What is an active PFC definition?

PFC (Power Factor correction) is "PFC", the power factor refers to the relationship between the effective power and the total power consumption (depending on the electricity), i.e. the ratio of the effective power divided by the total power consumption (depending on the wattage). There are two kinds of PFC, one is passive PFC (also called passive PFC), the other is active PFC (also known as initiative PFC).

Active PFC is mainly composed of high frequency inductance, switch tubes, capacitors and control IC components, can be simply summed up as a step-up switching power supply circuit, the characteristics of this circuit is complex structure, but many advantages: the power factor of up to 0.99, low loss and high reliability, input voltage can be from 90V to 270V (wide input) and so on, Because the output DC voltage ripple is very small, the active PFC power supply does not need to use a large capacity of the filter capacitor.

Active PFC, also known as actively PFC, in its circuit is often the integration of highly integrated IC, can adapt to 90v~270v input voltage, and has more than 0.99 of the line power factor and the advantages of higher reliability. The output is not fluctuating with the input voltage, so high stability output can be obtained.

Compared with passive PFC, active PFC is no longer required to use a large capacity filter capacitor. But the power supply with active PFC design is higher than the price. Active PFC does not represent a better performance than passive PFC, and is not a high-end symbol, for ordinary users, the main role of active PFC is wide voltage.

Active loss of more. That 80% is entirely because of the increase in the proportion of output power of 12v, that is, other power supply as long as the output power 12v proportion increase efficiency will go up, it is not a strange thing. Also, the power supply must work under a certain load conditions to achieve maximum efficiency, such as 400w power with 350w load efficiency is the highest, and users can not remain at any time is 350w of power, so the annual savings FSP how much more pure misleading, just used to promote your money to use the head.

However, here also need to note that "power factor" is not equal to "conversion efficiency." Some businesses now interpret the active 0.99 power factor as a 99% conversion efficiency, which is obviously wrong. Although both describe the concept of power saving, the meaning of the two concepts is different for individuals. PFC "power factor" high is for the country to save money, and "conversion efficiency" high is to save money for users.