Decoupled Platen Power Transfer With Bimodal Resonant Coupling
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Solution Overview
Problem
Current wireless power transfer systems face challenges such as high costs, reliance on expensive compensation networks, inefficiencies due to parasitic resistance, and rigid alignment and spacing requirements, particularly in automotive and consumer electronics applications, where there is a need for flexible and efficient power transfer solutions.
Innovation Solution
A bimodal near-field resonant wireless electrical power transfer system that simultaneously enables capacitive and inductive power transfer with an adjustable transfer mode ratio, using a transmitter subsystem with decoupled transmitter resonators and modules, and a receiver subsystem capable of receiving power at varying frequencies, allowing for flexible alignment and spacing, and reducing the need for large compensation components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If resonant inductive coupling is used to increase efficiency at greater distances, then power transfer efficiency is improved, but the system requires expensive ferrite plates for shielding which increases cost
Solution Approach 1:
The system divides the power transfer function into two separate resonators (transmitter and receiver) that operate independently at the same frequency, eliminating the need for ferrite shielding plates while maintaining efficient power transfer over greater distances
Solution Approach 2:
The patent replaces the mechanical ferrite plate shielding system with an electrical resonance-based solution where two tuned circuits transfer power through magnetic coupling without requiring physical shielding materials
2Length of moving object
If large capacitors and inductors are used in compensation networks to achieve minimal separation, then power transfer is enabled, but parasitic resistance dramatically reduces system efficiency
Solution Approach 1:
The patent changes the operating parameters by using resonant frequency tuning of both transmitter and receiver circuits, allowing efficient power transfer at greater separations without relying on large compensation components that introduce parasitic losses
3Loss of energy
If transmitter and receiver coils are placed very close together with aligned axes to achieve high efficiency, then power transfer efficiency is improved, but the system requires rigid alignment and spacing which reduces flexibility
Solution Approach 1:
The system uses dynamically tuned resonant circuits that can maintain efficient power transfer over a range of distances and alignments, providing flexibility in positioning while maintaining high efficiency without requiring precise rigid alignment
4Power
If high voltages are applied to capacitor plates in CPT systems to transfer power, then power transfer capability is improved, but strong electric fields cause significant field emission to the surrounding area
Solution Approach 1:
The patent substitutes capacitive power transfer with inductive resonant power transfer, using magnetic field coupling between two resonant circuits instead of electric field coupling between capacitor plates, thereby avoiding the field emission problem associated with high voltages
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 solution enhances power transfer efficiency, reduces costs by minimizing component usage, and offers greater flexibility in alignment and spacing, making it suitable for applications like electric vehicles and consumer electronics.
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.
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
The magnetic field passes through a receiving coil where it induces an alternating current in the receiving coil.
Implementation Method 4
Ferrite plates may be used to provide shielding and improve inductive coupling
Implementation Method 5
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
The present invention involves systems and methods of bimodal near-field wireless power transfer for simultaneous capacitive and inductive power transfer by adjustable transfer mode ratio of capacitive to inductive power transfer at a variable power signal oscillation frequency, wherein transmitter pairs are electrically decoupled from one another. The method involves providing a transmission surface of transmitter resonators; monitoring input impedance of each transmitter resonator; calibrating baseline input impedance for the transmitter resonators; and either assigning an off state when input impedance is less than baseline impedance; or assigning an active state to the transmitter resonator when input impedance is greater. A further aspect involves near-field resonant wireless electrical power transfer system having software that measures input impedance of corresponding transmitter resonators and a test signal power draws; and selects a frequency from a lookup table based on the input impedance of the corresponding transmitter resonator and the test signal power draw.