Common Mode Noise Filter

Abstract

The invention relates to a common mode noise filter. The common mode noise filter is characterized by comprising a first lead body, one end of the first lead body being connected with an external first wire for current flow; a second lead body, one end of the second lead body being connected with an external second wire for current flow; a cylindrical capacitor which intervenes in the other end of each of the first lead body and the second lead body to connect the first lead body with the second lead body, and which is in ground connection with a bottom disc to be equipped with a central hole; and a third lead body, wherein the central portion of the third lead body is inserted and arranged in the central hole of the cylindrical capacitor, the left side portion of the third lead body penetrates the center of the first lead body from one end of the central portion and extends in a direction of the first wire, and the right side portion of the third lead body penetrates the center of the second lead body from the other end of the central portion and extends in a direction of the second wire. In this way, a structure for separating high frequency currents from low frequency currents and filtering through utilization of Skin Effect enables common mode high frequency currents to be reduced.

Description

technical field [0001] The present invention relates to a common-mode noise filter, in particular to a common-mode noise filter for removing high-frequency common-mode noise. Background technique [0002] Like electric vehicles, when using high voltage as a power supply, there is a high-voltage bus between the DC-LINK capacitors connected to the front end of the switch, etc. These high-voltage buses are isolated by the electrical chassis (Electrical Chassis), and the human body is in contact with it. It can prevent electric shock when reaching the chassis. [0003] If a high-voltage bus like this is not grounded to the electrical chassis, there will be noise power and stray capacitance (Stray Capacitance) in the voltage supply line. This situation will form a common mode current (Common mode current) in the same direction from the noise power supply to the high voltage bus, and the current leaked through the stray capacitance flows in the electrical chassis, which is transm...

AI Technical Summary

Problems solved by technology

[0007] However, the method of using Y capacitors in the conventional method is to divide the common mode current into two current lines, the high voltage bus and the Y capacitor, at the branch point of the high voltage bus connected to the Y capacitor, so the common mode current is removed only at the Y capacitor. current will be limited

[0008] In addition, the conventional method of using a common mode noise filter has the disadvantage that the weight and size of the common mode noise filter using an inductor increase accordingly when the power capacitance is large, as in electric vehicles.

Moreover, the use of cables and shielding sleeves requires a high degree of technology, which will lead to the problem of increased design and manufacturing costs.

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