LIGHT EMITTING DIODE ARRAY DRIVING APPARATUS
2 Assignments
0 Petitions
Accused Products
Abstract
There is provided a LED array driving apparatus for driving a light emitting array having a plurality of LEDs connected to one another, including: a DC-DC converting part; a current/voltage detecting part detecting a magnitude of a first current flowing through a switching transistor of the DC-DC current converting part to correspondingly output a first current detection voltage, detecting a magnitude of a both-end voltage of the LED array to correspondingly output a LED array detection voltage, and detecting a magnitude of a current flowing through the LED array to correspondingly output a second current detection voltage; and a constant current controlling part controlling an on/off duty of the switching transistor according to the magnitude of the first current detection voltage, the second current detection voltage and the LED array detection voltage detected by the current/voltage detecting part.
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Citations
13 Claims
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1-6. -6. (canceled)
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7. A light emitting diode array driving apparatus for driving a light emitting array having a plurality of light emitting diodes connected to one another, comprising:
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a direct current-direct current converting part converting an input voltage into a voltage appropriate for driving an LED array, and including a first and second inductor, a first and second capacitor, switching transistor and a first diode; a current/voltage detecting part detecting a magnitude of a first current flowing through the switching transistor to correspondingly output a first current detection voltage, detecting a magnitude of a both-end voltage of the light emitting diode array to correspondingly output a light emitting diode array detection voltage, and detecting a magnitude of a current flowing through the light emitting diode array to correspondingly output a second current detection voltage; and a constant current controlling part controlling an on/off duty of the switching transistor according to the magnitude of the first current detection voltage, the second current detection voltage and the light emitting diode array detection voltage detected by the current/voltage detecting part. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification