Current Feedback Electronic Arc Extinguishing Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic arc extinguishing apparatuses for mechanical switches suffer from long switch-on times and poor reliability due to uncertain delay periods in arc extinguishment, leading to unnecessary workload and potential burning of contacts.
Innovation Solution
A current feedback-type electronic arc extinguishing apparatus is designed with a power semiconductor device connected in parallel to a mechanical switch, utilizing a current sensor and control circuit to detect switch-off and immediately cut off the power semiconductor device, ensuring fast and reliable arc extinguishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thyristor is switched on for a relatively long period to ensure reliable arc extinguishment after mechanical switch break, then arc extinguishment reliability is improved, but switch-on work time increases causing poor overload capacity and low reliability
Solution Approach 1:
The patent employs a current sensor to detect the current flowing through the mechanical switch and provides feedback to the control circuit. When the current drops below a threshold (indicating switch break), the control circuit immediately triggers the power semiconductor device to cut off, eliminating the need for long delay periods and achieving both fast response and reliable arc extinguishment.
Solution Approach 2:
The patent replaces the mechanical delay mechanism (uncertain delay from control coil losing power to mechanical switch breaking) with an electronic detection and control system. The current sensor and control circuit provide precise, immediate detection and response, substituting mechanical inertia and uncertainty with electronic speed and precision.
2Object-generated harmful factors
If delayed time control signal is used to cut off the thyristor after mechanical switch breaks, then arc extinguishment is achieved, but unnecessary redundant switch-on work time is increased
Solution Approach 1:
The current sensor continuously monitors the load current and provides real-time feedback to the control circuit. When the mechanical switch breaks and current drops below the threshold, the control circuit immediately generates a cut-off signal, eliminating redundant switch-on time while ensuring complete arc extinguishment.
Solution Approach 2:
The control circuit is prepared in advance with the power semiconductor device in a ready state. Upon detecting switch break through current feedback, the cut-off action is immediately executed without delay, performing the arc extinguishment function at the precise moment needed without unnecessary preceding or following operations.
3Device complexity
If common arc chute is used for arc extinguishment, then simple structure is maintained, but arc extinguishing effect is poor when load breaks and arc is great
Solution Approach 1:
The patent introduces a power semiconductor device as an intermediary between the mechanical switch and the arc chute. This electronic component actively controls the current flow and works in conjunction with the simple arc chute structure to achieve reliable arc extinguishment even under high arc conditions, maintaining structural simplicity while dramatically improving performance.
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 achieves a short switch-on time for the power semiconductor device, enhancing reliability and reducing the risk of contact burning by allowing the apparatus to handle high currents efficiently with minimal workload, thereby improving the overall arc extinguishing process.
Implementation Method 1
a main loop of the power semiconductor device is connected to a current sensor so as to detect switch-off of the mechanical switch
Data Source
AI summary
The invention relates to a current-feedback electronic arc-extinguishing apparatus suitable for implementing arc extinguishing on a mechanical switch. The current-feedback electronic arc-extinguishing apparatus includes a power semiconductor device which is connected to a mechanical switch in parallel, and a power supply circuit, where a main loop of the power semiconductor device is connected to a current sensor for detecting whether the mechanical switch is switched off; an output signal of the current sensor is connected to a control circuit, and a control port of the power semiconductor device is connected to the control circuit; the power supply circuit is connected to the control circuit, and the power supply circuit supplies power to the control circuit; and when the current sensor detects that the mechanical switch is switched off, the control circuit controls the power semiconductor device to cut off.