KR-20260066344-A - RECEIVING STRUCTURE AND WIRELESS POWER TRANSMISSION SYSTEM INCLUDING THE SAME

Abstract

The present invention relates to a receiving structure and a wireless power transmission system including the same. The receiving structure comprises: a transmitting unit including a transmitting coil that transmits power received from a power source in a non-contact manner; and a receiving unit including a magnetic body and a plurality of receiving coils positioned on the magnetic body to form a magnetic coupling with the magnetic body, for receiving the power and rectifying the received power to supply it to a load. The magnetic body includes a shielding structure that separates the plurality of receiving coils to shield mutual induction between the plurality of receiving coils. Through this, the plurality of receiving coils are mutually shielded, thereby reducing leakage magnetic fields.

Inventors

• 신유준

Assignees

• 계명대학교 산학협력단

Dates

Publication Date

20260512

Application Date

20241104

Claims (8)

1. A transmitter that transmits power received from a power source in a non-contact manner, including a transmitting coil; and A receiving unit comprising a magnetic body and a plurality of receiving coils positioned on the magnetic body to form a magnetic coupling with the magnetic body, for receiving the power, and rectifying the received power to supply it to a load. The above magnetic body is, A wireless power transmission system comprising a shielding structure that separates the plurality of receiving coils to shield mutual induction between the plurality of receiving coils.
2. In paragraph 1, The above shielding structure is, A wireless power transmission system provided with a partition located between a plurality of receiving coils on the magnetic body, such that the plurality of receiving coils are located in different spaces.
3. In paragraph 1, The above plurality of receiving coils are, A wireless power transmission system configured with different number of turns and equipped with asymmetric sizes.
4. In paragraph 1, The above plurality of receiving coils are, A wireless power transmission system in which the phases of the coils are opposite to each other, and the magnetic field polarities are positioned oppositely so that the leakage magnetic fields generated from each coil cancel each other out.
5. As a receiving structure that receives power in a non-contact manner, magnetic material; and It includes a plurality of receiving coils positioned on the magnetic body to form a magnetic coupling with the magnetic body and receive the power, The above magnetic body is, A receiving structure comprising a shielding structure that separates the plurality of receiving coils to shield mutual induction between the plurality of receiving coils.
6. In paragraph 5, The above shielding structure is, A receiving structure provided with a partition wall positioned between a plurality of receiving coils on the magnetic body, such that the plurality of receiving coils are located in different spaces.
7. In paragraph 5, The above plurality of receiving coils are, A receiving structure provided with a different number of turns and configured with an asymmetric size.
8. In paragraph 5, The above plurality of receiving coils are, A receiving structure in which the phases of the coils are opposite to each other, so that the leakage magnetic fields generated from each coil are mutually canceled out, and the magnetic field polarities are positioned opposite to each other.

Description

Receiving structure and wireless power transmission system including the same The present invention relates to a receiving structure for reducing leakage magnetic fields and a wireless power transmission system including the same. This invention is a research result supported by the "Development of Advanced Technology for Wireless Charging Systems for Manufacturing Robots" (Project Name: LINC 3.0 - Development of Advanced Technology Tailored to Regional Enterprise Demand) (Project No.: 20240368) organized by the National Research Foundation of Korea. Recently, wireless power transfer (WPT) technology is being developed and commercialized in various fields, including portable electronic devices, medical devices, electric vehicles, and robots, due to enhanced convenience and stability resulting from the simplification of charging structures. In particular, research is being conducted on wireless power transmission technology capable of delivering high outputs of several kW to tens of kW with high power transmission efficiency in electric vehicles, such as automated guided vehicles (AGVs) used in plant, automobile, and train industries. Since such wireless power transmission utilizes electromagnetic induction, magnetic resonance, and radiation properties between RF band transmitting and receiving antennas to transfer power, it can generate high levels of electromagnetic waves during power transmission. FIGS. 1 and FIGS. 2 are drawings illustrating a conventional wireless power transmission system including a magnetic material and a coil. In a conventional planar wireless power transmission system as illustrated in FIGS. 1 and 2, a leakage magnetic field is generated in both the transmitting (Tx) and transmitting (Rx) regions. Since the leakage magnetic field generated during this wireless power transmission process can produce electromagnetic waves, it is necessary to reduce the leakage magnetic field. FIGS. 1 and 2 are drawings illustrating the structure of a transmitter and a receiver for conventional wireless power transmission. FIG. 3 is a perspective view illustrating a receiving choking agent according to an embodiment of the present invention, FIG. 4 is a side view for explaining a receiving structure according to an embodiment of the present invention, FIG. 5 is a drawing for explaining a wireless power transmission system including a receiving structure according to an embodiment of the present invention, FIG. 6 is an equivalent circuit diagram for explaining a wireless power transmission system according to an embodiment of the present invention, FIG. 7 is a phasor diagram to explain the current phase in the transmitting coil and the receiving coil, FIGS. 8 and 9 are drawings for explaining a magnetic field in a wireless power transmission system according to an embodiment of the present invention, and, FIG. 10 is a diagram comparing the magnetic field in a conventional wireless power transmission system shown in FIG. 1 and the magnetic field in a wireless power transmission system according to an embodiment of the present invention. The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that various embodiments of the invention are different but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in relation to one embodiment. It should also be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. Accordingly, the following detailed description is not intended to be limiting, and the scope of the invention is limited only by the appended claims, including all equivalents to those claimed therein, provided appropriately described. Similar reference numerals in the drawings refer to the same or similar functions across various aspects. The components according to the present invention are defined by functional distinction rather than physical distinction, and can be defined by the functions each performs. Each component may be implemented as hardware or as program code and processing units that perform each function, and the functions of two or more components may be included and implemented in a single component. Therefore, it should be noted that the names assigned to the components in the following embodiments are not intended to physically distinguish each component but are assigned to imply the representative function performed by each component, and that the technical concept of the present invention is not limited by the names of the components. Preferred embodiments