Litz-Wire Transformer Winding With Equipotential Field Balancing
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Solution Overview
Problem
High-frequency, high-voltage, and high-power transformers face challenges in implementing semi-conductive layers due to the difficulty of connecting them to Litz wire without damaging the insulation, leading to heating issues from high-frequency eddy current losses.
Innovation Solution
A transformer design that includes a semi-conductive layer connected to a preset equipotential connection point provided by an auxiliary circuit, which is connected to the body winding, allowing for improved electric field distribution without damaging the insulation between strands of Litz wire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the semi-conductive layer is directly connected to the Litz wire winding, then the electric field distribution is improved, but the insulation between strands of Litz wire is damaged causing heating
Solution Approach 1:
An auxiliary circuit is introduced as an intermediary between the semi-conductive layer and the Litz wire winding. The auxiliary circuit provides an equipotential connection point that allows the semi-conductive layer to be connected without directly contacting the Litz wire strands, thus maintaining insulation integrity while achieving proper electric field distribution.
2Reliability
If the semi-conductive layer is connected to the Litz wire winding, then the electric field distribution is improved, but the connection process becomes difficult without damaging insulation
Solution Approach 1:
The auxiliary circuit serves as a mediator that simplifies the manufacturing process. By providing a dedicated connection point through the auxiliary circuit, the semi-conductive layer can be connected without the complex and risky process of accessing individual Litz wire strands, making the manufacturing process easier and more reliable.
3Reliability
If an auxiliary circuit is introduced to provide equipotential connection, then the insulation integrity is maintained, but the device complexity increases
Solution Approach 1:
The auxiliary circuit is merged with the existing transformer structure, sharing the magnetic core and winding space. This integration approach minimizes the additional complexity by utilizing existing components and spaces rather than adding completely separate structures.
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 design effectively balances the electric field distribution and prevents excessive local electric field intensity in the transformer, minimizing heating issues and maintaining insulation integrity.
Implementation Method 1
the auxiliary circuit and a preset position of the body winding have an equal potential
Implementation Method 2
improving the distribution of an electric field of the winding and preventing excessive local electric field intensity of the transformer
Implementation Method 3
in order to prevent high-frequency eddy current losses caused by skin effect and proximity effect, Litz wire is often used to wind a winding of the transformer
Implementation Method 4
prevent high-frequency eddy current losses caused by skin effect and proximity effect
Data Source
AI summary
The present invention provides a transformer, which is applied to the technical field of power transmission and distribution, the transformer comprising an iron core, body windings, and a semi-conductive layer, the body windings being sleeved on a core post of the iron core, and the semi-conductive layer being correspondingly provided with the body windings. Auxiliary circuits are connected to the body windings, the auxiliary circuits and preset positions of the body windings have equal potentials, and an equipotential connection point of the semi-conductive layer is provided by the auxiliary circuits. After the semi-conductive layer is connected to the auxiliary circuits, the effect of balancing the electric field distribution of a winding can be achieved. In the transformer provided in the present invention, an equipotential connection point having an equal potential with the preset positions of the body windings of the transformer is provided by means of the auxiliary circuits, and the semi-conductive layer is directly connected to the equipotential connection point, thereby achieving set effects of the semi-conductive layer, that is, improving the electric field distribution of windings, and improving the high-voltage insulation performance of the transformer without damaging the insulation between litz wire strands.