JPS5812092A - Fire detection circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a four-way fire detection system.

Conventionally, when the t:l sensor that detects a fire etc. is activated and the receiver displays an error display while displaying an alarm and becomes self-holding, the receiver's recovery switch is used to recover the signal. When an abnormality is detected and it is operating, the alarm and abnormality display will be displayed again.If you want to stop this rounded alarm display, etc., you will have to operate the recovery switch many times until the J-Ser stops operating. In addition, even if the sensor is activated by operating the t&recovery switch, it is not possible to display only an abnormality display when an alarm is displayed.

The present invention has been provided in view of the above-mentioned points, and when the sensor detects an abnormality, a warning display and an abnormality display are performed, and if the sensor is still operating after operating the recovery switch - times. However, the object of the present invention is to provide a fire detection circuit that only displays an abnormality without displaying an alarm, and restores the initial state IIK when the sensor no longer detects an abnormality and recovers.

Embodiments of the present invention will be described below in detail with reference to the drawings (in Figure 0, υ is a fire sensor that detects flames, etc.).

) and sensors (1) installed at appropriate locations within the mold.
are connected in parallel with the terminating resistor R. Furthermore, the sensor (
υ may be a sensor that detects gas or a crime prevention device that uses ultrasonic waves. This is an abnormality detection circuit that outputs an abnormality signal. This abnormality detection circuit (S) is composed of two converter circuits (6) (6). A sensor (
When an abnormality is detected from 1), the output signal of the comparator (B) (6) of the abnormality detection circuit (2) remains at H level if there is no short circuit or disconnection in the wiring. . (3) is a self-holding circuit that displays an alarm or an abnormality based on the abnormality signal from the abnormality detection circuit (abnormality detection circuit). This is the structure of the whelk. The LED is a light emitting diode (diode) that is a display element, and when the sensor (1) detects an abnormality and is operating, the light emitting diode LED blinks or lights up to indicate an abnormality. The light is off in the normal warning signal m when υ does not detect an abnormality. (4) is a sensor (after υ detects an abnormality and displays an alarm and an abnormality display, a recovery signal R8 is activated by operating the recovery switch. The self-holding circuit (8) is a control circuit that operates manually and lights up the light emitting diode LED only when the sensor (υ) detects an abnormality.
4) is composed of a resistor R1 and a diode D8.

Now, when the sensor (1) does not detect any abnormality and in the case of the warning signal 11 where there is no short circuit or interruption line in the wiring, the output terminals of the cosciparators (5) and (6) are at the H level.

Further, the output terminal of the self-holding circuit (8) is also at L level.

Therefore, the output terminal of the NAND circuit (9) becomes H level, and the base of the transistor 'fr becomes H level.

The transistor Tr is turned off and the light emitting diode LED
is off. Current cycle: J sensor (When IJ detects a fire, the output level of comparator (5) (6) changes from H level to L level, a pulse signal as shown in the figure is output to output 11 of conductor CI, and the inverter An H level pulse signal is input to the input terminal of the NOR circuit (υ) through the circuit signal, and the output terminal of the NOR circuit (8) is self-held at the H level.Therefore, this H level signal is used to display an alarm. At the same time, the negative input terminal of the NAND circuit (9) is at H level, and the external input terminal receives a synchronizing signal SS such as the zero signal shown in the figure. , the output terminal of the NAND circuit (9) alternately outputs L level and H level in synchronization with the synchronization signal SSK.Then, the NAND circuit (9)
Since the transistor 7r is turned on only when the output terminal of the light emitting diode is at L level, the current flows through the light emitting diode LED, causing it to blink. This blinking of the light emitting diode LED is an abnormality display performed together with an alarm display. Next, in this state, when the recovery signal R5 of the -power input JIIIKH level of the NOR circuit (8) of the self-holding circuit (3) is input by operating the return switch, the output terminal of the NOR circuit (8) changes from H level to L level, self-holding is canceled and the alarm display is canceled. But at this time.

As before, when the sensor (υ) detects an abnormality, the abnormality detection circuit (2) outputs an abnormal signal and fP remains as it is, that is, the output level of the comparator (6) is at the L level. 1, so the resistance R of the control circuit (4)
It is necessary to turn on the transistor 7r through the diode DI and the light emitting diode I.
JD is turned on. Therefore, this light emitting diode LE
Lighting of D does not indicate an alarm, but indicates an abnormality that is continuing.

When the sensor (1) returns in this state, the output level of the comparator (5) (6) becomes H level.

Transistor 7r is turned off and the light emitting diode LED
The light goes out, indicating that the abnormality has been resolved. In this state, the entire circuit automatically enters the alert state again, and if the sensor (1) detects an abnormality again, it will issue the alarm indicator abnormality display as described above.

As described above, the present invention includes an abnormality detection circuit that outputs an abnormality signal due to the output signals of a sensor that detects flame or smoke, an ST sensor, etc., or a short-circuit interruption line of the wiring from the sensor to the input terminal, and the abnormality detection A self-holding circuit that displays an alarm with an abnormal signal from the circuit and causes the display element to blink, and clears self-holding with a recovery signal that cancels the alarm display and blinking of the display element, and a self-holding circuit that clears the self-holding after the recovery signal is input to the self-holding circuit. The device is equipped with a control circuit that lights up the display element only when there is an abnormality signal from the detection circuit, and turns off the display element when the sensor returns to normal, so that when the sensor detects an abnormality, the output of the self-holding circuit changes. The alarm display and the flashing abnormality display by the display cable are performed to notify the user, and the self-holding of the self-holding circuit is released by the recovery signal of one switch operation, and the alarm display is released. Only when the sensor detects an abnormality, it can be notified by indicating an abnormality by lighting up the display element without displaying an alarm. When the sensor no longer detects an abnormality, it returns to the initial state and returns to the alert state. It is effective.

[Brief explanation of drawings]

The figure is a specific circuit diagram of an embodiment of the present invention, (υ sensor, (2) abnormality detection circuit, (3) self-holding circuit. (4) is the control circuit. Agent Patent Attorney Ishi 1 ) Long Nachimochikan 58-12092 (3)

Claims (1)

[Claims] (υ A sensor that detects flame rays I11, etc., an abnormality detection circuit that outputs an abnormality signal when the wiring is shorted and interrupted up to 1m of input from the J sensor, and A self-holding circuit that displays an alarm with an abnormal signal and causes the Kl! indicator to blink, and cancels self-holding with a recovery signal that cancels the flashing of the display element while the alarm is displayed, and an error after inputting the O recovery signal to the self-holding circuit. A fire detection circuit comprising: a control circuit that lights up the display element only when there is an abnormal signal from the detection circuit, and turns off the Kll display element when the Ki! sensor returns.