PFC is the meaning of power factor correction, which is mainly used to characterize the utilization efficiency of electric energy by electronic products. The higher the power factor, the higher the utilization efficiency of electric energy.
There are two types of PFC: passive PFC and active PFC. Passive PFC generally adopts inductance compensation method to reduce the phase difference between the fundamental current and voltage of AC input to improve the power factor, but the power factor of passive PFC is not very high and can only reach 0.7 ~ 0.8; Active PFC is composed of inductance, capacitance and electronic components,it can reach up to 0.99. It is small and can achieve high power factor, but the cost is higher than that of passive PFC.
PFC is often used as the active power supply in PC, and PFC has the following characteristics at least:
1) The input voltage can be from 90V to 270V;
2) The line power factor is higher than 0.98, and has the advantages of low loss and high reliability;
3) The PFC of IC can also be used as auxiliary power supply, so the standby transformer is often not required in the use of active PFC circuit;
4) The output does not fluctuate with the input voltage, so a highly stable output voltage can be obtained;
5) The output DC voltage ripple of active PFC is very small and presents a sine wave of 100Hz / 120Hz (twice the power frequency). Therefore, the power supply using active PFC does not need to use a large capacity filter capacitor.
Active PFC is composed of inductance, capacitance and electronic components. It has small volume. It adjusts the current waveform through special IC to compensate the phase difference between current and voltage. Active PFC can achieve high power factor – usually more than 98%, but the cost is also relatively high. In addition, the active PFC can also be used as an auxiliary power supply. Therefore, in the use of the active PFC circuit, the standby transformer is often not required, and the ripple of the output DC voltage of the active PFC is very small. This power supply does not need to use a large capacity filter capacitor.
We have recently launched 2000W and 3000W switching power supplies with PFC. The price is very advantageous. It is much cheaper than the same power supply on the market, and the performance is very stable. If you are interested in it, please contact us. Thank you!
Post time: Mar-11-2022