Inductor Assembly with Magnetic Isolation for Power Supply Efficiency

Solution Overview

Problem

Existing multiphase switching power supplies face inefficiencies due to the need for separate cores for magnetically coupled and uncoupled inductors, which increases size and cost, and does not adapt well to varying load conditions.

Innovation Solution

An inductor assembly with a common core for both coupled and uncoupled inductors, allowing selective activation of phases based on load conditions to optimize efficiency, using a core with specific magnetic forms and gaps to manage flux and inductance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate cores are used for magnetically coupled and uncoupled inductors, then magnetic coupling performance is improved, but device size and cost increase

Engineering Contradiction:

Improvemagnetic coupling performanceVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent combines both magnetically coupled and uncoupled inductors onto a single shared core structure. The core includes a first leg with a first inductor and a second leg with a second inductor, both sharing common magnetic path segments. This merging eliminates the need for separate cores while maintaining the required magnetic coupling characteristics through the shared magnetic path.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared core structure serves multiple functions simultaneously: it provides magnetic coupling for the first inductor, magnetic isolation for the second inductor, and a common magnetic path for both. The core design enables it to fulfill multiple roles that would traditionally require separate dedicated cores, reducing overall device size and component count.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If separate cores are used for magnetically coupled and uncoupled inductors, then magnetic coupling performance is improved, but manufacturing cost increases

Engineering Contradiction:

Improvemagnetic coupling performanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines both magnetically coupled and uncoupled inductors onto a single shared core structure. The core includes a first leg with a first inductor and a second leg with a second inductor, both sharing common magnetic path segments. This merging eliminates the need for separate cores while maintaining the required magnetic coupling characteristics through the shared magnetic path.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared core structure serves multiple functions simultaneously: it provides magnetic coupling for the first inductor, magnetic isolation for the second inductor, and a common magnetic path for both. The core design enables it to fulfill multiple roles that would traditionally require separate dedicated cores, reducing overall device size and component count.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If fixed phase activation is used, then control simplicity is improved, but energy efficiency deteriorates under varying load conditions

Engineering Contradiction:

Improvecontrol simplicityVSAvoidenergy dissipation

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The patent implements dynamic phase activation control where the controller selectively activates or deactivates the second inductor based on real-time load conditions. When the load current exceeds a threshold, the second inductor is activated to share the load and reduce losses. When the load is light, the second inductor is deactivated to save energy. This dynamic adjustment optimizes energy efficiency across varying load conditions while maintaining relatively simple control logic.

Inventive Principle:

Principle #15Dynamics

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 solution reduces the size and cost of power supplies while improving efficiency by allowing adaptive phase activation, reducing energy dissipation and heat generation across varying load conditions.

Implementation Method 1

an isolating region that magnetically isolates the first group of forms from the second group of forms

Methodology Applied

Scientific EffectMagnetic isolation: Magnetic Field

Implementation Method 2

The core includes first and second members, a first group of one or more forms extending between the members, a second group of one or more forms extending between the members

Methodology Applied

Scientific EffectMagnetic flux: Magnetic Field

Data Source

PatentUS8179116B2Inductor assembly having a core with magnetically isolated forms

Publication Date: 2012.05.15 INTERSIL AMERICAS INC

AI summary

An embodiment of an inductor assembly includes a core, a first conductor, and a second conductor. The core includes first and second members, a first group of one or more forms extending between the members, a second group of one or more forms extending between the members, and an isolating region that magnetically isolates the first group of forms from the second group of forms. The first conductor is wound about a first one of the forms in the first group, and the second conductor is wound about a second one of the forms in the second group. Such an inductor assembly may allow both coupled and uncoupled inductors to be disposed on a common core, thus potentially reducing the cost and size of the inductors as compared to the coupled inductors being disposed on one core and the uncoupled inductors being disposed on another core.