Wireless Power Coil Mode Detection for Reliable Receiver-Transmitter Switching
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in accurately detecting and switching between wireless power receiver and transmitter modes, particularly in scenarios where standard protocols like Qi may not be sufficient for seamless communication and power transfer.
Innovation Solution
The system employs inductive detection techniques, including handshake data exchange through repeated activation and deactivation of the inverter, measurement of electrical or magnetic properties, and alternative communication channels like Bluetooth, WiFi, or NFC, to identify accessories and switch modes efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard wireless power transfer protocols are used, then basic power transfer functionality is achieved, but detection accuracy and mode switching reliability are insufficient
Solution Approach 1:
The detection process is divided into multiple sequential stages: initial object detection using low-power pings, identification of detector type through timeout period analysis, and final mode determination. This segmentation allows the system to achieve reliable detection without continuously operating complex detection circuits, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The system performs preliminary detection actions before committing to full power transfer mode. Low-power ping signals are sent first to detect presence, followed by timeout period measurements to identify detector type. This preliminary action prevents premature mode switching and ensures reliable detection before activating complex power transfer sequences.
2Measurement precision
If continuous detection and communication are performed, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
Instead of continuous detection, the system uses periodic low-power ping signals at specific intervals. The detector responds periodically, allowing the system to achieve accurate detection through time-based sampling rather than continuous monitoring. This periodic approach maintains detection accuracy while significantly reducing power consumption compared to continuous operation.
Solution Approach 2:
The detection system uses the detector's own response behavior to provide detection information. By analyzing the timeout period before the detector responds to ping signals, the system can identify detector type and confirm presence without requiring additional active components or continuous power consumption from the detector itself.
3Adaptability or versatility
If multiple detection methods are implemented, then compatibility with various devices is enhanced, but system complexity increases
Solution Approach 1:
The system implements a universal detection approach that works with multiple detector types (Qi detectors, non-Qi detectors, foreign objects) using a single unified protocol. By analyzing the timeout period responses to standard ping signals, the system can identify and adapt to different detector types without requiring separate detection circuits or protocols for each device type, achieving versatility without proportional complexity increase.
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 precise detection and switching between wireless power transfer modes, ensuring compatibility with various devices and enhancing user experience by minimizing communication failures and optimizing power transfer efficiency.
Implementation Method 1
a rectifier coupled to the wireless power transfer coil and operable in the wireless power receiver mode to convert an AC voltage induced in the wireless power transfer coil by a wireless power transmitter to a DC voltage
Data Source
AI summary
An electronic device can be selectively operable in a wireless power receiver mode to receive power from a wireless power transmitter and in a wireless power transmitter mode to transmit power to an accessory. The electronic device can include a wireless power transfer (WPT) coil; a rectifier coupled to the WPT coil and operable in the wireless power receiver mode to convert an AC voltage induced in the WPT coil by a wireless power transmitter to a DC voltage for use by the electronic device; an inverter coupled to the WPT coil and operable in the wireless power transmitter mode to convert a DC voltage to an AC voltage applied to the WPT coil; and controller and communication circuitry that, responsive to detection of an accessory, activates the wireless power transmitter mode; and, responsive to detection of a wireless power transmitter, activates the wireless power receiver mode.