車両用灯具の点灯制御装置 - Koito Manufacturing Co., Ltd.

Title:

車両用灯具の点灯制御装置

Document Type and Number:

Japanese Patent JP5006180

Kind Code:

B2

Abstract:

A lighting controller of a lighting device for a vehicle includes M (M is an integer of one or more) switching regulators for supplying driving currents to first to Nth (N is an integer of one or more) semiconductor light sources; first to Nth current driving portions; a temperature detector; and a control circuit. The first to Nth current driving portions include first to Nth current detecting portions connected to the semiconductor light sources and serving to detect the driving currents respectively; and first to Nth switching portions connected to the semiconductor light sources respectively. The first to Nth current driving portions operates the switching portions corresponding to magnitudes of the driving currents detected by the current detecting portions respectively. The temperature detector detects a temperature and sends a temperature detecting signal when the detected temperature is equal to or higher than a pre-specified temperature. The control circuit controls the current driving means in order to decrease the driving currents to be supplied to the semiconductor light sources upon receipt of the temperature detecting signal. The control circuit sets a priority of each of the semiconductor light sources for decreasing the driving current and decreases the driving current in order from the semiconductor light source having a highest priority.

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Inventors:

Takayoshi Kitagawa
Noriyuki Nakamura
Masayasu Ito

Application Number:

JP2007336070A

Publication Date:

August 22, 2012

Filing Date:

December 27, 2007

Export Citation:

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