Inverter Transformer Ferrite Shielding for Magnetic Leakage
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Solution Overview
Problem
As image display devices increase in size, energy leakage from transformers due to magnetic fields becomes a significant issue, particularly when cases are made from Iron or materials containing Iron, leading to inefficiencies and heat generation.
Innovation Solution
Incorporating a blocking member, such as ferrite, on or under the transformer to prevent energy leakage, which can be selectively formed based on leakage patterns, and using a case made from Iron or its alloys to reduce manufacturing costs while minimizing energy loss and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the capacity of the transformer is increased to handle larger image display devices, then the power handling capability is improved, but energy leakage to the exterior increases due to stronger magnetic fields
Solution Approach 1:
A blocking member made of ferrite or magnetic shielding material is introduced as an intermediary between the transformer and the case. This blocking member intercepts and redirects magnetic flux lines, preventing them from reaching the case and causing energy leakage. The blocking member acts as a mediator that manages the magnetic field without requiring changes to the transformer itself.
2Ease of manufacture
If the case is manufactured using Iron or materials containing Iron to reduce manufacturing costs, then the ease of manufacture is improved, but energy leakage from the transformer increases due to magnetic field interaction with the Iron case
Solution Approach 1:
The case structure is segmented by introducing a blocking member as a separate component between the transformer and the Iron case. This segmentation allows the case to maintain its Iron construction for cost-effectiveness while the blocking member provides magnetic shielding. The problem is divided into two functional parts: the structural case and the magnetic shielding layer.
Solution Approach 2:
The blocking member serves as an intermediary layer between the transformer and the Iron case. It prevents direct interaction between the magnetic field and the Iron case, allowing the case to be made of inexpensive Iron while avoiding energy leakage issues.
3Loss of energy
If the blocking member is extended to cover the entire surface of the transformer, then the energy leakage prevention is improved, but the device complexity increases
Solution Approach 1:
Instead of uniformly covering the entire transformer surface, the blocking member is strategically positioned only at specific locations where magnetic flux leakage is most prominent. This local approach provides effective shielding while minimizing the amount of material used and reducing structural complexity.
Solution Approach 2:
The blocking member covers only the critical portions of the transformer where magnetic leakage occurs, rather than providing complete surface coverage. This partial action is sufficient to achieve the desired energy leakage prevention while avoiding unnecessary complexity.
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 solution effectively inhibits energy leakage and heat generation in the case and support structures, enhancing the efficiency of the inverter, backlight assembly, and image display devices by utilizing ferrite blocking members to manage magnetic field-induced energy loss.
Implementation Method 1
a blocking member on at least a portion of one side of the transformer... blocking member formed on the transformer, so that energy may be prevented from being leaked from the transformer to an exterior
Implementation Method 2
The blocking member can include ferrite... when the blocking member is formed using ferrite, the blocking member can efficiently prevent energy from being leaked from the transformer
Data Source
AI summary
A DC/AC inverter for a backlight can include a support, a printed circuit board (PCB) on the support, a transformer on the PCB, and a blocking member formed on at least a portion of at least one side of the transformer. The blocking member can be formed of a ferrite material.