Hitachi RAM-90QH5, Service Manual, Page: 66 / 83

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10. Power Factor Control Circuit
Power factor is controlled by 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)
V (input voltage)
input voltage
input current
Effective
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.