LED driving circuit

Patent metadata

Field	Value
Publication number	US-8941310-B2
Application number	US-201013391109-A
Country	US
Kind code	B2
Filing date	Aug 18, 2010
Priority date	Aug 18, 2009
Publication date	Jan 27, 2015
Grant date	Jan 27, 2015

Abstract

An LED (Light Emitting device) driving circuit is disclosed, the circuit characterized by: at least two LED strings ( 120 ); at least two constant current control blocks ( 140 ) for respectively controlling a current path of the at least two LED strings; a detector ( 160 ) for detecting a voltage in the at least two constant current control blocks; and a power supply ( 200 ) for supplying a driving power to the at least two LED strings ( 120 ) in response to the detected voltage.

First claim

The invention claimed is:

1. An LED (Light Emitting Device) driving circuit, the circuit comprising:
an LED string including at least an LED;
a constant current control block configured to control a current path of the LED string;
a detector configured to detect a voltage in the current control block;
a switched-mode power supply (SMPS) configured to transform inputted power in response to the voltage from the detector;
a DC-DC converter configured to convert the power out…

Assignees

• Kim Sungeun
• Lg Innotek Co Ltd

Inventors

• Kim Sungeun

Classifications

• H05B45/46

  Electricity · mapped topic

• H05B45/48 Primary

  Electricity · mapped topic

• H05B45/44

  Electricity · mapped topic

• H05B45/3725 Primary

  Electricity · mapped topic

• Y02B20/30

  Cross-Sectional Technologies · mapped topic