Dual-Transformer Multi-Output Converter for Slim Power Stages
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Solution Overview
Problem
The challenge is to develop an electronic apparatus that provides multi-output while reducing the height of the power conversion stage, particularly in slim display devices like TVs, where existing technologies face difficulties in minimizing the transformer's height and leakage inductance, leading to inefficiencies and increased costs.
Innovation Solution
The solution involves an electronic apparatus with a converter comprising a first reinforced insulation transformer and a second basic insulation transformer with an interleaved winding structure, where the secondary-side winding of the first transformer is a single winding, and the primary-side winding of the second transformer is connected to a node with the secondary-side winding and diode of the first rectifier, allowing for a slimmer design and reduced leakage inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional transformer structure is used to provide multi-output, then the power conversion stage can deliver multiple outputs, but the height of the transformer and power conversion stage increases
Solution Approach 1:
The patent divides the transformer into two separate transformers: a first transformer with reinforced insulation for high-voltage isolation and a second transformer with basic insulation for additional output. This segmentation allows each transformer to be optimized for its specific function, enabling multi-output capability while controlling the overall height by distributing functions across separate components rather than requiring a single tall transformer.
Solution Approach 2:
The patent transitions from a single-transformer vertical stacking approach to a two-transformer configuration where the second transformer's primary winding connects to the rectifier output node. This dimensional change in circuit topology allows the system to achieve multi-output functionality without simply increasing the height of a single transformer structure.
2Length of stationary object
If the transformer height is reduced for slim design, then the power conversion stage becomes slimmer, but the leakage inductance increases leading to inefficiency
Solution Approach 1:
By segmenting the power conversion function across two transformers with different insulation levels, the patent allows the first transformer to be optimized for compact height while the second transformer handles additional output requirements. This segmentation enables height reduction in critical areas without compromising overall performance.
Solution Approach 2:
The patent applies different insulation qualities to different transformers: the first transformer uses reinforced insulation for high-voltage isolation where safety is critical, while the second transformer uses basic insulation for additional output where compactness is prioritized. This local differentiation of quality allows optimization of height and leakage inductance in specific regions.
3Reliability
If reinforced insulation is applied to all transformers, then safety and isolation are improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies reinforced insulation only to the first transformer where high-voltage isolation is critical for safety, while the second transformer uses basic insulation. This localized application of reinforced insulation maintains safety where needed without unnecessarily complicating the entire system or increasing costs across all components.
Solution Approach 2:
The patent combines two transformers with different insulation levels into a unified power conversion system where the second transformer's primary winding connects to the rectifier output node. This merging allows the system to achieve multi-output functionality with differentiated insulation strategies, reducing overall complexity compared to applying reinforced insulation uniformly.
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
This configuration enables the electronic apparatus to provide multi-output while maintaining a slim profile, improving cross-regulation characteristics and reducing the number of turns and leakage inductance, thus enhancing efficiency and cost-effectiveness.
Implementation Method 1
a converter including a first transformer, the first transformer including a primary-side winding and a secondary-side winding; a first rectifier connected to the secondary-side winding of the first transformer
Data Source
AI summary
An electronic apparatus including a converter including a first transformer, the first transformer including a primary-side winding and a secondary-side winding; a first rectifier connected to the secondary-side winding of the first transformer, and including a diode; and a second transformer including a primary-side winding and a secondary-side winding, wherein the secondary-side winding of the first transformer is a single winding, and the primary-side winding of the second transformer is connected to a node to which the secondary-side winding of the first transformer and the diode included in the first rectifier are connected.