FI77344C - TILL ETT TELEFONNAET ANSLUTBAR INTELLIGENT ALARMANORDNING. - Google Patents

Abstract

The invention concerns an intelligent alarm apparatus with interfacing to a telephone network, comprising of an alarm sensor (2), which is directly connected at a high impedance level via an integrator (2) and a detector (3) to the interrupt input of a processor (4) waiting in a power-saving mode. The interrupt generated to the processor (4) is adapted to activate an alarm transmission to an alarm control point. A power supply section (5) of the apparatus is connected to a telephone line (6), from which the apparatus obtains its power feed.

Description

1 77344

An intelligent alarm device to be connected to the telephone network. - Tili ett telefonnät anslutbar Intelligent alarmanordning.

The invention relates to an intelligent alarm device to be connected to a telephone network, which includes a detector sensor, a detector, a processor and an optional telephone network connection.

The general object of the invention is to provide an alarm device which can be connected to a telephone network, in which a new type of switching technology is used, by means of which an alarm message received from a sensor can be transmitted via a telephone network without a local voltage source.

There are currently different types of alarm sensors that can be connected to alarm centers, the alarm output of which is further connected to the telephone network by a robotic telephone.

The connection of current sensors is low-impedance. The alarm message is transmitted as a stream message to the alarm center. Several sensors can be connected to the alarm center's own detector inputs. The voltage supply of the sensors also takes place at the voltage source of the alarm center.

The alarm center forwards the detected alarm to the robotic telephone, which forwards the alarm to the alarm receiving point.

In a traditional system, a power supply and batteries are required in the alarm center. In addition, the robot phone also needs its own power supply and batteries. The batteries must be dimensioned in such a way that they are also sufficient to supply the loop currents of the detector. Loop currents are typically 5 to 10 mA to minimize interference. Small systems where one sensor would suffice would become unnecessarily complex and expensive.

Batteries also have a limited lifespan and failure will cause the majority of alarm device failures.

2 77344

The object of the invention is to provide an alarm device which replaces an alarm center and a robotic telephone, but includes their corresponding functions. It is a particular object of the invention to provide an alarm sensor which can be connected directly to the telephone network without the need for a local voltage source and batteries.

This object is achieved by the invention on the basis of the features set out in the appended claims.

Thus, according to the invention, one low-current detector sensor is used, which is in the same housing as the processor and which is connected high-impedance directly, without an alarm center, to the interrupt input of the processor. The processor is dormant in low-power so-called in standby mode. Only the interrupt activates the procedure by which the alarm is transmitted (as with a robotic telephone) to the alarm reception point.

The supply voltage is taken from the telephone network, from which a maximum current of 1 mA can be drawn according to the structural regulations of the telephone network.

Such low power consumption is obtained by the above-mentioned high-impedance sensor connection and keeping the processor in sleep mode, the so-called in standby mode.

In addition, the programming data is stored in an EEPROM memory, the voltages of which are connected only during reading or writing. The entire circuit design has also been done using known low current components.

During the sleep mode, the "tank capacitor" of the alarm device is also charged, which provides energy during the alarm state of the device.

In the following, an embodiment of the invention will be illustrated with reference to the accompanying drawings, in which Fig. 3 77344 shows a block diagram of an intelligent alarm device according to the invention and Fig. 2 shows a circuit diagram of the same alarm device in which the processor is shown in simplified form.

The main units of the device are the infrared sensor 1, the integrator 2, the detector 3 and the processor 4, as well as the power supply unit 5 with its tank capacitors 7 (C3 and C4 in Fig. 2).

The infrared sensor 1 is connected to an operational amplifier, which is connected as an integrator 2, the connection allows slow changes in the monitored field. The time constant of the change is determined by C1 and R2. When slow changes occur in the monitored field, such as room temperature, Cl is charged, so that the inverting and non-inverting inputs of the operational amplifier are affected by the same voltage and the output of the OP amplifier is "0".

In fast field changes where the time constant of C1 and R2 is slower, a fast pulse is obtained from the output of the OP amplifier to charge C2. C2, R6 and N1 act as a detector which prolongs the detected pulse and interrupts the processor 4.

In sleep mode, the processor is in low-power standby mode and initiates a call procedure when an interrupt is detected. The processor is equipped with a program by means of which the alarm can be transmitted via the telephone line 6 to either a home telephone, a control room and / or a remote paging device. The transmission of the alarm takes place in a generally known manner, which will not be discussed in more detail in this connection.

The voltage supply of the device is taken care of by the supply bridge S1 and the constant current generators TRI and TR2, as well as the tank capacitors C3 and C4. High-capacitance so-called supercapacitors charged via constant current generators TRI and TR2 at a constant current of 1 mA from telephone line 6. Capacitors C3 and C4 act as a backup voltage source when the selection is made or when there are short-term interruptions in the lines.

Claims (5)

1. An intelligent alarm device connectable to a telephone network, which includes a detector sensor (1), an indicator (3), a processor (4) and a connection to a selective telephone network (G), while the device is coupled to receive input voltage from the telephone network (6), characterized in that a low current detector (1) and indicator (3) are directly coupled with high impedance, ie. without an alarm center, to the interrupt input of a processor (4), and the interrupt of the processor (4) existing in a low current rest (4) is arranged to enable the transmission of an alarm to the receiving point of alarm. 2. An alarm device according to claim 1, characterized in that the voltage supply circuit (5), which can be connected to the telephone line (6) of the device, includes a supply bridge (SI), a constant current generator (TRI, TR2) and a tank capacitor (7; C3, C4). ), which is arranged to be charged with the constant current generator (TRI, TR2) at approximately 1 mA constant current from the telephone line (6). An alarm device according to claim .1 or 2, wherein the detector sensor (1) is connected to an operational amplifier coupled as integrator (2), characterized in that there is an indicator (3) between the operational amplifier and the processor (4). C2, R6, N1), which extends the fast pulses obtained from the output of the operational amplifier and which, when an impulse occurs, causes a break to the processor (4). Alarm device according to any of claims 1-3, characterized in that the device only has a low current detector sensor (1) located in the same housing as the processor (4). Alarm device according to any of claims 1-4, characterized in that the programming information regarding the selectivity of the telephone network is arranged for storage in the memory of the processor (4) EEPROM, whose voltages are connected only during the reading and writing period.