Pfc Card Functions And Connectors - Kemppi MLS 2300 ACDC Service Manual

PFC card Z004
Functions and connectors:
The PFC -card Z004 includes these operational blocks:
- EMI -filter
- Net connecting transient damping
- Primary rectifier
- PFC -power stage
- PFC -power stage control
- Net overvoltage watch
- Auxiliary voltages developing
- EMI -filter reduces the electromagnetic disturbances conducting to the net (EN50199).
- The net connecting transient is damped by the PTC-resistor R23 and relay K1 together. The rectifier
unit V1 rectifies the net voltage to DC, which can fluctuate between + 260...380 V. Power
supply to the power supply card A002 via connectors X13 and X14.
- PFC's power stage (boost converter) increases the full-wave rectified net voltage up to +400 V DC and
forces the net current into sinus form.
- Note. IGBT -transistors V4...V7 are insulated from the heat sink! Diodes V2 and V3 are not insulated, so
diode cathodes and heat sink share the same potential approx. + 400 V!
X1
X14
X13
X10
X9
X12
X11
X2
X3
X5 X7
X8
X15
X6
16