ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics 1 Lecture 23 Steady state solution of state plane Two possible trajectories for given M and J

ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics 9 Lecture 23 Two possible trajectories for given M and J

ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics 10 Lecture 23 Two possible trajectories for given M and J

ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics 11 Lecture 23 Steady state solution of state plane Solve for initial conditions M c0 and J L0

ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics 12 Lecture 23 CCM output plane characteristics

ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics 13 Lecture 23 Why all diodes become forward-biased Capacitor current waveform explanation CCM near DCVM boundary

ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics 14 Lecture 23 State plane trajectory: DCVM As predicted by CCM analysis DCVM trajectory DCVM occurs when

ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics 15 Lecture 23 Discontinuous conduction mode (DCVM) Occurs at heavy load and low output voltage During the “discontinuous” interval, all four output diodes are forward-biased The capacitor voltage waveform exhibits an additional subinterval with v c = 0

ECEN 5817 Resonant and Soft-Switching Techniques in Power Electronics 16 Lecture 23 DCVM solution Mode boundary Steady-state solution Output characteristics Solid lines: CCM Dashed lines: DCVM