SIMULATION OF A SERIES RESONANT CIRCUIT ECE562: Power Electronics I COLORADO STATE UNIVERSITY. Modified in Fall 2011
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1 SIMULATION OF A SERIES RESONANT CIRCUIT ECE562: Power Electronics I COLORADO STATE UNIVERSITY Modified in Fall 2011 ECE 562 Series Resonant Circuit (NL5 Simulation) Page 1
2 PURPOSE: The purpose of this lab is to simulate the series resonant circuit using MATLAB and NL5 to better familiarize the student with some of its operating characteristics. This lab will explore some of the following aspects of the series 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 resistance (R) NOTE: The simulations that follow are intended to be completed with NL5. It is assumed that the student has a fundamental understanding of the operation of NL5. Build the schematic shown in Figure A. Vm is an AC voltage source. Set the type to Sin, and the magnitude to 1 volt. L1 is an ideal inductor. Set to 1000µH. R is an ideal resistor. Set to 200 Ω. C1 is an ideal capacitor. Set to 40pF. Figure A Initial schematic. ECE 562 Series Resonant Circuit (NL5 Simulation) Page 2
3 Under the AC Settings tab, specify V1 as the source, a frequency range of 100 Hz to 10 MHz, 1000 points, and a logarithmic scale. Add a trace for the input impedance by selecting AC / Data / Traces from the menu. Click on Function in the Add new trace section. Add the function V(V1)/I(V1). ECE 562 Series Resonant Circuit (NL5 Simulation) Page 3
4 Run the simulation by selecting AC and then Start from the drop down menus. Figure B Magnitude and phase of the input impedance. Referring to Figure B, what is the input impedance value of RLC circuit? Next, we want to measure the total inductor current of RLC series resonance circuit. Right click on the inductor, and select Add trace / current. Re-run the simulation and adjust the display to show the data of interest. Figure C Inductor current. What is the value of the inductor current? Describe the phase characteristics of the inductor current. ECE 562 Series Resonant Circuit (NL5 Simulation) Page 4
5 Next, we want to simulate the input impedance of series RLC resonant circuit with a varying resistor. Use the same circuit as above, but change the resistor values to 50, 100, 200, 400, 2000, 4000, and 8000 Ω. This type of parametric sweep is accomplished in NL5 with a script. Go to Tools / Script and click on the Sweep tab. Select List instead of Loop. Enter R1 as the Name, enter the parametric values in the box, and select AC sweep. Click on the blue arrow to start the script. What is the input impedance value of RLC circuit with varying resistances? Figure D Input impedance values of the RLC circuit. ECE 562 Series Resonant Circuit (NL5 Simulation) Page 5
6 Next, we want to simulate the inductor current of series RLC resonant circuit with varying resistance values. Figure E Inductor current for varying resistor values. What is the value of the inductor current? Describe the phase characteristics of the inductor current. Next, simulate the output voltage as a function of varying resistance. For this example, take the voltage across the capacitor as the output voltage. ECE 562 Series Resonant Circuit (NL5 Simulation) Page 6
7 Figure F Output voltage for varying resistor values. What is the value of the output voltage? Describe the phase characteristics of the output voltage. ECE 562 Series Resonant Circuit (NL5 Simulation) Page 7
8 For Homework: You need to re-solve the parallel resonant circuit with Capacitor ESR and see its effects on the magnitude and phase plots in some detail. For example choose the ratio of the C ESR to the load resistance to be in the ratio range from 0.01 to 1. Series 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. 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 series RLC resonant circuit as shown in Figure 1. Vm is a variable voltage. Set to 1 volts L is a variable inductor. Set to 1000µH. R is a variable ideal resistor. Set to 200Ω. C is a variable ideal capacitor. Set to 40pF. Page 8 of 33
9 Page 9 of 33
10 Figure 1: The input impedance of series RLC tank circuit. Once the above m file is captured, the simulations can be run. First, go to your directory. Find your m file and then run your file. If there is a red message on Page 10 of 33
11 your MATLAB window, then you need to correct your error. Otherwise, you will see the solution as show in figure 2. Page 11 of 33
12 Figure2: The output of input impedance of series RLC tank circuit. Next, plot the total input of the series resonant RLC tank circuit. Write another function to calculate the total input current of series RLC tank circuit as shown in Figure 3. All the initial variables and values are remained the same. Vm is a variable voltage. Set to 1 volts L is a variable inductor. Set to 1000µH. R is a variable ideal resistor. Set to 200Ω. C is a variable ideal capacitor. Set to 40pF Page 12 of 33
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 33
14 Page 14 of 33
15 Figure 4: the output and plot of the total input current of series RLC tank circuit Now write a function to varying R of the input impedance of series RLC resonant circuit by adding an array of Resistors (R) value. Again all the initial variables and values are remain the same. Vm is a variable voltage. Set to 1 volts L is a variable inductor. Set to 1000µH. R is a variable ideal resistor. Set to 200Ω. Page 15 of 33
16 C is a variable ideal capacitor. Set to 40pF Write a loop function to do the varying resistors value, calculate and plot the output of total input impedance of series RLC resonant circuit. When the function to varying R of the input impedance of series 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 33
17 Figure 5: A function of the input impedance of series RLC resonant circuit with varying Resistor Page 17 of 33
18 Figure 6: Output of the input impedance of series RLC resonant circuit with varying Resistor Now write a function to varying R of the input current of series RLC resonant circuit by adding an array of Resistors (R) value. Again all the initial variables and values are remain the same. Vm is a variable voltage. Set to 1 volts L is a variable inductor. Set to 1000µH. R is a variable ideal resistor. Set to 200Ω. C is a variable ideal capacitor. Set to 40pF Write a loop function to do the varying resistors value, calculate and plot the output of total input current of series RLC resonant circuit. When the function to varying R of the input current of series 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 18 of 33
19 Figure 7: A function of the input current of series RLC resonant circuit with varying Resistor Page 19 of 33
20 Page 20 of 33
21 Figure 8: Output of the input current of series RLC resonant circuit with varying Resistor Page 21 of 33
22 Now write a function to varying R of the output voltage of series RLC resonant circuit by adding an array of Resistors (R) value. Again all the initial variables and values are remain the same. Vm is a variable voltage. Set to 1 volts L is a variable inductor. Set to 1000µH. R is a variable ideal resistor. Set to 200Ω. C is a variable ideal capacitor. Set to 40pF Write a loop function to do the varying resistors value, calculate and plot the output voltage of series RLC resonant circuit. When the function to varying R of the input current of series 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 22 of 33
23 Figure 9: A function of the output voltage of series RLC resonant circuit with varying Resistor Page 23 of 33
24 Figure 10: This figure is shown the output voltage of series RLC resonant circuit with varying Resistor Page 24 of 33
25 For Homework: You need to re-solve the parallel resonant circuit with Capacitor ESR and see its effects on the magnitude and phase plots in some detail. For example choose the ratio of the C ESR to the load resistance to be in the ratio range from 0.01 to 1. Now write m file to varying R of the natural response of current in series RLC resonant circuit by adding an array of Resistors (R) value. Again all the initial variables are remain the same but change their values. Vm is a variable voltage. Set to 0 volts L is a variable inductor. Set to 5mH. R is a variable ideal resistor. Set to 8Ω. C is a variable ideal capacitor. Set to 200µF Io is a variable ideal of inductor current. Set to 2 amps. Vo is a variable ideal of capacitor voltage. Set to -5 volts. Write a loop function to do the varying resistors value, calculate and plot the natural response of current for series RLC resonant circuit. When the function to varying R of the natural response of current in series 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 25 of 33
26 Page 26 of 33
27 Figure 11: the m file to calculate and plot the natural response of current in series RLC resonant circuit with varying Resistor Page 27 of 33
28 Figure 12: This figure is shown the output of the natural responses of current in series RLC resonant circuit with varying Resistor Now write m file to varying R of the natural response of capacitor voltage in a series RLC resonant circuit by adding an array of Resistors (R) value. Again all the initial variables are remain the same but change their values. Vm is a variable voltage. Set to 0 volts L is a variable inductor. Set to 5mH. R is a variable ideal resistor. Set to 8Ω. C is a variable ideal capacitor. Set to 200µF Page 28 of 33
29 Io is a variable ideal of inductor current. Set to 2 amps. Vo is a variable ideal of capacitor voltage. Set to -5 volts. Write a loop function to do the varying resistors value, calculate and plot the natural response of capacitor voltage in a series RLC resonant circuit. When the function to varying R of the natural response of series 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 29 of 33
30 Page 30 of 33
31 Figure 13: the m file to calculate and plot the natural response of current in a series RLC resonant circuit with varying Resistor Page 31 of 33
32 Page 32 of 33
33 Figure 14: the output of the natural response of capacitor voltage in a series RLC resonant circuit with varying Resistor Page 33 of 33
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