Wireless Power Receiver Adaptive Impedance for Data Communication
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Solution Overview
Problem
Existing wireless charging systems face challenges in effectively transmitting data between devices with different magnetic coupling coefficients, as conventional methods may not induce sufficient amplitude or phase changes in the sensing circuit of the wireless power transmitting device.
Innovation Solution
A wireless power receiving device is designed to switch between two data communication modes based on the magnetic coupling coefficient, using different capacitor configurations and rectifier modes to ensure adequate signal strength, and dynamically adjusts an adjustable capacitive bank to maintain effective communication with various wireless power transmitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a switching circuit is used to modulate the load across the coil in the wireless power receiving device, then data communication between devices is enabled, but the amplitude or phase change at the sensing circuit of the wireless power transmitting device may be insufficient for detection
Solution Approach 1:
The patent applies parameter changes by switching between different capacitor configurations (first and second capacitor banks with different capacitance values) and rectifier modes (full-bridge and half-bridge) to optimize the load modulation parameters. This allows the system to adjust the amplitude and phase characteristics of the modulated signal to ensure detectability by the transmitting device's sensing circuit while maintaining data communication capability.
Solution Approach 2:
The patent implements dynamics through the controller that dynamically selects between different capacitor configurations and rectifier modes based on communication requirements. The system can switch between full-bridge rectifier mode with one capacitor configuration and half-bridge rectifier mode with another capacitor configuration, enabling adaptive optimization of the load modulation signal for different communication scenarios.
2Reliability
If different capacitor configurations are used for different magnetic coupling coefficients, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a single wireless power receiving device that can operate with multiple capacitor configurations and rectifier modes. The same receiving device can adapt to different magnetic coupling coefficients by switching between full-bridge and half-bridge rectifier modes with appropriate capacitor banks, making the device universally compatible with various transmitting device coil configurations without requiring multiple specialized devices.
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 enables robust data transmission between wireless power transmitting and receiving devices with different coupling coefficients, ensuring reliable communication and efficient power transfer by optimizing impedance changes and rectification modes.
Implementation Method 1
a wireless power transmitting coil, a wireless power receiving coil, wireless power transmitting circuitry coupled to the wireless power transmitting coil and operable to wirelessly transmit power to the wireless power receiving coil
Implementation Method 2
the wireless power receiving coil is coupled to wireless power receiving circuitry. The wireless power receiving circuitry is coupled to a capacitor bank and rectifier circuitry. The rectifier circuitry is operable in a full-bridge rectifier mode during the first data communications mode and in a half-bridge rectifier mode during the second data communications mode
Data Source
AI summary
A wireless power transmission system has a wireless power receiving device that can be charged using multiple different types of wireless power transmitting devices. The different types of wireless power transmitting devices have power transmitting coils that exhibit different levels of magnetic coupling with the power receiving coil of the wireless power receiving device. The wireless power receiving device may include capacitors, resistors, and/or other loading circuits that can be independently switched into use depending on the level of magnetic coupling that is detected, on a rectified voltage level, on the size of the output load, and/or on information conveyed during handshaking operations to present a desired impedance adjustment at the power receiving coil so that data signal can be properly conveyed between the power receiving device and the power transmitting device.