1) Stage 1 [t0, t1]: At t0, the gate-emitter voltage vge
reaches the threshold voltage Vth, where the forward current
of the diode id is equal to IL and begins to decline with an
approximately fixed slope. In this period, although the diode
carrier concentration decays rapidly, diode DM retains a
forward voltage drop. The collector-emitter voltage vce of SM
falls to a platform voltage Δvl during this stage.
2
( ) () ( ) c
ce dc s eE
di t vt V L L
dt
=− + (1)
where ic(t) is the collector current though SM. The current
slope dic/dt is determined by the bus voltage Vdc, the loop
parasitic inductances, and the switching speed of switch SM.
1) Stage 1 [t0, t1]: At t0, the gate-emitter voltage vgereaches the threshold voltage Vth, where the forward currentof the diode id is equal to IL and begins to decline with anapproximately fixed slope. In this period, although the diodecarrier concentration decays rapidly, diode DM retains aforward voltage drop. The collector-emitter voltage vce of SMfalls to a platform voltage Δvl during this stage.2( ) () ( ) cce dc s eEdi t vt V L Ldt=− + (1)where ic(t) is the collector current though SM. The currentslope dic/dt is determined by the bus voltage Vdc, the loopparasitic inductances, and the switching speed of switch SM.
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