Transmit Resonator Metal Plate for EMI Shielding and Cooling
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Solution Overview
Problem
Existing wireless power transfer systems for ventricular assist devices (VADs) face challenges in reducing far-field electromagnetic emissions and improving cooling efficiency, particularly from the transmit resonator, which can interfere with other devices and cause temperature hotspots.
Innovation Solution
The implementation of a transmit resonator with a core, coil element, and a housing that includes a metal plate positioned opposite the receive resonator, along with a thermally conductive housing, to reduce far-field electromagnetic emissions and enhance cooling by using a metal plate to cancel out magnetic fields and facilitate heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmit resonator is used to transfer wireless power, then power transfer function is achieved, but far-field electromagnetic emissions increase causing interference with other devices
Solution Approach 1:
A metal plate is introduced as an intermediary element between the transmit resonator and the external environment. This plate acts as a shield that intercepts and redirects electromagnetic fields, preventing far-field emissions while allowing the wireless power transfer function to operate effectively through the skin-coupled receive resonator
2Productivity
If the transmit resonator operates at high power, then wireless power transfer efficiency is improved, but temperature of the resonator increases causing thermal issues
Solution Approach 1:
The metal plate serves as a thermal intermediary that conducts heat away from the transmit resonator. By positioning the plate in thermal contact with the resonator, it creates an additional heat dissipation pathway, reducing the temperature rise that would otherwise occur during high-power operation
Solution Approach 2:
The introduction of the metal plate changes the thermal parameters of the system by adding a high-thermal-conductivity pathway. This modifies the heat distribution pattern, spreading thermal energy over a larger area and reducing peak temperatures at critical points
3Object-generated harmful factors
If shielding structures are added to reduce electromagnetic emissions, then EM interference is reduced, but device complexity and size increase
Solution Approach 1:
The metal plate is designed to perform multiple functions simultaneously: it acts as an electromagnetic shield to reduce far-field emissions, serves as a thermal management component to dissipate heat, and integrates with the existing housing structure. This multi-functionality reduces the need for separate shielding components, thereby limiting the increase in device complexity
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 design effectively reduces far-field electromagnetic emissions by up to 43% and achieves more uniform temperature distribution, improving the overall cooling efficiency of the wireless power transfer system.
Implementation Method 1
the metal plate facilitates reducing far-field electromagnetic emissions and improving cooling of the wireless power transfer system
Implementation Method 2
the metal plate positioned on a side of the transmit resonator that is opposite a receive resonator during operation of the wireless power transfer system, and wherein the metal plate facilitates reducing far-field electromagnetic emissions and improving cooling
Implementation Method 3
the housing made of a thermally conductive material to facilitate improving thermal performance of the wireless power transfer system
Data Source
AI summary
A transmit resonator for use in a wireless power transfer system is provided. The transmit resonator includes a core defining an annular groove, a coil element disposed within the annular groove, and a housing surrounding the core and the coil element. The housing includes a casing. and a metal plate, wherein the metal plate is positioned on a side of the transmit resonator that is opposite a receive resonator during operation of the wireless power transfer system, and wherein the metal plate facilitates reducing far-field electromagnetic emissions and improving cooling of the wireless power transfer system.