Automotive Harness Terminal Assembly for PPTC Trip Time Control
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Solution Overview
Problem
Existing circuit protection devices in automotive harnesses, such as PPTC devices, lack the ability to precisely control the trip time, leading to potential issues of tripping too rapidly or too sluggishly in response to faults.
Innovation Solution
A terminal assembly for automobile harnesses is designed with a modified terminal structure and a resettable fuse component made of PPTC material, which is coupled in series with the wiring assembly. The terminal design and wiring configuration are tailored to control the trip time of the PPTC device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PPTC device is used for harness protection, then the device provides automatic resettable protection against short circuits, but the trip time cannot be precisely controlled and may trip too rapidly or too sluggishly
Solution Approach 1:
The patent applies parameter changes by modifying the terminal structure (from conventional to plate structure extending perpendicularly from substrate) and adjusting wiring assembly configurations to control thermal transfer characteristics. These parameter changes enable precise control of the PPTC device trip time while maintaining reliable circuit protection, resolving the contradiction between protection reliability and trip time control.
2Speed
If the PPTC device trips too rapidly, then fault protection is achieved quickly, but normal operation may be interrupted unnecessarily; if it trips too sluggishly, then normal operation is maintained longer, but fault damage increases
Solution Approach 1:
The patent implements feedback control through the modified terminal and wiring assembly configuration that regulates thermal transfer to the PPTC device. This feedback mechanism ensures the PPTC device trips at the appropriate time by controlling the thermal response, achieving both rapid fault detection and accurate protection timing without unnecessary interruptions or delayed responses.
3Loss of time
If the terminal structure is modified to control trip time, then precise trip time control is achieved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a modified terminal structure with plate elements that extend perpendicularly from the substrate, which serves multiple functions: electrical connection, mechanical support, and thermal management for trip time control. This multi-functional design achieves precise trip time control without proportionally increasing device complexity, as the same structural elements perform multiple roles.
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
The proposed terminal assembly effectively tailors the trip time of the PPTC device, ensuring it trips within specified limits across various current levels, thereby enhancing the reliability of circuit protection in automotive harnesses.
Implementation Method 1
polymer positive temperature coefficient (PPTC) device, that may act as resettable fuses. When a fault occurs that drives the temperature beyond a certain trip temperature of the PPTC device, the PPTC device will devices latch into a high resistance state
Implementation Method 2
a terminal assembly that is arranged for an automobile harness... a resettable fuse component, the resettable fuse component comprising a polymer positive temperature coefficient (PPTC) material, and coupled in series with the modified terminal
Data Source
AI summary
A terminal assembly, arranged for an automobile harness, comprising: a substrate; a modified terminal, arranged as a plate structure that is arranged on the substrate and extends perpendicularly with respect to a plane of the substrate; and a resettable fuse component, the resettable fuse component comprising a polymer positive temperature coefficient (PPTC) material, and coupled in series with the modified terminal.