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1. 发明申请

WO9902997A3 DC AND AC CURRENT SENSOR WITH DISCONTINUOUS SAMPLING 审中-公开
标题翻译：直流和交流电流传感器不连续采样
公开(公告)号：WO9902997A3
公开(公告)日：1999-04-08
申请号：PCT/IB9801034
申请日：1998-07-06
申请人： KONINKL PHILIPS ELECTRONICS NV , PHILIPS NORDEN AB
发明人： GU WEN-JIAN , LEE NAI-CHI
IPC分类号： G01R15/18
CPC分类号： G01R15/183
摘要： Current is sensed by a circuit which provides a high frequency reversing voltage to a sensing winding on a current transformer, for driving the transformer into its linear region once per cycle of applied voltage. Current through the sensing winding is sampled while the transformer is in that linear region. After taking a current sample application of the reversing voltage, sensor power consumption is reduced by inhibiting the application of voltage to the sensing winding for one or more of the high frequency cycles, or the same control and sensing circuitry is used to cause application of reversing voltage to a sensing winding on a different transformer measuring current through a different conductor, such as in a polyphase arrangement or for monitoring ground fault current. Preferably, the current is sampled approximately at the instants of reversal of the voltage being applied to the sensing winding, and the sample having the lower absolute value is selected as a sample proportional to the line current.
摘要翻译：通过电路感测电流，该电路向电流互感器上的感测绕组提供高频反向电压，用于每个施加电压周期将变压器驱动到其线性区域一次。当变压器处于该线性区域时，通过感测绕组的电流被采样。在对当前的反向电压采样进行采样之后，通过禁止在一个或多个高频周期对感测绕组施加电压来降低传感器功耗，或者使用相同的控制和感测电路来引起反向电压到不同变压器上的感测绕组，测量通过不同导体的电流，例如在多相布置中或用于监测接地故障电流。优选地，在施加到感测绕组的电压的反转时刻大致对电流进行采样，并且选择具有较低绝对值的样本作为与线电流成比例的采样。

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