Surge Protection Device With External Semiconductor Switch
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Solution Overview
Problem
Existing overvoltage protection devices for arresters, particularly in direct current applications, face challenges with arc extinguishing and increased costs due to mechanical switching issues, which can prevent immediate disconnection during high temperatures and are costly for advanced switching capabilities.
Innovation Solution
An overvoltage protection device with a sensor and external switching device that uses electrical signals to disconnect the arrester, utilizing a measuring bridge or thermal sensors, and a DC load or semiconductor switch for purely electrical triggering, allowing for cost-effective and reliable operation in DC systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical switching element is used to disconnect the arrester, then the arrester can be disconnected from the network, but an arc forms on the switching element which can cause further damage and is difficult to control
Solution Approach 1:
The patent replaces the mechanical switching element with a semiconductor-based switching device that is triggered by an electrical signal from the sensor. This substitution eliminates the mechanical contact points that generate arcs, thereby removing the source of arc damage while maintaining the disconnection function. The semiconductor switch operates without mechanical contact, preventing arc formation entirely.
Solution Approach 2:
The patent introduces an electrical signal as an intermediary between the temperature sensor and the switching device. The sensor detects temperature and generates an electrical switch-off signal that triggers the semiconductor switch. This intermediary signal transmission method avoids direct mechanical contact and arc generation while achieving the desired disconnection effect.
2Ease of operation
If mechanical switching capabilities are enhanced to improve disconnection performance, then the switching capability increases, but the device becomes considerably more expensive
Solution Approach 1:
The patent replaces complex mechanical switching mechanisms with a simpler semiconductor-based switching device controlled by an electrical signal. This substitution reduces device complexity and cost while maintaining or improving switching capability. The semiconductor switch requires no mechanical actuation mechanisms, reducing overall system complexity.
Solution Approach 2:
The temperature sensor automatically detects temperature increase and generates the switch-off signal without external intervention. The system serves itself by using the sensor's electrical output to directly trigger the switching device, eliminating the need for complex external control mechanisms and reducing overall system complexity and cost.
3Reliability
If a mechanical switch-off process is used, then the arrester can be disconnected, but the process is not suitable for direct current applications where no zero crossing exists for arc extinguishing
Solution Approach 1:
The patent replaces the mechanical switch-off process with a semiconductor-based switching device that can operate in direct current applications. The semiconductor switch, triggered by an electrical signal, can interrupt DC current without relying on zero crossing, making the system adaptable to both AC and DC applications including photovoltaic systems.
Solution Approach 2:
The patent changes the fundamental operating parameter of the switching mechanism from mechanical contact (requiring zero crossing for arc extinction in AC) to semiconductor-based electrical control. This parameter change enables the switching device to operate effectively in DC applications where no zero crossing exists, significantly improving adaptability.
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 solution ensures stable and cost-effective arc extinguishing in direct current applications, enabling immediate disconnection and reducing costs by using existing switching elements, while maintaining reliability and safety in photovoltaic systems.
Implementation Method 1
sensors based on melting solders are usually used... sensor 2, with sensor 2 generating an electrical switch-off signal 4
Implementation Method 2
A switching device 3 that is external relative to the arrester 1 receives the electrical switch-off signal 4 and then disconnects the arrester 1 from a circuit
Implementation Method 3
the arrester 1, the arrester 1 being intended to divert an overvoltage or a surge current, for example to ground, i.e. to create a balance between different potentials
Data Source
Figure 1
AI summary
The invention relates to a surge protection device (5). The surge protection device (5) has an arrester (1). The arrester (1) should produce an equalization between different potentials and arrest a surge current during use. A sensor (2) is provided on the arrester (1), said sensor (2) generating an electric switch-off signal (4). A switching device (3) receives the switch-off signal (4) and separates the arrester (1) from an electric circuit, said switching device (3) and arrester (1) being arranged in a physically separate manner from each other.