Electromagnetic interference prediction method and system for circuit
A technology of electromagnetic interference and prediction method, applied in electrical digital data processing, instruments, design optimization/simulation, etc., can solve problems such as high hardware platform requirements, electromagnetic environment of expensive measuring instruments, etc., and achieve the effect of low hardware requirements
Pending Publication Date: 2018-11-30
SHENZHEN UNIV
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Problems solved by technology
[0002] The traditional electromagnetic interference suppression method is usually to make a basic prediction of electromagnetic interference, and then design the electromagnetic interference filter. Although this method is simple and convenient, it needs repeated attempts to meet the electromagnetic compatibility standard
Another common practice is to design the EMI filter based on actual measurement results and EMC standards. This method requires expensive measuring instruments and a strict electromagnetic environment, and has high requirements for the hardware platform.
Method used
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Embodiment 1
[0103] Embodiment 1, the electromagnetic interference of the three-phase grid-connected inverter is predicted by the above-mentioned circuit electromagnetic interference prediction method:
[0104] refer to Figure 9 , is a schematic diagram of the structure of a three-phase grid-connected inverter, through Figure 9 Obtain its EMI equivalent circuit, such as Figure 10As shown, the equivalent circuit is a circuit model, and the circuit model includes a common-mode and differential-mode interference source, an electromagnetic interference conduction path, and a line impedance stabilization network (LISN) equivalent resistance of 50Ω;
[0105] According to the circuit model, it is determined that the common-mode interference source V1 is the voltage of the switching tube to ground, and the differential-mode interference source V2 is the voltage between the phase lines of the circuit.
[0106] Determine the equivalent resistance ( Figure 11-12 ).
[0107] pass Figure 10 T...
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The invention discloses an electromagnetic interference prediction method and system for a circuit. The electromagnetic interference prediction method comprises the following steps: separately establishing an initial common mode interference model and an initial differential mode interference model according to an electromagnetic interference distribution path of a circuit model; respectively substituting a J-A model into the initial common mode interference model and the differential mode interference model, modeling inductance in the interference models so as to obtain an optimized common mode interference model and an optimized differential mode interference model; substituting optimized values of Ms, c, k, alpha and a sign as shown in specification into the common mode interference model and the differential mode interference model to obtain prediction data to electromagnetic interference conditions of a circuit model. By the electromagnetic interference prediction method and system for the circuit, requirements for hardware are low, the method is convenient to operate, and prediction results are close to actual electromagnetic interference conditions.
Description
technical field [0001] The invention relates to the field of electromagnetic interference prediction, in particular to a circuit electromagnetic interference prediction method and system. Background technique [0002] The traditional electromagnetic interference suppression method is usually to make a basic prediction of electromagnetic interference, and then design the electromagnetic interference filter. Although this method is simple and convenient, it needs repeated attempts to meet the electromagnetic compatibility standard. Another common practice is to design an EMI filter based on actual measurement results and EMC standards. This method requires expensive measuring instruments and a strict electromagnetic environment, and has high requirements for hardware platforms. [0003] Therefore, there is a need for a method for predicting the electromagnetic interference of a circuit with low hardware requirements and more accurate from the perspective of engineering applica...
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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 刘艺涛江师齐王怀智王贵斌彭建春
Owner SHENZHEN UNIV