Wireless charging technology is derived from wireless power transmission technology. It uses the inductive coupling between the near-field induction signal generator, power amplifier and electromagnetic induction device to transmit energy. The three are not connected by wires. The power amplifier is used as a medium for the transmission of electrical energy and the amplification of the signal wave in the electromagnetic field. "Coupling" for short-range transmission, its characteristics: short transmission distance, relatively fixed use position, high efficiency, convenient operation, very suitable for use as a wireless charging technology.
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 transmission is inductive coupling, which can ensure that there is no exposed conductive interface, not only eliminating the messy transmission line, but also safer for electronic equipment such as electric toothbrushes that are often in contact with conductive media such as liquids. The schematic diagram is as follows:
This experiment uses the electromagnetic induction effect: the energy is transferred through the coil to achieve energy transfer. The changing magnetic field will produce a changing electric field. The changing electric field will produce a changing magnetic field. The magnitude is related to their rate of change, while the change of the sine function The rate is another sinusoidal function, so the electromagnetic wave can propagate, and the generation of induced voltage is related to the change of magnetic flux, so the changing magnetic field inside the coil generates an induced voltage, thus completing the charging process. This magnetic field uses an ATA-3090 power amplifier, which can amplify AC and DC signals, with a maximum output power of up to 810W, and can drive power loads. It can be used with mainstream signal generators to achieve perfect signal amplification.
The input of this power amplifier is a BNC interface, and the input resistance is 50Ω and 5kΩ. It can be perfectly matched to the high and low internal resistance signal generator. The output is a banana jack, the maximum output voltage is 90Vp-p (± 45V), and the output current (peak value) is 18A.
Now the wireless charging system on the market can meet these needs. Just place the electronic device on the charging board to complete the charging. Wireless charging technology is an important direction for the development of electronic technology in the future, which frees people from complicated cables and plays an important role in the realization of electronic equipment and new energy vehicle power supplies.
Xi'an Antai Electronic Technology Co., Ltd. (Aigtek) is a leading high-tech company engaged in the research and development of electronic measuring instruments. Focusing on the research and development of power amplifiers, measurement calibration sources, wire harness testers and other products, breaking the technological monopoly and blockade in the West, the products are widely used in the field of defense, aerospace, aerospace and chip research, serving more than 1,000 scientific research institutions in the world and helping the world Technological progress. Aigtek has become a world-renowned test instrument brand.