Bimodal Resonant Wireless Power Transfer for Flexible Alignment
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Solution Overview
Problem
Existing wireless power transfer technologies face challenges such as high cost, reliance on large compensation networks, inefficiency, and rigid alignment and spacing requirements, particularly in inductive and capacitive power transfer systems, which are not optimized for consumer products like automotive wire harnesses and solar energy systems.
Innovation Solution
A bimodal near-field resonant wireless power transfer system that allows for simultaneous capacitive and inductive power transfer with adjustable mode ratios, using a transmitter subsystem with a tuner module and receiver subsystem to adjust phase differences and frequencies, and a multi-transmitter system with decoupled resonators for flexible power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If inductive power transfer is used with close coil spacing, then power transfer efficiency is improved, but alignment requirements become rigid and system adaptability deteriorates
Solution Approach 1:
The patent employs resonant inductive coupling with dynamically adjustable resonant frequencies on both transmitter and receiver sides. This allows the system to maintain high efficiency over varying distances and misalignments by tuning the resonant frequencies to match, transforming a static coupling problem into a dynamically adjustable system that adapts to changing spatial relationships between coils
Solution Approach 2:
The system changes key parameters including resonant frequency, operating frequency, and coupling coefficient to optimize performance. By adjusting these parameters, the system can maintain efficient power transfer across a range of distances and alignments, effectively resolving the contradiction between efficiency and adaptability
2Loss of energy
If resonant circuits are used in inductive coupling, then power transfer efficiency at greater distances is improved, but system complexity increases
Solution Approach 1:
The resonant circuits serve multiple functions: they enable efficient power transfer at greater distances, provide frequency selectivity to reduce interference, and allow for adjustable operating parameters. This multi-functionality justifies the added complexity by delivering superior performance across multiple dimensions
3Loss of energy
If ferrite plates are used for shielding, then eddy-current losses are reduced, but system cost increases
Solution Approach 1:
The patent replaces physical ferrite shielding plates with an electromagnetic field-based solution using resonant inductive coupling. The resonant circuits inherently suppress eddy currents through their tuned operation, eliminating the need for additional ferrite components while maintaining energy efficiency
4Ease of operation
If large capacitors and inductors are used in compensation networks, then power transfer is enabled, but parasitic resistance increases and efficiency decreases
Solution Approach 1:
The system uses adjustable resonant frequencies and coupling parameters to optimize the performance of compensation networks. By operating at resonant frequencies, the system minimizes the impact of parasitic resistance, allowing large capacitors and inductors to function effectively without excessive energy loss
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 system enhances power transfer efficiency, reduces component count, and offers flexible alignment and spacing, addressing the limitations of existing technologies by optimizing power transfer for consumer products like vehicles and solar energy systems.
Implementation Method 1
In inductive power transfer (IPT), power is typically transferred between coils of wire by a magnetic field. An alternating current (AC) is driven through a transmitter coil to create an oscillating magnetic field. The magnetic field passes through a receiving coil where it induces an alternating current in the receiving coil.
Implementation Method 2
In resonant inductive coupling, power is transferred by magnetic fields between two resonant circuits, one in the transmitter and one in the receiver. The two circuits are tuned to resonate at the same resonant frequency.
Implementation Method 3
In some IPT systems, magnetic fields can produce eddy-currents in nearby metals. This can cause significant temperature rise and fire hazard.
Implementation Method 4
Capacitive power transfer (CPT), makes use of electric fields for the transmission of power between two electrodes, such as metal plates. An alternating voltage is applied by the transmitter to the transmitting plate. The oscillating electric field induces an alternating potential on the receiver plate, which causes an alternating current to flow in the load circuit.
Data Source
AI summary
A system for transferring power from a power source to a receiver.