What does it mean that MEAN WELL power supply has PFC function?

PFC: Power factor corrector, which is divided into active PFC and passive PFC.

Active PFC itself is equivalent to a switching power supply. It drives the switching tube through the control chip to "modulate" the input current so that it is as synchronized with the voltage as possible. Its power factor correction value can reach more than 98, so Generally, the energy conversion efficiency of power supplies using active PFC circuits is above 70, which is far higher than that of ordinary passive PFC circuits; however, its cost is relatively high, accounting for almost 20% to 30% of the overall cost of the entire power supply. The power factor correction value of the passive PFC circuit is generally only 60 to 70, and the energy conversion efficiency is less than 50.

For example, if a 300W power supply using active PFC has an energy conversion efficiency of 70, then it only requires 428W of AC power; on the contrary, a low-efficiency 300W power supply using passive PFC , if its energy conversion efficiency is only 40, then 750W AC power is needed to output 300W DC power to the computer, which is a total waste of 322W power.

Therefore, when choosing an energy-saving power supply, one must first choose a power supply designed with an active PFC circuit.

4PIN interface:

It is divided into large 4PIN D-type interface (4 pins side by side) and small 4PIN interface (12V, 2 pins side by side); the large 4PIN D-type interface is also called IDE The power interface generally provides power support for optical drives and hard disks, and sometimes also provides power support for chassis fans and graphics card fans. The small 4PIN interface (12V) generally provides auxiliary power support for the CPU and graphics card.

The power interface of the CPU refers to the CPU auxiliary power interface. It appeared together with the 845 series motherboards when the P4 CPU was first launched. This is because the CPU consumes a lot of power and the power supply is not enough. A single 12V power supply cannot To provide a stable current for the CPU, an auxiliary power supply is added. Some motherboards remove the 4-pin auxiliary power supply in order to save costs. This motherboard must have extremely poor overclocking performance.

6PIN interface:

One is a 6-pin side-by-side, which is the AUX 6-pin power socket for the current motherboard auxiliary memory power supply. It does not specifically refer to the previous AT power auxiliary interface, but It is extended for those motherboards with strict design requirements. The uses and definitions are different, so the necessity is not great, and it doesn't matter whether it is connected or not.

The other one is two rows of 3 pins, which refers to the graphics card auxiliary power supply interface (NVIDIA's NV45 and ATI's Radeon X800XT both use this 2*3 PIN power interface that we have never seen before. ), this interface is very similar to the 2*2 PIN power interface introduced on the Pentium 4 processor motherboard. In fact, it only uses a single 12V power supply, and the 5V of the original 4PIN interface will no longer be needed in the future. Two of the 2*3 PIN interfaces are 12V, and the other two are ground wires. Only 4PINs are actually used, but in order not to be confused with the 4PIN interface of the CPU, the graphics card manufacturer designed it as a 6PIN interface.

The 8PIN interface is equal to two 4PIN (12V) interfaces, but the term has changed.

The 20PIN interface is the power interface before ATX2.03.

The 24PIN interface comes after the P4 D version of the CPU, which consumes too much power. The power supply needs to be strengthened to adapt to the power consumption of the CPU. On the basis of the 20PIN ATX power interface, a 4PIN (12V) is added. The auxiliary power supply is the same as the 4PIN D-type interface mentioned earlier, they are just mentioned separately.

Taiwan MEAN WELL Power Supply’s first-level distribution in Jiangnan is recommended