KR20000018245A - Intelligent fire detect system using wireless communication - Google Patents

Abstract

PURPOSE: A fire alarm system using the wireless communication is provided to reduce the damage of fire by taking fast action against the fire by notifying people in real time by sending alarm through wireless communication by sensing the fire through a plurality of sensor. CONSTITUTION: The alarm system comprises a sensor(1), a control processor(2), a signal change modifying part(3), a frequency synthesizer/transfer part(4), a buffer amplifier(5), a switching switch(7), a BPF/LPF(8), an RF detector(9), a power control part(10), and an antenna(11). The sensor(1) senses different signals of temperature, thermal energy, smoke, opening and closing of the fire exit and transfers them into electric signal and sends the sensed electric signal to the control processor. The control processor further comprises one-chip micro processor and a code and operation program are stored inside the ROM memory of the processor.

Description

Intelligent fire detect system using wireless communication

The present invention relates to an intelligent fire detection system using wireless communication. In particular, a plurality of sensors detect temperature, heat, smoke, emergency door open / closed state, the presence or absence of infrared rays, theft, gas, and then wirelessly detect a fire detection signal after modulation. An intelligent fire detection system using wireless communication includes a fire signal detection system for transmitting and a fire signal processing system for receiving and demodulating a fire detection signal to provide a fire warning light and an alarm.

1A to 1B are diagrams of a conventional fire detection signal transmission system, and the contents of Patent 1998-053216 provide a unique ID for each detector belonging to one repeater 40 group to detect a fire occurrence in the sensor. A fire detection signal transmission method of wirelessly transmitting a unique ID code and a fire occurrence signal to the repeater wirelessly at 50 and determining whether the ID code stored in the relay and the received ID code match each other; Represents that system.

In the fire detection signal transmission method in which a fire detection signal generated by a sensor 20 installed with a sensor for detecting a fire is transmitted to the repeater 40 and the fire detection receiving unit 30 by a signal transmission line, the fire is detected by the sensor. Upon detection, the detector 50 generates a unique ID code signal assigned to each detector and transmits it to the repeater 40 wirelessly, and the ID code received from the repeater 40 is stored in the repeater 40. Determine if there is a match and output a fire alarm if it matches.

The fire detection system can prevent the detection of fire due to the disconnection of signal transmission line, and the alarm output can take action on fire occurrence and identify the exact fire location.

However, there is a disadvantage in that the receiver does not operate due to crosstalk when there are simultaneous transmission signals from several fire detectors, and multiple fire detection signals for the received signals cannot be processed by a program embedded in the receiver's microprocessor. There is a problem. In addition, the fire detection system installed by wire may not detect the fire occurrence by disconnection, and an intelligent fire detection system that provides comprehensive fire occurrence status information such as temperature detection, smoke detection, heat detection, etc. has not yet been proposed. There are disadvantages.

The present invention has been proposed to solve the above problems of the prior art, the object of the present invention is to detect the temperature, heat, smoke, emergency door open and closed state, the presence or absence of infrared rays, theft, gas in a plurality of sensors after modulation Wireless fire signal detection system that wirelessly transmits a fire detection signal, and receives and demodulates the fire detection signal to determine the exact location of the fire location by code analysis including the data of the sensor position in the microprocessor operating program. Provided is an intelligent fire detection system using wireless communication including a fire signal processing system that provides a fire warning light indication and a fire occurrence alarm.

1a to 1b is a schematic view of a conventional fire detection signal transmission system.

2 is a block diagram of a fire detection system and a fire signal processing system according to the present invention.

Explanation of symbols on the main parts of the drawings

1 sensor 2 controller processor

3: signal conversion / waveform shaping unit 4: frequency synthesizer / modulator

5: buffer amplifier 6: power amplifier

7: selector switch 8: bandpass filter

9: RF detector 10: Power control unit

11 transmitting antenna 20 receiving antenna

21: high frequency amplifier 22: double heterodyne receiver

23 limiter 24 frequency discriminator

25: signal polarity inversion circuit 26: low pass filter (LPF)

27: trigger circuit 28: code interpretation and processing microprocessor

29: fire occurrence alarm / fire location indicator

100: fire signal detection system 200: fire signal processing system

In order to achieve the above object, the present invention modulates fire detection information by detecting temperature, heat, smoke, emergency door open / closed state, presence or absence of infrared rays, theft, gas, and transmits a fire detection signal wirelessly. 100; And a fire signal processing system 200 configured to receive and demodulate the fire detection signal and then decode the code to notify the fire occurrence position and the fire occurrence alarm. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Intelligent fire detection system using a wireless communication according to the present invention is composed of a fire signal detection system 100 and a fire signal processing system 200.

Referring to FIG. 2, the fire signal detection system 100 includes a sensor 1, a controller processor 2, a signal conversion / waveform shaper 3, a frequency synthesizer / modulator 4, and a buffer. Buffer Amplifier (5), Power Amplifier (6), Switching Switch (7), Bandpass Filter / Lowpass Filter (BPF / LPF) (8), RF Detector (9), Power Control Unit ( 10) and the transmit antenna 11.

The sensor 1 detects a signal for temperature sensing, heat sensing, smoke sensing, opening / closing state detection of an emergency door, presence or absence of infrared rays, presence of an object, etc. in several sensors and converts the detected electrical signal into an electrical signal. It is sent to the controller processor 2.

The sensor 1 is a fire detection sensor, generally composed of a smoke sensor and a constant temperature sensor. The smoke sensor acts as an electronic switching by causing the smoke particles to ionize in the sensor, thereby causing a change in the capacity of the capacitor. The temperature sensor uses a switching role due to thermal expansion due to temperature. Therefore, since the switch is open in the normal state to cut off the power supply of the transmitter, the use of a power source, which is one of the problems of the wireless fire detector, can be minimized in these methods.

The controller processor 2 is composed of a one-chip microprocessor, and a code and an operating program for each fire detector are embedded in the ROM memory of the processor. The code consists of a start bit, a recognition byte, a unique code byte, and a termination bit. When the program is requested to start the program from the sensor 1, the operating program determines whether there is a signal from the RF detector 9 (if there is a carrier wave in the use band around the antenna, if there is a carrier band, the signal is not sent). If no signal is present, the built-in code is output several times at a fixed speed and waited for a fixed time. If there is no signal after a predetermined time, the code is output again. This allows time consideration to share and transmit fire signals from multiple fire detectors.

The signal conversion / waveform shaping section 3 is composed of a signal polarity inversion circuit and a waveform shaping circuit. The signal conversion / waveform shaping section 3 comprises a mark frequency when the digital signal is 0 and a space frequency when the digital signal is 0 to a low side or a high side. Select whether or not to face the wave, and make the amplitude of the signal wave constant to keep the shift frequency at the specified value and limit the occupied frequency band.

The frequency synthesizer / modulator 4 connects a voltage controlled oscillator (VCO) in a circuit to a frequency generator and locks it to generate a very stable oscillation frequency, and then codes in a F1D, F2D, and A1D manner. Modulate

In the buffer amplifier 5, when the output circuit of the oscillation circuit is directly amplified, the oscillation frequency may change because the parallel impedance changes. Therefore, it serves to separate the load and the oscillator so as not to be affected.

The power amplifier 6 serves to supply power to the antenna so that the signal goes to the receiver.

The switching switch 7 is connected to an RF detector 9 which is a carrier frequency detection circuit in a normal state, and connected to a power amplifier 6 when a transmission is necessary in case of a fire, and after a certain time, the RF detector 9 Repeat the operation connected to.

The band pass filter (BPF) / low pass filter (LPF) 8 suppresses noise generated by band filtering and low pass filtering.

The RF detector 9 detects the presence or absence of a carrier frequency in use and sends a signal to the controller processor 2 if it exists, and does not send a signal if it does not exist.

The power supply control unit 10 uses power only in the circuit of the RF detector 9 during normal operation, and minimizes the use power by controlling power supply to all circuits in case of abnormality.

The transmitting antenna 11 carries the fire detection signal modulated to an analog signal and transmits it wirelessly.

Referring to FIG. 3, the fire signal processing system 200 includes a reception antenna 20, a high frequency amplifier 21, a double heterodyne receiver 22, a limiter 23, a frequency discriminator 24, and a signal polarity inversion. Circuit 25, low pass filter (LPF) 26, trigger circuit 27, code interpretation and processing microprocessor 28, and fire alarm / fire location indicator 29.

The high frequency amplifier 21 is composed of an input circuit and a high frequency amplifier, and because the strength of the signal received from the receiving antenna 20 is weak, the received signal is sufficiently large to demodulate the original signal. Amplification is provided to the double heterodyne receiver 22.

The double heterodyne receiver 22 includes a frequency mixer, a local oscillator, and a bandpass filter, and has a double heterodyne reception method for converting a reception frequency into an intermediate frequency to facilitate amplification and selection of a received signal. Demodulate

The limiter 23 cuts a predetermined level or more of the received signal to the double heterodyne receiver 22 so as to have a constant amplitude so as not to affect the original signal even if noise in the received radio wave is added to the signal. do.

The frequency discriminator 24 converts the change in frequency from the limiter 23 into a change in amplitude to reproduce the original signal.

The signal polarity inverting circuit 25 decodes the mark in the same manner as the frequency in which the mark and the space state of the original signal are defined by the transmitter.

The low pass filter (LPF) 26 provides the output signal of the signal polarity inversion circuit 25 as a low pass filtered signal.

The trigger circuit 27 receives the low pass filtered signal as a digital code originally sent and provides it to the code interpretation and processing microprocessor 28.

The code interpretation and processing microprocessor 28 is composed of a one-chip microprocessor and an operating program is embedded in a ROM memory. The operating program is ready to read the received digital code by the signal input from the trigger circuit 27. Then, the digital code of the start bit to be input is read, followed by the recognition byte. These digital values determine whether the fire detection system and the fire treatment system are on the same system. If the value of the recognition byte is wrong compared to the pre-built values, it is regarded as a signal transmitted by the fire detection system of another system and further decoding of the code is stopped. And if it matches, it reads the unique code digital value which shows the position of the sending apparatus, and completes receiving one information signal with a termination bit.

In addition, the operating program embedded in the code interpretation and processing microprocessor 28 recognizes a fire condition and then commands various actions as a next step. For example, telephony for building supervisors, emergency door opening, warning lights, beeps, fire reports.

The fire alarm / fire position indicator 29 has an emergency power source, and can determine the exact fire position by a fire action command received from the microprocessor 28 which is the code analysis and processing processor, and makes a phone call or emergency. It alerts you to open doors, turn on warning lights, and make beeps.

As described above, the intelligent fire detection system using wireless communication according to the present invention detects a fire in a fire signal detection system by detecting a state such as temperature, heat, smoke, emergency door opening and closing state through a plurality of sensors, and performs wireless communication. Through the transmission to the fire signal processing system, the fire warning light indication and warning sound can be recognized by the administrator in real time so that the location of the fire can be identified in detail, and by taking measures such as making a phone call (fire report) and opening an emergency door. It has the effect of reducing the risk of human and property damage by taking quick measures against fire.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated.

Claims (3)

A fire signal detection system 100 for detecting a temperature, heat, smoke, emergency door open / closed state, infrared ray presence, theft, gas, and modulating fire detection information to wirelessly transmit a fire detection signal; And Intelligent fire detection system using wireless communication, characterized in that consisting of a fire signal processing system for receiving the fire detection signal and demodulate and then decode the code to notify the fire location and the fire occurrence alarm. The method of claim 1, The fire signal detection system 100 A sensor (1), which is a plurality of fire detectors for detecting a signal such as temperature, heat, smoke, emergency door open / closed state, presence or absence of infrared rays, presence of an object and converting the signal into an electrical signal; In the ROM memory of the microprocessor, a code indicating each fire detector (consisting of a start bit, a recognition byte, a unique code byte, and a termination bit) and an operating program are embedded, and when the start of the program is requested from the sensor 1, the operation is performed. A controller processor (2) for waiting for the transmission of the code if there is an RF detection signal by the program, and for transmitting and sharing the fire signal detected by several fire detectors because the code cannot be transmitted without the signal; Comprising a signal polarity inverting circuit and a waveform shaping circuit, select whether to set the mark frequency when the digital signal is 0 and the space frequency when the digital signal is 1 to the lower or higher, and the detected fire A signal conversion / waveform shaping part (3) for providing a waveform-shaped fire detection signal by limiting the occupied frequency band by keeping the amplitude constant by the waveform shaping circuit to maintain a shift frequency at a predetermined value; Frequency synthesizer / modulator for modulating the code in F1D, F2D, A1D method after generating the very stable oscillation frequency by locking the voltage-controlled oscillator (VCO) to the frequency generator by receiving the waveform-formed fire detection signal. 4); A buffer amplifier (5) for separating the load and the oscillator so that the oscillation frequency is not affected because the parallel impedance changes when the modulator signal is input from the frequency synthesizer / modulator 4 and directly amplifies the output circuit of the oscillator circuit; A power amplifier (6) for amplifying the power of the output signal from the buffer amplifier (5) to supply power to the antenna to provide a fire detection signal to the receiver; A switching switch 7 connected to a carrier frequency detection circuit (RF detector) in a normal state, and connected to the power amplifier as a transmission circuit at the time of fire detection; A band pass filter / low pass filter (BPF / LPF) 8 for suppressing noise generated by performing constant band filtering and low pass filtering of the frequency band of the fire detection signal; An RF detector (9) which is a carrier frequency detection circuit which senses the presence or absence of a carrier frequency in use and sends a signal to the controller processor (2) if it exists and does not send a signal if it does not exist; A power control unit 10 for controlling power so that only the circuit of the RF detector 9 uses power in normal operation and power is supplied to all circuits in a fire detection; And Intelligent fire detection system using a wireless communication, characterized in that it comprises a transmission antenna (11) for transmitting the fire detection signal modulated to an analog signal for wireless transmission. The method of claim 1, The fire signal processing system 200 A reception antenna 20 for receiving the fire detection signal transmitted wirelessly; A high frequency amplifier 21 connected to the receiving antenna 20 for sufficiently amplifying the received signal to demodulate the original signal; A double heterodyne receiver 22 comprising a frequency mixer, a local oscillator and a bandpass filter, for demodulating with a double heterodyne reception scheme that converts a reception frequency into an intermediate frequency for easy amplification and selection of a received fire detection signal. ; A limiter (23) for blocking a predetermined level or more of the received signal from the double heterodyne receiver (22) so as to have a constant amplitude so as not to affect the original signal even if noise in the received radio wave is added to the signal; A frequency discriminator (24) for converting a change in frequency from the limiter (23) into a change in amplitude to reproduce the original signal; A signal polarity inverting circuit (25) for receiving a signal from the frequency discriminator (24) and deciphering the signal in the same manner as the frequency defining the display (0,1) space state of the original signal at the transmitter; A low pass filter (LPF) 26 for providing the output signal of the signal polarity inversion circuit 25 as a low pass filtered signal; A trigger circuit (27) for receiving the low pass filtered signal with the originally sent digital code; Read the digital code received by the operating program embedded in the ROM memory, read the start bit, the digital code, and the recognition byte, and if the recognition byte value is wrong compared to the built-in value, it is transmitted from another fire detection system. A code interpretation and processing microprocessor 28 for recognizing a fire condition after reading a unique code digital value indicating the position of the transmitting device, if it is considered a signal, and stopping further code decoding, if any; And It is characterized in that it consists of a fire occurrence alarm unit / fire position indicating unit 29 for notifying the fire occurrence command to the administrator to receive the fire action command from the code interpretation and processing microprocessor 28 to notify the fire occurrence. Intelligent fire detection system using wireless communication.