JPS598499A - Remote supervisory and control system - Google Patents

Abstract

PURPOSE:To supply efficiently power, by supplying a charging power to a slave station device with charging voltage decrease information of a power capacitor. CONSTITUTION:A 2-wire transmission line 30 is used in common for the supply of AC power and the transmission of a remote signal, and n-sets (40-1-40-n) of slave devices are connected. When a charging voltage of a capacitor C1 of the slave station device 40-1 is dropped to a specified voltage or below, a power supply voltage detecting circuit 43 inputs a voltage decrease signal 48 to a slave station signal processing circuit 41. Then, the processing circuit 41 adds the voltage decrease information to a remote signal SV and transmits the result to a master station device 20 via the transmission line 30. When the master station device 20 detects this voltage decrease information, the AC power is applied to a rectifying and smoothing circuit 42 of the slave station device via the transmission line 30. The capacitor C1 is charged with this output. Thus, the power is supplied efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote monitoring and control system, and in particular to a remote monitoring and controlling system in which the power required is 1 to 1 via a transmission path. The present invention relates to a remote monitoring and control system supplied from a (hereinafter referred to as "master station device").

Uninterruptible N press as a power source for remote monitoring and control systems.

Although commercial AC power supply or batteries are used,
With the reduction in power consumption of devices due to advances in integrated circuit technology, a power supply system has been proposed in which the power required for a slave station device is supplied from a master station device via a signal transmission path. However, in conventional power supply systems of this type, power is supplied each time before all remote monitoring control signals (hereinafter referred to as remote signals) are transmitted from the master station device to the slave station device, or power is supplied leniently or for a specified period of time. It is necessary to fully supply power every time a period of time elapses, and the transmission line is occupied with power supply for a large amount of time, so the use of the transmission line for remote signals is inefficient, and power is transmitted even when it is unnecessary. It is an object of the present invention to provide a remote monitoring and control system that can efficiently supply power by reducing the total time during which a transmission line is connected by power supply.

The configuration of the present invention is such that a remote monitoring and control device and a monitored and controlled device are connected via a transmission path, the monitored and controlled device is provided with means for accumulating required power, and the power is supplied to the remote monitoring and control device. In a remote monitoring control system in which power is supplied from the transmission line to the power storage means, when the output voltage of the power storage means becomes equal to or less than a predetermined threshold, the monitored controlled device transmits the voltage drop information to the power storage means. transmitting the power through a transmission line to the remote monitoring and control device, and the remote monitoring and control device supplies the power when receiving the voltage drop information.
It is expressed as a percentage.

The present invention will now be described in detail with reference to all the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In this embodiment, the two-wire transmission line 30 is shared for supplying AC power and transmitting remote signals, and there are n slave station devices 40 (40
-1 to 40-n') are connected. However, in order to avoid complication of the drawing, only one slave station device (40-1) is shown. Figure 2 shows the power P supplied to the two-wire transmission line.
It is a time chart showing the relationship between WR, remote signal C0NT, and SV.

First, a description will be given of power supply when the charging voltage of the large-capacity capacitor C1 of the slave station device 40-1 has fallen below a specified voltage when the remote signal C0NT is received.

One end of the relay contact rtl of the master station unit [20] is connected to the AC power supply 10
It is connected to the. The master station signal processing circuit 21 sends a power transmission signal 22 t: to the relay RLI when the relay contact rL1f is closed, and since the relay contact rL2 is initially connected to the a side, the flowing power is transferred to the relay contact rt1゜relay contact rz2
and is supplied to the slave station device 40-1 via all two-wire transmission lines 30. Although the current power is also applied to the terminal 25, the main station signal processing circuit 21 uses a built-in filter to suppress the influence of the current power, so the AC power does not interfere with the operation. Relay contact rL3-2 of slave station device 40-1
is initially connected to the C side, so the nine AC power supplied to the slave station device 40-1 is supplied to the rectifying and smoothing circuit 42 via the relay contact rt3-2tl- (the power applied to the terminal 49 The AC power, like the AC power applied to the terminal 25, does not affect the slave station signal processing circuit 41). The rectifying and smoothing circuit 42 rectifies and smoothes AC power, converts it into DC power, charges a large-capacity capacitor C1, and stores the power. The power supply voltage detection circuit 43 monitors the charging voltage of the capacitor C1, and when it exceeds a specified voltage, inputs a latch relay drive signal 47 to the latch relay RL3, closes the relay contact rL3-1, and transfers the charging power of the capacitor C1 to the slave station. The signal is supplied to the signal processing circuit 41, and the relay contact rt3-2td is connected to the switching slave station [40-1] in preparation for the transmission operation.

When a predetermined time has elapsed, the master station signal processing circuit 21 turns off the power transmission signal 22, opens the relay contact rL"i', and stops supplying AC power to the slave station device 40-1. Master station signal processing The circuit 21 sends a switching signal 23 to the relay RL2,
Switch relay contact rLZ to b side. Following this, the master station signal processing circuit 21 outputs the remote signal C0NT' to the output terminal 24.
The signal is output from the relay contact rL2 and transmitted to the slave station device 40-1 via the two-wire transmission line 30.

When the slave station signal processing circuit 41 receives the remote signal at the C0NTk terminal 49, the charging voltage of the capacitor C1 is normally higher than the specified voltage, so the power supply voltage detection circuit 43 does not output the voltage drop signal 48. After receiving the remote signal C0NT, the slave station device 40-1 performs all of the predetermined signal processing and receives the remote signal S.
v to the master station device 20. Note that the slave station device 40
The details of the transmission operation will be described later.

Next, the master station device 20 moves to the next slave station device 4 according to the procedure described above.
0-2, the remote signals C0NT and SV are completely transmitted and received, and the same operation is repeated with the subsequent slave station devices 40 as well.

Slave station device 4Q-i (1(i<n)
remote signal SVt is received, and the next slave station device 4O-(i+1
) will be described below.

When the charging voltage of the capacitor C1 in the slave station device 4O-(i+1) drops below a specified voltage, the healthy voltage detection circuit 43 inputs a voltage drop signal 48 to the gold station signal processing circuit 41. The slave station signal processing circuit 41 receives the remote signal C0.
When the receiving board power supply voltage drop signal 48 of the NT is input, information on the power supply voltage drop is added to all remote signals Sv. This remote signal SV is connected to terminal 50. Relay contact rt3-2. The signal is transmitted to the master station device 20 via the two-wire transmission line 30.

After the transmission of the remote signal SV is completed, the slave station signal processing circuit 41 inputs the transmission end signal 52 to the latch IJ L/-Rb2, switches it to the relay contact rL3-2'kcψ11, and closes the contact r
t3-1i to prepare for power supply from the master station device 20. The master station signal processing circuit 21 transmits the remote signal Sv to the terminal 25.
At this time, all the information about the power supply voltage drop is detected in the remote signal SV, and the relay contact rt2 is switched to the a side for a predetermined period of time, and the relay contact rztt is closed, and the AC power is completely 2-wire system. slave station device 4 via the transmission line 30 of
0- (G1-.). After this power supply ends, the master station device 20 stops transmitting signals.
Transmission and reception of remote signals C0NT and SV are resumed with O-(i+2).

As another uninvented embodiment, the slave station device receives the remote signal C0NT.
A method in which if the charging voltage drops below the specified voltage even if there is no charge, information about the power supply voltage drop is sent to the master station device, which detects the information and fully supplies power to the slave station devices. There is. In addition, in the embodiment shown in Fig. 1, we have explained the case where a current power supply is used and the transmission line is a two-wire type, but we will also explain the case where the supply power is a DC power supply and the transmission line is a four-wire type. The present invention is also applicable.

As explained above, in a remote monitoring control method using a power accumulator such as a large-capacity capacitor as a total power source, charging power is supplied to a slave station device based on information that the charging voltage of the power accumulator has decreased. Since unnecessary power is not supplied, power can be used economically and efficiently.Also, the time that the transmission line is occupied by 11 sources is reduced, and the exclusive time of the remote signal is increased, allowing for remote monitoring of all slave stations. This has the effect of shortening the time required to complete the control operation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a time chart of electric power PWR, remote signals C0NT and SV supplied to the two-wire transmission line of this embodiment. 10... AC power supply, 20... Master station device, 21... Master station signal processing circuit, 30...
Two-wire transmission line, 40-1...Slave station device, 41
...Slave station signal processing circuit, 42 ... Rectification and smoothing circuit, 43 ... Power supply voltage detection circuit, RLI ...
...Relay for power transmission, Rb2... Relay for power transmission/transmission switching, Rb2... Latch relay used for both power supply and power reception/transmission switching, cl... Large capacity capacitor for power storage, PWR...Power supplied from the master station device to the slave station device, C0NT...Small remote signal transmitted from the master station device to the slave station device, Sv...
...Remote signal sent from slave station device to master station device. Agent Patent Attorney Susumu Uchihara 11'l I'e'l -- Homare-/rxl

Claims (1)

[Claims] A remote monitoring and control device and a monitored and controlled device are connected through a transmission line, and the monitored and controlled device is provided with a means for accumulating necessary power, and the power is transmitted from the remote monitoring and control device via the transmission path. In the remote monitoring control system, when the output voltage of the power storage means becomes equal to or less than a predetermined threshold value, the monitored control device transmits the voltage drop information to the power storage means via the transmission path. A remote monitoring and control system, characterized in that the remote monitoring and controlling device supplies the electric power when receiving the voltage drop information.