Wire Power Supply Cutoff Using Temperature Difference Sensing
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Solution Overview
Problem
Existing power supply control devices require high-performance microcomputers to calculate wire temperature, leading to increased costs.
Innovation Solution
A power supply control device that includes a current output circuit, temperature difference circuit, and interruption unit to prevent wire temperature increase without calculating wire temperature, using a voltage threshold to interrupt the wire current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire temperature calculation is performed using a microcomputer, then wire temperature can be monitored to prevent abnormal temperatures, but device complexity and cost increase due to requiring high-performance microcomputers
Solution Approach 1:
The patent replaces the computational approach (microcomputer-based temperature calculation) with a direct electrical measurement approach. A temperature detection circuit measures the actual wire temperature electrically, substituting the need for complex mathematical calculations and high-performance microcomputers with a simpler electrical sensing system that directly outputs temperature data.
2Reliability
If wire temperature calculation is performed using a microcomputer, then wire temperature can be monitored to prevent abnormal temperatures, but manufacturing cost increases due to expensive microcomputer requirements
Solution Approach 1:
The patent replaces the computational approach (microcomputer-based temperature calculation) with a direct electrical measurement approach. A temperature detection circuit measures the actual wire temperature electrically, substituting the need for complex mathematical calculations and high-performance microcomputers with a simpler electrical sensing system that directly outputs temperature data.
Solution Approach 2:
The patent employs a cost-effective temperature detection circuit that uses inexpensive electrical components rather than expensive microcomputers. This approach uses simple, cheap electrical elements to achieve the temperature monitoring function, significantly reducing manufacturing costs while maintaining reliability.
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
Prevents wire temperature from rising to abnormal levels without the need for wire temperature calculations, reducing the necessity for high-performance microcomputers and maintaining safe operating conditions.
Implementation Method 1
a temperature difference circuit to which the current output by the current output circuit is input, and which is configured to output a voltage that is higher the larger a temperature difference between a wire temperature of the wire and an ambient temperature in the surroundings of the wire is
Data Source
AI summary
A power supply control device controls power supply through a wire. A first current output circuit is configured to output, to a temperature difference circuit, a current that is larger the larger a wire current, which flows through the wire is. The temperature difference circuit is configured to output a voltage that is higher the larger a temperature difference between a wire temperature of the wire and an ambient temperature in the surroundings of the wire is. A drive circuit is configured to interrupt a flow of the wire current if the output voltage of the temperature difference circuit is at least a voltage threshold.