Composite Resonant Circuit for Wireless Power Efficiency
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Solution Overview
Problem
Existing power transmission systems using electric-field coupling methods face inefficiencies when the position of the power receiving apparatus is not fixed within a certain area, making it difficult to maintain sufficient power transmission efficiency.
Innovation Solution
A power transmission system is designed with a power transmitting apparatus and a power receiving apparatus that form a composite resonant circuit through compound capacitance, where the impedances of the configuration components are set to ensure a resonant frequency that minimizes impedance when the load circuit is short-circuited and maximizes power transmission efficiency, even when the position of the power receiving apparatus changes within a predetermined area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a power transmission system uses electric-field coupling method with fixed resonant frequency matching, then power transmission efficiency is improved at a specific position, but power transmission efficiency deteriorates when the power receiving apparatus moves to different positions within a region
Solution Approach 1:
The patent applies dynamics by making the resonant frequency adjustable rather than fixed. The signal generator can dynamically change the frequency of the AC signal applied to the power transmitting electrodes, allowing the system to adapt to different positions of the power receiving apparatus. This resolves the contradiction by enabling the system to maintain high power transmission efficiency across multiple positions through frequency tuning.
Solution Approach 2:
The patent employs parameter changes by modifying the resonant frequency parameter of the power transmission system. When the power receiving apparatus moves to different positions, the system changes the frequency parameter to re-establish resonant coupling, thereby maintaining efficient power transmission. This directly addresses the contradiction between fixed-frequency efficiency and position adaptability.
2Loss of energy
If the impedance of the composite resonant circuit is set for minimum impedance at short-circuit condition, then power transmission efficiency is improved, but frequency stability deteriorates when load conditions vary
Solution Approach 1:
The patent applies feedback by monitoring the actual resonant frequency and impedance conditions of the composite resonant circuit, then using this information to adjust the signal generator's output frequency. This closed-loop control ensures that the system maintains both high power transmission efficiency and frequency stability even when load conditions vary, as the feedback mechanism continuously optimizes the operating parameters.
Solution Approach 2:
The patent uses dynamics by implementing a dynamic impedance matching mechanism that adjusts circuit parameters in real-time based on operating conditions. This allows the system to maintain optimal power transmission efficiency across varying load conditions while preserving frequency stability through adaptive parameter adjustment.
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 configuration secures high power transmission efficiency and reduces frequency deviation, ensuring consistent power delivery across varying positions of the power receiving apparatus within the specified area.
Implementation Method 1
the power transmitting side inductor and a capacitor formed between the power transmitting electrodes form a series resonant circuit
Implementation Method 2
the inductor and the capacitor formed between the power receiving electrodes form a parallel resonant circuit
Implementation Method 3
a composite resonant circuit including the series resonant circuit and the parallel resonant circuit is formed through compound capacitance formed between the power transmitting electrodes and the power receiving electrodes
Data Source
AI summary
When power transmitting electrodes of a power transmitting apparatus are respectively facing power receiving electrodes of a power receiving apparatus, a composite resonant circuit including a series resonant circuit and a parallel resonant circuit is formed through a compound capacitance formed between the power transmitting electrodes and the power receiving electrodes. In a predetermined mutually facing state in which the compound capacitance becomes maximum, the impedances of the configuration components of the composite resonant circuit are set such that a resonant frequency at which the impedance of the composite resonant circuit from a signal generator side when inputs of a load circuit is short-circuited becomes locally minimum, becomes higher than a resonant frequency at which the impedance of the composite resonant circuit as seen from the signal generator side when the inputs of the load circuit are open becomes locally maximum.