JP2885445B2 - Wireless security system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fire detector laid at a key point in a security area,
A wireless security system that wirelessly transmits detection signals from the transponder that detect abnormalities such as fires, intruders, and gas leaks from intruder detectors, gas leak detectors, etc., and notifies the control center via the controller. More particularly, the present invention relates to a wireless security system having a battery-operated transponder for transmitting a radio signal of the various abnormality detection signals in a battery-driven transponder and having a battery save function of suppressing consumption of the battery.

(Prior art)

2. Description of the Related Art Conventionally, various battery saving methods have been proposed and implemented in which various electronic devices such as components of a security system are formed in a battery-driven type and the consumption of the battery is suppressed as much as possible. For example, JP
Japanese Patent Application Publication No. 2140 discloses a battery saving method for a mobile phone having two circuit systems, a first system and a second system, which can wirelessly communicate with a base station. However, in this method, the first system including the receiving unit is always supplied with power from the battery, and the battery is not saved. Also, Japanese Patent Application Laid-Open No.
No. 110746 discloses a battery saving method for a security system. That is, when the security mode is set, the controller issues a standby signal transmitted prior to the security mode signal, and the battery-driven receiving circuit that receives the standby signal and the abnormality detection signal includes:
The security mode signal can be received only during a short time interval that matches the drive timing driven by the drive pulse from the battery, thereby minimizing the drive time of the receiving circuit by the battery and achieving battery save. .

[Problems to be solved by the invention]

However, in the above-described battery save method, the standby signal must be transmitted for a longer period than the pulse period of the drive power pulsed for the purpose of battery save so that the standby signal can be reliably captured. Therefore, even if an abnormality detection signal is input from the abnormality detector side while the signal width of the standby signal continues, there is a problem that the abnormality signal is received until the standby signal ends and cannot be transmitted to the controller side. In the security system field, promptness is required from the generation of an abnormal signal to the start of security measures, which is inconvenient, and therefore, a battery save system that can balance battery suppression and transmission of abnormal information as soon as possible. Is required.

Therefore, an object of the present invention is to propose means for solving the above-mentioned problems, that is, to suppress the battery consumption of the battery-driven transponder by synchronizing the operation timings of the controller and the transponder (battery save). The purpose of the present invention is to provide a wireless security system aiming at the above.

[Means for solving the problem]

That is, according to the present invention, at least one or more abnormality detectors laid at important points in a security area, a transponder for transmitting a detection signal connected to the abnormality detector, and wirelessly communicating with the transponder A transponder comprising: a battery power source; a transmitting unit receiving power from the battery power source only when transmitting a detection signal to the controller; A receiving unit that receives supply of a power pulse from the battery power source for each cycle, and a synchronization between the reception timing and the start timing of the supply of the power pulse in the fixed cycle when the receiving unit receives a synchronization signal generated by the controller. Synchronizing means for forming a system startup state and a system startup state Control means for continuing power supply to the receiving unit for a predetermined time upon receiving a standby signal having a signal width shorter than the predetermined period which is transmitted prior to the security mode signal issued by the controller after the formation. The standby security signal having a signal width shorter than a predetermined period and a security mode signal following the standby signal are set to the security mode so that the detection signal can be transmitted immediately, thereby providing a wireless security system. You. Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the accompanying drawings.

〔Example〕

FIG. 1 is a block diagram showing the configuration of a wireless security system according to an embodiment of the present invention, wherein 1a to 1l show a fire,
An abnormality detector (sensor) for detecting an abnormality such as an intruder occurrence or a gas leak, and is installed at a key point in the security area A where security is requested. Also, 2a ~ 2m is the above-mentioned abnormality detector
A transponder for wirelessly transmitting detection information via an antenna in response to reception of a detection signal from 1a to 1l, or for receiving a standby signal or a security mode signal via a repeater 3 described later. The transponder 3 is the transponder 2a
Signals are transmitted and received by a weak radio wave of up to 2 m, and signals are transmitted and received to and from a controller 5 described later via a communication line or communication line 4 by wire. The controller 5 includes the repeater 3
A device that sends and receives signals, sets various security modes, displays abnormalities, and sends signals to the control center 7 that is an external centralized monitoring station.
It is installed in the appropriate place in. Reference numeral 6 denotes a communication line such as a public line. The communication line 6 connects the controller 5 to a control center 7 for centrally monitoring the security area A shown in FIG.

FIG. 2 is a block diagram showing a more detailed configuration of a part of each component of the security system shown in FIG. In FIG. 2, the abnormality detectors 1a and the like for detecting the various abnormalities described above are collectively indicated by reference numeral 1. The transponder 2 (2a to 2m) is connected to the abnormality detector 1 and inputs a detection signal from the detector 1 to the detection unit 21.
A control unit 22 for performing various controls in the transponder 2,
Various signals with address numbers to be described later are wirelessly transmitted.
For example, a transmitting unit 23 for transmitting a weak radio wave, a receiving unit 24 for receiving a radio signal from the repeater 3, and a transponder 2
An address setting unit 25 configured by, for example, a dip switch, for setting an address, a battery power supply 26 for supplying driving power to the above units, and an antenna 27 for transmitting and receiving wireless signals.

The repeater 3 includes a control unit 32 that performs various controls in the repeater 3.
A transmitting unit 33 for wirelessly transmitting a standby signal or the like to the transponder 2, a receiving unit 34 for receiving a wireless signal from the transponder 2, an address setting unit 35 for setting an address of the transponder 3 itself, and a controller. 5 DC power supplies 56
Power supply that inputs DC power from the
36, a communication unit 37 for transmitting and receiving signals to and from the controller 5 via the communication line 4, and an antenna 31 for wirelessly transmitting and receiving to and from the transponder 2.

The controller 5 includes a communication unit 51 for transmitting and receiving signals to and from the repeater 3 via the communication line 4, a control unit 52 for performing various controls inside the controller 5 itself, and an input unit 53 for setting a security mode and the like. And a display unit 54 for displaying abnormality information and the like.
And a transmission unit 55 for transmitting a signal to the external control center 7 and a power supply 56 for generating DC power from AC power and supplying DC power to each unit and the repeater 3.

FIG. 3 shows one of the transponders 2a to 2m in FIG.
FIG. 2 is a block diagram showing a more detailed configuration of the control unit 22 of the transponder 2 typically shown in FIG. The transponder 2 is detected by a microprocessor 220 that performs various judgments and controls, a ROM 211 that stores various programs such as control programs, a security mode signal transmitted from the controller 5 via the repeater 3, and an abnormality detector 1. RAM 222 that stores the respective abnormality detection signals, a transmitting unit interface 223 that connects to the transmitting unit 23, a receiving unit interface 224 that connects to the receiving unit 24, an address setting unit interface 225 that connects to the address setting unit 25, and a detecting unit 21.
And a detection timer 228 for synchronizing a power pulse to the reception unit 24 and a timer 228 for measuring whether or not a synchronization signal is sent from the controller 5 within a predetermined time. It is provided and comprised.

In the wireless security system according to the present embodiment, the operator inputs a desired security mode to the input unit 53 of the controller 5, for example, “security (hereinafter, set)”, “security release (hereinafter, abbreviated as“ release ”),“ patrol ”, and the like. Is set by pressing a numeric keypad or inserting a card. Then, when the security mode is set, it is transmitted to the transponder 2 via the repeater 3. During the setting of the security mode, if the abnormality detector 1, for example, an intruder detector detects an abnormality, the detection signal is transmitted to the transponder 2.
And transmitted to the controller 5 via the repeater 3.
Also, when the abnormality detector 1 is an abnormality detector such as a fire or a gas leak, even if the security mode is the release mode, an abnormality signal is transmitted to the controller 5 in the same manner as described above due to the emergency action of the abnormal state. You.

However, if a failure or the like of the abnormality detector 1 occurs, even if an abnormality occurs, it cannot be detected, so that it is necessary to periodically check the state of each abnormality detector 1. Also, when the security mode is switched from the release state to the set state, it is necessary to check whether each abnormality detector 1 is in a normal monitoring state. Therefore, the controller 5 checks the status of the abnormality detector 1 as needed or as needed.

Next, the operation of the transponder 2 will be described with reference to the block diagram of the control unit 22 of the transponder 2 shown in FIG. 3, the signal diagram of FIG. 4, and the flowchart of FIG.

First, FIGS. 4A to 4C are signal diagrams of the wireless security system. The receiving unit 24 of each transponder 2 transmits the time t ₁ from the CPU 220 of the control unit 22 in a predetermined cycle (time width T ₁ ).
(For example, 10 milliseconds) indicates that the pulse-wave-like power signal P is supplied. In addition, these FIG. 4 (a)-
(C) also shows that the supply time of the first power signal P is different depending on the rise time of the transponders 2a, 2b, 2c. 4 (d) is the predetermined period of time width T ₁ (e.g., 5 seconds) than the somewhat longer duration T ₂ the controller 5 is generated during the rising edge of the system (e.g., 5.2 seconds) shows the synchronizing signal S is I have. Therefore, at the time of rising, the receiving unit 24 always receives the synchronization signal S while being driven by the power signal P, so that the operation synchronization between the controller 5 and the transponder 2 can be obtained.

Further, the synchronization signal S is issued at a fixed period, for example, every 30 minutes measured by clock means (not shown) built in the controller 5. This is because, as described above, after the controller 5 and the transponder 2 are synchronized by the synchronization signal S at the time of rising, the synchronization is re-established after 30 minutes, and therefore, the length of the synchronization signal S after the second time Has a length of T ₃ (for example, 2 seconds) shorter than T ₁ . In other words, time measuring means used in the controller 5 and the transponder 2 is used to select what falls within the error range of T ₃ following each other in 30 minutes.

4 (e) the receiving unit 24 when the security mode signal from the controller 5 (longer than t ₁₎ is issued, so that it can receive the security mode signal, an instruction to continue the power supply to the controller 5 is emitted in standby signal R, the width T ₃ that time is selected to be the relationship of T _1> T _3. Where 2
Times th and subsequent synchronization signal S and the standby signal R the same time width T ₃ so as to facilitate the process controller 5.

Further, the transponder 2 periodically monitors whether or not to receive the synchronization signal S from the controller 5, and therefore, the timer 228 is set to a monitoring period slightly longer than 30 minutes in the above example. Therefore, if the transponder 2 does not receive the synchronization signal S within a predetermined time (that is, 30 minutes), the CPU 220 forms a synchronization signal request signal requesting the synchronization signal S, and the transmitting unit that is not always supplied with power is twenty three
For a predetermined time (slightly longer than the time required for transmitting the synchronization signal request signal), and the address number set by the address setting unit 25 is added to the synchronization signal request signal. Transmitting unit 23,
The signal is transmitted to the controller 5 via the antenna 27.

Now, referring to the flowchart of FIG. 5 in which the transponder 2 is operating, the CPU 220 always reads the time information value of the synchronization timer 227 (step). At this time, CPU220
Performs's whether integer times or time information value T ₁ (step), when the time information value is an integer multiple of T _1, the power supply by brief only the power signal P to the receiving section 24 time t ₁ Power is supplied (step). The synchronization timer 227 is, for example, 100
It works as a clock that keeps time in milliseconds. The receiving unit 24 receives control signals such as a synchronization signal, a standby signal, and a security mode signal from the controller 5 while the power is on (step). First, the synchronization signal S generated by the controller 5 will be described.

In the case of the first time as shown in FIG. 4, the synchronizing signal S is a signal having a duration of T ₂ and a predetermined time period of the power signal P.
The time width is selected to be slightly longer than T ₁ (for example, 5 ms). Or, if the second and subsequent times, a signal to continue over a duration T _3.

Time width T ₂ are for example, by time information of every 100 milliseconds to 1 second from -4.2 seconds, or the time width T ₃ is formed by a time information for each 100 seconds in the time interval between 1 sec -1 sec I have. In the signal received from the controller 5, the read time of power ON of the receiving unit 24 of the transponder 2, i.e. when receiving a synchronization signal S at t ₁ (step), the time information value o'clock this t ₁ from the synchronizing signal S, This time information value is added to the synchronization timer 22
Set 7 (step). As a result, the operation timing of the controller 5 and the transponder 2 is synchronized. When the synchronization signal S is received, the timer 228 is set to 0 minutes and started (step), and the timer operation is started. That is, when the synchronization signal S is always received for a predetermined time, for example, every 30 minutes, the timer 228
Is set slightly longer than this, for example, 32 minutes. Therefore, if the synchronization signal S is normally sent from the controller 5 to the transponder 2, the timer operation of the timer 228 does not end. Synchronous signal S periodically generated
At, since the period of the controller 5 and the transponder 2 are taken when sending a security mode signal controller 5 is set in the input unit 53, always standby signal R (its period T ₃ prior example , 2 seconds) at the timing received at time t ₁ .

The standby signal R is, for example, a carrier (carrier).
It shall be formed only with. Transponder 2 CPU2
At 20, it is determined whether or not there is a signal received via the receiving unit interface 224, that is, whether or not the standby signal R is present (step). If it is determined that the standby signal R is present, the CPU 220 sends the receiving unit 24 a predetermined time t ₂ , for example, 3
Control is performed so that power is supplied for a second (step). In this predetermined time t _2, it is possible to receive a security mode signal sent after the standby signal R (step). Further, the security mode information instructed by the received security mode signal is stored in the RAM 222 (step). When the security mode signal is "set", the detection unit 21 is checked, and whether or not the abnormality detector 1 is in the monitoring state is transmitted to the controller 5 side. At this time, the CPU 220 supplies power to the transmitting unit 23 as described above. Further, the power of the detection unit 21 is also turned on for a predetermined period under the control of the CPU 220. When the power is turned on, the detection state of each abnormality detector 1 is checked. Then, in the case of an abnormality caused by an intruder, the CPU 220 reads whether or not the current mode stored in the RAM 222 is “set” and, if the current mode is “set” indicating a security state, sends the controller 5 side as an abnormality occurrence If the status is other than “set”, the controller 5
No information is sent to. If the abnormality detected by the detection unit 21 is a fire occurrence or a device abnormality state (for example, a disconnection between the detection unit 21 and the abnormality detector 1), the current mode stored in the RAM 222 is “set”. , "Release", the information is sent to the controller 5 side. In the present embodiment, the method of transmitting the synchronization signal S from the controller 5 has been described. However, a method in which the synchronization signal S can be transmitted from the repeater 3 may be used.
Has clock means. Also, the repeater 3 and the controller 5
May be formed as an integrated unit, and the synchronizing signal S is transmitted from the integrated unit. In addition, radio signals are not limited to weak radio signals,
For example, a signal that can be transmitted wirelessly, such as an ultrasonic wave or an infrared signal, may be used.

〔The invention's effect〕

As can be understood from the above description, according to the present invention, in a wireless security system, a transponder that transmits detection information to a controller in response to a detection signal of an abnormality detector laid at a key point in a security area is a battery driven type. And the consumption of the battery is suppressed to the minimum necessary, so that the battery can be saved. In addition, by synchronizing the controller and the transponder, a predetermined period T ₁
The power of the receiving unit can be controlled with a shorter standby signal, and an abnormal signal can be sent in near real-time even if an abnormality of the abnormality detector is detected when the standby signal is received, thereby improving security accuracy. . In other words, an abnormality can be detected and displayed as soon as possible by the controller, and the control center 7 that performs centralized management at a remote location can also detect the abnormality promptly, so that the abnormality can be quickly dealt with and the performance of the security system can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a wireless security system according to an embodiment of the present invention, and FIG. 2 is a more detailed view of a part of each component of the security system shown in FIG. FIG. 3 is a block diagram showing the configuration of the control unit 22 of the transponder 2 in which one of the transponders 2a to 2m of FIG. 1 is typically shown in FIG. 2, and FIG. 4 (a) to 4 (e) are waveform diagrams showing the form and timing of each of the pulsed power signal P, synchronization signal S and standby signal R, and FIG. 5 is a flowchart for explaining the operation. 1 ... Abnormality detector, 2 ... Transponder, 3 ... Repeater, 5 ... Controller, 26 ... Battery power, 23 ...
... Sending unit, 24 ... Receiving unit, 220 ... CPU, 227 ... Synchronization counter, 228 ... Timer.

────────────────────────────────────────────────── (5) References JP-A-59-98298 (JP, A) JP-A-59-2198 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G08B 25/10

Claims (2)

(57) [Claims] At least one or more abnormality detectors laid at important points in a security area, a transponder for transmitting a detection signal connected to the abnormality detector, and wirelessly transmitting and receiving signals to and from the transponder. In the wireless security system having a controller that performs the operation, the transponder (2) supplies a power from the battery power supply (26) only when a detection signal is transmitted to the controller (5). A receiving unit (24) for receiving a power pulse from the battery power source (26) at predetermined intervals (T ₁ ); and a synchronization signal S generated by the controller (5). When the signal is received by the receiving section (24), the reception timing is synchronized with the supply start timing of the power pulse at the constant period (T ₁ ) to start the system. And synchronization means for forming a raised state (227), said system said predetermined period (T ₁₎ shorter than the signal width rising state the controller after the formation of (5) is sent prior to the security mode signals originating (T ₃₎ Control means (22) for continuing the power supply to the receiving unit (24) for a predetermined time (t ₂ ) upon receiving the standby signal R having
0), and the standby signal R having a signal width (T ₃ ) shorter than the fixed period (T ₁ ) and the subsequent security mode signal can be set to the security mode to immediately transmit the detection signal. A wireless security system characterized by: 2. The signal width (T ₂ ) of the synchronization signal generated by the controller (5) at the time of starting the system is selected to be slightly longer than a certain time period (T ₁ ) of the power pulse supply. The wireless security system as described.