A magnetically modulated current sensor and its manufacturing method

A current sensor and magnetic modulation technology, which is applied in the direction of only measuring current, manufacturing measuring instruments, measuring current/voltage, etc., can solve the problems of magnetic field asymmetry of the excitation magnetic core, etc., to improve the filtering effect, suppress modulation noise, increase, etc. The effect of effective filter inductor value

Active Publication Date: 2021-08-13
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, the selected magnetic core with the same magnetic characteristics will still produce asymmetrical magnetic fields of the two excitation cores when the detection circuit passes the measured current, resulting in modulation noise

Method used

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  • A magnetically modulated current sensor and its manufacturing method
  • A magnetically modulated current sensor and its manufacturing method

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Embodiment Construction

[0023] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0024] Such as figure 1 Shown is a schematic diagram of a magnetically modulated current sensor according to one embodiment of the invention. The magnetic modulation current sensor can significantly reduce the modulation noise of the magnetic modulation current sensor without affecting the AC characteristics, and it includes: the first magnetic core C1 and the second magnetic core C2 stacked together to form an integral magnetic core with the same axis and the third magnetic core C3, wherein the first magnetic core C1, the second magnetic core C2 and the third magnetic core C3 are respectively wound with the first coil L1, the second coil L2 and the auxiliary coil L3, and the overall magnetic core is wound A primary coil Lp and a secondary coil Ls are made. The primary coil Lp receives the measured DC current or the measured AC current input from ...

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Abstract

The present invention provides a magnetic modulation current sensor, comprising: a first magnetic core, a second magnetic core and a third magnetic core, respectively wound on the first coil and the second coil of the first magnetic core and the second magnetic core; an auxiliary coil formed on the third magnetic core or the integral magnetic core; a primary coil and a secondary coil wound on the integral magnetic core; an excitation signal generating unit connected to both the input ends of the first coil and the second coil; and The input terminal is connected to the second coil and the auxiliary coil, and the output terminal is connected to the current compensation unit of the secondary coil; the equivalent single-turn inductance of the first magnetic core and the second magnetic core are consistent, and the equivalent single-turn inductance of the third magnetic core The turn inductance is larger than the first magnetic core and the second magnetic core. According to the transformer model of the modulation signal, the magnetic modulation current sensor of the present invention increases the equivalent filter inductance value of the secondary winding by making the equivalent single-turn inductance of the third magnetic core greater than that of the first and second magnetic cores, thereby improving Filtering effect of excitation noise. The modulation noise of the current sensor is thereby suppressed.

Description

technical field [0001] The invention relates to a current sensor and a manufacturing method thereof, in particular to a magnetic modulation current sensor and a manufacturing method thereof. Background technique [0002] High-precision AC-DC current sensor (DCCT) is widely used in many fields such as accelerators, medical treatment, scientific research, and measurement due to its high measurement accuracy, wide frequency bandwidth, and electrical isolation, and has broad application prospects. Accurate detection and control of DC current in DC transmission system, frequency conversion speed control device, UPS power supply, inverter welding machine, electrolytic plating, CNC machine tool, microcomputer monitoring system, accelerator operation, power grid monitoring system and in various fields that require isolation and detection of current , is the fundamental guarantee for the safe and reliable operation of the equipment and the first problem to be solved. [0003] Magnet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R3/00
CPCG01R3/00G01R19/0092
Inventor 朱燕燕王东兴李瑞
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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