Measuring method and device of pulse width detection type magnetic modulation direct current

A DC current and pulse width detection technology, applied in measuring devices, measuring current/voltage, measuring electrical variables, etc. Improve the accuracy and stability, the effect of excitation stability

Active Publication Date: 2015-04-01
漳州市东南电子技术研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the influence of these factors, the test range that can be realized by the existing method is not greater than the range of 1mA-100mA, and the error can only be about 3%.
In fact, it is not suitable for making DC clamp ammeter

Method used

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  • Measuring method and device of pulse width detection type magnetic modulation direct current
  • Measuring method and device of pulse width detection type magnetic modulation direct current
  • Measuring method and device of pulse width detection type magnetic modulation direct current

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Embodiment Construction

[0054] figure 1 The dashed frame 1 is the excitation signal source, which includes the square wave signal generator Vs, the coupling capacitor C, the resonance capacitor C1, and the current sampling resistor R; the dashed frame 2 is the magnetic sensor, which includes the magnetic core M, the excitation coil N1, and the correction coil N2 and detection coil No; the dashed frame 3 is the standard current source Is and its control switch K. The duty ratio of the square wave signal Vs generated by the square wave generator is 1:1, and the frequency can be adjusted within the range of 1-10KHz; it is fed to the resonance capacitor C1, the excitation coil N1, and the current sampling resistor R through the coupling capacitor C. The excitation circuit of the square wave generator; adjust the frequency of the square wave generator to make the excitation circuit in an off-resonance, at this time, it is easy to get a better pulse width modulation effect. The voltage waveform generated b...

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Abstract

The invention provides a measuring method and a device of pulse width detection type magnetic modulation direct current, comprising a magnetic modulation circuit, a magnetic sensor, a pulse width measuring and magnetic characteristic modifying circuit and a method, and the size and direction of the direct current to be measured are reflected through the variation of the pulse width of the pulse generated by measuring the magnetic modulation circuit. The working frequency of the adopted magnetic modulation signal is far higher than the power frequency, thus the interference of power frequency is avoided; the outside of the magnetic sensor is provided with a magnetic shielding case, which can effectively lower the influence of earth magnetic field and external interference magnetic field on the test, and magnetic characteristic modification measures are adopted. The method and device possess higher sensitivity, stronger capability of resisting interference, can effectively reduce the influence of magnetic material nonlinearity, and improve test precision and stability.

Description

Technical field [0001] The invention relates to a direct current measurement technology, in particular to a pulse width detection type magnetic modulation direct current measurement method and a direct current measurement device adopting the method. Background technique: [0002] The existing CN1195108, 98106874.X patent and its related technical paper "A New Magnetic Modulation DC Current Measurement Method" discloses a DC current detection method that uses a magnetic modulation circuit and phase difference detection technology to form a DC current measurement method. It uses a triangular wave current to excite the soft magnetic core; it takes the positive and negative half-wave phase changes in the output information of the modulator as the measurement object to achieve the purpose of DC current measurement. This method involves complex positive and negative half-wave separation and phase difference detection technology. The output phase signal is not only related to the detect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 徐先
Owner 漳州市东南电子技术研究所有限公司
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