DE2264025A1 - INFORMATION SYSTEM - Google Patents

Description

Yukio HONDA, No. 20-3, Nakano 3-chome, Nakano-ku Tokyo, Japan

Akira Tazaki, No. 28-8, lianegi 2-chome, Setagaya-ku Tokyo, Japan

Information system

The invention relates to an information system with at least one transmitter and one receiver.

In conventional information systems, for example a fire alarm system, one usually uses a separate transmission line exclusively for transmitting one Alarm signal to a monitor of a receiver. The alarm signal is generated by the transmission line enclosing circuit is opened or closed. As a rule, several such detectors are provided. With such a known system in which a separate transmission line is used for several detectors it is very difficult to identify the location of the un-

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if to detect when an alarm signal has been delivered to the receiver's monitor from one of the detectors. In other words, it is almost impossible to determine exactly which detector is in the working position when an alarm has been triggered. For this purpose, the transmission line must always be found on who the alarm was given. In addition, if several detectors are used at the same time, this is not possible it can be determined whether, when the alarm is given, a fire has broken out in only one place or in different places. Therefore both the place or the places remain where the fire broke out, as well as the strength of the fire unknown until you have the number or numbers of the transmission lines connected to the alarm-issuing detector or the alarming detectors are connected. Accordingly, it is necessary in the event that several Detectors connected to a single transmission line took quite some time to localize the scene of the accident is. Accordingly, in a larger architectural facility, such as a large building or a Tunnel, a larger number of circuits must always be provided, for example for each floor or. every Construction stage one to overcome the above difficulties. Requires such a large number of circuits However, high costs and requires a multi-channel pilot line, which in an already existing building with is associated with great difficulty.

The invention is based on the object of specifying an information system of the type mentioned at the outset which is simple in design is and in which the information-giving transmitter on the receiving end can easily be determined.

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This object is achieved according to the invention in that several transmitters via power lines with one AC current or voltage source and a receiver are connected so that each of the transmitters has a detector, with which the information change of an item of information to be transmitted can be determined, one controlled by the detector Pulse oscillator, as well as a modulator, with which a pulse frequency specific to each transmitter synchronous with the alternating voltage on the power line can be generated for transmission to the receiver via the power line, and that the receiver with a device is equipped with which can be determined depending on the specific pulse frequency of that transmitter for each transmitter who sent this pulse frequency.

In the case of the specified information system, an existing on the line between the sender and the receiver AC signal modulated by the transmitter in a manner specific to each transmitter in such a way that on the Side of the receiver can be easily determined which transmitter is in operation. By querying the AC voltage signal lying on the line can be determined on the side of the receiver from the special address of the Determine modulation signal immediately which detector is sending this signal. The modulation can be turned on A simple way to achieve that the AC voltage signal on the line, the address signal is superimposed.

It is also advantageous if the power lines are formed by existing transmission lines are. This eliminates the need for a special transmission line

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between the transmitters and the receiver.

Another advantageous embodiment is that the transmitters are each arranged in electrical devices are. This feature is particularly important if the electrical devices that accommodate the transmitters are connected to each other via a common power line, which are used to transmit the modulated Signals. As a result, such an information system can also be used in larger buildings without great effort to install.

The present invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing explained. Show it:

1 is a block diagram of display circuitry according to the invention and diagrams of modulated ones Signals and pulse trains as used here Oscillator and modulator circuits occur;

2 shows a first circuit arrangement of an inventive Transmitter;

3 shows a second circuit arrangement of an inventive Transmitter and

4- (A) and 4 (B) possibilities of how an inventive Transmitter can be attached to an electrical device.

In the drawing and the following description, the same parts are provided with the same reference numerals.

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The display circuit arrangement shown in Fig. 1 is provided with a contact type detector and connected via a '■ power line to an alternating current power source S. For the sake of simplicity, only one detector D1 is shown in the drawing. This detector D1 is representative of a number η of detectors DI-Dn which are connected to the power line PL.

A receiver labeled R is connected to a further energy source 1 for operating a monitor and an alarm transmitter 2 equipped. Each of the detectors DI-Dn has a contact 3 with a gas or moisture-sensitive Element, a heat-sensitive element such as bimetal or a metal foil that acts on the breakage a pane of glass responds, or a similar element is provided. This contact 3 enables a circuit to close, which contains the energy source 1, in order to address an alarm transmitter 2, which is e.g. a fire alarm transmitter allow.

Each of the detectors DI-Dn is individually connected to an operating power source equipped, which is fed from the power line PL and to an oscillator and modulator circuit M is connected. This circuit M contains the following subcircuits: a voltage detector 4 ·, the synchronous with an alternating current signal c with respect to the voltage zero point 0 or a predetermined voltage point V. (hereinafter referred to as the voltage reference point) works; a, clock 5 »which is controlled by a signal that with the AC signal is synchronous and supplied to the clock from the voltage detector 4-; a pulse oscillator 6, using the periodic pulse signals or time division multiplexed signals

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(especially pulse signals where the pulse duration
constant and the frequency is variable), can be generated,
to trigger the ignition phase of a thyristor 7, whereby
the alternating current signal on the power line PL
Single pulse signal can be modulated.

As can be seen from Fig. 1, the single pulse modulation is carried out by a modulator circuit which is controlled by the
Thyristor 7 »a capacitor C1, resistors R1 and R2
and an inductance L1 is formed. This single pulse modulation of the alternating current signal on the power line PL takes place over a short period of time. If the contact 3 is closed after detecting a change in a variable to be monitored, the resistor R3 is short-circuited, whereby the bias voltage of the voltage detector 4- and
of the clock 5 changes. The pulse modulation takes place after
a predetermined time delay from the reference point, whereby addressing takes place. This pulse modulation fp ^ -fpn can be achieved, for example, by a blocking oscillator, a monostable multivibrator, a direct current chopper circuit, a pulse frequency modulation circuit, a glass delay element or a multi-stage CR (L) filter with which the pulses Di-Dn shown in FIG. 1 can be generated . The alternating voltage lying on the power line PL is, as shown in the sub-figures A and B of Fig. 1, modulated a pulse of short duration, which is synchronous with the frequency of the voltage zero points or pre-loaded reference voltage points of the alternating voltage.
The modulated waves fp1-fpn, which are superimposed on the alternating voltage wave and contain predetermined individual addresses, are transmitted to the receiver R via the power line PL.

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The receiver R contains a low-pass filter LP and a High-pass filters HP, which are connected to the energy source S. The output signal from the high-pass filter HP is one AND gate of a logic circuit 10 via a Schmitt or double limiter circuit 12 is supplied after it has passed through a detector 11 to a pulse signal was decoded. The output signal of the low-pass filter LP, on the other hand, becomes this gate of the logic circuit 10 through a voltage detector 13j of the one with the voltage reference voltage point synchronized from the energy source finds a pulse generator 14 and a monostable multivibrator 15 supplied. The output of the logical Circuit 10 is in turn via a relay 16 an individual indicator SI-Sn of an alarm display device I? supplied, in which the display elements SI-Sn corresponding Detectors Di-Dn are assigned.

When the detector D1 detects the change in a variable to be monitored, the contact 3 closes, o a signal fp1-fp2 is superimposed or modulated on by the alternating voltage signal on the power line PL. This signal is transmitted to the receiver R, where it is decoded and is used to actuate the relay 16 provided in the receiver, which allows an alarm transmitter 2 to respond in a known manner. As already mentioned above, the pulse oscillator 6 is actuated by closing the contact 3 and generates a pulse signal fp1-fpn which modulates the alternating voltage signal synchronously with the voltage zero points 0 or reference voltage points. This modulated signal is transmitted via the power line PL by appropriate switching and control processes in the thyristor 7 as a modulation signal of the alternating voltage. This time division multiplex modulation

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can be achieved in a simple manner in that the ignition phase of the thyristor 7 is set as a function of the voltage wave. Since according to the extremely short Pulse duration a thyristor with a very small capacity is sufficient, the transmitter can be made very simple and compact. Therefore, as will be explained further below, the transmitter can also be easily integrated into one accommodate electrical device. ;

Since the pulse signal modulated onto the alternating voltage wave does not pass through the low-pass filter LP in the receiver R. can, it is fed to the Schmitt circuit 12 via the high-pass filter HP and the detector 11, where it is shaped and is decoded. This decoded pulse signal 'becomes the logic circuit 10 supplied. Your alternating voltage signal The modulated pulse signal fp1-fpn is, as stated above, synchronous with the voltage wave of the voltage the energy source. The original alternating voltage wave passing through the low-pass filter LP generates a reference pulse train, which is synchronous with this alternating voltage wave and serves to discriminate the decoded pulses. This The reference pulse train is fed to the monostable multivibrator 14, where the pulses are lengthened for comparison with the decoded and shaped by the Schmitt circuit 12 pulses in the logic circuit 10 to ensure and generate a final output signal. How the logic circuit or AND gate works 10 is not affected by the fact that no clock pulse synchronous with the reference voltage point occurs, even when there is a decoded pulse. This will prevent any malfunctions that could result in malfunctions the power line.

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The output of the logic circuit 10 (AND gate) controls the alarm display device 17 S1 of this display device 17 only responds when a pulse signal fp1 occurs, which can be detected in the receiver is that the detector reporting the indication is detector D1. The indicators speak in the same way S2, S3 ... Sn when the detectors (not shown) D2, D3 ... Dn report a certain event. The display means are provided with oscillators, which individually cyclic frequencies or combinations of pulses fp2, fp3 ... fpn are assigned.

2 shows an embodiment with a known ion smoke detector D1 and a blocking oscillator circuit 26 in the oscillator and modulator circuit M. If smoke enters an outer ion space 22 of the detector D1, the connection point of this ion space with an inner ion space 21 loses its voltage equilibrium, whereby a field effect transistor FET becomes conductive. As a result, the voltage Ec across the resistor R3 causes a JSener diode (not shown) to be conductive, as a result of which a clock generator 25 is triggered in the next stage. This clock generator 25 is blocked by a signal from a voltage detector 24. This voltage detector 24 serves to rectify the current of the energy source and to synchronize the voltage base point as a function of the control voltage Ec. The above-mentioned oscillator circuit 26 effects time-division multiplex modulation. This circuit forms a kind of positive feedback oscillator circuit, which consists of diodes d1, d2 and d3, a transformer t, resistors r1, r2, ^- r3i, a capacitor c1 and a transistor Tr, which sets an oscillation in motion when it receives one

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sufficient bias is supplied by the control voltage Ec. The clock 25 is controlled by the control voltage EC kept on standby and starts to work when a clock voltage Es of the voltage detector circuit 24 occurs. The oscillator circuit 26 operates in response to a voltage of a detected signal, which is superimposed on the alternating signal synchronized with the signal from the energy source. This oscillator circuit 26 is advantageously used to ensure precise synchronization and an accurate cyclic switching according to the time constant determined by a capacitor and a Resistance is formed to achieve. The impulses sent to the receiver via the power lines PL1, PL2 modulated AC voltage signal is there on the same Way as already shown with reference to Fig. 1, treated.

In Pig. 3 shows a further exemplary embodiment. The detector D1 is equipped with a metallic foil 32, which is applied to a window glass 31. In this embodiment are a crystal oscillator or a glass delay line and a NAND gate signal generator 36 in the oscillator and modulator circuit M connected to the detector D1.

If the window 31 breaks, the metal foil will too 32 interrupted, creating an electrical circuit which contains this metal foil 32 opens. By opening this electrical circuit, the voltage balance at junction 33 is lost, creating a clock 35 of the following stage is triggered · This Clock 35 is controlled by the control voltage Ec and a signal a synchronization signal transmission circuit 34- closed. This contains a zener diode, which is used to power the

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Rectify energy source and the reference voltage ascertain. This is how the HAND gate signal generator is used 36 a cyclic modulation with a specified time delay is achieved.

The aforementioned NAND gate signal generator 36 is implemented by NAND circuits 39 and 39 ¹ »as described in Pig. 3 are shown. The output of this circuit is fed back to the input via a time delay element 38. A thyristor 37 is controlled by the control voltage Ec and the synchronized signal voltage Es in accordance with a predetermined time delay time. In other words, the output pulse of this NAND gate signal generator 36 triggers the thyristor 37, as has already been explained with reference to FIG. Such a NAITD gate signal generator 36 is advantageously used to generate precise time-division multiplex pulses, since this is easily possible with such a generator.

Although a power line was used for a transmission line in the above embodiment, the same can be done for the same Purpose, of course, any other existing line can be used, via which AC voltage signals let transfer.

In Fig. 4 is a from the detector D1 and the oscillator and modulator circuit M of existing transmitters attached to electrical equipment. Fig. 4 (A) shows the transmitter D1 + M with a contact 3 »which can be removed from an open to be attached to a ceiling Fluorescent tube assembly LP is attached. This is on the input terminal of the fluorescent tube arrangement EL

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closed. Fig. 4 (B) shows the transmitter D1 + M with a Smoke detector attached to the base of a decorative electric stand lamp, attached to the Power lines PL1 and PL2 connected and covered with a decorative cover 42. Here the Transmitter D1 + N on an electrical device through already existing screws 43 without additional work be attached. Numeral 44 denotes the screen of the stand lamp LP.

The transmitter can be attached in this way on or in an electrical device in which a corresponding Space is left out when there is good external space. Accordingly, the transmitter can automatically or simultaneously with the Assembly of such an electrical device can be attached, with an extra operation not required is.

A transducer, for example, can also be used as detectors be provided for an air conditioning system or other detectors, e.g. an automatic control of an air conditioning system, cause an automatic monitoring of a measuring device, a production process, a motor control, etc. The invention is therefore not limited to alarm systems.

Referring to FIG. 2, it should also be pointed out that instead of pulse frequency modulation, there is also a modulation with a multi-stage LC filter is applicable to control the drive voltage of the oscillator. The precision of the pulse signal should be determined depending on the amount of information to be transmitted.

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According to the present invention, each of the detectors is equipped with a pulse oscillator, the pulses with generated at a given address. The switching function is triggered by a circuit of the detector, the responds to certain data. An alternating voltage signal, which is modulated by individual pulses, is over a power line that is usually used for a larger number of detectors. Of the Depending on the address of the modulated pulse signal3, the receiver distinguishes which detector is emitting a signal Has. This allows the receiving center to be centralized and it is enabled to take immediate countermeasures. The use of a power line or an already existing transmission line over which alternating voltage can be transmitted has the further advantage of that a multiplex transmission is made possible in a simple manner, without the need for new transmission lines in addition to already existing power lines would have to be built. The energy source 1 (Fig. 1) for the monitor can also take place the AC power source S can be used. Another advantage of the present invention can be seen in the fact that the Effort to install such a device and the size of the device can be kept very small because the transmitter can be prefabricated together with an electrical device without affecting the appearance of the device would.

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Claims (4)

Claims Information system with at least one transmitter and one receiver, characterized in that that several transmitters (DI-Dn, M) via power lines (PL) with an alternating current or voltage source (S) and a receiver (R) are connected, that each of the transmitters has a detector (DI-Dn) with which the information exchange a piece of information to be transmitted can be determined, a pulse oscillator (6) controlled by the detector, as well as a modulator (4) with which a pulse frequency specific for each transmitter is synchronized with the alternating voltage Dor power line can be generated for transmission to the receiver via the power line, and that the Receiver (R) is equipped with a device with which, depending on the specific for each transmitter Pulse frequency of that transmitter can be determined, which sent this pulse frequency. 2. Information system according to claim 1, characterized in that the power lines (PL) formed by existing transmission lines are. 3 · Information system according to claim 1 or 2, characterized indicated that the transmitters (DI-Dn, M) Each are arranged in electrical devices. 309827/089 7 4. Information system according to at least one of claims 1 to 3, characterized in that the The oscillator and the modulator of the corresponding transmitter (Di-Dn, are formed by a blocking oscillator. 5 · Information system according to at least one of the claims. 1 to 3 »characterized in that the The oscillator and the modulator of the respective transmitter through a glass delay line and a NAND gate signal generator (36) are formed. 309827/0897