Wireless Charging Control Circuit for Power Signal Adjustment
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Solution Overview
Problem
Conventional wireless charging technologies face inefficiencies and safety issues due to misalignment between charging devices, leading to voltage fluctuations, noise, and high temperatures, and they may reduce power transfer efficiency and generate harmful electromagnetic waves.
Innovation Solution
An electronic device with a conductive pattern, an adjustment circuit, and a control circuit that generates a power control signal to adjust the intensity of the power signal received from an external power transmitting device, optimizing charging efficiency and safety by controlling power transmission based on alignment, temperature, and motion recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If magnetic resonance scheme is used to supply power over several meters, then power transmission distance is improved, but power transfer efficiency deteriorates and harmful electromagnetic waves are generated
Solution Approach 1:
The patent changes the fundamental parameter of power transmission from magnetic resonance to electromagnetic induction, operating at high frequency (2.45 GHz) to achieve both efficient power transfer and extended transmission distance through wave-based energy propagation
2Length of stationary object
If magnetic resonance scheme is used to supply power over several meters, then power transmission distance is improved, but harmful electromagnetic waves are generated
Solution Approach 1:
The patent changes the transmission mechanism to electromagnetic induction at 2.45 GHz, using standing wave patterns and node positioning to confine energy transfer spatially, thereby reducing harmful electromagnetic radiation while maintaining transmission distance
3Ease of operation
If electronic device and wireless charging pad are misaligned, then ease of operation is improved, but voltage swing and noise occur leading to reduced reliability
Solution Approach 1:
The patent implements dynamic power adjustment by detecting the position of the electronic device on the charging pad and automatically adjusting the power transmission level, allowing misalignment tolerance while maintaining charging reliability through real-time adaptation
Solution Approach 2:
The patent uses feedback from position detection to control power transmission levels, creating a closed-loop system that adjusts charging parameters based on actual device placement, thereby maintaining reliability despite alignment variations
4Ease of operation
If conventional wireless charging is used with misalignment, then ease of operation is improved, but high temperature occurs leading to safety issues
Solution Approach 1:
The patent dynamically adjusts power transmission based on detected device position and temperature conditions, reducing power levels when misalignment is detected to prevent excessive heat generation while maintaining operational ease
Solution Approach 2:
The patent implements temperature and position feedback mechanisms that automatically reduce or interrupt power transmission when unsafe conditions are detected, preventing overheating while allowing flexible device placement
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 enhances charging efficiency and safety by stabilizing power transfer, preventing overheating, and reducing electromagnetic interference, while ensuring reliable and efficient wireless charging.
Implementation Method 1
a conductive pattern in which a current is induced based on a power signal transmitted by the external power transmitting device
Data Source
AI summary
An electronic device which is wirelessly charged through an external power transmitting device includes a conductive pattern in which a current is induced depending on a power signal transmitted by the external power transmitting device, an adjustment circuit that configured to generate a voltage signal using the current, a load configured to be charged through the voltage signal, and a control circuit electrically connected with the conductive pattern, the adjustment circuit, and the load. Upon recognizing the external power transmitting device, the control circuit is configured to generate a power control signal including information about intensity of the power signal and to transmit the power control signal to the external power transmitting device through the conductive pattern, and the conductive pattern is configured to receive the power signal, the intensity of which is changed depending on the power control signal.