System for suppressing conducted EMI of switching tube and household appliance

Abstract

The embodiment of the invention discloses a system for suppressing conducted EMI of a switching tube and a household appliance. The system comprises a conduction EMI suppression circuit, an inductiveload and at least one switching tube; the conduction EMI suppression circuit comprises an inductor and an RC circuit; the inductor is connected with each switching tube in series, the inductive load is connected with each switching tube, the inductor and each switching tube are connected with the RC circuit in parallel after being connected in series, and the conductive EMI suppression circuit isused for suppressing conductive EMI caused by each switching tube when the switching tube is turned off. According to the system for suppressing the conducted EMI of the switching tube and the household electrical appliance provided by the embodiment of the invention, voltage division is performed on the LISN during the conducted EMI test, and a filter plate is not required to be used, so that thecost of passing the conducted EMI test is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of household appliances, and in particular to a system for suppressing conduction EMI for a switching tube and a household appliance. Background technique [0002] Electromagnetic Interference (EMI for short) refers to the damage caused by unwanted signals or noise to the reception or transmission of useful electromagnetic signals. EMI generated by electronic / electrical equipment is transmitted through wires or public power lines, and EMI transmitted in wires or public power lines can be called conducted EMI. The conducted EMI of electronic / electrical equipment can be measured through the Line Impedance Stabilization Network (LISN for short). At present, electronic / electrical equipment needs to pass relevant conducted EMI tests before being put on the market. [0003] For electronic / electrical equipment using switching tubes such as bidirectional thyristors, metal oxide semiconductor f...

AI Technical Summary

Problems solved by technology

In practical applications, when the frequency of conducted EMI is low, the capacitive impedance of the RC snubber circuit is high, resulting in low insertion loss of the RC snubber circuit. The lower impedance of the load leads to low insertion loss of the RC snubber circuit. It is also necessary to add a filter board at the power port to pass the conducted EMI test, which increases the cost of the conducted EMI test.

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