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US 9,288,862 B2Granted
LED lighting apparatus and control circuit thereof
AssigneeSilicon Works Co., Ltd.
InventorsYong Geun Kim, Sang Young Lee, Yong Goo Kim, Won Ji Lee, Young Suk Son
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Abstract
Disclosed is a light emitting diode lighting apparatus capable of improving a power factor and temperature characteristics. The light emitting diode lighting apparatus according to a preferred embodiment of the present invention includes a light source having a plurality of light emitting diode channels and performs a current regulating operation to allow a light source to emit light. The light source uses a current path provided by current regulating to emit light.
Claims11
An LED lighting apparatus comprising:
- a power supply unit configured to convert an AC voltage and provide a rectified voltage;
- a light source configured to include N light emitting diode (LED) channels (N is a natural number) including at least one LED;
- and
- a current control circuit configured to divide a varying width of the rectified voltage into N periods in response to light-emitting voltages for each LED channel, detect current flowing in the LED channels corresponding to the period, generate a plurality of reference voltages having different levels corresponding to the LED channels, reflect a variation of the rectified voltage to the plurality of the reference voltages, and control the light source to emit light by controlling amount of the current flowing in the LED channels by comparing a current detection voltage corresponding to the detected current with a reference voltage reflecting the variation of the rectified voltage.
1 more element
Dependencies are inferred from the claim text.