Resonant Frequency Modulation for Regulation and Security in Wireless Power Transfer

Technology

This technology employs a secure and cooperative power sharing method. It comprises of wireless resonant inductive power receivers that use a public authentication key protocol. Each receiver includes a public key that securely pairs with a private key only owned by a compliant charger, allowing for multiple devices to connect to one charger. The receivers also have a wireless detuning function to control the amount of power received from a charger based on different operating conditions (i.e., proximity and orientation of devices to the charger). This detuning functionality is possible through resonant frequency modulation between the two coupled coils in a receiver.

Problem Addressed

Coupled inductors enable wireless recharging of personal electronics, wearable technologies, and IOT devices. Counterfeit wireless chargers that do not fulfil power specs of a device can send harsh transient signals, causing damage in the device’s battery and surrounding hardware. Secure hash algorithm (SHA) authentication protocols have been used to avoid charging problems between a charger-device pair. Unfortunately, these security protocols are not suitable for IOT systems, where a charger supplies power to multiple devices.

Advantages

• Secure wireless power transfer
• Detuning functionality for IOT devices through resonant frequency modulation
• Wirelessly charge multiple devices using one charger