The full name of MOSFET is "Metal Oxide Semiconductor Field Effect Transistor)  
 
In order to reduce the losses caused by the renewal current on the parasitic diode, MOSFET is used as a inverter element in some applications. Because the MOFSET has the characteristics of low diversion impedance and the current can flow in two -way flow. When the M1 is turned off, when entering the renewal stage, the M 2 is turned on to make the current flow through M2. For example, when the current current is 10A, the MOSFET drive resistance is 10MΩ, and the D2 voltage drops of the diode 0.7V, if the current current flows through the D2, the loss is 7W, and the loss of the loss when the MOSFET flows through the MOSFET, so this uses this. The control method can reduce losses, improve the efficiency of the inverter, and the effect is more obvious when the continuous current is large. This control method is also called synchronous rectification.  
 
The MOSFET tube is a type of FET (the other is JFET), which can be made into an enhanced or exhaustive type. There are 4 types of P -channel or N channel, but the actual application is only the enhanced N -channel MOS The pipe and enhanced P -channel MOS tube, so NMOS, or PMOS refers to these two types.  
 
MOSFET can be divided into MOSFETs of N-Channel and P-Channel, which can be divided into NMOSFET and PMOSFETs.