PROBLEM TO BE SOLVED: To provide a light source driving device that implements desired brightness even when the brightness of a light source is set to low brightness.SOLUTION: A light source driving device 100 includes driving means 40 for supplying a light source driving signal to a light source 11, counter electromotive force generating means 50 for generating counter electromotive force and supplying a counter electromotive signal corresponding to the counter electromotive force to the light source 11, and control means 90 for controlling the operation of the driving means 40 and the counter electromotive force generating means 50 to cause the light source 11 to emit light with a desired target luminance. Counter electromotive force consumption means 60 for consuming the counter electromotive force under the control of the control means 90 is provided. When the target luminance is smaller than a predetermined threshold value, the control means 90 activates the counter electromotive force consuming means 60 to drive the light source 11 based on the light source driving signal. When the target luminance is not less than the predetermined threshold value, the light source 11 is driven based on the light source driving signal and the counter electromotive signal without activating the counter electromotive force consuming means 60.SELECTED DRAWING: Figure 3
【課題】光源の輝度を低輝度とする場合においても所望の輝度を実現する。【解決手段】光源駆動装置100は、光源11に光源駆動信号を供給する駆動手段40と、逆起電力を発生させ、逆起電力に応じた逆起信号を光源11に供給する逆起電力発生手段50と、駆動手段40と逆起電力発生手段50との動作を制御し、所望の目標輝度で光源11を発光させる制御手段90と、を備える。制御手段90の制御に基づいて逆起電力を消費する逆起電力消費手段60を設け、制御手段90は、目標輝度が所定の閾値よりも小さい場合には、逆起電力消費手段60を作動させて、光源駆動信号によって光源11を駆動し、目標輝度が所定の閾値以上の場合には、逆起電力消費手段60を作動させずに、光源駆動信号及び逆起信号によって光源11を駆動する。【選択図】図3
LIGHT SOURCE DRIVING DEVICE
光源駆動装置
2017-04-20
Patent
Electronic Resource
Japanese
IPC: | H01L Halbleiterbauelemente , SEMICONDUCTOR DEVICES / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein |
LIGHT SOURCE DRIVING CIRCUIT AND LIGHT SOURCE DRIVING METHOD
European Patent Office | 2019
|LIGHT SOURCE DEVICE AND METHOD FOR DRIVING LIGHT SOURCE DEVICE
European Patent Office | 2019
|LIGHT SOURCE-DRIVING CIRCUIT AND METHOD FOR DRIVING LIGHT SOURCE
European Patent Office | 2018
|