Wireless Power Charging Coil Changing Considerations

ANP027

Wireless Power Charging is becoming more and more common in new gadgets like smarts phones, tablets and laptops. With this pace of technological growth one can certainly assume in the future that many domestic electronic devices will be charged or powered wirelessly. The number of manufacturers of wireless charging coils and control circuit chips are also expected to grow to meet increasing consumer demand. One may ask, why is the consumer market of interest to us? All known technologies have been mostly driven by the consumer electronic market, subsequently the Industrial and other similar sectors have taken advantages of the “went through learning curve” to lower their design time.

Summary

Higher coupling, lower physical distance between transmitter and receiver and higher turns ratio will ensure higher voltage at receiver and so higher VIN. The DHC function will limit the VIN available to DC to DC converter and will ensure the transmitter operating at wide operating voltage. It has been seen from the experiment (Condition # 2) that the efficiency is higher when the signal received is more sinusoidal. Therefore, when the application demands for wider input voltage higher turns ratio (Approx. 3) may be selected and when higher efficiency is demanded the optimized value of turns ratio (when the signal received is sinusoidal) is recommended.

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