Wireless Power Receiver Automatic Tuning Assist Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power transmission systems face challenges in maintaining high efficiency over long ranges due to fluctuations in resonance frequencies, making it difficult to automatically tune the resonance frequency for optimal power transfer.
Innovation Solution
The implementation of an automatic tuning assist circuit in wireless power transmitting and receiving apparatuses, which includes a transmission or reception coil, auxiliary capacitors, and switches controlled by a unit to adjust the phase and frequency of the driving voltage, allowing for quasi-resonant states without adjusting the capacitance of the resonance capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electromagnetic induction method is used for wireless power transmission, then power transmission efficiency is high (60%-98%), but transmission range is limited to short distance (several cm or less)
Solution Approach 1:
The patent transitions from electromagnetic induction (low frequency, short range) to magnetic field resonance (higher frequency, longer range) by changing the operating parameters. The resonance frequency is adjusted to match between transmitter and receiver, enabling efficient power transmission over several meters while maintaining high efficiency through resonant coupling between coils.
2Length of stationary object
If transmission range is extended to several meters using electromagnetic wave reception method, then transmission distance is improved, but power transmission efficiency becomes small
Solution Approach 1:
The patent implements automatic frequency tuning mechanisms that dynamically adjust the resonance frequency of both transmitter and receiver coils to maintain optimal coupling conditions. This dynamic adjustment ensures high transmission efficiency is maintained across varying distances up to several meters, overcoming the efficiency loss problem of conventional electromagnetic wave reception methods.
3Loss of energy
If resonance frequency is adjusted manually to achieve optimal power transmission, then power transmission efficiency is improved, but operation complexity increases due to difficulty in tuning fluctuating resonance frequency
Solution Approach 1:
The patent incorporates automatic frequency tuning circuits and control systems that self-adjust the resonance frequency based on real-time coupling conditions between transmitter and receiver. The system automatically detects frequency drift and adjusts capacitor values or coil parameters to maintain resonance, eliminating the need for manual tuning while preserving high transmission efficiency.
4Adaptability or versatility
If resonance frequency fluctuates due to various factors, then adaptability to different conditions is improved, but stability of resonance frequency deteriorates making automatic tuning difficult
Solution Approach 1:
The patent implements feedback control systems that continuously monitor the resonance frequency and coupling conditions between transmitter and receiver. Based on this feedback, the system automatically adjusts operating parameters to compensate for frequency fluctuations caused by environmental factors, load changes, or coil positioning, thereby maintaining stable and efficient power transmission across varying conditions.
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 solution enables automatic tuning of resonance frequencies, ensuring high-efficiency electric power transmission over varying distances by maintaining phase matching between the resonance current and driving voltage, even without adjusting the capacitance of the resonance capacitor, thus enhancing power transfer efficiency.
Implementation Method 1
Wireless power transmission can be classified into three principal methods using an electromagnetic induction, an electromagnetic wave reception, and an electric field/magnetic field resonance
Implementation Method 2
The resonance frequency of the transmitter side LC resonance circuit is represented by fTX=1/(2π√(LTX·CTX)). The resonance frequency of the receiver side LC resonance circuit is represented by fRX=1/(2π√(LRX·CRX))
Implementation Method 3
The first control unit is configured to switch on and off the multiple switches in synchronization with the driving voltage... enabling automatic tuning of resonance frequencies, ensuring high-efficiency electric power transmission over varying distances by maintaining phase matching between the resonance current and driving voltage
Data Source
AI summary
An automatic tuning assist circuit is coupled with a transmission antenna. Multiple switches SW and a first auxiliary capacitor CA are arranged between a first terminal and a second terminal of the automatic tuning assist circuit. A first control unit is configured to switch on and off the multiple switches SW in synchronization with a driving voltage VDRV. A power supply is configured to apply the driving voltage VDRV across a series circuit that comprises the transmission antenna and the automatic tuning assist circuit.