Computer host power How to see the quality of the shrinkage material?

We are pleased to see that although the power supply can not be measured by performance, and can not escape the homogenization of the law, but the overall quality of the power supply than before a great progress. For example, a random grab-plus certified power supply a lot, in the past is unimaginable. But after all careful sailing, paralysis of thought will always lead to our Fanhun behavior. Therefore, it is necessary to review the power supply with the reverse angle.

So, what kind of power is called shrinking material?

1. Main capacitor

Why we put the main capacitor in the first place, because it is very easy to be in the factory in the process of tampering, but unless you are proficient in the capacitance of knowledge or you are very easy to recruit.

Main capacitor

Why do you say that? For example, three power supply: a 350W power supply is the Taiwan department Fung and the two capacitor 270μf, a section with 350W with the main capacitor 270μf, there is also a 400W of power supply is also a domestic main capacitor 270μf that section. Ask everyone a question, which is the most severe shrinkage? If you have a high school math relationship, then you will feel that the third paragraph is more severe, the first to second paragraph does not shrink.

270uF 400V Capacitor, up to no more than 450W rated power for good

High-end power supply employs two main capacitors, up to 270uF

In fact, in the market sales of these three power supply, the price is actually similar. This is the recessive profit. The current situation is that generally prefer to shrink the main capacitor, in fact, is not called "shrink", but just good to meet the main capacitance specifications to achieve the power limit. From the table below is to leave a relative amount of the main capacitor to buy and match, you can learn the capacitance of the corresponding power relationship.

If the upper limit of the above table to increase the 50W, the materials can also be used. If the power range is significantly higher than the above table, there is suspicion of shrinkage, we look at the power evaluation, buy power to see the parameters, we must pay attention to this point.

2. Main components

Good power, no lack of good detail

Large electrolytic capacitors, Schottky diodes, transistors and so on, the selection of these components directly affect the life of the power supply. Some manufacturers to reduce costs, the use of old materials, but manufacturers can not know the old devices still have how much life, it is likely that the factory soon, the device's life, light power outages, heavy device explosion. In addition, the capacitance of the pressure-resistant value of high, high-capacity capacitance can withstand high pressure and good filtering performance, of course, the cost is also high. If the use of inconsistent requirements, when the voltage is too large, the capacitance in the electrical solute left out, may explode, the harm is great.

3. Main transformer

We know that the PC power transformer is the 220V voltage into the output voltage of each component, such as +5v, +12v and so on. In fact, different sizes of the main transformer, will determine the matching power ratings.

The use of E35 specifications of the main transformer, power can reach more than 400W, but preferably not more than 500W

Transformers commonly used in the shape of iron core type E and C-type iron core. And PC Power is generally e-type iron core, E-type is the Japanese-style iron core, from the stamping forming of the EI film folded together, winding on the column. According to the different length of the steel sheet, divided into E35, E39, E43 and other specifications, at this time the corresponding rated power can reach 400W, 500W, 600W. So, if you encounter a 500W rated power supply, using the main transformer E35 iron core, then this power is shrunk.