Hitachi RAS-50YH4 Service Manual page 82

12. Power Factor Control Circuit
Power factor is controlled to almost 100%. (Effective use of power)
With IC in ACT module, control is performed so that input current waveform will be similar to waveform of input
voltage
I (input current)
input voltage
V (input voltage)
Effective
input current
voltage
area
Effective
voltage area
Invalid power area
(Even if voltage is applied. current does not flow)
* Assuming the same current capacity (20A), power can be used about 10% effective, comparing with curent use
(power factor of 90%), and maximum capacity is thereby improved.
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