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Current sensor

A technology of current sensors and resistors, applied in voltage/current isolation, measuring current/voltage, instruments, etc., can solve the problems of calculation result error and non-independence, and achieve the effects of low power consumption, convenient maintenance, and light weight

Inactive Publication Date: 2006-02-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, its feedback windings are connected in series, and each Hall element is equivalent to a series structure, so each Hall element is interrelated and not independent; moreover, the output of each channel is simply added to obtain the total measurement As a result, once the sensor of a certain channel is blocked or necrotic, the calculation result will have a large error

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Embodiment Construction

[0025] Depend on figure 1 As shown, 1 is a display, 2 is a computer for processing detection voltage signals from four parallel channels; 3 to 6 are Hall voltage filtering, voltage-current conversion, and current amplification circuits of four parallel channels; A 1 ~A 4 is the operational amplifier; 7 is the dedicated ground layer; 8 is the measured current bus; R s1 ~R s4 Sampling resistance for four parallel channels; I f1 ~I f4 is the feedback current of four parallel channels; U s1 ~ U s4 is the terminal voltage corresponding to the sampling resistor; H 1 ~H 8 For eight Hall elements; U H1 ~ U H8 Hall voltage output by eight Hall elements; W 1 ~W 8 Eight Rogowski coil feedback windings for the channel; the * sign indicates the same-named end of the Rogowski coil feedback winding.

[0026] An air gap is set in the diameter direction of the iron core, the length of the iron core of each channel is equal, the air gap is evenly distributed, and the Hall element is...

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Abstract

The invention discloses a kind of current sensor, which includes multi-channel and multi-air-gap ring iron core, a Hall element. The character lies in: the feedback windings in the symmetrical channels are connected together in series according to Rogowski coil mode, one end is accessed to the ground, the other end is accessed to one end of the correspondent sampling resistance; in the two symmetrical channels, the two symmetrical Hall elements are a group in the two channels, each Hall element is controlled by a constant current power, the outputs of the two Hall elements are amplified by the amplifier, then carries on filter, voltage-current transform, current amplifying process. The output end is accessed to another end of the sampling resistance, the detected voltage signal at two ends of the sampling resistance is transmitted to the computer to be processed, and the current is displayed on the monitor. The invention improves the saturate and linearity of the sensor; the accuracy is more than 0.5%, the power consumption is small, the temperature additional error is less than 0.1% / 10 degrees centigrade, the structure is simple, and easy to be assembled, debugged and maintained.

Description

Technical field: [0001] The invention relates to a current sensor, in particular to a sensor for measuring a large direct current. Background technique [0002] At present, no matter in the fields of electrolysis in metallurgy and chemical industry, electroplating in mechanical industry, electric locomotive and power system, or in nuclear physics, high-power electronics and other disciplines, the problem of DC large current measurement is involved, and it is often in the in a high pressure environment. Therefore, the problem of measuring DC large current has become an indispensable and important part in the field of electromagnetic measurement technology. [0003] Due to the vigorous development of industries such as metallurgy, chemical industry and high-voltage direct current transmission (HVDC), the power consumption of direct current is increasing. The measurement of DC large current is an urgent problem to be solved at present, and it has a great influence on energy s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/20G01R19/00
Inventor 毛承雄李维波陆继明
Owner HUAZHONG UNIV OF SCI & TECH