KR100337796B1 - Multi-Tap for attenuating microwave - Google Patents

Abstract

The present invention relates to an auxiliary outlet that is capable of displaying the state of generation of unwanted electromagnetic waves generated from electrical noise connected to the auxiliary noise and self-noise of AC power flowing from an outlet, and attenuating the noise and unnecessary electromagnetic waves. An auxiliary outlet having a plug for connecting to an outlet, a conductive wire electrically connected to the plug, and at least one plug insertion hole connected in parallel to the conductive wire; In order to filter the electromagnetic wave and high frequency noise generated from the AC power applied through the conductive wires and the electrical appliances connected thereto, the filter unit is configured by combining the choke coil and the low pass filter in parallel, and the AC power filtered by the filter unit. A power supply unit for rectifying a predetermined DC power supply, and a DC power applied from the power supply unit as an operating power supply, and connected to an output terminal of the filter unit to attenuate a state of high frequency noise generated from an AC power supply and an electrical product connected thereto. An electromagnetic wave attenuation circuit comprising an electromagnetic wave end portion displayed through a flashing operation of a predetermined light emitting means provided therein is electrically connected to the conductive wire and the plug insertion hole.

Description

Auxiliary outlet with electromagnetic wave attenuation function {Multi-Tap for attenuating microwave}

The present invention relates to an auxiliary outlet used to be connected to an outlet, and in particular, indicates the noise generated from the AC power flowing from the outlet and an unwanted electromagnetic wave generated from an electrical appliance connected to the auxiliary outlet. This is for the auxiliary outlets that can be used to attenuate.

In general, the outlet is used as an electrical supply terminal of various electrical appliances connected thereto, which is electrically coupled to an electric lead wire into which AC power of single-phase 110V or three-phase 220V flows.

In addition, the AC power flowing into the electric lead wire is affected by an instantaneous power interruption and voltage fluctuation due to the noise of its own and abnormal operation of the substation, or by the noise generated from the electronic products connected to the outlet. This will act as a factor that prevents the stable operation of electrical appliances connected to the outlet.

In addition, the AC power flowing through the outlet may be affected by a sudden surge voltage caused by lightning, which has a significant effect on the internal circuit of the electrical appliance.

Therefore, in recent years, surge voltage suppression circuits have been provided in auxiliary outlets to prevent damage to internal circuits of electrical appliances caused by lightning strikes, and high frequency cut-off filters have been provided to attenuate the unwanted electromagnetic waves.

However, the user was inconvenient to check how much noise and unwanted electromagnetic waves are generated from the AC power supply and electrical appliances, and how efficiently the noise or unnecessary electromagnetic waves are attenuated by the filter in the auxiliary outlet.

In addition, in the case of the high frequency cut-off filter provided in the conventional auxiliary outlet, there is a problem that it is not possible to efficiently attenuate noise by simply using a low pass filter made of a combination of an inductor and a capacitor.

Accordingly, the present invention has been made in view of the above circumstances, and displays a state of generation of unwanted electromagnetic waves and noise induced from an AC power source and an electrical appliance connected thereto by providing predetermined filtering means and electromagnetic wave detecting means in an auxiliary outlet. In addition, the purpose of the present invention is to provide an auxiliary outlet having an electromagnetic attenuation function capable of attenuating it.

In addition, the present invention is provided by the predetermined filtering means and the electromagnetic wave detection means in the auxiliary outlet to display the generation state of the unwanted electromagnetic waves and noise induced from the AC power source and the electrical appliances connected thereto, and to block the auxiliary power outlet Another purpose is to provide an auxiliary outlet having an electromagnetic wave attenuation function having a predetermined telephone line connection port and an interference cancellation and lightning protection circuit on the telephone line connected thereto.

1 is an external perspective view showing the external configuration of an auxiliary outlet with an electromagnetic attenuation function according to an embodiment of the present invention.

FIG. 2 is a block diagram schematically showing the configuration of the electromagnetic wave attenuating circuit which is provided in the auxiliary outlet shown in FIG.

3 is a circuit diagram showing the internal configuration of the electromagnetic wave attenuation circuit shown in FIG.

Figure 4 is an external perspective view showing the external configuration of an auxiliary outlet with an electromagnetic attenuation function according to another embodiment of the present invention.

Figure 5 is a circuit diagram showing the internal configuration of the auxiliary outlet with an electromagnetic attenuation function according to another embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: filter part, 20: power supply part,

30: electromagnetic wave diagnosis part, 40: breaker,

SW1: first switch, SW2: second switch,

AC: AC power, L1: Choke coil,

L2: first inductor, L3: second inductor,

31: oscillator, LD1: first light emitting diode,

LD2: second light emitting diode, MR1, MR2: magnetoresistance.

An auxiliary outlet having an electromagnetic wave attenuation function according to the present invention for achieving the above object has an auxiliary outlet having a plug for connecting to an outlet, a conductor electrically connected to the plug, and at least one plug insertion hole connected in parallel to the conductor. To; In order to filter the electromagnetic wave and high frequency noise generated from the AC power applied through the conductive wires and the electrical appliances connected thereto, the filter unit is configured by combining the choke coil and the low pass filter in parallel, and the AC power filtered by the filter unit. A power supply unit for rectifying a predetermined DC power supply, and a DC power applied from the power supply unit as an operating power supply, and connected to an output terminal of the filter unit to attenuate a state of high frequency noise generated from an AC power supply and an electrical product connected thereto. An electromagnetic wave attenuation circuit composed of an electromagnetic wave end portion displayed through a flashing operation of a predetermined light emitting means provided therein is electrically connected to the conductive line and the plug insertion hole.

The electromagnetic wave attenuation circuit further comprises a switching unit electrically connected between an AC power output end of the filter unit and an input end of the electromagnetic wave end part to selectively switch the AC power output end and the input end of the electromagnetic wave end part. do.

In addition, an auxiliary outlet having an electromagnetic wave attenuation function for achieving another object of the present invention is an auxiliary having a plug for connecting to an outlet, a conductor electrically connected to the plug and at least one plug insertion hole connected in parallel to the conductor. In an outlet; In order to filter the electromagnetic wave and high frequency noise generated from the AC power applied through the conductive wires and the electrical appliances connected thereto, the filter unit is configured by combining the choke coil and the low pass filter in parallel, and the AC power filtered by the filter unit. A power supply unit for rectifying a predetermined DC power supply and a DC power source applied from the power supply unit as an operating power source, and connected to an output terminal of the filter unit to attenuate high frequency noise generated from an AC power source and an electrical product connected thereto. An electromagnetic wave attenuation circuit including an electromagnetic wave end portion displayed through a flashing operation of a light emitting diode provided therein is electrically connected to the conductor and the plug insertion hole, and the interference of the telephone line is removed from the ground end of the electromagnetic wave attenuation circuit. Certain circuits for lightning protection are constructed by combining It is characterized by.

That is, according to the present invention having the above-described configuration, by connecting the choke coil to the low pass filter, the electromagnetic wave and noise blocking characteristics can be improved, and the electromagnetic and noise attenuation states can be displayed to the user through predetermined light emitting means. Will be.

Hereinafter, with reference to the accompanying drawings will be described the present invention.

That is, Figure 1 shows the external configuration of the auxiliary outlet with the electromagnetic wave attenuation function according to an embodiment of the present invention, the upper portion of the auxiliary outlet main body (1) is provided with a plurality of plug insertion (CON), each The plug insertion hole (CON) is provided with three insertion grooves into which the plug of the electrical appliance is inserted, and the insertion grooves are electrically connected to two AC power output terminals (AC1, AC2) and one ground terminal (G) in the auxiliary outlet. Connected.

In addition, the upper part of the main body 1, the first switch (SW1) for selectively switching the inflow of AC power applied to the auxiliary outlet through the conductive line (LIN1) connected to the plug (FL) and electromagnetic waves and noise blocking The light emitting diodes LD1 and LD2 are provided for displaying a state, and the light emitting diodes LD1 and LD2 are provided with a first light emitting diode for displaying the operation of a predetermined electromagnetic wave attenuating circuit provided in an auxiliary outlet. LD1) and a second light emitting diode LD2 for displaying attenuation states of electromagnetic waves and noise.

In addition, a second switch SW2 is provided on an upper surface of the auxiliary outlet main body 1 for a user to selectively check attenuation states of electromagnetic waves and noise, which will be described in detail later.

FIG. 2 is a block diagram schematically showing the configuration of the electromagnetic wave attenuating circuit provided in the auxiliary outlet shown in FIG. 1, and the same reference numerals will be omitted for the same configuration as that shown in FIG. Attach.

That is, in FIG. 2, reference numeral 10 denotes a filter unit in which a choke coil and a low pass filter are combined in parallel to filter electromagnetic waves and high frequency noise generated from an AC power source applied through the conductive line LIN1 and an electrical product connected thereto. As shown in FIG. 3, the choke coil L1, the TNA (Themal Nagative Resistor), and the capacitor C1 are sequentially coupled in parallel to an AC power source of single phase 110V or three phase 220V, and the capacitor A first inductor L2 and a second inductor L3 are coupled in series to the two terminals of C1, respectively, and intermediate terminals of the first inductor L2 and the second inductor L3 are shorted to each other. The other terminal has a structure in which the capacitors C2 are stacked in parallel.

In this case, the choke coil L1 has an electrical characteristic similar to that of an inductor and performs a function of attenuating electromagnetic waves of the power supply circuit when connected to the power supply circuit. Therefore, the AC power AC in which the unwanted electromagnetic waves are attenuated through the choke coil L1 is coupled through the capacitor C1, and then the first and second inductors L2 and L3 and the capacitor ( By passing through the low pass filter constituted by C2), the noise is secondarily attenuated.

In addition, the filter unit 10 removes noise generated from an electrical product connected to an auxiliary power outlet as well as AC power itself, through the circuit configuration described above.

In FIG. 2, reference numeral 20 denotes a power supply for rectifying the AC power AC filtered by the filter unit 10 into a stable DC power and supplying operation power to a predetermined circuit connected thereto. As shown in FIG. 2, the capacitor C3 and the first magnetoresistive MR1 are coupled in parallel between the connection node of the first inductor L2 and the capacitor C2 and the resistor R1, and The anode of the diode D1 is coupled to the other terminal, and the cathode of the diode D1 is coupled to the base end of the transistor Q1 through the resistor R2, and the cathode and the resistor R2 of the diode D1 are coupled. Zener diode (ZD) and capacitor (C4) are connected in parallel through the ground terminal, and resistor (R3) is connected in parallel via the ground terminal to resistor (R2) and transistor (Q1). The emitter terminal of the transistor Q1 is large. It is in a configuration coupled to the node between the capacitors (C4) and a resistor (R2).

That is, when AC power AC is applied through the filter unit 10, the capacitor C3 and the magnetoresistive MR1 coupled in parallel stabilize the AC power AC, and the AC power diode is a diode. After half-wave rectification through D1, a stable DC power is applied to the base terminal of the transistor Q1 through the smoothing circuit composed of the capacitor C4 and the resistors R2 and R3 to drive it on. At this time, the zener diode ZD maintains a stable constant voltage.

Accordingly, the power supply unit 20 supplies stable operating power with ripple removed to the AC power supply AC and a predetermined circuit connected thereto.

In FIG. 2, reference numeral 30 denotes a DC power source applied from the power supply unit 20 as an operating power source, and is connected to the output terminals AC1 and AC2 of the filter unit 10 through predetermined switching means. (AC) and an electromagnetic wave diagnostic end portion which displays the attenuation state of the high frequency noise generated from the electrical appliance connected thereto through the flashing operation of a predetermined light emitting means provided therein, which is the transistor Q1 as shown in FIG. ) Is connected to the power input terminal (V _IN ), the signal input terminal (IN) is connected to one terminal (c) of the second switch (SW2) through a resistor (R5) and a capacitor (C6), The first output terminal OUT1 is coupled to the anode of the first light emitting diode LD1 through the second magnetoresistive MR2, and the second output terminal OUT2 is provided with an oscillator coupled to the anode of the second light emitting diode LD2. And third and fourth output terminals T1 and T2 of the oscillator 31, respectively. Each coupled resistor R6 and a connection node of the capacitor C7 are connected to the second light emitting diode LD2, and the cathodes of the first and second light emitting diodes LD1 and LD2 are respectively coupled to a ground terminal. A resistor R4 and a capacitor C5 are connected in parallel to the connection node of the second switch SW2 and the capacitor C6 and connected to the ground terminal.

In the second switch SW2, a first terminal a and a second terminal b are connected to the output terminals AC1 and AC2 of the filter unit 10, respectively, and the third terminal c is connected to the second terminal SW2. It is connected to the signal input terminal IN of the oscillator 31 through a capacitor C6 and a resistor R5 coupled in series, and according to a user's switching operation, the first terminal a and the third terminal c. Is connected or the second terminal (b) and the third terminal (c) are connected.

That is, the electromagnetic wave terminal 30 is a predetermined operating power is applied from the power supply unit 20 to the power input terminal (V _IN ) of the oscillator 31, the electromagnetic wave and noise is attenuated through the filter unit 10. When the alternating current AC is applied to the signal input terminal IN through the capacitor C6 and the resistor R5, the oscillator 31 emits electromagnetic waves of the AC power AC flowing from the signal input terminal IN. And a voltage level signal of a predetermined clock through the first and second output terminals OUT1 and OUT2, respectively, based on the noise generation state.

In this case, the signal output from the first output terminal OUT1 is for indicating an operation state of the electromagnetic wave attenuation circuit. When the electromagnetic wave attenuation circuit performs a normal operation, a high level signal is output, whereby the user may output the first light emitting diode ( Through the LD1) it is possible to check the operating state of the electromagnetic wave blocking circuit.

The signal output from the second output terminal OUT2 is for indicating attenuation states of electromagnetic waves and noise. When the number of clocks of the voltage level signal output from the second output terminal OUT2 is increased, the AC power source AC ) And when a large amount of electromagnetic waves and noise are generated from electrical appliances, and the case where the clock number of the voltage level signal is reduced indicates that electromagnetic waves and noise are attenuated.

Meanwhile, the resistor R6 and the capacitor C7 vary based on predetermined low frequency signals output through the third and fourth output terminals T1 and T2 of the oscillator 31 according to the generation of electromagnetic waves and noise. The number of flashes of the second light emitting diode LD2 is output from the second output terminal OUT2 and the third and fourth output terminals T1 and T2 according to the degree of generation of electromagnetic waves and noise. By increasing or decreasing based on the voltage level signal and the low frequency signal, the user can check the state of electromagnetic waves and noise attenuated by the filter unit 10.

In FIG. 2, reference numeral 40 denotes a series connected between the AC power supply AC and the choke coil L1 so that the circuit may be overloaded or a sudden overcurrent may flow into the circuit. It is to cut off the electrical connection.

The operation of the present invention having the above configuration will be described below.

If the user switches the first switch SW1 to ON while the plug FL of the auxiliary outlet is electrically connected to a predetermined outlet (not shown) provided in the user's building, AC Electromagnetic waves flowing into auxiliary outlets when various electric appliances (not shown) such as a computer device used by a user are connected to a plurality of plug insertion grooves (CON) provided in the auxiliary outlets, as well as the electromagnetic waves of the power source (AC) and high frequency noise. And high frequency noise is also attenuated through the filter unit 10.

That is, the AC power source AC in which electromagnetic waves are attenuated through the choke coil L1 in the filter unit 10 is coupled through the capacitor C1, and then the first and second inductors L2 and L3. The noise is secondarily attenuated by passing through the low pass filter configured by the capacitor C2.

Subsequently, when the filtered AC power AC is applied, the power supply unit 20 stabilizes the same through the parallel-coupled capacitor C3 and the magnetoresistive MR1. The AC power source AC controls the diode D1. After half-wave rectification through the smoothing circuit composed of the capacitor (C4) and the resistors (R2, R3) to supply the operating power to the base terminal of the transistor (Q1) to drive (ON) by driving the collector stage of the transistor (Q1) A predetermined DC power is output from the power supply, which is applied to the power input terminal V _IN of the oscillator 31 in the electromagnetic wave end 30 to be used as the operating power of the oscillator 31.

Subsequently, the oscillator 31 in the electromagnetic wave diagnosis terminal 30 has an AC power source AC in which electromagnetic waves and noise are attenuated through the filter unit 10 through a capacitor C6 and a resistor R5 through the signal input terminal IN. When applied to, the voltage level signal of the predetermined clock is output to the first and second output terminals OUT1 and OUT2, respectively, according to the electromagnetic wave and noise generation state of the AC power source AC.

At this time, when the electromagnetic wave attenuation circuit performs a normal operation, a high level signal is output from the first output terminal OUT1 to drive the first light emitting diode LD1 on. It becomes possible.

On the other hand, when a large amount of electromagnetic waves and noise are generated from the AC power source (AC) and electrical appliances, the number of clocks of the voltage level signal output through the second output terminal (OUT2) is increased to increase the number of flashes of the second light emitting diode (LD2). When the electromagnetic wave and the noise are attenuated, the number of clocks of the voltage level signal is reduced, so that the number of flashes of the second light emitting diode LD2 is also reduced.

In addition, the low frequency signals output from the third and fourth output terminals T1 and T2 of the oscillator 31 change the time constants of the capacitor C7 and the resistor R6, and thus, the second light emitting diode LD2. ), The number of flashes is increased or decreased based on the voltage level signal and the low frequency signal output from the second output terminal OUT2 and the third and fourth output terminals T1 and T2 according to the generation degree of electromagnetic waves and noise.

Therefore, the user can grasp the attenuation state of the electromagnetic wave and the noise based on the number of blinks of the second light emitting diode LD2.

And, Figure 4 shows the external configuration of the auxiliary outlet with the electromagnetic wave attenuation function according to another embodiment of the present invention, the same configuration as the configuration shown in Figure 1 with the same reference numerals (symbol) and the detailed description Omit.

That is, as shown in FIG. 4, it has first and second telephone line insertion openings 4 and 5 for inserting telephone line jacks into one side of the auxiliary outlet, and jacks of the ground line LIN2. It is configured to include a grounding hole 6 for inserting (J1).

At this time, the other jack (J2) of the ground line (LIN2) is connected to a grounding terminal (not shown) such as audio to ground the auxiliary outlet, the grounding sphere 6 is coupled to the ground terminal in the auxiliary outlet Will be.

Meanwhile, the first and second telephone line insertion openings 4 and 5 are provided with a predetermined circuit for preventing lightning and eliminating line interference, which will be described later.

That is, FIG. 5 shows a circuit configuration in which the electromagnetic wave attenuation circuit shown in FIG. 1 is provided with a lightning protection and line interference elimination circuit. The same configuration as that shown in FIG. Detailed description will be omitted.

That is, in the circuit, fuses F1 and F2 are series-coupled to terminals d and e of the first telephone line insertion hole 4, respectively, and the other terminals of the fuses F1 and F2 are resistors R8 and R7. Are respectively connected in series to one terminal of the bridge circuit, and a bridge circuit composed of diodes D4, D5, D6, and D7 is connected between the other terminal of the resistor R7 and the ground terminal, and the diode D5 and the diode D4 are connected. The node is coupled to one terminal f of the second telephone line insertion opening 5, and the connection node of the diode D4 and the diode D6 is connected to the second telephone line insertion opening through the diode D2 to which the cathode is connected. Connected to the other terminal g of 5), and the connection node of the diode D5 and the diode D7 is connected to the terminal g of the second telephone line insertion opening 5 through the diode D3 to which the anode is connected. One terminal of an inductance resistor IR is connected to the connection node of the diode D4 and the diode D2, and the inductance is connected to the connection node of the diode D3 and the diode D5. The other terminal of the term IR is connected and configured.

That is, when the surge voltage is applied through the first telephone line insertion hole 4, the circuit blocks the fuse through the fuses F1 and F2, and the bridge circuits D4, D5, and D6. , D7 compensates for the loss due to the resistance of the fuses F1 and F2. The diodes D2 and D3 block reverse current, and the inductance IR stabilizes the waveform of the signal output through the second telephone line insertion hole 5 by the magnetic field effect.

Therefore, according to the circuit of the above structure, interference on the telephone line can be eliminated, and circuit damage due to lightning or the like can be prevented.

In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical spirit of the present invention.

As described above, according to the present invention, it is possible to greatly reduce the amount of unwanted electromagnetic waves and noise induced from the AC power applied in the auxiliary outlet and the electrical appliances connected thereto.

In addition, the present invention is provided with a predetermined telephone line connection port in the auxiliary outlet can remove the interference on the telephone line connected through this, it is possible to prevent circuit damage due to lightning.

Claims (8)

An auxiliary outlet having a plug (FL) for connecting to an outlet, a conductive line (LIN1) electrically connected to the plug (FL), and at least one plug insertion opening (CON) connected in parallel to the conductive line (LIN1); The filter unit 10 is configured by combining the choke coil L1 and the low pass filter in parallel to filter the electromagnetic wave and the high frequency noise generated from the AC power AC applied through the conductive line LIN1 and the electrical appliances connected thereto. )Wow, A power supply unit 20 for rectifying the AC power AC filtered by the filter unit 10 into a predetermined DC power source; The DC power applied from the power supply unit 20 is used as an operating power source, and is connected to the output terminals AC1 and AC2 of the filter unit so that the attenuation state of high frequency noise generated from the AC power source AC and the electrical appliances connected thereto is internal. An electromagnetic wave attenuation circuit including an electromagnetic wave end portion 30 displayed through the flashing operation of the first and second light emitting diodes LD1 and LD2 provided therein is electrically connected to the conductive line LIN1 and the plug insertion hole CON. Auxiliary outlet with electromagnetic wave attenuation function characterized in that connected. The method of claim 1, The electromagnetic wave attenuating circuit is electrically connected between the output terminals AC1 and AC2 of the filter unit 10 and the power input terminal V _IN of the electromagnetic wave detecting unit 30 so that the output terminals AC1 and AC2 and the electromagnetic wave detecting unit An auxiliary outlet with an electromagnetic attenuation function, characterized in that it further comprises a second switch (SW2) for selectively switching the power input terminal (V _IN ) of the (30). The method of claim 1, In the filter unit 10, the choke coil L1, the TNR, and the capacitor C1 are sequentially coupled in parallel to the AC power source AC, and the first inductor L2 is respectively connected to two terminals of the capacitor C1. ) And the second inductor L3 are connected in series, and intermediate terminals of the first inductor L2 and the second inductor L3 are short-circuited to each other, and the capacitor C2 is connected to the other terminal in parallel. An auxiliary outlet with an electromagnetic attenuation function, characterized in that. The method of claim 1, The electromagnetic wave terminal 30 has a collector terminal of transistor Q1 connected to a power input terminal V _IN , and a signal input terminal _{IN of} which is connected to a second switch SW2 through a resistor R5 and a capacitor C6. Is connected to one terminal c of the first output terminal OUT1 through the second magnetoresistive MR2 to the anode of the first light emitting diode LD1, and the second output terminal OUT2 is connected to the second light emitting diode. An oscillator 31 coupled to the anode of LD2, the resistor R6 coupled to the third and fourth output terminals T1 and T2 of the oscillator 31 connected to the capacitor C7, respectively. A node is connected to the second light emitting diode LD1, the cathodes of the first and second light emitting diodes LD1 and LD2 are respectively coupled to a ground terminal, and the second switch SW2 is connected to the capacitor C6. An auxiliary outlet having an electromagnetic damping function, characterized in that the node (R4) and capacitor (C5) coupled in parallel to the node is connected to the ground terminal. The method of claim 4, wherein The low frequency signals output from the third and fourth output terminals T1 and T2 of the oscillator 31 change the time constants of the capacitor C7 and the resistor R6, and the number of flickers of the second light emitting diode LD2 flashes. Is increased or decreased based on the voltage level signal and the low frequency signal output from the second output terminal OUT2 and the third and fourth output terminals T1 and T2 of the oscillator 31 based on the generation amount of electromagnetic waves and noise. Auxiliary outlet with electromagnetic wave attenuation function. The method according to claim 1 or 2, Circuit breaker for blocking the electrical connection between AC power supply and electromagnetic wave attenuation circuit when the circuit is overloaded and the circuit is overloaded due to series connection between AC power supply and choke coil L1. Auxiliary outlet with electromagnetic attenuation function characterized in that it is configured to include additional. An auxiliary outlet having a plug (FL) for connecting to an outlet, a conductive line (LIN1) electrically connected to the plug (FL), and at least one plug insertion opening (CON) connected in parallel to the conductive line (LIN1); The filter unit 10 is configured by combining the choke coil L1 and the low pass filter in parallel to filter the electromagnetic wave and the high frequency noise generated from the AC power AC applied through the conductive line LIN1 and the electrical appliances connected thereto. )Wow, A power supply unit 20 for rectifying the AC power AC filtered by the filter unit 10 into a predetermined DC power source; The DC power applied from the power supply unit 20 is an operating power supply, and the attenuation state of the high frequency noise generated from the AC power source AC and the electrical products connected thereto is connected to the output terminals AC1 and AC2 of the filter unit. An electromagnetic wave attenuating circuit including an electromagnetic wave end portion 30 displayed through the flashing operation of the first and second light emitting diodes LD1 and LD2 is electrically connected to the conductive line LIN1 and the plug insertion port CON. , An auxiliary outlet having an electromagnetic wave attenuation function, characterized in that a predetermined circuit is coupled to the ground end to the ground end of the electromagnetic wave attenuation circuit for interference elimination and lightning protection of the telephone line. The method of claim 7, wherein In the circuit for interference elimination and lightning protection on the telephone line, fuses F1 and F2 are respectively coupled in series to terminals d and e of the first telephone line insertion hole 4, and the other of the fuses F1 and F2 are different. The terminals are respectively coupled in series to one terminal of the resistors R8 and R7, and a bridge circuit composed of diodes D4, D5, D6 and D7 is connected between the other terminal of the resistor R7 and the ground terminal, and the diode D5. ) And the connecting node of the diode D4 are coupled to one terminal f of the second telephone line insertion hole 5, and the connecting node of the diode D4 and the diode D6 is connected to the diode D2. Is connected to the other terminal g of the second telephone line insertion hole 5 through, and the connection node of the diode D5 and the diode D7 is connected to the second telephone line insertion hole through the diode D3 to which the anode is connected. 5), one terminal of the inductance resistor IR is connected to the connection node of the diode D4 and the diode D2, and is different from the diode D3. Eau (D5) to the secondary outlet connection node with the electromagnetic wave attenuation, characterized in that the other terminal is connected is configured of the inter-capacitance resistance (IR) of the.