can some one tell me how the microcontroller can control the power mosfet as a switching

 

can some one tell me how the microcontroller can control the power mosfet as a switching

its simple just Google the staff. what you can do is to set up the pin high that would activate the gate.

 

since the gate of the mosfet is receive the current pulse , how the microncontroller send the current pulse?

second question is that power mosfet can act as a SPDT switch? how the schematic look like?

 

just use a transistor ,there is nothing to it at all, any npn u can find, or general purpose.

 

You can use a LOGIC LEVEL MOSFET.

This will accept standard logic levels on the gate. They work quite well with micros.

 

but if using the transistor, the switching speed is lower than the switching speed of power mosfet. how to solve the problem?

Is that the transistor can works as a SDPT switch

 

A Single Double Pole Throw switch?

How fast switching do you need?

FETS are pretty fast these days, and unless you have a 20+MHz microcontroller, you should be able to switch a MOSFET just fine.

Have a read here for high speed MOSFET driving drivers
http://www.analog.com/en/press-release/11_19_09_MOSFET_Drivers_Improve_Efficiency/press.html