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A broadband common-mode inductor and an isolation circuit comprising a broadband common-mode inductor

A technology of isolation circuit and common mode inductance, applied in the direction of inductance with magnetic core, logic circuit connection/interface layout, transformer/inductor coil/winding/connection, etc., can solve the problem of unsatisfactory high frequency characteristics of differential mode signal, etc. problems, to achieve good resistance to high-frequency and high-speed common mode interference, good high-frequency characteristics, and small differential mode leakage resistance.

Inactive Publication Date: 2016-04-27
HANGZHOU CHEELE ELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a broadband common-mode inductor with small differential-mode leakage reactance and good high-frequency characteristics for differential-mode signals; it solves the technical problem of unsatisfactory high-frequency characteristics for differential-mode signals in common-mode inductors in the prior art

Method used

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  • A broadband common-mode inductor and an isolation circuit comprising a broadband common-mode inductor
  • A broadband common-mode inductor and an isolation circuit comprising a broadband common-mode inductor
  • A broadband common-mode inductor and an isolation circuit comprising a broadband common-mode inductor

Examples

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Embodiment 1

[0034] Such as image 3 and 4 As shown, a broadband common mode inductor includes an annular magnetic ring 11, and a coaxial cable 10 is wound outside the annular magnetic ring 11. The diameter of the magnetic ring is 10 mm, the height of the magnetic ring is 5 mm, the diameter of the coaxial cable is 2 mm, and the frequency band is 800 MHz. The coaxial cable 10 has two connection ends, and each connection end includes an outer terminal of the core wire and an outer terminal of the shielding layer, and the outer terminal of the core wire is located inside the outer terminal of the shielding layer. The first core wire external terminal 12 at one end of the coaxial cable 10 and the second core external terminal 14 at the other end of the coaxial circuit form a first winding, and the first shielding layer external terminal 13 at one end of the coaxial cable 10 is connected to the The external terminal of the second shielding layer at the other end constitutes the second winding...

Embodiment 2

[0036] Such as Figure 5 As shown, an isolation circuit resistant to high-frequency and high-speed common-mode interference includes an isolation power supply 31, an input terminal 2 of the isolation circuit, a reference point 3 of the input terminal of the isolation circuit, an output terminal 4 of the isolation circuit, and a reference point 5 of the output terminal of the isolation circuit , the output reference point 5 is connected to the reference ground 9. The isolated power supply 31 is connected to the isolation circuit 1, and a capacitor 7 is formed on both sides of the isolation layer 6 of the isolation circuit 1, and the first broadband common mode inductor 16 is connected to the input end of the isolation circuit, and the input end 2 of the isolation circuit and the isolation circuit A terminal resistor 20 is connected between the reference points 3 of the circuit input terminals. The structure of the first broadband common mode inductor 16 is as described in Embo...

Embodiment 3

[0038] Such as Figure 7 As shown, for applications such as isolated channel oscilloscopes and oscilloscope isolated probes, the input impedance is particularly high and the input capacitance is particularly low. The coaxial cable usually wound with a broadband common mode inductor can only be controlled within a few centimeters in length. At this time, if the common-mode inductance is not enough to provide sufficient high-frequency and high-speed common-mode rejection capability, another broadband common-mode inductance can be further connected to the output terminal of the isolation amplifier.

[0039] It includes an isolated power supply 31 , an input end 2 of the isolation circuit, a reference point 3 of the input end of the isolation circuit, an output end 4 of the isolation circuit, and a reference point 5 of the output end of the isolation circuit. The isolated power supply 31 is connected to the isolation circuit 1, and a capacitor 7 is formed on both sides of the iso...

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Abstract

The invention relates to electronic measuring equipment, in particular to a broadband common mode inductor and an isolating circuit comprising the broadband common mode inductor. The isolating circuit comprises an isolating power supply, an input end of the isolating circuit, an input end reference point of the isolating circuit, an output end of the isolating circuit, and an output end reference point of the isolating circuit, wherein the input end or the output end of the isolating circuit is connected with the broadband common mode inductor. The broadband common mode inductor comprises a magnetic core, wherein a coaxial cable is wound on the magnetic core. The broadband common mode inductor is small in differential mode leakage reactance, has good high-frequency characteristic on a differential mode signal, and solves the technical problem that the high-frequency characteristic of the common mode inductor on the differential mode signal is not ideal in the prior art.

Description

technical field [0001] The invention relates to an electronic measuring device, in particular to a signal isolation circuit for resisting high-frequency and high-speed common-mode interference and a wide-band common-mode inductance device in the circuit. Background technique [0002] The isolation circuit can transfer the electrical signal from the input side to the output side, but the input side and the output side are electrically isolated, or insulated, and there is only a small capacitance between the input side and the output side. [0003] The isolation circuit can improve the common mode rejection ratio during measurement, reduce interference, improve signal quality, and can also isolate dangerous voltages to protect equipment and personal safety. When measuring multiple channels at the same time, the isolation circuit can also prevent short-circuit accidents caused by common ground between channels. [0004] As the society pays more and more attention to energy con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F17/06H01F27/28H03K19/0175
Inventor 李君温志伟
Owner HANGZHOU CHEELE ELECTRONICS
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