Blog's of NmChisty

Experiment No: Experiment Name: Construction and Testing of a Step-Down DC Chopper Circuit   Aim / Objective: ·        To construct and test a step-down (buck) DC chopper circuit. ·        To study the variation of output voltage with duty cycle. ·        To verify the operation of the buck converter in stepping down voltage.   Theory: A step-down DC chopper, also called a buck converter , converts a higher DC input voltage to a lower DC output voltage by rapidly switching a semiconductor device ON and OFF. The output voltage is controlled by the duty cycle D D D of the switching signal. ·        When the switch is ON , the input voltage is applied across the load and inductor, storing energy in the inductor. ·        When the switch is OFF , the inductor releases energy to the load through the freewheeling dio...

Experiment No: Experiment Name: Construction and Testing of a Step-Up DC Chopper Circuit Aim: To design, construct, and test a step-up (boost) DC-DC converter and verify the effect of varying the duty cycle on the output voltage. Theory: A step-up chopper , also known as a boost converter , is a type of DC-DC converter used to increase (boost) a lower DC input voltage to a higher output voltage. It works on the principle of energy storage in an inductor and controlled switching using a semiconductor device like a MOSFET. Switch ON : Current flows through the inductor and stores energy in its magnetic field. Switch OFF : The inductor opposes the sudden drop in current by reversing polarity, forcing current through the diode to the load, thereby boosting the voltage. The output voltage is always greater than the input voltage. The amount of voltage boost depends on the duty cycle (D) of the PWM signal.         Vo...