The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 10, 2012
Filed:
Jul. 01, 2009
Shuji Inoue, Okayama, JP;
Shuji Inoue, Okayama, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The semiconductor light source driving apparatus has: a semiconductor light source that is driven by a current; a voltage source that drives the semiconductor light source; an output voltage controlling circuit 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 circuit that detects an output current of the semiconductor light source; a current command circuit that specifies a reference value of a drive current which is applied to the semiconductor light source; a current comparing circuit that compares the output current detected by the output current detecting circuit and the reference value specified by the current command section; and an impedance detecting circuit that detects an impedance of the semiconductor light source. The output voltage controlling circuit controls the output voltage of the voltage source based on an output of the current comparing circuit and an output of the impedance detecting circuit.