Heatable Composite Pane High-Voltage Safety
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Solution Overview
Problem
Electric vehicles face challenges in efficiently deicing windshields due to limited energy storage density, and existing electrically heatable windshield technologies are inefficient and pose safety risks at higher voltages, requiring special safety precautions and risking injury or death from direct contact.
Innovation Solution
A composite pane with a transparent, electrically conductive coating system that operates at DC voltages of 75 V to 450 V or AC voltages of 25 V to 450 V, featuring a high-voltage first coating insulated by a second coating connected to ground potential, ensuring safe operation and rapid deicing without direct contact hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional low-voltage (12V-42V) heating systems are used, then safety is improved, but deicing efficiency and speed are worsened
Solution Approach 1:
The patent changes the operating voltage parameter from conventional 12V-42V to high voltage 230V AC, enabling rapid deicing while implementing safety measures including electrically insulating intermediate layers and grounding arrangements to prevent hazardous current flow through the human body
Solution Approach 2:
The patent introduces electrically insulating intermediate layers as mediators between the high-voltage heating conductors and the external environment, preventing direct contact and hazardous current flow while allowing thermal energy to pass through for deicing function
2Productivity
If high-voltage (230V AC) heating is implemented, then deicing efficiency is improved, but safety risks worsen due to direct contact hazards
Solution Approach 1:
The patent introduces electrically insulating intermediate layers as mediators between the high-voltage heating conductors and the external environment, preventing direct contact and hazardous current flow while allowing thermal energy to pass through for deicing function
Solution Approach 2:
The patent converts the potentially harmful high voltage into a beneficial deicing tool by implementing grounding arrangements and insulating layers that channel any leakage current safely to ground, preventing hazardous current flow through the human body while maintaining efficient heating
3Loss of energy
If limited energy storage density is considered, then energy efficiency becomes critical, but deicing capability is worsened
Solution Approach 1:
The patent changes the operating voltage parameter to high voltage 230V AC, which enables efficient energy transfer and rapid deicing capability while minimizing energy loss from the limited onboard storage in electric vehicles
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 solution provides efficient deicing of windshields in electric vehicles at higher voltages while ensuring safety by preventing hazardous current flow through the human body, even in the event of damage or destruction, thus addressing both efficiency and safety concerns.
Implementation Method 1
The glass pane is heated by the development of Joule heat due to current flow resistance
Implementation Method 2
the second coating is connected via at least one third busbar to the ground potential
Data Source
AI summary
A composite pane is described. The composite pane has a first pane, at least one intermediate layer, a second pane, a transparent, electrically conductive first coating between the intermediate layer and the first pane and/or between the intermediate layer and the second pane, a first busbar and a second busbar, and a transparent, electrically conductive second coating.