Active Self-Synchronized Rectifier for Isolation Barrier Power Transfer
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Solution Overview
Problem
Conventional galvanic isolation systems face inefficiencies in power transfer across isolation barriers due to power dissipation through diodes and complex driver circuits, and limitations in microfabrication, resulting in larger footprints and reduced power transfer efficiency.
Innovation Solution
The implementation of an active self-synchronized rectifier with a microfabricated transformer or capacitor as an isolation component, utilizing a full bridge configuration of switches and inductors to achieve high-efficiency DC to DC power conversion across an isolation barrier, allowing for microfabrication on chip and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional diode-based rectifiers are used for power transfer across isolation barriers, then galvanic isolation is achieved, but power dissipation increases and power transfer efficiency decreases
Solution Approach 1:
The patent changes the operating parameters by using active devices (MOSFETs) instead of passive diodes, enabling controlled switching operation that reduces conduction losses and improves power transfer efficiency while maintaining galvanic isolation through the transformer
2Area of moving object
If microfabricated transformers are used for isolation, then device footprint is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into a single microfabricated integrated circuit chip, combining the transformer, rectifier, and control circuitry into one compact device, thereby reducing overall footprint while managing manufacturing complexity through integration
3Reliability
If active devices are used instead of diodes in the rectifier, then power transfer efficiency improves, but device complexity increases
Solution Approach 1:
The patent implements self-synchronized operation where the active devices automatically coordinate their switching based on the transformer's natural oscillations and circuit conditions, eliminating the need for external control circuits and reducing overall system complexity despite using active devices
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 approach enables high-efficiency DC to DC power conversion with reduced footprint and improved power transfer efficiency, facilitating compact and cost-effective solutions for various applications by operating at high frequencies and simplifying circuit design.
Implementation Method 1
an isolation component having a first terminal and a second terminal... Microfabricated transformer or microfabricated capacitor as an isolation component
Implementation Method 2
a first inductor coupled between the first and second active devices and the first DC output terminal, and a second inductor coupled between the third and fourth active devices and the second DC output terminal
Data Source
AI summary
Systems and methods for transferring power across an isolation barrier using an active self-synchronized rectifier are described. A rectifier as described herein may provide DC to DC power conversion with high efficiency. Furthermore, by using a microfabricated transformer or microfabricated capacitor as an isolation component, an isolation component and rectifier may be microfabricated and implemented on chip.