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公开(公告)号：US11272598B2
公开(公告)日：2022-03-08
申请号：US16816917
申请日：2020-03-12
摘要： Disclosed herein are transconductance circuits, as well as related methods and devices. In some embodiments, a transconductance circuit may include an amplifier having a first input coupled to a voltage input of the transconductance circuit, and a switch coupled between an output of the amplifier and a second input of the amplifier.
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公开(公告)号：US11246202B2
公开(公告)日：2022-02-08
申请号：US16500674
申请日：2018-04-05
申请人： SIGNIFY HOLDING B.V.
摘要： An LED lighting driver has a switched mode power supply which generates an auxiliary power supply. The auxiliary power supply circuit has a first power supply inductor and a second power supply inductor in series with each other. The second power supply inductor is selectively switched into or out of the auxiliary power supply circuit, thereby varying a transformer ratio to the main energy storage inductor. The switching may be made based on a light output mode or a standby mode being in operation. The standby mode then enables more efficient generation of an auxiliary supply voltage.
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公开(公告)号：US20210378070A1
公开(公告)日：2021-12-02
申请号：US17402941
申请日：2021-08-16
IPC分类号： H05B45/375 , F21S41/663 , F21S41/141 , H05B45/34 , H05B45/44 , B60Q1/14 , B60Q11/00 , H05B45/52 , H05B45/56
摘要： A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature Tj.
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公开(公告)号：US20210360759A1
公开(公告)日：2021-11-18
申请号：US17280475
申请日：2019-09-25
申请人： VALEO VISION
发明人： Samuel DAROUSSIN , Zdravko ZOJCESKI
IPC分类号： H05B45/44 , F21S41/153 , H05B47/16
摘要： The invention relates to a matrix light source comprising a plurality of elementary light sources with light-emitting semiconductor elements, and a common substrate that is in contact with an integrated circuit. The integrated circuit is configured to delay, for a predetermined duration, the light-up of the elementary sources, upon receiving a light-up command.
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公开(公告)号：US20210337642A1
公开(公告)日：2021-10-28
申请号：US16769863
申请日：2020-05-09
发明人： Fuyi WANG , Mingjong JOU , Zhao WANG , Fengcheng XU , Jinfeng LIU
IPC分类号： H05B45/44 , G02F1/13357 , H05B45/10
摘要： The present invention provides a backlight unit and a control method thereof, and a liquid crystal display device. The control method includes steps as follows: obtaining backlight data corresponding to each partition, wherein the backlight data comprises a plurality of bits of data; dividing the light-emitting unit of each partition into a plurality of subfields with different durations in a light-emitting process during a frame, wherein each subfield corresponds to one bit of data, and any two subfields comprise different numbers of secondary subfields; and outputting the plurality of subfields in a preset order.
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公开(公告)号：US20210315081A1
公开(公告)日：2021-10-07
申请号：US17280476
申请日：2019-09-25
申请人： VALEO VISION
摘要： A matrix light source intended to be supplied with a voltage and having a plurality of electroluminescent semiconductor element-based elementary light sources and a common substrate in contact with an integrated circuit. The integrated circuit includes, for each elementary light source, a switching device for selectively connecting it to a voltage source on the basis of a first control signal. The substrate includes, for at least one of the elementary light sources, an open-circuit fault detection circuit for detecting an open-circuit fault with the elementary light source.
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77.发明授权公开(公告)号：US11122659B2
公开(公告)日：2021-09-14
申请号：US17012145
申请日：2020-09-04
申请人： Huarong Xie
发明人： Huarong Xie
IPC分类号： H05B45/20 , H05B45/30 , H05B45/325 , H05B45/42 , H05B45/44
摘要： A three-wire forward and reverse LED light string control circuit, comprising an external power supply, a MCU, a driving circuit and an LED light group circuit, the driving circuit comprises a P-channel first FET, a P-channel third FET, a P-channel fifth FET, a P-channel seventh FET, an N-channel second FET, an N-channel fourth FET, and an N-channel sixth FET; a first port is provided on the wire between the drain of the second FET and the drain of the third FET, a second port is provided on the wire between the drain of the fourth FET and the drain of the fifth FET, and a third port is provided on the wire between the drain of the sixth FET and the drain of the seventh FET. A 6-way LED light string using the said three-wire forward and reverse LED light string control circuit is also provided.
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公开(公告)号：US11064587B2
公开(公告)日：2021-07-13
申请号：US16879721
申请日：2020-05-20
发明人： Hye Man Jung , Keith Hopwood
IPC分类号： H05B45/375 , H05B45/20 , H05B45/44 , H03K5/24
摘要： An LED lighting apparatus including a rectifier to rectify AC voltages having different magnitudes and generate driving voltages corresponding to rectified voltages, a buck converter connected to an output terminal of the rectifier and generate an LED driving current corresponding to the driving voltages, a variable reference voltage comparator to receive the driving voltages, and generate variable reference voltages that fluctuate in correspondence to magnitudes of the output driving voltages, compare the driving voltages and the variable reference voltages, and output signals for controlling an operation of the buck converter, an LED including at least one LED group and driven by the LED driving current generated by the buck converter, and a controller including a converter controller to control the operation of the buck converter and a constant current controller to constant current-control the LED driving current applied to the at least one LED group.
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79.发明申请公开(公告)号：US20210176849A1
公开(公告)日：2021-06-10
申请号：US17013532
申请日：2020-09-04
发明人： Pengfei WANG , Xin ZHOU , Fanbin WANG , Chengbin LIU
摘要： The disclosure relates to a device and a circuit for protecting controlled loads, and an apparatus for switching between the loads. The device includes: a plurality of load switches, comprising at least first and second load switches, wherein the first and second load switches are respectively in series connection with first and second controlled loads to form first and second controlled load branches in parallel connection, and each load switch is turned on when a switch control terminal is in a first voltage/current interval and turned off when the switch control terminal is in a second voltage/current interval; and a signal control module, including a signal control element, wherein the signal control element is switched between the switch control terminals of the first and second load switches for connection, and the signal control element enables, when being connected to the switch control terminal, the corresponding switch control terminal to be in the second voltage/current interval, and enables, when being disconnected from the switch control terminal, the corresponding control terminal to be in the first voltage/current interval.
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公开(公告)号：US20210153317A1
公开(公告)日：2021-05-20
申请号：US17158792
申请日：2021-01-26
申请人： Hubbell Incorporated
摘要： Lighting systems and methods implementing toggle control are provided. In one example implementation, a lighting system can include a first LED array having one or more LED devices and a second LED array having one or more LED devices. The system can further include a single throw circuit interrupter configured to receive power from a power source. The system can further include a power conversion circuit configured to convert an input power received via the toggle switch to a power output for the first LED array and the second LED array. The power conversion circuit can be configured to control a power distribution ratio between the first LED array and the second LED array based at least in part on a detected toggle input (e.g., a toggle pattern) implemented using the single throw circuit interrupter.
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