JPH0564380A - Uninterruptible feeder - Google Patents

Abstract

PURPOSE:To make it possible to extend the back-up time. CONSTITUTION:A storage battery group is divided into two groups; a first storage battery group 6 and a second storage battery group 9. By means of the output of a power failure detector 2 and low voltage detector 4, both of the storage battery groups 6 and 9 are connected to the output of a charger 3 and the input of an inverter circuit 12 through relay contacts 5 and 8 when a commercial input voltage is normal and when the power's gone off, the storage battery group 9 is disconnected and when the output of the storage battery group 6 reaches a specified low voltage, the storage battery group 9 is connected again and the storage battery group 6 is disconnected. Meanwhile, a condition monitoring section 11 sends information about discharging as well as information about power failure, to a center. By this method, at the time of the back-up, while one storage battery group is in operation, the other storage battery group can be replaced with full-charged storage battery group. Besides, the end time of the back-up can be estimated from the information about discharging and thereby a reliability and a maintenability can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply device used for an uninterruptible power supply device, and more particularly to an uninterruptible power supply device for improving reliability and maintainability of a backup device of the CATV system. ..

[0002]

2. Description of the Related Art In a conventional backup circuit for a CATV uninterruptible power supply system, as shown in FIG. 2, both a storage battery group 6 and a storage battery group 9 are constantly connected to the output of a charger 3. Therefore, even when there is no commercial input voltage, the battery is uniformly discharged and current is supplied to the inverter circuit 12. The storage battery over-discharge prevention circuit 14 detects the voltage drop of the total storage battery and stops the inverter circuit 12. Moreover, in the state monitoring unit 11, only the power failure information is transferred to the center.

[0003]

As described above, in the conventional backup system for the CATV uninterruptible power supply, the discharge state of the storage battery is unclear after the occurrence of the power failure, and the remaining capacity of the storage battery is grasped. Can not. In addition, because the power failure continues and the voltage of the storage battery drops to some extent during operation of the inverter, even with two storage battery configurations, one battery cannot be easily replaced with a fully charged battery. Extension cannot be performed without interruption. That is, the conventional uninterruptible power supply device for CATV has a drawback of lowering reliability and maintainability.

It is an object of the present invention to provide an uninterruptible power supply system which improves reliability and maintainability by eliminating the above-mentioned drawbacks.

[0005]

According to the present invention, an input voltage state detecting means for detecting a state of a commercial input voltage, a charger for generating a charging voltage by the commercial input voltage, and an output of the charger are used for charging. In the uninterruptible power supply device including a storage battery group and an inverter circuit that generates an AC output from the output of the storage battery group, the storage battery group, the first storage battery group and the second storage battery group arranged in parallel Consists of
When the commercial input voltage is normal due to the voltage drop detection means connected in parallel to the first storage battery group and detecting the voltage drop thereof, and the outputs of the input voltage state detection means and the voltage drop detection means, The output and the input of the inverter circuit are connected to the first and second storage battery groups, the second storage battery group is disconnected when the commercial input voltage is abnormal, and the output voltage of the first storage battery group is up to a predetermined value. And a switching means for reconnecting the second storage battery group and disconnecting the first storage battery group when the battery voltage drops.

Further, the present invention is characterized by comprising state monitoring means for inputting the output of the input voltage state detecting means and the output of the voltage drop detecting means and transferring the input voltage state information and the discharge information to the center. To do.

Further, the present invention provides the uninterruptible power supply device,
It is preferably for CATV.

[0008]

The storage battery group is divided into two groups, a first storage battery group and a second storage battery group, and when the commercial input voltage is normal, these two are charged simultaneously. When the commercial input voltage is abnormal, the second storage battery group is disconnected, only the output of the first storage battery group is input to the inverter circuit, and when the output of the first storage battery drops to a predetermined value, The storage batteries are reconnected and the first storage battery group is disconnected.

Therefore, the switching between the first and second storage battery groups can be performed without interruption, and at the time of disconnection, the storage battery can be replaced with a fully charged storage battery to extend the backup time. ..

Further, since the state monitoring means transfers the discharge information of the first storage battery group to the center in addition to the input voltage state information, the backup end time can be predicted.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a main part of an embodiment of the present invention, showing a backup part of an uninterruptible power supply system for CATV.

In this embodiment, a power failure detector 2 as an input voltage state detecting means for detecting the state of the commercial input voltage input to the commercial power receiving terminal 1, and a charger 3 for generating a charging voltage by the commercial input voltage. In the uninterruptible power supply device including a storage battery group that is charged by the output of the charger 3 and an inverter circuit 12 that generates an AC output from the output of the storage battery group and outputs the AC output to an output terminal 13, Wherein, the storage battery group is composed of a first storage battery group 6 having a connector 7 arranged in parallel and a second storage battery group 9 having a connector 10 and connected in parallel to the storage battery group 6 and its voltage When the commercial input voltage is normal, the output of the charger 3 is the first and second by the low voltage detector 4 as the voltage drop detecting means for detecting the drop, and the outputs of the power failure detector 2 and the low voltage detector 4. Connected to both storage battery groups 6 and 9, and disconnects the storage battery group 9 when the commercial input voltage is abnormal, and when the output voltage of the storage battery group 6 drops to a predetermined value, connects the storage battery group 9 again and disconnects the storage battery group 6. A switching device having relay contacts 5 and 8 as switching means is provided.

Further, a state monitoring unit 11 as a state monitoring means for inputting the output of the power failure detector 2 and the output of the low voltage detector 4 and transferring the power failure information and the discharge information to the center.
Is equipped with.

Next, the operation of this embodiment will be described.

AC 100V is input from the commercial power receiving terminal 1, the power failure detector 2 is connected, and then the charger 3 is connected. The output of the charger 3 is connected to the storage battery group 6 via the relay contacts 5 on both the anode side and the cathode side, and at the same time, is connected to the storage battery group 9 via the relay contacts 8 so that the power failure detector 2 relays. Control contacts 5 and 8.
As a result, during commercial power reception, the two storage battery groups 6 and 9 are constantly charged.

Next, at the time of a power failure, only the relay contact 8 is broken by the power failure detector 2, the storage battery group 9 is disconnected from the inverter circuit 12, and the output terminal 13 can output only the current of the storage battery group 6.

Further, the power failure continues, and eventually the storage battery group 6
When the voltage reaches the cutoff voltage, the low voltage detector 4 connected in parallel to the storage battery group 6 operates to break the relay contact 5 and disconnect the storage battery group 6 from the inverter circuit 12, and at the same time the relay contact 8 is connected to the storage battery. It connects to the group 9 side, and only the storage battery group 9 is connected to the inverter circuit 12.

Further, when a power failure is expected for a long time,
During this operation time, the storage battery group 6 can be replaced with a new charged storage battery by the connector 7 without interruption. This allows
By the action of the low-voltage detector 4 again, the relay contact 5 is connected to the storage battery group 6 side at the same time, the relay contact 8 breaks, and the storage battery group 6 can back up again. Furthermore, during this operation, the storage battery group 9 is replaced with a new storage battery that has been charged by the connector 10, and by repeating this operation, it is possible to extend the backup time during inverter operation without interruption. Becomes

Further, by transferring the power failure information and the discharge information of the storage battery group 6 to the center by the state monitoring unit 11, it is possible to grasp the result of the time when 1/2 of the total discharge capacity is consumed and investigate the discharge current of the storage battery. You can also estimate the remaining backup time without doing so.

Although the above description has been made for the uninterruptible power supply device for CATV, the present invention is similarly applied to the uninterruptible power supply device for other similar systems.

[0022]

As described above, according to the present invention, in two storage battery groups connected in parallel, when a power failure occurs, the backup operation is first started by only one storage battery group, and the voltage of this storage battery group is detected. At the time of completion of discharging, it automatically switches to the other storage battery group next time, and since it has means for notifying the center of power failure information and storage battery switching information,
Since the backup end time can be predicted and the two storage battery groups can be replaced without interruption during the operation of the inverter, the backup time can be easily extended and the reliability and maintainability are significantly improved.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a main part of a conventional example.

[Explanation of symbols]

 1 Commercial power receiving terminal 2 Power failure detector 3 Charger 4 Low voltage detector 5, 8 Relay contact 6, 9 Storage battery group 7, 10 Connector 11 Status monitoring unit 12 Inverter circuit 13 Output terminal 14 Over discharge prevention circuit

Claims (3)

[Claims] 1. An input voltage state detecting means for detecting a state of a commercial input voltage, a charger for generating a charging voltage by the commercial input voltage, a storage battery group charged by an output of the charger, and a storage battery group. In an uninterruptible power supply including an inverter circuit that generates an AC output from the output of the storage battery group, the storage battery group is composed of a first storage battery group and a second storage battery group arranged in parallel, the first When the commercial input voltage is normal, the voltage drop detecting means connected in parallel to the storage battery group and detecting the voltage drop thereof, and the outputs of the input voltage state detecting means and the voltage drop detecting means, the output of the charger and the inverter The input of the circuit is connected to the first and second storage battery groups, when the commercial input voltage is abnormal, the second storage battery group is disconnected, the output voltage of the first storage battery group And a switching means for reconnecting the second storage battery group and disconnecting the first storage battery group when the power storage voltage has decreased to a predetermined value. 2. The uninterruptible power supply system according to claim 1, wherein the output of the input voltage state detecting means and the output of the voltage drop detecting means are input and the state monitor for transferring the input voltage state information and the discharge information to the center. An uninterruptible power supply device characterized by comprising means. 3. The uninterruptible power supply device according to claim 1, wherein the uninterruptible power supply device is for a CATV.