Wireless Power Receiver Automatic Tuning Assist Circuit
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in automatically tuning resonance frequencies for efficient power transfer over long ranges, as these frequencies fluctuate and are difficult to adjust on the receiving end without affecting phase conditions.
Innovation Solution
A wireless power transmission apparatus and receiving apparatus equipped with multiple channels of transmission and reception antennas, each coupled with an automatic tuning assist circuit that includes switches and auxiliary capacitors, allowing for automatic frequency tuning by adjusting the phase difference between the driving voltage and resonance current, thereby achieving a quasi-resonant state without altering the capacitance of resonance capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If electromagnetic wave reception method is used for long-range power transmission, then transmission distance is improved, but power use efficiency deteriorates
Solution Approach 1:
The patent changes the operating parameters by using magnetic field resonance at specific frequencies (e.g., 6.78 MHz for industrial, scientific, and medical applications) to achieve a balance between transmission distance and power efficiency. By tuning the resonance frequency of both transmitting and receiving coils to match, the system achieves efficient energy transfer over distances significantly greater than traditional electromagnetic induction while maintaining much higher efficiency than conventional electromagnetic wave reception methods.
2Loss of energy
If resonance frequency is adjusted manually, then power transmission efficiency is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service through automatic frequency tuning circuits that continuously monitor and adjust the resonance frequency of both transmitting and receiving coils. The system automatically detects the optimal frequency and adjusts capacitive elements or inductive elements to maintain resonance, eliminating the need for manual intervention while ensuring maximum power transmission efficiency is maintained throughout operation.
Solution Approach 2:
The patent employs feedback mechanisms where the receiving coil detects the transmitted magnetic field strength and phase information, sends this information back to the transmitting coil, which then automatically adjusts its resonance frequency. This closed-loop feedback system ensures continuous optimization of power transfer efficiency without requiring manual frequency adjustment by operators.
3Adaptability or versatility
If resonance frequency fluctuates, then adaptability to environmental changes is improved, but stability of power transmission deteriorates
Solution Approach 1:
The patent implements dynamic frequency tracking where the resonance frequency of both transmitting and receiving coils is continuously adjusted in real-time to match environmental changes. The system dynamically modifies capacitive or inductive parameters to maintain resonance conditions despite fluctuations in temperature, load, or surrounding electromagnetic environment, thereby maintaining stable power transmission while adapting to changing 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 high-efficiency wireless power transmission by automatically tuning resonance frequencies, maintaining a quasi-resonant state and reducing the voltage applied to circuit components, which lowers costs and enhances design flexibility, while allowing for precise and flexible operation across multiple channels.
Implementation Method 1
The electromagnetic induction method is employed to supply electric power at a short range
Implementation Method 2
The resonance frequency of the transmitter side LC resonance circuit is represented by fTX=1/(2π√(LTX·CTX))
Implementation Method 3
a reception coil (LRX), a resonance capacitor (CRX), and a load (70)
Data Source
AI summary
An automatic tuning assist circuit is coupled in series with a transmission antenna. A first switch and a second switch are arranged in series between a first terminal and a second terminal of the automatic tuning assist circuit. Furthermore, a third switch and a fourth switch are arranged in series between the first terminal and the second terminal. A first auxiliary capacitor is arranged between a connection node that connects the first switch and the second switch and a connection node that connects the third switch and the fourth switch. A control unit switches the first switch through the fourth switch with the same frequency as that of the driving voltage, and with a predetermined phase difference with respect to the driving voltage.