Application of PolySwitch PPTC device in the car electronic IEEE 1394 network
Article by Keith Farren
In auto industry, family’s life style and ever closer connection of the car are in the ascendant. Adopt it by the American car multimedia interface association (AMI-C) The global standardized interface made, known as IDB-1394, ” 1394 union car industrial groups ” Make. Consuming the electronic industry and calling IEEE 1394 serial total collinear network, regard many transmission of media content as the goal during design. Can link with various consumer-elcetronics devices conveniently, and installation offer the facility fast for apparatus these. IDB-1394 design used for high-speed multimedia application, namely the information of a large amount of of speedy transmission in the car. This open standard allows to carry on the connected sum interdynamically to operate between portable electronics and on-vehicle network, thus in order to both set up communicative channel. Employ and summarize and is shown as in Fig. 1, the framework of the on-vehicle network can be divided into inner embedded network and user’s convenient port (CCP) . The inner embedded plastic optical fiber (POF) present technical specification The on-vehicle network defines as and Off-The-Shelf MOST ( media’s orientation system is transmitted) Specification with similar technology. However, the former’s framework is firmer, can support more high message transmission rate, and easier to realize. This network can connect various electronic device, such as DVD broadcaster, video display screen, navigation system, receiving apparatus of the radio and communication apparatus, if Cordless Phone or telecommunication and other multimedia applications of meeting an urgent need automatically. The protection requirement of the circuit is in heat plugs the car environment, because the customer often wants on the interface of the power the connected sum disconnect various peripheral hardware, so the spoiled potential hazard of the short circuit obviously takes place. The intersection of power and the intersection of interface requirement and with current protection function, and standard to make before the many years. Because user convenient for interface to use for transmission signal and power supply, must go on and protects to it, in order to prevent because of various troubles, when for example the cable or splice of the loose contact inserts the interface, the damage of the apparatus the short circuit takes place or cause descenting. This kind of situation probably often takes place, so the short circuit protection of the central control panel must be effective and reliable, and is preferably able to reset. It can be by using resistance, safety fuse, switch or polymer positive temperature coefficient (PPTC) that the electric current is limited The device is come to realize. Seldom adopt the protection scheme of the resistance at present, because it will produce the too big voltage drop in normal current state. May adopt the disposable safety fuse scheme, but this kind of protection is easy to damage, and must change after breaking down. The limitation of the bimetal release lies in it exists and puts through repeatedly, and may cause the contact and melt to connect with the trouble. In a lot of car electrons ” >In the car electron employs, the preferably protection scheme is PPTC device, this kind of device presents the low resistance in normal operation state, and high impedance appears while breaking down. The Model PolySwitch polymer positive temperature coefficient device is used in the application of IEEE 1394 extensively, often can offer resetting circuit protection for computer, peripheral hardware and portable electronics. In the car multimedia application, the device use for for the intersection of GPS and positioning device often and the intersection of CD and the intersection of changing defective pieces and plane, stereo, and input / output interface that set up offer circuit protection (see 2 Fig.) outside the other electron . PPTC device and traditional fuse similarity lie in: Can limit the dangerous heavy current in emerging and lasting in trouble state; And the difference lies in: After after fault clearance and/ the or circuit power is disconnected, PPTC device can reset automatically. Another advantage is that PPTC devices are comparatively small and exquisite, can install on circuit board directly, and can install in electronic module, terminal box and distribution center part. Adopt common the intersection of electronics industry and canonial vehicle carried products, can help customer utilize products that appear on the market newly come on the intersection of staging and car. And general bus line help automaker in technical progress, advance constantly too car design, circulate in the periodic situation, solve the problem that the technology that initiates from this is out of date. In heat plugs the car environment, because the customer often wants on the interface of the power the connected sum disconnect various peripheral hardware, so the spoiled potential hazard of the short circuit obviously takes place. And PPTC device has offered the valid excess current protection scheme for this question. This kind of circuit protective device that can be reset helps manufacturers to produce the safe and reliable products too, in order to meet the requirement of the administrative organ, and reduce the repair cost of the products. IDB-1394 standard interface allows users to use heat to plug the apparatus, and must be reliable and economic to the interface of the power and overcurrent protection in the multimedia network of porable equipment. PolySwitch series low resistance, fast the intersection of breaking and response time, the intersection of appearance and little and but the intersection of reset function,etc. and characteristic that device have, help the circuit designer to design the safe and reliable products, in order to meet the requirement of the administrative organ, and reduce and guarantee the cost. The advantage of PolySwitch products also includes assembling the compatible manufacture characteristic of technology with the large-scale electron, and the selective range of product is very extensive, have offered greater flexibility in design.
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