JP2003339154A - Device for suppressing jamming caused by electromagnetic waves - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for suppressing the jamming caused by electromagnetic waves, which can effectively suppress unwanted jammings by electromagnetic waves, without needing anew wiring such as a grounding conductor, etc., in an electric/electronic apparatus using a single-phase two-line system of AC power source. <P>SOLUTION: This device, which suppresses unwanted electromagnetic waves from being generated in the electric/electronic apparatus operation, being connected to a general commercial power source in an office, a home, or the like, has a polarity-determining means, which automatically determines the neutral wire (neutral side) at the grounding potential in the single-phase power source of the commercial power source and the live wire (hot side) of an active part and a grounding point connection means, which connects by a capacitor and a resistor, the neutral wire of the single-phase power source determined by the polarity determining means with the conductive part or the conductive casing on the ground side of the electric/electronic apparatus operating, being connected to the single-phase power source. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave interference suppressing device for suppressing unnecessary electromagnetic waves generated from electric / electronic devices which are connected to a general commercial power source and operate in offices, homes and the like.

[0002]

2. Description of the Related Art A single-phase, two-wire type AC 100V power source generally used in Japan uses a transmission line to generate a high voltage (6,600V).
Etc.) is supplied to offices and ordinary households as a 200V power supply of single-phase three-wire system including ground potential by a pole transformer or indoor / outdoor transformer equipment. The power supply is a two-phase single-phase two-wire power supply,
The products are supplied to electric appliances such as televisions, audio equipment, washing machines, refrigerators, microwave ovens, air conditioners, home appliances, various office automation equipment, and lighting equipment.

One of the single-phase, two-wire type AC power supplies is grounded in the substation as a neutral wire (neutral side), and the other is an active wire (hot side) of AC100V. One of the outlets is a neutral wire (neutral side) and has a long polarity with the insertion port.

However, the polarity of some old power distribution facilities and commercially available outlets are not clear, and the polarity may not always be protected in the power supply connection of equipment. For this reason, AVs connected without matching the polarities
There are problems that viewers such as (Audio Visual) devices suffer from noise, and in extreme cases, various connected electric and electronic devices malfunction.

In addition, since the polarity of the above-mentioned outlet is unclear, it is necessary to electrically insulate the power supply between the primary side of AC100V and the secondary side of the electric / electronic equipment, and grounding for safety ground is required. In case of needing, or in case of shielding the housing of the electric / electronic device so as to prevent unnecessary electromagnetic wave suppression or malfunction, it is necessary to separately provide wiring for grounding.

[0006]

In order to solve the above problems, the present invention does not require wiring such as a new grounding wire even in electric / electronic equipment using a single-phase two-wire type AC power supply. It is an object of the present invention to provide an electromagnetic wave interference suppressing device that can effectively suppress unnecessary electromagnetic wave interference.

[0007]

In order to achieve the above object, the invention according to claim 1 is a device for suppressing unnecessary electromagnetic waves generated from electric and electronic equipment which is connected to a general commercial power source and operates. A polarity discriminating means for automatically discriminating between the ground potential neutral line (neutral side) and the active line active line (hot side) of the single-phase power source of the commercial power source;
The neutral wire (neutral side) of the single-phase power supply determined by the polarity determination means and the ground-side conductive portion or conductive housing of the electric / electronic device which is connected to the single-phase power supply and operates, are provided with a capacitor and a resistor. And a grounding point connecting means connected with a power source, an input power source plug, and an output power source outlet, and the polarity discriminating means is a DC power source circuit for its operation and an alternating magnetic field or an alternating current depending on an alternating current. An electromagnetic field detection circuit that detects an electric field, a detection circuit of the detected electromagnetic field component, and a polarity determination circuit that determines the polarity based on the detected and detected electromagnetic field component, the contact connection means,
It is characterized by comprising a relay control circuit for connecting the neutral wire (neutral side) whose polarity is determined to the ground point, a contact connection circuit and a relay.

According to a second aspect of the present invention, there is provided a device for suppressing electromagnetic interference, wherein the input power plug is a two-pole input power plug for receiving a single-phase 100V AC power from a general commercial power supply. The output power outlet is provided with one plug insertion port connected to the neutral wire (neutral side) of the single-phase power source determined by the polarity determination means, and for the power source of the electric / electronic device to be used. This is a three-pole output power outlet consisting of two plug insertion ports, and for connecting the conductive case of the electric / electronic device and the neutral wire (neutral side) of the single-phase power source. It is characterized by being equipped with a plug insertion port.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a specific example of an embodiment of an electromagnetic wave interference suppressing device according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the supply of a general AC 100V power source. FIG. 1A shows a high-voltage line (6, 6) on the primary side.
00V, etc.) is used to extract a single-phase 3-wire 200V AC power source using a transformer and supply it to a general household or office as a general commercial power source. Two systems are provided by a distribution board installed in the general household or office. In this case, a single-phase 100V AC power source is supplied. In the case of single-phase three-wire power supply, two active wires (hot side) 180 degrees out of phase as the secondary power source and a neutral wire (grounded to earth ground where the transformer is installed ( Neutral side) and. AC100V between neutral wire and each active wire
Since the two active lines have AC200V, the AC200V is used in an air conditioner having a large cooling capacity, hot water supply equipment by night power, an electromagnetic cooker, and the like. FIG. 1B shows a case of supplying single-phase two-wire AC100V, which has not been used much for general household use recently. In the case of AC100V of single-phase two-wire system, where the transformer is installed, one is grounded to the earth ground, and this is composed of the grounded neutral wire (neutral side) and the other active wire (hot side). Has been done.

FIG. 2 is a schematic view showing the shape of a commonly used power outlet. FIG. 2 (a) shows a case of a three-pole power outlet equipped with a grounding terminal, the middle one of which is a grounding terminal, and the longer one of the two is a neutral wire and the shorter one. Is for actinic radiation. This is used when the ground line is wired together with the power supply line. FIG. 2B shows the shape of a two-pole power outlet in which the neutral wire side and the active wire side are distinguished, and the longer one of the two outlets is for the neutral wire and the shorter one is for the active wire. Is. Figure 2 (c) shows
Although it is a two-pole power outlet similar to that shown in FIG. 2B, the polarities of the neutral wire and the active wire cannot be distinguished because the insertion ports have the same length. In recent years, installed outlets such as walls are becoming more and more polarized, but in reality, simple type plugs and outlets such as table taps and outlets often have no distinction of polarity. A method for solving the problem caused by such a background will be described.

FIG. 3 is a block diagram showing the configuration of the electromagnetic wave interference suppressing device according to the present embodiment. The electromagnetic wave interference suppressing device 1 of the present invention includes a polarity determining unit that automatically determines a neutral line (neutral side) of a ground potential in a single-phase power source of a commercial power source and an active line (hot side) of a live part. The neutral wire (neutral side) of the single-phase power supply determined by the polarity determination means and the ground-side conductive portion or conductive housing of the electric / electronic device which is connected to the single-phase power supply and operates, are provided with a capacitor and a resistor. It is equipped with a grounding point connecting means connected with a power source, an input power source plug P1, and an output power source outlet 18, and the polarity discriminating means alternates with a direct current power source circuit 15 for its operation and an alternating current. A high resistor R1 for generating a magnetic field or an alternating electric field and an alternating electromagnetic field having a loop-shaped or dipole-shaped antenna circuit pattern for detecting the generated alternating magnetic field or the alternating electric field. A detection circuit 11, the detected electromagnetic field component detecting circuit 1
2 and a polarity discriminating circuit 13 for discriminating the polarity based on the detected / detected electromagnetic field component, and the contact connecting means is a relay for connecting the neutral line (neutral side) whose polarity has been discriminated to the ground point. It is composed of a control circuit 14, a contact connection circuit 17, and a relay 16.

Next, the operation will be described. The electromagnetic interference suppression device 1 is supplied with a single-phase AC100V power from a general commercial power supply via a two-pole input power plug P1 and is connected to the terminals AC1 and AC2 of the relay 16. After initializing with a reset switch (not shown),
According to a predetermined sequence, one of the two terminals of the relay 16 by the relay control circuit 14, for example, the terminal AC1
, And the neutral line (neutral side) or active line (hot side) of the ground potential of the general commercial power source is connected to the secondary side GND (ground) via the high resistor R1. An alternating electromagnetic field is generated by the current flowing through the high resistor R1, and the alternating electromagnetic field component is detected by the electromagnetic field detecting circuit 11 inside the electromagnetic wave interference suppressing device 1.

As a method of discriminating the polarity of the power supply line, a method of measuring a change in an electric field, a magnetic field, a GND current or the like can be considered. In the present embodiment, a loop-shaped or dipole-shaped circuit pattern formed on a printed circuit board is used. Is used as an antenna, the strength of the alternating magnetic field or the strength of the alternating electric field generated inside is measured, and is input to the polarity determination circuit 13 via the detection circuit 12.

Next, via the relay control circuit 14, the relay 16 is automatically connected to a terminal AC2 which is different from the one to which the relay 16 is connected first, and similarly to the case where the relay 16 is connected to the terminal AC1, the strength of the alternating electromagnetic field or the alternating field. The strength of the electric field is measured and the detection circuit 1
It is input to the polarity determination circuit 13 via 2.

In the polarity discriminating circuit 13, these terminals AC
By comparing the measured values when connected to terminal 1 and when connected to terminal AC2, the one showing a higher measured value of the alternating magnetic field strength or the alternating electric field strength is discriminated as the active line (hot side), and the measured value is lower. Indicates the neutral line (neutral side)
To determine.

Further, since it is possible to discriminate the active line (hot side) by detecting an alternating electromagnetic field having a level exceeding a predetermined threshold value, in this case, the active line side and the active line side are detected at the time of detection. The sex line (neutral side) can be discriminated.

Based on the discrimination result by the detection in the alternating electromagnetic field,
The relay 16 is automatically connected to the terminal determined to be on the neutral wire side via the relay control circuit 14, and is generally connected via the ground point connection circuit 17 including the relay 117, the capacitor C and the resistor R shown in FIG. The neutral wire side of the commercial power source and the ground terminal CN1 in the three-pole output power outlet 18 provided for supplying power to the external connection device 2 and the ground terminal CN2 provided for external device are automatically Connect to.

A power plug P of an electric / electronic device 2 externally connected to an output power outlet 18 of the electromagnetic interference suppressing device 1.
2 is connected to supply power. When the power plug P2 of the externally connected electric / electronic device 2 has three poles, the ground-side conductive portion or conductive housing of the externally connected electric / electronic device is connected via the ground terminal CN1 in the output power outlet 18 Connected to the neutral line side of general commercial power supply. Power plug P2 is 2
In the case of a pole, by electrically connecting the terminal C2 connected to the ground-side conductive portion of the electric / electronic device 2 or the conductive housing to the ground terminal CN2 provided in the electromagnetic interference suppression device 1, -The grounded side conductive part or housing of the electronic device 2 is connected to the neutral line side of the general commercial power supply.

By the above-mentioned connection, electricity / external connection
The electric charge accumulated in the ground-side conductive part, the conductive housing, or the shield case that is excited by the unwanted electromagnetic waves generated in the electronic device 2 can be discharged to the neutral line side of the ground potential of the general commercial power supply, and Since the ground potential of the electronic device 2 can be made common, it is possible to suppress electromagnetic waves emitted from the conductive portion, the conductive housing, the shield case, or the like in the electric / electronic device 2.

FIG. 5 shows the appearance of the electromagnetic wave interference suppressing device 1. FIG. 5 (a) is a plan view of the surface of the input power plug P1 equipped, and FIG. 5 (b) is for connecting the conductive case of the electric / electronic device to the neutral wire (neutral side) of the single-phase power supply. FIG. 5C is a plan view of the equipment surface of the output power outlet 18 and FIG. 5C is a side view of the equipment surface of the plug insertion port CN2.

The input power plug P1 is a two-pole input power plug for receiving a single-phase 100 V AC power from a general commercial power supply, and the output power outlet 18 is the single power plug judged by the polarity judging means. Three-pole output power supply consisting of one plug inlet connected to the neutral wire (neutral side) of the phase power source and two plug inlets for the power supply of the electric / electronic equipment to be used It is an outlet. In addition, a plug insertion port for connecting the conductive case of the electric / electronic device and the neutral wire (neutral side) of the single-phase power supply is provided. The input power plug P1 connects to a general commercial power outlet, and the output power outlet 18 supplies power to the externally connected electric / electronic device 2.
In addition, the power plug P2 of the electric / electronic device 2 to be externally connected
In the case of 2 poles, the terminal connected to the conductive part or the conductive housing on the ground side of the electric / electronic device 2 is connected to the ground terminal plug insertion port CN2 provided in the electromagnetic interference suppression device 1.
By electrically connecting to the above, the ground-side conductive portion or housing of the electric / electronic device 2 is connected to the neutral line (neutral side) of the general commercial power source.

[0022]

As described above, according to the present invention, it is possible to save the trouble of separately arranging a ground wire in connecting electric / electronic devices, and to effectively eliminate the ground wire even if the ground wire cannot be wired. It is also effective for safety and hygiene because it can suppress electromagnetic interference waves and prevent malfunction of surrounding electric and electronic devices as well as reduce health effects.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing supply of a general AC 100V power source.

FIG. 2 is a schematic view showing the shape of a commonly used power outlet.

FIG. 3 is a block diagram showing a configuration of an electromagnetic interference suppression device according to an exemplary embodiment of the present invention.

FIG. 4 is a circuit diagram of a ground point connection portion of the electromagnetic interference suppression device shown in FIG.

FIG. 5 is an external view showing an example of the electromagnetic wave interference suppression device of the present invention.

[Explanation of symbols]

1 Electromagnetic interference suppression device 2 Externally connected electrical and electronic equipment 11 Electromagnetic field detection circuit 12 Detection circuit 13 Polarity discrimination circuit 14 Relay control circuit 15 DC power supply circuit 16,117 relay 17 Ground connection circuit Power outlet for 18 outputs 19 reset switch L1 standby display lamp L2 operation indicator lamp Input power plug for P1 electromagnetic interference suppression device P2 Power plug for external device connection R, R1 resistor C capacitor AC1, AC2 Power line polarity discrimination terminal CN1, CN2 ground terminal

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tatsuya Endo             Fukushima Prefecture Sukagawa-shi Oji Morisuku character fox stone 121-44 (72) Inventor Noriyuki Takahashi             6-11 Momomidai, Koriyama City, Fukushima Prefecture (72) Inventor Masatake Otake             2-5-10 Nagakubo, Azumi Town, Koriyama City, Fukushima Prefecture F-term (reference) 5H740 AA08 NN01 NN05

Claims (2)

[Claims] 1. A device for suppressing unnecessary electromagnetic waves generated from an electric / electronic device that is connected to a general commercial power source and operates, wherein a neutral potential (neutral side) of a ground potential in a single-phase power source of the commercial power source. And a polarity discriminating means for automatically discriminating between the active line (hot side) of the live part and a neutral line (neutral side) of the single-phase power source discriminated by the polarity discriminating means and the single-phase power source. A grounding point connecting means for connecting a conductive part or a conductive housing on the ground side of an electric / electronic device that operates by a capacitor and a resistor, and an input power plug,
An output power outlet is provided, and the polarity determination means is a DC power supply circuit for its operation, an electromagnetic field detection circuit for detecting an alternating magnetic field or an alternating electric field by an alternating current, and a detected electromagnetic field component. It is composed of a detection circuit and a polarity discriminating circuit which discriminates the polarity based on the detected / detected electromagnetic field component. The contact connecting means is a relay for connecting the neutral line (neutral side) whose polarity has been discriminated to a ground point. An electromagnetic wave interference suppression device comprising a control circuit, a contact connection circuit, and a relay. 2. The input power plug is a two-pole input power plug for receiving a single-phase 100V AC power from a general commercial power supply, and the output power outlet is discriminated by the polarity discriminating means. 3-pole output consisting of one plug inlet connected to the neutral wire (neutral side) of the single-phase power source and two plug outlets for the power source of the electric / electronic equipment to be used Is a power outlet for use, and is equipped with a plug insertion port for connecting the conductive case of the electric / electronic device and the neutral wire (neutral side) of the single-phase power supply. The electromagnetic interference suppression device according to claim 1.