Surge Protection Device with Arrestor Assistor for Telecommunication
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Solution Overview
Problem
Existing single-stage surge protection devices (SPDs) for telecommunication equipment face challenges in miniaturization due to the use of inductors, leading to increased dimensions and weight, and have variable breakdown voltages that can result in load voltage exceeding the limit during steep voltage impulses, causing potential damage.
Innovation Solution
A simply-structured single-stage SPD comprising a surge arrestor and an arrestor assistor, where the arrestor assistor includes a transient voltage suppressor diode and a semiconductor switch to control the load voltage, ensuring it does not exceed the limit, eliminating the risk of impulse breakdown and allowing for direct control without external communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single-stage SPD is used to reduce dimension, then the SPD size is reduced, but the breakdown voltage becomes variable and may exceed the load voltage limit during steep voltage impulses
Solution Approach 1:
The patent introduces an arrestor assistor circuit as an intermediary component between the surge arrestor and the load. This assistor circuit, comprising a TVS diode and semiconductor switch, mediates the voltage control function to ensure the load voltage remains below the voltage limit during impulse conditions, while the surge arrestor handles the primary surge protection function.
Solution Approach 2:
The patent segments the surge protection function into two distinct parts: the surge arrestor responsible for clamping voltage during surges, and the arrestor assistor (TVS diode + semiconductor switch) responsible for controlling the breakdown voltage timing. This segmentation allows each component to specialize in one aspect, improving overall reliability while maintaining compact size.
2Reliability
If multi-stage SPD with serial inductor is used to ensure protection effectiveness, then the protection reliability is improved, but the SPD dimension and weight increase significantly
Solution Approach 1:
The patent extracts and removes the serial inductor component from the traditional multi-stage SPD configuration. By eliminating the inductor, the patent achieves significant reduction in SPD dimension and weight while maintaining protection effectiveness through the alternative architecture of surge arrestor combined with arrestor assistor.
Solution Approach 2:
The patent replaces the traditional inductor-based magnetic field approach with an electronic control approach using TVS diode and semiconductor switch. This substitution eliminates the need for large magnetic components, enabling compact SPD design while maintaining protection reliability.
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
The proposed SPD effectively clamps the load voltage within the limit, preventing damage from steep voltage impulses and accommodating higher peak lightning strike currents, while being compact and reliable, suitable for modern telecommunication equipment with mechanical dimension constraints.
Implementation Method 1
The TVS diode prevents the load voltage from exceeding the clamping voltage and thus suppresses the rising rate of the load voltage when the load voltage rises to the reverse breakdown voltage
Implementation Method 2
the surge arrestor is arranged within a circuit branch connected in parallel with a load and adapted to clamp a load voltage to a clamping voltage not larger than a load voltage limit when the load voltage rises to a breakdown voltage of the surge arrestor
Data Source
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AI summary
The present disclosure provides a surge protection device comprising a surge arrestor and an arrestor assistor. The surge arrestor is arranged within a circuit branch connected in parallel with a load and adapted to clamp a load voltage to a clamping voltage not larger than a load voltage limit when the load voltage rises to a breakdown voltage of the surge arrestor, the breakdown voltage increasing with a rising rate of the load voltage. The arrestor assistor is connected in parallel with the surge arrestor within the circuit branch and adapted to make the load voltage rise to the breakdown voltage not larger than the load voltage limit. The present disclosure also provides a telecommunication equipment comprising the surge protection device.