page_title: Wireless power transfer
hierarchical_section_title: Wireless power transfer
caption_attribution_description: ಕನ್ನಡ: LG전자는 지난 주 개최된 제 26차 무선충전협회(WPC; Wireless Power Consortium) 정기회의에서 자체 개발한 고효율 무선충전 패드 기술을 이 협회의 국제표준인 ‘치(Qi)’ 규격으로 승인 받았다. English: Wireless charging pat for LG smartphone, using the Qi (pronounced 'Chi') international inductive power standard published by the Wireless Power Consortium (WPC). The phone is placed on the pad and it automatically charges.
context_page_description: Wireless power transfer, wireless power transmission, wireless energy transmission, or electromagnetic power transfer is the transmission of electrical energy without wires as a physical link. In a wireless power transmission system, a transmitter device, driven by electric power from a power source, generates a time-varying electromagnetic field, which transmits power across space to a receiver device, which extracts power from the field and supplies it to an electrical load. The technology of wireless power transmission can eliminate the use of the wires and batteries, thus increasing the mobility, convenience, and safety of an electronic device for all users. Wireless power transfer is useful to power electrical devices where interconnecting wires are inconvenient, hazardous, or are not possible.
  Wireless power techniques mainly fall into two categories, near field and far-field. In near field or non-radiative techniques, power is transferred over short distances by magnetic fields using inductive coupling between coils of wire, or by electric fields using capacitive coupling between metal electrodes.
context_section_description: Wireless power transfer (WPT), wireless power transmission, wireless energy transmission (WET), or electromagnetic power transfer is the transmission of electrical energy  without wires as a physical link. In a wireless power transmission system, a transmitter device, driven by electric power from a power source, generates a time-varying electromagnetic field, which transmits power across space to a receiver device, which extracts power from the field and supplies it to an electrical load. The technology of wireless power transmission can eliminate the use of the wires and batteries, thus increasing the mobility, convenience, and safety of an electronic device for all users. Wireless power transfer is useful to power electrical devices where interconnecting wires are inconvenient, hazardous, or are not possible.
  Wireless power techniques mainly fall into two categories, near field and far-field.  In near field or non-radiative  techniques, power is transferred over short distances by magnetic fields using inductive coupling between coils of wire, or by electric fields using capacitive coupling between metal electrodes.  Inductive coupling is the most widely used wireless technology; its applications include charging handheld devices like phones and electric toothbrushes, RFID tags, induction cooking, and wirelessly charging or continuous wireless power transfer in implantable medical devices like artificial cardiac pacemakers, or electric vehicles.
  In far-field or radiative techniques, also called power beaming, power is transferred by beams of electromagnetic radiation, like microwaves  or laser beams.  These techniques can transport energy longer distances but must be aimed at the receiver.  Proposed applications for this type are solar power satellites, and wireless powered drone aircraft.
  An important issue associated with all wireless power systems is limiting the exposure of people and other living things to potentially injurious electromagnetic fields.
caption: Inductive charging pad for a smartphone as an example of near-field wireless transfer.  When the phone is set on the pad, a coil in the pad creates a magnetic field[1]  which induces a current in another coil, in the phone, charging its battery.
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