Light-emitting diode module and method for operating the same

摘要

A light-emitting diode (LED) module and a method for operating the same are disclosed. The LED module is supplied through an external voltage source. The LED module includes a bridge rectifying unit, a LED unit, and an integrated circuit (IC) unit. The bridge rectifying unit rectifies the external voltage source into an inner DC voltage source. The LED unit is electrically connected to the bridge rectifying unit and driven through the DC voltage source. The IC unit is electrically connected to the bridge rectifying unit and the LED unit and is supplied through the DC voltage source, thus providing a piecewise constant-current control or a piecewise variant-current control to the LED unit.

主权项

1. A light-emitting diode module, comprising:
a light-emitting diode unit having a plurality of light-emitting diode strings electrically connected in series; and an integrated circuit unit coupled to the light-emitting diode unit, and comprising:
a first constant-current source for providing a first current;a second constant-current source for providing a second current which is greater than the first current;a first switch element coupled to the first constant-current source;a second switch element coupled to the second constant-current source; anda controller configured to control the first and second switch elements in a way such that the first and second constant-current sources are set to alternately provide different currents in response to a first voltage and a second voltage which is greater than the first voltage.