CN213342250U

CN213342250U - Two-bus relay code-returning circuit

Info

Publication number: CN213342250U
Application number: CN202022654782.4U
Authority: CN
Inventors: 朱嘉祥; 方江松; 陈桂臣; 董俊敏; 黄观生
Original assignee: Guangzhou Protectwell Electronic & Technology Co ltd
Current assignee: Guangzhou Protectwell Electronic & Technology Co ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-06-01
Anticipated expiration: 2030-11-16

Abstract

The embodiment of the application discloses a two-bus relay code return circuit. According to the technical scheme provided by the embodiment of the application, the code returning detection module detects the first code returning signal and the first code repeating signal uploaded by the next section of two buses, and the code returning driving module and the code repeating driving module are controlled to send the second code returning signal and the second code repeating signal to the incoming line terminal based on the first code returning signal and the first code repeating signal respectively, so that the second code returning signal and the second code repeating signal are sent to the upper section of two buses, and the communication distance of the two buses and the load carrying capacity are effectively prolonged.

Description

Two-bus relay code-returning circuit

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a two-bus relay code return circuit.

Background

The fire-fighting two-bus is a two-wire bus technology capable of providing power and communication, and compared with a four-wire system, the two-bus combines a power supply line and a signal line into a whole, so that signals and power supply share one bus.

Typically, a group of buses is typically fully loaded with around 200 modules or probes, which can reach a communication distance of 1000m-2000 m. However, when the field wiring is too long (greater than 1000m), unstable communication between the two buses occurs, for example, communication voltage drops due to the fact that the equivalent resistance of the buses is large, communication waveform distortion due to mismatching of parasitic inductance capacitance and long line communication impedance causes the quality of a code returning signal sent by equipment such as a field module and a probe to drop, and normal communication between the two buses is affected.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a two-bus relay code returning circuit to ensure normal sending of a code returning signal in two buses.

In a first aspect, an embodiment of the present application provides a two-bus relay loop code circuit, which is applied to a two-bus signal relay, where the two-bus signal relay includes an incoming terminal and an outgoing terminal, and includes a loop code detection module, a loop code driving module, and a repetition code driving module, where:

the incoming line terminal is provided with an anode input port and a cathode input port, and the outgoing line terminal is provided with an anode output port and a cathode output port;

the detection end of the code returning detection module is connected with the positive output port of the wire outlet terminal, the output end of the code returning detection module is connected with the code returning driving module and the driving end of the coincident code driving module, the output end of the code returning driving module and the output end of the coincident code driving module are connected with the positive input port of the wire inlet terminal, the code returning detection module is used for detecting a first code returning signal and a first coincident code signal received by the wire outlet terminal, and based on the first code returning signal, the code returning driving module outputs a second code returning signal to the wire inlet terminal, and based on the first coincident code signal, the coincident code driving module outputs a second coincident code signal to the wire inlet terminal.

Further, it includes sixth resistance, sixth switch tube, seventh resistance, second diode, returns a yard detecting element and duplicate code detecting element to return a yard detection module, the sixth switch tube is provided with control end, first link and second link, wherein:

one end of the sixth resistor is connected with a voltage source, the other end of the sixth resistor is connected with the first connection end of the sixth switching tube, the second connection end of the sixth switching tube is connected with the anode output port of the wire outlet terminal, the control end of the sixth switching tube is connected with the voltage source through the seventh resistor, the control end of the sixth switching tube is connected with the anode of the second diode, the cathode of the second diode is connected with a code sending receiving module, and the code sending receiving module pulls up the potential of the cathode of the second diode when detecting that the anode input port of the wire inlet terminal outputs a code returning level signal, so that the sixth switching tube is conducted;

the detection end of the code returning detection unit is connected to the first connection end of the sixth switch tube, the output end of the code returning detection unit is connected to the driving end of the code returning driving module, and the code returning detection unit sends a code returning driving signal to the driving end of the code returning driving module according to the voltage of the first connection end of the sixth switch tube, so that the code returning driving module outputs a second code returning signal to the wire inlet terminal;

the detection end of the coincident code detection unit is connected to the first connection end of the sixth switch tube, the output end of the coincident code detection unit is connected to the driving end of the coincident code driving module, and the coincident code detection unit sends out a coincident code driving signal to the driving end of the coincident code driving module according to the voltage of the first connection end of the sixth switch tube, so that the coincident code driving module outputs a second coincident code signal to the incoming line terminal.

Furthermore, the code returning detection unit comprises a first comparator and a first phase inverter, a non-inverting input end of the first comparator is connected to the first connection end of the sixth switching tube, a reverse input end of the first comparator is connected to the code returning detection voltage source, an output end of the first comparator is connected to an input end of the first phase inverter, and an output end of the first phase inverter is connected to the driving end of the code returning driving module.

Further, the code returning driving module comprises a seventh switch tube, an eighth resistor and a ninth resistor, wherein the seventh switch tube and the eighth switch tube are provided with a control end, a first connection end and a second connection end, and wherein:

the control end of the seventh switch tube is connected to the output end of the first inverter, the first connection end of the seventh switch tube is connected to the positive input port of the incoming line terminal, the second connection end of the seventh switch tube is grounded through the eighth resistor, the second connection end of the seventh switch tube is connected to the control end of the eighth switch tube through the ninth resistor, the first connection end of the eighth switch tube is connected to the control end of the seventh switch tube, and the second connection end of the eighth switch tube is grounded.

Further, the resistance value of the eighth resistor is 12.1 Ω, and the turn-on voltage of the eighth switching tube is 0.7V.

Furthermore, the sixth resistor is composed of two resistors which are connected in parallel and have resistance values of 240 Ω, a voltage source connected with the sixth resistor is a 24V voltage source, and the code returning detection voltage source is a 21.2V voltage source.

Furthermore, the duplicate detection unit comprises a second comparator and a second inverter, a non-inverting input end of the second comparator is connected to the first connection end of the sixth switching tube, a reverse input end of the second comparator is connected to the duplicate detection voltage source, an output end of the second comparator is connected to an input end of the second inverter, and an output end of the second inverter is connected to the driving end of the duplicate driving module.

Further, the duplicate code driving module includes a ninth switching tube, a tenth resistor and an eleventh resistor, and the ninth switching tube and the tenth switching tube are both provided with a control end, a first connection end and a second connection end, wherein:

the control end of the ninth switch tube is connected to the output end of the second inverter, the first connection end of the ninth switch tube is connected to the positive input port of the incoming line terminal, the second connection end of the ninth switch tube is grounded through the tenth resistor, the second connection end of the ninth switch tube is connected to the control end of the tenth switch tube through the eleventh resistor, the first connection end of the tenth switch tube is connected to the control end of the ninth switch tube, and the second connection end of the tenth switch tube is grounded.

Further, the resistance value of the tenth resistor is 12.1 Ω, and the turn-on voltage of the tenth switching tube is 0.7V.

Furthermore, the sixth resistor is composed of two resistors which are connected in parallel and have resistance values of 240 Ω, a voltage source connected with the sixth resistor is a 24V voltage source, and the code returning detection voltage source is a 15.6V voltage source.

According to the embodiment of the application, the code returning detection module detects the first code returning signal and the first code repeating signal uploaded by the next section of the second bus, and controls the code returning driving module and the code repeating driving module to send the second code returning signal and the second code repeating signal to the incoming line terminal based on the first code returning signal and the first code repeating signal respectively, so that the second code returning signal and the second code repeating signal are sent to the upper section of the second bus, and the communication distance of the second bus and the load carrying capacity are effectively prolonged.

Drawings

Fig. 1 is a schematic block diagram of a two-bus signal repeater according to an embodiment of the present disclosure;

fig. 2 is a schematic circuit diagram of a two-bus signal repeater according to an embodiment of the present disclosure;

fig. 3 is a schematic circuit diagram of an incoming terminal, an outgoing terminal and a power module according to an embodiment of the present disclosure;

fig. 4 is a schematic circuit structure diagram of a non-polar processing module according to an embodiment of the present disclosure;

fig. 5 is a schematic circuit structure diagram of a code transmitting and receiving module according to an embodiment of the present disclosure;

fig. 6 is a schematic circuit structure diagram of a code sending driving module, a code returning detection module and a short circuit detection module according to an embodiment of the present application;

fig. 7 is a schematic circuit structure diagram of a code-returning detection unit and a code-duplication detection unit according to an embodiment of the present disclosure;

fig. 8 is a schematic circuit structure diagram of a code-returning driving module according to an embodiment of the present disclosure;

fig. 9 is a schematic circuit structure diagram of a duplicate code driving module according to an embodiment of the present disclosure;

fig. 10 is a schematic circuit structure diagram of a short circuit detection unit according to an embodiment of the present application;

fig. 11 is a schematic circuit structure diagram of a short circuit driving module according to an embodiment of the present disclosure;

fig. 12 is a schematic diagram of a two-bus communication system according to an embodiment of the present disclosure.

Reference numerals: 1. an incoming terminal; 2. an outlet terminal; 3. a code sending and receiving module; 4. a code sending driving module; 5. a code returning detection module; 6. a code returning driving module; 7. a duplicate code driving module; 8. a code return detection unit; 9. a duplicate code detection unit; 10. a short circuit driving module; 11. a short circuit detection unit; 12. a non-polar processing module; 13. a short circuit detection module; 14. and a power supply module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application.

In the description of the embodiments of the present application, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Fig. 1 shows a schematic block diagram of a two-bus signal repeater according to an embodiment of the present disclosure, and referring to fig. 1, the two-bus signal repeater includes an incoming terminal 1, an outgoing terminal 2, a two-bus repeating code-sending circuit, a two-bus repeating code-returning circuit, a two-bus repeating short-circuit detection circuit, and a power module 14, where the two-bus repeating code-sending circuit includes a code-sending receiving module 3 and a code-sending driving module 4, the two-bus repeating code-returning circuit includes a code-returning detection module 5, a code-returning driving module 6, and a code-repeating driving module 7, the two-bus repeating short-circuit detection circuit includes a code-returning detection module 5 and a short-circuit driving module 10, and the code-returning circuit and the short-circuit detection circuit share the same code-returning detection module 5. The power module 14 is used for providing corresponding voltage sources for each electrical appliance in the two-bus signal repeater.

The two-bus relay code sending circuit, the two-bus relay code returning circuit and the two-bus relay short circuit detection circuit can be simultaneously applied to the two-bus signal repeater to jointly complete the code sending, code returning and short circuit detection functions of the two-bus signal repeater, or are independently applied to the two-bus signal repeater to respectively provide the code sending, code returning and short circuit detection functions for the two-bus signal repeater.

Further, incoming line terminal 1 that this embodiment provided is provided with anodal input port and negative pole input port, outgoing line terminal 2 is provided with anodal output port and negative pole output port, send out sign indicating number receiving module 3 and be provided with sense terminal and output, send out sign indicating number drive module 4 and be provided with drive end and output, return sign indicating number detection module 5 and be provided with sense terminal and output, return sign indicating number drive module 6 setting, coincident code drive module 7 and short circuit drive module 10 all are provided with drive end and output.

The detection end of the code sending receiving module 3 is connected to the positive input port of the incoming line terminal 1, the output end of the code sending receiving module 3 is connected to the driving end of the code sending driving module 4, and the output end of the code sending driving module 4 is connected to the positive output port of the outgoing line terminal 2. The code sending receiving module 3 is configured to detect a first code sending signal received by the incoming line terminal 1, and control the code sending driving module 4 to output a second code sending signal of a corresponding level to the outgoing line terminal 2 according to the level corresponding to the first code sending signal. It will be appreciated that when the second code signal reaches the next second bus signal repeater, the second code signal acts as the first code signal for the next second bus signal repeater.

Specifically, the level levels provided by this embodiment include a first level, a second level, and a third level that are sequentially increased, the level values corresponding to the second level include a first level value and a second level value, and the code sending driving module 4 is provided with a switching unit for setting the level values corresponding to the second level as the first level value or the second level value.

Furthermore, the detection end of the code returning detection module 5 is connected to the positive output port of the outgoing line terminal 2, the output end of the code returning detection module 5 is connected to the driving ends of the code returning driving module 6 and the code repeating driving module 7, and the output ends of the code returning driving module 6 and the code repeating driving module 7 are connected to the positive input port of the incoming line terminal 1. The code-returning detection module 5 is configured to detect a first code-returning signal and a first code-repeating signal received by the outgoing line terminal 2, control the code-returning driving module 6 to output a second code-returning signal to the incoming line terminal 1 based on the first code-returning signal, and control the code-repeating driving module 7 to output a second code-repeating signal to the incoming line terminal 1 based on the first code-repeating signal. It is understood that when the second echo signal or the second repeat signal reaches the previous second bus signal repeater, the second echo signal or the second repeat signal serves as the first echo signal or the first repeat signal of the previous second bus signal repeater.

Furthermore, the detection end of the code returning detection module 5 is connected to the positive output port of the outgoing line terminal 2, the output end of the code returning detection module 5 is connected to the driving end of the short circuit driving module 10, and the output end of the short circuit driving module 10 is connected to the positive input port of the incoming line terminal 1. The code-returning detection module 5 is configured to detect a first short-circuit detection signal received by the line terminal 2, and control the short-circuit driving module 10 to output a second short-circuit detection signal to the line terminal 1 based on the first short-circuit detection signal. It will be appreciated that when the second short detection signal reaches the last two bus signal repeater, it acts as the first short detection signal for the last two bus signal repeater.

In a possible embodiment, the two-bus signal repeater provided in this embodiment further includes a non-polarity processing module 12, an incoming line side of the non-polarity processing module 12 is connected to the incoming line terminal 1, and an outgoing line side of the non-polarity processing module 12 is connected to a common connection end of the code sending receiving module 3, the code returning driving module 6, the code repeating driving module 7, and the short circuit driving module 10. Optionally, a switching device for switching the two-bus signal repeater between the non-polarity connection and the polarity connection is provided in the non-polarity processing module 12.

Fig. 2 is a schematic circuit structure diagram of a two-bus signal repeater according to an embodiment of the present disclosure, fig. 3 is a schematic circuit structure diagram of an incoming terminal, an outgoing terminal and a power module according to an embodiment of the present disclosure, where fig. 3 is an enlarged schematic diagram of a portion of the incoming terminal 1, the outgoing terminal 2 and the power module 14 in fig. 2. As shown in fig. 2 and fig. 3, the incoming line terminal 1 (JP 1 in the figure) and the outgoing line terminal 2 (JP 2 in the figure) provided in this embodiment are both provided with first to sixth connection terminals, wherein the third connection terminal of the incoming line terminal 1 is used for accessing the positive LIN + (20-27V power, in this embodiment, a 24V voltage source is taken as an example), the fifth connection terminal and the sixth connection terminal are respectively used as a positive input port (two buses T1) and a negative input port (two buses T2), the fourth connection terminal is grounded, and the fifth connection terminal and the sixth connection terminal of the outgoing line terminal 2 are respectively used as a positive output port (OUT +, SLC +) and a negative output port (GND, SLC +).

Further, a specific circuit connection relationship of the power module 14 provided in this embodiment is shown in fig. 3, and details are not described in this embodiment. In this embodiment, a HT7133-1 voltage regulator chip is adopted to convert a 24V voltage into a 3.3V voltage, a voltage source of 21.2V, 15.6V, and 10V is obtained by dividing the voltage of the 24V voltage source through a resistor R32(1K Ω), a resistor R35(2K Ω), a resistor R40(2K Ω), a resistor R41(2K Ω), and a zener diode D19 (stabilized voltage 14V), and a voltage source of 14V is obtained by dividing the voltage of the 24V voltage source through a resistor R34(2K Ω) and a zener diode D22 (stabilized voltage 14V).

Optionally, a 24V power supply can be connected to the diode D5 from the two buses T1 for power supply, or a 20-27V power supply can be additionally connected for power supply, and when the diode D5 is connected externally, the diode D5 is not welded by default.

Fig. 4 is a schematic circuit structure diagram of a non-polarity processing module according to an embodiment of the present disclosure, and fig. 4 is an enlarged schematic diagram of the non-polarity processing module 12 in fig. 2. As shown in fig. 2 and 4, the non-polar processing module 12 provided in this embodiment includes a first pin connector (P1 in the figure), a second pin connector (P2 in the figure), a first NMOS transistor (Q1 in the figure), a third diode (D3 in the figure), a second NMOS transistor (Q2 in the figure), a fourth diode (D2 in the figure), a first PMOS transistor (Q3 in the figure), a fifth diode (D4 in the figure), a second PMOS transistor (Q4 in the figure), and a sixth diode (D1 in the figure).

The first pin connector and the second pin connector are used as switching devices and used for switching between a non-polarity connection method and a polarity connection method, the first pin connector is provided with a first connection end, a second connection end and a third connection end, and the second pin connector is provided with a first connection end and a second connection end. The first connecting end of the first pin connector is connected to the positive input port of the incoming line terminal 1, the second connecting end of the first pin connector is connected to the detection end of the code receiving module 3, the first connecting end of the second pin connector is connected to the negative input port of the incoming line terminal 1, and the second connecting end of the second pin connector is grounded.

The grid electrode of the first NMOS tube is connected to the cathode electrode of the third diode, the anode electrode of the third diode is connected to the first connection end of the first pin connector, the source electrode of the first NMOS tube is grounded, and the drain electrode of the first NMOS tube is connected to the first connection end of the second pin connector. The grid electrode of the second NMOS tube is connected to the cathode of the fourth diode, the anode of the fourth diode is connected to the first connection end of the second pin connector, the source electrode of the second NMOS tube is grounded, and the drain electrode of the second NMOS tube is connected to the first connection end of the first pin connector. The grid electrode of the first PMOS tube is connected to the anode electrode of the fifth diode, the cathode electrode of the fifth diode is connected to the first connection end of the second pin connector, the source electrode of the first PMOS tube is connected to the third connection end of the first pin connector, and the drain electrode of the first PMOS tube is connected to the first connection end of the first pin connector. The grid electrode of the second PMOS tube is connected to the anode electrode of the sixth diode, the cathode electrode of the sixth diode is connected to the first connection end of the first pin connector, the source electrode of the second PMOS tube is connected to the third connection end of the first pin connector, and the drain electrode of the second PMOS tube is connected to the first connection end of the second pin connector.

When the wiring cap is used for short-circuiting the second connecting end and the third connecting end of the first pin connector, and the second pin connector is not short-circuited, the two bus signal repeaters are in a non-polarity connection method, and when the wiring cap is used for short-circuiting the first connecting end and the second connecting end of the first pin connector and the second pin connector, the two bus signal repeaters are in a polarity connection method.

Fig. 5 is a schematic circuit structure diagram of a code transmitting and receiving module according to an embodiment of the present application, and fig. 5 is an enlarged schematic diagram of the code transmitting and receiving module 3 in fig. 2. As shown in fig. 2 and fig. 5, the code receiving module 3 provided in this embodiment includes a first voltage regulator (D7 in the figure), a first resistor (R16 in the figure), a second resistor (R11 in the figure), a first switch tube (Q11 in the figure), a third resistor (R17 in the figure), a fourth resistor (rR 12 in the figure), and a second switch tube (Q12 in the figure). The first switch tube and the second switch tube are provided with a control end, a first connecting end and a second connecting end, and the reverse breakdown voltage of the first voltage-regulator tube is greater than the second level grade. Specifically, the first switch tube and the second switch tube provided in this embodiment are NPN-type triodes, and the control end, the first connection end, and the second connection end of the triode are a base, a collector, and an emitter, respectively.

Specifically, the cathode of the first voltage regulator tube is electrically connected to the positive input port of the input terminal 1 (the connection with the positive input port of the input terminal 1 is realized by connecting the second connection end of the first pin connector), the anode of the first voltage regulator tube is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to the base of the first switch tube, the collector of the first switch tube is electrically connected to the 3.3V voltage source through the second resistor, the emitter of the first switch tube is grounded, and the collector of the first switch tube is further electrically connected to the code sending driving module 4 (in the figure, the collector of the first switch tube is connected to the code sending driving module 4 through CLK _ 24V).

Furthermore, one end of a third resistor is electrically connected to the positive input port of the line terminal 1 (the connection with the positive input port of the line terminal 1 is realized by connecting the second connection end of the first pin connector), and the other end of the third resistor is electrically connected to the base electrode of the second switch tube, the collector electrode of the second switch tube is connected to a 3.3V voltage source through the fourth resistor, the emitter electrode of the second switch tube is grounded, and the collector electrode of the first switch tube is further connected to the code sending driving module 4 (connected to the code sending driving module 4 through CLK _5V in the figure).

Further, the code receiving module 3 further includes a first accelerating capacitor (C9 in the figure), a second accelerating capacitor (C10 in the figure), a first clamping diode (D8 in the figure), a second clamping diode (D11 in the figure), a third clamping diode (D9 in the figure), and a fourth clamping diode (D12 in the figure).

The two ends of the first accelerating capacitor are respectively connected to the cathode of the first voltage-stabilizing tube and the base of the first switch tube, the second accelerating capacitor is connected with the third resistor in parallel, the cathode of the first clamping diode is connected to the joint point of the second resistor and the voltage source, the anode of the first clamping diode is connected to the collector of the first switch tube, the cathode and the anode of the second clamping diode are respectively connected to the collector and the emitter of the first switch tube, the cathode of the third clamping diode is connected to the joint point of the fourth resistor and the voltage source, the anode of the third clamping diode is connected to the collector of the second switch tube, and the cathode and the anode of the fourth clamping diode are respectively connected to the collector and the emitter of the second switch tube.

Fig. 6 is a schematic circuit structure diagram of a code sending driving module, a code returning detecting module, and a short circuit detecting module according to an embodiment of the present application, and fig. 6 is an enlarged schematic diagram of the code sending driving module 4, the code returning detecting module 5, and the short circuit detecting module 13 in fig. 2. As shown in fig. 2 and fig. 6, the code-sending driving module 4 provided by this embodiment includes a third switching tube (Q16 in the figure), a second voltage-regulator tube (D21 and D22 in the figure), a fourth switching tube (Q17 in the figure), a fifth switching tube (Q13 in the figure), a fifth resistor (R27 in the figure), and a first diode (D16 in the figure), where the third switching tube, the fourth switching tube, and the fifth switching tube are all provided with a control end, a first connection end, and a second connection end, and a stable voltage of the second voltage-regulator tube corresponds to a second level. Specifically, the third switching tube and the fourth switching tube provided in this embodiment are NPN-type triodes, the fifth switching tube is an NPN-type darlington tube, and the control end, the first connection end, and the second connection end of the fifth switching tube are a base, a collector, and an emitter, respectively.

Specifically, the base of the third switch tube is connected to the collector of the first switch tube (corresponding to CLK _24V in the figure), the emitter of the third switch tube is grounded, the collector of the third switch tube is connected to the anode of the second voltage regulator tube, and the cathode of the second voltage regulator tube is connected to the cathode of the first diode. The base electrode of the fourth switching tube is connected with the collector electrode (corresponding to CLK _5V in the figure) of the first switching tube, the emitter electrode of the fourth switching tube is grounded, and the collector electrode of the fourth switching tube is connected with the cathode electrode of the first diode. The base electrode of the fifth switching tube is connected with a 24V voltage source through a fifth resistor, the collector electrode of the fifth switching tube is connected with the 24V voltage source, the emitter electrode of the fifth switching tube is connected with the anode of the first diode, and the anode of the first diode is connected with the anode output port of the outlet terminal 2.

Further, the switching unit provided in this embodiment is specifically a third pin connector (P3 in the drawing), the third pin connector is provided with a first connection end, a second connection end, and a third connection end, and the second voltage regulator tube includes a first voltage regulator tube and a second voltage regulator tube corresponding to the first level value and the second level value, respectively. In this embodiment, the first level value and the second level value are respectively 5V and 8V, and the regulated voltages of the first voltage regulator tube and the second voltage regulator tube are respectively 5.1V and 8.2V.

Specifically, a first connection end of the third pin connector is connected to a cathode of the second voltage regulator tube, a second connection end of the third pin connector is connected to a collector electrode (cathode of the first diode) of the fourth switch tube, a third connection end of the third pin connector is connected to a cathode of the first voltage regulator tube, and anodes of the first voltage regulator tube and the second voltage regulator tube are connected to a collector electrode of the third switch tube. The first connecting end and the second connecting end or the second connecting end and the third connecting end of the third pin connector are in short circuit through the keycap, and the level value corresponding to the stabilized voltage of the second voltage regulator tube is switched to 8V or 5V. Correspondingly, in order to ensure that the code receiving module 3 can recognize the first code signal of 5V and 8V, the reverse breakdown voltage of the first regulator tube provided in this embodiment is 9.1V.

It can be understood that, in the two-bus communication, the transmission information of the level signals with different level levels is generally sent through the two buses, in this embodiment, the first level, the second level and the third level are three level levels of 0V, 5V/8V and 24V, respectively, and the intermediate level can be switched to 5V or 8V according to the actual communication protocol, so that the flexibility and the applicability of the two-bus signal repeater are improved.

Further, the code-transmitting driving module 4 provided by this embodiment further includes a thirteenth switching tube (Q14 in the figure) and a fourteenth resistor (R33 in the figure), a base of the thirteenth switching tube is connected to an emitter of the fifth switching tube, a collector and an emitter of the thirteenth switching tube are respectively connected to the base of the fifth switching tube and the anode of the first diode, and two ends of the fourteenth resistor are respectively connected to the emitter of the fifth switching tube and the anode of the first diode, so that the emitter of the fifth switching tube is connected to the anode of the first diode through the fourteenth resistor. The thirteenth switching tube and the fourteenth resistor form a feedback current-limiting protection circuit, and when the current is short-circuited, the fifth switching tube is cut off to protect the circuit.

Specifically, the resistance of the fourteenth resistor provided in this embodiment is 2 Ω, the turn-on voltage of the thirteenth switching tube is 0.7V, when the current of the outlet terminal 2 reaches 350mA, the base voltage of the thirteenth switching tube reaches 305mA × 2 Ω — 0.7V, the thirteenth switching tube is turned on, the base voltage of the fifth switching tube is pulled down, and the fifth switching tube is turned off to provide a short-circuit protection of 350 mA.

Further, the code-returning detection module 5 provided by this embodiment includes a sixth resistor (parallel resistors R28 and R29 in the figure), a sixth switching tube (Q15 in the figure), a seventh resistor (R31 in the figure), a second diode (D17 in the figure), a code-returning detection unit 8, and a code-returning detection unit 9 (where the code-returning detection unit 8 and the code-returning detection unit 9 are shown in fig. 7). The sixth switching tube is provided with a control end, a first connection end and a second connection end, and specifically, the sixth switching tube provided in this embodiment is an NPN-type triode, and the control end, the first connection end and the second connection end of the sixth switching tube are a base electrode, a collector electrode and an emitter electrode, respectively.

Specifically, one end of the sixth resistor is connected to the 24V voltage source, the other end of the sixth resistor is connected to the collector of the sixth switching tube, the emitter of the sixth switching tube is connected to the positive output port of the outgoing line terminal 2, the base of the sixth switching tube is connected to the 14V voltage source through the seventh resistor, the base of the sixth switching tube is connected to the anode of the second diode, the cathode of the second diode is connected to the code sending and receiving module 3 provided in this embodiment (specifically, connected to the cathode of the first diode in the code sending and receiving module 3), and when detecting that the code sending and receiving module 3 outputs a code level signal (generally, a 5V level signal) from the positive input port of the incoming line terminal 1, the potential of the cathode of the second diode is pulled up, so that the sixth switching tube is turned on.

The detection end of the code returning detection unit 8 is connected to the collector of the sixth switching tube (SLC1_ ANSWER in the figure), and the output end of the code returning detection unit 8 is connected to the driving end of the code returning driving module 6. The code returning detection unit 8 sends a code returning driving signal to the driving end of the code returning driving module 6 according to the voltage of the collector of the sixth switching tube, so that the code returning driving module 6 outputs a second code returning signal to the incoming line terminal 1.

The detection end of the duplicate code detection unit 9 is connected to the collector of the sixth switching tube (SLC1_ ANSWER in the figure), and the output end of the duplicate code detection unit 9 is connected to the driving end of the duplicate code driving module 7. The coincident code detection unit 9 sends a coincident code driving signal to the driving end of the coincident code driving module 7 according to the voltage of the collector of the sixth switching tube, so that the coincident code driving module 7 outputs a second coincident code signal to the incoming line terminal 1.

Fig. 7 is a schematic circuit structure diagram of a loop code detection unit and an overlap code detection unit according to an embodiment of the present application, and fig. 7 is an enlarged schematic diagram of a loop code detection unit 8 and an overlap code detection unit 9 in fig. 2. As shown in fig. 2, 6 and 7, the echo detecting unit 8 includes a first comparator (U2A in the figure) and a first inverter (U3A in the figure), wherein the first inverter is a schmitt inverter. The non-inverting input end of the first comparator is connected to the collector (SLC1_ ANSWER) of the sixth switching tube, the inverting input end of the first comparator is connected to the 21.2V code-returning detection voltage source, the output end of the first comparator is connected to the input end of the first inverter, and the output end (FB _ NORMAL) of the first inverter is connected to the driving end of the code-returning driving module 6.

Further, the duplicate detection unit 9 includes a second comparator (U2B in the figure) and a second inverter (U3C in the figure), wherein the second inverter is a schmitt inverter. The non-inverting input end of the second comparator is connected to the collector (SLC1_ ANSWER) of the sixth switching tube, the inverting input end of the second comparator is connected to the 15.6V double code detection voltage source, the output end of the second comparator is connected to the input end of the second inverter, and the output end (FB _ REPEAT) of the second inverter is connected to the driving end of the double code driving module 7.

The sixth resistor is composed of two resistors which are connected in parallel and have resistance values of 240 Ω, the resistance value of the sixth resistor is 120 Ω, a voltage source connected with the sixth resistor is a 24V voltage source, and if the first echo signal received by the two bus signal repeaters is obtained by drawing current from a constant current source of 50mA in the field module or the probe, when the first echo signal is detected, the divided voltage of the sixth resistor is 50mA × 120 Ω ═ 6V, and the voltage of the collector of the sixth switching tube is 24V-6V ═ 18V. Assuming that the first duplicate code signal received by the two-bus signal repeater is a current of 100mA when the duplicate code occurs, and the divided voltage of the sixth resistor is 12V at this time, the voltage of the collector of the sixth switch tube is 12V.

Generally, the DLIP protocol (two-bus protocol) specifies a minimum value of 35mA for loop current (in this embodiment, the minimum loop current is 21.25mA for example), and determines that the loop current is a double code when the loop current is greater than 70 mA. When the coincident code appears, the code return current is more than or equal to 70mA, and corresponds to the voltage V of the collector electrode of the sixth switching tube_{SLC1_ANSWER}And the voltage of the collector of the sixth switching tube is less than 15.6V, the occurrence of coincident codes or short circuit is judged, and the reverse input end of the second comparator is connected to a 15.6V voltage source to serve as a coincident code detection voltage source.

When the code returns normally, the code return current is more than or equal to 70mA at 21.25mA, and the voltage of the collector of the corresponding sixth switching tubeComprises the following steps: v is not more than 15.6V_{SLC1_ANSWER}The voltage of the collector of the sixth switching tube is between 15.6V and 21.45V, and the reverse input end of the first comparator is connected to a 21.2V voltage source as a code-returning detection voltage source.

It can be understood that, during normal code returning, the first comparator outputs a low level signal and outputs a high level code returning driving signal through the first inverter, and during code returning, the first comparator and the second comparator both output low level signals and output high level code returning driving signals and high level code returning driving signals through the first inverter respectively, and at the end of code returning, the bus current is close to 0 mA. The relationship between the code-returning state, the code-returning current, and the output voltages of the first and second comparators is shown in the following table:

code recovery state	Code current	V_{FB_NORMAL}	V_{FB_REPEAT}
				Code without return	I＜21.25mA	L	L
Normal return code	70mA＞I≥21.25mA	H	L
				Duplication code	I≥70mA	H	H

Fig. 8 is a schematic circuit structure diagram of a code feedback driving module according to an embodiment of the present disclosure, and fig. 8 is an enlarged schematic diagram of the code feedback driving module 6 in fig. 2. As shown in fig. 2, 7 and 8, the code-returning driving module 6 provided in this embodiment includes a seventh switching tube (Q6 in the figure), an eighth switching tube (Q9 in the figure), an eighth resistor (R22 in the figure) and a ninth resistor (R19 in the figure), and the seventh switching tube and the eighth switching tube are respectively provided with a control terminal, a first connection terminal and a second connection terminal. Specifically, the seventh switching tube and the eighth switching tube provided in this embodiment are NPN-type triodes, and the control end, the first connection end, and the second connection end of the seventh switching tube are a base, a collector, and an emitter, respectively.

Specifically, the base of the seventh switch tube is connected to the output end (FB _ NORMAL) of the first inverter, the collector of the seventh switch tube is connected to the positive input port of the inlet terminal 1 (the connection with the positive input port of the inlet terminal 1 is realized by connecting the second connection end of the first pin connector), the emitter of the seventh switch tube is grounded through the eighth resistor, the emitter of the seventh switch tube is further connected to the base of the eighth switch tube through the ninth resistor, the collector of the eighth switch tube is connected to the base of the seventh switch tube, and the emitter of the eighth switch tube is grounded.

When the first inverter outputs a high-level code returning driving signal, the seventh switch tube is turned on, and a current of 50mA is drawn from the two buses, so that a second code returning signal is output to the incoming line terminal 1.

The resistance value of the eighth resistor is 12.1 omega, the starting voltage of the eighth switch tube is 0.7V, the current flowing in the seventh switch tube is limited within the range of 0.7V/12.1 omega-57.85 mA, and when the current exceeds 57.85mA, the seventh switch tube is cut off, so that overcurrent protection of the line is realized.

Fig. 9 is a schematic circuit structure diagram of an recoding driving module according to an embodiment of the present application, and fig. 9 is an enlarged schematic diagram of the recoding driving module 7 in fig. 2. As shown in fig. 2, 7 and 9, the double code driving module 7 provided in this embodiment includes a ninth switching tube (Q7 in the figure), a tenth switching tube (Q10 in the figure), a tenth resistor (R23 in the figure) and an eleventh resistor (R20 in the figure), where the ninth switching tube and the tenth switching tube are both provided with a control terminal, a first connection terminal and a second connection terminal. Specifically, the ninth switching tube and the tenth switching tube provided in this embodiment are NPN-type triodes, and the control end, the first connection end, and the second connection end of the NPN-type triode are respectively a base, a collector, and an emitter.

Specifically, the base of the ninth switch tube is connected to the output end (FB _ REPEAT) of the second inverter, the collector of the ninth switch tube is connected to the positive input port of the line terminal 1 (the connection with the positive input port of the line terminal 1 is realized by connecting the second connection end of the first pin connector), the emitter of the ninth switch tube is grounded through the tenth resistor, the emitter of the ninth switch tube is further connected to the base of the tenth switch tube through the eleventh resistor, the collector of the tenth switch tube is connected to the base of the ninth switch tube, and the emitter of the tenth switch tube is grounded.

When the second inverter outputs a high-level coincident code driving signal, the first inverter outputs a high-level return code driving signal at this time, the sixth switching tube and the seventh switching tube are conducted, and a current of 100mA is drawn from the two buses, so that the second coincident code signal is output to the incoming line terminal 1.

The resistance value of the tenth resistor is 12.1 omega, the starting voltage of the tenth switching tube is 0.7V, the current flowing in the ninth switching tube is limited within the range of 0.7V/12.1 omega-57.85 mA, and when the current exceeds 57.85mA, the ninth switching tube is cut off, so that overcurrent protection of the line is realized.

Fig. 10 is a schematic circuit structure diagram of a short circuit detection unit according to an embodiment of the present disclosure, fig. 10 is an enlarged schematic circuit diagram of the short circuit detection unit 11 in fig. 2, fig. 11 is a schematic circuit structure diagram of a short circuit driving module according to an embodiment of the present disclosure, and fig. 11 is an enlarged schematic circuit diagram of the short circuit driving module 10 in fig. 2. As shown in fig. 2, 6, 10, and 11, the detection end of the short-circuit detection unit 11 provided in this embodiment is connected to the collector of the sixth switching tube, the output end of the short-circuit detection unit 11 is connected to the driving end of the short-circuit driving module 10, and the short-circuit detection unit 11 sends a short-circuit driving signal to the driving end of the short-circuit driving module 10 according to the voltage of the collector of the sixth switching tube, so that the short-circuit driving module 10 outputs a second short-circuit detection signal to the incoming line terminal 1.

Specifically, the short circuit detection unit 11 provided in this embodiment includes a third comparator (U2C in the figure) and a third inverter (U3B in the figure), where the third inverter is a schmitt inverter. The non-inverting input end of the third comparator is connected to the collector (SLC1_ ANSWER) of the sixth switching tube, the inverting input end of the third comparator is connected to a 10V short-circuit detection voltage source, the output end of the third comparator is connected to the input end of the third inverter, and the output end of the third inverter is connected to the control end of the short-circuit driving module 10.

Further, the short circuit driving module 10 provided in this embodiment includes an eleventh switching tube (Q5 in the figure), a twelfth switching tube (Q8 in the figure), a twelfth resistor (R21 in the figure), and a thirteenth resistor (R18 in the figure), where the eleventh switching tube and the twelfth switching tube are respectively provided with a control end, a first connection end, and a second connection end. Specifically, the eleventh switching tube and the twelfth switching tube provided in this embodiment are NPN-type triodes, and the control end, the first connection end, and the second connection end of the NPN-type triode are respectively a base, a collector, and an emitter.

Specifically, the base of the eleventh switch tube is connected to the output end of the third inverter, the collector of the eleventh switch tube is connected to the positive input port of the inlet terminal 1 (the connection with the positive input port of the inlet terminal 1 is realized by connecting the second connection end of the first pin connector), the emitter of the eleventh switch tube is connected to the positive output port (OUT +, which is equivalent to ground when in short circuit) of the outlet terminal 2 through the twelfth resistor, the emitter of the eleventh switch tube is further connected to the base of the twelfth switch tube through the thirteenth resistor, the collector of the twelfth switch tube is connected to the base of the eleventh switch tube, and the emitter of the twelfth switch tube is connected to the positive output port (OUT +) of the outlet terminal 2.

It will be appreciated that in two bus signal repeatersWhen the outlet terminal 2 is short-circuited, the short-circuit current is assumed to be 150mA, corresponding to the voltage V of the collector of the sixth switching tube_{SLC1_ANSWER}When 24V-150mA, 120 Ω, 6V, the third comparator outputs a low level signal and outputs a high level short circuit driving signal through the third inverter, the eleventh switch is turned on, and 150mA of current is drawn from the two buses, thereby outputting a second short circuit detection signal to the incoming line terminal 1. The second bus controller at the upper level can identify the code return signal, the repeated code signal and the short circuit detection signal according to the current value range corresponding to the current drawn by the field module or the probe.

The resistance value of the twelfth resistor is 4.02 omega, the starting voltage of the twelfth switch tube is 0.7V, the current flowing in the eleventh switch tube is limited within the range of 0.7V/4.02 omega to 174mA, and when the current exceeds 174mA, the eleventh switch tube is cut off, so that overcurrent protection of the line is realized.

Further, with reference to fig. 6 and fig. 11, the detection end of the short circuit detection module 13 provided in this embodiment is connected to the positive output port of the outgoing line terminal 2, the output end of the short circuit detection module 13 is connected to the driving end of the short circuit driving module 10, and the short circuit detection module 13 is configured to detect a code-back current signal received by the outgoing line terminal 2, and control the short circuit driving module 10 to output a second short circuit detection signal to the incoming line terminal 1 based on the code-back current signal.

Specifically, the short circuit detection module 13 includes a fuse (PTC 1 in the figure), a fifteenth resistor (R37 in the figure), a sixteenth resistor (R37 in the figure), and a short circuit indication LED lamp (LED 2 in the figure), wherein the fuse is a self-restoring fuse. Specifically, one end of the fuse is connected to the emitter of the sixth switching tube, the other end of the fuse is connected to the positive output port (SLC +) of the outlet terminal 2, one end of the fifteenth resistor is connected to the emitter of the sixth switching tube, the other end of the fifteenth resistor is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to the anode of the short-circuit indication LED lamp, the cathode of the short-circuit indication LED lamp is connected to the positive output port (SLC +) of the outlet terminal 2, and the common connection end of the fifteenth resistor and the sixteenth resistor is connected to the driving end of the short-circuit driving module 10 (i.e., the base. Other circuit connection relationships of this embodiment are detailed in the accompanying drawings, and this embodiment is not described again.

In the code returning process, if a short circuit occurs, the fuse is disconnected, current is supplied to the field module and the probe in the next two buses through the fifteenth resistor, the sixteenth resistor and the short circuit indication LED lamp, the short circuit indication LED lamp is turned on to perform short circuit indication, the eleventh switch tube is turned on at the moment, 150mA current is drawn from the two buses, and therefore a second short circuit detection signal is output to the incoming line terminal 1.

Fig. 12 is a schematic diagram of a two-bus communication system according to an embodiment of the present disclosure, as shown in fig. 12, for example, in a fire equipment communication system based on two buses for communication, two buses are led out through a fire alarm controller, and at a position (for example, within 1 Km) where the two buses need to be relayed and extended, an incoming terminal 1 of a two-bus signal repeater is connected to the two buses in the previous section, and an outgoing terminal 2 is connected to the two buses in the next section, so as to perform serial connection of the two buses, and a field module and a probe can be connected to each of the two buses in each section.

Meanwhile, a first code sending signal sent by the previous section of the second bus is received from the incoming line terminal 1 through the code sending receiving module 3, the code sending driving module 4 is controlled to output a second code sending signal with a corresponding level grade to the outgoing line terminal 2 according to the level grade of the first code sending signal, so that the second code sending signal is sent to the next section of the second bus, the first code returning signal and the first code repeating signal uploaded by the next section of the second bus are detected through the code returning detection module 5, and the code returning driving module 6 and the code repeating driving module 7 are controlled to send the second code returning signal and the second code repeating signal to the incoming line terminal 1 respectively based on the first code returning signal and the first code repeating signal, so that the second code returning signal and the second code repeating signal are sent to the previous section of the second bus, and the communication distance of the second bus and the load carrying capacity are effectively improved. Meanwhile, the short circuit condition of the field module or the load is detected and fed back to a superior control system in time, so that the safe operation of the equipment is ensured.

The foregoing is considered as illustrative of the preferred embodiments of the invention and the technical principles employed. The present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. The utility model provides a two bus relay return code circuits, is applied to two bus signal repeaters, two bus signal repeaters include incoming line terminal and outgoing lines terminal, its characterized in that, including returning a yard detection module, returning a yard drive module and coincident code drive module, wherein:

2. The two-bus relay code returning circuit according to claim 1, wherein the code returning detection module comprises a sixth resistor, a sixth switching tube, a seventh resistor, a second diode, a code returning detection unit and a duplicate code detection unit, the sixth switching tube is provided with a control end, a first connection end and a second connection end, wherein:

3. The two-bus relay loop code circuit according to claim 2, wherein the loop code detection unit includes a first comparator and a first inverter, a non-inverting input terminal of the first comparator is connected to the first connection terminal of the sixth switch tube, an inverting input terminal of the first comparator is connected to the loop code detection voltage source, an output terminal of the first comparator is connected to an input terminal of the first inverter, and an output terminal of the first inverter is connected to the driving terminal of the loop code driving module.

4. The two-bus relay code-returning circuit according to claim 3, wherein the code-returning driving module comprises a seventh switch tube, an eighth resistor and a ninth resistor, the seventh switch tube and the eighth switch tube are provided with a control end, a first connection end and a second connection end, wherein:

5. The two-bus repeater according to claim 4, wherein the resistance of the eighth resistor is 12.1 Ω, and the turn-on voltage of the eighth switch tube is 0.7V.

6. The two-bus relay loop code circuit according to claim 4, wherein the sixth resistor comprises two resistors which are connected in parallel and have a resistance of 240 Ω, the voltage source connected to the sixth resistor is a 24V voltage source, and the loop code detection voltage source is a 21.2V voltage source.

7. The two-bus relay loop code circuit according to claim 2, wherein the duplicate code detection unit includes a second comparator and a second inverter, a non-inverting input terminal of the second comparator is connected to the first connection terminal of the sixth switching tube, an inverting input terminal of the second comparator is connected to the duplicate code detection voltage source, an output terminal of the second comparator is connected to an input terminal of the second inverter, and an output terminal of the second inverter is connected to the driving terminal of the duplicate code driving module.

8. The two-bus relay loop code circuit according to claim 7, wherein the duplicate code driving module includes a ninth switching tube, a tenth resistor and an eleventh resistor, and the ninth switching tube and the tenth switching tube are each provided with a control end, a first connection end and a second connection end, wherein:

9. The two-bus repeater according to claim 8, wherein the tenth resistor has a resistance of 12.1 Ω, and the tenth switch tube has a turn-on voltage of 0.7V.

10. The two-bus relay loop code circuit according to claim 9, wherein the sixth resistor is composed of two resistors connected in parallel and each having a resistance of 240 Ω, the voltage source connected to the sixth resistor is a 24V voltage source, and the loop code detection voltage source is a 15.6V voltage source.