Patent ID: 9333914
Filing Date: 2016-05-10
CPC Classification: B60Q,G01R,H05B

Claim Text:
1. An LED short-circuit detection circuit comprising: a differential circuit outputting a differential voltage indicating a difference of a first voltage and a second voltage, the first voltage being obtained by a connection point of voltage between a first light emitting diode and a second light emitting diode of an LED chip line formed by connecting a plurality of light emitting diodes in series with each other, and the second voltage being obtained by dividing a forward drop voltage of the LED chip line; and a detection circuit to receive the differential voltage and determine whether the differential voltage falls in a predetermined range, wherein, if the differential voltage does not fall in the predetermined range, the detection circuit detects a short-circuit between one anode of the LED chip line and other anode of the LED chip line, or a short-circuit between an anode of one light emitting diode in the LED chip line and a cathode of the one light emitting diode, and outputs an LED short-circuit detection signal.