Control circuit of light-emitting diode lighting apparatus
AssigneeSilicon Works Co., Ltd.
InventorsKyung Min KIM, Yong Goo KIM, Won Ji LEE, Jong Min LEE, Young Suk SON
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Abstract
Disclosed is a control circuit of an LED lighting apparatus having a dimming function. The control circuit provides a current path corresponding to light emitting states of LED channels in response to a rectified voltage, and performs dimming by controlling a current amount of the current path in response to a dimming control signal provided as an analog signal or digital signal.
Claims20
A control circuit of an LED lighting apparatus which is divided into a plurality of LED channels, the control circuit comprising a control unit provides a current path corresponding to turn-on states of the LED channels in response to a rectified voltage, generates a control pulse corresponding to an external dimming control signal therein, and controls a current amount of the current path according to the control pulse.
A control circuit of an LED lighting apparatus which is divided into a plurality of LED channels, the control circuit comprising a control unit provides a current path corresponding to turn-on states of the LED channels in response to a rectified voltage, and controls a current amount of the current path in response to a level of an external dimming control signal.
A control circuit of an LED lighting apparatus which sequentially turns on a plurality of LED channels included in a lamp in response to a rectified voltage, the control circuit comprising:
- a control unit comprising a plurality of switching circuits provided for the respective LED channels and provides a selective current path corresponding to sequential light emissions of the lamp;
- and
- a current sensing unit commonly connected to the switching circuits so as to form the current path, and provides the current sensing voltage,
- wherein each of one or more of the switching circuits comprises a comparator compares the current sensing voltage to a reference voltage provided in response to the LED channel and an external switching element switched by an output of the comparator so as to form the current path and provided outside of a chip having the control unit mounted therein.
Dependencies are inferred from the claim text.