CN212009797U - Fire alarm circuit of static is prevented in lightning protection - Google Patents
Fire alarm circuit of static is prevented in lightning protection Download PDFInfo
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- CN212009797U CN212009797U CN202020385610.9U CN202020385610U CN212009797U CN 212009797 U CN212009797 U CN 212009797U CN 202020385610 U CN202020385610 U CN 202020385610U CN 212009797 U CN212009797 U CN 212009797U
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Abstract
The application provides a lightning-protection and anti-static fire alarm circuit which comprises an MCU (microprogrammed control Unit) processor, a 485 communication module, a 485 pre-stage module, a GPRS (general packet radio service) communication module, an SIM (subscriber identity module), a temperature acquisition module, a program programming module and a power supply module; the 485 pre-stage module is used for limiting and protecting a circuit when the current of the 485 communication module is overlarge; the GPRS communication module is connected with the MCU processor and is configured for wireless communication; the SIM module is connected with a first electrostatic tube D4 for preventing electrostatic interference in the circuit; the program programming module is connected with a second electrostatic tube D5, and the second electrostatic tube D5 is used for preventing electrostatic interference in a circuit; the temperature acquisition module is used for acquiring temperature data, and is provided with a TVS tube D6 for clamping and protecting the loop voltage; the application provides a static fire alarm circuit is prevented in lightning protection has the lightning protection and prevents the static function, and is strong to external interference killing feature, can effectively ensure equipment normal operating.
Description
Technical Field
The present disclosure relates generally to fire alarm circuits, and more particularly to a fire alarm circuit with lightning and static electricity protection.
Background
And a circuit for reporting the state of the machine or a dangerous condition to an operator in a visual display or audible alarm manner. The electronic technology application in China is popularized in various fields, wherein the alarm circuit is widely applied.
However, in the prior art, the fire alarm circuit has low anti-interference capability to the external environment, is easily interfered by static electricity, and is easily damaged due to sudden voltage change.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a lightning and static electricity protection fire alarm circuit with high interference rejection capability.
In order to solve the above problem, the utility model provides a fire alarm circuit of static is prevented in lightning protection, include: the device comprises an MCU processor, a 485 communication module, a 485 pre-stage module, a GPRS communication module, an SIM module, a temperature acquisition module, a program programming module and a power supply module;
the 485 communication module is connected with the MCU processor through a data interface P1 and is used for communicating with external equipment;
the 485 pre-stage module is connected with a 485A pin and a 485B pin of the 485 communication module, and the 485 pre-stage module is used for limiting and protecting a circuit when the current of the 485 communication module is overlarge;
the GPRS communication module is connected with the MCU processor through a data interface P2 and is configured for wireless communication;
the GPRS communication module is connected with the SIM1 module; a first electrostatic tube D4 is connected to the SIM module, and the first electrostatic tube D4 is used for preventing electrostatic interference in a circuit;
the program programming module is connected with the MCU processor and is used for programming programs to the MCU processor; the program programming module is connected with a second electrostatic tube D5, and the second electrostatic tube D5 is used for preventing electrostatic interference in a circuit;
the temperature acquisition module is connected with the input end of the MCU processor and used for acquiring temperature data; the temperature acquisition module is provided with a TVS tube D6 for clamping and protecting the loop voltage;
the power supply module supplies power to the system.
According to the technical scheme that this application embodiment provided, 485 preceding stage module includes: a first fuse F1, a second fuse F2, and a discharge tube D7;
a pin 1 of the discharge tube D7 is connected with one end of the first fuse tube F1, the other end of the first fuse tube F1 is connected with the pin 485A, and a pin 1 of the discharge tube D7 is also connected with an LB pin for communicating with external equipment; the pin 2 of the discharge tube D7 is connected with one end of the second fuse F2, the other end of the second fuse F2 is connected with the pin 485B, and the pin 2 of the discharge tube D7 is also connected with an HA pin for communication with external equipment; the 3-pin of the discharge tube D7 is grounded.
According to the technical scheme provided by the embodiment of the application, a pin 1 of the first electrostatic tube D4 is connected with a pin C7 of the SIM module, and a pin 2 of the first electrostatic tube D4 is grounded; the 4 th pin of the first electrostatic tube D4 is connected to the C3 pin of the SIM module, the 5 th pin of the first electrostatic tube D4 is connected to the C2 pin of the SIM module, and the 6 th pin of the first electrostatic tube D4 is connected to the C1 pin of the SIM module.
According to the technical scheme provided by the embodiment of the application, the program programming module comprises: JP3 interface and a second electrostatic tube D5; the 1 pin of the JP3 interface is grounded, and the 2 pin of the JP3 interface is connected with a 3.3V power supply for supplying power;
the 2 feet of the second electrostatic tube D5 are grounded, the 4 feet of the second electrostatic tube D5 are connected with the 4 feet of the JP3 interface, the 5 feet of the second electrostatic tube D5 are connected with the 3 feet of the JP3 interface, and the 6 feet of the second electrostatic tube D5 are connected with the 2 feet of the JP3 interface.
According to the technical scheme provided by the embodiment of the application, the temperature acquisition module comprises: a temperature probe pin T4+, a temperature probe pin T4-, a first resistor R81, a second resistor R83, a first capacitor C44 and a second capacitor C45;
the temperature probe pin T4+ is connected with one end of the second capacitor C45, and the other end of the second capacitor C45 is connected with the temperature probe pin T4-and is grounded;
the temperature probe pin T4+ is connected with one end of the first resistor R81, and the other end of the first resistor R81 is connected with a 3.3V power supply for supplying power;
the temperature probe pin T4+ is connected with one end of the second resistor R83, the other end of the second resistor R83 is connected with the T4 analog-to-digital conversion interface and one end of the first capacitor C44, and the other end of the first capacitor is grounded;
the temperature probe pin T4+ is also connected with the cathode of the TVS tube D6, and the double cathodes of the TVS tube D6 are grounded.
The utility model has the advantages that: the utility model provides a fire alarm circuit of static is prevented in lightning protection, include: the device comprises an MCU processor, a 485 communication module, a 485 pre-stage module, a GPRS communication module, an SIM module, a temperature acquisition module, a program programming module and a power supply module;
the temperature acquisition module acquires temperature signals of equipment or circuits in real time and sends the temperature signals to the MCU processor, and when the acquired temperature signals are larger than a set threshold value, the MCU processor generates fire alarm signals and sends the alarm signals to an operator through the GPRS communication module or is connected with external alarm equipment through the 485 communication module, so that the function of alarming is achieved.
The 485 communication module is connected with the MCU processor through a data interface P1 and is used for communicating with external equipment; meanwhile, the 485 pre-stage module is connected with a 485A pin and a 485B pin of the 485 communication module; when the current of the internal circuit of the 485 communication module is overlarge, the 485 pre-stage module can provide limiting and protecting effects for the internal circuit in the 485 communication module;
the temperature acquisition module is connected with the input end of the MCU processor and used for acquiring temperature data; the temperature acquisition module is provided with a TVS tube D6 for clamping and protecting the loop voltage; the TVS tube D6 is installed on the temperature acquisition module, so that circuit damage caused by voltage dip of an internal circuit can be effectively prevented.
The GPRS communication module is connected with the MCU processor through a data interface P2 and is configured for wireless communication; the GPRS communication module is connected with the SIM1 module; the SIM module is connected with a first electrostatic tube D4; the program programming module is connected with the MCU processor and is used for programming programs to the MCU processor; the program programming module is connected with a second electrostatic tube D5; in practical field application, the SIM card and the program programming module often need to be operated repeatedly, which is likely to cause electrostatic interference in the circuit, and the first electrostatic tube D4 is connected to the SIM card module, and the second electrostatic tube D5 is connected to the program programming module, which can effectively prevent electrostatic interference in the circuit.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of a lightning and static electricity protection fire alarm circuit provided in the present application;
FIG. 2 is a circuit diagram of the 485 front stage module shown in FIG. 1;
fig. 3 is a circuit diagram of the SIM module shown in fig. 1;
FIG. 4 is a circuit diagram of a program download module of FIG. 1;
FIG. 5 is a circuit diagram of the temperature acquisition module shown in FIG. 1;
fig. 6 is a circuit diagram illustrating a connection between the GPRS communication module of fig. 1 and the SIM module;
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
Please refer to fig. 1, which is a schematic diagram of a fire alarm circuit with lightning protection and static electricity protection provided in the present application, including: the device comprises an MCU processor, a 485 communication module, a 485 pre-stage module, a GPRS communication module, an SIM module, a temperature acquisition module, a program programming module and a power supply module;
the 485 communication module is connected with the MCU processor through a data interface P1 and is used for communicating with external equipment;
the 485 pre-stage module is connected with a 485A pin and a 485B pin of the 485 communication module, and the 485 pre-stage module is used for limiting and protecting a circuit when the current of the 485 communication module is overlarge;
the GPRS communication module is connected with the MCU processor through a data interface P2 and is configured for wireless communication;
the GPRS communication module is connected with the SIM module; preferably, the GPRS communication module and the SIM module may be connected as shown in fig. 6, and a power supply pin CCVCC, a clock pin CCCLK, an IO input/output pin CCIO, a reset pin CCRST, an input pin CCIN, and a ground pin CCGND of the GPRS communication module are respectively connected to the SIM module;
a first electrostatic tube D4 is connected to the SIM module, and the first electrostatic tube D4 is used for preventing electrostatic interference in a circuit;
the program programming module is connected with the MCU processor and is used for programming programs to the MCU processor; the program programming module is connected with a second electrostatic tube D5, and the second electrostatic tube D5 is used for preventing electrostatic interference in a circuit;
the temperature acquisition module is connected with the input end of the MCU processor and used for acquiring temperature data; the temperature acquisition module is provided with a TVS tube D6 for clamping and protecting the loop voltage;
the power supply module supplies power to the system.
The temperature acquisition module can acquire the temperature signal of equipment or circuit in real time and send for the MCU treater, and when the temperature signal who gathers was greater than the settlement threshold value, the MCU treater generated fire alarm signal and sent alarm signal to the operator through GPRS communication module, or is connected with outside alarm device through 485 communication module, plays the effect of reporting to the police.
Meanwhile, the fire alarm circuit has the functions of lightning protection and static prevention, and specifically comprises the following steps:
the 485 communication module is connected with the MCU processor through a data interface P1 and is used for communicating with external equipment; meanwhile, the 485 pre-stage module is connected with a 485A pin and a 485B pin of the 485 communication module; when the current of the internal circuit of the 485 communication module is overlarge, the 485 pre-stage module can provide limiting and protecting effects for the internal circuit in the 485 communication module;
the temperature acquisition module is connected with the input end of the MCU processor and used for acquiring temperature data; the temperature acquisition module is provided with a TVS tube D6 for clamping and protecting the loop voltage; the TVS tube D6 is installed on the temperature acquisition module, so that circuit damage caused by voltage dip of an internal circuit can be effectively prevented.
The GPRS communication module is connected with the MCU processor through a data interface P2 and is configured for wireless communication; the GPRS communication module is connected with the SIM1 module; the SIM module is connected with a first electrostatic tube D4; the program programming module is connected with the MCU processor and is used for programming programs to the MCU processor; the program programming module is connected with a second electrostatic tube D5; in practical field application, the SIM card and the program programming module need to be repeatedly operated, which is likely to cause electrostatic interference in the circuit, and the SIM card module is connected to the first electrostatic tube D4, and the program programming module is connected to the second electrostatic tube D5, which can effectively prevent electrostatic interference in the circuit;
among them, in a preferred embodiment of the 485 front stage module, as shown in fig. 2, the 485 front stage module includes: a first fuse F1, a second fuse F2, and a discharge tube D7;
a pin 1 of the discharge tube D7 is connected with one end of the first fuse tube F1, the other end of the first fuse tube F1 is connected with the pin 485A, and a pin 1 of the discharge tube D7 is also connected with an LB pin for communicating with external equipment; the pin 2 of the discharge tube D7 is connected with one end of the second fuse F2, the other end of the second fuse F2 is connected with the pin 485B, and the pin 2 of the discharge tube D7 is also connected with an HA pin for communication with external equipment; the 3-pin of the discharge tube D7 is grounded.
The discharge tube D7 can adopt a B3D090L-C type discharge tube, which can respond to fast rising transient voltage quickly, and has ultra-low capacitance, which is more favorable for reducing insertion loss and return loss to the maximum extent, ensuring the integrity of signals and simultaneously more favorable for protecting circuits.
In a preferred embodiment of the SIM module, as shown in fig. 3, pin 1 of the first electrostatic tube D4 is connected to pin C7 of the SIM module, and pin 2 of the first electrostatic tube D4 is grounded; the 4 th pin of the first electrostatic tube D4 is connected to the C3 pin of the SIM module, the 5 th pin of the first electrostatic tube D4 is connected to the C2 pin of the SIM module, and the 6 th pin of the first electrostatic tube D4 is connected to the C1 pin of the SIM module.
In a preferred embodiment of the program programming module, as shown in fig. 4, the program programming module includes: JP3 interface and a second electrostatic tube D5; the 1 pin of the JP3 interface is grounded, and the 2 pin of the JP3 interface is connected with a 3.3V power supply for supplying power;
the 2 feet of the second electrostatic tube D5 are grounded, the 4 feet of the second electrostatic tube D5 are connected with the 4 feet of the JP3 interface, the 5 feet of the second electrostatic tube D5 are connected with the 3 feet of the JP3 interface, and the 6 feet of the second electrostatic tube D5 are connected with the 2 feet of the JP3 interface.
The first electrostatic tube D4 and the second electrostatic tube D5 may be SMF05C electrostatic tubes, and the SMF05C electrostatic tube has an advantage that it is a solid-state device designed for transient suppression, and provides ideal protection characteristics, including fast response time, low operating voltage and clamping voltage, and no degradation.
In a preferred embodiment of the temperature acquisition module, as shown in fig. 5, the temperature acquisition module includes: a temperature probe pin T4+, a temperature probe pin T4-, a first resistor R81, a second resistor R83, a first capacitor C44 and a second capacitor C45;
the temperature probe pin T4+ is connected with one end of the second capacitor C45, and the other end of the second capacitor C45 is connected with the temperature probe pin T4-and is grounded;
the temperature probe pin T4+ is connected with one end of the first resistor R81, and the other end of the first resistor R81 is connected with a 3.3V power supply for supplying power;
the temperature probe pin T4+ is connected with one end of the second resistor R83, the other end of the second resistor R83 is connected with the T4 analog-to-digital conversion interface and one end of the first capacitor C44, and the other end of the first capacitor is grounded;
the temperature probe pin T4+ is also connected with the cathode of the TVS tube D6, and the double cathodes of the TVS tube D6 are grounded.
The TVS tube D6 can adopt PESD3V3L2BT type TVS tube, which has low impedance and fast conduction time and can provide reliable electrostatic protection. Meanwhile, the TVS tube of the PESD3V3L2BT type has two cathode pins and one double cathode pin, so that two temperature acquisition modules can share one TVS tube. For example, the two temperature acquisition modules respectively correspond to a temperature probe pin T4+ and a temperature probe pin T3 +; the temperature probe pin T3+ and the temperature probe pin T4+ can be respectively connected with two cathode pins of a PESD3V3L2BT type TVS tube, and the double-cathode pin of the PESD3V3L2BT type TVS tube is grounded. The circuit structure is facilitated to be optimized, and meanwhile, the cost is reduced.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (5)
1. A fire alarm circuit with lightning protection and static electricity prevention is characterized by comprising an MCU processor, a 485 communication module, a 485 pre-stage module, a GPRS communication module, an SIM module, a temperature acquisition module, a program programming module and a power module;
the 485 communication module is connected with the MCU processor through a data interface P1 and is used for communicating with external equipment;
the 485 pre-stage module is connected with a 485A pin and a 485B pin of the 485 communication module, and the 485 pre-stage module is used for limiting and protecting a circuit when the current of the 485 communication module is overlarge;
the GPRS communication module is connected with the MCU processor through a data interface P2 and is configured for wireless communication;
the GPRS communication module is connected with the SIM1 module; a first electrostatic tube D4 is connected to the SIM module, and the first electrostatic tube D4 is used for preventing electrostatic interference in a circuit;
the program programming module is connected with the MCU processor and is used for programming programs to the MCU processor; the program programming module is connected with a second electrostatic tube D5, and the second electrostatic tube D5 is used for preventing electrostatic interference in a circuit;
the temperature acquisition module is connected with the input end of the MCU processor and used for acquiring temperature data; the temperature acquisition module is provided with a TVS tube D6 for clamping and protecting the loop voltage;
the power supply module supplies power to the system.
2. The lightning and static electricity protection fire alarm circuit of claim 1, wherein: the 485 preceding stage module includes: a first fuse F1, a second fuse F2, and a discharge tube D7;
a pin 1 of the discharge tube D7 is connected with one end of the first fuse tube F1, the other end of the first fuse tube F1 is connected with the pin 485A, and a pin 1 of the discharge tube D7 is also connected with an LB pin for communicating with external equipment; the pin 2 of the discharge tube D7 is connected with one end of the second fuse F2, the other end of the second fuse F2 is connected with the pin 485B, and the pin 2 of the discharge tube D7 is also connected with an HA pin for communication with external equipment; the 3-pin of the discharge tube D7 is grounded.
3. The lightning and static electricity protection fire alarm circuit of claim 1, wherein: pin 1 of the first electrostatic tube D4 is connected to pin C7 of the SIM module, and pin 2 of the first electrostatic tube D4 is grounded; the 4 th pin of the first electrostatic tube D4 is connected to the C3 pin of the SIM module, the 5 th pin of the first electrostatic tube D4 is connected to the C2 pin of the SIM module, and the 6 th pin of the first electrostatic tube D4 is connected to the C1 pin of the SIM module.
4. The lightning and static electricity protection fire alarm circuit of claim 1, wherein: the program programming module comprises: JP3 interface and a second electrostatic tube D5; the 1 pin of the JP3 interface is grounded, and the 2 pin of the JP3 interface is connected with a 3.3V power supply for supplying power;
the 2 feet of the second electrostatic tube D5 are grounded, the 4 feet of the second electrostatic tube D5 are connected with the 4 feet of the JP3 interface, the 5 feet of the second electrostatic tube D5 are connected with the 3 feet of the JP3 interface, and the 6 feet of the second electrostatic tube D5 are connected with the 2 feet of the JP3 interface.
5. The lightning and static electricity protection fire alarm circuit of claim 1, wherein: the temperature acquisition module includes: a temperature probe pin T4+, a temperature probe pin T4-, a first resistor R81, a second resistor R83, a first capacitor C44 and a second capacitor C45;
the temperature probe pin T4+ is connected with one end of the second capacitor C45, and the other end of the second capacitor C45 is connected with the temperature probe pin T4-and is grounded;
the temperature probe pin T4+ is connected with one end of the first resistor R81, and the other end of the first resistor R81 is connected with a 3.3V power supply for supplying power;
the temperature probe pin T4+ is connected with one end of the second resistor R83, the other end of the second resistor R83 is connected with the T4 analog-to-digital conversion interface and one end of the first capacitor C44, and the other end of the first capacitor is grounded;
the temperature probe pin T4+ is also connected with the cathode of the TVS tube D6, and the double cathodes of the TVS tube D6 are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020385610.9U CN212009797U (en) | 2020-03-24 | 2020-03-24 | Fire alarm circuit of static is prevented in lightning protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020385610.9U CN212009797U (en) | 2020-03-24 | 2020-03-24 | Fire alarm circuit of static is prevented in lightning protection |
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| CN212009797U true CN212009797U (en) | 2020-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281052A (en) * | 2021-05-07 | 2021-08-20 | 华中科技大学 | Wireless temperature measurement emission controller for low-frequency acquisition of surface temperature of piston of internal combustion engine |
-
2020
- 2020-03-24 CN CN202020385610.9U patent/CN212009797U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281052A (en) * | 2021-05-07 | 2021-08-20 | 华中科技大学 | Wireless temperature measurement emission controller for low-frequency acquisition of surface temperature of piston of internal combustion engine |
| CN113281052B (en) * | 2021-05-07 | 2022-01-28 | 华中科技大学 | Wireless temperature measurement emission controller for low-frequency acquisition of surface temperature of piston of internal combustion engine |
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