Single Transformer Data and Power Link for DAA Isolation
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Solution Overview
Problem
Conventional Data Access Arrangements (DAAs) require multiple isolation barriers to manage electrical isolation and power supply for subscriber equipment, leading to increased complexity and power limitations, especially when connecting to telephone networks with stringent voltage regulations.
Innovation Solution
A digital communication link using a single isolation transformer to transmit both data and power between system-side and line-side circuitry, employing a tri-state buffer and mode switch to enable power transfer while maintaining data integrity, with a communication protocol that balances flux to optimize power and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple isolation barriers are used to provide electrical isolation for each function, then electrical isolation reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple isolation barriers into a single isolation transformer that provides electrical isolation for both data transmission and power supply functions. This merging approach maintains the required electrical isolation reliability while reducing the overall device complexity by eliminating the need for separate isolation components for each function.
Solution Approach 2:
The isolation transformer is designed to perform multiple functions simultaneously: it provides electrical isolation for data signals and also serves as a power transfer medium. This multi-functionality allows a single component to replace what would traditionally require multiple separate isolation barriers, thereby reducing complexity while maintaining isolation reliability.
2Power
If power is transferred via separate power transformer with digital pulses, then power transfer capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the data transmission function and power transfer function into a single transformer component. Instead of using one transformer for data isolation and another for power transfer, the same isolation transformer handles both functions, thereby reducing the total number of transformers from two to one while maintaining adequate power transfer capability.
Solution Approach 2:
The isolation transformer is designed with universal functionality to handle both data signal transmission and power delivery. By encoding both data and power on the same transformer, the system eliminates the need for dedicated power transformer infrastructure, reducing overall device complexity.
3Device complexity
If power is derived from telephone line, then power supply simplicity is improved, but power availability is limited
Solution Approach 1:
The patent introduces the isolation transformer as an intermediary power transfer medium between the system-side circuitry and line-side circuitry. This intermediary enables efficient power transfer without directly drawing power from the telephone line, thereby overcoming the power availability limitations of telephone line power supply while maintaining a relatively simple power supply structure.
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 number of isolation barriers, minimizes power reliance on the telephone line, and maintains effective electrical isolation, enhancing efficiency and cost-effectiveness by using a single transformer for both data and power transmission.
Implementation Method 1
A single digital communication link between system-side and line-side circuitry is provided, both of which are separated by an isolation barrier including a transformer
Data Source
AI summary
The invention provides a single digital communication link between system-side and line-side circuitry in a DAA, capable both of carrying data signals and of transferring a substantial amount of power to the line-side circuitry. The invention comprises a system-side interface circuit, a line-side interface circuit, and an isolation barrier including a transformer. Each interface circuit is capable of connection to an upstream communication circuit (either line-side or system-side), from which it may receive data signals to be transmitted across the isolation barrier to the other interface circuit, and to which it may pass data signals received across the isolation barrier from the other interface circuit. The line-side interface circuit may further include a rectifier and a storage device.