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university:labs:comms_lab_transformers_adalm2000 [18 May 2020 17:56] – ↷ Page moved and renamed from university:labs:m2k:comms_lab_transformers to university:labs:comms_lab_transformers_adalm2000 Cristina Suteuuniversity:labs:comms_lab_transformers_adalm2000 [18 May 2020 18:00] – media files from current location Cristina Suteu
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 The transformer core has high magnetic permeability, i.e. a material that forms a magnetic field much more easily than in free space, due to the orientation of atomic dipoles. In figure 1, the core is made of laminated soft iron but at higher frequencies ferrite is more common. The result is that the magnetic field is concentrated inside the core, and almost no field lines leave the core.  The transformer core has high magnetic permeability, i.e. a material that forms a magnetic field much more easily than in free space, due to the orientation of atomic dipoles. In figure 1, the core is made of laminated soft iron but at higher frequencies ferrite is more common. The result is that the magnetic field is concentrated inside the core, and almost no field lines leave the core. 
  
-{{ :university:courses:electronics:atrans_f1.png?500 |}}+{{ :university:labs:atrans_f1.png?500 |}}
  
 <WRAP centeralign> Figure 1 Simple Transformer </WRAP> <WRAP centeralign> Figure 1 Simple Transformer </WRAP>
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 I<sub>rms</sub> = I<sub>rmstable</sub> × W<sub>N</sub> I<sub>rms</sub> = I<sub>rmstable</sub> × W<sub>N</sub>
  
-====Pre Lab Simulations====+====Pre Lab Simulaations====
  
 Before measuring the frequency response of the transformers supplied in your parts kit, create a simulation schematic similar to figure 2 and perform an AC sweep from 10 KHz to 10 MHz. Use the manufacturer's datasheet to set the values for the winding inductance ( mutual inductance for an ideal transformer ) and resistance. Assume that the coupling factor is 1. For this analysis we will assume that the parasitic turn to turn capacitance is small enough to ignore. Before measuring the frequency response of the transformers supplied in your parts kit, create a simulation schematic similar to figure 2 and perform an AC sweep from 10 KHz to 10 MHz. Use the manufacturer's datasheet to set the values for the winding inductance ( mutual inductance for an ideal transformer ) and resistance. Assume that the coupling factor is 1. For this analysis we will assume that the parasitic turn to turn capacitance is small enough to ignore.
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 Build the circuit shown in figure 2 on your solder-less breadboard. You will be using this setup to measure the frequency response of each of the two transformer model numbers in three different configuration with 1:1 primary to secondary turns ratios. The two red arrows indicate where to connect the source and load resistors for the configuration where one coil is used for the primary and secondary. The blue arrows are for the configuration where two coils in series are used for the primary and secondary. The green arrows are for the configuration where three coils in series are used for the primary and secondary. Build the circuit shown in figure 2 on your solder-less breadboard. You will be using this setup to measure the frequency response of each of the two transformer model numbers in three different configuration with 1:1 primary to secondary turns ratios. The two red arrows indicate where to connect the source and load resistors for the configuration where one coil is used for the primary and secondary. The blue arrows are for the configuration where two coils in series are used for the primary and secondary. The green arrows are for the configuration where three coils in series are used for the primary and secondary.
  
-{{ :university:courses:electronics:atrans_f2.png?500 |}}+{{ :university:labs:atrans_f2.png?500 |}}
  
 <WRAP centeralign> Figure 2, transformer test circuit </WRAP> <WRAP centeralign> Figure 2, transformer test circuit </WRAP>
  
 =====Hardware Setup:===== =====Hardware Setup:=====
-{{ :university:courses:electronics:atrans_nf3.png? |}}+{{ :university:labs:atrans_nf3.png? |}}
  
 <WRAP centeralign> Figure 3, transformer test circuit breadboard connection </WRAP> <WRAP centeralign> Figure 3, transformer test circuit breadboard connection </WRAP>
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 =====Procedure:===== =====Procedure:=====
-{{ :university:courses:electronics:atrans_nf4.png?500 |}}+{{ :university:labs:atrans_nf4.png?500 |}}
  
 <WRAP centeralign> Figure 4, Three coils in series configuration (green arrow), Scopy plot </WRAP> <WRAP centeralign> Figure 4, Three coils in series configuration (green arrow), Scopy plot </WRAP>
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 Connect to the transformer for a 1:2 step up configuration (red arrows) and a 2:1 step down configuration as shown in figure 3. Connect to the transformer for a 1:2 step up configuration (red arrows) and a 2:1 step down configuration as shown in figure 3.
  
-{{ :university:courses:electronics:atrans_f3.png?500 |}}+{{ :university:labs:atrans_f3.png?500 |}}
  
 <WRAP centeralign> Figure 5 Step Up (red) and Step Down (blue) connections </WRAP> <WRAP centeralign> Figure 5 Step Up (red) and Step Down (blue) connections </WRAP>
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 Use the impedance matching formula to calculate the appropriate value for R<sub>L</sub> in both cases. Repeat the same frequency sweeps using the Network Analyzer tool. Be sure to export the data to a .csv file for further analysis in either Excel or Matlab. Compare the measured low frequency roll off points with those measures in the 1:1 configurations from figure 2. Use the impedance matching formula to calculate the appropriate value for R<sub>L</sub> in both cases. Repeat the same frequency sweeps using the Network Analyzer tool. Be sure to export the data to a .csv file for further analysis in either Excel or Matlab. Compare the measured low frequency roll off points with those measures in the 1:1 configurations from figure 2.
 =====Hardware Setup:===== =====Hardware Setup:=====
-{{ :university:courses:electronics:atrans_nf6.png |}}+{{ :university:labs:atrans_nf6.png |}}
  
 <WRAP centeralign> Figure 6, Step up (red) breadboard connection </WRAP> <WRAP centeralign> Figure 6, Step up (red) breadboard connection </WRAP>
 =====Procedure:===== =====Procedure:=====
-{{ :university:courses:electronics:atrans_nf7.png?500 |}}+{{ :university:labs:atrans_nf7.png?500 |}}
  
 <WRAP centeralign> Figure 7, Step up (red), Scopy plot </WRAP> <WRAP centeralign> Figure 7, Step up (red), Scopy plot </WRAP>
university/labs/comms_lab_transformers_adalm2000.txt · Last modified: 26 Aug 2022 19:22 by Doug Mercer

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