Common mode electromagnetic noise and disturbance channel differential mode of switching power supply
In the power switching power supply, it will be converted from power to another power supply load characteristic.
Although the switching power supply noise, through the coupling way to the power grid, the switching power supply itself and other equipment to use more often harassment, common mode and differential mode harassment.
'Harassment' means that the power of the fingerprint harassment, size and direction is relative to the Earth, or the midline.
It is also called ZongMo model harassment torture, asymmetric harassment or grounding harassment. The Earth is containing fluid and harassment.
'Differential mode harassment' refers to the same size, which exists in the opposite direction and power line, according to the boundary between stages.
Differential mode harassment is also called common harassment, mold harassment or symmetrical harassment. Harassment between carrying liquids.
Switching Power Supply, a total of radiation or interpretation of harassment is connected to the circuit of harassment, and then from the differential mode of the power supply circuit of harassment.
Usually, these two kinds of tortures are also due to the imbalance of impedance circuits, and the two kinds of tortures are also very complicated in transmission and transformation.
In the case of high frequency, the switching power supply, the coupling path and The interfered multi-input multi-output power network are decomposed into common modes, to study is a processing method on the complex network of differential mode harassment, which is more suitable under certain circumstances.
However, the common mode and differential mode coupling path into the channel has certain limitations, although the common mode and differential mode components can be measured, but the common mode and differential mode components are composed of components, in fact, it is difficult to decide.
Therefore, some people use the method to describe the function of the system, that is, the function of the switching power supply system studies the coupling path and the coupling relationship of each element of the coupling path, and establishes the channel model.
Many systems, such as sensitivity analysis and modal analysis of analysis results, are used to study the experience and prediction of debugging switching power supply.
However, with the analysis method on the function of the system, and the coupling approach needs to do a lot of work.
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