CN114755500B - Connector shielding effectiveness testing device and method - Google Patents
Connector shielding effectiveness testing device and method Download PDFInfo
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- CN114755500B CN114755500B CN202210361717.3A CN202210361717A CN114755500B CN 114755500 B CN114755500 B CN 114755500B CN 202210361717 A CN202210361717 A CN 202210361717A CN 114755500 B CN114755500 B CN 114755500B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0835—Testing shielding, e.g. for efficiency
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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
- G01R1/0425—Test clips, e.g. for IC's
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The embodiment of the invention discloses a connector shielding effectiveness testing device and a connector shielding effectiveness testing method. The device comprises: the test device comprises a first clamp, a second clamp, a reference cable and a test unit; the first clamp clamps the connector to be tested, the shielding part of the connector to be tested is electrically connected with the first clamp, a first shielding cavity is formed in the shielding part of the connector to be tested and the first clamp, and the terminal part and the body of the connector to be tested are both positioned in the first shielding cavity; a second shielding cavity is formed in the second clamp, and the first end of the reference cable is positioned in the second shielding cavity; a wire core at the second end of the reference cable is electrically connected with a terminal part of the connector to be tested, and the shielding layer is electrically connected with the first clamp; the test unit is electrically connected with the terminal part of the connector to be tested, and the test unit at least generates an electromagnetic field in the space around the shielding part of the connector to be tested and is used for detecting the signal intensity of the terminal part of the connector to be tested.
Description
Technical Field
The embodiment of the invention relates to the field of electromagnetic compatibility testing, in particular to a connector shielding effectiveness testing device and method.
Background
With the development of new energy automobiles in China, the high-voltage connector for the new energy automobile is a type of connector which is gradually separated from the traditional high-voltage large-current connector and the traditional low-voltage automobile connector. Compare in traditional high-voltage large current connector, new energy automobile is with high voltage connector's use operating mode is more complicated changeable, consequently has proposed higher requirement to new energy automobile is with high voltage connector's shielding effectiveness.
Unlike high voltage cables, high voltage connectors are not protected by a sheath, the shielding of the high voltage connectors is directly exposed to the environment, and the connection between the high voltage connectors is susceptible to vibration. After long-term exposure to vibration wear or chemical corrosion, the electromagnetic shielding effectiveness of the high-voltage connectors may significantly decrease, resulting in severe interference of the spatial electromagnetic field with the transmission line between the high-voltage connectors. Therefore, it is very necessary to provide a device and a method for testing the shielding effectiveness of a high voltage connector, so as to effectively test and evaluate the shielding effectiveness of the high voltage connector.
Disclosure of Invention
The embodiment of the invention provides a connector shielding effectiveness testing device and method, which are used for effectively testing and evaluating the electromagnetic shielding effectiveness of a high-voltage connector for a new energy automobile.
In a first aspect, an embodiment of the present invention provides a connector shielding effectiveness testing apparatus, where the testing apparatus includes: the device comprises a first clamp, a second clamp, a reference cable and a test unit;
the first clamp clamps a connector to be tested, a shielding part of the connector to be tested is electrically connected with the first clamp, a first shielding cavity is formed in the shielding part of the connector to be tested and the first clamp, and a terminal part and a body of the connector to be tested are both positioned in the first shielding cavity;
a second shielding cavity is formed in the second clamp, and the first end of the reference cable is located in the second shielding cavity; a wire core at the second end of the reference cable is electrically connected with a terminal part of the connector to be tested, and a shielding layer is electrically connected with the first clamp;
the testing unit is electrically connected with the terminal part of the connector to be tested and is used for generating an electromagnetic field at least in the surrounding space of the shielding part of the connector to be tested and detecting the signal intensity of the terminal part of the connector to be tested so as to test the shielding effectiveness of the connector to be tested on the electromagnetic field.
Optionally, the first clamp comprises a first sub-clamp and a second sub-clamp; the connector to be tested is clamped between the first sub-clamp and the second sub-clamp; the terminal part and the body of the connector to be tested are both positioned in the first sub-clamp and the second sub-clamp, and the shielding part of the connector to be tested is positioned between the first sub-clamp and the second sub-clamp and is electrically connected with the first sub-clamp and the second sub-clamp.
Optionally, the first sub-clamp comprises a groove located on a first sidewall of the first sub-clamp; the second sub-clamp comprises an opening, and the opening is positioned on a third side wall of the second sub-clamp and penetrates through the third side wall; the terminal part of the connector to be tested comprises a first terminal part and a second terminal part which are opposite; the first terminal part and part of the body of the connector to be tested are positioned in the groove, and the second terminal part and part of the body of the connector to be tested are positioned in the opening.
Optionally, the first sub-clamp further comprises a first through hole; the first through hole is positioned on a second side wall of the first sub-clamp, and the first side wall is opposite to the second side wall; the wire core of the second end of the reference cable is electrically connected with the first terminal part in the first through hole; the connector shielding effectiveness testing device further comprises: a first header and a first coaxial cable; the second sub-clamp further comprises a second through hole, the second through hole is positioned on a fourth side wall of the second sub-clamp, and the third side wall is opposite to the fourth side wall; the first joint is arranged in the second through hole, and the second terminal part is electrically connected with the test unit through the first joint; the first connector is electrically connected with the test unit through a wire core of the first coaxial cable, and a shielding layer of the first coaxial cable is electrically connected with the second sub-clamp through the first connector.
Optionally, the test cell comprises an injection line and a signal subunit; the injection line is electrically connected with the signal output end of the signal subunit, and the signal input end of the signal subunit is electrically connected with the terminal part of the connector to be tested; the signal subunit is configured to input a high-frequency signal to the injection line to generate an electromagnetic field at least in a surrounding space of the shielding portion of the connector to be tested through the injection line, and is configured to detect a signal strength of the terminal portion of the connector to be tested.
Optionally, the method further comprises: a first impedance matching element and a second impedance matching element; one end of the injection line is electrically connected with the signal output end of the signal subunit, the other end of the injection line is electrically connected with the first end of the first impedance matching element, and the second end of the first impedance matching element is electrically connected with the first clamp; the second impedance matching element is connected in series between the core and the shielding layer of the first end of the reference cable.
Optionally, the method further comprises: a second coaxial cable; the injection line is electrically connected with the signal output end of the signal subunit through the wire core of the second coaxial cable, and the shielding layer of the second coaxial cable is electrically connected with the shielding layer of the reference cable.
Optionally, the method further comprises: the signal transmission cable, the second joint and the magnetic ring; the injection line is electrically connected with the core of the second coaxial cable sequentially through the core of the signal transmission cable and the second joint, the shielding layer of the second coaxial cable is electrically connected with the shielding layer of the signal transmission cable through the second joint, and the shielding layer of the signal transmission cable is electrically connected with the shielding layer of the reference cable; the magnetic ring is sleeved on the outer wall of the signal transmission cable.
Optionally, a limiting part is further arranged on the first sub-clamp and/or the second sub-clamp; the limiting part is positioned on the first side wall and/or the third side wall; the limiting part is used for limiting the vertical distance between the first side wall and the third side wall to be not more than a preset clamping safety distance when the first sub-clamp and the second sub-clamp the connector to be tested.
In a second aspect, an embodiment of the present invention further provides a connector shielding effectiveness testing method, using the connector shielding effectiveness testing apparatus according to the first aspect, where the method includes:
clamping a connector to be tested in the first clamp; when the connector is clamped, the shielding part of the connector to be tested is electrically connected with the first clamp, a first shielding cavity is formed in the shielding part of the connector to be tested and the first clamp, and the terminal part and the body of the connector to be tested are both positioned in the first shielding cavity;
generating an electromagnetic field at least in a surrounding space of a shield portion of the connector under test by the test unit;
and detecting the signal intensity of the terminal part of the connector to be tested through the test unit so as to test the shielding effectiveness of the connector to be tested on the electromagnetic field.
According to the technical scheme of the embodiment of the invention, the connector shielding effectiveness testing device comprises a first clamp, a second clamp, a reference cable and a testing unit. The first clamp is used for clamping the connector to be tested; when the first clamp clamps the connector to be tested, the shielding part of the connector to be tested is electrically connected with the first clamp, so that a first shielding cavity is formed in the shielding part of the connector to be tested and the first clamp, and the terminal part and the body of the connector to be tested are both positioned in the first shielding cavity; a second shielding cavity is formed in the second clamp; the first end of the reference cable is positioned in the second shielding cavity, a wire core of the second end of the reference cable is electrically connected with the terminal part of the connector to be tested, and the shielding layer of the second end of the reference cable is electrically connected with the first clamp; the test unit is electrically connected with a terminal part of the connector to be tested. Therefore, the test unit is used for generating an electromagnetic field at least in the surrounding space of the shielding part of the connector to be tested and detecting the signal strength of the terminal part of the connector to be tested, and then the test unit can evaluate the shielding effectiveness of the connector to be tested on the electromagnetic field according to the signal strength of the terminal part of the connector to be tested, so that the test on the electromagnetic field shielding effectiveness of the connector to be tested is realized. The connector shielding effectiveness testing device provided by the embodiment of the invention not only can be suitable for testing the shielding effectiveness of the high-voltage connector of the new energy automobile, but also has the advantages of simple structure, good performance, low cost, easiness in implementation and strong practicability.
Drawings
Fig. 1 is a schematic structural diagram of a connector shielding effectiveness testing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a high-voltage connector for a new energy vehicle according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a first sub-fixture provided in an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a second sub-fixture provided in an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a connector under test held by a first sub-jig and a second sub-jig;
FIG. 6 is another perspective view of the first sub-clip illustrated in FIG. 3;
FIG. 7 is a perspective view of the second sub-fixture illustrated in FIG. 4;
fig. 8 is a flowchart illustrating a method for testing shielding effectiveness of a connector according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a connector shielding effectiveness testing apparatus according to an embodiment of the present invention. Referring to fig. 1, the connector shielding effectiveness testing apparatus includes: a first jig 100, a second jig 200, a reference cable 400, and a test unit 300; the first clamp 100 clamps the connector to be tested, the shielding part of the connector to be tested is electrically connected with the first clamp 100, a first shielding cavity is formed in the shielding part of the connector to be tested and the first clamp 100, and the terminal part and the body of the connector to be tested are both positioned in the first shielding cavity; a second shielding cavity is formed in the second clamp 200, and the first end of the reference cable 400 is located in the second shielding cavity; a wire core at the second end of the reference cable 400 is electrically connected with a terminal part of the connector to be tested, and the shielding layer is electrically connected with the first clamp 100; the testing unit 300 is electrically connected to a terminal portion of the connector to be tested, and the testing unit 300 is configured to generate an electromagnetic field at least in a surrounding space of the shielding portion of the connector to be tested, and is configured to detect a signal strength of the terminal portion of the connector to be tested, so as to test a shielding effectiveness of the connector to be tested against the electromagnetic field.
Specifically, the connector to be tested can be a high-voltage connector for a new energy automobile, the high-voltage connector is used for electrically connecting two electrical devices in the new energy automobile, and the connector to be tested can also be other connectors without wiring harnesses and needing to test the electromagnetic shielding effectiveness.
Exemplarily, fig. 2 is a schematic structural diagram of a high-voltage connector for a new energy vehicle according to an embodiment of the present invention, and referring to fig. 2, the high-voltage connector includes a terminal portion 420, a body 410, and a shielding portion 430. The conductive terminal portions 420 are distributed on two sides of the body 410 to electrically connect corresponding electrical devices on two sides of the body 410, respectively; for example, the terminal portion 420 at one side of the body 410 serves as a first terminal portion 421, the first terminal portion 421 may be used to electrically connect a first electrical device, and the terminal portion at the other side of the body 410 serves as a second terminal portion 422, the second terminal portion 422 is opposite to the first terminal portion 421, and the second terminal portion 422 may be used to electrically connect a second electrical device. The conductive shielding part 430 is located on the outer wall of the body 410 and is disposed around the body 410, and the shielding part 430 functions to shield the space electromagnetic field and prevent the space electromagnetic field from interfering with the high-voltage connector. With continued reference to fig. 2, the shielding part 430 of the high-voltage connector is further provided with a metal spring piece 440, and when the high-voltage connector is electrically connected to the electrical device, the shielding part 430 of the high-voltage connector is electrically connected to the electrical device through the metal spring piece 440; for example, the shield 430 of the high voltage connector is in electrical contact with the metal housing of the electrical device or the shield 430 of the electrical device through the spring pieces 440.
The material of the first fixture 100 may be metal, such as copper; the first clamp 100 is made of copper, so that the first clamp 100 can be ensured to have good conductivity and low cost; the interior of the first jig 100 may include a hollow structure so that the interior of the first jig 100 may constitute a shield cavity. According to the technical scheme of the embodiment of the invention, in the process of testing the shielding effectiveness of the connector to be tested, the connector to be tested is clamped in the first clamp 100. When the first clamp 100 clamps the connector to be tested, the shielding part of the connector to be tested is electrically connected with the first clamp 100; for example, the shield of the connector under test is electrically contacted to the first jig 100 through a spring piece. Because the shielding part of the connector to be tested is electrically connected with the first clamp 100, a first shielding cavity is formed in the first clamp 100 and the shielding part of the connector to be tested, and the terminal part and the body of the connector to be tested are both positioned in the first shielding cavity.
The second fixture 200 may be made of metal, such as copper; the second clamp 200 is made of copper, so that the second clamp 200 can be ensured to have good conductivity and low cost; the inside of the second jig 200 includes a hollow structure so that the inside of the second jig 200 may constitute a second shield cavity.
The reference cable 400 may be a cable conventional in the art, the reference cable 400 including a core and a shielding layer surrounding the core; the shielding of the reference cable 400 may be made of metal, such as copper, and the shielding of the reference cable 400 also serves to shield the spatial electromagnetic field. The test unit 300 has at least the capability of providing an electromagnetic field to the space, detecting and calculating the signal strength, e.g. the test unit 300 may comprise metal wires and analysis equipment, etc.
Based on the above, by using the connector shielding effectiveness testing apparatus according to the embodiment of the present invention, the process of testing the shielding effectiveness of the connector to be tested may include:
the first clamp 100 clamps the connector to be tested, the shielding part of the connector to be tested is electrically contacted with the first clamp 100 through an elastic sheet, and the terminal part and the body of the connector to be tested are both positioned in a first shielding cavity formed by the first clamp 100 and the shielding part of the connector to be tested; the first end of the reference cable 400 is located in the second shielding cavity formed by the second fixture 200, the wire core at the second end of the reference cable 400 is electrically connected with the terminal portion of the connector to be tested (for example, electrically connected with the first terminal portion), and the shielding layer at the second end of the reference cable 400 is electrically connected with the first fixture 100; the test unit 300 can be electrically connected to the shielding layer of the reference cable 400 and the terminal portion of the connector under test (e.g., electrically connected to the second terminal portion), respectively.
To this end, the test unit 300 provides an electromagnetic field at least into the surrounding space of the shielding portion of the connector under test, for example, the test unit 300 may provide an electromagnetic field into both the first jig 100 and the surrounding space of the shielding portion of the connector under test. Finally, the test unit 300 detects the signal intensity of the terminal portion to which the test unit is electrically connected. If the shielding part of the connector to be tested has good shielding effectiveness on the electromagnetic field in the surrounding space, the test unit 300 basically cannot detect the electrical signal at the terminal part, that is, the signal intensity of the detected electrical signal is equal to zero on the basis; if the test unit 300 detects a certain signal strength at the terminal portion, the test unit 300 may evaluate the shielding effectiveness of the shielding portion of the connector to be tested according to the signal strength, so as to test the electromagnetic field shielding effectiveness of the connector to be tested.
In summary, the connector shielding effectiveness testing apparatus provided in the embodiment of the present invention is provided with the first clamp 100 to clamp the connector to be tested, and when clamping the connector to be tested, the first clamp and the shielding portion of the connector to be tested form a first shielding cavity, so that the terminal portion and the body of the connector to be tested are both located in the first shielding cavity; a second shielding cavity is formed by arranging a second clamp 200; by arranging the reference cable 400 and the test unit 300 to provide an electromagnetic field to the surrounding space of the connector to be tested and enabling the test unit 300 to evaluate the shielding effectiveness of the connector to be tested, the testing of the electromagnetic field shielding effectiveness of the connector to be tested is realized. Moreover, the connector shielding effectiveness testing device provided by the embodiment of the invention has the advantages of simple structure, good performance, low cost consumption, easiness in implementation and strong practicability.
In the embodiment of the present invention, the specific structures of the first fixture 100 and the test unit 300 may be various, and the following description is exemplary, but not limiting to the present invention.
Fig. 3 is a schematic structural diagram of a first sub-fixture provided in an embodiment of the present invention, fig. 4 is a schematic structural diagram of a second sub-fixture provided in an embodiment of the present invention, and fig. 5 is a schematic structural diagram when the first sub-fixture and the second sub-fixture are used to clamp a connector to be tested. With reference to fig. 3-5, in one embodiment of the present invention, optionally, the first clamp 100 includes a first sub-clamp 110 and a second sub-clamp 120; the connector under test is clamped between the first sub-clamp 110 and the second sub-clamp 120; the terminal portion and the body of the connector to be tested are both located in the first sub-clamp 110 and the second sub-clamp 120, and the shielding portion of the connector to be tested is located between the first sub-clamp 110 and the second sub-clamp 120 and is electrically connected with the first sub-clamp 110 and the second sub-clamp 120.
Specifically, the first fixture 100 may be composed of two parts, namely a first sub-fixture 110 and a second sub-fixture 120, and the first sub-fixture 110 and the second sub-fixture 120 may be used to clamp the connector to be tested together. In the embodiment of the present invention, the first sub-jig 110 may be used as a simulation of a first electrical device, and the second sub-jig 120 may be used as a simulation of a second electrical device. When the first sub-fixture 110 and the second sub-fixture 120 clamp the connector to be tested together, the first sub-fixture 110 and the second sub-fixture 120 are located on two sides of the connector to be tested respectively, the shielding portion of the connector to be tested is located between the first sub-fixture 110 and the second sub-fixture 120, the shielding portion of the connector to be tested is electrically connected with the first sub-fixture 110 and the second sub-fixture 120, so that a first shielding cavity is formed in the first sub-fixture 110, the shielding portion of the connector to be tested and the second sub-fixture 120, and the terminal portion and the body of the connector to be tested are located in the first shielding cavity.
The first clamp 100 comprises the first sub-clamp 110 and the second sub-clamp 120, so that the first clamp 100 is simple in structure and easy to implement. In addition, fig. 3 and fig. 4 only schematically illustrate one arrangement manner of the first sub-jig 110 and the second sub-jig 120, and the first sub-jig 110 and the second sub-jig 120 may also be other metal structural members capable of clamping the connector to be tested, which is not particularly limited in the embodiment of the present invention. The shape of the first sub-clip 110 and the second sub-clip 120 may be a rectangular parallelepiped shape or other shapes, which is not particularly limited.
With reference to fig. 3 to fig. 5, on the basis of the above technical solution, optionally, the first sub-holder 110 includes a groove 121, and the groove 121 is located on a first sidewall of the first sub-holder 110; the second sub-clip 120 includes an opening 111, the opening 111 is located on and penetrates through a third sidewall of the second sub-clip 120; the first terminal portion and a part of the body of the connector to be tested are located in the groove 121, and the second terminal portion and a part of the body of the connector to be tested are located in the opening 111.
Specifically, the groove 121 on the first side wall of the first sub-jig 110 can be used to accommodate the first terminal portion and a part of the body of the connector to be tested, and the second terminal portion and a part of the body of the connector to be tested can be accommodated in the opening 111 on the third side wall of the second sub-jig 120, so that when the connector to be tested is clamped by the first sub-jig 110 and the second sub-jig 120, the shielding portion of the connector to be tested is located between the first sub-jig 110 and the second sub-jig 120, and both the terminal portion and the body of the connector to be tested are located in the first shielding cavity.
Fig. 6 is another perspective view of the first sub-clip illustrated in fig. 3, fig. 7 is a perspective view of the second sub-clip illustrated in fig. 4, and referring to fig. 6, fig. 7 and fig. 1, based on the above technical solution, optionally, the first sub-clip 110 further includes a first through hole 122; the first through hole 122 is located on a second sidewall of the first sub-clip 110, the first sidewall and the second sidewall being opposite; the core of the second end of the reference cable 400 is electrically connected to the first terminal portion in the first through hole 122; the second sub-jig 120 further includes a second through-hole 112, the second through-hole 112 being located on a fourth sidewall of the second sub-jig 120, the third sidewall being opposite to the fourth sidewall; the connector shielding effectiveness testing apparatus further includes a first joint 140 and a first coaxial cable 150; the first connector 140 is disposed in the second through hole 112, and the second terminal portion is electrically connected to the test unit 300 through the first connector 140; the first connector 140 is electrically connected to the test unit 300 through the core of the first coaxial cable 150, and the shielding layer of the first coaxial cable 150 is electrically connected to the second sub-jig 120 through the first connector 140.
Specifically, when the core at the second end of the reference cable 400 is electrically connected to the first terminal portion within the first through hole 122, the core at the second end of the reference cable 400 may be electrically connected to the first terminal portion by a bolt; also, when the core at the second end of the reference cable 400 is electrically connected to the first terminal portion in the first through hole 122, the shielding layer at the second end of the reference cable 400 may be electrically connected to the first sub-clamp 110.
The first connector 140 is a connector that mates with the first coaxial cable 150, such as a 50 ohm connector. When the second terminal portion of the connector to be tested is electrically connected to the first connector 140, the second terminal portion may be electrically connected to the first connector 140 through a bolt. When the cores of the first coaxial cable 150 are electrically connected to the first connector 140, the shielding layer of the first coaxial cable 150 may be electrically connected to the second sub-clip 120 through the first connector 140. The embodiment of the invention thus realizes the sequential electrical connection of the core of the reference cable 400, the first terminal portion, the second terminal portion, the first connector 140, the core of the first coaxial cable 150 and the test unit 300, and realizes the electrical connection of the shielding layer of the reference cable 400 and the first sub-clamp 110 and the electrical connection of the shielding layer of the first coaxial cable 150 and the second sub-clamp 120.
In one embodiment of the invention, optionally, the test unit comprises an injection line and a signal subunit; the injection line is electrically connected with the signal output end of the signal subunit, and the signal input end of the signal subunit is electrically connected with the terminal part of the connector to be tested; the signal subunit is used for inputting a high-frequency signal to the injection line to generate an electromagnetic field at least in a surrounding space of the shielding part of the connector to be tested through the injection line, and for detecting the signal intensity of the terminal part of the connector to be tested. The specific structure of the signal subunit may be multiple, and the embodiment of the present invention does not specifically limit the specific structure.
Illustratively, the signal subunit comprises a signal source and a radio frequency receiving and measuring instrument, wherein the output end of the signal source is used as the signal output end of the signal subunit, the input end of the radio frequency receiving and measuring instrument is used as the signal input end of the signal subunit, the signal source is used for inputting a high-frequency signal to the injection line, and the radio frequency receiving and measuring instrument is used for detecting the signal intensity of the terminal part of the connector to be measured; the radio frequency receiving and measuring instrument is, for example, a spectrometer or a power meter. Besides, the signal subunit may also be a network analyzer, a signal input end of the network analyzer serves as a signal input end of the signal subunit, and a signal output end of the network analyzer serves as a signal output end of the signal subunit. The technical solution of the embodiment of the present invention is exemplarily described below with a signal subunit as a network analyzer.
In one embodiment of the present invention, optionally, with continued reference to FIG. 1, test unit 300 includes an injection line 320 and a network analyzer 310; the injection line 320 is electrically connected with the signal output end a of the network analyzer 310, and the signal input end b of the network analyzer 310 is electrically connected with the terminal part of the connector to be tested; the network analyzer 310 is for inputting a high-frequency signal to the injection line 320 to generate an electromagnetic field at least in a surrounding space of the shield portion of the connector under test through the injection line 320, and for detecting a signal intensity of the terminal portion of the connector under test.
Specifically, the injection line 320 is, for example, a metal line formed of a copper foil having a flat shape and a line width of, for example, 3 to 5mm. The network analyzer 310 serves as a signal source for supplying a high-frequency signal, for example, a high-frequency signal of about 1GHz to the injection line 320 to generate an electromagnetic field at least in the space around the shield portion of the connector under test through the injection line 320. After the connector to be tested is clamped by the first sub-jig 110 and the second sub-jig 120, the injection line 320 is adhered to the first sub-jig 110, the shielding part and the second sub-jig 120 by the insulating tape 330, the extending direction of the injection line 320 is parallel to the arrangement direction of the first sub-jig 110, the shielding part and the second sub-jig 120, and the injection line 320 is insulated from the first sub-jig 110, the shielding part and the second sub-jig 120, so that the electromagnetic field generated by the injection line 320 is ensured to be distributed in the surrounding space of the shielding part.
The signal input terminal of the network analyzer 310 is electrically connected to the second terminal portion, for example, via the first coaxial cable 150 and the first connector 140 in this order, and the network analyzer 310 detects the signal intensity of the second terminal portion. If the shielding portion of the connector to be tested has good shielding performance against the electromagnetic field in the surrounding space, the network analyzer 310 basically does not detect the electrical signal at the second terminal portion, i.e. the signal strength of the detected electrical signal is equal to zero; if the network analyzer 310 detects a certain signal strength at the second terminal portion, the network analyzer 310 may evaluate the shielding effectiveness of the shielding portion of the connector to be tested according to the signal strength, so as to test the electromagnetic field shielding effectiveness of the connector to be tested.
On the basis of the above technical solution, optionally, with continuing reference to fig. 1, the connector shielding effectiveness testing apparatus further includes a first impedance matching element 130 and a second impedance matching element (not shown in the figure); one end of the injection line 320 is electrically connected to the signal output end of the network analyzer 310, the other end is electrically connected to the first end of the first impedance matching element 130, and the second end of the first impedance matching element 130 is electrically connected to the first clamp 100; a second impedance matching element is connected in series between the core and the shielding at the first end of the reference cable 400.
Specifically, when the injection line 320 extends from the first sub-jig 110 to the second sub-jig 120 through the shielding portion of the connector to be tested, the second end of the first impedance matching element 130 may be electrically connected to the second sub-jig 120. The resistance of the first impedance matching element 130 is, for example, about 50 Ω. The first impedance matching device 130 belongs to the termination and is used to reduce the standing wave on the injection line 320 and avoid the electromagnetic wave reflection, so as to optimize the testing performance of the connector shielding effectiveness testing device. The impedance of the second impedance matching element is equal to the characteristic impedance of the reference cable 400, and is generally about 10 Ω. The second impedance matching element is used for reducing standing waves in a shielding cavity of the connector shielding effectiveness testing device, so that the testing performance of the connector shielding effectiveness testing device is further optimized.
On the basis of the above technical solution, optionally, with continuing reference to fig. 1, the connector shielding effectiveness testing apparatus further includes a second coaxial cable 380; the injection line 320 is electrically connected to the signal output terminal of the network analyzer 310 through the core of the second coaxial cable 380, and the shielding layer of the second coaxial cable 380 is electrically connected to the shielding layer of the reference cable 400, so as to electrically connect the injection line 320 and the signal output terminal of the network analyzer 310.
Here, the injection line 320 may continue from the first sub-holder 110 to the reference cable 400, and at this time, the injection line 320 may be adhered to the insulation sheath of the reference cable 400 by the insulation tape 330. With such a configuration, after the injection line 320 receives the high frequency signal, an electromagnetic field is generated in the reference cable 400, the first sub-fixture 110, the shielding portion of the connector to be tested, and the surrounding space of the second sub-fixture 120, and at this time, after the network analyzer 310 receives the electrical signal at the signal input end, the attenuation multiple of the connector to be tested needs to be evaluated according to the signal strength of the electrical signal and the attenuation multiple of the reference cable 400. The attenuation factor of the reference cable 400 may be stored in the network analyzer 310 after being obtained by a conventional testing device in the art.
On the basis of the above technical solution, optionally, with reference to fig. 1, the connector shielding effectiveness testing apparatus further includes a signal transmission cable 350, a second connector 370 and a magnetic ring 360, where the second connector 370 is a connector matched with the second coaxial cable 380; the injection line 320 is electrically connected with the core of the second coaxial cable 380 sequentially through the core of the signal transmission cable 350 and the second joint 370, the shielding layer of the second coaxial cable 380 is electrically connected with the shielding layer of the signal transmission cable 350 through the second joint 370, and the shielding layer of the signal transmission cable 350 is electrically connected with the shielding layer of the reference cable 400, so as to realize the electrical connection between the shielding layer of the second coaxial cable 380 and the shielding layer of the reference cable 400; the magnetic ring 360 is disposed on the outer wall of the signal transmission cable 350 to prevent the high frequency signal transmitted by the signal transmission cable 350 from being interfered. The number of the magnetic rings 360 may be multiple, for example, three, four, or five, and the like, and the number may be set according to actual needs, which is not particularly limited; and the shielding layer of the signal transmission cable 350 may be electrically connected with the shielding layer of the reference cable 400 through the metal fixture 340.
On the basis of the above technical solution, optionally, referring to fig. 3, a limiting portion 160 is further disposed on the first sub-fixture 110 and/or the second sub-fixture 120; the limiting part 160 is positioned on the first side wall and/or the third side wall; the limiting portion 160 is used for limiting a vertical distance between the first side wall and the third side wall to be less than a preset clamping safety distance when the first sub-clamp 110 and the second sub-clamp 120 clamp the connector to be tested, so as to prevent the connector to be tested from being damaged when the first sub-clamp 110 and the second sub-clamp 120 clamp the connector to be tested. The number of the limiting parts 160 on the first sub-jig 110 and/or the second sub-jig 120 may be multiple, for example, two, four, or six, and the like, and may be set according to actual needs, which is not particularly limited in the embodiment of the present invention. In addition, a plurality of limiting parts 160 can be uniformly distributed on the first side wall and/or the second side wall, so that a limiting effect is better realized. The shape of the stopper 160 may be a column shape or other shapes, which is not particularly limited.
The embodiment of the invention also provides a method for testing the shielding effectiveness of the connector, which can test the shielding effectiveness of the connector to be tested by adopting the device for testing the shielding effectiveness of the connector provided by any embodiment. Fig. 8 is a schematic flowchart of a method for testing shielding effectiveness of a connector according to an embodiment of the present invention, and referring to fig. 8, the method for testing shielding effectiveness of a connector includes:
s10, clamping the connector to be tested in a first clamp; during clamping, the shielding part of the connector to be tested is electrically connected with the first clamp, a first shielding cavity is formed in the shielding part of the connector to be tested and the first clamp, and the terminal part and the body of the connector to be tested are both located in the first shielding cavity.
And S20, generating an electromagnetic field in at least the surrounding space of the shielding part of the connector to be tested through the testing unit.
And S30, detecting the signal strength of the terminal part of the connector to be tested through the test unit so as to test the shielding effectiveness of the connector to be tested on an electromagnetic field.
Optionally, step S30 specifically includes: the signal strength of the terminal part of the connector to be tested is detected through the test unit, so that the shielding effectiveness and/or the surface transfer impedance of the combination body of the connector to be tested and the reference cable to the electromagnetic field are tested.
Optionally, step S30 is followed by step S40 of processing the shielding effectiveness/surface transfer impedance result of the combination of the connector to be tested and the reference cable and the shielding effectiveness/surface transfer impedance result of the reference cable to obtain the shielding effectiveness/surface transfer impedance of the connector.
The connector shielding effectiveness testing method and the connector shielding effectiveness testing device provided by the embodiment of the invention belong to the same invention concept, can realize the same technical effect, and repeated contents are not repeated herein.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A connector shielding effectiveness testing device is characterized by comprising: the test device comprises a first clamp, a second clamp, a reference cable and a test unit;
the first clamp clamps a connector to be tested, a shielding part of the connector to be tested is electrically connected with the first clamp, a first shielding cavity is formed in the shielding part of the connector to be tested and the first clamp, and a terminal part and a body of the connector to be tested are both positioned in the first shielding cavity;
a second shielding cavity is formed in the second clamp, and the first end of the reference cable is located in the second shielding cavity; a wire core at the second end of the reference cable is electrically connected with a terminal part of the connector to be tested, and a shielding layer is electrically connected with the first clamp;
the testing unit is electrically connected with a terminal part of the connector to be tested, and is used for generating an electromagnetic field at least in the surrounding space of the shielding part of the connector to be tested and detecting the signal strength of the terminal part of the connector to be tested so as to test the shielding effectiveness of the connector to be tested on the electromagnetic field;
wherein the first clamp comprises a first sub-clamp and a second sub-clamp; the first sub-clamp comprises a groove, and the groove is positioned on a first side wall of the first sub-clamp;
the second sub-clamp comprises an opening, and the opening is positioned on a third side wall of the second sub-clamp and penetrates through the third side wall;
the terminal part of the connector to be tested comprises a first terminal part and a second terminal part which are opposite; the first terminal part and part of the body of the connector to be tested are positioned in the groove, and the second terminal part and part of the body of the connector to be tested are positioned in the opening;
the first sub-clamp further comprises a first through hole; the first through hole is positioned on a second side wall of the first sub-clamp, and the first side wall is opposite to the second side wall; a core of the second end of the reference cable is electrically connected with the first terminal part in the first through hole;
the connector shielding effectiveness testing device further comprises: a first header and a first coaxial cable;
the second sub-clamp further comprises a second through hole, the second through hole is positioned on a fourth side wall of the second sub-clamp, and the third side wall is opposite to the fourth side wall; the first joint is arranged in the second through hole, and the second terminal part is electrically connected with the test unit through the first joint;
the first connector is electrically connected with the test unit through a wire core of the first coaxial cable, and a shielding layer of the first coaxial cable is electrically connected with the second sub-clamp through the first connector.
2. The connector shielding effectiveness testing apparatus according to claim 1,
the connector to be tested is clamped between the first sub-clamp and the second sub-clamp; the terminal part and the body of the connector to be tested are both positioned in the first sub-clamp and the second sub-clamp, and the shielding part of the connector to be tested is positioned between the first sub-clamp and the second sub-clamp and is electrically connected with the first sub-clamp and the second sub-clamp.
3. The connector shielding effectiveness testing device according to any one of claims 1 to 2, wherein the testing unit includes an injection line and a signal subunit;
the injection line is electrically connected with the signal output end of the signal subunit, and the signal input end of the signal subunit is electrically connected with the terminal part of the connector to be tested; the signal subunit is configured to input a high-frequency signal to the injection line to generate an electromagnetic field at least in a surrounding space of the shielding portion of the connector to be tested through the injection line, and is configured to detect a signal strength of the terminal portion of the connector to be tested.
4. The connector shielding effectiveness testing apparatus according to claim 3, further comprising: a first impedance matching element and a second impedance matching element;
one end of the injection line is electrically connected with the signal output end of the signal subunit, the other end of the injection line is electrically connected with the first end of the first impedance matching element, and the second end of the first impedance matching element is electrically connected with the first clamp;
the second impedance matching element is connected in series between the core and the shielding layer of the first end of the reference cable.
5. The apparatus for testing shielding effectiveness of a connector according to claim 4, further comprising: a second coaxial cable;
the injection line is electrically connected with the signal output end of the signal subunit through the wire core of the second coaxial cable, and the shielding layer of the second coaxial cable is electrically connected with the shielding layer of the reference cable.
6. The apparatus for testing shielding effectiveness of a connector according to claim 5, further comprising: the signal transmission cable, the second joint and the magnetic ring;
the injection line is electrically connected with the wire core of the second coaxial cable sequentially through the wire core of the signal transmission cable and the second joint, the shielding layer of the second coaxial cable is electrically connected with the shielding layer of the signal transmission cable through the second joint, and the shielding layer of the signal transmission cable is electrically connected with the shielding layer of the reference cable;
the magnetic ring is sleeved on the outer wall of the signal transmission cable.
7. The apparatus for testing shielding effectiveness of a connector according to claim 2, wherein the first sub-jig and/or the second sub-jig is further provided with a limiting portion;
the limiting part is positioned on the first side wall and/or the third side wall; the limiting part is used for limiting the vertical distance between the first side wall and the third side wall to be not more than a preset clamping safety distance when the first sub-clamp and the second sub-clamp the connector to be tested.
8. A connector shielding effectiveness testing method using the connector shielding effectiveness testing apparatus according to any one of claims 1 to 7, the method comprising:
clamping a connector to be tested in the first clamp; when the connector is clamped, the shielding part of the connector to be tested is electrically connected with the first clamp, a first shielding cavity is formed in the shielding part of the connector to be tested and the first clamp, and the terminal part and the body of the connector to be tested are both positioned in the first shielding cavity;
generating an electromagnetic field at least in a surrounding space of a shield portion of the connector under test by the test unit;
and detecting the signal intensity of the terminal part of the connector to be tested through the test unit so as to test the shielding effectiveness of the connector to be tested on the electromagnetic field.
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| JP3080896B2 (en) * | 1997-03-06 | 2000-08-28 | 日立電子サービス株式会社 | Shielding effect testing device and inspection device |
| US7969164B2 (en) * | 2008-03-31 | 2011-06-28 | Freescale Semiconductor, Inc. | Method and apparatus for mini module EMI shielding evaluation |
| CN208753687U (en) * | 2018-10-10 | 2019-04-16 | 广州普励检测技术有限公司 | High-voltage shielding line adapter |
| CN211505699U (en) * | 2019-12-11 | 2020-09-15 | 上海电器科学研究院 | Electric automobile connector and shielded cable system's line injection method testing arrangement |
| CN111521897A (en) * | 2020-04-30 | 2020-08-11 | 华南师范大学 | Passive intermodulation interference source positioning system and positioning test method |
| CN214278225U (en) * | 2020-10-14 | 2021-09-24 | 武汉格物芯科技有限公司 | Low-frequency noise test fixture for lead capacitor |
| CN113655293A (en) * | 2021-08-16 | 2021-11-16 | 哈尔滨工业大学 | Coaxial connector electromagnetic shielding effectiveness testing device |
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