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Luminous element driving circuit and lamp for vehicle

一种发光元件、驱动电路的技术，应用在电路、车头灯、电气元件等方向，能够解决亮度恶化、温度升高、半导体发光元件寿命缩短等问题，达到减少制约的效果

Inactive Publication Date: 2008-07-02
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the temperature of lamps for vehicles sometimes increases due to atmospheric temperature or sunlight environment, radiant heat from the engine room, etc., and for semiconductor light emitting elements, if their own temperature exceeds the maximum rated temperature, the brightness will deteriorate rapidly
In other words, the lifetime of semiconductor light-emitting elements will be shortened

Method used

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  • Luminous element driving circuit and lamp for vehicle
  • Luminous element driving circuit and lamp for vehicle
  • Luminous element driving circuit and lamp for vehicle

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Embodiment Construction

[0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Moreover, in each drawing, the same code|symbol is attached|subjected to the same or corresponding part.

[0024] FIG. 1 is a cross-sectional view showing a vehicle lamp 1 according to an embodiment of the present invention. The vehicle lamp 1 shown in FIG. 1 is a lamp mainly used for vehicle headlights, etc., and has: a light emitting element 3; a housing 110 that accommodates a light emitting element drive circuit according to an embodiment of the present invention; a bracket 120; heat sink 130 ; reflector 140 ; ​​lens 150 ; lamp body 160 ; and front cover 170 .

[0025] The light emitting element 3 is a semiconductor light emitting element such as LED or LD. The light-emitting element 3 is supported by a bracket 120 , and a cooling fin 130 for heat dissipation is arranged on the bracket 120 . The light emitting element 3 outputs light from the li...

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Abstract

A light emitting device drive circuit includes: a power conversion unit for receiving an input electric power and performing an electric power conversion on the input electric power in accordance with a control signal so as to generate the predetermined output current; a current detection unit for detecting an output current IL of the power conversion unit; a temperature detection unit for detecting a case internal temperature TD, which is an interior temperature of a case for accommodating the light emitting device drive circuit; a regulation unit being operable to a) detect whether a temperature TL of the light emitting device has reached a first predetermined temperature TLmax based on TD, IL, and a temperature rise coefficient α relative to IL, the temperature rise coefficient α being set in advance so that TL satisfies a relationship of TL=TD+α·IL, and b) generate a regulation signal for reducing a predetermined output current IL0 so that TL does not exceed TLmax in the event that a result of the detection indicates that TL has reached TLmax; and a control unit for controlling IL0 in accordance with the regulation signal from the regulation unit.

Description

technical field [0001] The present invention relates to a drive circuit for driving a light emitting element and a vehicle lamp having the light emitting element drive circuit. Background technique [0002] In recent years, semiconductor light emitting elements such as LEDs and LDs have been used as light sources for vehicle lamps. In order to drive the semiconductor light emitting element, the vehicle lamp has a drive circuit for supplying a stable current to the semiconductor light emitting element. [0003] However, the temperature of lamps for vehicles sometimes increases due to atmospheric temperature, sunlight environment, radiant heat from the engine room, etc., and semiconductor light emitting elements, if their own temperature exceeds the maximum rated temperature, the brightness will deteriorate rapidly. In other words, the lifetime of the semiconductor light emitting element will be shortened. In this regard, the drive circuit described in Patent Document 1 dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60Q1/04H01L33/00H05B37/02
CPCH05B33/08H05B45/18B60Q11/005B60Q2300/146F21S41/141H05B45/00
Inventor 伊藤昌康内山义浩难波高范
Owner KOITO MFG CO LTD