PTC Thermistor Module with Zigzag Current Path to Reduce Hot Spots
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Solution Overview
Problem
PTC thermistor modules experience reduced efficiency and potential damage due to localized 'hot spots' caused by diagonal current flow through PTC thermistor elements, which worsen with increased operating voltages, leading to inefficient heating and cooling in temperature control devices.
Innovation Solution
The PTC thermistor module design features a zigzag current path between large outer surfaces, creating multiple hot spots with reduced temperature, resulting in more homogeneous temperature distribution and increased efficiency, and includes multiple conductor coatings on insulator plates to lengthen the current path and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If diagonal current flow is used through PTC thermistor elements, then the structure is simple, but hot spots are generated causing reduced efficiency and potential damage
Solution Approach 1:
The current path is segmented into multiple sections by introducing intermediate conductor coatings on the insulator plates. Instead of a single diagonal current path, the current flows through multiple segmented paths between the large outer surfaces, creating multiple hot spots that distribute the thermal load and prevent localized overheating.
Solution Approach 2:
Intermediate conductor coatings are introduced as mediator elements on the insulator plates. These conductor coatings serve as intermediary contact points that redirect the current flow from a direct diagonal path to a zigzag path, enabling better heat distribution while maintaining electrical insulation between the PTC elements.
2Power
If operating voltage is increased to improve heating performance, then power output increases, but hot spot temperature increases causing damage
Solution Approach 1:
The heating function is segmented across multiple current path sections. By creating multiple hot spots through the zigzag current path, the total heating power is distributed across several locations rather than concentrated in one area, allowing higher overall power output without excessive localized temperatures.
Solution Approach 2:
Different regions of the PTC thermistor element experience different thermal conditions. The zigzag current path creates specific localized hot spots at predetermined locations while other regions remain cooler, optimizing the thermal profile for efficient heating without uniform overheating that leads to damage.
3Ease of manufacture
If diagonal current path is used, then manufacturing is simple, but efficiency is reduced due to hot spots
Solution Approach 1:
The insulator plates serve multiple functions: they provide electrical insulation between PTC elements, support conductor coatings for current distribution, and facilitate the zigzag current path configuration. This multi-functionality maintains manufacturing simplicity while achieving improved heating efficiency through better heat distribution.
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
This design enhances the efficiency and operational reliability of PTC thermistor modules by distributing heat more evenly, preventing damage from hot spots and allowing for efficient operation at higher voltages.
Implementation Method 1
PTC thermistor elements through which a current flows during operation as a result of an electrical voltage being applied and which generate heat in the process
Implementation Method 2
PTC thermistor elements, also called PTC element, where PTC stands for 'Positive Temperature Coefficient'
Data Source
AI summary
A PTC thermistor module for a temperature control device may include at least one PTC thermistor element, two electrically insulating insulator plates, and a plurality of electrical conductors. The PTC thermistor element may have a flat element cross section, two opposing large outer surfaces, and two opposing small outer surfaces connecting the two large outer surfaces. The two insulator plates may be respectively connected to one of the two large outer surfaces. The plurality of electrical conductors may be configured as a plurality of electrically conductive conductor coatings, which may each be disposed on an associated insulator plate of the two insulator plates. At least one first conductor coating may be electrically connected to a first large outer surface of the two large outer surfaces. At least two second conductor coatings may be electrically connected to a second large outer surface of the two large outer surfaces.