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CN-224231958-U - Transient emission test system checking device

CN224231958UCN 224231958 UCN224231958 UCN 224231958UCN-224231958-U

Abstract

The application relates to the technical field of electromagnetic compatibility testing and discloses a checking device of a transient emission testing system, wherein the transient emission testing system comprises a power module, an electronic switch and a follow current resistor network, the checking device is composed of an inductor and a load resistor which are connected in series, the input end of the electronic switch is connected to the positive output end of the power module, the output end of the electronic switch is connected with the input end of the checking device, the output end of the checking device is connected with the negative output end of the power module, the follow current resistor network is connected between the input end of the electronic switch and the output end of the checking device in a bridging mode, and under the condition that the electronic switch is disconnected, the follow current resistor network, the electronic switch, the inductor and the load resistor form a follow current loop and generate transient pulses for checking the transient emission testing system. The device has the beneficial effects that the technical problem of insufficient stability of the checking device in the related technology is solved, and the stability of the checking device is improved.

Inventors

  • YANG ZHAO

Assignees

  • 浙江零跑科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250522

Claims (10)

  1. 1. The transient emission test system checking device is characterized by comprising a power supply module, an electronic switch and a follow current resistor network, wherein the checking device is composed of an inductor and a load resistor which are connected in series, the input end of the electronic switch is connected to the positive output end of the power supply module, the output end of the electronic switch is connected with the input end of the checking device, the output end of the checking device is connected with the negative output end of the power supply module, the follow current resistor network is connected between the input end of the electronic switch and the output end of the checking device in a bridging mode, and under the condition that the electronic switch is disconnected, the follow current resistor network, the electronic switch, the inductor and the load resistor form a follow current loop and generate transient pulses for checking the transient emission test system.
  2. 2. The apparatus according to claim 1, wherein the power supply voltage of the power supply module is 13.5V, the resistance value of the load resistor is 0.6Ω, and the inductance value of the inductor is 50 μh.
  3. 3. The checking device according to claim 2, wherein the inductance is a ferrite-silica-alumina magnetic core with a rated current of 50A, and the load resistor is a ripple winding resistor with a rated power of 1500W.
  4. 4. The checking device according to claim 2 or 3, wherein the checking device is arranged in a stainless steel shell, a banana socket is arranged on the stainless steel shell, the input end and the output end of the checking device are electrically connected with the banana socket, and the output end of the electronic switch and the negative electrode output end of the power supply module are both banana plugs matched with the banana socket.
  5. 5. The inspection device of claim 4, wherein the banana socket is 6mm in size, is made of pure copper, has a maximum supporting current of 50A, is provided with uniform heat dissipation meshes on the surface of the stainless steel shell, and is made of 304 stainless steel.
  6. 6. The checking device according to claim 1, wherein the freewheel resistor network includes a first branch and a second branch connected in parallel, the first branch is provided with a first resistor, the second branch is provided with a second resistor, the resistance value of the first resistor is 40Ω, and the resistance value of the second resistor is 50Ω.
  7. 7. The checking apparatus according to claim 1, wherein a switching time of the electronic switch is smaller than a time constant of the freewheel loop.
  8. 8. The apparatus of claim 7, wherein the electronic switch has a switching time of 300ns or less, and wherein the electronic switch has a switching time of less than one seventh of a time constant of the freewheel loop.
  9. 9. The apparatus according to claim 1, further comprising an internal inductor and an internal capacitor in the flywheel resistor network, wherein the inductance value of the internal inductor is 5 μh, and the capacitance value of the internal capacitor is 0.1 μf.
  10. 10. The apparatus of claim 1, wherein an input of the apparatus is connected to a first probe of an oscilloscope and an output of the apparatus is connected to a second probe of the oscilloscope to measure peak voltage and rise or fall time of the transient pulse.

Description

Transient emission test system checking device Technical Field The application relates to the technical field of electromagnetic compatibility testing, in particular to a checking device of a transient emission testing system. Background In the field of electromagnetic compatibility testing, the stability and measurement accuracy of a transient emission testing system are important. To ensure its performance, the transient emission test system needs to be spot checked daily and periodically checked monthly. In view of the necessity of periodic verification, the transient emission test system verification device must have high stability and ease of use to meet daily and periodic verification requirements. The checking device in the related art depends on the whole machine product, the internal circuit is complex, and the parameters are easy to drift after long-term use, so that the measurement accuracy is affected. For example, the overall product may include components such as capacitors, switches, and transistors, and performance fluctuations or aging of these components may interfere with the generation and measurement of transient pulses. Disclosure of utility model The application provides a checking device of a transient emission test system, which solves the technical problem of insufficient stability of the checking device in the related art and achieves the technical effect of improving the stability of the checking device. In order to achieve the above purpose, the main technical scheme adopted by the application comprises the following steps: In a first aspect, an embodiment of the present application provides a device for checking a transient emission test system, where the transient emission test system includes a power module, an electronic switch, and a flywheel resistor network, where the checking device is composed of a serially connected inductor and a load resistor, an input end of the electronic switch is connected to an output end of an anode of the power module, an output end of the electronic switch is connected to an input end of the checking device, an output end of the checking device is connected to an output end of a cathode of the power module, the flywheel resistor network is bridged between the input end of the electronic switch and the output end of the checking device, and in a case where the electronic switch is disconnected, the flywheel resistor network forms a flywheel loop with the electronic switch, the inductor, and the load resistor, and generates transient pulses for checking the transient emission test system. According to the device for checking the transient emission test system, provided by the embodiment of the application, under the condition that the electronic switch is disconnected, a follow current loop is formed between the follow current resistor network and the electronic switch, between the follow current resistor network and the inductor and between the follow current resistor network and the load resistor, and transient pulses are generated, and the inductive load characteristics in an actual circuit are simulated by designing the independent inductor and the load resistor, so that the interference of non-core components is avoided, the generation of transient pulses with stable parameters is facilitated, and the reliability of a checking result is ensured. Optionally, the power supply voltage of the power supply module is 13.5V, the resistance value of the load resistor is 0.6Ω, and the inductance value of the inductor is 50 μh. The checking device adopts a series combination of 50 mu H inductance and 0.6Ω load resistance, can accurately simulate the inductive load characteristic in the actual circuit of the actual automobile electronic product, and ensures that the test result can reflect the transient interference characteristic under the actual working condition. The inductor and the load resistor which directly contribute to the transient pulse are refined and made into the standard module, so that the interference of non-core components is avoided, the generation of the transient pulse only depends on the key components with high stability, and the generated transient pulse is more stable, thereby being beneficial to ensuring the checking accuracy. Meanwhile, the checking device provided by the embodiment of the application only needs to calibrate the inductor and the load resistor, so that the maintenance cost is greatly reduced. Optionally, the inductor adopts a ferro-silicon-aluminum magnetic core, rated current is 50A, and the load resistor adopts a ripple winding resistor, and rated power is 1500W. The iron-silicon-aluminum magnetic core has high magnetic conductivity, low loss and good temperature stability, and can effectively reduce inductance heating and ensure the reliability of a circuit system. The structure of ripple wire winding resistance makes it can bear higher power, and the ripple is coiled wire and is compared with ordinary w