buck converter circuit with mosfet Pic Microcontroller in Proteus

Hello fellow! Welcome with us in new topic which is about buck converter circuit with mosfet Pic Microcontroller in Proteus. So let’s begin with today’s topic.

BUCK CONVERTER Using Pic Microcontroller

        Buck converter is non isolated converter which is used to step down the voltage. It is actually served  the purpose ofstep down the DC transformer. Buck converter is used only for low power applications due to some reasons of efficiency issues inductor size and capacitor size. In this picture there are two modes. The one is ON and the other side is OFF. When the switch ON the supply voltage will flow current from this loop and the partial current will flow from this capacitor and inductor will charge by Polarity.
[otw_is sidebar=otw-sidebar-1] On the other hand when the switch off the charge energy in the inductor that inductor will reverse its polarity. After this the inductor will release its energy thought the load. The current will pass from resistor, and also both capacitor and diode.


In short we can say that when switch is ON the inductor will store its energy with positive polarity. When the switch is OFF the inductor will release its energy by changing its polarity.


Let start the project on Protues



 For build this circuit we have to use these components.

  • Resistor
  • Diode
  • Capacitor
  • Inductor
  • Microcontroller
  • IR2101
  • MOSFET Driver

A resistor is a substance which opposes the flow of electron through it. The SI unit of resistor is ohm. It is represent by R . The formula is V=IR. V potential, I current and R resistance.





            A diode is a device in which the current is flow only in one direction. The current is flowing from anode to cathode. As you see in the picture. The SI unit of diode is Volt.




         A capacitor is act as a battery. It can store energy in it. The energy is in the form of electrical charges. The SI unit of capacitor is Farad.





         An inductor is also called a coil. It is an electrical component that stores energy in a form of magnetic field when electric current pass through it.  The SI unit of inductor is Henry (H).     di/dt=0   




         The word Microcontroller is composed of two terms micro and controller. ‘Micro’ means very small in size. The word ‘controller’ means a device which controls the operations of all the devices. So we can say that microcontroller has the ability to control any device and also small in size. Microcontroller consists of various components. Microcontroller has built-in RAM, ROM, serial input output ports, peripheral devices, timer, counters, clock circuit etc. Microcontroller generally consists of all these devices.






         The IR2101 are high voltage. MOSFET drivers with high and low side output. The highest off set volt is 600V. The gate supply range from 10 to 20V.  The logic input is from 3.3v.

iR2101 pins Description

Vcc =Low side and logic fixed supply voltage

Vs= High side floating supply offset voltage

Hin= High side gate driver output

HO= High side gate drive output

Lin= Low side gate driver output

LO = Low side gate drive output

COM= Low side return

MOSFET Driver:

         The MOSFET (metal oxide semiconductor field effect transistor) is a transistor which used for switching electronic signals.  MOSFETs are having high switching up to 100 khz. The controller current is dependent on the base current hence the current is highly dependent on the junction temperature.  MOSFETs are comprised of n channel and p channel but they are arranged in different style


I will tell you about the waveform which is display on the oscilloscope. So the first yellow shows the high side logic signal. Second blue wave shows the low side logic signal. Third pink wave describe the output of the low side and then the fourth drain signal of the low side MOSFET. As you can see that by using buck converter we can easily shows our signal in the form of wave by using oscilloscope.


                  Hope you enjoyed this project & stay connected for upcoming new topics.