Wireless charger circuit module circuit diagram

Figure 2 Transmitting circuit As shown above, the main oscillator circuit uses a 2 MHz active crystal oscillator as the oscillator. The square wave of the output of the active crystal oscillator is filtered out by the second-order low-pass filter to obtain a stable sine wave output, which is output to the coil and the capacitor through a class C amplifier circuit composed of a triode 13003 and its peripheral circuits. The parallel resonant tank radiates out to provide energy to the receiving portion. The core-coupling coil of the parallel resonant circuit composed of capacitance was measured to have a wire diameter of 0.5 mm, 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 capacitance C is about 140 pF. Thus, the transmitting portion uses a 2 MHz active crystal oscillator to generate an energy carrier frequency close to the resonant frequency.

Figure 4 charging circuit