CN103530969B - fire alarm controller loop unit and control method thereof - Google Patents
fire alarm controller loop unit and control method thereof Download PDFInfo
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- CN103530969B CN103530969B CN201310531437.3A CN201310531437A CN103530969B CN 103530969 B CN103530969 B CN 103530969B CN 201310531437 A CN201310531437 A CN 201310531437A CN 103530969 B CN103530969 B CN 103530969B
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Abstract
The present invention relates to a kind of fire alarm controller loop unit and control method thereof, central control unit, send address pulse signal and command pulse signal, and receive the digital signal of feedback; On-off circuit sends address pulse signal to the field apparatus on two lines bus, and provides working power; Pulse modulated circuit sends command pulse signal to the field apparatus on two lines bus; Return code current circuit, comprise high-side current mapping circuit, low side sample circuit and amplifying circuit, described high-side current mapping circuit and described low side are connected with amplifying circuit after adopting circuit to be connected; Amplifying circuit is connected with central control unit by analog to digital converter, circuit units control method of the present invention is under the prerequisite not improving baud rate, in same polling period, nearly up to a hundred sensing points are had to upload fire alarm information even if achieve, also can realize quoting within 2.1 second time simultaneously, greatly improve the response time of fire alarm.
Description
Technical field
The present invention relates to a kind of alarm controller, specifically a kind of fire alarm controller loop unit and control method thereof, belong to technical field of fire control.
Background technology
Fire alarm control unit is the heart of automatic fire alarm system, can power, have following function to detector: 1) be used for receiving fire signal and starting fire alarm installation.This equipment also can be used to instruction fire position and records for information about.2) start fire alarm signal by fire alarm dispensing device or start self-extinguishing equipment and fire protection linkage control equipment by automatic fire control fire control unit.3) automatically surveillance true(-)running and to specific fault to speaking, light reports to the police.
Modern fire alarm control unit is in order to reduce wrong report, facilitate installation and debugging, reduce I&M expense, reduce connecting line number, know the accurate location (domain number) of the fire detector sending warning timely and accurately, all generally adopt pulse-code-odulation system, and adopt two lines bus technology.
As disclosed a kind of two-bus communication responded fast fire and the fire alarm system adopting the method in Chinese patent CN1125421C " a kind of two-bus communication and use the fire alarm system of the method ".The process realizing response is fast by the addressed location grouping in each detection bus loop, after the addressed location with fire alarm interrupt priority produces fire alarm, signaling position correspondence position returns group number pulse by two lines bus to alarm controller, returning numbering pulse in passback group on code bit correspondence position, alarm controller calculates the address number of the addressed location producing fire signal and and alarm according to numbering in group number and group.
But judge in this invention that a warning address just at least needs 50ms, when there is N many alarm set points, controller just needs N × 50ms to process to judge warning address, needs the time longer, is unfavorable within the shortest time and alarm.
Summary of the invention
The present invention will solve multiple-way system transmission line of the prior art and there is the problem that quantity is large, total failure rate is high, time of fire alarming is longer, the present invention adopts the power supply of independent research and communication, controls and the nonpolarity two lines bus mode of digitizing of reporting to the police in one, under the prerequisite not improving baud rate, in same polling period, nearly up to a hundred sensing points are had to upload fire alarm information even if achieve, also can realize quoting within 2.1 second time simultaneously, greatly improve the response time of fire alarm.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of fire alarm controller loop unit, comprises
Central control unit, sends address pulse signal and command pulse signal, and receives the digital signal of feedback;
On-off circuit, is connected with the output of pulse signal pin of described central control unit by negater circuit, and is connected with two lines bus high level line, sends address pulse signal, and provide working power to the field apparatus on two lines bus;
Pulse modulated circuit, is connected with the command pulse signal output pin of described central control unit by negater circuit, and is connected with two lines bus high level line, sends command pulse signal to the field apparatus on two lines bus;
Return code current circuit; comprise high-side current mapping circuit, low side sample circuit and amplifying circuit; described high-side current mapping circuit is connected respectively with two lines bus high level line and low level line; described low side sample circuit is connected with the low level line of described two lines bus, and described high-side current mapping circuit and described low side are connected with amplifying circuit after adopting circuit to be connected;
Analog to digital converter, is connected respectively with described time code current circuit and central control unit, inputs central control unit after the signal of described time decoding circuit circuit is carried out analog to digital conversion;
Field apparatus: be connected with the high level line of two lines bus and low level line, receives the signal on two lines bus.
Also comprise pulse shaping circuit, be connected with described on-off circuit and pulse modulated circuit, export to field apparatus by after described command pulse signal and address pulse signal shaping.
Also comprise short-circuit detecting circuit, be connected respectively with described two lines bus high level line and described analog to digital converter, detect the electric signal of described two lines bus and input described analog to digital converter.
Being provided with short circuit indicating device in described short-circuit detecting circuit, indicating when being short-circuited state.
The fire alarm controller loop unit control method of fire alarm controller loop unit, comprises the following steps:
(1) first to the address code that each field device configurations one of circuit units connection is unique;
(2) send synchronization pulse by central control unit to two lines bus, the signal returned by two lines bus records the background current size on two lines bus;
(3) central control unit OPADD pulse signal, described address rushes signal after negater circuit second, sends address pulse signal by described on-off circuit to the field apparatus on two lines bus;
(4) field apparatus receive described synchronization pulse carry out synchronous after, after receiving the described address pulse signal identical with oneself address code, by time code current circuit return path signal on two lines bus, described return path signal converts to through analog to digital converter and sends into central control unit after digital signal and process, and draws the duty of field apparatus;
(5) when described central control unit judges that field apparatus sends warning message, described central control unit exports command pulse signal, after oppositely, send command pulse signal to the field apparatus on the two lines bus of correspondence by pulse modulated circuit, after corresponding field apparatus of reporting to the police receives this command pulse signal, start actuation of an alarm.
In described step (3), before the field apparatus on two lines bus sends address pulse signal, also comprise the step of being carried out shaping pulse by pulse shaping circuit.
In described step (5), send command pulse signal to also comprising the step of being carried out shaping pulse by pulse shaping circuit before the field apparatus on the two lines bus of correspondence.
In whole process, also comprise the step that short-circuit detecting circuit detects two lines bus whether short circuit.
Described short-circuit detecting circuit is indicated by short circuit indicating device when two lines bus short circuit being detected.
A described address cycle pulse is 8ms, in described address cycle pulse, No. 0 address is used for measuring background current, in described address cycle pulse, voltage to be 24V pulsewidth be 4ms's is address/power pulses, and wherein voltage to be 10V pulsewidth be 4ms's is the time slot of instruction/reception.
Described time code current pulse comprises the categorical data of 4Bit position 2ms pulsewidth and the status data of 4Bit position 2ms pulsewidth.
The disposal route of described step (4) central control unit is, when being 20mA after described time code current subtracting background electric current, described central control unit is judged to be " 1 ", and during for 6mA, described central control unit is judged to be " 0 ".
The address pulse signal output pin of the central control unit in described circuit units is connected with the first input end of the first NAND gate circuit U2A, second input end of described first NAND gate circuit U2A is connected with its first input end, the output terminal of described first Sheffer stroke gate U2A is connected to resistance R5 one end and described on-off circuit input end, the other end of described resistance R5 is connected to the base stage of triode T2, the collector of described triode T2 is connected to the base stage of power switch pipe T1 by resistance R4, the collector of described power switch pipe T1 is connected with two lines bus high level line L+, the emitter of described power switch pipe T1 is connected with its base stage by resistance R3, the emitter of described power switch pipe T1 is also connected with external 24V power supply.
The command pulse signal output pin of described central control unit is connected with the first input end of the second Sheffer stroke gate U3A, second input end of described second Sheffer stroke gate U3A is connected with its first input end, the output terminal of described second Sheffer stroke gate U3A is connected with one end of the input end of described pulse modulated circuit and resistance R10, the other end of described resistance R10 is connected to the base stage of triode T5, the collector of described triode T5 is connected to external 24V power supply by resistance R11, described external 24V power supply is also connected to the input end of three-terminal voltage-stabilizing pipe T11, the collector of described triode T5 is also connected to the base stage of triode T6, the emitter of described triode T6, one end of resistance R12 is connected with the emitter of triode T5 with after one end parallel connection of electric capacity C2, the collector of described triode T6, the adjustment end of three-terminal voltage-stabilizing pipe T11 is connected to after the other end of resistance R12 and the other end parallel connection of electric capacity C2, resistance R13 is connected between the output terminal of three terminal regulator T11 and adjustment end, the resistance R15 of output terminal also by connecting successively of described three terminal regulator T11, R16 is connected to the anode of diode D1, the negative electrode of described diode D1 is connected to the high level line L+ of two lines bus.
Described in described time code current circuit, high-side current mapping circuit is connected with two lines bus two ends, in described high-side current mapping circuit, the collector of triode T7 is connected with the low level line L-of described two lines bus, the emitter of described triode T7 is connected between the output terminal of resistance R15 and three-terminal voltage-stabilizing pipe T11 by resistance R14, the base stage of described triode T7 is connected with the output terminal of operational amplifier U4A, the reverse input end of described operational amplifier U4A is connected with the emitter of triode T7, the positive input of described operational amplifier U4A is connected between resistance R15 and R16, the plus earth of described operational amplifier, its negative pole connects external 24V power supply, the low level line L-of described two lines bus is also connected with the input end of amplifying circuit and the positive input of operational amplifier U4B, described low side sample circuit is sampling resistor R19, the positive input of described operational amplifier U4B is connected to after one end of described sampling resistor R19 is in parallel with the anode of electric capacity D2, be connected to the input end anyway of described operational amplifier U4B by resistance R18 after the other end of sampling resistor R19 is in parallel with the negative electrode of electric capacity D2, the parallel connection point ground connection of described resistance R18 and R19, resistance R17 be connected to operational amplifier U4B output terminal and anyway between input end, the output terminal of described operational amplifier U4B is the output terminal of described amplifying circuit, it is connected to the IN0 input end of analog to digital converter U1.
One end of the output terminal of described second Sheffer stroke gate U3A also contact resistance R7, one end of the output terminal of described first NAND gate circuit U2A also contact resistance R6, be connected with the input end of described pulse shaping circuit after the other end parallel connection of described resistance R7 with R6, the input end of described pulse shaping circuit is the base stage of triode T4, the emitter of described triode T4 is connected and ground connection with the emitter of triode T2 with the parallel connection point of the emitter of triode T3, two lines bus high level line L+ is connected to by resistance R8 after the collector of described triode T4 is in parallel with the base stage of triode T3, the collector of described triode T3 is connected to two lines bus high level line L+ by resistance R9.
The IN1 input end of described analog to digital converter U1 is connected to the input end of described short-circuit detecting circuit and one end of resistance R1, the other end of described resistance R1 is connected to short circuit indicating device, described short circuit indicating device is luminotron L1, the negative electrode of described luminotron L1 is connected with resistance R1, the anode of described luminotron L1 is connected to the high level line L+ of two lines bus, one end ground connection after resistance R2 is in parallel with electric capacity C1, the other end is connected to the IN1 input end of analog to digital converter U1.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) fire alarm controller loop unit of the present invention and control method thereof, possess function of supplying power simultaneously, simplifies communication line, again can real-time detecting system equipment working state; Bus bit efficiency, signal amplitude are high and low resistive, and have the features such as long transmission distance, reliability are high, failure rate is low, transmission range can reach 1500 meters farthest.
(2) fire alarm controller loop unit of the present invention and control method thereof, also comprise pulse shaping circuit, be connected with described on-off circuit and pulse modulated circuit, field apparatus is exported to by after described command pulse signal and address pulse signal shaping, described pulse shaping circuit can avoid capacitive load on the impact of the circuit of two lines bus structure, thus improves the anti-interference of data communication.
(3) fire alarm controller loop unit of the present invention and control method thereof, comprise short-circuit detecting circuit, short circuit indicating device is provided with in described short-circuit detecting circuit, indicate when being short-circuited state, failure problems can be reacted timely, so that quick solution circuit question, avoids because fault does not safeguard in time and fails to report fire condition.
(4) fire alarm controller loop unit of the present invention and control method thereof, adopt the power supply of independent research and communication, control and the nonpolarity two lines bus mode of digitizing of reporting to the police in one, under the prerequisite not improving baud rate, in same polling period, nearly up to a hundred sensing points are had to upload fire alarm information even if achieve, also can realize quoting within 2 second time, the greatly high response time of fire alarm simultaneously.
(5) fire alarm controller loop unit of the present invention and control method thereof, a described address cycle pulse is 8ms, in described address cycle pulse, No. 0 address is used for measuring background current, in described address cycle pulse, voltage to be 24V pulsewidth be 4ms's is address/power pulses, wherein voltage to be 10V pulsewidth be 4ms's is the time slot of instruction/reception, the address of patrolling and examining of circuit units of the present invention is only formed with the square wave of 1 4ms high level line and 4ms low level line, there is pulsewidth wide, the address of a baud position is only had to patrol and examine code, interference free performance is very high, patrol and examine per-word error probability extremely low.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein,
Fig. 1 is the block diagram of fire alarm controller loop unit of the present invention;
Fig. 2 is the process flow diagram of fire alarm controller loop unit control method of the present invention;
Fig. 3 is the circuit diagram of fire alarm controller loop unit of the present invention;
Fig. 4 is the oscillogram of each pulse in fire alarm controller loop unit of the present invention.
Embodiment
Some specific embodiments of fire alarm controller loop unit of the present invention and control method thereof are provided below.
embodiment 1
Fire alarm controller loop unit of the present invention comprises as shown in Figure 1:
Central control unit, sends address pulse signal and command pulse signal, and receives the digital signal of feedback;
On-off circuit, is connected with the output of pulse signal pin of described central control unit by negater circuit, and is connected with two lines bus high level line, sends address pulse signal, and provide working power to the field apparatus on two lines bus;
Pulse modulated circuit, is connected with the command pulse signal output pin of described central control unit by negater circuit, and is connected with two lines bus high level line, sends command pulse signal to the field apparatus on two lines bus;
Return code current circuit; comprise high-side current mapping circuit, low side sample circuit and amplifying circuit; described high-side current mapping circuit is connected respectively with two lines bus high level line and low level line; described low side sample circuit is connected with the low level line of described two lines bus, and described high-side current mapping circuit and described low side are connected with amplifying circuit after adopting circuit to be connected;
Analog to digital converter, is connected respectively with described time code current circuit and central control unit, inputs central control unit after the signal of described time decoding circuit circuit is carried out analog to digital conversion;
Field apparatus: be connected with the high level line of two lines bus and low level line, receives the signal on two lines bus.
embodiment 2
On the basis of fire alarm controller loop unit described in embodiment 1, also comprise pulse shaping circuit, be connected with described on-off circuit and pulse modulated circuit, scene is exported to by after described command pulse signal and address pulse signal shaping, described pulse shaping circuit can avoid capacitive load on the impact of the circuit of two lines bus structure, thus improves the anti-interference of data communication.
embodiment 3
On the basis of the fire alarm controller loop unit described in above embodiment, also comprise short-circuit detecting circuit, be connected respectively with described two lines bus high level line and described analog to digital converter, detect the electric signal of described two lines bus and input described analog to digital converter.
Being provided with short circuit indicating device in described short-circuit detecting circuit, indicating when being short-circuited state, failure problems can be reacted timely, so that quick solution circuit question, avoid because fault does not safeguard in time and fail to report fire condition.
embodiment 4
The control method of fire alarm controller loop unit of the present invention as shown in Figure 2, comprises the following steps:
(1) first to the address code that each field device configurations one of circuit units connection is unique;
(2) send synchronization pulse by central control unit to two lines bus, the signal returned by two lines bus records the background current size on two lines bus;
(3) central control unit OPADD pulse signal, described address rushes signal after negater circuit second, sends address pulse signal by described on-off circuit to the field apparatus on two lines bus;
(4) field apparatus receive described synchronization pulse carry out synchronous after, after receiving the described address pulse signal identical with oneself address code, by time code current circuit return path signal on two lines bus, described return path signal converts to through analog to digital converter and sends into central control unit after digital signal and process, and draws the duty of field apparatus;
(6) when described central control unit judges that field apparatus sends warning message, described central control unit exports command pulse signal, after oppositely, send command pulse signal to the field apparatus on the two lines bus of correspondence by pulse modulated circuit, after corresponding field apparatus of reporting to the police receives this command pulse signal, start actuation of an alarm.
embodiment 5
On the basis of embodiment 4, in described step (3), before the field apparatus on two lines bus sends address pulse signal, also comprise the step of being carried out shaping pulse by pulse shaping circuit; In described step (6), send command pulse signal to also comprising the step of being carried out shaping pulse by pulse shaping circuit before the field apparatus on the two lines bus of correspondence; In whole process, also comprise the step that short-circuit detecting circuit detects two lines bus whether short circuit; Described short-circuit detecting circuit is indicated by short circuit indicating device when two lines bus short circuit being detected.
A described address cycle pulse is 8ms, as shown in Figure 4, a polling period preferably comprises 1 synchronizing cycle and 256 address cycle pulses, in described address cycle pulse, No. 0 address is used for measuring background current, in described address cycle pulse, voltage to be 24V pulsewidth be 4ms's is address/power pulses, wherein voltage to be 10V pulsewidth be 4ms's is the time slot of instruction/reception, the addressing field apparatus realizing patrolling and examining one-period only needs 2.1s, and the address of patrolling and examining of circuit units of the present invention is only formed with 1 4ms high level and the low level square wave of 4ms, there is pulsewidth wide, the address of a baud position is only had to patrol and examine code, interference free performance is very high, patrol and examine per-word error probability extremely low.
Described central control unit preferably adopts single-chip microcomputer, described central control unit sends 100ms synchronizing pulse and measures background current, first the background current recording bus can avoid next receiving addressing field apparatus when returning coded signal, avoid the working current of field apparatus, insulation leakagel volume leakage electric currents etc. are on the impact detecting back code data signal, after field apparatus receives the address code identical with oneself address, preferably return the 8Bit bit data that is made up of type and status code in bus with digitizing current system respectively according to the order of sequence at bus DC10V pulse groove, described time code current pulse preferably comprises the categorical data of 4Bit position 2ms pulsewidth and the status data of 4Bit position 2ms pulsewidth, the disposal route that described step (4) central control unit judges field device operation state preferably described return code current subtracting background electric current after as 20mA time, described central control unit is judged to be " 1 ", and during for 6mA, described central control unit is judged to be " 0 ".
embodiment 6
On the basis of the fire alarm controller loop unit described in above embodiment, as shown in Figure 3, the address pulse signal output pin of the central control unit J1 in described circuit units is connected with the first input end of the first NAND gate circuit U2A, describedly to be connected with its first input end with second input end of the first NAND gate circuit U2A, the output terminal of described first Sheffer stroke gate U2A is connected to resistance R5 one end and described on-off circuit input end, the other end of described resistance R5 is connected to the base stage of triode T2, the collector of described triode T2 is connected to the base stage of power switch pipe T1 by resistance R4, the collector of described power switch pipe T1 is connected with two lines bus high level line L+, the emitter of described power switch pipe T1 is connected with its base stage by resistance R3, the emitter of described power switch pipe T1 is also connected with external 24V power supply.
The command pulse signal output pin of described central control unit J1 is connected with the first input end of the second Sheffer stroke gate U3A, second input end of described second Sheffer stroke gate U3A is connected with its first input end, the output terminal of described second Sheffer stroke gate U3A is connected with one end of the input end of described pulse modulated circuit and resistance R10, the other end of described resistance R10 is connected to the base stage of triode T5, the collector of described triode T5 is connected to external 24V power supply by resistance R11, described external 24V power supply is also connected to the input end of three-terminal voltage-stabilizing pipe T11, the collector of described triode T5 is also connected to the base stage of triode T6, the emitter of described triode T6, one end of resistance R12 is connected with the emitter of triode T5 with after one end parallel connection of electric capacity C2, the collector of described triode T6, the adjustment end of three-terminal voltage-stabilizing pipe T11 is connected to after the other end of resistance R12 and the other end parallel connection of electric capacity C2, resistance R13 is connected between the output terminal of three terminal regulator T11 and adjustment end, the resistance R15 of output terminal also by connecting successively of described three terminal regulator T11, R16 is connected to the anode of diode D1, the negative electrode of described diode D1 is connected to the high level line L+ of two lines bus.
Described in described time code current circuit, high-side current mapping circuit is connected with two lines bus two ends, in described high-side current mapping circuit, the collector of triode T7 is connected with the low level line L-of described two lines bus, the emitter of described triode T7 is connected between the output terminal of resistance R15 and three-terminal voltage-stabilizing pipe T11 by resistance R14, the base stage of described triode T7 is connected with the output terminal of operational amplifier U4A, the reverse input end of described operational amplifier U4A is connected with the emitter of triode T7, the positive input of described operational amplifier U4A is connected between resistance R15 and R16, the plus earth of described operational amplifier, its negative pole connects external 24V power supply, the low level line L-of described two lines bus is also connected with the input end of amplifying circuit and the positive input of operational amplifier U4B, described low side sample circuit is sampling resistor R19, the positive input of described operational amplifier U4B is connected to after one end of described sampling resistor R19 is in parallel with the anode of electric capacity D2, be connected to the input end anyway of described operational amplifier U4B by resistance R18 after the other end of sampling resistor R19 is in parallel with the negative electrode of electric capacity D2, the parallel connection point ground connection of described resistance R18 and R19, resistance R17 be connected to operational amplifier U4B output terminal and anyway between input end, the output terminal of described operational amplifier U4B is the output terminal of described amplifying circuit, it is connected to the IN0 input end of analog to digital converter U1.
embodiment 7
On the basis of the fire alarm controller loop unit described in above embodiment, one end of the output terminal of described second Sheffer stroke gate U3A also contact resistance R7, one end of the output terminal of described first NAND gate circuit U2A also contact resistance R6, be connected with the input end of described pulse shaping circuit after the other end parallel connection of described resistance R7 with R6, the input end of described pulse shaping circuit is the base stage of triode T4, the emitter of described triode T4 is connected and ground connection with the emitter of triode T2 with the parallel connection point of the emitter of triode T3, two lines bus high level line L+ is connected to by resistance R8 after the collector of described triode T4 is in parallel with the base stage of triode T3, the collector of described triode T3 is connected to two lines bus high level line L+ by resistance R9, described pulse shaping circuit can avoid capacitive load on the impact of the circuit of two lines bus structure, thus improve the anti-interference of data communication.
embodiment 8
The basis of the fire alarm controller loop unit described in above embodiment also comprises short-circuit detecting circuit, the IN1 input end of described analog to digital converter U1 is connected to the input end of described short-circuit detecting circuit and one end of resistance R1, the other end of described resistance R1 is connected to short circuit indicating device, described short circuit indicating device is luminotron L1, the negative electrode of described luminotron L1 is connected with resistance R1, the anode of described luminotron L1 is connected to the high level line L+ of two lines bus, one end ground connection after resistance R2 is in parallel with electric capacity C1, the other end is connected to the IN1 input end of analog to digital converter U1.
Fire alarm controller loop unit of the present invention each circuit working principle is as follows:
The central control unit J1 of described circuit units sends address pulse signal after reverse with the first not circuit U2 to P1 port, the on-off circuit of resistance R3, R4, R5 composition through power switch pipe T1 and periphery, address pulse signal is sent, simultaneously for detector, module etc. provide working power to the field apparatus on two lines bus high level line L+.When P1 message number is high level, make triode T2 conducting by resistance R5, thus make power switch pipe T1 conducting, P1 message number makes triode T4 conducting by resistance R5 simultaneously, and triode T3 ends, and high level line L+ exports 24V high level.When P1 message number is low level, triode T2 ends, triode T3 conducting, thus power switch pipe T1 is also ended, and high level line L+ exports 0V low level.
Described central control unit J1 sends command pulse signal after reverse with the second not circuit U3 to P0 port, 0-10V voltage is exported after the pulse modulated circuit be made up of three-terminal voltage-stabilizing pipe T11, triode T5, T6 and peripheral resistance R10, R11, R12, R13 and electric capacity C2, send command pulse signal to the field apparatus on two lines bus, supply back code receiving test circuit to work simultaneously.Described three-terminal voltage-stabilizing pipe preferably adopts LM317, filter capacitor C2 Main Function be the pulse voltage that reduces to export with radio-frequency component, suppress self-sustained oscillation and reduce the ripple that brings of external interference.When P0 message number is high level, make triode T5 conducting by resistance R10, triode T6 ends, thus makes three-terminal voltage-stabilizing pipe T11 export 10.6V high level, and high level line L+ exports 10V high level; When P0 message number is low level, triode T5 ends, triode T6 conducting, thus makes three-terminal voltage-stabilizing pipe T11 export 1.2V low level, and high level line L+ exports 0V low level.High level line L+ sends into detector detector, module etc. after exporting the pulse shaping circuit of resistance R6, R7, R8, R9 composition again through triode T3, T4 and periphery, and shaping circuit can avoid capacitive load on the impact of bus-structured circuit.
The code Received signal strength that returns of described circuit units is by returning code current circuit, comprises that high-side current mapping circuit, low side sample circuit and amplifying circuit realize, go back to code current one tunnel through two lines bus low level line end L-, pulse voltage is formed after sampling sampling resistor R19, sample through resistance R15 in another road, operational amplifier U4A and triode T7, the high level line end electric current mapping circuit that resistance R14 forms, being added to the electric current of low level line end L-samples on sampling resistor R19, current signal transfers voltage signal to, again through operational amplifier U4B and resistance R17, signal is amplified output S0 by the amplifying circuit of R18 composition, S0 sends into central control unit J1 process after analog to digital converter U1 changes, the background current value that central control unit J1 adopts Different periods, marking current value, magnitude of voltage carries out fuzzy intelligence Algorithm Analysis process, draw the various running state information of field apparatus accurately.
Described short-circuit detecting circuit is made up of resistance R1, R2 and electric capacity C1, when in bus during circuit normal operation, on the L+ of loop, pulse voltage lights luminotron L1, instruction normal operating condition, again through resistance R1, R2 dividing potential drop, after electric capacity C1 filtering, export 2.5V pulse, enter from S1 port and send into central control unit J1 after analog to digital conversion circuit U1 converts digital signal to and carry out analyzing and processing.When bus short circuit, on the L+ of loop, pulse voltage is through diode D2 ground connection, thus power switch pipe T1 is ended, output low level line, luminotron L1 is extinguished, instruction short trouble state, the S1 Port detecting of analog to digital conversion circuit U1, to 0V voltage, is sent into central control unit J1 and is carried out analyzing and processing after converting digital signal to.
Obvious above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (15)
1. a fire alarm controller loop unit, is characterized in that, comprises
Central control unit, sends address pulse signal and command pulse signal, and receives the digital signal of feedback;
On-off circuit, is connected with the output of pulse signal pin of described central control unit by negater circuit, and is connected with two lines bus high level line, and the address pulse signal receiving described central control unit sends to the field apparatus on two lines bus, and provides working power;
Pulse modulated circuit, is connected with the command pulse signal output pin of described central control unit by negater circuit, and is connected with two lines bus high level line, and the command pulse signal receiving described central control unit sends to the field apparatus on two lines bus;
Return code current circuit; comprise high-side current mapping circuit, low side sample circuit and amplifying circuit; described high-side current mapping circuit is connected respectively with two lines bus high level line and low level line; described low side sample circuit is connected with the low level line of described two lines bus, and described high-side current mapping circuit and described low side are connected with amplifying circuit after adopting circuit to be connected;
Analog to digital converter, is connected respectively with described time code current circuit and central control unit, inputs central control unit after the signal of described time code current circuit is carried out analog to digital conversion;
Field apparatus: be connected with the high level line of two lines bus and low level line, receives the signal on two lines bus.
2. fire alarm controller loop unit according to claim 1, it is characterized in that, also comprise pulse shaping circuit, be connected with described on-off circuit and pulse modulated circuit, export to field apparatus by after described command pulse signal and address pulse signal shaping.
3. fire alarm controller loop unit according to claim 1 and 2, it is characterized in that: also comprise short-circuit detecting circuit, be connected respectively with described two lines bus high level line and described analog to digital converter, detect the electric signal of described two lines bus and input described analog to digital converter.
4. fire alarm controller loop unit according to claim 3, is characterized in that, is provided with short circuit indicating device in described short-circuit detecting circuit, indicates when being short-circuited state.
5. fire alarm controller loop unit according to claim 4, it is characterized in that, the address pulse signal output pin of described central control unit is connected with the first input end of the first NAND gate circuit U2A, second input end of described first NAND gate circuit U2A is connected with its first input end, the output terminal of described first Sheffer stroke gate U2A is connected to resistance R5 one end and described on-off circuit input end, the other end of described resistance R5 is connected to the base stage of triode T2, the collector of described triode T2 is connected to the base stage of power switch pipe T1 by resistance R4, the collector of described power switch pipe T1 is connected with two lines bus high level line L+, the emitter of described power switch pipe T1 is connected with its base stage by resistance R3, the emitter of described power switch pipe T1 is also connected with external 24V power supply.
6. fire alarm controller loop unit according to claim 5, it is characterized in that, the command pulse signal output pin of described central control unit is connected with the first input end of the second Sheffer stroke gate U3A, second input end of described second Sheffer stroke gate U3A is connected with its first input end, the output terminal of described second Sheffer stroke gate U3A is connected with one end of the input end of described pulse modulated circuit and resistance R10, the other end of described resistance R10 is connected to the base stage of triode T5, the collector of described triode T5 is connected to external 24V power supply by resistance R11, described external 24V power supply is also connected to the input end of three-terminal voltage-stabilizing pipe T11, the collector of described triode T5 is also connected to the base stage of triode T6, the emitter of described triode T6, one end of resistance R12 is connected with the emitter of triode T5 with after one end parallel connection of electric capacity C2, the collector of described triode T6, the adjustment end of three-terminal voltage-stabilizing pipe T11 is connected to after the other end of resistance R12 and the other end parallel connection of electric capacity C2, resistance R13 is connected between the output terminal of three terminal regulator T11 and adjustment end, the resistance R15 of output terminal also by connecting successively of described three terminal regulator T11, R16 is connected to the anode of diode D1, the negative electrode of described diode D1 is connected to the high level line L+ of two lines bus.
7. fire alarm controller loop unit according to claim 6, it is characterized in that, described in described time code current circuit, high-side current mapping circuit is connected with two lines bus two ends, in described high-side current mapping circuit, the collector of triode T7 is connected with the low level line L-of described two lines bus, the emitter of described triode T7 is connected between the output terminal of resistance R15 and three-terminal voltage-stabilizing pipe T11 by resistance R14, the base stage of described triode T7 is connected with the output terminal of operational amplifier U4A, the reverse input end of described operational amplifier U4A is connected with the emitter of triode T7, the positive input of described operational amplifier U4A is connected between resistance R15 and R16, the plus earth of described operational amplifier, its negative pole connects external 24V power supply, the low level line L-of described two lines bus is also connected with the input end of amplifying circuit and the positive input of operational amplifier U4B, described low side sample circuit is sampling resistor R19, the positive input of described operational amplifier U4B is connected to after one end of described sampling resistor R19 is in parallel with the anode of electric capacity D2, be connected to the reverse input end of described operational amplifier U4B by resistance R18 after the other end of sampling resistor R19 is in parallel with the negative electrode of electric capacity D2, the parallel connection point ground connection of described resistance R18 and R19, between the output terminal that resistance R17 is connected to operational amplifier U4B and reverse input end, the output terminal of described operational amplifier U4B is the output terminal of described amplifying circuit, it is connected to the IN0 input end of analog to digital converter U1..
8. fire alarm controller loop unit according to claim 7, it is characterized in that, one end of the output terminal of described second Sheffer stroke gate U3A also contact resistance R7, one end of the output terminal of described first NAND gate circuit U2A also contact resistance R6, be connected with the input end of described pulse shaping circuit after the other end parallel connection of described resistance R7 with R6, the input end of described pulse shaping circuit is the base stage of triode T4, the emitter of described triode T4 is connected and ground connection with the emitter of triode T2 with the parallel connection point of the emitter of triode T3, two lines bus high level line L+ is connected to by resistance R8 after the collector of described triode T4 is in parallel with the base stage of triode T3, the collector of described triode T3 is connected to two lines bus high level line L+ by resistance R9.
9. fire alarm controller loop unit according to claim 8, it is characterized in that, the IN1 input end of described analog to digital converter U1 is connected to the input end of described short-circuit detecting circuit and one end of resistance R1, the other end of described resistance R1 is connected to short circuit indicating device, described short circuit indicating device is luminotron L1, the negative electrode of described luminotron L1 is connected with resistance R1, the anode of described luminotron L1 is connected to the high level line L+ of two lines bus, one end ground connection after resistance R2 is in parallel with electric capacity C1, the other end is connected to the IN1 input end of analog to digital converter U1.
10., based on a control method for the fire alarm controller loop unit described in any one of claim 1-9, it is characterized in that, comprise the following steps:
(1) first to the address code that each field device configurations one of circuit units connection is unique;
(2) send synchronization pulse by central control unit to two lines bus, the signal returned by two lines bus records the background current size on two lines bus;
(3) central control unit OPADD pulse signal, described address pulse signal, after negater circuit, sends address pulse signal by described on-off circuit to the field apparatus on two lines bus;
(4) field apparatus receive described synchronization pulse carry out synchronous after, after receiving the described address pulse signal identical with oneself address code, by time code current circuit return path signal on two lines bus, described return path signal converts to through analog to digital converter and sends into central control unit after digital signal and process, and draws the duty of field apparatus;
(5) when described central control unit judges that field apparatus sends warning message, described central control unit exports command pulse signal, after oppositely, send command pulse signal to the field apparatus on the two lines bus of correspondence by pulse modulated circuit, after corresponding field apparatus of reporting to the police receives this command pulse signal, start actuation of an alarm.
11. fire alarm controller loop unit control methods according to claim 10, it is characterized in that: in described step (3), before the field apparatus on two lines bus sends address pulse signal, also comprise the step of being carried out shaping pulse by pulse shaping circuit.
12. fire alarm controller loop unit control methods according to claim 10 or 11, it is characterized in that: in described step (5), sending command pulse signal to also comprising the step of being carried out shaping pulse by pulse shaping circuit before the field apparatus on the two lines bus of correspondence.
13. fire alarm controller loop unit control methods according to claim 10, is characterized in that: in whole process, also comprise the step that short-circuit detecting circuit detects two lines bus whether short circuit.
14. fire alarm controller loop unit control methods according to claim 13, is characterized in that: indicated by short circuit indicating device when described short-circuit detecting circuit detects two lines bus short circuit.
15. fire alarm controller loop unit control methods according to any one of claim 13 or 14, it is characterized in that, the pulsewidth of described address pulse signal is 8ms, in described address pulse signal, No. 0 address is used for measuring background current, in described address pulse signal, voltage to be 24V pulsewidth be 4ms's is address/power pulses, and wherein voltage to be 10V pulsewidth be 4ms's is the time slot of instruction/reception.
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| CN104408855B (en) * | 2014-11-20 | 2017-01-11 | 中国船舶重工集团公司第七二六研究所 | Two bus loop communication system with bus arbitrator |
| CN106990730B (en) * | 2017-03-31 | 2019-11-01 | 四川赛科安全技术有限公司 | A kind of implementation method of device that realizing the remote large driven current density of fire-fighting bus |
| CN110276937B (en) * | 2019-05-29 | 2021-12-17 | 青鸟消防股份有限公司 | Hybrid control method of fire alarm bus and fire alarm system |
| CN110136410A (en) * | 2019-06-21 | 2019-08-16 | 山东众海公共安全器材有限公司 | A kind of two lines bus digital communication method of fire alarm and linkage control system |
| CN112929248B (en) * | 2019-12-05 | 2023-04-25 | 杭州海康消防科技有限公司 | Two-bus device and two-bus system |
| CN111767239B (en) * | 2020-09-02 | 2021-01-01 | 深圳市英美华科技有限公司 | One-master multi-slave power bus signal transmission method and device |
| CN111813723B (en) * | 2020-09-02 | 2021-02-02 | 深圳市英美华科技有限公司 | Power bus data transmission method and device and computer readable storage medium |
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