Semiconductor light source driving apparatus and semiconductor light source driving method

  • US 8,093,830 B2
  • Filed: 07/01/2009
  • Issued: 01/10/2012
  • Est. Priority Date: 07/03/2008
  • Status: Active Grant
First Claim
Patent Images

1. A semiconductor light source driving apparatus comprising:

  • a semiconductor light source that is driven by a current;

    a voltage source that drives the semiconductor light source;

    an output voltage controlling section that controls a drive current value for driving the semiconductor light source by controlling an output voltage of the voltage source;

    an output current detecting section that detects an output current of the semiconductor light source;

    a current command section that specifies a reference value of a drive current which is applied to the semiconductor light source;

    a current comparing section that compares the output current detected by the output current detecting section and the reference value specified by the current command section; and

    an impedance detecting section that detects an impedance of the semiconductor light source,wherein the output voltage controlling section controls the output voltage of the voltage source based on an output of the current comparing section and an output of the impedance detecting section.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×