JP4223423B2 - Uninterruptible power supply, subscriber side device and communication system - Google Patents

Description

  The present invention relates to an uninterruptible power supply device, a subscriber-side device, and a communication system that are used in communication equipment and the like and have a battery for backing up commercial power.

As a conventional uninterruptible power supply, an AC / DC conversion part for converting commercial power into DC voltage, and a DC voltage converted by the AC / DC conversion part into a predetermined DC voltage and supplied to a load / DC conversion portion, a charging circuit for supplying and charging a DC battery converted by the DC / DC conversion portion to a detachable backup battery, an output voltage of the charging circuit is detected, and the detected voltage is predetermined. And a voltage detection circuit that determines that the backup battery is not connected when the threshold is exceeded.
In this backup battery unconnected state confirmation method, when a backup battery is connected, current flows to the backup battery when the commercial power is turned on, and a voltage drop occurs in the output voltage of the charging circuit. Therefore, it is determined that the backup battery is connected when the voltage detected by the voltage detection circuit is less than the predetermined threshold. In addition, when the backup battery is not connected, no voltage drop occurs in the output voltage of the charging circuit even when the commercial power is turned on. It is determined that the backup battery is not connected (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-14130

Since the conventional uninterruptible power supply is configured as described above, the unconnected state of the backup battery can be confirmed only when the power is turned on.
Therefore, even if the connection status of the backup battery can be confirmed when the power is turned on, if the backup battery is replaced during maintenance, etc. during normal operation, the connection status cannot be confirmed. In such a case, there is a problem that the commercial power source cannot be backed up even if a power failure occurs.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain an uninterruptible power supply apparatus, a subscriber-side apparatus, and a communication system capable of confirming a connection state of power storage means even during normal operation. To do.

The uninterruptible power supply device according to the present invention detects a voltage monitoring means for detecting the voltage of the output section to the power storage means of the charging means, and detects the input of the power supply voltage to the DC voltage converting means, and at the time of detecting the input, the charging means It stops the charging of the storage means from the normal operation of power supply of the power supply voltage to DC voltage conversion means is continuous, intermittently stopping the charging of the electricity storage means from the charging means, stopping their charge And control means for determining that the power storage means is not connected when the voltage detected by the voltage monitoring means is below a preset threshold value.

According to the present invention, there is an effect that the connection state of the power storage means can be confirmed not only when the power is turned on but also during normal operation.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing an optical fiber communication system according to Embodiment 1 of the present invention, and shows an application example of the uninterruptible power supply of the present invention.
In the figure, an in-home device (subscriber side device) 1 includes a communication unit (communication means, load) 2 that communicates with a station side device 4 through an optical fiber (communication path) 5, and a predetermined direct current to the communication unit 2. It is comprised from the power supply part 3 which supplies a voltage. The AC / DC conversion unit 6 converts the commercial power supply AC into a DC voltage and supplies it to the power supply unit 3. The battery (power storage means) 7 is detachably attached to the power supply unit 3 and supplies power to the communication unit 2 instead of the power supply when the commercial power supply AC is out of power.
This in-home device 1 can operate even if the battery 7 is not connected as long as the commercial power supply AC is supplied. When the battery 7 is not connected to the power supply unit 3, the unconnected state is indicated as a power source. The unit 3 detects and communicates an unconnected alarm to the station side device 4 from the communication unit 2 through the optical fiber 5.

FIG. 2 is a block diagram showing the uninterruptible power supply according to Embodiment 1 of the present invention, which comprises power supply unit 3 and battery 7 shown in FIG.
In the power supply unit 3, the direct current / direct current conversion unit (direct current voltage conversion means) 11 is constituted by an insulating switching type DC / DC converter, and a direct current voltage of −48 Vdc supplied from the alternating current / direct current conversion unit 6 is obtained. For example, the voltage is converted to a DC voltage such as 17 Vdc. The diode 12 is connected to the output side of the direct current / direct current converter 11 and supplies power from the battery 7 to the communication unit 2 when the commercial power supply AC is interrupted, but prevents the current from flowing backward. The direct current / direct current converter 13 is constituted by an insulation type switching DC / DC converter, and the direct current voltage supplied from the direct current / direct current converter 11 via the diode 12 is, for example, 3.3 Vdc, 5 Vdc, This is converted to a DC voltage such as 30 Vdc and supplied to the communication unit 2.
The charging circuit unit (charging means) 14 is constituted by an insulated three-terminal regulator, and charges the DC voltage supplied from the DC / DC converting unit 11 to the connected battery 7 with a constant voltage of 13.5 Vdc, for example. Is. The charging circuit unit 14 is configured to be able to control charging and charging stop by on / off controlling a three-terminal regulator by an input of a photocoupler. The voltage monitoring circuit unit (voltage monitoring means) 15 is constituted by a power supply voltage monitoring IC, and detects the voltage between the charging circuit unit 14 and the battery 7. More specifically, the voltage of the output part of the charging circuit part 14 is detected.

The control unit (control means) 16 recognizes the input of the commercial power supply AC using a programmable logic device (PLD) using the output voltage 5Vdc of the DC / DC conversion unit 13, and when the commercial power supply AC is turned on, the charging circuit unit 14, when charging to the battery 7 is stopped and the voltage detected by the voltage monitoring circuit unit 15 is equal to or lower than the threshold Vth when the charging is stopped, it is determined that the battery 7 is not connected, and power is supplied from the commercial power supply AC. During the normal operation in which the charging is continued, the charging of the battery 7 from the charging circuit unit 14 is periodically stopped, and the battery 7 is not connected when the voltage detected by the voltage monitoring circuit unit 15 is equal to or lower than the threshold Vth when the charging is stopped. It is determined that it is in a state. The determination of the unconnected state is transmitted to the communication unit 2 and communicated from the communication unit 2 to the station side device 4 through the optical fiber 5 as an unconnected alarm.
The diode 17 is connected between the input of the battery 7 and the direct current / direct current conversion unit 13 and prevents reverse current flow.
In the first embodiment, as shown in FIG. 2, the battery 7 is configured to be installed outside the power supply unit 3.

Next, the operation will be described.
FIG. 3 is a flowchart showing the operation of the uninterruptible power supply according to Embodiment 1 of the present invention, and FIG. 4 is a timing chart showing the operation of the uninterruptible power supply according to Embodiment 1 of the present invention.
In FIG. 1 to FIG. 3, when the commercial power source AC is turned on to the power source unit 3 through the AC / DC converter 6 (step ST 1), the communication unit through the DC / DC converter 11, the diode 12, and the DC / DC converter 13. 2 is supplied with a predetermined DC voltage, and the communication unit 2 becomes operable. The control unit 16 recognizes that the power is turned on using the PLD using the output voltage 5Vdc of the DC / DC conversion unit 13, and once initializes that the battery 7 is not connected (step ST2). Further, the photocoupler of the charging circuit unit 14 is controlled to be turned off, and charging from the charging circuit unit 14 to the battery 7 is stopped (step ST3), and a voltage detected by the voltage monitoring circuit unit 15 when the charging is stopped is input. Then, the detected voltage is compared with a preset threshold value Vth (step ST5). When the detected voltage is equal to or lower than the threshold value Vth, it is determined that the battery 7 is not connected.
This is because, when the power is turned on, the charging voltage in the previous normal operation remains in the battery 7, and if the battery 7 is connected to the power supply unit 3, a charging voltage equal to or higher than the threshold value Vth is detected. It is. In addition, even when the power is turned on after the new battery 7 is connected, the new battery 7 is normally connected after the new battery 7 is sufficiently charged. If it is in the state, a charging voltage equal to or higher than the threshold value Vth is detected.
This determination of the unconnected state is transmitted to the communication unit 2 and communicated from the communication unit 2 to the station side device 4 through the optical fiber 5 as an unconnected alarm.

On the other hand, when the detected voltage at power-on exceeds the threshold value Vth, it is determined that the battery 7 is in a connected state (step ST6). Thereby, the control unit 16 controls the photocoupler of the charging circuit unit 14 to be turned on, and charges the battery 7 from the charging circuit unit 14.
Here, during normal operation in which power supply from the commercial power supply AC is continued, charging of the battery 7 from the charging circuit unit 14 is periodically performed by controlling the photocoupler of the charging circuit unit 14 on and off by the control unit 16. (Step ST7), the voltage detected by the voltage monitoring circuit unit 15 when charging is stopped is input, and the detected voltage is compared with a preset threshold value Vth (step ST8). Similarly to the above, when the detected voltage is equal to or lower than the threshold value Vth, it is determined that the battery 7 is not connected (step ST2), and this determination of the unconnected state is transmitted to the communication unit 2, and the communication unit 2 transmits the optical fiber 5 Is communicated to the station side device 4 as an unconnected alarm.
On the other hand, when the detected voltage during normal operation exceeds the threshold value Vth, it is determined that the battery 7 is connected.
FIG. 4 shows the output voltage of the charging circuit unit 14 and the voltage of the output unit of the charging circuit unit 14 at that time. Since the voltage monitoring circuit unit 15 monitors the voltage of the output unit of the charging circuit unit 14 when the charging from the charging circuit unit 14 to the battery 7 is stopped, the charging voltage output from the charging circuit unit 14 is detected. Therefore, the charging voltage of the battery 7 can be monitored, and the unconnected state or the connected state of the battery 7 can be determined based on whether or not it is equal to or lower than the threshold value Vth.

  In FIG. 2, the output voltage of the DC / DC converter 11 is substantially zero at the time of a power failure of the commercial power supply AC, but if the battery 7 is connected to the power supply 3, the power supply of the battery 7 is connected to the diode 17. Is supplied to the DC / DC conversion unit 13, and the DC / DC conversion unit 13 can convert the power to a predetermined DC voltage and supply it to the communication unit 2, thereby backing up the commercial power source AC. it can. At this time, the diode 12 prevents a closed circuit from returning from the battery 7 to the battery 7 via the diode 17 and the charging circuit unit 14.

As described above, according to the first embodiment, when the commercial power supply AC is turned on, the charging from the charging circuit unit 14 to the battery 7 is stopped, and the detected voltage by the voltage monitoring circuit unit 15 is the threshold value Vth when the charging is stopped. In the following cases, it is determined that the battery 7 is not connected, and charging from the charging circuit unit 14 to the battery 7 is periodically stopped during normal operation in which power supply from the commercial power source AC is continued. By determining that the battery 7 is not connected when the voltage detected by the voltage monitoring circuit unit 15 is equal to or lower than the threshold Vth when the charging is stopped, the battery 7 can be removed not only when the power is turned on but also during normal operation. Even in the case of replacement, the connection state of the battery 7 can be confirmed.
When the battery 7 is not connected to the power supply unit 3, the in-home device that can communicate with the station side device 4 from the communication unit 2 through the optical fiber 5 with the unconnected state as an unconnected alarm. 1 and an optical fiber communication system.
Furthermore, since the battery 7 is configured to be installed outside the power supply unit 3, maintenance management such as replacement of the battery 7 can be facilitated. Further, since the input of the power supply unit 3 is −48 Vdc input of the DC / DC conversion unit 11, it can be effectively installed when installed in a telephone station.

  In the first embodiment, the charging from the charging circuit unit 14 to the battery 7 is periodically stopped during the normal operation in which the power supply from the commercial power supply AC is continued. Instead, it may be simply stopped intermittently.

Embodiment 2. FIG.
FIG. 5 is a block diagram showing an uninterruptible power supply according to Embodiment 2 of the present invention. The AC / DC converter converts the commercial power supply AC into a DC voltage and supplies it to the DC / DC converter 11 in the power supply 3. Part (AC / DC voltage converting means) 6 is incorporated. Other configurations are the same as those in FIG.
As described above, the AC / DC conversion unit 6 is configured to be taken into the power supply unit 3, whereby the entire configuration including the AC / DC conversion unit 6 can be reduced in size. Further, as the input of the power supply unit 3, a commercial power supply AC can be used, and versatility can be improved.

Embodiment 3 FIG.
FIG. 6 is a block diagram showing an uninterruptible power supply according to Embodiment 3 of the present invention, in which a battery 7 is further incorporated into the power supply unit 3. Other configurations are the same as those in FIG.
As described above, since the AC / DC conversion unit 6 and the battery 7 are configured to be taken into the power supply unit 3, the entire configuration including the AC / DC conversion unit 6 and the battery 7 can be reduced in size. it can. Further, as the input of the power supply unit 3, a commercial power supply AC can be used, and versatility can be improved.

1 is a block diagram showing an optical fiber communication system according to Embodiment 1 of the present invention. It is a block diagram which shows the uninterruptible power supply by Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the uninterruptible power supply by Embodiment 1 of this invention. It is a timing chart which shows operation | movement of the uninterruptible power supply by Embodiment 1 of this invention. It is a block diagram which shows the uninterruptible power supply device by Embodiment 2 of this invention. It is a block diagram which shows the uninterruptible power supply by Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 In-home apparatus (subscriber side apparatus) 2 Communication part (communication means, load) 3 Power supply part 4 Station side apparatus 5 Optical fiber (communication path), 6 AC / DC conversion part (AC / DC voltage conversion means) , 7 Battery (power storage means), 11 DC / DC conversion section (DC voltage conversion means), 12, 17 Diode, 13 DC / DC conversion section, 14 Charging circuit section (charging means), 15 Voltage monitoring circuit section (voltage monitoring) Means), 16 control section (control means).

Claims (6)

DC voltage conversion means for transforming the power supply voltage and supplying a predetermined DC voltage to the load;
Power storage means that is attachable and detachable, and supplies power to the load instead of the power supply in the event of a power failure;
Charging means for supplying a DC voltage generated from the DC voltage converting means to the power storage means;
Voltage monitoring means for detecting the voltage of the output section of the charging means to the power storage means;
Detection of the supply of power supply voltage to the DC voltage conversion means is detected, and when charging is detected, charging from the charging means to the power storage means is stopped and supply of power supply voltage to the DC voltage conversion means is continued. that during normal operation, from the charging means intermittently stops the charging of the electricity storage means, the storage means when the voltage is below a preset threshold value which is detected by the voltage monitoring means during their charge stop An uninterruptible power supply comprising control means for determining that the connection is not established.   The uninterruptible power supply according to claim 1, wherein the power storage means is installed outside the uninterruptible power supply.   2. The uninterruptible power supply according to claim 1, further comprising AC / DC voltage conversion means for converting an AC commercial power supply into DC voltage and supplying the DC voltage to the DC voltage conversion means. AC voltage conversion means for converting AC commercial power into DC voltage and supplying the voltage to DC voltage conversion means,
The uninterruptible power supply according to claim 1, wherein the power storage means is installed so as to be taken into the uninterruptible power supply. An uninterruptible power supply that supplies a predetermined DC voltage to the communication means,
The uninterruptible power supply is
DC voltage conversion means for transforming a power supply voltage and supplying a predetermined DC voltage to the communication means;
Power storage means that is attachable and detachable, and supplies power to the communication means instead of the power supply in the event of a power failure;
Charging means for supplying a DC voltage generated from the DC voltage converting means to the power storage means;
Voltage monitoring means for detecting the voltage of the output section of the charging means to the power storage means;
Detection of the supply of power supply voltage to the DC voltage conversion means is detected, and when charging is detected, charging from the charging means to the power storage means is stopped and supply of power supply voltage to the DC voltage conversion means is continued. that during normal operation, from the charging means intermittently stops the charging of the electricity storage means, the storage means when the voltage is below a preset threshold value which is detected by the voltage monitoring means during their charge stop Control means for determining that it is in an unconnected state,
The subscriber unit, wherein the communication unit communicates an unconnected alarm to the outside when the control unit determines that the power storage unit is not connected. A subscriber-side device that communicates with a station-side device through a communication path;
The subscriber side device comprises an uninterruptible power supply for supplying a predetermined DC voltage to the communication means,
The uninterruptible power supply is
DC voltage conversion means for transforming a power supply voltage and supplying a predetermined DC voltage to the communication means;
Power storage means that is attachable and detachable, and supplies power to the communication means instead of the power supply in the event of a power failure;
Charging means for supplying a DC voltage generated from the DC voltage converting means to the power storage means;
Voltage monitoring means for detecting the voltage of the output section of the charging means to the power storage means;
Detection of the supply of power supply voltage to the DC voltage conversion means is detected, and when charging is detected, charging from the charging means to the power storage means is stopped and supply of power supply voltage to the DC voltage conversion means is continued. that during normal operation, from the charging means intermittently stops the charging of the electricity storage means, the storage means when the voltage is below a preset threshold value which is detected by the voltage monitoring means during their charge stop Control means for determining that it is in an unconnected state,
The communication unit of the subscriber side device communicates an unconnected alarm to the station side device through the communication path when the control unit determines that the power storage unit is not connected. Communications system.

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