Wireless Charging Shield with Varying Coil Seating Heights
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Solution Overview
Problem
Wireless chargers face challenges in effectively dissipating heat generated by the transmit coil, leading to user discomfort and operation degradation due to trapped heat, especially as output increases and charging speed improves.
Innovation Solution
A shield with a seating part for the transmit coil and a transfer part that extends to facilitate heat dissipation, featuring varying heights for the seating areas, air passages for airflow, and materials with high thermal conductivity, such as Mn—Zn or Ni—Zn ferrite, to enhance heat transfer and dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output of the wireless charger is increased to improve charging speed, then the charging efficiency is improved, but the heat generated in the transmit coil increases
Solution Approach 1:
The patent converts the harmful heat generated by the transmit coil into a beneficial effect by using it to heat and expand a plastic layer, which creates air passages that facilitate heat dissipation. The heat that would otherwise be wasted or harmful is transformed into a useful function for cooling the system.
Solution Approach 2:
The patent changes the physical state of the plastic layer from solid to expanded state through heating, which creates air passages. This parameter change (phase transition and volume expansion) enables the heat dissipation function while maintaining the shielding capability.
2Object-affected harmful factors
If a shielding plate is used to block electromagnetic waves, then electromagnetic interference is reduced, but heat dissipation is hindered
Solution Approach 1:
The patent creates a composite structure combining ferrite shielding material with plastic material containing air passages. This composite design maintains the electromagnetic shielding properties of ferrite while incorporating heat dissipation channels through the air passages in the plastic layer.
Solution Approach 2:
The patent introduces air passages (porous structure) into the shielding plate by expanding the plastic layer. These air passages enable heat dissipation while the surrounding ferrite material maintains electromagnetic shielding functionality.
3Device complexity
If heat is trapped inside the casing, then the structure is simple, but user discomfort and operation degradation occur
Solution Approach 1:
The patent enables the shielding plate to perform dual functions: electromagnetic shielding and heat dissipation. The air passages within the shielding plate structure allow heat to escape passively without requiring additional active cooling components, making the system self-regulating.
Solution Approach 2:
The shielding plate is designed to perform multiple functions simultaneously: blocking electromagnetic waves and dissipating heat. This multi-functionality reduces the need for separate cooling components while addressing heat-related comfort issues.
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 improved heat dissipation design raises the output of wireless chargers by effectively transferring and dissipating heat away from the charging area, reducing surface temperatures and maintaining charging efficiency.
Implementation Method 1
the heat generated in the transmit coil is transferred to the casing 25 through the shielding plate 22 and the heat dissipating plate 23
Implementation Method 2
a primary coil (transmit coil) is equipped in a charger (wireless power transmission device) and a secondary coil (receiving coil) is equipped in the electrical device of a charging target so that the current generated by a magnetic induction method between the primary coil and the secondary coil is converted into energy
Data Source
AI summary
The present disclosure relates to a shield for wireless charging that is capable of improving the effect of dissipating heat generated in a transmit coil, a method of manufacturing the same, and a wireless charger using the same. The shield for wireless charging according to an embodiment of the present disclosure includes a seating part on which the transmit coil is seated; and a transfer part extended integrally to a lower portion of the seating part to transfer heat generated in the transmit coil, wherein a plurality of transmit coils are seated on the seating part, and a height of a seating area on which each transmit coil is seated is set different from a height of a seating area adjacent to each other.