LIGHT-EMITTING DIODE LIGHTING DEVICE HAVING MULTIPLE DRIVING STAGES

摘要

An LED lighting device includes multiple driving stages. A first driving stage includes a first luminescent device driven by a first current, a second luminescent device driven by a second current, a path-controller for conducting a third current, a first current controller for regulating the first current, and a second current controller for regulating the second current. The second driving stage includes a third current controller coupled in series to the first driving stage and configured to conduct and regulate a fourth current. When the path-controller is turned off, the third current is zero, and the fourth current is equal to the sum of the first current and the second current. When the path-controller is turned on, the first current, the second current, the third current and the fourth current is equal.

主权项

1. A light-emitting diode (LED) lighting device having multiple driving stages, comprising:
a first driving stage including:
a first luminescent device for providing light according to a first current;a second luminescent device for providing light according to a second current;a first current controller coupled in series to the first luminescent device and configured to regulate the first current so that the first current does not exceed a first value;a second current controller coupled in series to the second luminescent device and configured to regulate the second current so that the second current does not exceed a second value;a first path-controller configured to conduct a third current and comprising:
a first end coupled between the second luminescent device and the second current controller; anda second end coupled to the first current controller; and a second driving stage including:
a third current controller coupled in series to the first driving stage and configured to conduct a fourth current and regulate the fourth current so that the fourth current does not exceed a third value.