How to improve the reliability of PCB circuit board equipment

(1) simplified scheme design.

In the design of the scheme, we should simplify the design, simplify the circuit and structure design, and make every part of the design to ensure the equipment meets the technical and performance parameters. The popular modular design method in the world is an effective measure to improve the reliability of the equipment. Block function is relatively single, the system consists of modules, can reduce the design complexity, the design standardization, standardization. A lot of facts at home and abroad have proved this point, product design should adopt the modular design method.

(2) using modules and standard components.

After a lot of testing and widely used proof for high reliability of the products, which can fully eliminate the defects and problems on the equipment, as well as problems after the replacement and repair convenience is a module and standard components. The modules and standard products can not only effectively improve equipment reliability and greatly shorten the development cycle, for quickly equipment modification and columns provide very favorable conditions.

(3) improve the integration degree.

Selection of a variety of functions, high degree of integration of large-scale, large scale integrated circuit, as far as possible to reduce the number of components. Less components, the less the risk of the point. In this way, not only can improve the reliability of the equipment, but also the. Can shorten the development cycle.

(4) drop design.

Derating design is refers to the components below the nominal stress conditions, is an effective method to reduce the failure rate of components. Therefore, juice under the precondition of ensuring the technical performance indicators, on the components of the operating voltage range, temperature characteristics, electric characteristic parameters such as take derating method, so as to reduce the components in different force conditions of failure rate.

Drop design, different components to consider the factors are not the same: there is a range of voltage, and some are the current size, and some are temperature, and some are frequency, and some are vibration and so on. Under normal circumstances, of capacitance voltage, frequency, temperature characteristics, resistance of the power, inductor current and frequency characteristics, diode, triode, controllable silicon, an operational amplifier, a driver and a gate circuit. The device junction current, temperature or fanout coefficient, power supply switch and a main power supply cable resistance voltage / current and temperature resistant performance, devices the frequency characteristics of the signal cable and radiator, connectors, power module and so on, to reduce the amount of design.

(5) select high-quality devices.

Component is the basic unit of equipment, the quality of its quality will directly affect the reliability of equipment. Military communication equipment should be adopted as far as possible above the level of industrial products, the best is the military, and in the machine before the strict screening of aging, eliminate the early failure of the device.

(6) make full use of software resources.

Due to the flexibility of software programming, software resources should be fully utilized in the design. At present, the software debugging tools and tools are relatively more, the fault and design problems are easy to locate, and the solution is relatively short. Making full use of software resources is an important method to improve the reliability.

(7) the structure is reliable, the technology is mature and advanced.

Circuit and structure design should be to minimize the number of connectors, the number of hole metallization, devices and circuit chip as far as possible the use of directly on a printed board welding method, the choice of surface mount devices, using surface mount technology, to avoid the bad contact, to ensure that the equipment reliability.

(8) thermal design.

High temperature is caused by one of the important factors to reduce the performance and reliability of the equipment, and this should take thermal protective measures to control and reduce the equipment of temperature liters, which set a good heat and thermal reliability of the improved equipment.

Too low temperature, also can cause the equipment performance and reliability to reduce, some components in the ambient temperature is too low, can't work properly. So the equipment used in low temperature environment, but also to carry out low temperature test. The temperature condition and environment of the equipment must be considered in the design.

(9) electromagnetic compatibility design.

Equipment will be subject to a lot of electromagnetic interference, there is also a natural. Military equipment is even more so, the modern high-tech electronics of the war of resistance against Japan, a very important technological means is a local emission of high energy electromagnetic wave to destroy each other equipment components, thereby enabling the equipment failure. Therefore, we should take effective shielding, filtering and other anti interference measures to prevent noise and interference of electromagnetic field on equipment, to ensure reliable operation of the equipment.

(10) anti vibration design.

Equipment in use, transport process will affected by all kinds of vibration and shock, which affects the reliability, for this reason, we should improve mechanical strength and stiffness, and damping measures taken, to strengthen equipment vibration and impact resistance ability, to improve equipment reliability.

(11) using fault indicating device.

Design of fault detection circuit and fault alarm device, in order to detect faults in time, so as to shorten the time of equipment failure.

(12) the operation is simple, the maintenance is convenient.

The function of operation and maintenance of equipment is one of the main factors to ensure the reliability of equipment. In the design, we should try to use the plug-in unit, module, while using modular, standardized structure and rapid disassembly structure, in order to facilitate the operation and maintenance. It is proved that the modular structure of the device can be greatly simplified operation, easy maintenance.


 

(Source: Inside information)

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