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1. 发明申请

US20050185353A1 Overcurrent protection for solid state switching system 有权
标题翻译：固态开关系统的过电流保护
公开(公告)号：US20050185353A1
公开(公告)日：2005-08-25
申请号：US11048123
申请日：2005-01-31
申请人： Eric Rasmussen , John Thurk , Eric Suomi
发明人： Eric Rasmussen , John Thurk , Eric Suomi
IPC分类号： H02M1/44 , H02M7/00 , H05B39/00 , H05B39/04 , H05K1/03 , H05K1/14 , H05K3/22 , H02H7/10
CPC分类号： H02M1/44 , H02M1/32 , H02M5/293 , H02M2001/0009 , H05B39/00 , H05B39/044 , H05K1/0306 , H05K1/14 , H05K1/144 , H05K3/0061 , H05K3/222 , H05K2201/10166 , Y02B20/146
摘要： Current sensing resistors are connected directly to output terminals of MOSFETs forming the series switching stage of a PWM sinewave dimmer. An analog sensed current signal is coupled through an EMI resistant current link to comparators that provide an overcurrent indication in response to an overcurrent condition. A logic circuit overrides PWM control signals from a programmable controller, and operates drivers to render the series switching stage nonconductive and to render a clamp switching stage conductive until after the end of the current PWM duty cycle power on segment. The logic circuit sends an overcurrent signal through an optocoupler to an input of the programmable controller. The input of the controller is polled at a clock frequency for overcurrent signals and if the count exceeds a limit in any half cycle, or a maximum sum in sixteen half cycles of the AC supply, the series switching stage is rendered nonconductive and the clamp switching stage is rendered conductive pending a reset signal.
摘要翻译：电流检测电阻直接连接到形成PWM正弦波调光器的串联切换级的MOSFET的输出端。模拟感测电流信号通过抗EMI电流链路耦合到提供响应于过电流状况的过电流指示的比较器。逻辑电路覆盖来自可编程控制器的PWM控制信号，并且操作驱动器以使串联开关级不导通，并使钳位开关级导通，直到电流PWM占空比上电为止。逻辑电路通过光耦合器将过电流信号发送到可编程控制器的输入端。控制器的输入以过电流信号的时钟频率进行轮询，如果计数超过任何半周期的限制，或交流电源的十六个半周期内的最大和，则串联切换级变为非导通，钳位切换在复位信号之前，阶段被导通。

2. 发明申请

US20060268484A1 Low voltage overcurrent protection for solid state switching system 有权
标题翻译：固态开关系统的低压过流保护
公开(公告)号：US20060268484A1
公开(公告)日：2006-11-30
申请号：US11137053
申请日：2005-05-25
申请人： John Thurk , Eric Rasmussen , Eric Suomi
发明人： John Thurk , Eric Rasmussen , Eric Suomi
IPC分类号： H02H3/08
CPC分类号： H05B41/2856 , Y02B20/186
摘要： A current sensing transformer having a low impedance primary winding is connected in series with a filter and load circuit supplied with output current by a high frequency switching PWM power supply such as a sinewave dimmer. Sensed output current is supplied to a microprocessor based programmable controller. The controller performs a routine including a family of overcurrent tests. Tests of the family are satisfied by the presence of different output current values for different time durations. At least one of the tests is enabled only at low requested output voltages or dimming levels. In response to satisfaction of any of the tests, a series power switching stage of the power supply is rendered nonconductive to shut down the power supply.
摘要翻译：具有低阻抗初级绕组的电流感测变压器与通过诸如正弦波调光器的高频开关PWM电源提供输出电流的滤波器和负载电路串联连接。感应输出电流提供给基于微处理器的可编程控制器。控制器执行包括一系列过电流测试的程序。在不同时间段内出现不同的输出电流值，满足家庭测试。至少有一个测试仅在低要求的输出电压或调光级别启用。响应于任何测试的满足，电源的串联电源开关级不导通以关闭电源。

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