Buck Regulator Half-Bridge PWM Operation

In this lab, students investigate the behavior of MOSFETs when configured as a half-bridge in PWM operation. This circuit element is used in switching power supply applications for high-efficiency DC-DC voltage conversion.
by Dr. Nicola Femia | University of Salerno, and Texas Instruments

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This is lab 5 of 12 in the course, Power Electronics.


After completing this lab, students will be able to:
  1. Given a MOSFET half-bridge, a PWM modulator, a source voltage, and a load resistance, you will calculate the PWM control voltage required to achieve a desired output voltage and the conversion efficiency of the half-bridge in different operating conditions, with specified units and accuracy.
  2. Given a MOSFET half-bridge, a PWM modulator with a triangular carrier signal and a DC control voltage, you will simulate the half-bridge behavior to verify the consistency of theoretical predictions, by comparing the simulated and the calculated output voltage under the same source voltage and a load resistance conditions.
  3. Given a real MOSFET half-bridge, a PWM modulator, a DC power supply, a load resistor, and a two channel function generator, you will determine the PWM control voltage needed to achieve a desired output voltage, the duty-cycle, the efficiency and the MOSFET on-state resistance, with specified units and accuracy.


  • Basic proficiency using Multisim Live
  • Basic proficiency using ELVIS III Instruments
  • Basic proficiency in circuits and analog electronics


Engineering laboratory solution for project-based learning that combines instrumentation and embedded design with a web-driven experience, delivering a greater understanding of engineering fundamentals and system design.

TI Power Electronics Board for NI ELVIS III

Application board for NI ELVIS III which provides a hands-on approach to power electronics using functional blocks and TI circuits to understand each component in a power electronics system.

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