TIDT367 December   2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Test Setup
      1. 1.3.1 Hardware Setup
      2. 1.3.2 Software Setup
    4. 1.4 Running the Code for Different Labs
      1. 1.4.1 Lab 1. Primary to Secondary Power Flow, Open Loop Check PWM Driver
      2. 1.4.2 Lab 2. Primary to Secondary Power Flow, Open Loop CheckPWM Driver and ADC With Protection
      3. 1.4.3 Lab 3. Primary to Secondary Power Flow, Closed Voltage Loop Check
      4. 1.4.4 Lab 4. Primary to Secondary Power Flow, Closed Current Loop Check
      5. 1.4.5 Lab 6. Secondary to Primary Power Flow, Open Loop Check PWM Driver
      6. 1.4.6 Lab 7. Secondary to Primary Power Flow, Open Loop Check PWM Driver and ADC With Protection
      7. 1.4.7 Lab 8. Secondary to Primary Power Flow, Closed Voltage Loop Check
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
    4. 2.4 Bode Plots
  7. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Load Transients
    3. 3.3 Start-Up Sequence
    4. 3.4 Dynamic Response
    5. 3.5 Mode Transition

1.4.3 Lab 3. Primary to Secondary Power Flow, Closed Voltage Loop Check

In this lab, the voltage loop Gv , is closed with an electrical load (constant current mode) at the output.

  1. Run the project by clicking the Resume button in Tool Bar
  2. Set the load current below 20 A during start up
  3. Increase the input PRIM DC voltage from 0 V to 400 V
  4. Clear the trip by writing "1" to the CLLLC_start variable in the watch window as shown in Figure 1-4, this closes the voltage loop and the converter performs soft-start until the output voltage ramps up to 48 V
  5. Next, test the close loop operation by varying CLLC_vSecRef_Volts in the watch window with different load conditions