JPH0330958Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a theft alarm system that monitors thefts in buildings, apartments, etc. over a wide area using public telephone lines. The present invention relates to a repeater for a burglar alarm system that collects signals for each floor and sends detection signals to a central receiver installed in each building.

Conventionally, in this type of theft alarm system that uses public telephone lines, a heat ray sensor that detects infrared energy emitted from the human body is used as the theft sensor. A signal line is connected to a repeater installed on each floor, and when the sensor detects theft, the receiving circuit equipped with the repeater receives the detection signal using the sensor's relay contact output and displays an alarm. At the same time, a relay output is sent to the central receiver to issue a theft alarm, and the central receiver also sends a signal to the central monitoring center via a public telephone line.

By the way, the hot wire sensor used in the above device performs monitoring operation by receiving power supply from a repeater, and is provided with an operation display means to enable external identification of a sensor activated due to theft detection. There is. As a means of indicating this operation, an alarm indicator light is installed that lights up when heat rays from the human body are detected, but if only the alarm indicator light is used, a check is made in the monitoring area of the sensor to confirm which sensor has activated. An alarm is also displayed when someone intrudes, making it impossible to distinguish whether the theft was detected or the inspector. Therefore, in addition to the alarm indicator light, when theft is detected, a latching relay etc. is activated to mechanically display the alarm memory, and when the alarm is confirmed, the sensor power is cut off with a repeater and the sensor becomes inactive. This system prohibits inspectors from issuing alarms, and allows them to identify which sensor has issued an alarm by looking at a mechanical alarm memory display.

In addition, when there is no need for theft monitoring, such as during the day, the power supply to the sensor is cut off by a release button installed on the repeater, and relay output to the central receiver is prohibited. By returning the switch to the monitoring position, power is supplied to the sensor and monitoring operation is performed.

On the other hand, the hot wire sensor is connected to the repeater to form a closed loop through the sensor's relay contact, which closes when power is supplied.When theft is detected, the relay contact is opened to open the closed loop, thereby controlling the receiving operation of the repeater. Furthermore, even if the thief cuts the signal line, the theft can be detected.

However, in the above-mentioned theft alarm device, after confirming the sensor that has triggered the alarm due to theft detection, or when leaving the house, power is resupplied to the previously cut off sensor by operating a switch on the repeater. However, there is a slight delay in operation before a closed loop is formed when the sensor's relay contact closes due to power supply, so if power is constantly being supplied to the receiver circuit of the repeater or before a closed loop is formed, When the receiving circuit becomes operational, alarm detection is performed by the repeater, which causes a problem in that the repeater outputs a false theft detection signal to the central receiver.

The present invention was developed by focusing on these conventional problems, and in order to reliably prevent malfunctions when power is resupplied to the sensor, the sensor is normally monitored at the repeater of the burglar alarm device. An interlocking switch is provided that temporarily cuts off the power supply to at least the input circuit section of the receiving circuit and the sensor in conjunction with the operation of a check switch to confirm that the receiver is in the correct state, and the interlocking switch temporarily cuts off the power supply. The present invention aims to solve the above-mentioned problems by providing a power supply delay circuit that delays the power supply to the input circuit section of the receiving circuit by a predetermined period of time after the power supply is resupplied to the sensor.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is a block diagram showing the overall configuration of the theft alarm device according to the present invention.

First, to explain the configuration, numeral 1 is a heat ray sensor that detects infrared energy emitted from the human body and opens a built-in relay contact. Power is supplied from the repeater 2 using the power line _l1 , and by sequentially connecting the relay contacts provided on the hot wire sensor 1 in series, the signal line _l2
It is connected in a closed loop to the repeater 2. The output of the repeater 2 is connected to a central receiver 3 installed in a manager's room, etc., and the repeater 2 sends a theft alarm to a monitoring center panel 6 installed in a monitoring center etc. via a public telephone line 5. It is designed to be able to send out detection signals.

Further, a remote control operation unit 4 is provided corresponding to the repeater 2.
By operating the switch, it is possible to prohibit the central receiver 3 from sending a signal to the monitoring center board 6 when theft monitoring is not necessary, such as when going to work.

Next, to explain the operation of the embodiment shown in FIG. 1, in a normal monitoring state, each of the hot wire sensors 1 closes its relay contact as shown, and the relay
A closed loop is formed by the two signal lines _l2 .
In this state, if there is an intruder in any of the warning areas of the heat ray sensor 1, the infrared energy emitted by the intruder will be detected and the relay contact of the heat ray sensor 1 will open.
By opening the closed loop of the signal line _l2 , the repeater 2 receives the theft detection signal, and relays the signal to the central receiver 3 to display a theft alarm. A signal is sent to the monitoring center board 6 via the telephone line 5, and a warning is displayed to the monitoring staff that a theft has occurred in the building where the central receiver 3 is installed.

On the other hand, when there is no need for theft monitoring, such as during the daytime, the monitoring center panel 6 can be activated by operating the remote control unit 4 on the way to work.
The function of transmitting a signal to the hot wire sensor 1 is canceled, and the power supply to the hot wire sensor 1 via the power line _l1 is cut off in the repeater 2.

Furthermore, when leaving, power is supplied to the heat ray sensor 1 again by operating the switch on the repeater 2, and at the same time, the transmitting function of the central receiver 3 is restored to its original state by operating the remote control switch 4 to monitor theft. state.

FIG. 2 is a circuit block diagram showing an embodiment of the heat ray sensor 1 in the embodiment of FIG.

First, to explain the configuration, the heat ray detection section 1a uses a pyroelectric element or the like that outputs a detection signal when it detects infrared rays emitted from the human body.
A transistor Q ₁ is turned on by the detection signal of the hot ray detector 1a, a transistor Q ₂ has a relay 8 as a collector load, which is turned off when the transistor Q ₁ is turned on, and a light emitting diode or the like is turned on when the transistor Q ₂ is turned off. A transistor _Q3 is provided for lighting up an alarm indicator light 9.

In addition, the output of the hot ray detection section 1a is a transistor
The collector of transistor Q ₄ is connected to _a latching relay 10 which operates the storage display mechanism.
The set winding S is connected as a collector load, and when the latching relay 10 is set by turning on the transistor _Q4 , a memory display mechanism (not shown) provided in the hot wire sensor 1 is activated, and an external It is possible to identify that the heat ray sensor 1 is activated. On the other hand, as a means for resetting the latching relay 10, which is set and operated by turning on the transistor _Q4 , that is, the storage display mechanism, it detects that power is supplied between the power lines _l1 and _l1 ' and outputs an H level output. A comparator 7 is provided to generate
By turning on transistor _Q5 , reset winding R of latching relay 10 is energized to reset the storage display mechanism. The operation of the comparator 7 when the power is turned on is that the power supply voltage is applied to both ends of the resistor _R1 at the same time as the power is turned on.
As the voltage of the capacitor C ₁ is charged through the resistor R ₁ , the voltage to the negative input terminal of the comparator 7 decreases with a predetermined time constant, and the voltage of the capacitor C ₁ decreases with a predetermined time constant.
When the voltage reaches the same level as the reference voltage determined by the divided voltage of _R3 , the comparator 7 generates an H level.

In addition, for the relay contact 8r of the relay 8, which is deenergized by turning off the transistor _Q2 when the hot ray detector 1a generates a detection output, the signal lines _l2 and l are connected to form a closed loop as shown in FIG. ₂ ′ is connected. .

FIG. 3 is a circuit diagram showing an embodiment of the repeater 2 of the present invention in the embodiment of FIG.

First, to explain the configuration, 11 is a transistor
This is a receiving circuit in which Q ₁₀ to _{Q 13} are connected in multiple stages, and signal lines l ₂ and l 2 ′, which are connected in a closed loop to the relay contact 8r of the hot wire sensor 1, are connected between the input terminals 17 and ₁₇ ′, and the steady monitoring state is maintained. In the case, the input terminal 17,
Since a closed loop is formed between 17' and 17', the base of transistor _Q10 is connected to ground and turns off.
The next stage transistor Q ₁₁ is on, Q ₁₂ is off, and the final stage transistor Q ₁₃ is on. The collector of the final stage transistor Q ₁₃ is connected to the resistor R ₂₀ ,
It is feedback-connected to the base of the previous stage transistor _Q12 via _R16 . A reception indicator light 21 made of a light emitting diode or the like is grounded to the emitter of the transistor _Q12 , and the detection signal from the hot wire sensor, that is, the conduction of the transistor _Q12 when the closed loop between the input terminals 17 and 17' is opened. The reception indicator lamp 21 is turned on when power is supplied. The output of the receiving circuit 11 is taken out from the collector of the transistor Q ₁₁ and connected to the base of the transistor Q ₂₂ , and the output of the transistor Q ₂₃ , which has the receiving relay 12 as a collector load, is connected to the collector of the transistor Q ₂₂ via a resistor R ₂₄ . connected to the base. In the drive circuit for the reception relay ₁₂ , which is made up of transistors Q 22 and Q ₂₃ , the transistor Q ₂₂ is turned off when the transistor Q ₁₁ is turned on in the steady monitoring state, and therefore the transistor Q ₂₃ is turned on and the reception relay 12 is turned on. energize its relay contact, i.e. relay contact 1 for transmission to the central receiver;
2r is closed as shown. Further, the collector of the transistor Q ₂₃ that drives the reception relay 12 is branch-connected to the feedback circuit from transistors Q ₁₃ to Q ₁₂ in the reception circuit 11 via a resistor R ₂₅ , and there is a reverse connection in the middle of this branch connection circuit. A pair of diodes D ₁₂ and D ₁₃ are connected in the direction, and the diode
The connection between D ₁₂ and D ₁₃ is connected to the base of transistor Q ₂₂ via resistor R ₂₂ and also connected to ground via check switch 13, and further connected to the base of transistor Q 22 via resistor R 22 and grounded via each of diodes D ₁₂ and D ₁₃ . A selection switch 13a for selecting holding or non-holding of the receiving circuit 11 and a selection switch 13b for selecting holding or non-holding for the receiving relay 12 are connected in parallel. Since each of the receiving circuit 11 and the receiving relay 12 normally performs a holding operation in response to a sensor detection signal, each of the selection switches 13a and 13b is set to an open position (holding position) as shown.

Next, the power terminals 19, 1 for the receiving circuit 11
Looking at the power supply from 9', the collectors of the transistors Q ₁₀ to _{Q 13} of the receiving circuit 11 are constantly supplied with power through the power supply line L ₁ , while the transistors of the receiving circuit 11 Power is individually supplied to the input circuit section on the base side of _Q10 through a power supply line _L2 via a power supply delay circuit 16 including transistors _Q24 and _Q25 . The power supply delay circuit 16 uses the collector of the transistor _Q25 as the base of the transistor _Q24 so as to discharge and reset the capacitor _C14 connected to the base of the transistor _Q24 , and the base of the transistor _Q25 is connected to the base of the transistor Q25 through the resistor _R28 . A check switch 13 for confirming that the heat ray sensor 1 connected to the repeater 2 is in a normal monitoring state.
It is connected to the switch contact b of the interlocking switch 14 which is interlocked with the switch. The interlocking switch 14 in this power delay circuit 16 is switched to the switch contact b side, and the transistor Q ₂₄ is turned on by turning on the transistor Q ₂₅ .
The delay time from the resupply of power due to the restoration of the interlocking switch 14 after the power supply to the input circuit section of the receiving circuit 11 is cut off by turning off the power supply to the transistor _Q24 being turned on is shown in Fig. 2 at the time of power supply. Since the delay time until the relay contact 8a of the hot wire sensor 1 shown closes and forms a closed loop is about 0.3 seconds, the delay time is set to about 0.5 seconds by the time constant of the resistor R ₂₆ and the capacitor C ₁₄ . There is. Power is supplied to the interlocking switch 14 from the power terminal 19, and during normal operation the interlocking switch 14 closes to the switch contact a side as shown in the figure. Power is supplied to the hot wire sensor, and power is also supplied to the receiving relay 12 via the power line _L3 . Note that the check switch 13 and the interlock switch 14 are non-lock type switches, and the operation confirmation switch 15 is a lock type switch.

Next, the operation of the repeater of the present invention shown in the embodiment shown in FIG. 3 will be explained.

In the steady monitoring state, check switch 13
The interlocking switch 14 is switched as shown in the figure, and the terminals 18 and 1 are connected via the interlocking switch 14.
Power is supplied to the hot wire sensor 1 from 8', and therefore the relay contact 8r of the hot wire sensor 1
(See Figure 2) is closed by the energization of relay 8, so that the signal line between input terminals 17 and 17' is closed.
A closed loop of l ₂ and l ₂ ' is formed, and the transistor Q ₁₀ of the receiving circuit 11 is turned off, and the transistor Q ₁₁ is turned on.
Transistor Q ₁₂ is off and transistor Q ₁₃ is on. When transistor Q ₁₁ is turned on, transistor Q ₂₂ of reception relay 12 is turned off and transistor Q ₂₃ is turned on, energizing reception relay 12 and transmitting. Relay contact 12r is closed as shown.

Therefore, the reception indicator light 21 provided at the emitter of the transistor Q ₁₂ is off, and the interlocking switch 14 is switched to the switch contact a side, so the transistor Q ₂₅ of the power supply delay circuit 16 is turned off.
is off, transistor _Q24 is biased on by the charging voltage of capacitor _C14 , and the power line
Power is supplied to the input circuit section of the receiving circuit 11 via _L2 .

Next, if theft is detected in one of the hot wire sensors 1 connected between the input terminals 17 and 17' and the relay contact is opened, the power line L ₂
A base bias is applied to the transistor Q ₁₀ in the input circuit section of the receiving circuit 11 through the resistor R ₁₀ , and the transistor Q ₁₀ is turned on. Incidentally, the detection output from the heat ray sensor 1 is output from the relay contact 8r only while the heat ray detection section 1a in FIG. 2 is producing an output.
When the detection output is cut off, the relay contact 8r of the hot wire sensor closes again to form a closed loop.

In this way, when the transistor _Q10 of the receiving circuit 11 is turned on by opening the relay contact of the hot ray sensor, the next stage transistor _Q11 is turned off, the transistor _Q12 is turned on, and the final stage transistor _Q15 is turned off. ₁₃ off more resistance
A feedback voltage is applied to the base of the transistor Q ₁₂ through R ₂₀ and R ₁₆ , so that even if the detection output of the hot wire sensor is cut off and the loop returns to the closed loop, the transistor Q ₁₁ is turned on.
_Q12 is kept in the on state by the feedback voltage, the reception indicator light 21 is kept lit, and the transistor _Q13 is also kept in the off state. Therefore, the transistor _Q13 is kept in the off state.
The voltage from the collector of is the resistor R ₂₀ and the diode
D ₁₂ is also applied to the base of transistor Q ₂₂ via resistor R ₂₂ to keep transistor Q ₂₂ on, and turning on transistor Q ₂₂ turns off transistor Q ₂₃ and deenergizes the receiving relay 12. ,
The transmitting relay contact 12r is held open as shown by the broken line to generate a relay output to the central receiver, causing the central receiver to perform a burglar alarm operation.

In this way, when the theft alarm is activated, in order to confirm the hot wire sensor that detected the theft, the operation check switch 15 is switched to the switch contact b side in the repeater 2, and the hot wire is activated. The power supply to the sensor from the terminals 18, 18' is cut off, and the power supply to the receiving relay 12 via the power line _L3 is also cut off.

On the other hand, when detecting theft, _the circuit operation of the hot wire sensor ₁ shown in FIG. The relay contact 8r is opened as shown by the broken line, and at the same time, the latching relay 10 is turned on by turning on the transistor _Q4 .
The setting operation activates the storage display mechanism. In this state, when the power supply is cut off by opening the operation check switch 15 in the repeater 2, the latching relay 10 remains in the set operating state, and the setting operation of the latching relay 10 causes the memory display mechanism to change the display state. Since the hot wire sensor 1 remains in place, the security guard can confirm from the outside the heat ray sensor 1 that has detected theft in the guarded area.

Next, in order to return the repeater 2 to the normal monitoring state, the operation check switch 15, which has been switched to the switch contact B side, is returned to the switch contact A side, and the check switch 13 is operated to release the holding of the receiving circuit. . When the operation check switch 15 closes, terminal 1
Power is supplied to the hot wire sensor 1 from 8 and 18', and the comparator ₇ shown in FIG. Cancels the display of the display mechanism. Furthermore, when the power is resupplied to the hot wire sensor 1, the voltage applied through the resistor _R5 turns on the transistor _Q2 , energizing the relay 8, and about 0.3 seconds after the resupply of the power, the relay contact 8r closes to form a closed loop. I come to do it.

On the other hand, the interlocking switch 1 operates the check switch 13 of the repeater 2 shown in FIG.
4 to the switch contact a side, the transistor Q ₂₅ of the power supply delay circuit 16 is turned off, and charging of the capacitor C ₁₄ is started via the resistor R ₂₆ .
After a set delay time of 0.5 seconds after the power is resupplied, the transistor _Q24 is turned on and power is supplied to the input circuit section of the receiving circuit 11 via the power line _L2 . For this reason, power is constantly supplied to the receiving circuit 11 via the power line _L1 , and even if there is a time delay in forming a closed loop between the input terminals 17 and 17' for about 0.3 seconds when the power is resupplied. , until the set delay time of 0.5 seconds determined by the power supply delay circuit 16 elapses, _the reception circuit 11
Since power is not supplied through the resistor _R10 to the input circuit section of the transistor _Q10 , that is, the base side of the transistor Q10, the transistor _Q10 is kept in the off state even if a closed loop is not formed, and the hot wire is removed when the power is resupplied. This reliably prevents malfunctions caused by the sensor's closed loop being temporarily opened.

Note that the check switch 13, which is connected to the base of the transistor _Q22 forming the drive circuit of the reception relay 12 through a resistor _R22 , is operated by the reception circuit 11 to perform a holding operation based on the detection output of the hot wire sensor, and to perform the reception operation. When the check switch 13 is turned on while the relay 12 is held in the off state, the transistor Q ₁₂ of the receiving circuit 11 and the transistor Q ₂₂ in the drive circuit of the receiving relay 12 are forcibly turned off and the holding operation is released. do. Incidentally, although the above embodiment uses a heat ray sensor as an example, a theft sensor using other detection methods may also be used. Furthermore, if the check switch 13 and the interlocking switch 14 are lock type switches, the operation confirmation switch 1
5 may be omitted.

As explained above, according to the present invention, in the repeater of the burglar alarm device, at least the input circuit section of the receiving circuit and the sensor are connected to the operation of the check switch to confirm that the sensor is in the normal monitoring state. A power source that is equipped with an interlocking switch that temporarily cuts off the power supply, and when the power is supplied after the power supply has been temporarily cut off by the interlocking switch, the power supply to the input circuit section of the receiving circuit is delayed for a predetermined period of time before power is resupplied to the sensor. Since a delay circuit is provided, even if there is a time delay in forming a closed loop when power is resupplied to the sensor, the receiving operation of the repeater will be delayed beyond the time delay in forming the loop. The effect is that malfunctions are reliably prevented and a highly reliable theft alarm device can be realized.

In addition, in this invention, the delay in power supply to the input circuit section of the receiving circuit prevents malfunctions until a closed loop is formed when power is supplied to the sensor, so that the signal input to the receiving circuit is prevented. Compared to a method that directly delays the operation to prevent malfunctions, there is no delay in signal reception during operation, and theft detection can be performed with high sensitivity. Furthermore, since power is supplied to the output circuit of the receiver circuit from the secondary side of the operation check switch that turns off the power to the sensor, when the power to the sensor is cut off, the receiver output circuit of the repeater The power supply to the relay is also cut off at the same time, and it is easy to see at the repeater that the operation check switch has been forgotten to be turned back on. Furthermore,
Since the sensor power can be turned on and off without causing reception malfunctions in the repeater, a repeater can be obtained that can effectively utilize the mechanical alarm storage and display mechanism of the theft sensor that is activated when theft is detected. This makes it easy to check the detected theft sensor.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a burglar alarm device using the repeater of the present invention, Fig. 2 is a circuit block diagram showing an example of a hot wire sensor loop-connected to the repeater, and Fig. 3 1 is a circuit diagram showing an embodiment of a repeater according to the present invention. 1... Heat ray sensor, 1a... Heat ray detection section, 2...
... Repeater, 3 ... Central receiver, 4 ... Remote control unit, 5 ... Public telephone line, 6 ... Monitoring center panel, 7 ... Comparator, 8 ... Relay, 8
r...Relay contact, 9...Alarm indicator light, 10...
Latching relay, 11... Receiving circuit, 12...
Reception relay, 13...Check switch, 13
a, 13b...Selection switch, 14...Interlocking switch, 15...Operation confirmation switch, 16...Power supply delay circuit, 17, 17'...Input terminal, 18,1
8'...terminal, 19,19'...power terminal, 21...
...Reception indicator light, l ₁ , l ₁ ′... Power supply line, l ₂ , l ₂ ′...
...Signal line, _L1 to _L3 ...Power line.

Claims (1)

[Scope of Claim for Utility Model Registration] A theft sensor that detects and outputs illegal intrusion into a building where power is supplied through a power line is connected to a signal line, and is equipped with a check switch that restores the receiving circuit. In the repeater of the burglar alarm system, which relays and outputs the detection signal to the central receiver when the receiving circuit receives a detection signal from the receiver, at least the input circuit of the receiver circuit an interlocking switch that temporarily cuts off the power supply to the input circuit section and the sensor, and when the interlocking switch temporarily cuts off the power supply and then resupplies the power, the sensor 1. A repeater for a theft alarm device, comprising: a power delay circuit that delays power supply for a predetermined period of time before resupply of power to the device.