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The electromagnetic interference (EMI) filter plays an important role in the EMI noise suppression. As the development of the switch mode power supply (SMPS), the power density of the SMPS improves every year. As a result the distance between components becomes smaller and smaller. The near-field magnetic coupling between components becomes larger and larger. However there are fewer studies about...
A novel topology scheme for wireless power transfer (WPT) applications whose transmitter consists of dual opposite phase class E inverters was proposed. Series-series compensation topology was applied for magnetic coupling structure. Constant output voltage at secondary side can be easily realized by inserting a π transconductance at the output of inverter to ensure the primary currents to be constant...
The conducted EMI simulation plays an important part in the SMPS in the product design. The analysis of common mode noise is much more complex than differential mode noise. The CE simulation accuracy depends on the accuracy of CM mode noise. CM noises are determined by the electric coupling between the voltage jump point and the ground. Traditional the CM models of the electric coupling between the...
As the power density of power module increases, the components have to be placed more and more closely and the near field coupling will become more obvious. An integrated coupling inductors scheme had been introduced by utilizing their near field coupling effects among inductors for multi-phase VRM application. Some considerations were taken such as component distance, height, air gap layout and partial...
Coupled inductor scheme with a balancing winding is proposed in multi-phase voltage regulator (VR) application. Mathematic model has established for deep theoretical analysis. With the model, the tradeoff between the performance of efficiency and transient response is clearly revealed with different coupling coefficients. The model and conclusions have been verified by circuit simulation and tests.
The high frequency attenuation performance of an EMI filter is often deteriorated greatly by the stray electromagnetic field existing in interior or exterior of a filter. In this paper, the stray electromagnetic coupling factors in an EMI common mode filter are investigated by different experiments after theory analysis. A novel metal insulated grids method is proposed to separate electric and magnetic...
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