Current sensing circuit for current measuring probe and current measuring probe thereof

Abstract

The present invention discloses a current sensing circuit for a current measuring probe and the current measuring probe. The current sensing circuit comprises a first transformer, a second transformer, and a first amplifier. The first transformer comprises a first primary coil, a first secondary coil, a first magnetic core, and a magnetoelastic transducer. The second transformer comprises a second primary coil, a second secondary coil, and a second magnetic core. The magnetoelastic transducer is installed in the first magnetic core through a gap in the first magnetic core. The output end of the magnetoelastic transducer is connected to the input end of the first amplifier. The first primary coil and the second primary coil are connected in series between the first input end and the second input end of the current sensing circuit, and the first secondary coil and the second secondary coil are connected in series between the ouput end of the first amplifier and the output end of the current sensing circuit. According to the current sensing circuit, through detecting a high frequency signal by using the magnetic core without a gap, the problem that high frequency performance is limited by a magnetic core gap structure is solved.

Description

technical field [0001] The invention relates to the field of probes, in particular to a current sensing circuit for a current measuring probe and a current measuring probe thereof. Background technique [0002] Current measurement probes typically measure the current of a conductor by using a current sensing circuit to sense the magnetic flux generated by the flow of current in the conductor. The current sensing circuit converts the sensed current signal into a voltage output signal coupled to a measurement test instrument such as an oscilloscope for display and analysis. Current sensing circuits generally have a transformer input, where the transformer has a toroidal core of magnetic material. The primary coil of a transformer is the conductor in which the current is measured and placed inside a toroidal core. The current in the primary coil induces a magnetic flux in the core. The secondary winding of the transformer wraps around the core and is coupled to a terminating...

AI Technical Summary

Problems solved by technology

[0007] However, in order to realize DC and low-frequency magnetic field detection, an air gap for installing the magnetoelectric converter 28 must be left in the magnetic core 12.

And the existence of this air gap reduces the high-frequency performance of the whole transformer 28

Therefore, it is not conducive to achieve better high frequency response

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