CN103457579B - Weak electric signal treatment system - Google Patents
Weak electric signal treatment system Download PDFInfo
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- CN103457579B CN103457579B CN201310362044.4A CN201310362044A CN103457579B CN 103457579 B CN103457579 B CN 103457579B CN 201310362044 A CN201310362044 A CN 201310362044A CN 103457579 B CN103457579 B CN 103457579B
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Abstract
Invention describes a kind of weak electric signal treatment system, comprise information source, signal conversion processing circuit and signal output module, wherein signal conversion processing circuit obtains the signal of information source, and be converted to the first signal, the two composition signal input module, signal output module exports final signal, and it is characterized in that: also comprise power circuit, this power circuit provides independent current source through the first isolated gate respectively to described signal input module and signal output module; The first signal that described signal input module exports passes to described signal output module through signal isolation circuit.Its remarkable result is: security performance is high, have employed two isolation modules and power supply input, signal input and signal output are isolated into three parts, the safe transmission of power supply and signal can be ensured, prevent equipment crosstalk and cause the security incident of information source end to occur, and power supply supply is convenient, installation cost is low, avoids the trouble customizing separately safety power supply.
Description
Technical field
The present invention relates to a kind of electronic circuit, specifically, is a kind of for the weak electric signal treatment system in industrial detection equipment.
Background technology
Along with the development of electronic technology, high density, high-performance, low cost, low-power consumption have become the trend that circuit design is pursued.And at present in industrial detection equipment, various detection signal usually adopts transducer to extract, and the signal detected is very faint, often need to carry out signal amplification and signal shaping just can be supplied to subsequent conditioning circuit or equipment use through special treatment circuit.Existing various transducer and signal processing circuit often adopt active device, need independent current source to power to it, and the installation of equipment and Application comparison trouble, power supply cost is higher.And for some special screnes, the security performance of power supply is also not being met.
Summary of the invention
For deficiency of the prior art, main purpose of the present invention is to provide a kind of weak electric signal treatment system, forward end sensor device is exported and corresponding signal processing circuit provides power supply by the power supply of rear end equipment, both simplify the cost of power-supply device, ensure again the Secure isolation of front end information source.
For achieving the above object, the technical solution adopted in the present invention is as follows:
A kind of weak electric signal treatment system, comprise information source, signal conversion processing circuit and signal output module, wherein signal conversion processing circuit obtains the signal of information source, and be converted to the first signal, the two composition signal input module, signal output module exports final signal, and its key is: also comprise power circuit, and this power circuit provides independent current source through the first isolated gate respectively to described signal input module and signal output module;
The first signal that described signal input module exports passes to described signal output module through signal isolation circuit.
Signal input module and the Secure isolation between signal output module and power circuit can be realized by the first isolated gate, the Secure isolation between signal input module and signal output module can be realized by signal isolation circuit, can ensure that information source works under being in a security context, the power supply that can make full use of again rear end equipment exports as front end information source and corresponding signal processing circuit are powered, simplify installation and the configuration of power-supply device, reduce system cost.
As further describing, described power circuit comprises direct-current voltage reducing circuit, this direct-current voltage reducing circuit sends low-voltage DC to inverter, this inverter is connected with the power input group of described first isolated gate, first power output end group of the first isolated gate is connected with described signal input module, and the second source output group of the first isolated gate is connected with described signal output module.
Usual rear end equipment power supply exports as DC power supply, in order to meet the demand of front end information source and respective handling circuit, realize the power delivery on the first isolated gate, therefore first adopt direct-current voltage reducing circuit adjustment to carry out step-down process, direct current input is converted to exchange and exports by recycling inverter power circuit.
Further describe again, first power output end group of described first isolated gate is connected with described signal input module after signal input module power supply circuits again, and the second source output group of described first isolated gate is connected with described signal output module after signal output module power supply circuits again.Because the power supply signal picked up from the first isolated gate is relatively weak AC signal, signalization input module power supply circuits and signal output module power supply circuits are therefore also needed to process it.
Under normal circumstances, in described signal input module power supply circuits and signal output module power supply circuits, include the voltage doubling rectifing circuit of two diodes and two electric capacity compositions, thus meet information source and other signal processing circuits to the demand of power supply.
And in order to realize the demand of signal isolation, described signal isolation circuit is made up of antecedent basis signaling conversion circuit, rearmounted basis signal change-over circuit and the second isolated gate;
Wherein antecedent basis signaling conversion circuit obtains described first signal, and antecedent basis signaling conversion circuit exports secondary signal and passes to described rearmounted basis signal change-over circuit through described second isolated gate;
Rearmounted basis signal change-over circuit exports the 3rd signal to described signal output module.
As preferably, described antecedent basis signaling conversion circuit and rearmounted basis signal change-over circuit include operational amplifier A 1, resistance R1, R3, R5, R6, R7, R8, R9, electric capacity C1, C2, C3 and voltage stabilizing didoe D1, wherein:
One end of resistance R1 is connected to positive electrode input, and the other end of resistance R1 is connected with negative electrode input through voltage stabilizing didoe D1;
The other end of resistance R1 is also connected with one end of resistance R3, the other end of described resistance R3 is connected with one end of resistance R5, the other end of resistance R5 is connected with negative electrode output, the other end of described resistance R5 is also connected with one end of resistance R6, and the other end of resistance R6 is connected with described negative electrode input;
The in-phase input end of described operational amplifier A 1 is connected between resistance R3 and resistance R5; The inverting input of operational amplifier A 1 is connected with negative electrode output through resistance R7, operational amplifier A 1 inverting input is also connected with the output of operational amplifier A 1 through resistance R8, and the output of operational amplifier A 1 is connected with positive electrode output by resistance R9;
Described electric capacity C2 is connected between described positive electrode output and negative electrode output;
Described electric capacity C3 is connected at the two ends of resistance R8.
The present invention has following beneficial effect:
1, security performance is high: weak electric signal treatment system of the present invention have employed two isolation modules and power supply input, signal input and signal output are isolated into three parts, the safe transmission of power supply and signal can be ensured, prevent equipment crosstalk and cause the security incident of information source end to occur.
2, power supply supply is convenient, and installation cost is low, avoids the trouble customizing separately safety power supply, has and promote practical value preferably.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention;
Fig. 2 is the circuit theory diagrams of voltage doubling rectifing circuit;
Fig. 3 is the schematic diagram of antecedent basis signaling conversion circuit and rearmounted basis signal change-over circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated:
As shown in Figure 1, a kind of weak electric signal treatment system, comprise power circuit, information source 51, signal conversion processing circuit 52 and signal output module 9, wherein signal conversion processing circuit 52 obtains the signal of information source 51, and be converted to the first signal, the two composition signal input module 5, signal output module 9 exports final signal, and power circuit provides independent current source through the first isolated gate 3 respectively to described signal input module 5 and signal output module 9;
The first signal that described signal input module 5 exports passes to described signal output module 9 through signal isolation circuit.
In implementation process, described power circuit comprises direct-current voltage reducing circuit 1, this direct-current voltage reducing circuit 1 sends low-voltage DC to inverter 2, this inverter 2 is connected with the power input group of described first isolated gate 3, first power output end group of the first isolated gate 3 is connected with described signal input module 5, and the second source output group of the first isolated gate 3 is connected with described signal output module 9.
In order to each road power supply signal allowing the first isolated gate 3 export meets the demand of information source 51 and respective handling circuit, first power output end group of described first isolated gate 3 is connected with described signal input module 5 after signal input module power supply circuits 4 again, and the second source output group of described first isolated gate 3 is connected with described signal output module 9 after signal output module power supply circuits 8 again.
As shown in Figure 2, including the voltage doubling rectifing circuit of two diodes and two electric capacity compositions in signal input module power supply circuits 4 and signal output module power supply circuits 8, be that diode D2, D3 and electric capacity C4, C5 form in figure.
Be input to isolation and the conversion of signal output to realize signal, described signal isolation circuit is made up of antecedent basis signaling conversion circuit 6, rearmounted basis signal change-over circuit 6 ' and the second isolated gate 7;
Wherein antecedent basis signaling conversion circuit 6 obtains described first signal, and antecedent basis signaling conversion circuit 6 exports secondary signal and passes to described rearmounted basis signal change-over circuit 6 ' through described second isolated gate 7;
Rearmounted basis signal change-over circuit 6 ' exports the 3rd signal to described signal output module 9.
Changed signal by front and back stages basis signal change-over circuit, make signal more stable, accurate, the second isolated gate 7 can isolation voltage signal, allows front and back signal keep apart, makes whole circuit safety and stability more.
As shown in Figure 3, in specific implementation process, described antecedent basis signaling conversion circuit 6 includes operational amplifier A 1, resistance R1, R3, R5, R6, R7, R8, R9 with rearmounted basis signal change-over circuit 6 ', electric capacity C1, C2, C3 and voltage stabilizing didoe D1, wherein:
One end of resistance R1 is connected to positive electrode input, and the other end of resistance R1 is connected with negative electrode input through voltage stabilizing didoe D1;
The other end of resistance R1 is also connected with one end of resistance R3, the other end of described resistance R3 is connected with one end of resistance R5, the other end of resistance R5 is connected with negative electrode output, the other end of described resistance R5 is also connected with one end of resistance R6, and the other end of resistance R6 is connected with described negative electrode input;
The in-phase input end of described operational amplifier A 1 is connected between resistance R3 and resistance R5; The inverting input of operational amplifier A 1 is connected with negative electrode output through resistance R7, operational amplifier A 1 inverting input is also connected with the output of operational amplifier A 1 through resistance R8, and the output of operational amplifier A 1 is connected with positive electrode output by resistance R9;
Described electric capacity C2 is connected between described positive electrode output and negative electrode output;
Described electric capacity C3 is connected at the two ends of resistance R8.
Adopt said structure, signal input module 5 and the Secure isolation between signal output module 9 and power circuit can be realized by the first isolated gate 3, the Secure isolation between signal input module 5 and signal output module 9 can be realized by the second isolated gate 7, can ensure that information source 51 works under being in a security context, the power supply that can make full use of again rear end equipment exports as front end information source and corresponding signal processing circuit are powered, simplify installation and the configuration of power-supply device, reduce system cost.In antecedent basis signaling conversion circuit 6 with rearmounted basis signal change-over circuit 6 ', can improve voltage by operational amplifier A 1, strengthen electric current, improve driving force, the circuit for rear end provides satisfactory current signal.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention but not restriction technologies scheme, although applicant's reference preferred embodiment is to invention has been detailed description, those skilled in the art is to be understood that, those are modified to technical scheme of the present invention or equivalent replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of right of the present invention.
Claims (4)
1. a weak electric signal treatment system, comprise information source (51), signal conversion processing circuit (52) and signal output module (9), wherein signal conversion processing circuit (52) obtains the signal of information source (51), and be converted to the first signal, the two composition signal input module (5), signal output module (9) exports final signal, it is characterized in that: also comprise power circuit, this power circuit provides independent current source through the first isolated gate (3) respectively to described signal input module (5) and signal output module (9);
The first signal that described signal input module (5) exports passes to described signal output module (9) through signal isolation circuit;
Described signal isolation circuit is made up of antecedent basis signaling conversion circuit (6), rearmounted basis signal change-over circuit (6 ') and the second isolated gate (7);
Wherein antecedent basis signaling conversion circuit (6) obtains described first signal, and antecedent basis signaling conversion circuit (6) exports secondary signal and passes to described rearmounted basis signal change-over circuit (6 ') through described second isolated gate (7);
Rearmounted basis signal change-over circuit (6 ') exports the 3rd signal to described signal output module (9);
Described antecedent basis signaling conversion circuit (6) and rearmounted basis signal change-over circuit (6 ') include operational amplifier A 1, resistance R1, R3, R5, R6, R7, R8, R9, electric capacity C1, C2, C3 and voltage stabilizing didoe D1, wherein:
One end of resistance R1 is connected to positive electrode input, and the other end of resistance R1 is connected with negative electrode input through voltage stabilizing didoe D1;
The other end of resistance R1 is also connected with one end of resistance R3, the other end of described resistance R3 is connected with one end of resistance R5, the other end of resistance R5 is connected with negative electrode output, the other end of described resistance R5 is also connected with one end of resistance R6, and the other end of resistance R6 is connected with described negative electrode input;
The in-phase input end of described operational amplifier A 1 is connected between resistance R3 and resistance R5; The inverting input of operational amplifier A 1 is connected with negative electrode output through resistance R7, operational amplifier A 1 inverting input is also connected with the output of operational amplifier A 1 through resistance R8, and the output of operational amplifier A 1 is connected with positive electrode output by resistance R9;
Described electric capacity C2 is connected between described positive electrode output and negative electrode output;
Described electric capacity C3 is connected at the two ends of resistance R8.
2. weak electric signal treatment system according to claim 1, it is characterized in that: described power circuit comprises direct-current voltage reducing circuit (1), this direct-current voltage reducing circuit (1) sends low-voltage DC to inverter (2), this inverter (2) is connected with the power input group of described first isolated gate (3), first power output end group of the first isolated gate (3) is connected with described signal input module (5), and the second source output group of the first isolated gate (3) is connected with described signal output module (9).
3. weak electric signal treatment system according to claim 2, it is characterized in that: the first power output end group of described first isolated gate (3) is connected with described signal input module (5) after signal input module power supply circuits (4) again, the second source output group of described first isolated gate (3) is connected with described signal output module (9) after signal output module power supply circuits (8) again.
4. weak electric signal treatment system according to claim 3, is characterized in that: the voltage doubling rectifing circuit including two diodes and two electric capacity compositions in described signal input module power supply circuits (4) and signal output module power supply circuits (8).
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| CN201310362044.4A CN103457579B (en) | 2013-08-19 | 2013-08-19 | Weak electric signal treatment system |
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| CN201310362044.4A CN103457579B (en) | 2013-08-19 | 2013-08-19 | Weak electric signal treatment system |
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| CN103457579B true CN103457579B (en) | 2016-01-20 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2748994Y (en) * | 2004-11-30 | 2005-12-28 | 上海神开科技工程有限公司 | Pump stroke signal collecting device with isolation grating |
| CN101083434A (en) * | 2007-07-11 | 2007-12-05 | 中国航天科技集团公司第五研究院第五一○研究所 | High performance isolation starting circuit |
| CN201418134Y (en) * | 2009-01-12 | 2010-03-03 | 王晓庆 | Video separating distributor |
| US7969184B1 (en) * | 2007-09-06 | 2011-06-28 | Tabula, Inc. | Configurable high speed high voltage input/output circuit for an IC |
| CN201886056U (en) * | 2010-10-09 | 2011-06-29 | 佛山市中格威电子有限公司 | Test circuit capable of realizing isolation among power supplies, input signals and output signals |
| CN103236835A (en) * | 2013-04-09 | 2013-08-07 | 浙江威星智能仪表股份有限公司 | Signal isolation grid circuit |
-
2013
- 2013-08-19 CN CN201310362044.4A patent/CN103457579B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2748994Y (en) * | 2004-11-30 | 2005-12-28 | 上海神开科技工程有限公司 | Pump stroke signal collecting device with isolation grating |
| CN101083434A (en) * | 2007-07-11 | 2007-12-05 | 中国航天科技集团公司第五研究院第五一○研究所 | High performance isolation starting circuit |
| US7969184B1 (en) * | 2007-09-06 | 2011-06-28 | Tabula, Inc. | Configurable high speed high voltage input/output circuit for an IC |
| CN201418134Y (en) * | 2009-01-12 | 2010-03-03 | 王晓庆 | Video separating distributor |
| CN201886056U (en) * | 2010-10-09 | 2011-06-29 | 佛山市中格威电子有限公司 | Test circuit capable of realizing isolation among power supplies, input signals and output signals |
| CN103236835A (en) * | 2013-04-09 | 2013-08-07 | 浙江威星智能仪表股份有限公司 | Signal isolation grid circuit |
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