– 154 –
DC Voltage is detected by microcomputer and is then increased to value matching rotation speed. Basic configuration is
voltage-increasing chopper circuit:
Q1 is chopped by high frequency and current (I
1
) flowing during is charged in reactor, then discharged (I
2
) to
capacitor during OFF period.
Adjust Q1 chopper duty so that current charged in reactor matches current consumed by inverter. ( For hight
speed and high load, DC voltage increases as duty increases.)
12. Increasing DC Voltage (Vd)
IC
Analog voltage
Reactor
ACT module
Compressor
D-pass filter
Microcomputer
DC voltage
Command voltage
(PWM output)
Q1
P
M
I
1
I
2