LIGHT EMITTING APPARATUS

• US 20130313986A1
• Filed: 05/22/2013
• Published: 11/28/2013
• Est. Priority Date: 05/22/2012
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Je Won, KIM, Sung Tae, LIM, Chan Mook
• Application Number:
  US13/900,288
• Publication Number:
  US 20130313986A1
• Time in Patent Office: Days
• US Class Current: 315/192
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/37 Converter circuits

Abstract

A light emitting apparatus includes a power supply providing power having a predetermined frequency, a plurality of light emitting diode arrays, and at least one frequency converter. The light emitting diode arrays are electrically connected to the power supply and respectively have an array structure in which at least one or more light emitting diodes are connected to one another in series. The at least one frequency converter is connected to both ends of the power supply, and configured to modulate a frequency of the power provided from the power supply and provide a modulated electrical signal to at least one of the plurality of light emitting diode arrays.

Claims

1. A light emitting apparatus, comprising:

a power supply providing power having a predetermined frequency;

a plurality of light emitting diode arrays electrically connected to the power supply and respectively having an array structure in which at least one or more light emitting diodes are connected to one another in series; and

at least one frequency converter connected to both ends of the power supply, and configured to modulate a frequency of the power provided from the power supply and provide a modulated electrical signal to at least one of the plurality of light emitting diode arrays.

2. The light emitting apparatus of claim 1, wherein:

the at least one frequency converter are a plurality of frequency converters, and

at least two of the plurality of light emitting diode arrays respectively receive the modulated electrical signal from at least two of the plurality of frequency converters, such that amounts of frequency modulation of the at least two frequency converters are different from each other.

3. The light emitting apparatus of claim 2, wherein the amounts of frequency modulation of the at least two frequency converters are set to increase the frequency of power provided from the power supply.

4. The light emitting apparatus of claim 2, wherein the amounts of frequency modulation of the at least two frequency converters are set to decrease the frequency of power provided from the power supply.

5. The light emitting apparatus of claim 2, wherein:

at least one of the at least two frequency converters is set to increase the frequency of power provided from the power supply, and

the remaining one of the at least two frequency converters is set to decrease the frequency of power provided from the power supply.

6. The light emitting apparatus of claim 1, wherein at least one of the plurality of light emitting diode arrays further includes a resistor connected to the at least one light emitting diode array in series, such that the resistor controls an amount of current conducting the at least one light emitting diode array.

7. The light emitting apparatus of claim 6, wherein a resistance value of the resistor is set such that a frequency of power conducting the light emitting diode array including the resistor is not higher than a frequency of power conducting a different light emitting diode array.

8. The light emitting apparatus of claim 6, wherein a resistance value of the resistor is set such that a frequency of power conducting the light emitting diode array including the resistor is not lower than a frequency of power conducting a different light emitting diode array.

9. The light emitting apparatus of claim 1, wherein the power supply includes an alternating current power source having a predetermined frequency and a rectifier connected to both ends of the alternating current power source to rectify alternating current power to provide the rectified alternating current power.

10. The light emitting apparatus of claim 9, wherein:

at least one of the plurality of light emitting diode arrays further includes a subarray connected to the at least one light emitting diode array in parallel, and

the subarray has an array structure in which at least one or more light emitting diodes are connected in series.

11. The light emitting apparatus of claim 1, wherein:

at least one of the plurality of light emitting diode arrays further includes a subarray connected to the at least one light emitting diode array in parallel, and

the subarray has an array structure in which at least one or more light emitting diodes are connected in series, and has a reverse polarity with respect to a polarity of the at least one light emitting diode array.

12. A light emitting apparatus, comprising:

a power supply providing power having a predetermined frequency;

a plurality of light emitting diode arrays respectively having an array structure in which at least one or more light emitting diodes are connected to one another in series; and

a plurality of frequency converters connected to both ends of the power supply and configured to modulate a frequency of the power provided from the power supply and provide modulated electrical signals to respective ones of the plurality of light emitting diode arrays such that frequencies of the modulated electrical signals are different from one another.

13. The light emitting apparatus of claim 12, wherein amounts of frequency modulation of the plurality of frequency converters are set to increase the frequency of power provided from the power supply.

14. The light emitting apparatus of claim 12, wherein amounts of frequency modulation of the plurality of frequency converters are set to decrease the frequency of power provided from the power supply.

15. The light emitting apparatus of claim 12, wherein:

at least one of the plurality of frequency converters is set to increase the frequency of power provided from the power supply, and

the remaining ones of the plurality of frequency converters are set to decrease the frequency of power provided from the power supply.

16. The light emitting apparatus of claim 12, wherein at least one of the plurality of light emitting diode arrays further includes a resistor connected to the at least one light emitting diode array in series, such that the resistor controls an amount of current conducting the at least one light emitting diode array.

17. The light emitting apparatus of claim 16, wherein a resistance value of the resistor is set such that a frequency of power conducting the light emitting diode array including the resistor is not higher than a frequency of power conducting a different light emitting diode array.

18. The light emitting apparatus of claim 16, wherein a resistance value of the resistor is set such that a frequency of power conducting the light emitting diode array including the resistor is not lower than a frequency of power conducting a different light emitting diode array.

19. The light emitting apparatus of claim 12, wherein the power supply includes an alternating current power source having a predetermined frequency and a rectifier connected to both ends of the alternating current power source to rectify alternating current power to provide the rectified alternating current power.

20. The light emitting apparatus of claim 12, wherein:

at least one of the plurality of light emitting diode arrays further includes a subarray connected to the at least one light emitting diode array in parallel, and

the subarray has an array structure in which at least one or more light emitting diodes are connected in series, and has a reverse polarity with respect to a polarity of the at least one light emitting diode array.