LED driver
First Claim
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1. A LED driver for driving a light emitting diode, comprising:
- a linear mode driver to increase and decrease a linear mode current to make a current flow in the LED at a predetermined target current value and output it to the LED; and
a switch mode driver to increase and decrease a switch mode current depending on whether the linear mode current exceeds a predetermined reference current value and output it to the LED, wherein the current flowing through the LED is equal to the sum of the linear mode current and the switch mode current.
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Abstract
The present invention relates to an LED driver for driving light emitting diodes. The LED driver comprises a linear mode driver to increase and decrease a linear mode current to make a current flow in the LED at a predetermined target current value and output it to the LED; and a switch mode driver to increase and decrease a switch mode current depending on whether the linear mode current exceeds a predetermined reference current value and output it to the LED. Thus, the present invention provides an LED driver having high power efficiency and light efficiency and minimal distortions of a driving current.
20 Citations
12 Claims
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1. A LED driver for driving a light emitting diode, comprising:
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a linear mode driver to increase and decrease a linear mode current to make a current flow in the LED at a predetermined target current value and output it to the LED; and a switch mode driver to increase and decrease a switch mode current depending on whether the linear mode current exceeds a predetermined reference current value and output it to the LED, wherein the current flowing through the LED is equal to the sum of the linear mode current and the switch mode current. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of driving an LED unit, comprising the steps of:
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increasing or decreasing a linear mode current to make a current flow in the LED unit at a predetermined target current value; and increasing or decreasing a switch mode current depending on whether the linear mode current exceeds a predetermined reference current value, wherein the current flowing through the LED is equal to the sum of the linear mode current and the switch mode current. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification