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SYS POWER SUPPLY UM E
U in
I 1
tr
D1
U out
+
C1
U 1
U ctrl
Tr
S1
U 2
C2
5598D412
-
Figure 2-12
Flyback converter with switch S1 closed
The rectified line voltage U in is applied to the input of the flyback converter. Capacitance
C1 is used as temporary storage because the energy is stored there during the off-state
phase. When power switch S1 is closed, the primary voltage of the transformer U 1 is equal
to the input voltage U in . A constantly rising current I 1 is flowing through the primary winding
of transformer Tr. During this time the transformer Tr consumes magnetic energy and
stores it in the air gap.
Because of the differential winding sense voltages U 1 and U 2 on the primary and
secondary winding are opposite to each other. There is no current flow through the
secondary winding because diode D1 is in the off state. No energy is transferred into the
output circuit.
U in
tr
I 2
D1
U out
+
C1
U 1
Tr
U 2
C2
-
Sp
U ctrl
S1
U
5598D413
Figure 2-13
Flyback converter with switch S1 opened
2-16
PHOENIX CONTACT
5598_en_03
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