×

LIGHTING DEVICE FOR SOLID-STATE LIGHT SOURCE AND ILLUMINATION APPARATUS INCLUDING SAME

  • US 20120262087A1
  • Filed: 04/13/2012
  • Published: 10/18/2012
  • Est. Priority Date: 04/13/2011
  • Status: Active Grant
First Claim
Patent Images

1. A lighting device for a solid-state light source, comprising:

  • a DC power source circuit section which performs power conversion of a power of a DC input power source by using an inductor connected in series to a switching element, and flows a current in a solid-state light source by using a charging/discharging current or either one of charging and discharging currents of the inductor; and

    a current control section which controls the switching element to control a current flowing through the solid-state light source for controlling a dimming level of the solid-state light source,wherein the current control section includes a first switching control unit for changing an ON width of the switching element depending on the dimming level; and

    a second switching control unit for controlling an ON timing of the switching element, andwherein the second switching control unit changes a time until the switching element is turned on from a zero-crossing of the discharging current of the inductor such that the time becomes substantially the same when the dimming level is equal to or greater than a predetermined level, and the time becomes longer when the dimming level is less than the predetermined level.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×