JP2010102487A - Alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alarm for correcting the deviation of transmission/reception timings while suppressing a current consumption amount. <P>SOLUTION: This alarm is provided with: a temperature detection circuit 10 which detects a temperature near a clock generator 12; and a storage element 13 for storing an initialization count number (131) as a count number per the unit time of a clock signal, an initialization temperature 132 corresponding to the initialization count number (131) and temperature characteristic information 133 of the clock generator 12. A transmission/reception part 5 transmits a status signal while repeating a transmission time and a transmission quiescent time in every transmission cycle to the other equipment, and receives the status signal transmitted from the other equipment in every intermittent reception cycle, and a control circuit 1 corrects the transmission/reception timing of the transmission/reception part 5 according to the result of comparison of the detection temperature of the temperature detection circuit 10 and the initialization temperature 132. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an alarm device that transmits and receives status signals and the like between a plurality of devices.

  There is an alarm device that detects the heat and smoke generated in the room and gives an alarm. Among such alarm devices, there are those in which each alarm device performs an alarm operation independently, but there are those in which a plurality of alarm devices provided in each room are linked to perform an alarm operation.

  In such a transmission system when a plurality of alarm devices perform an interlocking operation, “a wireless transmission system including a plurality of wireless devices and transmitting wireless signals between the plurality of wireless devices, The wireless device having at least one of transmitting means for transmitting a wireless signal or receiving means for receiving a wireless signal and a battery for supplying power commonly has a predetermined event. Sometimes the transmission means is activated to transmit a radio signal during a predetermined transmission period and alternately repeat the operation of stopping transmission of the radio signal during a predetermined pause period, and stop the transmission means when the event does not occur A radio having a transmission control unit and a reception unit includes a timer unit that repeatedly counts a certain intermittent reception interval, and a count of the intermittent reception interval by the timer unit. And receiving control means for starting the receiving means every time counting of the intermittent reception interval by the timer means is completed, and intermittently when the transmission period is a and the pause period is b. There is proposed a technique in which values a and b satisfying a + 2b <T and 2a + b> T are set in a transmission period and a pause period, respectively, under the condition that the reception interval T is T> a (for example, Patent Literature 1).

JP 2008-176515 A (Page 4, FIGS. 1 and 2)

  In the conventional transmission system, if the transmission / reception timings of the respective radio devices are all matched, the necessary information can be transmitted / received to / from each other by performing the transmission processing in accordance with the timing at which all the radio devices perform the reception processing, Building a system is very easy. In addition, if all the transmission / reception timings match, necessary information can be transmitted / received without repeatedly transmitting / receiving, and current consumption required for transmission / reception can be reduced.

  However, the transmission / reception timing of each wireless device is often determined by an electronic component such as a clock generator, and such an electronic component has a characteristic that the clock frequency changes with temperature. When the clock frequency changes, a shift occurs in the transmission / reception timing of each wireless device, so correction is necessary to prevent the shift.

  Here, in general, there is a technique for correcting a timing shift by separately performing wireless communication for adjusting transmission / reception timing. However, if wireless communication is performed separately, the amount of current consumption increases. Therefore, for example, in a wireless device driven by a battery as a power source, there is a problem that the battery life is shortened.

  The present invention has been made to solve the above-described problems, and provides an alarm device capable of correcting a shift in transmission / reception timing while suppressing the amount of current consumption.

  An alarm device according to the present invention includes a state detection unit, a state determination unit that determines a state based on an output signal of the state detection unit, a control unit that outputs an alarm based on a determination result of the state determination unit, A temperature at which a temperature near the clock generator is detected in an alarm device comprising: a transmission / reception unit that transmits / receives a status signal to / from another device at a transmission / reception timing controlled by a clock signal of the clock generator of the control unit A detection unit; and a storage unit that stores a count number of the clock signal at a predetermined time and a reference temperature corresponding to the count number, and the transmission / reception unit transmits a status signal to another device for each transmission period. While repeatedly transmitting the transmission time and the transmission pause time, the state signal transmitted by another device is received every intermittent reception period, and the control unit detects the temperature detected by the temperature detection unit and the reference And it corrects the reception timing of the transmitting and receiving unit according to a result of comparing the degree.

  In addition, another alarm device according to the present invention outputs a warning based on a state detection unit, a state determination unit that determines a state based on an output signal of the state detection unit, and a determination result of the state determination unit In an alarm device comprising: a control unit; and a transmission / reception unit that transmits / receives a status signal to / from another device at a transmission / reception timing controlled by a clock signal of a clock generator of the control unit, the clock generation at a predetermined period A temperature detection unit that detects a temperature in the vicinity of the vessel, and a storage unit that stores a count number of the clock signal at a predetermined time, a reference temperature corresponding to the count number, and a detection temperature of the temperature detection unit, The transmitter / receiver repeatedly transmits a transmission state signal and a transmission suspension time for each transmission period to another device, while receiving a state signal transmitted by another device for each intermittent reception cycle, Serial control unit is configured to correct the transmission and reception timings in accordance with a result of comparing the detected temperature of the current temperature detector and the temperature detected in the past of the temperature detecting portion.

  Since the alarm device according to the present invention corrects the transmission / reception timing of the transmission / reception unit based on the detected temperature of the temperature detection unit, the reference temperature, and the temperature characteristic information, transmission / reception between devices while suppressing current consumption. Timing deviation can be prevented.

  Further, the other alarm device according to the present invention corrects the transmission / reception timing of the transmission / reception unit based on the reference temperature, the detection temperature of the current temperature detection unit, the detection temperature of the past temperature detection unit, and the temperature characteristic information. Therefore, it is possible to prevent a transmission / reception timing shift between devices while suppressing current consumption, and to shorten a processing time required for correction of the transmission / reception timing.

Embodiment 1 FIG.
Hereinafter, in the first embodiment, a case where the present invention is applied to a fire alarm device that is driven by a battery and performs wireless communication will be described as an example.

  The fire alarm device 100 according to the first embodiment is wirelessly communicated with another fire alarm device 100n (not shown in the drawings to be described later) installed in, for example, an adjacent room, and is mutually connected by wireless communication. It can send and receive state information and the like.

  FIG. 1 is a functional block diagram showing a main configuration of a fire alarm device according to Embodiment 1 in which the book is not a cane. In FIG. 1, a fire alarm 100 includes a control circuit 1, a battery 2, a power supply circuit 3, a battery voltage detection circuit 4, a transmission / reception circuit 5, a fire detection circuit 6, an alarm sound control circuit 8, an indicator light circuit 9, and a temperature detection circuit. 10 is provided.

  The battery 2 supplies DC power to the power supply circuit 3. The power supply circuit 3 controls the voltage of the battery 2 to a predetermined voltage and supplies it to the control circuit 11 transmission / reception circuit 5, fire detection circuit 7, alarm sound control circuit 8, and indicator lamp circuit 9.

  The battery voltage detection circuit 4 detects the voltage of the battery 2 applied to the power supply circuit 3 and outputs a battery voltage detection signal corresponding to the detected voltage to the control circuit 1.

The control circuit 1 includes a CPU 11, a clock generator 12 that supplies a clock signal to the CPU 11, and a storage element 13 that stores various kinds of information. The CPU 11 is connected to the temperature detection circuit 10.
The clock generator 12 generates a clock signal having a predetermined clock frequency using a crystal oscillator, a ceramic oscillator, or the like. The clock generator 12 has a temperature characteristic that the frequency of the clock signal changes depending on the ambient temperature.

The storage element 13 is composed of an unexpected volatile memory such as an EEPROM.
FIG. 2 is a block diagram illustrating a data configuration of information stored in the storage element 13. The storage element 13 stores an initial set count number 131, an initial set temperature 132, and temperature characteristic information 133, which are stored at the time of factory shipment.
The initial set count number 131 is an initial value of the count number per reference time of the clock signal generated by the clock generator 12, and the initial set temperature 132 is the area around the clock generator 12 corresponding to the initial set count number 131. Temperature.
The temperature characteristic information 133 is information indicating the correspondence between the number of counts per reference time of the clock signal generated by the clock generator 12 and the temperature. The temperature characteristic information 133 is given by a count number / temperature correspondence table or a calculation formula representing a correspondence relationship between the count number and temperature based on characteristics unique to each oscillator. In the following description, the count number and temperature given by the temperature characteristic information 133 are referred to as “count number X” and “temperature Y”, respectively.

  The temperature detection circuit 10 is composed of a thermistor or the like, detects the ambient temperature of the clock generator 12, and outputs a signal corresponding to the detection result to the CPU 11. In the following description, the ambient temperature of the clock generator 12 detected by the temperature detection circuit 10 is referred to as “ambient temperature y”.

  The fire detection circuit 7 detects a physical change such as smoke or heat based on the fire phenomenon and outputs a signal corresponding to the detected content to the control circuit 1. The alarm sound control circuit 8 is a circuit for controlling the sounding operation by a buzzer / speaker or the like. The indicator lamp circuit 9 is a circuit that controls the lighting operation of indicator lamps such as light emitting diodes. When the fire detection circuit 7 detects a fire or abnormality, a signal corresponding to the detected content is output to the control circuit 1. Based on the signal output from the fire detection circuit 7, the control circuit 1 controls the alarm sound control circuit 8 and the indicator lamp circuit 9 to give an alarm by sound and indicator lamp.

  The transmission / reception circuit 5 transmits / receives state information and the like by radio signals via the antenna 6. The control of the transmission timing and the reception timing is performed by the control circuit 1 based on the count number of the clock signal generated by the clock generator 12. For example, the CPU 11 counts clock signals, and when the counted number reaches “count number x”, transmission or reception is performed using this as a reference unit. In the following description, the count number serving as a reference for transmission / reception timing is referred to as “count number x”.

In the transmission operation, the standard defines a time during which radio signals can be transmitted continuously (transmission time) and a period during which radio signals should not be transmitted (transmission pause time). When performing transmission, necessary information is transmitted to the other fire alarm device 100n by repeatedly performing a transmission time and a transmission suspension time a predetermined number of times (for example, three times).
In the reception operation, the reception function is activated at every predetermined intermittent reception interval, and if a radio signal transmitted by another fire alarm 100n is captured, it is received, and if it is not captured, it is not received. . Thus, by starting the reception function at every intermittent reception interval, the current consumption required for the reception operation can be reduced.

When the fire detection circuit 7 detects a fire or abnormality, the transmission / reception circuit 5 configured as described above transmits state information regarding the fire or abnormality to the other fire alarm device 100n as an interlocking signal.
In addition, when an interlock signal is transmitted from another fire alarm device 100n, the interlock signal is received.
Even if no fire or abnormality is detected, the status is confirmed by periodically transmitting / receiving self-identification information, status information on battery voltage, etc. to / from other fire alarms 100n. .

  Here, since the fire alarm device 100 needs to reliably receive the information transmitted by the other fire alarm devices 100n, it is necessary to match the timing of the transmission time with the reception timing. That is, it is necessary to activate the reception function of the fire alarm device 100 during the transmission time of the other fire alarm device 100n. The control of the transmission timing and the reception timing is performed by the control circuit 1 based on the count number of the clock signal. As described above, the clock generator 12 has a temperature characteristic that the clock frequency changes depending on the ambient temperature. . Therefore, when the clock frequency of the clock generator 12 changes, there may be a case where information cannot be reliably transmitted / received due to a shift in transmission / reception timing. In the first embodiment, transmission / reception timing is corrected so that state information and the like can be reliably transmitted and received.

FIG. 3 is a flowchart showing a transmission / reception timing correction process.
In FIG. 3, when the battery 2 is turned on (S20), the CPU 11 reads the initial set count number 131 stored in the storage element 13 and initializes it as the count number x (S21).

  The temperature detection circuit 10 detects the ambient temperature y of the clock generator 12, and outputs a signal corresponding to the detected ambient temperature y to the CPU 11 (S22).

  The CPU 11 compares the ambient temperature y detected in step S22 with the initial set temperature 132 stored in the storage element 13 (S23).

  When there is a difference between the ambient temperature y and the initial set temperature 132, the count number X corresponding to the ambient temperature y is obtained with reference to the temperature characteristic information 133, and the count number X is corrected to be the count number x ( S24). In this case, the transmission timing and reception timing of the transmission / reception circuit 5 are determined based on the corrected count number x until the next temperature measurement timing. For example, when the ambient temperature of the place where the fire alarm 100 is installed is different from the ambient temperature of the place where the other fire alarm 100n is installed, the clock frequency of the clock generator 12 is also different. Since the reference count number x is corrected, it is possible to prevent the transmission / reception timing from being shifted.

  When there is no difference between the ambient temperature and the initial set temperature 132 in step S23, or when the process of step S24 is completed, the process waits until the next temperature measurement timing (S25), and thereafter, the process proceeds from step S22 to step S25. Repeat the process. The temperature measurement timing is repeated every predetermined time interval, and the transmission / reception timing is determined using the latest correction count number x until the next temperature measurement timing.

  As described above, the count number x of the clock signal is corrected based on the ambient temperature detected by the temperature detection circuit 10, and the transmission / reception timing is controlled based on the corrected count number x. It is possible to prevent a shift in transmission / reception timing between them. Further, unlike the prior art, it is not necessary to separately perform wireless communication in order to correct the transmission / reception timing, so that the amount of current consumption can be reduced. Therefore, for example, in a battery-powered alarm device, the battery replacement time can be delayed.

Embodiment 2. FIG.
FIG. 4 is a block diagram showing a data configuration of information stored in the storage element 13A according to Embodiment 2 of the present invention. FIG. 5 is a flowchart showing a transmission / reception timing correction process of the fire alarm device according to the second embodiment of the present invention. The fire alarm device according to the second embodiment is different from the first embodiment in that the storage device 13A is provided instead of the storage device 13 according to the first embodiment, and the transmission / reception timing correction process is different. Hereinafter, a description will be given based on FIGS. 4 and 5 with a focus on differences from the first embodiment.

In FIG. 4, the storage element 13 </ b> A stores an initial set count number 131, an initial set temperature 132, temperature characteristic information 133, and a past ambient temperature 134.
The past ambient temperature 134 is, for example, the ambient temperature y of the clock generator 12 detected by the temperature detection circuit 10 immediately before or five times before, and is updated at a predetermined cycle.

  Next, transmission / reception timing correction processing will be described with reference to FIG. In FIG. 5, steps S30 to S34 correspond to steps S20 to S24 described in the first embodiment, respectively, and the same processing is performed.

  When there is no difference between the ambient temperature y and the initial set temperature 132 in step S33, or when the process of step S34 is completed, the storage element 13A is set as the past ambient temperature 134 with the ambient temperature y measured in step S32 as the past ambient temperature 134. (S35). When the temperature measurement timing is reached (S36), the temperature detection circuit 10 detects the current ambient temperature y of the clock generator 12, and outputs a signal corresponding to the detected temperature to the CPU 11 (S37). In addition, the temperature detection process in step S37 is the same process as step S32.

  The CPU 11 compares the ambient temperature y detected in step S37 with the past ambient temperature 134 stored in the storage element 13A, and detects whether there is a change in the ambient temperature y (S38).

When there is a difference between the ambient temperature y and the past ambient temperature 134, the count number X corresponding to the ambient temperature y is obtained with reference to the temperature characteristic information 133, and correction is performed with the count number X as the count number x. (S39).
Here, instead of obtaining the count number X with reference to the temperature characteristic information 133, the count number X is obtained by adding or subtracting the count number corresponding to the difference value between the ambient temperature y and the past ambient temperature 134. May be. By doing in this way, since it is not necessary to refer to the temperature characteristic information 133, the processing time can be shortened.

  If there is no change in the ambient temperature y in step S38, the process returns to step S35, and the storage element 13A is updated with the ambient temperature y detected in step S37 as the past ambient temperature 134.

  That is, in the second embodiment, the transmission / reception timing is corrected only when there is a change in the ambient temperature y compared to the past, and the correction is not performed when there is no change.

  Thus, according to the second embodiment, the count number x of the clock signal is corrected based on the ambient temperature y detected by the temperature detection circuit 10, and transmission / reception is performed based on the corrected count number x. The same effects as those of the first embodiment can be obtained.

  Further, the past ambient temperature y is stored in the storage element 13A, and the transmission / reception timing is corrected only when there is a change from the past ambient temperature y. For this reason, it is not necessary to correct the transmission / reception timing each time the ambient temperature y is detected, and the processing time required for the correction can be shortened.

  In each embodiment, an example in which the transmission time and the transmission pause time are repeated a plurality of times in the transmission operation of the transmission / reception circuit 5 has been described.

  In the above description, the case where the present invention is applied to a fire alarm device that is driven by a battery and performs wireless communication has been described as an example. However, the power supply method and communication method are not limited, and a fire alarm is provided. It is also possible to apply to alarm devices other than alarm devices.

It is a functional block diagram of the fire alarm which shows Embodiment 1 of this invention. It is a block diagram of the memory element of the fire alarm. It is a flowchart which shows the correction process of the transmission / reception timing of the fire alarm. It is a block diagram of the memory element of the fire alarm which shows Embodiment 2 of this invention. It is a flowchart which shows the correction process of the transmission / reception timing of the fire alarm.

Explanation of symbols

  1 control circuit, 2 battery, 3 power supply circuit, 4 battery voltage detection circuit, 5 transmission / reception circuit, 6 antenna, 7 fire detection circuit, 8 alarm sound control circuit, 9 indicator light circuit, 10 temperature detection circuit, 11 CPU, 12 clock Generator, 13, 13A Memory element, 131 Initial count number, 132 Initial set temperature, 133 Temperature characteristic information, 134 Past ambient temperature, 100 Fire alarm, 100n Other fire alarm.

Claims (2)

A state detector;
A state determination unit that determines a state based on an output signal of the state detection unit;
A control unit that outputs an alarm based on the determination result of the state determination unit;
A transmission / reception unit that transmits / receives a state signal to / from another device at a transmission / reception timing controlled by a clock signal of a clock generator of the control unit;
In an alarm device comprising:
A temperature detector for detecting the temperature in the vicinity of the clock generator;
A storage unit that stores a count number of the clock signal at a predetermined time and a reference temperature corresponding to the count number;
The transmitter / receiver repeatedly transmits a transmission state signal and a transmission suspension time for each transmission period to another device, while receiving a state signal transmitted by another device for each intermittent reception cycle,
The said control part correct | amends the transmission / reception timing of the said transmission / reception part according to the result of having compared the detected temperature of the said temperature detection part, and the said reference temperature, The alarm device characterized by the above-mentioned. A state detector;
A state determination unit that determines a state based on an output signal of the state detection unit;
A control unit that outputs an alarm based on the determination result of the state determination unit;
A transmission / reception unit that transmits / receives a state signal to / from another device at a transmission / reception timing controlled by a clock signal of a clock generator of the control unit;
In an alarm device comprising:
A temperature detection unit for detecting the temperature in the vicinity of the clock generator every predetermined period;
A storage unit that stores a count number of the clock signal at a predetermined time, a reference temperature corresponding to the count number, and a detection temperature of the temperature detection unit;
The transmitter / receiver repeatedly transmits a transmission state signal and a transmission suspension time for each transmission period to another device, while receiving a state signal transmitted by another device for each intermittent reception cycle,
The said control part correct | amends the said transmission / reception timing according to the result of having compared the detection temperature of the present temperature detection part with the detection temperature of the past temperature detection part, The alarm device characterized by the above-mentioned.

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