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    LED arrangement and LED driving method
    2.
    发明授权
    LED arrangement and LED driving method 有权

    公开(公告)号：US10334669B2

    公开(公告)日：2019-06-25

    申请号：US15922039

    申请日：2018-03-15

    申请人： SIGNIFY HOLDING B.V.

    发明人： Shan Wang ,  Chun Yang ,  Zhi Quan Chen ,  Gang Wang ,  Jie Fu

    IPC分类号： H05B33/08 ,  H05B37/02 ,  H05B39/04 ,  G05F1/10 ,  F21Y115/10

    摘要： A lighting circuit uses a tapped linear driver architecture in which there are at least two LED types; a first LED type with a first forward voltage, and a second LED type with a second forward voltage at least double the first forward voltage. The first segment of the tapped linear driver comprises more LEDs of the first type than the second type and the last segment comprises more LEDs of the second type than the first type. This arrangement enables a reduction in the number of LEDs needed, but without significantly impacting on the efficiency of the circuit.

    LED arrangement and LED driving method
    5.
    发明授权
    LED arrangement and LED driving method 有权

    公开(公告)号：US10375782B2

    公开(公告)日：2019-08-06

    申请号：US15737886

    申请日：2016-06-08

    申请人： SIGNIFY HOLDING B.V.

    发明人： Jie Fu ,  Shu Xu

    IPC分类号： H05B33/08 ,  F21Y105/12 ,  F21Y115/10

    摘要： An LED arrangement uses a tapped driver driven by a rectified mains input and placed over a light output surface. There are at least first and second groups of LEDs on the light output surface. The total light output density for the LEDs of the second group (which are turned on for less of the mains cycle) per unit area of the light output surface is greater than the total light output density for the LEDs of the first group per unit area of the light output surface. A fraction of a light emitting surface of the second group (16) of LEDs to a second area (20B) of the light output surface occupied in a macro view by the second group (16) of LEDs, is larger than a fraction of a light emitting surface of the first group (14) of LEDs to a first area (20A) of the light output sur face occupied in a macro view by the first group (14) of LEDs. This means the light output density when averaged over time is made more consistent between the two (or more) groups of LEDs.

    LED driver circuit, lighting arrangement and driving method
    8.
    发明授权
    LED driver circuit, lighting arrangement and driving method 有权

    公开(公告)号：US10299328B2

    公开(公告)日：2019-05-21

    申请号：US15560822

    申请日：2016-03-15

    申请人： SIGNIFY HOLDING B.V.

    发明人： Jie Fu ,  Liang Shi ,  Xiao Sun ,  Jimmy Jiang

    IPC分类号： H05B33/08

    摘要： A first LED driver circuit comprising: a first input interface (30) for receiving an AC power input and providing a first output, wherein said first output is adapted to be connected to a second LED driver circuit; a first LED driver (32) powered by the first output; a first shorting element (36) for shorting the first output; a first control arrangement (38) for controlling the first shorting element wherein the first control arrangement (38) is adapted to close the first shorting element (36) during only one subset of half cycles of the AC power input to short circuit the first LED driver (32) and to prevent the first LED driver (32) from being powered by the AC power input, when the second LED driver circuit is powered by the AC power input complementarily with respect to the unpowered first LED driver (32) and, open the first shorting element (36) during the other subset of half cycles to allow the AC power input to power the first LED driver (32), when the second LED driver circuit is not powered by the AC power input complementarily with respect to the first LED driver (32); wherein the half cycle is the positive amplitude duration or the negative amplitude duration of the AC power input This means two of the LED driver circuits may be used in series, each one is supplies by power or not complementarily based on only one subset of half cycles of the AC power input.

    LED driving circuit
    9.
    发明授权
    LED driving circuit 有权

    公开(公告)号：US11291094B2

    公开(公告)日：2022-03-29

    申请号：US17269047

    申请日：2019-08-12

    申请人： SIGNIFY HOLDING B.V.

    发明人： Liang Shi ,  Jie Fu ,  Kelvin Wang

    IPC分类号： H05B45/36 ,  H05B45/20 ,  H05B45/395 ,  H05B45/24 ,  H05B45/325

    摘要： A LED driving circuit (20) is for driving at least two LED segments (22, 24) of different color or color temperature, using an input current which has a current ripple amplitude. The LED driving circuit (20) comprises an input to receive the input current; an output to connect to the at least two LED segments (22, 24); and a current distributing circuit which provides the input current to a single one of the two LED segments when the current is at a peak portion, wherein the current distributing circuit is adapted, when providing the input current to a single one of the two LED segments during the peak portion, to provide the input current to the single one of the two LED segments alternately, and splits the input current into two non-zero currents for different LED segments when the current is in a trough. When all current is provided to one LED segment, the light conversion efficiency is lower than when two segments are driven with lower current. This means the effect which the current ripple has on the light output is reduced. The driving circuit effectively compensates for the current ripple by adjusting the light conversion efficiency so that a flatter light output characteristic is obtained.