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    SINGLE-SEGMENT LINEAR CONSTANT-POWER LED DRIVING CIRCUIT AND METHOD
    2.
    发明申请
    SINGLE-SEGMENT LINEAR CONSTANT-POWER LED DRIVING CIRCUIT AND METHOD 审中-公开

    公开(公告)号：US20190124735A1

    公开(公告)日：2019-04-25

    申请号：US15755020

    申请日：2016-12-30

    Applicant: CHINA RESOURCES POWTECH (SHANGHAI) CO., LTD.

    Inventor： JUN LIU ,  QUANQING WU ,  GUOCHENG LI

    IPC: H05B33/08

    CPC classification number: H05B33/0815 ,  H05B33/0812 ,  H05B33/0848 ,  H05B33/089

    Abstract: A single-segment linear constant-power LED driving circuit and method. The circuit comprises: a voltage input module, an LED load, a power switch tube, a sampling resistor, an over-voltage control module for detecting the voltage at a drain terminal of the power switch tube, a current control module for limiting a peak current of the LED load, and a comparison module. When an input voltage is greater than a turn-on voltage of the LED load, the current control module limits the peak current so that the current average value in different input voltage periods is constant. When the input voltage is greater than a set value, current flowing through the LED load is turned off, thereby reducing power consumption. When the input voltage is less than the turn-on voltage of the LED load, the LED load is turned off.

    PROGRAMMABLE LED DRIVER
    6.
    发明申请
    PROGRAMMABLE LED DRIVER 审中-公开

    公开(公告)号：US20180255614A1

    公开(公告)日：2018-09-06

    申请号：US15759862

    申请日：2016-09-27

    Applicant: KELSEY-HAYES COMPANY

    Inventor： Jeffrey A. Sewell

    IPC: H05B33/08

    CPC classification number: H05B33/0815 ,  B60Q3/18 ,  B60Q3/80 ,  H05B33/0848 ,  H05B33/089 ,  H05B33/0893 ,  Y02B20/347

    Abstract: A closed-loop LED drive circuit includes at least one LED, a voltage source, and a voltage regulator connected to the voltage source to provide a regulated voltage output. A one-time-programmable voltage source is connected to an output of the voltage regulator and a current controlled drive circuit is connected to the one-time-programmable voltage source for providing a drive current to the at least one LED in response to an output from the one-time-programmable voltage source. An end of line tester monitors the light intensity of the LED device and provides a signal indicative thereof to said one-time-programmable voltage source. The one-time-programmable voltage source stores the light intensity value and uses the light intensity value to control its output voltage to the current control drive circuit.

    Portable lamp comprising an improved locking mechanism
    8.
    发明授权
    Portable lamp comprising an improved locking mechanism 有权

    公开(公告)号：US10012372B2

    公开(公告)日：2018-07-03

    申请号：US15398161

    申请日：2017-01-04

    Applicant: Zedel

    Inventor： Christophe Marie ,  Raphael Bortolotti

    IPC: F21V23/04 ,  H05B33/08 ,  H05B37/02 ,  F21V21/084 ,  F21L4/00

    CPC classification number: F21V23/0414 ,  F21L4/00 ,  F21V21/084 ,  F21V23/0407 ,  H05B33/0845 ,  H05B33/0848 ,  H05B37/0227

    Abstract: A headlamp with a light source, an electrical power source and several states controlling power sources and light beams is presented.The first state corresponds to at least one activated state in which the electrical power source is coupled to a light source to generate a light beam.The second state corresponds to a deactivated state where the electrical power source is not coupled to a light source and no light beam is generated.The third state corresponds to a locked state in which the electrical power source is not coupled to a light source and no light beam is generated;Also included is a switching mechanism to receive a first and a second physical user input through one switching element. A processor is coupled to the switching mechanism and is used to select one among the first, second and third states in response to the physical user inputs.

    Lighting system and related method of operating a lighting system
    10.
    发明授权
    Lighting system and related method of operating a lighting system 有权

    公开(公告)号：US09986608B2

    公开(公告)日：2018-05-29

    申请号：US15659666

    申请日：2017-07-26

    Applicant: OSRAM GmbH

    Inventor： Enrico Raniero ,  Francesco Angelin

    IPC: H05B33/00 ,  H05B33/08

    CPC classification number: H05B33/0827 ,  H05B33/0842 ,  H05B33/0848 ,  H05B33/0866 ,  H05B33/089

    Abstract: The lighting system includes a voltage source for generating a constant direct current adapted to supply lighting modules, a number n of electronic switches, a current sensor connected in series with the voltage source to detect a measurement signal indicative of the current provided by the voltage source, and a control unit. The control unit generates the drive signals for the electronic switches. It varies the drive signals, such that: in a first instant, all lighting modules are connected to the voltage source; and during a sequence of instants, each time a different set of lighting modules is connected to the voltage source. It then determines the current flowing through all lighting modules as a function of the measurement signal detected in the first instant, and determines the currents which flow through the various lighting modules as a function of the measurement signals detected during the sequence of instants.

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