Parallel Resonant Coil Layout for High-Power Wireless Transfer
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in efficiently transmitting and receiving large amounts of power without increasing the voltage of the direct-current power supply, power transmission resonance current, or the size of components, leading to issues such as increased voltage stress, power loss, and heat generation.
Innovation Solution
A wireless power transfer system with a power transmission circuit that includes multiple power transmission resonance mechanisms connected in parallel, using a direct-current power supply and a switching circuit to intermittently supply power, forming electromagnetic resonance coupling with a power reception resonance mechanism to achieve power transfer without increasing direct-current voltage or resonance current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power supply voltage is increased to increase reception power, then the reception power increases, but the voltage stress increases in power semiconductor devices, causing increased device size, power loss, and reduced reliability
Solution Approach 1:
The patent divides the power transmission system into multiple independent transmission coils (first transmission coil and second transmission coil) that operate in parallel. Each coil receives power from the same DC power supply without requiring increased voltage, and together they provide the necessary total power transmission capability. This segmentation allows the system to achieve high reception power while maintaining safe voltage levels for power semiconductor devices.
2Power
If the power transmission resonance current is increased to increase reception power, then the reception power increases, but heat generated by the power transmission coil increases, requiring increased conductor width or thickness
Solution Approach 1:
The patent segments the power transmission function across multiple coils operating in parallel. Each transmission coil carries a portion of the total current rather than requiring a single coil to handle the full current load. This current distribution reduces the current density and heat generation in each individual coil, eliminating the need to increase conductor width or thickness while still achieving the required total power transmission.
3Power
If the power transmission resonance current is increased to increase reception power, then the reception power increases, but the voltage applied to power transmission coil and resonant capacitor increases, causing increased power loss and heat generation
Solution Approach 1:
The patent employs multiple transmission coils and resonant capacitors connected in parallel, where each component handles a fraction of the total power. This segmentation allows the system to achieve high power transmission without requiring high voltage or high current in individual components, thereby reducing power losses (I²R losses) and heat generation in each resonant circuit element while maintaining efficient overall power transfer.
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 enables efficient power transfer with a simple configuration, preventing increases in component size, voltage stress, and heat generation, while allowing for a wide range of reception power based on positional changes and electromagnetic resonance coupling.
Implementation Method 1
a power reception coil that magnetically couples to the power transmission coil
Implementation Method 2
The plurality of power transmission resonance mechanisms and the power reception resonance mechanism form electromagnetic resonance coupling
Data Source
AI summary
A wireless power transfer system includes a power transmission circuit that includes power transmission resonance mechanisms including power transmission coils and power transmission resonant capacitors, and a power reception circuit that includes a power reception resonance mechanism including a power reception coil that magnetically couples to the power transmission coils and a power reception resonant capacitor. The power transmission circuit includes a square wave power supply circuit including a direct-current power supply and a switching circuit, the power transmission resonance mechanisms and the power reception resonance mechanism form electromagnetic resonance coupling, and the power reception resonance mechanism acquires reception power by superposing resonance currents induced by the electromagnetic resonance coupling.