Powder Core Coupled Inductor Adjustable Leakage
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Solution Overview
Problem
Conventional multi-phase DC-to-DC converters with coupled inductors face challenges in achieving optimal leakage inductance and magnetic coupling, leading to inefficiencies in ripple current management and transient response.
Innovation Solution
The development of coupled inductors with windings embedded in a magnetic core formed from powder magnetic material, such as powdered iron within a binder, allows for adjustable leakage inductance and inverse magnetic coupling, enabling efficient ripple current management and improved transient response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If windings are wound through passageways in a magnetic core, then magnetic coupling is achieved, but leakage inductance control becomes difficult and manufacturing complexity increases
Solution Approach 1:
The magnetic core is segmented into multiple discrete powder magnetic particles bound together with a binder, allowing windings to be embedded within the core material itself rather than requiring pre-formed passageways. This segmentation enables independent positioning of windings and simplifies manufacturing while maintaining magnetic coupling through the distributed powder structure.
Solution Approach 2:
The windings are nested within the powder magnetic core material, with the core material formed around and between the windings. This nested configuration achieves magnetic coupling while allowing direct embedding of windings in the core, eliminating the need for separate passageway structures and reducing manufacturing complexity.
2Reliability
If conventional coupled inductors are used, then ripple current management is compromised, but manufacturing simplicity is maintained
Solution Approach 1:
The coupled inductor design enables dynamic control of ripple current through adjustable leakage inductance achieved by varying winding separation distances and powder core properties. This dynamic capability allows optimization of ripple current management for different operating conditions while maintaining a relatively simple manufacturing process using powder metallurgy techniques.
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 enhances the efficiency of DC-to-DC converters by allowing for adjustable leakage inductance and inverse magnetic coupling, reducing ripple current and improving transient response without efficiency penalties.
Implementation Method 1
coupled inductors with windings embedded in a magnetic core formed from powder magnetic material, such as powdered iron within a binder, allows for adjustable leakage inductance and inverse magnetic coupling
Implementation Method 2
first and second windings at least partially embedded in the magnetic core. The first winding is electrically coupled between the first and second terminals, and the second winding is electrically coupled between the third and fourth terminals
Data Source
AI summary
A multi-phase coupled inductor includes a powder core material magnetic core and first, second, third, and fourth terminals. The coupled inductor further includes a first winding at least partially embedded in the core and a second winding at least partially embedded in the core. The first winding is electrically coupled between the first and second terminals, and the second winding electrically is coupled between the third and fourth terminals. The second winding is at least partially physically separated from the first winding within the magnetic core. The multi-phase coupled inductor is, for example, used in a power supply.