A Quantitative Control Method of Power Line Conducted Emission Based on Impedance Pull

Abstract

The invention relates to a power cord conducted emission quantification control method based on impedance traction. The method comprises the following steps: firstly conducting qualitative analysis on a power cord interference signal emission test, determining the impedance of an interference source as the main controllable influence factor, further establishing an impedance traction circuit model of the power cord conducted emission to obtain a quantitative relation of an interference signal and the internal resistance of a tested device, then based on the impedance traction circuit model, conducting quantification computing on the magnitude-frequency characteristics of the power cord conducted emission, and conducting quantification evaluation on the size of the interference signal after the regulation of the impedance traction, thus proving the effectiveness and feasibility of the suppression of the interference signal by the impedance traction.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic compatibility testing, and relates to a quantitative control method for conduction emission of a power line based on impedance pull. Background technique [0002] The interference signal generated by the switching power supply inside the electronic equipment will be output through the power cable. On the one hand, the interference signal will be coupled to the power supply system through the power line, which will damage the performance of the power supply system. On the other hand, the interference signal will generate radiation while propagating on the power line. launch, resulting in new electromagnetic compatibility problems. Therefore, the power line interference signal emission test is an essential part of the electromagnetic compatibility test, and it is also of great significance to control the electromagnetic interference emission on the power line. [0003] At present, the condu...

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Problems solved by technology

The traditional test method mainly relies on the lumped parameter circuit theory, but when the length of the power line can be compared with the signal wavelength, the lumped parameter circuit can no longer accurately analyze the interference emission of the power line, and the distributed parameter effect of the wire needs to be considered

In addition, the suppression of the conducted emission of the power line is mainly achieved by connecting a filter in series at the power input end of the equipment under test. Without analyzing the interference emission of the power line from the impedance characteristics of the equipment under test, it is impossible to quantitatively evaluate its electromagnetic interference emission. characteristics, so the proposed interference suppression method is inflexible and incomplete

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