JP2004280638A - Security device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent workers staying in a cautionary area which is in a caution state at the time or persons concerned with security properties from being instantly decided as intruders in the case of power restoration after action of a security device halts completely. <P>SOLUTION: When a voltage of a battery 3 falls below a threshold while a commercial power supply is cut off and is having backup power feeding by the battery 3, a control unit 6 writes in a nonvolatile memory 12 data to indicate that the battery 3 has fallen the voltage. After this, the action of the security device 1 completely halts and the commercial power supply is restored, the control unit 6 reads the non-volatile memory 12 and recognizes that the halt of the action is based on the voltage reduction of the battery 3. Then the control unit 6 does not perform security processing during a predetermined action delay time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a security device used in a security system, and more particularly, to a security device that performs power backup using a battery when a commercial power failure occurs.
[0002]
[Prior art]
As is well known, a security device used in a security system is provided with a predetermined security based on a signal from a security status setting device that switches a security status from a security status to a release status or vice versa, a signal from a security sensor, and the like. The processing is executed, and when it is determined that an abnormal situation has occurred, an operation such as notifying a security center device of a security company or activating a threatening device is performed.
[0003]
By the way, the power supply of the security device normally generates and uses a predetermined DC voltage from the commercial power supply. However, since the security device performs the security processing as described above, the security device is also protected even when the commercial power supply fails. In general, a security device has a built-in battery as a backup power supply, and a backup power supply is performed by the battery in the event of a power failure. See Japanese Unexamined Patent Publication No. 10-69592).
[0004]
This allows the security device to continue to operate with the battery even during a power failure, and will resume operation with the commercial power if the commercial power is restored while the battery is supplying backup power.
[0005]
However, it is difficult to cope with a long-term power failure with the backup power supply using a battery, and the security device stops operating if the voltage of the battery decreases during the backup power supply from the battery.
[0006]
Of course, if the power is restored after that, the security device starts the operation again and executes the security processing, but at the start of the operation, the voltage of the battery dropped and the security device stopped operating. It is necessary to maintain the security status at the time. That is, in that case, the security device recognizes that the alert state is set to the alert area where the alert state was set when the battery voltage is reduced and the operation is stopped, and the release state is set. It is necessary to recognize that the guard area has been released, so that the security processing after power recovery can be performed in the state immediately before the security device stops operating. It will be taken over and executed.
[0007]
For this purpose, the security device usually stores the latest security status in the non-volatile memory for each security area and each time the security status is switched by the security status setting device. Regarding the point, see, for example, JP-A-10-269480).
[0008]
By doing so, the security device reads the contents stored in the non-volatile memory when the commercial power is restored and the operation is started after the battery voltage is reduced and the operation is stopped. Thereby, it is possible to recognize whether the current security state of each security area is a security state or a cancellation state.
[0009]
[Patent Document 1] Japanese Patent Application Laid-Open No. 10-69592 [Patent Document 2] Japanese Patent Application Laid-Open No. 10-269480 [0010]
[Problems to be solved by the invention]
By the way, there are various causes of a power outage. In the event of a power outage, on the security property side where the security system is constructed, investigation of the cause of the power outage and work toward power recovery are performed. There are cases.
[0011]
However, conventionally, when the power is restored after the work to investigate the cause of such a power failure or the work for power recovery is completed, the worker who was performing the work is determined to be an intruder and security There has been a problem that a company may be notified of an abnormality or a threatening device may be activated.
[0012]
Specifically, it is as follows. Now, it is assumed that a power failure occurs and the security device operates by the backup power supply from the battery, but before the power is restored, the voltage of the battery decreases, and the security device completely stops operating. Naturally, the possibility of such a situation occurring is conceivable. The security device includes a non-volatile memory, and the non-volatile memory stores the security status of each security area immediately before the security device completely stops operating.
[0013]
In such a case, work to investigate the cause of the power outage or work to restore the power is performed.When the power is restored, the security device starts operating, reads the contents of the nonvolatile memory, and checks the security status of each security area. Recognition and security processing will be performed, but at that time, if workers remain in the security area set to the security state, security sensors installed in the security area, for example, heat rays This is detected by the sensor, and the security device determines that an abnormal situation has occurred.
[0014]
If the power is restored while the security device operates with the battery, the above-mentioned situation does not occur.
[0015]
In view of the above, the present invention provides a security device in which, when the power is restored after the operation of the security device is completely stopped as described above, the worker or a person involved in the security property is not immediately determined to be an intruder. The purpose is to provide.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, a security device according to claim 1 provides a backup power supply by a battery and a battery when a commercial power supply fails, and a power supply unit that supplies power by a commercial power supply in a normal state when there is no power failure. In a security device including at least a nonvolatile memory that stores a security state of an area, and a control unit, the control unit is configured such that a voltage of the battery is equal to or less than a threshold value when a commercial power supply is stopped and backup power is supplied by the battery. In the case where the battery voltage drops to a value, data indicating that the voltage of the battery has dropped is written to the nonvolatile memory.
According to a second aspect of the present invention, in the security device according to the first aspect, the control unit performs a complete operation by reducing the voltage of the battery to a threshold value or less when a commercial power supply fails and the battery supplies backup power. When the commercial power is restored after the stop, based on the data written to the nonvolatile memory and indicating that the voltage of the battery has dropped, security processing is not performed for a predetermined period of time. I do.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of a security device according to the present invention, in which 1 is a security device, 2 is a power supply unit, 3 is a battery, 4 is a power failure detection unit, 5 is a voltage detection unit, Reference numeral 6 denotes a control unit, 7 denotes a sensor input unit, 8 denotes a security state setting unit, 9 denotes a display unit, 11 denotes a line unit, and 12 denotes a nonvolatile memory.
[0018]
An external commercial power supply and a battery 3 are connected to the power supply unit 1. The power supply unit 1 is configured by using a rectifier circuit or a DC-DC converter, and generates a necessary DC voltage from a commercial power supply as a main power supply during normal times, that is, when there is no power failure, and sends the necessary DC voltage to each unit in the security device 1. Power is supplied, and in the event of a commercial power failure, power is supplied from the battery 3 as a backup. In the figure, the power supply lines are indicated by thick solid lines. Although not shown in FIG. 1, it is obvious that the security device 1 may include a unit for charging the battery 3 in a normal state.
[0019]
The power failure detection unit 4 monitors a voltage at a predetermined portion of the power supply unit 2, for example, a voltage directly generated from a commercial power supply such as an output voltage of a rectifier circuit, to detect a power failure and a power recovery of the commercial power supply. When the commercial power supply is detected to be out of power, the power supply unit 2 and the control unit 6 are notified of the power outage. As a result, the power supply unit 2 supplies power from the battery 3, and the control unit 6 recognizes that the power has stopped.
[0020]
Further, upon detecting a power recovery after a power failure, the power failure recovery detecting unit 4 notifies the power supply unit 2 and the control unit 6 that the power has been recovered. As a result, the power supply unit 2 supplies power from the commercial power supply, and the control unit 6 recognizes that power has been restored.
[0021]
The voltage detection unit 5 compares the voltage of the battery 3 with a preset threshold value, and notifies the control unit 6 when the voltage of the battery 3 becomes lower than the threshold value.
[0022]
The control unit 6 is configured by a CPU and its peripheral circuits, and executes a predetermined security process and a process specific to the present invention described later.
[0023]
The sensor input unit 7 is provided with an input channel to which a predetermined number of security sensors are connected, and when receiving a detection signal from a certain security sensor, notifies the control unit 6 of the input channel number that received the detection signal. Thus, the control unit 6 can recognize which input channel of the security sensor outputs the detection signal. It should be noted that various sensors such as a hot-wire sensor for detecting a person's movement and a sensor for detecting that a window is opened can be used as the security sensor.
[0024]
The security state setting unit 8 is for setting the security state of the security area defined for the security property, and by performing a predetermined operation, changes the security state of the specific security area from the security state to the release state. Alternatively, the setting can be switched to the opposite. When the security status of a certain security area is switched, the security status setting unit 8 notifies the control unit 6 of the number of the security area and the security status set this time.
[0025]
As a method for setting the security state in the security state setting unit 8, there are various methods such as a card method using an IC card or a magnetic card, a method of keying in a personal identification number, and the like. The system may be used. Although the security status setting unit 8 is provided integrally with the security device 1 in the figure, the security status setting device is installed near the entrance and exit of each security area and connected to the control unit 6 by a signal line. It is also possible to do so.
[0026]
The display unit 9 is for performing a display for notifying a user of a predetermined matter, and may be for performing an auditory display or a visual display. You may have. Here, it is assumed that an auditory display is performed, and a voice message can be displayed by a speaker using a voice synthesis technique. Since the speech synthesis technique is well known, the description is omitted.
[0027]
The line unit 11 is for reporting to a predetermined device such as a security center device of a security company via a communication line such as a public telephone line.
[0028]
As the nonvolatile memory 12, an EEPROM may be used, but any other appropriate memory may be used.
[0029]
Next, the operation will be described. First, the security processing performed by the control unit 6 is well known, but will be briefly described for convenience of describing the specific operation of the security device 1.
When receiving a notification from the security status setting unit 8 indicating that the security status of a certain security area has been switched from the release status and a new security status has been set, the control unit 6 stores it in the internal memory. At the same time, the security state is written in an area of the nonvolatile memory 12 where the security state of the security area is stored. The same applies to the case where the alert state is switched to the release state.
[0030]
The control unit 6 associates the number of the alert area with the input channel number of the sensor input unit 7, and when notified of the input channel number that has received the detection signal from the sensor input unit 7, the control unit 6 6, the internal memory identifies whether the guard area corresponding to the input channel number is currently in the guard state or in the released state. If the guard area is in the released state, it is not determined that an abnormal situation has occurred. If it is in the state, it is determined that an abnormal situation has occurred, and a notification is made via the line unit 11.
[0031]
The above is the outline of the security processing executed by the security device 1 in the normal state, that is, when the commercial power supply is not stopped.
[0032]
When the commercial power supply fails, the power failure recovery unit 4 detects the power failure, the power supply unit 2 supplies backup power from the battery 3, and the control unit 6 recognizes that the commercial power supply has failed. When the control unit 6 recognizes that the commercial power supply has stopped, the monitoring of the voltage detection unit 5 is started. At this time, the control unit 6 continuously executes the above-described security processing.
[0033]
Thereafter, if the commercial power supply is restored before the voltage detection unit 5 detects that the voltage of the battery 3 has dropped below the threshold, the power failure recovery unit 4 detects that the power has been restored, and the power supply unit 2 The power is supplied from the power supply, and the control unit 6 recognizes that the commercial power supply has been restored. When recognizing that the commercial power has been restored, the control unit 6 stops monitoring the voltage detection unit 5.
[0034]
However, when the control unit 6 receives a notification indicating that the voltage of the battery 3 has dropped below the threshold from the voltage detection unit 5 before receiving the notification that the commercial power has been restored from the power failure detection unit 4, Writes data indicating that the voltage of the battery 3 has dropped in the nonvolatile memory 12. Then, thereafter, if the commercial power remains unrecovered, the security device 1 completely stops operating.
[0035]
When the commercial power is restored after the security device 1 has completely stopped operating, the power failure recovery unit 4 detects that the power has been restored, and the power supply unit 2 supplies power from the commercial power source. Starts the operation, and the control unit 6 recognizes that the commercial power has been restored.
[0036]
Then, as in this case, before the power of the commercial power supply is restored, the voltage of the battery 3 becomes equal to or lower than the predetermined threshold, and after the security device 1 completely stops operating, the commercial power supply is restored and the security device 1 is restored. Is started again, the control unit 6 first reads out the contents of the non-volatile memory 5, expands the security status of each security area in the internal memory, and restarts the security processing. However, at this time, the control unit 6 reads the contents of the non-volatile memory 5 and recognizes that the operation of the security device 1 is completely stopped due to the voltage drop of the battery 3.
[0037]
When recognizing that the cause of the complete stoppage of the operation of the security device 1 is due to the voltage drop of the battery 3, the control unit 6 starts the operation delay process. In the operation delay process, there is a notification from the sensor input unit 7 that a detection signal has been received from a certain input channel number, and the input channel number is the input channel number corresponding to the guard area in the alert state at this time. Even if it is a detection signal from the security sensor, an operation is performed that does not determine that an abnormal situation has occurred. That is, the operation delay processing is an operation in which the security processing is not performed.
[0038]
Also, while performing the operation delay processing, the control unit 6 displays a message on the display unit 9 indicating that the operation delay processing is being performed. Here, since the display unit 9 is assumed to be capable of displaying a voice message by a speaker using a voice synthesis technology, for example, “The operation is currently being delayed. . "May be repeatedly displayed. Thereby, it is possible to notify a person in the vicinity of the security device 1 that the operation delay process is being executed.
[0039]
The operation delay time for performing the operation delay processing is set in the control unit 6 in advance. Then, when the security status setting unit 8 switches the security status of the security area set to the security status to the release status within the operation delay time, the control unit 6 validates the switching of the security status, and The security state of the security area in the internal memory and the nonvolatile memory 12 is rewritten from the security state to the release state. The same applies to the case where the security state of the security area in which the release state is set is switched from the release state to the security state. That is, the operation of the security state setting unit 8 is valid even within the operation delay time.
[0040]
When the operation delay time has elapsed, the control unit 6 starts security processing. Therefore, if a person moves in the alert area in the alert state after the operation delay time has elapsed, the control unit 6 determines that an abnormal situation has occurred, and sends a notification via the line unit 11.
[0041]
In addition, the control unit 6 may read the data indicating that the voltage of the battery 3 has dropped in the nonvolatile memory 12 at an appropriate timing, for example, after the control unit 6 reads the data from the nonvolatile memory 12, Alternatively, a process of deleting after the elapse of the operation delay time is performed.
[0042]
As described above, when the commercial power supply stops and the voltage of the battery 3 drops while the backup power is supplied by the battery 3, the commercial power supply is restored after the security device 1 completely stops operating. In the case where a worker or the like remains in the guard area set in the guard state at that time, the worker can leave the guard area within the operation delay time, or the security state setting unit 8 By switching the guard state of the guard area to the released state, it is possible to avoid that the worker or the like is determined to be an intruder.
[0043]
This operation delay time can be set arbitrarily.However, if it is too short, there is a possibility that an operator or the like may leave the guarded area in a guarded state or may not be able to switch from the guarded state to a released state in time. On the other hand, if it is too long, the time during which the security process is not performed will be long, so that the determination may be made in consideration of these matters.
[0044]
In some cases, the user of the security device 1 intentionally operates the power switch (not shown) to stop the operation of the power supply unit 2. Write nothing. Therefore, if the operation of the security device 1 is stopped by operating the power switch and the power is subsequently turned on, the above-described operation delay processing is not performed. Therefore, if there is a person in a guard area that is in a guard state at that time, it is determined that the person is an intruder.
[Brief description of the drawings]
FIG. 1 is a diagram showing one embodiment of a security device according to the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 security device 2 power supply unit 3 battery 4 power recovery detection unit 5 voltage detection unit 6 control unit 7 sensor input unit 8 security state setting unit 9 display unit , 11 ... line section, 12 ... nonvolatile memory.

Claims (2)

Battery and
A power supply unit that supplies backup power by a battery during a power failure of a commercial power supply, and supplies power by a commercial power supply during a normal time when there is no power failure;
A non-volatile memory for storing the security status of the security area,
In a security device comprising at least a control unit,
The control unit indicates to the nonvolatile memory that the voltage of the battery has dropped if the voltage of the battery drops below a threshold value when the commercial power supply is stopped and backup power is being supplied by the battery. A security device for writing data. When the commercial power supply is restored after the commercial power supply is cut off and the battery voltage is reduced to a threshold or less and the operation is completely stopped when the commercial power supply is stopped and the battery is performing backup power supply, 2. The security device according to claim 1, wherein security processing is not performed for a predetermined time based on data indicating that the voltage of the battery has dropped in the nonvolatile memory.

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