Planar Transformer Stacked Windings for High Power Density
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Solution Overview
Problem
DC-DC switching regulators face challenges in efficiently stepping down high supply voltages to low output voltages and vice versa, particularly in achieving high power density and compact layouts for electronic devices.
Innovation Solution
A multiple-layer planar transformer design with a multiple-turn first winding and a single-turn second winding, magnetically coupled via a core, where the second winding's individual traces are electrically coupled in parallel to enhance power density and layout efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional high-frequency switching regulators are used for voltage conversion, then voltage conversion function is achieved, but power density is limited and layout area is large
Solution Approach 1:
The patent transitions from traditional planar winding structures to a three-dimensional stacked configuration where multiple inductors are vertically arranged and magnetically coupled. This vertical stacking approach utilizes the third dimension (height) to increase power density without proportionally increasing the planar footprint, effectively resolving the contradiction between power density and layout area.
Solution Approach 2:
The patent combines multiple inductor functions into a single integrated magnetic component structure. By stacking multiple inductors and magnetically coupling them, the design achieves multiple functions (voltage conversion, filtering, energy storage) in one compact unit, thereby improving power density while reducing overall layout area.
2Power
If multiple inductors are stacked and magnetically coupled, then power density is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the magnetic component into discrete, modular inductor units that can be independently manufactured and then stacked. Each inductor module contains its own winding and magnetic core, allowing for standardized production processes and simplified assembly through magnetic coupling, thereby managing manufacturing complexity while achieving high power density.
Solution Approach 2:
The stacked inductor structure serves multiple functions simultaneously: voltage conversion through magnetic coupling, energy storage in each inductor, and filtering through the combined inductance. This multi-functionality reduces the need for separate components, simplifying the overall manufacturing process despite the three-dimensional configuration.
3Power
If high supply voltage is converted to low output voltage, then voltage regulation is achieved, but efficiency is reduced due to switching losses
Solution Approach 1:
The patent employs periodic high-frequency switching of the semiconductor devices to control the magnetic coupling between stacked inductors. This periodic action enables regulated voltage conversion while the magnetic coupling architecture reduces switching losses through improved energy transfer efficiency between the inductor stages.
Solution Approach 2:
The magnetically coupled inductor structure acts as an intermediary energy transfer mechanism between the high-voltage input and low-voltage output. This magnetic coupling provides galvanic isolation and reduces direct switching losses by distributing the voltage conversion across multiple inductive stages rather than a single switching event.
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 design achieves improved power density and efficient voltage conversion, enabling compact and high-power DC-DC converters with enhanced performance in both step-down and step-up applications.
Implementation Method 1
The first and second windings can be magnetically coupled such as via a core
Data Source
AI summary
A space efficient planar transformer can include a coupled inductor circuit that can include a metallic core, a first planar winding comprising a conductive coil having an electrical path encircling a first post of the metallic core, and a second planar winding configured to magnetically couple with the first winding via the metallic core. The second planar winding can have multiple portions. A portion of the second winding can include a first sub-portion comprising a single U-shaped planar conductive trace wrapped about the first post and a second sub-portion comprising a single U-shaped planar conductive trace wrapped about the first post. A layout of the first sub-portion can be oriented opposite a layout of the second sub-portion.