Wireless Charging Coil Control Using Impedance and Motion Sensing
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Solution Overview
Problem
Existing wireless power transmission technologies face challenges in efficiently determining the optimal operating mode between transmission and reception, particularly in scenarios where impedance variations and motion changes occur.
Innovation Solution
An electronic device equipped with a converter for DC/DC power conversion, a power conversion circuit for AC/DC conversion, a coil, a motion sensor, and processors that execute instructions to identify impedance and motion variations, set a delay time, and transmit driving power to an external device based on these conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic device continuously monitors impedance and motion to determine optimal operating mode, then the reliability of power transmission/reception is improved, but the energy consumption increases
Solution Approach 1:
The system performs periodic monitoring of impedance and motion parameters at specific intervals rather than continuously, enabling the device to determine optimal operating modes while reducing energy consumption during standby states. The controller activates monitoring only when needed based on detected changes.
Solution Approach 2:
The system performs preliminary detection of impedance variations and motion changes before actually switching operating modes. This allows the device to anticipate mode changes and prepare accordingly, improving reliability while avoiding unnecessary continuous monitoring.
2Measurement precision
If the electronic device uses multiple sensors and detection mechanisms to identify impedance and motion variations, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The controller is designed to perform multiple functions: it detects impedance variations, monitors motion sensor output, determines operating modes, and controls power transmission/reception. This multi-functionality reduces the need for separate dedicated components for each function, maintaining measurement precision while managing device complexity.
Solution Approach 2:
The system combines impedance detection and motion sensing into a unified control framework where the controller integrates signals from both sources to determine operating modes. This merging allows cross-validation of detection data, improving precision without proportionally increasing complexity.
3Stability of the object's composition
If the electronic device implements delay time based on motion variation thresholds, then the stability of power transmission is improved, but the response time deteriorates
Solution Approach 1:
The system dynamically adjusts the delay time based on the magnitude of motion variation detected. When motion variation exceeds a threshold, a longer delay is applied to ensure stability; when motion is minimal, the delay is reduced or eliminated, maintaining responsiveness. This dynamic adjustment balances stability and response time.
Solution Approach 2:
The controller changes the timing parameters (delay time) based on detected motion variation levels. By adjusting this parameter dynamically according to operational conditions, the system optimizes both stability during mode transitions and overall response time to changing conditions.
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 enables the electronic device to accurately identify impedance and motion variations, thereby determining the appropriate operating mode and ensuring efficient power transmission or reception, reducing standby power consumption and improving overall system efficiency.
Implementation Method 1
The wireless power transmission technology using the magnetic induction scheme is a scheme for transferring power by the electromagnetic field induced in the coil. The wireless power transmission device applies a current to the transmission coil to generate an electromagnetic field
Data Source
AI summary
An electronic device is provided. The electronic device includes a converter that is configured to perform a direct current (DC)/DC power conversion operation, a power conversion circuit that is electrically or operatively connected to the converter and configured to perform an alternating current (AC)/DC power conversion, a coil electrically or operatively connected to the power conversion circuit, a motion sensor that is configured to detect a motion of the electronic device, memory storing one or more computer programs and one or more processors communicatively coupled to the memory and the converter, the power conversion circuit, or the motion sensor, wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors individually or collectively, cause the electronic device to identify an impedance variation at at least one point in the electronic device, identify a motion variation in the electronic device through the motion sensor based on the impedance variation exceeding a first reference value, set a delay time on the basis that the motion variation is greater than a second reference value, and transmit first driving power to an external electronic device via the coil according to an elapse of the delay time.