CN211266764U - Self-adaptive electromagnetic interference filter - Google Patents
Self-adaptive electromagnetic interference filter Download PDFInfo
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- CN211266764U CN211266764U CN202020001283.2U CN202020001283U CN211266764U CN 211266764 U CN211266764 U CN 211266764U CN 202020001283 U CN202020001283 U CN 202020001283U CN 211266764 U CN211266764 U CN 211266764U
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- interference filter
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Abstract
The utility model discloses a self-adaptation electromagnetic interference filter. The adaptive electromagnetic interference filter includes: detecting calipers, injecting calipers and a signal reversing circuit; the signal reversing circuit is respectively connected with the detection calipers and the injection calipers; the detection calipers and the injection calipers are sleeved on the measured line. The utility model discloses a set up and detect calliper, pour into calliper and signal reversal circuit and can eliminate electromagnetic interference, compare in the electromagnetic interference wave filter that current comprises electric capacity and inductance, small, light in weight are convenient for use in equipment of heavy current, high voltage.
Description
Technical Field
The utility model relates to an anti-electromagnetic interference field especially relates to a self-adaptation electromagnetic interference filter.
Background
All electronic devices are plagued by electromagnetic interference generated by the inverter power supply. An electromagnetic-Interference (EMI) filter is typically provided at the power input of the device to remove Interference.
The traditional EMI filter consists of a capacitor and an inductor, and has the problems of large volume and heavy weight which cannot be overcome when being applied to large current and high voltage. For example, a complete set of EMI filters of EV (electric drive) system developed by national vehicle laboratories of the university of beijing rationality cannot be applied to household electric vehicles due to the disadvantages of large size and heavy weight. Therefore, there is a strong need in the market for a small, lightweight electromagnetic interference filter that can be used in high current, high voltage applications.
Disclosure of Invention
The utility model aims at providing a small, light in weight's self-adaptation electromagnetic interference filter to use in equipment of heavy current, high voltage.
In order to achieve the above object, the utility model provides a following scheme:
an adaptive electromagnetic interference filter comprising: detecting calipers, injecting calipers and a signal reversing circuit; the signal reversing circuit is respectively connected with the detection caliper and the injection caliper; the detection calipers and the injection calipers are all sleeved on a measured line, and the detection calipers and the injection calipers are not in contact with the measured line.
Optionally, the detection caliper and the injection caliper are arranged in side-by-side contact.
Optionally, the detection caliper and the injection caliper are both magnetic rings wound with coils.
Optionally, an annular shielding shell is arranged outside the magnetic ring; the annular shielding shell is provided with a high-frequency connector; one end of the coil is connected with the high-frequency connector.
Optionally, the adaptive electromagnetic interference filter further includes: the power driving circuit is respectively connected with the signal reversing circuit and the injection caliper; and the electromagnetic interference current on the measured line flows from one end corresponding to the detection caliper to one end corresponding to the injection caliper.
Optionally, the adaptive electromagnetic interference filter further includes: the mutual inductor, the mutual inductor respectively with signal inverter circuit with the power drive circuit is connected, the mutual inductor cover is established on being surveyed the line, and with being surveyed the line contactless.
Optionally, the adaptive electromagnetic interference filter further includes: and the rectifier bridge voltage stabilizer is respectively connected with the mutual inductor, the power driving circuit and the signal reversing circuit.
Optionally, the signal inverting circuit is an ultra-high speed operational amplifier.
Optionally, the power driving circuit is composed of two stages of operational amplifiers with a maximum bandwidth of 400 MHz.
Optionally, the magnetic ring wound with the coil is composed of an ultracrystalline magnetic core and a low-permeability magnetic core, the ultracrystalline magnetic core and the low-permeability magnetic core are both annular, and the ultracrystalline magnetic core is sleeved on an outer ring of the low-permeability magnetic core.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect: the method comprises the steps of setting a detection caliper to obtain an electromagnetic interference signal on a measured line, processing the obtained electromagnetic interference signal through a signal reversing circuit, obtaining a reverse electromagnetic interference signal which is equal to the original electromagnetic interference signal on the measured line in amplitude and opposite in phase on the measured line, and transmitting the reverse electromagnetic interference signal to an injection caliper to achieve cancellation with the original electromagnetic interference signal. The utility model discloses a set up and detect calliper, pour into calliper and signal reversal circuit and can eliminate electromagnetic interference, compare in the electromagnetic interference wave filter that current comprises electric capacity and inductance, small, light in weight are convenient for use in equipment of heavy current, high voltage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an adaptive electromagnetic interference filter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a detection caliper in an adaptive electromagnetic interference filter according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an ultra-high speed operational amplifier in an adaptive electromagnetic interference filter according to an embodiment of the present invention;
FIG. 4 shows the gain and R of the ultra-high speed operational amplifier in the adaptive electromagnetic interference filter according to an embodiment of the present inventionfA line graph of (a);
fig. 5 is a schematic structural diagram of a power driving circuit in an adaptive electromagnetic interference filter according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the working principle of the detection caliper in the adaptive electromagnetic interference filter of the embodiment of the present invention.
Description of the symbols: 1-detection caliper, 2-injection caliper, 3-signal reverse circuit, 4-power drive circuit, 5-mutual inductor, 6-rectifier bridge voltage stabilizer, 7-coil, 8-magnetic ring, 9-annular shielding shell, 10-filler and 11-high frequency connector.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing an adaptive electromagnetic interference filter, because adaptive interference filter's small, light in weight so can use in equipment of heavy current, high voltage
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the adaptive electromagnetic interference filter in the present embodiment includes: detecting calipers 1, injecting calipers 2 and a signal reversing circuit 3; the signal reversing circuit 3 is respectively connected with the detection caliper 1 and the injection caliper 2; the detection calipers 1 and the injection calipers 2 are sleeved on a measured line and are not in contact with the measured line.
The signal reversing circuit 3 can process the obtained electromagnetic interference signal to obtain a reverse electromagnetic signal with the same amplitude and opposite phase with the original electromagnetic interference signal on the measured line. This drawback of the electromagnetic signal conversion capability of the detection caliper 1 and of the injection caliper 2 at different frequencies not only being attenuated but also unbalanced can be compensated by the gain of the signal inversion circuit 3.
As an alternative embodiment, the detection caliper 1 and the injection caliper 2 are arranged in contact side by side.
As an alternative embodiment, the detection caliper 1 and the injection caliper 2 are both magnetic rings 8 wound with coils 7. As shown in fig. 2, an annular shielding shell 9 is arranged outside the magnetic ring 8; one end of the coil 7 extends to the outside of the annular shielding shell 9; the annular shielding shell 9 and the magnetic ring 8 are filled with filler 10; the filler 10 is an insulating material; the filler 10 is used for fixing the position of the magnetic ring 8 and preventing the magnetic ring 8 from shaking; the annular shielding shell 9 is provided with a high-frequency connector 11, and the coil 7 is connected with the signal reversing circuit 3 through the high-frequency connector 11.
As an optional implementation, the adaptive electromagnetic interference filter further comprises a power driving circuit 4; the power driving circuit 4 is respectively connected with the signal reversing circuit 3 and the injection caliper 2; the current on the tested line flows from one end corresponding to the detection caliper 1 to one end corresponding to the injection caliper 2, and the power driving circuit 4 drives the injection caliper 2 to execute a cancellation function.
As an optional implementation, the adaptive electromagnetic interference filter further includes: the mutual inductor 5 is respectively connected with the signal reversing circuit 3 and the power driving circuit 4, and the mutual inductor 5 is sleeved on the measured line and is not in contact with the measured line; the mutual inductor 5 extracts coupling current from a tested line to provide power for the signal reverse amplification circuit and the power driving circuit 4.
As an alternative embodiment, the transformer 5 is the contactless transformer.
As an optional implementation, the adaptive electromagnetic interference filter further includes: and the rectifier bridge voltage stabilizer 6 is connected with the mutual inductor 5, the power driving circuit 4 and the signal reversing circuit 3 respectively, and the rectifier bridge voltage stabilizer processes the coupling current to obtain direct current voltage so as to provide a proper power supply for the signal reversing amplifying circuit and the power driving circuit 4.
As an alternative embodiment, as shown in fig. 3, the signal inverting circuit 3 is an ultra-high speed operational amplifier. By setting a feedback resistor RfIs adjusted, the input impedance Rin of the ultra-high speed operational amplifier is matched with the output impedance 50 Ω of the detection caliper 1, and Rin is present as Rin-RT-Rg, so that after Rg is determined, the gain and frequency response of the ultra-high speed operational amplifier are mainly determined by RfAnd (6) determining. As shown in FIG. 4, the abscissa is the gain of the ultra-high speed operational amplifier and the ordinate is RfMagnitude of resistance, RfWhen adjusted from 200 omega to 500 omega, the gain response is 4 to 10 times. According to this, an ideal compromise or average value can be determined as the fixed compensated R, based on the insertion loss characteristics of the test caliper 1 and the injection caliper 2fAnd (4) value, and realizing the function of fixed compensation.
Since the interference signal is random, and it is difficult to achieve a good effect only by adjusting the gain of a certain frequency, the method for implementing fixed compensation specifically includes: inputting an automatic scanning signal with the frequency range of 10 kHz-100 MHz at the input end of the transmission wire, and monitoring the residual signal at the output end of the transmission wire after being offset by the injection caliper 2; by adjusting RfA different value, andwhile observing the residual signal, when the residual signal is minimum, R isfR is preferablyfThe value is obtained.
As an alternative embodiment, as shown in fig. 5, the power driving circuit 4 is composed of two stages of OPA8461DBVT operational amplifiers with a maximum bandwidth of 400 MHz.
As an alternative embodiment, the magnetic ring 8 wound with the coil 7 is composed of an ultra-crystalline magnetic core with good low-frequency characteristics and a low-permeability magnetic core with high-frequency characteristics, the ultra-crystalline magnetic core and the low-permeability magnetic core are both annular in shape, and the ultra-crystalline magnetic core is sleeved on the outer ring of the low-permeability magnetic core. The low-permeability magnetic core is a manganese-zinc magnetic core or a nickel-zinc magnetic core. The detection caliper 1 and the injection caliper 2 are current probes with low frequency and high frequency, and are suitable for the adaptive filter of a frequency domain of 10 kHz-100 MHHz.
As an optional implementation manner, the adaptive electromagnetic interference filter further includes a PCB board, and the power driving circuit 4, the signal inverting module, and the rectifier bridge voltage regulator 6 are all disposed on the PCB board; the PCB is provided with two high-frequency connectors, and the high-frequency connectors arranged on the PCB are connected with the high-frequency connectors 11 arranged on the annular shielding shell 9 through cables.
The high-frequency connector in this embodiment may be a BNC socket or an SMA socket.
The detection calipers are distinguished from a frequency domain through electromagnetic coupling in the calipers, electromagnetic interference higher than power transmission frequency is extracted, then the extracted electromagnetic interference signals are processed through the signal reversing circuit, a reverse cancellation signal which is equal to the amplitude and opposite in phase of original electromagnetic interference signals on a measured line is obtained on the measured line, and the cancellation signal and the electromagnetic interference signals carried on the power transmission line are cancelled through electromagnetic coupling by injecting the calipers.
The utility model discloses a set up and detect calliper, pour into calliper and signal reversal circuit and can eliminate electromagnetic interference, compare in the electromagnetic interference wave filter that current comprises electric capacity and inductance, small, light in weight are convenient for use in equipment of heavy current, high voltage.
Fig. 6 shows the working principle of detecting the caliper: in order to improve the cancellation effect, the maximum interference voltage EN is required to be obtained as much as possible, and the voltage E of the input resistor of the receiver is requiredSAs close as possible to ENApparently IPThe larger the effect, the better; e when different input frequencies are simultaneously requiredSThe response curve is as flat as possible, the operation principle of the injection caliper is similar to that of the detection caliper, but the secondary coil is the primary coil, the transmission line is the secondary coil, and the cancellation voltage coupled to the transmission line is required to be equal to or close to NiThus achieving the aim of cancellation.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. An adaptive electromagnetic interference filter, comprising: detecting calipers, injecting calipers and a signal reversing circuit; the signal reversing circuit is respectively connected with the detection caliper and the injection caliper; the detection calipers and the injection calipers are all sleeved on a measured line, and the detection calipers and the injection calipers are not in contact with the measured line.
2. The adaptive electromagnetic interference filter of claim 1, wherein the detection caliper and the injection caliper are in side-by-side contact.
3. The adaptive electromagnetic interference filter of claim 1 wherein the detection caliper and the injection caliper are magnetic loops wound with coils.
4. An adaptive electromagnetic interference filter according to claim 3, wherein an annular shield case is provided outside the magnetic ring; the annular shielding shell is provided with a high-frequency connector; one end of the coil is connected with the high-frequency connector.
5. The adaptive electromagnetic interference filter of claim 1, further comprising: the power driving circuit is respectively connected with the signal reversing circuit and the injection caliper; and the electromagnetic interference current on the measured line flows from one end corresponding to the detection caliper to one end corresponding to the injection caliper.
6. The adaptive electromagnetic interference filter of claim 5, further comprising: the mutual inductor, the mutual inductor respectively with signal inverter circuit with the power drive circuit is connected, the mutual inductor cover is established on being surveyed the line, and with being surveyed the line contactless.
7. The adaptive electromagnetic interference filter of claim 6, further comprising: and the rectifier bridge voltage stabilizer is respectively connected with the mutual inductor, the power driving circuit and the signal reversing circuit.
8. The adaptive electromagnetic interference filter of claim 1, wherein the signal inversion circuit is an ultra-high speed operational amplifier.
9. The adaptive electromagnetic interference filter of claim 5, wherein the power driver circuit is comprised of two stages of operational amplifiers having a maximum bandwidth of 400 MHz.
10. An adaptive electromagnetic interference filter according to claim 3, wherein the magnetic loop wound with the coil is composed of an ultra-microcrystalline magnetic core and a low permeability magnetic core, the ultra-microcrystalline magnetic core and the low permeability magnetic core are both annular in shape, and the ultra-microcrystalline magnetic core is sleeved on an outer ring of the low permeability magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020001283.2U CN211266764U (en) | 2020-01-02 | 2020-01-02 | Self-adaptive electromagnetic interference filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020001283.2U CN211266764U (en) | 2020-01-02 | 2020-01-02 | Self-adaptive electromagnetic interference filter |
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| Publication Number | Publication Date |
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| CN211266764U true CN211266764U (en) | 2020-08-14 |
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| CN202020001283.2U Active CN211266764U (en) | 2020-01-02 | 2020-01-02 | Self-adaptive electromagnetic interference filter |
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| CN (1) | CN211266764U (en) |
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2020
- 2020-01-02 CN CN202020001283.2U patent/CN211266764U/en active Active
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