The ear charging induction coil is a device for charging headphones, and the principle is similar to that of a transformer. The ear charging induction coil has a coil at the sending end and a coil at the receiving end. The electromagnetic signal at the terminal generates current to charge the battery. Inductance is a physical quantity that measures the ability of the coil to generate electromagnetic induction.
When current is applied to the ear-charging induction coil, a magnetic field will be generated around the coil, and the magnetic flux will pass through the coil. The greater the power entering the coil, the stronger the magnetic field, and the greater the magnetic flux passing through the coil. In electronic circuits, the role of the inductive coil is For AC current limiting, it can be combined with resistors or capacitors to form high-pass or low-pass filters, phase-shift circuits and resonant circuits. AC coupling, transformation, transformation, impedance transformation, etc. can be performed. Use: TV antenna reception, electronic toys, electric vehicles, Car audio, electric toothbrush, wireless charging headset, wireless charging mobile phone, watch, etc.
In terms of function, the ear charging induction coil can be divided into a transmitting coil and a receiving coil. There are short distance and long distance, but considering various factors, it is better to use short distance (within 2-3mm), which is also supported by many manufacturers. The resonant frequency of the transmitting coil and the receiving coil should be consistent and used in pairs, that is to say, the QI standard is broadband (110 kHz-205 kHz); The coil can be made of thicker wire, acetone wire or multi-strand wire and multi-layer winding, which means that the thickness of the antenna is not special.
Low-power wireless charging usually uses an inductive coil for ear charging. For example, mobile phone charging adopts induction method, but electric vehicle wireless charging adopts induction method. High-power wireless charging usually adopts resonance type, in which the power supply device transmits energy to the received energy. A device that charges a battery while running itself.