Power Line Cutoff Control Using Current and Voltage Detection
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Solution Overview
Problem
Existing cutoff control devices erroneously determine power line cutoff due to noise interference, lacking a comprehensive approach to differentiate between current and voltage changes accurately.
Innovation Solution
A cutoff control device that includes current and voltage detection units to determine a predetermined current increase state and voltage decrease state before initiating a cutoff, using thresholds adjusted by internal resistance and line resistance to prevent erroneous cutoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If only current detection is used to determine cutoff, then the response speed is fast, but noise may cause erroneous determination
Solution Approach 1:
The patent combines current detection and voltage detection into a unified determination system. The control unit simultaneously monitors both current values and voltage values, and only determines a short-circuit fault when both conditions are satisfied (current exceeds threshold AND voltage drops below threshold), thereby preventing erroneous determination from noise while maintaining fast response.
Solution Approach 2:
The system continuously monitors both current and voltage parameters and uses feedback from both sensors to make the cutoff determination. By incorporating voltage feedback alongside current feedback, the system verifies actual short-circuit conditions before triggering cutoff, eliminating false positives from noise interference.
2Reliability
If both current and voltage detection are used, then determination accuracy is improved, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it controls the cutoff unit, detects current through the current detection unit, detects voltage through the voltage detection unit, and makes determination based on both parameters. This multi-functional design avoids adding separate dedicated components for each function, thereby limiting the increase in device complexity while achieving accurate determination.
3Measurement precision
If threshold values are adjusted based on internal resistance and line resistance, then measurement precision is improved, but calculation complexity increases
Solution Approach 1:
The control unit pre-stores the internal resistance value and line resistance value in its memory. By performing the action of storing these resistance values in advance, the system avoids complex real-time calculations during fault determination, simplifying the operational complexity while maintaining precise threshold adjustment capability when faults occur.
Data Source
AI summary
A cutoff control device controls a cutoff unit. An in-vehicle system includes a power storage unit, a power line for power transmission between the power storage unit and a load, and a cutoff unit to switch between allowing and cutting off power supply from the power storage unit to the load through the power line. The cutoff control device includes a current detection unit, a voltage detection unit, and a control unit. The current detection unit detects the current flowing through the power line. The voltage detection unit detects the voltage in the power line. The control unit instructs the cutoff unit to cut off power if the current detection unit detects a predetermined current increase and the voltage detection unit detects a predetermined voltage decrease.