KR100332234B1 - An automatic ground apparatus for grounding power input ground line - Google Patents

Abstract

PURPOSE: An automatic earthing device of an input power is provided to prevent the electric shock accident and shield the harmful electromagnetic wave by detecting a ground wire out of a power line to automatically ground a power line that is not grounded. CONSTITUTION: A full-wave rectifying unit(10) rectifies an AC(Alternating Current) power to a DC(Direct Current) power. A power line detecting unit(30) detects whether a power line(a) of a power plug(1) is an electricity supplying wire(a positive power line) and outputs a bias voltage, if so. A switching unit(20) receives the DC power outputted from the full-wave rectifying unit(10), when the power line detecting unit(30) detects a negative power line of the power lines of the power plug(1), is switched so as to ground the negative power line to a grounding line. An amplifying unit(40) amplifies the bias voltage outputted from the power line detecting unit(30). A switching unit(50) is turned on by an amplified signal outputted from the amplifying unit(40). A first time constant circuit(60) limits the turn-on time of the switching unit(50). When a signal for determining one of two stable states is inputted, a flip-flop(70) maintains the stable state until a signal for determining the other stable state is inputted. A noise eliminating unit(90) blocks noise applied to the flip-flop(70). A display unit(100) displays an operation state of the switching unit(20).

Description

Automatic grounding device of input power {AN AUTOMATIC GROUND APPARATUS FOR GROUNDING POWER INPUT GROUND LINE}

The present invention relates to an automatic grounding device for an input power source capable of preventing an electric shock accident and shielding harmful electromagnetic waves.

The present invention connects loads (eg, home appliances, industrial electronics) to commercial AC power supplies (110V, 220V) supplied in various environments such as homes, offices, construction sites, etc. from electric power companies, emergency generators, or other power sources. The present invention relates to an automatic grounding device for input power that can automatically detect an ungrounded power line among feeder lines and automatically ground and display an ungrounded power line.

Examples of power supplied from a conventional power supply source to a home, a construction site, or an office include a single-phase three-wire 220V power source or a single-phase two-wire 220V power source supplied from a utility company to a home, 220V and single-phase two-wire 110V power source. At home or office, construction site, you can get power up to 110V or 220V and power from mobile generator.

In general, a separate electromagnetic wave breaker to prevent an electric shock and to block electromagnetic waves emitted from home appliances and industrial electronics when power is applied to home appliances or industrial electronics in homes, offices or other situations. Must be installed in home appliances or industrial electronics, or they must be grounded by finding a ground wire in the electrical input line.

However, in order to block harmful electromagnetic waves generated from home appliances or industrial electronics, such a conventional method can block harmful electromagnetic waves only by making and attaching a blocking network to the home appliances or industrial electronics, and grounding the blocking network. In this case, it is not only difficult to actually ground, but even if grounded, there is a problem that if you move the household electrical appliances or industrial electronics, the grounding must be performed again each time, thereby causing a lot of inconvenience.

In other words, as a preferable grounding example, the grounding wire is drawn from inside a home appliance such as a washing machine or a refrigerator used in a home or industrial electronics, and connected to a faucet or an arbitrarily grounded grounding wire to prevent an electric shock accident. At the same time, the harmful electromagnetic waves are blocked, but such a grounding method has to be grounded every time the home appliance or industrial electronics is moved to another place, and there are various problems such as a lot of troublesome work and inconvenience.

In addition, it is virtually impossible for a user to connect the internal ground wire in one direction at all times, and in the case of home use, since the electrical wiring work was performed without considering the ground wire, especially in electrical work, the position of the ground wire is different at each outlet. There was a problem that it is actually difficult to find and connect the ground wire because it is installed incorrectly.

Accordingly, the present invention has been made in view of the above various problems, and an object of the present invention is to easily detect and display a ground line in a feeder line (power line), and to automatically ground the ungrounded power line. The present invention provides an automatic grounding device for input power.

Still another object of the present invention is to provide an automatic grounding device for an input power supply which can prevent an electric shock accident and automatically block harmful electromagnetic waves.

In order to achieve the above object, the automatic grounding device for input power according to the present invention includes full-wave rectifying means for full-wave rectifying AC power to DC power, and whether the power line (a) of the power plug is an electric supply line (+ side power line). Power supply line detection means for detecting whether or not and outputting a bias voltage in the case of an electric supply line, and receiving a DC power output from the full-wave rectifying means, and the power supply line detecting means receives the negative side of the power line (a, b) A switching means switched to ground the negative-side power line to a ground line, an amplifying means for amplifying a bias voltage output from the power supply line detecting means, and an amplifying signal output from the amplifying means when a power line is detected. Switching means switched on by the first switch, a first time constant circuit for limiting the switching time of the switching means, and one of two stable states When a signal for determining the stable state is input, a flip-flop for maintaining one stable state until a signal for determining the other stable state is input, and a second time constant circuit for limiting the time for which the signal is applied to the flip-flop. And a noise removing means for blocking the application of noise to the flip-flop, and display means for displaying an operating state of the switching means.

1 is a block diagram of an automatic grounding apparatus for input power according to an embodiment of the present invention;

2 is a detailed circuit diagram of an automatic grounding device for an input power source connected to a load according to an embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

1: power plug 10: full-wave rectifying means

11: bridge rectification circuit 20: switching means

21: first switching circuit 21a: first phototriac

22: second switching circuit 22a: first phototriac

30: electric supply line detection means 40: amplification means

50: switching means 60: first time constant circuit

70: flip-flop 80: second time constant circuit

90: noise removing means 91: first noise removing circuit

92: second noise removing circuit 100: display means

101: first display circuit 102: second display circuit

110: power consumption prevention means 111: first power consumption prevention circuit

112: second power consumption protection circuit 130: load main body

132: Load 134: Controller

Hereinafter, an automatic grounding apparatus for an input power source according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an automatic grounding device for input power according to an embodiment of the present invention, Figure 2 is a detailed circuit diagram connecting the automatic grounding device of the input power according to an embodiment of the present invention to a load.

1 and 2, the automatic grounding apparatus for input power according to an embodiment of the present invention includes a full-wave rectifying means 10 for full-wave rectifying AC power to DC power, and a power line of the power plug 1; power supply line detecting means 30 for detecting whether (a) is an electric supply line (+ side power supply line) and outputting a bias voltage when receiving the electric supply line, and receiving a DC power output from the full wave rectifying means 10 When the power supply line detecting means 30 detects the negative side power line among the power lines a and b of the power plug 1, the switching is switched to ground the negative side power line to the ground line c. Means 20, an amplifying means 40 for amplifying the bias voltage output from the power supply line detecting means 30, and a switching means 50 switched on by an amplifying signal output from the amplifying means 40. And limiting the time that the switching means 50 is switched on. When the first time constant circuit 60 and a signal for determining one of the two stable states are input, the flip-flop 70 maintains one stable state until the signal for determining the other stable state is input. ), A second time constant circuit 80 for limiting the time for which the signal is applied to the flip-flop 70, noise removing means 90 for blocking noise from being applied to the flip-flop 70, and And display means 100 for displaying the operation state of the switching means 20, and power consumption preventing means 110 for preventing power consumption from the switching means 20 (the power supply line detecting means 30). Is preferably a light emitting diode or lamp).

As shown in FIG. 2, the full-wave rectifying means 10 includes a bridge full-wave rectifying circuit 11 which receives AC power through a current adjusting capacitor C 1 and a resistor R 1 when the switch sw is turned on, and full-wave rectifies it; Zener diode 12 for outputting a power supply voltage of a predetermined level (12V or 24V) by bypassing a power supply of a predetermined level (12V or 24V) or more of the DC power source rectified in the bridge rectifier circuit 11, and the zener diode It consists of the capacitor C2 which smoothes and outputs DC power of a predetermined level (for example, 12V, 24V, etc.) output from (12).

The switching means 20 outputs from the capacitor C2 of the full wave rectifying means 10 when the power supply line a of the power plug 1 detected by the power supply line detection means 30 is an electric supply line. The first photo triac 21a which receives the current through the resistor R2 and is switched on by receiving AC power through the first power consumption preventing circuit 111 of the power consumption preventing means 110, The power supply of the first switching circuit 21 composed of an output resistor R3 connected to the output terminal of the first phototriac 21a and the power plug 1 detected by the power supply line detecting means 30; When the line (b) is an electric supply line, while receiving the current output from the capacitor (C2) of the full-wave rectifying means 10 through the resistor (R4), the second power consumption of the power consumption preventing means (110). A second photo triac 22a switched on by receiving AC power through the prevention means 112; It consists of the 2nd switching circuit 22 comprised from the output resistor R5 connected to the output terminal of the 2nd photo triac 22a.

The first photo triac 21a includes a light emitting diode LED1 that emits light when the power line a of the power plug 1 detected by the power supply line detecting means 30 is an electric supply line, and the light emission. And a first triac PT1 that is switched on by receiving light emitted from the diode LED1, and the second photo triac 22a is a power plug detected by the power supply line detecting means 30. The light emitting diode LED2 which is emitted when the power supply line b of 1) is an electric supply line, and a second triac PT1 that is switched on by receiving light emitted from the light emitting diode LED2.

The amplifying means 40 amplifies the bias voltage output from the electric supply line detecting means 30 when the power supply line a of the power plug 1 detected by the electric supply detecting line 30 is an electric supply line. And a resistor (R6) connected between the transistor (Q1), the collector terminal of the transistor (Q1) and the capacitor (C2) of the full-wave rectifying means (10), and the signal amplified by the transistor (Q1). It consists of 1 NAND gate G1.

The switching means 50 is composed of a second NAND gate G2 switched on by a signal amplified by the first NAND gate G1. During the time period set in the first time constant circuit 60, The signal amplified by the first NAND gate G1 is switched on.

The first time constant circuit 60 includes a capacitor C3 having one side connected to the capacitor C2 of the full-wave rectifying means 10 and a resistor R7 having one side connected to the capacitor C3 and the other side grounded. It consists of.

The second time constant circuit 80 includes a resistor R8 having one side connected to the capacitor C2 of the full-wave rectifying means 10 and a capacitor C4 connected in series with the resistor R8 and the other side grounded. And a reverse current prevention diode D1 connected in parallel with the resistor R8, and a resistor R9 connected in parallel with the resistor R8 and the capacitor C4.

Noise is input to the flip-flop 70 between an input terminal of one side of the third NAND gate G3 of the flip-flop 70 and a ground side of the capacitor C4 of the second time constant circuit 80. A first noise canceling circuit 91 is connected, and an input terminal of one side of the fourth NAND gate G4 of the flip-flop 70 and a ground side of the capacitor C4 of the second time constant circuit 80 are connected. The second noise removing circuit 92 is connected to the flip-flop 70 to prevent noise input.

In the automatic grounding device for the input power supply according to the present invention, the first noise removing circuit 91 uses a capacitor C5, and the second noise removing circuit 92 uses a capacitor C6.

The power consumption preventing means 110 is a first power consumption preventing circuit 111 connected between the power supply line (a) of the outlet (1) and the first switching circuit 21 of the switching means 20, the outlet ( And a second power consumption preventing circuit 112 connected between the power supply line b of 1) and the second switching circuit 22 of the switching means 20, wherein the first and second power consumption preventing circuits are used. Reference numerals 111 and 112 are constituted by capacitors C7 and C8, respectively (the power consumption preventing means 110 does not need to be provided).

The display means 100 comprises a first display circuit 101 for displaying the conduction of the first switching circuit 21 of the switching means 20 and a conduction of the second switching circuit 22 of the switching means 20. Is composed of a second display circuit (102) for displaying a current limiting resistor (R12) having one side connected to a capacitor (C2) of the full-wave rectifying means (10), and the current. Connected to the other side of the limiting resistor R12 to indicate that the power supply line a of the power plug 1 is connected to the ground line c when the light emitting diode LED1 of the first phototriac 21a is light-emitted. The second display circuit 102 includes a current limiting resistor R11 having one side connected to the capacitor C2 of the full-wave rectifying means 10, and the current limiting resistor R11. Is connected to the other side to indicate that the power line (b) of the power plug (1) is connected to the ground line (c) when the light emitting diode (LED2) of the second phototriac (22a) is emitted. It is composed of the LED (LED4).

In FIG. 2, F is a fuse, 130 is a load main body to which the automatic grounding device of the input power supply of the present invention is applied, for example, a home appliance or an industrial machine / electronic product, and 132 is a load main body 130. ), And 134 is a controller for controlling the application of power to the load 132 of the load main body 130.

Next, the operation and effect of the automatic grounding device of the input power according to the embodiment of the present invention configured as described above will be described.

First, when the power plug 1 is inserted into an outlet (not shown), and then the switch sw is turned on, the AC power of the full-wave rectifying means 10 passes through the capacitor C1 and the resistor R1. DC power applied to (11), and full-wave rectified by the bridge full-wave rectifier circuit 11 outputs a DC power of a predetermined level (12v or 24V) by the zener diode 12, and to the DC power of the predetermined level. The pulsed components included are output smoothed in the capacitor (C2).

At this time, when the power supply line detection means 30 detects that the power supply line a of the power supply plug 1 is an electricity supply line (+ side power supply line), a bias voltage is output from the power supply line detection means 30. As the transistor Q1 is switched on, a low level signal is input to the input terminal of the first NAND gate G1 through the resistor R6.

When a low level signal is input to the input terminal of the first NAND gate G1, a high level signal is output to the output terminal thereof. Therefore, the switching means 50 including the second NAND gate G2 has a low level. The signal is output, and a low level signal is input to the input terminal of the fourth NAND gate G4 of the flip-flop 70, and a high level signal is output to the output terminal of the fourth NAND gate G4.

At this time, the second switching circuit 21 of the switching means 20 is switched on. That is, a DC current of a constant level 12V smoothed by the capacitor C2 of the full-wave rectifying means 10 to the light emitting diode LED2 of the second phototriac 22a flows through the resistor R4 and emits light. As the light emitting diode LED2 emits light, the second triac PT2 conducts to fuse the F, the second power consumption preventing circuit 112 (C8), the second triac PT2, and the resistor R5. The power line b of the power plug 1 is automatically grounded to the ground line c while the load main body 130 is grounded, and the power line b; The light emitting diode LED4 constituting the second display circuit 102 of the display means 100 can be displayed by emitting light, and the power supply lines a and b Since the power line (b; -side line) is found and the ground line (c) is automatically grounded, the load (13) is controlled through the controller 134 during the use of electronic products or during the use of industrial machinery / electronic products. 2) It can prevent electric shock accidents caused by leakage of power applied to 2) and cut off electromagnetic waves harmful to human body automatically.

On the other hand, when the power supply line detecting means 30 detects that the power supply line a of the power plug 1 is a negative side power supply line, the bias voltage is not output from the power supply line detection means 30, and thus the amplification means ( As the transistor Q1 of the 40 is turned off, a high level signal is input to the input terminal of the first NAND gate G1 of the amplifying means 40.

When a high level signal is input to the input terminal of the first NAND gate G1, a low level signal is output to the output terminal thereof. Therefore, a high level signal is output from the switching means 50 including the second NAND gate G2. A high level signal is input to an input terminal of the fourth NAND gate G4 of the flip flop 70, and a low level signal is output to an output terminal of the fourth NAND gate G4. A low level signal is input to an input terminal of the NAND gate G3, and a high level signal is output to an output terminal of the third NAND gate G3.

At this time, the first switching circuit 21 of the switching means 20 is switched on. That is, a DC current of a constant level 12V smoothed by the capacitor C2 of the full-wave rectifying means 10 to the light emitting diode LED1 of the first phototriac 21a flows through the resistor R2 and emits light. As the light emitting diode LED1 emits light, the first triac PT1 conducts the switch sw, the first power consumption preventing circuit 111 (c7), the first triac PT1, and the resistor R3. The power line a of the power plug 1 is automatically grounded to the ground line c through the ground, and the load main body 130 is grounded, and the power line a; The light emitting diode LED3 constituting the first display circuit 101 of the display means 100 can be emitted by displaying that the side line is grounded to the ground line c. Since the power line (a; -side line) is found and automatically grounded, it is applied to the load 132 through the controller 134 during the use of electronic products or the use of industrial machinery / electronic products. It can prevent electric shock accidents caused by leakage of power and automatically cut off electromagnetic waves harmful to human body.

In the automatic grounding apparatus of the input power source according to the present invention, one side of the input terminal of the third NAND gate G3 of the flip-flop 70 and the ground side of the capacitor C4 of the second time constant circuit 80 A first noise removing circuit 91 composed of a capacitor C5 is connected between the first noise removing circuit 91 and an input terminal of one side of the fourth NAND gate G4 of the flip-flop 70 and the second time constant circuit 80. Since the second noise canceling circuit 92 composed of the capacitor C6 is connected between the ground side of the capacitor C4, the noise is not input to the flip-flop 70, so that the flip-flop ( 70) prevents malfunction.

The signal amplified by the first NAND gate G1 is switched on at the input terminal of the switching means 50 during the time period set in the first time constant circuit 60, and is switched on at the input terminal of the flip-flop 70. The signals are connected during the time set by the two time constant circuits 80.

As described above, according to the automatic grounding apparatus for input power according to the present invention, when the power supply line detecting means detects whether any one of the two power lines of the power plug is an electric supply line, the power supply line detecting means. Outputs a bias voltage, amplifies the bias voltage output from the power supply line detecting means, and switches on the switching means by the amplified signal, thereby switching the power supply line detected by the power supply line detecting means. Since the-side line of the power line is grounded to the ground line, the indicating means that the-side line is grounded to the ground line of the power supply line (power line) can be indicated by the display means, and the-side line that is not grounded in the power line Can be grounded automatically. As, there is an excellent effect that the use of electronic products or industrial machinery / electronics use prevents electric shock accidents and at the same time automatically block harmful electromagnetic waves on the human body.

Claims (3)

Full-wave rectifying means 10 for full-wave rectifying AC power to DC power, and detecting whether the power supply line a of the power plug 1 is an electric supply line (+ side power supply line) The negative power supply line of the power supply plug 1 has been detected by the power supply line detection means 30 by receiving the output power supply line detecting means 30 and the DC power output from the full wave rectifying means 10. In this case, the switching means 20 is switched to ground the negative-side power line to the ground line, the amplifying means 40 for amplifying the bias voltage output from the power supply line detecting means 30, and the amplifying means ( A switching means 50 switched on by the amplified signal output from 40, a first time constant circuit 60 for limiting the switching-on time of the switching means 50, and one of two stable states When the signal to determine the stable state is input A flip-flop 70 for maintaining one stable state until a signal for determining a stable state is input; a second time constant circuit 80 for limiting the time for which the signal is applied to the flip-flop 70; Automatic grounding of input power, characterized in that it comprises a noise removing means (90) for blocking the noise is applied to the flip-flop (70), and a display means (100) for displaying the operating state of the switching means (20). Device. According to claim 1, wherein the switching means 20 is the power supply line (1) detected by the power supply line detecting means 30 of the power supply line (a) of the electric power supply line when the power supply rectification means (10) Receiving the current output from the capacitor (C2) through the resistor (R2), at the same time, the first photo tri switch is switched on by receiving the AC power through the first power consumption prevention circuit 111 of the power consumption preventing means (110) A first switching circuit 21 composed of an evil and an output resistor R3 connected to an output terminal of the first phototriac 21a, and a power plug 1 detected by the power supply line detecting means 30; When the power supply line (b) of the electric supply line of the electric current is received from the capacitor (c2) of the full-wave rectifying means 10 through the resistor and at the same time prevents the second power consumption of the power consumption preventing means (110). A second photo triac switched on receiving AC power via means 112 And a second switching circuit (22) composed of an output resistor (R5) connected to an output terminal of the second photo triac (22a). The display device (102) according to claim 1, wherein the display means (102) comprises a first display circuit (101) for displaying the conduction of the first switching circuit (21) of the switching means (20) and a second switching of the switching means (20). And a second display circuit 102 for displaying the conduction of the circuit 20. The first display circuit 101 includes a current limiting resistor having one side connected to the capacitor C2 of the full-wave rectifying means 10. R12 and the other side of the current limiting resistor R12, and the power supply line a of the power plug is connected to the ground line c when the light emitting diode LED1 of the first phototriac 21a emits light. The second display circuit 102 includes a current limiting resistor R11 having one side connected to a capacitor C2 of the full-wave rectifying means 10, and the current limiting. The power line b of the power plug 1 is connected to the ground line c when the light emitting diode LED2 of the second phototriac 22a is connected to the other side of the resistor R11. Automatic earthing switch of the input power, characterized in that it is composed of the LED (LED4) for displaying the Empty.