Led dimmer, led lighting device comprising same, and method for controlling dimming of led lighting device
AssigneeSeoul Semiconductor Co., Ltd.
InventorsHye Man Jung, Hyun Gu Kang, Jin Cheol Shin, Sang Wook Han
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Abstract
A light-emitting diode (LED) dimmer for an LED lighting device, including a power switch, a drive voltage supply, and a LED light-emitting unit. Operating zones of the LED lighting device are changed in accordance with the switching of the power switch, and a dimming level for a next operating zone is determined on the basis of the dimming level and time while the power switch was on during the previous operating period.
Claims19
A light-emitting diode (LED) dimmer for an LED lighting device, comprising:
- a power switch;
- a drive voltage supply;
- and
- an LED light-emitting unit,
- wherein, when operating zones of the LED lighting device are changed due to switching the power switch;
- the LED dimmer is configured to select a first dimming level of a (k+1)th operating zone after switching the power switch, k being a positive integer;
- the first dimming level being different than a second dimming level of a kth operating zone before switching the power switch;
- and
- the LED dimmer is configured to control luminance of the LED light-emitting unit according to the second dimming level in the kth operating zone.
A light-emitting diode (LED) lighting device, comprising:
- a power switch connected between an AC power source and a rectification unit, the power switch configured to selectively output AC voltage supplied from the AC power source;
- a drive voltage supply connected to the power switch, the drive voltage supply configured to generate a drive voltage through treatment of the AC voltage output through the power switch, and output the drive voltage to an LED light-emitting unit and an LED dimmer;
- wherein;
- the LED dimmer is configured to select a first dimming level of a (k+1)th operating zone after switching the power switch, k being a positive integer;
- the first dimming level being different than a second dimming level of a kth operating zone before switching the power switch;
- the LED dimmer is configured to control luminance of the LED light-emitting unit according to the second dimming level in the kth operating zone, when operating zones of the LED lighting device are changed due to switching the power switch;
- and
- the LED light-emitting unit is configured to emit light under control of the LED dimmer.
A control method for dimming control of a light-emitting diode (LED) light emitting device, comprising:
- a power switch;
- a drive voltage supply;
- an LED dimmer;
- and
- an LED light-emitting unit, the method comprising:
- (a) determining whether the power switch is turned on;
- (b) when the power switch is turned on, reading a target dimming level and starting control of luminance of the LED light-emitting unit according to the target dimming level to start a kth operating zone, k being a positive integer;
- (c) changing the target dimming level to a second dimming level next to the target dimming level, immediately after starting control of luminance of the LED light-emitting unit;
- and
- (d) determining whether the power switch is turned off, and finishing the kth operating zone when the power switch is turned off,
- wherein the target dimming level changed and set as the second dimming level in Step (c) becomes a target dimming level in a (k+1)th operating zone.
Dependencies are inferred from the claim text.