Research on sensor amplification circuit for magnetic field detection of power equipment
A technology for amplifying circuits and power equipment, applied to the magnitude/direction of magnetic fields, components of electrical measuring instruments, improving amplifiers to reduce noise effects, etc., can solve the problem of reducing high and low frequency output gains, low application frequency bands, and large amplifier output voltages Dynamic range and other issues, to achieve the effect of smooth amplitude-frequency characteristic and phase-frequency characteristic curve, maintain safe operation, and reduce cable accidents
Pending Publication Date: 2020-11-10
TIANJIN UNIV
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Problems solved by technology
The circuit form of the proportional amplifier circuit is simple, and the applied sensor frequency band is lower than the sensor resonant frequency side, but when the frequency reaches several hundred Hz, there will be a larger dynamic range of the amplifier output voltage
The integral amplifier circuit also has the advantage of simple circuit form, but there is also the problem that the application frequency band is lower than the resonance frequency
In addition to using the compensation circuit, connecting matching resistors in parallel at both ends of the coil can also improve the amplitude-frequency characteristics at the resonance point, thereby increasing the frequency detection range, but this will also increase the resistance thermal noise of the coil and reduce the output gain of high and low frequencies. There is a limit to the improvement of amplitude-frequency characteristics
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[0036] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0037] 1. Description of the amplifier circuit:
[0038] image 3 It is an enlarged circuit diagram drawn in Multisim. Given that the simulated coil induced voltage is 10 -1 V order of magnitude, the amplification factor G of the amplifier circuit is designed to be 33, the amplification will be realized by two amplification links of pre-amplification and secondary amplification, both of which use the same phase proportional ampl...
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The amplifying circuit based on flux negative feedback is designed by using Multisim circuit simulation software, an amplitude-frequency characteristic curve and a phase-frequency characteristic curveof the amplifying circuit are analyzed, and the reliability of the amplifying circuit is verified. The research result can be used for amplifying the induced voltage at the two ends of the inductioncoil of the magnetic field sensor, widening the measurement frequency of the sensor and improving the sensitivity of the magnetic field sensor, and has great significance in maintaining the stable operation of the power cable, maintaining the online detection of the cable and maintaining the safe and stable operation of the power grid in China.
Description
technical field [0001] The invention relates to the design of an amplifying circuit for a magnetic field sensor based on Faraday's law of electromagnetic induction, wherein an amplifying circuit based on magnetic flux negative feedback is proposed. Background technique [0002] Power cables are widely used in power grids because of their stable transmission performance, good insulation performance, high temperature resistance, convenient laying, and simple operation and maintenance. In the construction of urban power grids, it has gradually replaced overhead lines and oil-paper insulated cables. In order to detect the running state of the cable online, a magnetic field sensor based on the law of electromagnetic induction is proposed. The magnetic field generated by the power cable is weak, and the induced voltage generated on the induction coil after the alternating magnetic field passes through the magnetic core is weak, so the output voltage is also weak. In order to ena...
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IPC IPC(8): G01R33/02G01R31/58G01R1/30H03F1/26
CPCG01R33/02G01R31/58G01R1/30H03F1/26
Inventor 刘勇黄兴旺宗红宝李琪冉董学家王志会王豪
Owner TIANJIN UNIV
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