Electromagnetic wave isolating PLUG structure

Abstract

The present invention relates to a power plug, and more specifically, to a plug structure that incorporates a separate additional configuration on the outside of a power line to prevent electromagnetic waves generated at the connection point of the plug when the plug is inserted into an outlet. The present invention has the effect of completely shielding the electric field generated from the wire connected to the outlet so as not to affect the human body. Furthermore, the present invention has the effect of shielding the electric field from the wire connected to the outlet with only a simple configuration.

Description

Technology Field

[0001] The present invention relates to a power plug, and more specifically, to a plug structure that introduces a separate additional configuration on the outside of the power cord to prevent electromagnetic waves generated at the connection part of the plug when the plug is inserted into an outlet. Background Technology

[0003] Generally, each electrical device, such as electronic and heating products like TVs, computers, air conditioners, and electric blankets, as well as office automation equipment or production facilities, is equipped with a power plug that is inserted into a power outlet for electrical connection. This power plug serves as a plug cap connected to an electrical circuit outlet to introduce power to the device; it is attached to the end of a power cord and used to be inserted into an outlet. Typically, such a power plug comprises a pair of power terminals to which a power cord is connected, and a main body that secures these power terminals.

[0004] A plug is equipped with two or three terminals to supply electricity ranging from 50Hz to 60Hz and 100V to 250V to a device using electricity, and one of these terminals is grounded to eliminate electromagnetic waves and electric fields. In the case of a plug equipped with three terminals, one terminal is grounded, and alternating current flows through the remaining two terminals.

[0006] FIG. 1 is a drawing showing a general plug, and FIG. 2 is a drawing showing a cross-section of a general plug. Referring to FIG. 1 and FIG. 2, the power plug (100) is structured to include a pair of power terminals (110), a ground terminal (120), and a main body (140).

[0007] A power plug structure comprising a pair of power wires (a) connected to a power terminal (110) of a power plug (100) and a ground wire (b) connected to a ground terminal (120), and a power outlet into which the plug (100) is inserted are in a conventional configuration, and the power outlet is omitted in the drawing.

[0008] The plug (100) is compliant with domestic KS standards and has two power wires (a) and one ground wire (b), and is described as a power plug typically used at 220V. The power terminal (110) is a part inserted into a power outlet and is formed in the shape of a pin, with one end protruding toward the front, and the connection part (112) of the other end is provided with a terminal part so that it can be easily connected to the power wire (a). This power terminal (110) typically exists in a form where a pair of pins are located on the left and right so that it can be inserted into a power outlet.

[0009] The grounding terminal (120) is connected to a grounding wire (b) to perform a grounding function and is a part connected to the grounding terminal (not shown) of a power outlet. A protruding piece (121) is formed at a position spaced above or below the power terminal (110) so as to correspond to the position where the grounding terminal of a general power outlet is formed, that is, the position of the edge portion spaced above and below the pair of connection terminals placed on the left and right. This grounding terminal (120) may have a connection part (120a) formed extending from the protruding piece (121) and connected to the rear side where the grounding wire is connected.

[0010] The grounding terminal (120) can generally be formed such that a pair of protruding pieces (121) are located on the upper and lower sides, and it is preferable to form an extension piece (122) that extends vertically to connect the protruding pieces (121) so that a connection terminal part (120a) is extended. Accordingly, the connection part (120a) can be formed adjacent to either of the protruding pieces (121) located on the upper or lower side, and in the illustrated drawing, it is located on the lower side.

[0012] FIG. 3 is a circuit diagram showing the connection relationship of a typical plug. Referring to FIG. 3, the two power terminals (110) of the plug (100) are connected to an outlet, one is connected to the hot line (L), and the other is connected to the neutral line (N), so that AC power flows through the power line (a). The grounding line (b) is grounded by connecting the grounding line (G) of the outlet to the grounding terminal (120), thereby grounding the electrical and electronic equipment.

[0013] However, since alternating current flows through the power line (a), an electric field and an induced magnetic field are generated. These electromagnetic waves have a harmful effect on the human body, and it is very important to block electromagnetic waves, especially in bedding that comes into contact with the human body for a long time. Prior art literature

[0015] Korean Patent Publication 10-2020-0003461 (Published January 10, 2020) The problem to be solved

[0016] The present invention aims to provide a plug and wire combination structure that shields a leakage electric field generated in a plug and a wire connected thereto.

[0017] In addition, the present invention aims to provide a plug structure having a configuration capable of shielding a leakage electric field by utilizing the grounding terminals of the outlet and the plug with only a simple structure.

[0018] Other objects and advantages of the present invention may be understood from the following description and will become more clearly apparent from one embodiment of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0020] The present invention, for achieving the above objective, provides an electromagnetic shielding plug structure comprising a plug (100) and a wire, wherein the plug (100) is provided with a power terminal (110) and a ground terminal (120), the wire is provided with a power line (a) and a ground line (b), and includes a grounding surface body (B) connected to the ground line (b).

[0021] Additionally, the present invention provides an electromagnetic shielding plug structure comprising a plug (400) and a wire, wherein the plug (400) is provided with a power terminal (410), the wire is provided with a power line (a) and a ground line (b), and includes a grounding surface (B) connected to the ground line (b).

[0022] The above wire is characterized in that a power line (a) is positioned in the inner center, and a grounding surface (B) is positioned to surround the power line (a), and the power line (a) and the grounding surface (B) are insulated from each other, and the grounding surface (B) is connected to the grounding line (b), and the grounding line (b) is connected to the grounding terminal (120).

[0023] The above wire is characterized in that a power line (a) is positioned in the inner center, and a grounding surface (B) is positioned to surround the power line (a), and the power line (a) and the grounding surface (B) are mutually insulated, and the grounding surface (B) is connected to the grounding line (b), and the grounding line (b) is connected to one of the power terminals (410).

[0024] The above ground plane (B) is made of a conductor and is characterized by being in the form of a plane or having a form in which a plurality of wires overlap.

[0025] The above ground wire (b) is characterized by having a resistor (300) for limiting inrush parasitic current connected to it. Effects of the invention

[0027] The present invention has the effect of completely shielding the electric field generated from the wire connected to the outlet so as not to affect the human body.

[0028] In addition, the present invention has the effect of shielding the electric field in a wire connected to an outlet with only a simple configuration. Brief explanation of the drawing

[0030] Figure 1 is a drawing showing a typical plug. Figure 2 is a drawing showing a cross-section of a typical plug. Figure 3 is a circuit diagram showing the connection relationship of a typical plug. FIG. 4 is a circuit diagram showing the connection relationship of a plug according to the present invention. FIG. 5 is a drawing showing a plug connection structure according to the present invention. FIG. 6 is a circuit diagram showing the connection relationship of a plug of another embodiment according to the present invention. Figure 7 is a graph showing the inrush current when the power is turned on and off of a circuit system without a limit resistor. Figure 8 is a graph showing the inrush current when the power is turned on and off of a circuit system with a limit resistor. FIG. 9 is a circuit diagram showing the connection relationship of a plug of another embodiment according to the present invention. Specific details for implementing the invention

[0031] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. The embodiments described herein are provided to ensure that the disclosure of the invention is complete and to fully inform those skilled in the art of the scope of the invention. Furthermore, the present invention is defined only by the claims, and in some embodiments, well-known components, well-known operations, and well-known techniques may be omitted to avoid the present invention being interpreted ambiguously.

[0032] Throughout the specification, the same reference numerals refer to the same components. The terms used in this specification are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. Additionally, components and operations referred to as "comprising (or comprising)" do not exclude the presence or addition of one or more other components and operations. Unless otherwise defined, all terms used in this specification may be used in a meaning commonly understood by those skilled in the art to which the invention pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless otherwise defined.

[0034] FIG. 4 is a circuit diagram showing the connection relationship of a plug according to the present invention. Referring to FIG. 4, a ground wire (b) connected to the ground terminal (120) of the plug (100) is connected to a ground plane body (B).

[0035] The grounding plane (B) is formed of a planar conductor and may be a woven or braided conductor or a thin plate-shaped conductor. The grounding plane (B) is arranged to surround the outside of the power lines (a) without being directly connected to the power lines (a), and is connected to the grounding line (b).

[0036] When alternating current is applied to the power line (a), the leakage electric field generated outwardly is conducted and absorbed by the grounding surface body (B) spaced outwardly, and is grounded through the grounding terminal (120) along the grounding line (b), thereby having the effect of shielding the electric field.

[0038] FIG. 5 is a drawing showing a plug connection structure according to the present invention. Referring to FIG. 5, the wire connected to the plug (100) has a pair of power lines (a) at the innermost part, and the power lines (a) are insulated and wrapped by an inner covering (210).

[0039] A grounding body (B) is positioned to surround the outside of the power line (a), and one side of the grounding body (B) is connected to the ground line (b). Since the grounding body (B) completely surrounds and shields the outside of the power line (a), leakage electricity generated from the power line (a) can be shielded by the grounding body (B).

[0040] The grounding surface (B) can be selected and used according to its properties and functions, such as a combination of multiple overlapping aluminum wires, copper wires, lead wires, braids, metal foils, etc.

[0042] FIG. 6 is a circuit diagram showing the connection relationship of a plug of another embodiment according to the present invention. Referring to FIG. 6, the grounding wire (b) is further provided with a resistor (300) for limiting inrush parasitic current between the connection path with the grounding line (G) of the outlet.

[0043] Inrush parasitic current limit resistors are used to limit the inrush current that occurs when power is applied. Inrush current refers to the temporary application of a current greater than the rated current when power is input or switched on to an electrical device, and the current that flows temporarily at that moment is called inrush current.

[0044] Generally, when configuring a power circuit, large capacitors are used to ensure a stable supply of power. Large capacitors tend to be preferred because they are resistant to noise and perform better as a buffer against excessive voltage drops. However, in such circuit designs, a problem may occur when power is first applied. Since the capacitor is discharged before power is applied, a sudden surge of current occurs to charge it, and the circuit breaker may detect this as a leakage current and cut off the power.

[0045] Since current flows by multiplying the derivative of the applied voltage by the capacitor capacitance, the larger the capacitor capacitance and the higher the applied voltage, the greater the magnitude of the current becomes, damaging the capacitor and various other components. In other words, inrush current occurs when a capacitor charges rapidly, which can damage circuit components; therefore, limit resistors are used to limit this inrush current. Limit resistors reduce inrush current by limiting capacitor charging when power is applied.

[0047] Figure 7 is a graph showing the inrush current when the power is turned on and off for a circuit system without a limit resistor, and Figure 8 is a graph showing the inrush current when the power is turned on and off for a circuit system with a limit resistor. Referring to Figure 7, in a circuit with a load resistor of 20Ω and an electrolytic capacitor of approximately 100uF and an ESR of 50mΩ connected thereto, in the case without a limit resistor, if the power source V is turned on and off repeatedly with a period of 2ms, it can be confirmed that a positive current of approximately 240A flows instantaneously when the power is turned on, and a negative current of -240A is generated when the power is turned off. In other words, it can be seen that a rapid flow of current occurs by charging and discharging the capacitor.

[0048] Referring to FIG. 8, if a resistor (30) with an inrush parasitic current limit of 50 mΩ, which is equal to the ESR of the capacitor, is added, the capacitor's charging time is doubled as the resistance R is doubled, and the inrush current is also reduced by half, thereby preventing the leakage circuit breaker from malfunctioning due to the inrush parasitic current.

[0050] FIG. 9 is a circuit diagram showing the connection relationship of a plug according to another embodiment of the present invention. Referring to FIG. 9, in a two-wire plug (400) without a ground line (G) and a ground terminal (120), only a power terminal (410) exists. At this time, the ground line (b) connected to the ground surface body (B) is connected to one side of the power terminal (410) instead of the ground terminal, so that it can be connected to the neutral line (N).

[0052] While this specification contains many features, such features should not be interpreted as limiting the scope of the invention or the claims. Additionally, features described in individual embodiments of this specification may be combined and implemented in a single embodiment. Conversely, various features described in a single embodiment of this specification may be individually implemented in various embodiments or appropriately combined and implemented.

[0053] The present invention described above is not limited by the aforementioned embodiments and attached drawings, as various substitutions, modifications, and changes are possible within the scope of the technical concept of the present invention for those skilled in the art to which the present invention belongs. Explanation of the symbols

[0055] 100 : Plug 110 : Power terminal 112 : Connection part 120 : Grounding terminal 120a : Connection part 121 : Protruding piece 122 : Extension 140 : Main body 210 : Inner covering 220 : External covering 300: Resistor for inrush parasitic current limit 400 : Plug 410 : Power terminal a : Power line b : Ground wire B: Ground plane

Claims

Claim 1 An electromagnetic wave shielding plug structure comprising a plug and a wire, wherein the plug is provided with a power terminal and a ground terminal, the wire is provided with a power line and a ground line, and includes a grounding surface connected to the ground line. Claim 2 An electromagnetic wave shielding plug structure comprising a plug and a wire, wherein the plug is provided with a power terminal, the wire is provided with a power line and a ground line, and includes a grounding surface connected to the ground line. Claim 3 An electromagnetic shielding plug structure according to claim 1, wherein the above-mentioned wire has a power line disposed in the internal center, the above-mentioned grounding surface is disposed to surround the power line, the power line and the above-mentioned grounding surface are mutually insulated, the above-mentioned grounding surface is connected to the ground line, and the above-mentioned ground line is connected to the grounding terminal. Claim 4 An electromagnetic shielding plug structure according to paragraph 2, wherein the above-mentioned wire has a power line positioned in the internal center, the above-mentioned grounding surface is positioned to surround the power line, the above-mentioned power line and the above-mentioned grounding surface are mutually insulated, the above-mentioned grounding surface is connected to the above-mentioned ground line, and the above-mentioned ground line is connected to one of the power terminals. Claim 5 An electromagnetic shielding plug structure according to claim 3 or 4, wherein the grounding surface is made of a conductor and is in the form of a surface or a form in which a plurality of wires overlap. Claim 6 An electromagnetic shielding plug structure characterized in that, in claim 1 or 2, a resistor for limiting inrush parasitic current is connected to the grounding wire.

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