Wi-Fi, the Chinese name wireless fidelity, is a technology that can connect terminals such as personal computers and handheld devices (such as PADs and mobile phones) wirelessly. In fact, it is a high-frequency radio signal.
Wireless Fidelity is a brand of wireless network communication technology and is owned by the Wi-Fi Alliance. The goal is to improve interoperability between wireless network products of the IEEE 802.11 standard. At present, people generally confuse Wi-Fi with IEEE 802.11. Even equating Wi-Fi with the wireless internet.
Wireless charging technology (English: Wireless charging technology; Wireless charge technology) is derived from the wireless energy transmission technology, which can be divided into low-power wireless charging and high-power wireless charging.
Low-power wireless charging often uses electromagnetic induction, such as the Qi method of charging the mobile phone, but the inductive type of the wireless charging method of the electric vehicle of ZTE. High-power wireless charging often uses resonant (most electric vehicle charging uses this method). The power supply device (charger) transfers energy to the powered device, which uses the received energy to charge the battery and simultaneously supply itself. For operational purposes.
Since the magnetic energy is transmitted between the charger and the electric device, the wires are not connected between the two, so that the charger and the electric device can be exposed without conductive contacts.
Wireless charging technology (Wireless charge technology). The wireless charging technology is derived from wireless power transmission technology, which uses magnetic resonance to transfer charge in the air between the charger and the device. The coil and the capacitor form a resonance between the charger and the device to realize efficient energy transmission.
Using the "resonance" principle of physics - two objects with the same vibration frequency can efficiently transfer energy.
1. The electrical energy in the transmission line is transmitted to an antenna made of copper.
2. The antenna vibrates at a wavelength of 10 MHz to generate electromagnetic waves.
3. The energy emitted by the antenna propagates to 2 meters (6.5 feet).
4. A laptop that also vibrates at a frequency of 10 MHz receives current energy into the device.
5. Energy that is not converted to a laptop is not reabsorbed by the antenna. People and other objects that cannot produce a 10 MHz resonance will not interfere with it.
The principle is to use electromagnetic induction, and the simple point is to divide a transformer into two halves. The electromagnetic induction causes the charged part to get the corresponding voltage. It is not so much an innovation. From the aspect of energy saving, its loss is too Big!
The primary coil has a certain frequency of alternating current, and a certain current is generated in the secondary coil by electromagnetic induction, thereby transferring energy from the transmitting end to the receiving end. At present, the most common charging solution uses electromagnetic induction. In fact, the electromagnetic induction solution does not have much mystery in technology implementation. The local Chinese BYD company applied for non-contact inductive charging as early as December 2005. The patent is patented and uses electromagnetic induction technology.
Magnetic field resonanceIt consists of an energy transmitting device and an energy receiving device. When the two devices are adjusted to the same frequency or resonate at a specific frequency, they can exchange energy with each other. This is a technology currently under study by Massachusetts. The research team led by Marin Soljacic, a professor of physics at the Institute of Technology (MIT), used the technology to light a 60-watt bulb two meters away and named it WiTricity. The coil used in this experiment has a diameter of 50 cm and cannot be commercialized. If the coil size is to be reduced, the receiving power naturally decreases.
Radio waveThis is a relatively mature technology, similar to the early use of ore radios, mainly composed of microwave transmitting devices and microwave receiving devices, which can capture the radio wave energy rebounded from the wall and maintain stable DC while adjusting with the load. Voltage. This way you only need a transmitter that is mounted on the wall plug and a “mosquito†receiver that can be installed in any low voltage product.
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