CN103530969A - 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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- CN103530969A CN103530969A CN201310531437.3A CN201310531437A CN103530969A CN 103530969 A CN103530969 A CN 103530969A CN 201310531437 A CN201310531437 A CN 201310531437A CN 103530969 A CN103530969 A CN 103530969A
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Abstract
The invention relates to a fire alarm controller loop unit and a control method thereof. The fire alarm controller loop unit is characterized in that a central controller is used for sending an address pulse signal and a command pulse signal and receiving a feedback digital signal; a switching circuit is used for sending an address pulse signal to field equipment on two buses, and providing a working power supply; a pulse modulation circuit is used for sending a command pulse signal to the field equipment on the two buses; a return code current circuit comprises a high-end current mapping circuit, a low-end sampling circuit and an amplifying circuit, and the high-end current mapping circuit is connected with the amplifying circuit after connected with the low-end sampling circuit; and the amplifying circuit is connected with the central controller through an analog-digital converter. According to the control method of the loop unit, on the premise that a baud rate is not increased, fire alarm information can be simultaneously reported in 2.1 seconds even though hundreds of detection points upload fire alarm information in the same polling period, so that the response time of fire alarm is shortened greatly.
Description
Technical field
The present invention relates to a kind of alarm controller, specifically a kind of fire alarm control unit circuit units and control method thereof, belong to fire prevention field.
Background technology
Fire alarm control unit is the heart of automatic fire alarm system, can power to detector, has following function: 1) be used for receiving fire signal and start fire alarm installation.This equipment also can be used to indicate fire position and record for information about.2) can start fire alarm signal or start self-extinguishing equipment and fire protection linkage control equipment by automatic fire control fire control unit by fire alarm dispensing device.3) the automatically true(-)running of surveillance and to specific fault spoken, 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 timely and accurately the accurate location (position numbering) of the fire detector that sends warning, all generally adopt pulse-code-odulation system, and adopt two bussing techniques.
As disclosed the fire alarm system of a kind of two-bus communication that fire is responded fast and employing the method in Chinese patent CN1125421C " fire alarm system of a kind of two-bus communication and use the method ".The process that realizes response is fast by the addressed location grouping in each detection bus loop, when thering is the addressed location of fire alarm interrupt priority, produce after fire alarm, on the correspondence position of signaling position, by two buses, to alarm controller, return group number pulse, on returning code bit correspondence position, in passback group, number pulse, alarm controller calculates address number and the alarm of the addressed location that produces fire signal according to numbering in group number and group.
But in this invention, judge that a warning address just at least needs 50ms, when there is many alarm set points of N, controller just needs N * 50ms to process judgement 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 have the problem that quantity is large, total failure rate is high, time of fire alarming is longer, the power supply that the present invention adopts independent research with communicate by letter, control and report to the police in nonpolarity two bus modes of digitizing of one, do not improving under the prerequisite of baud rate, even if realized, in same polling period, reach up to a hundred sensing points and upload fire alarm information, also can realize within 2.1 second time and quoting 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 circuit units, 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 bus high level lines, and the field apparatus in two buses sends address pulse signal, and working power is provided;
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 bus high level lines, and the field apparatus in two buses sends command pulse signal;
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 low level line with two bus high level lines; described low side sample circuit is connected with the low level line of described two buses, and described high-side current mapping circuit is connected with amplifying circuit after adopting circuit to be connected with described low side;
Analog to digital converter, is connected respectively with central control unit with described time code current circuit, and the signal of described time decoding circuit circuit is carried out inputting central control unit after analog to digital conversion;
Field apparatus: be connected with low level line with the high level line of two buses, receive the signal in two buses.
Also comprise pulse shaping circuit, be connected with pulse modulated circuit with described on-off circuit, will after described command pulse signal and address pulse signal shaping, export to field apparatus.
Also comprise short-circuit detecting circuit, be connected respectively with described analog to digital converter with described two bus high level lines, detect the electric signal of described two buses and input described analog to digital converter.
In described short-circuit detecting circuit, be provided with short circuit indicating device, when being short-circuited state, indicate.
The fire alarm control unit circuit units control method of fire alarm control unit circuit units, comprises the following steps:
(1) the unique address code of each field device configurations first connecting to circuit units;
(2) by central control unit, to two buses, send synchronization pulse, the signal returning by two buses records the background current size in two buses;
(3) central control unit OPADD pulse signal, described address rushes signal after negater circuit second, by described on-off circuit, to the field apparatus in two buses, sends address pulse signal;
(4) field apparatus receive described synchronization pulse carry out synchronous after, receive after the described address pulse signal identical with own address code, by time code current circuit return path signal in two buses, described return path signal is sent into central control unit and is processed after analog to digital converter converts digital signal to, draws the duty of field apparatus;
(5) when described central control unit is judged field apparatus and is sent warning message, described central control unit output command pulse signal, after oppositely, by pulse modulated circuit, send command pulse signal to the field apparatus in two buses of correspondence, after corresponding field apparatus of reporting to the police receives this command pulse signal, start actuation of an alarm.
In described step (3), the field apparatus transmission address pulse signal in two buses also comprises the step of carrying out shaping pulse by pulse shaping circuit before.
In described step (5), send command pulse signal to also comprising the step of carrying out shaping pulse by pulse shaping circuit before the field apparatus in two buses of correspondence.
In whole process, also comprise that short-circuit detecting circuit detects the whether step of short circuit of two buses.
When detecting two bus short circuits, described short-circuit detecting circuit indicates by short circuit indicating device.
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 be 24V pulsewidth be 4ms be address/confession electric pulse, wherein voltage be 10V pulsewidth be 4ms be 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, while 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, the second input end of described the first NAND gate circuit U2A is connected with its first input end, it is described on-off circuit input end that the output terminal of described the first Sheffer stroke gate U2A is connected to resistance R 5 one end, the other end of described resistance R 5 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 R 4, the collector of described power switch pipe T1 is connected with two bus high level line L+, the emitter of described power switch pipe T1 is connected with its base stage by resistance R 3, 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, the second input end of described the second Sheffer stroke gate U3A is connected with its first input end, described the second output terminal of Sheffer stroke gate U3A and the input end of described pulse modulated circuit are that one end of resistance R 10 is connected, the other end of described resistance R 10 is connected to the base stage of triode T5, the collector of described triode T5 is connected to external 24V power supply by resistance R 11, 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, after one end parallel connection of one end of resistance R 12 and capacitor C 2, be connected with the emitter of triode T5, the collector of described triode T6, after the other end parallel connection of the other end of resistance R 12 and capacitor C 2, be connected to the adjustment end of three-terminal voltage-stabilizing pipe T11, resistance R 13 is connected to the output terminal of three terminal regulator T11 and adjusts between end, the output terminal of described three terminal regulator T11 is also by the resistance R 15 of connecting successively, 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 buses.
High-side current mapping circuit described in described time code current circuit is connected with two 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 buses, the emitter of described triode T7 is connected between resistance R 15 and the output terminal of three-terminal voltage-stabilizing pipe T11 by resistance R 14, 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 R 15 and R16, the plus earth of described operational amplifier, its negative pole connects external 24V power supply, the positive input that the low level line L-of described two buses is also operational amplifier U4B with the input end of amplifying circuit is connected, described low side sample circuit is sampling resistor R19, after the anode of one end of described sampling resistor R19 and electric capacity D2 is in parallel, be connected to the positive input of described operational amplifier U4B, after the negative electrode of the other end of sampling resistor R19 and electric capacity D2 is in parallel, by resistance R 18, be connected to the input end anyway of described operational amplifier U4B, the point ground connection in parallel of described resistance R 18 and R19, resistance R 17 is connected to the output terminal of operational amplifier U4B 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.
The output terminal of described the second Sheffer stroke gate U3A is one end of contact resistance R7 also, the output terminal of described the first NAND gate circuit U2A is one end of contact resistance R6 also, after the other end parallel connection of described resistance R 7 and R6, be connected with the input end of described pulse shaping circuit, the input end of described pulse shaping circuit is the base stage of triode T4, the parallel connection point of the emitter of described triode T4 and the emitter of triode T3 is connected and ground connection with the emitter of triode T2, after the base stage of the collector of described triode T4 and triode T3 is in parallel, by resistance R 8, be connected to two bus high level line L+, the collector of described triode T3 is connected to two bus high level line L+ by resistance R 9.
The input end that the IN1 input end of described analog to digital converter U1 is connected to described short-circuit detecting circuit is one end of resistance R 1, the other end of described resistance R 1 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 R 1, the anodic bonding of described luminotron L1 is to the high level line L+ of two buses, one end ground connection after resistance R 2 is in parallel with capacitor C 1, 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 control unit circuit units of the present invention and control method thereof possess function of supplying power simultaneously, simplify communication line, again can real-time detecting system equipment working state; Bus bit efficiency, signal amplitude are high and low resistive, have the features such as long transmission distance, reliability are high, failure rate is low, and transmission range can reach 1500 meters farthest.
(2) fire alarm control unit circuit units of the present invention and control method thereof, also comprise pulse shaping circuit, be connected with pulse modulated circuit with described on-off circuit, to after described command pulse signal and address pulse signal shaping, export to field apparatus, described pulse shaping circuit can be avoided the impact of capacitive load on two bus-structured circuit, thereby improves the anti-interference of data communication.
(3) fire alarm control unit circuit units of the present invention and control method thereof, comprise short-circuit detecting circuit, in described short-circuit detecting circuit, be provided with short circuit indicating device, when being short-circuited state, indicate, can react timely failure problems, so that quick solution circuit question, avoids not safeguarding and failing to report fire condition in time because of fault.
(4) fire alarm control unit circuit units of the present invention and control method thereof, the power supply that adopts independent research with communicate by letter, control and report to the police in nonpolarity two bus modes of digitizing of one, do not improving under the prerequisite of baud rate, even if realized, in same polling period, reach up to a hundred sensing points and upload fire alarm information, also can realize within 2 second time and quoting simultaneously, the greatly high response time of fire alarm.
(5) fire alarm control unit circuit units 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 be 24V pulsewidth be 4ms be address/confession electric pulse, wherein voltage be 10V pulsewidth be 4ms be 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, only have the address of a baud position to patrol and examine code, interference free performance is very high, patrol and examine per-word error probability extremely low.
Accompanying drawing explanation
For content of the present invention is 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 control unit circuit units of the present invention;
Fig. 2 is the process flow diagram of fire alarm control unit circuit units control method of the present invention;
Fig. 3 is the circuit diagram of fire alarm control unit circuit units of the present invention;
Fig. 4 is the oscillogram of each pulse in fire alarm control unit circuit units of the present invention.
Embodiment
Some specific embodiments of fire alarm control unit circuit units of the present invention and control method thereof are provided below.
embodiment 1
Fire alarm control unit circuit units 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 bus high level lines, and the field apparatus in two buses sends address pulse signal, and working power is provided;
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 bus high level lines, and the field apparatus in two buses sends command pulse signal;
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 low level line with two bus high level lines; described low side sample circuit is connected with the low level line of described two buses, and described high-side current mapping circuit is connected with amplifying circuit after adopting circuit to be connected with described low side;
Analog to digital converter, is connected respectively with central control unit with described time code current circuit, and the signal of described time decoding circuit circuit is carried out inputting central control unit after analog to digital conversion;
Field apparatus: be connected with low level line with the high level line of two buses, receive the signal in two buses.
On the basis of fire alarm control unit circuit units described in embodiment 1, also comprise pulse shaping circuit, be connected with pulse modulated circuit with described on-off circuit, to after described command pulse signal and address pulse signal shaping, export to scene, described pulse shaping circuit can be avoided the impact of capacitive load on two bus-structured circuit, thereby improves the anti-interference of data communication.
embodiment 3
On the basis of the fire alarm control unit circuit units described in above embodiment, also comprise short-circuit detecting circuit, be connected respectively with described analog to digital converter with described two bus high level lines, detect the electric signal of described two buses and input described analog to digital converter.
In described short-circuit detecting circuit, be provided with short circuit indicating device, when being short-circuited state, indicate, can react timely failure problems, so that quick solution circuit question is avoided not safeguarding and failing to report fire condition in time because of fault.
embodiment 4
The control method of fire alarm control unit circuit units of the present invention as shown in Figure 2, comprises the following steps:
(1) the unique address code of each field device configurations first connecting to circuit units;
(2) by central control unit, to two buses, send synchronization pulse, the signal returning by two buses records the background current size in two buses;
(3) central control unit OPADD pulse signal, described address rushes signal after negater circuit second, by described on-off circuit, to the field apparatus in two buses, sends address pulse signal;
(4) field apparatus receive described synchronization pulse carry out synchronous after, receive after the described address pulse signal identical with own address code, by time code current circuit return path signal in two buses, described return path signal is sent into central control unit and is processed after analog to digital converter converts digital signal to, draws the duty of field apparatus;
(6) when described central control unit is judged field apparatus and is sent warning message, described central control unit output command pulse signal, after oppositely, by pulse modulated circuit, send command pulse signal to the field apparatus in two buses of correspondence, 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), the field apparatus transmission address pulse signal in two buses also comprises the step of carrying out shaping pulse by pulse shaping circuit before; In described step (6), send command pulse signal to also comprising the step of carrying out shaping pulse by pulse shaping circuit before the field apparatus in two buses of correspondence; In whole process, also comprise that short-circuit detecting circuit detects the whether step of short circuit of two buses; When detecting two bus short circuits, described short-circuit detecting circuit indicates by short circuit indicating device.
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 be 24V pulsewidth be 4ms be address/confession electric pulse, wherein voltage be 10V pulsewidth be 4ms be the time slot of instruction/reception, the addressing field apparatus that one-period is patrolled and examined in realization 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, only have the address of a baud position 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, when the background current that first records bus can be avoided next receiving addressing field apparatus and returns coded signal, avoid the working current of field apparatus, insulation leakagel volume leakage electric currents etc. are on detecting back the impact of code data signal, field apparatus receives after the address code identical with own address, the 8Bit bit data being preferably comprised of type and status code with the passback of digitizing current system respectively according to the order of sequence at bus DC10V pulse groove is on bus, 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 of described step (4) central control unit judgement field apparatus duty is described returning while being 20mA after code current subtracting background electric current preferably, and 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 control unit circuit units described in above embodiment, as shown in Figure 3, the address pulse signal output pin of central control unit J1 in described circuit units is connected with the first input end of the first NAND gate circuit U2A, describedly be connected with its first input end with the second input end of the first NAND gate circuit U2A, it is described on-off circuit input end that the output terminal of described the first Sheffer stroke gate U2A is connected to resistance R 5 one end, the other end of described resistance R 5 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 R 4, the collector of described power switch pipe T1 is connected with two bus high level line L+, the emitter of described power switch pipe T1 is connected with its base stage by resistance R 3, 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, the second input end of described the second Sheffer stroke gate U3A is connected with its first input end, described the second output terminal of Sheffer stroke gate U3A and the input end of described pulse modulated circuit are that one end of resistance R 10 is connected, the other end of described resistance R 10 is connected to the base stage of triode T5, the collector of described triode T5 is connected to external 24V power supply by resistance R 11, 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, after one end parallel connection of one end of resistance R 12 and capacitor C 2, be connected with the emitter of triode T5, the collector of described triode T6, after the other end parallel connection of the other end of resistance R 12 and capacitor C 2, be connected to the adjustment end of three-terminal voltage-stabilizing pipe T11, resistance R 13 is connected to the output terminal of three terminal regulator T11 and adjusts between end, the output terminal of described three terminal regulator T11 is also by the resistance R 15 of connecting successively, 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 buses.
High-side current mapping circuit described in described time code current circuit is connected with two 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 buses, the emitter of described triode T7 is connected between resistance R 15 and the output terminal of three-terminal voltage-stabilizing pipe T11 by resistance R 14, 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 R 15 and R16, the plus earth of described operational amplifier, its negative pole connects external 24V power supply, the positive input that the low level line L-of described two buses is also operational amplifier U4B with the input end of amplifying circuit is connected, described low side sample circuit is sampling resistor R19, after the anode of one end of described sampling resistor R19 and electric capacity D2 is in parallel, be connected to the positive input of described operational amplifier U4B, after the negative electrode of the other end of sampling resistor R19 and electric capacity D2 is in parallel, by resistance R 18, be connected to the input end anyway of described operational amplifier U4B, the point ground connection in parallel of described resistance R 18 and R19, resistance R 17 is connected to the output terminal of operational amplifier U4B 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 control unit circuit units described in above embodiment, the output terminal of described the second Sheffer stroke gate U3A is one end of contact resistance R7 also, the output terminal of described the first NAND gate circuit U2A is one end of contact resistance R6 also, after the other end parallel connection of described resistance R 7 and R6, be connected with the input end of described pulse shaping circuit, the input end of described pulse shaping circuit is the base stage of triode T4, the parallel connection point of the emitter of described triode T4 and the emitter of triode T3 is connected and ground connection with the emitter of triode T2, after the base stage of the collector of described triode T4 and triode T3 is in parallel, by resistance R 8, be connected to two bus high level line L+, the collector of described triode T3 is connected to two bus high level line L+ by resistance R 9, described pulse shaping circuit can be avoided the impact of capacitive load on two bus-structured circuit, thereby improve the anti-interference of data communication.
embodiment 8
On the basis of the fire alarm control unit circuit units described in above embodiment, also comprise short-circuit detecting circuit, the input end that the IN1 input end of described analog to digital converter U1 is connected to described short-circuit detecting circuit is one end of resistance R 1, the other end of described resistance R 1 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 R 1, the anodic bonding of described luminotron L1 is to the high level line L+ of two buses, one end ground connection after resistance R 2 is in parallel with capacitor C 1, the other end is connected to the IN1 input end of analog to digital converter U1.
Each circuit working principle of fire alarm control unit circuit units of the present invention is as follows:
The central control unit J1 of described circuit units send address pulse signal after reverse with the first not circuit U2 to P1 port, through the resistance R 3 of power switch pipe T1 and periphery, the on-off circuit that R4, R5 form, field apparatus on two bus high level line L+ sends address pulse signal, simultaneously for detector, module etc. provides working power.When P1 mouth signal is high level, by resistance R 5, make triode T2 conducting, thereby make power switch pipe T1 conducting, P1 mouth signal makes triode T4 conducting by resistance R 5 simultaneously, triode T3 cut-off, high level line L+ output 24V high level.When P1 mouth signal is low level, triode T2 cut-off, triode T3 conducting, thus power switch pipe T1 is also ended, high level line L+ output 0V low level.
Described central control unit J1 send command pulse signal after reverse with the second not circuit U3 to P0 port, after the pulse modulated circuit being formed by three-terminal voltage-stabilizing pipe T11, triode T5, T6 and peripheral resistance R 10, R11, R12, R13 and capacitor C 2, export 0-10V voltage, field apparatus in two buses sends command pulse signal, supplies back the work of code receiving test circuit simultaneously.Described three-terminal voltage-stabilizing pipe preferably adopts LM317, and filter capacitor C2 Main Function is to reduce the pulse voltage of output with radio-frequency component, suppresses self-sustained oscillation and reduces the ripple that external interference is brought.When P0 mouth signal is high level, by resistance R 10, make triode T5 conducting, triode T6 cut-off, thus make three-terminal voltage-stabilizing pipe T11 output 10.6V high level, high level line L+ output 10V high level; When P0 mouth signal is low level, triode T5 cut-off, triode T6 conducting, thus make three-terminal voltage-stabilizing pipe T11 output 1.2V low level, high level line L+ output 0V low level.After the pulse shaping circuit that high level line L+ output forms through resistance R 6, R7, R8, the R9 of triode T3, T4 and periphery again, send into detector detector, module etc., shaping circuit can be avoided the impact of capacitive load on bus-structured circuit.
The code reception signal that returns of described circuit units is by returning code current circuit, comprising what high-side current mapping circuit, low side sample circuit and amplifying circuit were realized, return code current one tunnel two bus low level line end L-, after sampling sampling resistor R19, form pulse voltage, another road is through resistance R 15 samplings, operational amplifier U4A and triode T7, the high level line end electric current mapping circuit that resistance R 14 forms, be added on sampling sampling resistor R19 with the electric current of low level line end L-, current signal transfers voltage signal to, again through operational amplifier U4B and resistance R 17, the amplifying circuit that R18 forms amplifies output S0 by signal, S0 sends into central control unit J1 and processes after analog to digital converter U1 conversion, the background current value that central control unit J1 adopted the different periods, marking current value, magnitude of voltage carries out fuzzy intelligence Algorithm Analysis processing, draw accurately the various running state information of field apparatus.
Described short-circuit detecting circuit is comprised of resistance R 1, R2 and capacitor C 1, in bus during circuit normal operation, L+ upper pulse voltage in loop is lighted luminotron L1, indication normal operating condition, again through resistance R 1, R2 dividing potential drop, after capacitor C 1 filtering, output 2.5V pulse, enters analog to digital conversion circuit U1 from S1 port and converts to and send into central control unit J1 digital signal and carry out analyzing and processing.When bus short circuit, L+ upper pulse voltage in loop is through diode D2 ground connection, thereby make power switch pipe T1 cut-off, output low level line, luminotron L1 is extinguished, indication short trouble state, the S1 Port detecting of analog to digital conversion circuit U1 is to 0V voltage, converts to send into central control unit J1 after digital signal and carry out analyzing and processing.
Obviously above-described embodiment is only for example is clearly described, and the not restriction 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 also giving all embodiments.And the apparent variation of being extended out thus or change are still among the protection domain in the invention.
Claims (10)
1. a fire alarm control unit circuit units, 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 bus high level lines, and the address pulse signal that receives described central control unit sends to the field apparatus in two buses, and working power is provided;
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 bus high level lines, and the command pulse signal that receives described central control unit sends to the field apparatus in two buses;
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 low level line with two bus high level lines; described low side sample circuit is connected with the low level line of described two buses, and described high-side current mapping circuit is connected with amplifying circuit after adopting circuit to be connected with described low side;
Analog to digital converter, is connected respectively with central control unit with described time code current circuit, and the signal of described time code current circuit is carried out inputting central control unit after analog to digital conversion;
Field apparatus: be connected with low level line with the high level line of two buses, receive the signal in two buses.
2. fire alarm control unit circuit units according to claim 1, it is characterized in that, also comprise pulse shaping circuit, be connected with pulse modulated circuit with described on-off circuit, will after described command pulse signal and address pulse signal shaping, export to field apparatus;
Fire alarm control unit circuit units according to claim 1 and 2, it is characterized in that: also comprise short-circuit detecting circuit, be connected respectively with described analog to digital converter with described two bus high level lines, detect the electric signal of described two buses and input described analog to digital converter;
Fire alarm control unit circuit units according to described in claim 1-3 any one, is characterized in that, is provided with short circuit indicating device in described short-circuit detecting circuit, when being short-circuited state, indicates.
3. according to the fire alarm control unit circuit units described in claim 1-4 any one, it is characterized in that, 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, the second input end of described the first NAND gate circuit U2A is connected with its first input end, it is described on-off circuit input end that the output terminal of described the first Sheffer stroke gate U2A is connected to resistance R 5 one end, the other end of described resistance R 5 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 R 4, the collector of described power switch pipe T1 is connected with two bus high level line L+, the emitter of described power switch pipe T1 is connected with its base stage by resistance R 3, the emitter of described power switch pipe T1 is also connected with external 24V power supply.
4. according to the fire alarm control unit circuit units described in claim 1-5 any one, 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, the second input end of described the second Sheffer stroke gate U3A is connected with its first input end, described the second output terminal of Sheffer stroke gate U3A and the input end of described pulse modulated circuit are that one end of resistance R 10 is connected, the other end of described resistance R 10 is connected to the base stage of triode T5, the collector of described triode T5 is connected to external 24V power supply by resistance R 11, 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, after one end parallel connection of one end of resistance R 12 and capacitor C 2, be connected with the emitter of triode T5, the collector of described triode T6, after the other end parallel connection of the other end of resistance R 12 and capacitor C 2, be connected to the adjustment end of three-terminal voltage-stabilizing pipe T11, resistance R 13 is connected to the output terminal of three terminal regulator T11 and adjusts between end, the output terminal of described three terminal regulator T11 is also by the resistance R 15 of connecting successively, 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 buses.
5. according to the fire alarm control unit circuit units described in claim 1-6 any one, it is characterized in that, high-side current mapping circuit described in described time code current circuit is connected with two 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 buses, the emitter of described triode T7 is connected between resistance R 15 and the output terminal of three-terminal voltage-stabilizing pipe T11 by resistance R 14, 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 R 15 and R16, the plus earth of described operational amplifier, its negative pole connects external 24V power supply, the positive input that the low level line L-of described two buses is also operational amplifier U4B with the input end of amplifying circuit is connected, described low side sample circuit is sampling resistor R19, after the anode of one end of described sampling resistor R19 and electric capacity D2 is in parallel, be connected to the positive input of described operational amplifier U4B, after the negative electrode of the other end of sampling resistor R19 and electric capacity D2 is in parallel, by resistance R 18, be connected to the input end anyway of described operational amplifier U4B, the point ground connection in parallel of described resistance R 18 and R19, resistance R 17 is connected to the output terminal of operational amplifier U4B 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,
According to the fire alarm control unit circuit units described in claim 1-7 any one, it is characterized in that, the output terminal of described the second Sheffer stroke gate U3A is one end of contact resistance R7 also, the output terminal of described the first NAND gate circuit U2A is one end of contact resistance R6 also, after the other end parallel connection of described resistance R 7 and R6, be connected with the input end of described pulse shaping circuit, the input end of described pulse shaping circuit is the base stage of triode T4, the parallel connection point of the emitter of described triode T4 and the emitter of triode T3 is connected and ground connection with the emitter of triode T2, after the base stage of the collector of described triode T4 and triode T3 is in parallel, by resistance R 8, be connected to two bus high level line L+, the collector of described triode T3 is connected to two bus high level line L+ by resistance R 9,
According to the fire alarm control unit circuit units described in claim 1-8 any one, it is characterized in that, the input end that the IN1 input end of described analog to digital converter U1 is connected to described short-circuit detecting circuit is one end of resistance R 1, the other end of described resistance R 1 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 R 1, the anodic bonding of described luminotron L1 is to the high level line L+ of two buses, one end ground connection after resistance R 2 is in parallel with capacitor C 1, the other end is connected to the IN1 input end of analog to digital converter U1.
6. a control method for the fire alarm control unit circuit units based on described in claim 1-9 any one, is characterized in that, comprises the following steps:
(1) the unique address code of each field device configurations first connecting to circuit units;
(2) by central control unit, to two buses, send synchronization pulse, the signal returning by two buses records the background current size in two buses;
(3) central control unit OPADD pulse signal, described address rushes signal after negater circuit second, by described on-off circuit, to the field apparatus in two buses, sends address pulse signal;
(4) field apparatus receive described synchronization pulse carry out synchronous after, receive after the described address pulse signal identical with own address code, by time code current circuit return path signal in two buses, described return path signal is sent into central control unit and is processed after analog to digital converter converts digital signal to, draws the duty of field apparatus;
(5) when described central control unit is judged field apparatus and is sent warning message, described central control unit output command pulse signal, after oppositely, by pulse modulated circuit, send command pulse signal to the field apparatus in two buses of correspondence, after corresponding field apparatus of reporting to the police receives this command pulse signal, start actuation of an alarm.
7. fire alarm control unit circuit units control method according to claim 10, it is characterized in that: in described step (3), the field apparatus transmission address pulse signal in two buses also comprises the step of carrying out shaping pulse by pulse shaping circuit before;
According to the fire alarm control unit circuit units control method described in claim 10 or 11, it is characterized in that: in described step (5), send command pulse signal to also comprising the step of carrying out shaping pulse by pulse shaping circuit before the field apparatus in two buses of correspondence.
8. according to the fire alarm control unit circuit units control method described in claim 10-12 any one, it is characterized in that: in whole process, also comprise that short-circuit detecting circuit detects the whether step of short circuit of two buses;
Fire alarm control unit circuit units control method according to described in claim 10-13 any one, is characterized in that: when described short-circuit detecting circuit detects two bus short circuits, by short circuit indicating device, indicate.
9. according to the fire alarm control unit circuit units control method described in claim 10-14 any one, it is characterized in that, 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 be 24V pulsewidth be 4ms be address/confession electric pulse, wherein voltage be 10V pulsewidth be 4ms be the time slot of instruction/reception;
Fire alarm control unit circuit units control method according to described in claim 10-15 any one, is characterized in that, described time code current pulse comprises the categorical data of 4Bit position 2ms pulsewidth and the status data of 4Bit position 2ms pulsewidth.
10. according to the fire alarm control unit circuit units control method described in claim 10-16 any one, it is characterized in that, the disposal route of described step (4) central control unit is, while being 20mA after described time code current subtracting background electric current, described central control unit is judged to be " 1 ", during for 6mA, described central control unit is judged to be " 0 ".
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