JP2664402B2 - Security device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security device having a device for checking the capacity of a battery used as a backup for a DC power supply, and particularly to a security device provided with a commercial power supply. The present invention relates to a security device including a battery check device that allows a user to make a check when the battery is in a state where the battery is in a state where the battery is in a state where the battery is checked.

2. Description of the Related Art There are known many devices configured to generate a direct current from an AC power source such as a commercial frequency power source and operate an electronic circuit or the like with the direct current. In addition, even if the AC power is not supplied due to a momentary power failure or power failure, the electronic circuit continues to operate, or the DC power is backed up so that at least data in the random access memory (RAM) is not lost due to the power failure. Battery backup schemes are also well known.

The battery backup method is of the status quo type that prevents data loss in the RAM, as described above, and is sufficient to still perform all functions even when the AC power is cut off, as in security equipment, for example. There is a type that supplies a direct current. The former generally uses less power and is often backed up by batteries or the like. The latter is required to have reliability, and furthermore, it is necessary to supply the same amount of power as in a normal state until the power failure ends. Therefore, a rechargeable battery (secondary battery) is used as a battery backup.

[Conventional technology]

Even when a battery is used for backup, in a system such as a security system that requires high reliability even during operation by battery supply, monitoring of the battery itself is necessary. That is, it is necessary to check that the backup battery is functioning normally.
Therefore, conventionally, a battery voltage drop detection circuit for detecting that the voltage of the battery is equal to or higher than a certain level is provided.

The battery voltage drop detection circuit monitors the voltage of the battery when the AC power source such as the commercial power supply is cut off and the DC power supply is lost and the battery enters the battery backup state, and when the voltage falls below a certain value. Outputs battery alarm. For example, when the rated voltage is 12 VDC and the operation lower limit voltage of the circuit is 10 VDC, a battery alarm is output when the battery voltage drops to, for example, 10.8 VDC, which is slightly higher than the operation lower limit voltage. Thus, when the battery is discharged in the battery-backed state, a battery alarm is output in advance, so that maintenance personnel can take some remedy.

[Problems to be solved by the invention]

The above-described conventional battery voltage drop detection circuit monitors the discharge state of the battery at the time of battery backup. On the other hand, it does not operate during non-battery backup. In the case of a rechargeable battery, power is supplied from a DC power supply during non-battery backup, and the battery is in a charge standby state. Therefore, especially, the battery is not monitored until the non-backup time.

However, when the battery has failed due to some kind of trouble, or when the connection of the rechargeable battery is disconnected, the battery cannot be operated when the battery should be backed up. Since the conventional battery voltage drop detection circuit is operated by the backup battery as described above, in such a battery backup disabled state, there is a problem that not only the battery voltage drop but also the battery abnormality cannot be detected. is there.

Therefore, for example, there is a problem that a device that is considered to be functioning with a battery backup due to a power failure is not actually operating due to a battery failure, and that it cannot be detected.

Further, the battery check of the security device used in the security system is performed by the user's operation, but there is a problem that the operation is forgotten.

An object of the present invention is to provide a security device that includes a battery check device that can monitor a backup battery on demand even during non-battery backup as well as at the time of battery backup, and that can prevent forgetting to operate the battery check. To provide.

[Means for solving the problem]

To achieve the above object, the present invention provides a security control device and a voltage check device in a security device that is normally driven by an AC power supply and is normally driven by a battery during a power failure. The security control device sets the alert mode and cancels the alert, outputs a setting signal when any of the settings is made, and issues a notification when receiving a signal indicating a battery voltage abnormality. The voltage check device includes a DC monitoring circuit and a disconnection circuit. The DC monitoring circuit monitors whether or not the voltage of the battery is equal to or higher than a predetermined value, and outputs a battery voltage abnormality signal to the security control device when detecting that the voltage is equal to or lower than the predetermined value. The disconnection circuit is energized by the setting signal output from the security control device, and disconnects the AC power from the battery.

(Operation)

Monitoring of the battery at the time of battery backup is the same as in the related art. At the time of battery backup, the AC power supply is cut off, so that power required for monitoring is supplied from the battery itself to be monitored. Therefore, in this case, it is monitored that the power supplied to the monitoring circuit decreases due to the discharge.

At the time of non-battery backup, the disconnection circuit is energized for a predetermined time in conjunction with the setting of the security mode of the security device or the release of the security performed by the user. While the disconnect circuit is energized, the AC power supply is disconnected from the battery and the battery is forcibly monitored. Since the monitoring of the battery is automatically performed in conjunction with the setting of the security mode of the security device or the setting of the security release performed by the user, the battery check is periodically performed. Therefore, when there is an abnormality in the battery, a notification is promptly made and necessary measures are taken, so that the reliability of the security system can be improved.

〔Example〕

First, the technology on which the present invention is based will be described with reference to FIG.

In the figure, the battery check device is a power supply 2
And a voltage check device 1. The power supply device 2 is connected to an AC power supply, for example, a commercial frequency power supply, and provides an instantaneous interruption DC voltage to be supplied to an electronic circuit or the like. The voltage checking device 1 monitors the battery 23 in the power supply device 2. In this embodiment, a rechargeable battery will be described.

The power supply device 2 includes a DC power supply 21, a charging circuit 22, a battery 23,
And the switching circuit 24 is connected as shown. The DC power supply 21 rectifies the AC power to generate a DC of, for example, 12 VDC. In the state shown in the figure, the charging circuit 22 causes the battery 23 to accumulate the electric charge from the DC power supply 21 via the relay contact 122, that is, charge the battery 23. The switching circuit 24 switches the battery 23 as a backup for the DC power supply 21 when the AC power supply or the DC power supply 21 is cut off. Therefore, the output of the DC power supply 21 is output from the switching circuit 24 during normal operation (non-battery backup), and the output from the battery 23 is output from the switching circuit 24 during backup. These DC outputs are supplied to an electronic circuit or the like (not shown). When the AC power supply is normal, the battery 23 is constantly charged.

The voltage check device 1 includes an AC detection circuit 11, a disconnection circuit 1
2. It comprises a switch as a DC monitoring circuit 13 and a trigger circuit 14. The AC detection circuit 11 detects that the AC power supplied to the DC power supply 21 is normal, in other words, detects that the DC power supply 21 is in a state where it can operate normally. The AC detection circuit 11 is a rectifier circuit that inputs AC that is input to the DC power supply 21, and steps down and rectifies it.
111, Photocoupler 11 operated by the output of rectifier circuit 111
2. It comprises a transistor 113. If the AC power supply is normal, the photocoupler 112 operates, and the transistor 113 turns on. The disconnection circuit 12 includes a relay coil 121 and its contact 122
Normally, the relay contact 122 is as shown by the solid line in the drawing, and the DC power supply 21
And the voltages of the DC power supply 21 and the battery 23 are monitored by the DC monitoring circuit 13. As will be described later, when the relay contact 122 is switched as shown by the broken line in the figure, the voltage check of the battery 23 is performed. The DC monitoring circuit 13 checks the voltage of the battery 23 and outputs an alarm if the voltage is below a certain level. The DC monitoring circuit 13 includes transistors 131 and 132, an alarm output relay 133, and a diode.
134, a threshold circuit 135, and resistors 136 to 139 are connected as shown. Here, the resistors 136 and 137 are connected to the battery 23.
Has the function of flowing a large amount of current in order to monitor the voltage value. Threshold circuit 135, the reverse blocking diode 135 ₂ are connected as shown between the zener diode 135 _1. The breakdown voltage of the Zener diode 135 ₁ is, for example,
For the rated output of 12VDC, the lower operating voltage limit of the electronic circuit is 10VDC.
Is set in advance to a value that can detect a value of 10.8 VDC at which a voltage drop can be detected. Also threshold circuit
135 and the divided current value of resistors 136 and 137 and transistor 1
It is also possible to configure with 32 rated values.

 Hereinafter, the operation of the apparatus shown in FIG. 1 will be described.

When the AC power supply is normally applied and the rated voltage is output from the DC power supply 21, the trigger circuit 14 is in a state as shown by the solid line in the figure, the relay 12 is deenergized, and the relay contact 122 is in the state shown by the solid line in the figure. In state. Therefore, the battery 23 is charged as described above. Also this charging voltage is relay contact
The signal is input to the DC monitoring circuit 13 via 122. This voltage is applied to the base of transistor 132 via resistor 139, diode 134, and resistor 140, turning transistor 132 on. As a result, the relay 133 is energized and its relay contacts close as shown. Here, the relay contact is used to make “make (close)” in a normal state and “break (open)” in an abnormal state. In this way, when the drive power supply Vcc itself is cut off, the relay contact is automatically turned on. A "break" occurs, and the disconnection of the drive power supply Vcc can be detected.
This drive power supply Vcc is output from the switching circuit 24.

When the AC power supply is cut off due to a power failure or the like, the output of the DC power supply 21 is lost, so that the switching circuit 24 outputs the power of the battery 23. Therefore, the electronic circuit is continuously supplied with electric power, and the circuit in the apparatus shown in FIG. Also in this backup mode, the relay contact 122 remains at the solid line in the figure. However,
In this case, since the output of the DC power supply 21 is 0,
The output of 23 continues to turn on transistor 132 via resistor 139, diode 134 and resistor 140. This keeps the relay 133 energized.

Next, a case where the battery 23 is forcibly checked will be described. In this case, the trigger circuit 14 is activated for a time sufficient for the relay 12 and the DC monitoring circuit 13 to operate, for example, 500 ms.
Only, it is closed as shown by the broken line in the figure.

If the AC input is normal, the AC detection circuit 11 keeps turning on the transistor 113. Therefore, when the trigger circuit 14 connected to the collector of the transistor 113 is closed, the relay 12 is energized. As a result, the relay contact 122 becomes as shown by the broken line in the figure. Therefore, the battery 23 is applied to the DC monitoring circuit 13 via the relay contact 122. The output of battery 23 turns on transistor 131 via resistor 138 to bypass the voltage from resistor 139. On the other hand, the output of the battery 23 is
The voltage is divided by 137, and the terminal voltage of the resistor 137 is
Applied to 5. If the terminal voltage is equal to or higher than the threshold value of the threshold circuit 135, the transistor 132 is turned on and the relay 133 is kept energized. If battery 23 has failed and transistor 132 is turned off, relay 133 is de-energized. In this case, since the AC power supply is normal, it is understood that the deenergization of the relay 133 is a failure of the battery 23. In this way, the operation of the battery 23 can be checked even when the AC power supply is normal.
Therefore, in a normal state, it is possible to detect a defect of the battery 23 in advance and take appropriate processing.

The trigger circuit 14 can be activated on demand or periodically, such as once a day.

 An embodiment of the present invention will be described with reference to FIG.

FIG. 2 illustrates a security device having a battery check device. In FIG. 2, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted. 2, a security control device 3 including a mode setting device 32 and a control circuit 31 is added to FIG. Also, a clock circuit is provided in the voltage checking device 1 '.
15 and an AC detection circuit 11 'and a disconnection circuit 12'.
Has changed a little. Referring to the AC detection circuit 11 ', a transistor 114, a capacitor 115, and a resistor 116 are added, and in FIG. 1, the open collector output of the transistor 113 drives the relay 121. Clock circuit 1 with emitter output
The timers 151 and 152 in 5 are driven. Also,
The disconnection circuit 12 'is configured such that the relay coil 121 is energized by the transistor 123 which is turned on by the output of the timer 152. Further, the alarm output of the relay 133 is input to the control circuit 31.

When the AC power supply is normal and the backup operation is the first
This is the same as that described with reference to the drawings.

For example, when the user leaves the security target area, the mode is set to the “security mode” via the mode setting device 32. The user will now exit. The control circuit 31 checks the state of various sensors such as an intrusion sensor according to the alert mode setting. As a result of the check, when it is confirmed that there is no unguarded state in all the guarded areas, a guard mode signal is sent to the security center via a communication line (not shown) and the timer 151 is operated. The time of the timer 151 is, for example, 5 minutes. When timer 151 expires, timer 152
Outputs a timed pulse for a fixed time, for example, 500 ms. This time is the same as that of the trigger circuit 14 in FIG. As a result, the relay coil 121 is energized for 500 ms and the relay contact
122 is switched as shown by the broken line in the figure, and the battery 23 is checked.

If the battery 23 is defective and a break output is output from the relay 133, the control circuit 31 reports this alarm state to the security center. The guard can take appropriate action in response to this notification.

In FIG. 2, when the AC power supply is normal, the DC power supply is used to check the battery, and the DC power supply is used to notify the security center. Therefore, the correct state of the battery can always be confirmed after entering the alert mode. In particular, the battery check is automatically performed in association with the mode setting, and the result is reported to the security center.

In the present invention, any battery may be used. Further, the timer 151 may be operated when the “alert release” operation is performed by the mode setting device 32.

According to the embodiment described above, the monitoring of the battery is automatically performed in conjunction with the setting of the alert mode or the alert release of the security device always performed by the user,
Battery checks are performed periodically, which improves the reliability of the security system.

〔The invention's effect〕

As described above, according to the present invention, the security device can check the status of the backup battery upon request, not only during battery backup but also during normal operation. Since the battery check is automatically performed in conjunction with the alert mode setting or alert release setting which is always performed by the user, the battery check is periodically performed, thereby improving the reliability of the security system. Can be.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a battery check device for explaining the technology underlying the present invention, and FIG. 2 is a circuit diagram of a security device according to an embodiment of the present invention. (Explanation of reference numerals) 1 ... voltage check device, 2 ... power supply device, 3 ... security control device, 11 ... AC detection circuit, 12 ... disconnection circuit, 13 ... DC monitoring circuit, 14 ... trigger Circuit, 15 clock circuit, 21 DC power supply, 22 charging circuit, 23 rechargeable battery, 24 switching circuit, 31 control circuit, 32 mode setting device.

Claims (2)

(57) [Claims] 1. A security device which is normally driven by an AC power supply and is driven by a battery when a power failure occurs, wherein a security mode is set and a security release is set. A security control device that outputs a setting signal and issues a notification when a signal indicating an abnormal voltage of the battery is received, and monitors whether the voltage of the battery is equal to or higher than a predetermined value and detects that the voltage is equal to or lower than a predetermined value. Then, a DC monitoring circuit that outputs a battery voltage abnormality signal to the security control device, and a disconnection circuit that disconnects the AC power supply from the battery when activated by a setting signal output from the security control device. A security device comprising a voltage check device. 2. A timing circuit, which is provided between the security control device and the disconnection circuit, and activates the disconnection circuit after a lapse of a predetermined time when a setting signal is received from the security control device. The security device according to claim 1.