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Figure: QR-mode time intervals
In the Quasi-Resonant mode each period can be divided into four different time
intervals, in chronological order:
Interval 1: t0 < t < t1 primary stroke. At the beginning of the first interval, the
MOSFET is switched 'on' and energy is stored in the primary inductance
(magnetization). At the end, the MOSFET is switched 'off' and the second interval
starts.
Interval 2: t1 < t < t2 commutation time. In the second interval, the drain voltage
will rise from almost zero to V
+n•(V
+V
). V
IN
OUT
F
is the forward voltage drop of
F
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