Six key parameters for purchasing computer power supply

When you buy a computer power supply, be sure to pay attention to the following six power supply parameters, which can choose a high-quality power is very helpful oh ~

One, the weight of the power supply

Through the weight can often observe the power supply to meet the specifications, generally speaking: good power shell generally use high-quality steel, good material, thick, so heavier power supply, material is better. The internal parts of the power supply, such as transformers, heat sinks, and so on, the same heavy relatively good. Good power use of the heatsink should be aluminum or even copper heat sink, and the larger the heat dissipation effect is better. The general heatsink is made into a comb, the teeth are deep, the more open, the thickness of the larger, the better the cooling effect. Basically, it is difficult to see the heatsink without disconnecting the power supply, so the intuitive approach is to judge from the weight. Good power supply, will generally add some components to improve safety factor, so the weight will naturally increase. The inferior power supply will omit some capacitors and coils, and the weight will be lighter.

Second, the Power transformer

The key part of the power supply is the transformer, the simple method is to look at the transformer size. General transformer position in the two pieces of heat sink, according to common sense, 250W power transformer line diameter should not be less than the 28mm,300w power supply should not be less than 33MM, you can use a ruler in the external measurement of its length, you can know that its materials are not real. After the current through the transformer, through the rectifier output coil output. In the current output, you can see the rectifier output coil, most manufacturers use code number 10262 and 1,306,262, 250W power supply rectifier output coil should not be less than 10262 of the rectifier output coil. The rectifier output coil of the 300W power supply shall not be less than 130626 of the rectifier output coil. In the power supply, the upright capacitor side, there will be a black bridge rectifier, and some of the use of 4 two-level tubes instead. As far as stability is concerned, the power supply stability of the bridge rectifier.

Third, the power supply fan

In the process of power supply, the fan plays an important role in the configuration of heat dissipation. Disperses the piece only to circulate the heat to the air, if the hot air cannot disperse in time, the heat dissipation effect will be greatly reduced. The arrangement of the fans determines the cooling capacity. Traditional ATX2.01 version of the PC power supply fans are used to external ventilation mode of cooling, so as to ensure that the power supply of heat can be discharged in time to avoid heat in the power supply and the accumulation of the chassis, but also to avoid the work of the external dust from the power into the chassis. The general PC power supply will be used in two types of fans: Oil seal bearing (Sleeve bearing) and ball bearing (Ball bearing), the former relatively quiet, but the latter life is longer, of course, if the use of magnetic levitation fan is even better!

In addition, some high-quality power supply will be a double fan design, such as in the intake of the installation of a 8 cm fan, so that the air flow speed. However, the use of dual-fan design, there is a disadvantage: that is, the power supply inside the heat increased, bring noise. Some manufacturers will adopt a high sensitivity temperature-controlled bass fan, the fan with thermal diode can be based on the chassis and the different temperature in the power supply to adjust the speed of the fan, the second is to increase the intake of air inlet, so that the power inlet fan and outlet fan to operate at different speeds, To ensure that the internal heat generated by the source of the hot air and from the chassis of the hot air pumped into the timely discharge.

Moreover, the fan in unit time internal energy driven by the heat dissipation effect is directly related to, there is no special instrument this is difficult to consider, so generally the problem is simply the speed of the fan, and then into power and converted to electricity. Generally speaking, rated current as an important indicator of the purchase, in the same voltage, the higher the current fan power, the stronger the wind, which is our only choice when the Judge standard. For example, the rated current of a 8 cm 12V DC fan used in general power supply is usually between 0.12~0.18a.

Four, the Power supply safety specification

PC power supply In use, there may be wrong or short circuit, the other power itself may also cause the output voltage is not normal, in this case, in order to prevent or reduce serious consequences, the power supply to be able to stop working, this is the power supply protection function. Therefore, in the design and manufacture of power supply, safety specification is a very important link. Power protection has two aspects, one is to prevent the burning of other accessories, in addition to protect themselves from damage.

The external protection of power supply is mainly over voltage and undervoltage protection, that is, when the output voltage of the power supply is high or low to abnormal, the power supply will stop working. This is very important for the whole machine, because all the expensive parts, such as CPU, hard disk, etc. are relatively fragile, it is easy to burn because of excessive voltage.