Transformer Symmetrical Winding for Voltage Stability
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Solution Overview
Problem
Conventional multi-output transformers with asymmetrically disposed secondary windings relative to the core gap exhibit differing inductance and coupling coefficients, leading to output voltage disparities between secondary windings.
Innovation Solution
A transformer configuration with secondary windings spaced equally from both the primary winding and the core gap, optionally incorporating auxiliary windings connected in parallel, ensures symmetrical arrangement and reduced inductance and coupling coefficient differences, stabilizing output voltages across secondary windings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If secondary windings are asymmetrically disposed with respect to the core gap, then the structure is simpler to manufacture, but the inductance of each secondary winding becomes different causing output voltage differences
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing the winding arrangement to be symmetric with respect to the core gap. The secondary windings are positioned at equal distances from the gap on opposite sides, creating a symmetric configuration that ensures equal magnetic coupling and identical inductance values, thereby resolving the output voltage inconsistency issue
2Manufacturing precision
If secondary windings are spaced equally from the core gap, then inductance values are equalized, but the coupling coefficient with the primary winding still differs due to distance variation
Solution Approach 1:
The patent resolves this contradiction by establishing a fully symmetric winding arrangement where secondary windings are positioned at equal distances from both the core gap and the primary winding. This dual symmetry ensures that both inductance values and coupling coefficients are equalized across all secondary windings, achieving reliable and consistent output voltages
3Volume of moving object
If secondary windings are disposed at different distances from the primary winding, then winding space utilization is improved, but the coupling coefficient becomes different causing output voltage differences
Solution Approach 1:
The patent maintains symmetric positioning of secondary windings relative to both the core gap and the primary winding. This symmetric arrangement ensures equal coupling coefficients and identical inductance values, thereby achieving equal output voltages while still utilizing the available winding space efficiently through optimized turn ratios and winding densities
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 effectively suppresses output voltage differences between secondary windings by equalizing inductance and coupling coefficients, enhancing voltage stability and transformation efficiency in switched-mode power supply applications.
Implementation Method 1
a primary winding which is provided in a core, and at least two secondary windings which are also provided in the core
Data Source
AI summary
A transformer is capable of suppressing the output voltage difference, and a switched-mode power supply apparatus uses the transformer. A transformer has a core; a primary winding provided in the core; a gap provided in the core at a location where the primary winding is provided; and at least two secondary windings, provided in the core and spaced apart from both sides of the primary winding as well as the gap at an equal distance in a winding axis direction of the primary winding. A switched-mode power supply apparatus has the transformer; a switching element connected to the primary winding of the transformer; and a control circuit configured to control the switching element.