Patent ID: 9750099
Date: 2017-08-29
CPC Classifications: H05B

Claim:
1. A light emitting device with one or more low voltage-endurance components, the light emitting device comprising: a light emitting diode string comprising M first light emitting diodes connected in series, and one end of the light emitting diode string coupled to a node of an input voltage; M first control circuits, each of which comprises a first switch that is connected to corresponding one of the M first light emitting diodes in parallel and configured to selectively enable a bypass current path; a detection circuit configured to detect a current, flowing through one or more of the M first light emitting diodes, to produce a current detection signal when the input voltage is applied to the light emitting diode string; a current control circuit coupled to the M-th first control circuit of the M first control circuits and the detection circuit and configured to in response to the current detection signal control the M-th first control circuit of the M first control circuits to provide a preset voltage to the first switch in the M-th first control circuit of the M first control circuits, so as to electively enable the bypass current path; wherein when the first switch in the M-th first control circuit of the M first control circuits does not enable the bypass current path, in response to a potential of the input voltage the M-th first control circuit of the M first control circuits further selectively controls the (M−1)th first control circuit of the M first control circuits to provide the preset voltage to the first switch in the (M−1)th first control circuit of the M first control circuits, and M is a positive integer larger than 1.