EMC auxiliary testing circuit for PoE power supply communication equipment

Abstract

The utility model relates to the technical field of communication equipment testing, and provides an EMC auxiliary testing circuit used for PoE power supply communication equipment, comprising a first testing circuit connected with a first EUT network port, the first testing circuit comprises a first PoE network port module, a first voltage detection module, a first PoE separation module, a first load debugging module and a first monitoring communication module, the first PoE network port module is respectively connected with the first voltage detection module and the first PoE separation module, the first voltage detection module and the first PoE separation module are connected in parallel, the first voltage detection module is grounded, the first PoE separation module is respectively connected with the first load debugging module and the first monitoring communication module, and the first load debugging module is grounded. The first load debugging module and the first monitoring communication module are connected in parallel. According to the utility model, single-path and multi-path EMC tests can be realized, and the EMC testing device can be repeatedly used.

Description

Technical Field

[0001] The utility model relates to the technical field of communication equipment testing, in particular to an EMC auxiliary testing circuit for PoE-powered communication equipment. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model and do not necessarily constitute prior art.

[0003] Chinese Patent with application number CN2022222284388 discloses a network port protection circuit, a power receiving device and a power supply system. The network port protection circuit includes a protection module; the first end of the protection module is electrically connected to the connection line of the non-homonymous ends of the two coils of the first common mode inductor of the network port, the second end of the protection module is electrically connected to the connection line of the non-homonymous ends of the two coils of the second common mode inductor of the network port, and the third end of the protection module is grounded; the protection module is used to cut off and / or suppress the current formed by the power supply device, the first common mode inductor and the second common mode inductor when the network port accesses the power supply device. This network port protection circuit can improve the production test efficiency of PD-PoE devices and non-PD-PoE devices. However, this patent is only applicable to simple production test scenarios and cannot meet the EMC tests during product R & D and debugging. Content of the Utility Model

[0004] In order to solve the technical problems in the above background technique, the utility model provides an EMC auxiliary testing circuit for PoE-powered communication equipment, which can realize single-channel and multi-channel EMC tests and can be reused.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides an EMC auxiliary testing circuit for PoE-powered communication equipment.

[0007] An EMC auxiliary testing circuit for PoE-powered communication equipment includes: a first testing circuit connected to the first EUT network port, and the first testing circuit includes: a first PoE network port module, a first voltage detection module, a first PoE separation module, a first load debugging module and a first monitoring communication module. The first PoE network port module is respectively connected to the first voltage detection module and the first PoE separation module. The first voltage detection module and the first PoE separation module are in parallel, the first voltage detection module is grounded, the first PoE separation module is respectively connected to the first load debugging module and the first monitoring communication module, and the first load debugging module and the first monitoring communication module are in parallel.

[0008] Furthermore, the first PoE network interface module includes an RJ45 network interface and a rectification circuit. The rectification circuit includes a first diode combination, a second diode combination, a third diode combination, and a fourth diode combination. The first diode combination, the second diode combination, the third diode combination, and the fourth diode combination each consist of two diodes with opposite polarities. Among them, the positive electrode of one diode is grounded, and the positive electrode of the other diode is connected to the first PoE separation module; the RJ45 network interface is respectively connected to the first voltage detection module and the first PoE separation module.

[0009] Furthermore, the first voltage detection module uses a YVT7-A chip. The 1st pin of the YVT7-A chip is connected to VCC, the 2nd pin is grounded, and the 3rd and 4th pins are both connected to the RJ45 network interface and the first PoE separation module.

[0010] Furthermore, the first PoE separation module includes four transformers, a bridge circuit, and a sixth diode combination. The sixth diode combination consists of two diodes with opposite polarities. The primary side of the first transformer is respectively connected to the YVT7-A chip, the RJ45 network interface, the rectification circuit, and the bridge circuit. The primary side of the second transformer is respectively connected to the YVT7-A chip, the RJ45 network interface, the rectification circuit, and the bridge circuit. The primary side of the third transformer is respectively connected to the YVT7-A chip and the RJ45 network interface. The primary side of the fourth transformer is respectively connected to the YVT7-A chip, the RJ45 network interface, the rectification circuit, and the bridge circuit.

[0011] Furthermore, the first load debugging module includes a variable resistor, and the variable resistor is connected in parallel with the sixth diode combination.

[0012] Furthermore, the first monitoring and communication module includes an EG828 chip. One end of the secondary side of the first transformer is connected to one end of the first resistor. The other end of the first resistor is respectively connected to the seventh diode combination and the 1st pin of the EG828 chip. The 2nd pin of the EG828 chip is respectively connected to the seventh diode combination and one end of the second resistor. The other end of the second resistor is connected to the other end of the secondary side of the first transformer;

[0013] One end of the secondary side of the second transformer is connected to one end of the third resistor. The other end of the third resistor is respectively connected to the eighth diode combination and the 3rd pin of the EG828 chip. The 4th pin of the EG828 chip is respectively connected to the eighth diode combination and one end of the fourth resistor. The other end of the fourth resistor is connected to the other end of the secondary side of the second transformer;

[0014] One end of the secondary side of the third transformer is connected to one end of the fifth resistor. The other end of the fifth resistor is respectively connected to the ninth diode combination and the 5th pin of the EG828 chip. The 6th pin of the EG828 chip is respectively connected to the ninth diode combination and one end of the sixth resistor. The other end of the sixth resistor is connected to the other end of the secondary side of the third transformer;

[0015] One end of the secondary side of the fourth transformer is connected to one end of the seventh resistor. The other end of the seventh resistor is respectively connected to the twelfth diode combination and the 7th pin of the EG828 chip. The 8th pin of the EG828 chip is respectively connected to the twelfth diode combination and one end of the eighth resistor. The other end of the eighth resistor is connected to the other end of the secondary side of the fourth transformer;

[0016] The seventh diode combination, the eighth diode combination, the ninth diode combination and the twelfth diode combination are all composed of two diodes with opposite polarities.

[0017] Further, the EMC auxiliary measurement circuit for the PoE-powered communication device further includes: a second test circuit connected to the second EUT network port. The second test circuit includes: a second PoE network port module, a second voltage detection module, a second PoE separation module, a second load debugging module and a second monitoring and communication module. The second PoE network port module is respectively connected to the second voltage detection module and the second PoE separation module. The second voltage detection module and the second PoE separation module are in parallel. The second voltage detection module is grounded. The second PoE separation module is respectively connected to the second load debugging module and the second monitoring and communication module. The second load debugging module and the second monitoring and communication module are in parallel.

[0018] Further, the EMC auxiliary measurement circuit for the PoE-powered communication device further includes: a third test circuit connected to the third EUT network port. The third test circuit includes: a third PoE network port module, a third voltage detection module, a third PoE separation module, a third load debugging module and a third monitoring and communication module. The third PoE network port module is respectively connected to the third voltage detection module and the third PoE separation module. The third voltage detection module and the third PoE separation module are in parallel. The third voltage detection module is grounded. The third PoE separation module is respectively connected to the third load debugging module and the third monitoring and communication module. The third load debugging module and the third monitoring and communication module are in parallel.

[0019] Further, the EMC auxiliary test circuit for the PoE-powered communication device further includes: a fourth test circuit connected to the fourth EUT network port, and the fourth test circuit includes: a fourth PoE network port module, a fourth voltage detection module, a fourth PoE separation module, a fourth load debugging module, and a fourth monitoring communication module. The fourth PoE network port module is respectively connected to the fourth voltage detection module and the fourth PoE separation module. The fourth voltage detection module and the fourth PoE separation module are in parallel. The fourth voltage detection module is grounded. The fourth PoE separation module is respectively connected to the fourth load debugging module and the fourth monitoring communication module. The fourth load debugging module and the fourth monitoring communication module are in parallel.

[0020] Further, the structures of the first EUT network port, the second EUT network port, the third EUT network port, and the fourth EUT network port are the same. The structures of the first PoE network port module, the second PoE network port module, the third PoE network port module, and the fourth PoE network port module are the same. The structures of the first voltage detection module, the second voltage detection module, the third voltage detection module, and the fourth voltage detection module are the same. The structures of the first PoE separation module, the second PoE separation module, the third PoE separation module, and the fourth PoE separation module are the same. The structures of the first load debugging module, the second load debugging module, the third load debugging module, and the fourth load debugging module are the same. The structures of the first monitoring communication module, the second monitoring communication module, the third monitoring communication module, and the fourth monitoring communication module are the same.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] The present utility model can achieve single-channel testing, multi-channel testing, and can be reused.

[0023] The present utility model can achieve real-time monitoring of the PoE voltage of the device under test and abnormal alarm.

[0024] The present utility model can achieve dynamic adjustment of the load of the device under test to match the power output requirements of IEEE802.3af / 3at / 3bt.

[0025] The present utility model can achieve network port communication monitoring (interruption time detection) of the device under test and abnormal alarm.

[0026] With the above advantages, the present utility model improves the EMC test analysis efficiency in the R & D test stage of PSE-PoE products. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The attached drawings forming a part of this specification are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0028] Figure 1 It is the circuit diagram of the EMC auxiliary measurement circuit for PoE-powered communication devices shown by the present utility model;

[0029] Figure 2 It is the circuit diagram of the test circuit shown by the present utility model;

[0030] 1. First EUT network port, 2. Second EUT network port, 3. Third EUT network port, 4. Fourth EUT network port, A1. First PoE network port module, B1. Second PoE network port module, C1. Third PoE network port module, E1. Fourth PoE network port module, A2. First voltage detection module, B2. Second voltage detection module, C2. Third voltage detection module, E2. Fourth voltage detection module, A3. First PoE separation module, B3. Second PoE separation module, C3. Third PoE separation module, E3. Fourth PoE separation module, A4. First load debugging module, B4. Second load debugging module, C4. Third load debugging module, E4. Fourth load debugging module, A5. First monitoring communication module, B5. Second monitoring communication module, C5. Third monitoring communication module, E5. Fourth monitoring communication module. Detailed implementation manners

[0031] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0033] Embodiment 1

[0034] As Figure 1 shown, this embodiment provides an EMC auxiliary measurement circuit for PoE-powered communication devices, including: a first test circuit connected to the first EUT network port 1, and the first test circuit includes: a first PoE network port module A1, a first voltage detection module A2, a first PoE separation module A3, a first load debugging module A4, and a first monitoring communication module A5. The first PoE network port module A1 is respectively connected to the first voltage detection module A2 and the first PoE separation module A3. The first voltage detection module A2 and the first PoE separation module A3 are in parallel. The first voltage detection module A2 is grounded. The first PoE separation module A3 is respectively connected to the first load debugging module A4 and the first monitoring communication module A5. The first load debugging module A4 and the first monitoring communication module A5 are in parallel.

[0035] In some embodiments, the EMC auxiliary measurement circuit for the PoE-powered communication device further includes: a second test circuit connected to the second EUT network port 2, and the second test circuit includes: a second PoE network port module B1, a second voltage detection module B2, a second PoE separation module B3, a second load debugging module B4, and a second monitoring and communication module B5. The second PoE network port module B1 is respectively connected to the second voltage detection module B2 and the second PoE separation module B3. The second voltage detection module B2 and the second PoE separation module B3 are in parallel. The second voltage detection module B2 is grounded. The second PoE separation module B3 is respectively connected to the second load debugging module B4 and the second monitoring and communication module B5. The second load debugging module B4 and the second monitoring and communication module B5 are in parallel.

[0036] In some embodiments, the EMC auxiliary measurement circuit for the PoE-powered communication device further includes: a third test circuit connected to the third EUT network port, and the third test circuit includes: a third PoE network port module C1, a third voltage detection module C2, a third PoE separation module C3, a third load debugging module C4, and a third monitoring and communication module C5. The third PoE network port module C1 is respectively connected to the third voltage detection module C2 and the third PoE separation module C3. The third voltage detection module C2 and the third PoE separation module C3 are in parallel. The third voltage detection module C2 is grounded. The third PoE separation module C3 is respectively connected to the third load debugging module C4 and the third monitoring and communication module C5. The third load debugging module C4 and the third monitoring and communication module C5 are in parallel.

[0037] In some embodiments, the EMC auxiliary measurement circuit for the PoE-powered communication device further includes: a fourth test circuit connected to the fourth EUT network port, and the fourth test circuit includes: a fourth PoE network port module E1, a fourth voltage detection module E2, a fourth PoE separation module E3, a fourth load debugging module E4, and a fourth monitoring and communication module E5. The fourth PoE network port module E1 is respectively connected to the fourth voltage detection module E2 and the fourth PoE separation module E3. The fourth voltage detection module E2 and the fourth PoE separation module E3 are in parallel. The fourth voltage detection module E2 is grounded. The fourth PoE separation module E3 is respectively connected to the fourth load debugging module E4 and the fourth monitoring and communication module E5. The fourth load debugging module E4 and the fourth monitoring and communication module E5 are in parallel.

[0038] In some embodiments, the structures of the first EUT network port 1, the second EUT network port 2, the third EUT network port 3, and the fourth EUT network port 4 are the same, and they all refer to the network ports of the EUT (Equipment Under Test) under test.

[0039] In some embodiments, the first PoE network port module A1, the second PoE network port module B1, the third PoE network port module C1, and the fourth PoE network port module E1 have the same structure, and are all PoE network port modules with EMC protection. The network port is attached with a protection circuit to effectively block the EMC interference transmitted by the device under test, preventing the system from being interfered and resulting in communication interruption, acquisition failure, or even system crash.

[0040] In some embodiments, the first voltage detection module A2, the second voltage detection module B2, the third voltage detection module C2, and the fourth voltage detection module E2 have the same structure, and can realize the functions of real-time voltage monitoring and voltage drop alarm. Among them, the voltage range is adjustable from 0 to 100V, and the upper and lower voltage limits and the voltage drop time can be set. Abnormal alarm is realized by detecting the magnitude of the output voltage and the voltage drop time.

[0041] In some embodiments, the first PoE separation module A3, the second PoE separation module B3, the third PoE separation module C3, and the fourth PoE separation module E3 have the same structure. This module complies with the highest protocol standard specified in IEEE802.3bt and is downward compatible with the af.at standard. Through this module, the voltage and signal output from the PoE network port of the device under test can be separated.

[0042] In some embodiments, the first load debugging module A4, the second load debugging module B4, the third load debugging module C4, and the fourth load debugging module E4 have the same structure. This module is realized by a power resistor with adjustable size, and the required load can be adjusted according to the magnitude of the PoE output power of the device under test.

[0043] In some embodiments, the first monitoring and communication module A5, the second monitoring and communication module B5, the third monitoring and communication module C5, and the fourth monitoring and communication module E5 have the same structure. This module is an integrated display screen based on the Linux system, and realizes real-time communication with the device under test and judges the communication status by setting the allowed interruption time through simple IP configuration. Alarm when abnormal.

[0044] It should be noted that an EMC auxiliary test circuit for a PoE power supply communication device provided by the present invention may also include a fifth test circuit, a sixth test circuit, a seventh test circuit, etc., and all have the same structure as the first test circuit, which is specifically determined by the number of network ports of the device under test. When the device under test has only 1 network port, any one of the above paths can be connected; when the device under test has n network ports, the above n paths can be connected in sequence.

[0045] This embodiment takes the first test circuit as an example to elaborate on the circuit structure of the first test circuit, as Figure 2As shown, the first PoE network interface module includes an RJ45 network interface and a rectification circuit. The rectification circuit includes a first diode combination D1, a second diode combination D2, a third diode combination D3, and a fourth diode combination D4. The first diode combination D1, the second diode combination D2, the third diode combination D3, and the fourth diode combination D4 are all composed of two diodes with opposite polarities. Among them, the positive electrode of one diode is grounded, and the positive electrode of the other diode is connected to the first PoE separation module; the RJ45 network interface is respectively connected to the first voltage detection module and the first PoE separation module.

[0046] In some embodiments, the first voltage detection module uses a YVT7-A chip. The 1st pin of the YVT7-A chip is connected to VCC, the 2nd pin is grounded, and the 3rd pin and the 4th pin are both connected to the RJ45 network interface and the first PoE separation module.

[0047] In some embodiments, the first PoE separation module includes four transformers, a bridge circuit D5, and a sixth diode combination D6. The sixth diode combination D6 is composed of two diodes with opposite polarities. The primary side of the first transformer is respectively connected to the YVT7-A chip, the RJ45 network interface, the rectification circuit, and the bridge circuit D5. The primary side of the second transformer is respectively connected to the YVT7-A chip, the RJ45 network interface, the rectification circuit, and the bridge circuit D5. The primary side of the third transformer is respectively connected to the YVT7-A chip and the RJ45 network interface. The primary side of the fourth transformer is respectively connected to the YVT7-A chip, the RJ45 network interface, the rectification circuit, and the bridge circuit D5.

[0048] In some embodiments, the first load debugging module includes a variable resistor, and the variable resistor is connected in parallel with the sixth diode combination D6.

[0049] In some embodiments, the first monitoring and communication module includes an EG828 chip. One end of the secondary side of the first transformer is connected to one end of a first resistor. The other end of the first resistor is respectively connected to a seventh diode combination D7 and the 1st pin of the EG828 chip. The 2nd pin of the EG828 chip is respectively connected to the seventh diode combination D7 and one end of a second resistor. The other end of the second resistor is connected to the other end of the secondary side of the first transformer;

[0050] One end of the secondary side of the second transformer is connected to one end of a third resistor. The other end of the third resistor is respectively connected to an eighth diode combination D8 and the 3rd pin of the EG828 chip. The 4th pin of the EG828 chip is respectively connected to the eighth diode combination D8 and one end of a fourth resistor. The other end of the fourth resistor is connected to the other end of the secondary side of the second transformer;

[0051] One end of the secondary side of the third transformer is connected to one end of the fifth resistor. The other end of the fifth resistor is respectively connected to the 5th pin of the ninth diode combination D9 and the EG828 chip. The 6th pin of the EG828 chip is respectively connected to one end of the ninth diode combination D9 and the sixth resistor. The other end of the sixth resistor is connected to the other end of the secondary side of the third transformer;

[0052] One end of the secondary side of the fourth transformer is connected to one end of the seventh resistor. The other end of the seventh resistor is respectively connected to the 7th pin of the twelfth diode combination D10 and the EG828 chip. The 8th pin of the EG828 chip is respectively connected to one end of the twelfth diode combination D10 and the eighth resistor. The other end of the eighth resistor is connected to the other end of the secondary side of the fourth transformer;

[0053] The seventh diode combination D7, the eighth diode combination D8, the ninth diode combination D9 and the twelfth diode combination D10 are all composed of two diodes with opposite polarities.

[0054] In this embodiment, taking the surge test of a PSE-PoE network port that complies with the IEEE802.3af standard protocol as an example, after setting up the network port surge test environment, the input port of the surge coupling box is connected to the network port of the device under test and the auxiliary test system; the voltage detection module A2 sets its monitored voltage upper limit to 57V, the monitored voltage lower limit to 44V, the monitored voltage drop time to 500ms, and ensures that the alarm is normal; the PoE separation module A3 can automatically separate the voltage and signal output by the PoE network port; the first load debugging module A4 is adjusted to a full-power load of 15W (the maximum PSE output power specified in IEEE802.3af); the first monitoring and communication module A5 performs IP configuration to achieve network port communication, sets the interruption time to 3s, and will automatically alarm when the communication is interrupted for 3s or more; by manually configuring the monitored voltage, the monitored voltage drop time, the load, the IP, and the communication interruption time for the EMC auxiliary test system of the PoE power supply and communication device, observing the alarm information, the abnormalities of the device under test can be intelligently detected, which is convenient for the research, development, debugging, and rectification of the product.

[0055] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An EMC auxiliary measurement circuit for a PoE-powered communication device, characterized in that, Comprising: A first test circuit connected to the first EUT network port, the first test circuit including: a first PoE network port module, a first voltage detection module, a first PoE separation module, a first load debugging module, and a first monitoring and communication module. The first PoE network port module is respectively connected to the first voltage detection module and the first PoE separation module. The first voltage detection module and the first PoE separation module are in parallel. The first voltage detection module is grounded. The first PoE separation module is respectively connected to the first load debugging module and the first monitoring and communication module. The first load debugging module and the first monitoring and communication module are in parallel.

2. The EMC auxiliary measurement circuit for the PoE power supply communication device according to claim 1, wherein The first PoE network port module includes an RJ45 network interface and a rectifier circuit. The rectifier circuit includes a first diode combination, a second diode combination, a third diode combination, and a fourth diode combination. The first diode combination, the second diode combination, the third diode combination, and the fourth diode combination are all two diodes with opposite polarities. Among them, the positive electrode of one diode is grounded, and the positive electrode of the other diode is connected to the first PoE separation module. The RJ45 network interface is respectively connected to the first voltage detection module and the first PoE separation module.

3. The EMC auxiliary measurement circuit for the PoE power supply communication device according to claim 2, wherein The first voltage detection module uses a YVT7-A chip. The 1st pin of the YVT7-A chip is connected to VCC, the 2nd pin is grounded, and the 3rd pin and the 4th pin are both connected to the RJ45 network interface and the first PoE separation module.

4. The EMC auxiliary measurement circuit for PoE-powered communication equipment according to claim 2, wherein The first PoE separation module includes four transformers, a bridge circuit, and a sixth diode combination. The sixth diode combination is two diodes with opposite polarities. The primary side of the first transformer is respectively connected to the YVT7-A chip, the RJ45 network interface, the rectifier circuit, and the bridge circuit. The primary side of the second transformer is respectively connected to the YVT7-A chip, the RJ45 network interface, the rectifier circuit, and the bridge circuit. The primary side of the third transformer is respectively connected to the YVT7-A chip and the RJ45 network interface. The primary side of the fourth transformer is respectively connected to the YVT7-A chip, the RJ45 network interface, the rectifier circuit, and the bridge circuit.

5. The EMC auxiliary measurement circuit for the PoE power supply communication device according to claim 4, wherein The first load debugging module includes a variable resistor, and the variable resistor is in parallel with the sixth diode combination.

6. The EMC auxiliary measurement circuit for PoE-powered communication devices according to claim 4, characterized in that, The first monitoring and communication module includes an EG828 chip. One end of the secondary side of the first transformer is connected to one end of the first resistor. The other end of the first resistor is respectively connected to the seventh diode combination and the 1st pin of the EG828 chip. The 2nd pin of the EG828 chip is respectively connected to the seventh diode combination and one end of the second resistor. The other end of the second resistor is connected to the other end of the secondary side of the first transformer. One end of the secondary side of the second transformer is connected to one end of the third resistor. The other end of the third resistor is respectively connected to the eighth diode combination and the 3rd pin of the EG828 chip. The 4th pin of the EG828 chip is respectively connected to the eighth diode combination and one end of the fourth resistor. The other end of the fourth resistor is connected to the other end of the secondary side of the second transformer. One end of the secondary side of the third transformer is connected to one end of the fifth resistor. The other end of the fifth resistor is respectively connected to the ninth diode combination and the 5th pin of the EG828 chip. The 6th pin of the EG828 chip is respectively connected to the ninth diode combination and one end of the sixth resistor. The other end of the sixth resistor is connected to the other end of the secondary side of the third transformer; One end of the secondary side of the fourth transformer is connected to one end of the seventh resistor. The other end of the seventh resistor is respectively connected to the twelfth diode combination and the 7th pin of the EG828 chip. The 8th pin of the EG828 chip is respectively connected to the twelfth diode combination and one end of the eighth resistor. The other end of the eighth resistor is connected to the other end of the secondary side of the fourth transformer; The seventh diode combination, the eighth diode combination, the ninth diode combination and the twelfth diode combination are all composed of two diodes with opposite polarities.

7. The EMC auxiliary measurement circuit for PoE power supply communication equipment according to claim 1, wherein The EMC auxiliary measurement circuit for the PoE-powered communication device further includes: a second test circuit connected to the second EUT network port. The second test circuit includes: a second PoE network port module, a second voltage detection module, a second PoE separation module, a second load debugging module and a second monitoring and communication module. The second PoE network port module is respectively connected to the second voltage detection module and the second PoE separation module. The second voltage detection module and the second PoE separation module are in parallel. The second voltage detection module is grounded. The second PoE separation module is respectively connected to the second load debugging module and the second monitoring and communication module. The second load debugging module and the second monitoring and communication module are in parallel.

8. The EMC auxiliary measurement circuit for PoE-powered communication equipment according to claim 7, wherein, The EMC auxiliary measurement circuit for the PoE-powered communication device further includes: a third test circuit connected to the third EUT network port. The third test circuit includes: a third PoE network port module, a third voltage detection module, a third PoE separation module, a third load debugging module and a third monitoring and communication module. The third PoE network port module is respectively connected to the third voltage detection module and the third PoE separation module. The third voltage detection module and the third PoE separation module are in parallel. The third voltage detection module is grounded. The third PoE separation module is respectively connected to the third load debugging module and the third monitoring and communication module. The third load debugging module and the third monitoring and communication module are in parallel.

9. The EMC auxiliary measurement circuit for the PoE-powered communication device according to claim 8, characterized in that The EMC auxiliary measurement circuit for the PoE-powered communication device further includes: a fourth test circuit connected to the fourth EUT network port. The fourth test circuit includes: a fourth PoE network port module, a fourth voltage detection module, a fourth PoE separation module, a fourth load debugging module and a fourth monitoring and communication module. The fourth PoE network port module is respectively connected to the fourth voltage detection module and the fourth PoE separation module. The fourth voltage detection module and the fourth PoE separation module are in parallel. The fourth voltage detection module is grounded. The fourth PoE separation module is respectively connected to the fourth load debugging module and the fourth monitoring and communication module. The fourth load debugging module and the fourth monitoring and communication module are in parallel.

10. The EMC auxiliary measurement circuit for PoE-powered communication equipment according to claim 9, characterized in that The structures of the first EUT network port, the second EUT network port, the third EUT network port, and the fourth EUT network port are the same. The structures of the first PoE network port module, the second PoE network port module, the third PoE network port module, and the fourth PoE network port module are the same. The structures of the first voltage detection module, the second voltage detection module, the third voltage detection module, and the fourth voltage detection module are the same. The structures of the first PoE separation module, the second PoE separation module, the third PoE separation module, and the fourth PoE separation module are the same. The structures of the first load debugging module, the second load debugging module, the third load debugging module, and the fourth load debugging module are the same. The structures of the first monitoring and communication module, the second monitoring and communication module, the third monitoring and communication module, and the fourth monitoring and communication module are the same.

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