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公开(公告)号：US10574026B2
公开(公告)日：2020-02-25
申请号：US15923823
申请日：2018-03-16
摘要： A driver circuit for driving a laser diode is described herein. In accordance with a first exemplary embodiment the driver circuit includes a first electronic switch connected to an output node that is configured to be operably connected to a laser diode. The electric connection between the first electronic switch and the output node has a first inductance. The driver circuit further includes a bypass circuit that is coupled to the output node and configured to take over, when activated, the current supplied to the output node via the first electronic switch, thus magnetizing the first inductance.
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公开(公告)号：US10085314B1
公开(公告)日：2018-09-25
申请号：US15921406
申请日：2018-03-14
CPC分类号： H05B33/0815 , H05B33/0824 , H05B33/0845 , H05B33/089 , H05B37/0281 , Y02B20/347 , Y02B20/42
摘要： A device for regulating a voltage includes a first branch switch, a second branch switch, and a control module. The control module is configured to determine an instruction to change from a first state to a second state. In response to the instruction, the control module is configured to activate the second branch switch, drive a power module to increase a supply voltage to provide a supply power for activating a second set of LEDs, drive the first branch switch to dissipate a portion of the supply power to provide a target power for activating a first set of LEDs in response to determining that a current at the second branch switch does not exceed a current threshold, and deactivate the first branch switch in response to determining that the current at the second branch switch exceeds the current threshold.
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公开(公告)号：US20180255613A1
公开(公告)日：2018-09-06
申请号：US15446530
申请日：2017-03-01
CPC分类号： H05B33/083 , B60Q1/1423 , B60Q1/34 , H05B33/0812 , H05B33/0815 , H05B33/0851
摘要： An example method for preventing overcurrent in light-emitting diode (LED) chains comprises deactivating a current regulation control loop connected to a plurality of LED chains; regulating, via a voltage regulation control loop, a forward voltage of the plurality of LED chains; upon determining that a forward voltage of the plurality of LED chains is equal to a target operating voltage for a subset of the plurality of LED chains, bypassing at least one of the plurality of LED chains such that only the subset of the plurality of LED chains is connected to the current regulation control loop; and upon determining that an output current of the subset of the plurality of LED chains is equal to a target operating current for the subset of the plurality of LED chains: deactivating the voltage regulation control loop; and activating the current regulation control loop.
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公开(公告)号：US20170367155A1
公开(公告)日：2017-12-21
申请号：US15690793
申请日：2017-08-30
CPC分类号： H05B33/0815 , G05F1/56 , H02M1/08 , H02M3/156 , H05B33/0812 , Y02B20/343 , Y02B20/345
摘要： In one example, a method includes generating, by a current source of a device, a first portion of a power signal that drives one or more load elements. In this example, a second portion of the power signal is generated by one or more components that are external to the device and are in parallel to the current source such that the second portion of the power signal does not flow through the current source.
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公开(公告)号：US20160349304A1
公开(公告)日：2016-12-01
申请号：US14723182
申请日：2015-05-27
发明人： Damiano Sartori , Marco Pamato , Maurizio Galvano
CPC分类号： G01R31/025 , B60Q11/005 , G01R31/2635 , H05B33/0827 , H05B33/0887
摘要： An embodiment method for short-circuit detection includes determining a set of local reference voltages each associated with a respective load chain in a plurality of load chains, and determining a global reference voltage in accordance with the set of local reference voltages. The method also includes determining, for each load chain in the plurality of load chains, a respective per-chain reference voltage in accordance with the global reference voltage, and comparing, for each load chain in the plurality of load chains, the respective per-chain reference voltage relative to a respective measured voltage across each load chain to determine a respective short-circuit condition.
摘要翻译： 用于短路检测的实施例方法包括：确定与多个负载链中的相应负载链相关联的一组局部参考电压，以及根据该组参考电压确定全局参考电压。 该方法还包括针对多个负载链中的每个负载链确定根据全局参考电压的相应的每链参考电压，并且对于多个负载链中的每个负载链， 链参考电压相对于每个负载链上的相应测量电压以确定相应的短路状况。
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公开(公告)号：US20160128139A1
公开(公告)日：2016-05-05
申请号：US14530453
申请日：2014-10-31
发明人： Marco Pamato , Damiano Sartori , Maurizio Galvano
IPC分类号： H05B33/08
CPC分类号： H05B33/089 , H05B33/0827
摘要： A method and circuit are described in which a maximum voltage is determined from among a plurality of series load voltages, where each series load voltage of the plurality of series load voltages is a voltage defined by a corresponding series of N loads of a plurality of series of N loads, where N is an integer greater than one. Also, a minimum voltage may be determined from among the plurality of series load voltages. Next, the maximum voltage from among the plurality of series load voltages may be compared with the minimum voltage from among the plurality of series load voltages to make a determination as to whether the maximum voltage from among the plurality of series load voltages exceeds the minimum from among the plurality of series load voltages by a threshold voltage. Then, an indication can be output based on the results of the determination.
摘要翻译： 描述了一种方法和电路，其中从多个串联负载电压中确定最大电压，其中多个串联负载电压的每个串联负载电压是由多个系列的相应的一系列N个负载定义的电压 的N个负载，其中N是大于1的整数。 此外，可以从多个串联负载电压中确定最小电压。 接下来，可以将多个串联负载电压中的最大电压与多个串联负载电压中的最小电压进行比较，以确定多个串联负载电压中的最大电压是否超过最小值 在多个串联负载电压之间通过阈值电压。 然后，可以基于确定的结果来输出指示。
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公开(公告)号：US11382198B2
公开(公告)日：2022-07-05
申请号：US16898057
申请日：2020-06-10
IPC分类号： H05B47/105 , H05B45/14 , H05B47/25 , H05B45/52 , F21S4/26 , H05B45/3725 , F21Y115/10 , F21Y103/10
摘要： This disclosure includes systems, methods, and techniques for controlling delivery of power to one or more strings of light-emitting diodes (LEDs). For example, a circuit includes a power converter configured to generate an electrical current, a switching device, and a sensor. The sensor is configured to compare a magnitude of the electrical current to a threshold, and in response to the magnitude exceeding the threshold, cause the switching device to turn on in order to sink a portion of the electrical current to prevent the magnitude of the electrical current from exceeding the threshold. When the switching device is turned on, the electrical current is divided into an undesired electrical current that flows across the switching device and a desired electrical current that flows to the string of LEDs.
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公开(公告)号：US11153948B2
公开(公告)日：2021-10-19
申请号：US16806618
申请日：2020-03-02
发明人： Davide Ghedin , Maurizio Galvano , Stefan Stoegner
IPC分类号： H05B45/37 , H05B47/175 , H05B45/44 , H05B45/14
摘要： This disclosure describes techniques to control LED lighting systems using a circuit that includes communication, control and LED driver circuitry specific to a limited number of particular lighting functions. The circuit may communicate via a standard communication bus protocol and include feedback, protection and sensing circuitry to monitor the lighting functions and LED performance. The circuit may be small enough to be included as part of a lighting assembly, such as a vehicle headlight assembly. The included feedback and monitoring circuitry that may be physically close the driven LEDs may simplify the wiring when compared to other techniques. A configuration process for the circuit may further simplify the wiring connections, as well as reduce the development and manufacturing costs for lighting systems that may use the circuit. Limiting the lighting functions of each circuit may improve thermal management by distributing the thermal load.
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公开(公告)号：US10536070B1
公开(公告)日：2020-01-14
申请号：US16052479
申请日：2018-08-01
发明人： Roberto Penzo , Maurizio Galvano
IPC分类号： H02M3/158 , H02M1/08 , H01L29/20 , H03K17/687 , H01L29/778
摘要： A device for switching Gallium Nitride (GaN) devices includes a high side driver, low side driver, and high side charge circuitry. The high side driver is adapted to control a high side GaN device using a high side supply. The low side driver is adapted to control a low side GaN device using a low side supply. The high side charge circuitry is adapted to charge the high side supply with the low side supply when the low side driver activates the low side GaN device.
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公开(公告)号：US10206252B2
公开(公告)日：2019-02-12
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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