Coupled Inductor Wireless Power Transfer via Sine Wave Resonance
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Solution Overview
Problem
Existing coupled inductor systems for wireless power and data transfer face inefficiencies in energy transfer, leading to excess heat and limited maximum power transfer capability due to the use of square waves, which result in wasted energy and radiated emissions at harmonic frequencies.
Innovation Solution
The system employs a primary side coil driven by a sine wave generator with adjustable frequency and amplitude, using Class D or Class G amplifiers to minimize frequency bandwidth and optimize power transfer, along with feedback mechanisms to determine the resonant frequency for efficient energy transfer and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If square waves are used to drive the primary coil, then power transfer can be achieved, but energy efficiency deteriorates due to wasted energy at harmonic frequencies
Solution Approach 1:
The patent changes the waveform parameter from square wave to sine wave to eliminate harmonic frequencies. The sine wave generator produces a pure sinusoidal output that resonates with the secondary coil's resonant frequency, avoiding the generation of harmful harmonic emissions and improving energy efficiency by transferring power only at the fundamental frequency.
Solution Approach 2:
The patent employs periodic sinusoidal action at the resonant frequency of the secondary coil. By driving the primary coil with a sine wave at the same frequency as the secondary coil's resonance, the system achieves efficient energy transfer through resonant coupling, minimizing energy loss and avoiding harmonic distortion.
2Adaptability or versatility
If the system operates at fixed frequency, then circuit design is simplified, but adaptability deteriorates when load conditions change
Solution Approach 1:
The patent implements feedback mechanisms that monitor the secondary coil's resonant frequency and adjust the primary coil's driving frequency accordingly. This feedback loop ensures the system maintains optimal resonant coupling conditions even when load conditions change, improving adaptability while managing complexity through automated frequency tracking.
Solution Approach 2:
The patent employs dynamic frequency adjustment where the operating frequency is not fixed but varies to track the resonant frequency of the secondary coil under different load conditions. This dynamic adaptation allows the system to maintain maximum efficiency across varying operational scenarios.
3Power
If high power is transferred wirelessly, then power delivery capability is improved, but heat generation increases reducing system reliability
Solution Approach 1:
The patent utilizes resonant oscillation at the natural frequency of the secondary coil to achieve efficient power transfer. By matching the driving frequency to the resonant frequency, the system achieves maximum power transfer with minimal energy loss, thereby reducing heat generation even at high power levels.
Solution Approach 2:
The patent exploits the phase relationship between the primary and secondary coils at resonant frequency to achieve efficient energy transfer. When the coils are tuned to the same resonant frequency, the phase difference minimizes reactive power and maximizes real power transfer, reducing wasted energy and heat generation.
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 approach enhances power transfer efficiency, reduces waste and emissions, and allows for precise control of voltage amplitude, enabling improved manufacturability and lower costs while supporting data transmission capabilities.
Implementation Method 1
A variable current on a primary coil is used to create a varying magnetic field, and thus a voltage, in a secondary coil
Implementation Method 2
Inductive coupling is an effect used to transfer electrical energy from one circuit to an adjacent circuit through inductive coils
Data Source
AI summary
Coupled inductor systems are disclosed in which transmitter and receiver inductors, or coils, are coupled in a configuration for wirelessly transferring power and/or data among them. In preferred implementations, the systems are used for transmitting both power and data in pairs of coupled coils. Primary side circuits in preferred embodiments of the systems of the invention employ Class D or Class G amplifiers.