A Prediction Method of Conducted Electromagnetic Interference
A technology of conduction electromagnetic interference and prediction method, which is applied in the direction of design optimization/simulation, special data processing application, etc. It can solve problems such as complex mathematical analysis simulation calculation, difficult interference prediction, simple and fast, quantitative and intuitive, etc., to achieve fast and accurate testing, easy operation strong effect
Active Publication Date: 2021-07-09
HENAN POLYTECHNIC UNIV
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Problems solved by technology
The first type of method for testing interference requires a strict electromagnetic compatibility test environment and professional equipment, and often only gives qualitative results and judgments; the second type of method for establishing circuit models is mainly through the establishment of interference source models or passive components. Parasitic parameter models, and the establishment of these two types of component models also requires complex mathematical analysis and sophisticated network analyzers and other equipment; the third type of numerical analysis method requires complex mathematical analysis and a large number of simulation calculations, which is difficult to meet the actual interference prediction Simple, fast, quantitative and intuitive requirements
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Embodiment 1
[0043] This embodiment is an example of conductive electromagnetic interference prediction in the power supply side of the BUCK converter in the power conversion circuit.
[0044] The BUCK converter is mainly composed of resistance, inductance, and power switching elements, such as figure 1 As shown, the input voltage Vdc = 12V, the switching frequency f = 100 kHz, the inductor L1 = 1 MH, the filter capacitor C = 100 μF, the output resistor R = 10 Ω, the MOSFET element model is IRFP460, the diode model is MR501. Determine the source of interference to the MOSFET element.
[0045] Such as figure 1 Figure 5 The PSPICE simulation model of the actual circuit is established, and the test interference attachment artificial power supply network LISN is added, and the ideal switch and voltage source is used in the simulation model. The voltage source is a segment linear source, and its excitation waveform figure 2 As shown, it is a pseudo-random signal.
[0046] The series combination si...
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The invention discloses a conduction electromagnetic interference prediction method, which obtains input and output data through a simulation model, and uses a least square method to identify a differential mode interference coupling channel model. This model can more accurately describe the characteristics of the differential mode interference coupling channel, and can further realize the quantitative prediction and power spectrum analysis of the differential mode interference on the power supply side in the actual circuit, and provides a feasible method for solving the difficult test of the actual circuit interference. The beneficial effects of the invention are: the method obtains model data through a simulation circuit, and establishes a coupling channel model. In practice, only the interference input signal needs to be tested, and the conduction electromagnetic interference prediction waveform can be realized through conventional equipment such as an oscilloscope. It is highly operable for actual circuit testing, and quantitative data and waveforms of interference output can be obtained. The test is fast, accurate, and simple.
Description
Technical field [0001] The present invention relates to a method of conducting electromagnetic interference prediction, belonging to the field of power electron electromagnetic interference technology. Background technique [0002] The method currently quantitatively predicted in the power conversion circuit is mainly divided into three categories: one is the method of testing, the second is to establish a circuit model method, three is a method of numerical analysis. The first type of test interference requires a strict electromagnetic compatibility test environment and professional equipment, and it is often only given the results and judges; the second type of establishment circuit model is mainly based primarily by establishing an interference source model or passive component. Parasitic parameter model, and the establishment of these two types of component models also requires complex mathematical analysis and precision network analyzer and other equipment; the third type of...
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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 韩素敏黄平华吴晓静王福忠何永盛
Owner HENAN POLYTECHNIC UNIV