Transformer Shielding Plate for Display Power Modules
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Solution Overview
Problem
In thin display devices, the proximity of conductive back covers to transformers leads to capacitance formation, shifting resonant frequencies and causing switching losses, as well as increased power consumption and temperature due to magnetic flux leakage, resulting in transformer malfunctions.
Innovation Solution
A shielding plate is mounted on the circuit board in a non-contact manner to cover the transformer, made of a material with a lower resistance value than the back cover, positioned between the transformer and the conductive back cover to block electromagnetic interference, thereby preventing magnetic flux leakage and reducing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the transformer and back cover are moved closer to reduce display device thickness, then the thickness is reduced, but capacitance is formed between the transformer and back cover causing switching loss and resonant frequency shift
Solution Approach 1:
An insulating structure is introduced as an intermediary element between the transformer and the conductive back cover. This insulating structure prevents direct capacitive coupling while allowing the transformer to remain positioned close to the back cover, thus maintaining the reduced thickness while eliminating the switching loss caused by capacitance formation.
2Length of stationary object
If the transformer and back cover are moved closer to reduce display device thickness, then the thickness is reduced, but magnetic flux leaks to the back cover causing increased power consumption and temperature rise
Solution Approach 1:
The insulating structure serves as a mediator that blocks the path of magnetic flux between the transformer and the conductive back cover. By positioning this insulating structure between the two components, magnetic flux is prevented from leaking into the back cover, thereby reducing power consumption and heat generation in the back cover while maintaining close proximity for thickness reduction.
3Length of stationary object
If a conductive back cover is used to reduce thickness, then the thickness is reduced, but electro-magnetic interference occurs between the back cover and transformer
Solution Approach 1:
The insulating structure acts as a protective intermediary that shields the transformer from electro-magnetic interference caused by the conductive back cover. This structure allows the system to maintain the benefits of a thin conductive back cover while preventing harmful electro-magnetic interactions with the transformer.
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 shielding plate effectively reduces transformer power loss, heat generation, and prevents malfunctions by blocking electromagnetic interference between the transformer and the conductive back cover, maintaining efficient power consumption and operation.
Implementation Method 1
a shielding plate mounted on the circuit board and covering, in a non-contact manner, the upper surface of the transformer opposed to the lower surface of the transformer that faces the surface of the circuit board
Data Source
AI summary
There are provided a power module and a display device. There is provided the power module for a display device that includes a panel, a backlight unit supporting the panel and including a light source, and a conductive back cover coupled to the backlight unit, the power module including: a circuit board supplying power to the light source included in the backlight unit; a transformer mounted on the circuit board and supplying power to the circuit board; and a shielding plate mounted on the circuit board and covering, in a non-contact manner, the upper surface of the transformer opposed to the lower surface 401 of the transformer facing the surface of the circuit board. There is provided a display device including such a power module.