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

2.3 Thermal Images

The thermal test setup is illustrated in Figure 2-3.

The setup includes forced air using 3 × 12-V fans (Delta PFR0612XHE, operated at 12 V), blowing the secondary-side metal-oxide semiconductor field-effect transistors (MOSFETs), and with that, tests are carried out up to 3 kW across the rated load and voltage for the design.

GUID-20231204-SS0I-TNBD-XGTK-QN7GMGTPZHFV-low.jpg Figure 2-3 Thermal Test Setup Overview

Thermal images and information is shown in the following figures.


GUID-20231201-SS0I-LMFF-41Z0-G6RJ6TCTVM0S-low.jpg

Primary side field-effect transistors (FETs) Secondary side FETs
Figure 2-4 Thermal Image of the Board Running at 3 kW, Vprim 400 V, Vsec 48 V, Charging Mode
GUID-20231121-SS0I-HGZQ-KXZC-HBHCQJHXR6RZ-low.jpg
CH1: Secondary winding, CH2: Primary winding, CH3: Core
Figure 2-5 Transformer Temperature (Without Heat Sink)

GUID-20231201-SS0I-WPTW-HQGH-PP8XKCVFR24X-low.jpg

Primary side FETsSecondary side FETs
Figure 2-6 Thermal Image of the Board Running at 2 kW, Vprim 400 V, Vsec 48 V, Discharging Mode