Wireless Power Transfer Control for Battery-Aware Reverse Charging
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Solution Overview
Problem
Electronic devices, such as smartphones, face reduced usability due to battery discharge when used to wirelessly charge other devices, as power consumption for charging reduces the battery's charge level.
Innovation Solution
Incorporating a control circuit and wireless power transfer circuit that adjusts power transmission based on the device's battery state, allowing for efficient charging and power management by identifying charging states and modifying power signals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electronic device provides wireless charging to an external device using its battery, then the external device can be charged wirelessly, but the battery of the electronic device is discharged, reducing the usable time of the electronic device
Solution Approach 1:
The control circuit continuously monitors the battery's charging state and uses this feedback to dynamically adjust the power signal transmission. When the battery is charging, the control circuit allows power to be transmitted to the external device; when the battery is discharged or not charging, the transmission is stopped or reduced, preventing further battery depletion
Solution Approach 2:
The wireless charging system transitions from a static on/off state to a dynamic state where power transmission is continuously adjusted based on real-time battery conditions. The control circuit modifies the power signal parameters (such as amplitude or frequency) according to the battery's charging state, enabling flexible adaptation to changing power availability
2Productivity
If the electronic device transmits high power to an external device, then charging speed is improved, but power consumption increases, reducing the battery's charge level
Solution Approach 1:
The control circuit changes the parameters of the power signal (such as power level, frequency, or amplitude) based on the battery's charging state. When external power is available and the battery is charging, higher power parameters are used to enable fast charging of the external device. When the battery is not charging or has low charge, the parameters are adjusted to reduce power consumption and preserve battery level
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
This method effectively manages power transfer, optimizing both the charging of the electronic device and the external device, thereby extending the usable time of the electronic device.
Implementation Method 1
a coil; a wireless power transfer circuit configured to be electrically connected to the coil
Data Source
AI summary
Various embodiments of the present invention relate to wireless power transfer (WPT). An electronic device comprises a battery, a charging circuit for controlling a charging state of the battery, a coil, a wireless power transfer circuit electrically connected to the coil, and a control circuit, wherein the control circuit may be configured to: check a state related to charging of the battery; transfer a wireless charging parameter related to generation or modification of a power signal for transferring to an external electronic device via the coil, which is determined at least on the basis of the state related to charging of the battery; receive a response signal corresponding to the transfer of the wireless charging parameter from the external electronic device; generate, on the basis of the response signal, a power signal corresponding to the amount of wireless transmission power determined at least on the basis of the response signal by using the wireless power transfer circuit; and transfer the power signal to the external electronic device through the coil. In addition, various embodiments are possible.