Wireless Charging Surface With Piezoelectric Device Detection
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Solution Overview
Problem
Existing wireless power transmission systems experience power loss during the detection of power receiving devices due to inefficient detection methods, necessitating a need for cost-effective and convenient solutions.
Innovation Solution
A power transmitter device comprising a cover layer, sensor layer, and transmitter layer, which uses piezoelectric sensors to convert mechanical pressure from power receiving devices into electrical signals, allowing for precise detection and reduced power loss by scanning with analog ping signals only when a response is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If the power transmitting device continuously sends analog ping signals to detect power receiving devices, then the detection capability is improved, but power loss increases
Solution Approach 1:
The patent replaces the continuous electromagnetic ping signal detection with a mechanical pressure detection system using piezoelectric sensors. When a power receiving device is placed on the charging surface, it applies mechanical pressure to the piezoelectric sensors, which generate electrical signals indicating the presence of a device. This mechanical substitution eliminates the need for continuous electromagnetic pinging, significantly reducing power loss while maintaining effective detection capability.
2Loss of energy
If the power transmitting device uses piezoelectric sensors to detect mechanical pressure, then power loss is reduced, but detection precision may be compromised
Solution Approach 1:
The patent introduces an intermediary mechanical pressure transmission layer between the power receiving device and the piezoelectric sensors. This layer ensures uniform distribution of mechanical pressure across the sensor array, enhancing detection precision. The intermediary layer also amplifies the mechanical pressure signal, allowing the piezoelectric sensors to accurately detect the presence and position of power receiving devices while consuming minimal power.
3Loss of energy
If analog ping signals are sent only when mechanical pressure is detected, then power efficiency is improved, but detection response time may increase
Solution Approach 1:
The patent implements preliminary mechanical pressure detection using piezoelectric sensors before initiating analog ping signal transmission. The piezoelectric sensors continuously monitor for mechanical pressure without consuming significant power, and immediately trigger the analog ping transmission when pressure is detected. This preliminary action ensures that the system responds rapidly to the presence of a power receiving device while maintaining power efficiency by avoiding continuous pinging.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system reduces power loss during idle times by efficiently detecting power receiving devices through mechanical stress conversion, enabling cost-effective and convenient wireless power transmission.
Implementation Method 1
sensors of the power transmitting device to convert mechanical pressure generated by the power receiving device or devices to an electrical signal or signals
Implementation Method 2
a portable device (e.g., portable phones, portable media players, electronic watches, tablets, laptops, portable medical devices, portable power tools, portable home appliances, portable batteries, electric vehicles, robots, drones, and the like) can be charged by magnetic induction between the transmitter coil(s) of a wireless charger and the receiver coil(s) of the portable device
Data Source
AI summary
Systems, devices, and methods for wirelessly transmitting power are provided. Devices in accordance with embodiments of the present invention include a transmitter layer, a sensor layer disposed on the transmitter layer, and a cover disposed on the sensor layer. With the systems, devices, and methods, power can be wirelessly transmitted effectively and efficiently.