CN204539134U - Signal strengthens equipment and RS-485 communication system - Google Patents
Signal strengthens equipment and RS-485 communication system Download PDFInfo
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- CN204539134U CN204539134U CN201520058619.8U CN201520058619U CN204539134U CN 204539134 U CN204539134 U CN 204539134U CN 201520058619 U CN201520058619 U CN 201520058619U CN 204539134 U CN204539134 U CN 204539134U
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- 238000002347 injection Methods 0.000 description 4
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Abstract
The utility model provides a kind of signal be applied in RS-485 communication system and strengthens equipment, and described signal strengthens equipment and comprises: pull-up circuit, pull-down circuit, rectification circuit and accumulator; Described pull-up circuit holds with the A of described RS-485 communication bus respectively and described accumulator is connected; Described pull-down circuit holds with the B of described RS-485 communication bus respectively and described accumulator is connected; Described rectification circuit is held with the A of described RS-485 communication bus respectively, B holds and described accumulator is connected; Described RS-485 communication bus can be charged to described accumulator by described rectification circuit; Described accumulator can by described pull-up circuit and pull-down circuit to described RS-485 communication bus input current.The utility model improves the communication capacity of RS-485 communication bus.
Description
Technical field
The utility model belongs to circuit engineering field, and particularly a kind of signal be applied in RS-485 communication system strengthens equipment and RS-485 communication system.
Background technology
RS-485 is a kind of serial communication link layer protocol transmitted based on differential signal, is widely used in the application such as automobile, electronic telecommunication equipment, local area network (LAN), cellular basestation and Industry Control instrument and meter.In RS-485 communication system, generally take two-wire system, master slave communication mode, the mode of connection adopts bus type topological structure usually, bus can access multiple communication node, and described communication node is connected in series on RS-485 communication bus, is communicated by RS-485 communication bus.
But, thisly take two-wire system, the RS-485 communication system of master slave communication mode, when the communication node accessed on communication bus is too much, bus cable, by long, can bring more resistance consumption, make can not provide enough drive currents in communication process, cause communication failure.
Utility model content
In view of this, this application provides a kind of signal be applied in RS-485 communication system and strengthen equipment and RS-485 communication system, for communication node provides drive current, reduce communication failure.
For achieving the above object, the application provides following technical scheme:
First aspect, provide a kind of signal be applied in RS-485 communication system and strengthen equipment, described communication system comprises the multiple RS-485 communication nodes be connected on RS-485 communication bus, described RS-485 communication bus adopts Double wire transmission, each RS-485 communication node is connected to A end and the B end of described RS-485 communication bus respectively, and described signal strengthens equipment and comprises:
Pull-up circuit, pull-down circuit, rectification circuit and accumulator;
Described pull-up circuit holds with the A of described RS-485 communication bus respectively and described accumulator is connected;
Described pull-down circuit holds with the B of described RS-485 communication bus respectively and described accumulator is connected;
Described rectification circuit is held with the A of described RS-485 communication bus respectively, the B of described RS-485 communication bus holds and described accumulator is connected;
Described RS-485 communication bus can be charged to described accumulator by described rectification circuit; Described accumulator can by described pull-up circuit and pull-down circuit to described RS-485 communication bus output current.
Preferably, described rectification circuit comprises the first diode and the second diode;
Described first diodes in parallel is at the two ends of described pull-up circuit;
The positive pole of described first diode is held with the A of described RS-485 communication bus and is connected;
Described second diodes in parallel is at the two ends of described pull-down circuit;
The negative pole of described second diode is held with the B of described RS-485 communication bus and is connected.
Preferably, described rectification circuit comprises the first diode, the second diode, the 3rd diode and the 4th diode;
The positive pole of described first diode holds with the A of described RS-485 communication bus respectively and the negative pole of described 3rd diode is connected, and negative pole is connected with the first end of described accumulator;
The described positive pole of the 3rd diode is connected with the second end of described accumulator;
The positive pole of described second diode is connected with the second end of described accumulator, and negative pole holds with the B of described RS-485 communication bus respectively and the positive pole of described 4th diode is connected;
The negative pole of described 4th diode is connected with the first end of described accumulator;
Wherein, described pull-up circuit is held with the first end of described accumulator and the A of described RS-485 communication bus respectively and is connected;
Described pull-down circuit is held with the second end of described accumulator and the B of described RS-485 communication bus respectively and is connected.
Preferably, described accumulator is made up of N number of electric capacity be connected in series, wherein, N be more than or equal to 1 integer.
Preferably, described pull-up circuit is the first resistance, and described pull-down circuit is the second resistance.
Preferably, described first resistance and described second resistance are respectively 1 kilo-ohm.
Preferably, the capacitance of described electric capacity is 1 microfarad.
Second aspect, provides a kind of RS-485 communication system, comprises being connected to multiple RS-485 communication node on RS-485 communication bus and signal described above strengthens equipment.
Known via above-mentioned technical scheme, compared with prior art, this application provides a kind of signal be applied in RS-485 communication system and strengthen equipment and RS-485 communication system, described signal strengthens equipment connection on RS-485 communication bus, comprise pull-up circuit, pull-down circuit, rectification circuit and accumulator, RS-485 communication bus can be charged to accumulator by rectification circuit; Accumulator can by pull-up circuit and pull-down circuit to RS-485 communication bus output current, and therefore strengthening equipment by described signal can provide drive current to RS-485 communication bus, thus improves the communication capacity of RS-485 communication bus.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
A kind of schematic diagram of the RS-485 system communication bus that Fig. 1 provides for the utility model embodiment;
A kind of structural representation of enhancing equipment be applied in RS-485 communication system signal that Fig. 2 provides for the utility model embodiment;
The another kind of structural representation being applied to the signal enhancing equipment in RS-485 communication system that Fig. 3 provides for the utility model embodiment;
Another structural representation being applied to the signal enhancing equipment in RS-485 communication system that Fig. 4 provides for the utility model embodiment;
Another structural representation being applied to the signal enhancing equipment in RS-485 communication system that Fig. 5 provides for the utility model embodiment;
Another structural representation being applied to the signal enhancing equipment in RS-485 communication system that Fig. 6 provides for the utility model embodiment;
Another structural representation being applied to the signal enhancing equipment in RS-485 communication system that Fig. 7 provides for the utility model embodiment;
Another structural representation being applied to the signal enhancing equipment in RS-485 communication system that Fig. 8 provides for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiments provides a kind of signal be applied in RS-485 communication system and strengthens equipment, described RS-485 communication system comprises the multiple RS-485 communication nodes be connected on RS-485 communication bus, described RS-485 communication bus adopts Double wire transmission, and each RS-485 communication node is connected to A end and the B end of described RS-485 communication bus respectively.
As shown in Figure 1, figure center line A, B are A end and the B end of RS-485 communication bus, and each unit is each communication node, and general master unit 101 refers to main communication node, and subelement 102 refers to sub-communication node.
As shown in Figure 2, be the structural representation of a kind of signal enhancing equipment embodiment be applied in RS-485 communication system that the utility model embodiment provides, this signal strengthens equipment and can comprise:
Pull-up circuit 201, pull-down circuit 202, rectification circuit 203 and accumulator 204;
Pull-up circuit 201 holds with the A of RS-485 communication bus respectively and accumulator 204 is connected;
Pull-down circuit 202 holds with the B of RS-485 communication bus respectively and accumulator 204 is connected;
Rectification circuit 203 is held with the A of RS-485 communication bus respectively, the B of RS-485 communication bus holds and described accumulator 204 is connected;
RS-485 communication bus can be charged to accumulator 204 by rectification circuit 203; Accumulator 204 can by pull-up circuit 201 and pull-down circuit 202 to RS-485 communication bus input current.
The signal that what the utility model provided be applied in RS-485 communication system strengthens equipment, equipment itself does not comprise supply unit, by rectification circuit, RS-485 communication bus can charge to accumulator when fan-out capability is very strong, and at this moment RS-485 communication node may be in output state; When RS-485 communication bus fan-out capability is not enough, can to RS-485 communication bus Injection Current, to provide drive current.Therefore strengthen equipment by described signal and can provide drive current to RS-485 communication bus, effectively compensate for the problem that signal is decayed at communication node, thus improve the communication capacity of RS-485 communication bus.
RS-485 communication bus can be charged to accumulator 204 by rectification circuit 203, can comprise:
When any one RS-485 communication node is output state, can be charged to accumulator 204 by rectification circuit 203;
Any one RS-485 communication node be input state or high-impedance state time, can by pull-up circuit 201 and pull-down circuit 202 to 203 to RS-485 communication bus input currents.
Common rectifier system can adopt the circuit realiration with diode or triode, here a kind of rectification circuit is provided can to realize technique effect of the present utility model, also be realize a kind of tandem circuit that can realize this effect of the present utility model, as shown in Figure 3:
Rectification circuit comprises the first diode D1 and the second diode D2;
First diode D1 is connected in parallel on the two ends of described pull-up circuit 201;
The positive pole of the first diode D1 is held with the A of described RS-485 communication bus and is connected;
Second diode D2 is connected in parallel on the two ends of described pull-down circuit 202;
The negative pole of the second diode D2 is held with the B of described RS-485 communication bus and is connected.
In this rectification circuit, the described Position Design of two diodes is one stealing circuit cleverly, when RS-485 communication node output current is very capable, electric current is respectively by two diodes, energy storage can be realized to accumulator, when the communication signal transmissions ability of bus is more weak, the electric energy release that accumulator stores, electric current can inject RS-485 communication bus by upper pull-down circuit.
Signal described in Fig. 3 strengthens equipment, can be the pressure reduction of the B terminal voltage of voltage and the RS485 communication bus held at the A of RS485 communication bus, higher than the pressure drop sum of the charging circuit that accumulator and diode are formed, can be charged to accumulator by two diodes.
In another signal enhancing equipment as shown in Figure 4, provide the implementation that the another kind of rectification circuit is possible:
Rectification circuit comprises the 3rd diode D3 and the 4th diode D4;
The positive pole of the 3rd diode D3 is connected with the second end of accumulator; Negative pole is held with the A of RS-485 communication bus and is connected;
The negative pole of the 4th diode D4 is connected with the first end of accumulator; The B end that negative pole connects RS-485 communication bus connects.
Pull-up circuit 201 holds with the A of RS-485 communication bus respectively and the first end of accumulator 204 is connected;
Pull-down circuit 202 holds with the B of RS-485 communication bus respectively and the second end of accumulator 204 is connected;
When RS-485 communication node output current is very capable, electric current, respectively by two diodes, can realize energy storage to accumulator, when the communication signal transmissions ability of bus is more weak, the electric energy release that accumulator stores, electric current can inject RS-485 communication bus by upper pull-down circuit.
Signal described in Fig. 4 strengthens equipment, can be the pressure reduction of the A terminal voltage of voltage and the RS485 communication bus held at the B of RS485 communication bus, higher than the pressure drop sum of the charging circuit that accumulator and diode are formed, can be charged to accumulator by two diodes.
In order to realize better rectification effect, rectification circuit 203 can be designed to further:
As shown in Figure 5, rectification circuit 203 comprises the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4;
The positive pole of the first diode D1 holds with the A of described RS-485 communication bus respectively and the negative pole of described 3rd diode D3 is connected, and negative pole is connected with the first end of described accumulator 204;
The positive pole of the 3rd diode D3 is connected with the second end of described accumulator 204;
The positive pole of the second diode D2 is connected with the second end of described accumulator 204, and negative pole holds with the B of RS-485 communication bus respectively and the positive pole of described 4th diode D4 is connected;
The negative pole of the 4th diode is connected with the first end of described accumulator 204;
Wherein, the link of corresponding pull-up circuit 201 and pull-down circuit 202 and accumulator 201 also will relative to be designed to:
Pull-up circuit 201 is held with the first end of described accumulator 204 and the A of RS-485 communication bus respectively and is connected;
Pull-down circuit 202 is held with the second end of described accumulator 204 and the B of RS-485 communication bus respectively and is connected.
By the embodiment of Fig. 5, the rectification circuit of four diodes ensure that better on the one the second diode bases, can obtain better rectification effect, further ensure electric current under different output mode and have the flow direction determined.
Electric capacity is a kind of very effective accumulator in the circuit of this small components, and the characteristic of the discharge and recharge himself had very effectively can meet the charge-discharge power demand required for the utility model above-described embodiment, so, accumulator can be designed to be made up of electric capacity, but the design of accumulator also has other kinds of schemes according to other common technology means of this area, and being made up of electric capacity is only a kind of preferred version.
Further, accumulator can be made up of N number of electric capacity be connected in series, wherein, N be more than or equal to 1 integer.
In order to realize pull-up or drop-down function, ensureing at accumulator, when output is 1 output circuit, can ensure by the output clamper of accumulator in high level or low level, and play metering function, usually can adopt pull down resistor to realize.
Pull-up circuit in then above-mentioned equipment is the first resistance R1, and pull-down circuit is the second resistance R2.
Concrete, as shown in Figure 6, to be applied in the equipment as Fig. 3 by upper pull down resistor as upper pull-down circuit, this apparatus embodiments comprises:
First resistance R1 holds with the A of RS-485 communication bus respectively and accumulator is connected;
Second resistance R2 holds with the B of RS-485 communication bus respectively and accumulator is connected;
First diode D1 is connected in parallel on the two ends of described first resistance;
The positive pole of the first diode D1 is held with the A of described RS-485 communication bus and is connected;
Second diode D2 is connected in parallel on the two ends of described second resistance;
The negative pole of the second diode D2 is held with the B of described RS-485 communication bus and is connected.
When RS-485 communication bus fan-out capability is enough, due to the existence of the rectification circuit that the first and second diodes are formed, RS-485 communication bus can be charged to described accumulator by these two diodes; When RS-485 communication bus needs Injection Current, namely accumulator illustrates electric energy stored by electric capacity C1 by described first resistance and the second resistance to described RS-485 communication bus output current.
In previous embodiment, mention accumulator to be made up of electric capacity, so the accumulator in Fig. 5 has been reduced to the situation of an electric capacity C1, but it should be noted that, this kind of scheme is never only limitted at the satisfied accumulator realized needed for the utility model, illustrated scheme is just in order to clearly show this embodiment, and the accumulator of an electric capacity can replace with other the accumulator that can realize charge-discharge power demand herein.
As shown in Figure 7, to be applied in the equipment as Fig. 4 by upper pull down resistor as upper pull-down circuit, this apparatus embodiments comprises:
First resistance R1 holds with the A of RS-485 communication bus respectively and accumulator is connected;
Second resistance R2 holds with the B of RS-485 communication bus respectively and accumulator is connected;
Second end of the positive pole accumulator of the 3rd diode D3 connects; Negative pole is held with the A of RS-485 communication bus and is connected;
The negative pole of the 4th diode D4 is connected with the first end of accumulator, and negative pole is held with the B of RS-485 communication bus and is connected;
First resistance R1 holds with the A of RS-485 communication bus respectively and the first end of accumulator is connected;
Second resistance R2 holds with the B of RS-485 communication bus respectively and the second end of accumulator is connected.
In Fig. 7, accumulator is an electric capacity C1, and certain the utility model does not limit therewith.
As shown in Figure 8, to be applied in the equipment as Fig. 5 by upper pull down resistor as upper pull-down circuit, this equipment can comprise:
First resistance R1 holds with the first end of accumulator and the A of RS-485 communication bus respectively and is connected;
Second resistance R2 holds with the second end of accumulator and the B of RS-485 communication bus respectively and is connected.
The positive pole of the first diode D2 holds with the A of described RS-485 communication bus respectively and the negative pole of the 3rd diode is connected, and negative pole is connected with the first end of accumulator;
The positive pole of the 3rd diode D3 is connected with the second end of accumulator;
The positive pole of the second diode D3 is connected with the second end of accumulator, and negative pole holds with the B of RS-485 communication bus respectively and the positive pole of the 4th diode D4 is connected;
The negative pole of the 4th diode D4 is connected with the first end of accumulator.
When RS-485 communication bus fan-out capability is enough, due to the existence of the rectification circuit that four diodes are formed, namely RS-485 communication bus can be charged to described accumulator by this first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4.
The pressure reduction of the voltage that concrete can be holds at the A of RS485 communication bus and the B terminal voltage of RS485 communication bus, higher than the pressure drop sum of the charging circuit that accumulator and diode are formed, can be charged to accumulator by the first diode D1 and the second diode D2.
The pressure reduction of the voltage held at the B of RS485 communication bus and the A terminal voltage of RS485 communication bus, higher than the pressure drop sum of the charging circuit that accumulator and diode are formed, can be charged to accumulator by the 3rd diode D3 and the 4th diode D4.
When RS-485 bus requirements Injection Current, namely accumulator illustrates electric energy stored by electric capacity C1 by described first resistance R1 and the second resistance R2 to described RS-485 communication bus output current.
Pull-up circuit is the first resistance R1, be the second resistance R2 with pull-down circuit be only the result as a kind of signal, pull-up circuit and pull-down circuit being applied to Fig. 3 ~ Fig. 5, the program can be applied in the utility model in other embodiments, to other embodiments as further supplementing.
In addition; by resistance as realizing upper drop-down a kind of common approach level being carried out to the scheme of clamper; the pull-up circuit that the utility model provides is the first resistance; pull-down circuit is the second resistance is only a kind of comparatively easy preferred version that can realize drop-down effect; when not paying creative work; pull-up circuit and pull-down circuit in above-described embodiment of the present utility model are designed to other common scheme of this area, also should be considered as protection range of the present utility model.
For Fig. 6 ~ embodiment illustrated in fig. 8, concrete provides a kind of resistance data relying on experience and draw here, and general, the first resistance R1 and the second resistance R2 can be 1k Ω; The size of resistance here determines the ability of accumulator to communication bus Injection Current, and the size of 1k Ω is in the device, and can realize a kind of resistance that this equipment needs the technique effect realized, the resistance of R1, R2 also can be other effective resistance.
Equally, rely on empirically, be made up of N number of electric capacity be connected in series at above-mentioned accumulator, wherein the capacitance of electric capacity can for being 1 μ F, and 1 μ F here is also a kind of preferred version that can realize this utility model equipment effect for RS-485 communication system.
Equipment is strengthened for above-mentioned all signals, by it to be applied to RS-485 communication system, above-mentioned technique effect can be obtained, the communication capacity of this communication system can be significantly improved, other parts of RS-485 communication system with reference to prior art, no longer can be launched herein.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. the signal be applied in RS-485 communication system strengthens equipment, described communication system comprises the multiple RS-485 communication nodes be connected on RS-485 communication bus, described RS-485 communication bus adopts Double wire transmission, each RS-485 communication node is connected to A end and the B end of described RS-485 communication bus respectively, it is characterized in that, described signal strengthens equipment and comprises:
Pull-up circuit, pull-down circuit, rectification circuit and accumulator;
Described pull-up circuit holds with the A of described RS-485 communication bus respectively and described accumulator is connected;
Described pull-down circuit holds with the B of described RS-485 communication bus respectively and described accumulator is connected;
Described rectification circuit is held with the A of described RS-485 communication bus respectively, the B of described RS-485 communication bus holds and described accumulator is connected;
Described RS-485 communication bus can be charged to described accumulator by described rectification circuit; Described accumulator can by described pull-up circuit and pull-down circuit to described RS-485 communication bus output current.
2. equipment according to claim 1, is characterized in that, described rectification circuit comprises the first diode and the second diode;
Described first diodes in parallel is at the two ends of described pull-up circuit;
The positive pole of described first diode is held with the A of described RS-485 communication bus and is connected;
Described second diodes in parallel is at the two ends of described pull-down circuit;
The negative pole of described second diode is held with the B of described RS-485 communication bus and is connected.
3. equipment according to claim 1, is characterized in that, described rectification circuit comprises the first diode, the second diode, the 3rd diode and the 4th diode;
The positive pole of described first diode holds with the A of described RS-485 communication bus respectively and the negative pole of described 3rd diode is connected, and negative pole is connected with the first end of described accumulator;
The described positive pole of the 3rd diode is connected with the second end of described accumulator;
The positive pole of described second diode is connected with the second end of described accumulator, and negative pole holds with the B of described RS-485 communication bus respectively and the positive pole of described 4th diode is connected;
The negative pole of described 4th diode is connected with the first end of described accumulator;
Wherein, described pull-up circuit is held with the first end of described accumulator and the A of described RS-485 communication bus respectively and is connected;
Described pull-down circuit is held with the second end of described accumulator and the B of described RS-485 communication bus respectively and is connected.
4. the equipment according to any one of claims 1 to 3, is characterized in that, described accumulator is made up of N number of electric capacity be connected in series, wherein, N be more than or equal to 1 integer.
5. the equipment according to any one of claims 1 to 3, is characterized in that, described pull-up circuit is the first resistance, and described pull-down circuit is the second resistance.
6. equipment according to claim 5, is characterized in that, described first resistance and described second resistance are respectively 1 kilo-ohm.
7. equipment according to claim 4, is characterized in that, the capacitance of described electric capacity is 1 microfarad.
8. a RS-485 communication system, is characterized in that, comprises being connected to multiple RS-485 communication node on RS-485 communication bus and the signal as described in any one of claim 1 ~ 7 strengthens equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520058619.8U CN204539134U (en) | 2015-01-28 | 2015-01-28 | Signal strengthens equipment and RS-485 communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520058619.8U CN204539134U (en) | 2015-01-28 | 2015-01-28 | Signal strengthens equipment and RS-485 communication system |
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| Publication Number | Publication Date |
|---|---|
| CN204539134U true CN204539134U (en) | 2015-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520058619.8U Withdrawn - After Issue CN204539134U (en) | 2015-01-28 | 2015-01-28 | Signal strengthens equipment and RS-485 communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579419A (en) * | 2015-01-28 | 2015-04-29 | 国家电网公司 | Signal enhancement equipment applied to RS-485 communication system |
| CN109917842A (en) * | 2019-04-16 | 2019-06-21 | 卓捷创芯科技（深圳）有限公司 | A kind of metastable clamper feedback start-up circuit of elimination automatic biasing band-gap reference degeneracy |
-
2015
- 2015-01-28 CN CN201520058619.8U patent/CN204539134U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579419A (en) * | 2015-01-28 | 2015-04-29 | 国家电网公司 | Signal enhancement equipment applied to RS-485 communication system |
| CN104579419B (en) * | 2015-01-28 | 2017-05-24 | 国家电网公司 | Signal enhancement equipment and RS-485 communication system |
| CN109917842A (en) * | 2019-04-16 | 2019-06-21 | 卓捷创芯科技（深圳）有限公司 | A kind of metastable clamper feedback start-up circuit of elimination automatic biasing band-gap reference degeneracy |
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