JP3292315B2 - Uninterruptible power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses power line carrier communication for information transmission between information devices such as personal computers, engineering workstations, large computers, and other security systems, and the information devices are safe, that is, a power failure occurs. The present invention relates to an uninterruptible power supply device capable of operating even with a power supply.

[0002]

2. Description of the Related Art Conventionally, communication between information devices of this type is usually performed using a wired or wireless dedicated line.
In addition, an uninterruptible power supply has been attached to the power supply so that data is not destroyed by a power failure. On the other hand, according to the power line carrier communication, there is no need for wiring,
An existing power line may be used, a communication system can be easily configured, and the power of the communication device can be obtained using the power of the power line. However, when performing communication between information devices, data may be destroyed as described above, and therefore, it is necessary to use an uninterruptible power supply. It has been difficult to perform power line communication between information devices.

FIG. 3 shows a conventional uninterruptible power supply.
The input terminal 11 is connected to a commercial power supply. The input terminal 11 is connected to a fixed contact a of a changeover switch 15 through a breaker 13 and further through a low-pass filter 14. The output side of the filter 14 is a power failure detection circuit 1
6 and the charging circuit 17. The charging circuit 17 charges the storage battery 18 and the DC output of the storage battery 18 is
In step 9, the output is converted to an AC output having substantially the same frequency as the commercial power supply frequency. The output side of the inverter 19 is connected to the fixed contact b side of the changeover switch. The movable contact of the changeover switch 15 is passed through the low-pass filter 21 and further connected to the breaker 2.
2 to the output terminal 23. A power supply device such as an information device is connected to the output terminal 23.

Normally, that is, when the commercial power is normal, the changeover switch 15 is connected to the low-pass filter 14 side, and the commercial power is supplied to the output terminal 23 through the switch 15 and further through the low-pass filter 21. Is done. When a power failure occurs, the power failure detection circuit 16 detects this and switches the switch 15 to the inverter 19 side, and the output of the inverter is output to the output terminal 2 through the low-pass filter 21.
3 is supplied. When the AC power returns to normal, the power failure detection circuit 16 detects this, and returns the changeover switch 15 to the low-pass filter 14 side. When the commercial power supply is normal, the storage battery 18 is charged through the charging circuit 17. The low-pass filters 14 and 21 are for blocking noise generated from the inverter 19 from leaking outside.

[0005]

A conventional power line carrier is used for communication between information devices such as a computer, and a conventional uninterruptible power supply device shown in FIG. 3 is used for the information devices. , Low-pass filters 14, 21
, The carrier for power line carrier communication is cut off and communication between information devices cannot be performed. Further, at the time of power failure, the switch 15 is switched to completely cut off the connection between the input terminal 11 and the output terminal 23, so that power line carrier communication cannot be performed. Another conventional uninterruptible power supply device shown in FIG.
9 is also supplied to the output terminal side, and since there is a low-pass filter for preventing noise from the inverter from going outside, power line carrier communication can be performed. Absent.

An object of the present invention is to provide an uninterruptible power supply which enables power line carrier communication.

[0007]

According to the present invention, a band-pass filter having a pass band of a frequency band used for power line carrier communication is provided between an input terminal and an output terminal.

[0008]

FIG. 1 shows an embodiment of the present invention, in which parts corresponding to those in FIG. 3 are denoted by the same reference numerals. In the present invention, a band-pass filter 31 is connected between the input terminal 11 and the output terminal 23. In this example, bandpass filter 3
Reference numeral 1 denotes a case where the input terminal 11 and the output terminal 23 are respectively connected through the breaker switches 12 and 22. Bandpass filter 31 is for the passband carrier frequency of the power line carrier communication, for example 10KH _Z to 4
That the pass band 50KH _Z is used, which is C
It can be configured as a passive circuit using R elements or as an active filter.

According to this configuration, the noise from the inverter 19 is blocked by the low-pass filters 14 and 21 and does not go outside, but the band-pass filter 31 is located between the outsides of the low-pass filters 14 and 21. Therefore, the power line carrier signal can pass between the input terminal 11 and the output terminal 23 regardless of which side the switch 15 is switched to. And power line carrier communication between the information devices.

For example, as shown in FIG.
The power line (distribution line) 34 is connected to the switchboard 33
The switchboard 33 is wired to the outside, for example, on a pole.
Commercial power is supplied from the lance. Inside this house 32
At the power line 34, for example, as shown in FIG.
Uninterruptible power supply 35 according to the invention₁To 35_ThreeIt
The computer 36₁To 36_ThreeIs connected
You. These computers 36₁To 36_ThreeIs the power line 34
Operating power from the commercial power supply through the
Uninterruptible power supply 35₁To 35_ThreeWorks
Computer 36 ₁To 36_ThreeEach work normally,
Data is not destroyed. Again
Computer 36₁To 36_ThreePower between
Data exchange by power line carrier communication via line 34
Can be performed.

[0011] In Figure 2B, the computer 36 ₄ is attached to the computer 36 ₂ and uninterruptible power supply device 35 ₂ common to FIG. 2A, also used in common for the uninterruptible power supply 35 ₃ Computer 36
_3, 36 _5, 36 ₆ is the case that is provided. In this case, direct data communication is performed between the computers 36 ₃ , 36 ₅ and 36 ₆ , and the computers 36 ₂ , 36 ₅ and 36 ₆
Data and wireless communication is performed similarly in between 36 _4.
However, the computers 36 ₁ , 36 ₂ , 36 ₄ and 36 ₃ ,
Mutual data communication between 365 ₅ and 36 ₆ is via power line 3.
4 through power line carrier communication.

The band-pass filter 31 for passing only the power line carrier communication frequency band may be provided inside the uninterruptible power supply, or may be externally provided outside the existing uninterruptible power supply.

[0013]

As described above, according to the present invention, the power line carrier communication frequency is provided between the input and output terminals, that is, on the input side of the input filter for blocking the noise of the inverter and on the outside of the output side of the output filter. Since the filter that passes the band is connected, mutual data communication between information devices such as computers can be performed using the uninterruptible power supply device of the present invention. Therefore, in the place where the power line is wired, data transmission between information devices can be easily performed by the power line carrier communication system,
Moreover, even in the case of a power failure, the information equipment can be operated normally.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a system for performing inter-computer communication to which the present invention is applied by power line carrier communication.

FIG. 3 is a block diagram showing a conventional uninterruptible power supply.

Claims (1)

(57) [Claims] A commercial power supply is connected to an input terminal and an output terminal is connected to a commercial power supply.
A device that performs power line carrier communication is connected, and the
Charging the storage battery through the first low-pass filter
Charging circuit, and an input for converting the power of the storage battery into AC.
And the output power of the first low-pass filter
The output power of the inverter is switched to the second low-pass filter.
An uninterruptible power supply having means for outputting to said output terminal via a filter, wherein a band-pass filter for passing a frequency band used for power line communication is connected between said input terminal and said output terminal. An uninterruptible power supply.