Fire control system

Abstract

The utility model discloses a fire-fighting control system which comprises a controller, a converter and a plurality of detectors, the plurality of detectors are all connected with an input interface of the converter, and an output interface of the converter is connected with the controller through two buses; the converter comprises a conversion chip, a digital isolation chip and a single chip microcomputer which are connected in sequence, and the conversion chip is used for converting a differential signal obtained from the detector into a level signal; the digital isolation chip is used for isolating the level signal and then outputting an isolation signal, and the single-chip microcomputer is used for identifying the isolation signal and transmitting the identified data to the two buses. According to the process, the defects of a traditional system in the aspect of information uploading are effectively overcome, and the intelligent level and the automation level of a fire fighting system are improved. According to the fire-fighting control system, the detection capability of a fire-fighting system is greatly enriched, various environmental parameters are monitored, and the fire-fighting safety guarantee is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fire control especially relates to a fire control system. BACKGROUND

[0002] Two bus is a kind of relative to four-wire system (two power supply lines, two communication lines), power line and signal line are combined two into one, signal and power sharing one bus technology is realized.Two bus saves construction and cable cost, brings great convenience to field construction and later maintenance.It is widely used in fire control, instrument, sensor, industrial control and other fields.

[0003] With the increasing demand of fire control industry for external sensor, the demand of converting industrial sensor protocol into fire control two bus protocol is more and more urgent.The converter connected with two bus in prior art usually only supports single address, carries out one-to-one protocol escape, limits the flexibility and expansibility of fire control system. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the present application provides a fire control system, comprising:

[0005] Controller, converter and multiple detectors, wherein the multiple detectors are connected with the input interface of the converter, and the output interface of the converter is connected with the controller through two bus;

[0006] The converter comprises conversion chip, digital isolation chip and single-chip microcomputer connected in sequence, wherein the conversion chip is used to convert the differential signal obtained from the detector into level signal;The digital isolation chip is used to isolate and output isolation signal after the level signal, and the single-chip microcomputer is used to identify the isolation signal and transmit the identified data to two bus.

[0007] Preferably, the converter is provided with multiple, and the input interface of each converter is connected with multiple detectors;Multiple converters are connected with the controller through two bus.

[0008] Preferably, the input interface of the converter adopts 485 bus interface or CAN bus interface, or the input interface of the converter adopts 485 bus interface and CAN bus interface.

[0009] Preferably, the input interface of the converter allows up to 128 addresses of the detector to be connected.

[0010] Preferably, when the input interface of the converter adopts a 485 bus interface, the conversion chip is a 485 conversion chip; the 485 conversion chip is used to convert the differential signals 485A1 and 485B1 of 485 communication into level signals RO and DI; the digital isolation chip is used to isolate and output the isolated signals 485_RX1 and 485_TX1 after isolating the level signals RO and DI, and the isolated signals 485_RX1 and 485_TX1 are input to the single-chip microcomputer and then sent to the two buses after the recognized data are received and sent by the DECODE and FEEDBACK pins of the single-chip microcomputer.

[0011] Preferably, the digital isolation chip is also used to convert the 5V level signals RO and DI into the 3.3V isolated signals 485_RX1 and 485_TX1 that can be recognized by the single-chip microcomputer.

[0012] Preferably, at least one of the first short-circuit protection circuit, the first communication quality guarantee circuit and the first anti-interference circuit is included between the 485A1 and 485B1 signal input pins and the 485 conversion chip.

[0013] Preferably, when the input interface of the converter adopts a CAN bus interface, the conversion chip is a CAN conversion chip; the CAN conversion chip is used to convert the differential signals CANH and CANL of CAN communication into level signals TXD and RXD; the digital isolation chip is used to isolate and output the isolated signals CAN_TX and CAN_RX after isolating the level signals TXD and RXD, and the isolated signals CAN_TX and CAN_RX are input to the single-chip microcomputer and then sent to the two buses after the recognized data are received and sent by the DECODE and FEEDBACK pins of the single-chip microcomputer.

[0014] Preferably, the digital isolation chip is also used to convert the 5V level signals TXD and RXD into the 3.3V isolated signals CAN_TX and CAN_RX that can be recognized by the single-chip microcomputer.

[0015] Preferably, at least one of the second short-circuit protection circuit, the second communication quality guarantee circuit and the second anti-interference circuit is included between the CANH and CANL signal input pins and the CAN conversion chip.

[0016] The fire control system has the following beneficial effects: the input interface of the converter can be connected with multiple detectors, so that the multiple detectors can be integrated and managed through the same converter, that is, multiple address configurations are supported, the types of connectable detectors are expanded, the utilization rate of the equipment is significantly improved, and the flexibility and compatibility of the system are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the present application will be further described below with reference to the drawings and embodiments. The drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the premise of the drawings:

[0018] Figure 1 is a structural schematic view of a first embodiment of a fire control system of a preferred embodiment of the present application;

[0019] Figure 2 is a structural schematic view of a second embodiment of a fire control system of a preferred embodiment of the present application;

[0020] Figure 3 is a circuit schematic view of a 485 conversion chip and a first digital isolation chip of a converter of a preferred embodiment of the present application;

[0021] Figure 4 is a circuit schematic view of a single-chip microcomputer of a converter of a preferred embodiment of the present application;

[0022] Figure 5 is a circuit schematic view of a CAN conversion chip of a converter of a preferred embodiment of the present application;

[0023] Figure 6 is a circuit schematic view of a second digital isolation chip of a converter of a preferred embodiment of the present application. DETAILED DESCRIPTION

[0024] To make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0025] Please refer to Figure 1 , Figure 1 The structural schematic diagram of a first embodiment of a fire control system provided by the present application comprises a controller 1, a converter 2, and a plurality of detectors 3, wherein the plurality of detectors 3 are connected with input interfaces of the converter 2, and output interfaces of the converter 2 are connected with the controller 1 through a bus 2; the converter 2 comprises a conversion chip, a digital isolation chip, and a single-chip microcomputer connected in sequence, wherein the conversion chip is used for converting differential signals obtained from the detectors 3 into level signals; the digital isolation chip is used for outputting isolation signals after isolating the level signals; and the single-chip microcomputer is used for identifying the isolation signals and transmitting the identified data onto the bus 2.

[0026] The detectors 3 can be temperature detectors, smoke concentration detectors, detectors for detecting various gas concentrations, etc., and the role thereof is to transmit various environmental data detected by the detectors 3 to the controller 1 through the converter 2. The converter 2 processes the data uploaded by the detectors 3 and uploads these data to the controller 1 through the bus 2. The controller 1 processes various data detected by the detectors 3 and processed by the converter 2, and can control peripheral devices according to these data.

[0027] The fire control system of the present application can connect the input interfaces of the converter 2 with the plurality of detectors 3, so that the plurality of detectors 3 can be integrated and managed through the same converter 2, that is, support multi-address configuration, not only expand the types of connectable detectors 3, but also significantly improve the utilization rate of the device, improve the flexibility and compatibility of the system. At the same time, the need for multiple converters is reduced, effectively reducing the cost of device connection. This not only optimizes the networking structure of the system, but also reduces the complexity of installation and maintenance, further improving the overall economy and operability. Through the conversion chip, the digital isolation chip, and the single-chip microcomputer, various data collected by the detectors 3 are converted, isolated, and identified, and the identified data are transmitted onto the bus 2 and then uploaded to the fire control host. This process effectively solves the deficiencies of the traditional system in information uploading, and improves the intelligent and automated level of the fire control system. The fire control system of the present application will greatly enrich the detection capability of the fire control system, realize the monitoring of various environmental parameters, and enhance the fire safety guarantee.

[0028] Please refer to Figure 2 ,Figure 2 A structure diagram of a second embodiment of a fire control system provided by the present application is shown in the figure. In the fire control system, multiple converters 2 are provided, and each converter 2 is connected with multiple detectors 3 through an input interface. The multiple converters 2 are connected with a controller 1 through two buses.

[0029] With the increasing demand for external sensors in the fire industry, the demand for converting industrial detector protocols into fire two-bus protocols is becoming more and more urgent. The fire control system provided by the present embodiment meets this demand, supports multi-address configuration, and can more efficiently connect multiple different types of industrial detectors to the fire control system to achieve comprehensive collection of system information. The fire control system provided by the present embodiment not only expands the types of connectable detectors, but also improves the flexibility and compatibility of the system.

[0030] In one of the embodiments, the input interface of the converter adopts a 485 bus interface or a CAN bus interface, or the input interface of the converter adopts a 485 bus interface and a CAN bus interface. That is, each converter can use 485 communication or CAN communication alone, or each converter can have both 485 communication and CAN communication.

[0031] In one of the embodiments, the input interface of the converter 2 allows connection of up to 128 address detectors 3. This design not only expands the types of connectable detectors, but also improves the flexibility and compatibility of the system. Through the 485 bus interface and the CAN bus interface, various data collected by the industrial detector can be converted into a two-bus protocol and then uploaded to the fire control host. This process effectively solves the shortcomings of traditional systems in information uploading and improves the intelligent and automated level of the fire control system. The implementation of the present application will greatly enrich the detection capability of the fire control system, realize the monitoring of various environmental parameters, and enhance the fire safety guarantee.

[0032] In one of the embodiments, the above-mentioned converter includes a 485 conversion chip, a first digital isolation chip (the above-mentioned digital isolation chip includes a first digital isolation chip), and a single-chip microcomputer connected in sequence. Please refer to Figure 3 and Figure 4 , Figure 3 The circuit schematic diagram of the 485 conversion chip and the first digital isolation chip of the converter of the preferred embodiment provided by the present application is shown in the figure. Figure 4The schematic diagram of the single-chip microcomputer of the converter of the preferred embodiment provided in the present application; wherein the 485 conversion chip U5 is used to convert the differential signals 485A1 and 485B1 of the 485 communication into level signals RO and DI; the RO and DI pins of the RS485 communication are connected to the VICA and VOA pins of the first digital isolation chip U4 respectively, the first digital isolation chip is used to isolate and output the isolated signals 485_RX1 and 485_TX1 after isolating the level signals RO and DI, the isolated signals 485_RX1 and 485_TX1 are input to the single-chip microcomputer U11, the single-chip microcomputer U11 receives the data detected by the detector 3 and transmits the corresponding data to the two buses from the DECODE and FEEDBACK pins. Due to the action of the first digital isolation chip U4, the RO / DI and 485_RX1 / 485_TX1 are separated into two parties, even if a strong interference signal comes from one party, the influence of the transmission to the other party is greatly attenuated, and the communication of the other party is basically not affected. Figure 4

[0033] In addition to anti-interference, the first digital isolation chip U4 is also used to convert the 5V level signals RO and DI of the 485 communication into 3.3V 485_RX1 and 485_TX1 signals that can be recognized by the single-chip microcomputer U11.

[0034] In one of the embodiments, at least one of the first short-circuit protection circuit 6, the first communication quality guarantee circuit 71 and 72, and the first anti-interference circuit 8 is included between the 485A1 and 485B1 signal input pins and the 485 conversion chip.

[0035] In one of the embodiments, the first short-circuit protection circuit 6 includes the fuse F1 and F2, which functions as short-circuit protection and is connected in series between the 485A1 and 485B1 signal input pins and the first communication quality guarantee circuit 71.

[0036] In one of the embodiments, the first communication quality guarantee circuit 71 includes the matching resistor R44, which can better guarantee the communication quality and is connected in parallel between the first short-circuit protection circuit 6 and the first anti-interference circuit 8.

[0037] ​In one of the embodiments, the first anti-interference circuit 8 includes the capacitor C26, the capacitor C28, the transient voltage suppression diode TVS1, the transient voltage suppression diode TVS2, the transient voltage suppression diode TVS3, and the inductor L3, which play the role of anti-interference. The 3-pin and 4-pin of the inductor L3 are connected with the first communication quality guarantee circuit 71, and the 1-pin and 2-pin of the inductor L3 are connected with the B-pin and A-pin of the 485 conversion chip U5 respectively. One end of the capacitor C26 is connected with the B-pin of the 485 conversion chip U5, and the other end is grounded. One end of the capacitor C28 is connected with the A-pin of the 485 conversion chip U5, and the other end is grounded. One end of the transient voltage suppression diode TVS1 is connected with the B-pin of the 485 conversion chip U5, and the other end is grounded. One end of the transient voltage suppression diode TVS2 is connected with the B-pin of the 485 conversion chip U5, and the other end is connected with the A-pin of the 485 conversion chip U5. One end of the transient voltage suppression diode TVS3 is connected with the A-pin of the 485 conversion chip U5, and the other end is grounded.

[0038] In one of the embodiments, the first anti-interference circuit 8 can not include the capacitor C26 and the capacitor C28, and the anti-interference role can also be achieved.

[0039] In one of the embodiments, the first communication quality guarantee circuit 72 includes the pull-down resistor R16 and the pull-up resistor R21, which can better guarantee the communication quality. One end of the pull-down resistor R16 is connected with the B-pin of the 485 conversion chip U5, and the other end is grounded. One end of the pull-up resistor R21 is connected with the A-pin of the 485 conversion chip U5, and the other end is grounded.

[0040] Please refer to Figure 5 and Figure 6 , Figure 5 the circuit schematic diagram of the CAN conversion chip of the converter of the preferred embodiment provided in the present application; Figure 6 is the circuit schematic diagram of the second digital isolation chip of the converter of the preferred embodiment of the present application. In one of the embodiments, the converter 2 includes the CAN conversion chip U10, the second digital isolation chip U1 (the digital isolation chip includes the second digital isolation chip U1), and the single-chip microcomputer U11 connected in sequence. The CAN conversion chip U10 is used to convert the differential signals CANH and CANL of the CAN communication into the level signals TXD and RXD. The TXD pin and the RXD pin of the CAN communication are connected with the VOB pin and the VIA pin of the digital isolation chip U1 respectively. The second digital isolation chip U1 is used to isolate and output the isolation signals CAN_TX and CAN_RX after the level signals TXD and RXD are isolated. The isolation signals CAN_TX and CAN_RX are input to the single-chip microcomputer U11. Figure 4The single-chip U11 is shown (it should be noted that when the converter has both 485 bus interface and CAN bus interface, the single-chip for CAN communication can be the same as that for 485 communication; when the converter has only 485 bus interface or CAN bus interface, the single-chip for CAN communication can be the same as that for 485 communication or the same type but not the same single-chip; of course, in other embodiments, different types of single-chips can also be used, as long as the single-chip can realize the identification function), after the single-chip U11 identifies the data detected by the detector, the corresponding data is transmitted from the DECODE and FEEDBACK pins of the single-chip U11 to the two buses, realizing the communication between the serial port and the two buses. Due to the isolation effect of the second digital isolation chip U1, TXD / RXD and CAN_TX / CAN_RX are separated into two parts, even if a strong interference signal comes from one part, the influence on the other end is greatly attenuated, and the communication of the other end is basically not affected.

[0041] In addition to anti-interference, the above-mentioned second digital isolation chip U1 is also used to convert the 5V level signal TXD and RXD of CAN communication into the 3.3V CAN_TX and CAN_RX signals that can be recognized by the single-chip U11.

[0042] In one of the embodiments, at least one of the second short-circuit protection circuit 9, the second communication quality guarantee circuit 10, and the second anti-interference circuit 11 is included between the CANH and CANL signal input pins and the CAN conversion chip.

[0043] In one of the embodiments, the second short-circuit protection circuit 9 includes the fuse F5 and F6, which plays a short-circuit protection role and is connected in series between the CANH and CANL signal input pins and the second communication quality guarantee circuit 10.

[0044] In one of the embodiments, the second communication quality guarantee circuit 10 includes the matching resistor R45, which can better guarantee the communication quality and is connected in parallel between the second short-circuit protection circuit 9 and the second anti-interference circuit 11.

[0045] In one of the embodiments, the second anti-interference circuit 11 includes the capacitor C54, the capacitor C55, the transient voltage suppression diode TVS5, the transient voltage suppression diode TVS6, the transient voltage suppression diode TVS8, the inductor L2, the filter LB3, and the filter LB4, which play the role of anti-interference. The 3-pin and 4-pin of the inductor L2 are connected with the second communication quality assurance circuit 10, the 1-pin and 2-pin of the inductor L2 are connected with the CANH pin and the CANL pin of the CAN conversion chip U10 via the filter LB3 and the filter LB4 respectively. One end of the capacitor C54 is connected with the CANL pin of the CAN conversion chip U10, and the other end is grounded. One end of the capacitor C56 is connected with the CANH pin of the CAN conversion chip U10, and the other end is grounded. One end of the transient voltage suppression diode TVS5 is connected with the CANH pin of the CAN conversion chip U10 via the filter LB3, and the other end is grounded. One end of the transient voltage suppression diode TVS6 is connected with the CANH pin of the CAN conversion chip U10 via the filter LB3, and the other end is connected with the CANL pin of the CAN conversion chip U10 via the filter LB4. One end of the transient voltage suppression diode TVS8 is connected with the CANL pin of the CAN conversion chip U10 via the filter LB4, and the other end is grounded.

[0046] In one of the embodiments, the second anti-interference circuit 11 can not include the capacitor C54, the capacitor C55, the filter LB3, and the filter LB4, and still play the role of anti-interference.

[0047] It should be noted that in the present specification, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles, or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or further include elements inherent in such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article, or device including the element.

[0048] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fire control system, characterized in that The application relates to a controller, a converter and a plurality of detectors, wherein the plurality of detectors are connected with input interfaces of the converter, and output interfaces of the converter are connected with the controller through a two-wire bus. The converter comprises a conversion chip, a digital isolation chip and a single-chip microcomputer connected in sequence, wherein the conversion chip is used for converting differential signals obtained from the detectors into level signals; the digital isolation chip is used for isolating and outputting isolation signals after the level signals are isolated; and the single-chip microcomputer is used for identifying the isolation signals and transmitting the identified data onto the two-wire bus. The converter is provided with a plurality of input interfaces, and each of the input interfaces is connected with a plurality of detectors; and the plurality of converters are connected with the controller through the two-wire bus.

2. The fire control system of claim 1, wherein, The input interface of the converter adopts a 485 bus interface or a CAN bus interface, or the input interface of the converter adopts the 485 bus interface and the CAN bus interface.

3. The fire control system of claim 2, wherein, The input interface of the converter allows a maximum of 128 addresses of the detectors to be connected.

4. The fire control system of claim 3, wherein, When the input interface of the converter adopts the 485 bus interface, the conversion chip is a 485 conversion chip; the 485 conversion chip is used for converting differential signals 485A1 and 485B1 of 485 communication into level signals RO and DI; the digital isolation chip is used for isolating and outputting isolation signals 485_RX1 and 485_TX1 after the level signals RO and DI are isolated; and the isolation signals 485_RX1 and 485_TX1 are input into the single-chip microcomputer, and the identified data is transmitted onto the two-wire bus through the DECODE and FEEDBACK pins of the single-chip microcomputer.

5. The fire control system of claim 3, wherein, The digital isolation chip is also used for converting the 5V level signals RO and DI into 3.3V isolation signals 485_RX1 and 485_TX1 that can be identified by the single-chip microcomputer.

6. The fire control system of claim 5, wherein, At least one of a first short-circuit protection circuit, a first communication quality guarantee circuit and a first anti-interference circuit is arranged between the 485A1 and 485B1 signal input pins and the 485 conversion chip.

7. The fire control system of claim 5, wherein, When the input interface of the converter adopts the CAN bus interface, the conversion chip is a CAN conversion chip; the CAN conversion chip is used for converting differential signals CANH and CANL of CAN communication into level signals TXD and RXD; the digital isolation chip is used for isolating and outputting isolation signals CAN_TX and CAN_RX after the level signals TXD and RXD are isolated; and the isolation signals CAN_TX and CAN_RX are input into the single-chip microcomputer, and the identified data is transmitted onto the two-wire bus through the DECODE and FEEDBACK pins of the single-chip microcomputer.

8. The fire control system of claim 3, wherein, The digital isolation chip is also used for converting the 5V level signals TXD and RXD into 3.3V isolation signals CAN_TX and CAN_RX that can be identified by the single-chip microcomputer.

9. The fire control system of claim 8, wherein, At least one of a second short-circuit protection circuit, a second communication quality guarantee circuit and a second anti-interference circuit is arranged between the CANH and CANL signal input pins and the CAN conversion chip.

10. The fire control system of claim 8, wherein, ​

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