Parallel Load Power Circuit for Faulty Switch Identification
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Solution Overview
Problem
Existing power supply circuits fail to efficiently identify which switch among multiple loads has an abnormality, leading to increased time for repairs in distribution boards where loads are connected in parallel.
Innovation Solution
A power supply circuit design that includes a power circuit, a precharge circuit, a load circuit, a potential difference acquisition unit, a switch operation unit, and an abnormality determination unit, which acquires and analyzes the time change of potential differences to determine switch abnormalities by sequentially switching the load switches from OFF to ON.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple loads are connected in parallel to a common power source with individual switches, then the power supply circuit can serve multiple loads, but it becomes difficult to identify which switch has an abnormality
Solution Approach 1:
The system uses a potential difference acquisition unit to continuously monitor voltage differences and provides feedback to the abnormality determination unit. When a switch abnormality occurs, the change in potential difference is detected and fed back to identify the specific faulty switch, resolving the difficulty of detecting which switch is abnormal while maintaining the ability to serve multiple loads.
Solution Approach 2:
The potential difference acquisition unit acts as an intermediary between the switch operations and the abnormality determination unit. It measures the potential difference caused by switch operations and transmits this information to the abnormality determination unit, enabling indirect detection of switch abnormalities without direct intervention in the power circuit.
2Device complexity
If no abnormality detection system is provided, then the device complexity is low, but the repair time increases significantly
Solution Approach 1:
The system enables self-diagnosis of switch abnormalities through automated potential difference measurement and analysis. The abnormality determination unit automatically identifies faulty switches based on potential difference changes, eliminating the need for manual inspection and significantly reducing repair time while adding only minimal circuit components.
Solution Approach 2:
The system performs preliminary detection of switch abnormalities before they cause complete system failure. By continuously monitoring potential differences and identifying switches that are stuck in ON or OFF states, the system enables early intervention and faster repair, reducing overall downtime while maintaining circuit simplicity.
3Ease of operation
If manual inspection of each switch is performed to identify abnormalities, then the detection method is simple, but the time required for identification increases
Solution Approach 1:
The system replaces manual mechanical inspection of switches with an automated electrical measurement system. The potential difference acquisition unit automatically measures voltage differences and the abnormality determination unit processes this data to identify faulty switches, substituting manual operations with automated electronic detection that is both simple to operate and highly efficient.
Solution Approach 2:
The system detects switch abnormalities by monitoring changes in potential difference parameters. When switches are operated or when abnormalities occur, the potential difference changes in characteristic ways that the abnormality determination unit can identify, enabling rapid detection without manual inspection while maintaining operational simplicity.
Data Source
AI summary
In a power supply circuit in which a plurality of loads are connected in parallel to a common power source and load switches are provided for the respective loads, an abnormality determination unit determines which load switch has an abnormality among the plurality of load switches, based on time change of a potential difference acquired after a switch operation unit switches each load switch from OFF to ON.