Auto-resetting Span Power Protection for Telecommunications
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Solution Overview
Problem
Current protective devices in telecommunications systems, such as crowbarring solid-state surge protectors, remain activated after a power disturbance, leading to prolonged disruptions in communication links due to the inability to reset without rebooting the power supply, which is inefficient and can result in communication link outages even for brief power disturbances.
Innovation Solution
A method and power interface that deactivate protective devices by short-circuiting the output legs of the power supply for a predetermined period, allowing the devices to reset without rebooting the power supply, thereby restoring power and communication links quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crowbarring solid-state protective device is used to protect against voltage disturbances, then equipment protection is improved, but the device remains permanently shorted after activation, causing prolonged communication link outages
Solution Approach 1:
The protective device transitions from a static permanent short circuit to a dynamic resettable protection mechanism. The system automatically detects the shorted state, removes holding current to allow resetting, and restores normal operation without manual intervention, making the protection characteristic changeable over time.
Solution Approach 2:
The system performs self-diagnosis and self-resetting of the protective device. The control circuit automatically detects when the protective device is shorted, removes the holding current to enable resetting, and restores power without requiring external manual intervention, allowing the system to service itself.
2Reliability
If the power supply is rebooted to reset the protective device, then the protective device can be reset, but the remote unit loses power during the reboot process causing communication link loss
Solution Approach 1:
The system prepares for the protective device reset by first removing holding current to enable resetting, then restoring power. This preliminary preparation ensures the protective device can reset before full power is restored, preventing communication link loss during the reset process.
Solution Approach 2:
The system implements a periodic sequence of operations: detect shorted state, remove holding current, allow resetting period, then restore power. This periodic cyclic process ensures proper resetting while maintaining power continuity to the remote unit.
3Reliability
If holding current continues to flow through the protective device, then the protective device remains activated, but the protective device cannot reset itself even after the power disturbance has passed
Solution Approach 1:
The control circuit continuously monitors the state of the protective device and the holding current. When a shorted condition is detected, the system provides feedback to automatically remove the holding current, enabling the protective device to reset. This closed-loop feedback mechanism simplifies the resetting operation.
Solution Approach 2:
The system changes the electrical parameter of holding current from present to absent to enable resetting. By controlling the presence or absence of holding current, the system easily transitions the protective device between activated and reset states without complex mechanical operations.
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 rapid reset of protective devices, minimizing communication link outages and maintaining network stability by ensuring that protective devices can reset within the capacitive energy storage time of remote units, thus reducing downtime caused by power disturbances.
Implementation Method 1
when the voltage across the protective device exceeds a certain threshold (for example, due to a disturbance related to the span cable), the device becomes a short circuit, protecting the electronic devices by shunting current away from the electronic devices
Implementation Method 2
Remote units typically only maintain sufficient capacitive energy storage to ride through a loss of span power in the range of 15 to 20 milliseconds
Data Source
AI summary
Systems and methods for auto-resetting span power protection are provided. In one embodiment, a method for deactivating a protective device is provided. The method comprises determining when an overload condition occurs on a communication medium; when the overload condition occurs, deactivating at least one protective device by applying, for a first predetermined period of time, a short-circuit to an output of a power supply that provides a holding current to the at least one protective device; and after the first predetermined period of time has elapsed, removing the short-circuit on the output of the power supply.