Kemppi miniarc 110, Руководство по устранению неисправностей

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Operating principal
VDC
t
105
13µs
Ma
x.
0,5
n. + 320 V
1/3
V1
V2
When IGBT-transistors V1 and V2 are not conductive, no power is transferred. The power is
adjusted by changing the IGBT-transistors conductive timings (PWM).
Main circuit
+ t + t
X3
X1
X2
R6
9
R7
0
L2
C2
8
C2
2
C5
L1
R59 R54
C4
3
V26
V
23
V9
C1
, C2
, C3
V5,
V3
2
V1,
V
31
V2,
V
3,
V4
V6
, V
7,
V8
T00
1
T2
K1
T0
01
U
R64
U
V29, V30
C39
R65
R6
6
C3
8
V2
7,
V2
8
R6
3
X18
X17
L001
L002
X003
X004
X16
X3
X2
Z001
Minarc power sources are ”dual-Forward”-inverter power sources, controlled by PWM method.
The switching components are IGBT-transistors. Inverter operating frequency is approx. 80 kHz.
Below is a picture of the ”dual-forward”-inverter operating principal:
4