Electromagnetic interference eliminating device

An electromagnetic interference and receiving device technology, applied in the field of electromagnetic interference elimination devices, can solve problems such as EMAT system noise, false detection, and affecting the receiving effect of the detection circuit, and achieve common-mode noise elimination, high input impedance, and high common-mode rejection ratio Effect

Inactive Publication Date: 2018-04-13
周燕红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The excitation system of the electromagnetic ultrasonic testing system needs a high-power current to excite the transmitting signal, and the transmitting circuit generates pulsed electromagnetic interference that will be dominated by common-mode noise. The generated electromagnetic interference is easily coupled into the electromagnetic ultrasonic receiving circuit through air coupling, resulting in serious problems Noise, so that the received signal is submerged in the noise signal, which will affect the receiving effect of the detection circuit and cause false detection, seriously affecting the reliability of the receiving system

Method used

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Examples

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Embodiment

[0033] figure 1 This is a structural block diagram of an electromagnetic interference cancellation device provided by an embodiment of the present invention. This embodiment can be applied to situations where common mode noise mainly affects the signal transmission of the system by electromagnetic interference. The electromagnetic interference cancellation device may specifically include:

[0034] The receiving device 10 is used for receiving the input signal of the electromagnetic interference cancellation device.

[0035] Taking a receiving device of electromagnetic ultrasound technology as an example, the receiving device 10 may be a receiving coil, the shape of the receiving coil is related to the type of electromagnetic ultrasonic wave received, and the line spacing of the receiving coil is related to the frequency of the received electromagnetic ultrasonic wave.

[0036] The amplitude limiting module 20 is used for limiting the amplitude of the input signal received by the recei...

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Abstract

The invention discloses an electromagnetic interference eliminating device. The electromagnetic interference eliminating device carries out amplitude limiting protection on an input signal through anamplitude limiting module. A pre-amplification module is used to amplify a signal output by the amplitude limiting module and reduce the noise coefficient of the output signal of the amplitude limiting module. The input signal gains through an amplifier and a filter module, and a disturbing signal is filtered out, and finally a phase shift module carries out constant amplitude phase adjustment onthe phase. The electromagnetic interference eliminating device has the characteristics of high speed, high common mode rejection ratio, high input impedance, low noise and the like, and can effectively eliminate common mode noise.

Description

Technical field [0001] The embodiment of the present invention relates to the technical field of electromagnetic interference elimination, in particular to an electromagnetic interference elimination device. Background technique [0002] With the development of the electronics industry, any electronic device may become a radiation interference source with antenna characteristics, which can emit electromagnetic waves and affect the normal operation of other systems or other subsystems in the system. In equipment that requires high-power excitation, electromagnetic interference generated by the excitation easily enters the system through coupling, causing serious noise in the system, causing the excited signal to be submerged in the noise signal, and seriously affecting the reliability of the system. For example, as a non-contact flaw detection technology, the electromagnetic ultrasonic (Electromagnetic Acoustic Transducer, EMAT) technology has broad application prospects under har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H02M1/44
CPCH04B1/10H02M1/44H04B1/1027H04B1/1036
Inventor 周燕红
Owner 周燕红
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