Wireless Power Transfer Layout With Distributed DC/AC Converters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the number of power transmission units increases in a wireless power transfer system, the difference in wire lengths between the power transmission units closer and farther from the high-frequency power source increases, leading to variations in parasitic components and power transfer efficiency.
Innovation Solution
A wireless power transfer apparatus is configured with a DC power supply unit and multiple DC/AC converters, where the rated power of the DC power supply is greater than that of the DC/AC converters, allowing for a shared wiring arrangement region between DC and AC wirings to minimize the distance between converters and power transmission devices, reducing variations in power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of power transmission units is increased, then the power supply capacity is improved, but the difference in wire lengths between units closer and farther from the power source increases, leading to greater variation in parasitic components and power transfer efficiency
Solution Approach 1:
The system segments the power distribution into two distinct wiring paths: DC wiring for connecting power transmission units to the power source, and AC wiring for connecting power reception units to the transmission units. This segmentation allows each wiring type to be optimized independently, with DC wiring designed for low parasitic inductance and AC wiring designed for short length, thereby resolving the efficiency variation problem when scaling the number of units
Solution Approach 2:
The patent introduces DC/AC converters as intermediary devices that convert DC power from the power source to AC power for transmission to reception units. These converters act as mediators that decouple the DC power distribution from AC power transmission, allowing optimal wiring designs for each stage and eliminating the parasitic component variations that would occur in a direct AC distribution system
2Device complexity
If all power transmission devices are connected to a single DC/AC converter through AC wirings, then the device complexity is reduced, but the AC wiring length increases, leading to greater power losses and reduced efficiency
Solution Approach 1:
The system segments the power distribution into two distinct wiring paths: DC wiring for connecting power transmission units to the power source, and AC wiring for connecting power reception units to the transmission units. This segmentation allows each wiring type to be optimized independently, with DC wiring designed for low parasitic inductance and AC wiring designed for short length, thereby resolving the efficiency variation problem when scaling the number of units
Solution Approach 2:
The patent applies local quality optimization by designing DC wiring with specific characteristics (low parasitic inductance) for the power source to transmission unit connections, and AC wiring with short length for the transmission unit to reception unit connections. Each wiring segment is optimized for its specific function and location in the power distribution chain, minimizing energy losses at each stage
Data Source
AI summary
A wireless power transfer system (10) for wireless power transfer to a power reception device (80) includes a DC power supply unit (20), at least one DC wiring (51) through which output power of the DC power supply unit is transferred, at least one DC/AC converter (30) connected to the at least one DC wiring, at least one AC wiring (52) through which output power of the at least one DC/AC converter is transferred, and at least one power transmission device (40) connected to the at least one AC wiring. A rated power of the DC power supply is greater than that of the at least one DC/AC converter.