As we all know, PCBs are indispensable for almost all electronic products (including, of course, storage products). So when our RD initially designed the PCB for our storage products, it accordingly followed some technical measures to improve reliability, such as Program selection, design, structural design, selection, production process, and other aspects, the specific measures are as follows
Simplified scheme design
On the premise of ensuring that the equipment meets the technical and performance indicators, the design should be simplified as far as possible, and the circuit and structure design should be simplified so that each component becomes the simplest design. Nowadays, the popular design method is an effective measure to improve the reliability of equipment. The block function is relatively single, the system is composed of modules, which can reduce the complexity of design, design standardization, and standardization. A large number of facts at home and abroad have proved this point, product design should adopt a modular design method.
Use of modules and standard components
Modules and standard parts are proved to be highly reliable products after a lot of tests and extensive use, which can fully eliminate the defects and hidden dangers of equipment, and also bring convenience for replacement and repair after problems. Using modules and standardized products can not only effectively improve the reliability of the equipment, but also greatly shorten the development period, and provide a very favorable condition for rapid modification and assembly of the equipment.
Choose a variety of large and super scales with strong functions and high integration to minimize the number of components. The fewer components there are, the fewer potential pitfalls there are. In this way, it can not only improve the reliability of equipment but also. Can shorten the development, development cycle.
Derating design refers to the components working in below-rated conditions, is one of the effective methods to reduce the failure rate of components, therefore, is designed on the premise of ensuring the technical performance indicators, when the working voltage range, the temperature characteristics of components, the electric characteristic parameters such as adopt derating use method, so as to reduce the failure rate of the components under various stress conditions.
In derating design, different components take into account different factors: voltage range, size, temperature, frequency, and so on. In general, the high voltage, frequency, and temperature characteristics of the power, current and frequency characteristic, gate drive device of junction current and junction temperature or fan out coefficient, power supply, and main power source voltage/current resistance and heat resistance performance of cable, signal cable frequency characteristic, and the radiator, connectors, modules, power supply such as the use of, Derating design is required.
Select high-quality devices
Components are the basic components of the equipment, and their quality will directly affect the reliability of the equipment. Military communication equipment should use industrial-grade or above products as far as possible, preferably military products, and strictly carry out aging screening before the machine, to eliminate early failure devices.
Make full use of software resources
Because of the flexibility of software programming, software resources should be fully used in the design. At present, the software debugging means and tools are relatively many, and it is easy to locate faults and design problems, and the solution cycle is relatively short. Making full use of software resources is an important method to improve reliability.
Reliable structure, mature technology, advanced
In circuit and structure design, the number of connectors and metalized holes should be reduced as far as possible. Circuit devices and chips should be directly on the printed board as far as possible. Surface mount devices and surface mount technology should be selected to avoid bad contact and ensure the reliability of equipment.
High temperature is one of the important factors that reduce device performance and reliability. Therefore, you need to take thermal protection measures to control and reduce the temperature rise of the device to ensure good heat dissipation and improve the thermal reliability of the device.
Low temperature also reduces device performance and reliability. Some components cannot work properly when the ambient temperature is too low. So the equipment used in a low-temperature environment, also need to carry out the low-temperature test. The temperature and environment of the equipment must be considered in the design.
Equipment is subjected to a variety of electromagnetic interference, both natural and man-made. This is especially true of military equipment. In the war of resistance against modern high-tech electronics, a very important technical means is to locally emit high-energy electromagnetic waves to destroy components of the other side’s equipment, so as to make the equipment work out of order. Therefore, effective anti-interference measures such as shielding and filtering should be taken to prevent interference from noise and electromagnetic fields to ensure the reliable operation of the device.
The equipment will be affected by all kinds of vibrations and impacts in the process of use and transportation, thus affecting its reliability. Therefore, the strength and stiffness of the equipment should be improved, and damping and buffering measures should be taken to strengthen the ability of the equipment to resist vibration and impact and improve its reliability of the equipment.
Use fault indicating device
Design fault detection circuit and fault alarm device, in order to find the fault in time, so as to shorten the time of equipment troubleshooting.
Simple operation and convenient maintenance
The operation and maintenance function of the equipment is one of the main factors to ensure the reliability of equipment. In the design, insertion units and modules should be adopted as far as possible, and modular, standardized structure and fast disassembly structure should be adopted to facilitate operation and maintenance. It has been proved that the modular structure of the equipment can greatly simplify operation and facilitate maintenance.