Magnetic Assembly Shielding Structure for Stable Leakage Inductance
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Solution Overview
Problem
The integration of a multi-slot transformer into a metal cavity leads to changes in leakage inductance and external leakage magnetic flux, affecting the stability of electrical parameters and increasing losses in on-board charger (OBC) systems, reducing power supply efficiency.
Innovation Solution
A magnetic assembly with a first magnetic core, windings, and a second magnetic core arranged between the cavity wall and windings to form a weak magnetic flux circuit, which adjusts and stabilizes leakage inductance, reducing external leakage magnetic flux and associated losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the multi-slot transformer is placed in the metal cavity for heat dissipation, then the heat dissipation performance is improved, but the leakage inductance changes and electrical parameter stability deteriorates
Solution Approach 1:
A magnetic shielding structure is introduced as an intermediary component between the transformer and the metal cavity wall. This shielding structure mediates the interaction by providing a dedicated magnetic flux path that prevents direct coupling between the transformer's leakage flux and the conductive cavity wall, thereby maintaining electrical parameter stability while allowing the transformer to remain in the metal cavity for heat dissipation.
2Temperature
If the multi-slot transformer is placed in the metal cavity, then the heat dissipation performance is improved, but eddy-current losses increase and power supply efficiency decreases
Solution Approach 1:
The magnetic shielding structure acts as a mediator that redirects the leakage magnetic flux through its own magnetic path rather than allowing it to penetrate the metal cavity wall. This prevents the formation of eddy currents in the cavity wall, reducing energy losses while maintaining the heat dissipation benefits of the metal cavity enclosure.
Solution Approach 2:
The invention converts the potentially harmful leakage magnetic flux into a beneficial element by providing it with a controlled path through the magnetic shielding structure. The shielding structure's high permeability material guides the flux through a dedicated path, transforming what would be a source of eddy-current losses into a controlled magnetic circuit that actually improves overall system efficiency.
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 maintains stable electrical parameters and reduces losses, enhancing the reliability and efficiency of the power supply apparatus by adjusting leakage inductance and guiding external leakage magnetic flux.
Implementation Method 1
a second magnetic core, where the second magnetic core is arranged between a cavity wall of the accommodating cavity and the plurality of windings
Implementation Method 2
due to the mutual influence between the metal cavity and the external leakage magnetic flux of the transformer, on the one hand, it very easily results in a change of the leakage inductance of the multi-slot transformer
Implementation Method 3
the cavity is cooled by means of air cooling or liquid cooling or other heat-dissipation ways
Implementation Method 4
air cooling or liquid cooling
Implementation Method 5
the external leakage magnetic flux will further result in eddy-current losses on the cavity, which will increase the total loss of the OBC
Data Source
AI summary
The disclosure provides a magnetic assembly and a power supply apparatus. The magnetic assembly of the present disclosure includes: a first magnetic core, a plurality of windings, a housing and a second magnetic core, where the first magnetic core has a winding area, and the plurality of windings are wound with an interval on the winding area of the first magnetic core; the housing has an accommodating cavity, and at least part of the plurality of windings is accommodated in the accommodating cavity, and the second magnetic core is arranged between a cavity wall of the accommodating cavity and the plurality of windings. According to the present disclosure, parasitic parameters such as leakage inductance of the magnetic assembly are relatively stable, and the power supply efficiency is improved and higher.