PTC Heating Device With Selective Conductor Tracks
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Solution Overview
Problem
Existing PTC heating devices lack the ability to adjust heating power in a more differentiated manner, particularly in confined spaces like motor vehicles, where vibrations can cause conductor misalignment and require precise control.
Innovation Solution
The PTC heating device features multiple conductive traces on one side and opposing traces on the other, each assigned to specific PTC elements, with insulating layers to prevent misalignment and allow selective energization, enabling fine-tuned heating power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple PTC elements are arranged in a frame with conductor tracks on one side only, then the device complexity is reduced, but the heating power cannot be adjusted in a differentiated manner
Solution Approach 1:
The patent divides the heating device into multiple independent heating circuits, where each circuit consists of at least one PTC element and its dedicated conductor tracks. This segmentation allows each heating circuit to be controlled independently, enabling differentiated heating power adjustment across different regions of the heating device without requiring a complex overall structure.
Solution Approach 2:
The patent implements local quality by providing conductor tracks specifically assigned to individual PTC elements or groups of PTC elements. This allows different regions (local areas) of the heating device to have different heating powers independently controlled, achieving spatially differentiated heating capabilities while maintaining a relatively simple overall device structure.
2Manufacturing precision
If conductor tracks are provided without insulating layers, then the manufacturing precision requirements are reduced, but vibrations can cause conductor misalignment and unreliable power distribution
Solution Approach 1:
The patent applies beforehand cushioning by providing insulating layers between the conductor tracks and the PTC elements before assembly. These insulating layers act as a buffer that prevents direct contact and potential misalignment issues, ensuring reliable power distribution even when vibrations occur during operation. The insulating layers are positioned in advance during manufacturing to prevent future alignment problems.
3Reliability
If insulating layers are added to prevent conductor misalignment, then the reliability of power distribution is improved, but the device complexity increases
Solution Approach 1:
The patent merges the insulating layers with the frame structure or integrates them into the existing conductor track assembly. By combining the insulating function with existing structural elements rather than adding completely separate components, the reliability of conductor alignment is improved while minimizing the increase in overall device complexity.
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 allows for precise control of heating power from 0 to 100% per heating circuit, enhancing thermal management in motor vehicles by preventing conductor misalignment and ensuring reliable power distribution.
Implementation Method 1
PTC heating device with multiple PTC elements and electrical conductors between which the multiple PTC elements are arranged. The PTC elements are electrically connected to the conductors so that the PTC elements can be energized with different polarities.
Data Source
Figure 1~2
Figure 3a~3b
Figure 3c~3d
AI summary
A PTC heating device (2) comprising several PTC elements (4) and electrical conductors (6, 10) between which the PTC elements (4) are provided and which are electrically connected to the PTC elements (4), and a frame (14) forming at least one receptacle (16) for the PTC elements (4), which is provided between the electrical conductors (6, 10). To adjust the heating power of the PTC heating device, the present invention proposes providing at least two conductors (6a, 6b) on at least one side of the PTC elements (4), which are electrically connected to different PTC elements (4).