Multi-Parallel Magnetic Cancellation Transformer for DC-DC Converters
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Solution Overview
Problem
Conventional DC-DC converters face challenges in reducing size and maintaining power conversion efficiency, especially when the step-up/down rate exceeds two, due to increased ripple current and magnetic saturation, which leads to larger passive components and decreased efficiency.
Innovation Solution
A multi-parallel magnetic-field cancellation type transformer with coils wound around magnetic leg portions and a base, where the magnetic flux directions are opposite to cancel each other, forming homogeneous closed magnetic circuits to reduce magnetic saturation and core loss, and connected in parallel to reduce current and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the step-up/down rate is equal to or greater than two times, then the voltage conversion capability is improved, but the ripple current increases
Solution Approach 1:
The patent divides the single transformer into multiple transformers with different step-up/down rates connected in parallel. Each transformer handles a portion of the total current, and their combined effect reduces the overall ripple current while maintaining high voltage conversion capability. The segmentation of the magnetic circuits allows each transformer to operate at optimal conditions.
Solution Approach 2:
The patent combines multiple transformers with different step-up/down rates in parallel to achieve both high voltage conversion capability and reduced ripple current. By merging the output of multiple transformers, the system benefits from the complementary characteristics of each transformer, where the ripple components cancel each other out.
2Adaptability or versatility
If the ripple current increases, then the voltage conversion range is improved, but the electric power conversion efficiency deteriorates
Solution Approach 1:
The patent segments the power conversion function across multiple transformers, each operating at different step-up/down rates. This segmentation allows the system to achieve wide voltage conversion range while each individual transformer operates at higher efficiency points, reducing overall energy loss.
Solution Approach 2:
The patent changes the operating parameters of multiple transformers by assigning different step-up/down rates to each. This parameter diversification allows the system to maintain high conversion efficiency across a wide voltage range, as each transformer can be optimized for its specific operating point.
3Reliability
If the number of coils disposed in parallel increases, then the magnetic saturation is prevented, but the transformer size increases
Solution Approach 1:
The patent segments the magnetic flux paths into multiple independent closed magnetic circuits. Each circuit is designed with homogeneous magnetic resistance, allowing the magnetic flux to be evenly distributed. This prevents magnetic saturation in any single path while keeping the overall transformer size compact through efficient space utilization.
Solution Approach 2:
The patent designs the magnetic circuits to have homogeneous magnetic resistance, ensuring uniform distribution of magnetic flux across all parallel paths. This homogeneity prevents localized magnetic saturation and allows for compact transformer design, as the magnetic flux is evenly utilized throughout the core structure.
4Stability of the object's composition
If the closed magnetic circuits are formed with homogeneous magnetic resistance, then the magnetic flux distribution is equalized, but the device complexity increases
Solution Approach 1:
The patent divides the magnetic circuit into multiple segmented paths with homogeneous magnetic resistance. Each segment is designed independently to have equal magnetic resistance, which simplifies the design process while achieving uniform magnetic flux distribution. The segmented structure actually reduces complexity compared to designing a single complex path.
Solution Approach 2:
The patent applies homogeneity principle by designing all magnetic circuit paths to have equal magnetic resistance. This uniformity simplifies the overall magnetic circuit design, as identical or symmetric structures can be reused, reducing design complexity while ensuring balanced magnetic flux distribution.
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 effectively reduces the size of the transformer, prevents magnetic saturation, and improves power conversion efficiency by equalizing magnetic flux density and reducing ripple current, allowing for smaller capacitors and inductors while maintaining high efficiency.
Implementation Method 1
a plurality of coils which generate magnetic flux when energized
Implementation Method 2
the direction of the magnetic flux generated from the plurality of coils are opposite to each other in any couple selected from among the pieces of magnetic flux, so that the magnetic flux is cancelled out with each other
Implementation Method 3
a core which includes a plurality of magnetic leg portions about which the coils are wound, and a base for fixing the plurality of magnetic leg portions, wherein a plurality of closed magnetic circuits of the magnetic flux are formed in the magnetic leg portions and the bases
Implementation Method 4
a magnetic resistance of at least the smallest closed magnetic circuit from among the plurality of closed magnetic circuits is homogeneous
Implementation Method 5
converting a voltage and an electric power conversion circuit including the transformer
Data Source
AI summary
A multi-parallel magnetic-filed cancellation type transformer includes a plurality of coils which generate magnetic flux during energization and a core having a plurality of magnetic leg portions on which the coils are wound, and bases for fixing the magnetic leg portions. The plurality of coils are wound on the magnetic leg portions in such a manner that the magnetic flux generated from the coils are formed in the directions opposite to each other. A plurality of closed magnetic circuits of the magnetic flux are formed at the magnetic leg portions and the bases. The magnetic resistance of the closed magnetic circuits is homogeneous. Accordingly, the transformer can reduce the size thereof, and prevent the deterioration of electric power conversion efficiency.