devices including current shunting responsive to LED nodes and related methods |
摘要 |
A solid state lighting device may include a power supply and a light emitting device electrically coupled between the power supply and a reference node, with the light emitting device defining a node. A control element may be provided in a current shunting path electrically coupled in parallel with the light emitting device between the power supply and the reference node, with the control element being configured to control a voltage drop across the current shunting path responsive to an electrical signal from the node of the light emitting device. Related methods are also discussed. |
申请公布号 |
US8847516(B2) |
申请公布日期 |
2014.09.30 |
申请号 |
US201113323074 |
申请日期 |
2011.12.12 |
申请人 |
Cree, Inc. |
发明人 |
Chobot Joseph P. |
分类号 |
H05B37/02 |
主分类号 |
H05B37/02 |
代理机构 |
Myers Bigel Sibley & Sajovec, P.A. |
代理人 |
Myers Bigel Sibley & Sajovec, P.A. |
主权项 |
1. A device comprising:
a power supply; a light emitting device electrically coupled between the power supply and a reference node, wherein the light emitting device defines a node; a control element in a current shunting path electrically coupled in parallel with the light emitting device between the power supply and the reference node, wherein the control element is configured to control a voltage drop across the current shunting path responsive to an electrical signal from the node of the light emitting device, wherein the control element comprises a regulating transistor and wherein a control electrode of the regulating transistor is electrically coupled to the node of the light emitting device; a switching transistor electrically coupled in series with the regulating transistor in the current shunting path between the power supply and the reference node; and a controller coupled to a control electrode of the switching transistor, wherein the controller is configured to generate a pulse width modulated control signal that is applied to the control electrode of the switching transistor to vary a current though the current shunting path. |
地址 |
Durham NC US |