TIDT369A November   2023  – April 2024

 

  1.   1
  2.   Description
  3.   Features
  4. 1Applications
  5.   Resources
  6. 2System Description
    1. 2.1 System Block Diagram
    2. 2.2 Key System Specification
    3. 2.3 Design Consideration
      1. 2.3.1 Boost Inductor Design
      2. 2.3.2 High Frequency Power Switch Selection
      3. 2.3.3 Input AC Voltage Sensing
      4. 2.3.4 Bulk Voltage Sensing
      5. 2.3.5 Input Current Sensing
      6. 2.3.6 Baby Boost Design
      7. 2.3.7 Relay
      8. 2.3.8 Protection
        1. 2.3.8.1 Over Voltage Protection
        2. 2.3.8.2 Over Current Protection
  7. 3Power Up
    1. 3.1 Required Equipment
    2. 3.2 Considerations
    3. 3.3 Start-Up Sequence
  8. 4Testing Results
    1. 4.1 Start-Up Waveform
    2. 4.2 THD Performance
    3. 4.3 Power Factor
    4. 4.4 Efficiency
      1. 4.4.1 Efficiency Graph
      2. 4.4.2 Efficiency Data
    5. 4.5 E-meter Performance
      1. 4.5.1 E-meter Graphs
      2. 4.5.2 E-meter Data
    6. 4.6 Load Transients
    7. 4.7 Input Current Waveforms
    8. 4.8 AC Drop Test
    9. 4.9 Thermal Images
  9. 5External Reference

5 External Reference

[1] B. Sun, S. Yu, B. Genereaux, L. Yin, "Design and Control Strategy of PFC During AC Dropout in a High Reliability and High-Power Density Server Power Supply", ECCE 2023

[2] B. Sun, S. Yu, T. Hud, "A Totem-pole PFC with Re-rush Current Control, Accurate E-metering, Low iTHD and High Power Density", APEC 2024

[3] Modular Hardware System – Common Redundant Power Supply (MCRPS) Base Specification. Open Compute Project, Version 1.02 RC2, Aug. 23, 2023. [Online].

[4] J. Kim, B. McDonald, S. Yu, “AC Dropout Algorithm for Digitally Controlled Totem-pole Bridgeless PFC”, APEC 2023

[5] B. Sun, “How to reduce THD of a PFC”, April 2023, EDN

[6] S. Yu, “Current sensing considerations in a bridgeless totem pole PFC”, June 2022, EDN

[7] R. Yin, “Five major trends in power supply design for servers”, August 2022, EDN

[8] B. Sun, “How to improve the power factor of a PFC”, January 2024, EDN