USB connector design brief
USB (Universal Serial Bus) is gradually developed into a standard transport protocol. There is no doubt that this development has benefited from the USB interface in many electronic products widely used. Therefore, the configuration of these devices on the vehicle universal bus is very reasonable and wise choice.
In the past decade, integrated communications technology in the rapid development of various types of vehicles. Car radio car has undoubtedly become the "main unit", responsible for the large number of applications and device features central coordination.
At the same time, electronic products (such as laptops, iPods, mobile phones, MP3 players and memory sticks, etc.) range of applications in cars is also increasing, therefore, must ensure that the data transmission between the electronic products with existing vehicle equipment reliability; in addition, the data transmission system is not only assembled in the upscale and luxury vehicles, but also to the progressive development of the standard configuration of the vehicle, which has become the mainstream trend.
USB is gradually developing into a standard transport protocol. Although the market has been able to provide a large number of associated transmission parts, especially in the technical aspects of the connection (connector and transmission lines), and the use of these accessories is also very easy and quick, but in some cases, the use of these products will applications become complex and risky.
For the current USB interface device gradually began to use the car, the connector and the cable car are often not based on harsh environments. Therefore, the most simple circuit design is not necessarily the most successful design. The device loose laying cables, adapters, wires, especially the shield poor line connection will significantly worsen electromagnetic condition of the vehicle interior.
Based on many years experience in mass production of products that the design of these products must also meet a number of other boundary conditions in vehicle use, including very harsh environmental requirements, for example, suffer from vibration, humidity, conditions of gas contamination and mechanical stress, the related components must be able to operate properly within the specified temperature range. These requirements will ensure that the vehicle-related components have life 15 to 20 years or so.
Of course, these functions are directly related to the automobile factory; In addition, the frequency of use is also a USB plug connector is very important as an indicator. While mobile phones, computers and many other electronic products every two to three years will have to be replaced once, but after calculation, the vehicle USB interface must be about 20 years of life in guaranteed patch 20000 times.
The interface will be the miniaturization of the next few years, the use of mini or micro USB interface is only a matter of time. Through an integrated product concept to solve these problems through the use of the principle is fully compatible with the use of the vehicle connectors and cables, combined with the flexibility to replace the USB adapter to resolve.
High speed connectors on the basis of the principle:
In the development suitable for high frequency Automotive Connection System, the primary consideration its accuracy in harsh environments, mechanical strength and design issues of general applicability. To achieve symmetrical high frequency electrical signals via cable and interference-free data communication interface, the following features is also very important: constant impedance transmission line; insulation material dielectric loss; terminal connectors are well-connected low resistance; signal pairs rule stranded wire; shield portion duplicate coverage.
Obviously, if you do not do extra effort, these special requirements will not be achieved. At the same time, we must also note that some conditions or conflicting. More importantly, how to choose the terminal connection system, it must be able to guarantee the life of the vehicle in good termination. The problem here may face include homogeneous low contact resistance and impedance, and a socket and terminal contact patch area.