Uninterruptible power supply apparatus

• US 20060125448A1
• Filed: 01/11/2005
• Published: 06/15/2006
• Est. Priority Date: 12/10/2004
• Status: Active Grant

• Current Assignee: Sanyo Denki Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Denki Company Limited (Panasonic Holdings Corporation)
• Inventors: Okui, Yoshiaki
• Granted Patent: US 7,579,714 B2
• Time in Patent Office: Days
• US Class Current: 320/138
• CPC Class Codes: H02J 9/062 for AC powered loads

Abstract

An uninterruptible power supply apparatus, enabling to detect an interruption on a commercial power supply, with certainty, to be turned into a battery operation, but not due to a momentary voltage-drop, unnecessarily, comprises: a rectifier (REC) 210 for converting an AD power inputted from a commercial power supply 100 into a DC power; an inverter (INV) 220 for converting the DC electric power into a desired AC power, to be supplied to a load 300; a battery 230 connected between those; a controller circuit 250 for controlling those power converters; and further, an interruption detection circuit 260 made from a frequency detection circuit, as a means for detecting an abnormality on the AC power inputted from the commercial power supply, whereby detecting the interruption, without responding to the momentary voltage-drop, while the controller circuit has a limiter 253 for protecting the rectifier from overload when the momentary voltage-drop occurs.

Claims

1. An uninterruptible power supply apparatus, comprising:

a first power converter for converting an AD electric power inputted from a commercial power source into a DC electric power;

a second power converter for converting said DC electric power into a desired AC electric power, to be supplied to a load;

a storage means connected between said first power converter and said second power converter;

a means for detecting an abnormality on said AC electric power inputted from said commercial power source; and

a controller portion for controlling said first power converter and said second power converter, wherein said abnormality detecting means inputs a frequency of the AC electric power inputted from said commercial power source, whereby detecting an interruption upon basis of lowering of the frequency of said AC electric power.

2. The uninterruptible power supply apparatus, as described in the claim 1, wherein said controller portion comprises a means for limiting an increase of current within said first power converter accompanying with lowering of voltage of the AC electric power inputted from said commercial power source.

3. The uninterruptible power supply apparatus, as described in the claim 2, wherein said first power converter is made up with a rectifier, said controller portion comprises a PWM circuit for controlling said rectifier, and further said limiting means limits a value of an instruction signal inputted into said PWM circuit.

4. The uninterruptible power-supply apparatus, as described in the claim 1, wherein said abnormality detecting means detects the interruption when the AC electric power inputted from said commercial power source down to about 80-90% in the frequency thereof.

5. The uninterruptible power supply apparatus, as described in the claim 1, wherein said storage means comprises a battery.

6. The uninterruptible power supply apparatus, as described in the claim 1, wherein said storage means comprises a capacitor.

7. An uninterruptible power supply apparatus, comprising:

a first power converter for converting an AD electric power inputted from a commercial power source into a DC electric power,

a second power converter for converting said DC electric power into a desired AC electric powers to be supplied to a load;

a storage means connected between said first power converter and said second power converter;

a means for detecting an abnormality on said AC electric power inputted from said commercial power source; and

a controller portion for controlling said first power converter and said second power converter, wherein said controller portion further comprises a means for limiting an increase of current within said first power converter accompanying with lowering of voltage of the AC electric power inputted from said commercial power source.

8. The uninterruptible power supply apparatus, as described in the claim 7, wherein said current limiting means of said controller portion limits the current within a range of capacity of a rectifier, which builds up said first power converter for converting the AC electric power inputted from said commercial power source into the DC electric power.

9. The uninterruptible power supply apparatus, as described in the claim 8, wherein said first power converter is made up with a rectifier, said controller portion comprises a PWM circuit for controlling said rectifier, and further said limiting means limits a value of an instruction signal inputted into said PWM circuit.

10. The uninterruptible power supply apparatus, as described in the claim 7, wherein said abnormality detecting means detects the interruption when the AC electric power inputted from said commercial power source down to about 80-90% in the frequency thereof.

11. The uninterruptible power supply apparatus, as described in the claim 7, wherein said storage means comprises a battery.

12. The uninterruptible power supply apparatus, as described in the claim 7, wherein said storage means comprises a capacitor.

14. The uninterruptible power supply apparatus, as described in the claim 11, wherein said abnormality detecting means is made up with a frequency detection circuit.

15. The uninterruptible power supply apparatus, as described in the claim 11, wherein said abnormality detecting means is made up with a potential transformer.

16. The uninterruptible power supply apparatus, as described in the claim 11, wherein said abnormality detecting means detects the interruption when the AC electric power inputted from said commercial power source down to about 80-90% in the frequency thereof.

17. The uninterruptible power supply apparatus, as described in the claim 16, wherein said abnormality detecting means detects the interruption through comparing the AC electric power inputted from said commercial power source to a predetermined value memorized.

13. An uninterruptible power supply apparatus, comprising:

a first power converter for converting an AD electric power inputted from a commercial power source into a DC electric power;

a second power converter for converting said DC electric power into a desired AC electric power, to be supplied to a load;

a storage means connected between said first power converter and said second power converter;

a means for detecting an abnormality on said AC electric power inputted from said commercial power source; and

a controller portion for controlling said first power converter and said second power converter, wherein said abnormality detecting means detects an interruption, without responding to a momentary voltage-drop on the AC electric power inputted from said commercial power source.

18. The uninterruptible power supply apparatus, as described in the claim 13, wherein said storage means comprises a battery.

19. The uninterruptible power supply apparatus, as described in the claim 13, wherein said storage means comprises a capacitor.