The full English name of PFC is “Power Pupply Correction”, which means “power factor correction”. Power factor refers to the relationship between effective power and total power consumption (apparent power), that is, effective power divided by total power consumption The ratio of the amount (apparent power). Basically, the power factor can measure the extent to which electricity is effectively used. The larger the power factor value, the higher the power utilization rate. Power factor is a parameter used to measure the power efficiency of electrical equipment, and low power factor represents low power efficiency. The technology to improve the power factor of the equipment is called power factor correction.
The computer switching power supply is a capacitive input circuit, and the phase difference between its current and voltage will cause the loss of exchange power. At this time, a PFC circuit is needed to improve the power factor. Only in this way can the efficiency of the switching power supply be maximized.
In the PFC switching power supply, the switching stable power supply is a very important part. The switching stabilized power supply function in the PFC is not much different from the ordinary switching stabilized power supply, but there is a difference in power supply. Ordinary switching stabilized power supply requires 220V rectified power supply, while PFC stabilized switching power supply has B+PFC power supply. In this way, the filtering effect will be better, and it will have the advantage of lower requirements for the Houji PWM switch tube.
Post time: Jun-29-2021