KR20190124557A - An address type fire detection device using a voltage controlled current source controlled and a fire detection system including the same - Google Patents

Abstract

Provided is an address type fire detection apparatus using a voltage controlled current source which comprises: an address setting unit generating an address code value corresponding to an electrical connection state of each of a plurality of switches; a microprocessor generating a reference voltage having a voltage level corresponding to the address code value; and a voltage controlled current source circuit unit driving a fire detection constant current having a current value corresponding to a voltage level of the reference voltage to a power line when a fire detection sensor is activated.

Description

An address type fire detection device using a voltage controlled current source controlled and a fire detection system including the same}

The present invention relates to a fire detection device, and more particularly, to a fire detection system including the address type fire detection device using a voltage controlled current source.

The fire detectors include heat detectors and temperature detectors. The addressable automatic fire detection systems developed so far include the use of resistance addressable fire detectors and the use of microcomputer addressable fire detectors. have.

(1) Outline of address type fire detector and fire detection system using existing resistance

1 is a block diagram of a conventional resistance-type address fire detection system, Figure 2 is a block diagram of a conventional fire detection unit.

1 and 2, the existing 'resistance address type fire detection system' is composed of a receiver and a plurality of fire detection unit. The receiver consists of a current-sense resistor, a microcomputer with an analog-to-digital converter (ADC), and a display module.

As shown in FIG. 2, each fire detection unit includes an address setting unit and a fire detection unit, and the address setting unit includes five address setting switches and five resistors from R1 to R5 connected to each switch. .

The operation principle of the conventional resistance-type address fire detection system is as follows.

When the fire detector operates, a current corresponding to the position of the address setting switch flows through the + 24V power supply line. When the voltage applied to the 'current detecting resistor' of the receiver is read from the central processing unit (CPU) through the analog-to-digital converter (ADC), the address value of the address setting switch can be known. have.

라 하고, 주소설정부의 등가 저항값을 R이라 하면, 화재감지기가 동작하였을 때 전류 검출 저항

에 흐르는 전류는

이다. 주소설정용 스위치 5개의 조작으로 R값을 변화시켜

를 정수 배로 하기가 어렵다. 따라서 이 방식은 시공시 어려움이 있다.Advantages and disadvantages of the conventional resistance-type address fire detection system are as follows. The advantage is that construction cost is low because only + 24V power line is used instead of communication line. The disadvantage is that it is difficult to adjust the current flowing to the detector proportionally by the operation of the address setting switch. Value of current sense resistor

If the equivalent resistance value of the address setting unit is R, the current detection resistance when the fire detector is

Current flowing in the

to be. Change the R value by operating five switch for address setting

It is difficult to multiply by. Therefore, this method has difficulty in construction.

(2) Overview of address type fire detector and fire detection system using existing microcomputer

3 is a block diagram of an address type fire detection system using a conventional microcomputer.

Referring to FIG. 3, the conventional "address type fire detection system using a microcomputer" includes a receiver and a plurality of fire detection units. The receiver consists of an input module, a microcomputer, and a display module. The fire detector consists of a fire detector, a microcomputer, and an address setter.

The operation principle of the conventional 'address type fire detection system using a microcomputer' is as follows. When the fire detector operates, the microcomputer of the fire detector sends the address of the fire detector operated through the communication line to the microcomputer of the receiver, so that the address of the fire detector operated can be known.

Advantages and disadvantages of the conventional address type fire detection system using a microcomputer are as follows. The advantage is that an addressable automated detection system can be realized. Disadvantages are that the communication line is used in addition to the + 24V power line, which requires a lot of construction costs, and the replacement of the fire detection system already installed requires a communication line, as well as the replacement of the fire detector and receiver, which is expensive.

The present invention has been proposed to solve the above technical problem, by using a voltage-controlled current source controlled by a microprocessor, the address type fire detection device that can operate using only the power line without additional communication line And it provides a fire detection system comprising the same.

According to an embodiment of the present invention for solving the above problems, an address setting unit for generating an address code value corresponding to the electrical connection state of each of the plurality of switches, and a reference having a voltage level corresponding to the address code value A microprocessor for generating a voltage and a voltage control current source circuit for driving a fire detection constant current to a power line having a current value corresponding to the voltage level of the reference voltage according to the control of the reference voltage when the fire detection sensor is activated. An address type fire detection device using a voltage controlled current source is provided.

In addition, the address type fire detection apparatus of the present invention further includes a switching circuit for selectively supplying a driving power to the voltage control current source circuit portion under the control of a switching control signal, the switching control signal is generated by the microprocessor It is characterized in that it is selectively activated according to whether the fire detection sensor is active.

In addition, the voltage control current source circuit unit included in the present invention includes at least one NPN transistor under the control of the reference voltage, and is a current sink (Current sink) circuit for driving the fire detection constant current to the power line Characterized in that configured.

In addition, the voltage control current source circuit unit included in the present invention includes at least one PNP transistor under the control of the reference voltage, the discharge current (current source) circuit for driving the fire detection constant current to the power line It is characterized in that the configuration.

In addition, according to another embodiment of the present invention, since different address code values are set according to the place where they are arranged and connected to each other in parallel to the power line, their address code values when the fire detection sensor assigned to them is activated A plurality of address type fire detection devices each driving a fire detection constant current having a current value corresponding to the power line, and at least one address type of the plurality of address type fire detection devices based on a current value flowing through the power line After determining whether the fire detection device is operated, a fire detection system including a fire receiver for indicating a place where a fire has occurred is provided.

In addition, the plurality of address type fire detection apparatus included in the present invention, the address setting unit for generating an address code value corresponding to the electrical connection state of each of the plurality of switches, and the voltage level corresponding to the address code value A microprocessor for generating a reference voltage having a reference voltage and a voltage control for driving a fire detection constant current having a current value corresponding to the voltage level of the reference voltage to a power line when the fire detection sensor is activated. And a current source circuit portion.

In addition, the address type fire detection device included in the present invention further includes a switching circuit for selectively supplying a driving power to the voltage control current source circuit portion in accordance with the control of the switching control signal, the switching control signal is the microprocessor Generated from, but selectively activated according to whether the fire sensor is active.

In addition, the voltage control current source circuit unit included in the present invention includes at least one NPN transistor under the control of the reference voltage, and is a current sink (Current sink) circuit for driving the fire detection constant current to the power line It is characterized in that the configuration.

In addition, the voltage control current source circuit unit included in the present invention includes at least one PNP transistor under the control of the reference voltage, and discharge current (current source) circuit for driving the fire detection constant current to the power line Characterized in that configured.

An address type fire detection device and a fire detection system using a voltage controlled current source according to an embodiment of the present invention, by using a voltage controlled current source controlled by a microprocessor, can operate using only a power line without additional communication lines. Can be.

Also, by driving the fire detection constant current using the reference voltage VREF having a voltage level corresponding to the address code value, the fire detection constant current driven by each address type fire detection device can be easily set to be proportional to the address code value. have.

In a normal state in which no fire has occurred, the value of I _i -normal is reduced by arranging the switching circuit 151 that cuts off the power supply of the voltage controlled current source circuit unit 130 in front of the voltage controlled current source circuit unit 130.

In addition, the switching circuit 151 performs the function of the transistor Tr in order to remove the influence of the transistor collector voltage V _f caused by the transistor Tr not being completely turned on or turned off. Incidentally, by reducing one operational amplifier, I _-normal value can be reduced.

1 is a block diagram of a conventional resistance-type address fire detection system
2 is a block diagram of a conventional fire detection unit
3 is an address type fire detection system using a conventional microcomputer
4 is a block diagram of a fire detection system 2 according to an embodiment of the present invention
5 is a configuration diagram of an address type fire detection apparatus 300-1 using a voltage controlled current source included in the fire detection system 2.
6 is a configuration diagram according to another embodiment of the digital-to-analog converter;
7 is a configuration diagram according to another embodiment of a digital-to-analog converter;
8 is a configuration diagram according to another embodiment of the voltage control current source circuit portion;
9 is a configuration diagram of a fire detection system 3 according to another embodiment of the present invention.
10 is a configuration diagram of an address type fire detection apparatus 100-1 using a voltage controlled current source included in a fire detection system 3.
11 is another configuration diagram of the address type fire detection apparatus 100-1 using the voltage controlled current source included in the fire detection system 3.
12 is a configuration diagram according to another embodiment of the voltage control current source circuit portion;

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention.

4 is a block diagram of a fire detection system 2 according to an embodiment of the present invention.

The fire detection system 2 according to the present embodiment includes only a brief configuration for clearly explaining the technical idea to be proposed.

Referring to FIG. 4, the fire detection system 2 includes a plurality of address type fire detection devices 300 and a fire receiver 400.

Looking at the detailed configuration and main operation of the fire detection system (2) configured as described above are as follows.

The plurality of address type fire detection apparatuses 300 are disposed at different places, respectively, and are configured to detect whether a fire is disposed at the place.

In addition, since the plurality of address type fire detection apparatus 300 is set to different address code values according to the arrangement place, it is possible to identify the location of each address type fire detection apparatus through the setting of the address code value.

The plurality of address type fire detection apparatuses 300 are configured to have different address code values according to the place where they are arranged, and to be connected to the power lines in parallel. The plurality of address type fire detection devices 300 respectively drive a fire detection constant current having a current value corresponding to its address code value when the fire detection sensor assigned thereto is activated.

For example, referring to the first address type fire detection device 300-1 among the plurality of address type fire detection devices 300,

When the fire detection sensor of the first address type fire detection device 300-1 becomes active-fire detection state, the first address type fire detection device 300-1 receives a current value corresponding to its own address code value. The first fire detection constant current I1 is driven.

In addition, when the fire detection sensor of the second address type fire detection device 300-2 is active-the fire detection state-, the second address type fire detection device 300-2 is a current corresponding to the value of its own address code. A second fire detection constant current I2 having a value is driven.

At this time, the current value of the first fire detection constant current I1 and the current value of the second fire detection constant current I2 are determined by the address code value set in its own address setting section.

The fire receiver 400 determines whether at least one address type fire detection device of the plurality of address type fire detection devices 300 is operated-whether or not the fire is detected-based on the current value flowing through the power line, and then determines a place where a fire has occurred. It is configured to be displayed.

이라고 하면, 모든 장소에서 화재가 발생하지 않은 상태에서의 전원라인에는 기본전류 I_normal =

의 전류가 흐른다.For example, when all of the fire detection sensors of the plurality of address type fire detection devices 300 are not in an active state, it is defined as a state where no fire occurs in all places. At this time, since all the plurality of address type fire detection devices 300 do not drive the fire detection constant current, the basic current I _terminal by the _terminal resistor R _terminal flows through the power supply line. That is, the current flowing through the N fire detectors basically

In this case, if the power line does not occur in all places, the basic current I _normal =

Current flows.

At this time, the fire detection sensor of the first address type fire detection device 300-1 is active-fire detection state-the current value corresponding to the address code value of the first address type fire detection device 300-1 When driving the first fire detection constant current (I1) having a

Since the first address type fire detection device 300-1 is connected in parallel with the power line, the total current value I flowing through the power line is determined by the basic current I _normal and the first fire detection constant current I1. It is defined as the sum.

Therefore, the fire receiver 400 detects the total current value I flowing through the power line to determine that the first address type fire detection device 300-1 is active-a fire detection state, and the first address type fire detection device. The display module indicates that a fire has occurred in an area where the 300-1 is located.

In addition, the fire detection sensor of the first address type fire detection device (300-1) is active-fire detection state-the current value corresponding to the address code value of the first address type fire detection device (300-1) Drive the first fire detection constant current (I1) having:

The fire detection sensor of the second address type fire detection device 300-2 becomes active-the fire detection state-so that the second address type fire detection device 300-2 has a current value corresponding to its own address code value. When driving the second fire detection constant current (I2),

Since the first address type fire detection device 300-1 and the second address type fire detection device 300-2 are connected in parallel with the power supply line, the total current value I flowing through the power supply line is determined by the basic current ( I _normal ), the first fire detection constant current I1 and the second fire detection constant current I2 are defined as the sum.

Therefore, the fire receiver 400 detects the total current value I flowing through the power line and determines that the first and second address type fire detection devices 300-1 and 300-2 are both active and fire-detected. The display module indicates that a fire has occurred in the areas where the first and second address type fire detection devices 300-1 and 300-2 are located.

The configuration and operation of the fire detection system 2 shown in FIG. 4 will be described in more detail as follows.

The fire receiver 400 includes a current detector, an MCU having an analog to digital converter (ADC), and a display module.

In addition, it consists of a plurality of address type fire detection device 300 and the terminal resistor (R _terminal ), each 'address type fire detection device' is an address setting unit, D / A conversion unit, fire detection sensor, and voltage control It consists of a current source circuit section.

  The address setting part of 'address type fire detection device' sets the address in binary form, the D / A converter converts the address set in binary form into analog voltage and outputs it. The voltage control current source circuit part fires. When the sensing sensor operates, it plays a role of flowing the current controlled by the output voltage of the D / A change part to the + 24V power line.

를 저항

를 통하여 검출하고 증폭기로 증폭한다. '마이컴(MCU)'은 증폭기의 출력전압을 ADC(Analog to Digital Coverter)를 통하여 받아들여 정상상태 여부와 동작한 주소형 화재감지장치의 주소(즉, 화재발생 위치)를 알아내고 결과를 '디스플레이 모듈'로 보낸다. 디스플레이 모듈은 마이컴으로부터 받은 정보, 즉 정상상태 여부와 화재발생 위치를 표시해 주는 장치이다.Current detector in the fire receiver 400 is a current flowing through the + 24V power line

Resistance

Detects through and amplifies with amplifier. 'MCU' receives the output voltage of the amplifier through Analog to Digital Coverter (ADC) to find out whether it is in a normal state and the address (ie fire location) of the address type fire detection device that operated and displays the result Module '. The display module is a device that displays the information received from the microcomputer, that is, whether it is in a normal state and the location of the fire.

의 전류가 흐르고, 화재가 발생하여 화재감지기부에 있는

번주소의'주소형 화재감지장치'가 동작하면 +24V 전원선에

의 전류가 흐른다.

의 크기는'주소형 화재감지장치'의 주소 설정부에서 설정한 주소값

에 따라 크기가 결정된다. If the fire detector does not operate due to no fire, the + 24V power line

Current flows and a fire breaks out

When the 'Address type fire detector' of address no.

Current flows.

Size is the address value set in the address setting section of 'Address type fire detection device'.

The size is determined according to.

For example, when the address type fire detection device of address 1 operates, current of α㎃ (α is an integer) corresponding to address 1 flows, and the address address fire detection device of address 2 operates. Then, a current of β㎃ (β is an integer) corresponding to address 2 flows.

를 저항

에 걸리는 전압

로 검출하고 증폭기로 K배 증폭한다. 마이컴(MCU)은 ADC를 통하여 증폭된

의 전압을 디지털 신호로 변환하고, CPU는 변환된 결과를 입력받아 프로그램 처리하여 정상상태 여부와 동작한 주소형 화재감지장치의 주소(즉, 화재발생 위치)를 알아낸다. 디스플레이 모듈은 정상상태 여부와 화재발생 위치를 나타내 준다.The current detector of the fire receiver 400 current flowing through the + 24V power line

Resistance

Voltage

And amplify K times with an amplifier. Microcomputer (MCU) is amplified by ADC

Is converted into a digital signal, and the CPU receives the converted result and processes the program to find out whether it is in a normal state and the address of the address type fire detection device (that is, the fire location). The display module shows the status of normal status and the location of fire.

의 전류가 흐르므로 CPU에서 받아들인 전압값은

이다. i번 주소에서 화재가 발생하여 i번 주소의 '주소형 화재감지장치'가 동작하면, +24V 전원선에

의 전류가 흐르므로 CPU에서 받아들인 전압값은

이다. When in a normal state without a fire, the + 24V power supply

Since the current flows through, the voltage value accepted by the CPU

to be. If a fire occurs at address i and 'address type fire detector' at address i operates,

Since the current flows through, the voltage value accepted by the CPU

to be.

에서

으로

만큼 증가하면 i번 주소의 '주소형 화재감지장치'가 동작한 것으로 판단할 수 있다.Therefore, the voltage value received from the CPU

in

to

Increasing by, it can be determined that the 'address type fire detection device' of the address i has operated.

     The advantages of the proposed address-type fire detection device using a voltage-controlled current source controlled by a digital analog converter and a fire detection system including the same are as follows.

의 전류가 더 흐르게 함으로써 동작한 주소형 화재감지장치의 주소 i를 알아내는 방법이므로 기존의 통신선과 +24V 전원선 모두를 사용하는 방법보다 설치비가 적게 든다.The detection method of fire occurrence address is that the + 24V power line

It is a method to find out the address i of the address type fire detection device operated by letting more current flow, so the installation cost is lower than the method using both the communication line and the + 24V power line.

5 is a configuration diagram of an address type fire detection apparatus 300-1 using a voltage controlled current source included in the fire detection system 2.

The address type fire detection apparatus 300-1 according to the present embodiment includes only a brief configuration for clearly describing the technical idea to be proposed.

Referring to FIG. 5, the address type fire detection apparatus 300-1 includes an address setting unit 310, a digital analog converter 320, and a voltage controlled current source circuit unit 330.

Looking at the detailed configuration and the main operation of the address-type fire detection device 300-1 configured as described above are as follows.

The address setting unit 310 generates an address code value corresponding to the electrical connection state of each of the plurality of switches. Since eight switches are provided in this embodiment, the (digital) address code values can be set by a combination of turn on and turn off of each switch.

The digital analog converter 320 generates a reference voltage VREF having a voltage level corresponding to the address code value.

In this embodiment, the digital-to-analog converter 320 includes a digital-to-analog converter 321 and an adder 322.

The digital-to-analog converter 321 receives an address code value and generates an output voltage VO having a voltage level corresponding to the address code value. That is, the voltage level of the output voltage VO output from the digital-to-analog converter 321 is determined by the address code value which is a digital code value.

The adder 322 has two inputs, the output voltage V0 determined by the address code value and the switching element voltage VSCR fed back, and outputs the reference voltage VREF as an output signal.

On the other hand, the voltage control current source circuit unit 330 is a fire detection constant current (I1) having a current value corresponding to the voltage level of the reference voltage (VREF) under the control of the reference voltage (VREF) when the fire detection sensor 340 is active. ) As a line connected in parallel with the power line.

The voltage controlled current source circuit unit 330 includes at least one NPN transistor under the control of the reference voltage VREF, and a current sink driving the fire detection constant current I1 as a line connected in parallel with the power line. It can be composed of a circuit.

That is, the voltage controlled current source circuit unit 330 includes a comparator 331, a current driver 332, and a switching element SCR.

At this time, the comparator 331 compares the feedback voltage by the fire detection constant current I1 and the resistor R with the reference voltage VREF, and configures the current driver 332 to output the voltage output by the comparison result. Transfer to the gate of NPN transistor.

When the switching element SCR is turned on, the current driver 332 drives the fire detection constant current I1 corresponding to the voltage level of the reference voltage VREF. In the present embodiment, the switching element SCR Is composed of Silicon Controlled Rectifier (SCR).

SCR (Silicon Controlled Rectifier) is selectively turned on (TURN ON) according to the control of the fire detection signal transmitted from the fire detection sensor 340. Therefore, when SCR (Silicon Controlled Rectifier) is turned on (turn ON)-when a fire is detected-the current driver 332 drives the fire detection constant current (I1) to the line.

That is, the operation principle of the address type fire detection apparatus 300-1 is as follows. The address set by the address setting unit 310 may be treated as the address of the fire detection sensor and may also be treated as the address of the 'address type fire detection device 300-1'.

In FIG. 5, the voltage level of the output voltage VO output from the digital-to-analog converter 321 is in the range of 0V to 5V, and the resolution is set to 8 bits.

[V]이다.When the address setting switch in the address setting unit 310 is set to N ₂ as a binary number and i as a decimal number, the input value of the digital analog converter 321 is i (that is, N ₂ ) and the digital analog converter 321 Output voltage V _o is

[V].

이며, R1 = R2, R3 = R4 이면, V_ref = V_O + V_SCR 이다.Output voltage V _ref = of adder 322

If R1 = R2, R3 = R4, V _ref = V _O + V _SCR .

이다.When the fire detection sensor 340 at address i operates, the SCR is turned on and the current flowing through the output terminal transistor of the voltage control current source circuit unit 330.

to be.

That is, when the address type fire detection device 300-i at address i operates, a current of I _i flows further on the + 24V power line, and _i i corresponds to _i one-to-one. . Further, the current I _i flowing through the output terminal transistor of the voltage controlled current source circuit unit 330 is proportional to the set address value (address value of the address setting unit) i of the fire detection sensor.

  In the address type fire detection device 300-1 of FIG. 5, the voltage controlled current source circuit unit 330 is configured as a suction type current sink using an npn type transistor, but as illustrated in FIG. 8, a pnp type transistor. It can also be implemented as a discharge type current source (using).

6 is a block diagram of another embodiment of the digital-to-analog converter 320A.

Referring to FIG. 6, the digital analog converter 320A includes a microcontroller 121A and an adder 322A.

The digital-analog converter 320A receives an address code value in parallel and generates a reference voltage VREF having a voltage level corresponding to the address code value.

In the present embodiment, the microcontroller 321A receives an address code value through a parallel port and generates an output voltage VO having a voltage level corresponding to the address code value. That is, the voltage level of the output voltage VO output from the microcontroller 321A is determined by the address code value, which is a digital code value.

The adder 322A has two inputs, the output voltage V0 determined by the address code value and the switching element voltage VSCR fed back, and outputs the reference voltage VREF as an output signal. (V _ref = V _O + V _SCR )

7 is a configuration diagram according to another embodiment of the digital-to-analog converter 320B.

Referring to FIG. 7, the digital-to-analog converter 320B includes a microcontroller 321B, a low pass filter 322B, and an adder 323B.

The digital-to-analog converter 320B receives the address code value in parallel and generates a reference voltage VREF having a voltage level corresponding to the address code value. The microcontroller 321B receives the address code value through the parallel port. Generates PWM output voltage (Pulse Width Modulation, PWM) with pulse width corresponding to address code value. That is, since the pulse width of the PWM output voltage PWM is determined according to the address code value, the voltage level of the reference voltage VREF is also determined by the pulse width of the PWM output voltage PWM, and as a result, the reference voltage VREF. It can be seen that the voltage level of is determined corresponding to the address code value.

The low pass filter 322B receives the PWM output voltage PWM and removes the ripple signal and outputs the ripple signal as the output voltage VO.

That is, the pulse width of the PWM output voltage PWM output from the microcontroller 321B is determined by the address code value, which is a digital code value, and the low pass filter 322B removes the ripple of the PWM output voltage PWM. After that, it outputs as output voltage (VO).

At this time, the adder 323B has two inputs, the output voltage V0 determined by the address code value and the switching element voltage VSCR fed back, and outputs the reference voltage VREF as an output signal. (V _ref = V _O + V _SCR )

8 is a configuration diagram according to another embodiment of the voltage controlled current source circuit unit 330A.

Referring to FIG. 8, when the fire detection sensor 340 is activated, the voltage controlled current source circuit unit 330A has a fire having a current value corresponding to the voltage level of the reference voltage VREF under the control of the reference voltage VREF. The sense constant current I1 is driven by a line connected in parallel with the power line.

The voltage control current source circuit unit 330A includes at least one PNP transistor under the control of the reference voltage VREF, and discharge current (Current source) driving the fire detection constant current I1 to a line connected in parallel with the power line. It can be composed of a circuit.

That is, the voltage controlled current source circuit unit 330A includes a comparator 331A, a current driver 332A, and a switching element SCR.

At this time, the comparison unit 331A compares the feedback voltage by the fire detection constant current I1 and the resistor R with the reference voltage VREF, and configures the current driver 332A to output the voltage output by the comparison result. Transfer to the gate of the PNP transistor.

The current driver 332A drives the fire detection constant current I1 corresponding to the voltage level of the reference voltage VREF when the switching element SCR is turned on. In this embodiment, the switching element SCR Is composed of Silicon Controlled Rectifier (SCR).

SCR (Silicon Controlled Rectifier) is selectively turned on (TURN ON) according to the control of the fire detection signal transmitted from the fire detection sensor 340. Therefore, when SCR (Silicon Controlled Rectifier) is turned on-when a fire is detected-the current driver 332A drives the fire detection constant current (I1) to the line.

An address type fire detection device and a fire detection system using a voltage controlled current source according to an embodiment of the present invention,

By using the voltage-controlled current source controlled by the digital-to-analog converter, it is possible to operate using only the power line without additionally providing a communication line.

Further, each of the fire detection constant currents is driven by using the output voltage V0 determined by the address code value and the reference voltage VREF output from the adder having two inputs of the switching element voltage V _SCR fed back. The fire detection constant current driven by the address type fire detector can be easily set to be proportional to the address code value.

FIG. 9 is a block diagram of a fire detection system 3 according to another embodiment of the present invention, and FIG. 10 is a view of an address type fire detection device 100-1 using a voltage controlled current source included in the fire detection system 3. It is a block diagram.

The fire detection system 3 according to the present embodiment includes only a brief configuration for clearly explaining the technical idea to be proposed.

9 and 10, the fire detection system 3 is configured to include a plurality of address type fire detection device 100, and a fire receiver 200.

Looking at the detailed configuration and the main operation of the fire detection system (3) configured as described above are as follows.

The plurality of address type fire detection apparatuses 100 are disposed at different places, respectively, and are configured to detect whether a fire is disposed at a place.

In addition, since a plurality of different address code values are set according to the location of the plurality of address type fire detection devices 100, the location of each address type fire detection device can be identified by setting the address code values.

The plurality of address type fire detection apparatuses 100 are set to different address code values according to the place where they are arranged, and are configured to be connected in parallel to the power line. The plurality of address type fire detection devices 100 respectively drive a fire detection constant current to a power line having a current value corresponding to its address code value when the fire detection sensor assigned thereto is activated.

For example, referring to the first address type fire detection device 100-1 among the plurality of address type fire detection devices 100,

When the fire detection sensor of the first address type fire detection device 100-1 becomes active-fire detection state, the first address type fire detection device 100-1 receives a current value corresponding to its own address code value. The first fire detection constant current I1 having is driven by a power line.

In addition, when the fire detection sensor of the second address type fire detection device 100-2 becomes active-fire detection state, the second address type fire detection device 100-2 is a current corresponding to its own address code value. The second fire detection constant current I2 having the value is driven to the power line.

At this time, the current value of the first fire detection constant current I1 and the current value of the second fire detection constant current I2 are determined by the address code value set in its own address setting section.

The fire receiver 200 determines whether at least one address type fire detection device of the plurality of address type fire detection devices 100 is operated-whether or not the fire is detected-based on the current value flowing through the power line, and then determines the place where the fire occurred. It is configured to be displayed.

이라고 하면, 모든 장소에서 화재가 발생하지 않은 상태에서의 전원라인에는 기본전류 I_normal =

의 전류가 흐른다.For example, when all of the fire detection sensors of the plurality of address type fire detection devices 100 are not active, it is defined as a state where no fire occurs in every place. At this time, since all the plurality of address type fire detection devices 100 do not drive the fire detection constant current, the basic current I _terminal by the _terminal resistor R _terminal flows through the power supply line. That is, the current flowing through the N fire detectors basically

In this case, if the power line does not occur in all places, the basic current I _normal =

Current flows.

At this time, the fire detection sensor of the first address type fire detection device (100-1) is active-fire detection state-the current value corresponding to the address code value of the first address type fire detection device (100-1) When driving the first fire detection constant current (I1) having a

Since the first address type fire detection apparatus 100-1 is connected in parallel with the power line, the total current value I flowing through the power line is determined by the basic current I _normal and the first fire detection constant current I1. It is defined as the sum.

Therefore, the fire receiver 200 detects the total current value I flowing through the power line, and determines that the first address type fire detection device 100-1 is active-a fire detection state, and the first address type fire detection device. The display module indicates that a fire has occurred in an area in which 100-1 is located.

In addition, the fire detection sensor of the first address type fire detection device (100-1) is active-fire detection state-the current value corresponding to the address code value of the first address type fire detection device (100-1) Drive the first fire detection constant current (I1) having:

The fire detection sensor of the second address type fire detection device 100-2 becomes active-the fire detection state-so that the second address type fire detection device 100-2 has a current value corresponding to its own address code value. When driving the second fire detection constant current (I2),

Since the first address type fire detection device 100-1 and the second address type fire detection device 100-2 are connected in parallel with the power supply line, the total current value I flowing through the power supply line is determined by the basic current ( I _normal ), the first fire detection constant current I1 and the second fire detection constant current I2 are defined as the sum.

Accordingly, the fire receiver 200 detects the total current value I flowing through the power line and determines that the first and second address type fire detection devices 100-1 and 100-2 are active-fire detection state. In addition, the display module indicates that a fire has occurred in a region where the first and second address type fire detection devices 100-1 and 100-2 are located.

The configuration and operation of the fire detection system 3 will be described in more detail as follows.

The fire receiver 200 includes a current detector (R _sense , amplifier), a microcomputer (MCU) having a CPU and an analog to digital converter (ADC), and a display module. The 'current detector' of the fire receiver 200 detects the current I flowing through the + 24V power line through a resistor R _sense and amplifies it with an amplifier.

'Micom' receives the output voltage of the amplifier through the ADC (Analog to Digital Converter) and finds out whether it is in a normal state and the address of the fire detector (address type fire detector) (i.e. where the fire occurred) Display module '. The display module is a device that displays information received from the microcomputer, that is, whether it is in a normal state and a location of a fire.

Each of the plurality of address type fire detection devices 100 is defined as an 'address type fire detection device using a voltage controlled current source', and the detailed configuration of the address type fire detection device 100-1 is illustrated in FIG. 10. That is, each address type fire detection device includes an address setting unit 110, a fire signal conversion unit 142, a fire detection sensor 141, a microprocessor 120, a voltage control current source circuit unit 130, and a voltage regulator 152. And a switching circuit 151.

The address setting unit 110 is composed of a dip switch and resistors. The address setting unit 110 sets an address (i) of an address type fire detection device using a dip switch, and the set address (i) is an input of the microprocessor 120. The parallel port 121 is sent to the CPU 123. That is, the address setting unit 110 generates an address code value corresponding to the electrical connection state of each of the plurality of switches.

The fire signal converting unit 142 converts an output signal of the fire detection sensor 141 into a voltage signal and transmits the signal to an input signal of an analog to digital converter (ADC) 125 embedded in the microprocessor 120. The microprocessor 120 compares the fire-related signal received from the fire signal converting unit 142 with the fire determination set value, and if it is determined that the fire is a voltage Vo of the output parallel port 122-a switching control signal Vo. To switch the switching circuit 151 to 5 [V] by outputting a voltage Vo of the output parallel port 122-a switching control signal Vo-to 0 [V] if it is determined that it is not a fire. It functions to turn on / off.

In addition, when it is determined that the fire is a fire, the DAC having the reference voltage V _REF corresponding to the address (i) of the address type fire detection device received through the input parallel photo 121 is included in the microprocessor 120. (Digital to Analog Convertor, 124). That is, the microprocessor 120 generates a reference voltage V _REF having a voltage level corresponding to the address code value.

When the voltage control current source circuit unit 130 is determined to be a fire, the voltage Vo of the output parallel port 122-the switching control signal Vo-is 5 [V], so that the switch of the switching circuit 151 operates and the DAC ( A current I _iR corresponding to the output voltage V _REF of 124 flows through the resistor R. That is, the voltage control current source circuit unit 130 has a fire detection constant current having a current value corresponding to the voltage level of the reference voltage V _REF under the control of the reference voltage V _REF when the fire detection sensor 141 is activated. To drive.

The switching circuit 151 is the voltage Vo of the output parallel port 122 of the microprocessor 120-the switching control signal Vo. If this is 5 [V], the switching circuit 151 +24 [V] to the voltage control current source circuit 130. ] And the voltage (Vo) of the output parallel port 122-the switching control signal (Vo)-if 0 [V], the +24 [V] function is cut off to the voltage control current source circuit unit 130. do.

Meanwhile, FIG. 9 illustrates a case in which N address type fire detection devices 100-1, 100-2,..., 100 -N are connected to the fire receiver 200.

In the address type fire detection apparatus 100-1, the switching circuit is the voltage Vo of the output parallel port 122-the switching control signal Vo in the normal state in which the fire does not occur. The voltage supply of +24 [V] is cut off to the current source circuit unit 130, and when it is determined that a fire has occurred, the voltage of the output parallel port 122-the switching control signal Vo-is [5V]. A voltage of +24 [V] is supplied to the control current source circuit unit 130.

이다. 여기서 N은 화재 수신부(200)에 연결된 주소형 화재감지장치 수의 총 합이다.In the address type fire detection device 100-1, regardless of whether a fire occurs, the address setting unit 110, the fire signal conversion unit 142, and the microprocessor 120 of the address type fire detection device 100-1. The back should always be powered with +5 [V], so the current (I _i ) flowing through the address-type fire detection device at address i in the normal state without a fire is called I _i-normal . When the current I flowing through the resistor R _sense in the current detector of the receiver 200 is I _normal , I = I _normal =

to be. Where N is the total number of address type fire detection devices connected to the fire receiver 200.

If a fire occurs so as to further flows as a current (I _i) the I _{i- operation} than that of the normal condition flows into the address-type fire detection device when operating in the i-th address of the address-type fire detection device is a I _i I _i = I _i-normal + I _i-operation . At this time, the current I flowing through the resistor R _sense in the current detector of the fire receiver 200 also flows as much as I _i-operation compared to the normal state, so I is I = I _normal + I _i-operation . That is, in a normal state in which no fire occurs, a current of I = I _normal flows through the current detector resistance R _sense of the fire receiver 200, and when a fire occurs and the address type fire detection device at address i operates, the fire occurs. A current of I = I _normal + I _i- flows through the resistor R _sense of the current detector of the receiver 200. The size of I _i-operation depends on the address value (i) set in the address setting section of the address type fire detection system.

For example, if the address type fire detection apparatus 100-1 of address ₁ operates, the value of I _{1 operation} corresponding to address ₁ is [1 1], and the address type fire detection apparatus of address 2 is addressed. If (100-2) operates, the value of I _{2 operation} corresponding to address ₂ is [ ₂ ms].

On the other hand, the current detector of the fire receiver 200 detects the current I flowing through the +24 [V] power supply line with the voltage R _{sense ×} I applied to the resistor R _sense and amplifies K ₁ times with an amplifier. The microcomputer's built-in ADC converts the amplified voltage of K _{1 ×} R _{sense ×} I into a digital signal, and the CPU receives the converted result and processes the program to determine whether it is in a normal state and the address of an address type fire detection device that operates. , Location of fire).

In a normal state in which no fire has occurred, since a current of I = I _normal flows through the resistance (R _sense ) of the current detector of the fire receiver 200, the voltage value received by the CPU of the fire receiver 200 is K _{1 ×.} R _{sense x} I _normal . When a fire occurs and the address type fire detection device of address i operates, current of I = I _normal + I _i-operation flows through the resistance (R _sense ) of the current detector of the fire receiver 200 so that the fire receiver 200 The voltage value received by the CPU is C _{1 ×} R _{sense ×} (I _normal + I _i-operation ). Therefore, the voltage value received from the CPU of the fire receiving unit 200 is K _{1 ×} R _{sense ×} I _normal to K _{1 ×} R _{sense ×} (I _normal + I _i-operation ), as much as K _{1 ×} R _{sense ×} I _i-operation . As it increases, it can be judged that the address type fire detection device of address i has operated. The display module of the fire receiving unit 200 displays the normal state and the location of the fire.

Referring back to FIG. 10, the address type fire detection device 100-1 includes an address setting unit 110, a microprocessor 120, a fire detection sensor 141, a fire signal conversion unit 142, And a voltage controlled current source circuit unit 130, a voltage regulator 152, and a switching circuit 151.

Looking at the detailed configuration and main operation of the address-type fire detection device 100-1 configured as described above are as follows.

The address setting unit 110 generates an address code value corresponding to the electrical connection state of each of the plurality of switches. Since eight switches are provided in this embodiment, the (digital) address code values can be set by a combination of turn on and turn off of each switch.

That is, the address setting unit 110 is composed of a dip switch for setting an address and resistors. When the address of the address type fire detection device is set to i with the dip switch, the set address (i) is a microprocessor ( It is sent to the CPU 123 through the input parallel port 121 of 120.

The fire signal converting unit 142 is a circuit for converting the output signal of the fire detection sensor 141 into a voltage signal, the converted voltage signal is input to the analog (Analog to Digital Convertor, 125) built in the microprocessor 120 Is signaled. For reference, the fire detection sensor 141 may be configured as a fire detection sensor such as a heat detection sensor or a smoke detection sensor.

The microprocessor 120 has a CPU, an input parallel port, an analog to digital converter (ADC), a digital to analog converter (DAC), and an output parallel port. The microprocessor 120 compares the fire-related signal received from the fire signal converting unit 142 with the fire determination setting value, and when it is determined that the fire is a fire, the voltage of the output parallel port 122 is a switching control signal Vo. To switch the switching circuit 151 on by outputting to [5V] and outputting the voltage (Vo) of the output parallel port 122-the switching control signal (Vo) to [0V] if it is determined that there is no fire. ) / Off function.

In addition, the microprocessor 120 receives the address (i) of the address type fire detection device through the input parallel photo 121, and if it is determined that the fire is a voltage value corresponding to the address (i) of the address type fire detection device V _ref = R (I _i-Operation -I _i-OP ) [V] is exported through DAC (Digital to Analog Convertor) and if it is not a fire, V _ref = 0 [V] through DAC (Digital to Analog Convertor). .

Where I _i-OP is the current flowing to the power supply of the OP amplifier (operation amplifier) 131 in the voltage controlled current source circuit unit 130, and the value of I _{i -operation} is determined by the address setting unit 110 of the address type fire detection device. Can be set as a function of the set address value (i). For example, if I _{i -operation} = I _{Δ ×} i and I _Δ = 1 [μ], then I ₁ -operation = 1 [μ] and I _2-operation = 2 [μ].

The voltage controlled current source circuit unit 130 includes an operational amplifier (OP Amp, 131), a current driver 132 composed of a transistor and a resistor.

= I_i-동작 - I_i-op [A]이며, 주소형 화재감지장치의 +24[V] 전원선에 흐르는 전류(I_i)는 I_i-normal + I_i-R + I_i-OP = I_i-normal + I_i-동작 이다. If it is determined that a fire has occurred in the address type fire detection device at the address (i), the voltage Vo of the output parallel port 122-the switching control signal Vo is 5 [V], and the output voltage of the DAC. (V _ref ) is R (I _{i -operation} -I _i-op ) [V], so the current I _iR flowing through the resistor R is

= I _i-Operation -I _i-op [A], the current (I _i ) flowing through the +24 [V] power line of the address type fire detector is I _i-normal + I _iR + I _i-OP = I _i-normal + I _i-operation .

If it is determined that there is no fire, the output voltage V _ref of the DAC is 0 [V], and the voltage of the output parallel port 122 -Vo-the switching control signal Vo-is 0 [V]. Since power supply is cut off at 151 and I _iR is 0 [A] and I _i-OP is 0 [A], the current (I _i ) flowing through the +24 [V] power line of the address type fire detection device is I. _i-normal + I _iR + I _i-OP = I _i-normal .

The current (I _i ) flowing through the address type fire detection device at address i in the normal state without fire is I _i-normal , and the address type when the fire detection device operates at address i with the fire occurs. The current (I _i ) flowing through the fire detector is I _i-normal + I _i-operation , which flows as much as I _i-operation compared to the normal state.

In addition, the switching circuit 151 is a voltage Vo of the output parallel port 122-the switching control signal Vo-if 5 [V], the voltage of the +24 [V] voltage is applied to the voltage control current source circuit 130. If the voltage Vo of the output parallel port 122-the switching control signal Vo-is 0 [V], the voltage supply of +24 [V] is cut off to the voltage control current source circuit 130.

On the other hand, the voltage regulator 152 converts the 24V power supplied from the power line to 5V and supplies it to the internal circuit.

The operation principle of the address type fire detection apparatus and the operation principle of the fire receiver 200 will be described as follows.

-Operation principle of address type fire detection device

In FIG. 10, the address set by the address setting unit 110 may be treated as an address of the fire detection sensor 141 and may also be treated as an address of the 'address type fire detection device 100-1'. The address of the address type fire detection device set as the dip switch in the address setting unit 110 is sent to the CPU 123 through the input parallel photo 121 of the microprocessor 120.

The CPU 123 of the microprocessor 120 compares the output value of the fire signal conversion unit 142 received through the ADC 125 with the fire determination setting value, and when it is determined that the fire is a fire voltage of the output parallel port 122. ) To 5 [V], and if it is determined that it is not a fire, the voltage Vo of the output parallel port 122 is output to 0 [V].

In addition, when the CPU 123 determines that the fire is at the corresponding address (i) by the program, the voltage value corresponding to the address (i) of the address type fire detection device V _ref = R (I _i-operation -I _i-OP ) [ V] is sent through the DAC (Digital to Analog Convertor, 124), and if it is determined that there is no fire, V _ref = 0 [V] is sent out through the DAC (Digital to Analog Convertor, 124).

The switching circuit 151 supplies +24 [V] to the voltage control current source circuit unit 130 only when a fire occurs and cuts off the power supply in a normal state where no fire occurs. If it is determined that the fire is Vo = 5 [V], +24 [V] is supplied to the voltage controlled current source circuit unit 130. If it is determined that there is no fire, it is Vo = 0 [V] and thus +24 is supplied to the voltage controlled current source circuit unit 130. [V] is not powered.

[A]이며, 전압제어 전류원 회로부(130)에 흐르는 전류 I_i-R + I_i-OP는 (I_i-동작 - I_i-OP) + I_i-OP = I_i-동작이고, 주소형 화재감지장치의 +24[V] 전원선에 흐르는 전류(I_i) 는 I_i-normal + I_i-R + I_i-OP = I_i-normal + I_i-동작 이다. Therefore, when a fire occurs in the place where the address type fire detection device of the address (i) is installed, the voltage Vo of the output parallel port 122 of the microprocessor 120 is 5 [V] and the output voltage of the DAC 124. (Vref) is R (I _{i -Operation} -I _i-OP ) [V], so the current I _iR flowing in resistor R is

[A], and the current I _iR + I _i-OP flowing through the voltage controlled current source circuit unit 130 is (I _{i -operation} -I _i-OP ) + I _{i -OP} = I _{i -operation} , address type fire detection The current I _i flowing on the device's +24 [V] power line is I _i-normal + I _iR + I _i-OP = I _i-normal + I _i-operation .

On the other hand, if a fire does not occur, the voltage Vo of the output parallel port 122 of the microprocessor 120 is 0 [V] and the output voltage V _ref of the DAC 124 is 0 [V]. In (R), the current (I _iR ) flowing is 0 [A], the current (I _i-OP ) flowing in the OP amplifier (Operating Amplifier) is also 0 [A], and the +24 [V] power supply of the address type fire detection device is The current I _i flowing in the line is I _{i -normal} . That is, the current (I _i ) flowing in the +24 [V] power line of the address type fire detector in the normal state without a fire is I _i-normal , and when a fire occurs, +24 of the address type fire detector [V] The current (I _i ) flowing through the power line is I _i-normal + I _{i- operation,} so it can be seen that a fire has occurred.

-Operation principle of the fire receiver 200

이다. 여기서 N은 화재 수신부(200)에 연결된 주소형 화재감지장치 수의 총합이다. 화재가 발생하지 않은 정상상태일 때, 화재 수신부(200)의 전류 검출부 저항(R_sense)에 I = I_normal 의 전류가 흐르므로 화재 수신부(200)의 CPU에서 받아들인 전압값은 K_1×R_sense×I_normal 이다. 9 and 10, in the normal state in which no fire occurs in the place where the address type fire detection device of the address (i) is installed, flows to the +24 [V] power line of the address type fire detection device of the address (i). If the current I _i is called I _i-normal and the current I flowing through the current detector resistance R _sense of the fire receiver 200 in the normal state is I _normal , I = I _normal =

to be. Where N is the total number of address type fire detection devices connected to the fire receiver 200. In a normal state in which no fire has occurred, since a current of I = I _normal flows in the current detector resistance R _sense of the fire receiver 200, the voltage value received by the CPU of the fire receiver 200 is K _{1 ×} R. _{sense x} I _normal .

+ I_terminal

이다.On the other hand, if a fire occurs in the place where the address type fire detection device of address (i) is installed, the current I _i flowing through the +24 [V] power line of the address type fire detection device of address ( _i ) is I _{i-. The} current value I flowing in the current detection resistance R _sense of the fire receiver 200 is _normal + I _i-operation .

+ I _terminal

to be.

If a fire occurs in the place where the address type fire detection device of address (i) is installed and the address type fire detection device of address i operates, the resistance of the current detection part (R _sense ) of the fire receiver 200 is I = I _normal + Since the current of the I _i-operation flows, the voltage value received by the CPU of the fire receiver 200 is K _{1 ×} R _sense (I _normal + I _i-operation ).

Therefore, the voltage value received from the CPU of the fire receiver 200 is K _{1 ×} R _{sens ×} I _normal to K _{1 ×} R _sense (I _normal + I _i-operation ), as much as K _{1 ×} R _{sense ×} I _i-operation . As it increases, it can be judged that the address type fire detection device of address i is in operation.

_×

Meanwhile, in the address type fire detection device of FIG. 10, the output signal of the fire signal conversion unit 142 is an analog voltage signal, and the signal is received by the CPU 123 through the ADC 125 embedded in the microprocessor 120. If it is determined that the fire is compared with the fire determination set value, the voltage Vo of the output parallel port 122 is set to 5 [V], and if it is determined that there is no fire, the voltage Vo of the output parallel port 122 is zero. Export to [V].

11 is another configuration diagram of the address type fire detection apparatus 100-1 using the voltage controlled current source included in the fire detection system 3.

Referring to FIG. 11, the function of determining whether such a fire has occurred is basically the same as that of the address type fire detection device of FIG. 10, and includes a microprocessor 120 having no ADC 125 compared to FIG. 10.

That is, as illustrated in FIG. 11, the address type fire detection device 100-1 includes an address setting unit 110, a fire detection sensor 141, a digital fire signal conversion unit 142A, an input parallel photo 121, A microprocessor 120 having an output parallel port 122, a CPU 123, and a DAC 124, a switching circuit 151, a voltage regulator 152, and a voltage controlled current source circuit 130 may be implemented. have.

 In FIG. 11, when the fire does not occur, the output of the digital fire signal converter 142A is 0 [V], and when the fire occurs, the output of the digital fire signal converter 142A is 5 [V]. The CPU 123 directly receives the output of the digital fire signal conversion unit 142A through the input parallel port 121 and sends this signal to the output parallel port 122. Therefore, when no fire occurs, the voltage Vo of the output parallel port 122 is 0 [V], and when the fire occurs, the voltage Vo of the output parallel port 122 is 5 [V].

In addition, if a fire does not occur by a program and the output of the digital fire signal converting unit 142A is 0 [V], the CPU 123 sends V _ref = 0 [V] through the DAC (Digital to Analog Convertor) and fires. Is generated and the output of the digital fire signal converter 142A is 5 [V], the voltage value corresponding to the address (i) of the address type fire detection device V _ref = R (I _i-operation -I _i-OP ) [ V] is exported via DAC (Digital to Analog Converter). The functions of the switching circuit 151 and the voltage controlled current source circuit unit 130 of FIGS. 10 and 11 are the same.

The address type fire detection device illustrated in FIG. 10 and the address type fire detection device illustrated in FIG. 11 have advantages and disadvantages, respectively. The address type fire detection device is advantageous in terms of price.

12 is a configuration diagram according to another embodiment of the voltage controlled current source circuit unit 130A.

In the address type fire detection apparatus 100-1 of FIGS. 10 and 11, the voltage controlled current source circuit unit 130 is configured as a suction type current sink using an npn type transistor, but as shown in FIG. It can also be implemented as a discharge type current source using a transistor of the type.

That is, the suction type current sink includes at least one NPN transistor under control of a reference voltage, and is composed of a suction sink circuit for driving a fire detection constant current to a power line.

이므로, I_i-동작 의 값을 I_i-R + I_i-OP 으로 하기 위한 V_ref 의 값은 24 - R(I_i-동작 - I_i-OP)이다. 따라서 마이크로프로세서(120)에 내장된 DAC(124)의 출력전압 V_ref 가 V_ref = 24 - R(I_i-동작 - I_i-OP) 이도록 프로그램하면 된다.In addition, as illustrated in FIG. 12, the discharge current source includes at least one PNP transistor under control of a reference voltage, and discharge current source circuit driving a fire detection constant current to a power line. It consists of. in this case

Therefore, the value of V _{ref for setting} the value of I _{i- operation} to I _iR + I _i-OP is 24-R (I _{i -operation} -I _i-OP ). Therefore, the output voltage V _ref of the DAC 124 built in the microprocessor 120 may be programmed such that V _ref = 24-R (I _{i -operation} -I _{i -OP} ).

이며, i번 주소의 주소형 화재감지장치에서 화재가 발생하면 화재 수신부(200)의 전류검출 저항(R_sense)에 흐르는 전류값 I는 I_normal + I_i-동작 으로 화재가 발생하지 않는 정상상태에 비해 I_i-동작 만큼 전류가 더 흐르므로 화재 발생 여부와 발생 주소 i를 알 수 있다.The address type fire detection device using the proposed voltage controlled current source and the fire detection system 3 including the same detect whether a fire occurs by detecting a current value I flowing through the current detection resistance R _sense of the fire receiver 200. It is a system to find out the fire address. The current value I flowing through the current detection resistance R _sense of the fire receiver 200 in the normal state where no fire occurs is I _normal =

If a fire occurs in the address type fire detection device at address i, the current value I flowing through the current detection resistance (R _sense ) of the fire receiver 200 is I _normal + I _i-operation . Compared with I _i-operation, more current flows, so it is possible to know whether the fire has occurred and the origin address i.

Therefore, as the value of I _normal is smaller than the value of I _i -operation, the fire detection accuracy of the address type fire detection device using the voltage controlled current source and the fire detection system including the same is lowered.

For reference, when comparing the fire detection system 2 of FIGS. 4 and 5 with the fire detection system 3 of FIGS. 9 to 11,

The fire detection system 2 of FIGS. 4 and 5 has several disadvantages compared to the fire detection system 3 of FIGS. 9 to 11.

의 값이 수 십 ㎃로 커진다. 여기서 N은 화재 수신부(200)에 연결된 주소형 화재감지장치 수의 총합이다. 예를 들어, 1㎃에서 60㎃ 사이의 값인 I_i-동작 의 값에 비하여 I_normal의 값이 수십 ㎃로 크게 되므로 전류 이용한 주소형 화재탐지 시스템의 정확성이 상대적으로 떨어진다. First, the two operational amplifiers OP 1 and OP 2 always operate regardless of whether or not a fire occurs, so that the value of I _i-normal increases in units of ,, and as a result, the current of the fire receiver 200 in a normal state where no fire occurs. I _normal = current value flowing through the _sense resistor (R _sense )

The value of increases to tens of microseconds. Where N is the total number of address type fire detection devices connected to the fire receiver 200. For example, compared to the value of I _i-operation , which is a value between 1 ㎃ and 60 I, the value of I _normal is increased to several tens of ㎃, so the accuracy of the current addressable fire detection system is relatively low.

Second, since the transistor Tr in the voltage controlled current source circuit portion 330 is not completely turned on or turned off, the transistor collector voltage V _f affects the performance of the voltage controlled current source circuit portion 330. Shines.

On the contrary, since the voltage control current source circuit unit 130 of FIGS. 10 and 11 selectively receives the driving power by the switching circuit 151, performance degradation due to leakage current may be prevented.

That is, the address type fire detection device using the voltage control current source of Figures 9 to 11 and the fire detection system including the same,

In order to reduce the value of I _i-normal (which is the value of I _normal ), which is the first disadvantage, voltage control the switching circuit 151 which cuts off the power supply of the voltage control current source circuit 130 in a normal state without a fire. The value of I _i -normal is reduced by arranging in front of the current source circuit unit 130.

In addition, in order to eliminate the influence of the transistor collector voltage V _{f, which} is caused by the second disadvantage, that the transistor Tr is not completely turned ON / OFF, the function of the transistor Tr is switched. As a side effect, I also reduced the value of I _i-normal by reducing one operational amplifier.

An address type fire detection device and a fire detection system using a voltage controlled current source according to an embodiment of the present invention, by using a voltage controlled current source controlled by a microprocessor, can operate using only a power line without additional communication lines. Can be.

Also, by driving the fire detection constant current using the reference voltage VREF having a voltage level corresponding to the address code value, the fire detection constant current driven by each address type fire detection device can be easily set to be proportional to the address code value. have.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100-1: Address type fire detection device
200: fire receiving unit
110: address setting unit
120 microprocessor
130: voltage control current source circuit
141: fire detection sensor
142: fire signal conversion unit
151: switching circuit
152: voltage regulator

Claims (9)

An address setting unit for generating an address code value corresponding to an electrical connection state of each of the plurality of switches;
A microprocessor for generating a reference voltage having a voltage level corresponding to the address code value; And
A voltage control current source circuit unit for driving a fire detection constant current having a current value corresponding to the voltage level of the reference voltage to a power line when the fire detection sensor is activated;
Address type fire detection device using a voltage controlled current source comprising a.
The method of claim 1,
And a switching circuit for selectively supplying driving power to the voltage control current source circuit unit under control of a switching control signal.
The switching control signal is generated in the microprocessor, the address type fire detection device using a voltage controlled current source, characterized in that it is selectively activated according to whether the fire detection sensor is active.
The method of claim 1,
The voltage control current source circuit portion,
At least one NPN transistor under the control of the reference voltage, address type fire using a voltage-controlled current source, characterized in that composed of a current sink (Current sink) circuit for driving the fire detection constant current to the power line. Sensing device.
The method of claim 1,
The voltage control current source circuit portion,
At least one PNP transistor under the control of the reference voltage, address-type fire using a voltage-controlled current source, characterized in that composed of a discharge-type current (Current source) circuit for driving the fire detection constant current to the power line Sensing device.
The different address code values are set according to the place where they are arranged and connected to each other in parallel to the power line, so that when the fire sensor assigned to them is activated, a fire detection constant current having a current value corresponding to the address code value of the device is activated. A plurality of address type fire detection devices respectively driven by the power lines; And
A fire receiver configured to determine whether at least one address type fire detection device is operated among the plurality of address type fire detection devices based on a current value flowing through the power line, and display a place where a fire has occurred;
Fire detection system comprising a.
The method of claim 5,
The plurality of address type fire detection device, respectively,
An address setting unit for generating an address code value corresponding to an electrical connection state of each of the plurality of switches;
A microprocessor for generating a reference voltage having a voltage level corresponding to the address code value; And
A voltage control current source circuit unit for driving a fire detection constant current having a current value corresponding to the voltage level of the reference voltage to a power line when the fire detection sensor is activated;
Fire detection system comprising a.
The method of claim 6,
The address type fire detection device,
And a switching circuit for selectively supplying driving power to the voltage control current source circuit unit under control of a switching control signal.
The switching control signal is generated in the microprocessor, the fire detection system, characterized in that selectively activated according to whether the fire sensor is active.
The method of claim 6,
The voltage control current source circuit portion,
And at least one NPN transistor under control of the reference voltage, wherein the fire detection system comprises a suction sink circuit driving the fire detection constant current to the power line.
The method of claim 6,
The voltage control current source circuit portion,
And at least one PNP transistor under the control of the reference voltage, wherein the fire detection system comprises a discharge current circuit driving the fire detection constant current to the power line.

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