JPH09161167A - Fire sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire sensor with which power consumption is reduced by utilizing the stop state etc. of microcomputer. SOLUTION: Since this fire sensor has a microcomputer IC 1 to be turned into operation stop state by performing a fire detecting operation while using a fire detection part for detecting physical quantity based on the phenomenon of fire and an inverter IC 4 for inputting start to the microcomputer IC 1 by detecting the charge of oscillation circuit B5 as a charging circuit at a prescribed potential to a capacitor C1, the other circuit can be stopped during the period of charging to the capacitor C1 by utilizing the stop state etc. of microcomputer IC 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector that performs a fire detection operation by using a fire detection unit that detects a physical quantity based on a fire phenomenon and sends a fire signal or an analog signal.

[0002]

2. Description of the Related Art Conventionally, when a heat detector is constructed by using a thermistor and a microcomputer as a fire detector, current consumption is increased as compared with a heat detector using a bimetal or an air chamber. As a result, the number of connected sensors is limited, and a large power supply device must be provided in order to install many sensors.

[0003]

Generally, a microcomputer used for a fire detector consumes a current of several hundred μA at the time of calculation called a run state. On the other hand, when the clock of the microcomputer is stopped and the stop state is the memory storage state, the current consumption is several μA, which is a very low consumption state. However, in order to shift from the stop state to the run state, it is necessary to give some kind of signal.For example, if the oscillator circuit is configured with a frequency divider and the necessary trigger time is created, the microcomputer itself will have low current consumption. Also consumes current in the oscillator circuit.

A first invention of the present application aims at obtaining a fire detector of low consumption by utilizing a stop state of a microcomputer.

Further, when the fire monitoring operation is performed by repeating the stop state and the run state of the microcomputer, the stop state and the run state cannot be distinguished when the inspection input is made. At the same time, the inspection operation cannot be performed.

A second object of the present invention is to obtain a fire detector which shifts from a stop state to a run state at the time of inspection input.

Furthermore, when an inspection input is made, it is necessary to artificially determine that a fire has occurred, but if the fire detection section detects heat using a thermistor, it is heated by a heater. It takes a lot of time and it takes time to check. Further, when the fire detection unit detects smoke, there is a problem not only the labor but also the contamination of the detection unit when smoke is added.

It is an object of the third and fourth inventions of the present application to provide a fire detector that can easily perform a pseudo inspection operation.

[0009]

In view of the above points, the first invention of the present application performs a fire detection operation by using a fire detection section for detecting a physical quantity based on a fire phenomenon, and then becomes an operation stop state. It is characterized by comprising a control circuit, a charging circuit, and a starting circuit for detecting charging of a predetermined potential to the charging circuit and performing a starting input to the control circuit.

A second aspect of the present invention is a control circuit that performs a fire detection operation using a fire detection unit that detects a physical quantity based on a fire phenomenon, and then becomes inoperative, and a predetermined control circuit for the control circuit. And a check detection circuit that performs a start input and a check start input to the control circuit based on a check input from the outside, and the control circuit is based on the start input. The fire detection operation is performed, and the inspection operation is performed when the inspection input is input together with the activation input.

Further, according to the third invention of the present application, a capacitor is connected to an impedance circuit including a fire detection element.
It has a control circuit that performs a fire detection operation using a fire detection unit that detects a fire from a value based on the R time constant, and an inspection detection circuit that performs an inspection start input to the control circuit based on an inspection input from the outside. The control circuit is characterized in that, when there is the inspection start input, an inspection impedance circuit is connected to the impedance circuit to perform an inspection operation from a value based on the inspection CR time constant.

Furthermore, a fourth invention of the present application is a fire in which a light-emitting circuit for causing a light-emitting element for fire detection to emit light is activated, and a fire is detected from a value output from a light-receiving element not facing the light-emitting element for fire detection. A control circuit that performs a fire detection operation using the detection unit, and an inspection detection circuit that performs an inspection start input to the control circuit based on an inspection input from the outside,
When the inspection start input is present, the control circuit causes the inspection light emitting element facing the light receiving element to emit light at the same time as the fire detection light emitting element, and a value based on the output of the light receiving element at this time. The inspection operation is performed from the above.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. 1 and 2 are circuit diagrams of a thermistor-type heat detector 4h and a photoelectric smoke detector 4s as specific examples of the fire detector, which are used as the fire detector 4 of the system shown in FIG. .

In FIG. 1, the heat detector 4h has a constant voltage circuit B2 for supplying a stable voltage and current, using the terminals C and L to which the power source / signal lines 2 and 3 are connected as power sources.
And an oscillation circuit B5 for inputting an interrupt to the microcomputer IC1 based on the charging time constant of the resistor R1 and the capacitor C1,
A heat detection circuit B4 for detecting heat from a fire based on the temperature characteristics of the thermistor TH under the control of the microcomputer IC1.
And a reset circuit B3 that performs a reset input when the microcomputer IC1 runs out of control, and a switching circuit B1 that switches between terminals C and L to a low impedance, substantially short-circuited state when the microcomputer IC1 determines that a fire has occurred. Further, an input detection circuit B6 for detecting an input from a terminal GI to which an input side of the output line 7 which is the fire receiver side is connected in order to perform an operation of checking whether or not the sensor is normal,
Terminal G to which the output side of output line 7 is connected after the inspection operation is completed
Short-circuit B7 for progressive output of inspection input to O
And when inputting from the output side terminal GO, input that terminal C
And a discharge circuit B8 for discharging to.

Next, the operation of the heat detector 4h will be described. When the capacitor C1 is charged by the resistor R1 in the constant oscillation circuit B5 and the charging voltage reaches a predetermined potential based on the time constant, the inverter IC4 operates and the microcomputer IC
A signal is sent to the interrupt port INT of 1. The microcomputer IC1 shifts from the stop state to the run state when an interrupt input is input to the port INT, and the port INT
Heat detection is performed when the number of inputs to (1) reaches a specified number (for example, 10 times). When it is not the specified number of times, the microcomputer IC1 sets the port Ps to a low level (ground potential) to discharge the electric charge of the capacitor C1 and enters a stop state as an operation stop state. Here, the stop state is a clock stop state of the microcomputer, which is a very low consumption state of several μA, and a few hundred μA in the run state.
And there is a large current consumption, but it is economical.

When performing heat detection, the port P7 is set to a low level in order to discharge the electric charge of the capacitor C2 charged through the resistor R6 in the heat detection circuit B4 through the resistors R11 and R12 and the thermistor TH. (Ground potential). At this time, the potential of the capacitor C2 is input to the port P6 of the comparator built in the microcomputer IC1 through the resistor R10 and monitored, and the microcomputer IC1 measures the temperature by measuring the discharge time. The reference potential of the comparator built in this microcomputer IC1 is the resistance R7, R
Determined by 8. Although not shown, the thermistor TH is provided so as to project from the sensor body and responds to the ambient temperature of the location where the sensor is installed. The discharge time from the capacitor C2 through the thermistor TH depends on the temperature. The discharge time allows temperature detection. In addition, every several times of this heat detection operation, port P
Instead of setting 7 to the low level, the port P8 is set to the low level so that the electric charge of the capacitor C2 is discharged by the resistor R11
Discharge only, and measure the discharge time that is not affected by temperature. Then, the temperature is detected by taking the ratio of the discharge time including the thermistor TH and the discharge time not including the thermistor TH, so that the temperature measurement in which the variation due to the individual difference of the capacitor C2 is eliminated can be performed.

If the microcomputer IC1 determines that there is a fire on the basis of the measurement result according to the discrimination standard (constant temperature discrimination temperature, differential discrimination temperature rise, etc.) preset in the storage means or the like, , By turning the port Pf to a high level, the transistor Q4 of the switching circuit B1 is turned on to switch between the terminals C and L, and at the same time, the transistor Q3 is turned on to turn on the confirmation lamp by the light emitting diode LED. Between the terminals C and L, there is a polarity so that the terminal C side becomes the ground potential in relation to the inspection function described later, and the diode D1 prevents the influence of the reverse connection to the power supply / signal lines 2 and 3. doing.

At the time of inspection, a voltage is applied to the heat detector 4h via the output line 7 to the terminal GI, which is used as an inspection input. Depending on the voltage of the terminal GI, the transistor Q of the input detection circuit B6
When the transistor Q1 is turned on and the transistor Q1 is turned on accordingly, a signal is sent to the interrupt port INT of the microcomputer IC1. The input to the interrupt port INT is shared with the input from the oscillation circuit B5 via the dual diode D2. Whether the input from the input detection circuit B6 is input or not is determined by the input level to the port P1 which is simultaneously input. Can be distinguished by the high level. That is, the microcomputer IC1 detects that the input level to the port P1 is high when an interrupt input is input to the port INT and transitions from the stop state to the run state, and the interrupt input from the input detection circuit B6 is detected. Then, the inspection operation is started.

Since the check input to the terminal GI via the output line 7 is not always received when the microcomputer IC1 is in the stop state, the level of the port P1 is confirmed at a predetermined timing when the microcomputer IC1 is in the run state. To do. Even during the heat detection operation, the inspection operation is prioritized by the high level detection of the port P1. this is,
This is because it is necessary to output the inspection signal at a predetermined timing in the inspection operation of the system described above.

In the checking operation by the microcomputer IC1, first, in order to quickly charge the capacitor C2 to a predetermined potential, the port P5 is set to a high level and the resistor R6 and the resistor R9 smaller than that are charged. Then, in order to form a pseudo high temperature state, the ports P7 and Pt are simultaneously set to low level and discharged from the capacitor C2. At this time, by connecting the resistor Rt in parallel to the thermistor TH or the like, the discharge time constant is changed and the discharge time is shortened, and the microcomputer IC1 detects a pseudo high temperature state via the port P6. It will be. Then, based on the result, the microcomputer IC1 judges that there is a fire, and the port Pf
To a high level, the transistor Q4 of the switching circuit B1 is turned on to switch between the terminals C and L, and at the same time, the transistor Q3 is turned on to turn on the confirmation light of the light emitting diode LED. The timing of this switching operation is performed at a predetermined timing according to the inspection operation of the system described later, and the inspection signal is output from the terminals C and L. In this way, by changing the discharge time constant based on the inspection input, it is possible to detect a high temperature in a pseudo manner, and the inspection operation can be performed easily. At this time, the microcomputer IC1 stores the inspection result in a built-in storage means (not shown).

After this inspection output, the microcomputer IC1 performs the forward operation so that the inspection input from the receiver side to the next sensor can be performed. At this time, the emission operation of the emission circuit B8 described later is performed. The port P3 is set to the high level to stop the transistor Q7, and the port P2 is set to the high level to turn on the transistor Q7 of the short circuit B7 to turn on the transistor Q6 and short-circuit the terminals GI and GO.
As a result, the inspection input voltage of the output line 7 input to the terminal GI flows to the next sensor via the terminal GO, and the next sensor performs the inspection operation in the same manner as above. And
After this operation, the microcomputer IC1 continues the run state because the voltage continues to the terminal GI, and performs the normal operation of performing fire monitoring while monitoring the input state of the terminal GI. At this time, current consumption will increase in the entire system of FIG. 4, but since the inspection operation is temporary, there is no problem.

The terminals GI and GO to which the output line 7 is connected have polarities, and if the output line 7 is mistakenly connected in reverse, the internal parts may be defective. Therefore, the terminal GO
In order to protect the internal parts by discharging the input to the common line 2 which is at the ground potential when there is an input, the discharging circuit B8 is provided between the terminal GO and the terminal C. That is, when there is an input from the terminal GO, the transistors Q9 and Q10 are turned on before the transistor Q6 of the short circuit B7 and are discharged to the terminal C via the resistor R33 having a small resistance value.

In the inspection operation of the system described later, FIG.
The checker 12 of FIG. 1 applies a voltage to the output line 7 from the terminal G to perform pulse output. However, if there is a wrong connection of the output line 7 to each sensor 4 in reverse, the operation of the emission circuit B8 Therefore, the potential becomes a potential indicating an erroneous connection due to the resistor R33. As a result, the inspector 12 determines the presence of an erroneous connection by detecting the potential, and also knows the sensor that has been inspected normally, so that it is possible to determine the number of the erroneously connected sensor. .

In the sensor, if the discharge circuit B8 operates during the above-mentioned forward operation, the inspection input is discharged to the terminal C even if the terminals GI and GO are short-circuited, and the next sensor is detected. I can't send. Therefore, during the above-described forward feeding operation, the port P3 is set to the high level to turn on the transistor Q8 of the emission circuit B8 and turn on the transistor Q9.
No operating voltage is applied to.

Here, the microcomputer IC1 performs a fire detection operation by using the heat detection circuit B4 for detecting heat due to a fire based on the temperature characteristic of the thermistor TH in the run state, and then stops the operation as a stop state. The resistor R1 and the capacitor C1 of the oscillator circuit B5 are an example of a charging circuit, and the inverter IC
4 is an example of a starting circuit.

Further, the transistor Q of the input detection circuit B6
5 and the transistor Q1 are an example of an inspection detection circuit, and the microcomputer IC1 is an example of a control circuit that performs a fire detection operation based on an input to the port INT and at the same time performs an inspection operation when there is an input to the port P1. .

Further, the microcomputer IC1 is an example of a control circuit for detecting heat from an impedance circuit formed by resistors R11 and R12 including a thermistor TH as a fire detection element and a capacitor C2, and a transistor Q5 and a transistor of the input detection circuit B6. Q1 is an example of an inspection detection circuit, and the resistor Rt is an example of an inspection impedance circuit.

In FIG. 2, the smoke detector 4s, like the heat detector 4h, has terminals C and L to which power and signal lines 2 and 3 are respectively connected, a constant voltage circuit B2, an oscillation circuit B5, and a reset circuit. It has a circuit B3, a switching circuit B1, an input detection circuit B6, a short circuit B7, and an emission circuit B8. Further, instead of the heat detection circuit B4 as a fire detection circuit, scattered light due to smoke in the smoke detection unit that intercepts outside light (not shown) is received based on the light emission of the light emitting diode Ls as a light emitting element under the control of the microcomputer IC5. It has a light emitting circuit B14 for detecting smoke from a fire by the output of a photodiode PD as a light receiving element, an amplifier circuit B11, and a sample hold circuit B12.

Next, the operation of the smoke detector 4s will be described. The microcomputer IC5 is the microcomputer I of the heat detector 4h.
Similar to C1, the port INT based on the constant oscillation circuit B5
When an interrupt input is input, the state changes from the stop state to the run state, and smoke detection is performed when the number of inputs to the port INT reaches a specified number. The voltage between the capacitor C1 and the resistor R1 of the oscillator circuit B5 starts charging from the same state as the power source to the capacitor C1 via the resistor R1 and the potential drops. When this potential drops to the port threshold voltage of the AND gate IC6, the output of the AND gate IC6 to the port INT of the microcomputer IC5 changes from the high level to the low level. Then, the microcomputer IC5 uses the port I
Detects low level input to NT.

When smoke is detected, the microcomputer IC5
Causes the port P7 to go high in order to discharge the electric charge of the capacitor C3 charged through the resistor R26 in the light emitting circuit B14, causing the light emitting diode Ls to emit light. The light reception output of the photodiode PD at this time is input to the port P6 of the comparator built in the microcomputer IC5 through the amplifier circuit B11 and the sample hold circuit B12.

When it is determined that a fire occurs based on the measurement result, the microcomputer IC5 sets the port Pf to the high level and causes the switching circuit B1 to connect between the terminals C and L in accordance with the discrimination standard preset in the storage means or the like. And the confirmation lamp LED is turned on at the same time.

At the time of inspection, the smoke sensor 4s is applied with a voltage as an inspection input to the terminal GI through the output line 7. Depending on the voltage of the terminal GI, the transistor Q5 of the input detection circuit B6
Is turned on, and accordingly, the input of the AND gate IC6 is set low, and a low level signal is sent to the interrupt port INT of the microcomputer IC5. This interrupt port INT
The input to the heat detector 4h is different from the common method with the oscillator circuit B5 via the dual diode D2, but when the potential becomes low level due to the charging of the capacitor C1 of the oscillator circuit B5 described above. , And the input of the AND gate IC6 becomes low and a signal is sent to the interrupt port INT of the microcomputer IC5, so that the same operation is performed. Whether or not the input is from the input detection circuit B6 can be distinguished by the fact that the input level to the port P1 of the microcomputer IC5, which is simultaneously input, is the low level. That is, the microcomputer IC5 detects that the input level to the port P1 is a low level, determines that the input is an interrupt input from the input detection circuit B6, and starts the inspection operation, like the heat detector 4h. .

In the check operation of the smoke detector 4s by the microcomputer IC5, first, in order to charge the capacitor C3 early, the port P5 is set to the high level and the resistor R26 is connected to the resistor R26.
Charge 25 in parallel. Then, the ports P7 and Pt are simultaneously set to a high level to cause the light emitting diode Ls and the inspection light emitting diode Lt to emit light. The light emitting diode Lt for inspection allows light to be directly input to the photodiode PD by the arrangement in the smoke detection unit (not shown), and the output of the photodiode PD becomes large even if there is no smoke, and the port P6 Through this, the microcomputer IC5 will detect smoke of high density in a pseudo manner. Then, based on the result, the microcomputer IC6 determines that there is a fire, sets the port Pf to the high level, switches the terminals C and L by the switching circuit B1, and turns on the confirmation lamp by the light emitting diode LED. Similar to the heat sensor 4h, the timing of this switching operation outputs an inspection signal at a predetermined timing in accordance with the inspection operation of the system described later. At this time, the microcomputer IC5
Stores the inspection result in a built-in storage means not shown in detail.

After this inspection output, the microcomputer IC 5 performs the forward operation so that the inspection input to the next sensor from the receiving side can be performed by the short circuit B7, similarly to the heat sensor 4h, and the terminal GI. And the terminal GO are short-circuited. Then, after this operation, the microcomputer IC5 continues the run state and performs the normal operation of performing fire monitoring while monitoring the input state of the terminal GI. Further, when the discharging circuit B8 operates during the forward feeding operation, the inspection input is discharged to the terminal C even if the terminals GI and GO are short-circuited. Therefore, during the forward feeding operation, the port P3 is set to the high level and the transistor of the discharging circuit B8 is turned on. It is necessary to turn on Q8 so that no operating voltage is applied to the transistor Q9. Here, instead of the resistor R33 of FIG. 1, a Zener diode Z1 is provided in series with the transistor Q8 of the emission circuit B8 to perform the same operation.

Here, the microcomputer IC5 is a photodiode serving as a light receiving element that receives scattered light due to smoke in a smoke detection unit that blocks external light based on the light emission of the light emitting diode Ls serving as a light emitting element in the run state. 1 is an example of a control circuit that performs a fire detection operation using a light emitting circuit B14, an amplifier circuit B11, and a sample hold circuit B12 for detecting smoke due to a fire based on the output of a PD, and then enters a stop state as an operation stop state,
The resistor R1 and the capacitor C1 of the oscillator circuit B5 are an example of a charging circuit, and the AND gate IC6 is an example of a starting circuit.

Further, the transistor Q of the input detection circuit B6
5 is an example of an inspection / detection circuit, and the microcomputer IC5 is
This is an example of a control circuit that performs a fire detection operation based on an input to the port INT, and at the same time performs a check operation when a low input is made to the port P1.

Further, the microcomputer IC5 outputs the output of the photodiode PD as a light receiving element for receiving scattered light due to smoke in the smoke detecting section for blocking outside light based on the light emission of the light emitting diode Ls as a light emitting element for fire detection. Light-emitting circuit B1 for detecting smoke due to fire by
4, amplifier circuit B11 and sample hold circuit B12
Is an example of a control circuit that performs a fire detection operation by using the, the transistor Q5 of the input detection circuit B6 is an example of an inspection detection circuit, and the light emitting diode Lt is an example of an inspection light emitting element.

Although the thermistor type heat detector 4h and the photoelectric type smoke detector 4s, which are specific examples of the fire detector 4 used in the system of FIG. 4, have been described above, other types of flame detectors, such as flames, have been described. The sensor, the odor sensor, and the like can be used by forming the circuit configuration as shown in FIG. Here, the control circuit Bc is the microcomputer IC of FIG.
1. Fire detection circuit Bf corresponding to the microcomputer IC5 of FIG.
Corresponds to the heat detection circuit B4 in FIG. 1, the light emitting circuit B14 in FIG. 2, the amplifier circuit B11 and the sample hold circuit B12, and the input circuit Bi is the dual diode D2 in FIG.
Etc. corresponds to the AND gate IC6 of FIG. Input circuit B
i is an interrupt input to the microcomputer serving as the control circuit Bc by an input from the oscillation circuit B5 or the input detection circuit B6 and a check input at the time of input of the input detection circuit B6. When configuring other types of detectors, the fire detection circuit Bf may be matched with the detection target. For example, in the case of a flame detector, a fire detection circuit using a pyroelectric element or a UV lamp, odor detection, etc. In the case of a container, a fire detection circuit using a semiconductor element such as stannic oxide or a crystal oscillator may be used.

Hereinafter, the heat detector 4h and the smoke detector 4s described above will be described.
Will be used to describe the entire system of FIG.

In FIG. 4, for example, a plurality of fires provided in each room or the like are connected to a power supply / signal line composed of a common line 2 and a line line 3 drawn from a fire receiver 1 provided in a living room in a house (not shown). The sensor 4 is connected in parallel by the feed wiring, and the terminating resistor 5 is connected to the rear ends of the signal lines 2 and 3.

Further, between the fire receiver 1 of the signal lines 2 and 3 and each fire detector 4, the common line 2 and the line line 3 are normally switched and connected to the fire receiver 1. 6 are arranged. An output line 7 is provided from the line switching device 6 for performing inspection input to each fire detector 4. This output line 7 is connected to each fire detector 4 as described above.
The fire detector 4 at the rear end is connected to the common line 2 via the terminating diode 8. The output line 7 is not supplied with the inspection input at all times and is in a non-voltage state. Also, the line switching device 6
Therefore, the inspection output line 9 is wired on the side of the fire receiver 1.

At all times, each fire detector 4 performs the above-mentioned fire monitoring by the power source supplied from the fire receiver 1 through the signal lines 2 and 3, and when the fire is detected, performs a switching operation to perform the signal line 2, A short circuit is established between the three. The fire receiver 1 detects a substantially short-circuit state based on the switching operation and performs a fire notification operation. At this time, the fire receiver 1 displays, for example, a fire on the outdoor display device 10 which is provided at the side of the entrance and is connected to the fire receiver, or is not a complete house unit, and a not-shown home building receiver is provided for monitoring control of the entire building. When necessary, it outputs the necessary fire signal. At the time of inspection, the inspection device 12 is connected to the connector 11 that is pulled out from the line switching device 6 to the outside, for example, the outdoor display device 10 side. Based on the inspection operation from this inspection device 12,
The line switching device 6 outputs an inspection start output to the fire receiver 1 through the inspection output line 9 to display the fact that the fire receiver 1 is in the process of being inspected, and also displays the signal lines 2 and 3 to each fire detector 4. , Disconnect from the fire receiver 1 and connect to the inspection device 12. In this state, the fire receiver 1 performs an inspection display based on the inspection start output of the track changer 6, and the outdoor inspection from the inspector 12 is enabled. At this time, each fire detector 4 is operated by the power supplied from the checker 12 through the signal lines 2 and 3.

There are three inspection modes from the inspector 12. There are an outdoor inspection mode in which a test is performed from the outside without entering the room and whether the whole system is good or bad, and when there is an abnormality in the inspection mode, It has a sensor specifying mode for entering a room and specifying the location of an abnormal fire sensor, and a sensor specifying mode for inspecting only a specific sensor.

FIG. 5 shows the terminal G of the inspection device 12 to the output line 7 in the outdoor inspection mode when n fire detectors 4 are connected.
Output, the terminal GI input of each fire detector 4 from the output line 7,
And signal waveforms detected between the terminals C and L of the inspection device 12 by the signal lines 2 and 3. The checker 12 has an output line 7
A voltage as an inspection input is applied to the terminal G to output pulses A, B, and C having a width of 5 mS, for example, at the timing shown in FIG.

Between the terminals GI and GO of each fire detector 4 is always open as described above, and 1 in the waveform of FIG.
The second sensor starts its checking operation when the built-in microcomputers IC1 and IC5 rise by the voltage application to the terminal GI and the pulse A1 falls. If the detector is a photoelectric smoke detector 4s, this inspection operation is a fire with light emission at about 3 second intervals and three consecutive detections during normal fire monitoring. The inspection is performed by detecting once based on the light emission of the light emitting diode Lt. Further, in the case of the thermistor type heat sensor 4h, the inspection is performed by connecting the fixed resistance Rt in parallel to the thermistor TH. Furthermore, even in a heat sensor using a bimetal or an air chamber, the contact mechanism performs a closing operation, and inspection is performed by a pseudo input method. Here, the interval TW1 between the pulse A and the pulse B in FIG. 6 is a time sufficient for each fire detector 4 to perform the inspection operation, for example, 0.5 seconds.

If the inspection result is normal, the first sensor detects the pulse C1 from the falling edge of the pulse B1.
The terminals C and L are switched until the trailing edge of 1. The waveform of the signal appears as a pulse in the waveform between the terminals C and L of the checker 12 in FIG. The corresponding interval TW2 between the pulse B and the pulse C in FIG. 6 may be any time that the inspector 12 can detect as an inspection signal for operation confirmation,
For example, it is 20 mS. Then, when the falling edge of the pulse C1 in FIG. 5 is detected, the terminals GI and GO are short-circuited, and as a result, after the completion of the pulse C1 transmission, the terminal G of the second sensor is detected.
A voltage is applied to I as a check input, and the built-in microcomputers IC1 and IC5 start up. Corresponding pulse C in FIG.
And the interval TW3 of the next pulse A is the microcomputer IC1, IC5
Takes enough time to stand up, for example 30mS
It is.

At the fall of the pulse A2 in FIG. 5, the second sensor starts the inspection operation. At this time, the first sensor short-circuits between the terminals GI and GO and at the same time a normal fire occurs. The monitoring operation is continued and a pulse is detected from the terminal GI at the same time as the second sensor, but the inspection operation is not performed. After the inspection of the last nth sensor is completed, the output line 7 is connected to the common line 2 via the termination diode 8, and the inspection device 12 detects the current flowing through the termination diode 8 and Stop the output of terminal G after finishing the inspection of the sensor. In each sensor 4, the transistor Q5 of the input detection circuit B6 is turned off based on the stop of the inspection input to the terminal GI, the ports P2 of the microcomputers IC1 and IC5 are set to the low level, and the transistors Q6 and Q7 of the short circuit B7 are turned on. It is turned off and the terminals GI and GO are opened to return to the normal monitoring state.

As described above, in the outdoor inspection mode, a signal for inspection input is sent to the terminal GI of each sensor 4 by using the output line 7 and the terminals GI and GO are short-circuited after the inspection operation, so that the sequential feeding is surely performed. The inspection operation is performed, and the inspection signal based on the inspection result is detected as a pulse between the terminals C and L of the inspector 12 up to the n-th sensor, so that the number of sensors for which the inspection operation is normally completed and the abnormality are detected. You can figure out what number the sensor is. Further, the sensors connected to the same signal lines 2 and 3 other than those under inspection are continuing the fire monitoring by the power from the checker 12 supplied through the power / signal lines 2 and 3,
The detector that detects a fire gives a normal fire signal. The inspector 12 determines a fire by detecting a signal that is not synchronized with the interval TW2 between the pulses B and C in FIG.

Next, the detector specifying mode for specifying the location of the abnormal fire detector when there is an abnormality in the outdoor inspection mode will be described. The waveforms at this time are shown in FIGS. 7 and 8 as in FIGS. 5 and 6.

Between the terminals GI and GO of each of the fire detectors 4 is open after the outdoor inspection mode has been completed and the inspection input voltage is not output from the inspection device 12. When the inspector 12 is switched from the outdoor inspection mode to the detector specifying mode, the inspector 12 outputs the pulses A1 to Cn having the pulse width of 5 mS as shown in FIG.
In the sensor, the built-in microcomputer starts up when a voltage is applied as a check input to the terminal GI, and the check operation starts when the pulse A1 in FIG. 7 falls. Then, as shown in FIG. 8, the interval TW4 between the pulse A and the pulse B in the sensor specific mode is 20 mS, for example, and the pulse B is immediately transmitted unlike the outdoor inspection mode. Due to the detection of the pulse B at a short timing, the sensor interrupts the inspection operation, and from the inspection result in the outdoor inspection mode immediately before stored in the microcomputers IC1 and IC5, if there is no abnormality, from the trailing edge of the pulse B to the pulse C Turn on the confirmation light until the fall of. The operation time TW5 is a time, for example, 0.5 seconds, in which the confirmation light can be visually confirmed sufficiently to identify the sensor indoors. Then, as in the outdoor inspection mode, when the falling edge of the pulse C1 is detected, the first sensor short-circuits the terminals GI and GO, and the voltage is applied to the terminal GI of the next sensor as an inspection input.
Similarly, the built-in microcomputer starts up. The interval TW3 between the pulse C and the next pulse A is the same as described above.

As described above, in the detector specifying mode, each fire detector 4 is made to turn on the confirmation light up to the nth detector based on the inspection result by using the result of the immediately preceding outdoor inspection mode. is there. That is, even if the presence or number of an abnormal sensor is known in the outdoor inspection mode, the position cannot be specified specifically, and the actual wiring may be different even with detailed equipment data. Therefore, it is possible to visually confirm that the normal sensor is lit and the abnormal sensor is not lit depending on the sensor specifying mode, which is an effective means for confirming the specific position of the abnormal sensor. Also, as in the outdoor inspection mode, it goes without saying that the detectors other than the one being inspected continue to monitor the fire.

Next, the detector designation mode for confirming the location of the specified abnormal fire detector will be described.
The waveforms at this time are shown in FIGS. 9 and 10, as in FIGS. 5 and 6 or FIGS. 7 and 8. In this mode, the inspector 12 specifies the number of the sensor to be confirmed (second in FIG. 7), and the inspector 12 applies the voltage from the terminal G only to the specified sensor for the output line 7. Then, pulse output is performed at the same timing as in FIG. 8, and the interval TW6 between the pulse B and the pulse C is shortened to, for example, 20 mS for other sensors as shown in FIG.

Between the terminals GI and GO of each of the fire detectors 4 is open after the outdoor inspection mode is finished and the inspection input voltage is not output from the inspection device 12. When the outdoor inspection mode is switched to the sensor specifying mode, pulses A1 to Cn having a pulse width of 5 mS as shown in FIG. 9 are output from the terminal G. The sensor is terminal G
When the voltage is applied to I, the built-in microcomputer starts up,
The inspection operation starts when the pulse A falls. Then, the pulse B is immediately transmitted, the inspection operation is interrupted, and from the inspection result in the outdoor inspection mode immediately before, if normal, the confirmation lamp is turned on from the fall of the pulse B to the fall of the pulse C. Regarding this operating time, the interval TW5 between the pulses B2 and C2 for the second sensor shown in FIG. 9 is enough to visually confirm the confirmation light for identifying the sensor indoors. Sensors other than the 2nd (1st or nth)
With regard to the above, the pulse output is performed from the checker 12 at the interval TW6 of the timing shown in FIG. 10, and the forward feed is simply performed at an early timing.

As described above, in the sensor designation mode, similarly to the sensor identification mode, the result of the outdoor inspection mode is used to turn on the confirmation lamp up to the nth sensor based on the inspection result for each fire sensor. 4 makes it possible to turn on the confirmation lamp for a sufficient time only for the sensor that is expected to be abnormal, and shorten the other sensors. That is, it is possible to specifically specify the position of the abnormal sensor in the sensor specifying mode and confirm it. Therefore, the sensor designation mode is an effective means for confirming that the sensor is abnormal. Also, as in the other modes, it goes without saying that the detectors other than those under inspection are continuing the fire monitoring.

As described above, according to the first invention of the present application, the fire detection operation is performed by using the fire detection unit for detecting the physical quantity based on the fire phenomenon, and the microcomputers IC1 and IC5 as the control circuits are brought into the operation stop state. , An oscillation circuit B5 as a charging circuit, and an inverter IC4 or an AND gate I as an activation circuit for detecting the charging of a predetermined potential to the capacitor C1 of the oscillation circuit B5 and performing activation input to the microcomputer IC1 or the like.
Since C6 is provided, it is possible to stop the other circuits during the charging of the capacitor C1 by utilizing the stop state of the microcomputers IC1 and IC5, and to obtain a low-consumption fire detector. it can.

In the second invention of the present application, the microcomputers IC1 and IC5 as control circuits and the microcomputer IC1 as control circuits that perform the fire detection operation by using the fire detection unit that detects the physical quantity based on the fire phenomenon and are in the operation stop state. , An inverter IC4 or an AND gate IC6 as a starting circuit for starting input to the IC5 at a predetermined timing, and an inspection detection circuit B6 for performing starting input and inspection start input to the microcomputers IC1, IC5 based on an external inspection input. The microcomputers IC1 and IC5 perform the fire detection operation based on the activation input and perform the inspection operation when there is the inspection start input together with the activation input. Therefore, the interrupt input shifts from the stop state to the run state. Then, it is possible to easily determine that the interrupt input is from the inspection detection circuit B6. That.

Further, in the third invention of the present application, a fire detecting operation is performed by using a fire detecting section for detecting a fire from a value according to a CR time constant in which a capacitor C2 is connected to an impedance circuit including a thermistor TH as a fire detecting element. It has a microcomputer IC1 as a control circuit and an inspection detection circuit B6 for performing an inspection start input to the microcomputer IC1 based on an inspection input from the outside. The microcomputer IC1 inspects the impedance circuit when there is the inspection start input. Since the inspection impedance circuit by the resistance Rt for inspection is connected and the inspection operation is performed from the value based on the CR time constant for inspection, pseudo fire determination can be easily performed.

Furthermore, the fourth invention of the present application activates the light emitting circuit B14 for causing the light emitting diode Ls as the light emitting element for fire detection to emit light, and the photodiode as a light receiving element not facing the light emitting element for fire detection. P
Microcomputer IC5 as a control circuit that performs a fire detection operation using a fire detection unit that detects a fire from the value output from D
And an inspection detection circuit B6 for performing an inspection start input to the microcomputer IC5 based on an inspection input from the outside. When the inspection start input is present, the microcomputer IC5 is connected to the photodiode PD at the same time as the light emitting diode Ls. Since the light emitting diode Lt serving as the opposite light emitting element for inspection is caused to emit light and the inspection operation is performed from the value obtained from the output of the photodiode PD at this time, pseudo fire discrimination can be easily performed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a thermistor type heat detector as a specific example of a fire detector.

FIG. 2 is a circuit diagram of a photoelectric smoke detector as a specific example of a fire detector similar to FIG.

FIG. 3 is a block circuit diagram showing a configuration required as a fire detector.

FIG. 4 is a schematic configuration diagram of a system that can use each fire detector.

5 is a signal waveform diagram in the outdoor inspection mode of FIG.

FIG. 6 is a signal waveform diagram showing the timing of the pulses of FIG.

FIG. 7 is a signal waveform diagram in the sensor specific mode of FIG.

FIG. 8 is a signal waveform diagram showing the timing of the pulses of FIG.

9 is a signal waveform diagram in the sensor designation mode of FIG.

FIG. 10 is a signal waveform diagram showing the timing of the pulses of FIG.

[Explanation of reference symbols] IC1, IC5 control circuit IC4, IC6 start-up circuit B5 charging circuit B6 inspection detection circuit

Claims (4)

[Claims] 1. A control circuit that performs a fire detection operation using a fire detection unit that detects a physical quantity based on a fire phenomenon, and then becomes an operation stop state, a charging circuit, and a predetermined charging potential of the charging circuit is detected. And a starting circuit for performing starting input to the control circuit. 2. A control circuit that performs a fire detection operation using a fire detection unit that detects a physical quantity based on a fire phenomenon, and then enters an operation stop state, and a start input that performs a start input at a predetermined timing to the control circuit. A check detection circuit that performs a start input and a check start input to the control circuit based on a check input from the outside, and the control circuit performs the fire detection operation based on the start input, A fire detector characterized by performing an inspection operation when there is the inspection start input together with the start input. 3. A control circuit that performs a fire detection operation using a fire detection unit that detects a fire from a value based on a CR time constant in which a capacitor is connected to an impedance circuit including a fire detection element, and based on an inspection input from the outside. An inspection detection circuit for performing an inspection start input to the control circuit, wherein the control circuit connects an impedance circuit for inspection to the impedance circuit when there is the inspection start input, and detects a value based on a CR time constant for inspection. A fire detector characterized by performing an inspection operation. 4. A fire detection operation is performed using a fire detection unit that activates a light emitting circuit that causes the fire detection light emitting element to emit light, and detects a fire from the value of the output of a light receiving element that does not face the fire detection light emitting element. And a check detection circuit for performing a check start input to the control circuit based on a check input from the outside, wherein the control circuit has the fire detection light emitting element when the check start input is present. At the same time, the inspection light-emitting element facing the light-receiving element is caused to emit light, and the inspection operation is performed based on the value of the output of the light-receiving element at this time.