Hybrid PTC NTC Device for Wide-Temperature Protection
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Solution Overview
Problem
Conventional positive temperature coefficient (PTC) materials are inadequate for applications requiring protection at lower temperatures, as they remain in a low resistance state and do not effectively limit current at these temperatures.
Innovation Solution
A hybrid device incorporating both positive and negative temperature coefficient materials, with specific structures and configurations of conductive and semiconductor particles within polymer matrices, to achieve a hybrid device that exhibits both PTC and NTC characteristics, allowing for current limitation at both high and low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PTC materials are used, then protection from operation at high temperatures is achieved, but protection from operation at lower temperatures is not provided
Solution Approach 1:
The patent combines PTC materials and NTC materials into a single composite device structure. The PTC material layer provides high-temperature protection by increasing resistance above its transition temperature, while the NTC material layer provides low-temperature protection by increasing resistance below its transition temperature. This composite structure enables the device to protect against both high and low temperature operations, resolving the contradiction between high-temperature protection capability and temperature coverage versatility.
2Reliability
If PTC materials remain in low resistance state at lower temperatures, then good conductivity is maintained, but current limitation at lower temperatures cannot be achieved
Solution Approach 1:
The patent applies different material properties to different regions (layers) of the device. The NTC material layer is specifically designed to exhibit negative temperature coefficient behavior at lower temperatures, providing current limitation in this temperature range. The PTC material layer is designed to exhibit positive temperature coefficient behavior at higher temperatures. This local differentiation of material properties allows the device to achieve current limitation at low temperatures without compromising the overall energy dissipation characteristics of the composite structure.
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 hybrid device provides effective protection by maintaining low resistance at intermediate temperatures and increasing resistance at both low and high temperatures, effectively safeguarding components from excessive temperature operations.
Implementation Method 1
The conductive particles exhibit a positive temperature coefficient characteristic and the negative temperature coefficient particles exhibit a negative temperature coefficient characteristic
Implementation Method 2
The conductive particles exhibit a positive temperature coefficient characteristic and the negative temperature coefficient particles exhibit a negative temperature coefficient characteristic
Implementation Method 3
At such a transition temperature, often above room temperature, the polymer matrix may expand and disrupt the electrically conductive network, rendering the composite much less electrically conductive
Data Source
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AI summary
A hybrid device, comprising: a first electrode, disposed on a first side of the hybrid device, a second electrode, disposed on a second side of the hybrid device, opposite the first side. The hybrid device may further include at least one layer, disposed between the first electrode and the second electrode, the at least one layer comprising a negative temperature coefficient material and a plurality of conductive particles, wherein the hybrid device exhibits a positive temperature coefficient characteristic and a negative temperature coefficient characteristic.