Polycarbonate Composite for High-CTI EE Conductor Spacing
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Solution Overview
Problem
Polycarbonate materials exhibit low comparative tracking index (CTI), limiting their use in high-voltage applications due to the risk of short circuits and fire, which is critical in electromobility and other electrical components where compact designs are desired.
Innovation Solution
A thermoplastic composition comprising bisphenol A-based polycarbonate, fluorine-containing anti-drip agent, and phosphorus-containing flame retardants, specifically phosphazenes or organophosphates, enhances the CTI to at least 600 V, allowing closer conductor spacing without sparkover, suitable for operating voltages up to 1000 V.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polycarbonate material is used in EE components, then impact resistance and heat distortion resistance are improved, but tracking current resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining polycarbonate with specific additives (silane-modified polyethylene, antimony trioxide, and phosphorus-containing compounds) to create a material that exhibits both high impact resistance and high tracking current resistance (CTI ≥ 400 V). The composite formulation allows the base polycarbonate to provide mechanical strength while the additives confer electrical tracking resistance.
Solution Approach 2:
The patent changes the chemical and physical parameters of polycarbonate by incorporating specific compounds in defined proportions. The silane-modified polyethylene (0.1-5 wt%), antimony trioxide (0.1-5 wt%), and phosphorus-containing compounds (0.1-5 wt%) modify the material's surface properties and electrical characteristics, transforming it from low CTI to high CTI performance.
2Volume of moving object
If material with high CTI value is used, then conductor spacing can be reduced for compact designs, but material selection is limited
Solution Approach 1:
The patent creates a versatile composite material system based on polycarbonate that achieves high CTI values, enabling compact component designs. The composite formulation can be adapted to different application requirements while maintaining both mechanical integrity and electrical safety, thus expanding material selection flexibility for high-voltage applications.
Solution Approach 2:
The developed polycarbonate composite serves multiple functions simultaneously: it provides structural support, impact resistance, heat distortion resistance, and high tracking current resistance. This multi-functional material can be universally applied in various high-voltage EE components requiring compact designs, such as battery housings and electrical connectors.
3Volume of moving object
If conductor distance is reduced for compact design, then component size decreases, but risk of short circuit increases
Solution Approach 1:
The patent employs composite materials with high CTI rating to enable reduced conductor spacing while maintaining short circuit prevention. The silane-modified polyethylene, antimony trioxide, and phosphorus-containing compounds create a material surface that resists tracking current formation, allowing conductors to be placed closer together without increasing short circuit risk.
Data Source
AI summary
The invention relates to an EE device including depending on the operating voltage applied, different distance ranges between the electrical conductors, the distances being so small that already the material used between the electrical conductors results in a very high comparative tracking index. Surprisingly, this material is a polycarbonate-based material the comparative tracking index of which is significantly increased when relatively small amounts of fluorine-containing anti-dripping agent and phosphorus-based retardant are added.