Analog limit on digitally set pulse widths

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	Analog limit on digitally set pulse widths
其他题名	Analog limit on digitally set pulse widths
	WYLAND, DAVID C.; MEHTA, AGUSTYA RUCHIR
	2017-01-05
专利权人	MICROSOFT TECHNOLOGY LICENSING, LLC
公开日期	2017-01-05
授权国家	美国
专利类型	发明申请
摘要	A power switching device (e.g., a power MOSFET) drives relatively large surges of pulsed power through a laser emitter of a Time of Flight (TOF) determining system where both the power switching device and laser emitter are closely packed on a printed circuit board having further closely packed and temperature sensitive other components. Waveforms of pulse trains that control the power switching device are programmably defined and thus may include pulse durations that are unduly large or spacing between pulses that are unduly small such that overheating may occur. A pulse duration limiting circuit is provided having an analog integrator configured to integrate over time, the programmably defined pulses and a voltage triggered clamping device coupled to an output of the analog integrator. The voltage triggered clamping device has a predetermined threshold voltage at and above which it is switched from a relatively low transconductances mode to a substantially higher transconductances mode. The voltage triggered clamping device is coupled to a current supplying circuit branch of the system, the current supplying circuit branch being one that has an ability to supply current for switching on the power switching device.
其他摘要	功率开关器件（例如，功率MOSFET）通过飞行时间（TOF）确定系统的激光发射器驱动相对大的脉冲功率浪涌，其中功率开关器件和激光发射器紧密地封装在印刷电路板上，该印刷电路板具有进一步密集和温度敏感的其他组件。控制功率开关器件的脉冲串的波形可编程地限定，并且因此可以包括过大的脉冲持续时间或者脉冲之间的间隔，该脉冲持续时间过小，使得可能发生过热。提供了脉冲持续时间限制电路具有被配置为随时间积分的模拟积分器，可编程定义的脉冲和耦合到模拟积分器的输出的电压触发钳位器件。电压触发钳位器件具有预定阈值电压，在预定阈值电压处，该电压触发钳位器件从相对低的跨导模式切换到基本上更高的跨导模式。电压触发钳位装置耦合到系统的电流供应电路分支，电流供应电路分支是能够提供电流以接通功率开关的电路设备。
主权项	A method using analog processing for limiting risk of overheating of circuit components due to digitally set pulse widths, the method comprising: integrating over time and with analog integration circuitry, digitally defined pulses that cause a turning on and off of surges of current through a load and a corresponding current switching device; and applying an output of the analog integration circuitry to a voltage triggered clamping device, the voltage triggered clamping device having a predetermined threshold voltage at and above which it is switches from being in a first transconductance range to being in a second transconductance range, where transconductances of the second transconductance are substantially larger than corresponding ones of the first transconductance range, the voltage triggered clamping device being coupled to a current supplying circuit branch that has an ability to supply current for switching on said current switching device; wherein if the voltage triggered clamping device is in the first transconductance range, it does not significantly interfere with the ability of the current supplying circuit branch to supply current for switching on the current switching device; and wherein if the voltage triggered clamping device is in the second transconductance range, it removes a substantial amount of current from the current supplying circuit branch and thereby significantly impedes the ability of the current supplying circuit branch to supply current for switching on the current switching device.
申请日期	2015-06-30
专利号	US20170005465A1
专利状态	授权
申请号	US14/755877
公开（公告）号	US20170005465A1
IPC 分类号	H02H9/04 \| H01S5/00 \| H01S5/042 \| G01S7/484
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/51726
专题	半导体激光器专利数据库
作者单位	MICROSOFT TECHNOLOGY LICENSING, LLC
推荐引用方式 GB/T 7714	WYLAND, DAVID C.,MEHTA, AGUSTYA RUCHIR. Analog limit on digitally set pulse widths. US20170005465A1[P]. 2017-01-05.