System and method for non-contact interaction with mobile devices
AssigneeTexas Tech University System
InventorsChenhui Liu, Changzhi Li, Changzhan Gu
Life of this patent
Estimating the term…
Abstract
Disclosed is a system and method for controlling handheld devices without contact by interacting with their wireless charging coils or other inductive coil antennae. The present disclosure utilizes the interaction between human body and the coil wherein the coil is used to send alternating magnetic field to interact with a control signal, such as a hand, instead of simply using the coil in the smart phone as a power receiver. The hand movement in front of the wireless charging coil changes the coil's conductivity distribution, which creates effective coil impedance also known as reflected impedance.
Claims13
A control circuit suitable for contactless interaction with a mobile device, the circuit configured to control the functionality of a mobile device, the control circuit comprising:
- a power supply,
- an oscillator circuit configured to electromagnetically engage a control element, the oscillator circuit comprising:
- at least one inductive coil,
- a gain device,
- and a parallel LC circuit,
- the at least one inductive coil configured to generate a resonant frequency and to generate an electromagnetic field,
- the oscillator circuit configured to enable the control element to vary the resonant frequency of the at least one inductive coil without contacting the mobile device, wherein certain functionality within the mobile device can be controlled by varying the resonant frequency of the oscillator circuit.
Dependencies are inferred from the claim text.