An electromagnetic interference suppression circuit and its operating method

Abstract

The invention discloses an electromagnetic interference suppression circuit and an operation method thereof. The circuit comprises a direct current bus. The direct current bus is connected with the direct current input end of an inverter through magnetic rings used for suppressing common-mode interference and suppressing differential-mode interference respectively. The alternating current bridge port output of the inverter is connected with the three-phase outlet of the bridge port through an inductor and a circuit breaker QF1. The three-phase outlet of the bridge port is connected with three-phase outlet terminals A, B and C through a common-mode inductor L11, a differential-mode inductor L12 and the magnetic rings, and the magnetic rings and the inductors are used to suppress high-frequency interference in each frequency band. Through the mutual cooperation of the common-mode inductor and the differential-mode inductor, a high-frequency suppression device is added at the source of ahigh-frequency interference source. The common-mode suppression magnetic ring is added to the filter inductor of the inverter, which greatly reduces the electromagnetic interference of the inverter, and effectively improves the anti-jamming capability of the inverter. Interference to an external power grid is reduced, which is conducive to grid-connected operation of a device.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic interference suppression, and in particular relates to an electromagnetic interference suppression circuit and an operation method thereof. Background technique [0002] At present, more and more countries have used EMC standards as the basis for evaluating the performance of switching power adapters, chargers, power transformers, photovoltaic inverters, electric vehicle chargers and battery chargers. More and more countries have begun to enforce electromagnetic compatibility standards, especially in the United States and European countries. Electromagnetic compatibility indicators have become legal indicators and are one of the indicators that manufacturers of power electronic equipment must pass. Equipment designers If the relevant issues are not considered in the initial circuit design, the product will eventually fail the EMC test, fail to obtain relevant certifications, and ultimately...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an electromagnetic interference suppression circuit and its operation method in view of the deficiencies in the above-mentioned prior art, and to improve the single electromagnetic interference suppression method used on the current inverter, the filtering position is unreasonable, and the filter position is unreasonable. There is no problem of mutual cooperation between

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