Feed Unit Frequency Control for Magnetic Resonance Efficiency
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Solution Overview
Problem
Non-contact feed systems face challenges in enhancing transmission efficiency during electric power transmission using a magnetic field, particularly due to variations in element characteristics and load variations affecting circuit current.
Innovation Solution
A feed unit and system incorporating a power transmission coil, parallel LC resonance circuit, series LC resonance circuit, and an alternating-current signal generating section, with a control section performing frequency control on the AC signal to minimize circuit current, utilizing a predetermined control signal to optimize power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-contact power supply is performed using electromagnetic induction or magnetic resonance, then terminal connection becomes unnecessary and charging is simplified, but transmission efficiency deteriorates due to large circuit current flowing during power transmission
Solution Approach 1:
The patent applies resonance phenomenon to the LC resonance circuit, causing the circuit to oscillate at its natural resonant frequency. This resonance effect enables efficient power transmission through magnetic coupling between coils while maintaining low circuit current, thereby improving transmission efficiency without requiring terminal connection
Solution Approach 2:
The patent changes the operating parameters by introducing an LC resonance circuit that operates at a specific resonant frequency. By tuning the resonance frequency and controlling the AC signal frequency to match this resonance point, the system achieves optimal power transmission with minimized circuit current, resolving the efficiency problem
2Adaptability or versatility
If frequency characteristics are allowed to vary according to element characteristics and load variations, then the system adapts to different conditions, but circuit current increases and transmission efficiency deteriorates
Solution Approach 1:
The control section monitors the operating conditions and adjusts the AC signal frequency in real-time to maintain resonance at the optimal point. This feedback mechanism ensures that despite variations in element characteristics or load, the system operates at maximum efficiency with minimized circuit current by continuously adapting the frequency to match the resonant frequency of the LC circuit
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
The solution effectively suppresses circuit current to a low level, enhancing transmission efficiency and addressing variations in element characteristics and load, thereby improving power transmission performance.
Implementation Method 1
a power transmission coil provided to perform power transmission with use of a magnetic field
Implementation Method 2
a non-contact feed system using a method called a magnetic resonance method utilizing an electromagnetic resonance phenomenon
Data Source
AI summary
A feed unit includes: a power transmission coil provided to perform power transmission with use of a magnetic field; a parallel LC resonance circuit including the power transmission coil; a series LC resonance circuit; an alternating-current signal generating section supplying the parallel LC resonance circuit and the series LC resonance circuit with an alternating-current signal used to perform the power transmission; and a control section controlling the alternating-current signal generating section with use of a predetermined control signal, the control section performing frequency control of the control signal to allow a circuit current that flows upon the power transmission to become smaller.