JPH01255450A - Remote display device - Google Patents

Abstract

PURPOSE:To monitor and display ON/OFF and alarm state of an electric device by two wires by employing a current flowing in one direction and an intermittent current flowing in one direction. CONSTITUTION:When an ON state switch 15 is closed at an electric device side, an ON signal (a) is fed to a monitor display circuit 5A of monitor side through wires 21 and 22. Accordingly, a red light emitting diode 18 is fired by the signal (a) at the monitor side. When an intermittent switching circuit 17 is operated at the electric device side, the switch 15 is intermittently turned ON, OFF (at each 0.5sec.) by the circuit 17. Then, an alarm signal (c) is fed to the circuit 5A of the monitor side through the wires 21, 22. Accordingly, the diode 18 is intermittently fired by the signal (c), further detected by an intermittent current detector 20, a contact switch 10 is closed to ring a buzzer.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a remote display device that monitors and displays the on/off and alarm status of electrical equipment located at a remote location such as in a high-rise building. This invention relates to a remote display device that can monitor and display the on/off and alarm states of electrical equipment using two electric wires.

[Prior Art] FIG. 5 is a circuit diagram showing a conventional remote display device. In Fig. 5, (1) is a transmitting circuit installed in electrical equipment located in a remote location such as in a high-rise building, and 5l-82
, S5, S4, (2), (3) and (4).

Sl, S2, S, and S4 are transmitting terminals, (2), (3
) and (4) are on-state switches, off-state switches, and alarm state switches connected between the transmission terminal St and the transmission terminals S2, S, and S4.

(5) is a monitoring display circuit installed at a monitoring location; T1. T2, T1, T4, (6), (7),
It consists of (8), (9) and (10).

T1, T2, T, and T are receiving terminals, (6), (7
) and (8) are on-state display lamps, off-state display lamps, and alarm state display lamps connected between reception terminal T1 and reception terminals T2, T3, and T4; (9)
1 is a relay circuit connected in parallel to this alarm status display lamp (8), and 10 is a contact switch provided near this relay circuit (9).

(11), (12), (13) and (14) are transmitting terminals S1, S2, S, and S and receiving terminals T1, T7.
, T3 and T. Note that the AC power source E is inserted between the transmitting terminal S1 and the receiving terminal T.

Next, the operation of the above-mentioned conventional example will be explained. First, when the on-state switch (2) is turned on on the electrical equipment side, current flows through the electric wires (11) and (12) to the monitoring display circuit (5) on the monitoring side. Therefore, on the monitoring side, the on-state indicator lamp (6) is lit by this current.

Similarly, on the electrical equipment side, the off-state switch (3)
When turned on, current flows through the electric wires (11) and (13) to the monitoring display circuit (5) on the monitoring side.

Therefore, on the monitoring side, the off-state indicator lamp (7) is lit by this current.

In addition, on the electrical equipment side, an alarm status switch (4
) is turned on, current flows through the electric wires (11) and (14) to the monitoring display circuit (5) on the monitoring side.

Therefore, on the monitoring side, the alarm status display lamp (8
) is lit by this current, and the relay circuit (
9) is driven by this current, and the contact switch (10
) on. As a result, a buzzer (not shown) sounds.

In this way, the ON, OFF, and alarm states of electrical equipment located at remote locations can be detected in the monitoring and display circuit (5) by the lighting of the ON state indicator lamp (6) and the lighting of the OFF state indicator lamp (7).
), the alarm status display lamp (8) lights up, and the buzzer sounds to enable monitoring.

[Problem to be Solved by the Invention] The conventional remote display device as described above has a problem in that at least four electric wires are required to monitor and display the on/off and alarm status of one electrical device. was there.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a remote display device that can monitor and display the on/off status and alarm status of electrical equipment using two electric wires.

[Means for Solving the Problems] A remote display device according to the present invention includes a transmitting means that includes a unidirectional current generating means that generates a current flowing in one direction and an intermittent current generating means that interrupts the current flowing in the one direction. ,
It consists of a unidirectional current detecting means for detecting the current flowing in one direction and an intermittent current detecting means for detecting the intermittent current flowing in the one direction, and a receiving means located at a location away from the transmitting means, and a receiving means for these transmitting means and the receiving means. It is equipped with two connecting means for connecting the means.

[Function] In this invention, the two connecting means
Signals of on, off and alarm states of the means (electrical equipment) are transmitted to the receiving means (monitoring and display circuit), and these states are detected and displayed by the receiving means.

[Embodiment] FIG. 1 is a circuit diagram showing a partial block diagram of an embodiment of the present invention, and (10) is substantially the same as the conventional device described above.

In FIG. 1, (l^) is a transmitting means consisting of a unidirectional current generating means and an intermittent current generating means. The circuit is Sl, S, , Dl, D2, (
15), (16) and (17).

S and S6 are transmission terminals, and the unidirectional current generating means is composed of Dl, D2, (15) and 16),
The intermittent current generating means consists of (17).

Dl is a diode whose anode terminal is connected to the transmission terminal S, D2 is a diode whose cathode terminal is connected to the transmission terminal S5, and (15) is connected between the cathode terminal of the diode D1 and the transmission terminal S. on-state switch,
<16) is the anode terminal of diode D2 and the transmission terminal S
, which is an off-state switch connected between the two, and <17) is an intermittent switch ink circuit provided near the on-state switch (15).

5^) is a receiving means consisting of a unidirectional current detecting means and an intermittent current detecting means, and in this embodiment, it is a monitoring display circuit provided at a monitoring place, and T5, T6, R1
, (18), (19), (20) and (10).

T and T6 are receiving terminals, the one-way current detection means is composed of R1, (18) and (19), and the intermittent current detection means is composed of (20).

R1 is a resistor whose other end is connected to the receiving terminal T6, (18)
(19) is a red light emitting diode whose cathode terminal is connected to the receiving terminal T, and whose anode terminal is connected to one end of the resistor R1, and (19) is a red light emitting diode whose anode terminal is connected to the receiving terminal T, and whose cathode terminal is connected to one end of the resistor R1. A green light emitting diode (20) connected to one end of is an intermittent current detection circuit connected between receiving terminals T5 and T6.

Reference numerals 21 and 22 are connecting means, which in this embodiment are electric wires connected between the transmitting terminal S and the receiving terminal T, and between the transmitting terminal S6 and the receiving terminal T6. Note that the AC power source E is inserted between the transmitting terminal S and the receiving terminal T.

FIG. 2 is a circuit diagram showing the intermittent T4 flow detection circuit (20) of FIG. 1 in detail. In FIG. 2, the intermittent current detection circuit (20) includes Dl, R2, C1, C2, Tr+, (
23), (24) and (25).

(23) has one input terminal connected to the receiving terminal T,
and the other input terminal is a full-wave rectifier circuit connected to the receiving terminal T, D is a diode whose anode terminal is connected to one output terminal of the full-wave rectifier circuit (23), and R2 is a full-wave rectifier circuit ( 23) A resistor connected to one output terminal of C
I is a capacitor whose one end is connected to the resistor R2 and whose other end is connected to the other output terminal of the full-wave rectifier circuit (23);
C2 is a capacitor whose one end is connected to the cathode terminal of the diode D, and whose other end is connected to the other output terminal of the full-wave rectifier circuit (23).

(24) is a voltage detection circuit connected to the connection point between resistor R2 and capacitor C1, and Tr has a base terminal connected to the voltage detection circuit (24) and an emitter terminal connected to the other side of the full-wave rectifier circuit (23). The transistor (25) is a relay circuit connected between the cathode terminal of the diode D and the collector terminal of the transistor Tr1.

Next, the operation of the above-mentioned embodiment will be explained in Fig. 3(a) and (1+).
This will be explained with reference to and (c). Figure 3(a),
(b) and (c) are signal waveform diagrams showing signal waveforms representing on, off, and alarm states of electrical equipment.

In Figure 3, the signal waveform in (a) is a positive ON signal obtained by half-wave rectification of alternating current, the signal waveform in (b) is a negative signal OFF signal obtained by half-wave rectification of alternating current, and (c) The signal waveform is an alarm signal in which the above-mentioned ON signal is intermittent, for example, every 0.5 seconds.

First, on the electrical equipment side, the on-state switch (15)
When turned on, an on signal as shown in No. 121(a) flows through the electric wires (21) and (22) to the monitoring display circuit (5^) on the monitoring side. Therefore, on the monitoring side, the red light emitting diode (18) is turned on by the on signal.

Similarly, on the electrical equipment side, the off-state switch <16
) is turned on, an off signal as shown in FIG. 3(b) flows through the electric wires (21) and (22) to the monitoring display circuit (5^) on the monitoring side. Therefore, on the monitoring side, the green light emitting diode (19) is turned on by the off signal.

In addition, on the electrical equipment side, an intermittent switching circuit (1
7) is operated, the on-state switch (15) is turned on intermittently (every 0.5 seconds) by a relay circuit (not shown) of the intermittent switching circuit (17). The alarm signal as shown in FIG. 3(e) is generated by the electric wire (21), (
22) and flows to the monitoring display circuit (5^) on the monitoring side. Therefore, on the monitoring side, a red light emitting diode (
18) is intermittently lit by an alarm signal.

Furthermore, on the monitoring side, the alarm signal is full-wave rectified by a full-wave rectifier circuit (23) to charge the capacitor C1. The voltage detection circuit (24) detects that the voltage V1 of the capacitor C4 falls below a predetermined voltage and outputs a control signal.

Here, the resistor R2 and the capacitor C1 constitute a Cfl integration circuit, and calculate the average voltage between the outputs of the full-wave rectifier circuit (23). Therefore, the average voltage of the alarm signal shown in FIG. 3(c) is lower than the average voltage of the ON and OFF signals shown in FIGS. 3(a) and (b).

The relay circuit (25) is driven by the capacitor C2 and turns on the contact switch (10) because the transistor Tr+ is made conductive by the above-mentioned control signal. Therefore, a buzzer (not shown) connected to the contact switch (10) sounds in response to the alarm signal.

In this way, the ON state, OFF state and alarm state of electrical equipment located at a remote location can be detected in the monitoring display circuit (5^) by the lighting of the red light emitting diode (18), the lighting of the green light emitting diode (19), and the red light emitting diode (19). Monitoring can be performed by intermittent lighting of the light emitting diode (18) and sounding of the buzzer.

FIG. 4 is a detailed circuit diagram of another intermittent current detection circuit (20^), in which R2, C1, C2, Trl, (23
), (24) and (25) are exactly the same as the above-mentioned intermittent current detection circuit (20).

In FIG. 4, the intermittent current detection circuit (20^) is constructed by removing the intermittent current detection circuit (20) and adding a new D4.
, R1 and Tr2 to form Dl, R2, R3, C
1, C2, Trl, Tr2, (23), (24) and (25).

D, the anode terminal is full wave! A diode is connected to one output terminal of the i-current circuit (23), R1 is a resistor connected to one output terminal of the full-wave rectifier circuit (23), and Tr2 has a base terminal connected to the resistor R1 and a collector terminal. is a transistor connected to the connection point between the resistor R2 and the capacitor C2, and whose emitter terminal is connected to the other output terminal of the full-wave rectifier circuit (23).

Note that one end of the resistor R2 and the capacitor C2 is connected to the cathode terminal of the diode D, and the relay circuit (25)
are the cathode terminal of the diode D and the transistor Tr,
is connected between the collector terminal of

Next, the operation of the above-mentioned intermittent current detection circuit (20^) will be explained with reference to FIGS. 3(a), (b) and (C).

The ON signal and OFF signal as shown in FIGS. 3(a) and 3(b) are full-wave rectified by a full-wave rectifier circuit (23) to charge the capacitor C1. However, the capacitor CI is discharged by the transistor Tr2 every cycle of the on signal and the off signal.

The alarm signal as shown in FIG. 3(c) is full-wave rectified by the full-wave rectifier circuit (23) and charges the capacitor C1. The capacitor C1 is no longer discharged by the transistor Tr2 at every intermittent interval (0.5 seconds) of the alarm signal. Therefore, the voltage detection circuit (24) detects that the voltage V2 of the capacitor C1 rises above a predetermined voltage and outputs a control signal.

In this way, the on, off and alarm status of electrical Ia appliances at remote locations can be monitored using two wires. Therefore, a low-cost, wiring-saving system can be realized.

Although the above embodiment uses an alarm signal in which an ON signal is intermittent, the alarm signal may be generated by intermittent OFF signals.

Furthermore, a signal obtained by intermittent off signals may be used as a signal representing information other than the alarm signal.

[Effects of the Invention] As explained above, the present invention comprises: a unidirectional current generating means for generating a current flowing in one direction; It consists of a unidirectional current detecting means for detecting a current flowing in one direction and an intermittent current detecting means for detecting the intermittent current flowing in the one direction, and a receiving means located at a distance from the transmitting means, and the transmitting means and the receiving means. Since two connecting means are provided for connecting the two, it is possible to monitor and display the on/off and alarm status of electrical equipment using 12 electric wires.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a partial block diagram of an embodiment of the present invention, Fig. 2 is a circuit diagram showing details of the intermittent current detection circuit of Fig. 1, and Figs. 3 (a) and (b). and (c) is a signal waveform diagram showing on, off and alarm states of electrical equipment;
Figure 4 is a detailed circuit diagram of another intermittent current detection circuit.
FIG. 5 is a circuit diagram showing a conventional remote display device. In the diagram, (1^)... Electricity +? ! transmitter circuit, Dl, ri2
... Diode, (15) ... On-state switch, (]6)
... Off state switch, ri17) ... Intermittent switching circuit, (5^) ... Monitoring display circuit, R3 ... Resistor, (18) ... Red light emitting diode, (19)
・・ Green light emitting diode, (20), (20^>
... It is an intermittent current detection circuit. Note that the same reference numerals in each figure indicate the same or corresponding parts. 19 Taniro'L Ryomaru Diode 4 Danunagi Denen Hiro Circuit Atsushi 3 Figure 5 Procedural Amendments July 5, 1999

Claims (1)

[Claims] a transmitting means comprising a unidirectional current generating means for generating a current flowing in one direction and an intermittent current generating means for intermittent the current flowing in the one direction; a unidirectional current detecting means for detecting the current flowing in the one direction; It is characterized by comprising an intermittent current detection means for detecting an intermittent current flowing in a direction, a receiving means located at a location away from the transmitting means, and two connecting means for connecting the transmitting means and the receiving means. Remote display device.