In connection with a ground transportation vehicle light head (86) powered by a battery-based voltage source (20) supplying positive (76) and reference (i.e., ground) (78) voltages that define a voltage difference (22) applied across a number of multiple series-connected high-power light-emitting diodes (HP LEDs) (12) and current regulator circuitry (80) electrically connected to them, ultra-low dropout circuit techniques are disclosed for increasing a portion of the voltage difference available from the battery-based voltage source to forward bias and thereby maximize the number of the multiple series-connected HP LEDs emitting light by maintaining a low voltage drop (82) across the current regulator circuitry. By maintaining the low voltage drop and making available from the battery-based voltage source an increased portion of the voltage difference, at least one additional HP LED is capable of being forward biased to thereby maximize the number of multiple series-connected HP LEDs emitting light from the light head.


    Access

    Download


    Export, share and cite



    Title :

    Low-dropout current regulator for light head


    Contributors:

    Publication date :

    2020-01-28


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    H05B ELECTRIC HEATING , Elektrische Heizung / 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 / G05F SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES , Systeme zum Regeln elektrischer oder magnetischer Veränderlicher



    LOW-DROPOUT CURRENT REGULATOR FOR LIGHT HEAD

    BROWER RICHARD NELSON | European Patent Office | 2019

    Free access

    Radiation tolerant very low voltage dropout regulator

    DiBugnara, R. / Hu, Weiping | Tema Archive | 2000


    Radiation Tolerant Very Low Voltage Dropout Regulator - European Space Component Initiatives

    DiBugnara, R. / Hu, W. / European Space Agency | British Library Conference Proceedings | 2000


    A Loop Compensation Method of Low Dropout Regulator with Ultra Low Power

    Liu, Chen / Lai, Xinquan / Zhong, Longjie et al. | British Library Online Contents | 2016


    Dropout assembly

    MADHAVEN SRIDHARAN | European Patent Office | 2020

    Free access