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High-attenuation ultra-small common mode conduction electromagnetic interference active filter

A technology for conducting electromagnetic interference and source filters, which is applied to electrical components, output power conversion devices, multi-terminal-to-network, etc. It can solve the problems of bulky passive EMI filters, no EMI filters, and complicated design and production processes. , to achieve the effect of improving dynamic response and frequency response capability, light weight and convenient design

Active Publication Date: 2008-07-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The passive EMI filter composed of passive components such as inductors and capacitors that is widely used at present is bulky, the filtering effect is not good, and the design and production process is complicated, and it is easy to generate resonance
According to the data search conducted by the applicant, there are no products and related reports about EMI filters composed of active components such as operational amplifiers

Method used

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  • High-attenuation ultra-small common mode conduction electromagnetic interference active filter
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  • High-attenuation ultra-small common mode conduction electromagnetic interference active filter

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Embodiment Construction

[0010] refer to figure 1 and figure 2 , the common-mode electromagnetic interference active filter of the present invention comprises a high-frequency common-mode electromagnetic interference current transformer, and 3 windings are wound on the circumference of the transformer, and the winding directions of the 3 windings are all in the same phase, wherein 2 windings They are respectively connected in series to the AC incoming line of the noise power supply equipment, that is, the live wire and the neutral wire, and the other winding is connected to the input terminal (negative terminal) of the operational amplifier A through a series resistor R1, and the input terminal of the operational amplifier A also has a resistor R2 ( plus end). The operational amplifier A works in an open-loop state, and its output is connected to two high-voltage ceramic capacitors C1 and C2 and a resistor R3. The high-voltage ceramic capacitors C1 and C2 connect the output signal to the live line a...

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Abstract

The invention discloses a high attenuation microminiaturte common mode transmission electromagnetic interference active filter, which includes ring high-frequency current-transformer, wherein three windings twine round the mutual-inductor; the coiling directions of three windings are the same; two windings connect the alternating current power lead-in end; another end connects the carry-in terminal of operational amplifier; the export of operational amplifier feedbacks signal to noise source device by two high-pressure capacitances and electric resistances. The filter has simple and reasonable structure, which has strong noise attenuation ability and good low-frequency filtering feature.

Description

technical field [0001] The invention belongs to the field of production and application of electromagnetic interference filters, and relates to a miniaturized active electromagnetic interference filter with high attenuation multiple. Background technique [0002] While power electronic devices are widely used and developed rapidly, the problem of electromagnetic interference (EMI) is becoming more and more serious. Especially in recent years, power converters are constantly moving towards high-frequency, high-efficiency, and high-power-density technologies. This is a huge challenge for how to effectively suppress the electromagnetic noise generated by switching devices. The passive EMI filter composed of passive components such as inductors and capacitors that is widely used at present is bulky, has poor filtering effect, and the design and production process is complicated, which is prone to resonance. According to the data retrieval conducted by the applicant, there are n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H03H11/12
Inventor 陈文洁杨旭王兆安
Owner XI AN JIAOTONG UNIV
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