KR101467165B1 - Wireless Fire Alariming System and method thereof - Google Patents

Abstract

The present invention relates to a wireless fire alarm system, and a wireless temperature warning device, a wireless temperature sensor, and the like.
The present invention provides a wireless communication system including at least one wireless temperature sensor for measuring a temperature and wirelessly providing the temperature periodically, and a wireless communication unit for wirelessly connecting the at least one wireless temperature sensor to the at least one wireless temperature sensor, And a wireless temperature warning device for outputting a temperature alarm.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a wireless fire alerting system,

The present invention relates to a wireless fire alarm system, and a wireless temperature warning device, a wireless temperature sensor, and the like.

There are many cases where a fire occurs due to overheating of hot air balloons at home or at a store. These hot air heaters cause a fire, and if a fire already occurs, it will be difficult to quell it. If there is a man and a suppressor in the vicinity, a significant damage will already occur.

In particular, when going outdoors while using a gas heater or a heating device in a private home or an apartment, a fire is generated due to the overheating of the hot air balloon, and in many cases, premature fire suppression becomes impossible. Of course, when smoke detectors or heat detectors are installed in apartment buildings, smoke is emitted and the sprinkler installed in the ceiling automatically injects water to quench the fire. However, since the fire has already occurred, it should take considerable damage.

Furthermore, when there is no automatic fire extinguishing device such as a private home or a private shop, it is necessary to manually rely on a fire extinguisher, so it is not easy to detect a fire caused by overheating of the hot air balloon early and to suppress the fire. Normally, if a fire occurs, the use of a fire extinguisher is not well known. Also, fire caused by oil or gas is especially difficult to suppress early fire. In such a case, if there is a method capable of continuously monitoring the overheating state of the hot air balloon, it is possible to prevent the fire in advance.

In particular, when a person goes out while using a hot air balloon, such as an oven, a fire occurs due to overheating of the hot air balloon or other causes, and there is no person to suppress the fire, leading to a large disaster. In this case, even if an alarm is triggered by a fire detection device or the like, it is impossible to take action and the fire can not be generated.

Korean Published Patent Application No. 2007-0018485 (filed on August 10, 2005)

SUMMARY OF THE INVENTION The present invention provides a means for preventing a heating device from being overheated through constant monitoring of the heating device and preventing a fire from occurring when the heating device is turned on and off unintentionally.

The present invention relates to a wireless fire alarm system, and a wireless temperature warning device, a wireless temperature sensor, and the like. The present invention provides a wireless communication system including at least one wireless temperature sensor for measuring a temperature and wirelessly providing the temperature periodically, and a wireless communication unit for wirelessly connecting the at least one wireless temperature sensor to the at least one wireless temperature sensor, And a wireless temperature warning device for outputting a temperature alarm.

On the basis of the method and the configuration according to the present invention, the overheat state of the heat transfer mechanism can be continuously monitored at all times, and a fire can be prevented in advance by taking measures in advance.

FIG. 1 is a block diagram illustrating a wireless electric heater operation sensing apparatus according to a preferred embodiment of the present invention. Referring to FIG.
2 is a block diagram showing a wireless temperature warning device according to a preferred embodiment of the present invention.
3 is a block diagram showing a detailed configuration of a wireless temperature sensor according to a preferred embodiment of the present invention.
4 is a flowchart illustrating an operation of a wireless temperature sensor according to an exemplary embodiment of the present invention.
FIG. 5 is a flowchart illustrating a method of estimating arrival time of a received packet in a wireless temperature warning device according to an exemplary embodiment of the present invention.
6 is a flowchart illustrating a low power mode algorithm of a wireless temperature warning device and a wireless temperature sensor according to a preferred embodiment of the present invention.
7 is a timing chart of wireless packet transmission / reception between transceivers according to a preferred embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

FIG. 1 is a block diagram illustrating a wireless electric heater operation sensing apparatus according to a preferred embodiment of the present invention. Referring to FIG. 2 is a block diagram showing a wireless temperature warning device according to a preferred embodiment of the present invention.

1 and 2, the wireless temperature warning device according to the present invention includes both a one-to-one wireless communication system and a one-to-N wireless communication system.

In a one-to-one or one-to-N wireless communication system, a wireless temperature warning device 10 uses radio frequency temperature sensors (e.g., 11-1 to 11-3) 1 wireless communication at all times, and the temperature information from the sensors 11-1 through 11-3 is stored and grasped at all times. When these sensors 11-11 exceed a predetermined temperature threshold, the wireless temperature warning device 10 causes the buzzer 22 or the LED 23 to generate a warning sound or blink to indicate that there is an abnormality in the wireless electric heater Let the user know. In the one-to-N wireless communication system, the RF transceiver 24 is always operated to always detect a radio signal transmitted from each of the sensors 11-1 to 11-3 at a certain time.

In the case where the user can not receive the reference transmission packet from the indoor wireless temperature sensors 11-1 to 11-3 when the user carries out the wireless temperature warning device 10 and goes out, To receive a reference packet from the device using an embedded or separate reference packet transmission device. In this case, when the user returns home, the wireless temperature warning device 10 must return to the communication state with the indoor wireless temperature sensors 11-1 to 11-3. Therefore, the present invention provides a reception window period for periodically receiving reference transmission packets from the wireless temperature sensors 11-1 to 11-3.

The wireless temperature warning device 10 of the present embodiment is provided as a separate device so that it can be carried by the user. Alternatively, the wireless temperature warning device 10 may be integrally installed in a wireless portable terminal such as a smart phone. In this case, the wireless communication between the wireless temperature warning device 10 and the wireless temperature sensor can be performed using a Bluetooth module provided in the smartphone.

Once the reference transmission packet is received from the wireless temperature sensors 11-1 to 11-3, the wireless temperature warning device 10 is preferentially synchronized with the wireless temperature sensors 11-1 to 11-3 continuously Communication is performed, and at the time of going out again, the reference signal providing apparatus is preferentially received.

Each of the wireless temperature sensors 11-1 to 11-3 has a unique identification number, and the identification number is embedded in the internal memory so that the identification signal is distinguished from the signals from other wireless temperature sensors So that even if many devices are adjacent to each other, an error signal may not be generated.

The wireless temperature warning device 10 and each of the wireless temperature sensors 11-1 to 11-3 set a short time slot at a constant time interval to perform transmission and reception to minimize unnecessary transmission and reception power consumption.

3 is a block diagram showing a detailed configuration of a wireless temperature sensor according to a preferred embodiment of the present invention.

Referring to FIG. 3, the radio temperature warning device 10 and the wireless temperature sensors (for example, 11-1) are connected to each other by using an RF transceiver 33 in a one-to-one or one- ~ 11-3) and one-to-one wireless communication at all times, and transmits the measured temperature information.

At this time, the wireless temperature warning device 10 synchronizes with the reference transmission packet periodically provided by the wireless temperature sensors 11-1 to 11-3 to receive the reference transmission packet. In this case, both the wireless temperature warning device 10 and the wireless temperature sensors 11-1 to 11-3 communicate with each other only during a very short packet transmission and reception period, The power consumption can be eliminated. In order to enable such a technique, a packet arrival time prediction algorithm of the receiver of the wireless temperature warning device 20, which is periodically synchronized with the reference transmission packets of the wireless temperature sensors 11-1 to 11-3, is required.

To this end, the wireless temperature warning device 10 includes an RF transceiver 24 for receiving a reception packet including a reference packet for synchronizing with the wireless temperature sensor and the temperature information, (Not shown), initializes the previous timer time variation of the timer to the current timer time variation, initializes the previous timer time of the timer to the current timer time, instructs the RF transceiver 24 to receive the packets And a controller (20) for controlling the motor.

The controller measures the current timer time variation of the timer when the reception buffer of the RF transceiver 24 receives a predetermined number or more (here, three or more) of packets having the same SYNC word as the transmission buffer, And the timer is finely adjusted by comparing the change amount of the timer time with the change amount of the previous timer time.

The increment is set to a first threshold value (1) when the measured current time change amount is greater than the previous timer time change amount, and the increment is set to a second threshold value (-1) when the measured current time change amount is smaller than the first timer threshold change amount, Is set to the threshold value (0). The current timer time of the timer may be finely adjusted to a value obtained by subtracting (from the current timer time change amount - target time increment) and the set increment from the previous timer time change amount. Where the target time increment represents a basic delay time present in the loop.

When the packet having the same SYNC word is received less than the predetermined number (for example, less than 3), the current timer time of the timer is the current timer time initial value, the current timer time variation of the current timer is the current timer Is set to the initial value of the time variation amount.

4 is a flowchart illustrating an operation of a wireless temperature sensor according to an exemplary embodiment of the present invention.

As shown in FIG. 4, when the wireless temperature sensors 11-1 to 11-3 are initialized (S10), the wireless temperature sensors 11-1 to 11-3 perform temperature sensing and calibration (S11 , A packet is transmitted to the wireless temperature warning device 10 (S12), and the state returns to the pre-temperature sensor initialization state (S13) while waiting for a time T1 from the power cutoff state to the next packet transmission time.

FIG. 5 is a flowchart illustrating a method of estimating arrival time of a received packet in a wireless temperature warning device according to an exemplary embodiment of the present invention.

Referring to FIG. 5, at least one wireless temperature sensor measures temperature and periodically provides the temperature information wirelessly. In the wireless temperature warning device, communication with the at least one wireless temperature sensor is impossible The temperature alarm is outputted based on the provided temperature information.

The at least one wireless temperature sensor transmits a reference packet for synchronization with the wireless temperature warning device to the wireless temperature warning device. A timer corresponding to a reception window period for receiving the temperature information is set in the wireless temperature warning device. More specifically, a packet including the temperature information is periodically transmitted after a delay time of a threshold value for a time for preparing the receiving window. Initializes the previous timer time variation of the timer to the current timer time variation, initializes the previous timer time to the current timer time, and instructs reception of the packets. (S20, S21)

(S 23, S 24, S 25) when the reception buffer of the packets receives a predetermined number or more of packets having the same synchronization word as the transmission buffer (S 23, S 24, S 25) And the timer is finely adjusted by comparing the amount of change. (S26)

For this purpose, when the measured current time change amount is greater than the previous timer time change amount, the increment is set to a first threshold value (e.g., 1) (S27). When the current timer time change amount is smaller than a second threshold value -1) (S29). If they are the same, the increment is set to a third threshold value (e.g., 0) (S30).

The current timer time is a value obtained by subtracting the current timer time change amount from the previous timer time change amount by the set increment, and the target time increment represents a basic delay time. (S31, S32)

The current timer time is set as the current timer time initial value and the current timer time change amount of the current timer is set as the current timer time change amount initial value when the packet having the same synchronization word is received less than the predetermined number. (S34)

In more detail, the controller 20 instructs the RF transceiver 24 to receive a packet (S21), and monitors whether a packet having the same SYNC word as the transmitter is input to the reception buffer. If a packet having the same SYNC word as the transmitter is input to the reception buffer, the wireless sensor 11-1 and the SYNC for transmitting the SYNC word are detected. (S22) If the SYNC word is not detected, the SYNC word state is maintained. If it is detected that two or more SYNC words are received, the time until the detection of three or more SYNC words after the start of packet reception is measured using a timer. (S23, S24, S25)

The current timer time change amount is compared with the previous timer time change amount in step S26. If the current timer time change amount is large, the increment is increased by one (S27) To perform fine adjustment. This forms a feedback loop so that even if the transmitter's packet transmission period changes, it can be tracked.

In order to obtain the current timer time to set the timer, it is necessary to estimate the target time increment, which is the basic time delay inherent in the loop in this case, and to calculate the current timer time as " current timer time = previous timer time variation - (current timer time variation - target time increment) Use the formula. (S31, S32) Here, the target time increment can be set as an initial value. Here, the timer is set at the calculated current timer time and the timer is activated. (S33)

Finally, the previous timer time is set as the current timer time, and the previous timer time variation is set as the current timer time variation. (S34)

In the initial state, that is, when three or fewer SYNC words are received before using the prediction algorithm, the current timer time uses the initial value of the current timer time, and the current timer time variation uses the initial value of the current timer time variation. The two initial values are sufficient to operate the receiver of the wireless temperature warning device 10 long before the transmission packet arrives from the wireless temperature sensors 11-1 through 11-3 to the wireless temperature warning device 10 It should be set to a small value so that 100% packet reception is possible at the beginning of the wireless temperature warning device 10. The packet includes temperature information measured by each of the temperature sensors.

When the transmission packet arrival time prediction is performed at the receiving end, the receiver operates only during the time interval in which the transmission packet exists, and the remaining time can be the minimum power consumption state for all the transmitter receivers. This minimum power consumption state can be achieved by entering the RF transceivers 24 and 33 on the receiver side and the controllers 20 and 30 into the sleep mode at the appropriate time.

6 is a flowchart illustrating a low power mode algorithm of a wireless temperature warning device or wireless temperature sensor according to a preferred embodiment of the present invention.

Referring to FIG. 6, after the initialization (S40), the idle mode of the controllers 20 and 30 is released (S42) and the input / output pins of the controllers 20 and 30 are activated. (S43) Further, after changing the clocks of the controllers 20 and 30 to high frequencies, control is performed to change the RF transceivers 24 and 33 to the reception state (transmission state). (S45)

When the transceivers 24 and 33 are in the reception state (transmission state), they consume a lot of power, but reception is completed within a short time by the transmission packet arrival time predicting algorithm. (S48). When the reception is completed, the predicted future reception time (transmission time) is given to the timer, the RF transceiver 24, 33 is set to the sleep mode, the system clock of the controllers 20, After the input / output ports of the controllers 20 and 30 are deactivated and the timer is activated, the controllers 20 and 30 also enter the idle mode. When the predicted reception time (transmission time) is reached, the timer interrupts the controllers 20 and 30 to exit the idle mode and enter the reception state again.

7 is a timing chart of wireless packet transmission / reception between transceivers according to a preferred embodiment of the present invention.

Referring to FIG. 7, the wireless temperature warning device 10 is synchronized with a reference transmission packet periodically provided by the wireless temperature sensors 11-1 to 11-3 to allow packet reception. Next, the wireless temperature warning device 10 prepares a plurality of reception time slots that are separated by a constant interval time after the reference transmission packet, and waits for a reception window in each time slot. Each of the temperature sensors 11-1 to 11-3 transmits a packet to each designated time slot after reception of the reference transmission packet of the wireless temperature warning device 10 so that accurate communication can be performed. In this case, both the wireless temperature warning device 10 and the wireless temperature sensors 11-1 to 11-3 communicate with each other only during a very short packet transmission and reception period, while the other periods enter a sleep state, So much power consumption can be eliminated.

The embodiments of the present invention described above are not only implemented by the apparatus and method but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded, The embodiments can be easily implemented by those skilled in the art from the description of the embodiments described above.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings, and all or some of the embodiments may be selectively combined so that various modifications may be made.

20:
21: Switch
22: buzzer
23: LED
24: RF transceiver

Claims (17)

At least one wireless temperature sensor for measuring the temperature and periodically providing the temperature wirelessly;
And a wireless temperature warning device for outputting a temperature alarm based on the previously provided temperature when communication with the at least one wireless temperature sensor is disabled beyond a predetermined distance,
The wireless temperature warning device
An RF transceiver for receiving a receive packet including a reference packet and the temperature information for synchronization with the at least one wireless temperature sensor;
A timer for setting a time for receiving the reference packet and the received packet;
And a controller for initializing the previous timer time variation of the timer to the current timer time variation, initializing the previous timer time of the timer to the current timer time, and instructing the RF transceiver to receive the reference packet and the received packet, And,
Wherein the controller measures a change in the current timer time of the timer when the reception buffer of the RF transceiver receives a predetermined number or more of packets having the same synchronization word as the transmission buffer, To adjust the timer finely. ≪ RTI ID = 0.0 > 8. < / RTI >
The method according to claim 1,
Wherein the at least one wireless temperature sensor transmits a reference packet for synchronization with the wireless temperature warning device to the wireless temperature warning device.
3. The method of claim 2,
Wherein the wireless temperature warning device sets a timer for a reception window period for receiving a packet including the temperature information.
The method of claim 3,
And periodically transmits a packet including the temperature information after a delay time of a threshold value for a time for preparing the receiving window.
delete The method according to claim 1,
And sets the increment to a first threshold value when the measured current time change is greater than the previous timer time change amount and sets the increment to a second threshold when the measured current time change is smaller than the previous timer time change amount, Wireless fire alarm system.
The method according to claim 6,
Wherein the current timer time of the timer is a value obtained by subtracting (from the current timer time change amount - target time increment) and the set increment from the previous timer time change amount, wherein the target time increment represents a basic delay time Wireless fire alarm system.
8. The method of claim 7,
The current timer time of the timer is set to the current timer time initial value and the current timer time change amount of the current timer is set to the initial value of the current timer time variation amount when the packet having the same synchronization word is received less than the predetermined number Wireless fire alarm system.
The method according to claim 1,
Wherein the wireless temperature warning device is installed in a smart phone, and the RF transceiver uses a Bluetooth module embedded in the smart phone.
A wireless temperature warning method,
Measuring the temperature in at least one wireless temperature sensor and periodically providing the temperature information wirelessly;
And outputting a temperature alarm based on the provided temperature information when the wireless temperature warning device becomes unable to communicate with the at least one wireless temperature sensor beyond a predetermined distance,
A timer corresponding to a reception window period for receiving the temperature information is set in the wireless temperature warning device,
The wireless temperature warning method includes:
Initializing a previous timer time variation to a current timer time variation, initializing a previous timer time to a current timer time, and instructing reception of packets;
When the reception buffer of the packets receives a predetermined number or more of packets having the same synchronization word as the transmission buffer, measures the current timer time variation amount, compares the measured current time variation amount with the previous timer time variation amount, Further comprising the step of fine tuning.
11. The method of claim 10,
Further comprising transmitting from the at least one wireless temperature sensor a reference packet for synchronization with the wireless temperature warning device to the wireless temperature warning device.
delete 11. The method of claim 10,
And a periodically transmitting a packet including the temperature information after a delay time of a threshold value for a time for preparing the receiving window.
delete 11. The method of claim 10,
And sets the increment to a first threshold value when the measured current time change is greater than the previous timer time change amount and sets the increment to a second threshold when the measured current time change is smaller than the previous timer time change amount, Wireless temperature alarm method.
11. The method of claim 10,
Wherein the current timer time is a value obtained by subtracting (from the current timer time change amount - target time increment) and the set increment from the previous timer time change amount, wherein the target time increment indicates a basic delay time Alarm method.
11. The method of claim 10,
Wherein the current timer time is set to an initial value of the current timer time when a packet having the same synchronization word is received less than the predetermined number and the current timer time variation amount of the current timer is set to an initial value of the current timer time variation amount Wireless temperature alarm method.

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