IVT GS-XP12HR-N Service Manual page 16

GSXP12HRN
3. Explanation of cluster circuit
The cluster unit generates cluster ions, which are circulated throughout the room by the air flow created by the blower fan (indoor unit fan motor) in
the air conditioner unit.
1) When microcomputer output turns "H," the IC6 output changes to "Lo," turning ON the SSR and applying 230 V to the cluster unit for the genera-
tion of cluster ions (positive and negative ions).
AC230V
Microcomputer output
4. Outline of PAM circuit
4.1. PAM (Pulse Amplitude Modulation)
The PAM circuit varies the compressor drive voltage and controls the rotation speed of the compressor.
The IGBT shown in the block diagram charges the energy (electromotive force) generated by the reactor to the electrolytic capacitor for the inverter
by turning ON and OFF.
Noise
AC
filter
230V
R75
R23
IC6
R20
Reactor L5
Reactor L6
AC clock
detection
circuit
[PAM drive circuit]
Microcomputer (IC1)
PAM drive circuit block diagram
12V
R76
C23
SSR
RE RH
DB1
+
DB2
IGBT
drive
circuit
IGBT
2 – 10
Cluster unit
1 1
3 3
5
6
IPM
Compressor
Overvoltage
Compressor
detection
position
circuit
detector