Patent ID: 9451669
Filing Date: 2016-09-20
CPC Classification: H01L,H05B,Y02B

Claim Text:
1. A light emitting diode protection circuit, comprising: a plurality of diodes connected in series; a first input connected to a first diode of the plurality of diodes; a second input connected to a junction between two of the plurality of diodes, wherein shorting the first input to the second input reduces a breakdown voltage of the plurality of diodes; an output; a first resistor connected between the plurality of diodes and the output; a transistor with a gate connected to a junction between the first resistor and the plurality of diodes and a source connected to the output; a second resistor connected between the first input and a drain of the transistor; and a silicon controlled rectifier (SCR) with an anode connected to the first input, a base connected to the drain of the transistor, and a cathode connected to the output.