Car Wireless Charging Coils

Car Wireless Charging Coils

The square wave output from the active crystal of the wireless charging coil wireless charger coil is filtered by a second-order low-pass filter to get a stable sine wave output, which is output to the parallel resonant circuit composed of the coil and capacitor after the triode 13003 and its peripheral circuit formed by the class C extension circuit, and radiated in to provide energy for the receiving part. The hollow coupling coil of the parallel resonant circuit composed of capacitors has a wire diameter of 0.5mm, a diameter of 7 cm, an inductance of 47 uH, and a carrier frequency of 2 MHz. According to the parallel resonance formula, the matching capacitor C is about 140 pF Therefore, the power carrier frequency of the 2 MHz active crystal oscillator attack close to the resonant frequency is selected for the transmitting part.