> Control technology > Emergency power supply system
HV(hybrid-vehicle) motor & electrical auxiliary equipment
Inverter for generator(CVCF)
Inverter for electric motor(VVVF)
Electronic control unit for Vehicle
Sensorless control of rotating machine
Emergency power supply system
No power cut
As the supply power source of UPS is only batteries, the power supplying time is short (several minutes). To lengthen it, many batteries must be used.
So, the maintenance work of many batteries is required.
Long power feeding period after power cut
There is a non-power period (because a certain length of time is required to start the engine generator).
It is possible to restart the power supply within a half
wavelength of the 50/60 Hz frequency after a power
(which causes nomal function to computer).
Long power feeding time during power cut period
(capable to cope with a long blackout period)
Users are unable to notice the occurrence of a blackout.
Detection of a blackout by computer
With the use of an inverter for generator, the AC current to be supplied during a blackout period will be a sine wave with a distortion of less than 1%.
The use of DC-DC converter enables to reduce the number of batteries.
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