1, wireless charging system mainly use the principle of electromagnetic induction coil, through the transfer of intermittent energy coupling end energy. When the system works input AC power through the full bridge rectifier circuit is converted into DC, or 24V DC side directly to the power supply system. The DC power supplymanagement module output through the 2M crystal active inverter transform into high frequency alternating current supply of primary winding. After the 2 inductance coil coupling energy, current secondary coil output byreceiving conversion circuit changes into direct current to charge the battery.
2, wireless charging coil output active crystal Fang Bo, after the two order low-pass filter to filter out theharmonic, obtain the sine wave output stable, parallel resonant circuit radiation by the transistor 13003 and itsperipheral circuits of the class C expansion circuit is output to the coil and capacitance in. To receive part of the supply of energy. Air core coil line parallel resonant circuit and the capacitance measured the size of O.5 mm, a diameter of 7 cm, the inductance is 47 uH, the carrier frequency is 2 MHz. According to the formula, parallel resonant capacitor C is about 140 pF. Therefore. The emission part selects 2MHz crystal active attack power carrier frequency close to the resonance frequency and.
At that time, mobile phone, notebook computer. MP3 and other portable electronic devices is the primaryselection of continuous charging is connected to one end of the AC power supply, the other end is connectedto the portable electronic device charging rechargeable battery. This approach has many bad middle, primaryrepeatedly plug is simple joint damage. The other can cause electric shock risk. Therefore, non touch typeinduction charger was born in the late last century. Due to its convenience, low cost, with no wiring and other advantages of fast by all circles pay attention to. Therefore, the end of wireless charging, high transmission efficiency, easy to take to become one of the research direction of the charging system. This article is organized in a simple applicable to wireless charger after coil power in wireless way transmission to the battery.Simply put the battery and acceptance of equipment on the charging platform to the continuous charging. The real test confirmed that the system is not charging. Of course, in the invisible. But it can do a plurality of schoolequipment placed on the same platform with the charging charging.