JPH07203090A - No hit power feeding system and remote power feeding system - Google Patents

Abstract

PURPOSE:To enable the back up of the power feeding system without hit by operating a stand-by protection power feeding unit when the power capacity is exceeded by monitoring the state of using power at all times. CONSTITUTION:In the no hit power feeding system, a stand-by protection power feeding unit 18 is provided. Seven diodes 115 are provided on the unit 18. The output is supplied to a power feeding unit 11 and similar units, and units 15, 16, and 17. In the units 11-17 and the unit 18, the output from a power feeding voltage monitor circuit 111, power feeding current monitor circuit 112, that is, the output voltage from each power feeding unit and the output current of the power feeding unit are monitored. The output from an output interruption detection circuit 113 is inputted to a circuit for monitoring the stopped monitor which is not illustrated. An inventory circuit 114 is constructed by a ROM. By using it, the units 11-17, 18 are monitored. Thus, when the power feeding voltage value exceeds the prescribed value, the unit 18 is controlled to continue the power feeding capacity at the time of excess load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-interruptible power supply system, and more particularly to a non-interruptible power supply system capable of backing up the power supply capacity of a device to be supplied when it is overloaded. Further, the present invention relates to a remote power supply system that employs this non-interruptible power supply system.

[0002]

2. Description of the Related Art With the development of communication technology, an optical communication device has been introduced between a switchboard and a subscriber, and a wideband frequency information service including images as well as voice is required, and the demand is met in North America. The system to do is being introduced.

In such a system, it is ideal that the optical transmission line is led to the subscriber's house, where the optical signal is converted into an electric signal or the optical signal is converted into a video signal and provided. However, at present, the system is in the stage of trial manufacture, and it is equipped with a subscriber terminal device that switches from optical to electrical in the vicinity of the subscriber's premises, from which the usual telephone service will be provided to the subscriber as in the past. It is a thing.

Specifically, a common power receiving device including a function of changing from light to electricity, that is, a subscriber terminal device is installed in the homes of 4 to 6 subscribers, and further, in a place remote from the subscriber terminal device. It has a distant power supply system in which one power supply device is provided for the upper power supply device for about 100 subscribers.

In a wideband frequency information service system using such a power supply system, the power to be supplied differs depending on the number of subscribers or the usage of telephones of subscribers, that is, the amount of information to be supplied. A situation occurs in which the power supply capacity is exceeded.

However, even in such a case, it is desired to maintain service provision without interruption. For this reason, in the conventional power supply system, a battery backup system is provided for the device to be supplied with power, that is, the above-mentioned subscriber terminal device, and it is a system that backs up only at an arbitrary time, for example, during peak hours of telephone use.

[0007]

However, such a conventional power feeding system cannot easily back up the power feeding capability of the subscriber terminal device when it is overloaded. That is, if the power supply capacity increases due to an increase in the number of subscribers, the power supply capacity cannot be easily increased.

Further, the probability of failure of the power supply cable is higher than that of other failure modes. Moreover, although an engine generator is connected and backup is also performed before the battery capacity runs out, it takes a very long time to recover because it searches for a cable failure, so it takes time and money to recover normally. The problem has arisen.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a power supply system which solves the problems.

[0010]

A non-interruptible power supply system according to the present invention has a plurality of power supply units, a backup protection power supply unit, and a control unit, and the control unit determines the power usage status of a load. It is configured to monitor and, when the predetermined power capacity is exceeded, operate the backup protection power supply unit to back up the power supply of the plurality of power supply units.

Further, the control unit detects a ground fault or a short circuit state of output power of the plurality of power feeding units,
It is configured to open the detected output line of the corresponding power supply unit, measure the line impedance, and search for the fault location.

Further, the outputs of the plurality of power feeding units and the protection power feeding unit of the spare are diode-or coupled.

Further, the remote power feeding system of the present invention is configured to feed power to the subscriber terminal device at a remote place from the hitless power feeding system.

A rectifier circuit unit for converting an AC power source into a direct current, as a power source for the non-interruptible power feeding system,
When the power supply from the rectifier circuit unit has a battery and an engine type DC generator, the power is supplied from the battery, and the power is supplied from the engine type DC generator before the power capacity of the battery decreases. Composed.

[0015]

According to the present invention, the control unit constantly monitors the use of electric power, and when the power capacity is about to be exceeded, the protection power supply unit for backup is operated. This makes it possible to back up the operation of the power supply system without interruption.

Further, since the output line is opened and the line impedance is measured when the power supply output is ground-faulted or short-circuited, it is possible to accurately search for the fault position.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram for explaining a distant power supply system adopting the non-interruptible power supply system of the present invention.

In the figure, reference numerals 1 to 3 represent an uninterruptible power supply system of the present invention, which will be described later, and three sets of uninterruptible power supply systems are provided. Reference numerals 10, 20 and 30 denote fuses / alarm circuits for the corresponding uninterruptible power supply systems 1 to 3, respectively.

The fuse / alarm circuits 10, 20 and 30 are a DC-48V primary power source input fuse and a fuse alarm sending circuit, and one of the power major / power minor or the uninterruptible power supply systems 1 to 3 is not provided. When activated, a contact signal is sent to the output / protection circuit 7 to protect the inoperative non-interruptible power supply system.

Reference numeral 4 is a rectifier unit, which is an alternating current 1 supplied from an electric power company in the area where the non-interruptible power supply system is installed.
It is a circuit that converts 17V power into -48V DC power and supplies it to each of the uninterruptible power supply systems 1 to 3.

Reference numeral 5 denotes a battery, which directly supplies DC power when the power supply from the rectifier unit 4 is stopped. Further, 6 is an engine type DC generator, and since the power supply time by the battery 5 is limited, it is for backing up this when power supply from the battery 5 is required for a long time due to maintenance or the like. is there.

Further, 7 is an output / protection circuit, which outputs the output of -130 VDC from the non-interruptible power supply systems 1 to 12.
It is a circuit that branches and adds surge protection to each output line. The power from this circuit is supplied to a subscriber terminal device at a remote location which is branched off into 12 branches.

FIGS. 2 and 3 are block diagrams of one configuration of the non-interruptible power supply systems 1 to 3 of FIG. As an example, a set of uninterruptible power supply systems shown in FIGS. 2 and 3 is housed in one shelf. Further, it is configured to include seven power feeding units (# 1 to # 7) 11 to 17, a backup protection power feeding unit (#P) 18 and a control unit 19 (see FIG. 3).

Further, 21 to 27 are power feeding units (#
1 to # 7) Power output from each of 11 to 17 for supplying power to a plurality of subscriber terminals. In FIG. 2, the power supply units # 2 and # 3 are not shown.

Each of the seven power supply units # 1 to # 7 has the same structure, and includes a DC / DC converter control circuit 110 including a power transistor, a coil, and a control circuit, a power supply voltage monitor circuit 111, and a power supply current monitor circuit 11.
2. The output detection monitor 113 and the inventory circuit 114 are included.

Further, it has a diode 115. This diode 115 serves as a backup protection power supply unit (#P).
It is provided to supply the power supplied from 18 and the diode OR.

Therefore, the spare protective power supply unit (#
P) 18 has seven diodes 115 and is connected to power the outputs of the seven power feeding units (# 1 to # 7) 11 to 17 and the diode OR.
The configuration is the same as that of the two power feeding units (# 1 to # 7) 11 to 17.

Here, the power supply units (# 1 to # 7) 11
˜17 and the spare protection power supply unit (#P) 18, the outputs of the power supply voltage monitor circuit 111 and the power supply current monitor circuit 112, that is, the output voltage and output current of each power supply unit are monitored, and the control unit 19 (see FIG. 3). ) Is fed to the performance monitor 193.

The output disconnection detection output from the output disconnection detection circuit 113 is input to the disconnection monitor monitoring circuit 190 of the control unit 19. The inventory circuit 114 is composed of a ROM, and the manufacturing date of each of the power supply units (# 1 to # 7) 11 to 17 and the spare protection power supply unit (#P) 18 and the name of the unit are managed and registered here. It

In the control unit 19 shown in FIG. 3, the feed power value performance monitor circuit 193 includes a feed voltage monitor circuit 111 and a feed current monitor circuit 112.
The output from is monitored, and the monitoring result is converted into a digital value for calculation to obtain a power value. The calculated power value is input to the CPU 195.

The CPU 195 monitors the output of the power supply power value performance monitor circuit 193 once per minute with an accuracy of ± 1 VA, and stores data of an arbitrary period in the RAM 196.
Accumulate in.

During this period, if the voltage exceeds 90 VA, the CPU
195 ON-controls the spare protection power supply unit (#P) 18 which is OFF-controlled, and gives an average 14 VA margin to this power supply device, and exceeds 100 VA and 114V.
It corresponds to the addition up to A.

A spare protective power supply unit (#P) 18 is provided.
In order to individually control the ON of each of the power supplies, the inventory management circuit 192 of the control unit 19 reads the inventory information stored in the inventory ROM 114 of the spare protection power supply unit (#P) 18, and the CPU 1 reads the inventory information.
By detecting at 95, the backup protection power supply unit (#P) 18 is specified. Then, under the control of the CPU 195, the ON / OFF control circuit 191 controls the specified backup protection power supply unit (#P) 18 to be turned ON.

The disconnection monitor monitoring circuit 190 inputs the detection output from the output disconnection detection monitor 113, and when the disconnection is detected, inputs it to the CPU 195.

When the disconnection is detected, it means that the power supply output is grounded or short-circuited. Therefore, the CPU 195 is
When this is recognized, the -130V DC output of the DC / DC converter control circuit 110 in which the disconnection is detected is disconnected, the impedance measurement circuit is connected to the corresponding power supply line of the power supply lines 21 to 27, and the cable fault position is obtained. , Repair as soon as possible.

In FIG. 3, reference numeral 194 denotes a provisioning circuit, that is, an initial setting circuit, which sets defaults of the power supply units (# 1 to # 7) 11 to 17 and the spare protection power supply unit (#P) 18. The default circuit when each unit is inserted is OFF. Then, information about which unit is connected to the power receiving device is input to the provisioning circuit 194.

The CPU 195 recognizes this and turns on / off.
ON / OFF of each unit by controlling the F control circuit 191
Switch.

FIG. 4 is a diagram in which the power supply capability of the non-interruptible power supply system when considering the average power consumption is considered. The first power supply unit (# 1) 11 in FIG. 2 will be considered, but the same configuration applies to the other power supply units 12 to 17.

When the fixed supply voltage is -130 VDC and the maximum is 100 VA, the total maximum current capacity is 0.76.
923A or less.

10 subscriber terminal units ONU-A
For # 1 to # 10, each subscriber terminal device
Design to connect up to 12 subscriber terminals (POTS).

Therefore, for example, the current capacity i (1) = i (2) = 0.16547 for the first and second power feed lines.
The current capacity i (3) = i for the A, third, and fourth feeders
(4) = 0.1195A, current capacity i (3) = 0.0320A is supplied to the fifth power supply line, and current capacity i (3) = 0.0320A is supplied to the sixth to tenth power supply lines. Therefore, the total current capacity i (T) = 0.76923A is designed.

However, when all the subscribers are in a busy state, the maximum value exceeds 100 VA. In such a case,
In the present invention, the control unit 19 detects an increase in load, and current is supplied from the protection power supply unit (#P) 18 as a backup, so that it is possible to maintain non-interruption.

[0043]

As described above, the present invention has been described according to the embodiments. According to the present invention, a margin of about 14% can be provided for the shortage of power supply capacity with respect to an increase in load. Therefore, there is a low probability that the system will fail. At the same time, fault search is shortened, the load on the backup power source is reduced, and maintenance costs can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a distant power supply system that employs a hitless power supply system of the present invention.

FIG. 2 is a block diagram (part 1) of the embodiment of the non-interruptible power supply system of the present invention.

FIG. 3 is a block diagram (No. 2) of the embodiment of the non-interruptible power supply system of the present invention.

FIG. 4 is a diagram for considering the power supply capability of a non-interruptible power supply system when considering average power consumption.

[Explanation of symbols]

 1-3 Non-interruptible power supply system 4 Rectifier unit 5 Battery 6 Engine type DC generator 7 Output / protection circuit 11-16 Power supply unit 18 Spare protection power supply unit 19 Control unit 110 DC / DC converter control circuit 111 Power supply voltage monitor circuit 112 Power supply current monitor circuit 113 Output disconnection detection circuit 114 Inventory circuit 115 Diode 190 Disconnection monitor monitoring circuit 191 ON / OFF control circuit 192 Inventory management circuit 193 Power supply power performance monitor 194 Provisioning circuit 195 CPU 116 RAM

Claims (5)

[Claims] 1. A plurality of power supply units (11 to 17), a backup protection power supply unit (18), and a control unit (19), wherein the control unit (19) monitors the usage status of the power of the load. However, when the predetermined power capacity is exceeded, the backup protection power supply unit (18) is operated, and the plurality of power supply units (1
1 to 17), which is configured to back up the supply power of 1) to 17). 2. The power supply unit according to claim 1, wherein the control unit (19) further detects a ground fault or a short circuit state of output power of the plurality of power supply units (11 to 17), and detects the corresponding power supply. Unit (11-1
An uninterruptible power supply system characterized in that the output line of 7) is opened, the line impedance is measured, and the fault position is searched. 3. The uninterruptible power supply system according to claim 1, wherein the outputs of the plurality of power supply units (11 to 17) and the auxiliary protection power supply unit (18) are diode-or coupled. . 4. A remote power feeding system adapted to feed power to a subscriber terminal device at a remote place from the non-interruptible power feeding system according to any one of claims 1 to 3. 5. The rectifier circuit unit (4) for converting an AC power source into a direct current, a battery (5) and an engine type direct current generator (6) as a power source of the non-interruptible power supply system according to claim 4. , When the power supply from the rectifying circuit unit (4) is stopped,
A distant power supply system characterized in that power is supplied from the battery (5), and power is supplied from the engine type DC generator (6) before the power capacity of the battery (5) decreases.