Wireless Power Transmission Circuit with Wired Charging Detection
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Solution Overview
Problem
Conventional electronic devices cannot wirelessly supply electric power stored in a battery to an external device, limiting their functionality in sharing power between devices.
Innovation Solution
An electronic device equipped with a wireless interface, including a coil, and a processor that enables wireless power transmission from the battery to an external device, while also managing power from a wired charging source, allowing for efficient power sharing and switching between charging and transmission modes based on battery capacity and external power availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wired charging device is connected to charge the battery, then the battery can be charged by receiving electric power from the wired charging device, but the electronic device cannot wirelessly supply electric power to an external device
Solution Approach 1:
The charging circuit is designed to perform multiple functions: it can charge the battery from a wired charging device, wirelessly transmit power to external devices, and switch between these modes. The controller enables the same circuit infrastructure to serve both power reception and power transmission purposes, eliminating the need for separate dedicated circuits for each function.
2Adaptability or versatility
If the electronic device wirelessly transmits electric power to an external device, then power sharing is enabled, but the battery capacity may be depleted while the device itself needs power
Solution Approach 1:
The controller continuously monitors the battery's remaining capacity and the charging state of both the electronic device and external device. Based on this feedback, the controller dynamically adjusts or stops wireless power transmission to prevent battery depletion, ensuring the device maintains sufficient power for its own operations while enabling power sharing when safe.
Solution Approach 2:
The wireless charging mode is designed to be dynamically controllable rather than fixed. The controller can switch between different power transmission states (active, reduced, or stopped) based on real-time battery status, allowing the system to adapt its power sharing behavior to current conditions and maintain reliability.
3Productivity
If the charging circuit is configured to charge the battery only, then the configuration is simple, but it cannot simultaneously supply power to an external device while charging
Solution Approach 1:
The controller manages power distribution by selectively activating different circuit paths based on current needs. When wireless power transmission is required, the controller activates the power transmission path while managing the charging path to ensure sufficient power for the device, rather than maintaining all paths at full capacity, thus balancing efficiency and complexity.
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 the electronic device to wirelessly transmit power to external devices, optimize power usage, and charge its battery simultaneously, enhancing power management and device interoperability.
Implementation Method 1
produce an induction current through a coil by a magnetic induction method, thereby charging the battery
Data Source
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AI summary
According to various embodiments, an electronic device comprises a battery, a wireless interface including a coil and configured to wirelessly transmit electric power from the battery via the coil, and at least one processor configured to: perform a wireless charging function of wirelessly transmitting electric power to an external device via the wireless interface, while neither the electronic device nor the external device is being supplied with electric power from an external power source via a wire, and based on identifying that the external device starts being supplied with electric power from an external power source via a wire while performing the wireless charging function, stop performing the wireless charging function of wirelessly transmitting electric power to the external device.