Electronic Arc Extinguishing Device Using Silicon Controlled Rectifiers
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Solution Overview
Problem
Conventional electronic switches with a bridge structure suffer from short electrical life due to arc generation during on/off cycles, requiring frequent maintenance and replacement, which is labor-intensive, time-consuming, and costly.
Innovation Solution
An electronic switch structure incorporating two fixed contacts, a contact bridge, rectifying elements, current limiting elements, and silicon controlled rectifiers connected in inverse parallel, with a voltage stabilizer and protector, to manage voltage and current effectively and extinguish arcs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bridge structure is used in electronic switches to enhance arc interruption capability, then the arc interruption capability is improved, but the electrical life is reduced due to contact burning
Solution Approach 1:
The patent extracts the arc extinguishing function from the main current path by introducing a parallel arc extinguishing circuit with silicon controlled rectifiers. This separate circuit path allows arcs to be extinguished without affecting the main contacts, thereby extending their electrical life while maintaining arc interruption capability
Solution Approach 2:
The patent introduces silicon controlled rectifiers as intermediary components in a parallel circuit that act as mediators to divert and extinguish arcs. These intermediaries handle the arc extinction function, protecting the main contacts from burning and extending their service life
2Device complexity
If conventional electronic switches are used with exposed electrical contacts, then the structure is simple, but the contacts are easily burnt out due to large arcs
Solution Approach 1:
The patent segments the switch structure into two functional parts: the main switch with exposed contacts for simple operation, and a separate parallel arc extinguishing circuit for contact protection. This segmentation allows the main structure to remain simple while adding protective functionality
Solution Approach 2:
The patent creates a protected environment for the electrical contacts by introducing a parallel circuit with silicon controlled rectifiers that generate controlled arcs to extinguish harmful arcs. This creates a protective mechanism that shields the contacts from direct exposure to damaging arc 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
The solution extends the electrical life of the switch by more than ten times, reducing maintenance costs and failure rates, while maintaining a simple structure and small volume with high reliability.
Implementation Method 1
an electronic arc extinguishing device having a simple structure, a small volume, and high reliability
Implementation Method 2
The two rectifying elements are used to generate a voltage drop to realize a rectification effect
Implementation Method 3
The two current limiting elements are used to limit a current to a unidirectional flow
Data Source
AI summary
An electronic switch structure capable of extinguishing arcs is provided. A device capable of extinguishing arcs generated when an electric switch is turned on or off is in a following structure. Two silicon controlled rectifiers are connected in inverse parallel. Trigger ports of the silicon controlled rectifiers are connected to triggering current limiting circuits each formed by a diode and a resistor connected in series, respectively. Positive poles and negative poles of the silicon controlled rectifiers are connected to a voltage dependent resistor and a resistance-capacitance absorption circuit for over voltage protection in parallel. A triggering end of the device is connected to a contact bridge of the switch. Two ends connected in inverse parallel of the silicon controlled rectifiers are connected to two ends of fixed contacts of the switch respectively. Thus, an electronic arc extinguishing device having a simple structure, a small volume, and high reliability is formed.