The principle of wireless charging is that through near-field induction, the wireless charging device conducts energy to the charging terminal device, and the terminal device converts the received energy into electrical energy and stores it in the battery of the device. The principle of energy conduction is inductive coupling, which can ensure that there is no exposed conductive interface, which can not only save the messy transmission line between the equipment, but also be safer for electronic devices such as electric toothbrushes that are often in contact with conductive media such as liquids.
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At present, there are three main forms of wireless charging:
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1. Electromagnetic induction wireless charging
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2. Magnetic resonance wireless charging
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3. Radio wave wireless charging
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Wireless charging principle - electromagnetic induction wireless charging
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Electromagnetic induction wireless charging is the most used wireless charging solution, high school physics textbooks have mentioned through the primary coil a certain frequency of Sen current, using electromagnetic induction in the secondary coil to generate a certain current, so as to transfer energy from the transmission end to the receiving end. At present, the most common charging pad solution uses electromagnetic induction, in fact, electromagnetic induction solutions in the technical realization is not too mysterious, China's local BYD company, as early as December 2005 to apply for a non-contact induction charger patent, the use of electromagnetic induction technology.
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Wireless charging principle - magnetic resonance wireless charging
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Magnetic resonance wireless charging consists of an energy sending device and an energy receiving device. When the two devices are adjusted to the same frequency, or resonance at a specific frequency, they can exchange energy with each other. It is a technology that is currently being studied. The research team, led by MIT physics professor Marin Soljacic, used the technology to light a 60-watt light bulb two meters away and named it WiTricity. The diameter of the coil used in this experiment is 50cm, which is not yet commercially available, and if the size of the coil is reduced, the receiving power will naturally decrease.
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Wireless charging principle - radio wave wireless charging
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This is a more mature technology, similar to the early use of ore radios, mainly composed of microwave transmitters and microwave receivers, can capture the radio wave energy bouncing off the wall, while adjusting with the load while maintaining a stable DC voltage. This method requires only a transmitter mounted on the wall plug, and can be installed in any low-voltage product \"mosquito\"; The receiver.
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Wireless charging technology is a charging method of electromagnetic induction, the use of magnetic field to transmit energy, the principle of wireless charging is: the coil electromagnetic induction between the two terminals, to achieve energy transmission, one of the transmitting coil is used to send electrical energy, the other terminal receiving coil to the coil obtained in the power transfer to the need to charge the battery. As the transmitting coil rotates at a specific frequency, a magnetic field is generated, and the current modulated by the magnetic field can transmit electrical energy to another terminal receiving coil, and the current modulated oscillator in the receiving coil, the modulated oscillator reduces the output voltage through the transformer to achieve the function of charging.