DRIVING APPARATUS AND DRIVING METHOD OF LED DEVICE
First Claim
1. A driving apparatus of a light emitting diode (LED) device including, a plurality of LED channels, each LED channel including a plurality of LEDs connected in series, the apparatus comprising:
- a power converter having an output terminal connected to a first terminal of each LED channel, and configured to convert an input voltage into an output voltage to output the output voltage to the output terminal;
a plurality of current controllers corresponding to the plurality of LED channels, respectively, each current controller connected to a second terminal of a corresponding LED channel, and configured to control a current of the corresponding LED channel;
a voltage sensor configured to output a sensed voltage corresponding to the output voltage of the output terminal; and
a fault controller configured to determine whether to stop operation of the power converter by comparing the sensed voltage with a reference voltage.
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Abstract
A driving apparatus of an LED device is provided. The LED device includes a plurality of LED channels, and each LED channel includes a plurality of LEDs connected in series. A power converter has an output terminal connected to a first terminal of each LED channel, and converts an input voltage into an output voltage to output the output voltage to the output terminal. A plurality of current controllers correspond to the plurality of LED channels, respectively. Each current controller is connected to a second terminal of a corresponding LED channel, and controls a current of the corresponding LED channel. The voltage sensor outputs a sensed voltage corresponding to the output voltage of the output terminal. The fault controller determines whether to stop operation of the power converter by comparing the sensed voltage with a reference voltage.
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Citations
19 Claims
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1. A driving apparatus of a light emitting diode (LED) device including, a plurality of LED channels, each LED channel including a plurality of LEDs connected in series, the apparatus comprising:
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a power converter having an output terminal connected to a first terminal of each LED channel, and configured to convert an input voltage into an output voltage to output the output voltage to the output terminal; a plurality of current controllers corresponding to the plurality of LED channels, respectively, each current controller connected to a second terminal of a corresponding LED channel, and configured to control a current of the corresponding LED channel; a voltage sensor configured to output a sensed voltage corresponding to the output voltage of the output terminal; and a fault controller configured to determine whether to stop operation of the power converter by comparing the sensed voltage with a reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A driving method of an LED device including a plurality of LED channels, each LED channel including a plurality of LEDs connected in series, the method comprising:
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converting an input voltage into an output voltage at a first time; transferring the output voltage to the LED channels through an output terminal; comparing a sensed voltage corresponding to the output voltage with a reference voltage; and stopping operation for converting the input voltage into the output voltage when the sensed voltage is lower than the reference voltage at a second time when a predetermined period passes from the first time. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification