Method for Measuring DC Current or DC Voltage Using Magnetically Excited Resonant Piezoresistive Cantilever Beam
A DC voltage and DC current technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problems of non-digital signal output sensitivity, etc., and achieve the effects of simple production, energy reduction and high sensitivity
Active Publication Date: 2015-12-02
XI AN JIAOTONG UNIV
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a method for measuring DC current or DC voltage using a magnetically excited resonant piezoresistive cantilever beam, and realize the measurement of DC current or DC voltage by detecting the resonant frequency of the cantilever beam, so as to solve the problem of existing DC The current or DC voltage measurement method outputs non-digital signals or the output sensitivity is too low, etc.
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[0020] Below in conjunction with accompanying drawing, the working process of the method that the present invention adopts magnetically excited resonant piezoresistive cantilever beam to measure direct current is described in more detail:
[0021] see figure 1 As shown, the present invention adopts the magnetically excited resonant piezoresistive cantilever beam to measure the method for direct current comprising the following steps:
[0022] 1) Place the cantilever beam 11 in an external uniform magnetic field, the direction of the uniform magnetic field is along the length direction of the cantilever beam 11, and then give it to the excitation coil on the cantilever beam 11 through the first and second pads 1 and 2 10 provides a sinusoidal AC voltage, and the cantilever beam 11 will undergo reciprocating vibration when subjected to alternating electromagnetic force;
[0023] 2) The vibration of the cantilever beam 11 is sensed by the piezoresistive Wheatstone bridge 9 place...
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The invention provides a method for measuring direct current or direct voltage by adopting a magnetic excitation resonant piezoresistive cantilever beam. According to a work equation between frequency shift of the cantilever beam and corresponding current or direct current, the measurement of the direct current or the direct voltage can be achieved, wherein the direct current or the direct voltage passes through the cantilever beam in the front and at the back of a Wheatstone bridge. According to the method, by virtue of high efficiency of magnetic excitation, the energy required by excitation can be reduced remarkably; with the adoption of piezoresistance conversion, the cantilever beam processing is simple in manufacturing, and a signal processing circuit is easy to operate; and an output signal is an accurate digital signal, and the sensitivity is high.
Description
technical field [0001] The invention relates to a method for measuring direct current or direct voltage, more precisely, a method for measuring direct current or direct voltage by using a magnetically excited resonant piezoresistive cantilever beam. Background technique [0002] Current sensors have been widely used in modern power electronic systems and play a very important role in monitoring and protecting power systems. There are many methods for measuring current, typical ones are based on Hall effect, fluxgate, magnetoresistance, fiber optic technology, ohm resistance law, lead resistance technology, Rogowski coil, current transformer, polarization detection, interferometer detection , magnetic induction and other principles. With the development of MEMS technology and the trend of integration of power electronic modules, a method of measuring DC or AC current based on piezoelectric micro-cantilever beams has recently appeared. In order to facilitate the digital cont...
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IPC IPC(8): G01R19/00
Inventor 蒋庄德张桂铭赵立波徐龙起赵玉龙王苑王久洪苑国英
Owner XI AN JIAOTONG UNIV