CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a national entry of PCT Application No. PCT/KR2018/010682 filed on Sep. 12, 2018, which claims priority to and the benefit of Korean Application No. 10-2017-0117739 filed Sep. 14, 2017, in the Korean Patent Office, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a wireless power transfer technique, and more particularly, to a wireless power transmission device capable of performing both data communication and wireless charging.

BACKGROUND ART

Recently, in electronic devices, various functions such as wireless charging and data transmission through near-field communication (NFC) have been added. NFC is a radio-frequency identification (RFID), which is an electronic tag, which is non-contact short-range wireless communication technology that uses a frequency band of 13.56 MHz and allows data to be transmitted between terminals at a close range within 10 cm.

When such short-range wireless communication technology is applied to a vehicle, various pieces of information of the vehicle may be transmitted to a portable electronic device. Accordingly, a user may easily check the information of the vehicle using the portable electronic device.

Therefore, a wireless power transmission device for a vehicle applied to the vehicle needs to be implemented so that a short-range wireless communication function may smoothly operate together with an intrinsic wireless charging function for charging a battery of a portable electronic device.

As one of implementation methods, a method of arranging a circuit board on which an NFC antenna for short-range wireless communication is patterned on an upper side of a transmission coil for wireless power transmission has been proposed.

The wireless power transmission device for a vehicle of the above method may perform both a wireless charging function and a short-range wireless communication function. However, since the circuit board on which the NFC antenna is formed is separately stacked on the upper side of the transmission coil, a total thickness of the wireless power transmission device for a vehicle may be increased by a thickness of the circuit board. Accordingly, when charging the battery of the portable electronic device, there is a limit that a distance between the transmission coil and a reception coil embedded in the electronic device may be increased due to the thickness of the circuit board. As a result, the transmission coil has a problem in that charging efficiency is degraded.

DISCLOSURE

Technical Problem

The present invention is directed to providing a wireless power transmission device capable of smoothly performing both a data communication function and a wireless charging function while preventing wireless charging efficiency from being degraded.

Technical Solution

One aspect of the present invention provides a wireless power transmission device including at least one antenna for wireless power transmission disposed on one surface of a magnetic field shielding sheet, a heat dissipation housing in which at least one circuit board is embedded and which emits heat generated from a heat source, a cover coupled to the heat dissipation housing to cover the at least one antenna for wireless power transmission, and an antenna for wireless communication formed integrally with the cover.

The antenna for wireless communication may be embedded in an inner surface of the cover.

The antenna for wireless communication may be disposed so as not to overlap the antenna for wireless power transmission.

The antenna for wireless communication may be a laser direct structuring (LDS) antenna formed on one surface of the cover.

The cover may be made of a heat dissipation plastic material having heat dissipating properties.

The wireless power transmission device may further include a plate type heat dissipation plate disposed on one surface of the magnetic field shielding sheet. For example, the heat dissipation plate may be any one of a plate type copper plate, aluminum plate, and graphite sheet.

The wireless power transmission device may further include a support plate having at least one accommodation groove formed in each of a first surface and a second surface which are opposite to each other, and the antenna for wireless power transmission may be composed of a plurality of flat-plate type coils. In this case, any one of the plurality of flat-plate type coils may be disposed in a first accommodation groove formed in the first surface, and the other one may be disposed in a second accommodation groove formed in the second surface.

The support plate may be made of a plastic material having heat dissipating properties.

Another aspect of the present invention provides a wireless power transmission device including at least one antenna for wireless power transmission disposed on one surface of a magnetic field shielding sheet, a support plate having at least one accommodation groove for accommodating the antenna for wireless power transmission, and an antenna for wireless communication disposed along a side portion of the support plate.

The support plate may include an arrangement groove which is formed inwardly into a side portion thereof so as to accommodate the antenna for wireless communication, and the antenna for wireless communication may be a conductive member wound a predetermined number of turns around the arrangement groove.

A width of the arrangement groove may be identical to a wire diameter of the conductive member.

The support plate may include two through-holes formed to allow both ends of the antenna for wireless communication to pass therethrough.

Any one of the two through-holes may be formed to be relatively located at an inner side of the support plate. In this case, the two through-holes may be formed at locations in communication with the arrangement groove.

The wireless power transmission device may further include a plate type heat dissipation plate disposed on one surface of the magnetic field shielding sheet, the heat dissipation plate may include a cut portion formed inwardly into one side thereof to have a predetermined area, and a circuit board, which is electrically connected to the antenna for wireless power transmission and the antenna for wireless communication, may be disposed on the cut portion.

The wireless power transmission device may include at least one temperature sensor mounted on one surface of the circuit board, and the magnetic field shielding sheet may include a through-hole formed to pass therethrough in a region corresponding to the temperature sensor.

Advantageous Effects

According to the present invention, by optimizing an arrangement location of an antenna for wireless communication, both data communication and wireless charging can be smoothly performed while preventing wireless charging efficiency from being degraded.

Further, in the present invention, by using a support plate, a plurality of flat-plate type coils can be placed in accordance with certification standards, thereby increasing assembling productivity, and by using a heat dissipation plate, in addition to improving heat dissipation performance, assembling and fastening with other parts can be improved.

