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公开(公告)号：US20220227286A1
公开(公告)日：2022-07-21
申请号：US17152519
申请日：2021-01-19
摘要： A vehicle headlamp control circuit is configured to control a vehicle headlamp comprising a plurality of lighting elements. The vehicle headlamp control circuit may comprise a memory that stores information for controlling the plurality of lighting elements, and a driver circuit that drives the plurality of lighting elements based on the information, wherein the information compensates for one or more failed elements of the plurality of lighting elements.
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公开(公告)号：US11071184B1
公开(公告)日：2021-07-20
申请号：US16837360
申请日：2020-04-01
发明人： Rosario Chiodo , Adolfo De Cicco , Pietro Vallese
IPC分类号： H05B45/46 , H05B45/325 , H05B45/31
摘要： The disclosure describes techniques for driving a plurality of light emitting diodes (LEDs) arranged in a parallel connection by using PWM (Pulse Width Modulation) dimming. The techniques of this disclosure describe the generation and application of a fixed phase shift map to a driver matrix based on pixel position. Each pixel corresponds to an LED light source. In the fixed phase shift map, each pixel will have a pre-defined phase shift calculated to induce a determined variation in turn-on time for geometrically neighbouring pixels to spread out current demand over time during PWM dimming.
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公开(公告)号：US10945323B1
公开(公告)日：2021-03-09
申请号：US16837301
申请日：2020-04-01
IPC分类号： H05B45/50 , H05B45/37 , H05B45/3725 , G01R31/3183
摘要： This disclosure includes systems, methods, and techniques for controlling a plurality of light-emitting diodes (LEDs). For example, a circuit includes a switching device, where the switching device is electrically connected to an LED of the plurality of LEDs, and where the switching device is configured to control whether the LED receives an electrical signal from a power source. Additionally, the circuit includes processing circuitry configured to determine that the LED is associated with a bright failure condition by attempting to prevent the LED from receiving the electrical signal from the power source using the switching device and disable the LED in response to detecting the bright failure condition.
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公开(公告)号：US10165634B2
公开(公告)日：2018-12-25
申请号：US15260055
申请日：2016-09-08
摘要： According to an example, a device is provided for driving several light sources, wherein the device is arranged to sense a supply signal and apply a phase shift to a switching signal of at least one of the several light sources based on the sensed supply signal. Also, accordingly a method, a lighting device, a computer program product and a computer-readable medium are suggested.
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公开(公告)号：US09077240B2
公开(公告)日：2015-07-07
申请号：US14018878
申请日：2013-09-05
IPC分类号： H02H3/08 , H02M3/156 , H03K17/082 , H02J7/00
CPC分类号： H02M3/156 , H02H3/08 , H02J2007/0039 , H03K17/0822
摘要： A semiconductor device is described that includes a switch to switch a load current path on and off according to an input signal. The device further includes an over-current detector to compare a load current with a threshold and to signal an over-current when the load current reaches or exceeds the threshold. The device further includes a control unit to set the threshold to a higher value while in a first state of operation and to a lower value while in a second state of operation, and to at least temporarily switch the switch off when an over-current is signalled, change from the first state of operation to the second state of operation when a first pre-defined time span has elapsed, and to change from the from the second state of operation to the first state when the switch is off for more than a second pre-defined time span.
摘要翻译： 描述了一种半导体器件，其包括根据输入信号来打开和关闭负载电流路径的开关。 该装置还包括过电流检测器，用于将负载电流与阈值进行比较，并在负载电流达到或超过阈值时向其发出过电流信号。 该装置还包括控制单元，用于在第一操作状态下将阈值设置为较高值，而在第二操作状态下将阈值设置为较低值，并且至少在过电流为 发信号时，当经过第一预定时间跨度时从第一操作状态改变到第二操作状态，并且当开关断开多于一个时间时从第二操作状态变为第一状态 第二预定义时间跨度。
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公开(公告)号：US11718220B2
公开(公告)日：2023-08-08
申请号：US17152519
申请日：2021-01-19
CPC分类号： B60Q1/1423 , B60Q1/08 , H05B45/12 , H05B45/44
摘要： A vehicle headlamp control circuit is configured to control a vehicle headlamp comprising a plurality of lighting elements. The vehicle headlamp control circuit may comprise a memory that stores information for controlling the plurality of lighting elements, and a driver circuit that drives the plurality of lighting elements based on the information, wherein the information compensates for one or more failed elements of the plurality of lighting elements.
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公开(公告)号：US20220114286A1
公开(公告)日：2022-04-14
申请号：US17070855
申请日：2020-10-14
摘要： An apparatus may comprise an electronic circuit configured to perform one or more functions or operations, and a memory associated with the electronic circuit. The memory stores a customer-side circuit identification (ID) comprising watermark value combined with a pseudo-random number that is generated as a function of a seed value, wherein the seed value is based on a timestamp generated by computer. An external interface may be coupled to the memory, wherein the external interface provides read-access to the customer-side circuit ID.
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公开(公告)号：US20210311116A1
公开(公告)日：2021-10-07
申请号：US16837247
申请日：2020-04-01
发明人： Adolfo De Cicco , Rosario Chiodo
IPC分类号： G01R31/3187 , H05B45/50 , H05B45/37
摘要： In some examples, a device includes a built-in self-test for detecting a fault between a first light emitting diode (LED) and a second LED. The device includes a first pair of pads configured to connect to the first LED and a second pair of pads configured to connect to the second LED. The built-in self-test is configured to control a first driver and a second driver to turn on, one-by-one, respective pass switches connected to the first and second pairs of pads. The built-in self-test is configured to then determine the first and second forward voltages across the first and second LEDs. The built-in self-test can determine whether the fault exists between the first and second LEDs based on the forward voltages.
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公开(公告)号：US09781800B2
公开(公告)日：2017-10-03
申请号：US14719035
申请日：2015-05-21
IPC分类号： H05B33/08
CPC分类号： H05B33/0857 , H05B33/0842
摘要： A device for driving several light sources is provided, wherein the several light sources are arranged in a matrix structure; wherein the several light sources of the matrix structure are connected to a semiconductor device; wherein a portion of the semiconductor device corresponds to a light source of the matrix structure, wherein the portion of the semiconductor device comprises a diagnosis function which when activated is arranged for supplying an output diagnosis signal.
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公开(公告)号：US09661708B1
公开(公告)日：2017-05-23
申请号：US15260080
申请日：2016-09-08
发明人： Adolfo De Cicco , Maurizio Galvano
IPC分类号： H05B33/08 , F21V23/00 , F21V23/06 , F21Y115/10
CPC分类号： H05B33/0887 , H05B33/0812 , H05B33/086 , Y02B20/343
摘要： A device for driving several light sources is provided, wherein the several light sources are arranged in a light matrix structure, the device comprising a common circuitry and a driver matrix; wherein each cell of the driver matrix is connected to at least one cell of the light matrix structure; wherein a sense component is provided on a cell of the driver matrix, wherein the sense component determines a sense signal that is based on, and in particular dependent on or proportional to, an output signal driving the light source that is connected to this cell of the driver matrix; wherein the common circuitry comprises an adjustment circuitry that is arranged for obtaining the sense signal, for adjusting a reference signal, and for conveying the reference signal to the cell of the driver matrix that determined the sense signal; wherein the cell of the driver matrix is arranged for adjusting the output signal driving the light source based on the reference signal. Also, an according method is suggested.
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