KR20130029975A - Apparatus for stray electric field energy harvesting and supplying electric power of sensor network - Google Patents

Apparatus for stray electric field energy harvesting and supplying electric power of sensor network Download PDF

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Publication number
KR20130029975A
KR20130029975A KR1020110093433A KR20110093433A KR20130029975A KR 20130029975 A KR20130029975 A KR 20130029975A KR 1020110093433 A KR1020110093433 A KR 1020110093433A KR 20110093433 A KR20110093433 A KR 20110093433A KR 20130029975 A KR20130029975 A KR 20130029975A
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South Korea
Prior art keywords
power line
conductor
voltage
power supply
line
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KR1020110093433A
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Korean (ko)
Inventor
김호성
강성묵
박경진
장근수
신승환
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중앙대학교 산학협력단
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Publication of KR20130029975A publication Critical patent/KR20130029975A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

PURPOSE: A stray electric field energy harvesting device and a power supply device of a sensor network based on a stray electric field energy harvesting are provided to supply power to a wireless sensor node by harvesting electric field energy. CONSTITUTION: A conductor part(110) surrounds the outside of a power line(100) and occupies a preset area of the insulated power line. A harvesting circuit unit(150) rectifies a voltage generated by a stray capacity and stores the rectified voltage. The stray capacity is generated between the power line and the conductor part.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a power supply apparatus for a sensor network based on a stray field energy harvesting apparatus, a stray field energy harvesting apparatus,

TECHNICAL FIELD The technical field relates to sensor stray field energy harvesting devices, power supply devices of sensor networks.

Recently, as the field of ubiquitous wireless sensor network (USN) has developed, many sensors have been installed in various places such as streets, houses, buildings, automobiles to realize 'Smart environments'. From smart home system based on communication distance of several meters to structure health monitoring system based on communication distance of tens of meters, tens to hundreds of wireless sensors are installed and information is collected and transmitted .

Generally, a power source of various wireless sensor nodes constituting such a wireless sensor network is obtained from a power line of 220V. Additional devices such as SMPS are needed to extract the DC voltage needed to drive the wireless sensor nodes on the 220V power line. Therefore, many wireless sensor nodes use the battery as a power source device in which the additional device is not required.

However, a battery used by a plurality of wireless sensor nodes has a problem that needs to be replaced at regular intervals depending on whether the battery is discharged.

The present invention provides a device for harvesting electric field energy by wrapping a conductor on a power line.

The present invention also provides a harvested field energy to the sensor node, to provide an apparatus for use as a power source of the wireless sensor node.

In another aspect, the present invention provides a device that can determine whether the power line is energized in accordance with the harvested field energy.

According to embodiments of the present invention, the conductor portion surrounding the outer periphery of the power line to occupy a predetermined area of the power line; And a harvesting circuit unit for rectifying the voltage generated by the stray capacitance generated between the power line and the conductor unit, and storing the rectified voltage.

The harvesting circuit unit is a rectifying unit for converting an AC voltage generated by the stray capacitance generated between the power line and the conductor into a DC voltage, energy for storing the rectified DC voltage and providing the stored DC voltage to the sensor node. It may include an accumulator.

The energy storage unit may be a capacitor having a storage capacity of DC voltage to be provided to the sensor node.

The charging voltage of the energy accumulator may be proportional to an area of the conductor surrounding the power line.

The conductor unit may generate stray capacitance for each of a hot line and a ground line of the power line.

The conductor portion may be configured to surround the outer circumference of the power line in a cylindrical shape.

The conductor unit may include a first conductor that generates the live wire and the first stray capacitance C 1 , and a second conductor that generates the ground line and the second stray capacitance C 2 of the power line.

The conductor portion may be configured to cover a part of the outer circumferential surface of the power line with a predetermined length and area.

The ground of the harvesting circuit part may be a plate ground to which a thin metal plate is connected.

The present invention also relates to a plate-shaped conductor portion covering a portion of an insulated coated power line including a live wire and a ground wire, and a voltage generated by the first stray capacitance C1 and the second stray capacitance C2 generated between the power line and the conductor. Rectifier for rectifying the energy storage unit for storing the rectified voltage, and providing the stored voltage to the sensor node.

The conductor unit may include a first conductor generating a live line and a first stray capacitance of the power line, and a second conductor generating a ground line and a second stray capacitance of the power line.

In another aspect, the present invention is a conductor portion surrounding a portion of the power line except the portion of the power line attached or buried, rectification unit for rectifying the voltage generated by the stray capacitance generated between the power line and the conductor portion, the rectified And an energy accumulator for storing the voltage and providing the stored voltage to the sensor node.

In another aspect, the present invention provides a sensor node constituting a sensor network, a power supply unit for receiving a voltage generated and charged through a power line, a conductor unit wound around the power line and a harvesting circuit unit, and providing the charged voltage to a sensor; A sensor unit for collecting sensor data, and a transmission unit for transmitting the collected data to the data collection unit every predetermined time.

In another aspect, the present invention charges the voltage generated by the conductor portion surrounding the outer periphery of the power line to occupy a predetermined area of the power line, the stray capacitance generated between the power line and the conductor portion, the power line according to the charged voltage value It includes an energization detecting unit for determining whether or not the electricity.

The energization detecting unit is a harvesting circuit for charging a voltage generated by the stray capacitance generated between the power line and the conductor unit, a memory unit for storing the energizing voltage value according to the charged voltage value, according to the charged voltage value It may include a control unit for determining the energized voltage value.

The energization sensing unit may further include a display unit for displaying an energizing voltage value according to the charged voltage value.

The harvesting circuit unit is a rectifying unit for converting the AC voltage generated by the stray flux generated between the power line and the conductor into a DC voltage, storing the rectified DC voltage, and providing the stored DC voltage to the sensor node It may include an energy accumulator.

The conductor portion may be configured to surround the outer circumference of the power line in a cylindrical shape.

The conductor part includes a plate-shaped first conductor and a second conductor covering a portion of the power line including the live wire and the ground wire, wherein the first conductor generates the live wire and the first stray capacitance of the power line, and the second conductor. May generate a ground line and a second stray capacitance of the power line.

The conductor part may be in the form of surrounding the power line except for a part attached to or embedded in the surface when a portion of the power line is attached or embedded in the surface.

According to embodiments of the present invention, a separate power applying device is not required at the sensor node of the wireless sensor network.

In addition, according to embodiments of the present invention, the installation position of the sensor node constituting the sensor network is not limited.

In addition, according to embodiments of the present invention, it is possible to easily check whether the power line is energized without removing the cover of the covered power line.

1 is a diagram illustrating an equivalent circuit for powering a sensor network according to an embodiment of the present invention.
2 is a view for explaining a mode of wrapping a conductor on a power line according to an embodiment of the present invention.
FIG. 3 is a graph showing an average power amount according to whether grounding of a harvesting circuit unit and grounding of a power line according to an embodiment of the present invention.
4 is a graph showing the average amount of power according to the ground connection state of the harvesting circuit unit according to an embodiment of the present invention.
5 is a graph illustrating an average amount of power according to a length of a conductor wound around a power line according to an embodiment of the present invention.
6 is a block diagram of a sensor node constituting a sensor network according to an embodiment of the present invention.
7 is a diagram for explaining a configuration for detecting whether or not a power line is energized according to another embodiment of the present invention.
FIG. 8 is a graph illustrating an energy collection amount using a fractal antenna according to another embodiment of the present invention.
FIG. 9 is a graph showing an energy collection amount according to a type of a fractal antenna according to another embodiment of the present invention.
10 is a graph showing the amount of collected energy according to the antenna according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an equivalent circuit for powering a sensor network according to an embodiment of the present invention.

Referring to FIG. 1, the present invention provides an energy collection device for providing a sensor node constituting a sensor network includes a power line 100, a conductor unit 110 surrounding the power line, and a harvesting circuit unit 150.

The power line 100 is an insulated-coated AC power line, for example, in the embodiment of the present invention, using a no-load AC power line that does not flow current connected to a household 220V outlet.

The conductor portion 110 is a conductor surrounding the power line, and an aluminum foil is used in the embodiment of the present invention.

The conductor unit 110 may have various shapes surrounding the power line according to the installation state or position of the power line 100. Various forms of the conductor portion 110 will be described in detail with reference to FIG.

When the aluminum foil is wound on the AC power line 100 in a cylindrical shape, stray capacitances C 1 and C 2 are generated between the hot line of the power line and the foil and between the ground line and the foil. When the stray capacitance C 1 and C 2 is applied to the AC power line 100, the voltage is distributed to the C 1 and C 2 capacitors to generate an AC voltage.

The harvesting circuit part 150 includes a rectifying part 152 and an energy accumulating part 154.

The rectifying unit 152 converts the AC voltage generated by the stray capacitance to a DC voltage. Although the rectifying unit 152 according to the embodiment of the present invention has been described by taking a full-wave rectifying circuit including two diodes as an example, various types of rectifying circuits may be applied.

The energy storage unit 154 stores the rectified DC voltage through the rectifying unit 152 and provides the stored DC voltage to the sensor node 160 constituting the sensor network. The energy storage unit 154 is a capacitor having a storage capacity of DC voltage to be provided to the sensor node 160.

2 is a view for explaining a mode of wrapping a conductor on a power line according to an embodiment of the present invention.

Referring to FIG. 2, according to an embodiment of the present invention, a conductor enclosing a power line may have various shapes according to the state or position of the power line.

2 (a) is an exemplary view showing a cylindrical wrap around the aluminum foil 110 in the power line 100. When the power line 100 is completely exposed, the outer circumference of the power line may be covered by the aluminum foil 110, which is a conductor, for a predetermined length.

2B illustrates a state in which the power line 100 is installed on a specific surface such as the wall 10 so that the power line 100 is covered with the conductor 111 when a part of the power line 100 is exposed Fig.

2C is an example of a form in which the conductor 1110 is covered on the outer periphery of the wall 10 in which the power line is embedded when the power line 100 is buried in a specific surface such as a wall .

When a part of the power line 100 is attached to or embedded in a wall, floor, or the like, as shown in the example of FIG. 2 (b), it is impossible to enclose the power line with a conductor as in the example of FIG. Therefore, when the power line is installed on the same surface as the wall and partially exposed, the outer circumference of the exposed power line may be covered with the aluminum foil 111 as a conductor.

2 (c), if the power line is buried and is not exposed to the outside, a conductor aluminum foil 111 may be formed on the outside of the surface to cover the power line.

The example of FIG. 2 (d) is an example in which the power line 100 is covered with a plurality of plate-like conductors 112a and 112b when the power line 100 is exposed. And may be configured to cover the plurality of plate-shaped conductors 112a and 112b by the upper and lower sides or the left and right sides of the power line 100, respectively.

As illustrated in FIG. 2, the conductor may have various shapes surrounding or covering the power line according to the position or state where the power line is installed.

In the embodiment of the present invention, the power line is wrapped or covered. However, the conductor may include a wire or an antenna.

3 is a graph showing an average power amount depending on whether a grounding of a harvesting circuit and a grounding connection of a power line according to an embodiment of the present invention.

Referring to FIG. 3, when the length of the aluminum foil 110 surrounding the power line 100 is fixed to 20 cm and the storage capacitor capacity of the energy storage unit 154 is changed, the graph shows the average amount of power changed.

The energy accumulator 154 is connected to the ground of the harvesting circuit unit 150 and the ground line 102 of the power line 100 while collecting the energy of the energy accumulator 154, You can collect about 900mA to make.

On the other hand, when the ground wire 102 of the power line 100 and the ground 156 of the harvesting circuit unit 150 are separated (Separate Ground, SG), 80 to 100 mA is collected.

The energy storage unit 154 is configured such that the ground 156 of the harvesting circuit unit 150 and the ground line 102 of the power line 100 are connected to each other. In the embodiment of the present invention, it is assumed that the ground of the power line 100 is the earth ground.

The amount of current stored in the energy accumulator 154 varies depending on the ground state of the harvesting circuit unit 150.

4 is a graph showing an average power amount according to a ground connection state of a harvesting circuit according to an embodiment of the present invention.

Referring to FIG. 4, in the embodiment of the present invention, when nothing is connected to the ground of the hoisting circuit part 150 (No Ground, NG), when it is connected only to general wire (Wire Ground, WG) For example, the plate ground (PG) is connected using a wire connected with a thin metal plate (3 * 4 cm).

As shown in the graph of FIG. 4, the average current amount collected in the NG state is 93 mA, and the average current in the WG state is 210 mA. However, in order to reduce the contact resistance by enlarging the contact surface with the ground such as the concrete floor, the average current of the PG state using the metal thin plate is 700 mA.

Therefore, when the ground line 102 of the power line 100 and the ground 156 of the harvesting circuit unit 150 are connected, the energy of the capacity corresponding to the energy to be transmitted to the sensor node can be collected.

5 is a graph illustrating an average current amount according to a length of a conductor wound around a power line according to an embodiment of the present invention.

Referring to FIG. 5, it is an average current amount when the length of the foil wound around a 220V power line is varied by using a PG circuit.

As the length of the foil wound on the power line 100 increases, the average amount of current that can be accumulated in the energy storage unit 156 increases. The length of the foil is 60 cm, and the amount of current accumulated in the energy accumulating unit 154 is the highest. Therefore, the amount of current also increases according to the length or the area of the foil wound around the power line 100. [

6 is a block diagram of a sensor node constituting a sensor network according to an embodiment of the present invention.

Referring to FIG. 6, the sensor node 600 according to an embodiment of the present invention includes a power supply unit 610, a sensor unit 620, a memory unit 630, a controller 640, and a transmitter 650. do.

The power supply unit 610 provides the sensor unit 620 with a power line wrapped around the aluminum foil and a charging voltage received from the harvesting circuit 150.

The sensor unit 620 collects sensor data using the power supplied from the power supply unit 610. The sensor unit 620 may include various sensors such as a temperature sensor, an ambient light sensor, and a humidity sensor.

The memory unit 630 stores the sensor data collected by the sensor unit 620.

The control unit 640 stores the sensor data collected through the sensor unit 620 in the memory unit 630. The control unit 640 transmits the sensor data stored in the memory unit 630 to the destination for collecting the sensor data at predetermined time intervals or every predetermined period through the transfer unit 650. [

7 is a diagram for explaining a configuration for detecting whether or not a power line is energized according to another embodiment of the present invention.

7, in another embodiment of the present invention, a conductor 710 that surrounds the outer circumference of the power line 700 to occupy a predetermined area of the power line 700 and the power line 700, And an energization detecting unit 750 for confirming whether or not the power is on.

As shown in FIG. 2, the conductor portion 710 may have various shapes depending on the installation type and location of the power line 700.

The energization detecting unit 750 includes a harvesting circuit unit 752, a control unit 754, a memory unit 756, and a display unit 758.

The harvesting circuit portion 752 includes a rectifying portion and an energy storing portion like the harvesting circuit of the embodiment of the present invention described above. Accordingly, in the rectifying part, the AC voltage is rectified to the DC voltage according to the stray capacitance generated between the power line 700 and the conductor part 710, and the rectified voltage is charged in the energy accumulating part.

The memory unit 756 stores the energizing voltage value according to the stored voltage value in the harvesting circuit unit 752. [

The control unit 754 compares the voltage value charged in the harvesting circuit unit 752 with the value of the energizing voltage stored in the memory unit 756. The control unit 754 determines whether or not the power line is energized according to the comparison result.

For example, if the voltage value stored in the harvesting circuit is 5V, the voltage value applied to the power line 700 is determined to be 220V. Also, when the charged voltage value is lower than the reference value, it is determined that the power line is not energized.

The display unit 758 displays whether or not the power line is energized and the voltage value to be energized according to the determination result of the controller 754.

FIG. 8 is a graph illustrating an energy collection amount using a fractal antenna according to another embodiment of the present invention.

Referring to FIG. 8, a fractal antenna according to another embodiment of the present invention exhibits a change amount as the energy collection time increases or decreases in a 100 nF capacitor.

8 (a) shows the energy collection amount of the speared ground 2 diode (SG2D) circuit using the fractal antenna. (a) In the graph, the amount of energy collected using the first flectal antenna, the amount of energy collected using the second flectal antenna, and the energy collected using the lead wire (85 cm) for a predetermined time (5 min) .

The graph of FIG. 8 (b) shows the energy collection amount of the ground 2 diode (G2D) circuit using the fractal antenna. (b) In the graph, the amount of energy collected using the first flectal antenna for a predetermined time (2 min), the amount of energy collected using the second flectal antenna, and the general wire antenna (85 cm) Represents the amount of energy.

The first and second flectal antennas may be configured such that the number of radiators constituting the antenna is different. In the embodiment of the present invention, the second flectal antenna will be described as an example where the number of radiators constituting the antenna is larger than that of the first flectal antenna.

Therefore, as shown in the graphs (a) and (b), the amount of energy collected by the fractal antenna is greater than that of the lead antenna. In addition, in the first and second flectal antennas, the second flectal antenna having a larger number of radiators has a higher energy collection amount than the first flectal antenna.

FIG. 9 is a graph showing an energy collection amount according to a type of a fractal antenna according to another embodiment of the present invention.

Referring to FIG. 9, the graph of FIG. 9 is a graph showing an energy collection amount using a hard flectal antenna illustrated in FIG. 8 and an energy collection amount using a flexible fractal antenna.

Shows the amount of energy change when the time of stray energy collection amount is increased in a 100 nF capacitor using a hardflectal antenna and a flexible antenna having the same type of fractal antenna structure.

As a result, the amount of energy that the flexible antenna collects for a predetermined time is larger than that of the conventional hardflective antenna. Even when the flexible antenna is bent, it appears that it can collect energy similar to the expanded state.

10 is a graph showing the amount of collected energy according to the antenna according to the embodiment of the present invention.

Referring to FIG. 10, the graph of FIG. 10 shows the amount of stray energy collected for a predetermined period of time using a flexible flexible antenna, a flexible flexible antenna, a hard fractal antenna, a lead antenna, and a TV antenna.

As shown in FIG. 10, the flexible fractal antenna indicates that the stray energy collection amount for the predetermined time is the highest. Also, it is shown that the antennas having a broad band of the fractal have a higher amount of stray energy to be collected.

Therefore, the collection of stray energy may be different depending on the state or kind of the conductor. While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

Claims (20)

A conductor part surrounding an outer circumference of the power line so as to occupy a predetermined area of the insulation coated power line;
A harvesting circuit unit for rectifying the voltage generated by the stray capacitance generated between the power line and the conductor unit and storing the rectified voltage;
The power supply of the sensor network. The method of claim 1,
The harvesting circuitry
A rectifier for converting an AC voltage generated by stray capacitance generated between the power line and the conductor into a DC voltage;
An energy accumulator for storing the rectified DC voltage and providing the stored DC voltage to the sensor node;
The power supply of the sensor network. The method of claim 2,
The energy accumulator
And a capacitor having a storage capacity of a DC voltage to be provided to the sensor node.
The power supply of the sensor network. The method of claim 2,
The charging voltage of the energy storage unit is proportional to the area of the conductor surrounding the power line.
The power supply of the sensor network. The method of claim 1,
The conductor part
Generating stray capacitance for each of the hot line and the ground line of the power line.
The power supply of the sensor network. The method of claim 1,
The conductor part
The power supply device of the sensor network surrounding the outer periphery of the power line in a cylindrical shape. The method of claim 1,
The conductor part
And a first conductor generating the live line and the first stray capacitance C 1 of the power line, and a second conductor generating the ground line and the second stray capacitance C 2 of the power line.
The power supply of the sensor network. The method of claim 1,
The conductor part
And a power supply device of the sensor network covering the outer circumferential surface of the power line to have a predetermined length and an area. The method of claim 1,
The grounding of the harvesting circuit portion is
The power supply of the sensor network, characterized in that the metal plate is connected to the ground (Plate Ground). A plate-shaped conductor portion covering a portion of the insulated coated power line including a live wire and a ground wire;
A rectifier for rectifying the voltage generated by the first stray capacitance C1 and the second stray capacitance C2 generated between the power line and the conductor;
An energy accumulator for storing the rectified voltage and providing the stored voltage to a sensor node;
The power supply of the sensor network. The method of claim 10,
The conductor part
A first conductor generating a live line and a first stray capacitance of the power line and a second conductor generating a ground line and a second stray capacitance of the power line
The power supply of the sensor network. A conductor portion surrounding a portion of the power line except for a portion where the power line is attached or buried in a predetermined surface;
A rectifier for rectifying the voltage generated by the stray capacitance generated between the power line and the conductor portion;
An energy accumulator for storing the rectified voltage and providing the stored voltage to a sensor node;
The power supply of the sensor network. A sensor node constituting a sensor network,
A power supply unit configured to receive a voltage generated and charged through a power line, a conductor unit wound around the power line, and a harvesting circuit unit, and provide the charging voltage to a sensor;
A sensor unit for collecting sensor data;
A transmitter for transmitting the collected data to a data collector every predetermined time;
The power supply of the sensor network. A conductor part surrounding an outer circumference of the power line so as to occupy a predetermined area of the power line;
An energization detector configured to charge a voltage generated by stray capacitance generated between the power line and the conductor, and determine whether the power line is energized according to the charged voltage value;
Power supply comprising a. 15. The method of claim 14,
The energization sensing unit
A harvesting circuit for charging a voltage generated by the stray capacitance generated between the power line and the conductor portion;
A memory unit for storing an energizing voltage value according to the charged voltage value;
A controller for determining an energized voltage value according to the charged voltage value;
Power supply comprising a. 16. The method of claim 15,
The energization sensing unit
A display unit for displaying an energizing voltage value according to the charged voltage value,
Further comprising: 16. The method of claim 15,
The harvesting circuitry
A rectifier for converting an AC voltage generated by stray flux generated between the power line and the conductor into a DC voltage;
An energy accumulator for storing the rectified DC voltage and providing the stored DC voltage to the sensor node;
Power supply comprising a. 15. The method of claim 14,
The conductor part
And a power supply line surrounding the outer periphery of the power line. 15. The method of claim 14,
The conductor part
It comprises a plate-shaped first conductor and a second conductor covering a portion of the power line including the live wire and ground wire,
The first conductor generates a live line and a first stray capacitance of the power line, and the second conductor generates a ground line and a second stray capacitance of the power line.
Power supply. 15. The method of claim 14,
The conductor part
When a part of the power line is attached to or embedded in the surface,
Power supply.
KR1020110093433A 2011-09-16 2011-09-16 Apparatus for stray electric field energy harvesting and supplying electric power of sensor network KR20130029975A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101476659B1 (en) * 2014-06-20 2015-01-02 중앙대학교 산학협력단 Wireless and batteryless temperature sensing device using stray electric field energy and temperature managing system using thereof
US20160204655A1 (en) * 2013-09-19 2016-07-14 Remoni Aps Energy Harvesting Device
KR20170109424A (en) * 2016-03-21 2017-09-29 이병선 Protect hose and electromagnetic waves harvesting system using the same
KR101861705B1 (en) * 2016-12-29 2018-05-29 중앙대학교 산학협력단 Non-intrusive voltage measurement equipment based on electric field energy harvesting
KR20180133228A (en) * 2017-06-05 2018-12-13 홍익대학교 산학협력단 Highly efficient self -powered wireless sensor and sensor module
KR102382729B1 (en) * 2021-07-21 2022-04-08 (주)더원에코파워텍 Energy harvesting wireless power on-line indicator and high voltage power facility having thereof
KR102382939B1 (en) * 2021-07-19 2022-04-08 유영희 Energy harvesting wireless electricity meter and high voltage power facility having thereof
KR20230030898A (en) * 2021-08-26 2023-03-07 임세희 Switchgear panel, busduct, transformer having cooling fan operated by electromagnetic energy harvester
KR20230030899A (en) * 2021-08-26 2023-03-07 임세희 Switchgear panel, busduct, transformer having pressure sensor operated by electromagnetic energy harvester

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160204655A1 (en) * 2013-09-19 2016-07-14 Remoni Aps Energy Harvesting Device
KR101476659B1 (en) * 2014-06-20 2015-01-02 중앙대학교 산학협력단 Wireless and batteryless temperature sensing device using stray electric field energy and temperature managing system using thereof
KR20170109424A (en) * 2016-03-21 2017-09-29 이병선 Protect hose and electromagnetic waves harvesting system using the same
KR101861705B1 (en) * 2016-12-29 2018-05-29 중앙대학교 산학협력단 Non-intrusive voltage measurement equipment based on electric field energy harvesting
KR20180133228A (en) * 2017-06-05 2018-12-13 홍익대학교 산학협력단 Highly efficient self -powered wireless sensor and sensor module
KR102382939B1 (en) * 2021-07-19 2022-04-08 유영희 Energy harvesting wireless electricity meter and high voltage power facility having thereof
KR102382729B1 (en) * 2021-07-21 2022-04-08 (주)더원에코파워텍 Energy harvesting wireless power on-line indicator and high voltage power facility having thereof
KR20230030898A (en) * 2021-08-26 2023-03-07 임세희 Switchgear panel, busduct, transformer having cooling fan operated by electromagnetic energy harvester
KR20230030899A (en) * 2021-08-26 2023-03-07 임세희 Switchgear panel, busduct, transformer having pressure sensor operated by electromagnetic energy harvester

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