KR20220158503A - Apparatus for displaying live wire state - Google Patents

Abstract

The present invention relates to a live wire display apparatus. The live wire display apparatus comprises: a charging structure which includes a multilayer printed circuit substrate and in which charging and discharging operations are performed by a voltage applied to an adjacent conducting wire; a full-wave rectification unit which is connected to the charging structure and converts an AC voltage applied from the charging structure into a DC voltage to output the DC voltage; a live wire determiner which is connected to the full-wave rectification unit and determines a state of the conducting wire as a live wire state when operation starts by using the DC voltage applied from the full-wave rectification unit as a driving power source and the DC voltage is applied from the full-wave rectification unit; and a display connected to the live wire determiner to display the live wire state. Accordingly, the charging structure is easily designed, and an active state of the conducting wire can be determined even when no current flows through the conducting wire.

Description

Live wire display {APPARATUS FOR DISPLAYING LIVE WIRE STATE}

The present invention relates to a live line display device, and more particularly, to a live line display device that displays a live line state of a line.

BACKGROUND OF THE INVENTION Electric energy generated in a power plant using fossil raw materials or nuclear power is supplied to various places of use such as homes and factories through lines such as power lines.

At this time, the line installed between the power plant and the end-use is very long and complicatedly connected, and disconnection accidents occur due to aging or typhoons.

Therefore, when replacing or repairing such a line, it is impossible to visually check whether or not electricity is actually flowing through the line, so the risk of electric shock is very high, and in fact, human accidents due to electric shock frequently occur during work .

Therefore, there is a need for a device that visually or audibly informs whether or not electricity is being supplied to electrical devices such as lines or circuit breakers.

Republic of Korea Utility Model Registration No. 20-04114256 (Announcement date: April 17, 2006, designation name: live wire indicator)

The problem to be solved by the present invention is to display the live wire state of the conducting wire.

Another problem to be solved by the present invention is to determine a frequency abnormal state of a voltage applied to a wire.

A live display device according to one feature of the present invention for solving the above problems is made of a multilayer printed circuit board, and is connected to a charging structure in which charging and discharging operations are performed by a voltage applied to an adjacent conducting wire, the charging structure, A full-wave rectifier that converts the AC voltage applied from the charging structure into a DC voltage and outputs the full-wave rectifier, is connected to the full-wave current unit, and operates by using the DC voltage applied from the full-wave rectifier as a driving power source, and the DC voltage from the full-wave rectifier A live wire determiner for determining a state of the conducting wire as a live wire state when voltage is applied, and an indicator connected to the live wire determiner to display the live wire state.

The charging structure includes a plurality of insulating layers each composed of a circuit board and stacked in a vertical direction, a plurality of conductive layers located on each of the plurality of insulating layers and stacked in a vertical direction, and odd-numbered conductive layers among the plurality of conductive layers. A connecting first via hole and a second via hole connecting even-numbered conductive layers among the plurality of conductive layers may be included.

Each conductive layer may have a plate shape having a rectangular planar shape.

Each conductive layer may include a connection portion extending in a first direction and a plurality of comb portions extending spaced apart from each other in a second direction crossing the first direction from the connection portion.

The circuit board may be a rigid circuit board or a flexible circuit board.

It is connected to the charging structure, and may further include a square wave generator for outputting a square wave signal using an AC voltage applied from the charging structure.

The live line determiner calculates the frequency magnitude by counting the (+) and (-) state signals of the square wave signal applied from the square wave generator, and when the calculated frequency magnitude is less than the set magnitude, the voltage applied to the wire The frequency state of can be determined as an abnormal state.

The live wire display device according to the above characteristics may further include a light emitting unit connected to the live wire determiner and turned on when a frequency state of the voltage applied to the wire is in an abnormal state.

The charging structure may be air-grounded or earth-grounded.

The full-wave rectifier, the live wire determiner, and the indicator may be located in the charging structure.

According to these characteristics, since a charging structure in which electric charges are charged and discharged using a multilayer printed circuit board is manufactured, the design of the charging structure can be easily designed and the structure can be simplified.

In addition, since it is determined whether the corresponding conductor is live by using an electric field generated by the application of a voltage to an adjacent conductor, the live state of the conductor can be determined even if the current does not flow in the conductor.

In addition, it is possible to determine whether or not the frequency of the voltage applied to the wire is abnormal as well as whether or not the wire is live.

1 is a schematic block diagram of a device for displaying a live line and measuring a frequency according to an embodiment of the present invention.
FIG. 2 is a schematic perspective view of an example of the filling structure of FIG. 1 .
FIG. 3 is a perspective view of a charging structure in FIG. 2 in which an insulating layer located in the middle is removed except for the uppermost and lowermost insulating layers.
4 is a schematic perspective view of another example of the filling structure of FIG. 1 .
FIG. 5 is a perspective view of a charging structure in FIG. 4 in which an insulating layer is removed.
FIG. 5 is a perspective view of a charging structure in FIG. 4 in which an insulating layer is removed.
FIG. 6 is a waveform diagram showing an example of a signal output from the square wave generator of FIG. 1 .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that adding a detailed description of a technology or configuration already known in the related field may obscure the gist of the present invention, some of them will be omitted from the detailed description. In addition, the terms used in this specification are terms used to properly express the embodiments of the present invention, which may vary depending on people or customs related to the field. Therefore, definitions of these terms will have to be made based on the content throughout this specification.

The terminology used herein is intended only to refer to specific embodiments and is not intended to limit the present invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. As used herein, the meaning of 'comprising' specifies specific characteristics, regions, integers, steps, operations, elements and/or components, and other specific characteristics, regions, integers, steps, operations, elements, components and/or groups. does not exclude the presence or addition of

Hereinafter, a live line display device according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

The active line display device 1 of this example may be positioned adjacent to the conducting wire 100 for detecting energization in a non-contact state or may be mounted on the corresponding conducting wire 100 using a conductive clamp or the like.

As shown in FIG. 1, such a live display device 1 includes a conducting wire 100, a charging structure 10 positioned adjacent to the conducting wire 100, and a power generator 20 connected to the charging structure 10. , a live wire determiner 30 connected to the power generator 20, an indicator 40 connected to the live wire determiner 30, and a light emitting unit 50 may be provided.

The wire 100 is a wire to which an AC voltage is applied, and may generate leakage conductance by generating an electric field according to the applied AC voltage.

The charging structure 10 positioned adjacent to the conducting wire 100 is a capacitor that charges electric charges between the conducting wire 100 and the air by an electric field according to an AC voltage applied to the conducting wire 100. can function

Accordingly, the charging structure 10 may be charged while the state of the AC voltage is (+) and discharged while the state is (-).

The charging structure 10 may include a (+) terminal and a (-) terminal, and the (+) terminal may be located adjacent to the conductive wire 100 .

This charging structure 10 will be described in detail as follows.

The power generator 20 may output a square wave by using an AC voltage according to charging and discharging operations of the charging structure 10 and generate and output driving power.

Accordingly, the power generator 20 may include a square wave generator 21 and a full-wave rectifier 22 connected to the (+) terminal of the charging structure 10, respectively.

Therefore, when a voltage is applied to the conductive wire 100 in a live state, the charging structure 10 generates an AC voltage S1 as shown in (a) of FIG. 6 by the charging and discharging operations of the charging structure 10. can

The AC voltage S1 is applied to the square wave generator 21 and a square wave signal S2 as shown in (b) of FIG. 6 may be output.

The square wave voltage signal S2 may be applied to the active line determiner 30 .

In addition, the AC voltage S1 output from the charging structure 10 may be applied to the full-wave rectifier 22, converted to DC voltage, and applied to the live wire determiner 30.

The full-wave rectifier 32 may full-wave rectify the AC voltage applied from the charging structure 10 to generate a DC voltage and output the DC voltage to the live wire determiner 30 .

The full-wave rectifier 32 may include at least one of a filter, a smoother, and a constant voltage circuit for stable output of DC voltage.

The live wire determiner 30 can measure the magnitude of the frequency of the voltage applied to the wire 100 using the square wave voltage S2 applied from the square wave generator 21, and determines whether or not the frequency of the power system is abnormal. It is possible to determine whether the state of the wire 10 is a live wire state in which electricity flows by using the AC voltage applied from the full-wave rectifier 22 .

At this time, the active line determiner 30 of this example can use the DC voltage applied from the full-wave rectifier 22 as a driving voltage, and in this case, a separate battery is not required.

As shown in FIG. 1 , such a live wire determiner 30 may include a controller 31 and a timer 32 .

The control unit 31 is a control module that controls the overall operation of the live wire determiner 30 and may be a processor.

In addition, the timer 32 counts the times of the (+) state and the (-) state of the applied square wave voltage S2, respectively, calculates the magnitude of the frequency, and sends the calculated magnitude of the frequency to the control unit 31. can be printed out.

Therefore, when the DC voltage is applied from the full-wave rectifier 22 to the active circuit determiner 30, the operation of the live circuit determiner 30 starts, and the operation of the control unit 31 and the timer 32 may also start.

For this reason, the control unit 31 can output a driving signal to the indicator 40 by determining the state of the lead 100 as a live wire state according to the application state of the applied DC voltage. Accordingly, the indicator 40 may display a pre-determined character (eg, 'currently energized').

By displaying the letters of the indicator 40, a worker located near the corresponding conductor 100 can recognize that the conductor 100 is in a dangerous state where electricity is currently flowing.

Also, as described above, the timer 32 may count the time between the (+) state and the (-) state of the square wave voltage applied from the square wave generator 21 and output the counted time to the controller 31.

Accordingly, the control unit 32 may calculate the frequency level of the current conductor 100 using the counting time applied from the timer 32 .

Then, when the calculated frequency size is less than or equal to the set value, it can be determined that an abnormality has occurred in the frequency of the voltage applied to the power system including the current conductor 100 . Accordingly, the control unit 31 may turn on the light emitting unit 50 to externally display the frequency abnormal state. The light emitting unit 50 may be a light emitting diode (LED). At this time, the setting size of the frequency may be stored in a memory not shown.

In an alternative example, the light emitting unit 50 may be omitted, and in this case, the control unit 31 may display predetermined letters (eg, 'frequency check required') on the indicator 40 .

However, if the state of the lead wire 100 to which no voltage is applied to the lead wire 100 is a non-live wire state, when no voltage is applied to the live wire determiner 30 from the full-wave rectifier 22, the live wire determiner ( 30) The indicator 40 and the light emitting unit 50 do not operate because their operation is not performed.

As already described, in this example, the controller 31 determines whether the lead wire 100 is live by using whether or not the voltage from the full-wave rectifier 22 is applied.

However, unlike this, the control unit 31 is connected to the square wave generator 21 and can determine whether the lead wire 100 is live depending on whether the square wave signal S2 is applied from the square wave generator 21 .

Accordingly, the control unit 31 may determine the live wire state of the lead wire 100 using a signal applied from the square wave generator 21 or the full wave rectifier 22 .

In this example, the controller 31 includes at least one of a CPU (central processing unit or CORE), a ROM, a RAM, an IO port, an analog-to-digital converter (ADC), a timer (TIMER), and a counter (COUNTER). It can be configured using an MCU having one or a 555 series (NE555, LM555, TS555, LMC555, CSS555, etc.) timer IC.

As already described, the indicator 40 is connected to the active line determiner 30 and can display corresponding characters under the control of the live line determiner 30. The display device 40 may include a light emitting diode, a 7-segment display, or a liquid crystal display (LCD).

In order to form a square wave, which is a driving signal, such an indicator 40 uses an interface (eg, an LCD interface) provided in the live wire determiner 30, or a timer IC (TIMER IC), a transistor (TR, FET) or logic IC (LOGIC IC).

As shown in FIG. 1, the charging structure 10 maintains a standby ground state located in the air without being connected to the ground. However, unlike this, the (-) terminal of the charging structure 10 may have a ground ground state connected to the ground using a separate ground line. In this case, grounding performance of the active line display device 1 may be improved, and safety of the active line display device 1 may be further improved.

In an alternative example, a battery may be additionally provided. In this case, the live wire determiner 30 may use a voltage supplied from any one of the full-wave rectifier 22 and the battery as a driving power source.

At this time, the live wire determiner 30 may be electrically connected to a component outputting a large voltage among the full-wave rectifier 22 and the battery to receive a corresponding voltage. To this end, the full-wave rectifier 22 and the battery are connected in parallel, and each output terminal is connected to the live wire determiner 30, respectively, so that power can be supplied to the live wire determiner 30. Then, by connecting a diode or a component (regulator ic, dc-dc converter) that converts and generates power between the output terminal of the full-wave rectifier 22 and the output terminal of the battery, the output from one of the full-wave rectifier 22 and the battery The voltage can be used as a driving power source for the live line determiner 30.

In this way, when the battery is additionally configured, the control unit 31 of the live wire determiner 30 uses a signal output from the square wave generator 21 instead of the full wave rectifier 22 to determine whether the corresponding lead wire 100 is live. The DC voltage output from the full-wave rectifier 22 can also be used for determining the live wire using the driving power of the live wire determiner 30 or a state in which power is applied.

In this example, the square wave generator 21 may be omitted when determining the live wire using a state in which power is applied, and in this case, an additional battery is selectively used.

Next, referring to FIGS. 2 and 3 , the filling structure 10 according to the present example will be described.

The charging structure 10 of this example may include a multilayer printed circuit board having a plurality of conductive layers. In this case, the number of conductive layers may be an even number.

Accordingly, as shown in FIG. 2 , the charging structure 10 may be, as an example, a 4-layer printed circuit board (PCB) having 4 conductive layers.

Therefore, the charging structure 10 of this example includes the first insulating layer 111 to the fifth insulating layer 115 sequentially positioned from the top to the bottom, and two adjacent insulating layers 111-112, 112-113, 113- 114, 114-115), the odd-numbered conductive layers 121-123 among the first to fourth conductive layers 121-124, and the conductive layers 121-124 alternately adjacent in the vertical direction A plurality of first via holes 131 physically and electrically connecting, and a plurality of physically and electrically connecting even-numbered conductive layers 122-124 among conductive layers 121-124 alternately adjacent in the vertical direction. A second via hole 132 may be provided.

In this way, since the charging structure 10 of the present example is composed of a multi-layer printed circuit board on which an electrical and electronic circuit mounting operation is performed, the power generator 20, the live wire determiner 30, the indicator 40, and the light emitter 50 ) Other components of the present example, such as may be mounted on the charging structure 10 and positioned. As a result, since a separate printed circuit board for mounting the power generator 20, the live wire determiner 30 and the indicator 40 is not required, the manufacturing cost and size of the live wire display device 1 of this example are greatly reduced. can do.

Each of the conductive layers 121 to 124 is made of a conductive material such as copper (Cu) or gold (Au), and as shown in FIG. 3, each conductive layer 121 to 124 has the same structure except for the arrangement position. can have In the case of this example, it may have a plate shape having a rectangular planar shape.

Accordingly, each of the insulating layers 111 to 115 completely covering the upper and lower portions of the conductive layers 121 to 124 located above or below the conductive layers 121 to 124 in contact with each other also has a rectangular planar shape. It may have a plate shape with

The insulating layers 112-114 positioned in the middle of the charging structure 10 insulate the two adjacent conductive layers 121-122, 122-123, and 123-124, respectively, and separate the conductive layers 121-124. It can function as a support layer for support.

In addition, the first insulating layer 111 located at the top serves to protect the first conductive layer 121 located at the bottom from the outside, and the fifth insulating layer 115 located at the bottom is also located at the top. The fourth conductive layer 124 may be covered and protected.

Therefore, each conductive layer 121 to 124 is formed by printing a conductive material such as copper in a desired pattern on a circuit board having an insulating property, and each insulating layer 112 to 114 may be formed on a circuit board having an insulating property. have. Then, the remaining insulating layers 111 to 115 may be formed by coating a conductive material on the upper surface of the first conductive layer 121 and the lower surface of the fourth conductive layer 124 that are exposed to the outside.

Due to this, one insulating layer and one conductive layer printed on the insulating layer can constitute one printed circuit board. In this case, the printed circuit board located at the top and bottom may additionally have an insulating layer on the surface exposed to the outside as described above.

In this example, the circuit board constituting the insulating layers 112 to 115 may be a rigid circuit board or a flexible circuit board.

These circuit boards include paper phenol PCBs, glass based epoxy PCBs, glass cloth epoxy PCBs, Teflon PCBs, metal PCBs using metals such as aluminum, and flexible films using polyester or polyamide films. (flexible film) may be at least one of PCBs.

Therefore, when the circuit board is made of a rigid circuit board, the charging structure 10 may be a hard printed circuit board [Hard PCB (printed circuit board)], and when the circuit board is made of a flexible circuit board, the charging structure 10 is flexible. It may be a printed circuit board (Flexible PCB).

When the charging structure 10 is a flexible printed circuit board (Flexible PCB), the degree of freedom of installation can be increased regardless of the installation space.

The plurality of first via holes 131 are for connecting the plurality of conductive layers 121 and 123 located at odd numbers in the vertical direction, and the plurality of second via holes 132 are the plurality of conductive layers located at even numbers ( 122 and 124) are connected to each other in the vertical direction.

At this time, the plurality of first via holes 131 and the plurality of second via holes 131 and 132 may be positioned to face each other on opposite sides, and for this purpose, the corresponding sides facing each other (eg, the first side or Y axis side) (eg, along the Y-axis direction).

Therefore, in the case of this example, as shown in FIGS. 2 and 3, the plurality of first via holes 131 may be spaced apart along the side adjacent to the right edge of the filling structure 10 having a rectangular planar shape. And, the plurality of second via holes 132 may be spaced apart along a side adjacent to the left edge of the charging structure 10 .

At this time, in order to reduce the connection resistance with the corresponding conductive layers 121-123 and 122-124, the first via hole 131 and the second via hole 132 each have a second side intersecting the first side, which is the corresponding side (eg , X-axis side) (eg, along the X-axis direction) may be spaced apart from each other.

In this example, since the number of the first via hole 131 and the second via hole 132 located along the second side is two, respectively, the first via hole 131 and the first via hole 131 spaced apart along the first side The 2 via holes 132 may each have two via hole groups G131 and G132.

When the first conductive layer 121 is adjacent to the corresponding wire 100, the first conductive layer 121 is charged with (+) charge and the second conductive layer facing the first conductive layer 121 from the opposite side. (122) may be charged with (-) charge.

Accordingly, all conductive layers 123 physically connected to the first conductive layer 121 through the first via hole 131 are also charged with (+) charges, and through the second via hole 132, the second conductive layer ( 121) and all of the conductive layers 124 physically connected may also be charged with (-) charges. Accordingly, in the charging structure 10 , the first via hole 131 may function as a (+) terminal, and the second via hole 132 may function as a (−) terminal.

Due to the connection of the first via hole 131 and the second via hole 131, all the conductive layers 123 connected to the conductive layer 121 located closest to the conductive line 100 may have (+) polarity. The odd-numbered conductive layers 121 and 123 may have (+) polarity, and the odd-numbered conductive layers 121 and 123 and the even-numbered conductive layers 122 and 124 facing each other on opposite sides have (-) polarity. can have

In this way, by the plurality of conductive layers 121 to 124 stacked in the vertical direction, the charging structure 10 may include at least one capacitor (eg, two capacitors), and each capacitor may include a conductive wire. The charging operation and the discharging operation can be performed by the AC voltage applied to (100).

By the charging and discharging operations of each capacitor formed in the charging structure 10, an AC voltage is applied to the power generator 20, and the square wave generator 21 outputs a square wave signal S2 and the full-wave rectifier 22 will output a direct current voltage.

Therefore, as described above, the control unit 31 of the live wire determiner 30 determines whether the lead 100 is in a live wire state and when the wire 100 is in a live wire state, the magnitude of the frequency of the voltage applied to the power system to determine whether the frequency is abnormal. can judge

Next, another example of the charging structure 10a according to the present embodiment will be described with reference to FIGS. 4 and 5 .

In comparison with FIGS. 2 and 3, the same reference numerals are given to components having the same structure and performing the same functions, and detailed descriptions thereof are omitted.

The charging structure 10a of the present example also physically and electrically connects an even number of conductive layers 121a to 124a, a plurality of insulating layers 11 to 15, and a plurality of conductive layers 121a to 123a 122a to 124a having the same polarity. A plurality of first via holes 131 and a plurality of second via holes 132 may be provided.

However, each conductive layer 121 to 124 in FIGS. 2 and 3 has a rectangular planar shape, whereas each conductive layer 121a to 124a in this example may have a comb type.

At this time, accordingly, each of the conductive layers 121a to 124a is connected to the connection portion 1211 extending along the first direction (eg, the Y-axis direction) and the connection portion 1211 to intersect the first direction (eg, the second direction) , X-axis direction) may be provided with a plurality of comb portions 1212 extending along.

In this case, the plurality of comb portions 1212 extending from the same connection portion 1211 may be spaced apart from each other in the first direction.

The comb part 1212 may have a structure in which (+) polarity and (-) polarity are symmetrical to maximize charging efficiency, and the width and spacing of the printed circuit board are adjusted to adjust the voltage generated according to the amount of charge to be charged. , It can be shaped by adjusting at least one of the size and thickness.

For example, when the induced charging voltage is higher than the breakdown voltage of the circuit, the width of the comb portion 1212 is reduced or the gap is widened so that the induced voltage can be reduced. Conversely, when the induced charging voltage is low, the size of the printed circuit board on which the comb portion 1212 is positioned is increased, and the interval between the comb portion 1212 is made denser so that the induced voltage can be increased.

As shown in FIG. 5, the first via hole 131 and the second via hole 132 are located in the connection part 1211 so that the conductive layers 121a-123a and 122a-124a having the same polarity can be connected to each other. .

The conductive layers 121a - 122a and 123a - 124a positioned adjacent to each other and connected to different via holes 131 and 132 may have left-right inversion shapes. Accordingly, the conductive layers 121a to 123a and 122a to 124a having the same polarity may be disposed in the same form.

In this way, except for the shape of each conductive layer 121a to 124a patterned on each corresponding insulating layer, the charging structure 10a of this example may have the same structure as the old conductor 10 of FIGS. 2 and 3 .

In general, when current flows and a magnetic field is generated, eddy current loss occurs due to eddy current.

However, as in this example, as the structure of each conductive layer 121a to 124a is implemented in a comb shape and the conductor is divided into several conductors, the range of occurrence of eddy currents generated in each conductive layer 121a to 124a can be greatly reduced. . Due to the decrease in the generation range of the eddy current, an effect of significantly reducing eddy current loss caused by a magnetic field induced in each of the conductive layers 121a to 124a may additionally occur.

In this case, the loss amount of the voltage applied to the live wire determiner 30 is also reduced due to the eddy current, so that an additional effect of improving the reliability of the live wire determiner 30 may occur.

The technical features disclosed in each embodiment of the present invention are not limited to the corresponding embodiment, and unless incompatible with each other, the technical features disclosed in each embodiment may be merged and applied to other embodiments.

In the above, the embodiments of the present invention have been described. The present invention is not limited to the above-described embodiments and accompanying drawings, and various modifications and variations will be possible from the viewpoint of those skilled in the art in the field to which the present invention belongs. Therefore, the scope of the present invention should be defined by not only the claims of this specification but also those equivalent to these claims.

100: lead wire 10, 10a: charging structure
20: power generator 21: square wave generator
22: full-wave rectifier 30: live wire determiner
31: control unit 32: timer
40: indicator 50: light emitting unit

Claims (10)

A charging structure made of a multi-layered printed circuit board, in which charging and discharging operations are performed by a voltage applied to adjacent conductors;
a full-wave rectifier connected to the charging structure and converting the AC voltage applied from the charging structure into a DC voltage and outputting the converted DC voltage;
a live wire determiner connected to the full-wave current unit and starting to operate using the DC voltage applied from the full-wave rectifier as a driving power source and determining the state of the wire as a live wire when DC voltage is applied from the full-wave rectifier; and
An indicator connected to the live wire determiner to display the live wire state
A live line display device including a. According to claim 1,
The filling structure,
a plurality of insulating layers each composed of a circuit board and stacked in a vertical direction;
a plurality of conductive layers located on each of the plurality of insulating layers and stacked in a vertical direction;
a first via hole connecting odd-numbered conductive layers among the plurality of conductive layers; and
A second via hole connecting even-numbered conductive layers among the plurality of conductive layers
A live line display device including a. In paragraph 2,
Each conductive layer has a plate shape having a rectangular planar shape. in paragraph 2
Each conductive layer,
a connecting portion extending in the first direction;
A plurality of comb portions extending spaced apart from each other in a second direction intersecting the first direction from the connecting portion
A live line display device including a. in paragraph 2
The circuit board is a rigid circuit board or a flexible circuit board. According to claim 1,
A square wave generator connected to the charging structure and outputting a square wave signal using an AC voltage applied from the charging structure.
A live line display device further comprising a. According to claim 6,
The live wire determiner calculates the frequency magnitude by counting the (+) and (-) state signals of the square wave signal applied from the square wave generator, and when the calculated frequency magnitude is less than or equal to the set magnitude, the voltage applied to the wire A live line display device that judges the frequency state of the system as an abnormal state. According to claim 7,
and a light emitting unit connected to the live wire determiner and turned on when a frequency state of the voltage applied to the conducting wire is in an abnormal state. According to claim 1,
The live wire display device wherein the charging structure is grounded to the air or grounded to the ground. According to claim 1,
The full-wave rectifier, the live-line determiner, and the indicator are located in the charging structure.

Images