High Frequency Semiconductor Transformer Core Domain Orientation
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Solution Overview
Problem
Conventional high-frequency semiconductor transformers face limitations in permeability and frequency range due to the orientation of magnetic domains within the core material, which restricts their performance at high frequencies.
Innovation Solution
The transformer design incorporates a core with magnetic domain patterns where the easy axis is perpendicular to the length and the hard axis is parallel to the direction of the magnetic field, allowing for higher frequency operation by maintaining permeability even when the magnetic field changes direction rapidly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional magnetic domain orientation is used in the core, then the transformer operates at lower frequencies with adequate permeability, but the frequency range and high-frequency performance are limited
Solution Approach 1:
The patent changes the magnetic domain orientation parameters within the core material. Specifically, it creates a multi-domain structure where domains are oriented at different angles (including perpendicular to the film plane) to optimize magnetic permeability at high frequencies while maintaining stability
Solution Approach 2:
The patent employs a composite magnetic core structure with multiple domain orientations. This composite approach combines domains with different magnetic properties to achieve both high-frequency operation and maintained permeability, resolving the contradiction between frequency range and reliability
2Reliability
If the easy axis is parallel to the magnetic field direction, then permeability is maximized at low frequencies, but the transformer cannot maintain permeability when the magnetic field changes direction rapidly at high frequencies
Solution Approach 1:
The patent segments the magnetic core into multiple domains with different orientations rather than having a single uniform domain structure. This segmentation allows different domains to respond to magnetic field changes in complementary ways, maintaining overall permeability during rapid field reversals at high frequencies
Solution Approach 2:
The patent creates a dynamic multi-domain structure that can adapt during magnetic field cycles. The domains are configured to switch and reorient in a controlled manner, enabling the core to maintain permeability dynamically during rapid field changes rather than being static and limited to low-frequency operation
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 enhances permeability along the hard axis, enabling high-frequency operation beyond conventional limits, with permeability significantly greater than air-core semiconductor transformers, particularly at frequencies above 1 MHz.
Implementation Method 1
a magnetic material, known as a core, to increase the inductance and the amount of energy that is transferred from the primary coil to the secondary coil
Implementation Method 2
A transformer is a well-known structure that inductively transfers electrical energy from a primary coil to a secondary coil
Data Source
AI summary
A semiconductor transformer provides high frequency operation by forming the primary windings of the transformer around a section of magnetic material that has a hard axis that lies substantially parallel to the direction of the magnetic field generated by the primary windings. The core can also be formed to have a number of sections where the magnetic flux follows the hard axis through each section of the core.