JP2001157380A - Expansion battery box with communicating function provided on ups - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve an expansion battery box capable of setting arbitrary back-up times and allowing old and new batteries to be used together. SOLUTION: A voltage sensor 9, two-way switch circuits 10, 11, a capacitor 6, a control circuit 7 and a communication circuit 8 are provided on a power supply 1 comprising a charging circuit 4, an inverter circuit 5 and batteries 12. Also, batteries 22, 32, voltage sensors 19, 29, two-way switch circuits 20, 21, 30, 31, control circuits 18, 28, communication circuits 17, 27 are provided on the expansion battery boxes having a communication function. Each of the batteries 12, 22, 32 is connected parallel. Furthermore, communication-system information is transmitted between the communication circuit 8 of the power supply 1 and those 18, 28 of the expansion battery boxes 2, 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an additional battery box provided with an uninterruptible power supply (hereinafter referred to as UPS).

[0002]

2. Description of the Related Art A circuit configuration of a UPS having a conventional additional battery box is as shown in a block diagram of FIG. 2, a power supply (UPS) 101 includes a charging circuit 104, an inverter circuit 105, and a battery 11.
0, and a direct-current circuit between the battery 110 and the inverter circuit 105 has a parallel capacitor 10.
6, a voltage sensor 109, a switch circuit 107 for controlling ON / OFF of a DC circuit, and a drive circuit 108 thereof are provided.

[0005] Batteries 111 and 112 are stored in the additional battery boxes 102 and 103, and the batteries 111 and 112 are connected in parallel to the battery 110 of the power supply 101. Battery 110, 11
Since 1,112 are always connected in parallel, the discharging or charging by the battery must be executed simultaneously. When the battery voltage Vb drops to the discharge end voltage during discharging, the voltage detected by the voltage sensor 109 is input to the drive circuit 108, and the switch circuit 107 is turned off to turn off the batteries 110, 111, 112.
At the same time.

[0004]

As described above, in the conventional additional battery box, since all batteries are connected in parallel, the following problems occur. Battery capacity and charge / discharge characteristics must be the same. Battery voltage must be the same. Cannot mix new and old batteries. The backup time is determined by the number of additional battery boxes. The number of additional battery boxes arranged in parallel is small, and according to the embodiment, only about three parallel batteries can be added.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks of the conventional additional battery box. Each of the additional battery boxes has a bidirectional switch circuit, a voltage sensor, and a control unit. In addition to providing a circuit and a communication circuit, the power supply unit is also provided with a bidirectional switch, a voltage sensor, a control circuit and a communication circuit for collectively controlling all the batteries, and realizing mutual communication between the power supply unit and the additional battery box. A communication system that enables charging and discharging of each battery box.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an additional battery box with a communication function installed in a UPS according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the present invention. In FIG.
A power supply (hereinafter referred to as UPS) 1 includes a battery 12
A charging circuit 4 that charges DC power, an inverter circuit 5 that converts DC power into AC power and supplies the AC power to a load,
A battery 12 connected in parallel to a DC circuit between the inverter and the inverter circuit 5, a voltage sensor 9 for detecting a DC voltage,
Capacitor 6 connected in parallel to the input side of inverter circuit 5
And two switch circuits 10 and 1 provided between the negative pole of the battery 12 and the negative side of the inverter circuit 5.
1 bidirectional switch circuit. At the time of battery discharge, the switch circuit 11 (S1-B) of the bidirectional switch circuit is turned on and the switch circuit 10 (S1-A) is kept off, and at the time of battery charge, the switch circuit 10 (S1-A) is turned off. In step S1-A), the charge / discharge of the battery is switched by turning on the switch circuit 11 (S1-B).

The additional battery boxes 2 and 3 with a communication function include batteries 22 and 32 and voltage sensors 19 and 2.
9, control circuits 18 and 28, communication circuits 17 and 27 and 2
Switch circuit 20 constituting a set of bidirectional switch circuits
(S2-A) and 21 (S2-B), and switch circuits 30 (S3-A) and 31 (S3-B) are provided. n
Two additional battery boxes can be connected in parallel,
In this embodiment, a simplified example is shown in which two units are installed.

The control circuit 7 provided in the UPS 1 inputs a detection signal of the voltage sensor 9 and sends a drive signal to the drive circuit 13 or 14 of the bidirectional switch circuit to turn on the two switch circuits 10 or 11. OFF control function and battery 2 stored in additional battery boxes 2 and 3
It has a function of inputting information such as voltage values of 2 and 32 via the communication circuit 8, starting / stopping charging / discharging of the battery, and setting the priority (scheduling) of the battery. The control circuits 18 and 28 of the additional battery boxes 2 and 3 have a function of identifying the address or signal of the battery box.

The communication circuit 8 provided in the UPS 1 has communication circuits 17 and 27 in the additional battery boxes 2 and 3.
And the control circuit 7 transmits the battery voltage value of the additional battery box to the control circuit 7 via the communication circuits 17 and 27 and the communication circuit 8 of the UPS 1, respectively.
It allows selection of a charge / discharge battery.

Next, the charge / discharge characteristics of a UPS having an additional battery box will be described with reference to a flowchart shown in FIG. First, when starting the device, the priority of the charge / discharge battery is checked (step S1).
Normally, batteries give priority to discharging, so UPS
A control signal (discharge) is sent from the first control circuit 7 to the additional battery box, and a signal (Sn-B) for selecting a dischargeable battery is output (step S2).

Subsequently, it is determined whether or not the input AC power supply has stopped (step S3). (Step S3) is Y
At the time of ES, since the power has stopped, the (Sn-A) signals of all the bidirectional switch circuits are stopped (step S).
6). The battery voltage during discharge is detected to determine whether or not the discharge end voltage has been reached (step S7). If NO, the battery has not reached the discharge end voltage (step S2).
Return to and select a rechargeable battery. If (Step S7) is YES, it is determined whether or not there is a battery that can be discharged (Step S8). If YES (Step S3), the process returns to (Step S3). Sn-B) is stopped (step S9),
The device stops. When (Step S3) is NO, since the input AC power supply is sound, a signal for selecting a charging battery (Sn-A) is transmitted (Step S4), and the battery is charged. Next, the battery voltage is detected to determine whether or not the battery has been charged (step S5). If YES, the process returns to (step S1),
If NO, the process returns to (Step S4).

FIG. 3 is a time chart showing a charging / discharging mode in a UPS having n additional battery boxes. FIG. 3 (a) shows a charging mode, and FIG. 3 (b) shows a discharging mode. In the charging mode shown in FIG.
The battery B1 is charged by turning on the S1-A signal in the bidirectional switch circuit of the battery B1 of the PS1. B2 is charged. When the charging of the battery B2 is completed, the battery B3 is charged, and the charging mode of FIG. 3A is obtained. The discharge mode in FIG. 3B can be obtained in a similar manner, but the description is omitted.

[0013]

As described above, in the UPS having the additional battery box according to the present invention, the number of additional battery boxes that can be connected in parallel is not limited. Can be set. Also, since each of the additional battery boxes can be selected and used, the batteries before the end of their life can be effectively used by mixing new and old batteries.

[Brief description of the drawings]

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

FIG. 2 shows a conventional U type equipped with an additional battery box.
FIG. 2 is a block diagram showing a circuit configuration of a PS.

FIG. 3 is a time chart showing a charge mode and a discharge mode of a battery.

FIG. 4 is a flowchart.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply device (UPS) 2,3, n Additional battery box 4 Charging circuit 5 Inverter circuit 6 Capacitor 7,17,27 Control circuit 8,18,28 Communication circuit 9,19,29 Voltage sensor 12,22,32 Battery 10 , 11,20,21,30,31 switch circuit 13,14,23,24,33,34 drive circuit

Claims (2)

[Claims] A charging circuit for charging a built-in battery;
An inverter circuit that converts DC power into AC power and supplies it to a load, and a UPS configured by a built-in battery and a capacitor connected in parallel to the DC circuit between the charging circuit and the inverter circuit, and connected in parallel to the DC circuit. A plurality of additional battery boxes configured by connecting batteries to the plurality of series circuits, respectively; a bidirectional switch circuit comprising a voltage sensor and two switches in each of the DC circuits in the UPS and the plurality of additional battery boxes; And a control circuit for inputting a detection signal of the voltage sensor to control on / off of a bidirectional switch circuit, and performing communication type information transmission by a communication circuit provided in each of the UPS and a plurality of additional battery boxes. With a communication function installed in the UPS Battery box. 2. A control circuit in the UPS is provided with a function of inputting information such as a voltage value in the additional battery box via a communication circuit, and starting / stopping charging / discharging and selecting a priority of the additional battery box. 2. The unit according to claim 1, wherein each additional battery box has an address or signal identification function.
Additional battery box with communication function installed in PS.