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KR-102961243-B1 - RESONATOR PERFORMANCE IMPROVEMENT STRUCTURE

KR102961243B1KR 102961243 B1KR102961243 B1KR 102961243B1KR-102961243-B1

Abstract

According to various embodiments, a cover device that can be coupled to a wireless power receiver receiving wireless power from a wireless power transmitter may include: a first capacitor; a first coil connected to the first capacitor; a ferrite sheet disposed on at least a portion of the first coil in the coupling direction between the wireless power receiver and the cover device; and a metal sheet disposed on at least a portion of the ferrite sheet in the coupling direction between the wireless power receiver and the cover device. The first capacitor and the first coil may form a closed loop. The first resonant frequency of the first coil may be higher than the second resonant frequency of the second coil of the wireless power receiver.

Inventors

  • 박재현
  • 구범우
  • 김준홍
  • 박재석
  • 여성구
  • 유영호

Assignees

  • 삼성전자주식회사

Dates

Publication Date
20260507
Application Date
20220228

Claims (20)

  1. A cover device that can be coupled to a wireless power receiver that receives wireless power from a wireless power transmitter, First capacitor; A first coil connected to the first capacitor; A ferrite sheet disposed between the first coil and the wireless power receiver; and It includes a metal sheet disposed between the ferrite sheet and the wireless power receiver, The first capacitor and the first coil form a closed loop, and The first area of the first region including the interior of the closed loop is larger than the second area of the second region including the interior of the loop formed by the second coil of the wireless power receiver, and The ferrite sheet is in the form of a ring that covers the closed loop formed by the first coil and the first capacitor, and The metal sheet is in the form of a ring including a segment in an area not covered by the ferrite sheet, and The area of the region including the interior of the ring formed by the metal sheet is smaller than the area of the region including the interior of the ring formed by the ferrite sheet. Cover device.
  2. In Article 1, The first resonant frequency of the first coil is higher than the second resonant frequency of the second coil, and The second resonant frequency mentioned above is the transmission frequency of the wireless power, Cover device.
  3. In Article 1, The ferrite sheet is formed in the shape of a ring covering the closed loop to compensate for the reduction in coupling caused by the metal component constituting the wireless power receiver in order to increase the reception efficiency through the first coil of the cover device. Cover device.
  4. In Article 1, The metal sheet is formed in the shape of a ring between the ferrite sheet and the wireless power receiver to reduce the inductance of the second coil of the wireless power receiver. Cover device.
  5. In Article 4, The segment of the metal sheet is positioned at a designated location with a designated shape and designated size so as to determine the inductance of the second coil of the wireless power receiver that is reduced by the metal sheet. Cover device.
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  8. In Article 1, In a state where the wireless power receiver and the cover device are combined, the second region formed by the second coil is included in the first region formed by the first coil, Cover device.
  9. In Article 1, The first coil is formed such that the coupling coefficient between the first coil and the second coil is greater than or equal to a reference value. Cover device.
  10. In Article 2, The capacitance of the first capacitor is determined based on the transmission frequency of the wireless power transmitted from the wireless power transmitter, Cover device.
  11. In Article 10, The first resonant frequency is determined based on the capacitance of the first capacitor, Cover device.
  12. In a wireless power receiver that receives wireless power from a wireless power transmitter, Housing; A display disposed on one side of the above housing; A cover disposed on the opposite side of the display, which is the other side of the housing—the cover comprises a first capacitor, a first coil connected to the first capacitor, a ferrite sheet disposed between the first coil and a second coil of the wireless power receiver, and a metal sheet disposed between the ferrite sheet and the second coil—; and It includes the second coil disposed between the display and the cover, and The first capacitor and the first coil form a closed loop, and The first area of the first region including the interior of the closed loop is larger than the second area of the second region including the interior of the loop formed by the second coil, and The ferrite sheet is in the form of a ring that covers the closed loop formed by the first coil and the first capacitor, and The metal sheet is in the form of a ring including a segment in an area not covered by the ferrite sheet, and The area of the region including the interior of the ring formed by the metal sheet is smaller than the area of the region including the interior of the ring formed by the ferrite sheet. Wireless power receiver.
  13. In Article 12, The first resonant frequency of the first coil is higher than the second resonant frequency of the second coil, and The second resonant frequency mentioned above is the transmission frequency of the wireless power, Wireless power receiver.
  14. In Article 12, The ferrite sheet is formed in the shape of a ring covering the closed loop to compensate for the reduction in coupling caused by the metal component constituting the wireless power receiver in order to increase the reception efficiency through the first coil. Wireless power receiver.
  15. In Article 12, The metal sheet is formed in the shape of a ring between the ferrite sheet and the wireless power receiver to reduce the inductance of the second coil of the wireless power receiver. Wireless power receiver.
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  18. In Article 12, The second region formed by the second coil is included in the first region formed by the first coil, Wireless power receiver.
  19. In Article 12, The first coil is formed such that the coupling coefficient between the first coil and the second coil is greater than or equal to a reference value. Wireless power receiver.
  20. In Article 13, The capacitance of the first capacitor is determined based on the transmission frequency of the wireless power transmitted from the wireless power transmitter, and The first resonant frequency is determined based on the capacitance of the first capacitor, Wireless power receiver.

Description

Resonator Performance Improvement Structure Various embodiments relate to a structure for improving the performance of a resonator. Wireless charging technology utilizes wireless power transmission and reception, and refers to a technology in which, for example, a mobile phone's battery can be automatically charged by contacting a wireless power transmission device or by approaching the wireless power transmission device within a certain distance without connecting a separate charging connector. This wireless charging technology has the advantage of enhancing waterproofing capabilities by eliminating the need for a power supply connector on electronic products, and increasing the portability of electronic devices by eliminating the need for a wired charger. Wireless charging technologies include electromagnetic induction using coils, resonance using resonance, and radio frequency (RF/microwave radiation) methods that convert electrical energy into electromagnetic waves for transmission. Recently, wireless charging technology using electromagnetic induction or resonance methods has become widespread, primarily in electronic devices such as smartphones. When a wireless power transmitting unit (PTU) (e.g., a wireless power transmitting device) and a wireless power receiving unit (PRU) (e.g., a smartphone or a wearable electronic device) come into contact or approach within a certain distance, the battery of the wireless power receiving unit can be charged by means such as electromagnetic induction or electromagnetic resonance between the transmitting coil of the wireless power transmitting unit and the receiving coil of the wireless power receiving unit. FIG. 1 is a block diagram of a wireless power transmitter and a wireless power receiver according to various embodiments. FIG. 2 is a drawing showing an electronic device and a cover device according to various embodiments. FIG. 3 is a drawing for explaining the structure of a resonator placed in an electronic device and a cover device according to various embodiments. FIG. 4 is a drawing for explaining the structure of a resonator placed in an electronic device and a cover device according to various embodiments. FIG. 5 is a drawing for explaining the structure of a resonator placed in an electronic device and a cover device according to various embodiments. FIG. 6 is a drawing for explaining the structure of a resonator placed in an electronic device and a cover device according to various embodiments. FIG. 7 is a drawing for explaining the structure of a resonator placed in an electronic device and a cover device according to various embodiments. FIG. 8 is a drawing for explaining the structure of a metal sheet placed in a cover device according to various embodiments. FIG. 9 is a drawing for explaining the circuit structure of an electronic device and a cover device according to various embodiments. FIG. 10 is a drawing for explaining the resonance of an electronic device and a cover device according to various embodiments. FIG. 11 is a drawing for explaining the structure of a resonator of an electronic device including a cover according to various embodiments. FIG. 12 is a drawing for explaining the structure of a resonator of an electronic device including a cover according to various embodiments. FIG. 1 is a block diagram of a wireless power transmitter and a wireless power receiver according to various embodiments. Referring to FIG. 1, a wireless power transmitter (100) according to various embodiments can wirelessly transmit power (161) to a wireless power receiver (150). The wireless power transmitter (100) can transmit power (161) to the wireless power receiver (150) according to various charging methods. For example, the wireless power transmitter (100) can transmit power (161) according to an inductive method. When the wireless power transmitter (100) is inductive, the wireless power transmitter (100) may include, for example, a power source, a DC-AC conversion circuit, an amplifier circuit, an impedance matching circuit, at least one capacitor, at least one coil, a communication modulation/demodulation circuit, etc. At least one capacitor may form a resonant circuit together with at least one coil. The wireless power transmitter (100) may be implemented in a manner defined in the WPC (wireless power consortium) standard (or Qi standard). For example, a wireless power transmitter (100) may transmit power (161) according to a resonant method. In the case of a resonant method, the wireless power transmitter (100) may include, for example, a power source, a DC-AC conversion circuit, an amplifier circuit, an impedance matching circuit, at least one capacitor, at least one coil, an out-of-band short-range communication module (e.g., a BLE (Bluetooth Low Energy) short-range communication module), etc. At least one capacitor and at least one coil may form a resonant circuit. The wireless power transmitter (100) may be implemented in a manner defined in