KR20150144265A - Elctromagnetic wave protector - Google Patents

Abstract

The present invention relates to an electromagnetic wave protector with an improved structure which has a practical electromagnetic wave shielding effect and prevents an adjacent socket from being blocked when the electromagnetic wave protector is inserted into the socket. The electromagnetic wave protector according to the present invention includes a plug part which receives AC power, a socket part which supplies the AC power to an external device, a filter part which shields an AC electromagnetic wave from the AC power supplied by the plug part or reduces the AC electromagnetic wave, and supplies the AC electromagnetic wave to the socket part, and a case part which accommodates the filter part and is combined with the socket part and the plug part. The plug part is rotatably combined with the case part.

Description

{Elctromagnetic wave protector}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding apparatus, and more particularly, to an apparatus for shielding electromagnetic waves such as a conductive electromagnetic wave, an electrical fast transient (EFT), and a surge generated in an AC power supply apparatus .

Generally, various electric / electronic devices such as an elevator, a computer, a TV, and a microwave oven are driven by an AC power source. At this time, conductive electromagnetic waves, EFT, etc. are generated and flow into the inside of the electric / electronic device, causing a malfunction of the chip mounted inside the device. In addition, surges arising from lightning or abnormal voltage inflows cause malfunctions, breakdowns, and fires in electrical / electronic equipment. In fact, electrical and telecommunication devices are rapidly increasing in disruption. Electromagnetic waves harmful to the human body are inevitably generated by such conductive electromagnetic waves, EFTs, and surges (hereinafter referred to as "AC electromagnetic waves").

Therefore, in order to reduce electromagnetic waves harmful to electric / electronic devices and human body, a lot of investment and research are being carried out by national institutions and various research institutes, and a large number of prior patents have been filed in this regard. However, most of the research to date has been focused on technologies to cut out electromagnetic waves radiated from the individual electric / electronic devices themselves or to reduce the electromagnetic waves conducted by the equipment to the power lines, There is little research on the technology that can block AC electromagnetic waves at the receptacle.

Further, the electromagnetic wave shielding device is necessarily provided with a filter portion (filtering circuit board) for shielding or reducing the AC electromagnetic wave from the AC power source. In order to obtain a substantial electromagnetic wave shielding effect, , The size or number of the parts constituting the filter unit must be at least a certain level). Therefore, the electromagnetic wave shielding apparatus has a size larger than a certain level. When the electromagnetic wave shielding apparatus is plugged into the outlet (or the multi-outlet), the electromagnetic wave shielding apparatus blocks the adjacent outlet so that the adjacent outlet can not be used.

Patent Registration No. 10-0274928 (auxiliary device for removing electromagnetic waves)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide an electromagnetic wave shielding device improved in structure to solve the problem of blocking an adjacent receptacle while having a substantial electromagnetic wave shielding effect.

An electromagnetic wave shielding apparatus according to the present invention comprises a plug portion to which an AC power is supplied, a receptacle portion to supply the AC power to an external device, and a shielding portion to shield or reduce AC electromagnetic waves from the AC power supplied through the plug portion, And a case portion accommodating the filter portion therein and coupled to the receptacle portion and the plug portion, wherein the plug portion is rotatably coupled to the case portion.

According to the present invention, it is preferable that the case portion includes a lower case having a circular through hole formed therethrough, and a rotary member rotatably inserted into the through hole, and the plug portion is coupled to the rotary member.

According to the present invention, the lower case is provided with concave and convex portions formed along the circumferential direction of the through-hole, and the rotary member is provided with protrusions inserted into the concave-convex portion.

In addition, according to the present invention, the filter unit may include an overcurrent blocking unit configured to be a fuse connected in series to the first power input terminal to cut off the power supply when the overcurrent flows; A first varistor connected between the first power input terminal and the second power input terminal, a second varistor connected between the first power input terminal and the input ground terminal, and a second varistor connected between the second power input terminal and the input ground terminal A surge blocking unit configured by a third varistor for blocking a surge flowing from the AC power source; A first capacitor connected between the first power input terminal and the input ground terminal; a second capacitor and a third capacitor connected in series between the first power input terminal and the input ground terminal; A first capacitor connected between a power input terminal and a common contact of the second capacitor and a common contact of the second power input terminal and the third capacitor and having two output terminals connected to a first power output terminal and a second power output terminal, A conductive electromagnetic wave and an EFT blocking unit comprising an inductor and a fourth capacitor connected to the first power output terminal and the second power output terminal to reduce conductive electromagnetic waves and EFT from the AC power supply; A discharger connected to the first power input terminal and the input ground terminal for discharging a current charged in the first capacitor to the third capacitor; And a second inductor connected between the input ground terminal and the output ground terminal to reduce electromagnetic waves flowing into the security ground of the AC power source.

According to the present invention, it is possible to prevent the adjacent receptacle from being blocked when the electromagnetic shielding device is inserted into the receptacle, while having a substantial electromagnetic shielding effect.

1 is a perspective view of an electromagnetic wave shielding apparatus according to an embodiment of the present invention.
2 is a schematic exploded perspective view of the electromagnetic wave shielding apparatus shown in FIG.
3 is a schematic side view of the electromagnetic interrupter.
4 is a view for explaining that the receptacle section is rotated;
5 is a diagram showing a configuration of an electromagnetic wave cut-off filter circuit mounted on the electromagnetic cut-off device according to the present invention.
6 is a perspective view showing a state in which the electromagnetic wave shielding device is coupled to the multi-outlet.
7 is a perspective view showing a state in which a plurality of electromagnetic interrupters are interconnected.
8 is an exploded perspective view of an electromagnetic wave shielding apparatus according to another embodiment of the present invention.

Hereinafter, an electromagnetic wave shielding apparatus according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a schematic exploded perspective view of the electromagnetic wave shielding apparatus shown in FIG. 1, FIG. 3 is a schematic side view of the electromagnetic wave shielding apparatus, and FIG. 4 Fig. 5 is a diagram showing the configuration of the electromagnetic wave shielding filter circuit mounted on the electromagnetic wave shielding apparatus according to the present invention, and Fig. 6 is a view showing a state in which the electromagnetic wave shielding apparatus is connected to the multi- And FIG. 7 is a perspective view of a state in which a plurality of electromagnetic shielding devices are interconnected.

1 to 7, an electromagnetic wave shielding apparatus 100 according to the present embodiment includes a casing 50, a plug 140, a receptacle 130, and a filter 120 .

The case portion 50 includes a lower case 10, a rotating member 20, and an upper case 30.

The lower case (10) has a flat plate portion (11) and a side portion (12). The flat plate portion 11 is formed in an "8" shape in which two circular plates are connected to each other. One circular plate of the two circular plates constituting the flat plate portion 11 is formed with a through hole 111 formed in a circular shape. As shown in FIG. 2, a concavo-convex portion 112 is formed around the through-hole in a sawtooth shape along the circumferential direction of the through-hole. The side surface portion 12 extends upward from the edge of the flat plate portion 11.

The rotary member (20) has a cylindrical portion (21) and a lower plate (22). The cylindrical portion 21 is formed in a cylindrical shape corresponding to the through-hole 111 of the lower case. At the upper end of the cylindrical portion 21, a flange portion 211 extending in the outward direction is provided. The flange portion 211 is formed with a protruding portion 212 that protrudes in the outward direction. The protruding portion 212 is inserted into the recessed portion 112 of the lower case. The lower plate 22 is coupled so as to cover the lower end of the cylindrical portion 21. A pair of holes are formed in the bottom plate 22.

The rotating member 20 thus configured is inserted into the through hole 111 of the lower case. At this time, the flange portion 211 of the rotating member is caught by the flat plate portion (more precisely, the through hole) (10). When the rotary member 20 is inserted into the through hole 111, the protruding portion 212 of the rotary member is inserted into the concave and convex portion 112. When the rotary member 20 is rotated in this state, The rotating member 20 is rotated as shown in FIG. 4 by repeating the process of separating from the part 112 and re-inserting it into the adjacent concave-convex part.

The upper case 30 has a plug insertion portion 31 and a filter accommodating portion 32. The plug insertion portion 31 and the filter accommodating portion 32 are connected to each other, Quot; 8 "shape corresponding to the lower case, and the upper case 30 is detachably coupled to the side portion 12 of the lower case. The plug insertion portion 31 of the upper case is positioned on the upper side of the rotary member 20 and the plug insertion portion 31 is provided with a groove portion 311 and a pair of An insertion hole 312 is formed. The upper end of the filter accommodating portion 32 is closed and the lower end of the filter accommodating portion 32 is formed into an open cylindrical shape. A filter unit 120 to be described later is disposed inside the filter accommodating unit. Further, a display hole 321 is formed in the filter accommodating portion, and it is possible to confirm whether or not an indicator light (LED) provided in the filter portion is turned on through the display hole.

The plug portion 140 is inserted into the rotary member 20, wherein the pair of terminals 141 are exposed to the outside through a hole formed in the rotary member 20. [ The plug portion 140 is fixed to the rotary member 20 by fitting the fixing member 40 into the rotary member 20 in a state where the plug portion 140 is inserted into the rotary member 20. [ As shown in Fig. 4, the plug portion 140 is rotated with respect to the case portion together with the rotating member when the rotating member 20 is rotated. The plug unit 140 is connected to an external cone center to receive AC power.

As shown in FIG. 3, the receptacle 130 is installed in the plug inserting portion of the upper case, and is disposed above the plug portion 140. When the outer plug is inserted into the insertion hole 312 of the plug inserting portion, the receptacle portion 130 is connected to the outer plug to supply power to the outer plug.

The filter unit 120 is installed inside the filter accommodating unit 32 of the upper case. The filter unit 120 cuts off the AC electromagnetic wave from the AC power supplied through the plug unit 140 and supplies power to the electrical / electronic apparatus connected to the receptacle unit 130 through the receptacle unit 130. The filter unit 120 is preferably made of a printed circuit board. Fig. 5 shows a detailed configuration of the filter unit 120. Fig. 5, the filter unit 130 includes an overcurrent cutoff unit 210, a surge cutoff unit 220, a discharge unit 230, a conductive electromagnetic wave and EFT cutoff unit 240, and a grounded electromagnetic cutoff unit 250 Respectively.

The overcurrent shut-off unit 210 includes a fuse connected in series to the first power input terminal AC_L1 to cut off the power supply to the filter unit 120 when the overcurrent flows. The surge interrupter 220 includes a first varistor M? V1 connected between the first power input terminal AC_L1 and the second power input terminal AC_N1, a first power input terminal AC_L1 and an input ground terminal F_G1 And a third varistor M? V3 connected between the second power input terminal AC_N1 and the input ground terminal F_G1. The surge introduced from the AC power source is connected to the first varistor M_V2, (120). ≪ / RTI > The discharge unit 230 includes a resistor R1 connected between the first power input terminal AC_L1 and the input ground terminal F_G1 and connected to the capacitors C1, C2, C3 are charged with a current, they are discharged immediately to prevent malfunction of the filter unit 120 due to an electric shock and charging current. The conductive electromagnetic wave and EFT blocking unit 240 reduces the conductive electromagnetic wave and EFT from the AC power source. The conductive electromagnetic wave and EFT blocking unit 240 includes a first capacitor C1 connected between a first power input terminal AC_L1 and an input ground terminal F_G1, a first power input terminal AC_L1 and an input ground terminal F_G1 A second capacitor C2 and a third capacitor C3 connected in series between the first power input terminal AC_L1 and the second capacitor C2 and the second power input terminal A first inductor L1 connected to a common node of the first capacitor AC_N1 and the third capacitor C3 and having two output terminals connected to a first power output terminal AC_L2 and a second power output terminal AC_N2, And a fourth capacitor C4 connected to the output terminal AC_L2 and the second power output terminal AC_N2. The grounding electromagnetic wave shielding unit 250 is constituted by a second inductor L2 connected between the input ground terminal F_G1 and the output ground terminal F_G2 and reduces electromagnetic waves flowing into the security ground of the AC power source. The common contact of the second capacitor C2 and the third capacitor C3 and the common contact of the input ground terminal F_G1 and the second inductor L2 are connected by a jumper wire. In addition, the filter unit 120 includes a display unit (LED) for indicating whether a normal operation is performed or not.

On the other hand, an AC power source of 100 V or 220 V will be described with reference to FIG. The capacities of the first capacitor C1 and the second capacitor C2 among the elements included in the filter unit 120 are determined from 1,000 pF to 100,000 pF and the capacitances of the third capacitor C3 and the fourth capacitor C4 are determined, Is determined between 1,000 pF and 10,000 pF, and the capacities of the first inductor (L1) and the second inductor (L2) are determined between 200 μH and 5 mH. Further, the electromagnetic wave conduction standard, EFT / burst immunity standard, and surge immunity standard are as shown in the following table, and those skilled in the art will be able to understand each of the The device capacity can be easily determined.

Item Electromagnetic wave conduction standard EFT / burst immunity criterion Surge immunity standard Information communication system 73 dB or less Between 1 ㎸ and below 2 ㎸ surge to class B Electromagnetic wave filter performance Maintain 50 ㏈㎶ 0 to 2 ㎸ at A grade Class A to 4 ㎸ Device capacity L = 500 μH to 10 mH
C = 10 ㎊ ~ 10 ㎌ Varistors AC 11 to 1000 V
DC 14 ~ 1465 V
C = 10 ㎊ ~ 10 ㎌ Varistors AC 11 to 1000 V
DC 14 ~ 1465 V

The receptacle 130 has a standardized receptacle and is electrically connected to an output terminal of the filter unit 120. The plug unit 140 has a standardized plug and is electrically connected to an input terminal of the filter unit 120. [

In the electromagnetic wave shielding device constructed as described above, the plug portion can be rotated with respect to the case portion as shown in Fig. Therefore, as shown in Fig. 6, after the plug portion is inserted into the multi-outlet, the case portion can be rotated so as not to cover the adjacent outlet, so that all of the outlet can be used.

Further, as shown in Fig. 6, when the plug portion of the electromagnetic wave shielding apparatus is inserted into the receptacle of another electromagnetic wave shielding apparatus, a plurality of electromagnetic shielding apparatuses can be connected to each other. When the plurality of electromagnetic wave shielding devices are connected to each other, the filter portions of the electromagnetic wave shielding devices are connected to each other, and a plurality of mutually connected filter portions can block a larger electromagnetic wave. That is, according to the present invention, when a plurality of electromagnetic wave shielding devices are connected to each other as needed, the electromagnetic wave shielding performance (capacity) can be improved.

8 is an exploded perspective view of an electromagnetic wave shielding apparatus according to another embodiment of the present invention.

Referring to FIG. 8, in the case of the electromagnetic wave shielding device according to the present embodiment, a plurality of grooves 112A are formed in the lower case so as to be concave downwardly around the perforations 111. FIG. The protruding portion 212A is formed on the flange portion 211A of the rotary member so as to protrude downward. When the rotary member 20A is inserted into the through hole 111, the protrusion 212A is inserted into the groove 112A.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the embodiment in which said invention is directed. It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

100 ... electromagnetic wave shielding device 10 ... lower case
20 ... rotating member 30 ... upper case
50 ... case part 120 ... filter part
130 ... receptacle part 140 ... plug part

Claims (4)

A plug portion receiving AC power;
A socket for supplying the AC power to an external device;
A filter unit for blocking or reducing the AC electromagnetic wave from the AC power supplied through the plug unit and supplying the AC power to the outlet unit; And
And a case portion accommodating the filter portion therein and coupled to the receptacle portion and the plug portion,
And the plug portion is rotatably coupled to the case portion. The method according to claim 1,
In the case,
A lower case through which a circular through hole is formed,
And a rotating member inserted rotatably into the through hole,
And the plug portion is coupled to the rotating member. 3. The method of claim 2,
The lower case is provided with concave and convex portions formed along the circumferential direction of the through hole,
Wherein the rotary member is provided with a protrusion inserted into the concave-convex portion. The method according to claim 1,
The filter unit includes:
An overcurrent blocking unit configured to be connected in series to the first power input terminal and configured to cut off the power supply when the overcurrent flows into the fuse;
A first varistor connected between the first power input terminal and the second power input terminal, a second varistor connected between the first power input terminal and the input ground terminal, and a second varistor connected between the second power input terminal and the input ground terminal A surge blocking unit configured by a third varistor for blocking a surge flowing from the AC power source;
A first capacitor connected between the first power input terminal and the input ground terminal; a second capacitor and a third capacitor connected in series between the first power input terminal and the input ground terminal; A first capacitor connected between a power input terminal and a common contact of the second capacitor and a common contact of the second power input terminal and the third capacitor and having two output terminals connected to a first power output terminal and a second power output terminal, A conductive electromagnetic wave and an EFT blocking unit comprising an inductor and a fourth capacitor connected to the first power output terminal and the second power output terminal to reduce conductive electromagnetic waves and EFT from the AC power supply;
A discharger connected to the first power input terminal and the input ground terminal for discharging a current charged in the first capacitor to the third capacitor; And
And a second inductor connected between the input ground terminal and the output ground terminal to reduce an electromagnetic wave flowing into the security ground of the AC power source.

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