CN213152067U - Coupling/decoupling network and anti-interference test system - Google Patents
Coupling/decoupling network and anti-interference test system Download PDFInfo
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- CN213152067U CN213152067U CN202022408775.6U CN202022408775U CN213152067U CN 213152067 U CN213152067 U CN 213152067U CN 202022408775 U CN202022408775 U CN 202022408775U CN 213152067 U CN213152067 U CN 213152067U
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- 238000010168 coupling process Methods 0.000 title claims abstract description 133
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 133
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- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 238000002955 isolation Methods 0.000 claims abstract description 75
- 239000003990 capacitor Substances 0.000 claims abstract description 68
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Abstract
The utility model relates to a coupling/decoupling network and anti-interference test system, including coupling circuit and decoupling circuit, coupling circuit includes coupling capacitor and coupling isolation inductance, interference signal generator is connected to coupling capacitor's one end, and coupling inductor's the other end is connected to the EUT port through coupling isolation inductance, coupling capacitor is used for passing through coupling isolation inductance couples interference signal to two measured lines simultaneously; the decoupling circuit comprises a decoupling capacitor, a decoupling isolation inductor and a common-mode inductor, wherein the first end of the decoupling capacitor is connected to a center tap of the decoupling isolation inductor, the second end of the decoupling capacitor is grounded, and two ends of the decoupling isolation inductor are correspondingly connected to an AE port; one side of the common mode inductor is connected to the EUT port, and the other side of the common mode inductor is connected to the AE port. The utility model discloses a signal isolation inductance keeps apart the signal conduction between the measured line, can transmit the unattenuated transmission of interfering signal for the measured line simultaneously.
Description
Technical Field
The application belongs to the technical field of network signal transmission, and particularly relates to a coupling/decoupling network and an anti-interference test system.
Background
The high-speed coupling/decoupling network is used for simultaneously coupling interference signals in multiple lines of a non-frequency symmetric line (high-speed transmission line) in the national standard GB/T17626.18 and evaluating the anti-interference capability of a tested product.
The coupling circuit in the coupling/decoupling network can couple the interference signal to be tested to the circuit to be tested, and can isolate the useful signal on the circuit to be tested, so as to prevent the signals on different circuits from being conducted with each other, so that the signals cannot work normally, and the anti-interference capability of the product to be tested cannot be judged.
The decoupling circuit in the coupling/decoupling network is used for decoupling the tested interference signal and enabling the useful transmission signal in the tested line to be normally transmitted in the line.
Coupling/decoupling devices selected in coupling/decoupling circuits on the market at present are mainly capacitors, and a small number of GDTs (gas discharge tubes) are also used. The use of capacitors can cause short-circuit of communication signals between the lines under test. Adopt GDT, because GDT can produce the spark of discharging during operation, seriously influence experimental wave form, last long-time work moreover, easily damage.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the coupling/decoupling network among the mainly used solution prior art if adopt the condenser, causes the communication signal short circuit between the measured line easily, if adopt GDT, the during operation can produce the spark of discharging, seriously influences experimental wave form, lasts long-time work moreover, the problem of easy damage.
In order to solve the technical problem, the utility model provides a coupling/decoupling network and anti-interference test system, the utility model discloses a coupling/decoupling network adopts the condenser realize, couple interfering signal to two simultaneously through a coupling capacitance by the survey line on, avoid two short circuits at the coupling capacitance end between being surveyed the line simultaneously, set up isolation inductance between two being surveyed the line to keep apart two signals between being surveyed the line and switch on, can transmit the non-attenuated transmission of interfering signal that the coupling capacitance coupling was come on being surveyed the line simultaneously.
The utility model discloses a technical scheme specifically do:
the utility model discloses a first aspect provides a coupling/decoupling network, coupling/decoupling network connects between auxiliary assembly and equipment under test, including coupling circuit and decoupling circuit, EUT port is connected to one side of coupling circuit, the other side of coupling circuit passes through the decoupling circuit and connects the AE port;
the coupling circuit comprises a coupling capacitor and a coupling isolation inductor, wherein a first end of the coupling capacitor is used for connecting an interference signal generator, a second end of the coupling capacitor is connected to a center tap of the coupling isolation inductor, two ends of the coupling isolation inductor are correspondingly connected to an EUT port, and the coupling capacitor is used for coupling interference signals to two tested wires simultaneously through the coupling isolation inductor;
the decoupling circuit comprises a decoupling capacitor, a decoupling isolation inductor and a common-mode inductor, wherein the first end of the decoupling capacitor is connected to a center tap of the decoupling isolation inductor, the second end of the decoupling capacitor is grounded, and two ends of the decoupling isolation inductor are correspondingly connected to an AE port; one side of the common mode inductor is connected to the EUT port, and the other side of the common mode inductor is connected to the AE port.
The utility model discloses the second aspect provides an anti-interference test system, including the interfering signal generator for produce the test with interfering signal, still include the first aspect the coupling/network of decoupling.
The utility model has the advantages that: the utility model discloses coupling circuit couples two measured lines simultaneously through a coupling capacitance, is about to the interference signal and couples to two measured lines simultaneously on, keeps apart two measured lines between the signal switch on through setting up signal isolation inductance, can guarantee the undistorted transmission of interference signal for measured line with the non-attenuated transmission of interference signal that coupling capacitance coupling comes simultaneously, moreover under the coupling capacitance coupling condition, guarantees network transmission 1000Mbit rate signal.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a schematic diagram of a coupling and decoupling network structure according to an embodiment of the present application;
fig. 2 is a circuit schematic diagram of a coupling and decoupling network according to an embodiment of the present application.
Reference numerals in the drawings: 1-coupling circuit, 2-decoupling circuit.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
This embodiment 1 provides a coupling/decoupling network for a product, as shown in fig. 1, including:
the coupling/decoupling network is connected between Auxiliary Equipment (AE) and Equipment Under Test (EUT), and comprises a coupling circuit and a decoupling circuit, wherein one side of the coupling circuit is connected with an EUT port, and the other side of the coupling circuit is connected with an AE port through the decoupling circuit;
the coupling circuit 1 comprises a coupling capacitor (C)o1、Co2) The first end of the coupling capacitor is used for connecting an interference signal generator, the second end of the coupling capacitor is connected to a center tap of the coupling isolation inductor, two ends of the coupling isolation inductor are correspondingly connected to the EUT port, and the coupling capacitor is used for coupling interference signals to two tested wires simultaneously through the coupling isolation inductor;
the decoupling circuit 2 comprises a decoupling capacitor (C)q1、Cq2) The common-mode inductor comprises decoupling isolation inductors (L3, L4) and a common-mode inductor (L5), wherein a first end of each decoupling capacitor is connected to a center tap of each decoupling isolation inductor, a second end of each decoupling capacitor is grounded, and two ends of each decoupling isolation inductor are correspondingly connected to an AE port; the common modeOne side of the inductor is connected to the EUT port, and the other side of the common mode inductor is connected to the AE port.
The coupling and decoupling network of the embodiment is connected between the device to be tested and the auxiliary device, and the input end of the coupling and decoupling network is connected with the signal output end of the interference signal generator, and is used for receiving the test interference signal transmitted by the interference signal generator and coupling the test interference signal to the device to be tested.
In the coupling circuit of this embodiment, one coupling capacitor couples two lines under test at the same time, that is: and simultaneously coupling the test interference signals generated by the interference signal generator to the two tested wires. Because the two tested lines are short-circuited at the coupling capacitor end, a decoupling isolation inductor is added for isolating signal conduction between the two tested lines, and simultaneously, interference signals coupled by the coupling capacitor can be transmitted to the tested lines of tested Equipment (EUT) without attenuation.
When the coupling/decoupling network of the embodiment is used, firstly, a corresponding interference signal is selected according to the tested device, the interference signal is transmitted to the coupling/decoupling network of the embodiment through an interference signal generator (for example, an RF circuit), the interference signal is transmitted to the tested device after being coupled through a coupling circuit part, and a coupling capacitor in the coupling circuit couples the interference signal to two tested lines at the same time. Most of interference signals in signal transmission are prevented by the common-mode inductor from being absorbed and changed into magnetic induction and heat energy, most of the rest interference signals are bypassed to the ground by the decoupling capacitor, the anti-interference performance is improved, and the decoupling circuit can effectively ensure that the coupled interference signals cannot be transmitted to Auxiliary Equipment (AE) to influence the work of the embodiment.
As shown in fig. 2, the coupling capacitor of this embodiment includes a first coupling capacitor Co1A second coupling capacitor Co2The coupling isolation inductor comprises a first isolation inductor L1 and a second isolation inductor L2;
the first coupling capacitor Co1A center tap connected to the first isolating inductor L1, the secondCoupling capacitor Co2And the center tap of the second isolation inductor L2 is connected, and two ends of the first isolation inductor L1 and the second isolation inductor L2 are respectively and correspondingly connected to the EUT port.
Both the EUT port and the AE port of the embodiment are of a three-phase four-wire system, and the set ports are L in sequence01Terminal, L02Terminal, L03Terminal and N terminal. Two coupling capacitors, the first one C, are arranged in the coupling circuito1A first isolation inductor L1 is arranged between the two corresponding tested wires, and two ends of the first isolation inductor L1 are respectively connected to the L corresponding to the EUT port01、L02And (4) an end. Second coupling capacitor Co2A second isolation inductor L2 is arranged between the two corresponding tested lines, and two ends of the first isolation inductor L2 are respectively connected to the L of the EUT port03And an N terminal.
A first coupling capacitor Co1A second coupling capacitor Co2The second ends of the first and second terminals are connected to a signal output port of the interference signal generator, and are used for coupling the received interference signals to two corresponding tested wires.
Optionally, the decoupling capacitor comprises a first decoupling capacitor Cq1A second decoupling capacitor Cq2The decoupling isolation inductor comprises a third isolation inductor L3 and a fourth isolation inductor L4;
the first decoupling capacitor Cq1Is connected to the center tap of the third isolating inductor L3, said second decoupling capacitor Cq2The first end of the third isolation inductor L3 is connected to the center tap of the fourth isolation inductor L4, and two ends of the third isolation inductor L3 and the fourth isolation inductor L4 are respectively and correspondingly connected to two tested lines;
the common mode inductor adopts a magnetic core matched with the frequency of an interference signal, and the winding adopts a twisted pair to wind on the magnetic core material at the same time, so that the three-phase four-wire common mode inductor is formed.
L of AE port in the present embodiment01Terminal, L02And a third isolation inductor L3 and a fourth isolation inductor L4 are arranged between the lines corresponding to the ends, so that signal conduction between the two lines can be isolated, and short circuit is avoided. The first decoupling capacitor Cq1Is connected with the second end of the resistor through a connecting resistor RBGround, said second decoupling capacitor Cq2By connecting a resistor RAAnd (4) grounding. Facilitating the passage of interfering signals through the first decoupling capacitor Cq1A second decoupling capacitor Cq2And the interference signals are transmitted to the ground, so that the influence of the interference signals on signal transmission is reduced.
The decoupling network of the embodiment is provided with the common-mode inductor L5, and the common-mode inductor L5 is formed by winding a twisted pair on a magnetic core material at the same time, so that the coupled interference signals are prevented from being absorbed, magnetic induction and heat energy are formed, and the influence of the interference signals on signal transmission is reduced. The common mode inductor L5 uses a magnetic core material matching the frequency of the interference signal, and has high magnetic permeability to reduce the winding length of the wound inductor. The winding method adopts the twisted pair to wind on the magnetic core material at the same time, so that the problem that EMC interference is generated under the condition of high signal transmission rate during single-phase winding, and the signal cannot be normally transmitted is avoided.
Optionally, in this embodiment, the winding of the coupling isolation inductor is wound in a single direction for 2n turns, and a tap at the center of the nth turn is connected to the first coupling capacitor.
The coupling isolation inductor adopts a high-frequency high-magnetic-flux material, so that the winding length of the inductor is reduced (the influence on the waveform of an interference signal is avoided). The coupling isolation inductance winding adopts a single direction to wind 2n turns, and a tap at the center of the nth turn is connected with the coupling capacitor.
Seen from the winding end of the coupling isolation inductor, 2n turns of high-frequency inductive reactance are provided, and high impedance is formed for communication signals between two tested wires. The two ends of the inductor are seen from the middle point of the coupled isolated inductor winding, and the inductance values are mutually offset; therefore, the injected interference signal is not affected by inductive reactance, and the test interference signal is not distorted.
Optionally, the winding of the decoupling isolation inductor is wound in a single direction for 2n turns, and a tap at the center of the nth turn is connected with the decoupling capacitor.
The decoupling isolation inductor adopts a high-frequency high-magnetic-flux material, so that the winding length of the inductor is reduced (the influence on the waveform of an interference signal is avoided). The coupling isolation inductor winding adopts a single direction to wind 2n turns, and a tap at the center of the nth turn is connected with the decoupling capacitor.
Seen from the winding end of the decoupling isolation inductor, 2n turns of high-frequency inductive reactance are provided, and high impedance is formed for communication signals between two tested wires. The two ends of the inductor are seen from the middle point of the winding of the decoupling isolation inductor, and the inductance values are mutually offset; therefore, the injected interference signal has no inductive reactance influence, and the test interference signal does not distort transmission.
The signal isolation inductor is arranged to isolate the signal conduction between the two tested lines, and meanwhile, interference signals coupled by the coupling capacitor can be transmitted to the tested lines without attenuation to ensure that the interference signals are transmitted without distortion. The coupling isolation inductance winding adopts a single direction to wind 2n turns, and a tap is arranged at the center of the nth turn for connecting a coupling capacitor. When viewed from the winding end of the coupling inductor, the coupling inductor has 2n turns of high-frequency inductive reactance, and forms high resistance for communication signals between two tested wires. The two ends of the inductor are seen from the middle point of the winding of the coupling inductor, and the inductance values are mutually counteracted, so that no inductive reactance influence is caused on the injected interference signals.
The second embodiment of the present invention further provides an anti-interference test system, which comprises an interference signal generator for generating an interference signal for testing, and a coupling/decoupling network according to the first embodiment.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. A coupling/decoupling network connected between an accessory and a device under test, comprising a coupling circuit and a decoupling circuit, one side of the coupling circuit being connected to an EUT port and the other side of the coupling circuit being connected to an AE port via the decoupling circuit, characterized in that:
the coupling circuit comprises a coupling capacitor and a coupling isolation inductor, wherein a first end of the coupling capacitor is used for connecting an interference signal generator, a second end of the coupling capacitor is connected to a center tap of the coupling isolation inductor, two ends of the coupling isolation inductor are correspondingly connected to an EUT port, and the coupling capacitor is used for coupling interference signals to two tested wires simultaneously through the coupling isolation inductor;
the decoupling circuit comprises a decoupling capacitor, a decoupling isolation inductor and a common-mode inductor, wherein the first end of the decoupling capacitor is connected to a center tap of the decoupling isolation inductor, the second end of the decoupling capacitor is grounded, and two ends of the decoupling isolation inductor are correspondingly connected to an AE port; one side of the common mode inductor is connected to the EUT port, and the other side of the common mode inductor is connected to the AE port.
2. The coupling/decoupling network of claim 1 wherein the coupling isolation inductor is wound in a single direction for 2n turns, and the n-th turn is tapped at the center thereof and connected to the coupling capacitor.
3. The coupling/decoupling network of claim 1 wherein the decoupling isolation inductor is wound in a single direction for 2n turns, and a tap is connected to the decoupling capacitor at a center of the n-th turn.
4. The coupling/decoupling network of claim 2 wherein said coupling capacitance comprises a first coupling capacitance Co1A second coupling capacitor Co2The coupling isolation inductor comprises a first isolation inductor L1 and a second isolation inductor L2;
the first coupling capacitor Co1A center tap connected to the first isolating inductor L1, and a second coupling capacitor Co2And the center tap of the second isolation inductor L2 is connected, and two ends of the first isolation inductor L1 and the second isolation inductor L2 are respectively and correspondingly connected to the EUT port.
5. The coupling/decoupling network of claim 3 wherein said decoupling capacitance comprises a first decoupling capacitance Cq1A second decoupling capacitor Cq2The decoupling isolation inductor comprises a third isolation inductor L3 and a fourth isolation inductor L4;
the first decoupling capacitor Cq1Is connected to the center tap of the third isolating inductor L3, said second decoupling capacitor Cq2The first end of the third isolation inductor L3 is connected to the center tap of the fourth isolation inductor L4, and two ends of the third isolation inductor L3 and the fourth isolation inductor L4 are respectively and correspondingly connected to the two lines to be tested.
6. The coupling/decoupling network of claim 5 wherein the common mode inductor is a magnetic core frequency matched to the interfering signal and the windings are twisted pairs simultaneously on the magnetic core material to form a three-phase four-wire common mode inductor.
7. The coupling/decoupling network of claim 5 wherein said first decoupling capacitor Cq1Is connected with the second end of the resistor through a connecting resistor RBGround, said second decoupling capacitor Cq2By connecting a resistor RAAnd (4) grounding.
8. An anti-tamper test system comprising a jamming signal generator for generating a jamming signal for testing, further comprising a coupling/decoupling network according to any of claims 1 to 7.
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| CN112217582A (en) * | 2020-10-26 | 2021-01-12 | 苏州泰思特电子科技有限公司 | Coupling/decoupling network and anti-interference test system |
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| CN112217582A (en) * | 2020-10-26 | 2021-01-12 | 苏州泰思特电子科技有限公司 | Coupling/decoupling network and anti-interference test system |
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