Transformer Core Geometry for Leakage Inductance in Display Power
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Solution Overview
Problem
Display devices face challenges in generating power signals of different voltages to simultaneously drive multiple circuits, requiring an effective scheme for inductive coupling between inductors in the transformer.
Innovation Solution
A display device with a transformer having a core with a protrusion of varying cross-sectional areas, where inductor sub-assemblies are wound around bobbins matching these areas, enhancing inductive coupling and leakage inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a transformer is used to generate power signals of different voltages for simultaneously driving multiple circuits, then the power supply capability is improved, but the leakage inductance is insufficient for driving the connected circuitry
Solution Approach 1:
The core structure employs local quality variation by creating protrusions with different cross-sectional areas at different locations. The first protrusion has a first cross-sectional area while the second protrusion has a second cross-sectional area different from the first, allowing each region to provide optimized magnetic coupling characteristics for different inductor sub-assemblies. This enables the transformer to simultaneously provide adequate power supply capability while achieving the required leakage inductance levels for driving connected circuitry.
Solution Approach 2:
The invention applies parameter changes by varying the cross-sectional area parameter of the core protrusions. By changing the cross-sectional area from the first area to the second area, the magnetic coupling characteristics are adjusted, which directly controls the leakage inductance. This parameter variation allows the transformer to achieve both sufficient power supply capability and adequate leakage inductance for driving the connected circuitry without compromising either function.
2Productivity
If inductive coupling between inductors is enhanced to drive multiple circuits, then the power distribution efficiency is improved, but the leakage inductance becomes insufficient
Solution Approach 1:
The core structure uses local quality differentiation with protrusions of varying cross-sectional areas to simultaneously optimize magnetic coupling for power distribution efficiency while maintaining adequate leakage inductance. The first and second protrusions with different cross-sectional areas create distinct magnetic coupling zones that balance these two competing requirements.
Solution Approach 2:
By changing the cross-sectional area parameter of the core protrusions, the invention optimizes the balance between power distribution efficiency and leakage inductance. The variation in cross-sectional area from the first to the second protrusion adjusts the magnetic coupling strength, enabling both high power distribution efficiency and sufficient leakage inductance for driving connected circuitry.
3Ease of manufacture
If a simple core structure is used to reduce manufacturing complexity, then the ease of manufacture is improved, but the leakage inductance cannot be controlled at necessary levels
Solution Approach 1:
The core structure implements local quality variation through protrusions with different cross-sectional areas, providing controlled leakage inductance while maintaining manufacturing feasibility. The first and second protrusions with distinct cross-sectional areas create the necessary magnetic coupling characteristics without requiring overly complex manufacturing processes.
Solution Approach 2:
The invention controls leakage inductance by changing the cross-sectional area parameter of the core protrusions. This parameter variation achieves the necessary leakage inductance levels for driving connected circuitry while maintaining a core structure that remains manufacturable, balancing manufacturing simplicity with electrical performance requirements.
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 increases leakage inductance to levels necessary for driving circuitry connected to the transformer, effectively addressing the challenge of simultaneous power signal generation for multiple circuits.
Implementation Method 1
a transformer used to generate power signals for simultaneously driving a plurality of circuits installed in the display device, which may often require a scheme for utilizing inductive coupling between inductors included in the transformer
Implementation Method 2
a core including a first surface and a protrusion protruding from the first surface along a direction which the first surface faces. In the core, a cross-section of a first portion of the protrusion perpendicular to the direction has a first area, and a cross-section of a second portion of the protrusion between the first portion and the first surface has a second area larger than the first area
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A display device according to an embodiment may comprise a transformer comprising: a core including a first surface and a protruding portion protruding from the first surface along a direction in which the first surface faces, wherein a cross-section of a first portion of the protruding portion perpendicular to the direction in which the first surface faces has a first area, and a cross-section of a second portion of the protruding portion between the first portion and the first surface has a second area greater than the first area; a first inductor sub-assembly including a first bobbin which includes a first opening corresponding to the first area, so as to contact the outer circumference of the first portion of the core, and an inductor wound around the first bobbin; and a second inductor sub-assembly including a second bobbin which includes a second opening corresponding to the second area, so as to contact the outer circumference of the second portion of the core, and an inductor wound around the second bobbin.