Uninterruptible power supply apparatus
First Claim
1. An uninterruptible power supply apparatus comprising:
- an AC switch which turns on/off the AC power that is input from a commercial power source;
a storage battery;
a power conversion device installed between said AC switch and said storage battery;
a load device connected to the output end of said AC switch;
an output AC voltage detection unit which detects an output AC voltage that is output from said AC switch; and
an abnormality detection circuit which detects that the output AC voltage detected by said output AC voltage detection unit is outside predefined upper and lower limits;
wherein said AC switch turns off in accordance with a signal detected by said abnormality detection circuit.
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Accused Products
Abstract
The uninterruptible power supply apparatus comprises an AC switch for turning on/off the AC power that is input from a commercial AC power source; a storage battery; a power conversion device; a load device connected to the output end of the AC switch; an output AC voltage detection unit for detecting an output AC voltage that is output from the AC switch; and an abnormality detection circuit for detecting that the detected output AC voltage is outside predefined upper and lower limits; wherein said AC switch turns off in accordance with a signal detected by said abnormality detection circuit. Further comprises a restoration circuit for generating a restoration signal when the AC voltage detected by an input AC voltage detection unit exceeds at least a lower-limit AC voltage setting that is increased gradually or continuously in accordance with a load factor computed by a load factor computation circuit.
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Citations
5 Claims
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1. An uninterruptible power supply apparatus comprising:
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an AC switch which turns on/off the AC power that is input from a commercial power source;
a storage battery;
a power conversion device installed between said AC switch and said storage battery;
a load device connected to the output end of said AC switch;
an output AC voltage detection unit which detects an output AC voltage that is output from said AC switch; and
an abnormality detection circuit which detects that the output AC voltage detected by said output AC voltage detection unit is outside predefined upper and lower limits;
wherein said AC switch turns off in accordance with a signal detected by said abnormality detection circuit. - View Dependent Claims (4, 5)
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2. An uninterruptible power supply apparatus comprising:
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an AC switch which turns on/off the AC power that is input from a commercial power source;
a storage battery;
a power conversion device installed between said AC switch and said storage battery;
a load device connected to the output end of said AC switch;
an input AC voltage detection unit which detects an input AC voltage that is input to said AC switch;
a load current measurement unit which measures the load current of said load device;
a load factor computation circuit which computes a load factor in accordance with the load current measured by said load current measurement unit; and
a restoration circuit which generates a restoration signal when the AC voltage detected by said input AC voltage detection unit exceeds at least a lower-limit AC voltage setting that is increased gradually or continuously in accordance with an increase in the load factor computed by said load factor computation circuit;
wherein said AC switch turns on to achieve restoration in accordance with the restoration signal generated by said restoration circuit.
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3. An uninterruptible power supply apparatus comprising:
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an AC switch which turns on/off the AC power that is input from a commercial power source;
a storage battery;
a power conversion device installed between said AC switch and said storage battery;
a load device connected to the output end of said AC switch;
an input AC voltage detection unit which detects an input AC voltage that is input to said AC switch;
a load current measurement unit which measures the load current of said load device;
a load factor computation circuit which computes a load factor in accordance with the load current measured by said load current measurement unit; and
a restoration circuit which generates a restoration signal when the AC voltage detected by said input AC voltage detection unit is between upper- and lower-limit AC voltage settings that are increased gradually or continuously in accordance with an increase in the load factor computed by said load factor computation circuit;
wherein said AC switch turns on to achieve restoration in accordance with the restoration signal generated by said restoration circuit.
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Specification