JPH09120496A - Stand-by power source testing device for fire monitoring control panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely warn an abnormal voltage drop in a stand-by power source test at battery exhaustion time. SOLUTION: If a source voltage drops into the range below the lowest operating voltage Vr2 of a watchdog timer 34 and above the lowest operating voltage Vr1 of an MPU 6 (Vr2>Vr1) when a dummy resistance R16 is connected to a battery 20, the watchdog timer 34 resets an MPU 6 to disconnect the dummy resistance R1 from the battery 20, and as the MPU 6 is reset, a port signal E6 is outputted to make a buzzer 36 sound once. At the same time, the power source recovers by the disconnection of the dummy resistance 16 and the watchdog timer 34 operates again; and the dummy resistance R16 is connected to the battery 20 again under the stand-by power source control of the MPU 6 to lower the source voltage, and this operation is repeated to make the buzzer 36 sound intermittently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup power supply tester for a fire monitoring control panel for testing whether or not a backup power supply is functioning normally. The present invention relates to a standby power supply test device for a fire monitoring and control panel that detects and warns when the power supply voltage drops to a state.

[0002]

2. Description of the Related Art Conventionally, in a disaster prevention monitoring system using a fire monitoring control panel (receiver) that receives a detection signal from a fire detector to warn of a fire, the power source of the receiver that operates from a commercial power source is used. The circuit is equipped with a backup power source that uses a battery to back up when the commercial AC power source fails.

In a normal monitoring state, the battery of the standby power source is charged with the DC voltage obtained by rectifying and smoothing the commercial AC power source, but during long-term use, Since there is a risk that the charging capacity will become insufficient due to deterioration of the battery and other abnormalities will occur, it is possible to test the standby power supply regularly and as needed. The preliminary power supply test is
This can be done by operating the standby power supply test switch provided on the fire monitoring and control panel. For example, when a push button type non-lock switch is used for the standby power supply test switch, the standby power supply test is performed while the switch is pressed and turned on, and the standby power supply test is terminated when the switch is released and turned off. I have to.

During the standby power supply test while operating the standby power supply test switch, the supply of the direct current power source based on the commercial AC power source is switched to the supply of the standby power source, and at the same time, a dummy resistor for discharging is connected to the standby power source to cause a fire. The same current consumption as during the reception operation by reception is passed to discharge the battery. In this state, the supply voltage of the standby power supply is determined, and normality, abnormality, insufficient remaining battery level, etc. are determined and the result is displayed.

[0005]

However, in such a conventional standby power supply test device for a fire monitoring and control panel, when a nickel cadmium battery is used as the battery of the standby power supply, the residual charge of the battery is reduced. If the dummy power supply is tested by connecting the dummy resistance in a state where the dummy resistance has almost disappeared, the battery voltage, which is, for example, 24V which is the specified value before the dummy resistance is connected, instantly drops to a low voltage of 2-3V.

At such a low voltage of 2 to 3 V, various circuits for a standby power source test operating at a power source of at least 5 V cannot operate normally, and a standby power source lamp using LEDs is also a standby power source test result lamp. Also does not light up, and it is almost the same as when the battery is not connected. Therefore, the test function of the standby power source is substantially lost, and no alarm or display is given, so that there is a problem that it is not possible to determine whether the abnormality is caused by the exhaustion of the battery or the battery is not connected.

The present invention is a backup of a fire monitoring and control panel, which is capable of reliably issuing an alarm for an abnormal voltage drop in a standby power supply test when a battery is exhausted, even if a voltage of 2 to 3 V dropped by connecting a dummy load when the battery is exhausted. An object is to provide a power supply test device.

[0008]

To achieve this object, the present invention is constructed as follows. First, the present invention switches the supply of the DC power supply voltage based on the commercial AC power supply to the supply of the DC power supply voltage by the backup power supply while operating the backup power supply test switch, and connects a dummy load to the backup power supply for testing. The target is the standby power supply test equipment for the fire monitoring and control panel.

With respect to such a standby power supply test apparatus, the present invention connects a watch docked timer to the MPU, and further,
Connect the port output when the MPU is reset by the watchdog timer to the alarm circuit. That is, the MPU has a predetermined first minimum operating voltage Vr1, for example, Vr1 = 2 to 3V, and executes the standby power supply test for connecting the dummy load to the standby power supply based on the operation of the standby power supply test switch.

The watchdog timer is the first MPU.
A predetermined second minimum operating voltage V higher than the minimum operating voltage Vr1
With r2, for example Vr2 = 3.7V. And MP
Re-triggered by receiving a soft timer output for every predetermined first time T1 by the U software timer, the first time T1
A reset signal is output to the CPU when it is desired to obtain the soft timer output even when the predetermined second time T2 that exceeds the time T2 is reached. Furthermore, when the power supply voltage is equal to or lower than the first minimum operating voltage, the watch docked timer stops operating and is fixed to the output state of the reset signal.

The alarm circuit warns of a standby power supply abnormality by a port signal output from the MPU when the watchdog timer resets the MPU. This alarm circuit is M
A circuit that sounds the buzzer in response to the PU port signal. According to the configuration of the MPU, the watchdog timer, and the alarm circuit, when the dummy resistor is connected to the standby power supply, the power supply voltage is Vr2 which is equal to or lower than the second lowest operating voltage of the watchdog timer, and the first lowest value of the MPU. Operating voltage Vr1
When the voltage falls to the above range, the dummy load is disconnected from the standby power supply by resetting the MPU by the watchdog timer.

With the reset operation of the MPU, a port signal is output to the alarm circuit and the buzzer sounds once. At the same time, the power supply voltage is restored by disconnecting the dummy resistor, the watchdog timer operates again, the dummy load is connected to the standby power supply again by the backup power supply control of the MPU, the power supply voltage is dropped, and this is repeated, The buzzer sounds intermittently.

Therefore, it is possible to reliably warn of an abnormal voltage drop in the standby power supply test when the battery is exhausted and to detect the battery exhaustion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a fire alarm system equipped with a fire monitoring and control panel to which the standby power supply test apparatus of the present invention is applied. In FIG. 1, from the fire monitoring and control panel 1, sensor lines 2-1 to 2-n functioning as signal lines that also serve as power sources.
Is pulled out. A plurality of fire detectors 3 are connected to each of the detector lines 2-1 to 2-n, and a termination resistor 4 for detecting disconnection is further connected to the end.

The fire monitoring and control panel has sensor lines 2-1 to 2-1.
Receiving circuits 5-1 to 5-n are provided corresponding to 2-n. The receiving circuits 5-1 to 5-n are connected to the sensor lines 2-1 to 2-1.
The fire detector 3 connected to 2-n detects a fire and short-circuits the lines to a low impedance to detect an increase in current flowing and outputs a fire reception signal. Each of the reception circuits 5-1 to 5-n is an M that constitutes a reception control unit.
It is connected to PU6.

To the MPU 6, an operation unit 7, a display unit 8, a main audio device 9, a district audio drive unit 10, and a transfer circuit 31 are connected. A bell line 11 is drawn out from the district sound driving unit 10 to connect the district bell 12. MP
When U6 receives a fire reception signal from any of the receiving circuits 5-1 to 5-n and determines that it is a fire, it displays a representative fire on the display unit 8 and connects the fire detector 3 that detects the fire. A fire district display showing the sensor line is displayed.

At the same time, the main acoustic device 9 is driven to issue a fire alarm. Further, the district sound drive unit 10 is driven, and the district bell 12 is rung by supplying a drive voltage to the bell wire 11. The ringing of the district bell 12 by the district sound drive unit 10 is performed by the operation unit 7.
Depending on the operating state of the district bell stop switch provided in, ringing or ringing is performed. Further, the MPU 6 outputs a transfer signal for displaying a transfer to the transfer circuit 31. An external display unit is connected to the transfer circuit 31 as needed, and a fire alarm can be displayed even on an external display unit installed separately from the fire monitoring control panel 1.

The fire monitoring and control panel 1 is provided with a power supply unit 13 which receives commercial AC 100 V and receives circuits 5-1 to 5-1.
5-n, D for 24V driving parts such as district acoustic driving part 10
Supply the power supply voltage of C24V. Further, since the MPU 6 and the display unit 8 and the like have circuit units that operate with a 10V power supply or a 5V power supply, these circuit units have DC 10V and D
Supplying C5V. In addition, DC for 30V drive
Supply 30V.

As will be described later, the power supply unit 13 is provided with a battery as a backup power supply, and is switched to the backup power supply so that backup can be performed when the commercial AC 100V is interrupted. The backup power supply test apparatus of the present invention is provided for this backup power supply, and the backup power supply test control unit 27 realized by program control is provided in the MPU 6 accordingly.

Further, the operation unit 7 has a standby power supply test switch 2
5 are provided. The standby power supply test switch 25 is, for example, a push-button switch having a non-lock structure, performs a backup power supply test while the switch is pressed, and terminates the backup power supply test when the switch is released. Further, in the present invention, the watchdog timer 34 is provided as an external circuit of the MPU 6. Corresponding to the watch docked timer 34, MPU6
A software timer 35 realized by program control is provided therein. Watch docked timer 34
Has a function of monitoring an abnormality in program control by the MPU 6.

That is, when the MPU 6 is operating normally, the software timer 35 produces a soft timer output to the watch docked timer 34 every predetermined first time T1. The watchdog timer 34 has a second time T2 slightly longer than the first time T1 of the software timer 35.
Is set and the soft timer output signal E5 from the software timer 35 is retriggered each time it is received, and during the retriggering, the timer output signal E4 to the MPU 6 is maintained at the L level which is in the reset release state.

When an abnormality occurs due to a runaway of the MPU 6 or the like, the function of the software timer 35 is lost and the soft timer output signal E5 cannot be obtained every first time T1. Therefore, the watchdog timer 34 sets the timer output signal E4 to the H level and forcibly resets the MPU 6 when the second time T2 is reached. When the MPU 6 receives the reset by the H level of the timer output signal E4 from the watch docked timer 34, it performs an initial reset as well as when the power is turned on, and at the same time, outputs a port signal E6 from a predetermined port to the outside. In the present invention, the port signal E6 output when the watchdog timer 34 resets the MPU 6 is used as the main audio device 9
The buzzer 37 provided at is connected so as to ring.

MP having this software timer 35
U6, Watchdog timer 34 externally connected to MPU6, and MPU6 by watchdog timer 34
By connecting the buzzer 37 driven by the port signal output at the time of resetting, in the standby power supply test apparatus of the present invention, the standby power supply has a power supply voltage of 2 to 3 V due to battery exhaustion during the backup power supply test. When the voltage drops to an untestable low voltage, an intermittent ringing of the buzzer 37 can alert the battery abnormality.

FIG. 2 is a circuit diagram showing an embodiment of the standby power supply test apparatus of the present invention provided on the fire monitoring control board 1 of FIG. 1 together with the power supply section. In FIG. 2, a commercial AC 100V is supplied to the primary winding 14a of the transformer 14 via a fuse FS1. The transformer 14 includes a primary winding 14a and a secondary winding 14b, and 24V AC is output to the secondary winding 14b. Following the transformer 14, a rectifying / smoothing circuit 15 is provided as a DC power supply circuit.

The rectifying / smoothing circuit 15 rectifies AC24V of the secondary winding 14b of the transformer 14 by the diode bridge 15a through the fuse FS2 and smoothes it by the capacitor C1 to obtain a DC voltage of about 30V. Rectifying and smoothing circuit 15
Is output to the load side as DC24V through the fuse FS3, the diode D6, and the 24V constant voltage circuit 24. DC30 from the output side of the diode D6
V is taken out.

On the other hand, a charging circuit 19 on the lower side is branched and connected from the rectifying / smoothing circuit 15, and the charging circuit 19 has a current limiting resistor R8 and a rectifying diode D5. Charging circuit 19
Is connected to the battery 20 as a standby power source via the fuse FS4. In the present invention, the battery as the standby power source is supplied by the rectifying / smoothing circuit 15
A battery voltage of DC12V that is half that of C24V is supplied.

The power supply switching circuit 16 switches between the power supply by the rectifying / smoothing circuit 15 and the power supply by the battery 20. The power supply switching circuit 16 is a Zener diode ZD1.
A decrease in the output voltage of the rectifying / smoothing circuit 15 is detected by a series circuit of the resistor R4 and the resistor R4. For example, the Zener diode Z is turned on so that the output voltage of the rectifying / smoothing circuit 15 is 12 V or more.
Select the Zener voltage of D1 and use this to select the resistor R4
Therefore, when the zener diode ZD1 is turned off when the voltage falls below a specified voltage of about 17V, a decrease in the output voltage of the rectifying / smoothing circuit 15, and a power failure of commercial AC100V is actually detected.

The connection point between the Zener diode ZD1 and the resistor R4 is connected to the transistor Q1 via the resistors R5 and R6.
Connected to the base. The transistor Q1 has a collector connected to the relay 18. If the output voltage of the rectifying / smoothing circuit 15 is 17 V or higher and normal, the Zener diode Z
Due to the conduction of D1, the transistor Q1 receives the base bias and is turned on to drive the relay 18. Relay 18
Has switching relay contacts 18a and 18b.

The switching relay contact 18a is provided on the battery 20 side, and the switching relay contact 18b is a 10V constant voltage circuit 2
It is provided on two sides. The collector of the transistor Q1 is connected to the LED in parallel with the relay 18 via a resistor R36.
AC power supply lamp 17 using is connected. AC power supply light 17
Is turned on by turning on the transistor Q1 when the output voltage of the rectifying / smoothing circuit 15 is normal at 17 V or higher, and the commercial AC10
Display that 0V is normally obtained.

Further, in the power supply switching circuit 16, the transistor Q2 is connected in parallel between the base and the emitter of the transistor Q1 via the resistor R6. The base of the transistor Q2 is connected to the MPU 6 via the resistor R7. The MPU 6 outputs the control signal E1 by the standby power supply test control unit 27 to turn on the transistor Q2 from the detection of the ON operation of the standby power supply test switch 25 to the detection of the OFF operation, and the relay by turning off the transistor Q1. When the operation of 18 is stopped, switching to the standby power source is performed.

In order to monitor the power supply voltage necessary for the power supply switching control unit 26 provided in the MPU 6, a series circuit of resistors R1 and R3 is provided following the capacitor C1 of the rectifying / smoothing circuit 15, and the divided voltage E2 is connected to the resistor C1. It is input to MPU6 via R2. A booster circuit 21 is connected to the battery 20 provided as a standby power source. A DC-DC converter is used as the booster circuit 21. The + side of the battery 20 is connected to the input of the booster circuit 21 via the switching relay contact 18a of the relay 18 provided in the power supply switching circuit. When the commercial AC 100V is normal, the switching relay contact 18a is switched to the b side by the operation of the relay 18, but when the commercial AC 100V is in a power failure, the relay 18 is deactivated and the switching relay contact 18a is switched to the illustrated side a.

Therefore, the DC 12V of the battery 20 is input to the booster circuit 21, and the booster circuit 21 inputs the input 12V to about 30V.
Boosts to V and outputs. The output of the booster circuit 21 is connected to the cathode side of the diode D6 via the diode D7. Therefore, the diodes D6 and D7 form a diode OR that switches between the power supply voltage of the rectifying / smoothing circuit 15 and the backup power supply voltage from the booster circuit 21.

To the output line of the booster circuit 21, a standby power supply lamp 28 using an LED is connected via a resistor R9. In the standby power supply lamp 28, the switching relay contact 18a is switched to the a side as illustrated by the non-operation of the relay 18 by the power supply switching circuit 16, and the booster circuit 21 outputs a boosted voltage of about 30V in response to the voltage supply from the battery 20. Then, it lights up, indicating that the standby power is being supplied normally.

The output side of the 24V constant voltage circuit 24 has 10V.
A constant voltage circuit 22 and a 5V constant voltage circuit 23 are provided. 1
The 0V constant voltage circuit 22 supplies DC 10V to the 10V drive circuit such as the display unit 8 in FIG. 5V constant voltage circuit 23
5V including MPU6 and watchdog timer 34
DC5V is supplied to the circuit which operates at. 24V DC branched from the 24V constant voltage circuit 24 is supplied to the 10V constant voltage circuit 22 through the b side of the switching relay contact 18b. That is, when the commercial AC 100V is normally obtained, the switching relay contact 18b is closed to the side b by the operation of the relay 18, DC 24V is input to the 10V constant voltage circuit 22, and this is stepped down to generate DC 10V.
The output of the 10V constant voltage circuit 22 is further the 5V constant voltage circuit 23.
Is supplied to DC5V by reducing the input DC10V to 5V.
Is output.

DC 12V from the battery 20 is directly supplied to the side a of the switching relay contact 18b provided on the input side of the 10V constant voltage circuit 22, instead of DC 30V boosted by the booster circuit 21. Next, the corresponding circuit portion of the standby power supply test apparatus of the present invention in the power supply device of FIG. 2 will be described. First M
A standby power supply test switch 25 is connected to PU6. The standby power supply test switch is, for example, a non-lock type push button switch, and is turned on while the switch is being pressed. During this time, the standby power supply test control unit 27 of the MPU 6 operates to perform the standby power supply test.

A backup power supply test circuit 32 is provided for the test operation by the backup power supply test controller 27. The standby power supply test circuit 32 applies the test signal E3 from the MPU 6 to the resistor R14.
Has a transistor Q3 supplied to the base via a transistor Q3, and the collector of the transistor Q3 is connected to the base of the transistor Q4 via a resistor R15.
A dummy resistor R16 for discharging, which allows a load current to flow in the preliminary power supply test, is connected to the collector of the.

The emitter of the transistor Q4 is the booster circuit 2.
1 output. Therefore, the backup power supply test circuit 32 causes a DC 30V output obtained by boosting the DC 12V output from the battery 20 by the booster circuit 21 to flow through the dummy resistor R16 to perform a test operation of the entire standby power supply including the battery 20 and the booster circuit 21. . Of course, as another embodiment, the collector of the transistor Q4 of the standby power supply test circuit 32 is directly connected to the + side of the battery 20,
You may make it carry out the standby power supply test of only 0. Further M
A backup power supply test result lamp 29 using an LED is connected to the PU 6.

The voltage monitoring by the MPU 6 during the standby power supply test is the output voltage of the battery 20 on the input side of the booster circuit 21 obtained via the switching relay contact 18a. Therefore, the MPU is branched from the input of the booster circuit 21.
6 to the voltage signal E7. The test operation of the standby power supply test control unit 27 provided in the MPU 6 when the standby power supply test switch 25 is turned on is such that when the ON operation of the standby power supply test switch 25 is detected, the MPU 6 first switches the power supply switching signal E1. Transistor Q2 of circuit 16
To turn on. As a result, the transistor Q1 is forcibly cut off, the relay 18 is deactivated, and a pseudo AC100V power failure state is created in which the switching relay contacts 18a and 18b are switched to the illustrated side a.

Then, the test signal E3 is output to the standby power supply test circuit 32 to turn on the transistor Q3, the transistor Q3 is turned on to further turn on the transistor Q4, and the dummy resistor R16 is connected to the output of the booster circuit 21. ,
A load current for the standby power supply test is supplied by connecting a pseudo load. At this time, DC30V is also supplied to the receiving circuit section side via the diode D7, so that the load current due to the connection of the dummy resistor R16 flows in addition to the power supply to the normal load. Battery 2 under test by operation of standby power supply test circuit 32 based on test signal E3
The output voltage of 0 is branched from the input side of the booster circuit 21,
The voltage signal E7 is fetched by the MPU 6 and it is determined whether or not the predetermined voltage, that is, the voltage of the battery 20 is within the normal range in which it can effectively operate.

The voltage judgment in this preliminary power supply test is normal if, for example, 10.2 V or more, less than 10.2 V 7.
If it is 0 V or more, it is determined to be abnormal, and if it is less than 7.0 V, it is determined that the remaining amount of the battery 20 is insufficient. The standby power supply test result lamp 29 is controlled according to the result of the voltage determination at the time of this test. For example, the standby power supply test result lamp 29 lights up when normal, goes off when abnormal, and blinks when the battery level is insufficient.

The result display by the control of the standby power supply test result lamp 29 during the standby power supply test is possible when the power source voltage which can drive the standby power supply test result lamp 29 using the LED is obtained. Become. However, battery 2
When 0 is consumed and the remaining amount is extremely low, the battery voltage of the battery 20 sharply drops to 2 to 3 V due to the load current flowing during the standby power supply test. At such a low battery voltage, the LED is used. The display control by the standby power supply test result lamp 29 becomes impossible.

Therefore, in the backup power supply test apparatus of the present invention, the watchdog timer 34 is connected as an external circuit of the MPU 6, and with the connection of the watchdog timer 34, the software timer realized by the program control of the MPU 6. 35 are provided. The circuit unit of the MPU 6 provided with the software timer 35 and the watch docked timer 34 provided as an external circuit is as shown in FIG.

Further, M by the watchdog timer 34
When the PU 6 is reset, the port signal E6 output from a specific port is supplied to the buzzer drive circuit 36, and the buzzer drive circuit 36 causes the buzzer 37 to ring by this port signal E6. FIG. 3 is a time chart showing the operations of the software timer 35 and the watch docked timer 34 of the MPU 6 from the time when the power is turned on when the power supply voltage is normally obtained. Now, at time t0 in FIG.
If the power is turned on at, the DC5V for the MPU 6 and the watch docked timer 34 rises according to the time constant of the power supply circuit, and stabilizes at DC5V after a fixed time.

The minimum operating voltage (first minimum operating voltage) Vr1 of the MPU 6 is about Vr1 = 2 to 3V. On the other hand, the minimum operating voltage (second minimum operating voltage) Vr2 of the watchdog timer 34 is slightly higher than the minimum operating voltage Vr1 of the MPU 6, Vr2 = 3 to 4V, for example Vr2.
= 3.7V. Therefore, with respect to the rise of the power supply voltage after the power is turned on at time t0, first, at time t1 when the power supply voltage reaches the minimum operating voltage Vr1, the MPU 6 is in the operating state as shown in FIG. When the voltage reaches the minimum operating voltage Vr2 at time t2, the watchdog timer 34 enters the operating state and starts the timer operation as shown in FIG.

When the power output rises, the timer output E4 of the watch docked timer 34 rises to the H level, and the MPU 6 is initially reset. At this point, the operation of the software timer 35 shown in FIG. 3C is started. The software timer 35 outputs the software timer output signal E5 every time it counts the predetermined first time T1.

This software timer output signal E5 is
It is supplied as a reset signal to the watchdog timer 34, and in response to this, the watchdog timer 34 performs a retrigger operation. That is, as shown in FIG. 3B, the watchdog timer 34 sets a predetermined second time T2 slightly longer than the first time T1 of the software timer 35, and the software timer 35 is set before the second time T2 is reached. 35
Since the software timer output signal E5 is output, the timer operation is repeated without the time up.

When an abnormality such as a runaway occurs in the MPU 6 during the normal operation of the cooperative operation of the software timer 35 and the watchdog docked timer 34, the function of the software timer 35 is lost and the watchdog docked even after the lapse of the first time T1. Software timer output signal E5
Will not be output. Therefore, the watchdog timer 34 sets the timer output signal E4 to the L level and forcibly resets the MPU 6 when the second time T2 has elapsed,
Restores the MPU 6 that has runaway to a normal state.

Although the circuit operation by the software timer 35 of the MPU 6 and the watchdog timer 34 as an external circuit is well known, the present invention effectively uses the functions of these circuit parts to make a backup. When the voltage of the battery 20 is extremely reduced to 2 to 3 V due to the battery consumption during the power supply test, a battery consumption abnormality alarm is issued.

The time chart of FIG. 4 shows the operation when the power supply voltage of the battery 20 drops extremely in the standby power supply test. It is assumed that the standby power supply test switch 25 is operated at time t1 in FIG. 4A to perform the standby power supply test.
At the time of this standby power source test, the relay 18 of the power source switching circuit 16 is in a non-operating state, so that the switching relay contact 1
8a and 18b are closed to the a side and switched to the power supply from the battery 20, and at the same time, the dummy resistor R16 is connected to the output side of the booster circuit 21 by the operation of the standby power supply test circuit 32.

However, the remaining amount of the battery 20 is extremely small, and the battery voltage is equal to or lower than the minimum operating voltage Vr2 of the watch docked timer 34 due to the supply of the load current from the battery 20 at the time of switching the standby power supply and is the minimum of the MPU 6. It is assumed that the voltage drops to a level of 2 to 3 V, which is equal to or higher than the operating voltage Vr1. When the power supply voltage reaches P2 from P1 and falls below the minimum operating voltage Vr2 in the process of voltage drop accompanying the standby power supply test at time t1, the operation of the watchdog timer 34 is stopped as shown in FIG. 4B. , The timer output signal E4 to the MPU 6 falls to the L level state instructing the reset and is fixed.

As the timer output signal E4 is fixed to the L level when the operation of the watch docked timer 34 is stopped, the MPU 6 is reset by the watch docked timer 34, as shown in FIG. 4 (C). The reset operation of the MPU 6 is performed. The reset operation of the MPU 6 clears all the control of the standby power supply test control unit 27 currently being processed.

For this reason, the relay 18 of the power supply switching circuit is activated, and the switching relay contacts 18a and 18b that have been supplying the current from the battery 20 to the load return to the b side. At the same time, the standby power supply test circuit 32 is also restored, and the dummy resistor R16 is disconnected from the output side of the booster circuit 21. As a result, there is no consumption current from the battery 20, and the voltage of the battery 20 is restored to the same voltage as P3 to P4 in FIG. 4 and the original P1.

When the minimum operating voltage Vr2 is exceeded at P4 in the recovery process of the power supply voltage, the watch docked timer 34 enters the operating state again, and the timer output signal E4 of the watch docked timer 34 is the same as when the power is turned on in FIG. The initial reset is applied to the MPU 6 due to the rise to the H level, the function of the standby power supply test control unit 27 is enabled again, and the standby power supply test state is set again at the time t2, and the voltage of the battery 20 drops again accordingly. Will be done.

The port output signal E6 of the MPU 6 changes to the H level at the timing when the MPU 6 is initially reset by the rise of the timer output signal E4 of the watchdog timer 34 to the H level as shown in FIG. 4D, for example. Then, the pulse output is supplied to the buzzer drive circuit 36. Therefore, the buzzer drive circuit 36 keeps the buzzer 37 in operation during the H level period of the port output signal E6 from the MPU 6.
Sounds like (E). Hereinafter, time t2 to t3, t3
Repeat the same operation for every t4 ...
7 is intermittently sounded to warn that the remaining amount of the battery 20 is extremely low.

Incidentally, in the embodiment of the present invention shown in FIG.
An example is shown in which a battery of 12 V is used as a backup power source and the voltage of the backup power source is supplied by boosting the voltage with a booster circuit 21, but the booster circuit 21 is not provided and the rectifying and smoothing circuit 15 is provided in the battery 20. The standby power supply test apparatus of the present invention can be applied in the same manner even when the same 24V power supply is used. Further, the present invention is not limited by the numerical values shown in the above embodiments.

[0056]

As described above, according to the present invention, even if an extreme voltage drop of 2 to 3 V occurs during the standby power supply test due to battery exhaustion, an abnormal voltage drop due to the battery exhaustion can be ensured. It is possible to warn by the sound of a buzzer, etc. when it is detected, and even if it is not possible to judge by the display of the standby power supply light or the standby power supply test result light etc. Therefore, the reliability of the preliminary power supply test can be further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a disaster prevention monitoring system to which the present invention is applied.

FIG. 2 is a circuit block diagram showing an embodiment of the present invention.

[Fig. 3] Time chart of MPU and watchdog timer when power supply voltage is normal

FIG. 4 is a time chart of alarm operation when the battery voltage abnormally drops in the standby power supply test.

[Explanation of symbols]

 6: Control unit (MPU) 7: Operation unit 8: Display unit 9: Main audio device 13: Power supply unit 16: Power supply switching circuit 18: Relays 18a, 18b: Switching relay contact 20: Battery (spare power supply) 25: Spare power supply Test switch 26: Power supply switching control unit 27: Standby power supply test control unit 28: Standby power supply light 29: Standby power supply test result light 32: Standby power supply test circuit 34: Watch docked timer 35: Software timer 36: Buzzer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Arikawa 2-1043 Kamiosaki, Shinagawa-ku, Tokyo Hochiki Co., Ltd.

Claims (2)

[Claims] 1. While operating the standby power supply test switch,
In the standby power supply test device of the fire monitoring and control panel for switching from the supply of the DC power supply voltage based on the commercial AC power supply to the power supply by the standby power supply, and connecting the dummy load to the standby power supply for testing, M having a minimum operating voltage and performing a test of the backup power supply based on operation of the backup power supply test switch M
PU and a predetermined second minimum operating voltage higher than the first minimum operating voltage of the MPU, retriggered by receiving a soft timer output by the software timer of the MPU for each predetermined first time T1, and A reset signal is output to the CPU when the software timer output is not obtained even when the predetermined second time exceeding the time is reached, and the reset signal is output when the power supply voltage is equal to or lower than the first operating voltage. A fixed watchdog timer and an alarm circuit for warning a standby power supply abnormality by a port signal output from the MPU when the MPU is reset by a reset signal from the watchdog timer are provided, and the standby power supply is provided. When a dummy resistor is connected and the power supply voltage is equal to or lower than the second minimum operating voltage of the watchdog timer, If drops 1 minimum operating voltage higher than the range, MPU by the watchdog de Timer
A standby power supply test device for a fire monitoring and control panel, characterized in that the operation of disconnecting the connection of the dummy load from the standby power supply and recovering the power supply voltage is repeated by resetting the buzzer to intermittently ring the buzzer. 2. The standby power supply testing device for a fire monitoring and control panel according to claim 1, wherein the alarm circuit is a circuit for ringing a buzzer in response to a port signal of the MPU. Backup power test equipment.