KR20100008242A - Electromagnetic filter for testing electromagnetic interference of electric device of vehicle - Google Patents

Abstract

PURPOSE: An electromagnetic filter for testing electromagnetic interference of electric device of vehicle is provided to improve the easiness of the electromagnetic interference test about the various signal of the analog signal. CONSTITUTION: The normal mode inductors (Ln1, Ln2) reduce the normal mode noise. The normal mode capacitors (Cn1, Cn2) reduce the normal-mode noise. The common mode capacitors reduce the common mode noise. The common mode inductor reduces the common-mode noise.

Description

ELECTROMAGNETIC FILTER FOR TESTING ELECTROMAGNETIC INTERFERENCE OF ELECTRIC DEVICE OF VEHICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave filter for testing electromagnetic interference (Electromagnetic interference) in automobiles. More specifically, the electromagnetic interference test for various signals such as analog signals, digital data signals, communication signals, and pulse signals can be easily performed. The present invention relates to an electromagnetic wave filter for electromagnetic interference tests of automotive electronics that can be performed.

In general, electromagnetic interference (Electromagnetic interference) is classified into electromagnetic interference and conductive electromagnetic interference, and electromagnetic interference testing of automotive electronics is essential to measure electromagnetic interference of automotive electronics.

In order to perform the electromagnetic interference test of the automotive electronics, power and various signals necessary for the operation of the automotive electronics have to be provided. Therefore, an electromagnetic filter is used to block electromagnetic waves so that external noise is not transmitted through the power line or the signal line.

On the other hand, in the electromagnetic interference test of automotive electronics, various signals such as analog signals, digital data signals, communication signals, pulse signals, and the like are provided. There was a ham.

Therefore, the technical problem to be achieved by the present invention is to provide an electromagnetic filter for electromagnetic interference test of automotive electronics that can easily perform electromagnetic interference test for various signals such as analog signal, digital data signal, communication signal, pulse signal and the like. .

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In order to achieve the above object, the electromagnetic filter for the electromagnetic interference test for automotive electronics according to an embodiment of the present invention is connected to the first, second through capacitor, the first through capacitor connected between the source terminal and the ground, A first normal mode inductor for reducing normal mode noise, a second normal mode inductor coupled to the second through capacitor, and between the first normal mode inductor and the second normal mode inductor for reducing normal mode noise A first normal mode capacitor disposed between the first normal mode capacitor and the ground to reduce normal mode noise, and a first common mode capacitor disposed to reduce the common mode noise, the second normal mode inductor and the ground. A second common mode capacitor, disposed between the phases to reduce common mode noise, A first common mode inductor connected to a first common mode capacitor and connected to the second common mode capacitor to reduce common mode noise, and a second common mode inductor to reduce common mode noise and the first common And a second normal mode capacitor disposed between a mode inductor and the second common mode inductor and connected between the load terminal and the ground to reduce the normal mode noise.

Here, it is preferable to further include a DC removing capacitor disposed between the first through capacitor and the second through capacitor, to remove the DC component.

Here, connected in parallel with the first normal mode capacitor, for suppressing surge when the counter electromotive force is generated due to the first normal mode inductor, the second normal mode inductor, the first common mode inductor or the second common mode inductor. It is preferable to further include a snubber.

Here, the snubber is preferably configured by a snubber resistor and a snubber capacitor connected in series.

The electromagnetic filter for the electromagnetic interference test of automotive electronics according to embodiments of the present invention can easily perform the electromagnetic interference test for various signals such as analog signals, digital data signals, communication signals, pulse signals.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

1 is a circuit diagram of an electromagnetic wave filter for an electromagnetic interference test of automotive electronics according to an embodiment of the present invention.

The electromagnetic filter for the electromagnetic interference test for automotive electronics according to an embodiment of the present invention includes the first and second through capacitors FT1 and FT2 and the first and second normal mode inductors Ln1 and Ln2 for reducing normal mode noise. ), First and second normal mode capacitors Cn1 and Cn2 for reducing normal mode noise, first and second common mode capacitors Cc1 and Cc2 for reducing common mode noise, and reducing common mode noise. And first and second common mode inductors Lc1 and Lc2 and third and fourth through capacitors FT3 and FT4.

Here, the first and second feedthrough capacitors FT1 and FT2 are connected between the source terminal and the ground, and to improve the high frequency characteristics, and the first normal mode inductor Ln1 is the first. The second normal mode inductor Ln2 is connected to the through capacitor F1 to reduce the normal mode noise, and the second normal mode inductor Ln2 is connected to the second through capacitor F2 to reduce the normal mode noise.

In addition, the first normal mode capacitor Cn1 is disposed between the first normal mode inductor Ln1 and the second normal mode inductor Ln2, and is for reducing normal mode noise, and the first common mode capacitor Cc1. Is disposed between the first normal mode inductor Ln1 and ground, and is for reducing common mode noise.

In addition, the second common mode capacitor Cc2 is disposed between the second normal mode inductor Ln2 and the ground to reduce common mode noise, and the first common mode inductor Lc1 is the first common mode capacitor C1. The second common mode inductor Lc2 is connected to the second common mode inductor Lc2, and the second common mode inductor Lc2 is used to reduce common mode noise.

In addition, the second normal mode capacitor Cn2 is disposed between the first common mode inductor Lc1 and the second common mode inductor Lc2 and is for reducing normal mode noise. (FT3, FT4) is connected between the load (Load) and ground, and to improve the high frequency characteristics.

The electromagnetic filter for the electromagnetic interference test for automotive electronics according to an embodiment of the present invention is a filter for suppressing noise or distortion of an analog signal such as a temperature sensor, and may block noise in the 1 MHz to 100 MHz band.

The above-described band includes capacitances of the first and second normal mode capacitors Cn1 and Cn2, capacitances of the first and second common mode capacitors Cc1 and Cc2, and capacitances of the first and second normal mode inductors Ln1 and Ln2. It is possible to adjust by adjusting the inductance and inductance of the first and second common mode inductors Lc1 and Lc2.

FIG. 2 is a circuit diagram of an electromagnetic filter for an electromagnetic interference test for automotive electronics according to another exemplary embodiment of the present invention, and only a difference from the electromagnetic filter for the electromagnetic interference test for automotive electronics according to an exemplary embodiment of the present invention will be described.

According to another embodiment of the present invention, an electromagnetic wave filter for an electromagnetic interference test for automotive electronics is disposed between a first through capacitor FT1 and a second through capacitor FT2 and includes a DC removing capacitor Cd for removing a DC component. It includes more.

The electromagnetic filter for the electromagnetic interference test of automotive electronics according to another embodiment of the present invention is a filter for suppressing noise of a communication signal or an instantaneous pulse signal used in an automobile and can block noise in a 5 MHz to 100 MHz band. have.

The above-described band includes capacitances of the first and second normal mode capacitors Cn1 and Cn2, capacitances of the first and second common mode capacitors Cc1 and Cc2, and capacitances of the first and second normal mode inductors Ln1 and Ln2. It is possible to adjust by adjusting the inductance and inductance of the first and second common mode inductors Lc1 and Lc2.

FIG. 3 is a circuit diagram of an electromagnetic wave filter for an electromagnetic interference test for an automotive electronic device according to still another embodiment of the present invention, and describes only a difference from the electromagnetic wave filter for an electromagnetic interference test for an automotive electronic device according to another embodiment of the present invention.

The electromagnetic filter for the electromagnetic interference test of automotive electronics according to another embodiment of the present invention is connected in parallel with the first normal mode capacitor Cn1, the first normal mode inductor Ln1, and the second normal mode inductor Ln2. And a snubber 100 for suppressing a surge when a counter electromotive force due to the first common mode inductor Lc1 or the second common mode inductor Lc2 is generated, and specifically, such a snubber 100 ) May include a snubber resistor Rs and a snubber capacitor Cs connected in series.

The electromagnetic filter for the electromagnetic interference test for automotive electronics according to another embodiment of the present invention is a filter for suppressing noise or distortion of a digital data signal used in an automobile, and may block noise in the 1 MHz to 100 MHz band.

The above-described band includes capacitances of the first and second normal mode capacitors Cn1 and Cn2, capacitances of the first and second common mode capacitors Cc1 and Cc2, and capacitances of the first and second normal mode inductors Ln1 and Ln2. It is possible to adjust by adjusting the inductance and inductance of the first and second common mode inductors Lc1 and Lc2.

While the invention has been described and illustrated in connection with a preferred embodiment for illustrating the principles of the invention, the invention is not limited to the configuration and operation as such is shown and described.

Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

1 is a circuit diagram of an electromagnetic wave filter for electromagnetic interference test of automotive electronics according to an embodiment of the present invention.

2 is a circuit diagram of an electromagnetic wave filter for electromagnetic interference test of automotive electronics according to another embodiment of the present invention.

3 is a circuit diagram of an electromagnetic wave filter for electromagnetic interference test of automotive electronics according to another embodiment of the present invention.

Claims (4)

First and second through capacitors connected between the source terminal and ground; A first normal mode inductor connected to the first through capacitor and configured to reduce normal mode noise; A second normal mode inductor connected to the second through capacitor and configured to reduce normal mode noise; A first normal mode capacitor disposed between the first normal mode inductor and the second normal mode inductor, for reducing normal mode noise; A first common mode capacitor disposed between the first normal mode inductor and ground to reduce common mode noise; A second common mode capacitor disposed between the second normal mode inductor and ground to reduce common mode noise; A first common mode inductor coupled to the first common mode capacitor for reducing common mode noise; A second common mode inductor coupled to the second common mode capacitor for reducing common mode noise; A second normal mode capacitor disposed between the first common mode inductor and the second common mode inductor, for reducing normal mode noise; And Electromagnetic filters for electromagnetic interference tests for automotive electronics including third and fourth through capacitors connected between the load and ground. The method of claim 1, The electromagnetic filter of claim 1, further comprising a DC removal capacitor disposed between the first through capacitor and the second through capacitor to remove a DC component. The method according to claim 1 or 2, Connected in parallel with the first normal mode capacitor and suppressing a surge when counter electromotive force is generated due to the first normal mode inductor, the second normal mode inductor, the first common mode inductor or the second common mode inductor Electromagnetic wave filter for electromagnetic interference test for automotive electronics, characterized in that it further comprises a snubber (snubber). The method of claim 3, The snubber is an electromagnetic wave filter for electromagnetic interference test of automotive electronics, characterized in that the snubber resistor and the snubber capacitor is connected in series.

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