Shared Protection Device for Multiple Variable Batteries
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Solution Overview
Problem
The existing multiple-protector protection scheme for subscriber line interface circuits (SLICs) is costly due to the need for separate protectors and gate capacitors for each channel, especially when multiple battery voltages are used, as in dual-channel cable modems, to handle voltage excursions like lightning surges.
Innovation Solution
A shared protection device is employed that dynamically senses the most negative voltage among multiple SLICs and provides overvoltage protection by grounding the interface lines when voltages exceed the sensed reference, using a single protection element and gate capacitor, reducing the number of protection devices and associated components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate protectors are used for each channel with multiple battery voltages, then overvoltage protection is provided for each channel, but the cost and device complexity increase significantly
Solution Approach 1:
The patent combines multiple protection functions into a single shared protection device that can protect multiple subscriber line interface circuits simultaneously. Instead of having separate protectors for each channel, one protection device monitors multiple battery voltages and provides protection for all channels, thereby reducing the number of protection components while maintaining comprehensive protection coverage.
Solution Approach 2:
The shared protection device is designed to perform multiple protection functions simultaneously. It can monitor different battery voltages (VBL1, VBL2, etc.) and provide overvoltage protection for multiple channels through a single device, making the protection system universal and applicable to various channel configurations without requiring channel-specific protectors.
2Reliability
If separate protectors are used for each channel, then each channel receives dedicated protection, but the number of protection devices and gate capacitors increases
Solution Approach 1:
The patent merges the protection functions of multiple separate protectors into a single shared protection device. This single device replaces what would otherwise be multiple individual protectors and their associated gate capacitors, significantly reducing the total quantity of protection components while maintaining the ability to protect all channels effectively.
3Reliability
If multiple protectors are employed for different battery voltages, then voltage-specific protection is achieved, but the cost increases
Solution Approach 1:
The shared protection device is designed as a universal protection solution that can handle multiple different battery voltages (VBL1, VBL2, and potentially more) through a single device. This eliminates the need to manufacture and stock multiple different protector types for different voltage levels, reducing manufacturing complexity and cost while maintaining voltage-specific protection capabilities.
Data Source
AI summary
A device includes a plurality of subscriber line interface circuits and a shared protection device. Each subscriber line interface circuit has a voltage input terminal and first and second interface line terminals. The shared protection device is coupled to the interface line terminals and operable to sense a negative reference voltage representing a most negative one of the voltages present on the voltage input terminals and to provide overvoltage protection responsive to a voltage on at least one of the interface line terminals exceeding the negative reference voltage.