JP2006230029A - Uninterruptible power supply unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply unit which is low in extension cost. <P>SOLUTION: To solve the above problem, this uninterruptible power supply unit capable of parallel connection with a plurality of uninterruptible power supply units is equipped with a battery which supplies power to an apparatus connected with itself at power failure, an inverter which converts the power of the above battery into the power of the apparatus connected with itself, a battery output terminal which supplies power to the inverter of another connected uninterruptible power supply unit from the battery of itself, and a battery input terminal which receives power from the battery of another uninterruptible power supply unit connected to itself. Or, this is equipped with a means which switches the line of power input of the above inverter into either the battery of itself or the battery of another uninterruptible power supply unit connected in parallel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for increasing battery capacity and a method for performing battery redundancy by connecting a plurality of uninterruptible power supplies.

  Many of the uninterruptible power supplies have a power consumption rating for the battery in advance. If the rated power is exceeded due to the increase in the number of connected devices, an uninterruptible power supply is additionally installed and connected. In addition, some expensive uninterruptible power supply apparatuses have a mechanism in which additional batteries can be added in advance in order to increase battery power. An example of such an uninterruptible power supply that can be operated in parallel is disclosed in Patent Document 1.

JP 2003-289633 A

  As described above, in many uninterruptible power supply units, the power consumption rating of the battery is determined. Therefore, 300 VA equipment is connected to the 500 VA uninterruptible power supply unit with 300 VA equipment added. In such a case, a 500VA uninterruptible power supply was additionally introduced and connected separately. When such a thing occurs at any time, for example, even in the above case, an uninterruptible power supply apparatus having a wasteful amount of power so that the total capacity of the connected device is 600 VA and the power of 400 VA is unused with respect to the total capacity of the battery 1000 VA. It will be introduced from time to time.

  In addition, some uninterruptible power supply apparatuses have a mechanism in which a battery can be additionally added in advance. However, since the inverter section has a capacity at the time of expansion, it is relatively expensive. Also, since the introduction of such an uninterruptible power supply, the specification of the additional equipment to be added in the future cannot be introduced unless it is clarified. It will lead to introduction.

  In order to solve the above problems, an uninterruptible power supply of the present invention that can be connected in parallel to a plurality of uninterruptible power supplies includes a battery that supplies power to equipment connected to the uninterruptible power supply in the event of a power failure, and the power of the battery To the power of the equipment connected to the uninterruptible power supply, a battery output terminal for supplying power to the inverter of the other uninterruptible power supply connected from the battery of the uninterruptible power supply, and the uninterruptible power supply It was set as the structure provided with the battery input terminal which receives power supply from the battery of the other uninterruptible power supply device connected to an apparatus.

  The uninterruptible power supply of the present invention includes a battery that supplies power to a device connected to the uninterruptible power supply during a power failure, and an inverter that converts the power of the battery into the power of the device connected to the uninterruptible power supply. The power input of the inverter is provided with means for switching either the battery of the device or the battery of another uninterruptible power supply connected in parallel.

  According to the present invention, the amount of power of the uninterruptible power supply can be used without waste, and it is possible to easily cope with unscheduled connection equipment expansion, so introduction by reducing the battery capacity of one uninterruptible power supply Costs can be reduced.

  In addition, by connecting multiple uninterruptible power supply units and connecting batteries in series, the total power of the connected uninterruptible device battery can be used without any waste. Can be dealt with by additionally introducing the uninterruptible power supply of the present invention.

  In addition, this uninterruptible power supply is low-priced, easy to install even at the initial installation, and simply connect the uninterruptible devices to each other at the time of future expansion of connected devices. There is no need to consider.

  Further, by switching the connection path between the uninterruptible power supply devices by the battery capacity detection circuit, the battery can be made redundant when the total capacity of the battery is sufficient.

  Embodiments of the present invention will be described below.

  Embodiments of an uninterruptible power supply according to the present invention will be described below with reference to the drawings. FIG. 1 to FIG. 4 are explanatory diagrams when three uninterruptible power supply apparatuses according to the embodiment of the present invention are connected, and the thick line portion in each figure indicates a power feeding path. FIG. 1 shows a case where there is no power outage, and FIG. 2 shows a case where a power outage occurs, but the battery capacity of each uninterruptible power supply is sufficient. FIG. 3 and FIG. 4 are drawings for explaining the operation situation when the battery capacity of any of the uninterruptible power supply devices operating in parallel is insufficient, and FIG. 3 is a battery of one uninterruptible power supply device. FIG. 4 shows the case where the batteries of the two uninterruptible power supply units become insufficient.

  Each uninterruptible power supply of this embodiment connects a battery output terminal 5 for connecting a battery output to another uninterruptible power supply that operates in parallel and a battery output of another uninterruptible power supply that operates in parallel. Battery input terminal 6 is provided. Via these terminals, it is possible to connect the batteries of other uninterruptible power supply units that operate in parallel.

  Further, SW1 and SW2 in the figure are switches as follows by the battery capacity detection circuit. Specifically, the SW 1 is connected so as to input the current supplied from the battery input terminal 6 to the inverter 2 when a decrease in the battery capacity is detected, and from the battery input terminal 6 in other cases. The supplied current is input to the battery of the uninterruptible power supply via the diode 4. SW2 is a switch for disconnecting current supply from the battery to the inverter 2 and the battery output terminal 5 when a decrease in battery capacity is detected.

  Next, the connection between the battery output terminal 5 and the battery input terminal 6 will be described with reference to FIG. The battery input terminal 6 of the uninterruptible power supply 1 is connected to the battery output terminal 5 of the uninterruptible power supply 2, and the battery input terminal 6 of the uninterruptible power supply 2 is connected to the battery output terminal 5 of the uninterruptible power supply 3. To do. Then, the battery input terminal 6 of the uninterruptible power supply 3 is connected to the battery output terminal 5 of the uninterruptible power supply 1. In the present embodiment, the parallel connection of three uninterruptible power supply devices will be described, but the battery output terminal 5 and the battery input terminal 6 may be connected so that the device goes around even in cases other than three.

  In the state where there is no power failure, as shown in FIG. 1, external power is connected to the connected device, and the output of the inverter 2 is not connected. In addition, a charging current is supplied to the battery via the converter 3. In addition, SW1 of each uninterruptible power supply connected in parallel is set to the side that connects the battery output terminal of the other uninterruptible power supply and the battery via a diode, and SW2 is the side that connects the battery to the inverter Set to

  FIG. 2 illustrates a configuration in the case where a power failure occurs and power supply from the outside is lost, and power is supplied to the connected device from the uninterruptible power supply according to the present embodiment. The settings of SW1 and SW2 are the same as described above. Each connected device is supplied with electric power from the battery via the inverter 2 and continues to operate. Furthermore, although the uninterruptible power supply devices are connected to each other, since they are connected via the diode 4, current does not flow until the voltage difference between the batteries becomes large.

  FIG. 3 shows that when a power failure occurs and power is not supplied from the outside and power is supplied from the uninterruptible power supply to the connected device, the battery of the uninterruptible power supply 1 is in a discharged state and power can be supplied to the connected device. The case where it is not lost is shown. At this time, SW2 is set by the battery capacity detection circuit 1 to the side where the connection between the battery and the inverter 2 is disconnected. Further, SW1 is set by the battery capacity detection circuit 1 to the side where the battery input terminal 6 and the inverter 2 are connected. SW1 and SW2 of uninterruptible power supplies 2 and 3 have sufficient battery capacity, so there is no change in settings.

  Thus, when the battery of the uninterruptible power supply 1 is discharged, the setting state of SW1 and SW2 changes, and the inverter 2 of the uninterruptible power supply 1 is connected to the inverter 2 of the uninterruptible power supply 2 via the battery output terminal 5. Power is supplied from the battery of the uninterruptible power supply 2. Therefore, electric power is continuously supplied to the connected device connected to the uninterruptible power supply 1.

  Similarly, when the battery of the uninterruptible power supply 2 is in a discharged state, power is supplied from the battery of the uninterruptible power supply 3 to the inverter of the uninterruptible power supply 2, and the battery of the uninterruptible power supply 3 is in a discharged state. Is supplied from the battery of the uninterruptible power supply 1 to the inverter of the uninterruptible power supply 3.

FIG. 4 illustrates power supply when two batteries of three uninterruptible power supply devices connected in parallel are in a discharged state. The batteries of uninterruptible power supply devices 1 and 3 are in a discharged state, and the inverter The power cannot be supplied. At this time, SW1 and SW2 are the same as in FIG.
Controlled by the battery capacity detection circuit 1. The SW connection is changed, and the inverter 2 of the uninterruptible power supply 1 is supplied with power from the battery of the uninterruptible power supply 2 via the battery output terminal 5 of the uninterruptible power supply 2. The inverter 2 of the uninterruptible power supply 3 is supplied with power from the battery of the uninterruptible power supply 2 via the battery output terminal 5 of the uninterruptible power supply 1 and the battery input terminal 6 of the uninterruptible power supply 3. . In this way, power is continuously supplied to the connected devices connected to the uninterruptible power supply devices 1 and 3 that have run out of battery capacity.

  In particular, in the present embodiment, when each uninterruptible power supply has a 500 VA power capacity and the connected device is a 300 VA system, one of the three uninterruptible power supplies described in FIG. Even if the batteries of one uninterruptible power supply are discharged, the power supply to the connected devices can be continued by the batteries of the other uninterruptible power supply devices. Therefore, the redundant operation of the uninterruptible power supply can be performed.

It is a schematic block diagram at the time of the power failure non-occurrence | production at the time of carrying out the parallel connection structure of the uninterruptible power supply of an Example. It is a schematic block diagram when an uninterruptible power supply unit is operating in parallel at the time of a power failure. It is a figure which shows the parallel operation when the battery of the uninterruptible power supply 1 has reached the end of its life. It is a figure which shows the parallel operation when the battery of the uninterruptible power supply 1 and 3 has reached the end of its life.

Explanation of symbols

1: battery capacity detection circuit, 2: inverter, 3: converter,
5: Battery output terminal, 6: Battery input terminal

Claims (2)

In uninterruptible power supply units that can be connected in parallel with multiple uninterruptible power supply units,
A battery that supplies power to equipment connected to the uninterruptible power supply in the event of a power failure;
An inverter that converts the power of the battery into the power of a device connected to the uninterruptible power supply, and
A battery output terminal for supplying power to an inverter of another uninterruptible power supply connected from the battery of the uninterruptible power supply,
An uninterruptible power supply comprising a battery input terminal that receives power from a battery of another uninterruptible power supply connected to the uninterruptible power supply. In uninterruptible power supply units that can be connected in parallel with multiple uninterruptible power supply units,
A battery that supplies power to equipment connected to the uninterruptible power supply in the event of a power failure;
An inverter that converts the power of the battery into the power of a device connected to the uninterruptible power supply, and
An uninterruptible power supply comprising: a means for switching a power input of the inverter between a battery of the apparatus and a battery of another uninterruptible power supply connected in parallel.

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