CN103337336A - Broadband common mode inductor and isolating circuit comprising broadband common mode inductor - Google Patents
Broadband common mode inductor and isolating circuit comprising broadband common mode inductor Download PDFInfo
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- CN103337336A CN103337336A CN2012101967291A CN201210196729A CN103337336A CN 103337336 A CN103337336 A CN 103337336A CN 2012101967291 A CN2012101967291 A CN 2012101967291A CN 201210196729 A CN201210196729 A CN 201210196729A CN 103337336 A CN103337336 A CN 103337336A
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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
The present invention relates to a kind of electronic metering equipment, relate in particular to a kind of signal isolation circuit of anti-high-frequency high-speed common mode disturbances and the broadband common mode inductance device in the circuit thereof.
Background technology
Buffer circuit can arrive outlet side with the electrical signal transfer of input side, but isolates electric between input side and the outlet side, insulate in other words conj.or perhaps, only has a less electric capacity between input side and the outlet side.
Buffer circuit can improve the common-mode rejection ratio when measuring, and reduces and disturbs, and improves signal quality, also can completely cut off dangerous voltage, protection equipment and personal safety.When multichannel was measured simultaneously, buffer circuit can also prevent the short circuit accident that causes altogether because of interchannel.
Along with the more and more attention of society to energy-conserving and environment-protective, can efficiently handle electric energy power electronic equipment use more and more widely.One of characteristics of power electronic equipment are often to contain the HF switch pulse.When these equipment are controlled, tested and debug, often need to use buffer circuit.Though buffer circuit itself can improve the common-mode rejection ratio when measuring to a certain extent, reduce and disturb, but owing to have one electric capacity all the time between buffer circuit input side and the outlet side, though numeric ratio is less, but pulse still presents Low ESR to the high speed common mode, common mode disturbances can be coupled in the differential mode output signal, makes the output signal distortion, obtain wrong measurement result, perhaps make the subsequent conditioning circuit misoperation.
Shown in Fig. 1, input difference mode signal Vd is connected between the input side reference point 3 of the input 2 of buffer circuit 1 and buffer circuit 1, the differential mode output signal after obtaining isolating between the output 4 of buffer circuit 1 and the outlet side reference point 5.Separator 6 both sides of buffer circuit 1 constitute an electric capacity 7.Usually input signal has potential difference with reference to ground 8 and outlet side with reference to 9 on ground, i.e. common-mode voltage Vc.This common-mode voltage Vc directly is added in and isolates on the barrier 6, also is that Vc directly is added on the electric capacity 7, sees equivalent electric circuit Fig. 2.Though electric capacity 7 is less usually, generally at number pF to tens of pF, the common-mode signal of high dV/dt is Low ESR, make the high speed common-mode signal can be coupled to the outlet side of buffer circuit, disturbed the output difference mode signal.
For the low bandwidth buffer circuit, the difference mode signal frequency is lower, can be at output side joint low pass filter, and filtering or weaken the high-frequency high-speed common mode disturbances.For the high-speed isolated circuit, comprise digital buffer circuit and broadband simulation buffer circuit, need to handle the difference mode signal in high speed, broadband, just can not add low-pass filtering at outlet side, so be difficult to remove the high-frequency high-speed common mode disturbances.
Summary of the invention
It is little to the invention provides a kind of differential mode leakage reactance, difference mode signal is had the broadband common mode inductance of good high frequency characteristics; Solve the undesirable technical problem of the high frequency characteristics for difference mode signal that common mode inductance exists in the prior art.
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, make when buffer circuit is worked under high-frequency high-speed common mode disturbances environment, can obtain totally, broadband differential mode output signal accurately, the buffer circuit of the applicable broadband common mode inductance that can use in many occasions; When having solved the high-frequency high-speed environment use that exists in the prior art, be difficult to remove interference, the technical problem that output effect is undesirable.
Above-mentioned technical problem of the present invention solves by following technical proposals: a kind of broadband common mode inductance, comprise magnetic core, and be wound with coaxial cable at magnetic core.Numeral buffer circuit or broadband simulation buffer circuit, the difference mode signal bandwidth to more than hundreds of MHz, is especially simulated buffer circuit from direct current, input signal amplitude may be fainter, and strong common mode disturbances influence is arranged again, needs a kind of high bandwidth, full-shield, the broadband common mode inductance of impedance matching.For this reason, select for use coaxial cable as lead, itself has high bandwidth coaxial cable, full-shield, and the characteristic of impedance matching is added the close-coupled of heart yearn and screen, makes that the differential mode leakage reactance of common mode inductance is very little, and difference mode signal is had good high frequency characteristics.Coaxial cable on magnetic core, is normally used magnet ring, can obtain the common mode inductance value of littler volume and Geng Gao.
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, 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, and height is less than 20mm, and the diameter of described coaxial cable is less than 4mm, and frequency band is greater than 100MHz.Select the miniature magnet ring of high magnetic permeability and the little coaxial cable of external diameter, available relatively shorter cable obtains enough common mode inductance amounts.
Wherein a kind of buffer circuit of the anti-high-frequency high-speed common mode disturbances that forms according to above-mentioned broadband common mode inductance, comprise input, the buffer circuit input reference point of insulating power supply, buffer circuit, output and the buffer circuit output reference point of buffer circuit, be connected with the first broadband common mode inductance at the input of buffer circuit; The first heart yearn external terminal of the first broadband common mode inductance is connected with the difference mode signal input, the second heart yearn external terminal of the first broadband common mode inductance is connected with the input of buffer circuit, the first screen external terminal of the first broadband common mode inductance is connected with the difference mode signal input with reference to ground, and the secondary shielding layer external terminal of the first broadband common mode inductance is connected with buffer circuit input reference point.After input adds the broadband common mode inductance, between the input reference point that common-mode voltage no longer directly is added on buffer circuit and the output reference point, but apply via the broadband common mode inductance of connecting.Common mode inductance allows direct current to the above broadband difference mode signal of hundreds of MHz to pass through, but the high-frequency high-speed common-mode signal is high impedance.The electric capacity that the two ends of buffer circuit form is connected with the broadband common mode inductance and is caused series resonance, usually the series resonance frequency design is in lower frequency, and buffer circuit has high inhibition ability to the low frequency common mode disturbances usually, even common mode inductance and electric capacity produce resonance the common-mode voltage on the electric capacity is amplified, also can not produce significantly the output difference mode signal and disturb.
As preferably, between the input of buffer circuit and buffer circuit input reference point, connect terminal resistance.Can with the coaxial cable impedance matching, improve the stability of circuit.
In some applications, the buffer circuit outlet side is earth-free, for example battery powered hand-held oscillography table.Outlet side circuit this moment 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.The stray capacitance numeric ratio is less over the ground for output, compares with buffer circuit output head grounding situation, can reduce the voltage on the electric capacity that is applied to buffer circuit formation, has reduced common mode disturbances, behind the access band common mode inductance, then can further suppress high frequency common mode and disturb.
Enough suppress common mode disturbances if add the output common mode inductance, then can save the broadband common mode inductance of input.Buffer circuit described as follows: comprise input, the buffer circuit input reference point of insulating power supply, buffer circuit, output and the buffer circuit output reference point of buffer circuit, output at buffer circuit is connected with the second broadband common mode inductance, is connected with common mode inductance on the insulating power supply; The first heart yearn external terminal of the second broadband common mode inductance is connected with the output of buffer circuit by impedance matching resistance, the second broadband common mode inductance, the second heart yearn external terminal is connected with the difference mode signal output after the isolation, the first screen external terminal of the second broadband common mode inductance is connected with buffer circuit output reference point, and the second broadband common mode inductance secondary shielding layer external terminal is connected with the output of buffer circuit difference mode signal with reference to ground.Application for aspects such as oscilloscope channel isolation and oscilloscope isolation probes requires input impedance high especially, and input capacitance is low especially.The common mode inductance that the common mode inductance that connects on the DC power supply can be used with the common power loop, but need bigger common mode inductance amount, to obtain good effect, insulating power supply can certainly be adopted independently powered battery, can save common mode inductance.
Application for aspects such as oscilloscope channel isolation and oscilloscope isolation probes requires input impedance high especially, and input capacitance is low especially.Then usually the coaxial cable of coiling broadband common mode inductance can only be controlled length at several centimetres.Then can further at isolated amplifier input and output all connect a broadband common mode inductance if the common mode inductance amount still is not enough to the high-frequency high-speed common mode inhibition capacity that provides enough this moment.As preferably, input at buffer circuit is connected with the first broadband common mode inductance, the first heart yearn external terminal of the first broadband common mode inductance is connected with the difference mode signal input, the second heart yearn external terminal of the first broadband common mode inductance is connected with the input of buffer circuit, the first screen external terminal of the first broadband common mode inductance is connected with the difference mode signal input with reference to ground, and the secondary shielding layer external terminal of the first broadband common mode inductance is connected with buffer circuit input reference point; Between the input of buffer circuit and buffer circuit input reference point, connect terminal resistance.Because buffer circuit output impedance is lower, generally be 50 ohm, be connected to after terminal resistance 22 prevents reflection, to output cable length without limits, and in volume and time-delay allowed band, can be long.So just can obtain the bigger broadband common mode inductance 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 inductance amount just can design smallerly, and cable length can be shorter.
Another buffer circuit arranged side by side with such scheme, be applied to binary channels or multichannel, comprise a plurality of isolation branch circuits, the outlet side of a plurality of isolation branch circuits has identical buffer circuit output reference point, there is common-mode voltage between the difference mode signal input of adjacent two isolation branch circuits, be connected with the broadband common mode inductance at each input of isolating branch circuit, the first heart yearn external terminal of broadband common mode inductance is connected with the difference mode signal input in the corresponding isolation branch circuit, the second heart yearn external terminal of broadband common mode inductance is connected with the input in the corresponding isolation branch circuit, the first screen external terminal of broadband common mode inductance is connected with the difference mode signal input with reference to ground, and the secondary shielding layer external terminal of broadband common mode inductance is connected with the input reference point of corresponding isolation branch circuit; Between the input of each buffer circuit and buffer circuit input reference point, connect and respectively be connected with a terminal resistance.
Broadband of the present invention common mode inductance and the buffer circuit of using this inductance possess following advantage: the broadband common mode inductance 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 that the differential mode leakage reactance of broadband common mode inductance is little, difference mode signal is had good high frequency characteristics.The broadband common mode inductance is applied in the buffer circuit, makes under the fainter situation of input signal, still can obtain signal output clearly, anti-high-frequency high-speed common mode disturbances ability is good.
Description of drawings
The existing buffer circuit schematic diagram of Fig. 1.
The existing buffer circuit common mode interference signal of Fig. 2 loop equivalent electric circuit.
Fig. 3 broadband of the present invention common mode inductance coiling schematic diagram.
Fig. 4 is the interior enlarged diagram of the square frame of Fig. 3.
Fig. 5 input side of the present invention is connected to the buffer circuit of broadband common mode inductance.
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 the broadband common mode inductance.
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 inductance.
The earth-free situation of Figure 10 buffer circuit outlet side of the present invention.
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 inventing is described in further detail.
Embodiment 1:
Shown in Fig. 3 and 4, a kind of broadband common mode inductance comprises the magnet ring 11 of annular, and solderless wrapped connection has a coaxial cable 10 outside the 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 the heart yearn external terminal is positioned at the screen external terminal.The second heart yearn external terminal 14 of the first heart yearn external terminal 12 of coaxial cable 10 1 ends and the other end of coaxial circuit constitutes first winding, the first screen external terminal 13 of coaxial cable 10 1 ends constitutes 15, two windings of second winding with the secondary shielding layer external terminal of the other end and forms the broadband common mode inductance.
Embodiment 2:
As shown in Figure 5, a kind of buffer circuit of anti-high-frequency high-speed common mode disturbances, comprise input 2, the buffer circuit input reference point 3 of insulating power supply 31, buffer circuit, output 4 and the buffer circuit output reference point 5 of buffer circuit, output reference point 5 connects with reference to ground 9.Insulating power supply 31 is connected on the buffer circuit 1, the both sides of the separator 6 of buffer circuit 1 constitute an electric capacity 7, input at buffer circuit is connected with the first broadband common mode inductance 16, connects terminal resistance 20 between the input 2 of buffer circuit and buffer circuit input reference point 3.The structure of the first broadband common mode inductance 16 as described in Example 1, the coaxial cable solderless wrapped connection forms first winding 17 and second winding 18 on magnetic core.The first heart yearn external terminal 12 that constitutes first winding 17 is connected with the input of difference mode signal Vd, the second heart yearn external terminal 14 that constitutes first winding 17 is connected with the input 2 of buffer circuit, constitute input that first screen, 13 external terminal of second winding 18 are connected with difference mode signal Vd with reference to ground 8, the secondary shielding layer external terminal 15 that constitutes second winding 18 is connected with buffer circuit input reference point 3.After adding the broadband common mode inductance, between the input reference point 3 that common-mode voltage Vc no longer directly is added on buffer circuit 1 and the output reference point 5, but apply via the broadband common mode inductance of connecting.As shown in Figure 6, inductance 19 is common mode inductance amounts of broadband common mode inductance 16 among Fig. 5.Electric capacity 7 is the equivalent capacity that buffer circuit 1 is isolated between the barrier both sides among Fig. 5.Among Fig. 6, voltage is the second-order low-pass filter output valve of Vc on the electric capacity 7.For the outer frequency of this second-order low-pass filter passband, common-mode signal Vd frequency is more high, or dV/dt is more big, and the voltage magnitude on the electric capacity 7 is more little.The inductance capacitance series circuit may cause series resonance.Choose reasonable common mode inductance amount 19 is considered the loss of common mode inductance itself again, and big inductance value and little capacitance often in the reality, can avoid inductance 19 and electric capacity 7 to produce excessive series resonance.Usually series resonance frequency designs at lower frequency, and buffer circuit has high inhibition ability to the low frequency common mode disturbances usually.Even inductance 19 produces resonance with electric capacity 7 common-mode voltage on the electric capacity 7 is amplified, also can not produce obviously the output difference mode signal and disturb.
Embodiment 3:
As shown in Figure 7, the application for aspects such as oscilloscope channel isolation and oscilloscope isolation probes requires input impedance high especially, and input capacitance is low especially.Then usually the coaxial cable of coiling broadband common mode inductance can only be controlled length at several centimetres.This moment then can be further at another broadband common mode inductance of isolated amplifier output termination if the common mode inductance amount still is not enough to the high-frequency high-speed common mode inhibition capacity that provides enough.
It comprises input 2, the buffer circuit input reference point 3 of insulating power supply 31, buffer circuit, output 4 and the buffer circuit output reference point 5 of buffer circuit.Insulating power supply 31 is connected on the buffer circuit 1, and the both sides of the separator 6 of buffer circuit 1 constitute an electric capacity 7, is connected with the first broadband common mode inductance 16 at the input of buffer circuit, connects the second broadband common mode inductance 21 at output.The first broadband common mode inductance 16 is identical with the structure of the second broadband common mode inductance 21, all as describing in the embodiment 1.Being connected as described in the embodiment 2 of the first broadband common mode inductance 16 of input and buffer circuit, do not repeat them here.The first heart yearn end 12 in first winding 17 that the coaxial cable core wire of the second broadband common mode inductance of output forms is connected with buffer circuit input 4 through impedance matching resistance 22, and the second heart yearn end 14 of first winding 17 of the second broadband common mode inductance of output is as the difference mode signal output after isolating.The first screen external terminal 13 of second winding 18 that the coaxial cable core wire of the second broadband common mode inductance of output forms links to each other with buffer circuit output reference point 5, and the secondary shielding layer external terminal 15 of 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.The common mode inductance that common mode inductance 23 can be used with the common power loop, but need bigger common mode inductance amount, with the effect that obtains.Also independently powered battery can be used, common mode inductance 23 can be saved.
The common-mode signal loop equivalent electric circuit of this moment as shown in Figure 8.Inductance 19 is common mode inductance amounts of broadband common mode inductance 16 among Fig. 7.Inductance 24 is common mode inductance amounts of the broadband common mode inductance 21 among Fig. 7, and inductance 25 is insulating power supply common mode inductance amounts among Fig. 7.Electric capacity 7 is the equivalent capacity that buffer circuit 1 is isolated between the barrier both sides among Fig. 7.The loop except have input side broadband common mode inductance 19, the inductance that the common mode inductance amount 25 by the common mode inductance amount 24 of the broadband common mode inductance 21 of outlet side and DC power supply common mode inductance 23 of having connected again is formed in parallel.If use powered battery, can there be power supply common mode inductance 25.
Because buffer circuit output impedance is lower, generally be 50 ohm, be connected to after terminal resistance 22 prevents reflection, to output cable length without limits, and in volume and time-delay allowed band, can be long.So just can obtain the bigger broadband common mode inductance 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 inductance amount just can design smallerly, and cable length can be shorter.
Embodiment 4:
As shown in Figure 9, enough suppress common mode disturbances if add the output common mode inductance, then can save the broadband common mode inductance 16 of input.The input impedance of buffer circuit is just unaffected fully like this.This buffer circuit, comprise an insulating power supply, be connected with a common mode inductance 23 at insulating power supply 31, between the input 2 of buffer circuit and buffer circuit input reference point 3, connect terminal resistance 20, the input 2 of the 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.Output at buffer circuit 1 is connected with second common mode inductance 21.The first heart yearn end 12 in first winding 17 that the coaxial cable core wire of the second broadband common mode inductance of output forms is connected with buffer circuit input 4 through impedance matching resistance 22, and the second heart yearn end 14 of first winding 17 of the second broadband common mode inductance of output is as the difference mode signal output after isolating.The first screen external terminal 13 of second winding 18 that the coaxial cable core wire of the second broadband common mode inductance of output forms links to each other with buffer circuit output reference point 5, and the secondary shielding layer external terminal 15 of second winding 18 is connected with reference to ground 9 with output.
Embodiment 5:
As shown in figure 10, in some applications, the buffer circuit outlet side is earth-free, for example battery powered hand-held oscillography table.Outlet side circuit this moment stray capacitance over the ground still can make high frequency common mode disturb circulation.Buffer circuit is connected with the first broadband common mode inductance at input, the first heart yearn external terminal 12 of first winding 17 of the first broadband common mode inductance is connected with the input of difference mode signal Vd, the second heart yearn external terminal 14 that constitutes first winding 17 is connected with the input 2 of buffer circuit, first screen, 13 external terminal of second winding 18 of the first broadband common mode inductance are connected with the reference ground of difference mode signal Vd, and the secondary shielding layer external terminal 15 that constitutes 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 that forms with separator 6 both sides of buffer circuit 1,16 series connection of input side broadband common mode inductance, stray capacitance 26 numeric ratios are less over the ground for its equivalent circuit Figure 11, outlet side, compare with buffer circuit outlet side ground connection situation, can reduce the voltage that is applied on the electric capacity 7, reduced common mode disturbances, behind the access band common mode inductance 16, then can further suppress high frequency common mode and disturb.The broadband common mode inductance is still effective in this application.
Embodiment 6:
As shown in figure 12, use for binary channels or multichannel, several buffer circuits have same reference points at outlet side, and first buffer circuit, 1 output reference point 5 and second buffer circuit, 27 output reference points 28 link together.Second isolation capacitance 29 that second buffer circuit 27 forms, and be connected to broadband the 3rd broadband common mode inductance 30 at input.First buffer circuit, 1 difference-mode input signal is Vd1, and second buffer circuit, 27 difference-mode input signals are Vd2, and Vd1 and Vd2 may not have same reference point, then have common-mode voltage Vc between Vd1 and the 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 inductance 30.Voltage sum on electric capacity 7 and the electric capacity 29 still is the value of Vc behind second-order low-pass filter, decay fast outside the low-pass filtering passband.So the access band common mode inductance is still effective to the inhibition that high frequency common mode is disturbed.
Claims (10)
1. a broadband common mode inductance is characterized in that: comprise magnetic core, be wound with coaxial cable at magnetic core.
2. a kind of broadband according to claim 1 common mode inductance, it is characterized in that: described magnetic core is toroidal core, and described coaxial cable is BBC (broadband coaxial cable), and coaxial cable comprises heart yearn and screen.
3. a kind of broadband according to claim 1 and 2 common mode inductance, it is characterized in that: described magnetic core is annular, and the diameter of magnetic core is less than 20mm, and height is less than 20mm, and the diameter of described coaxial cable is less than 4mm, and frequency band is greater than 100MHz.
4. the buffer circuit of the anti-high-frequency high-speed common mode disturbances that forms of broadband according to claim 1 common mode inductance, it is characterized in that: comprise input, the buffer circuit input reference point of insulating power supply, buffer circuit, output and the buffer circuit output reference point of buffer circuit, be connected with the first broadband common mode inductance at the input of buffer circuit; The first heart yearn external terminal of the first broadband common mode inductance is connected with the difference mode signal input, the second heart yearn external terminal of the first broadband common mode inductance is connected with the input of buffer circuit, the first screen external terminal of the first broadband common mode inductance is connected with the difference mode signal input with reference to ground, and the secondary shielding layer external terminal of the first broadband common mode inductance is connected with buffer circuit input reference point.
5. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 4 is characterized in that: connect terminal resistance between the input of buffer circuit and buffer circuit input reference point.
6. according to the buffer circuit of claim 4 or 5 described anti-high-frequency high-speed common mode disturbances, it is characterized in that: 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.
7. the buffer circuit of the anti-high-frequency high-speed common mode disturbances that forms of broadband according to claim 1 common mode inductance, it is characterized in that: comprise input, the buffer circuit input reference point of insulating power supply, buffer circuit, output and the buffer circuit output reference point of buffer circuit, output at buffer circuit is connected with the second broadband common mode inductance, is connected with common mode inductance on the insulating power supply; The first heart yearn external terminal of the second broadband common mode inductance is connected with the output of buffer circuit by impedance matching resistance, the second broadband common mode inductance, the second heart yearn external terminal is connected with the difference mode signal output after the isolation, the first screen external terminal of the second broadband common mode inductance is connected with buffer circuit output reference point, and the second broadband common mode inductance secondary shielding layer external terminal is connected with the output of buffer circuit difference mode signal with reference to ground.
8. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 7, it is characterized in that: the input at buffer circuit is connected with the first broadband common mode inductance, the first heart yearn external terminal of the first broadband common mode inductance is connected with the difference mode signal input, the second heart yearn external terminal of the first broadband common mode inductance is connected with the input of buffer circuit, the first screen external terminal of the first broadband common mode inductance is connected with the difference mode signal input with reference to ground, and the secondary shielding layer external terminal of the first broadband common mode inductance is connected with buffer circuit input reference point; Between the input of buffer circuit and buffer circuit input reference point, connect terminal resistance.
9. the buffer circuit of the anti-high-frequency high-speed common mode disturbances that forms of broadband according to claim 1 common mode inductance, it is characterized in that: comprise a plurality of isolation branch circuits, the outlet side of a plurality of isolation branch circuits has identical buffer circuit output reference point, there is common-mode voltage between the difference mode signal input of adjacent two isolation branch circuits, be connected with the broadband common mode inductance at each input of isolating branch circuit, the first heart yearn external terminal of broadband common mode inductance is connected with the difference mode signal input in the corresponding isolation branch circuit, the second heart yearn external terminal of broadband common mode inductance is connected with the input in the corresponding isolation branch circuit, the first screen external terminal of broadband common mode inductance is connected with the difference mode signal input with reference to ground, and the secondary shielding layer external terminal of broadband common mode inductance is connected with the input reference point of corresponding isolation branch circuit.
10. the buffer circuit of anti-high-frequency high-speed common mode disturbances according to claim 9 is characterized in that: connect between the input of each buffer circuit and buffer circuit input reference point and respectively be connected with a terminal resistance.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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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| CN103337336B CN103337336B (en) | 2016-04-27 |
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Cited By (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114640402A (en) * | 2022-03-11 | 2022-06-17 | 云南安爆数码电子科技有限公司 | Method and circuit for receiving communication pulse current signal by double common mode inductors |
| CN114640402B (en) * | 2022-03-11 | 2024-03-15 | 云南创芯微电子科技有限公司 | Method and circuit for receiving communication pulse current signal by double common mode inductors |
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