Wireless Power Receiver Identification Using Phase Difference Sensing
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Solution Overview
Problem
Existing wireless power transmission devices lack the ability to identify and adapt to different external wireless power reception devices, leading to inefficient power transmission and potential damage due to mismatched power requirements.
Innovation Solution
A wireless power transmission device equipped with a processor and power transmission circuit that identifies the type of external wireless power reception device by measuring phase differences in current or voltage and adjusts its operation mode accordingly, using phase difference information stored in memory to ensure appropriate power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless power transmission device transmits power without identifying reception device type, then power transmission can begin immediately, but power transmission efficiency deteriorates and device safety is compromised
Solution Approach 1:
The system performs device identification and type detection before initiating power transmission. The processor measures phase differences of current or voltage signals from the reception device to determine its type in advance, ensuring safe and efficient power transmission parameters are selected before energy transfer begins.
Solution Approach 2:
The system continuously monitors phase difference information from the reception device and uses this feedback to identify device type and adjust power transmission parameters accordingly. This closed-loop control ensures optimal power transmission efficiency while maintaining safety through real-time adaptation to the specific reception device characteristics.
2Measurement precision
If wireless power transmission device identifies reception device type through phase difference measurement, then power transmission accuracy improves, but device complexity increases
Solution Approach 1:
The reception device itself provides the identification information through its inherent electrical characteristics (phase difference of current or voltage). The transmission device simply measures these naturally occurring signals without requiring additional active components or complex communication protocols from the reception device side, thereby achieving accurate identification with minimal added complexity.
Solution Approach 2:
The system replaces complex mechanical or communication-based identification methods with electrical phase difference measurement. By utilizing the inherent electrical characteristics of the reception device, the system achieves device type identification through simple phase angle detection rather than requiring complex mechanical interfaces or multi-step communication handshakes.
3Adaptability or versatility
If wireless power transmission device adapts operation mode to reception device type, then adaptability improves, but control system complexity increases
Solution Approach 1:
The control system dynamically adjusts power transmission parameters based on the identified reception device type. The processor selects appropriate operation modes and transmission parameters in real-time according to the phase difference measurements, enabling the system to adapt to different device types (e.g., smartphones, tablets, laptops) without requiring separate dedicated systems for each device category.
Solution Approach 2:
The system achieves adaptability by changing key transmission parameters such as power level, frequency, and modulation scheme based on the identified reception device type. By adjusting these parameters according to phase difference information, the system provides optimized power transmission for different device categories while maintaining a unified hardware platform and control architecture.
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 efficient and safe wireless power transmission by accurately identifying and matching the power requirements of various external devices, enhancing convenience and safety in home appliances like toasters, blenders, and kettles.
Implementation Method 1
The electronic devices may be operated in an electromagnetic induction method in which a high-frequency alternating current flows through a coil to generate a magnetic field in the coil
Implementation Method 2
identify a first phase of a first current or a first voltage by an external wireless power receiver before wireless power transmission, identify a second phase of a second current or a second voltage by the external wireless power receiver through the power transmission circuit
Data Source
AI summary
A wireless power transmission device including a power transmission circuit; and at least one processor, where the at least one processor is configured to: output a first power through the power transmission circuit and identify a first phase of a first current or a first voltage by an external wireless power receiver before wireless power transmission, identify a second phase of a second current or a second voltage by the external wireless power receiver through the power transmission circuit while outputting the first power, identify a difference between the first phase and the second phase, identify a difference between the first phase and the second phase, identify the external wireless power receiver based on the difference between the first phase and the second phase, and control the power transmission circuit to transmit a second power to the identified external wireless power receiver.