Airborne high-frequency ground type power supply system
The single-pole electric field coupling method in the power supply system addresses the limitations of conventional systems by allowing flexible positioning and reducing component complexity through a novel electrode and reference potential configuration, facilitating free-position power supply.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- SWCC CORP KAWASAKI CITY
- Filing Date
- 2024-12-17
- Publication Date
- 2026-06-29
AI Technical Summary
Conventional electric field coupling power supply systems limit power supply orientation to the extending direction of electrodes, restricting freedom in positioning and requiring additional rectifier circuits for multiple orientations, which complicates the design and increases component requirements.
A power supply system utilizing a single-pole electric field coupling method with a power transmission module and a power receiving module, featuring a power transmission side electrode, insulating portion, and a reference potential forming portion that extends perpendicularly to the opposing surface, allowing for flexible positioning and eliminating the need for separate rectifier circuits.
Enables free-position power supply with a simpler structure and more flexible design by using a single pair of electrodes, reducing component complexity and enhancing positional freedom without additional components for reference potential formation.
Smart Images
Figure 2026106110000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a power supply system and a power supply structure using an electric field coupling method, and more particularly to a power supply system and a power supply structure enabling power supply at a free position.
Background Art
[0002] As shown in Non-Patent Document 1 below, the electric field coupling method known as a type of wireless power supply has a configuration (so-called "two-pole type") in which two pairs of electrode pairs are provided between the power transmission side and the power reception side, and power is supplied using a capacitor formed between the electrodes when the electrodes are close to each other.
Prior Art Documents
Non-Patent Documents
[0003]
Non-Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] As an example of the utilization of a power supply system using the electric field coupling method, a power transmission module is incorporated into furniture such as desks and cabinets installed on the floors, walls, roads, and structures in a facility, and a power reception module is incorporated into various electrical devices (including batteries, the same hereinafter) used in the structure to perform power supply at a free position. However, as shown in Non-Patent Document ①, the conventional two-pole type power supply system has a mode in which the electrodes on the power transmission module side of the two pairs of electrode pairs are arranged by extending them in a rail shape, giving freedom only in the extending direction of the electrodes, or a mode in which the power transmission / reception electrodes are arranged in multiple directions and a rectifier circuit is provided for each of the power reception side electrodes, and only a mode in which the angle (orientation) of the power reception side module with respect to the power transmission side module is not limited is disclosed.
[0005] Therefore, one of the objectives of the present invention is to provide a means that enables free-position power supply in an electric field coupling type power supply system in a manner different from that of a conventional two-pole power supply system. [Means for solving the problem]
[0006] The present invention, made to solve the above problems, is a power supply system that performs wireless power transmission in a free position using an electric field coupling method, comprising at least a power transmission module connected to a high-frequency power supply and a power receiving module connected to a load, wherein the power transmission module has at least a power transmission side electrode portion and a power transmission side insulating portion, and the power receiving module has at least a power receiving side electrode portion, a power receiving side insulating portion and a reference potential forming portion, wherein the reference potential forming portion consists of at least one element that extends in a direction nonparallel to the plane direction of the surface opposite the power transmission side electrode. Furthermore, in the present invention, the element may be extended in a direction substantially perpendicular to the surface direction of the opposing surface of the power transmission side electrode portion. [Effects of the Invention]
[0007] According to the present invention, free-position power supply can be realized in an electric field coupling type power supply system. [Brief explanation of the drawing]
[0008] [Figure 1] A schematic diagram showing the configuration of the power supply system according to Example 1. [Figure 2] An illustrative diagram of the equivalent circuit of the power supply system (single-pole type) according to Example 1. [Figure 3] An illustrative diagram of the equivalent circuit of a conventional power supply system (two-pole type). [Modes for carrying out the invention]
[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. [Examples]
[0010] <1> Overview (Figure 1) The power supply system according to the present invention is a power supply system that uses an electric field coupling method. As shown in Figure 1, the power supply system according to the present invention comprises at least a power transmission module A and a power receiving module B. When the modules are arranged facing each other, wireless power transmission by electric field coupling is performed by the high frequency flowing from a high-frequency power supply C connected to the power transmission module A, thereby realizing power supply (including charging; the same applies hereinafter) to an electronic device (including a battery) having a load E into which the power receiving module B is incorporated.
[0011] <1.1>Component Configuration (Figure 1) The power transmission module A has at least a power transmission side electrode portion 10 and a power transmission side insulating portion 20, which are arranged in order toward the side facing the power receiving module B. The power receiving module B has at least a power receiving side electrode portion 30 and a power receiving side insulating portion 40, and a reference potential forming portion 50, which are arranged in order toward the side facing the power transmitting module A. With the above configuration, the power supply system according to this embodiment realizes a single-pole electric field coupling power supply system in which a pair of electrodes is formed by the transmitting electrode section 10 and the receiving electrode section 30. The details of each element are explained below.
[0012] <2> Power transmission side electrode section (Figure 1) The power transmission side electrode portion 10 is provided on the power transmission module A and is a component that forms one of the electrodes of a capacitor in a wireless power supply circuit using an electric field coupling method. The power transmission side electrode section 10 is connected to the other electrode of a high-frequency power supply C, one of which is connected to ground D.
[0013] <3> Power transmission side insulation (Figure 1) The power transmission side insulating part 20 is a component provided in the power transmission module A to electrically insulate the power transmission side electrode part 10 from the outside of the power transmission module A. The power transmission side insulating portion 20 can be made of any member as long as it has electrical insulation properties and can cover the power transmission side electrode portion 10, and insulating materials in the form of sheets, films, or any other arbitrary shape can be used.
[0014] <4>Power reception side electrode portion (FIG. 1) The power reception side electrode portion 30 is provided in the power reception module B and is a member that forms the other electrode in a wireless power feeding circuit by the electric field coupling method. The power reception side electrode portion 30 is connected to one side of the load E. <5>Power reception side insulating portion (FIG. 1) The power reception side insulating portion 40 is provided in the power reception module B and is a member for electrically insulating the power reception side electrode portion 30 from the outside of the power reception module B. The power reception side insulating portion 40 can be made of any member as long as it has electrical insulation properties and can cover the power reception side electrode portion 30, and insulating materials in the form of sheets, films, or any other arbitrary shape can be used.
[0015] <6>Reference potential forming portion (FIG. 1) The reference potential forming portion 50 is provided in the power reception module B and is a member for forming a reference potential on the power reception module B. By the reference potential forming portion 50, a reference potential due to an air high-frequency ground formed on the power reception module B is ensured, so that a current using the capacitor formed between the power transmission side electrode portion 10 and the power reception side electrode portion 30 can flow to the load E.
[0016] <6.1>Configuration example of reference potential forming portion In the present invention, the mode of the reference potential forming portion 50 and the like are not particularly limited, and any mode capable of forming a reference potential on the power reception module B can be adopted. As an example of the reference potential forming portion 50, a method of providing at least one or more elements 51 extending in a non-parallel direction with respect to the surface direction F of the opposing surface of the power transmission side electrode portion 10 can be considered. The element 51 can use a rod member having a long shape. The element 51 that constitutes the reference potential forming section 50 is analogous to the rod portion that is erected perpendicular to the equipotential plane in grounded antennas such as whip antennas and ground plane antennas.
[0017] <6.2> Example of element configuration for forming a reference potential In the present invention, the number, orientation, length, etc., of the elements 51 constituting the reference potential forming section 50 are not particularly limited. In the present invention, the reason why at least one of the elements 51 constituting the reference potential forming section 50 has its extension direction (extension direction G of the element) nonparallel to the plane direction (plane direction F of the opposing surface) of the transmitting side electrode section 10 is to form a reference potential using a high-frequency ground in the air without being affected by high frequencies from the transmitting side, thereby generating a potential difference between the receiving side electrode section 30 and the element 51. If the extension direction G of the element were to be parallel to the plane direction F of the opposing surface, the transmitting side electrode section 10 and the element 51 would be in phase, resulting in no fixed reference potential and no potential difference being generated in the receiving side module. Therefore, in the present invention, from the viewpoint of securing a larger reference static potential, it is preferable to align the extension direction of the element 51 with the opposing surface of the power transmission side electrode portion 10 to be approximately perpendicular to it. In Figure 1, the element's extension direction G is perpendicular to the surface direction F of the opposing surface.
[0018] <6.3> Shared use with other components In this invention, components that make up various electrical devices that receive power as a load E, components that make up fixtures on which the electrical devices are placed, and components that make up transport equipment that can move the electrical devices may be reused as elements 51 that make up the reference potential forming unit 50. For example, if an automatic IV drip device mounted on an IV stand is used as the load E of the power supply system according to the present invention, the support column (pole) which is a component of the IV stand can be reused as element 51. In addition, if the light source of a desk stand (also called a "desk lamp") is used as the load E of the power supply system according to the present invention, the support column portion of this desk stand can also be reused as element 51.
[0019] <7> Equivalent circuit diagrams (Figures 2 and 3) Figure 2 is an equivalent circuit diagram of the power supply system according to this embodiment, and Figure 3 is an equivalent circuit diagram of a conventional two-pole power supply system. In the conventional two-pole electric field coupling type wireless power supply circuit shown in Figure 3, two combinations of electrodes (a pair of electrode sets a1, a2) are provided on the circuit, and wireless power supply (a two-pole wireless power supply circuit) is performed using two electrode sets. On the other hand, in the wireless power supply circuit according to the present invention, as shown in Figure 2, only an electrode pair consisting of a transmitting electrode section 10 and a receiving electrode section 30, corresponding to one electrode set a1 in Figure 3, is provided. On the transmitting module A side, a reference GND is secured by connecting one end of the high-frequency power supply C to earth D, and on the receiving module B side, a pseudo-GND is secured at one end of the load E by the reference potential forming section 50. As a result, a potential difference can be secured in each module, and the current necessary for wireless power supply can be generated.
[0020] <8> summary According to the power supply system of the present invention, at least one of the following effects can be obtained. (1) Since wireless power transfer using an electric field coupling method can be realized with only one pair of electrodes (transmitting electrode part 10, receiving electrode part 30), there are fewer constraints on the layout of each electrode in free position power transfer, making it possible to have a simpler structure and a more flexible design. (2) By making components of various electrical equipment that receive power as load E, fixtures on which the electrical equipment is placed, and components of transport equipment that can move the electrical equipment function as the reference potential forming unit 50, there is no need to prepare any new components separately for the reference potential forming unit 50. [Examples]
[0021] In the above-described embodiment 1, it is assumed that the receiving side electrode section 30, receiving side insulating section 40, and reference potential forming section 50 constituting the receiving side module B move together with respect to the transmitting side module A. Therefore, it is necessary to set the extension direction of the element 51 constituting the reference potential forming section 50 (extension direction G of the element) to be non-parallel, more preferably orthogonal, to the surface direction F of the opposing surface. For example, when a large wiring length is secured between the reference potential forming section 50 and the receiving side electrode section 30, and the reference potential forming section 50 is installed in a space other than the space above the transmitting side electrode section 30 when viewed from above, the extension direction of the element 51 is not particularly limited. [Explanation of symbols]
[0022] A: Power transmission module B: Power receiving module C: High frequency power supply D: Earth E: Load F: Planar direction of opposing surfaces G: Element extension direction 10: Power transmission side electrode section 20: Power transmission side insulation 30: Power receiving side electrode section 40: Insulation on the power receiving side 50: Reference potential forming section 51: First Element a1, a2: Pair of electrode sets b :High frequency power supply c :Load
Claims
1. A power supply system that performs wireless power transmission in free position using an electric field coupling method, A power transmission module connected to a high-frequency power supply, and It comprises at least a power receiving module connected to a load, The power transmission module has at least a power transmission side electrode portion and a power transmission side insulating portion, The power receiving module comprises at least a power receiving electrode section, a power receiving insulation section, and a reference potential forming section. The reference potential forming unit, It is characterized by comprising at least one element that extends in a direction non-parallel to the surface direction of the opposing surface of the power transmitting electrode. Power supply system.
2. The element is characterized in that it extends in a direction substantially perpendicular to the surface direction of the opposing surface of the power transmission side electrode portion. The power supply system according to claim 1.