CDN (Content Delivery Network) with switchable mode suitable for conduction anti-interference and use method of CDN

Abstract

The invention relates to a mode-switchable CDN suitable for conduction anti-interference and a use method thereof, the mode-switchable CDN comprises a CDN main body, the CDN main body is internally provided with a mutual inductor, a first resistor R1 and a second resistor R2, the signal input end of the mutual inductor is electrically connected with a third resistor R3, one end of the third resistor R3 is used for connecting an external signal emitter, and the other end of the third resistor R3 is used for connecting a second signal emitter. The two ends of the signal output end of the mutual inductor are connected with a coaxial line, a change-over switch is arranged on the outer side of the CDN, the first switching position and the second switching position of the change-over switch are electrically connected to the first resistor R1 and the second resistor R2 respectively, and the third switching position of the change-over switch is electrically connected to one end of the mutual inductor. A fourth switching position of the change-over switch is electrically connected to the other end of the mutual inductor; s1, two groups of CDNs are respectively arranged at two sides of an EUT to be detected; a CDN on the right side of the EUT to be detected is connected to the test signal transmitter through a third resistor R3; and after calibration is completed, testing is carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-interference testing, and more particularly to a CDN with switchable modes suitable for conducted anti-interference and a method for using the CDN. Background Art

[0002] Conducted interference testing is to measure the interference transmitted by electronic products or systems from power ports and signal ports to power grids or signal networks through cables. In the prior art, the CDN used to test conducted interference has the following defects: 1. The existing CDN does not have the function of mode switching, and cannot switch between calibration and test modes; 2. The existing CDN needs to install and disassemble multiple components when switching modes; 3. Due to too many auxiliary components, deviations and anomalies may occur during calibration; 4. There is no guarantee for the stability of the entire system. Based on the above defects, the present invention provides a CDN with switchable modes suitable for conducted interference immunity and a method of using the same to solve the above problems. Summary of the invention

[0003] In view of the problems existing in the prior art, an object of the present invention is to provide a CDN with switchable modes suitable for conduction interference immunity, so as to solve the technical problems mentioned in the background technology.

[0004] To solve the above problems, the present invention adopts the following technical solutions: A CDN with a switchable mode suitable for conducted interference rejection comprises a CDN body, wherein a mutual inductor, a first resistor R1, and a second resistor R2 are arranged in the CDN body, a signal input end of the mutual inductor is electrically connected to a third resistor R3, one end of the third resistor R3 is used to connect an external signal transmitter, two ends of the signal output end of the mutual inductor are connected to a coaxial line, a conversion switch is arranged on the outside of the CDN, a first switching position and a second switching position of the conversion switch are electrically connected to the first resistor R1 and the second resistor R2 respectively, the third switching position of the conversion switch is electrically connected to one end of the mutual inductor, and the fourth switching position of the conversion switch is electrically connected to the other end of the mutual inductor.

[0005] Preferably, the resistance value of the first resistor R1 is 150Ω, the second resistor R2 is a conversion resistor of 150Ω to 50Ω, and the resistance value of the third resistor R3 is 50Ω.

[0006] In any of the above solutions, preferably, one side of the signal input end of the transformer is grounded.

[0007] Based on the above method of using a switchable mode CDN suitable for conducted interference immunity: S1: Place the two groups of CDNs on both sides of the EUT to be tested; S2: Connect the CDN on the left side of the EUT to be tested to the first power supply AE1, and connect the CDN on the right side of the EUT to be tested to the second power supply AE2; S3: Connect the CDN on the right side of the EUT to be tested to the test signal transmitter through the third resistor R3; S4: Calibration is performed before testing, that is, the conversion switch is placed in the first switching position and the second switching position for calibration; S5: After calibration is completed, perform testing.

[0008] In any of the above solutions, preferably, the test signal transmitter used in S3 is a radio frequency signal source.

[0009] In any of the above solutions, preferably, the horizontal distance between the EUT to be detected and the CDN is between 0.1m and 0.3m, and the EUT to be detected is 0.1m±0.05m from the ground.

[0010] Preferably, in any of the above solutions, the CDN signal output terminal is greater than or equal to 30 mm from the ground.

[0011] Compared with the prior art, the advantages of the present invention are: 1. An impedance module including a first resistor R1, a second resistor R2, and a third resistor R3 is integrated into the CDN, removing additional components and requiring no additional assembly or disassembly.

[0012] 2. The conversion switch can be used to control the switching of different test modes, and calibration and testing can be performed.

[0013] 3. Since the extra components are removed, there is no need for disassembly and assembly, which greatly reduces the impact on the calibration and test results, and the operation process is simpler and more convenient.

[0014] 4. By reducing the steps of manual operation, the stability of system testing is greatly enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a CDN with switchable modes suitable for conduction interference immunity of the present invention; Figure 2 This is a diagram of the experimental layout. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0017] Example: See also Figure 1 to Figure 2 A CDN with a switchable mode suitable for conducted interference rejection includes a CDN body, in which a mutual inductor, a first resistor R1, and a second resistor R2 are arranged, a signal input end of the mutual inductor is electrically connected to a third resistor R3, one end of the third resistor R3 is used to connect an external signal transmitter, and both ends of the signal output end of the mutual inductor are connected to a coaxial line, a conversion switch is arranged on the outside of the CDN, a first switching position and a second switching position of the conversion switch are electrically connected to the first resistor R1 and the second resistor R2 respectively, the third switching position of the conversion switch is electrically connected to one end of the mutual inductor, and the fourth switching position of the conversion switch is electrically connected to the other end of the mutual inductor.

[0018] In this embodiment, the resistance value of the first resistor R1 is 150Ω, the second resistor R2 is a conversion resistor that converts 150Ω to 50Ω, and the resistance value of the third resistor R3 is 50Ω.

[0019] In this embodiment, one side of the signal input end of the transformer is grounded.

[0020] The working process of the present invention is as follows: S1: Place the two groups of CDNs on both sides of the EUT to be tested, with the CDN signal output terminal greater than or equal to 30 mm from the ground, the horizontal distance between the EUT to be tested and the CDN is between 0.1m and 0.3m, and the EUT to be tested is 0.1m±0.05m from the ground; S2: Connect the CDN on the left side of the EUT to be tested to the first power supply AE1, and connect the CDN on the right side of the EUT to be tested to the second power supply AE2; S3: Connect the CDN on the right side of the EUT to be tested to the test signal transmitter of the RF signal source through the third resistor R3; S4: Calibration is performed before testing, that is, the conversion switch is placed in the first switching position and the second switching position for calibration; S5: After calibration is completed, perform testing.

[0021] Compared with the prior art, the advantages of the present invention are: 1. An impedance module including a first resistor R1, a second resistor R2, and a third resistor R3 is integrated into the CDN, removing additional components and requiring no additional assembly or disassembly.

[0022] 2. The conversion switch can be used to control the switching of different test modes, and calibration and testing can be performed.

[0023] 3. Since the extra components are removed, there is no need for disassembly and assembly, which greatly reduces the impact on the calibration and test results, and the operation process is simpler and more convenient.

[0024] 4. By reducing the steps of manual operation, the stability of system testing is greatly enhanced.

[0025] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A CDN with switchable modes suitable for conducted interference rejection, comprising a CDN body, characterized in that: The CDN body is provided with a mutual inductor, a first resistor R1, and a second resistor R2. The signal input end of the mutual inductor is electrically connected to the third resistor R3. One end of the third resistor R3 is used to connect to an external signal transmitter. Both ends of the signal output end of the mutual inductor are connected to a coaxial line. A rotary switch is provided on the outside of the CDN. The first switching position and the second switching position of the conversion switch are electrically connected to the first resistor R1 and the second resistor R2 respectively. The third switching position of the conversion switch is electrically connected to one end of the mutual inductor, and the fourth switching position of the conversion switch is electrically connected to the other end of the mutual inductor.

2. A CDN with switchable modes suitable for conducted interference immunity according to claim 1, characterized in that: The resistance value of the first resistor R1 is 150Ω, the second resistor R2 is a conversion resistor from 150Ω to 50Ω, and the resistance value of the third resistor R3 is 50Ω.

3. A CDN with switchable modes suitable for conducted interference immunity according to claim 1, characterized in that: One side of the signal input terminal of the mutual inductor is grounded.

4. The method for using a CDN with switchable modes suitable for conduction interference immunity according to claim 1, characterized in that: S1: Place the two groups of CDNs on both sides of the EUT to be tested; S2: Connect the CDN on the left side of the EUT to be tested to the first power supply AE1, and connect the CDN on the right side of the EUT to be tested to the second power supply AE2; S3: Connect the CDN on the right side of the EUT to be tested to the test signal transmitter through the third resistor R3; S4: Calibration is performed before testing, that is, the conversion switch is placed in the first switching position and the second switching position for calibration; S5: After calibration is completed, perform testing.

5. The method for using a CDN with switchable modes suitable for conduction interference immunity according to claim 4, characterized in that: The test signal transmitter used in S3 is a radio frequency signal source.

6. The method for using a switchable mode CDN suitable for conduction interference immunity according to claim 4, characterized in that: The horizontal distance between the EUT to be detected and the CDN is between 0.1m and 0.3m, and the EUT to be detected is 0.1m±0.05m from the ground.

7. The method for using a switchable mode CDN suitable for conduction interference immunity according to claim 4, characterized in that: The CDN signal output terminal is greater than or equal to 30 mm from the ground.

Images