IDB-1394 is designed for high-speed multimedia applications that transmit large amounts of information quickly in the car. This article details the requirements for the circuit protection devices required for IDB-1394 and how PPTC can accommodate such stringent protection requirements. In the automotive industry, the increasingly close relationship between family lifestyles and cars is on the rise. Adopted by the American Automotive Multimedia Interface Association (AMI-C), the global standardized interface, known as IDB-1394, was developed by the "1394 United Automotive Industry Group." A network called the IEEE 1394 serial bus in the consumer electronics industry is designed to target the transmission of multimedia content. It can be easily connected to a variety of consumer electronics devices and facilitates the quick installation of these devices.
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IDB-1394 is designed for high-speed multimedia applications that transmit large amounts of information quickly in the car. This open standard allows communication and interaction between portable electronic devices and the in-vehicle network to establish a communication channel between the two. The architecture of the in-vehicle network can be divided into an embedded network and a user convenience port (CCP). Current specifications define an in-line plastic optical fiber (POF) in-vehicle network as a specification similar to existing MOST (Media Oriented System Transport) technology. However, the former architecture is more robust, provides higher data transfer rates, and is easier to implement. The network can connect to a variety of electronic devices, such as DVD players, video displays, navigation systems, radio receiving devices, and communications devices such as wireless phones or emergency telematics and other multimedia applications. In hot-swappable automotive environments, there is a clear potential for short-circuit damage due to the frequent connection and disconnection of various peripherals on the power interface.
The power interface requires overcurrent protection, and the existing power supply standards used in current automotive systems were developed many years ago. Since the user-friendly interface is used to transmit signals and power, it must be protected against short-circuiting or damage to downstream equipment due to various faults such as poorly connected cables or connectors when plugged into the interface. This situation can occur frequently, so the short-circuit protection of the central control panel must be effective and reliable, and it is best to be able to reset. Current limiting can be achieved by using resistors, fuses, switches, or polymer positive temperature coefficient (PPTC) devices. Resistance protection schemes are rarely used today because they generate excessive voltage drops under normal current conditions. It is possible to use a one-time fuse solution, but this protection is prone to damage and must be replaced after a failure. The limitation of the bimetal switch is that it is repeatedly turned on and may cause contact fusion failure.
In many automotive electronics > automotive electronics applications, the best protection scheme is the PPTC (Polymer Positive Temperature Coefficient Device) device, which exhibits low impedance under normal operating conditions and high impedance in the event of a fault. Positive temperature coefficient devices are widely used in IEEE 1394 applications, often providing resettable circuit protection for computers, peripherals, and portable electronic devices. In automotive multimedia applications, such devices are commonly used for GPS positioning devices, CD replacement. Circuitry protection is provided by the input/output interfaces of the machine, audio and other electronic peripherals. PPTC devices are similar to conventional fuses in that they can limit dangerous high currents in the event of faults and persistence; the differences are: The PPTC device is automatically reset after the fault is removed and/or after the circuit power is removed.
Another advantage is that the PPTC device is compact and can be mounted directly on the board and can be mounted in electronic modules, junction boxes, and power distribution center components. Automotive products that use the universal electronics industry standard can help customers upgrade their cars with new products. The versatile bus also helps automakers solve the technically outdated problems caused by technological advances and continuous advances in the design cycle of automotive designs. In hot-swappable automotive environments, there is a clear potential for short-circuit damage due to the frequent connection and disconnection of various peripherals on the power interface. PPTC devices provide an effective overcurrent protection scheme for this problem.
This resettable circuit protection device also helps manufacturers produce safe and reliable products to meet regulatory agency requirements and reduce product repair costs. The IDB-1394 standard interface allows users to use hot-swappable devices, while overcurrent protection for power interfaces and portable devices on multimedia networks must be reliable and economical. Its low impedance, fast break response time, small form factor and resettable function help circuit designers design safe and reliable products to meet regulatory requirements and reduce warranty costs.
The advantages of PPTC products include manufacturing features that are compatible with large-scale electronic assembly technology, and a wide range of products to choose from, providing greater design flexibility.
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