Common-mode current restraining device for electric automobile

Abstract

The invention relates to a common mode current restraining device used in the electric automobile, belonging to the technical field of the electric automobiles, composed of two high-frequency cores TR1, TR2 and auxiliary coils N1 and N2 sleeved on two power cables at the same time; a control circuit is composed of three operational amplifiers in the cascade connection and a power drivers, wherein the winding direction of N1 is the same to that of the cable passing through the magnetic core TR1; the winding direction of N2 is opposite to that of the cable passing through the magnetic core TR2; the identical terminal of N1 is connected with the ground of the control circuit, and the other end is connected with the common mode input terminal; the inverted input terminal of A1 is connected with the output terminao, and the output signal of A4 is connected with the output terminal; the identical terminal of N2 is connected with the output terminal of the power drivers A4, and the other end is connected with the ground of the control circuit. The device has better inhibition on the common mode current.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a common-mode current suppression device for electric vehicles. Background technique [0002] Electric vehicles have the advantages of energy saving and environmental protection, and their research and development have received extensive attention. However, the vehicle-mounted high-power power converter generates broadband electromagnetic noise and electromagnetic interference (EMI) during the working process, which mainly propagates along the cable and chassis in the form of common-mode current, affecting the normal operation of the electrical equipment and control system on the vehicle. , resulting in serious electromagnetic compatibility problems, which is not conducive to the reliable operation of electric vehicles and its industrialization process. During the "Eleventh Five-Year Plan" period, the electromagnetic compatibility of electric vehicles, as a...

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Problems solved by technology

However, in the environment of electric vehicles, the wire diameter of the power cable is relatively large, up to 1cm or more. For the magnetic cores on the market, the inner diameter is generally less than 4cm. The cable can only pass through the magnetic core directly, which is equivalent to the number of turns of a coil, and the equivalent inductance obtained is only about 1uH, and the suppression effect is poor

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