CN103337336B - A kind of broadband common mode inductor and comprise the buffer circuit of broadband common mode inductor - Google Patents
A kind of broadband common mode inductor and comprise the buffer circuit of broadband common mode inductor Download PDFInfo
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- CN103337336B CN103337336B CN201210196729.1A CN201210196729A CN103337336B CN 103337336 B CN103337336 B CN 103337336B CN 201210196729 A CN201210196729 A CN 201210196729A CN 103337336 B CN103337336 B CN 103337336B
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Abstract
The present invention relates to a kind of electronic metering equipment.A kind of broadband common mode inductor and comprise the buffer circuit of broadband common mode inductor, comprise insulating power supply, the input of buffer circuit, buffer circuit input reference point, the output of buffer circuit and buffer circuit output reference point, be connected with broadband common mode inductor at the input of buffer circuit or output.Broadband common mode inductor, comprises magnetic core, and magnetic core is wound with coaxial cable.The invention provides a kind of differential mode leakage reactance little, difference mode signal is had to the broadband common mode inductor of good high frequency characteristics; Solve the technical problem undesirable for the high frequency characteristics of difference mode signal that in prior art, common mode inductance exists.
Description
Technical field
The present invention relates to a kind of electronic metering equipment, particularly relate to the broadband common mode inductor device in a kind of signal isolation circuit of anti-high-frequency high-speed common mode disturbances and circuit thereof.
Background technology
Buffer circuit can by the electrical signal transfer of input side to outlet side, but be isolation between input side and outlet side on electrically, or perhaps insulation, the electric capacity that between input side and outlet side, only existence one is less.
Buffer circuit can improve common-mode rejection ratio during measurement, reduces interference, improves signal quality, also can completely cut off dangerous voltage, proterctive equipment and personal safety.When multichannel is measured simultaneously, buffer circuit can also prevent the short circuit accident because interchannel causes altogether.
Along with society is to the more and more attention of energy-conserving and environment-protective, the use that efficiently can process the power electronic equipment of electric energy is more and more extensive.One of feature of power electronic equipment is often containing HF switch pulse.When controlling these equipment, test and debug, often need to use buffer circuit.Although buffer circuit itself can improve common-mode rejection ratio during measurement to a certain extent, reduce interference, but owing to there is the electric capacity of one between buffer circuit input side and outlet side all the time, although numerical value is smaller, but still Low ESR is presented to high-speed common mode pulse, common mode disturbances can be coupled in differential mode output signal, output signal is distorted, obtain the measurement result of mistake, or make subsequent conditioning circuit misoperation.
As shown in Figure 1, input difference mode signal Vd is connected between the input 2 of buffer circuit 1 and the input side reference point 3 of buffer circuit 1, obtains the differential mode output signal after isolating between the output 4 and outlet side reference point 5 of buffer circuit 1.Separator 6 both sides of buffer circuit 1 form an electric capacity 7.Usual input signal has potential difference, i.e. common-mode voltage Vc with reference to ground 8 and outlet side with reference between ground 9.This common-mode voltage Vc is directly added on isolation barrier 6, and also namely Vc is directly added on electric capacity 7, sees equivalent electric circuit Fig. 2.Although electric capacity 7 is usually less, generally at several pF to tens of pF, is Low ESR to the common-mode signal of high dV/dt, makes high-speed common mode signal can be coupled to the outlet side of buffer circuit, disturb output difference mode signal.
For low bandwidth buffer circuit, difference mode signal frequency is lower, can at output side joint low pass filter, filtering or weaken high-frequency high-speed common mode disturbances.For high-speed isolated circuit, comprise digital buffer circuit and broadband analogue buffer circuit, need the difference mode signal in process high speed, broadband, just can not add low-pass filtering at outlet side, therefore be difficult to remove high-frequency high-speed common mode disturbances.
Summary of the invention
The invention provides a kind of differential mode leakage reactance little, difference mode signal is had to the broadband common mode inductor of good high frequency characteristics; Solve the technical problem undesirable for the high frequency characteristics of difference mode signal that in prior art, common mode inductance exists.
The present invention also provides a kind of anti-high-frequency high-speed common mode disturbances ability strong simultaneously, the ability of especially pulse common mode disturbances is good, when buffer circuit is worked under high-frequency high-speed common mode disturbances environment, can obtain totally, accurately broadband differential mode output signal, the buffer circuit of the applicable broadband common mode inductance that can use in many occasions; When solving the high-frequency high-speed environment use existed in prior art, be difficult to removing interference, the technical problem that output effect is undesirable.
Above-mentioned technical problem of the present invention is solved by following technical proposals: a kind of broadband common mode inductor, comprises magnetic core, and magnetic core is wound with coaxial cable.Numeral buffer circuit or broadband analogue buffer circuit, difference mode signal bandwidth from direct current to hundreds of more than MHz, especially analog isolation circuit, input signal amplitude may be fainter, has again strong common mode disturbances to affect, need a kind of high bandwidth, full-shield, the broadband common mode inductor of impedance matching.For this reason, select coaxial cable as wire, coaxial cable itself has high bandwidth, full-shield, and the characteristic of impedance matching adds the close-coupled of heart yearn and screen, makes the differential mode leakage reactance of common mode inductance very little, has good high frequency characteristics to difference mode signal.By coaxial cable around on magnetic core, normally use magnet ring, the common mode inductance value of less volume and Geng Gao can be obtained.
The shape of magnetic core can be rectangle, U, E, I shape etc., and as preferably, described magnetic core is toroidal core, and described coaxial cable is BBC (broadband coaxial cable), and coaxial cable comprises heart yearn and screen.The magnetic core of annular can obtain higher inductance value under smaller size smaller, and the heart yearn of coaxial cable connects signal, and coaxial cable shielding layer connects with reference to ground.
As preferably, described magnetic core is annular, and the diameter of magnetic core is less than 20mm, is highly less than 20mm, and the diameter of described coaxial cable is less than 4mm, and frequency band is greater than 100MHz.Select high magnetic permeability Mini-magnetic ring and the little coaxial cable of external diameter, available shorter cable obtains enough common mode inductance amounts.
According to wherein a kind of buffer circuit of the anti-high-frequency high-speed common mode disturbances that above-mentioned broadband common mode inductor is formed, comprise insulating power supply, the input of buffer circuit, buffer circuit input reference point, the output of buffer circuit and buffer circuit output reference point, be connected with the first broadband common mode inductor at the input of buffer circuit; First heart yearn external terminal of the first broadband common mode inductor is connected with difference mode signal input, second heart yearn external terminal of the first broadband common mode inductor is connected with the input of buffer circuit, first screen external terminal of the first broadband common mode inductor is connected with difference mode signal input with reference to ground, and the secondary shielding layer external terminal of the first broadband common mode inductor is connected with buffer circuit input reference point.After input adds broadband common mode inductor, common-mode voltage has no longer directly been added between the input reference point of buffer circuit and output reference point, but applies via the broadband common mode inductor of series connection.Common mode inductance allows direct current to pass through to the broadband difference mode signal of hundreds of more than MHz, but is high impedance to high-frequency high-speed common-mode signal.The electric capacity of the two ends formation of buffer circuit is connected with broadband common mode inductor and is caused series resonance, usual series resonance frequency design is in lower frequency, and buffer circuit has high rejection ability to low frequency common interference usually, even if common mode inductance and electric capacity produce resonance, the common-mode voltage on electric capacity is amplified, also can not produce significantly interference to output difference mode signal.
As preferably, at the input of buffer circuit and the indirect terminal resistance of buffer circuit input reference point.Can mate with coax impedance, improve the stability of circuit.
In some applications, buffer circuit outlet side is earth-free, such as battery powered hand-held scopememter.Now outlet side circuit stray capacitance over the ground, still can make high frequency common mode disturb circulation.As preferably, the output reference point of described buffer circuit is connected with stray capacitance, and stray capacitance is connected with buffer circuit, input broadband common-mode circuit.Stray capacitance numerical value is smaller over the ground for output, compared with buffer circuit output head grounding situation, can reduce the voltage on the electric capacity being applied to buffer circuit formation, reduce common mode disturbances, after access band common mode inductance, then can high frequency common mode be suppressed further to disturb.
If add output common mode inductance enough suppress common mode disturbances, then can save the broadband common mode inductor of input.Buffer circuit described as follows: comprise insulating power supply, the input of buffer circuit, buffer circuit input reference point, the output of buffer circuit and buffer circuit output reference point, be connected with the second broadband common mode inductor at the output of buffer circuit, insulating power supply is connected with common mode inductance; First heart yearn external terminal of the second broadband common mode inductor is connected with the output of buffer circuit by impedance matching resistor, second broadband common mode inductor second heart yearn external terminal is connected with the difference mode signal output after isolation, first screen external terminal of the second broadband common mode inductor is connected with buffer circuit output reference point, and the second broadband common mode inductor secondary shielding layer external terminal is connected with buffer circuit difference mode signal and exports with reference to ground.For the application of the aspects such as oscilloscope channel isolation and oscilloscope isolation probe, require input impedance high especially, input capacitance is low especially.The common mode inductance that DC power supply connects with the common mode inductance in common power loop, but can need larger common mode inductance amount, to obtain good effect, insulating power supply can certainly be adopted independently powered battery, can save common mode inductance.
For the application of the aspects such as oscilloscope channel isolation and oscilloscope isolation probe, require input impedance high especially, input capacitance is low especially.Then the coaxial cable of coiling broadband common mode inductor can only control the length at several centimetres usually.If now common mode inductance amount is still not enough to provide enough high-frequency high-speed common mode inhibition capacity, then can all connect a broadband common mode inductor at isolated amplifier input and output further.As preferably, the first broadband common mode inductor is connected with at the input of buffer circuit, first heart yearn external terminal of the first broadband common mode inductor is connected with difference mode signal input, second heart yearn external terminal of the first broadband common mode inductor is connected with the input of buffer circuit, first screen external terminal of the first broadband common mode inductor is connected with difference mode signal input with reference to ground, and the secondary shielding layer external terminal of the first broadband common mode inductor is connected with buffer circuit input reference point; At the input of buffer circuit and the indirect terminal resistance of buffer circuit input reference point.Because buffer circuit output impedance is lower, be generally 50 ohm, be connected to terminal resistance 22 prevent reflection after, output cable length is not limited, in volume and time delay allowed band, can be long.So just can obtain the larger broadband common mode inductor of common mode inductance amount.Under the equivalent capacity of identical buffer circuit, just better to the inhibition of high-frequency high-speed common mode interference signal.Input side broadband common mode inductor amount just can design smaller, and cable length can be shorter.
Another buffer circuit arranged side by side with such scheme, be applied to binary channels or multichannel, comprise multiple isolation branch circuit, the outlet side of multiple isolation branch circuit has identical buffer circuit output reference point, common-mode voltage is there is between the difference mode signal input of adjacent two isolation branch circuits, broadband common mode inductor is connected with at the input of each isolation branch circuit, first heart yearn external terminal of broadband common mode inductor is connected with the difference mode signal input in corresponding isolation branch circuit, second heart yearn external terminal of broadband common mode inductor is connected with the input in corresponding isolation branch circuit, first screen external terminal of broadband common mode inductor is connected with difference mode signal input with reference to ground, the secondary shielding layer external terminal of broadband common mode inductor is connected with the input reference point of corresponding isolation branch circuit, a terminal resistance is respectively connected with at the input of each buffer circuit and the indirect of buffer circuit input reference point.
Broadband common mode inductor of the present invention and the buffer circuit applying this inductance possess following advantage: broadband common mode inductor adopts coaxial cable, coaxial cable has high broadband, full-shield, the characteristic of impedance matching, add the close-coupled of heart yearn and screen, make the differential mode leakage reactance of broadband common mode inductor little, have good high frequency characteristics to difference mode signal.Broadband common mode inductor be applied in buffer circuit, make when input signal is fainter, still can obtain signal clearly and export, anti-high-frequency high-speed common mode disturbances ability is good.
Accompanying drawing explanation
The existing buffer circuit schematic diagram of Fig. 1.
Fig. 2 existing buffer circuit common mode interference signal loop equivalent electric circuit.
Fig. 3 broadband common mode inductor coiling of the present invention schematic diagram.
Fig. 4 be Fig. 3 square frame in enlarged diagram.
Fig. 5 input side of the present invention is connected to the buffer circuit of broadband common mode inductor.
Fig. 6 is the common mode interference signal loop equivalent electric circuit of Fig. 5.
Fig. 7 is the buffer circuit that input side of the present invention and outlet side are connected to broadband common mode inductor.
Fig. 8 is the common mode interference signal loop equivalent electric circuit of Fig. 7.
Fig. 9 is the buffer circuit that outlet side of the present invention is connected to described broadband common mode inductor.
The earth-free situation of Figure 10 buffer circuit of the present invention outlet side.
Figure 11 is the common-mode signal equivalent electric circuit of Figure 10.
Figure 12 is the situation that two buffer circuit outlet sides of the present invention have same reference point.
Figure 13 is the common-mode signal equivalent electric circuit of Figure 12.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical scheme of invention is described in further detail.
Embodiment 1:
As shown in Figures 3 and 4, a kind of broadband common mode inductor, comprises the magnet ring 11 of annular, has a coaxial cable 10 in the outer solderless wrapped connection of magnet ring 11 of annular.The diameter of magnet ring is 10mm, and the height of magnet ring is 5mm, and coaxial cable is diameter 2mm, frequency band 800MHz.Coaxial cable 10 has two links, and each link includes a heart yearn external terminal and a screen external terminal, and heart yearn external terminal is positioned at screen external terminal.Second heart yearn external terminal 14 of the first heart yearn external terminal 12 of coaxial cable 10 one end and the other end of coaxial circuit forms the first winding, the first screen external terminal 13 of coaxial cable 10 one end forms the second winding 15, two windings with the secondary shielding layer external terminal of the other end and forms broadband common mode inductor.
Embodiment 2:
As shown in Figure 5, a kind of buffer circuit of anti-high-frequency high-speed common mode disturbances, comprise insulating power supply 31, the input 2 of buffer circuit, buffer circuit input reference point 3, the output 4 of buffer circuit and buffer circuit output reference point 5, export reference point 5 and connect with reference to ground 9.Insulating power supply 31 is connected on buffer circuit 1, the both sides of the separator 6 of buffer circuit 1 form an electric capacity 7, the first broadband common mode inductor 16 is connected with, at the input 2 of buffer circuit and the indirect terminal resistance 20 of buffer circuit input reference point 3 at the input of buffer circuit.As described in Example 1, coaxial cable solderless wrapped connection, on magnetic core, forms the first winding 17 and the second winding 18 to the structure of the first broadband common mode inductor 16.The the first heart yearn external terminal 12 forming the first winding 17 is connected with the input of difference mode signal Vd, the the second heart yearn external terminal 14 forming the first winding 17 is connected with the input 2 of buffer circuit, the first screen 13 external terminal forming the second winding 18 is connected with the input of difference mode signal Vd with reference to ground 8, and the secondary shielding layer external terminal 15 forming the second winding 18 is connected with buffer circuit input reference point 3.After adding broadband common mode inductor, common-mode voltage Vc has no longer directly been added between the input reference point 3 of buffer circuit 1 and output reference point 5, but applies via the broadband common mode inductor of series connection.As shown in Figure 6, inductance 19 is common mode inductance amounts of Fig. 5 middle width strip common mode inductance 16.Electric capacity 7 is that in Fig. 5, the equivalent capacity between barrier both sides isolated by buffer circuit 1.In Fig. 6, on electric capacity 7, voltage is the second-order low-pass filter output valve of Vc.For the frequency outside this second-order low-pass filter passband, common-mode signal Vd frequency is higher, or dV/dt is larger, and the voltage magnitude on electric capacity 7 is less.Inductance capacitance series circuit may cause series resonance.Choose reasonable common mode inductance amount 19, then consider the loss of common mode inductance itself, and large inductance value and small capacitances value often in reality, can avoid inductance 19 and electric capacity 7 to produce excessive series resonance.Usual series resonance frequency design is at lower frequency, and buffer circuit has high rejection ability to low frequency common interference usually.Even if inductance 19 and electric capacity 7 produce resonance and amplified by the common-mode voltage on electric capacity 7, also obviously interference can not be produced to output difference mode signal.
Embodiment 3:
As shown in Figure 7, for the application of the aspects such as oscilloscope channel isolation and oscilloscope isolation probe, require input impedance high especially, input capacitance is low especially.Then the coaxial cable of coiling broadband common mode inductor can only control the length at several centimetres usually.If now common mode inductance amount is still not enough to provide enough high-frequency high-speed common mode inhibition capacity, then can export another broadband common mode inductor of termination at isolated amplifier further.
It comprises insulating power supply 31, the input 2 of buffer circuit, buffer circuit input reference point 3, the output 4 of buffer circuit and buffer circuit output reference point 5.Insulating power supply 31 is connected on buffer circuit 1, and the both sides of the separator 6 of buffer circuit 1 form an electric capacity 7, are connected with the first broadband common mode inductor 16 at the input of buffer circuit, connect the second broadband common mode inductor 21 at output.First broadband common mode inductor 16 is identical with the structure of the second broadband common mode inductor 21, all as described in embodiment 1.As described in first broadband common mode inductor 16 of input is as interior in embodiment 2 with the connection of buffer circuit, do not repeat them here.The first heart yearn end 12 in first winding 17 of the coaxial cable core wire formation of the second broadband common mode inductor of output is connected with buffer circuit input 4 through impedance matching resistor 22, and the second heart yearn end 14 of the first winding 17 of the second broadband common mode inductor of output is as the difference mode signal output after isolation.First screen external terminal 13 of the second winding 18 of the coaxial cable core wire formation of the second broadband common mode inductor of output is connected with buffer circuit output reference point 5, and the secondary shielding layer external terminal 15 of the second winding 18 is connected with reference to ground 9 with output.Insulating power supply 31 can not directly connect reference point 9, also needs to connect power supply through a common mode inductance 23.Common mode inductance 23 with the common mode inductance in common power loop, but can need larger common mode inductance amount, with the effect obtained.Also can use independently powered battery, common mode inductance 23 can be saved.
Common-mode signal loop equivalent electric circuit now as shown in Figure 8.Inductance 19 is common mode inductance amounts of Fig. 7 middle width strip common mode inductance 16.Inductance 24 is common mode inductance amounts of the broadband common mode inductor 21 in Fig. 7, and inductance 25 is insulating power supply common mode inductance amounts in Fig. 7.Electric capacity 7 is that in Fig. 7, the equivalent capacity between barrier both sides isolated by buffer circuit 1.Loop apart from outside 19 of input side broadband common mode inductor, the inductance be formed in parallel by the common mode inductance amount 24 of the broadband common mode inductor 21 of outlet side and the common mode inductance amount 25 of DC power supply common mode inductance 23 of having connected again.If by powered battery, power supply common mode inductance 25 can be there is no.
Because buffer circuit output impedance is lower, be generally 50 ohm, be connected to terminal resistance 22 prevent reflection after, output cable length is not limited, in volume and time delay allowed band, can be long.So just can obtain the larger broadband common mode inductor of common mode inductance amount.Identical isolation barrier equivalent capacity 7 times, just better to the inhibition of high-frequency high-speed common mode interference signal.Input side broadband common mode inductor amount just can design smaller, and cable length can be shorter.
Embodiment 4:
As shown in Figure 9, if add output common mode inductance enough suppress common mode disturbances, then the broadband common mode inductor 16 of input can be saved.The input impedance of such buffer circuit is just completely unaffected.This buffer circuit, comprise an insulating power supply, insulating power supply 31 is connected with a common mode inductance 23, at the input 2 of buffer circuit and the indirect terminal resistance 20 of buffer circuit input reference point 3, the input 2 of a wherein termination buffer circuit of difference mode signal Vd, another termination difference mode signal of difference mode signal Vd is with reference to ground 8.The second common mode inductance 21 is connected with at the output of buffer circuit 1.The first heart yearn end 12 in first winding 17 of the coaxial cable core wire formation of the second broadband common mode inductor of output is connected with buffer circuit input 4 through impedance matching resistor 22, and the second heart yearn end 14 of the first winding 17 of the second broadband common mode inductor of output is as the difference mode signal output after isolation.First screen external terminal 13 of the second winding 18 of the coaxial cable core wire formation of the second broadband common mode inductor of output is connected with buffer circuit output reference point 5, and the secondary shielding layer external terminal 15 of the second winding 18 is connected with reference to ground 9 with output.
Embodiment 5:
As shown in Figure 10, in some applications, buffer circuit outlet side is earth-free, such as battery powered hand-held scopememter.Now outlet side circuit stray capacitance over the ground, still can make high frequency common mode disturb circulation.Buffer circuit is connected with the first broadband common mode inductor at input, first heart yearn external terminal 12 of the first winding 17 of the first broadband common mode inductor is connected with the input of difference mode signal Vd, the the second heart yearn external terminal 14 forming the first winding 17 is connected with the input 2 of buffer circuit, first screen 13 external terminal of the second winding 18 of the first broadband common mode inductor is connected with the reference ground of difference mode signal Vd, and the secondary shielding layer external terminal 15 forming the second winding 18 is connected with buffer circuit input reference point 3.Buffer circuit 1 output reference point 5 is connected with stray capacitance 26 over the ground, the electric capacity 7 formed with separator 6 both sides of buffer circuit 1, input side broadband common mode inductor 16 is connected, its equivalent circuit Figure 11, stray capacitance 26 numerical value is smaller over the ground for outlet side, compared with buffer circuit outlet side Grounding, the voltage be applied on electric capacity 7 can be reduced, reduce common mode disturbances, after access band common mode inductance 16, then can high frequency common mode be suppressed further to disturb.Broadband common mode inductor is still effective in this applications.
Embodiment 6:
As shown in figure 12, for binary channels or multichannel application, several buffer circuit has same reference points at outlet side, and the first buffer circuit 1 output reference point 5 and the second buffer circuit 27 output reference point 28 link together.The second isolation capacitance 29 that second buffer circuit 27 is formed, and be connected to broadband the 3rd broadband common mode inductor 30 at input.First buffer circuit 1 differential input signal is Vd1, and the second buffer circuit 27 differential input signal is that Vd2, Vd1 and Vd2 may not have same reference point, then there is common-mode voltage Vc between Vd1 and Vd2, and its common-mode signal equivalent electric circuit as shown in figure 12.Inductance 32 is the common mode inductance amount of broadband common mode inductor 30.Electric capacity 7 and the voltage sum on electric capacity 29 are still the value of Vc after second-order low-pass filter, at the outer rapid decay of low-pass filtering passband.Therefore access band common mode inductance, still effective to the suppression of high frequency common mode interference.
Claims (10)
1. one kind comprises the buffer circuit of the anti-high-frequency high-speed common mode disturbances of broadband common mode inductor, it is characterized in that: comprise insulating power supply, the input of buffer circuit, buffer circuit input reference point, the output of buffer circuit and buffer circuit output reference point, be connected with the first broadband common mode inductor at the input of buffer circuit; First heart yearn external terminal of the first broadband common mode inductor is connected with difference mode signal input, second heart yearn external terminal of the first broadband common mode inductor is connected with the input of buffer circuit, first screen external terminal of the first broadband common mode inductor is connected with difference mode signal input with reference to ground, and the secondary shielding layer external terminal of the first broadband common mode inductor is connected with buffer circuit input reference point; First broadband common mode inductor comprises magnetic core, and magnetic core is wound with coaxial cable.
2. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 1, is characterized in that: at the input of buffer circuit and the indirect terminal resistance of buffer circuit input reference point.
3. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 1 and 2, is characterized in that: the output reference point of described buffer circuit is connected with stray capacitance, stray capacitance is connected with buffer circuit, input broadband common-mode circuit.
4. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 1, it is characterized in that: described magnetic core is toroidal core, described coaxial cable is BBC (broadband coaxial cable), and coaxial cable comprises heart yearn and screen; Described magnetic core is annular, and the diameter of magnetic core is less than 20mm, is highly less than 20mm, and the diameter of described coaxial cable is less than 4mm, and frequency band is greater than 100MHz.
5. one kind comprises the buffer circuit of the anti-high-frequency high-speed common mode disturbances of broadband common mode inductor, it is characterized in that: comprise insulating power supply, the input of buffer circuit, buffer circuit input reference point, the output of buffer circuit and buffer circuit output reference point, be connected with the second broadband common mode inductor at the output of buffer circuit, insulating power supply is connected with common mode inductance; First heart yearn external terminal of the second broadband common mode inductor is connected with the output of buffer circuit by impedance matching resistor, second broadband common mode inductor second heart yearn external terminal is connected with the difference mode signal output after isolation, first screen external terminal of the second broadband common mode inductor is connected with buffer circuit output reference point, and the second broadband common mode inductor secondary shielding layer external terminal is connected with buffer circuit difference mode signal and exports with reference to ground; Second broadband common mode inductor comprises magnetic core, and magnetic core is wound with coaxial cable.
6. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 5, it is characterized in that: be connected with the first broadband common mode inductor at the input of buffer circuit, first heart yearn external terminal of the first broadband common mode inductor is connected with difference mode signal input, second heart yearn external terminal of the first broadband common mode inductor is connected with the input of buffer circuit, first screen external terminal of the first broadband common mode inductor is connected with difference mode signal input with reference to ground, and the secondary shielding layer external terminal of the first broadband common mode inductor is connected with buffer circuit input reference point; At the input of buffer circuit and the indirect terminal resistance of buffer circuit input reference point, the first broadband common mode inductor comprises magnetic core, and magnetic core is wound with coaxial cable.
7. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 5, it is characterized in that: described magnetic core is toroidal core, described coaxial cable is BBC (broadband coaxial cable), and coaxial cable comprises heart yearn and screen; Described magnetic core is annular, and the diameter of magnetic core is less than 20mm, is highly less than 20mm, and the diameter of described coaxial cable is less than 4mm, and frequency band is greater than 100MHz.
8. one kind comprises the buffer circuit of the anti-high-frequency high-speed common mode disturbances of broadband common mode inductor, it is characterized in that: comprise multiple isolation branch circuit, the outlet side of multiple isolation branch circuit has identical buffer circuit output reference point, common-mode voltage is there is between the difference mode signal input of adjacent two isolation branch circuits, broadband common mode inductor is connected with at the input of each isolation branch circuit, first heart yearn external terminal of broadband common mode inductor is connected with the difference mode signal input in corresponding isolation branch circuit, second heart yearn external terminal of broadband common mode inductor is connected with the input in corresponding isolation branch circuit, first screen external terminal of broadband common mode inductor is connected with difference mode signal input with reference to ground, the secondary shielding layer external terminal of broadband common mode inductor is connected with the input reference point of corresponding isolation branch circuit, described broadband common mode inductor comprises magnetic core, and magnetic core is wound with coaxial cable.
9. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 8, is characterized in that: be respectively connected with a terminal resistance at the input of each buffer circuit and the indirect of buffer circuit input reference point.
10. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 8, it is characterized in that: described magnetic core is toroidal core, described coaxial cable is BBC (broadband coaxial cable), and coaxial cable comprises heart yearn and screen; Described magnetic core is annular, and the diameter of magnetic core is less than 20mm, is highly less than 20mm, and the diameter of described coaxial cable is less than 4mm, and frequency band is greater than 100MHz.
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| CN201210196729.1A CN103337336B (en) | 2012-06-15 | 2012-06-15 | A kind of broadband common mode inductor and comprise the buffer circuit of broadband common mode inductor |
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| CN1794514A (en) * | 2005-09-22 | 2006-06-28 | 中国舰船研究设计中心 | Ultra width band wave filter |
| CN1812558A (en) * | 2005-10-18 | 2006-08-02 | 青岛哈工大嵌入式系统研究院有限公司 | Video transmission anti-interference device |
| CN202816542U (en) * | 2012-06-15 | 2013-03-20 | 杭州祺来电子有限公司 | Broadband common mode inductor and isolating circuit using same |
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| Publication number | Publication date |
|---|---|
| CN103337336A (en) | 2013-10-02 |
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