CN217238788U - Two-wire system fire-fighting bus code receiving and transmitting circuit - Google Patents
Two-wire system fire-fighting bus code receiving and transmitting circuit Download PDFInfo
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- CN217238788U CN217238788U CN202220727712.3U CN202220727712U CN217238788U CN 217238788 U CN217238788 U CN 217238788U CN 202220727712 U CN202220727712 U CN 202220727712U CN 217238788 U CN217238788 U CN 217238788U
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Abstract
The application discloses a two-wire fire-fighting bus code receiving and transmitting circuit, which comprises a code receiving circuit and a code transmitting circuit; the code sending circuit comprises a first triode and a second triode, wherein the collector of the first triode is connected with the output end, the emitter of the first triode is connected with the base of the second triode, the base of the first triode is connected with the collector of the second triode, the emitter of the second triode is grounded, and the collector of the second triode is connected with the control circuit; the code receiving circuit comprises a third triode and a voltage stabilizing diode, the negative electrode of the voltage stabilizing diode is connected with the input end, the positive electrode of the voltage stabilizing diode is connected with the base electrode of the third triode, the collector electrode of the third triode is connected with the control circuit, and the emitting electrode of the third triode is grounded. The problem of accuracy and anti-interference of digital signal transmission is solved, so that the code receiving and transmitting circuit becomes simple and reliable, and the cost is reduced.
Description
Technical Field
The application relates to a two-wire fire-fighting bus product, in particular to a two-wire fire-fighting bus code receiving and transmitting circuit.
Background
The electric fire device is mainly applied to general industry and civil buildings, has the functions of analyzing fire accidents caused by circuit reasons in important places of the general industry and civil buildings, accurately detecting the leakage change in a circuit in real time, and immediately sending an alarm signal when the circuit to be detected is abnormal. The system adopts the real-time monitoring of the detector (the residual zero sequence current transformer, the temperature sensor and the arc fault sensor) and the secondary calculation of the data of the sensor, then the data are converted into digital signals, the real-time situation on the circuit is displayed, and meanwhile, the real-time situation on the circuit is transmitted to an upper computer through a line communication bus, the invisible and untouchable power utilization situation is changed into visible digital monitoring, and a comprehensive solution is provided for effectively preventing electrical fire.
The fire-fighting monitoring system generally comprises a fire-fighting emergency lighting and evacuation indicating system, a fire-fighting fire door monitoring system, a fire-fighting power supply monitoring system, a fire-fighting electrical fire system, a fire-fighting fire alarm system, an intelligent lighting control system and the like. At present, the fire control monitoring system controlled by the MCU is adopted, the power supply function and the communication function are separated, a power supply module and a communication module are required to be respectively arranged in the whole fire control monitoring system, the power supply module is required to use power supply cable incoming line power transmission, the communication module is required to use communication cable incoming line signal transmission, the size of the whole system is large, meanwhile, signal interference can be generated between power supply and communication, the instability of signal transmission exists, and the accuracy of the whole fire control monitoring system is influenced.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application will be solved provides a two-wire system fire control bus code receiving and dispatching circuit, has solved digital signal transmission's accuracy problem and anti-interference problem, makes code receiving and dispatching circuit become simple reliable and reduced the cost again.
The technical scheme adopted by the application is as follows: the two-wire fire-fighting bus code receiving and transmitting circuit comprises a code receiving circuit and a code transmitting circuit;
the code sending circuit comprises a first triode and a second triode, wherein the collector of the first triode is connected with the output end, the emitter of the first triode is connected with the base of the second triode, the base of the first triode is connected with the collector of the second triode, the emitter of the second triode is grounded, and the collector of the second triode is connected with the control circuit;
the code receiving circuit comprises a third triode and a voltage stabilizing diode, the negative electrode of the voltage stabilizing diode is connected with the input end, the positive electrode of the voltage stabilizing diode is connected with the base electrode of the third triode, the collector electrode of the third triode is connected with the control circuit, and the emitting electrode of the third triode is grounded.
Compared with the prior art, the code sending circuit has the advantages that the code sending circuit comprises the first triode and the second triode, the input end of the code sending circuit is connected with the control circuit and receives the code returning information of the control module, the output end of the code sending circuit is connected with the bus, and when the code returning information is in a high level, the code sending circuit generates a current signal and pulls down the input voltage of the bus; the code receiving circuit comprises a third triode and a voltage stabilizing diode, the output end of the code receiving circuit is connected to the code receiving end of the control circuit, and a code receiving signal is input into the control circuit. The method and the device are accurate and reliable in digital signal transmission and avoid interference. And the whole circuit structure of the code receiving and transmitting circuit is simple, and the cost is effectively reduced.
In some embodiments of the present application, the zener diode is a 9.1V zener diode. So that the base of the third transistor is stabilized at a predetermined voltage value by the zener diode, the emitter thereof outputs a voltage of a constant value. Within a certain range, the output voltage is kept unchanged no matter the input voltage is increased or decreased, and no matter the load resistance is changed. The voltage stabilizing diode plays a role in controlling the third triode to work.
In some embodiments of the present application, the first transistor is an NPN transistor of the type MMBTA06LT 1G. The second triode adopts an NPN triode with the model of MMBTA06LT 1G. The third triode adopts an NPN triode with the model of MMBTA06LT 1G.
In some embodiments of the present application, the code sending circuit includes a fifth resistor, one end of the fifth resistor is connected to the emitter of the first transistor, and the other end of the fifth resistor is grounded.
In some embodiments of the present application, one end of the fifth resistor is connected to the base of the second transistor, and the other end of the fifth resistor is connected to the emitter of the second transistor.
In some embodiments of the present application, the collector and the emitter of the second transistor are connected through a fourth resistor.
In some embodiments of the present application, the code sending circuit includes a third resistor, one end of the third resistor is connected to the collector of the second transistor, and the other end of the third resistor is connected to the control circuit.
In some embodiments of the present application, the anode of the zener diode is connected to the base of the third transistor through the seventh resistor, and the base and the emitter of the third transistor are connected through the eighth resistor.
In some embodiments of the present application, the base of the third transistor is connected to the positive electrode of the power supply through a sixth resistor.
Drawings
The present application will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.
FIG. 1 is a code transmitting circuit of the present application;
fig. 2 is a decoding circuit according to the present application.
Detailed Description
The present application will now be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
As shown in fig. 1 and 2: the two-wire fire-fighting bus code receiving and transmitting circuit comprises a code receiving circuit and a code transmitting circuit;
the code sending circuit comprises a first triode Q1 and a second triode Q2, wherein the collector of the first triode Q1 is connected with the output end, the emitter of the first triode Q1 is connected with the base of the second triode Q2, the base of the first triode Q1 is connected with the collector of the second triode Q2, the emitter of the second triode Q2 is grounded, and the collector of the second triode Q2 is connected with the control circuit;
the code receiving circuit comprises a third triode Q3 and a voltage-stabilizing diode Z2, the negative electrode of the voltage-stabilizing diode Z2 is connected with the input end, the positive electrode of the voltage-stabilizing diode Z2 is connected with the base electrode of the third triode Q3, the collector electrode of the third triode Q3 is connected with the control circuit, and the emitter electrode of the third triode Q3 is grounded. The code receiving circuit receives the waveforms on the two buses and analyzes the data.
And the code receiving end of the control circuit is connected with the output end of the code receiving circuit, and the control circuit enters a code receiving stage when the level jumps to receive code receiving information transmitted by the code receiving circuit. The control module generates a code return signal according to the received signal; the code returning signal is input to the input end of the code sending circuit through the code returning end of the control circuit.
The Zener diode Z2 adopts a Zener diode with 9.1V stabilized voltage. So that the base of the third transistor Q3 is stabilized at a predetermined voltage by the zener diode Z2, and the zener diode Z2 functions to control the operation of the third transistor Q3.
The first triode Q1 adopts an NPN triode with the model of MMBTA06LT 1G. The second triode Q2 adopts an NPN triode with the model of MMBTA06LT 1G. The third triode Q3 adopts an NPN triode with the model of MMBTA06LT 1G.
As shown in fig. 1: the code sending circuit comprises a fifth resistor R5, one end of the fifth resistor R5 is connected with an emitter of a first triode Q1, and the other end of the fifth resistor R5 is grounded. One end of the fifth resistor R5 is connected with the base electrode of the second triode Q2, and the other end of the fifth resistor R5 is connected with the emitter electrode of the second triode Q2. The collector and the emitter of the second triode Q2 are connected through a fourth resistor R4. The code sending circuit comprises a third resistor R3, one end of the third resistor R3 is connected with the collector of the second triode Q2, and the other end of the third resistor R3 is connected with the control circuit.
As shown in fig. 2, the anode of the zener diode Z2 is connected to the base of the third transistor Q3 through a seventh resistor R7, and the base and the emitter of the third transistor Q3 are connected through an eighth resistor R8. The base of the third triode Q3 is connected with the positive electrode of the power supply through a sixth resistor R6.
The present application has been described in detail, and the principles and embodiments of the present application have been described herein using specific examples, which are provided only to help understand the present application and its core concept. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can also make several improvements and modifications, and those improvements and modifications also fall into the protection scope of the claims of the present application.
Claims (10)
1. The two-wire system fire-fighting bus receiving and transmitting code circuit is characterized by comprising a receiving code circuit and a transmitting code circuit;
the code sending circuit comprises a first triode and a second triode, wherein the collector of the first triode is connected with the output end, the emitter of the first triode is connected with the base of the second triode, the base of the first triode is connected with the collector of the second triode, the emitter of the second triode is grounded, and the collector of the second triode is connected with the control circuit;
the code receiving circuit comprises a third triode and a voltage stabilizing diode, the negative electrode of the voltage stabilizing diode is connected with the input end, the positive electrode of the voltage stabilizing diode is connected with the base electrode of the third triode, the collector electrode of the third triode is connected with the control circuit, and the emitting electrode of the third triode is grounded.
2. The two-wire fire fighting bus transceiving code circuit according to claim 1, wherein the transceiving code circuit includes a fifth resistor, one end of the fifth resistor is connected to an emitter of the first triode, and the other end of the fifth resistor is grounded.
3. The two-wire fire fighting bus transceiver code circuit according to claim 2, wherein one end of the fifth resistor is connected to the base of the second transistor, and the other end of the fifth resistor is connected to the emitter of the second transistor.
4. The two-wire fire fighting bus transceiver code circuit according to claim 1, wherein the collector and emitter of the second transistor are connected by a fourth resistor.
5. The two-wire fire fighting bus transceiver circuit according to claim 1, wherein the transceiver circuit includes a third resistor, one end of the third resistor is connected to a collector of the second transistor, and the other end of the third resistor is connected to the control circuit.
6. The two-wire fire fighting bus transceiver code circuit according to any of claims 1 to 5, wherein the positive pole of the zener diode is connected to the base of the third triode through a seventh resistor, and the base and the emitter of the third triode are connected through an eighth resistor.
7. The two-wire fire fighting bus transceiver code circuit according to any of claims 1 to 5, wherein the base of the third transistor is connected to the positive pole of the power supply via a sixth resistor.
8. The two-wire fire fighting bus transceiver circuit according to claim 1, wherein the first transistor is an NPN transistor of type MMBTA06LT 1G.
9. The two-wire fire fighting bus transceiver circuit according to claim 1, wherein the second transistor is an NPN transistor of type MMBTA06LT 1G.
10. The two-wire fire fighting bus transceiver circuit according to claim 1, wherein the third transistor is an NPN transistor of type MMBTA06LT 1G.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727712.3U CN217238788U (en) | 2022-03-31 | 2022-03-31 | Two-wire system fire-fighting bus code receiving and transmitting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727712.3U CN217238788U (en) | 2022-03-31 | 2022-03-31 | Two-wire system fire-fighting bus code receiving and transmitting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN217238788U true CN217238788U (en) | 2022-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220727712.3U Active CN217238788U (en) | 2022-03-31 | 2022-03-31 | Two-wire system fire-fighting bus code receiving and transmitting circuit |
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| Country | Link |
|---|---|
| CN (1) | CN217238788U (en) |
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- 2022-03-31 CN CN202220727712.3U patent/CN217238788U/en active Active
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