| 摘要 |
PROBLEM TO BE SOLVED: To suppress an overcurrent supplied to a light source.SOLUTION: An OCP circuit 30 is inserted between a drive circuit 20 and a light source 2, and restricts a lamp current Iflowing into the light source 2 so that the lamp current does not exceed an overcurrent threshold value I. A transistor M31, an inductor L31, and a rectifier D31 are disposed in a T-shape. A current sensor 32 generates a current detection signal Iaccording to the lamp current I. An OCP controller 34 controls ON/OFF of the transistor M31 on the basis of the current detection signal Iand the overcurrent threshold value I.SELECTED DRAWING: Figure 3 |
