What is the difference between synchronous rectification and PFC

PFC is the meaning of "power factor", mainly used to characterize the efficiency of electronic products on the use of electrical energy. The higher the power factor, the more efficient the utilization of electrical energy. Synchronous rectification is the use of very low pass-state resistance of the special power MOSFET, to replace the rectifier diode in order to reduce the rectification loss of a new technology. It can greatly improve the efficiency of the converter and does not exist by the Schottky barrier voltage caused by the dead zone voltage. Power MOSFET belongs to the voltage control device, it is in the on-time volt-ampere characteristic is linear. When using a power MOSFET as a rectifier, the gate voltage must be synchronized with the phase of the rectified voltage in order to complete the rectification function, so it is called synchronous rectification.

The traditional rectifier technology is similar to a door that must be pushed open by someone with great force, so the current through the door each time a huge effort, a sweat, and the loss of nature is also a lot.

And synchronous rectification technology is a bit similar to the more upscale places we pass through the sensor door: it seems to be closed, but you need to pass when you come to it, it will open up on its own, do not have to push yourself hard, so naturally there is no loss.