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 and a first current controller coupled in parallel with the first luminescent device. The first current controller is configured to conduct a second current according to a voltage established across the first current controller and regulate the second current so that a sum of the first current and the second current does not exceed a first value. The second driving stage includes a second luminescent device driven by a third current and a second current controller coupled in series to the second luminescent device. The second current controller is configured to conduct a fourth current according to a voltage established across the second current controller and regulate the fourth current so that a sum of the third current and the fourth current does not exceed a second value.

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; anda first current controller coupled in parallel with the first luminescent device and configured to conduct a second current according to a voltage established across the first current controller and regulate the second current so that a sum of the first current and the second current does not exceed a first value; and a second driving stage including:
a second luminescent device coupled in series to the first luminescent device for providing light according to a third current; anda second current controller coupled in series to the second luminescent device and configured to regulate the third current so that the third current does not exceed a second current setting which is larger than the first value, wherein each of the first and second luminescent devices includes one LED or multiple LEDs.