How To Improve The Reliability Of PCB Equipment (1)

(1) Simplify the design of the scheme.

When designing the scheme, under the premise of ensuring that the equipment meets the technical and performance indicators, the design should be simplified as much as possible, and the circuit and structural design should be simplified, so that each component becomes the simplest design.

The modular design method popular in the world today is an effective measure to improve equipment reliability.

The block function is relatively single, and the system is composed of modules, which can reduce the complexity of the design and standardize and standardize the design.

A large number of facts at home and abroad have proved this point, and product design should adopt modular design methods.

(2) Adopt modules and standard components.

Modules and standard components are products that have been proven to be highly reliable after a large number of tests and extensive use, which can fully eliminate equipment defects and hidden dangers, and also bring convenience to replacement and repair after problems occur.

The use of modules and standardized products can not only effectively improve the reliability of the equipment, but also greatly shorten the development cycle, providing extremely favorable conditions for the rapid modification and installation of the equipment.

(3) Improve integration. 　　

Choose a variety of large-scale and very large-scale integrated circuits with strong functions and high integration to minimize the number of components. The fewer the components, the fewer the hidden dangers. In this way, not only can the reliability of the equipment be improved, but also. Can shorten the research and development cycle. 　　

(4) Derating design. Derating design means that the component works under the condition of lower than its rated stress, which is an effective method to reduce the failure rate of the component. Therefore, when setting the juice, the working voltage range of the component should be adjusted under the premise of ensuring the technical performance index. Temperature characteristics, electrical characteristics and parameters are all derated to reduce the failure rate of components under various stress conditions. Derating design, the factors to be considered for different components are different: some are voltage range, some are current, some are temperature, some are frequency, some are vibration and so on. Under normal circumstances, the resistance voltage, frequency, temperature characteristics of the capacitor, the power of the resistance, the current and frequency characteristics of the inductor, the junction current, junction temperature or the junction current of diodes, triodes, thyristors, operational amplifiers, drivers, gate circuits, etc. The fan-out coefficient, the switch of the power supply and the withstand voltage/current and temperature performance of the main power supply cable, the frequency characteristics of the signal cable, and the use of heat sinks, connectors, module power supplies and other devices require berating design .

(5) Choose high-quality devices.

Components are the basic components of equipment, and their quality will directly affect the reliability of the equipment.

Military communication equipment should use products above industrial grade as much as possible, preferably military products, and strictly carry out aging screening before getting on the machine to eliminate early failure devices.