Glazed Panel Heating with Edge-Relocated Busbars
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Solution Overview
Problem
Conventional glazed panel heating systems often compromise transparency and require frames or frits, limiting their application in scenarios where both heating and visibility are needed, such as vehicle windows.
Innovation Solution
The implementation of low-profile busbars and conductive layers on glass panes, with traces and busbars strategically located along edge portions or within interlayers, allows for heating while maintaining transparency by hiding the electrical components from view and reducing the need for frames or frits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating systems are used in glazed panels, then heating function is provided, but transparency and visible area are reduced due to frames or frits
Solution Approach 1:
The heating system extracts the electrical components (busbars and traces) from the visible face of the glass panel and relocates them to the edges and interlayers. This extraction allows the heating function to be maintained while the transparent area is maximized, as the electrical components are no longer obstructing the view from the interior.
Solution Approach 2:
The system moves electrical components from two-dimensional surface placement (on the glass face) to three-dimensional edge and interlayer positioning. By placing busbars at the edges and traces within the interlayer, the heating elements are relocated to dimensions that do not compromise the visible transparent area of the panel.
2Reliability
If busbars are placed on the glass surface for heating, then electrical contact is achieved, but visibility is obstructed
Solution Approach 1:
The busbars are extracted from the visible glass surface and relocated to the edges of the panel. This extraction maintains reliable electrical contact for heating while removing the visual obstruction from the interior view, as the busbars are now positioned at the periphery where they do not block the view.
3Strength
If frames or frits are used to support heating elements, then structural support is provided, but transparent area is reduced
Solution Approach 1:
The system extracts the need for frames and frits by integrating the electrical components directly into the edge treatments and interlayers of the glass panel. This extraction eliminates the requirement for additional structural elements that would obstruct the view, while the edge treatments themselves provide the necessary structural support for the heating elements.
4Reliability
If heating elements are visible on the glass panel, then heating function is clear, but aesthetic appearance and transparency are compromised
Solution Approach 1:
The heating elements are extracted from the visible surface and relocated to edges and interlayers. This extraction maintains the heating function's reliability while improving aesthetic appearance and transparency, as the electrical components are no longer visible from the interior of the vehicle.
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 solution provides efficient heating for defrost or defog conditions without obstructing visibility, offering a faster and more controlled defrosting process compared to traditional HVAC systems while maintaining passenger comfort and increasing the transparent area of the glass panel.
Implementation Method 1
Applying power to the first busbar causes current to travel from the first busbar along the conductive layer to the second busbar, heating the pane surface
Implementation Method 2
Applying power to the first busbar causes current to travel from the first busbar along the first conductive layer to the trace and along the second conductive layer to the second busbar, heating the pane surfaces of the first glass pane and the second glass pane
Implementation Method 3
The second busbar contacts the trace with the glass pane in the contact position. Applying power to the trace causes current to travel from the trace to the second busbar across the conductive layer to the first busbar with the glass pane in the contact position, heating the pane surface
Implementation Method 4
bonding either a polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA) interlayer between two glass panes using a vacuum to remove air from between the glass panes
Data Source
AI summary
A heating system includes a conductive layer disposed on a pane surface of a glass pane, a first busbar extending along a first pane edge portion of the glass plane in electrical contact with the conductive layer, and a second busbar extending along a second pane edge portion of the glass plane in electrical contact with the conductive layer. Applying power to the first busbar causes current to travel from the first busbar along the conductive layer to the second busbar, heating the pane surface.