Pulse waveform verification device for electromagnetic compatibility detection

Abstract

The utility model relates to a pulse waveform verification device for electromagnetic compatibility detection. The pulse waveform verification device comprises a shell main body, and a signal interface, a signal coupling module, a pulse detection module and a display window which are connected in sequence, the signal coupling module comprises a first coil and a second coil which are mutually coupled, and the first coil is connected with the signal interface; in the pulse detection module, the anode of a first electroluminescent element and the anode of a second electroluminescent element are connected with two ends of a second coil, two ends of a first resistor are respectively connected with the cathode of the first electroluminescent element and the anode of a first diode, and two ends of a second resistor are respectively connected with the cathode of a second electroluminescent element and the anode of a second diode. Two ends of the third resistor are respectively connected with the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected with the anode of the first electroluminescent element, and the cathode of the second diode is connected with the anode of the second electroluminescent element. And the detection speed of the pulse waveform signal generated by the pulse generator in the electromagnetic compatibility detection is improved.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic compatibility testing device technology, specifically a pulse waveform verification device for electromagnetic compatibility testing. Background Technology

[0002] The core function of electromagnetic compatibility (EMC) testing is to verify the ability of the system or equipment under test (SUT) to maintain normal operation in an electromagnetic environment and avoid mutual interference. During the test, interference pulses with standard-specified parameters are applied to the SUT via direct injection or coupled network conduction, and its performance degradation is monitored. To ensure that the waveform parameters of the output pulses from the test pulse generator continuously meet the technical requirements of standards such as GB / T 17626.4-2018, a periodic pulse generator metrological traceability mechanism needs to be established. However, the current metrological regulations specify a calibration cycle for pulse generators typically of 1-3 years, leaving a gap in pulse generator status monitoring between adjacent calibration cycles.

[0003] It is worth noting that although Clause 7.2.2 of GB / T 17626.4-2018 explicitly requires functional verification of the pulse signals at the output of the coupling / decoupling network and the capacitive coupling clamp, it does not provide a specific implementation plan. Currently, the industry commonly uses oscilloscopes with high-precision voltage probes and dedicated calibration fixtures for verification operations. This approach has significant drawbacks, including high equipment complexity and long test preparation time, making it difficult to meet the needs of rapid daily testing.

[0004] Therefore, there is an urgent need to design a simple and quick pulse waveform verification device for electromagnetic compatibility testing. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and biases of the prior art and provide a pulse waveform verification device for electromagnetic compatibility testing, so as to reduce the complexity of pulse waveform testing in the prior art and improve the detection speed of pulse waveform signals generated by pulse generators in electromagnetic compatibility testing.

[0006] To achieve the above objectives, a pulse waveform verification device for electromagnetic compatibility testing is designed, comprising: a housing body with an internal cavity; a signal interface disposed on the surface of the housing body; a signal coupling module and a pulse detection module disposed within the cavity; and a display window disposed on the surface of the housing body corresponding to the pulse detection module. The signal interface, signal coupling module, and pulse detection module are sequentially and electrically connected. The output terminals of the signal interface include a high-voltage output terminal and a low-voltage output terminal. The signal coupling module includes mutual coupling coils, which include a first coil and a second coil. The first high-voltage terminal of the first coil is connected to the high-voltage output terminal, and the first low-voltage terminal is connected to the low-voltage output terminal. The second coil includes a second high-voltage terminal and a second low-voltage terminal. The pulse detection module includes: a first electroluminescent element, a second electroluminescent element, a first diode, a second diode, a first resistor, a second resistor, and a third resistor. The positive terminal of the first electroluminescent element is connected to the second high-voltage stage terminal, and the positive terminal of the second electroluminescent element is connected to the second low-voltage stage terminal. The two ends of the first resistor are connected to the negative terminal of the first electroluminescent element and the positive terminal of the first diode, respectively. The two ends of the second resistor are connected to the negative terminal of the second electroluminescent element and the positive terminal of the second diode, respectively. The two ends of the third resistor are connected to the positive terminals of the first and second diodes, respectively. The negative terminal of the first diode is connected to the positive terminal of the first electroluminescent element, and the negative terminal of the second diode is connected to the positive terminal of the second electroluminescent element. The first electroluminescent element, the first resistor, the third resistor, and the second diode together form a positive pulse detection channel, and the second electroluminescent element, the second resistor, the third resistor, and the first diode together form a negative pulse detection channel. The positive and negative pulse detection channels are used to detect the signal under test at the signal interface. The mutual coupling coil is used to adjust the level of the signal under test.

[0007] Preferably, the present invention further includes: the outer shell body is made of metal material and its surface is provided with a conductive coating.

[0008] Preferably, the present invention further includes: the outer surface of the outer shell body is coated with an antistatic coating.

[0009] Preferably, the present invention further includes: the signal interface includes a first socket and a second socket, the high-voltage stage output terminal is disposed in the first socket, and the low-voltage stage output terminal is disposed in the second socket.

[0010] Preferably, the present invention further includes: the mutual coupling coil is integrated and packaged in a PCB board.

[0011] Preferably, the present invention further includes: the display window includes a first observation window and a second observation window, the first observation window and the second observation window being respectively disposed at the electroluminescent elements of the positive polarity pulse detection channel and the negative polarity pulse detection channel.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] This invention effectively solves the problems of complex equipment configuration and excessively long verification time in the functional verification process of existing pulse test systems by constructing an integrated verification module. This technical solution enables rapid status diagnosis of the output waveform parameters of the pulse generator without the need for complex testing equipment, significantly shortening the system health status verification time and ensuring that the test equipment continuously outputs interference pulse waveforms that meet the requirements of GB / T 17626.4-2018 standard within the metrology cycle, thus providing technical assurance for the accuracy and reliability of electromagnetic compatibility test data. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the module connection of this utility model;

[0015] Figure 2 This is a schematic diagram showing the connection of the signal interface, signal coupling module, and pulse detection module of this utility model;

[0016] Figure 3 This is a perspective view of the present utility model;

[0017] In the diagram: 1 Main body of the outer casing; 2 Signal interface; 201 High-voltage stage output terminal; 202 Low-voltage stage output terminal; 203 First jack; 204 Second jack; 3 Signal coupling module; 4 Pulse detection module; 401 First electroluminescent element; 402 Second electroluminescent element; 403 First diode; 404 Second diode; 405 First resistor; 406 Second resistor; 407 Third resistor; 5 Display window; 501 First observation window; 502 Second observation window; 6 First coil; 601 First high-voltage stage terminal; 602 First low-voltage stage terminal; 7 Second coil; 701 Second high-voltage stage terminal; 702 Second low-voltage stage terminal. Detailed Implementation

[0018] To make the purpose, principle and structure of this utility model clearer, the following description is provided in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figure 1-3 As shown, this utility model provides a pulse waveform verification device for electromagnetic compatibility testing, which is used to detect the pulse waveform signal of the pulse signal generator in electromagnetic compatibility testing.

[0020] Example 1:

[0021] For the purposes of this embodiment, the characteristics of the pulse generator are described in the prior art standard document "GB / T17626.4—2018", which states that "the characteristics of the fast transient burst generator are as follows: the output voltage range is at least 0.24kV to 3.8kV with a 1000Ω load; the output voltage range is at least 0.125kV to 2kV with a 50Ω load; polarity: positive, negative; relationship with AC power supply: asynchronous;...".

[0022] This device includes the following structure.

[0023] The outer casing 1 is made of metal and has an internal cavity for integrating various functional modules. The surface of the outer casing 1 is coated with a conductive coating (such as antistatic paint) to shield against external electromagnetic interference and electrostatic discharge.

[0024] Signal interface 2 is located on the surface of the housing body 1 and includes a first socket 203 (which can be marked with red material) and a second socket 204 (which can be marked with black material), which correspond to the high voltage stage output terminal 201 (the high potential terminal of the pulse signal generator output voltage) and the low voltage stage output terminal 202 (the low potential ground terminal), respectively, and are used to connect to the output port of the pulse generator in electromagnetic compatibility testing.

[0025] The signal coupling module 3, housed within the receiving cavity, includes mutual coupling coils, comprising a first coil 6 and a second coil 7. The first high-voltage terminal 601 of the first coil 6 is connected to the high-voltage output terminal 201 of the signal interface 2, and the first low-voltage terminal 602 of the first coil 6 is connected to the low-voltage output terminal 202. The second high-voltage terminal 701 and the second low-voltage terminal 702 of the second coil 7 are respectively connected to the pulse detection module 4 (here, high voltage and low voltage refer to the high-voltage and low-voltage positions in the same circuit where a voltage difference exists). The mutual coupling coils are integrated into the PCB board and are used to attenuate the pulse signal generated by the pulse generator to a safe level (in this embodiment, the pulse generator output voltage is mostly an electrically fast pulse group signal and a surge waveform signal; the energy of the surge waveform signal is greater than that of the electrically fast pulse group, therefore the safe level of the second coil 7 is a 1000V surge pulse voltage; combined with the circuit in the pulse detection module 4 ensuring that the pulse current is less than 100A, the signal can be attenuated to a safe level).

[0026] The pulse detection module 4 includes a positive / negative polarity pulse detection channel, which is used to identify the polarity of the pulse signal to be tested input by the pulse generator at the signal interface 2, based on the positive polarity, negative polarity, and asynchronous relationship with the AC power supply of the pulse generator.

[0027] The specific structure of pulse detection module 4 is as follows: Figure 2 As shown, it includes.

[0028] Positive polarity detection channel: Composed of a first electroluminescent element 401 (such as a red light semiconductor chip), a first diode 403 (with its anode connected to a third resistor 407), a first resistor 405, and a third resistor 407. When a positive polarity pulse is input, the first electroluminescent element 401 emits light.

[0029] Negative polarity detection channel: Composed of a second electroluminescent element 402 (such as a green semiconductor chip), a second diode 404 (with its anode connected to a third resistor 407), a second resistor 406, and a third resistor 407. When a negative polarity pulse is input, the second electroluminescent element 402 emits light.

[0030] The positive terminal of the first electroluminescent element 401 is connected to the second high-voltage stage terminal, and the positive terminal of the second electroluminescent element is connected to the second low-voltage stage terminal. The two ends of the first resistor are connected to the negative terminal of the first electroluminescent element and the positive terminal of the first diode, respectively. The two ends of the second resistor are connected to the negative terminal of the second electroluminescent element and the positive terminal of the second diode, respectively. The two ends of the third resistor are connected to the positive terminals of the first and second diodes, respectively. The negative terminal of the first diode is connected to the positive terminal of the first electroluminescent element, and the negative terminal of the second diode is connected to the positive terminal of the second electroluminescent element. A circuit is formed by the third resistor 407, the first diode 403, and the second diode 404 to filter out high-frequency noise and stabilize the detection level.

[0031] The display window 5 is located on the surface of the outer shell body 1 and includes a first observation window 501 and a second observation window 502, which correspond to the first electroluminescent element 401 and the second electroluminescent element 402 of the positive polarity detection channel and the negative polarity detection channel, respectively, and are used to visually display the input of pulse signals under different polarities.

[0032] The specific workflow of this utility model is as follows.

[0033] The pulse signal to be tested is input from the output port of the pulse signal generator in the electromagnetic compatibility test via signal interface 2, and proceeds through the following process:

[0034] Signal coupling: The first coil of the mutual coupling coil of the signal coupling module 3 receives the signal to be tested input from the signal interface 2, and the second coil attenuates the high voltage pulse signal to the low level input pulse detection module 4 to avoid overloading the detection module.

[0035] Polarity detection: A positive polarity pulse signal is transmitted to the positive polarity detection channel through the second high-voltage terminal 701 of the second coil to form continuous conduction, driving the first electroluminescent element 401 to emit light. At this time, the second electroluminescent element 402 and the first diode 403 are in an open circuit state due to their large reverse resistance. A negative polarity pulse signal is transmitted to the negative polarity detection channel through the second low-voltage terminal 702 of the second coil to form continuous conduction, driving the second electroluminescent element 402 to emit light. At this time, the first electroluminescent element 401 and the second diode 404 are in an open circuit state due to their large reverse resistance.

[0036] Result determination: By observing the illumination status of display window 5, i.e. whether the two electroluminescent elements are flashing, we can directly determine whether the signal generator is outputting a pulse signal normally and the signal polarity. If the electroluminescent elements are flashing, it means there is an output. If the first electroluminescent element 401 is flashing, it means the generator output signal is positive, and if the second electroluminescent element 402 is flashing, it means the output signal is negative.

[0037] It's worth noting that while signal failures in pulse wave generators, such as those producing electrical fast burst signals or surge signals, can manifest in various ways, waveform parameter failures are much less common. Furthermore, most signal problems are due to component aging, which is unlikely to occur in a short period. The vast majority of failures are due to internal faults in the generator, resulting in no signal output.

[0038] The main purpose of this invention is to confirm whether the generator is generating a normal waveform before each test, rather than confirming whether the waveform parameters are normal. Confirming waveform parameters mainly relies on calibration, periodic checks, or weekly verification. (For specific standard requirements, refer to the existing technical document "GB / T17626.4—2018", section "6.2.3 Calibration of Electrical Fast Transient Burst Generator Characteristics", which states that "the following parameters should be measured: rise time of all set voltages, pulse width of all set voltages, pulse repetition frequency of any set voltage within a burst, burst duration of any set voltage, and burst period of any set voltage").

[0039] Example 2:

[0040] Preferably, based on Embodiment 1, the electromagnetic compatibility testing signal generator further includes a signal generator that generates surge signals, ringing wave signals, or damped wave signals. The device of this invention can also be used to detect various types of signals generated by the aforementioned signal generator. Similarly, by determining whether the two electroluminescent elements flicker and the pattern of the flickering, it directly determines whether the signal generator is outputting a signal normally and the signal polarity.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and novel concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A pulse waveform verification device for electromagnetic compatibility testing, characterized in that, include: The outer casing has an internal cavity; the signal interface is located on the surface of the outer casing. The signal coupling module and pulse detection module are installed inside the cavity; The display window is located on the surface of the main body of the casing, at a position corresponding to the pulse detection module; The signal interface, signal coupling module, and pulse detection module are sequentially connected. The output terminals of the signal interface include high-voltage stage output terminals and low-voltage stage output terminals; The signal coupling module includes a mutual coupling coil, which includes a first coil and a second coil. The first high-voltage stage terminal of the first coil is connected to the high-voltage stage output terminal, and the first low-voltage stage terminal is connected to the low-voltage stage output terminal. The second coil includes a second high-voltage stage terminal and a second low-voltage stage terminal. The pulse detection module includes: a first electroluminescent element, a second electroluminescent element, a first diode, a second diode, a first resistor, a second resistor, and a third resistor; The positive terminal of the first electroluminescent element is connected to the second high-voltage stage terminal, and the positive terminal of the second electroluminescent element is connected to the second low-voltage stage terminal. The two ends of the first resistor are respectively connected to the negative terminal of the first electroluminescent element and the positive terminal of the first diode. The two ends of the second resistor are respectively connected to the negative terminal of the second electroluminescent element and the positive terminal of the second diode. The two ends of the third resistor are respectively connected to the positive terminals of the first diode and the second diode. The negative terminal of the first diode is connected to the positive terminal of the first electroluminescent element, and the negative terminal of the second diode is connected to the positive terminal of the second electroluminescent element. The first electroluminescent element, the first resistor, the third resistor, and the second diode together form a positive polarity pulse detection channel, and the second electroluminescent element, the second resistor, the third resistor, and the first diode together form a negative polarity pulse detection channel. The positive polarity pulse detection channel and the negative polarity pulse detection channel are used to detect the signal to be tested at the signal interface; The mutual coupling coil is used to adjust the level of the signal under test.

2. A pulse waveform verification device for electromagnetic compatibility testing as recited in claim 1, wherein, The outer shell is made of metal and has a conductive coating on its surface.

3. A pulse waveform verification device for electromagnetic compatibility testing as described in claim 1 or 2, characterized in that, The outer surface of the main body of the outer shell is coated with an antistatic coating.

4. The pulse waveform verification device for electromagnetic compatibility testing as described in claim 1, characterized in that, The signal interface includes a first socket and a second socket, with the high-voltage output terminal located in the first socket and the low-voltage output terminal located in the second socket.

5. The pulse waveform verification device for electromagnetic compatibility testing as described in claim 1, characterized in that, The mutual coupling coils are integrated and packaged in the PCB board.

6. A pulse waveform verification device for electromagnetic compatibility testing as recited in claim 1, wherein, The display window includes a first observation window and a second observation window, which are respectively located at the electroluminescent elements of the positive polarity pulse detection channel and the negative polarity pulse detection channel.

Images