Wireless Power Receiver Alignment Detection via Electrical Parameter Thresholds
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Solution Overview
Problem
Wireless power transfer systems face challenges in ensuring compatibility and efficient power transfer between vehicles and charging systems due to variations in circuit topologies and magnetic layouts, requiring effective alignment and compatibility detection to provide sufficient charging power.
Innovation Solution
An apparatus and method that include a receiver communication circuit, sensor circuit, and controller to measure short circuit current or open circuit voltage, comparing these values to threshold parameters to initiate charging when compatibility is confirmed, ensuring efficient energy transfer and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless power transfer systems use different circuit topologies and magnetic layouts, then system versatility is improved, but compatibility between systems and vehicles deteriorates
Solution Approach 1:
The system performs preliminary detection of alignment and compatibility parameters before initiating power transfer. The receiver measures short circuit current or open circuit voltage to assess compatibility with the transmitter, ensuring that power transfer only begins when compatibility thresholds are met, thus resolving the contradiction between system versatility and compatibility reliability
Solution Approach 2:
The system implements feedback mechanisms where the receiver communicates measured parameters (short circuit current or open circuit voltage) back to the transmitter. This feedback loop enables dynamic adjustment and verification of compatibility, allowing the system to maintain reliability across diverse circuit topologies and magnetic layouts
2Ease of operation
If physical alignment between transmitter and vehicle is not optimized, then ease of operation is improved, but power transfer efficiency deteriorates
Solution Approach 1:
The system performs preliminary alignment detection by measuring parameters such as short circuit current or open circuit voltage before initiating full power transfer. This preliminary assessment ensures that sufficient alignment is achieved without requiring complex manual positioning procedures, thus maintaining ease of operation while ensuring adequate power transfer efficiency
Solution Approach 2:
The system replaces complex mechanical alignment mechanisms with electromagnetic field-based detection. By using sensor circuits to measure electrical parameters (short circuit current or open circuit voltage), the system determines alignment quality without requiring precise mechanical positioning, thereby maintaining ease of operation while achieving sufficient power transfer efficiency
3Reliability
If threshold charging parameters are set high to ensure sufficient power, then power transfer reliability is improved, but the range of compatible systems deteriorates
Solution Approach 1:
The system dynamically adjusts operating parameters based on real-time measurements of short circuit current or open circuit voltage. Rather than using fixed high thresholds that limit compatibility, the system adapts its power transfer characteristics to match the specific transmitter-receiver pairing, ensuring sufficient power delivery while maintaining compatibility across a broader range of systems
Solution Approach 2:
The system changes operational parameters (such as power level, frequency, or current) based on measured alignment and compatibility conditions. By adjusting parameters dynamically rather than enforcing fixed high thresholds, the system ensures reliable power transfer for each specific configuration while expanding the overall range of compatible transmitter and receiver combinations
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 reliable and efficient wireless power transfer by determining compatibility and optimizing alignment, ensuring vehicles receive sufficient charging power, enhancing the interoperability of wireless power transfer systems with various electric vehicles.
Implementation Method 1
a sensor circuit configured to measure a value of a short circuit current or an open circuit voltage associated with the receive coil
Data Source
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Figure 4A~4E
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AI summary
Systems, methods, and apparatuses for receiving charging power wirelessly are described herein. One implementation may include an apparatus (608) for receiving charging power wirelessly from a charging transmitter (604) having a transmit coil (614). The apparatus comprises a receiver communication circuit (639), coupled to a receive coil (618) and to a load (636). The receiver communication circuit is configured to receive information associated with at least one characteristic of the charging transmitter. The apparatus further comprises a sensor circuit (635) configured to measure a value of a short circuit current or an open circuit voltage associated with the receive coil. The apparatus further comprises a controller (638) configured to compare the value of the short circuit current or the open circuit voltage to a threshold charging parameter set at a level that provides charging power sufficient to charge the load. The controller may be further configured to initiate receiving the charging power from the charging transmitter when the short circuit current or the open circuit voltage associated with the receive coil is greater than or equal to the threshold charging parameter.