Operation Principle - Kemppi KEMPOMIG 3200 Service Manual

1 Synergic program selection
2 Crater fill on/off
3 Post current adjustment 40 ms...760 ms

Operation principle

Kempomig- power sources power stage is a traditional half-bridge, where the DC-link´s voltage is
halved by load capacitors C2 and C3. IGBT transistors work as power switches.
When both IGBTs are non-conductive, no power is transferred. When the upper IGBT (V2) is
conductive, there is positive voltage in the main transformer´s (T1) primary, and when the lower
IGBT (V3) is conductive there is negative voltage in the main transformer´s (T1) primary.
Power is adjusted by changing the IGBT timings (PWM). Main transformer T1 secondary
voltages are rectified with a full-waverectifier.
approx. + 570 V
U
C2
T1
C3
V2
1
U
G2
V3
U
G3
U
2
5 6 7
1
8
4
3 9
2 H
1 L
3
1
U
G2
U
G3
U
1
U
2
2
2 3
t
t
t
t
5