Thermally Activated Surge Protector Circuit Topology
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Solution Overview
Problem
Conventional surge protectors face challenges in effectively managing power surges, as energy-absorbing elements like metal oxide varistors can become overheated, leading to potential fires and damage, and existing designs lack efficient mechanisms to transition between fail open and fail short configurations to prevent prolonged exposure to unsafe voltage conditions.
Innovation Solution
The surge protector incorporates a thermally activated switching mechanism, utilizing a thermal bulb or thermal disconnect that changes state based on temperature, triggering a connection unit to switch between positions, either opening the circuit to prevent overheating or creating a short circuit to interrupt power, thereby protecting electrical components from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the energy absorbing element continuously absorbs surge energy, then protection effectiveness is improved, but overheating and fire risk increase
Solution Approach 1:
The patent changes the physical state parameter of the thermal spacing unit (from solid to liquid to gas) in response to temperature changes. When the energy absorbing element overheats, the thermal spacing unit undergoes phase transition, automatically adjusting the spacing between contacts to interrupt the circuit and prevent fire, thus resolving the contradiction between continuous protection and overheating prevention.
2Reliability
If the surge protector maintains a stable circuit configuration, then operational reliability is improved, but inability to respond to surge conditions worsens
Solution Approach 1:
The patent introduces dynamic adaptability through the thermal spacing unit that automatically adjusts the circuit configuration based on temperature conditions. The unit transitions between different physical states to dynamically change the spacing between first and second contacts, enabling the surge protector to adapt between stable operation and surge response modes, thus resolving the contradiction between operational reliability and adaptability to surge conditions.
3Speed
If the thermal spacing unit responds rapidly to temperature changes, then surge protection speed is improved, but false triggering from normal operation increases
Solution Approach 1:
The patent utilizes phase transitions of the thermal spacing unit material as the response mechanism. The material is selected to undergo phase transition only at temperatures exceeding normal operational ranges, ensuring rapid response to genuine surges while avoiding false triggering. The phase transition provides a clear threshold-based response that distinguishes between normal heating and dangerous overheating conditions.
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 design effectively prevents overheating and damage by reliably switching between fail open and fail short configurations, ensuring safe operation and reducing the risk of component damage during power surges, while also preventing prolonged exposure to unsafe voltage conditions.
Implementation Method 1
an energy absorbing element configured to absorb energy and release absorbed energy as heat
Implementation Method 2
a thermal spacing unit contacting the energy absorbing element, the thermal spacing unit configured to be in a first physical state or a second physical state based on a temperature of the energy absorbing element
Data Source
AI summary
A surge protector includes a first and second contact connected via an energy absorbing element, such that electrical current travels from the first contact to the second contact via the energy absorbing element. The surge protector further includes a thermal spacing unit contacting the energy absorbing element and configured to be in a first physical state or a second physical state based on a temperature of the energy absorbing element. The surge protector further includes a connection unit connected to the second contact, the connection unit configured to be in a first position when the thermal spacing unit is in a first physical state and a second position when the thermal spacing unit is in a second physical state, such that the electrical current from the first contact to the second contact via the energy absorbing element is interrupted when the connection unit is in the second position.