KR0120022B1 - Harmful wave cut-off by earth line detection - Google Patents

Abstract

A device for blocking harmful wave by detecting grounded line is provided to completely prevent harmful waves such as electromagnetic waves by detecting a grounded one of power lines. This device includes grounded line detecting part detecting a grounded one of power lines; a switching part connecting a grounded line inside of an electric/electronic apparatus to the detected grounded power line; and a control part detecting a grounded power line on receipt of the detecting part's output signal and connecting the grounded line of the apparatus to the grounded power line.

Description

Harmful wave blocking device by detecting ground wire

The present invention automatically detects the grounded power line from the power supply line (power line) when using the electrical and electronic equipment connected to the commercial AC power supply (ACV) supplied from the power company to customers such as homes, The present invention relates to a harmful wave shielding device by detecting a ground line, by connecting a ground line of a device to the detected ground line to block harmful waves emitted from the device, particularly electromagnetic waves caused by an electric field.

In addition, the present invention is to create a virtual ground point when there is no grounded power line among the power supply line (power line) when using the electrical and electronic equipment connected to the commercial AC power supply (ACV) supplied from the utility company to customers such as homes The present invention relates to a harmful wave shielding device by detecting a grounding wire which can block harmful waves emitted from the device, in particular electromagnetic waves caused by an electric field, by connecting the grounding line of the device to a grounding wire.

For example, the present invention is connected to the grounding network of the contact channel (electric mat) having an electromagnetic shielding network to the grounded power line of the power line or grounded by connecting to a virtual ground point, the blocking network is The present invention relates to a harmful wave blocking device by detecting a ground wire to ensure a substantial function of harmful wave blocking.

For another example, the present invention by connecting the computer safety glasses for shielding the electromagnetic wave to the grounded power line of the power line or grounded by connecting to a virtual ground point, the safety glasses can ensure the practical function of the harmful wave blocking The present invention relates to a harmful wave blocking device by detecting a ground wire.

Conventionally, as an example of electric power supplied from a power company to a consumer such as a home, a single-phase two-wire 110V and 220V or a single-phase three-wire 220V power supply is supplied from KEPCO to a home.

FIG. 1A is a diagram illustrating a power supply circuit for supplying a single-phase three-wire system, and shows that a single-phase three-wire 220V power supply is provided by connecting a three-wire power line of A, B, and N from a power supply unit such as a transformer.

Here, N is neutral, A and B are hot lines, and N is grounded. 220V is applied between the A-B lines, and 110V is applied between the A-N and B-N lines, respectively. FIG. 1B is a circuit in which 110V power is supplied to a consumer between A-B lines in a single-phase two-wire system, and here, B line is grounded.

Fig. 1C is a circuit in which 220V power is supplied to the customer between the A-B lines in a single-phase two-wire system, in which the B line is grounded.

In the case of FIG. 1A, if 220V power is used by the A-B line on the customer side, a power supply system in which 220V is supplied to the customer by the power line in which both the A line and the B line is not grounded. In the case of FIG. 1C, the case where the B line is not grounded is also the same as above. In the case of customers, the AB line (or AN, NB) is used to connect electric and electronic devices, and when using an electric mat or a computer (monitor), etc., a common example is to provide means for blocking electromagnetic waves. .

For example, in the case of an electric mat, a shielding network for shielding electromagnetic waves may be enclosed outside the electric heating element to configure a system that shields electromagnetic waves emitted from the heating element when the power is applied to the heating element. In this case, by attaching safety glasses to the monitor, the system can block electromagnetic waves emitted toward the front of the user from the monitor. However, in this case, the following problem occurs. In order to prevent harmful waves, the harmful waves blocking means of electric and electronic devices (the shielding network in the case of the electric mat and the safety glasses in the case of the computer monitor) must be grounded so that the harmful waves collected by the harmful wave blocking means can be grounded. Most of the harmful wave blocking means is connected to the chassis of the device.

The reason is that it is not possible to derive the wire from the harmful wave blocking means and bury it in the ground. Therefore, the harmful wave blocking means cannot be said to be grounded in a practical sense, but merely a common connection to the chassis or the like of the equipment, i.e., connected to a (-) power line or a (0) power line (ground wire inside the device).

Therefore, in such a case, it is difficult to expect that the harmful waves will be reduced sufficiently necessary to be harmless to the human body even if many decreases. A good example of grounding is to draw a separate ground wire and connect it to a faucet (water pipe), as in the case of a washing machine. It is very difficult and cumbersome to install the above-mentioned electric mat or safety glasses of a computer monitor. This can not be.

Therefore, even if almost all consumers use electrical and electronic devices having harmful wave blocking means, the problem is that the harmful wave blocking means does not function in a practical sense.

On the other hand, if the plug-outlet is connected to connect the internal ground wire of the electric and electronic device having the harmful wave blocking means to a grounded power line among the power line A or the power line B, the above problem can be solved.

That is, if the plug-outlet of the electric and electronic device is connected in consideration of the 'electrode' so that the ground line inside the device is connected to the grounded power line B of FIGS. 1B and 1C, the grounded power line B is connected. Through the harmful wave blocking means is grounded (Ground) can be solved the problem. However, if the user plugs electrical or electronic equipment into the outlet, it is virtually impossible to connect the grounding wires inside the equipment to grounded power lines B and N.

The reason is that users of commercial customers using commercial AC power not only understand the electrode characteristics of the plugs, but the AC power plugs can be plugged into and pulled out of the outlet freely without having to consider the 'electrode' at all. This is because these considerations are not made at all.

On the other hand, as mentioned earlier, if there is no ground wire among the power lines fed from KEPCO to the customer, for example, in the position of the customer receiving 220V power to the AB line in FIG. You don't even need to consider.

Therefore, in this case, the above problem appears that the practical effect of the blocking of harmful waves cannot be expected.

The present invention provides a harmful wave blocking device by detecting a ground line that solves the above-mentioned conventional problems. According to the present invention, there is provided a means for detecting the presence of a grounded power line and which power line is the grounded power line among the power supply lines of the commercial AC power supplied to the customer, and the grounded power source inside the device according to the detection result. By having a means for connecting to a wire, the conventional problem is solved, and a harmful wave shielding device by detecting a ground line is provided so that the harmful wave blocking means of electrical and electronic devices having a harmful wave blocking means can perform a substantial grounding action.

The present invention provides a means for detecting the presence or absence of a grounded power supply line and an old grounded power supply line from among power supply lines of commercial AC power supplied to a consumer, and a zero voltage at a terminal of the power supply line. And a means for detecting and creating a virtual ground point (ground power source) and a means for connecting a ground line inside the device to the grounded power line power line or a virtual ground point according to the ground line detection result, thereby solving the conventional problems. In addition, a harmful wave blocking device is provided by a ground wire detection device that enables a harmful wave blocking means of an electric or electronic device having a harmful wave blocking means to perform a substantial grounding action.

According to the present invention, when a user inserts a plug of an electrical or electronic device into an outlet, the grounding wire inside the device is grounded according to a result of detecting the presence or absence of a grounded power line and which power line is grounded. By means of automatic connection to power line or virtual grounding point, harmful wave shielding device by grounding wire detection that allows users to ground the internal grounding wire correctly even if the user plugs electrical or electronic equipment into the outlet in any direction. To provide.

1A is a diagram showing a single-phase three-wire feed circuit.

Figure 1b is a diagram showing a short two-wire 100V power supply circuit.

Figure 1c is a diagram showing a single-phase two-wire 220V power supply circuit.

2 is a circuit diagram of a harmful wave blocking device by detecting the ground line of the present invention.

3 is an operation flowchart of the harmful wave blocking device by detecting the ground line of the present invention.

Harmful wave blocking device by the ground line detection of the present invention for achieving the above object and having the above characteristics; Ground line detecting means for detecting the presence or absence of a grounded power line and whether any power line is grounded among the power lines supplied to the customer; Switching means for connecting a ground line inside an electrical and electronic device to the detected ground power line; And a control means for receiving a detection signal of the ground line detecting means to determine a ground power line, and in response to the determination result, the switching means to connect the ground line inside the device to the detected ground power line. This is a harmful wave blocking device by detecting ground wire.

In the harmful wave shielding device according to the grounding line detection of the present invention, the grounding line detecting means comprises a virtual grounding line and each powering line A as shown in FIG. 1B or 1C. Depending on whether or not the power supply difference between, B) is detected using the operation of the optical coupler. The switching means of the present invention connects the ground wire and the power line (A) or the power line (B) inside the device by using a switching element that connects or boils the ground wire inside the device and the two power lines (A, B). do.

The control means of the present invention determines which of the two power supply lines (A, B) is the power supply line grounded according to the state (high level or low level) of the signal detected by the ground line detection means, and the determination result Accordingly, the switching means may connect the ground line and the power line (A) in the device or the ground line and the power line (B) in the device.

Hereinafter, with reference to the accompanying drawings will be described a harmful wave blocking device according to the ground line detection of the present invention by an embodiment of the present invention.

FIG. 2 shows a circuit configuration of a device for automatically connecting an internal ground line of a device to a detected ground line according to a ground line detection result as an embodiment of the harmful wave shielding device according to the ground line detection of the present invention.

Referring to Figure 2, the harmful wave shielding device by the ground line detection of the present invention; as a ground line detection means; of the (-) side of the DC power supply unit and the input power line (A, B) through the insulation transformer so as not to be affected by the input power; A first ground line detection unit 1 for detecting whether the power supply line A is grounded, and a second ground line detection unit 2 for detecting whether the power supply line B is grounded; As said switching means; A first switching unit 5 connecting the harmful wave blocking network 8 and the power supply line A as a ground wire of the device 100 having a heating fan 12 and a regulator 11 as a contact receiver; A second switching unit 6 connecting the blocking network 8 and the power line B; As the control means, the detection result of the first ground line detecting unit 1 and the second ground line detecting unit 2 is input, and the ground power line is discriminated according to the high or low level of the two input signals, and according to the determination result. The control unit 3 is configured to control the first switching unit 5 or the second switching unit 6 on / off.

In addition, in this embodiment, in order to ground the harmful wave shielding network 8 in the case of the single-phase three-wire system in which both the power lines A and B are not grounded; Connect the zero voltage detection unit 4 connected between the power lines A and B to make a zero potential, the zero point N of the zero voltage detection unit 4, and the harmful wave blocking network 8. The third switching unit 7 is further included. When both power lines A and B are not grounded, the control unit 3 controls the third switching unit 7 to the zero point N. It is characterized by connecting the harmful wave screen (8).

On the other hand, in this embodiment, the first ground line detection unit 1; A protective resistor (R1), neon lamp (L1), and photoconductor that can determine whether the ground is between the power supply line (A) of the input power supply lines (A, B) and the negative potential (VGW) of the ground discrimination circuit. An element 1a, and the second ground line detecting section 2 is formed of a device; A protective resistor (R2), neon lamp (L2), and photoconductor that can determine whether the ground is between the power supply line (B) of the input power supply lines (A, B) and the negative potential (VGW) of the ground discrimination circuit. An element 2a, wherein the zero voltage detector 4; If the input power line (A, B) is not a single-phase two-wire type with one ground, and both input power lines (A, B) are single-phase three-wire type without a ground line (NUTRAL), the power line (A, B) It consists of series connection resistors (R3, R4) and parallel connection capacitors (C1, C2) of the same magnitude, which divide the voltage to create an intermediate potential to generate a 0V ground potential.

In FIG. 2, reference numerals R5 and R6 denote resistors.

Referring to the flowchart of FIG. 3, the ground line detection and the ground line connection control operation by the harmful wave blocking device according to the present invention, the ground line detection of FIG. 2 configured as described above will be described.

Plug the appliance into the condenser and commercial AC power is supplied via the power lines A and B.

First, the case where the power supply line B is grounded as shown in FIG. 1B or 1C will be described.

In the case of supplying 110V power to the A-N or N-A line in FIG. 1A, the same is also the case when the N line is grounded.

Since the power supply line A is not grounded (it is a hot line), the photoconductive element 1a facing the lamp L1 of the first ground line detection unit 1 decreases in internal resistance (or increases in element number). It is possible).

Since the power supply line B is grounded, the lamp L2 of the second ground line detecting unit 2 is turned off, and the photoconductive element 2a facing the lamp L2 increases (or decreases) its internal resistance value. Element is also possible).

The operation of the detection unit in this way is performed by the resistors R1 and R2 and the neon lamps L1 and L2 having the same magnitude of resistance connected between the power supply lines A and B of the input power supply ACV. Divide the voltage between lines A and B to connect the midpoint of its potential to the negative side (VGW) of the circuit of the present invention and to the breakdown network 8 (the breaking network is grounded) of the VGW and the mat. This is because the potential of the cutoff network becomes the ground potential and the potential of the VGW also becomes the 0V ground potential.

This principle is also applied to the zero voltage detector 4, and the zero point (') for the single-phase three-wire type is applied to the middle point (N) of the series / parallel connection circuits of the same size of the resistors R3 and R4 and the capacitors C1 and C2. 0 ') point voltage is detected.

As described above, the potential difference across the warp resistors R2 to L2 where the power supply line B is grounded becomes '0' so that the lamp L2 is turned off and is input to the resistors R1 to L1. The lamp L1 is turned on by the electric current flowing by the power supply ACV, and the photoconductive element 1a senses the ON of the lamp L1 and the ground line B having a predetermined level at the input terminal IN1 of the controller 3. ) The detection signal is inputted (the first ground line detecting unit 1 detects whether the power supply line A is a hot line or a ground line).

When the power supply line A is grounded and the other power supply line B is not grounded, the lamp L1 is turned off and the lamp L2 is turned on so that a ground wire having a predetermined level at the input terminal IN2 of the control unit 3 ( A) Input the detection signal.

When the power lines A and B are not grounded, that is, in the case of the A-B 'line 220V power supply circuit in FIG. 1A, the lamps L1 and L2 are turned on so that the photoconductive elements 1a and 2a are turned on. The detection signal is input to the input terminals IN1 and IN2 of the controller 3.

Therefore, the controller 3 can determine whether the power line is grounded and which power line is grounded according to the signals of the input terminals IN1 and IN2.

A description with reference to FIGS. 2 and 3 is as follows.

The control part 3 turns on the 1st switching part 5 or the 2nd switching part 5, the 2nd switching part 6, or the 3rd switching part 7 according to a determination result.

The control unit 3 outputs a control signal to the first switching unit 5 at the output terminal P1 when the power line A is grounded (output of the sensor 2a).

For example, a signal of 'high' level is output, and the first switching unit 5 becomes temperature by this control signal.

Therefore, when the harmful wave blocking network 8 is grounded through the first switching unit 5 (output of the sensor 1a), a control signal is output from the output terminal P3 to the second switching unit 6.

For example, a high level signal is output, and the second switching unit 6 is turned on by the control signal.

Therefore, the harmful wave blocking network 8 is connected to the grounded power supply line B through the second switching unit 6, whereby the harmful wave blocking network 8, which is the grounding wire inside the device 100, is grounded. .

The control unit 3 outputs a control signal to the third switching unit 7 from the output terminal P2 when the ground line determination results in that the power lines A and B are not all grounded.

For example, a signal of a 'high' level is output, and the third switching unit 7 is turned on by the control signal.

Therefore, the harmful wave blocking network 8 is connected to the zero voltage detection terminal (N = '0' potential) of the zero voltage detection unit 4 through the third switching unit 7, and thereby the inside of the device 100. The harmful wave blocking network 8, which is a ground wire, is grounded.

As described above, the harmful wave shielding device by detecting the ground line of the present invention automatically detects a grounded power line and connects the grounded power line to a ground wire inside the device such as a harmful wave shielding network or safety glasses, thereby preventing from harmful electromagnetic waves. Can protect the human body.

The harmful wave blocking device by detecting the ground line of the present invention detects a grounded power line among the power lines and connects the ground line inside the device to the detected ground line, thereby completely blocking (grounding) the harmful waves.

Also, if there is no grounded power line among the power lines, a virtual ground point (N) is created and the grounding line inside the equipment is connected to the grounding point (N), so that harmful waves are completely cut off even in a power supply system without a grounded power line. (Grounding).

In addition, since the grounding wire detection and the connection of the grounding wire inside the device can be performed automatically, it is convenient because the use of the device does not require consideration or attention to the 'electrode' of the plug.

That is, in the case of single-phase three-wire type without the ground potential (N; neutral) in the commercial power supply without a separate ground wire, the virtual ground potential is made by dividing the voltage with a resistor of the same size.

Claims (4)

Ground line detecting means for detecting the presence or absence of a grounded power line and which power line is a grounded power line among the power lines supplied to the customer; Switching means for connecting a ground wire inside an electric and electronic device to the detected ground power line; receiving a detection signal of the ground line detecting means to determine a ground power line, and causing the switching means to correspond to the determination result. Harmful wave blocking device by detecting the ground line, comprising a control means for connecting the ground line inside the device to the detected ground power line. The harmful wave shielding device according to claim 1, wherein the control means automatically turns on and off each switch means according to the ground line detection result, thereby grounding the ground wire inside the apparatus. The hysteresis power line according to claim 1 or 2, wherein the grounding line detected by the grounding line detecting means detects a grounding power line in order to ground the grounding line inside the device by a switching operation of the switching means when there is no grounded powering line. A harmful wave blocking device by detecting the ground line further comprising a zero voltage detection means for generating a zero voltage. 4. The apparatus of claim 3, further comprising: ground wire detecting means; A first ground line detection unit 1 for detecting whether the power line A is grounded among the input power lines A and B, and a second ground line detection unit 2 for detecting whether the power line B is grounded; In the case of single-phase three-wire type in which both wires A and B are not grounded, a grounding terminal connected to the power supply lines A and B to make a zero potential is grounded to ground the harmful wave blocking network 8. A voltage detector 4; As said switching means; A first switching unit 5 connecting the harmful wave blocking network 8 and the power supply line A as a ground wire of the device 100 having a heating element 12 and a regulator 11 as a contact channel, and blocking the harmful wave A second switching unit 6 connecting the network 8 and the power line B, and a third switching unit connecting the zero point N of the harmful wave blocking network 8 and the zero voltage detection unit 4 7); As said control means; Based on the detection result of the first ground line detecting unit 1 and the second ground line detecting unit 2, the ground power line discrimination is performed according to the high or low level of the two input signals, and the first switching unit according to the determination result. (5) Or the harmful wave shielding device by detecting the ground wire composed of a control unit (3) for controlling the on / off control of the second switching unit (6) or the third switching unit (7).