KR19980043014U - Conductive Noise Reduction Circuit of Monitor Power Stage - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

monitor

2. The technical problem the invention is trying to solve

This is to solve the problem of malfunctioning because other devices are affected by conductive noise of high frequency band in the monitor power terminal.

3. Summary of solution of design

First and second low pass filters 2 and 3 for removing conductive noise in a low frequency band introduced into the power line, and ground portions of the first and second low pass filters 2 and 3 The first bead core (L1) for removing the conductive noise of the high frequency band introduced into the ground, and the ground portion of the power stage (1) for transmitting the power supplied to the power line to other devices to remove the conductive noise of the high frequency band It is characterized by consisting of the second bead core (L2).

4. Important uses of the devise

This is applied to remove noise of high frequency band from monitor power stage.

Description

Conductive Noise Reduction Circuit of Monitor Power Stage

In general, in the conventional monitor, a power stage noise removing circuit as shown in FIG. 1 is provided to remove noise conducted through a power stage among conductive noises affecting other devices.

The conductive noise removing circuit includes a power supply stage 1 for supplying power to another device, and first and second low pass filters 2 for removing conductive noise when + and − voltages are applied to the power supply stage 1 ( 3).

Referring to the operation of the conductive noise removing circuit of the conventional monitor power supply stage configured as described above are as follows.

First, + and-voltages are applied to the power supply terminal 1 for supplying power to other devices. In this case, the conductive noise is introduced through the + and-lines, respectively, so that the inductor (L) is applied to each power line to remove them. And the first and second low pass filters (2) (3) made of a condenser (C) to remove conductive noise.

However, the conventional conductive noise removing circuit is capable of removing low frequency band conductive noise by a low pass filter provided in a power line, but it is impossible to remove high frequency band conductive noise of 20-30 MHz. There was a problem that other devices malfunction due to conductive noise.

Therefore, the present invention is proposed to solve the general problems caused by the conductive noise of the conventional power source as described above;

An object of the present invention is to provide a conductive noise removing circuit of the monitor power stage to prevent the malfunction of other devices due to the conductive noise by removing the noise conducted through the power stage of the conductive noise affecting the other equipment.

Technical means for achieving this object of the present invention;

First and second low pass filters for removing conductive noise in a low frequency band introduced into a power line;

A first bead core provided in a common ground portion of the first and second low pass filters to remove conductive noise in a high frequency band introduced into a power line;

A second bead core is provided at the ground portion of the power terminal for transmitting the power supplied to the power line to another device to remove the conductive noise of the high frequency band.

Hereinafter, the operation, effects of the present invention will be described in detail.

1 is a conductive noise removing circuit diagram of a conventional monitor power supply stage,

2 is a conductive noise removing circuit diagram of the monitor power supply stage according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: power stage 2, 3: first and second low pass filters

L1, L2: first and second bead cores

2 is a block diagram of a conductive noise removing circuit of the monitor power supply terminal according to the present invention.

As shown, a common contact between the first and second low pass filters (2) and (3) and the first and second low pass filters (2) and (3) to remove conductive noise in the low frequency band flowing into the power line. The first bead core (L1) is provided in the branch to remove the conductive noise of the high frequency band introduced into the power line, and the ground portion of the power supply terminal (1) for delivering the power supplied to the power line to other equipment It consists of a second bead core (L2) to remove the conductive noise of the band.

Referring to the operation of the conductive noise removing circuit of the monitor power terminal according to the present invention configured as described above are as follows.

First, + and-voltages are applied to the power supply stage 1 for supplying power to other devices, wherein the conductive noise of the low frequency band is composed of the inductor L and the capacitor C. The first and second low pass filters 2 It is removed by (3).

Next, the conductive noise of the high frequency band (20 to 30 MHz) flowing into each of the power lines is a first bead core (L1) provided in the common ground of the first and second band filter (2) (3) Attenuated and removed.

In addition, the conductive noise of the high frequency band or the low frequency band introduced into the power supply stage 1 is attenuated and removed from the second bead core L2 provided in the ground portion.

By doing so, it is possible to completely eliminate the conductive noise affecting the other apparatus, thereby preventing the other apparatus from being affected by the conductive noise.

As described in detail above, the present invention has an effect of eliminating the influence of the other devices caused by the conductive noise through the power terminal by removing the conductive noise of the high frequency band through the power terminal among the conductive noise affecting the other device. .

The present invention relates to the removal of the conductive noise of the monitor power stage, and particularly to remove the high frequency noise conducted through the power stage among the conductive noise affecting other devices to prevent the malfunction of other equipment caused by the conductive noise. It relates to a conductive noise canceling circuit of the monitor power supply stage.

Claims (1)

In the monitor power supply short circuit that supplies power to other devices, First and second low pass filters (2) (3) for removing conductive noise in a low frequency band introduced into a power line; A first bead core (L1) provided at a common ground portion of the first and second low pass filters (2) and (3) to remove conductive noise of a high frequency band introduced into a power line; The monitor power stage, characterized in that it comprises a second bead core (L2) is provided in the ground portion of the power stage (1) for transmitting the power supplied to the power line to other devices to remove the conductive noise of the high frequency band Conductive Noise Reduction Circuit.