KR19980078339A - Electronic device grounding device - Google Patents

Abstract

The present invention relates to a variety of electronic devices, such as a washing machine, a refrigerator, a microwave oven, a computer, an electric blanket, an electric blanket, an inverter stand, a hair dryer, etc. having a ground terminal to block external emission of electromagnetic waves and leakage current. The present invention relates to a grounding device for connecting a ground terminal to a ground wire of an AC power source, a building ground point, or a virtual ground point artificially provided. Specifically, the ground terminal is connected between both ends of the AC power source and a building ground point connected to the ground. A building ground detection unit for outputting a signal according to whether the earth is grounded or not; A virtual grounding part connected to both ends of the AC power supply and dividing the size of the AC power supply; A switch switching unit for switching between both ends of the AC power source, a building ground point, and a virtual ground point in a predetermined method; A signal transmission unit connected to the signal output terminal of the switch switching unit and converting and rectifying the magnitude of the signal applied through the switch switching unit; A comparison unit for comparing a signal applied from the signal transmission unit with a predetermined reference value and outputting a signal indicating whether a terminal connected by the switch switching unit is a ground potential; A display unit connected to the signal output terminal of the comparison unit and indicating whether the terminal connected by the switch switching unit is a ground potential; A circuit power supply unit for supplying an independent direct current power source separated from the AC power source to the comparison unit and the display unit; It is made of a conductive material and is connected to the zero potential point of the circuit power supply unit, and when the human body or the earth ground terminal is contacted, the zero potential point of the circuit power supply unit is connected to the human body or the earth ground terminal. A ground discrimination terminal connected to the ground; An electronic device grounding apparatus comprising an electronic device ground terminal connected to the signal output terminal of the switch switching unit and the signal input terminal of the signal transmission unit and connected to a ground terminal of the electronic device.

The present invention, because the presence of the grounding line of the power line, whether the grounding of the building and the virtual grounding terminal needs and whether the grounding through the visual display device and the audio display device to the user through, so that the grounding terminal of the electronic device is accurate and easy Of course, there is an effect that can be grounded as well, due to the simplicity of the circuit can reduce the production cost, there is an effect that can prevent the malfunction.

Description

Electronic device grounding device

The present invention relates to a variety of electronic devices, such as a washing machine, a refrigerator, a microwave oven, a computer, an electric blanket, an electric blanket, an inverter stand, a hair dryer, etc. having a ground terminal to block external emission of electromagnetic waves and leakage current. The grounding device for connecting the ground terminal to a ground line (cold line) of AC power, a building ground point, or an artificial ground point (IMAGINARY GROUND POINT) artificially prepared. The visual display device and the audio display device allow the user to know whether or not the ground is necessary and the virtual ground terminal, so that the electric device can be easily grounded. It is an improvement of 7734.

As is well known, various electronic devices inevitably generate electromagnetic waves by the operation of their internal circuits, and the generated electromagnetic waves affect other electronic devices through power lines or airwaves, causing noise and malfunction. there was. In addition, when the electronic device is an electric blanket, an electric blanket, a hair dryer, etc. used in close proximity to the human body, the electromagnetic waves generated from the electric appliances adversely affect the human body, causing various dermatitis, headaches, chronic fatigue, stroke, and hair damage. There was a problem such as causing. In addition, in electronic devices such as a washing machine and a refrigerator, there is a problem that an electric shock accident is caused by a leakage current.

Therefore, in Korean Utility Model Registration Application No. 7734, “Earth Device for Electrical Equipment,” which is a predecessor of the applicant, if a grounded power line exists by discriminating a grounded power line through a neon lamp among two applied power lines. In this case, a grounding terminal was automatically connected to the grounded power line, and otherwise, the grounding terminal was connected to a virtual ground point arbitrarily provided.

However, in the above-described prior application of the present inventors, the operation is automatically performed so that the circuit becomes complicated and the production cost increases, and there is a problem that a malfunction occurs due to a complicated circuit configuration.

In addition, in the design of the above-described application, there is a problem that can not be used if there is a building ground line, and it is not possible to determine whether or not the ground of the building ground line, there is a problem that the operation is easily recognized through the visual display device and the auditory display device. There was a problem that can not be done.

In addition, in the above-described prior application, since a general transformer is used as a voltage conversion device for providing a circuit operation power source, there is a problem in that a potential of the power source is induced through the transformer and a malfunction occurs in determining the ground line. In other words, the voltage supplied through the transformer becomes the intended voltage to operate the circuit. However, when the zero potential of the circuit is regarded as the potential of the earth ground point, the zero potential of the circuit operating voltage is caused by the induced power supply potential. Is a potential of the power source, causing a malfunction in determining the ground line.

An object of the present invention is to solve the above-mentioned conventional problems, and in particular, by using the operating power of the circuit as an independent power supply (for example, a battery), or a voltage conversion device using a double insulated transformer, In addition to separating the circuit from the power supply, the presence of the grounding wire of the power line, the grounding of the building, and the necessity of the virtual grounding terminal are notified to the user through the visual display device and the audio display device. To provide an "electronic device grounding device" that can be grounded.

In order to achieve the above object, the present invention "electronic device grounding device" is connected between both ends of an AC power supply and a building ground point connected to a ground, and outputs a signal according to whether or not the grounding point of the ground is grounded. A building ground detection unit; A virtual grounding part connected to both ends of the AC power supply and dividing the size of the AC power supply; A switch switching unit for switching between the both ends of the AC power source, the building ground point, and the virtual ground point in a predetermined method; A signal transmission unit connected to the signal output terminal of the switch switching unit for converting and rectifying the magnitude of the signal applied through the switch switching unit; A comparison section for comparing a signal applied from the signal transmission section with a predetermined reference value and outputting a signal indicating whether the terminal connected by the switch switching section is the ground potential; A display section connected to the signal output terminal of the comparison section for displaying whether the terminal connected by the switch switching section is a ground potential; A circuit power supply unit for supplying an independent direct current power source separated from the AC power source to the comparison unit and the display unit; A ground discriminating terminal made of a conductive material and connected to the zero potential point of the circuit power supply unit and connecting the zero potential point of the circuit power supply unit to the earth through the human body or the earth ground terminal ; The technical configuration is characterized in that it comprises an electronic device ground terminal which is commonly connected between the signal output terminal of the switch switching unit and the signal input terminal of the signal cutting unit to connect the ground terminal of the electronic device.

The building ground detection unit may be configured by connecting two resistors having different sizes in series with both ends of an AC power source, and then connecting the building ground points to the common connection points of the resistors.

Preferably, the two resistors have a resistance value high enough to protect the human body from an AC power source.

The virtual grounding unit may be configured by connecting two resistors having the same size in series to both ends of an AC power supply, and then setting the common connection point of the resistors as a virtual grounding point.

In addition, the switch switching unit is characterized in that it is composed of a manually operated multi-contact switching switch.

The manually operated multi-contact switch is characterized in that the handle is coated with a conductive material, and then connected to the zero potential point of the circuit power supply unit to be used as a ground discrimination terminal.

In addition, the switch switching unit is configured to detect the output signal of the comparison unit, it is configured to automatically switch sequentially until the connected terminal becomes a signal indicating the ground potential.

In addition, the signal transmission unit is characterized in that it is composed of a half-wave rectifier circuit for half-wave rectifying the signal applied through the switch switching unit.

The signal transfer unit may be configured as a double voltage rectifier circuit for rectifying the voltage applied through the switch switching unit.

The comparator may be configured to divide the voltage applied from the circuit power supply unit by a predetermined method as a reference potential, and compare the values of the two by using the signal applied from the signal transfer unit as a comparison potential. do.

The comparison unit may be configured to compare the reference potential and the comparison potential by connecting a plurality of comparators in series or in parallel.

The display unit may further include: a visual display device connected between the positive potential of the circuit power supply unit and the signal output terminal of the comparison unit to emit light when the terminal connected by the switch switching unit does not have a ground potential; And an audible display device connected between the positive potential of the circuit power supply unit and the signal output terminal of the comparator unit to generate sound when the terminal connected by the switch switching unit is not the ground potential.

The display unit may further include: a visual display device connected between the positive potential of the circuit power supply unit and the signal output terminal of the comparison unit to emit light when the terminal connected by the switch switching unit is the ground potential; And an audible display device, which is connected between the positive potential of the circuit power supply unit and the signal output terminal of the comparison unit, and generates sound when the terminal connected by the switch switching unit is the connection potential.

The visual display device is characterized in that it is composed of an LED (LIGHT LIMTTING DIODE), or a lamp (LAMP).

The auditory display device may include a buzzer.

In addition, the circuit power supply, characterized in that consisting of a battery.

The circuit power supply unit may constitute a rectifier circuit using a double insulated transformer.

The rectifier circuit using the double insulated transformer includes: a double insulated transformer configured to connect a primary side to an AC power supply and transfer the converted voltage to the secondary side; A bridge full-wave rectifier circuit connected to the secondary side of the double insulated transformer for full-wave rectifying AC; A zener diode connected in parallel to the propagation signal output terminal of the bridge full-wave rectification circuit, for limiting a voltage output from the bridge full-wave rectification circuit to a predetermined value or less; And a smoothing capacitor connected to the zener diodes in parallel to smooth the voltage applied through the zener diodes.

In the present invention configured as described above, the "electronic device grounding device" contacts the ground discrimination terminal with a human body or a ground ground terminal, and then connects both ends of an AC power supply, a building ground point, and a virtual ground point through the switch switching unit, and then signals. When applied to the comparator through the transfer unit, the switch switching state of the ground potential point can be known through the display unit, thereby enabling the electronic device to be accurately and easily grounded.

Figure 1 is a block diagram showing the configuration of the "electronic device grounding apparatus" of the present invention;

2 is a circuit diagram showing an embodiment according to the spirit of the present invention "electronic device grounding device";

3 is a view showing a wiring method of a single-phase two-wire AC power supply;

4 is a view showing a wiring method of a single-phase three-wire AC power supply;

5 is a circuit diagram showing another embodiment of the signal transmitting unit of the present invention "electronic device grounding device";

Figure 6 is a circuit diagram showing another embodiment of the comparison unit of the "electronic device grounding device" of the present invention;

Figure 7 is a circuit diagram showing another embodiment of the comparison unit of the present invention "electronic device grounding device."

Explanation of symbols for main parts of the drawings

10: circuit power supply unit 20: building ground spout

30: virtual ground unit 40: switch switching unit

50: signal transmission unit 60: comparison unit

70: display unit 80: electronic equipment ground terminal

90: ground discrimination terminal

Hereinafter, the operation and the effect of the present invention will be described in detail with reference to the accompanying drawings.

In this embodiment, the circuit power supply unit is composed of a rectifying circuit using a double insulated transformer, a multi-contact switching switch manually operated by a switch switching unit, and the signal transmission unit is configured using a half-wave rectifying circuit.

In addition, the comparator uses two comparators in series, and displays the LEDs by a visual display device and a buzzer by an audio display device at each output terminal of the two comparators. The display unit may be configured to emit an LED and ring a buzzer when the terminal connected through the multi-contact switch is not a ground terminal.

In addition, the handle of the manually operated multi-contact switching switch is coated with a conductive material and connected to the zero potential point of the circuit power supply portion to be used as the ground discrimination terminal.

First, as shown in Figs. 1 and 2, an AC power source is connected to the primary side of the double insulated transformer T, and the bridge full-wave rectifier circuit BD, the output resistor R1, and the zener diode are connected to the second side. The ZD and the smoothing capacitor C1 are sequentially connected to form the circuit power supply unit 10.

In addition, after connecting the resistors R2 and R3 having different sizes in series with both ends of the AC power source, the common ground connection point of the resistors R2 and R3 is connected to the building grounding point to form the building ground detection unit 20. After connecting the resistors R4 and R5 having the magnitudes in series to both ends of the AC power source, the virtual ground point IG is drawn out to the common connection point of the resistors R4 and R5 to form the virtual ground unit 30. In this case, the resistors R2 and R3 having different sizes use a large value of the resistor to protect the human body from an AC power source.

Thereafter, both ends of the AC power supply, the virtual ground point, and the building ground point G are connected to the selection terminals a, b, c, and d of the multi-point switching switch SW through the protection resistors R6, R7, and R8. To configure the switch switching unit 40. Here, the building ground point (G) is directly connected without a protection resistance because there is no inflow of power.

Further, the protection resistor R9, the DC blocking capacitor C2, and the diode DI are sequentially connected in series to the output terminal of the multi-contact switching switch SW, and then the output resistor R10 is connected to the diode DI. The smoothing capacitor C3 is connected in parallel to form the signal transmission unit 50.

In addition, the signal output terminal of the signal transmission unit 50 is connected to the inverting input terminal of the first comparator COMP1, and the voltage applied from the circuit power supply unit 10 is divided through the voltage divider R11 and R12 to the non-inverting input terminal. After setting the reference voltage by dividing, the signal output terminal of the first comparator COMP1 is connected to the non-inverting input terminal of the second comparator COMP2, and the circuit power supply unit (R14, R15) is connected to the inverting input terminal. The comparison unit 60 is configured by dividing the voltage applied in 10) to set a reference potential. Here, the first comparator COMP1 and the second comparator COMP2 are open collectors.

In addition, an LED, which is a visual display device, is connected between the positive potential of the circuit power supply unit 10 and the signal output terminal of the first comparator COMP1 through a protection resistor R13. The display unit 70 is configured by connecting the positive potential and the buzzer BZ, which is an audio display device, to the signal output terminal of the second comparator COMP2 through the protection resistor R16.

In addition, after coating the handle of the multi-point switching switch (SW) with a conductive material, it is connected to the zero potential point of the circuit power supply unit 10 to form a ground discrimination terminal 90, the multi-contact switching switch (SW) ) And the electronic device connection terminal 80 at the common connection point of the signal transmission unit 50 to connect the ground terminal of the electronic device.

Hereinafter, the operation of the present embodiment configured as described above will be described in detail.

First, the single-phase grounded earth shall be grounded according to the provision of Article 24 of the Electrical Equipment Technical Standard, "Secondary neutral point of secondary side of transformer combining high and low voltage". The case of the wire 110V or 220V voltage is as follows.

That is, as shown in Fig. 3, one side of the AC power supply is grounded to the ground. In Fig. 2, the (A) stage is a non-grounding point and the (B) stage is a grounding point.

First, when the user grasps the handle of the multi-contact switching switch 40, which is a ground discrimination terminal 90 coated with a conductive material, the zero potential point of the circuit power supply unit 10 is connected to the ground through the user (human body). A power path consisting of "ground → AC power supply → switch switching part 40 → signal transmission part 50 → ground discrimination terminal 90 → human body → earth is formed.

In this case, when the user switches the multi-contact switching switch SW and connects to the terminal (a), the voltage is 110V or 220V, so that the resistor R11, the inverting input terminal of the first comparator COMP1 is connected. A voltage higher than the reference voltage set by R12 is applied through the signal transfer unit 50 so that the output voltage becomes a negative voltage. Accordingly, the LED is turned on to indicate that the connection point connected through the multi-contact switching switch SW is not a ground point.

In addition, when a negative voltage is output to the output terminal of the first comparator COMP1, a voltage higher than the reference potential set by the resistors R14 and R15 is applied to the non-inverting input terminal of the second comparator COMP2. The output voltage becomes a negative voltage, which causes the buzzer BZ to operate, indicating that the connection point connected through the multi-contact switching switch SW is not a ground point.

This will be described as follows.

That is, when the user switches the multi-contact switching switch SW and connects it to terminal (a), the "non-grounded terminal of the alternating current power supply → resistance (R6) → multi-contact switching switch (SW) → signal transmission part ( 50) → ground discrimination terminal 90 → human body → earth → earth ground terminal of AC power supply " through a power path consisting of a voltage applied to the signal transmission unit 50 and the rectified voltage of the first comparator COMP1. Will be applied to.

Here, the reference voltage applied to the non-inverting input terminal of the first comparator COMP1 through the voltage dividing resistors R11 and R12 is set to be smaller than the voltage applied through the signal transfer unit 50. The output voltage of the first comparator COMP1 becomes a negative voltage by a signal applied from the signal transfer unit 50.

Then, the LED connected between the first comparator COMP1 consisting of an open collector and the positive terminal of the circuit power supply unit 10 emits light, and the terminal (a) connected to the multi-contact switching switch SW has a ground potential. It is not a dot terminal.

In addition, when the output voltage of the first comparator COMP1 becomes a negative voltage, the output voltage of the second comparator COMP2 becomes a negative voltage due to the same operation as described above, so that the buzzer BZ becomes The ring (a) connected to the multi-contact switching switch (SW) indicates that the ground potential point is not grounded to the ground.

On the other hand, when the user switches the multi-point switching switch SW and connects to the terminal (b) which is the virtual ground point IG, the same size resistors R4 and R5 are connected in series between both ends of the AC power supply. Since the voltage is 55V or 110V, the resistors R11 and R12 are connected to the inverting input terminals of the first comparator COMP1 through the signal transmission unit 50 in the same manner as in the case of connection to the terminal (a). A voltage higher than the set reference voltage is applied so that the output voltage becomes a (-) voltage, which causes the LED to light to indicate that the connection point connected through the multi-contact point switch SW is not a ground point.

In addition, when a negative voltage is output to the output terminal of the first comparator COMP1, a voltage higher than the reference potential set by the resistors R14 and R15 is applied to the non-inverting input terminal of the second comparator COMP2. The output voltage becomes a negative voltage, which causes the buzzer BZ to actuate to indicate that the connection point connected through the multi-contact switching switch SW is not a point point.

In addition, when the user switches the multi-point switching switch SW and connects it to the terminal (c), the terminal is grounded to earth, and therefore, the earth ground terminal of the AC power supply → resistance (R8) → The voltage is not applied to the first comparator COMP1 through the path consisting of the contact switch SW, the signal transmission section 50, the ground discrimination terminal 90, the human body, the ground, and the earth ground terminal of the AC power supply.

Accordingly, the output voltage of the first comparator COMP1 becomes a positive voltage, and thus, the LED is turned off, indicating that the terminal (c) connected to the multi-contact switching switch SW is a grounded terminal. .

In addition, when the output voltage of the first comparator COMP1 becomes a positive voltage, the output voltage of the second comparator COMP2 becomes a positive voltage, and thus, the operation of the buzzer is stopped and the multi-contact switching switch ( (C) connected to SW) indicates that it is a ground point grounded to earth.

In addition, when the user switches the multi-point switching switch SW and connects it to the terminal (d), which is a building ground point, the terminal is grounded to the earth, and thus the terminal is connected to the terminal (c) as in the case of connecting to the terminal (c). Earth ground terminal of AC power supply → voltage drop and protection resistance (R8) → multi contact switching switch (SW) → signal transmission unit (50) → ground discrimination terminal (90) → human body → earth → earth ground terminal of AC power supply A voltage is not applied to the first comparator COMP1 through the path consisting of ”. Accordingly, the output voltage of the first comparator COMP1 becomes a positive voltage, which causes the LED to turn off, indicating that the terminal (c) connected to the multi-point switching switch SW is a grounded terminal. .

In addition, when the output voltage of the first comparator COMP1 becomes a positive voltage, the output voltage of the second comparator COMP2 becomes a positive voltage, and thus, the operation of the buzzer is stopped and the multi-contact switching switch ( Terminal (c) connected to SW) indicates that the terminal is grounded to earth.

However, when the terminal (d), which is the building ground point, is not grounded to the ground, the resistor R2 is connected to the terminal (d) by the resistors R2 and R3 having different magnitudes constituting the building ground detection unit 20. As much as the voltage proportional to R3) is induced, the LED is turned on and the buzzer BZ rings to indicate that the ground point is not the ground point, similarly to the terminal (a) or (b).

In other words, when the building ground point G is grounded, even if a voltage proportional to the resistors R2 and R3 is induced, the induced voltage is released to the ground and the ground ground potential appears at the terminal (d). When the and buzzers do not operate, but the building ground point G is not grounded to the ground, the voltage divided by the resistors R2 and R3 is induced at the terminal (d) so that the LED and the buzzer operate. This indicates that it is not a ground point.

Therefore, the LED is not turned on and the contact point where the buzzer does not sound is grounded to the ground, and the user may switch the multi-point switching switch SW while fixing the switch at the point where the LED and the buzzer do not operate.

Then, the ground terminal of the electric equipment connected to the other side of the multi-point switching switch SW is connected to the ground of the power supply, thereby preventing human body from electromagnetic waves and leakage current induced in the ground terminal of the electronic device. You can do it.

Second, the case where the supplied AC power is a single-phase three-wire 220V as shown in FIG. 4 is as follows.

As is well known, in the case of the single-phase three-wire type 220V, the voltage between the both ends (X, Z) is 220V, and when both grounds (Y) are referenced, each end has a voltage of 110V. Therefore, when neither side of the 220V AC power supplied to the home is grounded to the ground, in this case, when both ends are connected through the same size resistor, the virtual ground point, which is a common connection point of the resistors, is connected to the earth ground potential. Becomes

First, when the user grasps the handle of the multi-contact switching switch 40 which is the ground discrimination terminal 90 coated with a conductive material, the circuit power supply unit 10 is connected to the circuit 10 through a user (human body) as in the case of a single-phase two-wire AC power supply. A zero potential point is connected to the ground, so that a power path consisting of "earth → AC power supply → switch switching part 40 → signal transmission part 50 → ground discrimination terminal 90 → human body → earth" is formed.

At this time, when the user switches the multi-contact switching switch SW and connects to the (a) terminal or the (c) terminal, the voltage is 100 V when the ground potential is used as a reference. As in the case, “Ungrounded terminal of AC power supply → voltage drop and protection resistance (R6) → multi-contact switching switch (SW) → signal transmission unit (50) → ground discrimination terminal (90) → human body → earth → AC power supply The voltage is applied to the signal transmission unit 50 through a power path consisting of an earth ground terminal.

Accordingly, the voltage rectified by the signal transfer unit 50 is applied to the inverting input terminal of the first comparator COMP1 so that its output voltage becomes a negative voltage, thereby causing the LED to light up, thereby causing the multi-contact. It indicates that the terminal connected via the changeover switch SW is not a ground point.

In addition, when a negative voltage is output to the output terminal of the first comparator COMP1, a voltage higher than the reference potential set by the resistors R14 and R15 is applied to the non-inverting input terminal of the second comparator COMP2. The output voltage becomes a negative voltage, which causes the buzzer BZ to actuate to indicate that the connection point connected through the multi-contact switching switch SW is not a ground point.

On the other hand, when the user switches the multi-point switching switch SW and connects it to the terminal (b), the voltage is grounded by the resistors R4 and R5 of the same size connected in series between both ends of the AC power supply. Since it becomes 0V, the (C) terminal connected to the multi-contact switching switch (SW) becomes inoperable from the LED (BZ) as in the case of connecting to the (c) terminal in a single-phase two-wire AC power supply. Indicates that the terminal is grounded to earth.

In addition, when the user switches the multi-contact switching switch SW and connects it to the terminal (d), the same operation as in the case of the single-phase two-wire AC power supply is performed, and thus the detailed description thereof will be omitted.

Therefore, when the LED is not turned on and the contact point b that does not sound the buzzer is grounded to the ground, the user switches the multi-point switching switch SW and then fixes the switch at the point where the LED and the buzzer do not operate. do.

Then, the ground terminal of the electronic device connected to the other side of the multi-point switching switch SW is connected to the earth ground point of the power supply, thereby preventing human body from electromagnetic waves and leakage current induced in the ground terminal of the electronic device. You can do it.

That is, when the LED and the buzzer do not operate, it indicates that the ground is completely performed.

In addition, when the human body is connected to the ground discriminating terminal at any time during operation, the grounding terminal can be known whether the grounding terminal is connected, and the grounding point can be easily found by repeating the operation even when the plug of the electronic device is disconnected from the outlet. Will be.

However, in the above embodiment, the circuit power supply unit is configured as a rectifier circuit using a double insulated transformer, but it can be configured using a battery or using a rechargeable battery provided with a charging circuit. Reveal.

Incidentally, in the above embodiment, the signal transmission unit is constituted by a half-wave rectifier circuit, but as shown in Fig. 5, it can be seen that it can be constituted by a double voltage rectifier circuit.

In the above embodiment, the comparator is composed of two comparators connected in series, but is connected in parallel as shown in FIG. 6, or one comparator as shown in FIG. Note that it can be configured using

In the above embodiment, the ground discrimination terminal is formed by coating a conductive material on the handle of the multi-contact switching switch, and then connecting it to the zero potential point of the circuit power supply unit. Note that it can be installed separately.

Further, in the above embodiment, the switch switching unit is configured by using a manually operated multi-contact switching switch, but the terminal connected by detecting the output signal of the comparing unit without departing from the technical idea of the present invention. Note that it can be configured to automatically switch sequentially until is a signal indicating the ground potential.

As described above, the present invention "electrical device grounding device", the presence of the grounding wire of the power line, whether the grounding of the building and whether or not the grounding of the virtual ground terminal to recognize the user through the visual display device and auditory display device Therefore, the ground terminal of the electronic device can be effectively and easily grounded, as well as the cost of production can be reduced due to the simplicity of the circuit, there is an effect that can prevent the malfunction.

Claims (13)

A building ground detection unit connected between both ends of an AC power source and a building ground point connected to the ground, and outputting a signal according to whether the building ground point is grounded or not; A virtual grounding part connected to both ends of the AC power supply and dividing the size of the AC power supply; A switch switching unit for switching between both ends of the AC power source, a building ground point, and a virtual ground point in a predetermined method; A signal transmission unit connected to the signal output terminal of the switch switching unit and converting and rectifying the magnitude of the signal applied through the switch switching unit; A comparison unit for comparing a signal applied from the signal transmission unit with a predetermined reference value and outputting a signal indicating whether a terminal connected by the switch switching unit is a ground potential; A display unit connected to the signal output terminal of the comparison unit to display whether the terminal connected by the switch switching unit is a ground potential; A circuit power supply unit for supplying an independent direct current power source separated from the AC power source to the comparison unit and the display unit; A ground discriminating terminal made of a conductive material and connected to the zero potential point of the circuit power supply unit and connecting the zero potential point of the circuit power supply unit to the earth through the human body or the earth ground terminal ; And an electronic device ground terminal connected in common between the signal output terminal of the switch switching unit and the signal input terminal of the signal transmission unit to connect the ground terminal of the electronic device. The electronic device grounding apparatus according to claim 1, wherein the building ground detecting unit is configured by connecting two resistors having different sizes in series with both ends of an AC power source, and then connecting the building ground point to a common connection point of the resistors. The electronic device grounding apparatus according to claim 1, wherein the virtual grounding unit is configured by connecting two resistors having the same size in series to both ends of an AC power source, and using a common connection point of the resistors as a virtual grounding point. The electronic device grounding apparatus of claim 1, wherein the switch switching unit comprises a multi-contact switching switch that is manually operated. The electronic device grounding apparatus according to claim 4, wherein the manually operated multi-contact switching switch coats the handle with a conductive material and connects the handle to the zero potential point of the circuit power supply to use as a ground discriminating terminal. . The electronic device grounding apparatus of claim 1, wherein the switch switching unit is configured to detect an output signal of the comparator and to automatically switch sequentially until the connected terminal becomes a signal indicating a ground potential. The electronic device grounding apparatus according to claim 1, wherein the signal transmission unit comprises a half-wave rectifier circuit for half-wave rectifying a signal applied through the switch switching unit. The electronic device grounding apparatus according to claim 1, wherein the signal transmitting unit comprises a double voltage rectifying circuit for rectifying the voltage applied through the switch switching unit. The apparatus of claim 1, wherein the comparator is configured to divide the voltage applied from the circuit power supply unit by a predetermined method as a reference potential and compare the values of the two signals using the signal applied from the signal transfer unit as a comparison potential. Electronic device grounding device characterized in that. The electronic device grounding apparatus according to claim 9, wherein the comparator is configured to compare the reference potential and the comparison potential by connecting a plurality of comparators in series or in parallel. The display apparatus of claim 1, wherein the display unit comprises: a visual display device connected between the positive potential of the circuit power supply unit and the signal output terminal of the comparison unit to emit light when the terminal connected by the switch switching unit is not the ground potential; An electronic device grounding device comprising an audible display device connected between a positive potential of the circuit power supply unit and a signal output terminal of the comparison unit to generate sound when the terminal connected by the switch switching unit is not the ground potential. . The display device of claim 1, wherein the display unit comprises: a visual display device connected between a positive potential of the circuit power supply unit and a signal output terminal of the comparison unit to emit light when the terminal connected by the switch switching unit is the ground potential; And an auditory display device connected between the positive potential of the circuit power supply unit and the signal output terminal of the comparison unit to generate sound when the terminal connected by the switch switching unit is the ground potential. The electronic device grounding apparatus according to claim 1, wherein the circuit power supply unit constitutes a rectifier circuit using a double insulated transformer.