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2. 发明授权

US5920189A Auto ranging current monitor with common mode correction 失效
标题翻译：具有共模校正功能的自动测距电流监视器
公开(公告)号：US5920189A
公开(公告)日：1999-07-06
申请号：US756471
申请日：1996-11-26
申请人： R. Thomas Fisher , Ronald W Dale , Larry W Soutar
发明人： R. Thomas Fisher , Ronald W Dale , Larry W Soutar
IPC分类号： G01R15/09 , G01R19/00 , G01R21/06
CPC分类号： G01R15/09 , G01R19/0092
摘要： An improved current monitor for measuring current over a wide dynamic range. The current monitor includes a low current channel, a high current channel, and a switch for selecting the low current channel if the measured current is below a predetermined level and the high current channel if the current is above the predetermined level. The output of the high current channel is voltage encoded by adding a fixed offset. The current monitor determines that the measured current is from the low current channel if the reading is below the offset and from the high current channel if the reading is above the offset. A current level output device automatically outputs a decoded current reading based on this determination. The current monitor also incorporates a low current error compensation circuit to compensate for parasitic current when the current monitor is using the high current channel. The current monitor also incorporates a device for reducing the common mode error voltage to zero in the differential amplifiers used to convert current across shunt resistors in the low and high current channels to a voltage signal.
摘要翻译：一种改进的电流监测器，用于在宽动态范围内测量电流。电流监视器包括低电流通道，高电流通道，以及用于当测量电流低于预定电平时选择低电流通道的开关，如果电流高于预定电平，则该电流监视器包括高电流通道。高电流通道的输出通过添加固定偏移量进行电压编码。如果读数低于偏移量，并且读数高于偏移量，则当前显示器确定测量的电流来自低电流通道。电流输出装置根据该判定自动输出解码的电流读数。电流监视器还包含一个低电流误差补偿电路，用于补偿当前监视器使用高电流通道时的寄生电流。电流监视器还包括用于在用于将低通和高电流通道中的分流电阻器上的电流转换为电压信号的差分放大器中将共模误差电压降低到零的装置。

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