Transformer Leakage Inductance Layout for Primary-Side Concentration
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Solution Overview
Problem
Existing electrical transformers face inefficiencies due to leakage inductance, which leads to energy loss and potential overheating or component failure, as the distribution of leakage inductance between the primary and secondary circuits is difficult to control, especially in resonant converters where precise distribution is crucial for optimal operation.
Innovation Solution
The solution involves configuring an electrical transformer with specific inductance measurements and geometric adjustments to concentrate the leakage inductance on the primary circuit, using equations to determine the air gap thickness, leakage reluctance, and winding distances to achieve a desired distribution of inductance values, ensuring the majority of leakage inductance is on the primary circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the leakage inductance is distributed between primary and secondary circuits, then the transformer can transfer energy efficiently, but the control of leakage inductance distribution becomes difficult and may lead to overheating or component failure
Solution Approach 1:
The patent segments the leakage inductance into two distinct components: Llk1 on the primary circuit and Llk2 on the secondary circuit. This segmentation allows independent control and optimization of each component, enabling precise management of the leakage inductance distribution to prevent overheating and component failure while maintaining efficient energy transfer.
Solution Approach 2:
The patent applies local quality by positioning specific leakage inductance values at specific locations (primary vs. secondary circuits). By assigning Llk1 to the primary circuit and Llk2 to the secondary circuit with different characteristic values, the transformer achieves optimized local performance in each circuit while maintaining overall system efficiency.
2Productivity
If the leakage inductance is concentrated on the primary circuit, then the resonant converter operates optimally, but the leakage inductance on the secondary circuit becomes negligible which may affect energy transfer
Solution Approach 1:
The patent changes the parameters of leakage inductance distribution by establishing specific relationships between Llk1 and Llk2. By defining that Llk1 should be greater than Llk2 (with a ratio greater than 10), the patent optimizes the transformer for resonant converter operation while maintaining sufficient energy transfer capability through the secondary circuit.
3Adaptability or versatility
If discrete resonant inductance components are used, then the resonant converter can be implemented, but the cost and bulk of the circuit increase
Solution Approach 1:
The patent merges the resonant inductance function with the transformer's leakage inductance. Instead of using a separate discrete resonant inductance component, the patent utilizes the transformer's inherent leakage inductance (Llk1 and Llk2) to fulfill the resonant converter requirements, thereby eliminating additional components and reducing circuit bulk and cost.
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 approach allows for precise control of leakage inductance distribution, reducing energy losses and minimizing the risk of overheating or component failure by concentrating the leakage inductance on the primary circuit, thus optimizing the operating point of the transformer.
Implementation Method 1
a magnetic core and coils are used in which an electrical current circulates which generates a magnetic field enabling the transfer of electrical energy from the primary circuit to the secondary circuit
Implementation Method 2
All electrical transformers have a leakage inductance, which results in a loss of efficiency because a part of the magnetic flux created on the primary circuit is not captured by the windings of the secondary circuit
Data Source
AI summary
The present invention relates to an electrical transformer comprising a magnetic core and a primary coil, forming a primary circuit, and a secondary coil, forming a secondary circuit, electrical transformer configured such that:a first inductance value L1so measured on the primary circuit with the secondary circuit open,a second inductance value L1ss measured on the primary circuit with the secondary circuit short-circuited, anda third inductance value L2po measured on the secondary circuit with the primary circuit open, are such that:L2PO-1n2LM<(1A)·(L1SO-LM)withLM=√{square root over ((L1SO−L1SS)×L1SO·N2)}where A is a real number greater than 10.