Networking applications are physically connected through the wiring harness. Most of the embedded controllers, embedded or pluggable multimedia, and wireless networked functions are powered via the vehicle battery directly, or through the ignition switch. This growing array of sensitive automotive electronics is susceptible to disturbances generated by the electrical system itself, by human interaction, or by load dump pulses. The ISO10605 25kV ESD surge test is applied to a complete system and simulates the ESD effect of human body contact on electronic modules in their environment. The AEC-Q standards address device ruggedness, including the human body model, machine model and charge device model tests (AEC-Q200 relates to passive components while AEC-Q101 relates to discrete semiconductors). Protecting the network and the connected components from damage caused by these types of overcurrent, overvoltage or overtemperature conditions can present complicated design challenges for both automakers and component suppliers. PolySwitch overcurrent protection devices are used to help protect communication and power circuits in automotive network applications. Like traditional fuses, they help prevent damage caused by harmful overcurrent surges and overtemperature faults by limiting the flow of dangerously high current. The PolySwitch devices, however, reset after the fault is cleared and power to the circuit is cycled. PolySwitch devices, which are polymeric positive temperature coefficient (PPTC) devices, are made of conductive filler, such as carbon black, that provides conductive chains throughout the device. The device exhibits low resistance characteristics under normal operating conditions, but when excessive current flows through it, its temperature increases and the crystalline polymer changes to an amorphous state. The authors describe the application of their system to protect nearly all well known automotive data buses.


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    Title :

    Circuit protection considerations for automotive information busses


    Additional title:

    Betrachtungen zur Netzsicherheit von fahrzeugspezifischen Informations-Bussystemen


    Contributors:


    Publication date :

    2009


    Size :

    10 Seiten, 21 Bilder, 2 Tabellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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