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Clamp type direct current sensor

A DC current and sensor technology, applied in the direction of measuring current/voltage, instruments, measuring electrical variables, etc., can solve the problems of increased linearity error and low measurement accuracy, and achieve the elimination of nonlinear errors, large-scale DC current non-contact online measured effect

Inactive Publication Date: 2006-07-12
王清波 +1
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AI Technical Summary

Problems solved by technology

The existing non-contact methods for measuring DC current can be roughly divided into two types. One is to use a Hall sensor plus a current transformer. Due to the large temperature drift and zero point drift of the Hall sensor, the measurement accuracy is not high, and usually only For the measurement of large current (ampere level)
Another method is to use the principle of magnetic modulation, but limited by the measurement principle, this method is usually used to measure small currents of microampere or milliampere level. As the measured DC current increases, its linearity error also increases. increase

Method used

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Embodiment Construction

[0013] As shown in the figure, the clamp-type DC current sensor of the present invention includes a clamp-type magnetic core, and an excitation winding W1, a measurement winding W2 and a feedback winding W4 are respectively wound on the clamp-type magnetic core; the excitation winding W1 is electrically connected to the output end of the excitation circuit composed of the triangular wave generating circuit and the power amplification driving circuit A1; the measurement winding W2 is electrically connected to the input end of the detection circuit; the feedback winding W4 is electrically connected to the output end of the detection circuit; The detection circuit is composed of a signal conditioning circuit, a single-chip microcomputer 8051, a D / A conversion circuit, and a power amplifier driving circuit A2; the feedback winding W4 is electrically connected to the input terminal of the current sampling circuit. The output end of the signal conditioning circuit is electrically con...

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Abstract

The invention discloses a clamp-type dc sensor, which comprises: a clamp-type magnetic core with an exciting winding W1 connected to the output end of an excitation circuit contained a triangular-wave generator and a power amplification push circuit A1, a measurement winding W2 and a feedback winding W4 electric connected with the input / output end of a detection circuit, respectively; and a detection circuit with a signal modulating circuit, a SCM 8051, a DAC, and a power amplification push circuit A2. This invention realizes non-contact online measurement for dc with high accuracy and large range.

Description

technical field [0001] The invention relates to a direct current sensor, in particular to a clamp type direct current sensor. Background technique [0002] In industrial automation systems, many DC system circuits need to measure the magnitude of the current, and the conventional method of measuring DC current is series measurement, that is, first disconnect the DC circuit and then connect the ammeter to the DC circuit for measurement. But in many application fields, this kind of series connection is not allowed, such as railway signal system, disconnecting the circuit will cause train stoppage or even accident. Therefore, the use of non-contact measurement is a way to solve the problem. The existing non-contact methods for measuring DC current can be roughly divided into two types. One is to use a Hall sensor plus a current transformer. Due to the large temperature drift and zero point drift of the Hall sensor, the measurement accuracy is not high, and usually only It is ...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 张兴杰王清波
Owner 王清波
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