Single-Transformer Full-Duplex Digital Isolator Design
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Solution Overview
Problem
Existing full-duplex digital transmission across a galvanic isolation barrier requires complex magnetics, such as dual transformers, which are not advantageous for modern digital communication, and pose challenges in minimizing capacitance and cost, especially when dealing with IGBT desaturation fault signals.
Innovation Solution
A single transformer full-duplex digital isolator design that allows simultaneous bidirectional transmission of digital data streams through a galvanic isolation barrier using two coupled circuits with pulse generators and transistors, enabling independent signal transmission and reception on both sides of the transformer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual transformers are used for full-duplex digital isolation, then bidirectional transmission capability is achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges two separate transformers into a single transformer with two secondary windings, allowing full-duplex digital isolation without requiring dual transformers. The single transformer with properly configured windings enables simultaneous bidirectional transmission while reducing magnetic component complexity and cost.
Solution Approach 2:
The single transformer is designed to perform multiple functions: it provides galvanic isolation for both directions of transmission simultaneously, enabling full-duplex operation. The transformer's primary winding and two secondary windings are configured to handle both A→B and B→A signal paths through a unified magnetic core structure.
2Adaptability or versatility
If hybrid coils with multiple windings are used for full-duplex transmission, then simultaneous bidirectional signal transmission is enabled, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention combines the functionality of multiple windings in a single transformer, simplifying the magnetic component structure. Instead of requiring complex hybrid coils with three or more windings as used in traditional telephone applications, the patent achieves full-duplex transmission through a single transformer with optimized winding configurations.
3Quantity of substance
If half-duplex operation is used for IGBT gate signaling and fault transmission, then galvanic barrier capacitance is reduced, but signal collision avoidance complexity increases
Solution Approach 1:
The patent merges gate signaling and fault transmission into a single full-duplex channel using one transformer, eliminating the need for separate half-duplex channels. This allows simultaneous transmission of both signal and fault information without requiring complex collision avoidance logic, while maintaining low galvanic barrier capacitance.
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 enables efficient, cost-effective, and simplified full-duplex digital isolation with reduced galvanic barrier capacitance, allowing for simultaneous bidirectional data transmission without signal collisions, suitable for IGBT or FET drivers.
Implementation Method 1
Two circuits are galvanically isolated and coupled through a transformer. Signals from one circuit can be transferred to the second circuit, and signals from the second circuit can be transferred to the first circuit.
Data Source
AI summary
The present invention provides a single transformer full-duplex digital isolator whereby two digital data streams may simultaneously be transmitted and received in opposite directions of propagation through a single transformer.