3.5 Phase-Shifted Full-Bridge, Phase-Shifted Leg

Figure 3-7. Fully Soft Switching (ZVS) PSFB Leg. V_IN = 800V, V_OUT = 12V, I_OUT = 50A, Po = 600W

PSFB Leg-2 switches completely in ZVS (soft-switching). Figure 3-7 shows the switch node voltage of PSFB Leg-2. The switch node voltage swings completely to V_IN even before the high side switch is turned ON. This results in very low switching losses in the phase-shifted leg of PSFB.