– 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 (I2) 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
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