JPS6146654A - Power supply interruption remote detector - Google Patents

Abstract

PURPOSE:To inform surely power supply interruption of a remote station to a master station by providing a sub-power supply circuit operated at the interruption of a main power circuit, supplying an operating power from the sub power supply circuit to a power interruption signal generating means at power interruption and transmitting the power interruption signal to the master station. CONSTITUTION:A remote station 1 supplies power from the sub power supply circuit 3 to a pattern generator 13 only for a prescribed time. The pattern generator 13 generates a power supply interruption signal, which is transmitted to the master station 9 through a transmission circuit 7 and detected by a pattern detection circuit 14. Thus, the master station knows the power interruption of the remote station.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a remote power failure detection device for detecting a power failure in a remotely installed communication device installed at a remote location from a master station.

Prior Art Conventional power failure remote detection devices detect when the power input to a remotely installed communication device is cut off by grounding or opening the communication line connecting the remotely installed communication device and the station installed communication device.
It is configured to notify the station-installed communication device side of power input interruption by fixing the signal level on the communication line to a high level or low level, or by changing the impedance of the communication line. However, the above-described conventional configuration has a drawback in that the master station cannot distinguish a disconnection of power input to a remotely installed communication device from a disconnection or short-circuit failure of the eight communication lines. In addition, if the communication line is made of a medium that does not conduct electrical signals, such as an optical fiber, it is necessary to use an intervening core wire etc. to notify the power outage, and it is not possible to use the communication line itself. The disadvantage is that it cannot notify you of a power outage.

OBJECTS OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional drawbacks, to notify the master station of power input interruption using the communication line itself, and to enable the master station to distinguish between power input interruption and communication line failure. An object of the present invention is to provide a remote power-off detection device capable of separately detecting power-off.

Structure of the Invention The remote power failure detection device of the present invention includes a main circuit of a remotely installed communication device, a transmitting circuit that sends an output signal of the main circuit of the remotely installed communication device to a station installed communication device via a communication line, and a power supply input. a main power supply circuit for supplying the power to the main circuit and the transmission circuit of the remotely installed communication device; and a power supply disconnection signal generator for generating a power supply disconnection signal to indicate power input disconnection and transmitting the generated power supply disconnection signal to the communication line via the transmission circuit. and a sub-power supply circuit for supplying operating power to the power-off signal generating circuit and the transmitting circuit for a predetermined period of time or more when the power supply is cut off, the sub-power supply circuit generating the power-off signal when the power supply is cut off. supplying operating power to the means and a transmitting circuit, causing the power-off signal generated by the power-off signal generating means to be sent to a communication line via the transmitting circuit, and detecting the power-off signal on the station-installed communication device side. Accordingly, it is possible to determine whether power input to the remotely installed communication device has been interrupted.

Embodiments of the Invention Next, the present invention will be described in detail with reference to the drawings.

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

That is, the remotely installed communication device 1 and the station installed communication device 9 are connected by the communication line 8, and the remotely installed communication device 1 is connected to the remotely installed communication device main circuit 6 and the remotely installed communication device main circuit 6.
a transmitting circuit 7 that converts the output signal of the 1 to a line signal and sends it to the station installed communication @ device 9; main power supply circuit 4, a pattern generation circuit 13 that generates a power-off signal of a predetermined specific pattern as a signal indicating a power-off, and a pattern generation circuit 13 and a transmission circuit 7 that operate for a certain period of time or more when the power is cut off. and a sub power supply circuit 3 for supplying power. The station-installed communication device 9 performs communication by inputting a received signal input via the receiving circuit IO to the station-installed communication device main circuit ll. The pattern detection circuit 14 constantly monitors the output of the receiving circuit 10, and detects that the power input to the remotely installed communication device 1 is cut off by detecting the specific pattern.

That is, in the remotely installed communication device 1, when the power is cut off, the sub power supply circuit 3 supplies operating power to the pattern generation circuit 13 and the transmission circuit 7, and the pattern generation circuit 13 generates a power cutoff signal of a specific pattern. The signal is sent to the transmission line via the transmission circuit 7. This signal does not require frame synchronization or the like, and it is sufficient to simply convert the output of the pattern generation circuit 13 into a signal suitable for transmission (for example, an optical signal) and send it to the communication line 8. On the station installed communication device 9 side, a pattern detection circuit 14
By detecting the power-off signal of the specific pattern, it is determined that the power input to the remotely installed communication device l has been cut off. Therefore, unlike the conventional case, disconnection or short circuit of the communication line 8 will not be erroneously determined to be a power outage. Also, since the communication line itself is used to transmit the power-off signal,
There is no need to use another intervening core 1a or the like.

FIG. 2 shows the main power supply circuit 4 and the sub power supply circuit 3 of this embodiment.
FIG. That is, power input terminal 1
5 is outputted to the main power line 5 through a diode 20 and a contact point of a relay B to be described later. In addition, relay A connected to power input terminal 15
The capacitor 21 is charged through the contact a1. The voltage charged in the capacitor 21 is output to the sub power line 12 via the normal contact a3 of the relay A. Further, contact a2 of relay A and relay B are connected in series to both ends of capacitor 21, and contact a2 of relay B is inserted in series to the output circuit of main power supply circuit 4 as described above.

Next, the operation of this embodiment will be explained. When power is input to the power input terminal 15 in FIG. 2, the relay A operates, its contact a□ closes, and the capacitor 21 is charged.

Now, since the normal contact a3 of relay A is open, the voltage of capacitor 21 is not output to sub-power [12]. Therefore, a certain amount of charge is accumulated in the capacitor 21. When a certain amount of charge is accumulated in the capacitor 21, the relay B operates and closes its contacts, so that the power input terminal 1
The current input from 5 is output to the main power line 5 through the contacts, and operating power is supplied (to the remotely installed communication device main circuit 6 and transmission circuit 7 in FIG. 1) to start communication. If the power input is cut off during communication, relay A is restored, contacts a1 and a2 are opened, and relay B is also restored. At this time, the diode 20 prevents the charge in the capacitor 21 from flowing back to the relay A. Then, when the normal contact a3 of relay A closes, the charge accumulated in the capacitor 21 is outputted to the sub power line 12. As a result, the pattern generating circuit 13 generates the specific pattern and inputs it to the transmitting circuit 7, which converts it into a signal (for example, an optical signal) to be transmitted over the communication line 8 and sends it to the communication line 8. The charge accumulated in the capacitor 21 disappears after a certain period of time, and the pattern generation circuit 13 and the transmission circuit 7 stop operating, but during that time, the output of the reception circuit 10 is monitored by the pattern detection circuit 14 on the station-installed communication device 9 side. The device detects the signal of the above-mentioned specific pattern and determines that the power supply is disconnected.

In this embodiment, power can be quickly supplied to the sub power line 12 in the event of a power input interruption, and the communication line 8 is a line that does not directly conduct electrical signals (for example, an optical fiber). Even in this case, there is an effect that the main station can be reliably notified of power input interruption via the communication line 8. In addition, disconnection or short-circuit failure of the communication line 8 will not be erroneously determined as power input disconnection. In addition, since main power supply is not started until charge is accumulated in the sub power supply circuit 3, it is possible to reliably notify the master station of power input interruption during or after one communication.

Instead of the pattern generation circuit 13, when the power is turned off, the logic "LH" is simply generated and inputted to the transmitting circuit 7, and the transmitting circuit 7 generates the logic "1" at a specific bit position of the frame signal.
” signal and sends it to the communication line 8, and the station-installed communication device 9 may detect a power input interruption by monitoring specific bits of the frame signal output from the receiving circuit IO. It is possible.

Furthermore, if a battery is used in the sub power supply circuit 3, the pattern generation circuit 13. It goes without saying that power for operating the pattern detection circuit 14 and the like can be supplied.

Effects of the Invention As described above, in the present invention, when the power input to the remotely installed communication device side is cut off, a power input cutoff signal is generated by the auxiliary power supply and sent to the communication line, and this is detected by the station installed communication device side. Since the configuration is configured to determine that power input has been interrupted by This has the effect of reducing maintenance operations.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a circuit diagram showing details of the main power supply circuit and sub-type 11A circuit of the above embodiment. In the figure, ■ = remotely installed communication device, 2: power supply line, 3:
Sub power supply circuit, 4: Main power supply circuit, 5: Main power line, 6: Remote installation communication device main circuit, 7: Transmission circuit, 8: Communication line, 9:
Station installed communication device, 10: Receiving circuit, 11: Station installed communication device main circuit, I2: Sub power line, 13: Pattern generation circuit, 1
4: Pattern detection circuit, 15: Power input terminal, 20: Diode, 21: Capacitor.

Claims (4)

[Claims] (1) A main circuit of a remotely installed communication device, a transmitting circuit that sends an output signal of the main circuit of the remotely installed communication device to the station installed communication device via a communication line, and a transmitting circuit that transmits power input to the main circuit of the remotely installed communication device. a main power supply circuit for supplying power to the circuit; a power-off signal generation circuit that generates a power-off signal to indicate a power-off signal and sends it to the communication line via the transmission circuit; A sub-power supply circuit for supplying operating power to a power-off signal generation circuit and a transmitting circuit, the sub-power supply circuit supplying operating power to the power-off signal generating means and transmitting circuit when power input is interrupted. The power-off signal generated by the power-off signal generating means is transmitted to the communication line via the transmission circuit, and the station-installed communication device side detects the power-off signal, thereby inputting power to the remotely installed communication device. A power outage remote detection device characterized by being capable of determining a power outage. (2) In the power-off remote detection device according to claim 1, the power-off signal generating means is constituted by a pattern generating circuit that generates a specific pattern signal by supplying power from the sub power supply circuit. Something that is characterized by being done. (3) In the power-off remote detection device according to claim 1, the transmitting circuit transmits the power-off signal inputted from the power-off signal generating means by placing it on a specific bit position of a transmission frame. something that is characterized by (4) In the power disconnection remote detection device according to claim 1, 2, or 3, the sub power supply circuit includes a capacitor charged by direct current supplied from the main power supply circuit. , a charging detection means for detecting the completion of charging of the capacitor, and the main power supply circuit supplies operating power to the main circuit of the remotely installed communication device and the transmission circuit through a contact that is closed by the output of the charging detection means. something that is characterized by