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Digital Power Conversion Enables Wideband & Advanced Topologies

In advance of our chat session on Wednesday, Nov. 19, at 1:00 p.m. ET (10:00 a.m. PT), here is our third and last tutorial tech basic blog in order to stimulate your questions for our chat session.

1. GaN-Based HF CCM Totem-Pole Bridgeless PFC

(Image: TI)

(Image: TI)

Advantages

  • Low component count
  • Fixed switching frequency; zero reverse recovery switch should be used
  • GaN is a good candidate for the application
  • Possible to operate TM and ZVS at light loads

Control

(Image: TI)

(Image: TI)

  • Differential Vac sensing by ADCs
  • Firmware voltage loop and power management
  • Hardware current loop
  • Control both low-frequency switches and high-frequency switches
  • Dynamic zero or negative current detection for IDE or ZVS control
  • Dynamic dead time control

2. HF LLC Converter

(Image: TI)

(Image: TI)

  • High-performance resonant converter with relatively few components
  • Ground-referenced output stage
  • Single half-bridge on primary side
  • Resonant inductor can (partially) be made from transformer leakage

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