Wireless Power Transmitter Control for False Alert Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power transfer systems are limited to small separation gaps between transmitter and receiver coils, preventing effective charging through furniture or with device cases, and lack control over receiver faults leading to false notifications.
Innovation Solution
A wireless power transmitter with a ferrite core structure and precision power control, operating at 87-205 kHz, allows extended separation gaps up to 15 mm and suppresses false notifications by using a sensing system and feedback mechanism with LED alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the separation gap between transmitter and receiver coils is increased beyond 3-5 mm, then wireless charging through furniture and with device cases becomes possible, but the magnetic coupling efficiency and power transfer performance deteriorate
Solution Approach 1:
The patent employs ferrite shielding materials with specific magnetic properties to enhance and extend the magnetic field from the transmitter coil. The ferrite core and shields create a composite magnetic circuit that maintains field strength over larger distances, enabling effective power transfer at separation gaps exceeding 3-5 mm while preserving coupling efficiency.
Solution Approach 2:
The patent transitions from planar coil configurations to three-dimensional ferrite core structures with multiple shields positioned at different spatial locations. This dimensional expansion creates a more robust magnetic field distribution that maintains coupling effectiveness over increased separation distances.
2Device complexity
If the transmitter operates without control over receiver faults, then the system remains simple, but false notifications from receiver hardware faults degrade user experience
Solution Approach 1:
The patent implements a feedback mechanism where the transmitter monitors communication signals from the receiver to detect hardware faults. When faults are detected, the system adjusts its operation or notifies the user appropriately, preventing false notifications while maintaining system simplicity through intelligent monitoring rather than complex control.
Solution Approach 2:
The receiver performs self-diagnosis of its hardware status and communicates fault information to the transmitter. This self-service approach allows the transmitter to respond appropriately to actual receiver conditions without requiring complex transmitter-side fault detection, maintaining simplicity while improving notification accuracy.
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
Enables wireless charging through larger gaps with improved user experience by reducing false alerts and enhancing compatibility with off-the-shelf power supplies.
Implementation Method 1
a ferrite core that substantially surrounds the transmitter antenna on three sides
Implementation Method 2
inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field, and hence, an electric current, in a receiving element
Implementation Method 3
a sensing system and feedback mechanism with LED alerts
Data Source
AI summary
A power transmitter for wireless power transfer includes a sensing system, a feedback mechanism and a control and communications unit includes a controller configured to receive object detection data from the sensing system, if a power receiver is detected, reset an alert timer, if the power receiver has been detected and a disconnect is detected, determine if an alert timer value is greater than an alert threshold, if a disconnect is detected and the alert timer value is greater than the alert threshold, instruct the feedback mechanism to output an alert. The power transmitter further includes an inverter circuit configured to receive a direct current (DC) power and convert the input power to a power signal and a coil configured to transmit the power signal to a power receiver, the coil formed of wound Litz wire and including at least one layer, the coil defining, at least, a top face.