SIMULATIONS OF PARALLEL RESONANT CIRCUIT POWER ELECTRONICS COLORADO STATE UNIVERSITY

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1 SIMULATIONS OF PARALLEL RESONANT CIRCUIT POWER ELECTRONICS COLORADO STATE UNIVERSITY Page 1 of 25

2 PURPOSE: The purpose of this lab is to simulate the LCC circuit using MATLAB and ORCAD Capture CIS to better familiarize the student with some of its operating characteristics. This lab will explore some of the following aspects of the Parallel Resonant circuit: Input impedance Magnitude and phase margin Zero frequency Output power Output current Plot the natural response for the output voltage Zero poles Phase of transfer function Input impedance for varying loads resistance (R) Parallel Resonant circuit Using PSPICE NOTE: The simulations that follow are intended to be completed with ORCAD Capture CIS. It is assumed that the student has a fundamental understanding of the operation of ORCAD Capture CIS. ORCAD Capture CIS provides tutorials for users that are not experienced with its functions. PROCEDURE: Part 1: Build the schematic shown in Figure 1. Im is an AC current source (IAC) from the source library. It needs to be set for Amp. L1 is an ideal inductor from the Analog Library. Set for 0.1H. R is an ideal resistor from the Analog Library. Set for 20k. C5 is an ideal capacitor from the Analog library. Change the value to 100nF. Page 2 of 25

3 Figure 1 Use the student version of ORCAD Capture CIS that is installed on CSU computer lab to simulation the given circuit above. Here are the steps: 1. Draw the circuit given above 2. Apply the IAC, because we want to plot the frequency response 3. Set ACMAG =0.001 in IAC 4. Do analysis setup a. On the ORCAD Capture CIS menu select new simulation profile b. Choose AC Sweep/Noise in the Analysis type menu c. Set the Start Frequency at 100, the End Frequency at 10Meg and the Points/Decade at 101 d. Make sure Logarithmic is selected and set to Decade e. Click OK Page 3 of 25

4 The figure below is the result of input impedance of Parallel circuit. What is the input impedance value of parallel circuit? Next, we want to run the simulation of the output voltage of the parallel circuit. Use the same circuit as above and place the db magnitude of voltage marker and the phase of voltage marker in series next to output capacitor. (Note: Markers are in the PSpice menu) The figure below is the result of output voltage of parallel circuit. What is the value of output voltage of the parallel circuit? What is the phase value of output voltage of parallel circuit? Page 4 of 25

5 Next, we want to run the simulation of the input impedance of the series parallel resonant circuit with varying resistors value. Use the same circuit as above, and change the resistor values. Resistor values are: 5k, 10k, 20k, 40k, 200k, 400k, and 800k Ohms. To enter in these values go to Edit Simulation Setting under the Pspice menu. Under Analysis, select parametric sweep, select global parameter, and value list. Place your values in the slot for value list. Page 5 of 25

6 The figure below is the result of input impedance of series Parallel tank circuit. What are the input impedance values of parallel circuit? Next, we want to measure the output voltage of the series parallel resonant circuit with varying resistors value. Use the same circuit as above, place the db magnitude of voltage marker and the phase of voltage marker in series next to output capacitor, and change the resistor values. These markers are located on the Pspice menu. Resistor values are: 5k, 10k, 20k, 40k, 200k, 400k, and 800k Ohms. The figure below is the result of output voltage of Parallel circuit. What are the output voltage values of parallel circuit with varying the resistor values? What are the values of the phase output voltage of parallel circuit with varying the resistor values? Page 6 of 25

7 For Homework: You need to re-solve the parallel resonant circuit with inductor ESR and see its effects on the magnitude and phase plots in some detail. For example choose the ratio of the L ESR to the load resistance to be in the ratio range from 0.01 to 1. Page 7 of 25

8 Parallel Resonant circuit using MATLAB NOTE: The simulations that follow are intended to be completed with MATLAB. It is assumed that the student has a fundamental understanding of the operation of MATLAB. MATLAB provides tutorials for users that are not experienced with its functions. In this lab you will learn how to write a function to varying, calculating and plotting the input impedance, current and output voltage of the series RLC resonant tank circuit. Also plot the natural response of the parallel RLC tank circuit. You can define your own function in MATLAB. A function must start with a line. Function return-value = function-name (arguments) So that MATLAB will recognize it as a function. Each function must have its own file and the file must have the same as the function. PROCEDURE: Part 1: Write a function to calculate the total input impedance of parallel RLC resonant circuit as shown in Figure 1. Im is a variable current. Set to amps L is a variable inductor. Set to 0.1H. R is a variable ideal resistor. Set to 20000Ω. C is a variable ideal capacitor. Set to 100nF. Page 8 of 25

9 Page 9 of 25

10 Figure 1: The input impedance of parallel RLC tank circuit. Once the above function file is captured, the simulations can be run. First, go to your directory. Find your function file and then run your file. If there is a red Page 10 of 25

11 message on your MATLAB window, then you need to correct your error. Otherwise, you will see the solution as show in figure 2. Page 11 of 25

12 Figure2: The output of input impedance of parallel RLC tank circuit. Next, plot the output voltage of the parallel resonant RLC tank circuit. Write another function to calculate the output voltage and plot of parallel RLC tank circuit as shown in Figure 3. All the initial variables and values are remain the same. Im is a variable current. Set to amps L is a variable inductor. Set to 0.1H. R is a variable ideal resistor. Set to 20000Ω. C is a variable ideal capacitor. Set to 100nF. Page 12 of 25

13 Figure 3: the function to calculate the total input current of series RLC tank circuit Once the above function file is captured, the simulations can be run. First, go to your directory. Find your function file and then run your file. If there is a red message on your MATLAB window, then you need to correct your error. Otherwise, you will see the solution as show in figure 4. Page 13 of 25

14 Page 14 of 25

15 Figure 4: the output and plot of the output voltage of parallel RLC tank circuit Now write a function to varying R of the output voltage in parallel RLC resonant circuit by adding an array of Resistors (R) value. Again all the initial variables and values are remain the same. Im is a variable current. Set to amps L is a variable inductor. Set to 0.1H. R is a variable ideal resistor. Set to 20000Ω. C is a variable ideal capacitor. Set to 100nF. Page 15 of 25

16 Write a loop function to do the varying resistors value, calculate and plot the output voltage of parallel RLC resonant circuit. When the function to varying R of the output voltage of parallel RLC resonant circuit function file is captured, the simulations can be run. If there is any error message on your MATLAB windows, then correct your error and then rerun the simulation. Otherwise, you will see the result as show below Page 16 of 25

17 Figure 5: A function to calculate and plot of the output voltage in parallel RLC resonant circuit with varying Resistor Page 17 of 25

18 Figure 6: Output voltage of parallel RLC resonant circuit with varying Resistor For Homework: You need to re-solve the parallel resonant circuit with inductor ESR and see its effects on the magnitude and phase plots in some detail. For example choose the ratio of the L ESR to the load resistance to be in the ratio range from 0.01 to 1. Page 18 of 25

19 Next write m file to varying R of the natural response of current in parallel RLC resonant circuit by adding an array of Resistors (R) value. Again all the initial variables are remain the same but change their values. Im is a variable current. Set to 1 volts L is a variable inductor. Set to H. R is a variable ideal resistor. Set to 2000Ω. C is a variable ideal capacitor. Set to 1µF Io is a variable ideal of inductor current. Set to 0 amps. Vo is a variable ideal of capacitor voltage. Set to 0 volts. Write a loop function to do the varying resistors value, calculate and plot the natural response of current for parallel RLC resonant circuit. When the m file to varying R of the natural response of current in parallel RLC resonant circuit file is captured, the simulations can be run. If there is any error message on your MATLAB windows, then correct your error and then rerun the simulation. Otherwise, you will see the result as show below Page 19 of 25

20 Page 20 of 25

21 Figure 11: The m file to calculate and plot the natural response of current in parallel RLC resonant circuit with varying Resistor Page 21 of 25

22 Figure 12: This figure is shown the output of the natural responses of current in parallel RLC resonant circuit with varying Resistor Now write m file to varying R of the natural response of output voltage in a parallel RLC resonant circuit by adding an array of Resistors (R) value. Again all the initial variables are remain the same but change their values. Im is a variable current. Set to 1 volts L is a variable inductor. Set to H. R is a variable ideal resistor. Set to 2000Ω. C is a variable ideal capacitor. Set to 1µF Io is a variable ideal of inductor current. Set to 0 amps. Vo is a variable ideal of capacitor voltage. Set to 0 volts. Write a loop function to do the varying resistors value, calculate and plot the natural response of output voltage in a parallel RLC resonant circuit. When the m file to varying R of the natural response of parallel RLC resonant circuit file is captured, the simulations can be run. If there is any error message on your MATLAB windows, then correct your error and then rerun the simulation. Otherwise, you will see the result as show below Page 22 of 25

23 Page 23 of 25

24 Figure 13: the m file to calculate and plot the natural response of current in a parallel RLC resonant circuit with varying Resistor Page 24 of 25

25 Figure 14: the output of the natural response of capacitor voltage in a parallel RLC resonant circuit with varying Resistor Page 25 of 25

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