Wireless Inductive Power Frequency Convergence
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in achieving optimal communication performance and power transfer efficiency, particularly at lower coupling factors between inductive coils, leading to increased communication errors and suboptimal performance.
Innovation Solution
A power transmitter with a variable resonance circuit and an adaptor that converges the operating frequency and resonance frequency based on a demodulation quality measure, reducing intermodulation distortion while maintaining acceptable communication characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transfer is implemented with loose coupling between coils, then user convenience and ease of operation improve, but communication reliability and power transfer efficiency deteriorate
Solution Approach 1:
The patent implements dynamic frequency tuning where the power transmitter continuously adjusts its operating frequency to match the resonant frequency of the power receiver. This dynamic adaptation allows the system to maintain optimal communication and power transfer conditions even when coil coupling varies, thereby preserving reliability while enabling loose coupling for user convenience.
Solution Approach 2:
The system changes the operating frequency parameter dynamically to optimize performance. By tuning the frequency to match resonant conditions between transmitter and receiver coils, the system overcomes the degradation in communication reliability that would normally occur with loose coupling, thus resolving the contradiction between ease of operation and communication reliability.
2Device complexity
If fixed frequency operation is used, then device complexity is reduced, but power transfer efficiency and communication performance deteriorate at lower coupling factors
Solution Approach 1:
The patent introduces dynamic frequency tuning capability that allows the power transmitter to automatically adjust its operating frequency based on real-time conditions. This dynamic behavior enables the system to maintain high power transfer efficiency and communication performance across varying coupling conditions without requiring complex manual configuration, thus resolving the contradiction between simplicity and productivity.
Solution Approach 2:
The system employs feedback mechanisms where the power transmitter monitors communication quality and power transfer performance, then adjusts the operating frequency accordingly. This closed-loop control ensures optimal efficiency is maintained dynamically, overcoming the limitations of fixed frequency operation while keeping the system relatively simple through automated adaptation.
3Object-generated harmful factors
If frequency convergence between operating and resonance frequencies is implemented, then intermodulation distortion is reduced, but device complexity increases
Solution Approach 1:
The patent implements dynamic frequency convergence where the operating frequency is continuously adjusted to match the resonant frequency. This dynamic tuning eliminates intermodulation distortion by ensuring frequencies remain converged under varying operating conditions, while the automation of this process keeps the added complexity manageable through integrated control algorithms.
Solution Approach 2:
The system performs self-adjustment of frequencies through automated tuning mechanisms. The power transmitter independently monitors and adjusts its operating frequency to maintain convergence with the resonant frequency, eliminating the need for complex external control systems while effectively reducing intermodulation distortion.
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 improves power transfer efficiency and communication reliability by mitigating intermodulation distortion and adapting frequencies to optimize power transfer and communication performance, especially at lower coupling factors.
Implementation Method 1
a variable resonance circuit for generating an inductive power signal in response to a drive signal
Implementation Method 2
the variable resonance circuit having a resonance frequency being a variable resonance frequency
Data Source
AI summary
A wireless power transfer system includes a power receiver and a power transmitter providing power to this using an inductive power signal. The power transmitter comprises a variable resonance circuit (201) having a variable resonance frequency and generating the inductive power signal. A driver (203) generates the drive signal and a load modulation receiver (303) demodulates load modulation of the inductive power signal. An adaptor (305) adapts the operating frequency and the resonance frequency to converge, and specifically is arranged to control the operating frequency and the resonance frequency to be substantially the same. The adaptation of the operating frequency and the resonance frequency is further in response to a demodulation quality measure. The invention may allow improved communication, and in particular may reduce intermodulation distortion.