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The difference between 300W high power supply and 400W high power supply


There is only one difference between 300W high power supply and 400W, which is the different rated power. 300W high power supply The manufacturer tells you that the higher the power, the more devices the power supply can load.

There is only one difference between 300W high power supply and 400W, which is the different rated power. 300W high power supply
The manufacturer tells you that the higher the power, the more devices the power supply can load. The computer power supply is a device that converts 220 volts (V) alternating current into direct current and supplies power to computer accessories such as CPU, motherboard, hard disk, memory stick, graphics card, optical drive, etc. It is the hub of power supply for various parts of the computer, and it is the computer's power supply. An important part of.

Best 300W high power supply Manufacturers china
The composition of computer power supply
1. Filter
The manufacturer of 300W high power supply tells you that a power supply usually contains more than one electromagnetic filter, and the first one is located at the place where the mains is connected to the power supply. We can find it behind the 220V mains interface of a power supply. The main function of the circuit is to filter out bursts and high-frequency interference. On the other hand, it will also reduce the electromagnetic interference of the switching power supply itself to the outside world.
2. Protector
The manufacturer of 300W high power supply tells you that varistor is an indispensable component of every power supply, scattered on the printed circuit board (PCB), and its role is to provide protection for the power supply. Its principle is basically similar to that of our family's fuse, using a self-fusing method to cut off the current.
3. Filter circuit
The 300W high power supply manufacturer tells you that the most common one is a bridge filter circuit composed of four diodes and two filter capacitors. Computer power supplies are usually rectified in this way. According to different packaging modes, there are two common rectifier filter circuits commonly used in computer power supplies: one is composed of four independent diodes, and the other is a package of four diodes together, which is called a "full bridge".
The manufacturer of 300W high power supply tells you that whether full bridge or independent diode, the minimum withstand voltage and maximum current that can withstand are limited: the withstand voltage should not be less than 700V, and the maximum current should not be less than 1A.
4. Transformer
In the power supply, the transformer of course converts the high voltage to the low voltage for use by the computer. High school physics tells us: according to the principle of electromagnetics, the manufacturer of 300W high power supply tells you that the conversion ratio of a transformer is mainly determined by the number of turns of its coil. Therefore, a larger switching transformer can often transmit more energy and is of high quality. Or one of the observation points of inferior power supply, to a certain extent, the size of the transformer directly affects the true output power and quality of the power supply.
5. Protection circuit
The protection circuit inside the power supply monitors every move of the power supply and is the brain of the power supply. It is responsible for starting the power supply and monitoring and adjusting the voltage/current. At the same time, it automatically protects when there is a short circuit, open circuit, overvoltage, overcurrent, undervoltage, undercurrent, etc. 300W high power supply manufacturers tell you that inferior power supplies usually simplify this part of the circuit or even not set up a protection circuit at all, and all this will bring many hidden dangers to the computer system.
6. Circuit part
The manufacturer of 300W high power supply tells you that in the country's mandatory 3C certification, a power factor correction circuit must be added to the power supply to reduce the interference of the switching power supply to the external power grid. This is the PFC circuit inside the power supply. Therefore, a new component, PFC circuit, will appear in the latest power supply that has passed the national CCC certification.
7. Heat dissipation part
The 300W high power supply manufacturer tells you that the conversion efficiency of computer power is usually between 70-80%, which means that 20-30% of the energy will be converted into heat. The heat accumulated in the power supply cannot be dissipated in time, which will cause the local temperature of the power supply to be too high, thereby causing unnecessary damage to the power supply. Therefore, any power supply contains a heat sink, and the resulting fan exhaust and noise index are also two important indicators of the power supply.
The manufacturer of 300W high power supply tells you that the heat dissipation of the power supply is mainly carried out by the cooperation of the heat sink and the power tube. When we look through the gap, we can see that there is a huge heat sink inside the power supply. The performance and limit parameters of the high power tube above are directly affected. The safe carrying power and product cost to the power supply are also closely related to the margin of the power supply.

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