Low-Voltage Circuit Breaker with Semiconductor Inrush Limiting
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Solution Overview
Problem
Existing electrical installations face unintentional circuit breaker trips due to high inrush currents when starting inductive or capacitive loads, requiring separate devices for specific load types, increasing installation complexity and effort.
Innovation Solution
A low-voltage protective switching device with a semiconductor circuit and control unit limits inrush currents for both capacitive and inductive loads, eliminating the need for additional devices by integrating inrush current limitation and protection functions into a single unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate devices are used for inrush current limitation for specific load types, then the inrush current can be limited effectively, but the installation complexity and effort increase
Solution Approach 1:
The patent combines the inrush current limitation function with the protective switching device into a single integrated unit. The semiconductor circuit arrangement is integrated within the protective switching device, eliminating the need for separate inrush current limiters for different load types. This merging reduces installation complexity while maintaining effective inrush current limitation.
Solution Approach 2:
The protective switching device is designed with universal applicability to handle both capacitive and inductive loads through its semiconductor circuit arrangement. The device can limit inrush currents for various load types without requiring different configurations or additional specialized devices, providing multi-functional capability in a single unit.
2Reliability
If multiple separate devices are installed for motor operation, then safe operation and uninterrupted start-up are ensured, but the installation effort increases
Solution Approach 1:
The patent merges multiple functions (protective switching, inrush current limitation, and motor operation support) into a single integrated device. The semiconductor circuit arrangement within the protective switching device eliminates the need for separate motor protection switches, circuit breakers, and starters, significantly reducing installation effort while ensuring safe operation.
Solution Approach 2:
The protective switching device provides universal protection and control for motor operations, handling both starting and normal operation phases. The device adapts to different operational requirements through its control unit that manages the semiconductor circuit arrangement, providing multi-functional capability for motor control applications.
3Reliability
If separate devices are used for different load types, then each load type can be optimized, but the flexibility of installation decreases
Solution Approach 1:
The protective switching device achieves universal applicability across different load types through its semiconductor circuit arrangement controlled by the control unit. The device can adapt its switching behavior for both capacitive and inductive loads without requiring separate specialized devices, thereby maintaining installation flexibility while providing load-specific optimization.
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 reduces installation complexity and effort by allowing safe operation of various loads with a single device, eliminating the need for separate switches and breakers, and enhancing flexibility in electrical installations.
Implementation Method 1
the control unit is designed to limit an inrush current of a downstream load, to switch the semiconductor circuit arrangement on/off in a predefinable manner when the bypass switch is open
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a low-voltage circuit breaker device (1), in particular a motor circuit breaker, having at least one outer conductor path (2) and a neutral conductor path (5), wherein a mechanical bypass switch (8) is disposed in the outer conductor path (2); a semiconductor circuit arrangement (11) of the low-voltage circuit breaker device (1) is connected in parallel with the bypass switch (8); a current measuring arrangement (12), which is connected to an electronic control unit (13) of the circuit breaker device (1), is at least provided in the outer conductor path (2); and the electronic control unit (13) is designed to control the bypass switch (8) and the semiconductor circuit arrangement (11) in a predeterminable manner. According to the invention, a control unit (13) is designed to switch the semiconductor circuit arrangement (11) on/off in a predetermined cycle when the bypass switch (8) is open so as to limit an inrush current of a downstream load (23). The invention further relates to an electric motor connecting line comprising such a low-voltage circuit breaker device (1).