To provide an uninterruptive power unit which supplies inexpensive and high-quality AC output, by suppressing the ripple and noise caused by excess and shortage of the voltage of supply voltage to a load apparatus at receiving of commercial power, in a relatively inexpensive normal commercial power supply system of uninterruptible power unit.
The normal commercial power supply system of uninterruptible power unit is equipped with a detection means for detecting at least either ripples or noise due do excess or shortage of voltage of commercial power or preferably both of them, and has a power generation means which generates power of voltage reverse of the voltage ripples or the noise, based on the information from this detection means. This uninterruptible power unit negates the voltage ripples or the noise of commercial power by feeding back this power at reverse voltage to the commercial power source.
SATO TATSUHIKO
Tomoyasu Sakaguchi
Hiroki Naito
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