Resonant Charging Circuit Harmonic Energy Extraction
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Solution Overview
Problem
Existing wireless charging systems for portable electrical devices are inefficient in converting alternating magnetic fields into electrical energy, even when the primary-side switch is operated at the resonant frequency of the secondary-side receiving circuit.
Innovation Solution
The use of at least two receiving coils on the secondary side, each forming a resonant circuit tuned to specific harmonics of the alternating magnetic field, with the first resonant circuit's frequency matching the primary-side switching frequency and the second resonant circuit's frequency being an integer multiple of the first, allowing for effective conversion of magnetic field energy into electrical energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single receiving coil is used on the secondary side, then the device complexity is low, but the energy transfer efficiency is insufficient
Solution Approach 1:
The receiving circuit is segmented into multiple resonant circuits (first resonant circuit with fundamental frequency, second resonant circuit with third harmonic frequency, third resonant circuit with fifth harmonic frequency) instead of using a single receiving coil. Each resonant circuit is tuned to a specific odd harmonic frequency of the alternating magnetic field, allowing simultaneous extraction of energy from multiple frequency components and significantly improving overall energy transfer efficiency.
Solution Approach 2:
The invention changes the resonant frequency parameters of the receiving circuits to match odd integer multiples (1st, 3rd, 5th harmonics) of the primary side switching frequency. By tuning the resonant circuits to these specific frequency parameters, the system can efficiently capture energy from the corresponding harmonic components of the alternating magnetic field, resolving the efficiency limitation of single-frequency reception.
2Loss of energy
If the primary-side switch is operated at the resonant frequency of the secondary-side receiving circuit, then the energy transfer is optimized, but a considerable part of the energy is still not converted into electrical energy
Solution Approach 1:
The invention utilizes the periodic nature of the alternating magnetic field generated by the primary-side switch, which contains multiple odd harmonic frequency components. By setting up multiple resonant circuits tuned to these different harmonic frequencies (1st, 3rd, 5th), the system periodically extracts energy from each frequency component as it passes through, converting what would otherwise be wasted magnetic field energy into usable electrical energy through rectification.
Solution Approach 2:
The invention converts the previously wasted harmonic energy components of the alternating magnetic field into useful electrical energy. The odd harmonic frequencies (3rd, 5th, etc.) that were not utilized by a single resonant circuit are now captured by additional resonant circuits tuned to these frequencies, transforming energy loss into energy gain and significantly improving overall conversion efficiency.
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 significantly improves the efficiency of energy transfer by utilizing the fundamental wave and odd integer multiples of the fundamental frequency, enhancing the conversion of magnetic field energy into electrical energy.
Implementation Method 1
a first receiving coil for receiving an alternating magnetic field which induces an electrical voltage in the first receiving coil
Implementation Method 2
a second receiving coil for receiving an alternating magnetic field, which induces an electrical voltage in the second receiving coil
Implementation Method 3
each forming a resonant circuit tuned to specific harmonics of the alternating magnetic field, with the resonant frequency of a first of the resonant circuits being tuned in particular to the switching frequency of the primary-side transmission circuit
Data Source
Figure 1~3
Figure 4
Figure 5
AI summary
The charging circuit (2) has resonance switching circuits having receipt coils to receive magnetic alternating fields. The electrical components are connected with terminals of the receipt coils to define a resonance frequency of resonance switching circuits. The resonance frequency of second resonance switching circuits is integral multiple of the resonance frequency of first resonance switching circuit. The receipt coils are arranged such that the receipt coils are penetrated by magnetic field lines of the magnetic alternating field during operation of charging circuit. Independent claims are included for the following: (1) method for loading energy store of portable electric appliance; and (2) method for manufacturing charging circuit.