Stable backing, motherboard capacitance talks about a motherboard, affecting its stability, is the design, wiring system and capacitance of the motherboard PCB substrate. So we generally observe its scalability when choosing the motherboard, then look at the main board thickness, the number of capacitances, and then observe the number of layers of the motherboard board and whether the wiring system is reasonable. And the capacitance, this often easily ignored the accessories ignored. Generally, we just pay attention to the number and power of the motherboard capacitance, and did not pay attention to its inner quality. Let's discuss this capacitor problem together. On the motherboard, we usually "visible" capacitors are distributed near the CPU socket and the main board external power interface, and the main responsible function in the motherboard is: 1. Energy, 2. Filter; 3. Delay. Capacitor ensures power supply stability to the main board and related fittings, and the miscellaneous waves in the current, and gives the CPU to transport a stable and pure current, and to ensure the stability of the relevant signals, The timing of the signal. It can be seen that how big is the impact of the capacitance of the operation of a motherboard. From the type of capacitor, the current capacitance product is generally scaled into a ceramic capacitor, an electrolytic capacitor, and a tantalum capacitor. They are distributed to different locations of the motherboard due to different functional features. The maximum impact on the stability performance of the whole block is mainly, mainly the electrolytic capacitance used by the power supply, and high-frequency ceramic capacitors near the CPU. The capacitance of the power supply provides the first filtration of the mains supplied by the external power supply, while the CPU and memory are second filtration, and strive to completely eliminate the miscellaneous waves (this, for electronics The computer of the signal carrier is critical. Both capacitors can withstand the relatively large voltage and current intensity, the disadvantage is that it is still not possible to filter the clutter in the current. At this time, it is necessary to use the upper tantalum capacitance. The shape of the tantalum capacitor is some of the resistors we see, most of the colors are black, between or earth-yellow. It is very simple to distinguish between the PCB substrate related positions. Generally, the starting letter is a tantalum capacitor, and "R" is a resistor; in addition, the capacitor has a positive and negative point, in order to install The welding is convenient, and the tantalum capacitor will be a crude strip on the positive electrode, and this can also be regarded as the difference between the tantalum capacitor. Most of the tantalum capacitors are mostly used on graphics cards and CPUs. It has the advantage that the filtering performance is excellent, but its disadvantages are relatively weak with respect to voltage and current. Therefore, more than ceramic capacitors, electrolytic capacitors, or applied to voltages, low currents. After understanding the role of the capacitor in the computer, let's see how to distinguish the quality of the capacitor. In general, it is seen from the capacitance capacity and the electric voltage resistance value, the capacitance can be divided into a variety of different capacity (μF) and different electricity resistance values, which are no longer listed here. In general, the capacitance of high voltage values appears to be in the vicinity of the external power interface of the motherboard, mainly for the first filter barrier. This capacitance is generally higher than that of other products, DUTANT, can be seen from the numbers indicated outside the capacitor. Whether it is withstand voltage and an upset ceramic capacitor and electrolytic capacitance, the capacitance capacity is not close, most of which are 2200μF, and there are also many main boards using 3500μF or 4500μ? Product, more The use of 5,000 μF or more tapped capacitive products. Only from the monomer capacitor, of course, the better the product, the better the product, in general, the capacity of high capacity is relatively large. However, the key to the capacity is to see the related numbers on the capacitor. The author has seen a huge and actual capacity of only 1100μF capacitors.
At the same time, everyone should not forget that the capacitor has never appeared on the board (especially near the power interface and CPU slot), and therefore, the total capacity is the most critical data! Due to the high capacity of a single capacitor, the overall capacity is ignored ... maybe everyone will notice that the planing of aluminum shell capacitor, the outer skin of the ceramic capacitor and electrolytic capacitance is almost colorful. What does it mean in this? Previously, the color of the capacitor package generally indicates the highest operating ambient temperature which can be affected by this capacitor (this temperature value can now be found on the outer skin package of the capacitor), and an important reference of the high quality of capacitance. However, with the increase of manufacturers, different manufacturers have begun to be different from the definition of "color". It can be used, temperature, etc. any meaning. Therefore, we don't have to take capacitors at all, and only consume the identification of the relevant performance indicators on the outer skin of the single capacitor. The ceramic capacitance and electrolytic capacitance used on the home motherboard, the maximum operating environment of the highest operating environment can generally be around 105 degrees Celsius, which is more than enough in the home use environment. However, if a inferior capacitor is used on the motherboard, it is very likely that the power supply is unstable, and the electrolytic capacitor can burst, damage the CPU and motherboard. From these introductions, I think everyone has a preliminary understanding of the main board. For some cases of stability and compatibility of the system due to poor material quality, the compatibility has been negative. In this regard, we are not difficult to understand why there are some prices sold by some major plants, and some small products that use the same chipset are very attractive. As an example of capacitors, high-quality products are nearly 20% to 40% in the difference between the poor quality products! Generally speaking, the product of famous brand big plants will have a comprehensive strict inspection and review measures. Taking domestic famous Lenovo - QDI as an example, from the product process, a motherboard has been introduced from the chipset to the motherboard to launch the market, about design, preparation, production, test, sales, and serve several parts. Now we will focus on the three parts of the preparation, production and testing. The product quality is good. It mainly looks at the main board materials, workmanship, and the quality of the experts will see the certification. At present, there are 7 special equipment such as Fuji, Panasonic, which is currently located in Huiyang. The automatic water production line, in terms of the quality management system, 1995 Lenovo QDI passed ISO9001 certification, and passed the ISO9001: 2000 version of domestic and foreign dual certification in August 2001, and also passed the ISO14001 domestic, foreign dual certification, this It can be uncomfortable in similar manufacturers. Through these perfect system management, QDI has strict quality control for design, procurement, and production, and after the chipset manufacturer launches a new chip, QDI starts monitoring product design and development from the beginning of motherboard design. Quality, optimize design processes and strengthen process control. When designing drawings, you can enter the preparation production stage. The QDI will affect the quality of the motherboard by reviewing the supplier quality system during the raw material procurement process. First, there will be preliminary review of the supplier supplier, the inspection after the storage of the storage, and more detailed and strict testing of the main board sample stage. Once a bad material is found, it will find that the cause is resolved, returned, or change the motherboard design. These, inevitably increase the final cost of the motherboard, but it can guarantee the quality of the product to ensure users' investment. During the main board production process, QDI also tracks the production process by monitoring all of the test production, and ensuring that the best raw material can get the best product.
