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Dim the Lights

Patent

EP2206416

Owner

OSRAM GmbH

Filing Date

October 31, 2007

Priority Date

October 31, 2007

Portfolio

Lighting - OSRAM

Intro

Read about this way of dimming lights by directly interfering with the main power supply. 
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Claims

1. A system for feeding electrical power to a light source (L) via a bridge arrangement (10), said system having an input filter (14) for connection t...
  1. A system for feeding electrical power to a light source (L) via a bridge arrangement (10), said system having an input filter (14) for connection to a dimmer (12), said input filter (14) has a Greek-pi configuration, including an output capacitor (C2), the system including a switch (S1) sensitive (16, SB) to the load on said bridge arrangement (10), characterized in that the system includes a resistor (R1) selectively coupleable to said output capacitor (C2) via said switch, whereby said resistor (R1) is coupleable to said input filter (14) to form a snubber circuit to prevent oscillations of said input filter (14) and said bridge arrangement (10) by selectively coupling said resistor (R1) to said output capacitor (C2) when the load on said bridge arrangement (10) is below a given threshold.
  2. The system of claim 1, including said switch (S1) configured to disconnect said resistor (R1) from said input circuit filter (14) when said load on said bridge arrangement (10) is above a respective threshold.
  3. The system of claim 2, including said switch (S1) configured to couple and disconnect said resistor (R1) to and from said input filter (14) when the load on said bridge arrangement (10) is below and above, respectively, said given threshold.
  4. The system of claim 2, including said switch (S1) configured to couple said resistor (R1) to said input filter (14) when the load on said bridge arrangement (10) is below a first threshold and to disconnect said resistor (R1) from said input filter (14) when the load on said bridge arrangement (10) is above a second threshold higher than said first threshold.
  5. The system of claim 4, including said switch (S1) configured to partially couple said resistor (R1) to said input filter (14) when the load on said bridge arrangement (10) lies between said first and second threshold.
  6. The system of any of the previous claims, including said switch (S1) to connect said resistor (R1) in series to said output capacitor (C2).
  7. The system of any of the previous claims, wherein said switch (S1) is an electronic switch.
  8. The system of claim 7, wherein said switch (S1) is a bipolar switch.
  9. The system of claim 8, wherein said switch (81) includes two opposite-polarity transistors (100, 102).
  10. The system of claim 8, wherein said switch (S1) includes a single transistor (102) including a body diode, wherein the bipolar nature of said switch is provided by said transistor (102) and the body diode thereof.
  11. The system of any of the previous claims, including control circuitry (SB) for said switch (S1), said control circuitry with at least one threshold detector (104, 108, 112; 106, 110, 114) sensitive to a signal (16) representative of the load on said bridge arrangement (10).
  12. The system of claim 11, wherein said at least one threshold detector (104, 108, 112; 106, 110, 114) includes a zener diode (108, 110) wherein the zener voltage of said zener diode (108, 110) defines a switching point for said switch (S1).
  13. The system of any of the previous claims, including control circuitry (SB) for said switch (S1), said control circuitry (SB) coupled to a voltage divider (R3, R4) sensitive to the load on said bridge arrangement (10), wherein the partition point of said voltage divider (R3, R4) defines a switching point for said switch (S1).
  14. The system of any of the previous claims, wherein said dimmer is a leading edge dimmer (12).
  15. A method of feeding electrical power to a light source (L) via a bridge arrangement (10) and via an input filter (14) for connection to a dimmer (12), said input filter (14) has a Greek-pi configuration, including an output capacitor (C2), the method including the steps of sensing the load on said bridge arrangement (10), characterized in thata resistor (R1) is provided coupleable to said output capacitor (C2) via said switch, to form a snubber circuit to prevent oscillations of said input filter (14) and said bridge arrangement (10) by selectively (S1) coupling said resistor (R1) to said output capacitor (C2) when the load of said bridge arrangement (10) is below a given threshold.
  16. The method of claim 15, including the step of disconnecting said resistor (R1) from said input circuit filter (14) when said load on said bridge arrangement (10) is above a respective threshold.
  17. The method of claim 16, including the steps of coupling and disconnecting said resistor (R1) to and from said input filter (14) when the load on said bridge arrangement (10) is below and above, respectively, said given threshold.
  18. The method of claim 16, including the steps of coupling said resistor (R1) to said input filter (14) when the load on said bridge arrangement (10) is below a first threshold and disconnecting said resistor (R1) from said input filter (14) when the load on said bridge arrangement (10) is above a second threshold higher than said first threshold.
  19. The method of claim 18, including the step of partially coupling said resistor (R1) to said input filter (14) when the load on said bridge arrangement (10) lies between said first and second threshold.
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Abstract

No Abstract.


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