JP2727985B2 - Power supply system for optical terminal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system for an optical terminal device using a countermeasure against a power outage of commercial power and solar energy.

[0002]

2. Description of the Prior Art As shown in FIG.
A DC voltage is obtained in the rectifier circuit 18 through one of the secondary windings of the transformer 17 and supplied to the load 23, and the voltage is supplied to the switching circuit 1 through the control circuit 22.
6 and is stabilized. At the same time, the battery 8 is charged from the other secondary winding of the transformer 17 via the rectifier circuit 19 and the charger 6, and power is supplied from the battery 8 to the load 23 via the stabilizing circuit 20 and the diode 21. I have.

Here, the output voltage of the rectifier circuit 18 is V1,
Assuming that the output voltage of the stabilizing circuit 20 is V2 and the voltage drop of the diode 21 is Vf, a relationship of V1> V2-Vf is established. Therefore, when the rectifier circuit output voltage is the same, in a so-called normal state where commercial power is supplied, power is supplied to the load 23 from the rectifier circuit 18 having a higher voltage than the stabilization circuit 20. . In a state where commercial power is not supplied, that is, in a power failure state, the load 2 is automatically and instantaneously interrupted from the battery 8 via the stabilizing circuit 20 and the diode 21.
3 is supplied with power. Thus, the telephone 15 can be sounded even when the commercial power is interrupted.

However, in this method, the backup function occupies a large volume in the apparatus volume, and the cost of the backup function occupies a considerable part. However, this backup function is supplied from commercial power although it is not normally used. In the normal state, the power consumed by the backup unit was wasted. On the other hand, in terms of power supply, the cost of securing land, etc. has increased in response to power demand due to the increase in these electronic devices, and power supply has not been able to keep up.
In optical terminal equipment, which is expected to increase rapidly in the future,
There is an urgent need for uninterruptible power and power saving. Under such conditions, the sale of surplus power due to reverse power flow has been approved since 1994, and solar power generation has attracted attention. For example, Japanese Unexamined Patent Publication No.
Japanese Unexamined Patent Publication (Kokai) No. 2-20714 proposes that surplus power generated by private power generation be sold to a power company.
JP-A-57894 and JP-A-56-53467 disclose methods of measuring the amount of electric power.

[0005]

However, in such a method, it is necessary to prepare a transmission line and a communication device in order to transmit the result of meter reading, and in reality, such equipment is arranged only for meter reading. Doing so has a problem that it is unprofitable and difficult to realize. The present invention has been made in view of such a situation, and is capable of managing the amount of power generated and the amount of purchased power with good profitability.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention supplies power generated by a solar cell to an optical terminal device during the daytime and supplies surplus power to commercial power while charging the battery. feeding the side, provided a power failure is privately generated power supply unit supplies the battery power to the optical terminal equipment, and a commercial power supply for supplying commercial power when not be supplied with power from the private power generation unit, commercial power it is obtained by the amount of power supplied from the electric energy and the commercial power side sent out to the side so as to sent to the transmission path via the optical terminal equipment.

[0007]

In the daytime, photovoltaic power is generated, the power is supplied to the apparatus by converting the photovoltaic power into AC power, the backup battery is charged, surplus power is sold to a power company, and commercial power is used at night. In addition, at the time of nighttime power failure or daytime power failure when solar power cannot be generated, the battery operates with the charged battery power. Also, the amount of power sent to the commercial power side and the commercial power
The amount of power supplied from the power side is transmitted via the optical
Will be sent to

[0008]

FIG. 1 is a block diagram showing one embodiment of the present invention. A commercial power supply 1 is a series circuit of electronic watt-hour meters 2 and 3, a normally closed contact of a relay 4, and a normally closed contact of a relay 11. Is connected to the output terminal 12. On the other hand, the output of the solar cell 5 is supplied to the battery 8 through the charger 6 and the A contact (normally closed contact) of the relay 7 and the movable contact of the relay 7 so that the battery 8 is charged with the power generated by the solar power. Has become. The output of the solar cell 5 is supplied to a normally-closed contact of the relay 9 and a connection portion of the contact between the relay 4 and the relay 11 via the inverter 10. Relay 7
B contact (operation contact) is connected to the input side of the inverter 10.

The optical terminal device 13 is connected to a telephone 15, supplied with power information from the watt meters 2 and 3, and transmitted to the transmission line 14. A relay coil 4a and a relay coil 7a are connected to the commercial power 1 side. When commercial power is supplied, the relay coils 4a and 7a operate, and the contacts 4 and 7 are controlled to the positions shown in the figure. It has become. A relay coil 9a is connected to the solar cell 5, and electric power generated by the solar cell is supplied to the optical terminal device 13 and the charger 6
When power exceeds the power supplied to the
The signal for driving the relay contact 9 is output, and the relay contact 9 is controlled to the position shown in the figure.

The solar cell 5, the charger 6, the battery 8, the inverter 10, the relay 7, and the relay 9 constitute a self-generated power supply. The watt-hour meter 2, the watt-hour meter 3, and the relay 4 constitute a commercial power supply unit.

In the device configured as described above, when the amount of power generated by the solar cell 5 is sufficient in the daytime, the solar cell 5 drives the relay coil 9a and controls the contact 9 to the position shown in the figure. When the power is not interrupted, the relay coils 4a and 7a are driven by the commercial power, so that the relay contacts 4 and 7 are controlled to the positions shown in FIG. Therefore, the electric power generated by the solar cell 5 charges the battery 8 by the charger 6 and is supplied to the inverter 10 where an AC power is generated. Inverter 10
Is supplied to the optical terminal device 13, and the surplus power that cannot be used there is sent to the commercial power side via the watt meters 3 and 2, and the surplus power is sold to the power company. Is done. At this time, the amount of power sold is measured by the watt-hour meter 3, and the power information is transmitted to the transmission line 14 via the optical terminal device 13.

The inverter 10 takes in information of the commercial power, and always generates AC power synchronized with the commercial power. Further, the relay coil 11a does not operate at the normal voltage supplied normally, but operates when the voltage supplied thereto becomes abnormally high. At that time, the contact 11 is opened to protect the optical terminal device 13. It has become.

[0013] Even in the daytime, when the sunshine is small due to cloudy weather or rainy weather and the amount of power generated by the solar cell 5 is reduced, only the power supplied to the charger 6 can be generated with the generated power. At this time, the solar cell 5 detects this and does not drive the relay coil 9a.
Is in the position opposite to the figure, that is, in the open state, and the solar cell 5
Performs only charging of the battery 8. At this time, the optical terminal device 13
Is supplied with the commercial power 1, the amount of power at this time is measured by the watt hour meter 2, and the power information is transmitted to the transmission line 14 via the optical terminal device 13. It should be noted that this state is the same at night, but at that time, since the power is not generated by the solar cell 5, the battery 8 is not charged.

During a power failure, the commercial power 1 is not supplied, so that the relay coils 4a and 7a are not driven,
The relay contacts 4 and 7 are controlled to the opposite sides as shown. For this reason, the inverter 10 converts the electric power supplied from the battery 8 into an alternating current and supplies the alternating current to the optical terminal device 13. At this time, since the relay contact 4 is in the open state, the electric power from the battery 8 is supplied only to the optical terminal device 13. FIG. 2 divides the above-mentioned operation states into daytime and nighttime, further divides each power state, and summarizes the operation state of each relay.

[0015]

As described above, according to the present invention, in the daytime, solar power is generated, the power is supplied to the apparatus by converting the power into AC, the backup battery is charged, and the surplus power is supplied to the power company. It sells and uses commercial power at night. Further, at the time of nighttime power failure or daytime power failure when solar power cannot be generated, the battery is operated by the power of the charged battery. Further, instead of separately providing a transmission line for power transmission, an existing optical terminal and an optical transmission line connected thereto are used. For this reason, it is not necessary to rely on commercial power for backup power, and economic efficiency is improved, and by contributing to society by selling surplus power generated by solar power generation to a power company. Furthermore, instead of separately providing a transmission line and a communication device for meter reading, the above can be realized only by using an existing communication device and a transmission line and devising a power supply to be supplied thereto. In addition, there is an effect that the economical efficiency of the entire apparatus is improved because the configuration is simple.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of one embodiment of the present invention.

FIG. 2 is a diagram showing an operation state of each relay in the device of FIG.

FIG. 3 is a block diagram illustrating an example of a conventional device.

[Explanation of symbols]

1: commercial power, 2, 3: watt hour meter, 4, 7, 9, 11 ...
Relay, 5 ... solar cell, 6 ... charger, 8 ... battery, 10 ...
Inverter, 13 optical terminal, 14 transmission line, 15 telephone.

Claims (1)

(57) [Claims] 1. A power supply system for an optical terminal device for supplying power to an optical terminal device that performs communication via an optical transmission line, wherein power generated by a solar cell is supplied to the optical terminal device during the daytime and the battery is used. Charging and sending out surplus power to the commercial power side, a private power supply unit that supplies the battery power to the optical terminal device during a power failure, and commercial power that supplies commercial power when power cannot be supplied from the private power unit and a supply unit, provided from electric energy and the commercial power side sent out to the commercial power side
Sends the supplied electric energy to the transmission line via the optical terminal device
A power supply system for an optical terminal device.