Wireless Charging Control Using Motion-Based Impedance Adjustment
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Solution Overview
Problem
The power transfer efficiency and reception power stability of wireless power receivers are compromised when the distance between a wireless power transmitter and multiple receivers changes due to movement, leading to fluctuations in coupling and impedance.
Innovation Solution
An electronic device with a sensor, resonance circuit, rectification circuit, DC/DC converter, and controller adjusts impedance by detecting movement and controlling the DC/DC converter's output based on voltage values to stabilize reception power and enhance overall power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between wireless power transmitter and receivers remains fixed, then power transfer efficiency and reception power stability are maintained, but device mobility and adaptability are reduced
Solution Approach 1:
The patent implements dynamic impedance adjustment in the wireless power receiver based on detected movement. The controller modifies impedance parameters in real-time according to the receiver's position and movement state, enabling the system to adapt to changing distances and maintain stable power reception despite mobility.
Solution Approach 2:
The patent employs feedback mechanisms where sensors detect movement and position of the wireless power receiver, and this information is fed back to the controller which adjusts impedance accordingly. This closed-loop control ensures stable power transfer efficiency even when distance variations occur due to device mobility.
2Productivity
If impedance is dynamically adjusted in response to movement, then power transfer efficiency and reception power stability are improved, but device complexity increases
Solution Approach 1:
The patent changes electrical impedance parameters dynamically based on movement detection. By adjusting impedance values in response to position changes, the system maintains optimal power transfer efficiency without requiring fundamentally new hardware architectures, thus managing complexity through parameter modulation rather than structural complexity.
Solution Approach 2:
The patent replaces mechanical positioning systems with electromagnetic field-based detection and control. Instead of mechanically adjusting components to maintain optimal coupling, the system uses sensor-based movement detection combined with electrical impedance adjustment, substituting mechanical complexity with electrical control.
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 solution increases power transfer efficiency and stabilizes reception power by dynamically adjusting impedance in response to movement, ensuring consistent charging performance across wireless power receivers.
Implementation Method 1
a resonance circuit configured to wirelessly receive power based on an external electromagnetic field
Implementation Method 2
a rectification circuit configured to rectify an alternating current (AC) power provided from the resonance circuit into a direct current (DC) power
Data Source
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AI summary
The disclosure provides an electronic device and a method for controlling wireless charging in the electronic device. An electronic device includes: a sensor, a battery, a resonance circuit configured to wirelessly receive power, a rectification circuit configured to rectify an alternating current (AC) power provided from the resonance circuit into a direct current (DC) power, a DC/DC converter configured to convert the DC power provided from the rectification circuit to output a converted power, a charging control circuit configured to charge the battery using the converted power provided from the DC/DC converter, and a controller, and the controller may be configured to: identify movement information of the electronic device corresponding to a value sensed via the sensor, identify a voltage value of the DC power rectified via the rectification circuit, and control an output of the DC/DC converter based on the movement information and the voltage value.