×

LIGHTING SYSTEM, ELECTRONIC DEVICE FOR A LIGHTING SYSTEM AND METHOD FOR OPERATING THE ELECTRONIC DEVICE

  • US 20120187857A1
  • Filed: 01/05/2012
  • Published: 07/26/2012
  • Est. Priority Date: 01/06/2011
  • Status: Active Grant
First Claim
Patent Images

1. An electronic device for a lighting system, wherein the lighting system comprises a TRIAC dimmer and is configured to receive a mains supply voltage and to provide a phase cut voltage to the electronic device, wherein the electronic device comprises:

  • a control loop that is configured to control a duty cycle of a switched voltage converter that receives a rectified phase cut voltage as an input voltage and provides a drive current to a light emitting semiconductor device,the control loop comprises an error amplifier that is coupled to receive a sense voltage that is indicative to a current through the light emitting semiconductor device,the error amplifier being configured to provide a feedback signal to a pulse width modulation logic that is configured to control the duty cycle of the switched voltage converter so as to provide a constant drive current to the light emitting semiconductor device in response to the sense voltage andthe error amplifier being coupled to receive a reference voltage that is a function of the input voltage.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×