JPS6017160B2 - Closed circuit 2-wire door lock alarm device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a closed circuit two-wire doorway alarm device.

In order to operate the conventional closed-circuit two-wire doorway alarm device with high reliability, the device is extremely complicated and expensive, and as a result, facilities, maintenance, etc. are difficult. SUMMARY OF THE INVENTION An object of the present invention is to eliminate such conventional defects and provide a closed-circuit two-wire door lock alarm device that has an extremely simple circuit configuration, is highly economical, and has high reliability.

Embodiments of the present invention will be described in detail below with reference to FIG. 1 of the accompanying drawings.

The main body M of the device is equipped with a monitoring power supply E that supplies a monitoring current in series, and an emergency power supply E2 that reliably operates the alarm.The positive terminal of this monitoring power supply E is connected to the terminal A, and other emergency The power source 2 is connected to the emitter of a transistor Q of the alarm display circuit via a switch SE and a selector switch SC.

A lamp L for displaying an alarm as an alarm, a diode D3, and a common emergency relay Y are connected to the outside of the transistor Q. Note that when this embodiment is used in a multi-district manner, the diodes D4 and D5 are led out from the output display section of another line and connected to the common emergency relay Y. The base of the transistor Q is connected to the common negative electrode of the power supplies E, E2 through the anode and cathode of the thyristor SCR and the resistor R3.
The cathode of CR is connected to the positive electrode of the monitoring power supply G through a resistor R2, a second diode D, and a resistor R.

Further, a first diode D2 is connected between the cathode of the thyristor SCR and the terminal B. A plurality of cotton detectors DB, DB2, . . . DK each having normally closed contacts are connected in series between the terminals A and B through a closed two-wire loop.
The embodiment of the present invention has the above-mentioned configuration, and FIG. 1 shows the door-lock monitoring state at night when the switch SE is closed and the selector switch SC is connected to the positive terminal of the emergency power source E2. During normal operation, from the power supply, one line L,, L-diode D2
Since the gate circuit of the resistor R, the diode D, and the resistor R2 is shorted by the short circuit, the thyristor SCR does not operate. At this time, a constant monitoring current i is passed through the short circuit as a weak current through a resistor R3 to continue monitoring the lines L and L2. In this monitoring state, if a burglar enters and the line is cut off, for example, by opening the door cotton detector DB2, the thyristor SCR is triggered by a gate current flowing through it, so that the power source positive, the power source E2, and the power changeover switch SC- Transistor Q is operated by the current flowing through the circuit consisting of switch SE - emitter of transistor Q, base - anode of thyristor SCR, cathode - resistor R3 - power supply E. For this reason, the power supply E, the two switching switches SE from one power supply, the emitter of the transistor Q, the lamp OL collector <diode D3 - relay Y, > - the power supply E,
circuit is closed, lamp L and common emergency relay Y,
operates to notify the occurrence of an emergency situation.

In this reporting state, the power between the anode and cathode of the thyristor SCR is higher than the gate voltage, so even if the door cotton sensor D& is opened and the lines L and L are made conductive again, the power E. - Lines L, L2 - The short circuit of diode D2 ceases to function as a short circuit because the flow is blocked by the high reverse voltage, and the thyristor SCR is kept in the holding state and will not recover unless the power is turned off.

On the other hand, during the daytime when door-lock monitoring is not required, the switch SC is turned on to the monitoring power source E. In this state, for example, if the lines L, L2 are cut off due to the opening of the door lock sensor DB2, the thyristor SCR will be able to recover from the line breakage because the triggered voltage and the voltage between the anode and cathode are the same. When the monitoring current is conducted, the held trigger will be de-energized. Therefore, the thyristor SCR is short-circuited again and restored, and the once-operated common emergency relay Y and lamp L are also restored. That is, relay Y and lamp L are not maintained in an operating state. The present invention includes a closed two-wire line in which door vertical sensors having normally closed contacts are connected in series, and a positive electrode is connected to the first line side of this line, and a common negative electrode is connected to the second line side via a first diode. a thyristor circuit whose gate side is connected to the positive terminal of the monitoring power supply via a second diode and whose cathode side is connected to the first diode, and a switching circuit on the anode side of the thyristor. between the switching circuit and the common negative electrode; Since it is a closed circuit two-wire alarm device consisting of a connected alarm device, it has the following effects as a closed circuit two-wire alarm device.

'1} The above embodiment can be self-maintained with only the thyristor SCR circuit, regardless of Figures 2 and 3, which have a self-holding circuit for the district relay, so it is possible to omit the district relay. .

'2) Since the circuit voltage of the constantly consumed monitoring current can be reduced to less than half of the part-time operating voltage, the monitoring current can be extremely small.

'3} Depending on the application, switch SE or SC O in the main body.
You can easily control operation hold, no operation hold, no operation, etc. with just N and OFF operations, so you can use it separately during the night and during the day, and it is very convenient because it can be used in many ways, especially if it is used in multiple areas. .

As described above, according to the present invention, an economical and highly reliable closed-circuit two-wire doorway alarm device can be obtained, which can accurately detect that a door has been opened using an extremely weak monitoring current.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are electrical circuit diagrams showing embodiments of the present invention. A, B... terminal, L,, L2... line, M... main body, DB,, DB2... door lock sensor, SCR...
...Thyristor, Q...Transistor, E,...Monitoring power supply, E2...Emergency power supply, D, ~D5...Diode, R, ~R3. ...resistance, SE, SC...
・Switch, L.・・・． ...Lamp, Y,,Y2...”
relay. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 A closed two-wire circuit in which door lock sensors with normally closed contacts are connected in series, and the positive electrode is connected to the first line side of this circuit, and the common negative electrode is connected to the second line side via the first diode. a thyristor circuit whose gate side is connected to the positive electrode of the monitoring power source via a second diode and whose cathode side is connected to the first diode, and a switching circuit connected to the anode side of the thyristor. an emergency power source that is connected to the power source and has a higher voltage than the monitoring power source;
A closed circuit two-wire door lock alarm device comprising a changeover switch that switches the switching circuit between the monitoring power source and the emergency power source, and an alarm connected between the switching circuit and the common negative electrode.