Wireless Charging Coil Cooling via Air-Spray Diffusion
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Solution Overview
Problem
Existing wireless power supply systems face challenges in efficiently cooling coils during wireless power transfer, particularly when the power receiving and transmitting devices are in a relatively movable relationship, leading to reduced heat transfer efficiency and increased vehicle size due to cooling device requirements.
Innovation Solution
A cooling device that sprays a coolant towards the coils using a coolant jetting member with adjustable inclination and electromagnetic valves, allowing for efficient cooling without the need for precise positioning, using non-magnetic and non-electroconductive materials to avoid interference with the electromagnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If contact heat transfer is used between power receiving device and power transmitting device, then heat transfer efficiency is improved, but positioning accuracy requirements increase and time consumption increases
Solution Approach 1:
The patent introduces air as an intermediary medium for heat transfer. Instead of requiring direct contact between the power receiving device and power transmitting device, the cooling device sprays coolant into the air surrounding the coil, and the air flow carries the cooled air back to cool the coil continuously. This intermediary air flow mechanism enables heat transfer without strict positioning requirements.
Solution Approach 2:
The patent employs pneumatic principles by utilizing air flow and coolant spray to achieve cooling. The cooling device sprays coolant into the air, creates a cooling air flow, and uses this pneumatic medium to continuously remove heat from the coil, replacing the need for contact-based heat transfer.
2Temperature
If vehicle-mounted fan cooling is used, then cooling capability is improved, but vehicle size increases
Solution Approach 1:
The patent extracts the cooling function from the vehicle body and relocates it to a separate cooling device positioned near the power receiving device. By spraying coolant into the air surrounding the coil and using air flow for heat dissipation, the system eliminates the need for large vehicle-mounted fans and associated cooling infrastructure within the vehicle.
Solution Approach 2:
The system utilizes the surrounding air environment and natural convection currents to achieve cooling. The cooling device sprays coolant and creates air flow that automatically circulates and dissipates heat without requiring large vehicle-mounted fans or complex vehicle-integrated cooling systems.
3Loss of energy
If precise positioning is required for heat transfer, then heat transfer efficiency is improved, but positioning time increases
Solution Approach 1:
The patent transitions from a contact-based zero-dimensional heat transfer interface to a three-dimensional air flow-based heat transfer volume. By spraying coolant into the air surrounding the coil and utilizing air convection currents, the system creates a volumetric cooling zone that is tolerant of positional variations, eliminating the need for precise positioning.
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 achieves high cooling capacity and efficiency by diffusing coolant in the air, allowing for positional deviations between the power receiving and transmitting devices, thereby eliminating the need for time-consuming positioning and maintaining power efficiency during wireless power supply.
Implementation Method 1
spraying a coolant toward the coil... diffusing coolant in the air
Implementation Method 2
diffusing coolant in the air... achieving high cooling capacity and efficiency
Implementation Method 3
electromagnetic valve configured to open and close a flow path of the coolant flow line
Implementation Method 4
perform wireless power supply using a coil... the coil or the like exchanging the high frequency power generates heat
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A cooling device (30) of the present invention is attached to a park station (20) where wireless power supply is performed to a vehicle (10) using a coil (21a) and cools a coil (11a) provided on the vehicle (10) by spraying a coolant.