The power supply is the "heart" of the computer, and its stability and performance are directly related to the operating efficiency and life of the whole machine. So, facing the dazzling array of computer power supply products on the market, how can we accurately select?
Weight of power supply
Generally speaking: good power supply shells are generally made of high-quality steel, with good material and thick quality, so heavier power supplies have better materials. The parts inside the power supply, such as transformers, heat sinks, etc., are also heavier. The heat sink used by a good power supply should be aluminum or even copper, and the larger the volume, the better the heat dissipation effect. A good power supply will generally add some components to increase the safety factor, so the weight will naturally increase. Inferior power supplies will save some capacitors and coils, and the weight will be lighter.
Transformer of power supply
According to common sense, the inner diameter of the transformer coil of a 250W power supply should not be less than 28MM, and the inner diameter of a 300W power supply should not be less than 33MM. You can use a ruler to measure its length on the outside to know whether the material is solid. After the current passes through the transformer, it is output through the rectifier output coil.Most manufacturers use two output coils coded 10262 and 130626. The rectifier output coil of a 300W power supply should not be lower than the rectifier output coil of 130626. Next to the upright capacitor in the power supply, there will be a black bridge rectifier, and some use 4 diodes instead. In terms of stability, the stability of the bridge rectifier power supply.
Power supply fan
The fan plays an important role in the heat dissipation of the configuration during the operation of the power supply. The arrangement of the fan plays a decisive role in the heat dissipation capacity. The fans of traditional PC power supplies all use outward exhaust to dissipate heat, which can ensure that the heat in the power supply can be discharged in time, avoid heat accumulation in the power supply and chassis, and also avoid external dust from entering the chassis from the power supply during operation. There are two specifications of fans used in general PC power supplies: oil seal bearings and ball bearings. The former is quieter, but the latter has a longer life. It is best to use a magnetic levitation fan.
Power supply safety specifications
When the PC power supply is in use, it may be connected incorrectly or short-circuited. In addition, the power supply itself may fail, resulting in abnormal output voltage. In this case, in order to prevent or reduce serious consequences, the power supply must be able to stop working. This is the protection function of the power supply. Therefore, safety specifications are a very important part in the design and manufacture of power supplies. There are two aspects to the protection of power supplies. One is to prevent other accessories from burning, and the other is to protect itself from damage.
The power supply's external protection is mainly overvoltage and undervoltage protection, that is, when the output voltage of the power supply is abnormally high or low, the power supply will stop working. This is very important for the entire machine, because all expensive components, such as CPUs, hard disks, etc. are relatively fragile and can easily burn out due to excessive voltage.
Desktop power supply power
The rated power refers to the power that the power supply can maintain a stable output for a long time. The maximum power refers to the peak power that the power supply can output in a very short time. The two are completely different concepts. When choosing a power supply, players should select a power supply with a suitable rated power according to the total power consumption of the host under full load, and reserve enough watts to allow the power supply to work under the optimal load state.
