JPH08163793A - Power supply system for optical terminal device - Google Patents

Abstract

PURPOSE: To improve economical efficiency by a method wherein solar power generation is conducted in the daytime, power from the solar power generation is converted into an AC and an optical terminal device is supplied with the AC while cells for a back-up are charged, dump power is sold to an electric power company, commercial power is used in the nighttime and the cells for the back-up are employed at the time of service interruption or the time of the nonuse of solar cells. CONSTITUTION: Power generated by solar cells 5 charges cells 8 for a back-up in the daytime while an inverter 10 is supplied with the power, thus generating an AC power supply. An optical terminal device 13 is supplied with the AC power supply while dump power is forwarded to the commercial power 1 side through watthour meters 3, 3, and sold to an electric power company. Commercial power 1 is used in the nighttime, and the power of the previously charged cells 8 for the back-up is employed at the time of service interruption or when solarlight power generation is not performed as in the cloudy weather and rainy weather even in the daytime. Accordingly, the economic efficiency can be improvied.

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 measure against commercial power failure and solar energy.

[0002]

2. Description of the Related Art As shown in FIG. 3, the power supply of a conventional optical terminal device is supplied with commercial power 1, and a switching circuit 16 is provided.
A DC voltage is obtained by the rectifier circuit 18 via one of the secondary windings of the transformer 17 and the DC voltage, and the DC voltage is supplied to the load 23.
It is fed back to 6 and stabilized. At the same time, the other side of the secondary winding of the transformer 17 charges the battery 8 via the rectifier circuit 19 and the charger 6, and further supplies power from the battery 8 to the load 23 via the stabilizing circuit 20 and the diode 21. There is.

Here, the output voltage of the rectifying circuit 18 is V1,
When the output voltage of the stabilizing circuit 20 is V2 and the voltage drop of the diode 21 is Vf, the relationship of V1> V2-Vf is established. Therefore, if the rectifier circuit output voltage is the same, in a so-called normal state in which commercial power is supplied, power is supplied to the load 23 from the rectifier circuit 18 side having a higher voltage than the stabilizing circuit 20 side. . In a state in which commercial power is not supplied, that is, in a power failure state, the load 8 is automatically and without interruption from the battery 8 via the stabilizing circuit 20 and the diode 21.
Power is supplied to 3. This allows the telephone 15 to ring even if the commercial power fails.

However, in this method, the backup function occupies a large volume in the device volume, and the cost of that portion also occupies a considerable part. However, although this backup function is not normally used, power is supplied from commercial power. In the normal state, the power consumed by the backup section was wasted. On the other hand, in terms of power supply due to the increase in power demand due to the increase in these electronic devices, costs such as securing a site are high, and the power supply cannot keep up,
In optical terminal devices, which are expected to increase rapidly in the future,
There is an urgent need for uninterruptible power consumption and power saving. Under these circumstances, the sale of surplus power due to reverse power flow was approved from 1994, and solar power generation is drawing attention. For example, JP-A-61-254029 and JP-A-6-254029.
Japanese Patent Laid-Open No. 2-20714 proposes to sell the surplus power generated by private power generation to an electric power company.
Japanese Patent Laid-Open No. 57894 and Japanese Patent Laid-Open No. 56-53467 disclose a meter reading method for electric energy.

[0005]

However, in such a method, it is necessary to prepare a transmission line and a communication device for transmitting the result of meter reading, and in reality, such equipment is arranged only for meter reading. Doing so has a problem that it is not profitable and difficult to realize. The present invention has been made in view of such a situation, and it is possible to manage the amount of electric power generated by a user and the amount of electric power purchased, with high profitability.

[0006]

In order to solve such a problem, the present invention supplies electric power generated by a solar battery to an optical terminal device during the daytime, and charges surplus power to commercial power while charging the battery. And a commercial power supply unit that supplies the battery power to the optical terminal device at the time of power failure and a commercial power supply when the power cannot be supplied from the private power generation unit. . Further, the amount of power sent to the commercial power side and the amount of power supplied from the commercial power side are sent to the transmission path via the optical terminal device.

[0007]

In the daytime, solar power is generated, which is used as an alternating current to supply power to the device, a backup battery is charged, surplus power is sold to a power company, and commercial power is used at night. In addition, it operates with the power of the charged battery during a power failure at night or during a power failure during the day when solar power cannot be generated.

[0008]

1 is a block diagram showing an embodiment of the present invention. Commercial power 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 via. On the other hand, the output of the solar cell 5 is supplied to the battery 8 through the A contact (normally closed contact) of the charger 6 and 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 the connection portion of the contacts of the relay 4 and the relay 11 via the normally closed contact of the relay 9 and the inverter 10. Relay 7
The B contact (operating contact) is connected to the input side of the inverter 10.

To the optical terminal device 13, a telephone 15 is connected, power information from the watt-hour meters 2 and 3 is supplied, and the power information is sent to the transmission line 14. A relay coil 4a and a relay coil 7a are connected to the commercial power 1 side, and when commercial power is supplied, the relay coils 4a and 7a operate to control the contacts 4 and 7 to the positions shown in the figure. It is like this. A relay coil 9a is connected to the solar cell 5, and the electric power generated by the solar cell is supplied to the optical terminal device 13 and the charger 6.
When the power supplied to the
A signal for driving a 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 privately-generated power supply section. Further, the watt-hour meter 2 and the watt-hour meter 3 and the relay 4 constitute a commercial power supply unit.

In the device constructed as described above, when the amount of power generated by the solar cell 5 is sufficient during the daytime, the solar cell 5 drives the relay coil 9a to control the contact 9 to the position shown in the figure. Further, since the relay coils 4a and 7a are driven by the commercial power when there is no power failure, the relay contacts 4 and 7 are controlled to the positions shown in the figure. 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 the AC power is generated. Inverter 10
The alternating-current power generated in 1 is supplied to the optical terminal device 13, and the surplus power that cannot be used up there is sent to the commercial power side through the watt-hour meters 3 and 2, and the surplus power is sold to the power company. To be done. The amount of electric power sold at this time is measured by the electric energy meter 3, and the electric power information is sent to the transmission line 14 via the optical terminal device 13.

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

Even during the daytime, when there is little sunshine due to cloudy weather or rainy weather and the amount of power generated by the solar cell 5 is small, only the power supplied to the charger 6 can be generated from the generated power. At this time, the solar cell 5 detects it 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
Only charges the battery 8. At this time, the optical terminal device 13
Is supplied with commercial power 1, the amount of power at this time is measured by the watt hour meter 2, and the power information is sent to the transmission path 14 via the optical terminal device 13. It should be noted that, even at night, this state is the same, but at that time, since the solar cell 5 does not generate power, the battery 8 is not charged.

Since the commercial power 1 is not supplied at the time of power failure, the relay coils 4a and 7a are not driven,
The relay contacts 4 and 7 are controlled on the opposite side of the figure. Therefore, the inverter 10 converts the electric power supplied from the battery 8 into 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 power from the battery 8 is supplied only to the optical terminal device 13. FIG. 2 shows the operation state of each relay by dividing the above operation state into daytime and nighttime and further into each power state.

[0015]

As described above, according to the present invention, solar power is generated in the daytime, and the power is supplied to the device by converting the power into an alternating current to supply power to the device. It is sold and uses commercial power at night. In addition, during a power failure at night or during a power failure during the daytime when solar power generation cannot be performed, the power of the charged battery is used for operation. Further, instead of separately providing a transmission line for power transmission, an existing optical terminal and an optical transmission line connected to it are used. Therefore, there is no need to rely on commercial power for backup power, which improves economic efficiency and also contributes to society by selling surplus power generated by solar power generation to a power company. In addition, instead of installing a separate transmission line and communication device for meter reading, using the existing communication device and transmission line, simply by devising the power supply to that, the above could be achieved. Since the structure is simple, there is an effect that the economical efficiency of the entire apparatus is improved.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an operating state of each relay in the apparatus of FIG.

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

[Explanation of symbols]

1 ... Commercial power, 2, 3 ... Electricity meter, 4, 7, 9, 11 ...
Relay, 5 ... Solar cell, 6 ... Charger, 8 ... Battery, 10 ...
Inverter, 13 ... Optical terminal, 14 ... Transmission line, 15 ... Telephone.

Claims (3)

[Claims] 1. A power supply system for an optical terminal device, which supplies power to an optical terminal device communicating through an optical transmission line, comprising: supplying power generated by a solar cell to the optical terminal device during the daytime; A commercial power supply that charges and outputs surplus power to the commercial power side, and supplies the battery power to the optical terminal device during a power failure, and commercial power that supplies commercial power when the power cannot be supplied from the private power generation unit. A power supply system for an optical terminal device, comprising: a supply unit. 2. The optical terminal device according to claim 1, wherein the amount of electric power sent to the commercial power side and the amount of electric power supplied from the commercial power side are sent to the transmission line via the optical terminal device. Power system. 3. The power supply system for an optical terminal device according to claim 1, wherein the power supply is shut off when the voltage supplied to the optical terminal device is higher than a specified value.