Negative Modulation Correction in Fixed Coil Wireless Power
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Solution Overview
Problem
Negative modulation in wireless power transmission systems causes voltage drops, oscillations, and system instability, leading to potential disconnections and battery charging interruptions, especially due to high receiver coil inductance or improper coil geometry.
Innovation Solution
A method to detect negative modulation and adjust parameters such as output voltage, transmitter input voltage, or receiver structural elements to transition from negative to positive modulation, using a processor-controlled system that adjusts capacitances and communication signals to maintain stable power and frequency output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high receiver coil inductance is used to improve power transfer efficiency, then power transfer efficiency is improved, but negative modulation occurs causing voltage drops and system instability
Solution Approach 1:
The patent applies dynamics by making the compensation capacitance value adjustable and adaptive rather than fixed. The system dynamically changes the compensation capacitance based on detected modulation conditions, transitioning from a static circuit design to a dynamic control system that adapts to varying operating conditions to prevent negative modulation while maintaining high inductance for efficient power transfer
Solution Approach 2:
The patent changes the electrical parameter (capacitance value) to resolve the contradiction. By adjusting the compensation capacitance in parallel with the receiver coil, the system modifies the resonant frequency and impedance characteristics to eliminate negative modulation effects while preserving the high inductance necessary for efficient wireless power transfer
2Ease of manufacture
If improper coil geometry is used to simplify manufacturing, then ease of manufacture is improved, but negative modulation occurs causing oscillations and charging interruptions
Solution Approach 1:
The patent introduces a compensation capacitance as an intermediary element that mediates between the coil geometry and the electrical performance. This intermediary component compensates for the adverse effects of improper coil geometry by adjusting the resonant characteristics, thereby eliminating negative modulation and oscillations without requiring complex coil manufacturing
3Device complexity
If fixed coil design is used to reduce device complexity, then device complexity is reduced, but the system cannot adapt to negative modulation under varying conditions
Solution Approach 1:
The patent transforms the fixed coil design into a dynamic system by adding controllable capacitance elements. The system can adapt its electrical characteristics in real-time based on operating conditions, enabling it to handle negative modulation scenarios without requiring multiple fixed coil designs or complex mechanical adjustments
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 effectively mitigates negative modulation, ensuring stable voltage and preventing disruptions in wireless charging by adapting the system to maintain positive modulation, thereby enhancing system stability and reliability.
Implementation Method 1
a transmitter coil that is driven to produce a time-varying magnetic field and a receiver coil that is positioned relative to the transmitter coil to receive the power transmitted in the time-varying magnetic field
Data Source
AI summary
In accordance with some embodiments of the present invention, a method of controlling and correcting negative modulation is presented. In some embodiments, a method of operating a receiver includes detecting a negative modulation and adjusting one or more parameters to force a transition to a positive modulation. The parameters can be the output voltage Vout, the transmitter input voltage Vin, or receiver structural elements.