Sharp AE-Z40KR Service Manual page 16

AYZP40KR
1.31. Program Eco Operation
1.31.1 Cool/Dry Operation
By pressing Program Eco button during Cool/Dry operation, the set
temperature will vary with 1/f fluctuation. 1/f fluctuation resembles fluc-
tuation existing in nature, and is said that it gives relaxation.(1/f Fuzzy
Logic) By varying the set temperature in +1 degree C ~ -0.33 degree C
range following 1/f fluctuation, the rise in set temperature will corre-
spond to +0.5 degree C in calculation. Since this air conditioner model
is inverter type, compressor output will also vary in the same manner.
As a result this will help saving electricity cost.
2. 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 Q11 output changes to "Lo," turning ON the SSR2 and applying 100 V to the cluster unit for the gener-
ation of cluster ions (positive and negative ions).
AC230V
Microcomputer output
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.
Noise
AC
filter
230V
When the IGBT is ON, an electric current flows to the IGBT via the reactor (L5,L6) and diode bridge (DB2).
When the IGBT turns OFF, the energy stored while the IGBT was ON is charged to the voltage doubler capacitor via the diode bridge (DB1).
As such, by varying the ON/OFF duty of the IGBT, the output voltage is varied.
Q11
R39
Reactor L5
Reactor L6
AC clock
detection
circuit
[PAM drive circuit]
Microcomputer (IC1)
PAM drive circuit block diagram
1.31.2 Heat Operation
By pressing Program Eco button during Heat operation, set tempera-
ture will vary in -2 degree C ~ +1 degree C range, and will correspond
to lowering the set temperature -1 degree C in calculation.
— MEMO—
When used in combination with Full Power control, priority is given to
the latter pushed button's control.
When used in combination with Vacancy mode, Vacancy mode has
priority.
12V R34
SSR2
DB1
+
DB2
IGBT
drive
circuit
IGBT
2 – 11
Cluster unit
JPC1
1 1
JPC2
3 4
IPM
Compressor
Overvoltage
Compressor
detection
position
circuit
detector