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How to improve the thermal reliability of PCB
How to improve the thermal reliability of PCB circuit board In many applications the weight and physical size is very important, if the actual power consumption component is very small, may cause the design safety factor is too high, so that the circuit board design was inconsistent with the actual or conservative power consumption value as according to the thermal analysis












Generally, the distribution of copper foil on PCB circuit board is very complex and difficult to model accurately. Therefore, when modeling need to simplify wiring shape, make the electronic components and the ANSYS model of circuit board actual circuit board close can also be used to simplify the modeling simulation, such as MOS tube, integrated circuit block etc.. thermal analysis Thermal analysis in SMT can assist the designer in determining the electrical performance of the components on the PCB circuit board and helping the designer to determine whether the components or circuit boards will be burned out due to high temperatures. The simple thermal analysis is only to calculate the average temperature of the circuit board, and the complex model is to build a transient model for the electronic equipment with multiple circuit boards. The accuracy of thermal analysis is ultimately determined by the accuracy of the component power dissipation provided by the circuit board designer. In many applications the weight and physical size is very important, if the actual power consumption component is very small, may cause the design safety factor is too high, so that the circuit board design was inconsistent with the actual or conservative power consumption value as according to the thermal analysis. On the contrary (and more severe) is the thermal design of safety coefficient is too low, the actual element operating temperature than analysts predicted to be high, such problems should be solved by general add a cooling fan to cool a device or circuit board. These external accessories increase the cost, but also prolong the manufacturing time, join in the design of fan will bring instability to the reliability, so the circuit board mainly adopts active rather than passive cooling methods (such as natural convection, conduction and radiation). Simplified modeling of circuit board Before modeling, what are the main heating elements in the circuit board, such as MOS tubes and integrated circuit blocks, which convert most of the loss power into heat at work. Therefore, these components need to be taken into account when modeling. In addition, copper foil applied on the circuit board substrate is also considered. They are in the design not only played the role of conductivity, but also play the role of heat conduction, the thermal conductivity and heat transfer area are relatively large circuit board is part of an electronic circuit, which is composed of epoxy resin coated copper wire as substrate and composition. The thickness of the epoxy resin substrate is 4mm, and the thickness of copper foil is 0.1mm. The thermal conductivity of copper is 400W/ (M DEG C), while the thermal conductivity of epoxy resin is only 0.276W/ (M DEG C). Although the copper foil is very thin and very thin, it has a strong guiding effect on heat, so it can not be ignored in modeling.
Japan Chuanshan Circuit Board Equipment Co., Ltd. was established in 1982, has experienced more than 30 years of growth and development. Over the years, we are committed to the development and manufacture of circuit board equipment for the circuit board industry to provide superior quality products and high quality Our main products include: Horizontal Wet Process Line, Cabinet and Tunnel Oven and Peripheral Automation Equipment. 1982 - 2008 We focus on Japan and Europe and the US market, 2010 We are in China And Southeast Asia and other regions, serving more than 500 circuit board manufacturers, is Japan's largest manufacturer of circuit board equipment one of the superior production results, handy operation, simple and efficient maintenance and safe and reliable operating system design concepts are It is the leading edge of the circuit board equipment industry, and has always been committed to the development and manufacture of circuit board equipment and ISO quality management system international standard. It is the quality of continuous operation of Chuanshan The company has developed a quality manual that meets ISO requirements, identifies service standards, document control systems, and speaks for all Related courses, in August 1985 and August 1990, respectively, passed the ISO-900 and ISO9001: 2000 BSI international certification. In September 1995, Chuan Shan successfully passed DNV certification CE, which not only proved that the Chuan Shan The results of efforts over the years, but also fully shows that we have been in progress, to make better products and efforts to enable customers in the production process as well as product quality to obtain greater protection.We use high precision CAD / CAM and the most Advanced simulation system to establish the unit structure, to its program, greatly improving the stability and reliability of the machine.We believe that advanced machinery and equipment and continuous improvement of production technology is the guarantee of high quality products.Therefore, we continue to introduce A large number of automated production systems, coupled with professional technical staff to meet the increasing quality of customer requirements. Chuan Shan has more than 1,000 professional technical staff, in accordance with the requirements of the project, provided by the Department of professional design and specification review, production Responsible for precision manufacturing and assembly, QC is rigorously tested to ensure the high quality of the product.With the increasing technical requirements of the industry, we have systematically More than 80 professionals from Japan and the United States are responsible for the development of research work, through their rich experience, the development of more advanced production technology and the development of high-quality, high-precision, Products, so that Katsuyama to maintain the leadership position in the market.In order to allow customers to fully appreciate the spirit of service Sichuan, we consider the needs of customers from various aspects and provide assistance; such as technical support, the effective supply of spare parts and professional advice To provide, etc. There are well-trained technical staff responsible for the installation of the machinery and equipment, operation training and maintenance works, Mu can provide the most complete after-sales service. Welcome to have the skills of the community to join!