Low-Voltage Circuit Breaker Threshold Control for Semiconductor Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing circuit breaker devices for low-voltage circuits struggle to reliably prevent overcurrent and short circuits without overdimensioning semiconductor-based switching elements, leading to potential thermal destruction.
Innovation Solution
A circuit breaker device with a mechanical isolating contact unit and an electronic interruption unit, utilizing a control unit to adjust current threshold values based on voltage levels, ensuring the electronic interruption unit switches to a high-impedance state when current thresholds are exceeded, protecting semiconductor-based switching elements from thermal overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If semiconductor-based switching elements are used in the electronic interruption unit, then the circuit breaker can rapidly interrupt current flow, but the semiconductor components are vulnerable to thermal destruction from excessive current
Solution Approach 1:
The patent applies dynamics by making the current threshold adjustable based on voltage levels. The control unit dynamically adapts the current threshold value according to the detected voltage, allowing the circuit breaker to respond appropriately to different operating conditions. This dynamic adjustment protects semiconductor components by preventing thermal overload while maintaining rapid interruption capability.
Solution Approach 2:
The patent changes the parameter of current threshold based on voltage levels. The control unit detects voltage and adjusts the current threshold accordingly - using lower thresholds at lower voltages to prevent thermal destruction of semiconductor components, and higher thresholds at higher voltages to allow legitimate high-current operation. This parameter change resolves the contradiction between rapid interruption and component protection.
2Device complexity
If fixed current threshold values are used for overcurrent protection, then the control logic is simple, but the semiconductor components may be overloaded under varying voltage conditions
Solution Approach 1:
The patent changes the current threshold parameter based on detected voltage levels. The control unit adjusts the threshold dynamically - using lower thresholds when voltage is low to protect semiconductor components from thermal overload, and higher thresholds when voltage is high to permit legitimate high-current operation. This resolves the contradiction between simple control logic and reliable component protection.
Solution Approach 2:
The patent implements feedback by having the control unit detect voltage levels and use this information to adjust the current threshold. The system continuously monitors voltage and adapts the protection threshold accordingly, creating a closed-loop control system that protects semiconductor components while maintaining operational flexibility.
3Reliability
If the current threshold is lowered to protect semiconductor components, then thermal overload is prevented, but legitimate high-current operation at high voltage may be restricted
Solution Approach 1:
The patent changes the current threshold parameter based on voltage levels to resolve this contradiction. At low voltage, the threshold is lowered to protect semiconductor components from thermal overload. At high voltage, the threshold is raised to allow legitimate high-current operation. This dynamic parameter adjustment maintains both component protection and operational versatility across different operating 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 allows for efficient and reliable prevention of overcurrents and short circuits, protecting semiconductor components by adjusting current thresholds based on voltage levels, thereby enhancing the device's efficiency and economic benefits.
Implementation Method 1
the electronic interruption unit can be switched by semiconductor-based switching elements to a high-impedance state of the switching elements in order to prevent a flow of current
Implementation Method 2
the mechanical isolating contact unit can be switched by opening contacts in order to prevent a flow of current
Implementation Method 3
protecting semiconductor-based switching elements from thermal overload
Data Source
AI summary
A circuit breaker device for a low-voltage circuit has a mechanical isolating contact unit connected in series with an electronic disconnection unit. The mechanical isolating contact unit is switched by opening contacts to prevent current flow or closing the contacts for current flow in the low-voltage circuit. The electronic disconnection circuit is switched by semiconductor-based switching elements into a high-resistance state of the switching elements or into a low-resistance state of the switching elements for current flow in the low-voltage circuit. When the amount of an instantaneous current value of the low-voltage circuit exceeds at least one current threshold value, prevention of the current flow of the low-voltage circuit is initiated. The at least one current threshold value is adjusted according to the magnitude of the voltage of the circuit breaker device.