Inductive Wireless Charging Control for Interference-Free Data Exchange
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Solution Overview
Problem
Existing wireless power transfer systems using inductive coupling face challenges in achieving reliable and flexible operation, particularly in managing magnetic interference during data exchange and determining optimal energy transmission parameters.
Innovation Solution
The system controls the power coil during data exchange to minimize magnetic interference, allowing for simultaneous data transmission and energy transfer. It uses a dual-level power supply to enable impedance measurements and self-resonance frequency determination, optimizing energy transmission parameters and detecting foreign objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power coil is controlled to generate alternating magnetic field for wireless energy transmission, then energy transfer capability is improved, but magnetic interference during data exchange increases
Solution Approach 1:
The system alternates between power transmission mode and data exchange mode in periodic cycles. During data exchange periods, the power coil is deactivated or operated at reduced power to minimize magnetic interference, while during power transmission periods, the full power is applied for efficient energy transfer. This periodic switching resolves the contradiction by separating the two functions in time.
Solution Approach 2:
The control system dynamically adjusts the power coil operation based on the current mode (power transmission or data exchange). The system transitions between different operational states with optimized parameters for each mode, allowing flexible adaptation to minimize interference during communication while maintaining high power transfer efficiency when needed.
2Adaptability or versatility
If data exchange is performed during power transmission, then system flexibility is improved, but measurement precision deteriorates due to magnetic interference
Solution Approach 1:
Impedance measurements and self-resonance frequency determinations are performed during dedicated measurement periods before full power transmission begins. This preliminary measurement approach ensures accurate data collection without the interference of high-power magnetic fields, while still enabling flexible simultaneous operation during subsequent power transmission phases.
Solution Approach 2:
The system uses low-voltage power supply levels as an intermediary state that enables both data exchange and impedance measurements without the harmful effects of high-power operation. This intermediate operating state allows the communication coil to function properly while providing sufficient power for measurements, bridging the gap between full power transmission and idle states.
3Productivity
If dual-level power supply is used for optimization, then energy transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The dual-level power supply system serves multiple functions: it provides optimized voltage levels for different operational modes (power transmission, data exchange, measurements), enables impedance measurements during low-voltage periods, and supports self-resonance frequency determination. This multi-functionality justifies the added complexity by consolidating multiple optimization tasks into a unified power management 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
This approach ensures reliable and flexible wireless power transfer by allowing simultaneous data exchange and energy transmission, optimizing energy transfer efficiency, and detecting foreign objects, thereby enhancing system performance and safety.
Implementation Method 1
device for wirelessly transmitting energy towards an electrical consumer by means of inductive coupling
Implementation Method 2
communication coil configured separately from the power coil and configured to exchange data bidirectionally with the electrical load
Implementation Method 3
the power coil is controlled in such a way that, despite the alternating magnetic field generated by the power coil, a data exchange via the communication coil is still possible
Data Source
Figure 1
Figure 2
AI summary
Method for operating a device (100) for wirelessly transmitting energy towards an electrical consumer (200) by means of inductive coupling, wherein the device comprises: - a power coil (101) configured to generate an alternating magnetic field for transmitting the energy, and - a communication coil (112) configured separately from the power coil (101) and configured to exchange data bidirectionally with the electrical consumer (200), - wherein during a data exchange via the communication coil (112) the power coil (101) is controlled in such a way that data exchange via the communication coil (112) is possible despite the alternating magnetic field generated by the power coil (101).