US 2018/0324911 A1Published application

Light emitting diode driving apparatus and signal-adjusting module thereof

AssigneeSemisilicon Technology Corp.

InventorWen-Chi PENG

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Abstract

A signal-adjusting module applied to a light emitting diode driving apparatus includes an input terminal, an output terminal, a switch-control unit, and a switch. The switch-control unit is electrically connected to the input terminal for receiving an illuminant-control signal, and the switch is electrically connected to the input terminal, the output terminal, and the switch-control unit. The switch-control unit is configured to turn on the switch when a level of the illuminant-control signal reaches a first threshold level and turn off the switch when the level of the illuminant-control signal reaches a second threshold level, thus a transition time of the illuminant-control signal transits from an upper limit level to a lower limit level is decreased.

Claims17

Dependent claims

A signal-adjusting module, applied to a light emitting diode driving apparatus and electrically connected to a control circuit for generating an illuminant-control signal, the signal-adjusting module comprising:

an input terminal electrically connected to the control circuit;
an output terminal electrically connected to light emitting diode driving apparatus;
a switch-control unit comprising a level-comparing unit electrically connected to the input terminal for receiving the illuminant-control signal and having a first threshold level and a second threshold level, wherein the illuminant-control signal is a pulse-width-modulation signal transiting from a first limit level to a second limit level;
and
a switch electrically connected to the input terminal, the output terminal, and the switch-control unit,
wherein the level-comparing unit is configured to compare a level of the illuminant-control signal with the first threshold level and generate a first signal as a basis for turning on the switch when the level of the illuminant-control signal reaches the first threshold level, and
wherein the level-comparing unit is configured to generate a second signal as a basis for turn off the switch after passing a time interval when generating the first signal.

4 more elements

A light emitting diode driving apparatus, receiving an illuminant-control signal transiting from a first limit level to a second limit level and configured to vary color of a plurality of light emitting diode strings, the light emitting diode driving apparatus comprising:

a signal-adjusting module comprising:
an input terminal for receiving the illuminant-control signal;
an output terminal;
a switch-control unit comprising a level-comparing unit electrically connected to the input terminal and having a first threshold level and a second threshold level, wherein the switch-control unit receives the illuminant-control signal and configured to determine a level of the illuminant-control signal;
and
a switch electrically connected to the input terminal, the output terminal, and the switch-control unit, wherein the switch-control unit is configured to compare the level of the illuminant-control signal with the first threshold level and generate a first signal as a basis for turning on the switch when the level of the illuminant-control signal reaches the first threshold level, and the switch-control unit is further configured to compare the level of the illuminant-control signal with the second threshold level and generate a second signal as a basis for turning off the switch after passing a time interval when generating the first signal;
a voltage regulator electrically connected to the input terminal and the output terminal;
and
a driving module electrically connected to the signal-adjusting module and the light emitting diode strings.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/584,716Filed 2 May 2017
Published: 8 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H05B 45/20
Circuit arrangements for operating light-emitting diodes [LED]: controlling the colour of the light
H05B 45/48
With an active control inside an LED matrix: having LEDs organised in strings and incorporating parallel shunting devices
H05B 47/11
In response to determined parameters: by determining the brightness or colour temperature of ambient light
Y02B 20/40
Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps: control techniques providing energy savings, e.g. smart…

Family

US 10,123,383 B1Related patent
US 2018/0324911 A1This patent

From the US filing history. Foreign family members aren’t listed.

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