CN103457579A - Weak current signal processing system - Google Patents
Weak current signal processing system Download PDFInfo
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- CN103457579A CN103457579A CN2013103620444A CN201310362044A CN103457579A CN 103457579 A CN103457579 A CN 103457579A CN 2013103620444 A CN2013103620444 A CN 2013103620444A CN 201310362044 A CN201310362044 A CN 201310362044A CN 103457579 A CN103457579 A CN 103457579A
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Abstract
The invention discloses a weak current signal processing system which comprises a signal source, a signal conversion processing circuit and a signal output module. The signal conversion processing circuit acquires signals of the signal source and converts the signals into first signals, the signal conversion processing circuit and the signal source form a signal input module, and the signal input module outputs final signals. The weak current signal processing system is characterized by furthering comprising a power circuit. The power circuit provides independent power supplies for the signal input module and the signal input module respectively through a first isolation gate; the first signals output by the signal input module are transmitted to the signal output module through a signal isolation circuit. The weak current signal processing system has the advantages that safety performance is high, two isolation modules are adopted to isolate power supply input, signal input and signal output into three main parts, therefore, safe power supply and signal transmission can be guaranteed, accidents at an signal source end due to equipment current mixing are avoided, besides, power supply is convenient, installation cost is low, and the trouble of customizing a safety power supply independently is saved.
Description
Technical field
The present invention relates to a kind of electronic circuit, specifically, is a kind for the treatment of system of the weak electric signal for 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 signals usually adopt transducer to extract, detected signal is very faint, often needs to carry out through special treatment circuit that signal amplifies and signal shaping just can offer subsequent conditioning circuit or equipment use.Existing various transducer and signal processing circuit often adopt active device, need independent current source to power to it, the installation of equipment and apply cumbersomely, and the power supply cost is higher.And, for some special screnes, the security performance of power supply also is 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, power supply output forward end sensor device and corresponding signal processing circuit thereof by rear end equipment provide power supply, both simplify the cost of power-supply device, guaranteed again the safety 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 is obtained the signal of information source, and be converted to first signal, the two forms signal input module, signal output module output final signal, its key is: also comprise power circuit, this power circuit provides independent current source to described signal input module and signal output module respectively through the first isolated gate;
The first signal of described signal input module output passes to described signal output module through signal isolation circuit.
Can realize the safety isolation between signal input module and signal output module and power circuit by the first isolated gate, can realize the safety isolation between signal input module and signal output module by signal isolation circuit, can guarantee that information source works under a security context, the power supply that can take full advantage of again rear end equipment is output as front end information source and the power supply of corresponding signal processing circuit, 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 the first isolated gate, the 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.
Usually the rear end equipment power supply is output 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 the direct-current voltage reducing circuit adjustment to carry out the step-down processing, the recycling inverter power circuit is converted to the direct current input to exchange output.
Further describe again, the first power output end group of described the first isolated gate is connected with described signal input module after the signal input module power supply circuits again, and the second source output group of described the first isolated gate is connected with described signal output module after the signal output module power supply circuits again.Because the power supply signal picked up from the first isolated gate is relatively weak AC signal, therefore also need signalization input module power supply circuits and signal output module power supply circuits to be processed it.
Generally, include the voltage doubling rectifing circuits that two diodes and two electric capacity form in described signal input module power supply circuits and signal output module power supply circuits, thereby meet information source and other signal processing circuits demand to power supply.
And, in order to realize the demand of signal isolation, described signal isolation circuit is comprised of preposition basis signal change-over circuit, rearmounted basis signal change-over circuit and the second isolated gate;
Wherein preposition basis signal change-over circuit obtains described first signal, and preposition basis signal change-over circuit output secondary signal passes to described rearmounted basis signal change-over circuit through described the second isolated gate;
Rearmounted basis signal change-over circuit output the 3rd signal is given described signal output module.
As preferably, described preposition basis signal change-over circuit and rearmounted basis signal change-over circuit include operational amplifier A 1, resistance R 1, R3, R5, R6, R7, R8, R9, and capacitor C 1, C2, C3 and voltage stabilizing didoe D1, wherein:
One end of resistance R 1 is connected to the positive electrode input, and the other end of resistance R 1 is connected with the negative electrode input through voltage stabilizing didoe D1;
The other end of resistance R 1 also is connected with an end of resistance R 3, the other end of described resistance R 3 is connected with an end of resistance R 5, the other end of resistance R 5 is connected with the negative electrode output, the other end of described resistance R 5 also is connected with an end of resistance R 6, and the other end of resistance R 6 is connected with described negative electrode input;
The in-phase input end of described operational amplifier A 1 is connected between resistance R 3 and resistance R 5; The inverting input of operational amplifier A 1 is connected with the negative electrode output through resistance R 7, operational amplifier A 1 inverting input also is connected with the output of operational amplifier A 1 through resistance R 8, and the output of operational amplifier A 1 is connected with the positive electrode output by resistance R 9;
Connect described capacitor C 2 between described positive electrode output and negative electrode output;
Connect described capacitor C 3 at the two ends of resistance R 8.
The present invention has following beneficial effect:
1, security performance is high: weak electric signal treatment system of the present invention has adopted two isolation modules that power supply input, signal input and signal output are isolated into to three parts, can guarantee the safe transmission of power supply and signal, prevent the equipment crosstalk and cause that the security incident of information source end occurs.
2, the power supply supply is convenient, and installation cost is low, avoids customizing separately the trouble of safety power supply, has and promotes preferably practical value.
The 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 preposition basis signal change-over 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 is obtained the signal of information source 51, and be converted to first signal, the two forms signal input module 5, signal output module 9 output final signals, and power circuit provides independent current source to described signal input module 5 and signal output module 9 respectively through the first isolated gate 3;
The first signal of described signal input module 5 outputs 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 the first isolated gate 3, the 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 allow the first isolated gate 3 output Ge road power supply signals meet the demand of information source 51 and respective handling circuit, the first power output end group of described the 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 the 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 two diodes and two voltage doubling rectifing circuits that electric capacity forms in signal input module power supply circuits 4 and signal output module power supply circuits 8, is that diode D2, D3 and capacitor C 4, C5 form in figure.
In order to realize that signal is input to isolation and the conversion of signal output, described signal isolation circuit is comprised of preposition basis signal change-over circuit 6, rearmounted basis signal change-over circuit 6 ' and the second isolated gate 7;
Wherein preposition basis signal change-over circuit 6 obtains described first signal, and preposition basis signal change-over circuit 6 output secondary signals pass to described rearmounted basis signal change-over circuit 6 ' through described the second isolated gate 7;
Rearmounted basis signal change-over circuit 6 ' is exported the 3rd signal to described signal output module 9.
By front and back stages basis signal change-over circuit, signal is changed, made signal more stable, accurate, the second isolated gate 7 can the isolation voltage signal, and before and after allowing, signal is kept apart, and makes whole circuit safety and stability more.
As shown in Figure 3, in specific implementation process, described preposition basis signal change-over circuit 6 includes operational amplifier A 1, resistance R 1, R3, R5, R6, R7, R8, R9 with rearmounted basis signal change-over circuit 6 ', capacitor C 1, C2, C3 and voltage stabilizing didoe D1, wherein:
One end of resistance R 1 is connected to the positive electrode input, and the other end of resistance R 1 is connected with the negative electrode input through voltage stabilizing didoe D1;
The other end of resistance R 1 also is connected with an end of resistance R 3, the other end of described resistance R 3 is connected with an end of resistance R 5, the other end of resistance R 5 is connected with the negative electrode output, the other end of described resistance R 5 also is connected with an end of resistance R 6, and the other end of resistance R 6 is connected with described negative electrode input;
The in-phase input end of described operational amplifier A 1 is connected between resistance R 3 and resistance R 5; The inverting input of operational amplifier A 1 is connected with the negative electrode output through resistance R 7, operational amplifier A 1 inverting input also is connected with the output of operational amplifier A 1 through resistance R 8, and the output of operational amplifier A 1 is connected with the positive electrode output by resistance R 9;
Connect described capacitor C 2 between described positive electrode output and negative electrode output;
Connect described capacitor C 3 at the two ends of resistance R 8.
Adopt said structure, can realize the safety isolation between signal input module 5 and signal output module 9 and power circuit by the first isolated gate 3, can realize the safety isolation between signal input module 5 and signal output module 9 by the second isolated gate 7, can guarantee that information source 51 works under a security context, the power supply that can take full advantage of again rear end equipment is output as front end information source and the power supply of corresponding signal processing circuit, simplify installation and the configuration of power-supply device, reduce system cost.In preposition basis signal change-over circuit 6 and rearmounted basis signal change-over circuit 6 ', can improve voltage by operational amplifier A 1, strengthen electric current, improve driving force, for the circuit of 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 the restriction technologies scheme, although the applicant has been described in detail the present invention with reference to preferred embodiment, those skilled in the art is to be understood that, those are modified or are equal to replacement technical scheme of the present invention, and do not break away from aim and the scope of the technical program, all should be encompassed in the middle of claim scope of the present invention.
Claims (6)
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) is obtained the signal of information source (51), and be converted to first signal, the two forms signal input module (5), signal output module (9) output final signal, it is characterized in that: also comprise power circuit, this power circuit provides independent current source to described signal input module (5) and signal output module (9) respectively through the first isolated gate (3);
The first signal of described signal input module (5) output passes to described signal output module (9) through signal isolation circuit.
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 the first isolated gate (3), the 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 the 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 the 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: include two diodes and two voltage doubling rectifing circuits that electric capacity forms in described signal input module power supply circuits (4) and signal output module power supply circuits (8).
5. according to any described weak electric signal treatment system of claim of claim 1 to 4, it is characterized in that: described signal isolation circuit is comprised of preposition basis signal change-over circuit (6), rearmounted basis signal change-over circuit (6 ') and the second isolated gate (7);
Wherein preposition basis signal change-over circuit (6) obtains described first signal, and preposition basis signal change-over circuit (6) output secondary signal passes to described rearmounted basis signal change-over circuit (6 ') through described the second isolated gate (7);
Rearmounted basis signal change-over circuit (6 ') is exported the 3rd signal to described signal output module (9).
6. weak electric signal treatment system according to claim 5, it is characterized in that: described preposition basis signal change-over circuit (6) includes operational amplifier A 1 with rearmounted basis signal change-over circuit (6 '), resistance R 1, R3, R5, R6, R7, R8, R9, capacitor C 1, C2, C3 and voltage stabilizing didoe D1, wherein:
One end of resistance R 1 is connected to the positive electrode input, and the other end of resistance R 1 is connected with the negative electrode input through voltage stabilizing didoe D1;
The other end of resistance R 1 also is connected with an end of resistance R 3, the other end of described resistance R 3 is connected with an end of resistance R 5, the other end of resistance R 5 is connected with the negative electrode output, the other end of described resistance R 5 also is connected with an end of resistance R 6, and the other end of resistance R 6 is connected with described negative electrode input;
The in-phase input end of described operational amplifier A 1 is connected between resistance R 3 and resistance R 5; The inverting input of operational amplifier A 1 is connected with the negative electrode output through resistance R 7, operational amplifier A 1 inverting input also is connected with the output of operational amplifier A 1 through resistance R 8, and the output of operational amplifier A 1 is connected with the positive electrode output by resistance R 9;
Connect described capacitor C 2 between described positive electrode output and negative electrode output;
Connect described capacitor C 3 at the two ends of resistance R 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 CN103457579B (en) | 2016-01-20 |
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|---|---|---|---|---|
| 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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| CN103457579B (en) | 2016-01-20 |
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