Switching Assembly State Verification via Auxiliary Voltage
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Solution Overview
Problem
Existing electrical devices with series-connected switching elements, such as relays, face challenges in reliably and safely checking the state of these elements, particularly in ensuring they are not stuck or pinched, which can lead to incorrect power supply to loads and safety hazards.
Innovation Solution
A switching arrangement that includes a safety switching element and a working switching element in series with an electrical load, featuring an auxiliary switching element for applying a reduced auxiliary voltage to determine the state of the working switching element using measurement paths and a computing unit to analyze voltage data, thereby ensuring the working switching element's correct operation and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a working switching element is used to control power supply to a load, then the load can be switched on and off, but the switching element may become stuck or pinched leading to safety hazards
Solution Approach 1:
The patent applies preliminary action by performing a state check of the working switching element before the load is switched on. The control unit determines whether the switching element is stuck or pinched in advance, preventing unsafe operation. This is achieved by applying test voltage through the safety switching element and measuring the resulting current to detect abnormal states before actual power supply begins.
Solution Approach 2:
The patent introduces a safety switching element as an intermediary between the power source and the load. This intermediate component allows for safe state verification of the working switching element without directly exposing the load or operator to hazardous voltage levels during the checking process.
2Reliability
If a safety switching element is added in series to ensure safe operation, then safety is improved, but the device complexity increases
Solution Approach 1:
The safety switching element serves multiple functions: it acts as a safety barrier during normal operation, enables state verification of the working switching element during testing, and protects the control unit from hazardous voltage levels. This multi-functionality justifies the added component by providing both safety and diagnostic capabilities.
Solution Approach 2:
The working switching element is tested using its own operational characteristics (electrical conductivity) without requiring external specialized testing equipment. The control unit uses the existing circuit configuration and components to perform self-diagnosis, eliminating the need for additional complex testing apparatus.
3Reliability
If a state check of the working switching element is performed before load operation, then reliability is improved, but the checking process becomes complex due to hazardous voltage levels
Solution Approach 1:
The patent creates a safe measurement condition by ensuring that during the state checking process, the voltage levels present are non-hazardous. The control unit is designed to operate at safe voltage levels while still being able to detect the state of the working switching element through current measurement in the test circuit, eliminating the need for complex high-voltage measurement systems.
Data Source
Figure 1~2
AI summary
A switching arrangement (200) for an electrical device is described, wherein the electrical device has a load (103) which can be coupled to a power supply via a series connection of a safety switching element (101) and a working switching element (102). The switching arrangement (200) comprises an auxiliary switching element (122) configured to couple one side of the working switching element (102) to an auxiliary voltage (121). The switching arrangement (200) also comprises a first measurement path (123) configured to couple one side of the working switching element (102) to a first measurement input (211) of a processing unit, and a second measurement path (124) configured to couple a second side of the working switching element (102) to a second measurement input (212) of the processing unit.Furthermore, the switching arrangement (200) includes the processing unit, which is configured to cause the auxiliary switching element (122) to couple one side of the working switching element (102) with the auxiliary voltage (121). The processing unit is also configured to acquire initial measurement data at the first measurement input (211) and subsequent measurement data at the second measurement input (212). In addition, the processing unit is configured to determine a state of the working switching element (102) based on the initial measurement data and based on the subsequent measurement data.