WO2007028673A1

WO2007028673A1 - Hazard warning system

Info

Publication number: WO2007028673A1
Application number: PCT/EP2006/064716
Authority: WO
Inventors: Markus Thuersam; Falk Herrmann
Original assignee: Robert Bosch Gmbh
Priority date: 2005-09-05
Filing date: 2006-07-27
Publication date: 2007-03-15
Also published as: EP1938294A1; DE102005041990A1

Abstract

The invention relates to a hazard warning system 1 having a functional module 2, which acts as a control centre, and having at least one detector 3 which is physically remote from the control centre. The control centre provides the detector 3 with power in a wireless manner.

Description

Alarm system

State of the art

The invention relates to a hazard alarm system according to the preamble of claim 1.

Security alarm systems, such as burglary and fire alarm systems, are systems that usually include a central office, as well as connected to this center detectors. The remote from the headquarters detectors are connected information technology via a radio link to the control center. In the case of a change of state, which is to be reported from an area monitored by the detector to the center, a corresponding data stream is transmitted to the control center. In the idle state, the connection between the detector and the center can be monitored by transmitting a cyclic idle data stream. If the data signal remains longer than a predefinable time, this is evaluated as a fault and / or sabotage message. This monitoring is in many cases an admission requirement for alarm systems. The required monitoring frequency can be up to once every 10 seconds (EN class 4 systems). The detectors connected by radio to the control panel can also be equipped with a power supply independent of the control panel. The power supply takes place for example via the detector associated batteries or mains-powered power supply units. Both batteries and mains powered

However, power units build very large, which is a miniaturization of the detectors in the way. In order to install detectors as inconspicuous and space-saving, however, a further miniaturization is required. Although it was already trying to get along with smaller batteries. However, these can provide comparatively little energy for the supply of the detector. This leads to regular monitored detectors for a short service life and requires a high service cost.

From DE 37 15 196 Al a hazard alarm system with a plurality of detectors connected to one or more two-wire loop lines is known in which a line module is provided for each detector, which is provided with a control device. In the line module, a switching means is present, which is initially open when commissioning the alarm system. The first line module connected to the central office receives an address from the central office, which is stored in the control device, and then the command for closing the switching means. In this way, successively all line modules to which the detectors are connected, provided with addresses, which they can be selectively controlled by the control panel and receive commands and send messages to the headquarters.

From DE 197 23 737 Al a ring bus system with a center is known, to which closed data lines are connected to a ring, in which bus components are looped. A supply line for the bus components has a fuse for the downstream bus components in a conductor. Electrically parallel to the conductor and the fuse is another conductor with fuse to the

Bus components laid. The bus components are connected to both conductors via decoupling diodes. If a short circuit occurs in one part of the powered cable ring, the corresponding fuse of the sub-ring is destroyed, but the remaining sub-ring, because decoupled via diodes, can continue to supply the bus components with voltage.

From DE 102 04 138 Al a communication device is known which has a transmitter and / or receiver having a signal coupling with an energy storage device for sending and / or receiving a radio signal. The energy store is preferably designed as a battery. The battery can also be element of one

Be magnetic loop antenna. Preferably, the communication device is used in a detector. In this document, although it is proposed to use an existing energy storage device in the communication device, such as a battery or a rechargeable battery, as an antenna. A charge of the energy storage over a radio link is j edoch not mentioned. Advantages of the invention

The alarm system according to the invention with the features of claim 1 allows despite further miniaturization of the detectors a very reliable operation of the hazard detection system, as always enough energy is available to regularly monitor the detectors in relatively short time intervals. The invention makes use of the wireless transmission of the energy required for the operation of the detector from the center. The security alarm system according to the invention provides largely miniaturized detectors without autonomous detectors on the objects to be monitored (for example doors, windows, works of art or the like)

Energy supply before. That is, the individual detectors are equipped in an advantageous embodiment of the invention neither with a large-sized battery nor connected to a mains-powered power supply device. Since the detector has no batteries, eliminating the high service costs for changing the battery. At the same time a strong miniaturization of the detectors is possible. The very small building

Detectors can be installed very inconspicuously. The state of the detectors is queried by radio in a conventional manner by corresponding query data from the control center to the detector and corresponding response data are transmitted from the detector to the control center. The polling frequency can be greatly increased since no limitation on the part of the energy supply is to be feared. This in turn benefits the operational safety of the alarm system, as there is always a precise overview of the status of the detector. This advantage is achieved in that the energy required for the supply of the detector is also transmitted wirelessly, namely from the center of the alarm system. For this purpose, the detector comprises an energy converter, possibly one, in addition to the transmitting and receiving antenna

Energy storage device, a logic module, a coding module and at least one sensor element. If the object secured by the security alarm system has a greater extent, according to an advantageous further embodiment of the invention, between the control center and the detector, or a group of detectors, additionally a function module is switched that for the connection of the detector or the detector to the center responsible is. Advantageously, for each monitoring unit of the object divided into monitoring units, for example for each room of a building to be monitored, such a functional module is provided which communicates with a plurality of detectors in the respective room. The connection between the function module and the control center is expediently made via a wired connection - A -

Data bus or alternatively via a wireless communication channel. The connection between the individual detectors and the function module is again wirelessly via a radio link.

drawing

Embodiments of the invention are explained in more detail below with reference to the drawing. It shows

Figure 1 is a schematic block diagram of a hazard detection system;

Figure 2 is a block diagram of a detector.

Description of the embodiments

FIG. 1 shows a schematic block diagram of a security alarm system 1. On the basis of this FIG. 1, two variants of embodiment of the invention will be described below

Alarm system 1 explained. In a first embodiment variant, the danger detection system 1 comprises a function module 2, which serves as the control center of the danger detection system 1. The functional module 2 comprises a functional module 2.5, which ensures the power supply of at least the functional module 2. Preferably, the functional module 2.5 is connected to the power grid. Furthermore, this includes

Function module 2 a functional module 2.1, which is intended for communication with a detector 3. The detector 3 shown in the block diagram of Figure 1, of course, represents here a larger number of detectors. The functional module 2.1 is a transceiver which is connected to the detector 3 via a communication channel 2.3. In the exemplary embodiment described here, the communication channel 2.3 is a bidirectional radio transmission path. The detector 3 comprises a functional module 3.2 and a functional module 3.3, as well as at least one sensor 3.1. The functional module 3.3 is a transceiver, which communicates with the functional module 2 via the communication channel 2.3. The functional module 3.3 has an antenna 20 for Transmission and reception (Figure 2). The functional module 3.2 is an encoding unit with which signals exchanged between the functional module 2 and the functional module 3 can be encoded or decoded. A corresponding functional module 2.7 is also arranged in the functional module 2. The sensor 3.1 is, for example, a contact, in particular a magnetic contact, with two operating states, namely open or closed. According to the invention, the detector 3 does not have an autonomous power supply, but is supplied via the communication channel 2.3, ie by radio, from the function module 2 with energy. For this purpose, two functional modules 22, 23 are connected to the antenna 20 of the functional module 3.3. The functional module 22 is connected to a memory device 21, which is outside the

Functional module is drawn lying, but can also be arranged in the functional module 3.3 itself. This memory device 21 is advantageously a capacitor or an accumulator in the smallest possible design with a comparatively small capacity. The functional module 23 is connected to the functional module 3.2.

In the following, the operation of this embodiment of the invention will be described. The focus is placed on the inventively designed power supply of the detector 3, while the data transmission between the detector 3 and the function module 2 is only briefly touched. To the detector 3 with

To supply energy, an electromagnetic field is generated by the transceiver 2.1 of the functional module 2 in an allowable Freguenzbereich the electromagnetic spectrum. Via the antenna 20 of the function module 3.3 provided in the detector, energy is withdrawn from the electromagnetic field. The function module 22 converts the recorded high-frequency voltage into a

DC voltage at which the memory device 21 is charged. The energy stored there is now available for the supply of the detector 3. In this case, different embodiments are available for the charging of the memory device 21. According to a first embodiment variant, the electromagnetic field provided by the functional module 2.1 can be constantly maintained. This is not particularly energy-saving, but has the advantage that the detector 3 can always rely on a fully loaded memory device 21. According to a more complex embodiment, means for querying the state of charge of the memory device 21 are provided in the detector 3. Once the memory device 21 is fully charged, is via the communication channel 2.3 transmit a corresponding signal to the functional module 2, which leads to a temporary shutdown of the electromagnetic field. In addition, a second threshold for the state of charge may be provided, below which the electromagnetic field is reactivated. According to a third embodiment, the electromagnetic field is switched on only in connection with a query of the detector 3, for example, only shortly before a query of the detector 3. When the detector 3 is queried, the current switching state of the sensor 3.1 installed in the detector 3 is interrogated and the detected state of the sensor 3.1 is transmitted to the function module 2. If the detector 3 can not be reached during the query, this is interpreted by the function module 2 as an alarm situation. These

Alarm situation can be caused by a fault, a defect or sabotage. An alternative embodiment of the interrogation of the detector 3 is realized in that the detector 3 comprises a resonant component, for example a SAW element based on acoustic harmonics, which is connected to the antenna 20. The resonant component reflects the received

Radio frequency energy and modulates it so that the function module 2 can close the identity of the detector 3 and its state. Such a modulation may e.g. be realized by the generation of characteristic pulse sequences in the time domain.

In the case of a greater extent of an object to be monitored by the security alarm system 1 and greater distances between the functional module 2 and the detector 3, an advantageous further embodiment variant of the invention is to be preferred. This embodiment is also explained with reference to Figure 1 and Figure 2. This embodiment additionally comprises a functional module 4, which is functionally connected between the functional module 2 and the detector 3. For example, in addition to at least one function module 2 acting as the central unit, a plurality of functional modules 4 may be provided. In this case, one functional module 4 is advantageously assigned to each one monitoring unit of an object, for example each room of a building. Each functional module 4 in turn can be assigned a larger number of detectors 3. In terms of data, the functional module 4 is connected to the functional module 2 via a wired data bus 2.2 or a wireless communication channel 2.4, such as a radio link. In order to enable a radio connection with the functional module 2, the functional module 4 advantageously comprises a functional module 4.1, which serves as a transceiver. The connection between the Function module 4 and the detector 3 is preferably again via a wireless communication channel 3.4, namely a radio link short range. Connection in this context means both the exchange of data between the functional module 4 and the detector 3 and the power supply of the detector 3 via an electromagnetic field generated by the functional module 4. The

Function module 4 comprises for this purpose a function module 4.3, which serves as a transceiver for short ranges and communicates for this purpose with the function module 3.3 of the detector 3. In the case of a cable connection between the functional module 2 and the functional module 4, the functional module 4 can also be supplied with energy from the functional module 2. If the functional module

4 is connected via a wireless communication channel 2.4 with the function module 2, it is expedient to provide an autonomous power supply for the function module 4. For this purpose, the functional module 4 comprises a functional module 4.2, in which it is preferably a power supply unit. The operation of this embodiment of a security alarm system 1 essentially corresponds to the

Operation of the first embodiment described above, with the difference that results from the interposition of the functional module 4 between the functional module 2 and the detector 3. The exchange of data between the functional module 2 and the detector 3, in particular in the query of the state of the detector 3, lower integration of the functional module 4, which is practically as

Relay station is used. The wireless power supply of the detector 3 is performed by the functional module 4. The use of the functional modules 4 advantageously enables the monitoring of extended objects.

Claims

claims

1. danger alarm system (1) with a functioning as a central function module (2) and with at least one locally remote from the central detector (3), characterized in that the detector (3) is supplied by the center on wireless way with energy.

2. hazard alarm system (1) according to claim 1, characterized in that the functional module (2) comprises a device (functional module 2.1) for the generation of an electromagnetic field that the detector (3) means

(Function module 3.3) for receiving the electric field generated by the functional module (2), and that the detector (3) further comprises a memory device (21), the energy derived from the electromagnetic field can be supplied.

3. hazard alarm system (1) according to any one of the preceding claims, characterized in that the means provided for the generation or the reception of the electromagnetic field devices are also provided for the transmission of data between the functional module (2) and the detector (3).

4. hazard alarm system (1) according to any one of the preceding claims, characterized in that it is a bidirectional data transmission.

5. hazard alarm system (1) according to any one of the preceding claims, characterized in that a functional module (4) is provided, which is functionally connected between the functional module (2) and the detector (3).

6. hazard alarm system (1) according to any one of the preceding claims, characterized in that the detector (3) from the function module (4) is supplied with energy.

7. hazard alarm system (1) according to any one of the preceding claims, characterized in that the functional module (4) locally from the functional module (2) is discontinued.

8. hazard alarm system (1) according to one of the preceding claims, characterized in that one of the hazard warning system (1) monitored object in

Monitoring units is divided and that for each monitoring unit, a function module (4) is provided.

9. hazard alarm system (1) according to any one of the preceding claims, characterized in that each functional module (4) is associated with a plurality of detectors (3).

10. hazard alarm system (1) according to any one of the preceding claims, characterized in that a for the power supply of a detector (3) constructed electromagnetic field is maintained constant.

11. hazard alarm system (1) according to any one of the preceding claims, characterized in that one for the power supply of a detector (3) is maintained until the complete charging of the memory device (21) and then turned off.

12. hazard alarm system (1) according to any one of the preceding claims, characterized in that the electromagnetic field for the power supply of the detector (3) in each case only in connection with or shortly before a status inquiry of a detector (3) is activated.

13. detector of a hazard detection system (1), preferably a hazard alarm system (1) according to one of the preceding claims, characterized in that the detector is designed such that it from a locally remote, functioning as a central function module (2) on wireless way with energy is supplied.