Lighting control device of lighting device for vehicle

A control device and lighting technology, applied in lighting devices, electric lamp circuit layout, light source and other directions, can solve problems such as color shift, and achieve the effects of preventing failures, suppressing flickering of light, and suppressing up and down oscillations

Inactive Publication Date: 2013-01-23
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the DC current is reduced, there will be a problem of color shift (non-white)

Method used

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  • Lighting control device of lighting device for vehicle
  • Lighting control device of lighting device for vehicle
  • Lighting control device of lighting device for vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] Below, refer to Figure 1 ~ Figure 3 A lighting control device for a vehicle lamp according to a first embodiment of the present invention will be described.

[0035] like figure 1 As shown, the lighting control device 1 includes: a switching regulator 2 that supplies a driving current (hereinafter referred to as 'LED current') to an LED (not shown); and receives a PWM dimming signal S as a dimming control signal. P (refer to figure 2 ) and control the dimming of the LED, so that the average current of the LED current is reduced as the control unit 3 of the control component; and the drive control signal S C output to the drive circuit 5 of the switching regulator 2.

[0036] The control unit 3 has: a current detection unit 4 that detects the LED current; and compares the current value of the LED current with a prescribed reference voltage, and feedback-controls the output of the switching regulator 2 so that the current value of the LED current is equal to the refe...

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PUM

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Abstract

A lighting control device of a lighting device for a vehicle includes a switching regulator for supplying a driving current to a semiconductor light source. The lighting control device also includes control means having a current detecting portion for detecting the driving current and serving to control dimming of the semiconductor light source in order to reduce a mean current of the driving current by repeating driving and stopping operations of the switching regulator at a high speed upon receipt of a dimming control signal. The current detecting portion has a current holding portion for holding the driving current, detected for a driving period of the switching regulator, for a stopping period after a passage of the driving period.

Description

technical field [0001] The present invention relates to a lighting control device for a vehicle lamp, and relates to a lighting control device for a vehicle lamp that controls lighting of a semiconductor light source composed of a semiconductor light emitting element. Background technique [0002] Conventionally, as a vehicle lamp, it is known to use a semiconductor light emitting element such as a light emitting diode (LED: Light Emitting Diode) as a semiconductor light source, and such a vehicle lamp is equipped with a lighting control system for controlling the lighting of the LED. device. [0003] The above-mentioned lighting control device has a switching regulator (switching regulator) that supplies a driving current to the LED and a control unit that includes a current detection unit that detects the driving current therein. The operation of driving and stopping is repeatedly performed at high speed by turning on and off the supplied voltage, thereby controlling dimm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCH05B33/0818H05B45/3725
Inventor 笠羽佑介伊藤昌康
Owner KOITO MFG CO LTD
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