Search

EP-4224666-B1 - WIRELESS CHARGING APPARATUS

EP4224666B1EP 4224666 B1EP4224666 B1EP 4224666B1EP-4224666-B1

Inventors

  • HUANG, HUA
  • ZHANG, XIALING
  • ZHU, Xiaoyong
  • ZHANG, Anle

Dates

Publication Date
20260506
Application Date
20220824

Claims (8)

  1. A wireless charging device (100a) for charging an electronic device (200), comprising a housing (10a), a transmit coil (20), and a heat dissipation assembly (30), wherein the housing (10) is provided with a panel (11), and the transmit coil (20) is disposed in the housing (10), and is located on a side of the panel (11); the housing (10a) is configured to place the electronic device (200) to be charged onto the panel (11), and make the electronic device (200) have a distance from the panel (11); the housing (10a) is provided with a first cavity (102), a second cavity (103) and a third cavity (104), the housing (10a) is provided with an air inlet (105) and an air outlet (101) both communicating with the first cavity (102) and located below the panel (11), the third cavity (104) communicates with the first cavity (102) and the second cavity (103) respectively, the third cavity (104) is located above the first cavity (102) and at one side of the second cavity (103), the housing (10a) is provided with a further air outlet (106), located on a side of the third cavity (104) away from a first heat conducting member (33), the transmit coil (20) is disposed in the second cavity (103) and contacts one side of the panel (11), the heat dissipation assembly (30) comprises: - a semiconductor refrigeration chip (31) and a fan (32) disposed in the first cavity (102), the semiconductor refrigeration chip (31) comprising a cold end (311) and a hot end (312), wherein the hot end (312) is disposed on the housing (10a), and air blown by the fan (32) passes through the cold end (311) and is blown out from the air outlet (101), such that air enters the first cavity (102) from the air inlet (105), and the fan (32) guides the air to blow to the space between the electronic device (200) and the panel (11), - a first thermally conductive member (33) located in the second cavity (103), disposed on a side that is of the transmit coil (20) and that is away from the panel (11), wherein the panel (11), the transmit coil (20) and the first thermally conductive member (33) are stacked in sequence and conduct heat in sequence; and the heat dissipation assembly (30) further comprises: - another fan (32a) and another semiconductor refrigeration chip (31a), wherein the another semiconductor refrigeration chip (31a) is stacked on one side of the transmit coil (20) and the first thermally conductive member (33), and the another fan (32a) is disposed on the housing (10a) and located in the first cavity (102), the wind blown by the another fan (32) is blown to the first thermally conductive member (33) and discharged from the air outlet (106), the first thermally conductive member (33) is obliquely disposed above the another fan (32a),so that the projection of the first thermally conductive member (33) on the another fan (32a) is enlarged and the air blown by the another fan (32a) can be directly blown to a larger area of the first thermally conductive member (33).
  2. The wireless charging device according to claim 1, wherein the another semiconductor refrigeration chip (31a) is disposed between the transmit coil (20) and the first thermally conductive member (33), the cold end (311) faces the transmit coil (20), and the hot end (312) faces the first thermally conductive member (33).
  3. The wireless charging device according to claim 1, wherein the first cavity (102) comprises a first segment (1021) and a second segment (1022), the second segment (1022) extends upward along a curve from the first segment (1021) to the air vent (101), the fan (32) is located in the first segment (1021), and the semiconductor refrigeration chip (31) is located in the second segment (1022).
  4. The wireless charging device according to claim 1, wherein the wireless charging device (100) further comprises a circuit board (40), and the circuit board (40) is electrically connected to the transmit coil (20), the fan (32), and the another fan (32a), the circuit board (40) is disposed on the housing (10a), and is located in the third cavity (104), and air blown by the another fan (32a) can be blown to the first thermally conductive member (33) and the circuit board (40), and is discharged from the air exhaust vent (106).
  5. The wireless charging device according to any one of claims 1 to 4, wherein the wireless charging device (100) further comprises a second thermally conductive member (34), and the second thermally conductive member (34) is disposed between the transmit coil (20) and the semiconductor refrigeration chip (31).
  6. The wireless charging device according to claim 5, wherein the heat dissipation assembly (30) further comprises a third thermally conductive member (35), and the third thermally conductive member (35) is disposed between the semiconductor refrigeration chip (31) and the first thermally conductive member (33).
  7. The wireless charging device according to claim 6, wherein the second thermally conductive member (34) or the third thermally conductive member (35) is a thermally conductive structure made of a thermally conductive material that is deformable under pressure.
  8. The wireless charging device according to any one of the preceding claims, wherein the another fan (32a) and the first thermally conductive member (33) are arranged relatively to each other so that air blown by the another fan (32a) is obliquely blown directly onto a cover or base side of the first thermally conductive member (33).

Description

TECHNICAL FIELD The present invention relates to the field of wireless charging technologies, and in particular, to a wireless charging device. BACKGROUND In a wireless charging process of an electronic device, a large amount of heat is generated by the electronic device. If charging time is relatively long, the heat may cause damage to both the electronic device and a wireless charging device. An existing low-power wireless charging device is not provided with a heat dissipation structure, or dissipates heat of the electronic device by being in contact with a heat sink; and a high-power wireless charging device dissipates heat of the electronic device by using a fan. However, a heat dissipation effect is not ideal, and needs to be further optimized. CN 110 932 415 A describes a wireless charger that comprises a transmitting coil, a printed circuit board and a fan, and further comprises a first shell which comprises a surface shell, a first bottom shell, and a supporting base for supporting to-be-charged equipment, a first air outlet is formed in the middle of the surface shell; a second shell which is connected with the first shell to form a first cavity, and a second air outlet is formed in the second shell; a semiconductor cooling plate which is arranged in the first cavity, and the semiconductor cooling plate is provided with a refrigeration surface and a heating surface, the first air outlet is configured to enable airflow cooled by the refrigeration surface to flow out from the first air outlet so as to cool the to-be-charged equipment, and the second air outlet is configured to enable airflow flowing through the heating surface to cool the heating surface and then flow out from the second air outlet. WO 2021/088360 A1 describes a wireless charging base that comprises: a charging panel used for charging the electronic device and comprising a first ventilation hole and a second ventilation hole, the first ventilation hole being formed in the lower surface of the charging panel, and the second ventilation hole being formed in the side surface of the periphery of the charging panel, wherein an air duct exists between the first ventilation hole and the second ventilation hole; a first bottom plate provided on the upper surface of the charging panel, located at one end of the charging panel and used for supporting the electronic device when the electronic device is charged, the first bottom plate comprising a third ventilation hole, and the third ventilation hole being formed in a first surface of the first bottom plate; and a second bottom plate provided on the lower surface of the charging panel, located at the same end as the first bottom plate and used for supporting the charging panel, the second bottom plate comprising a fourth ventilation hole, and the fourth ventilation hole being formed in the first surface of the second bottom plate, wherein an air duct exists between the third ventilation hole and the fourth ventilation hole. CN 212 543 377 U describes a wireless charger that includes: a housing, including a contact plate used for contact with the rear surface of the terminal device; a wireless charging module; a first fan, capable of dissipating heat of the wireless charging module, where both the wireless charging module and the first fan are disposed in the housing, and an air intake vent is disposed at a position that is of the housing and that is close to the first fan; and an airflow guide structure, disposed on a side that is of the housing and that is adjacent to the contact plate, where the airflow guide structure extends toward the display surface of the terminal device, the airflow guide structure includes a flow channel, a first air exhaust vent connected to the flow channel is disposed at a position that is of the airflow guide structure and that is close to the display surface of the terminal device, an air vent connected to space in which the first fan is located is disposed at a position that is of the housing and at which the airflow guide structure is disposed, and the air vent is connected to the flow channel. SUMMARY In view of this, it is an object of the present invention to provide a wireless charging device with a good heat dissipation effect, as defined in claim 1. This object is solved by the subject-matter of the independent claim, wherein further embodiments are set out in the dependent claims. According to a first aspect, this application provides a wireless charging device for charging an electronic device. The wireless charging device includes a housing, a transmit coil, and a heat dissipation assembly. The housing is provided with a panel. The transmit coil is disposed in the housing, and is located on a side of the panel. The housing is configured to place an electronic device to be charged, and the electronic device is at a distance from the panel. The housing is provided with an air vent located under the panel. The heat dissipation assembly includes a semicond