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Simple and practical design of a wireless charger circuit

Published on Mar 17 2011 // Electrical Circuits

Basic function is through the coil to transmit power wirelessly to the battery. Simply charge the battery and receiving equipment on the platform to its charge. Proved. Although the system can not charge the invisible. However, many schools have been able to do the electrical charge placed on the same platform at the same time charging. Replacing wiring trouble.

 Simple and practical design of a wireless charger circuit 1

Principle and structure of a wireless charger
Wireless charging system mainly uses electromagnetic induction principle, the energy coupled through the coil to achieve energy transfer. Shown in Figure 1, the system will work input AC power by the full bridge rectifier circuit converted into direct current, or end with a 24V DC power supply directly to the system. After a power management module DC output by 2M active crystal frequency AC inverter into the supply primary winding. By two inductors coupled energy, secondary output current change has been accepted into the DC converter to charge the battery.

Simple and practical design of a wireless charger circuit 2

2.2 transmitter circuit module
Figure 3, the main oscillator circuit as a 2 MHz crystal oscillator is active. Square wave output of the active crystal, after removing second-order low-pass filter high harmonics are stable sine wave output, the transistor 13003 and its peripheral circuit of the Group C after the output to the amplifier circuit composed of coil and capacitor radiated parallel resonant circuit. Provide energy for the receiving part.

 Simple and practical design of a wireless charger circuit 3

2.2 The receiver circuit module
Measured in parallel with the capacitor resonant circuit composed of coupled coils air core diameter for the O. 5 mm, a diameter of 7 cm, inductance is 47 uH, the carrier frequency is 2 MHz. According to the formula have to match the parallel resonant capacitor C is about 140 pF. So. Launch active part is 2MHz crystal resonant frequency close to the production and the energy carrier frequency.

 Simple and practical design of a wireless charger circuit 4

2.3 Charging Circuit