KR101360971B1 - Wireless power transmission system in human body - Google Patents

Abstract

The present invention relates to an internal wireless power transfer system, wherein the internal wireless power transfer system includes an external electrode pair attached to a surface of a human body; A power source connected to the external electrode pair to supply power; An inner electrode pair disposed on a surface of the body receiving device which is located inside the human body and receives power from the outside, and forms an electric field and a capacitive coupling formed inside the human body by the outer electrode pair; And a load connected between the inner electrode pairs to receive a potential.

Description

In-Wire Wireless Power Transmission System {WIRELESS POWER TRANSMISSION SYSTEM IN HUMAN BODY}

The present invention relates to a wireless power transmission system in the body, in particular to form an electric field inside the human body through an electrode pair outside the human body to wirelessly supply power to a device located in the body through an electrode pair installed in the device located in the body The present invention relates to a technique for supplying power by capacitively coupling an electric field.

The present invention was derived from the Human Cognition and Environmental Business Division of the Ministry of Education, Science and Technology-a research conducted as part of a new technology convergent growth engine project [Project Number: 2011K000662, Project Name: Development of high-speed human body communication and human body power transmission technology] .

As awareness and importance of health care increase, development of a technique for acquiring various biological information using a device inserted into the body and using it for treatment is being activated.

Devices inserted into the body are not powered from the outside by their characteristics, they are powered by a battery installed inside the device. However, in order for the device inserted into the body to operate for a long time, the battery must be charged periodically by receiving power from the outside of the human body.

As a method for supplying power to a device located in the body, a coil pair is installed in a power transmission device outside the human body and a reception device located in the body, and a technique using a resonance phenomenon occurring in a low frequency band is used.

However, in this case, if the arrangement direction of the transceiver is slightly changed, the coil is out of the resonance state, and thus the efficiency of power transmission is drastically reduced. Therefore, there is a limitation that the technique using the resonance phenomenon cannot be applied to a device moving inside the human body, such as a capsule endoscope.

In addition, since the coil pairs must be installed in each of the transmitting and receiving devices, there are disadvantages in that a plurality of coil pairs must be installed for each device when a plurality of devices are inserted into the human body.

United States Patent US 6754472, 2004.06.22.

Therefore, in the art, there is a need for an efficient power transmission for a mobile device including a stationary device by forming an electric field inside the human body, and a method for easily transmitting power to a plurality of devices.

In order to solve the above problems, an embodiment of the present invention provides an internal wireless power transmission system. The internal wireless power transmission system, the external electrode pair is attached to the surface of the human body; A power source connected to the external electrode pair to supply power; An inner electrode pair disposed on a surface of the body receiving device which is located inside the human body and receives power from the outside, and forms an electric field and a capacitive coupling formed inside the human body by the outer electrode pair; And a load connected between the inner electrode pairs to receive a potential.

In this case, the external electrode pair may be attached to face the front or back or both sides of the human body, the internal electrode pair may be installed on two opposite surfaces of the body receiving device.

In addition, the inner electrode pair may include a plurality of inner electrode pairs, and in this case, a switch for selecting one inner electrode pair among the plurality of inner electrode pairs; And a potential measuring comparator for measuring a potential of the internal electrode pair selected by the switch and comparing the measured potential with a previously measured potential.

In this case, the potential measuring comparator controls the switch to sequentially select the plurality of internal electrode pairs, measures the potential received from each of the internal electrode pairs, and compares the measured potential with the maximum of the plurality of internal electrode pairs. A switch control signal for selecting an internal electrode pair for receiving a potential can be output.

In addition, the potential measuring comparator outputs a switch control signal for selecting internal electrode pairs for receiving the maximum potential among the plurality of internal electrode pairs by performing potential measurement and comparison with respect to the plurality of internal electrode pairs at predetermined periods. can do.

In addition, when a plurality of internal receiving devices are located inside the human body, each internal receiving device may simultaneously receive power from an electric field formed inside the human body through each pair of internal electrodes installed on the surface.

In addition, the means for solving the above-mentioned problems are not all enumerating the features of the present invention. The various features of the present invention and the advantages and effects thereof will be more fully understood by reference to the following specific embodiments.

The electric field is formed inside the human body through the electrode pair outside the human body, and the electric field is capacitively coupled through the electrode pair installed in the device located inside the body, so that efficient power transmission is possible even for the device moving inside the human body and easy for many devices. An internal wireless power transfer system capable of one power transfer may be provided.

1 illustrates an electrode pair attached to a surface of a human body and a power source connected thereto for power transmission according to an embodiment of the present invention;
2 is a view showing the structure of the electric field distribution and the internal receiving device formed inside the human body by an electrode pair attached to the surface of the human body according to one embodiment of the present invention;
3 is a view showing a structure in which a plurality of electrode pairs are provided in an internal receiving device according to another embodiment of the present invention;
4 is a diagram showing a structure for selectively receiving a maximum potential when a plurality of electrode pairs are installed in a body receiving device according to another embodiment of the present invention; and
FIG. 5 is a diagram illustrating a structure for receiving power from an electric field formed in a human body when a plurality of internal receivers are located inside the human body according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

1 is a diagram illustrating an electrode pair attached to a surface of a human body and a power source connected thereto for power transmission according to an embodiment of the present invention.

Referring to FIG. 1, the external electrode pairs 121 and 122 are attached to a surface of a human body for power transmission according to an embodiment of the present invention, and the power source 110 is attached to the external electrode pairs 121 and 122. Connected.

When the power source 110 generates power to supply power through the external electrode pairs 121 and 122, a constant electric potential is generated between the points where the external electrode pairs 121 and 122 are located to form an electric field inside the human body. do.

Since the dielectric constant of the human body is very large compared to air, the amount of leakage of the electric field formed by the external electrode pairs 121 and 122 into the air is very small, and accordingly, the power supplied by the power source 110 is mostly transmitted into the human body. do.

In addition, in order to maintain the maximum potential between the points where the external electrode pairs 121 and 122 are located, the external electrode pairs 121 and 122 need to be installed to be spaced apart from each other as much as possible from the surface of the human body. To this end, the external electrode pairs 121 and 122 may be attached to the front, rear, or both sides of the body.

2 is a view showing the structure of the electric field distribution and the body receiving apparatus formed inside the human body by the electrode pair attached to the surface of the human body according to one embodiment of the present invention.

Referring to FIG. 2, an internal electric field 30 is formed inside the human body by external electrode pairs 121 and 122 attached to the surface of the human body, and is located in the human body to receive power from the outside. The inner electrode pairs 131 and 132 provided on the surface of the s) form a capacitive coupling with the electric field 30 formed inside the human body.

Here, the load 140 is connected between the pair of internal electrodes (131, 132) installed in the internal receiving device 20, through which receives a constant potential to receive power supplied from the outside.

In addition, like the external electrode pairs 121 and 122, the inner electrode pairs 131 and 132 need to be spaced apart from each other as much as possible in order to maximize the potential received through the load 140. To this end, the internal electrode pairs 131 and 132 may be installed on two opposite surfaces of the internal receiving device 20.

3 is a diagram illustrating a structure in which a plurality of electrode pairs are provided in an in-body receiving device according to another embodiment of the present invention.

Referring to FIG. 3, when the internal receiving device 20 has a hexahedral shape, each of the plurality of internal electrode pairs 131, 132, 133, 134, 135, and 136 may face two of the internal receiving devices 20. Can be installed on the cotton. Thus, as described above with reference to FIG. 2, the potential received by the load connected between the internal electrode pairs 131, 132, 133, 134, 135, and 136 may be maximized.

3 illustrates an example in which the internal receiving device 20 has a hexahedron shape, and an internal electrode pair 131 installed in the internal receiving device 20 according to the shape and surface area of the internal receiving device 20. The number and positions of the 132, 133, 134, 135, and 136 may be adjusted.

4 is a diagram showing a structure for selectively receiving a maximum potential when a plurality of electrode pairs are installed in an in-body receiver according to another embodiment of the present invention.

According to another embodiment of the present invention, when a plurality of internal electrode pairs 131, 132, 133, 134, 135, and 136 are installed in the internal receiving device 20, the internal receiving device 20 moves inside the human body. The direction of the body receiving device 20 with respect to the formed electric field may be changed. In this case, the potentials received by the internal electrode pairs 131, 132, 133, 134, 135, and 136 through the switch 150 and the potential measuring comparator 160 included in the internal receiving device 20 are compared. By selecting the largest potential, the received potential can be kept above a certain level.

Here, the switch 150 selects one internal electrode pair among the plurality of internal electrode pairs 131, 132, 133, 134, 135, and 136 through switching, and the potentiometer comparator 160 selects the selected internal electrode pair. A switch control signal 161 for outputting a switch control signal 161 for measuring internal potential and selecting an internal electrode pair having a maximum potential by comparing the measured potential with the previously measured potential.

More specifically, the potentiometer comparator 160 controls the switch 150 through the switch control signal 161 to sequentially select the respective internal electrode pairs 131, 132, 133, 134, 135, and 136, The potentials received from each of the internal electrode pairs 131, 132, 133, 134, 135, and 136 are measured and compared with the previously measured potentials.

The potentiometer comparator 160 selects and selects an internal electrode pair that receives the maximum potential when the potential measurement and comparison of all the internal electrode pairs 131, 132, 133, 134, 135, and 136 is completed. The control signal 161 is output to receive the electric potential through the control signal 161.

The internal reception apparatus 20 may prevent the sudden drop of the reception potential that may appear as the internal reception apparatus 20 moves by repeatedly performing the above-described process at predetermined intervals.

FIG. 5 is a diagram illustrating a structure for receiving power from an electric field formed in a human body when a plurality of internal receivers are located inside the human body according to another embodiment of the present invention.

Referring to FIG. 5, when a plurality of internal receiving devices 20, 21, 22 are located inside the human body, internal electrode pairs 131, 132, 133, and 134 are provided in the respective internal receiving devices 20, 21, 22. By installing the 135, 136 one by one, the plurality of internal receiving devices 20, 21, 22 can simultaneously receive power from an electric field formed inside the human body.

In this case, each internal receiver 20, 21, 22 may be provided with a plurality of internal electrode pairs as described above with reference to Figs. In addition, each internal receiving device 20, 21, 22 is provided with a separate switch and a potential measuring comparator, through which the potential received by each internal electrode pair can be compared to select the largest potential.

As described above, the present invention can be applied to a device moving within the human body as well as a device having a fixed position in the human body due to the small influence of the arrangement direction of the power transmission. In particular, by providing a plurality of internal electrode pairs and selecting an internal electrode pair that receives the largest potential, the reception potential can be maintained above a certain level.

In addition, even when a plurality of devices are inserted into the human body, a plurality of devices can receive power at the same time by installing the inner electrode pairs in each device without having to install a separate external electrode pair for each device.

The present invention is not limited to the above-described embodiments and the accompanying drawings. It will be apparent to those skilled 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.

10: human body
20, 21, 22: internal receiver
30: electric field
110: power source
121, 122: external electrode pair
131, 132, 133, 134, 135, 136: internal electrode pair
140: load
150: Switch
160: potential measurement comparator

Claims (8)

An external electrode pair attached to the surface of the human body;
A power source connected to the external electrode pair to supply power;
A plurality of internal electrode pairs which are located on the inside of the human body and are installed on the surface of the internal receiving device that receives electric power from the outside, and form an electrical field and a capacitive coupling formed by the external electrode pairs in the human body;
A plurality of loads respectively connected between the plurality of internal electrode pairs to receive a potential;
A switch for selecting one inner electrode pair among the plurality of inner electrode pairs; And
And a potential measuring comparator for measuring a potential for an internal electrode pair selected by the switch and comparing the measured potential with a previously measured potential.
The method of claim 1,
The external electrode pair is a body wireless power transmission system is attached to face the front and back or both sides of the human body.
The method of claim 1,
And the plurality of internal electrode pairs are installed on two opposite surfaces of the internal receiver.
delete delete The method of claim 1,
The potential measuring comparator controls the switch to sequentially select the plurality of internal electrode pairs, measures the potential received from each of the internal electrode pairs, and compares the measured potential with the maximum potential among the plurality of internal electrode pairs. An internal wireless power transmission system that outputs a switch control signal for selecting a receiving internal electrode pair.
The method according to claim 6,
The potential measuring comparator outputs a switch control signal for selecting internal electrode pairs for receiving the maximum potential among the plurality of internal electrode pairs by performing potential measurement and comparison of the plurality of internal electrode pairs at predetermined periods. Wireless power transfer system.
The method of claim 1,
When a large number of internal receiving devices are located inside the human body,
Intra-body wireless power transmission system that each intra-body receiving device simultaneously receives power from the electric field formed inside the human body through each pair of internal electrodes installed on the surface.

Images