Wireless charging receiving device and wireless charging system using the same

• US 9,461,500 B2
• Filed: 11/21/2013
• Issued: 10/04/2016
• Est. Priority Date: 11/21/2013
• Status: Active Grant

• Current Assignee: HTC Corporation
• Original Assignee: HTC Corporation
• Inventors: Tseng, Chun-Wei, Ho, Chien-Ting, Chen, Chien-Chih, Kuo, Yen-Liang
• Primary Examiner(s): DOAN, NGHIA M
• Application Number:
  US14/085,817
• Publication Number:
  US 20150137742A1
• Time in Patent Office: 1,048 Days
• Field of Search: 320/108
• US Class Current: 1/1
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

A wireless charging receiving device includes a body, a metal housing, a receiving coil, and a power storage device. The metal housing is coupled to the body to form an accommodating space. The metal housing includes an aperture and at least one slit. The slit interconnects the aperture and the edge of the metal housing. The receiving coil is disposed between the metal housing and the body. The receiving coil defines a through hole by a looped configuration, and the through hole overlaps at least part of the aperture of the metal housing. The power storage device is disposed within the accommodating space and electrically connected to the receiving coil. Electromagnetic waves are able to pass through the aperture of the metal housing and are magnetically coupled to the receiving coil, such that the receiving coil transfers the energy of the electromagnetic waves to the power storage device.

Claims

1. A wireless charging receiving device, comprising:

a body;

a metal housing coupled to the body to form an accommodating space, wherein the metal housing comprises an aperture and at least one slit, and the slit interconnects the aperture and an edge of the metal housing;

a receiving coil disposed between the metal housing and the body, wherein the receiving coil defines a through hole by a looped configuration, wherein the through hole overlaps at least part of the aperture of the metal housing;

a power storage device disposed within the accommodating space and electrically connected to the receiving coil, wherein electromagnetic waves are capable of passing through the aperture of the metal housing and magnetically coupling to the receiving coil, such that the receiving coil transfers an energy of the electromagnetic waves to the power storage device; and

a tunable capacitor electrically coupled to the receiving coil to synchronously adjust a resonant frequency of the receiving coil to match an emitting frequency of a wireless charging transmitting device.

2. The wireless charging receiving device of claim 1, wherein the tunable capacitor is disposed at one end of the receiving coil.

3. The wireless charging receiving device of claim 1, further comprising:

a spring strip connected to one end of the receiving coil, wherein the tunable capacitor is electrically coupled to the receiving coil by the spring strip.

4. The wireless charging receiving device of claim 1, wherein the number of the slits is even and the slits are symmetrically disposed relative to the aperture.

5. The wireless charging receiving device of claim 1, further comprising:

a receiving module electrically coupled to the receiving coil and the power storage device.

6. The wireless charging receiving device of claim 5, wherein the receiving module comprises:

a receiving matching circuit utilized to match an impedance between a transmitting source and the receiving coil;

a rectifier utilized to transform an inductive current of the receiving coil to a direct current;

a DC-DC converter utilized to adjust a voltage of the direct current; and

a power management integrated circuit connected to the power storage device and utilized to transmit the direct current to the power storage device and manage power transfer of the power storage device.