A real-time impedance matching non-polarity two-bus fire telephone system

Abstract

A real-time impedance matching non-polarity two-bus fire telephone system comprises a fire telephone host and a fire telephone extension, wherein the fire telephone host is connected to the fire telephone extension via two buses, and the fire telephone extension further comprises a signal filtering impedance transformation module and an impedance matching transformation circuit module, wherein the signal filtering impedance transformation module and the impedance matching transformation circuit module are respectively connected to the two buses, and during the communication process between the fire telephone host and the fire telephone extension, the impedance matching transformation circuit module is used to collect the communication signal on the two buses and convert it into a level signal, and the signal filtering impedance transformation module obtains the converted level signal in real time and changes the load of the fire telephone extension according to the level signal, thereby realizing real-time impedance matching, so that interference voltages such as line reflection and space radiation are consumed on the converted load, and the reliability of communication is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fire telephones, in particular to a real-time impedance matching non-polarity two-bus fire telephone system. Background Art

[0002] The existing two-bus fire telephone system generally adopts carrier technology or carrier chip, and uses frequency division multiplexing to complete the calls and communications between the fire telephone host and the extension. The cost of this solution is relatively high, and in the actual engineering application environment, especially in the case of long-distance wiring and multiple extensions, it is easy to be affected by the interference of the line capacitance between twisted pair lines, space radiation, etc., which affects the stable operation of the system, making it difficult to realize long-distance communication calls between multiple telephones at a low cost.

[0003] Therefore, how to provide a fire telephone system with high communication reliability is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The embodiment of the present application provides a real-time impedance matching non-polarity two-bus fire telephone system, which aims to solve the problem of communication reliability of the existing fire telephone system.

[0005] In the first aspect, the present application provides a real-time impedance matching non-polarity two-bus fire telephone system, including a fire telephone host and a fire telephone extension. The fire telephone host is connected to the fire telephone extension via two buses. The fire telephone extension also includes a signal filtering impedance transformation module and an impedance matching transformation circuit module. The signal filtering impedance transformation module and the impedance matching transformation circuit module are respectively connected to the two buses.

[0006] In one embodiment, the fire telephone host includes a power supply MOS tube code sending module, a current sampling line monitoring module, a call and recording module and an automatic identification software processing module, and the power supply MOS tube code sending module, the current sampling line monitoring module, the call and recording module and the automatic identification software processing module are respectively connected to two buses.

[0007] In one embodiment, the fire telephone extension also includes a power protection code receiving circuit module, a call ringing module and a return code circuit software processing module, and the power protection code receiving circuit module, the call ringing module and the return code circuit software processing module are respectively connected to the two buses.

[0008] In one implementation, the impedance matching conversion circuit module includes a signal receiving level conversion submodule and a hardware filtering software code stream monitoring submodule, and the signal receiving level conversion submodule is connected to the hardware filtering software code stream monitoring submodule and the second bus respectively.

[0009] In one embodiment, the fire telephone extension also includes a single-chip microcomputer module, which is connected to the source protection code receiving circuit module, the call ringing calling module, the return code circuit software processing module and the impedance matching conversion circuit module through two buses.

[0010] The present application proposes a real-time impedance matching non-polarity two-bus fire telephone system. During the communication process between the fire telephone host and the fire telephone extension, the impedance matching transformation circuit module is used to collect the communication signal on the two buses and convert it into a level signal. The signal filtering impedance transformation module obtains the converted level signal in real time and changes the load of the fire telephone extension according to the level signal, thereby realizing real-time impedance matching, so that interference voltages such as line reflection and space radiation are consumed on the transformed load, thereby improving the reliability of communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 A framework diagram of an isolated DC bus bidirectional overcurrent protection circuit provided in an embodiment of the present application;

[0013] Figure 2 A schematic diagram of the fire telephone host provided in the embodiment of the present application;

[0014] Figure 3 A schematic diagram of the fire telephone extension provided in the embodiment of the present application;

[0015] Figure 4 A schematic diagram of the impedance matching conversion circuit module provided in an embodiment of the present application;

[0016] Description of main components and symbols:

[0017] 1. Fire telephone host; 2. Fire telephone extension; 11. Power supply MOS tube code sending module; 12. Current sampling line monitoring module; 13. Call and recording module; 14, 21. Signal filtering impedance transformation module; 22. Power protection receiving code circuit module; 23. Call ringing calling module; 24. Return code circuit software processing module; 25. Single chip computer module; 26. Impedance matching transformation circuit module; 261. Signal receiving level conversion submodule; 262. Hardware filtering software code stream monitoring submodule. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] See also Figure 1 The embodiment shows a framework structure diagram of a real-time impedance matching non-polarity two-bus fire telephone system, the system includes a fire telephone host 1 and a fire telephone extension 2, the fire telephone host 1 is connected to the fire telephone extension 2 via two buses, the fire telephone extension 2 also includes a signal filtering impedance transformation module 21 and an impedance matching transformation circuit module 26, the signal filtering impedance transformation module 21 and the impedance matching transformation circuit module 26 are respectively connected to the two buses, and are connected to each other via the two buses; when the fire telephone system is working, the level signal in the system is different during the call process and the non-call process, and during the operation of the fire telephone system, the impedance matching transformation circuit module 26 The high and low level signals on the two buses are acquired in real time, and the high and low level signals are converted to obtain level signals; when the fire telephone host 1 is converted from the dialing state to the normal state, or from the normal state to the dialing state, the level signal will also be converted between the high level and the low level accordingly, and the signal filtering impedance transformation module 21 will change the load of the fire telephone extension 2 in real time according to the change of the level signal, and connect the resistance load when the high level is converted to the low level, and disconnect the resistance load when the low level is converted to the high level, so that the interference voltage such as line reflection and space radiation is consumed on the transformed load, so as to realize real-time impedance matching and improve the reliability of communication.

[0020] Among them, the specific implementation process of real-time impedance matching is:

[0021] When the fire telephone host 1 sends a high level on the bus, the signal receiving circuit of the fire telephone extension 2 is in a high input impedance state; when the code level changes from a high level to a low level, due to factors such as a long bus line or multiple branches, the signal reflection forms a low-level oscillation signal. In order to curb the generation of the oscillation signal, the fire telephone extension 2 obtains the high and low level signals on the two buses by the impedance matching conversion circuit module 26, and converts the high and low level signals to obtain a level signal. After the signal filtering impedance conversion module 21 detects that the high level changes to a low level, it drives the transistor it manages to A resistive load is connected online to eliminate the interference of overcharge signals on normal signals; when the coding level changes from low level to high level, the resistive load is disconnected, and the receiving circuit of the fire telephone extension 2 is in a high input impedance state. The high-level overcharge signal is absorbed by the overvoltage circuit (such as TVS tube, overvoltage protection capacitor, etc.) of the fire telephone extension 2, and does not affect the normal signal reception, thereby realizing real-time impedance matching changes. The fire telephone extension 2 can communicate stably and reliably with the fire telephone host 1 under low receiving power, so that more fire telephone extensions 2 can be connected to the bus line.

[0022] In one embodiment, when multiple fire telephone extensions 2 are connected to the system, in the case of multiple branches and long-distance communication, the line reflection and space radiation signals are large. During the communication process, due to the influence of the rectifier circuit, only high-level and low-level positive overcharge signals of the bus will be formed. The high-level superimposed interference components are absorbed by the overvoltage circuit (such as TVS tube, overvoltage protection capacitor, etc.) of the fire telephone extension 2, and the low-level superimposed interference components are absorbed by the connected resistance load of each branch fire telephone extension 2. At the same time, the fire telephone extension 2 software will calculate the low-level enable time according to the code receiving situation, which will not affect the triggering of the next high-level signal.

[0023] In one embodiment, there may be multiple fire telephone extensions 2, and the multiple fire telephone extensions 2 are all connected to the fire telephone host 1 via two buses.

[0024] In one embodiment, two buses are used to realize the connection between the fire telephone host 1 and the fire telephone extension 2, so that communication and power supply use one bus, which is not only low-cost but also simple in wiring.

[0025] See also Figure 2 The framework diagram of the fire telephone host shown in the embodiment,

[0026] The fire telephone host 1 includes a power supply MOS tube code sending module 11, a current sampling line monitoring module 12, a call and recording module 13 and an automatic identification software processing module 14. The power supply MOS tube code sending module 11, the current sampling line monitoring module 12, the call and recording module 13 and the automatic identification software processing module 14 are respectively connected to two buses, wherein:

[0027] The call and recording module 13 is used to receive communication signals such as call signals or recording signals;

[0028] The power supply MOS tube code sending module 11 is used to convert the communication signal of the fire telephone host 1 into a high-low level signal, and send it to the fire telephone extension 2 through the second bus;

[0029] The current sampling line monitoring module 12 is used to sample the high and low level signals fed back by the fire telephone extension 2 on the second bus;

[0030] The automatic identification software processing module 14 is used to obtain the return code energy of the fire telephone extension 2 that matches the code signal of the fire telephone host 1 according to the current signal size and sampling time of the sampling signal, so as to judge the current state of the fire telephone extension 2 to determine whether the fire telephone extension 2 is off the hook, whether it is on a call, or whether the address coding is normal, etc.

[0031] In one embodiment, the power supply MOS tube code sending module 11 uses a high-performance MOS tube to transmit communication signals, which not only has a low cost, but also can reduce the signal transmission time and improve the communication speed.

[0032] In one embodiment, if there are multiple fire telephone extensions 2 with the same address in the system, when the fire telephone host 1 sends an inspection command through the power supply MOS tube code sending module 11, multiple extensions return codes at the same time. The host monitors the abnormal return code energy of the address extension through the current sampling line monitoring module 12, and it can be determined that there is a duplicate code at the address, and a duplicate code fault is reported. After the duplicate code extension is released, the return code energy of the address extension is normal, and the duplicate code fault disappears.

[0033] See also Figure 3 The frame structure diagram of the fire telephone extension shown in the embodiment,

[0034] The fire telephone extension 2 includes a signal filtering impedance conversion module 21, a power protection code receiving circuit module 22, a call ringing calling module 23, a return code circuit software processing module 24 and an impedance matching conversion circuit module 26. The signal filtering impedance conversion module 21, the power protection code receiving circuit module 22, the call ringing calling module 23, the return code circuit software processing module 24 and the impedance matching conversion circuit module 26 are respectively connected to two buses, wherein:

[0035] The power protection code receiving circuit module 22 is used to obtain the high and low level signals on the second bus;

[0036] The signal filtering impedance transformation module 21 is used to perform software filtering processing on the acquired high and low level signals;

[0037] The call ringing calling module 23 is used to send the call information of the fire telephone extension 2, and is also used to ring the reminder when receiving the call information of the fire telephone host 1;

[0038] The return code circuit software processing module 24 is used to convert the status information of the fire telephone extension 2 into return code information;

[0039] The impedance matching conversion circuit module 26 is used to perform hardware filtering processing on the acquired high and low level signals, and perform level conversion on the high and low level signals after the filtering processing to obtain level information;

[0040] The signal filtering impedance transformation module 21 is also used to change the current load of the fire telephone extension 2 in real time according to the level information, so as to achieve real-time impedance matching.

[0041] In one embodiment, the fire telephone extension 2 also includes a single-chip microcomputer module 25, which is respectively connected to the signal filtering impedance transformation module 21, the power protection code receiving circuit module 22, the call ringing calling module 23, the return code circuit software processing module 24 and the impedance matching transformation circuit module 26, and is used to adjust the operation and coordination of each module of the fire telephone extension 2.

[0042] In one embodiment, the impedance matching conversion circuit module 26 further includes a signal receiving level conversion submodule 261 and a hardware filtering software code stream monitoring submodule 262, and the signal receiving level conversion submodule 261 is connected to the hardware filtering software code stream monitoring submodule 262 and the second bus, wherein

[0043] The signal receiving level conversion submodule 261 is used to collect high and low level signals on the second bus, and perform level conversion on the high and low level signals;

[0044] The hardware filtering software code stream monitoring submodule 262 is used to filter high and low level signals, and monitor high and low level signals on the second bus;

[0045] After the signal receiving level conversion submodule 261 collects the high and low level signals, the high and low level signals are sent to the hardware filtering software code stream monitoring submodule 262. The hardware filtering software code stream monitoring submodule 262 monitors and hardware filters the high and low level signals, and returns the filtered high and low level signals to the signal receiving level conversion submodule 261. The signal receiving level conversion submodule 261 converts the filtered high and low level signals, and sends the converted level signals to the single-chip module 25. The single-chip module 25 then sends the level information to the signal filtering impedance transformation module 21, and changes the load of the fire telephone extension 2 through the signal filtering impedance transformation module 21.

[0046] In one embodiment, the fire telephone host 1 supplies power to the fire telephone extension 2 in real time and sends call, inspection, conversation, hang-up and other information through the power supply MOS tube code sending module 11; after the fire telephone extension 2 receives the information, it responds to the host information through the return code circuit software processing module 24, and at the same time controls each module through the single-chip computer module 25 to complete the system function.

[0047] In one embodiment, the fire telephone host 1 also includes an address coding module. The address of each fire telephone extension 2 is stored in the flash chip in the extension single-chip computer module 25. The fire telephone extension 2 is connected to the coding interface corresponding to the fire telephone host 1. The user operates the host and sends a coding command, and the address of the fire telephone extension 2 can be encoded through the second bus.

[0048] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present application, and still fall within the scope of protection of the present application.

Claims

1. A real-time impedance matching non-polarity two-bus fire telephone system, characterized in that: It includes a fire telephone host and a fire telephone extension. The fire telephone host is connected to the fire telephone extension through two buses. The fire telephone extension also includes a signal filtering impedance transformation module and an impedance matching transformation circuit module. The signal filtering impedance transformation module and the impedance matching transformation circuit module are respectively connected to the two buses; the impedance matching transformation circuit module is used to obtain high and low level signals on the two buses, and perform level conversion on the high and low level signals to obtain level signals; the signal filtering impedance transformation module is used to drive the transistor managed by the signal filtering impedance transformation module to connect the resistive load on the bus after detecting that the high level signal becomes a low level; the signal filtering impedance transformation module is also used to disconnect the resistive load when the low level is converted to a high level, and the receiving circuit of the fire telephone extension is in a high input impedance state, and the high level overcharge signal is absorbed by the overvoltage circuit of the fire telephone extension.

2. A real-time impedance matching non-polarity two-bus fire telephone system as claimed in claim 1, characterized in that: The fire telephone host includes a power supply MOS tube code sending module, a current sampling line monitoring module, a call and recording module and an automatic identification software processing module, and the power supply MOS tube code sending module, the current sampling line monitoring module, the call and recording module and the automatic identification software processing module are respectively connected to the two buses; the call and recording module is used to receive the communication signal of the call signal or the recording signal; the power supply MOS tube code sending module is used to convert the communication signal of the fire telephone host into a high and low level signal, and send it to the fire telephone extension through the two buses; the current sampling line monitoring module is used to sample the high and low level signals fed back by the fire telephone extension on the two buses; the automatic identification software processing module is used to obtain the return code energy of the fire telephone extension that matches the code sending signal of the fire telephone host according to the current signal size and sampling time of the sampling signal.

3. A real-time impedance matching non-polarity two-bus fire telephone system as claimed in claim 1, characterized in that: The fire telephone extension also includes a power protection code receiving circuit module, a call ringing module and a return code circuit software processing module, and the power protection code receiving circuit module, the call ringing module and the return code circuit software processing module are respectively connected to the two buses; the power protection code receiving circuit module is used to obtain the high and low level signals on the two buses; the call ringing module is used to send the call information of the fire telephone extension, and is also used to ring and remind when receiving the call information of the fire telephone host; the return code circuit software processing module is used to convert the status information of the fire telephone extension into return code information.

4. A real-time impedance matching non-polarity two-bus fire telephone system as claimed in claim 3, characterized in that: The impedance matching conversion circuit module includes a signal receiving level conversion submodule and a hardware filtering software code stream monitoring submodule, wherein the signal receiving level conversion submodule is connected to the hardware filtering software code stream monitoring submodule and the second bus respectively; the signal receiving level conversion submodule is used to collect high and low level signals on the second bus, and perform level conversion on the high and low level signals; The hardware filtering software code stream monitoring submodule is used to filter high and low level signals, and monitor high and low level signals on the second bus.

5. A real-time impedance matching non-polarity two-bus fire telephone system as claimed in claim 3, characterized in that: The fire telephone extension also includes a single-chip microcomputer module, which is connected to a signal filtering impedance transformation module, a power protection code receiving circuit module, a call ringing calling module, a return code circuit software processing module and an impedance matching transformation circuit module through two buses; the single-chip microcomputer module is used to adjust the operation and coordination of each module of the fire telephone extension.

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