Operation Principle - Kemppi KM 300 Service Manual

Main circuit card Z001

Operation principle

Approx.. + 570 V
G1
U
G1
G3
U
G3
U
G1
U
G2
U
G3
U
G4
U
T1
U
G5
U
L1
When IGBT-transistors G1 and G4 conduct, there is a positive voltage U
and when IGBT-transistors G2 and G3 conduct there is a negative voltage U
Power is adjusted by changing the IGBT timings (PWM)
G2
U
G2
U
T1
G4
U
G4
G5
L1
U U
G5 L1
t
t
t
t
t
t
t
in main transformer T1 primary
T1
in main transformer primary.
T1
15