CN108562767B - Coaxial type conduction interference protection device performance test fixture - Google Patents
Coaxial type conduction interference protection device performance test fixture Download PDFInfo
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- CN108562767B CN108562767B CN201810312291.6A CN201810312291A CN108562767B CN 108562767 B CN108562767 B CN 108562767B CN 201810312291 A CN201810312291 A CN 201810312291A CN 108562767 B CN108562767 B CN 108562767B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention belongs to the technical field of electromagnetic pulse injection, aims to overcome the defects of the existing high-altitude electromagnetic pulse testing clamp, provides a coaxial type conduction interference protection device performance testing clamp, and aims to realize pulse injection testing of a protection device in a working state. Compared with the inductance introduced by the prior double-line structure, the inductance introduced in the ideal case is zero, the distortion of the pulse injection signal caused by the inductance introduced by the transmission line is greatly reduced, the waveform front edge and the pulse width distortion rate are both smaller than 0.3dB, and the pulse injection test of the protection device under the normal working environment can be realized.
Description
Technical Field
The invention belongs to the technical field of electromagnetic pulse injection, and relates to a performance test fixture for a conductive interference protection device, which can be applied to high-altitude electromagnetic pulse (HEMP) effect test.
Background
For a long time, high-altitude nuclear explosion electromagnetic pulse and engineering protection technology thereof have been receiving general attention from various countries, and the communication committee (TC-77) of IEC (International Electro technical) lists the pulse as a high-power electromagnetic environment in which civil electronic equipment, electronic systems and devices need to be protected. IEC61000-2-9 published in 1996 and MIL-STD-461E published in 1999 in U.S. are both assigned a HEMP waveform peak of 2.5+ -0.5 ns leading edge and 23+ -5 ns full width at half maximum (FWHM). The standard published by IEC61000-2-10 published in 1998 specifies a HEMP conduction waveform with a leading edge/pulse width of 10/100ns and a buried cable of 25/500ns.
With the importance of various countries on damage to various electronic and electric equipment caused by high-altitude electromagnetic pulses, research on the HEMP effect and the protection technology becomes a hotspot in the field, and higher requirements are also put on the HEMP test platform, the measurement system and the test fixture. The existing test fixture designed according to international standard IEC61000-4-24 is shown in fig. 1, a protective device core wire A7 and a cylindrical protective device partition board (fixed on the protective partition board A1) are arranged in a non-protective end chamber A5, a protective device A6 is connected between the protective device core wire A7 and the protective device partition board, pulse signals are directly injected through a coaxial interface A3, and an assessment test of the protective device A6 is realized.
The clamp has the defects that the clamp can only be used for testing the device in a laboratory environment, and cannot be used for testing the device in an actual working voltage environment, if the clamp is used for testing high-altitude electromagnetic pulse, the test result and the actual deviation are larger for the protection performance test of voltage type protection devices such as a gas discharge tube, a piezoresistor and the like of a power line or other charged equipment.
Disclosure of Invention
In order to overcome the defects of the existing high-altitude electromagnetic pulse testing clamp, the invention provides a coaxial type conduction interference protection device performance testing clamp, and aims to realize pulse injection testing of the protection device in a working state.
The technical scheme of the invention is as follows:
the utility model provides a coaxial type conduction interference protection device capability test anchor clamps which characterized in that: the device comprises a shell made of good conductor materials, a coupler, a decoupler, a to-be-tested protection device fixing pile and two measuring probes, wherein the coupler, the decoupler and the to-be-tested protection device fixing pile are arranged in the shell;
the shell is a hollow cylindrical closed shell, two end faces of the shell are respectively provided with a load matching port and a power supply port of a to-be-tested protective device, and pulse injection ports are arranged on the side wall of the shell and perpendicular to the axis direction of the shell;
the load matching port is connected with the power supply port of the to-be-tested protection device through a first transmission wire; a measuring probe, an isolating structure and a decoupler are sequentially arranged on the first transmission lead along the direction that the load matching port points to the power supply port of the to-be-tested protection device; the isolation structure comprises a shielding separator and an insulating medium; the shielding partition plate is a metal plate, a first central through hole is formed in the shielding partition plate, and the insulating medium is arranged in the first central through hole; the center of the insulating medium is provided with a second center through hole, the insulating medium and the shielding partition plate are integrally arranged on the first transmission guide line through the second center through hole, and the edge of the shielding partition plate is connected with the inner wall of the shell;
the shielding partition board, the load matching port, the power supply port of the to-be-tested protection device and the shell are coaxially arranged;
the decoupler is positioned between the pulse injection port and the power supply port of the to-be-tested protective device;
along the radial direction of the shell, a second transmission wire, a coupler and a third transmission wire which are sequentially connected are arranged at the pulse injection port; a fixing pile of the protective device to be tested is arranged on the inner wall of the shell at the position corresponding to the third transmission wire; the third transmission wire intersects the first transmission wire;
defining the end face of the shielding partition plate, which faces the power supply port of the to-be-tested protective device, as a first end face, wherein at least three insulating supports are arranged on the first end face: at least one insulating support is connected with the lower part of the second transmission wire, at least one insulating support is connected with the lower part of the third transmission wire, at least one insulating support is connected with the upper part of the third transmission wire, and gaps are reserved between the coupler and the insulating support and between the to-be-tested protective device and the insulating support;
and a measuring probe is also arranged on the third transmission lead and is positioned between the first transmission lead, the fixing pile of the to-be-tested protective device, the shielding partition plate and the decoupler.
Further, the coupler adopts a coupling capacitor, and the decoupler adopts a decoupling magnetic ring.
Further, the capacitance value of the coupling capacitor and the initial magnetic permeability of the decoupling magnetic ring are determined according to the pulse injected as required.
Further, for the high-altitude electromagnetic pulse with the front edge/pulse width of 10/100ns, the capacitance value of the coupling capacitor is 3uF, and the initial magnetic conductivity of the decoupling magnetic ring is a ferrite magnetic ring with 1000.
Furthermore, the measuring probe adopts 2877-type Rogowski coil, the 3dB bandwidth is 300 Hz-200 MHz, and the pulse signal with rising edge of 2ns can be measured.
The invention has the beneficial effects that:
1. compared with the inductance introduced by the prior double-line structure, the inductance introduced in the ideal case is zero, the distortion of the pulse injection signal caused by the inductance introduced by the transmission line is greatly reduced, the waveform front edge and the pulse width distortion rate are both smaller than 0.3dB, and the pulse injection test of the protection device under the normal working environment can be realized. In addition, the coaxial structure also enables the power supply port to form port matching with the injection port, and port reflection is reduced.
2. The coupler adopts a coupling capacitor, and presents low impedance to the pulse of the pulse source and high impedance to the working power supply; in addition, the decoupler adopts a decoupling magnetic ring with high magnetic conductivity, and presents high impedance to the pulse of the pulse source and low impedance to the working power supply, so that the pulse injection is ensured, and the mutual interference between the pulse source and the working power supply is avoided.
3. The invention designs a measuring probe by considering the following three points: firstly, the smaller the insertion loss of a measuring probe is, the smaller the disturbance to a measured signal is; secondly, the measuring probe should have enough bandwidth and response speed; thirdly, the signal after protection should be shielded with the signal before protection by the space electromagnetic field, so as to avoid secondary interference. Therefore, the measuring probe adopts 2877-type Rogowski coil, the 3dB bandwidth is 300 Hz-200 MHz, and the pulse signal with the rising edge of 2ns can be measured.
4. According to the invention, the to-be-tested protection device is separated from the power supply port of the to-be-tested protection device by the shielding partition plate, so that secondary interference caused by coupling in the cavity is avoided, and the protection performance of the to-be-tested protection device can be more accurately evaluated.
5. The invention adopts a coaxial structure, which is more beneficial to the installation of the decoupling magnetic ring and the measuring probe.
6. The invention can realize pulse injection test of the protective device in a normal working state, the power supply of the device is 0-380V (DC-1 kHz), the parameters of the supporting pulse injection waveform are 0-3 kV (1 kHz-100 MHz), the rising edge tr=10ns-1 us, and the characteristic impedance is 50Ω.
7. The invention is a standard device-level pulse injection test fixture, is convenient for the comparison and analysis of various devices, and is suitable for the test of various electromagnetic pulse signals (nuclear electromagnetic pulse, lightning electromagnetic pulse, switch discharge electromagnetic pulse and the like) at present.
Drawings
FIG. 1 is a schematic diagram of a test fixture recommended in IEC 61000-4-24;
FIG. 2 is a schematic diagram of a pulse injection test fixture according to the present invention;
FIG. 3 is a schematic diagram of a test fixture circuit of the present invention (UT is the device under test);
fig. 4 is an S-parameter of a pulse injection test fixture of the present invention, wherein:
s12 is the forward transmission coefficient from the load matching port 10 to the port 11 of the protection device to be tested when the power supply port 11 of the protection device to be tested is connected with the matching load;
s13, when the power supply port 11 of the to-be-tested protection device is connected with a matched load, the forward transmission coefficient from the pulse injection port 9 to the port 11 of the to-be-tested protection device is calculated;
s21 is a forward transmission coefficient from the port 11 of the protection device to be tested to the pulse injection port 10 when the load matching port 10 is connected with a matched load;
s23 is the forward transmission coefficient from the pulse injection port 9 to the load matching port 10 when the load matching port 10 is connected with a matching load;
FIG. 5 is a pulse injection test fixture port impedance of the present invention, wherein Z 1 Characteristic impedance Z of power supply port 11 for protective device to be tested 2 Matching the characteristic impedance, Z, of port 10 for load 3 Is the characteristic impedance of the pulse injection port 9;
FIG. 6 is a schematic diagram showing the actual measurement effect of a dual index pulse wave injection test fixture of the present invention;
FIG. 7 is a schematic diagram of the coupling and decoupling effects of a test fixture of the present invention by pulse injection;
reference numerals illustrate:
a1-shielding partition board, A2-threaded connection, A3-coaxial interface, A4-protection end cell, A5-non-protection end cell, A6-protection device, A7-core wire, A8-protection device core wire fixing end and A9-protection device partition board fixing end.
The device comprises a 1-decoupler, a 2-measuring probe, a 3-coupler, a 4-protection device to be tested, a 5-insulating support, a 6-insulating medium, a 7-shielding baffle, an 8-shell, a 9-pulse injection port, a 10-load matching port, a 11-power supply port of the protection device to be tested, a 12-first transmission wire, a 13-second transmission wire, a 14-third transmission wire and a 15-protection device to be tested fixing pile.
Detailed Description
As shown in fig. 2, the performance test fixture for the coaxial type conductive interference protection device provided by the invention comprises a shell 8 made of good conductor materials (with better conductivity), a coupler 3 arranged in the shell 8, a decoupler 1, a measuring probe 2, a fixing pile 15 for the protection device to be tested, a shielding structure and an insulating bracket 5;
the whole shell 8 is of a hollow cylindrical closed structure, a power supply port 11 and a load matching port 10 of a to-be-tested protection device are respectively arranged on two end surfaces of the shell and at the axis of the shell 8, a pulse injection port 9 is arranged on the side wall of the shell, and the axis of the pulse injection port 9 is perpendicular to the axis of the shell 8;
the power supply port 11 of the protection device to be tested is connected with the load matching port 10 through a first transmission wire; the measuring probe 2, the isolation structure and the decoupler 1 are sequentially arranged on the first transmission lead along the direction that the load matching port 10 points to the power supply port 11 of the to-be-measured protection device; the isolation structure comprises a shielding separator 7 and an insulating medium 6; the shielding separator 7 is a metal plate which is completely and electrically communicated, a first central through hole is formed in the metal plate, and the insulating medium 6 is arranged in the first central through hole; a second central through hole is formed in the center of the insulating medium 6, the insulating medium 6 and the shielding partition 7 are integrally arranged on the first transmission guide line through the second central through hole (namely, the shielding partition 7 is coaxially arranged with the load matching port 10, the power supply port 11 of the to-be-tested protection device and the shell 8), and the edge of the shielding partition 7 is connected with the inner wall of the shell 8; the decoupler 1 is positioned between the pulse injection port 9 and the power supply port 11 of the protection device to be tested;
along the radial direction of the shell 8, the pulse injection port 9 is connected with the inner wall of the shell 8 through the second transmission wire, the coupler 3, the third transmission wire, the to-be-detected protection device 4 and the to-be-detected protection device fixing pile 15 in sequence; the third transmission wire intersects the first transmission wire;
defining the end face of the shielding partition 7 facing the power supply port 11 of the to-be-tested protective device as a first end face and the end face facing the load matching port 10 as a second end face, and arranging at least three insulating brackets 5 on the first end face of the shielding partition 7; at least one insulating support 5 is connected with the lower part of the second transmission wire and the lower part of the third transmission wire; at least one insulating support 5 is connected to the upper part of the third transmission line; gaps are formed between the coupler 3 and the insulating support 5 and between the to-be-tested protective device 4 and the insulating support 5;
a measuring probe 2 is also arranged on the third transmission wire, and the measuring probe 2 is positioned between the first transmission wire and the to-be-measured protection device 4 and is also positioned between the shielding partition 7 and the decoupler 1;
of the two measuring probes 2, the measuring probe 2 on the third transmission line is used for measuring the dynamic performance of the to-be-measured protection device, and the measuring probe 2 on the first transmission line is used for measuring the protection effect of the to-be-measured protection device.
In order to realize the protection performance test of the protection device under the normal working voltage, the pulse is required to be coupled to the protection device, and meanwhile, the coupling between a pulse source and a power supply is avoided; the capacitance value of the coupling capacitor and the initial magnetic permeability of the decoupling magnetic ring can be selected according to the pulse which is injected according to specific requirements, and for the high-altitude electromagnetic pulse which is injected in the test process of the invention, the coupling capacitor is generally about 1uF, and the decoupling magnetic ring is generally a ferrite magnetic ring with the initial magnetic permeability of about 1000. In other embodiments, the decoupler 1 may also employ inductors, coils, etc. of non-cylindrical construction; the coupler 3 may also be a directional coupler.
Pulse injection the schematic circuit diagram of the test fixture of the present invention is shown in FIG. 3, U p For the injected pulse signal, U 0 For the normal working voltage of the protected device and the to-be-detected protection device, the #1 measuring probe is used for measuring the dynamic performance of the to-be-detected protection device, and the #2 measuring probe is used for measuring the protection effect of the to-be-detected protection device.
Fig. 4 shows that the S parameter of the test fixture of the present invention is pulse injected, and the forward transmission coefficient from the pulse injection port 9 to the protection device port (i.e., the load matching port 10) tends to be 1 in the range of 10kHz-100MHz, i.e., the pulse can be completely injected onto the protection device to be tested, which is desirable for design.
Fig. 5 shows the port impedance of the pulse injection test fixture according to the present invention, and it can be seen that the characteristic impedance of the power supply port 11, the pulse injection port 9 and the load matching port 10 of the protection device to be tested is 50Ω (error less than 1%).
Fig. 6 is a measurement waveform of a double-exponential pulse wave injected into the pulse injection port 9, and by comparing the voltage waveform of the source open circuit output voltage and the voltage waveform of the pulse current injected into the test fixture of the present invention coupled to the load (i.e., the protected device) with the voltage waveform of the conventional wiring on the load, it can be seen that the waveform of the pulse injected into the test fixture of the present invention is almost identical to the source open circuit output voltage waveform, and the conventional wiring causes the rising edge of the pulse to be slowed down and the waveform to be partially distorted due to the line loop inductance and the like.
Fig. 7 shows the decoupling effect of the test fixture according to the present invention by examining pulse injection, and it can be seen that the waveform front measured by the decoupling end is slowed down, and the amplitude is below 200V, so that the influence on the power supply is greatly reduced.
Claims (5)
1. A coaxial type conduction interference protection device performance test fixture is characterized in that: the device comprises a shell (8) made of good conductor materials, a coupler (3) arranged in the shell (8), a decoupler (1), a to-be-tested protection device fixing pile (15) and two measuring probes (2);
the shell (8) is a hollow cylindrical closed shell, two end faces of the shell (8) are respectively provided with a load matching port (10) and a power supply port (11) of a to-be-tested protective device, and pulse injection ports (9) are arranged on the side wall of the shell (8) and perpendicular to the axis direction of the shell;
the load matching port (10) is connected with the power supply port (11) of the protection device to be tested through a first transmission wire (12); a measuring probe (2), an isolation structure and a decoupler (1) are sequentially arranged on a first transmission wire (12) along the direction that a load matching port (10) points to a power supply port (11) of a to-be-tested protective device; the isolation structure comprises a shielding separator (7) and an insulating medium (6); the shielding partition plate (7) is a metal plate, a first central through hole is formed in the metal plate, and the insulating medium (6) is arranged in the first central through hole; a second central through hole is formed in the center of the insulating medium (6), the insulating medium (6) and the shielding partition plate (7) are integrally arranged on the first transmission wire (12) through the second central through hole, and the edge of the shielding partition plate (7) is connected with the inner wall of the shell (8); the shielding partition plate (7), the load matching port (10), the power supply port (11) of the protective device to be tested and the shell (8) are coaxially arranged;
the decoupler (1) is positioned between the pulse injection port (9) and the power supply port (11) of the protective device to be tested;
along the radial direction of the shell (8), a second transmission wire (13), a coupler (3) and a third transmission wire (14) which are connected in sequence are arranged at the pulse injection port (9); a fixing pile (15) of the protective device to be tested is arranged on the inner wall of the shell (8) at the position corresponding to the third transmission wire (14); the third transmission line (14) intersects the first transmission line (12);
defining the end face of the shielding partition plate (7) facing the power supply port (11) of the to-be-detected protective device as a first end face, and arranging at least three insulating brackets (5) on the first end face: at least one insulating support (5) is connected with the lower part of the second transmission wire (13), at least one insulating support (5) is connected with the lower part of the third transmission wire (14), at least one insulating support (5) is connected with the upper part of the third transmission wire (14), and gaps are reserved between the coupler (3) and the insulating support (5) and between the to-be-detected protection device (4) and the insulating support (5);
a measuring probe (2) is also arranged on the third transmission wire (14), and the measuring probe (2) is positioned between the first transmission wire (12), the fixing pile (15) of the protective device to be tested, the shielding partition plate (7) and the decoupler (1).
2. The coaxial type conduction interference protector performance test fixture of claim 1, wherein: the coupler (3) adopts a coupling capacitor, and the decoupler (1) adopts a decoupling magnetic ring.
3. The coaxial type conduction interference protector performance test fixture of claim 2, wherein: the capacitance value of the coupling capacitor and the initial magnetic permeability of the decoupling magnetic ring are determined according to the pulse which is injected as required.
4. The coaxial type conducted interference protection device performance test fixture according to claim 3, wherein: for high-altitude electromagnetic pulse with the front edge/pulse width of 10/100ns, the capacitance value of the coupling capacitor is 3uF, and the initial magnetic conductivity of the decoupling magnetic ring is 1000.
5. The coaxial type conducted interference protection device performance test fixture according to any one of claims 1 to 4, wherein: the measuring probe (2) adopts 2877-type Rogowski coil, the 3dB bandwidth is 300 Hz-200 MHz, and the pulse signal with rising edge of 2ns can be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810312291.6A CN108562767B (en) | 2018-04-09 | 2018-04-09 | Coaxial type conduction interference protection device performance test fixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810312291.6A CN108562767B (en) | 2018-04-09 | 2018-04-09 | Coaxial type conduction interference protection device performance test fixture |
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| CN108562767A CN108562767A (en) | 2018-09-21 |
| CN108562767B true CN108562767B (en) | 2023-09-01 |
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| CN201810312291.6A Active CN108562767B (en) | 2018-04-09 | 2018-04-09 | Coaxial type conduction interference protection device performance test fixture |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110726896A (en) * | 2019-11-21 | 2020-01-24 | 深圳天祥质量技术服务有限公司 | Radio frequency field induced conduction current injection testing device |
| CN112798863A (en) * | 2020-12-30 | 2021-05-14 | 西北核技术研究所 | Totally-enclosed and calibratable magnetic ring impedance measurement clamp and magnetic ring impedance measurement method |
| CN112994715B (en) * | 2021-02-03 | 2022-02-18 | 深圳市速联技术有限公司 | Ultra-wideband radio frequency link strong electromagnetic pulse protection method and device |
| CN115149236B (en) * | 2022-07-25 | 2023-05-02 | 西安交通大学 | Non-contact capacitive coupling device for high-altitude electromagnetic pulse conduction interference injection and use method thereof |
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| US4814713A (en) * | 1987-01-21 | 1989-03-21 | G & H Technology, Inc. | Coaxial test fixture for determining shielding effectiveness of a device against interfering electromagnetic fields |
| CN106443287A (en) * | 2016-12-07 | 2017-02-22 | 中国人民解放军军械工程学院 | Coaxial device for testing property of field-sensitive electromagnetic pulse protection material |
| CN208092088U (en) * | 2018-04-09 | 2018-11-13 | 西北核技术研究所 | A kind of coaxial type Conduction Interference protective device performance test fixture |
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2018
- 2018-04-09 CN CN201810312291.6A patent/CN108562767B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4814713A (en) * | 1987-01-21 | 1989-03-21 | G & H Technology, Inc. | Coaxial test fixture for determining shielding effectiveness of a device against interfering electromagnetic fields |
| CN106443287A (en) * | 2016-12-07 | 2017-02-22 | 中国人民解放军军械工程学院 | Coaxial device for testing property of field-sensitive electromagnetic pulse protection material |
| CN208092088U (en) * | 2018-04-09 | 2018-11-13 | 西北核技术研究所 | A kind of coaxial type Conduction Interference protective device performance test fixture |
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| Title |
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| HEMP传导型防护模块测试系统的设计与实现;杜立航;李炎新;高成;;微波学报(04);全文 * |
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