Switching converter EMI conduction modelling and verification

Abstract

Switching converters are widely used. Electromagnetic compatibility (EMC) is an important index in the design process. At present, there are three problems: (i) EMC noise test is usually carried out after the prototype design is completed. This method, which is not tested at the design stage, increases the design cost to some extent; (ii) the complexity and limitations of the test environment lead to low confidence of test results; (iii) traditional modelling methods ignore many factors such as power supply feeders. To solve the above problems, an electromagnetic interference conduction model is proposed in this Letter. After experimental verification, it is found that the test results of this model have a high matching degree with the measurement results of standard EMC equipment.

Reducing Electromagnetic Interference in Three-Level T-type Isolated Bidirectional DC-DC Converter Using a Snubber Circuit

“…Yin et al [10] have presented an EMI conduction modeling for buck converter using SPICE simulation and verified the model with measurement results in the domain. Any noise reduction method is not presented in the study.…”

Electromagnetic interference‐based comparative study between transformerless H5 and optimised H5 grid‐connected photovoltaic inverters

“…The prediction of conducted EMI is based on measurements carried out on an HF model of the PV inverter [24]. Prior to HF model development, it is essential to identify and estimate parasitic parameters of the overall circuit elements [22,23].…”

Study on Emi Analysis and Inhibitory Techniques for Switching Converter Devices

“…The selection of structure and parameters, so the measurement based on the LISN does not help the actual power line filter design and interference suppression. Since LISN measures the mixed noise signals of the common mode (CM) and differential mode (DM) signals, it is impossible to directly detect the specific CM and DM noise signals [2]. Visible electromagnetic interference common mode noise and differential mode noise separation techniques are designed to provide accurate separation of common mode noise signals and differential mode noise signals.…”

“…Due to the distributed capacitance of the inductor coil [1], the self-resonant frequency of the inductor coil is reduced, so that a large amount of high-frequency disturbance signal passes through the inductor coil and propagates outward along the AC power line or the DC output line. At the same time, as the frequency of the interference signal rises [2], the effect of the lead inductance causes the capacitance and filtering effect to decrease continuously, and even the capacitor parameters change, which is also a cause of electromagnetic interference [2].…”