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    • 5. 发明申请
    • Detector circuit to be used for measuring current
    • 检测电路用于测量电流
    • US20070145968A1
    • 2007-06-28
    • US10579967
    • 2004-11-26
    • Hans Jorgensen
    • Hans Jorgensen
    • G01R15/18
    • G01R15/185H01F27/34H01F38/28
    • A detector circuit is to be used for measuring current by means of substantially identically wound ring core transformers, in which magnetomotive forces are induced by a main current. The magnetomotive forces are counteracted by magnetomotive forces induced by a compensating current. Two of the ring core transformers (2, 3) are magnetized in antiphase by means of a modulation signal. The detector circuit includes optionally a synchronous rectifier for providing an adjusting signal for the compensating current. According to the invention means are provided for compensating for possible differences between the two ring core transformers for the modulation signal. These means include a common winding surrounding the two ring cores (2, 3), said common winding detecting a possible error signal used in a negative feedback loop which automatically seeks to establish an equilibrium.
    • 检测器电路将用于通过基本相同的环形磁芯变压器测量电流,其中磁通量由主电流引起。 磁通量由补偿电流引起的磁动势抵消。 两个环形磁芯变压器(2,3)通过调制信号反相磁化。 检测器电路可选地包括用于为补偿电流提供调整信号的同步整流器。 根据本发明,提供了用于补偿用于调制信号的两个环形铁芯变压器之间的可能差异的装置。 这些装置包括围绕两个环形芯(2,3)的公共绕组,所述公共绕组检测在负反馈回路中使用的可能的误差信号,其自动寻求建立平衡。