US 8,044,603 B2Granted

Light emitting diode driving device and light system

AssigneeUPEC Electronics Corp.

InventorsHung-Chih Kuo, Huang-Chen Guo, Wen-Chang Hsiao

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Abstract

A light emitting diode driving device and light system are provided. The light emitting diode driving device drives a light source by a received alternating current voltage. The light emitting diode driving device includes a rectifier, a feedback unit, a protection unit, a switch unit, a timing unit, and a control unit. The rectifier is electrically coupled to an alternating current voltage source and the light source for providing the alternating current voltage to the light source. The feedback unit is used to detect a loading state and generate a feedback signal according the loading state for outputting the feedback signal. The protection unit is used to receive the feedback signal and compare the feedback signal with a reference voltage built in the protection unit for outputting a switch signal. The switch unit is used to receive the switch signal and connect or disconnect the alternating current voltage source and the light source. Therefore, the protection unit can avoid a burnout due to an exceeding current of the light source.

Claims43

Dependent claims

A light emitting diode driving device, the light emitting diode driving device is electrically coupled to an alternating current voltage source and a light source, wherein the alternating current voltage source outputs an alternating current voltage, the light emitting diode driving device comprising:

a rectifier electrically coupled to the alternating current voltage source and the light source to supply the alternating current voltage to the light source;
a feedback unit electrically coupled to the light source to detect a loading state of the light source for generating a feedback signal according to the loading state;
a protection unit electrically coupled to the feedback unit to receive the feedback signal for comparing the feedback signal with a reference voltage built in the protection unit and outputting a switch signal;
a switch unit having a first terminal, a second terminal and a third terminal, wherein the first terminal of the switch unit is electrically coupled to the alternating current voltage source, the second terminal of the switch unit is electrically coupled to the light source, and the third terminal of the switch unit is electrically coupled to the protection unit for receiving the switch signal to connect or disconnect between the alternating current voltage source and the light source according to the switch signal;
a timing unit electrically coupled to the alternating current voltage source to fetch the alternating current voltage and perform a synchronous operation with the alternating current voltage for outputting a timing synchronous signal;
and
a control unit electrically coupled to the timing unit and the protection unit to receive the timing synchronous signal and perform a modulation operation with the timing synchronous signal for outputting a timing modulation signal.

4 more elements

a rectifier electrically coupled to the alternating current voltage source and the light source to supply the alternating current voltage to the light source;
a feedback unit electrically coupled to the light source to detect a loading state of the light source for generating a feedback signal according to the loading state;
a protection unit electrically coupled to the feedback unit to receive the feedback signal for comparing the feedback signal with a reference voltage built in the protection unit and outputting a switch signal;
and
a switch unit having a first terminal, a second terminal and a third terminal, wherein the first terminal of the first terminal of the switch unit is electrically coupled to the alternating current voltage source, the second terminal of the switch unit is electrically coupled to the light source, and the third terminal of the switch unit is electrically coupled to the protection unit for receiving the switch signal to connect or disconnect between the alternating current voltage source and the light source according to the switch signal.

2 more elements

a rectifier electrically coupled to the alternating current voltage source and the light source to supply the alternating current voltage to the light source;
a feedback unit electrically coupled to the light source to detect a loading state of the light source for generating a feedback signal according to the loading state;
a control unit electrically coupled to the feedback unit to receive and output the feedback signal, and the control unit to compare the feedback signal with a predetermined illumination for generating a first comparing result;
a protection unit electrically coupled to the control unit to receive the feedback signal and the first comparing result, the protection unit to compare the feedback signal with a reference voltage for generating a second comparing result, the protection unit to generate and output a switch signal according to the first and second comparing result;
and
a switch unit having a first terminal, a second terminal and a third terminal, wherein the first terminal of the switch unit is electrically coupled to the alternating current voltage source, the second terminal of the switch unit is electrically coupled to the light source, and the third terminal of the switch unit is electrically coupled to the protection unit for receiving the switch signal to connect or disconnect between the alternating current voltage source and the light source according to the switch signal.

3 more elements

A lighting system, the lighting system is electrically coupled to an alternating current voltage source, wherein the alternating current voltage source outputs an alternating current voltage, the lighting system comprising:

a light source electrically coupled to the alternating current voltage source to receive the alternating current voltage;
and
a light emitting diode driving device electrically coupled to the alternating current voltage source and the light source, the light emitting diode driving device comprising:
a rectifier electrically coupled to the alternating current voltage source and the light source to supply the alternating current voltage to the light source;
a feedback unit electrically coupled to the light source to detect a loading state of the light source for generating a feedback signal according to the loading state;
a protection unit electrically coupled to the feedback unit to receive the feedback signal for comparing the feedback signal with a reference voltage built in the protection unit and outputting a switch signal;
and
a switch unit having a first terminal, a second terminal and a third terminal, wherein the first terminal of the switch unit is electrically coupled to the alternating current voltage source, the second terminal of the switch unit is electrically coupled to the light source, and the third terminal of the switch unit is electrically coupled to the protection unit for receiving the switch signal to connect or disconnect between the alternating current voltage source and the light source according to the switch signal.

5 more elements

a rectifier electrically coupled to the alternating current voltage source and the light source to supply the alternating current voltage to the light source;
a first feedback unit electrically coupled to the rectifier to detect the alternating current voltage outputted by the rectifier for generating a first feedback signal according to the alternating current voltage;
a second feedback unit electrically coupled to the light source to detect a loading state of the light source for generating a second feedback signal according to the loading state and outputting the second feedback signal;
a protection unit electrically coupled to the first feedback unit and the second feedback unit to receive the first feedback signal and the second feedback signal for comparing the first feedback signal with a first reference voltage built in the protection unit, and comparing the second feedback signal with second reference voltage built in the protection unit to output a switch signal selectively;
and
a switch unit having a first terminal, a second terminal and a third terminal, wherein the first terminal of the switch unit is electrically coupled to the alternating current voltage source, the second terminal of the switch unit is electrically coupled to the light source, and the third terminal of the switch unit is electrically coupled to the protection unit for receiving the switch signal to connect or disconnect between the alternating current voltage source and the light source according to the switch signal.

3 more elements

A lighting system electrically, the lighting system electrically is coupled to an alternating current voltage source, wherein the alternating current voltage source outputs an alternating current voltage, the lighting system comprising:

a light source electrically coupled to the alternating current voltage source to receive the alternating current voltage;
and
a light emitting diode driving device electrically coupled to the alternating current voltage source and the light source, the light emitting diode driving device comprising:
a rectifier electrically coupled to the alternating current voltage source and the light source to supply the alternating current voltage to the light source;
a first feedback unit electrically coupled to the rectifier to detect the alternating current voltage outputted by the rectifier for generating a first feedback signal according to the alternating current voltage;
a second feedback unit electrically coupled to the light source to detect a loading state of the light source for generating a second feedback signal according to the loading state;
a protection unit electrically coupled to the first feedback unit and the second feedback unit to receive the first feedback signal and the second feedback signal for comparing the first feedback signal with a first reference voltage built in the protection unit, and comparing the second feedback signal with second reference voltage built in the protection unit to output a switch signal selectively;
and
a switch unit having a first terminal, a second terminal and a third terminal, wherein the first terminal of the switch unit is electrically coupled to the alternating current voltage source, the second terminal of the switch unit is electrically coupled to the light source, and the third terminal of the switch unit is electrically coupled to the protection unit for receiving the switch signal to connect or disconnect between the alternating current voltage source and the light source according to the switch signal.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/392,434Filed 25 Feb 2009
Priority: TW 97135124 A12 Sep 2008
Published: US 2009/0153062 A118 Jun 2009
Granted: 25 Oct 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H05B 45/37
Driver circuits: converter circuits
H05B 45/375
Switched mode power supply [SMPS]: using buck topology
Y02B 20/30
Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps: semiconductor lamps, e.g. solid state lamps [SSL] light…
H05B
Electric heating