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12PHR-N
2. Explanation of Plasmacluster 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) in the air to air heat pump unit.
1)When microcomputer output turns "H", the Q11 output changes to "Lo", turning ON the cluster unit for the generation of cluster ions
(positive and negative ions).
5
1
12V
SSR1
R16
R18
IC13
AC230V
Microcomputer output
4
1
Cluster unit
R19
R17
6
2
4
1
C5
3. Outline of PAM circuit
3.1. 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.
PAM drive circuit block diagram
Reactor L5
[PAM drive circuit]
+
Microcomputer (IC1)
AC
230V
Compressor
Noise
filter
AC clock
detection
circuit
DB1
IPM
DB2
Compressor
position
detector
IGBT
drive
circuit
IGBT
Overvoltage
detection
circuit
When the IGBT is ON, an electric current flows to the IGBT via the reactor (L1) and diode bridge (DB2).
When the IGBT turns OFF, the energy stored while the IGBT was ON is charged to the voltage capacitor via the diode bridge (DB1).
As such, by varying the ON/OFF duty of the IGBT, the output voltage is varied.
Stored energy
Reactor
L5
DB1
DB2
IGBT
IGBT ON
IGBT OFF
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