AirStage AO54FJ, Service Manual

Page: 43 / 169

03-04
3-2-5 Choke Coil
3-2-6 Active Filter Module
3-2-7 Smoothing Condensor
3-2-8 IPM (Integrated Power Module)
The input current is corrected by the microcomputer inside the module and the boosting
chopper circuit, and the waveform with 100% of power factor is supplied to the output.
It improves the power factor, and controls the power supply harmonic wave current.
The target DC voltage is set up by the input voltage and multiplied in comparison
with the input DC voltage.
The multiplied target current and the input current are compared.
The compared value is compacted at with the waveform the oscillator at PWM comparator.
The compared signal controls the switching component ON and OFF.
When compressor is stopped = Input Voltage x Root 2 (Effective Value)
When compressor is operated = 380V
This is used to remove the ripple of DC voltage that is output from the
active filter.
It is composed of 6 transistors and drives the motor by high speed switching.
The drive voltage signal is transferred to the drive circuit from microcomputer,
and varies the supply frequency to the motor (PWM system) to rotate the motor.
It conditions the current waveform and removes the noise.