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US 8,941,310 B2Granted
LED driving circuit
AssigneeLG Innotek Co., Ltd.
InventorSungeun Kim
Life of this patent
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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.
Claims6
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 outputted from the SMPS to a power suitable for LED driving to supply the power to the LED string;
- and
- a PWM controller configured to control a switching operation of the SMPS in response to the detected voltage by the detector.
4 more elements
Dependencies are inferred from the claim text.