Current sensing circuit for use in a current measurement probe

Details Current sensing circuit for use in a current measurement probe Current sensing circuit for use in a current measurement probe

2007-12-18

2007-12-18

Tang, Minh N. (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Self-calibration

C324S11700H, C324S11700H

Reexamination Certificate

active

11430400

ABSTRACT:
A current sensing circuit has a transformer where a current to be measured induces a magnetic flux into a magnetic core. The magnetic core has a magneto-electric converter for sensing DC to low frequency current signals and a secondary winding for sensing higher frequency current signals. The magneto-electric converter generates an output that is coupled via an amplifier to a non-inverting input of a transimpedance amplifier. The inverting input of the transimpedance amplifier is coupled to the secondary winding of the transformer. A current signal path having a transimpedance resistor couples the inverting input to the output of the transimpedance amplifier. The transimpedance amplifier functions as a power amplifier for coupling a nulling current to the transformer for DC to low frequency current signals and functions as a transimpedance gain amplifier for higher frequency signals.

REFERENCES:
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patent: 5477135 (1995-12-01), Baker
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patent: 6121768 (2000-09-01), Taurand
patent: 6566854 (2003-05-01), Hagmann et al.
patent: 6856129 (2005-02-01), Thomas et al.
patent: 2004/0100249 (2004-05-01), Mende

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