Wireless_light

The idea comes from Heiguo Studio of station b [Ultra-long distance wireless power supply module] Extreme sensing distance 300mm inductive LED wireless sensing module_bilibili_bilibili
1. Wireless power transmitting module:
     XKT-510 chip information can refer to xkt-510 Updated version of wireless charging transmitter chip specification sheet - Docin.com
     You can also find some references on the company's official website of the chip: Shenzhen Xinkote Semiconductor Co., Ltd. (xktbdt.com)
     Its typical application circuit is shown in the figure below :
 
       It is worth noting that the NPO capacitors used in the circuit diagram are temperature-insensitive capacitors, and the AC current flowing through them is relatively large. It is best not to replace them with capacitors made of other materials such as X7R or X5R.
2. PCB coil:
    L1 in the circuit diagram is the coil used for resonance and transmission of electric energy. To design a PCB coil with a specific inductance value, you can use some online design tools to determine the number of turns, turn spacing and other parameters. Here are two:
    Coil Designer (ti.com)
    Inductance of ring PCB coil (dwenzhao.cn)
    PCB coils are easy to make, and for DIY enthusiasts, you can also freely customize beautiful patterns.
    The inductor value in this design is approximately 5uH. (There should be some actual errors, because the measured resonant frequency does not match the expected value)
3. LED receiving end:
    The measured resonant frequency of the power transmitting module is about 175kHz. Welding a specific combination of inductors, capacitors and LEDs in parallel can receive enough power to light up the LED.
    After testing, using a 6.8uH package as a CD75 or CD54 inductor and a 0.1uF ceramic capacitor can light up. You can also use a 33uH I-shaped inductor with a 22nF ceramic capacitor. Using a 470uH inductor packaged as CD75 can light up even without a capacitor.
Ps: The module power interface in the pictures and videos is upside down and has been corrected in the project.