Uninterruptible power supply apparatus

• US 20050094339A1
• Filed: 09/30/2004
• Published: 05/05/2005
• Est. Priority Date: 10/30/2003
• Status: Active Grant

• Current Assignee: Sanyo Denki Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Denki Company Limited (Panasonic Holdings Corporation)
• Inventors: Okui, Yoshiaki, Nakamura, Naoya, Oota, Shouichi
• Granted Patent: US 7,166,931 B2
• Time in Patent Office: Days
• US Class Current: 361/90
• CPC Class Codes: H02J 9/062 for AC powered loads

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.

Claims

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.

4. The uninterruptible power supply apparatus according to claim 1, further comprising:

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 determined in accordance with 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.

5. The uninterruptible power supply apparatus according to claim 1, further comprising:

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 determined in accordance with 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.

2. 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 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.

3. 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 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.