Vdc is applied between gate and source terminal. Vdc is converted into Vac at the same amplitude.
MOSFET chopper circuit is shown in the figure. Hereby chopper D.C signal is converted into an A.C signal. MOSFET is also used in the chopper circuit. Simple MOSFET amplifier is shown in the figure. Here input signal is applied between gate ( G) and source ( S ) to generate require gate signal for getting an operating point.An outputt is taken between the drain ( D) and source ( S). For a good amplifying signal we must require to get an operating point for that circuit. The simple amplifying circuit using MOSFET is shown in the figure. Here we take basic enhancement type MOSFET for operation. Hope you understand well about MOSFET switching operation. Protective circuits are used for protecting MOSFET from damage during inductive and capacitive loads. This protective circuits can be anything simple circuits including free wheel diode etc. But is we want to use inductive and capacitive load then we require some external protective circuits. Here we use Lamp as a simple resistive load and use MOSFET as a switch. And MOSFET has a very high switching device. So by this way, we can use MOSFET for switching operation. When the zero voltage level is applied at the gate then the device and lamp is turned off (VGS=0. The voltage is applied at the gate of the MOSFET at that condition the lamp is ON. In this circuit, we are using enhancement mode, an N-channel MOSFET is being used to switch the LED or LAMP for ON and OFF. Here we know the application of MOSFET using Enhancement type MOSFET. In depletion type MOSFET channel is prebuilt and In enhancement type MOSFETĬhannel is made during the operation of MOSFET device.Īlso know – Applications of semiconductor in daily lifeĪs above we saw there are two types of MOSFET. The main difference between depletion type and enhancement type MOSFET is in channel construction. MOSFET are available in generally two types : However, MOSFET require special care in handling and has a problem of electrostatic discharge. So it is used extensively in power electronics. So it has high efficiency than other devices. MOSFET generates very less heat loss compared to BJT at high currents. It also has applications in low power high-frequency converters.Īdvantages of using MOSFET instead of BJT is it does not have the problem of second breakdown phenomena as in BJT. The switching speed of MOSFET is very high and it has switching time in order of nanoseconds.
This MOSFET is used for high-speed switching operations. A power MOSFET is a voltage controlled device. Here gate is isolated from the channel by metal oxide thin layer. It has mainly three terminal – Gate ( G), Drain ( D) and source ( S ). Mosfet is a metal oxide semiconductor device.
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