| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform derating without raising cost. <P>SOLUTION: A control device of a lighting fixture for vehicle includes an inversion type converter 2 which receives an on off signal from a current control unit 4 and supplies a negative polarity output to LEDs 21-1 to 21-n, a current detector 3 for detecting LED drive current I<SB>L</SB>flowing through the LEDs 21-1 to 21-n, a derating signal generation unit 5 for sending a derating signal I<SB>d</SB>, and a derating control unit 6 for inputting light source drive voltage in an output side of the current detector 3 to a negative input and inputting derating voltage Vr to a positive input, comparing the light source drive voltage with the derating voltage Vr, and sending a derating control signal having a fixed capacity to the current control unit 4. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
