Analysis and Design of Power Electronic Circuits using Orcad Professor Babak Fahimi, PhDDirector, Power Electronics and Controlled Motion LaboratoryUniversity of Texas at Arlington

Getting started with PSpiceTo start with a PSpice project:Go to capture CIS Lite Edition Go to File menu. Select New Project option. Choose analog or mixed A/D option and specify the project name and its location and click Ok

Once the step 3) is completed the following window appears. Choose Create a blank project option

Create the circuit by placing all its parts using Part option from Part menu. In this way a complete electrical circuit can be formed.

Points to rememberWhen creating a new project , use Analog or Mixed A/D set-up option.Watch the file location / directory structure.

Design and simulation of power electronic circuits Power Electronic Circuits can be classified as: DC-DC Converters AC-DC Converters (Rectifiers)DC-AC Converters (Inverters)AC-AC Converters

Now design and simulation of each of these circuits will be discussed.

AC-DC Converters (Rectifiers)AC-DC converters ( Rectifiers) can be classified as:Half wave rectifier Full wave rectifier

These can further be classified depending upon the rectifying element being used . If using diode, are called uncontrolled rectifiers. Whereas if using thyristor, are called controlled rectifiers.

Half Wave Uncontrolled Rectifiera) For Resistive LoadMake the circuit in PSpice using steps mentioned earlier. Components used are:VSin (voltage source)DIN4002 (diode)R (Resistance)GND_SIGNAL/CAPSYM.

Make the simulation profile using New Simulation Profile command from PSpice menu.

Go to Edit Simulation Profile in PSpice menu, simulation settings window will open. Go to Analysis and set the simulation parameters as shown below.

Run the simulation by using command RUN from PSpice menu.

Get plots for IR1(resistance current), RMS value of IR1 and V1(input voltage) using Add Trace command from Trace menu

Plot the resistance current and then use Fourier command from Trace menu to get the frequency response of the resistance current.

Half Wave Uncontrolled Rectifier b) For RL LoadCreate another page under same schematic and make the circuit using same steps. Components used are:VSin (voltage source)DIN4002 (diode)R (Resistance)L ( Inductor)GND_SIGNAL/CAPSYM

Now simulate the circuit using same steps and get plots for resistance current and input voltage.

Half Wave Uncontrolled Rectifierc) For RC LoadCreate another page under same schematic and make the circuit using same steps. Components used are:VSin (voltage source)DIN4002 (diode)R (Resistance)C ( Capacitor)GND_SIGNAL/CAPSYM

Now simulate the circuit using same steps and get plots for resistance current and capacitor voltage.

Half Wave Uncontrolled Rectifierd) For RL load with freewheeling diodeCreate another page under same schematic and make the circuit using same steps. Components used are:VSin (voltage source)DIN4002 (diode)R (Resistance)L ( Inductor)GND_SIGNAL/CAPSYM

Now simulate the circuit using same steps and get plots for resistance current , RMS value of resistance current and input voltage.

Half Wave Controlled RectifierFor type (1) connectionsMake the circuit using same steps. Components used are:VSin (voltage source)VPULSE (voltage source)2N1595 (Thyristor)R (Resistance)GND_SIGNAL/CAPSYM

Now simulate the circuit and get plots for resistance current.

Half Wave Controlled RectifierFor type (2) connections (a) with zero time delay in gate pulseMake the circuit using same steps. Components used are:VSin (voltage source)VPULSE (voltage source)2N1595 (Thyristor)R (Resistance)GND_SIGNAL/CAPSYM

Now simulate the circuit and get plots for resistance current and input voltage.

Half Wave Controlled RectifierFor type (2) connections (b) with 4.1667ms time delay in gate pulseMake the circuit using same steps. Components used are:VSin (voltage source)VPULSE (voltage source)2N1595 (Thyristor)R (Resistance)GND_SIGNAL/CAPSYM

Now simulate the circuit and get plots for resistance current and input voltage.

Full Wave Uncontrolled Rectifier Full wave uncontrolled rectifier can be :Single phaseThree phase

Single Phase Full Wave RectifierMake the circuit as shown:

Simulate the circuit and get plots for all diode currents.

Three Phase Full Wave RectifierMake the circuit as shown:

Simulate the circuit and get plots for all diode currents.

Points to rememberIn order to simulate the circuit signal reference must be named 0 ( the number zero)