Apparatus for operating at least one light-emitting diode

• US 6,380,693 B1
• Filed: 08/09/2000
• Issued: 04/30/2002
• Est. Priority Date: 08/11/1999
• Status: Expired due to Fees

• Current Assignee: Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen MbH (Siemens AG)
• Original Assignee: Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen MbH (Siemens AG)
• Inventors: Kastl, Roland
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Vu, Jimmy T.
• Application Number:
  US09/635,210
• Time in Patent Office: 629 Days
• Field of Search: 315/56, 315/200.R, 315/209.R, 315/208, 315/291, 315/294
• US Class Current: 315/209.00R
• CPC Class Codes: H05B 39/045 with high-frequency bridge converters H05B39/048 takes precedence
• CPC Class Codes: H05B 45/382 with galvanic isolation between input and output
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

The invention relates to an apparatus for operating at least one light-emitting diode (LD) comprising an electronic transformer (10), the output of the electronic transformer (10) having a high-frequency rectifier (12) connected to it whose output is connected to at least one light-emitting diode (LD), the high-frequency rectifier (12) and the at least one light-emitting diode (LD) being combined to form a separate physical unit (14).

Claims

1. An apparatus for operating a halogen lamp and a light emitting diode (LED), the apparatus comprising:

a transformer that receives an input voltage and provides a high frequency output voltage;

a halogen lamp connected to said transformer and that receives and is operated by the high frequency output voltage;

a rectifier connected to said transformer and that receives the high frequency output voltage and provides a DC output; and

an LED connected to said rectifier and that receives and is operated by the DC output, said rectifier and said LED being housed together and spaced from said transformer and said halogen lamp.

2. The apparatus as claimed in claim 1, wherein the rectifier is a half-wave or a full-wave high-frequency rectifier.

3. The apparatus as claimed in claim 1, wherein the rectifier comprises a smoothing circuit.

4. The apparatus as claimed in claim 1, wherein at least one nonreactive series resistor is arranged at the output of the rectifier for current limiting purposes.

5. The apparatus as claimed in claim 1, wherein at least one impedance is arranged at the output of the transformer for current limiting purposes.

6. The apparatus as claimed in claim 5, wherein the impedance is realized by the rectifier.

7. The apparatus of claim 1, wherein said rectifier and said LED are on a same circuit board and wherein said circuit board is spaced from said transformer and said halogen lamp.

8. The apparatus of claim 1, further comprising a light emitting housing in which said LED and said rectifier are housed, said halogen lamp and said transformer being outside and spaced from said housing.

9. The apparatus of claim 1, wherein the high frequency output voltage has a frequency of 35 kHz to 200 kHz.

10. An apparatus for simultaneously operating a halogen lamp and a light emitting diode (LED), the apparatus comprising:

a transformer that receives a mains input voltage and provides an output voltage having a frequency of 35 kHz to 200 kHz;

a halogen lamp connected to said transformer and that receives and is operated by the 35 kHz to 200 kHz output voltage;

a high frequency rectifier connected to said transformer and that receives the 35 kHz to 200 kHz output voltage and provides a DC output;

an LED connected to said rectifier and that receives and is operated by the DC output;

a circuit board on which said high frequency rectifier and said LED are mounted; and

a light emitting housing in which said LED and said rectifier are housed, said halogen lamp and said transformer being outside and spaced from said housing.