JP4764734B2 - Alarm - Google Patents

Description

  The present invention relates to an alarm device that outputs a voltage signal having a different voltage for each generated alarm state when an alarm state occurs in a monitoring target such as gas or incomplete combustion.

  For example, in an alarm device that monitors the occurrence of gas leaks or incomplete combustion of gas due to combustion equipment in a house, when an alarm condition occurs in the monitoring target, the contents of the alarm device are connected to other alarm devices connected by wire or wirelessly or remotely. In order to notify the local monitoring center, an external output circuit is provided for outputting a voltage signal having a different voltage for each generated alarm state from the external output terminal to the outside of the alarm device.

  Generally in such an alarm device, the voltage of the voltage signal output from the external output circuit is DC 6 V when the alarm state is not generated (normal time), and at the time of gas leak alarm (for example, when detecting methane gas in the case of city gas) DC12V, DC18V is set at the time of incomplete combustion alarm (when carbon monoxide gas is detected), and the voltage of the voltage signal becomes 0V at the time of alarm failure such as power failure or sensor disconnection (for example, patent References 1, 2).

In addition, an allowable range is actually determined for the voltage of each voltage signal, for example, 0V to DC3V for 0V, DC5V to 6V for DC6V, DC11V to 13V for DC12V, If DC18V is within the range of DC18V to 22V, it is recognized as a voltage signal of 0V, DC6V, DC12V, and DC18V.
JP 2001-34861 A JP 2002-279548 A

  By the way, in the above-mentioned conventional alarm device, although it does not become 0 V at the time of a power failure or disconnection, the voltage of the voltage signal may rise or fall beyond the allowable range due to an internal failure of the external output circuit. is there.

  In such a case, on the receiving side of the voltage signal, the voltage of the voltage signal does not fall within the allowable range. However, since the voltage signal is not 0V, it cannot be recognized that the alarm device is out of order.

  Therefore, even though the alarm device cannot actually monitor the occurrence of gas leakage or incomplete combustion of the gas, it cannot be recognized from the voltage signal. There is a risk.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to increase or decrease the voltage from a predetermined value to a voltage signal of a voltage indicating a certain alarm state due to a failure of a generation position of the voltage signal or the like. When an abnormality occurs, an alarm device that can notify the outside of the failure even if the abnormality does not correspond to an alarm state that should change the voltage signal to the voltage at the time of the failure It is to provide.

In order to achieve the above object, the alarm device of the present invention described in claim 1 is generated when an alarm state occurs in a monitoring target such as gas or incomplete combustion as shown in a basic configuration diagram in FIG. In an alarm device that outputs a voltage signal having a different voltage for each generated alarm state, generated based on a command signal having a pattern corresponding to the alarm state, a test signal for a voltage corresponding to the voltage of the voltage signal And a normal voltage of the voltage signal corresponding to a pattern of the command signal that is a basis for generating the voltage signal corresponding to the inspection signal. Determining means A for determining whether or not the voltage of the inspection signal matches a voltage band within an allowable range before and after the voltage, and a basis for generating the voltage signal corresponding to the inspection signal. The command signal pattern When the determination means A determines that the voltage according to the normal voltage of the voltage signal does not match the voltage band within the allowable range before and after the voltage, the voltage of the voltage signal A voltage abnormality notifying unit B for performing a notification operation for notifying the outside of the abnormality, and the voltage signal is output to the outside at a voltage different from that at the time of occurrence of the alarm state to be monitored when a failure occurs, and the determination unit A further determines whether or not the voltage of the inspection signal matches a voltage according to the voltage of the voltage signal at the time of the failure or a voltage band within an allowable range before and after the voltage. The abnormality notifying means B further determines that the voltage of the inspection signal matches a voltage corresponding to the voltage of the voltage signal at the time of the failure or a voltage band within an allowable range before and after the voltage. If the An alarm about the parts, if it is determined not to match, characterized by notifying a voltage abnormality of the chromatic voltage signal to the outside.

Further, the alarm device of the present invention as set forth in claim 2, in the alarm device of the present invention according to claim 1, before Symbol voltage abnormality notification unit B, the voltage of the test signal, corresponding to the test signal The determination that the voltage corresponding to the normal voltage of the voltage signal corresponding to the command signal pattern that is the basis of generation of the voltage signal does not match the voltage band within the allowable range before or after the voltage. When the means A makes a determination, the voltage signal that is forcibly changed to the voltage at the time of the failure is output to the outside.

According to the alarm device of the present invention described in claim 1, the voltage of the inspection signal according to the voltage of the voltage signal generated by the inspection signal generation means 9 is the generation of the voltage signal corresponding to the inspection signal. When the determination means A determines that the voltage corresponding to the normal voltage of the voltage signal corresponding to the base command signal pattern or the voltage band within the allowable range before and after the voltage does not match, the voltage abnormality notification By the notification operation performed by the means B, the abnormality of the voltage of the voltage signal is notified to the outside , and the voltage signal is output to the outside at a voltage different from that at the occurrence of the alarm state to be monitored when a failure occurs, The determination means A determines whether or not the voltage of the inspection signal matches the voltage corresponding to the voltage of the voltage signal at the time of the failure or the voltage band within the allowable range before and after the voltage, and the voltage abnormality notification means B The voltage of the inspection signal is When the determination means determines that the voltage according to the voltage of the voltage signal at the time of occurrence or the voltage band within the allowable range before and after the voltage is met, the occurrence of the failure is notified to the outside, and is matched. If it is determined that the voltage signal is abnormal, the abnormality of the voltage signal is reported to the outside, so that the voltage of the voltage signal indicating a certain alarm state rises from the default value due to a failure in the location where the voltage signal is generated. Alternatively, when an abnormality that decreases occurs, even if the abnormality does not correspond to an alarm state in which the voltage signal should be changed to the voltage at the time of the failure, it can be notified to the outside that it is a failure.

  Further, according to the alarm device of the present invention described in claim 2, in the alarm device of the present invention described in claim 1, the voltage at the time of occurrence of the failure is forcibly generated by the notification operation performed by the voltage abnormality notification means B. Since the changed voltage signal is output to the outside, the voltage of the voltage signal that indicates a certain alarm state does not correspond to the alarm state that should change the voltage signal to the voltage at the time of failure. Even when an abnormality that increases or decreases occurs, the abnormality can be notified and recognized by the voltage of the voltage signal.

  Embodiments of an alarm device of the present invention will be described below with reference to the drawings.

  FIG. 2 is a front view of the gas alarm device according to the first embodiment of the present invention. The gas alarm device of the present embodiment indicated by reference numeral 1 in FIG. 2 has an atmosphere intake hole 1c on the front surface 1a. The detector 1b, the power indicator 1d that lights green when the power is turned on, the incomplete combustion gas indicator 1e that lights yellow when the concentration of carbon monoxide reaches the alarm concentration level, and the concentrations of methane gas and hydrogen reach the alarm concentration level. A gas leak indicator 1f that is lit in red when it reaches and an audio output speaker 1g are provided.

  The detection unit 1b includes a gas detection circuit for detecting city gas (methane gas) and incomplete combustion gas (carbon monoxide gas) as shown in a block diagram of an electrical schematic configuration of the gas alarm device 1 in FIG. 3, the gas detection circuit 3 includes a power indicator 1d, an incomplete combustion gas indicator 1e, a gas leak indicator 1f, a speaker 1g, and a voice in which a plurality of voice messages output from the speaker 1g are stored. The IC 5, the external output circuit 7, and a test signal generation circuit 9 that generates a test signal having a voltage corresponding to the voltage of the voltage signal output from the external output circuit 7, as well as a microcomputer (hereinafter referred to as a microcomputer) that controls these operations. (Abbreviated as “microcomputer”.) 11 is connected to the CPU 11a.

  The gas detection circuit 3 includes a sensing element (not shown) that shows a resistance change when gas is present, and a heater (not shown) that is formed of a metal resistor such as platinum (Pt) to heat the sensing element. When the heater is heated at a high temperature (about 400 ° C.), the gas concentration of the city gas (methane gas) is detected and the heater is heated at a low temperature (about 100 ° C.). The concentration of carbon monoxide gas (CO gas) is detected.

  As shown in the circuit diagram of FIG. 4, the external output circuit 7 is connected to three ports P2 to P4 of the CPU 11a of the microcomputer 11, and according to combinations of ON / OFF states of the ports P2 to P4. As shown in the explanatory diagram of FIG. 5, the voltage signals of 0V, DC6V, DC12V, and DC18V are output at voltages within the respective normal ranges.

  The test signal generation circuit 9 shown in FIG. 4 is a port with a built-in A / D converter of the microcomputer 11 that generates a test signal obtained by dividing the voltage of the voltage signal actually output from the external output circuit 7 with resistors R1 and R2. It is configured to be input to P1. Note that reference numeral 13 in FIG. 4 denotes a surge circuit.

  The microcomputer 11 has a RAM 11b and a ROM 11c in addition to the CPU 11a, and these RAM 11b and ROM 11c are also connected to the CPU 11a.

  The RAM 11b has a data area for storing various data and a work area used for various processing operations, and a control program for causing the CPU 11a to perform various processing operations is stored in the ROM 11c.

  When the power cord (not shown) of the gas alarm device 1 is connected to the outlet and power is supplied, the CPU 11a of the microcomputer 11 causes the power indicator 1d to blink slowly in green, and then waits for a predetermined time. When the time (for example, 1 minute) elapses, the power indicator 1e is lit in green to enter the normal mode, and the process of the gas monitoring mode is executed according to the control program related to gas monitoring stored in the ROM 11c.

  In this gas monitoring mode process, the CPU 11a of the microcomputer 11 detects the resistance at the end of the high-temperature heating period of the sensing elements that are alternately heated in two steps of high and low by alternately energizing the heater of the gas detection circuit 3 with high voltage and low voltage. The concentration of methane gas is calculated from the output of the gas detection circuit 3 according to the value.

  When the calculated concentration of methane gas reaches a predetermined alarm level, the gas leak indicator 1f is lit in red, and a voice message such as “Is gas leaking?” Is read from the voice IC 5 and the speaker 1g. And the ports P2 to P4 are turned OFF, ON, and OFF, respectively, and a DC12V voltage signal is output from the external output circuit 7 (gas leak alarm state).

  Similarly, the CPU 11a of the microcomputer 11 calculates the concentration of carbon monoxide gas from the output of the gas detection circuit 3 corresponding to the resistance value of the sensing element at the end of the low temperature heating period for the heater of the gas detection circuit 3.

  When the calculated concentration of carbon monoxide gas reaches a predetermined alarm level, the incomplete combustion gas indicator 1e lights up in yellow and “Pippo Pippo is dangerous because the air is dirty. Open the window and ventilate. Is read out from the voice IC 5 and ringed (voice output) by the speaker 1g, and the ports P2 to P4 are turned OFF, OFF and ON, respectively, and a DC18V voltage signal is output from the external output circuit 7. (Incomplete combustion alarm state).

  When the concentrations of methane gas and carbon monoxide gas have not reached the alarm level, the CPU 11a of the microcomputer 11 displays the power indicator 1d in green at high speed when the gas alarm device 1 fails such as disconnection of the gas detection circuit 3. In addition to blinking, a voice message such as “Failure has occurred” is read from the voice IC 5 and ringed (voice output) by the speaker 1g, and the ports P2 to P4 are turned on, off, and off, respectively. The voltage of the voltage signal output from the output circuit 7 is set to 0 V (failure alarm state).

  Further, when the concentrations of methane gas and carbon monoxide gas have not reached the alarm level, and no failure of the gas alarm device 1 such as disconnection of the gas detection circuit 3 has occurred, the CPU 11a of the microcomputer 11 The port P2 to P4 are all turned OFF while 1d is lit in green, and a DC 6V voltage signal is output from the external output circuit 7.

  Next, processing related to the voltage monitoring of the voltage signal performed by the CPU 11a according to the control program stored in the ROM 11c during the above-described gas monitoring mode will be described with reference to the flowcharts of FIGS.

  When the microcomputer 11 is activated by the connection to the power source of the gas alarm device 1 and the program starts, the CPU 11a firstly calculates the concentration of methane gas and the carbon monoxide calculated from the output of the gas detection circuit 3 as shown in the flowchart of FIG. It is confirmed whether or not the gas concentration has reached a predetermined alarm level and an alarm operation is being performed (alarm generation state) (step S1). In step S1, N), the process proceeds to step S19 described later.

  On the other hand, if it is in the alarm generation state (Y in step S1), it is checked whether the patterns of the ports P2 to P4 are OFF, ON, OFF (gas leak alarm state) (step S3), OFF, ON If not OFF (N in step S3), the process proceeds to step S11 described later. If OFF, ON, or OFF (Y in step S3), the inspection signal input from the inspection signal generation circuit 9 to the port P1 is transmitted. It is confirmed whether or not the A / D conversion value is a value when the actual voltage of the voltage signal is in the range of DC11V to 13V (step S5).

  When the A / D conversion value of the inspection signal is a value when the actual voltage of the voltage signal is in the range of DC11V to 13V (Y in step S5), the gas leak indicator 1f is lit red and “ A voice message such as “Is gas leaking?” Is read from the voice IC 5 and sounded (voice output) by the speaker 1g while continuing the gas leak alarm state (step S7), and the process returns to step S1. .

  On the other hand, if the A / D conversion value of the inspection signal is not a value when the actual voltage of the voltage signal is in the range of DC11V to 13V (N in step S5), the gas leak alarm is performed as in step S7. While the state continues, the power indicator 1d blinks rapidly in green, and a voice message such as “There is a voltage abnormality in the output signal” is read from the voice IC 5 and struck (voice output) by the speaker 1g. After the ports P2 to P4 are turned ON, OFF, and OFF (with a voltage abnormal alarm state) so that the voltage of the voltage signal output from 7 is forcibly set to 0 V (step S9), the process proceeds to step S1. Return.

  In step S3, when the pattern of the ports P2 to P4 is not OFF, ON, or OFF (gas leak alarm state) (N), in step S11, the pattern of the ports P2 to P4 is OFF, OFF, ON ( If it is not OFF, OFF, or ON (N in Step S11), the process returns to Step S1, and if it is OFF, OFF, or ON (Y in Step S11), It is confirmed whether or not the A / D conversion value of the test signal input to the port P1 from the test signal generation circuit 9 is a value when the actual voltage of the voltage signal is in the range of DC18V to 22V (step). S13).

  When the A / D conversion value of the inspection signal is a value when the actual voltage of the voltage signal is in the range of DC18V to 22V (Y in step S13), the incomplete combustion gas indicator 1e is lit in yellow. Continues the incomplete combustion alarm state where a voice message such as “Pippopippo is dangerous because the air is dirty. Open the window and ventilate” is read from the voice IC 5 and sounded (sound output) by the speaker 1g. As it is (step S15), the process returns to step S1.

  On the other hand, if the A / D conversion value of the inspection signal is not a value when the actual voltage of the voltage signal is in the range of DC18V to 22V (N in step S13), incomplete combustion is performed as in step S15. While the alarm state continues, the power indicator 1d blinks rapidly in green, and a voice message such as “There is a voltage abnormality in the output signal” is read from the voice IC 5 and is audible (voice output) by the speaker 1g. After the ports P2 to P4 are turned ON, OFF, and OFF (voltage abnormal alarm state) so that the voltage of the voltage signal output from the circuit 7 is forcibly set to 0 V (step S17), step S1 Return to

  Next, in step S1, the alarm operation is performed when the concentration of methane gas or the concentration of carbon monoxide gas calculated from the output of the gas detection circuit 3 reaches the predetermined alarm level in the alarm generation state. In step S19 which proceeds when the state is not in the state (alarm generation state) (N), as shown in the flowchart of FIG. 7, it is determined whether or not the patterns of the ports P2 to P4 are ON, OFF and OFF (failure alarm state). Check.

  If the pattern of the ports P2 to P4 is not ON, OFF, or OFF (N in step S19), the process proceeds to step S27 described later. If the pattern is ON, OFF, or OFF (Y in step S19), the inspection signal generation circuit 9 The A / D conversion value of the inspection signal input to the port P1 is confirmed to be a value when the actual voltage of the voltage signal is in the range of 0V to DC3V (step S21).

  When the A / D conversion value of the inspection signal is a value when the actual voltage of the voltage signal is in the range of 0V to DC3V (Y in step S21), the power indicator 1d blinks rapidly in green, A voice message such as “A failure has occurred” is read from the voice IC 5 and sounded (voice output) by the speaker 1g while continuing the fault alarm state (step S23), and the process returns to step S1 in FIG. To do.

  On the other hand, when the A / D conversion value of the inspection signal is not a value when the actual voltage of the voltage signal is in the range of 0V to DC3V (N in step S21), the power indicator 1d flashes rapidly in green. In addition, after starting a voltage abnormality alarm state in which a voice message such as “There is a voltage abnormality in the output signal” is read from the voice IC 5 and sounded (voice output) by the speaker 1g, or already started Returning to step S1 in FIG. 6 while continuing the voltage abnormality alarm state being continued (step S25).

  In step S19, when the pattern of the ports P2 to P4 is not ON, OFF, or OFF (N), the test signal generation circuit assumes that the patterns of the ports P2 to P4 are OFF, OFF, or OFF in step S19. 9 confirms whether the A / D conversion value of the inspection signal input to the port P1 from 9 is a value when the actual voltage of the voltage signal is in the range of DC5V to 6V.

  When the A / D conversion value of the inspection signal is a value when the actual voltage of the voltage signal is in the range of DC5V to 6V (Y in step S27), the process returns to step S1 in FIG. If the value is not within the range of 6V (N in step S27), the power indicator 1d blinks rapidly in green and a voice message such as “There is a voltage abnormality in the output signal” is read from the voice IC 5 and the speaker. The ports P2 to P4 are turned ON, OFF, OFF (voltage abnormal alarm) so that the voltage of the voltage signal output from the external output circuit 7 is forcibly set to 0 V. State) (step S29), the process returns to step S1 in FIG.

  As is clear from the above description, in the gas alarm device 1 of the present embodiment, steps S1 to S5, step S11, and step S13 in the flowchart of FIG. 6, and steps S19 and S21 in the flowchart of FIG. , And step S27 are processes corresponding to the determination means A in the claims, and steps S9 and S17 in FIG. 6 and steps S25 and S29 in FIG. 7 are in the claims. This process corresponds to the voltage abnormality notification means B.

  In the gas alarm device 1 of the present embodiment configured as described above, a power cord (not shown) is connected to an outlet, and after a standby time of 1 minute, for example, elapses and the gas monitoring operation in the normal mode starts, Operation like this is performed.

  First, the concentration of methane gas calculated from the output of the gas detection circuit 3 according to the resistance value of the sensing element at the end of the high temperature heating period of the heater and the gas according to the resistance value of the sensing element at the end of the low temperature heating period of the heater In a state where none of the carbon monoxide gas concentrations calculated from the output of the detection circuit 3 has reached the alarm level, the following operation is performed.

  When the actual voltage of the voltage signal that should have been output from the external output circuit 7 as a DC6V signal is out of the allowable range of DC5V to 6V, the power indicator 1d blinks rapidly in green and “output” A voice message such as “There is a voltage abnormality in the signal” is sounded (voice output) from the speaker 1g.

  After this time, the voltage of the voltage signal output from the external output circuit 7 in a state where neither the methane gas concentration nor the carbon monoxide gas concentration has reached the alarm level is the three ports of the CPU 11a of the microcomputer 11 By switching the output of P2 to P4 to ON, OFF, and OFF, the original DC 6V is controlled to be forcibly changed to 0V.

  Next, in the state where the concentration of methane gas calculated from the output of the gas detection circuit 3 according to the resistance value of the sensing element at the end of the high-temperature heating period of the heater has reached the alarm level, the external output circuit 7 as a DC12V signal. When the actual voltage of the voltage signal that should have been output from outside the range of DC11V to 13V, which is the allowable range, the power indicator 1d flashes rapidly in green and “There is a voltage abnormality in the output signal.” A voice message such as “Sound” is sounded (voice output) from the speaker 1g.

  After this time, the voltage of the voltage signal output from the external output circuit 7 when the concentration of the methane gas has reached the alarm level turns on the outputs of the three ports P2 to P4 of the CPU 11a of the microcomputer 11. By switching to OFF, OFF, the original DC 12V is controlled to be forcibly changed to 0V.

  Subsequently, in the state where the concentration of carbon monoxide gas calculated from the output of the gas detection circuit 3 according to the resistance value of the sensing element at the end of the low temperature heating period of the heater has reached the alarm level, the signal is externally output as a DC18V signal. When the actual voltage of the voltage signal that should have been output from the output circuit 7 deviates from the allowable range of DC18V to 22V, the power indicator 1d flashes rapidly in green and “the output signal has a voltage abnormality. "There is a voice message" or the like is sounded (voice output) from the speaker 1g.

  After this time, the voltage of the voltage signal output from the external output circuit 7 in a state where the concentration of the carbon monoxide gas has reached the alarm level is applied to the three ports P2 to P4 of the CPU 11a of the microcomputer 11. By switching the output to ON, OFF, and OFF, the original DC 18V is controlled to be forcibly changed to 0V.

  In addition, when the gas alarm device 1 breaks down such as disconnection of the gas detection circuit 3, the actual voltage of the voltage signal that should be output from the external output circuit 7 as a 0V signal is within the allowable range of 0V to DC3V. When out of the range, the power indicator 1d blinks rapidly in green, and a voice message such as “Failure has occurred” is sounded (voice output) from the speaker 1g.

  When the actual voltage of the voltage signal is out of the allowable range, the cause is that the voltage signal to be output depends on the combination of the ON / OFF states of the three ports P2 to P4 of the CPU 11a of the microcomputer 11. In the case of a failure such as a relay in the external output circuit 7 that switches the voltage of the voltage, the voltage of the voltage signal output from the external output circuit 7 is forcibly changed from the original DC 12V to 0V. As described above, even when the CPU 11a of the microcomputer 11 switches the output of the three ports P2 to P4 to ON, OFF, and OFF, the voltage of the voltage signal actually output from the external output circuit 7 is 0V (0V to DC3V). May not be changed.

  However, even in that case, the green blinking of the power indicator 1d and the sounding (voice output) of the voice message such as “There is a voltage abnormality in the output signal” from the speaker 1g are surely executed.

  As described above, according to the gas alarm device 1 of the present embodiment, when the voltage of the voltage signal output from the external output circuit 7 is out of the allowable range, the fact that the power indicator 1d flashes rapidly or the speaker 1g Since it is notified to the outside by the output of the voice message, if the voltage of the voltage signal rises or falls beyond the allowable range due to an internal failure of the external output circuit 7 or the like, the voltage signal becomes 0 V at the time of the failure. Even if not, it is possible to notify the outside that the gas alarm device 1 is out of order by blinking the power indicator 1d or outputting a voice message from the speaker 1g.

  In the above-described embodiment, the microcomputer 11 and the external output circuit 7 are connected by wire. For example, FIG. 8 is a circuit diagram of the inspection signal generation circuit of the gas alarm device according to the second embodiment of the present invention. As shown, the ports P2 to P4 of the CPU 11a and the external output circuit 7 are connected by the light emitting diodes LED2 to LED4 on the CPU 11a side constituting the photocoupler and the phototransistors PT2 to PT4 on the external output circuit 7 side. The microcomputer 11 is insulated from the external output circuit 7 by connecting the port P1 and the signal output line of the external output circuit 7 with the light emitting diode LED1 on the external output circuit 7 side and the phototransistor PT1 on the CPU 11a side that constitute the photocoupler. It can also be configured.

  However, if the microcomputer 11 is insulated from the external output circuit 7, the external output circuit 7 and the microcomputer 11 are individually grounded, so that the same ground potential cannot be ensured. As a result, the output is output from the external output circuit 7. Since the CPU 11a does not have an A / D conversion value corresponding to the ground potential on the external output circuit 7 side even if the voltage of the voltage signal is A / D converted by the CPU 11a of the microcomputer 11 and taken in, the voltage of the voltage signal Cannot be acquired accurately by the CPU 11a.

  Therefore, in the inspection signal generation circuit 9 of the gas alarm device 1 according to the second embodiment, the comparator / logic circuit 15 is inserted between the resistors R1, R2 and the photocoupler, and the inspection signal is generated by the comparator / logic circuit 15. The CPU 11a of the microcomputer 11 fetches only the result of the determination, and the power indicator 1d blinks at high speed to notify the voltage abnormality of the voltage signal or from the speaker 1g. The voice message is output exclusively to the CPU 11a.

  Here, as shown in the circuit diagram of FIG. 9, the comparator / logic circuit 15 includes four inspection units 15a to 15d for 0V, DC6V, DC12V, and DC18V. 15a includes an upper limit determination comparator 15ah, and the other inspection units 15b to 15d include upper limit determination comparators 15bh, 15ch, and 15dh and lower limit determination comparators 15bl, 15cl, and 15dl. Each is provided, and includes logical OR negation circuits NOR1 to NOR4 for determination outputs of the respective inspection units 15a to 15d, and logical OR negation circuit NOR5 for overall determination output.

  Connections of resistors R11, R12, resistors R21, R22, resistors R31, R32, R41, R42 connected in series are connected to the negative terminals of the comparators 15ah, 15bh, 15ch, 15dh for determining the upper limit value of each inspection unit 15a-15d. Upper limit values of test signals for 0V, DC6V, DC12V, and DC18V appearing at points a11, a21, a31, and a41 are input, and test signals amplified by the amplifier AMP are input to the + terminal. .

  Further, the positive terminals of comparators 15bl, 15cl, and 15dl for determining the lower limit value of each inspection unit 15b to 15d are connected to connection points a22, a32 of resistors R22, R23, resistors R32, R33, R42, R43 connected in series. The lower limit values of the test signals for 0V, DC6V, DC12V, and DC18V appearing at a42 are input, and the test signal amplified by the amplifier AMP is input to the negative terminal.

  In the comparator / logic circuit 15 configured as described above, when the voltage of the voltage signal is within the allowable ranges of 0V, DC6V, DC12V, and DC18V, only the corresponding inspection units 15a to 15d are used for determining the upper limit value. The outputs of the comparators 15ah, 15bh, 15ch, and 15dh and the outputs of the comparators 15bl, 15cl, and 15dl for determining the lower limit value are all “L”, and the other three inspection units 15a to 15d are for determining the upper limit value. One of the outputs of the comparators 15ah, 15bh, 15ch, and 15dh and the outputs of the comparators 15bl, 15cl, and 15dl for determining the lower limit value is “L” and the other is “H”, and the logical sum negation circuit NOR1 Since only one output of -NOR4 is "H" and the remaining three are "L", the logical sum negation circuit NOR The output of the becomes "L".

  On the other hand, if the voltage of the voltage signal exceeds the upper limit value of each allowable range of 0V, DC6V, DC12V, DC18V, or the voltage of the voltage signal falls below the lower limit value of each allowable range of DC6V, DC12V, DC18V, Similarly to the other three inspection units 15a to 15d, the output of the upper limit value determination comparators 15ah, 15bh, 15ch, and 15dh, and the lower limit value determination are also performed for the inspection units 15a to 15d corresponding to the abnormal voltage. Since one of the outputs of the comparators 15bl, 15cl, and 15dl is “L” and the other is “H”, and the outputs of all the logical sum negation circuits NOR1 to NOR4 are “L”, the logical sum negation circuit NOR5 Is inverted to “H”.

  Therefore, as the operation of the inspection signal generation circuit 9, the light-emitting diode LED1 of the comparator / logic circuit 15 is extinguished while the voltage is within an allowable range for any voltage signal of 0V, DC6V, DC12V, and DC18V. The phototransistor PT1 is in a non-conductive state and the input of the port P1 of the CPU 11a is “H”. However, when an abnormality occurs in the voltage of the voltage signal, the light emitting diode LED1 is turned on and the phototransistor is turned on. Due to the conduction of PT1, the input of the port P1 of the CPU 11a becomes “L”.

  Therefore, in the gas alarm device 1 according to the second embodiment, the CPU 11a of the microcomputer 11 performs processing related to the monitoring of the voltage of the voltage signal performed according to the control program stored in the ROM 11c, and the input of the port P1 of the CPU 11a is “H”. And a power indicator similar to step S9 and step S17 in FIG. 6 and step S25 and step S29 in FIG. 7 performed when the input of the port P1 of the CPU 11a is “H”. 1d blinks rapidly in green, and a voice message such as “There is a voltage abnormality in the output signal” is read from the voice IC 5 and rang (voice output) by the speaker 1 g, and a voltage signal output from the external output circuit 7 Ports P2 to P4 are turned ON, OFF, OFF (with voltage) so that the voltage of It is changed to a normal alarm condition) processes.

  In the gas alarm device 1 according to the second embodiment, the CPU 11a of the microcomputer 11 confirms whether or not the input of the port P1 of the CPU 11a is “H”, and the comparator / logic of the inspection signal generation circuit 9 The circuit 15 constitutes the determining means A in the claims.

  Further, in the gas alarm device 1 according to the second embodiment, the power indicator 1d blinks in green at a high speed when the input of the port P1 of the CPU 11a is “H”, and “the output signal has a voltage abnormality. Is read out from the voice IC 5 and ringed (voice output) by the speaker 1g, and the ports P2 to P4 are set so that the voltage of the voltage signal output from the external output circuit 7 is forcibly set to 0V. Steps S9 and S17 in FIG. 6 and steps in FIG. 7 are performed by the CPU 11a of the microcomputer 11 in the gas alarm device 1 of the first embodiment. Similar to S25 and step S29, the processing corresponds to the voltage abnormality notification means B in the claims.

  Also with the gas alarm device 1 according to the second embodiment configured as described above, the same effect as that of the gas alarm device 1 according to the first embodiment can be obtained.

  In addition, in the gas alarm device 1 of each embodiment mentioned above, the case where the alerting | reporting when abnormality occurred in the voltage of a voltage signal was demonstrated with both the display and sound of the lighting display of an indicator and sounding of a voice message was demonstrated. However, either one of them may be notified, and the notification performed by the indicator is performed by blinking of the power indicator 1d as in the gas alarm device 1 of each embodiment described above. The alarm display of the incomplete combustion state and the gas leakage state by the incomplete combustion gas indicator 1e and the gas leak indicator 1f can be executed in parallel with the display of the voltage abnormality of the voltage signal.

  In addition, the abnormal voltage display of the voltage signal is indicated by a fast flashing red of the gas leak indicator 1f when not in a gas leak alarm state, or a fast flashing of yellow of the incomplete combustion gas indicator 1e when not in an incomplete combustion alarm state. Alternatively, the power indicator performed in the gas alarm device 1 of the first and second embodiments, such as fast flashing in green, yellow, and red by all of the power indicator 1d, the incomplete combustion gas indicator 1e, and the gas leak indicator 1f You may make it carry out in the form different from the high-speed blink by 1d green.

  Furthermore, although the configuration for controlling the voltage of the abnormal voltage signal to be forced to 0 V may be omitted, the voltage of the abnormal voltage signal in which the abnormality has occurred can be omitted as in the above-described embodiment. If a configuration for controlling to 0 V forcibly is provided, what kind of abnormality has occurred on the receiving side of the voltage signal, such as when receiving a voltage signal having a voltage within the allowable range. Even if it is not possible to determine whether or not it is, it is not possible to grasp the occurrence of abnormality itself because it receives a voltage signal with a voltage outside the allowable range, but some abnormality such as gas leakage or incomplete combustion This is advantageous compared to the case where such a configuration is not provided.

  Moreover, in the gas alarm device 1 of each embodiment mentioned above, it is discriminate | determined from the inspection signal which divided the voltage signal with resistance R1, R2 and made it the small voltage whether the voltage of the voltage signal was out of the allowable range. Although the configuration has been described, if the circuit configuration can detect the voltages of all the voltage signals as they are, it may be determined by using the voltage signals as they are as the inspection signals.

It is a basic block diagram of the alarm device of this invention. It is a front view of the gas alarm which concerns on 1st Embodiment of this invention. It is a block diagram which shows the electrical schematic structure of the gas alarm device of FIG. FIG. 4 is a circuit diagram showing an example of a specific configuration of the external output circuit of FIG. 3. It is explanatory drawing which shows the allowable range of a voltage signal. It is a flowchart which shows the process which CPU performs according to the control program stored in ROM of the microcomputer of FIG. It is a flowchart which shows the process which CPU performs according to the control program stored in ROM of the microcomputer of FIG. It is a circuit diagram of the inspection signal generation circuit of the gas alarm which concerns on 2nd Embodiment of this invention. FIG. 9 is a circuit diagram illustrating an example of a specific configuration of the comparator / logic circuit of FIG. 8.

Explanation of symbols

9 Inspection signal generation means A Determination means B Voltage abnormality notification means

Claims (2)

When an alarm condition occurs on a monitoring target such as gas or incomplete combustion, a voltage signal with a different voltage for each alarm condition generated is generated based on the command signal of the pattern corresponding to the alarm condition that occurred. In the alarm device that outputs to
Inspection signal generation means for generating an inspection signal having a voltage corresponding to the voltage of the voltage signal;
The voltage corresponding to the normal voltage of the voltage signal corresponding to the pattern of the command signal that is the basis of the generation of the voltage signal corresponding to the inspection signal, or the allowable range around it Determining means for determining whether or not the voltage band is matched,
The voltage corresponding to the normal voltage of the voltage signal corresponding to the pattern of the command signal that is the basis of the generation of the voltage signal corresponding to the inspection signal, or the allowable range around it A voltage abnormality notifying means for performing a notification operation for notifying the outside of the voltage signal voltage abnormality when the determination means determines that the voltage band does not match ,
The voltage signal is output to the outside at a voltage different from that at the occurrence of the alarm state to be monitored when a failure occurs,
The determination means further determines whether or not the voltage of the inspection signal matches a voltage corresponding to the voltage of the voltage signal at the time of the failure or a voltage band within an allowable range before and after the voltage,
The voltage abnormality notifying means further determines that the voltage of the inspection signal matches a voltage according to a voltage of the voltage signal at the time of the failure or a voltage band within an allowable range before and after the voltage. An alarm device characterized by notifying the outside of the occurrence of a failure when the means determines, and notifying the outside of the voltage of the voltage signal when it is determined that they do not match . Before SL voltage abnormality notification means, the voltage of the test signal, corresponding to the pattern of the command signal which is the basis of generation of the chromatic voltage signal corresponding to the test signal, depending on the normal voltage of the chromatic voltage signal If the determination means determines that the detected voltage or the voltage range within the allowable range before and after the detected voltage is not met, the voltage signal that is forcibly changed to the voltage at the time of the failure is output to the outside. The alarm device of Claim 1 comprised by these.

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