Cable Network Power Unit for Fast Surge Protector Reset
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Solution Overview
Problem
Existing surge protectors in active devices of cable networks powered by switched DC signals struggle to reset quickly due to the need to wait for zero voltage crossings, leading to prolonged network interruptions during power surges.
Innovation Solution
A cable network power unit with a polarity switching module and controller that responds to abrupt current changes to reset surge protectors by switching DC signal polarity, using a current measuring device and comparator to determine when to trigger polarity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DC power signal polarity is switched periodically at low frequency (5 to 0.2 Hz) to reduce power consumption, then power efficiency is improved, but surge protector reset time increases to almost 1 second or 100 ms
Solution Approach 1:
The system uses current measurement means to detect abrupt changes in current that indicate surge protector triggering, and feeds this information back to the controller. The controller then responds by switching the DC power signal polarity immediately, rather than waiting for the next scheduled switching time. This feedback mechanism enables the system to maintain low power consumption through infrequent scheduled switching while achieving rapid surge protector reset when needed.
Solution Approach 2:
The system performs preliminary action by continuously monitoring current for signs of surge protector triggering and being ready to switch polarity immediately when detected. The current measuring means and controller are prepared in advance to detect and respond to surge events, allowing the system to reset surge protectors rapidly without having to wait for the next scheduled polarity switching time.
2Loss of time
If DC power switching frequency is increased to reduce surge protector reset delay, then surge protector reset time is improved, but power consumption increases
Solution Approach 1:
The feedback mechanism allows the system to maintain low power consumption by using infrequent scheduled polarity switching (5 to 0.2 Hz) while achieving rapid surge protector reset when needed. The current measurement and control system detects surge events and triggers immediate polarity switching only when necessary, avoiding continuous high-frequency switching and its associated power consumption.
Solution Approach 2:
The system dynamically adjusts the polarity switching frequency based on network conditions. During normal operation, polarity switching occurs at low frequency (5 to 0.2 Hz) to minimize power consumption. When a surge event is detected through current measurement, the system dynamically increases the switching frequency by immediately triggering a polarity switch, thus achieving rapid surge protector reset only when required.
3Reliability
If surge protectors wait for zero voltage crossing to reset in switched DC network, then surge protector reliability is improved, but network availability deteriorates during surge events
Solution Approach 1:
The current measurement means provides feedback about surge protector status, enabling the controller to detect when a surge protector has triggered. Upon detection, the controller immediately switches the DC power signal polarity, forcing the surge protector to reset without waiting for the next scheduled switching time. This maintains surge protector reliability while minimizing network unavailability during and after surge events.
Solution Approach 2:
The system prepares for rapid surge protector reset by continuously monitoring current and being ready to switch polarity immediately when a surge event is detected. This preliminary monitoring and readiness ensure that surge protectors can reset rapidly (within 1 to 5 ms) while maintaining their reliability through controlled polarity switching.
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
Enables rapid reset of surge protectors within 1 to 5 ms, minimizing network downtime and ensuring communication continuity during power surges.
Implementation Method 1
The current measurement means may derive a value related to the current by measuring voltage across a resistive element
Implementation Method 2
the controller is responsive to abrupt changes in current to trigger the polarity switching module to switch polarity of the DC signal
Data Source
AI summary
There is provided a cable network power unit (22) configured to generate a DC power signal periodically switching between a positive and negative voltage, the power unit (22) comprising a polarity switching module (66), current measuring device (60), and a controller (64), wherein the controller (64) is responsive to abrupt changes in current to trigger the polarity switching module (66) to switch polarity of the DC power signal, and thereby reset surge protectors in active devices such as nodes or amplifiers if they have triggered due to a power surge, for example from a lightning strike.