Segmented Reactor Core for Adjustable Coupling
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Solution Overview
Problem
Existing interleaved step-up circuits with reactors face challenges in adjusting the coupling coefficient of coils to achieve a suitable step-up ratio while minimizing ripple current, which is crucial for practical applications.
Innovation Solution
The reactor design includes two coils with a core structure composed of different relative permeability materials, where the upper and lower core parts have higher permeability, and the inner and outer core parts have lower permeability, allowing for adjustable coupling by varying the distance between the coils, thereby optimizing flux linkage and reducing ripple current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coupling coefficient of two coils is increased to improve magnetic properties, then the electromagnetic property of the reactor is improved, but the ripple current is dramatically increased when the duty ratio is far from 0.5
Solution Approach 1:
The core is segmented into five distinct parts (upper core part, lower core part, inner core part, outer core part, and middle core part) with different relative permeability characteristics. This segmentation allows independent optimization of magnetic flux paths for each coil while controlling their interaction, enabling the coupling coefficient to be adjusted without causing excessive ripple current.
Solution Approach 2:
Different parts of the core have different relative permeability values - the upper and lower core parts have high relative permeability to enhance flux linkage, while the inner and outer core parts have low relative permeability to control coupling. This local differentiation allows the reactor to achieve good electromagnetic properties while maintaining controlled coupling coefficients.
2Object-generated harmful factors
If the coupling coefficient is adjusted to reduce ripple current, then the step-up circuit performance is improved, but the magnetic properties of the reactor may deteriorate
Solution Approach 1:
The core structure provides high relative permeability in the upper and lower core parts to maintain strong magnetic properties and flux linkage, while the inner and outer core parts have low relative permeability to control the coupling coefficient. This local quality differentiation ensures both good magnetic properties and controlled coupling.
Solution Approach 2:
The core is constructed as a composite structure combining materials or regions with different relative permeability characteristics. This composite approach allows simultaneous achievement of high magnetic property (through high permeability regions) and controlled coupling (through low permeability regions).
3Ease of manufacture
If a fixed core structure is used, then the manufacturing is simplified, but the coupling coefficient cannot be appropriately adjusted for different step-up ratio requirements
Solution Approach 1:
The core is divided into five separate parts that can be manufactured independently and then assembled. This segmentation provides adjustment flexibility - the distance between coils can be modified by repositioning the middle core part or adjusting the overall assembly, allowing coupling coefficient optimization for different step-up ratios while maintaining relatively simple manufacturing of each individual part.
Solution Approach 2:
The core structure is designed to allow dynamic adjustment of the coupling coefficient through positional changes of the coil assembly relative to the core parts. This enables the reactor to adapt to different operating conditions and step-up ratio requirements without requiring complete redesign.
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 easy adjustment of the coupling coefficient within a desired range, improving magnetic properties and reducing ripple current in the step-up circuit, making it suitable for actual use.
Implementation Method 1
The core has an outer core part, an inner core part, an upper core part, a lower core part and a middle core part... The second member has a relative permeability which is greater than a relative permeability of the first member
Implementation Method 2
a reactor comprising two coils and a core... Each of the first coil and the second coil is embedded in the core
Data Source
AI summary
A reactor comprises a first coil, a second coil and a core. Each of the first coil and the second coil is embedded in the core. The core has an outer core part, an inner core part, an upper core part, a lower core part and a middle core part. The upper core part is positioned above an upper end of a cross-section of the first coil in an up-down direction. The lower core part is positioned below a lower end of a cross-section of a second coil in the up-down direction. The core is made of a first member and a second member. The second member has a relative permeability which is greater than a relative permeability of the first member. Each of the upper core part and the lower core part is made of the second member.