Integrated LC Resonator Panels for Wireless Power EMI Shielding
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Solution Overview
Problem
Existing wireless power transfer devices with resonant topologies face challenges in dissipating heat and reducing electromagnetic interference (EMI) due to the arrangement of capacitors and inductors, which tend to increase EMI rather than minimize it, especially in high power applications involving high voltages.
Innovation Solution
A wireless power transfer device is designed with an inductor panel and a capacitor panel in a compact, integrated package, where the capacitor panel includes a first conductive plate acting as an electromagnetic shield and a dielectric layer, and the inductor panel features a conductive coil with a magnetic core, reducing radiation and heat dissipation through a resin coil support and electrically isolating layers, and an electrically conductive connection within a window through the magnetic core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a resonant topology with capacitor and inductor is used for wireless power transfer, then power transfer efficiency is improved, but electromagnetic interference increases
Solution Approach 1:
The device is divided into separate inductor panel and capacitor panel assemblies, each optimized for its specific function. The inductor panel generates the magnetic field for wireless power transfer while the capacitor panel provides resonant tuning and EMI shielding, allowing independent optimization of each component to reduce overall EMI while maintaining efficiency
Solution Approach 2:
A conductive shield is introduced as an intermediary element between the inductor and capacitor panels. This shield acts as a barrier that blocks electromagnetic interference from radiating outward while allowing the magnetic field to couple between the primary and secondary coils for power transfer, thus maintaining efficiency while reducing EMI
2Power
If high voltage is used for high power wireless transfer, then power transfer capability is improved, but heat dissipation requirements increase
Solution Approach 1:
The capacitor panel is integrated directly with the inductor panel in a compact assembly where the capacitor plates are positioned adjacent to the inductor windings. This merging of components allows for efficient heat dissipation through the capacitor structure and reduces the thermal path length, enabling high power operation without excessive heat accumulation
Solution Approach 2:
The resonant frequency and impedance parameters of the LC circuit are optimized to operate at high voltage while maintaining controlled current levels. By adjusting the capacitance and inductance values, the system achieves high power transfer capability through voltage rather than current, thereby reducing I²R losses and heat generation
3Object-generated harmful factors
If electromagnetic shielding is added to reduce EMI, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The capacitor panel serves multiple functions simultaneously: it provides resonant tuning for the wireless power transfer circuit, acts as an electromagnetic shield to block EMI, and serves as a structural support for the entire assembly. This multi-functionality reduces the need for separate EMI shielding components, thereby maintaining simplicity while achieving EMI reduction
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 effectively reduces electromagnetic noise and dissipates heat, enabling efficient high power wireless transfer of up to 10 kilowatts at 400 volts while maintaining a compact design, minimizing EMI and maintaining the resonant frequency of the LC series resonator.
Implementation Method 1
Wireless power transfer devices typically rely on an inductive linkage between two inductors to transfer energy from a primary side to a secondary side
Implementation Method 2
The inductor and capacitor form a LC series resonator
Implementation Method 3
the first conductive plate is configured as an electromagnetic shield that reduces radiation of a magnetic field of the inductor panel
Data Source
AI summary
An illustrative example embodiment of a wireless power transfer device includes an inductor panel and a capacitor panel adjacent the inductor panel. The capacitor panel includes a first conductive plate adjacent one side of the inductor panel, a dielectric layer adjacent the first conductive plate, and a second conductive plate adjacent the dielectric layer on an opposite side of the dielectric layer from the first conductive plate.