US Patent No. 11,071,185

LED ARRANGEMENT WITH OVER-CURRENT PROTECTION


Patent No. 11,071,185
Issue Date July 20, 2021
Title Led Arrangement With Over-current Protection
Inventorship Yuhong Fang, Naperville, IL (US)
Ernesto Mendoza, Rosemont, IL (US)
Ameya Dilip Shrotriya, Schaumburg, IL (US)
Assignee Signify Holding B.V., Eindhoven (NL)

Claim of US Patent No. 11,071,185


1. An LED board adapted to be wire-connected to a separate LED driver, comprising:a circuit board which carries:an arrangement (D1, D2, D3, D4) of LEDs;
a current sensor for sensing a current flowing through the arrangement of LEDs;

a cut-off switch (W1) in series with the arrangement of LEDs;
a switch control circuit which is adapted to control the cut-off switch in dependence on the sensed current;wherein the switch control circuit comprises a reference voltage unit and a comparison circuit for comparing the current sensor signal with a voltage reference set by the reference voltage unit; and
wherein the reference voltage unit comprises a resistor-diode circuit (R1, C1, D5) for generating an internal supply voltage and a resistor divider (R3, R4) for generating the reference voltage from the internal supply voltage.