CN204613278U - A kind of voltage acquisition shielding system - Google Patents
A kind of voltage acquisition shielding system Download PDFInfo
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- CN204613278U CN204613278U CN201520188948.4U CN201520188948U CN204613278U CN 204613278 U CN204613278 U CN 204613278U CN 201520188948 U CN201520188948 U CN 201520188948U CN 204613278 U CN204613278 U CN 204613278U
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Abstract
The utility model relates to potential circuit technical field, especially a kind of voltage acquisition shielding system.It comprises voltage collection circuit and voltage isolation circuit; Voltage collection circuit comprises AQW214 type relay and the 3rd amplifier, 5th pin of relay is connected with the in-phase input end of the 3rd amplifier by the tenth resistance, the 7th pin is connected with the inverting input of the 3rd amplifier by the 9th resistance, and the signal output part of the 3rd amplifier connects voltage isolation circuit; Voltage isolation circuit comprises the first amplifier, the second amplifier and HCNR2O1 Linear optocoupler, the signal output part of the first amplifier is connected with the 4th pin of linear optical coupling with the first triode by the 6th resistance, and the 5th pin of linear optical coupling and the 6th pin are connected with the inverting input of the second amplifier and in-phase input end respectively.Voltage collection circuit of the present utility model ensures accuracy and the security of circuit, voltage isolation circuit make its stability and the linearity high; There is very strong practicality and use value.
Description
Technical field
The utility model relates to potential circuit technical field, especially a kind of voltage acquisition shielding system.
Background technology
Along with the enhancing of people's environmental consciousness and be becoming tight the day of the energy, the electric automobile of lithium battery is subject to the extensive concern of country and the common people.For guaranteeing that lithium battery is used safely, electric automobile all can be equipped with a set of battery management system in use.But in battery data acquisition system, when needing the common problem solved to be exactly the use of multiple serial battery, the problem such as high voltage, measuring system likely can cause danger.Dangerous in order to get rid of these, to buffer circuit be used in battery data acquisition system.When carrying out in-site measurement, also have various electromagnetic interference signal superposition in useful measured signal, the accuracy of measurement can be made to reduce.In order to ensure the security of system works, and reducing the impact of neighbourhood noise on test circuit, often circuit-under-test and test circuit being isolated.
In vehicle electric system, data acquisition is basis and the key of whole battery management system, especially for lithium battery, the precision of collection and speed to the serviceable life of battery so that the safe and reliable operation of whole system most important.Have at present much for the method that lithium battery voltage gathers, as electric resistance partial pressure method and lithium battery management system special chip method etc., also can there is shortcoming in accuracy and the security aspect of circuit.
Utility model content
For above-mentioned the deficiencies in the prior art, the purpose of this utility model is the voltage acquisition shielding system providing a kind of linearity, precision and stability high.
To achieve these goals, the utility model adopts following technical scheme:
A kind of voltage acquisition shielding system, it comprises voltage collection circuit and voltage isolation circuit, described voltage collection circuit comprises an AQW214 type relay and the 3rd amplifier, 5th pin of described relay is connected with the in-phase input end of the 3rd amplifier by the tenth resistance, 7th pin is connected with the inverting input of the 3rd amplifier by the 9th resistance, 6th pin and the 8th pin of described relay are connected positive pole and the negative pole of battery respectively, the 12 resistance is in series with between the inverting input of described 3rd amplifier and its signal output part, in-phase input end is by the 11 resistance eutral grounding, the signal output part of described 3rd amplifier is connected to voltage isolation circuit,
Described voltage isolation circuit comprises the first amplifier, the second amplifier, the first triode and HCNR2O1 Linear optocoupler, the inverting input of described first amplifier is connected with the signal output part of the 3rd amplifier by the 7th resistance and is connected with the second pin of linear optical coupling, the signal output part of described first amplifier to be connected with the base stage of the first triode by the 6th resistance and to be connected to its inverting input by the first electric capacity, and the emitter and collector of described first triode is connected+15V power supply respectively by the 3rd resistance with the 5th resistance;
4th pin of described linear optical coupling is directly connected with the collector of the first triode and passes through the 4th resistance and connects-15V power supply, the first diode is parallel with between 3rd pin of described linear optical coupling and the 4th pin, 5th pin of described linear optical coupling and the 6th pin are connected with the inverting input of the second amplifier and in-phase input end respectively, be parallel with the second electric capacity between the inverting input of described second amplifier and its signal output part, the two ends of described second electric capacity are serially connected with the second resistance and the first adjustable resistance successively.
Preferably, described first amplifier, the second amplifier and the 3rd amplifier are TL082 type.
Owing to have employed such scheme, the utility model is gathered voltage by the voltage collection circuit being core with AQW214 type relay, can ensure accuracy and the security of circuit; Meanwhile, the voltage isolation circuit that to utilize with HCNR2O1 Linear optocoupler be core is isolated voltage, make its stability and the linearity high; There is very strong practicality and popularizing value.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the voltage collection circuit of the utility model embodiment;
Fig. 2 is the structural drawing of the voltage isolation circuit of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As depicted in figs. 1 and 2, a kind of voltage acquisition shielding system of the present embodiment, it comprises voltage collection circuit and voltage isolation circuit, wherein, voltage collection circuit comprises an AQW214 type relay U4 and the 3rd amplifier U5, 5th pin of relay U4 is connected with the in-phase input end of the 3rd amplifier U5 by the tenth resistance R10, 7th pin is connected with the inverting input of the 3rd amplifier U5 by the 9th resistance R9, 6th pin and the 8th pin of relay U4 are connected positive pole BAT+ and the negative pole BAT-of battery respectively, the 12 resistance R12 is in series with between the inverting input of the 3rd amplifier U5 and its signal output part, in-phase input end is by the 11 resistance R11 ground connection, the signal output part of the 3rd amplifier U5 is connected to voltage isolation circuit.
The battery that the present embodiment is used is single lithium battery, because single lithium battery data acquisition system (DAS) only gathers the voltage of cell, therefore directly the voltage at battery two ends is carried out difference.Relay U4 is high-performance and the economical semiconductor relay had both, and disconnects battery and voltage collection circuit, can not be leaked electricity when battery voltage acquisition system is not worked by voltage collection circuit with it.In addition, relay U4 also act as the role of protection circuit, because leakage current when it is opened a way is minimum, so can not threaten accuracy and the security of circuit when switch disconnects.
Voltage isolation circuit comprises the first amplifier U1, the second amplifier U2, the first triode Q1 and HCNR2O1 Linear optocoupler U3, the inverting input of the first amplifier U1 is connected with the signal output part of the 3rd amplifier U5 by the 7th resistance R7 and is connected with second pin of linear optical coupling U3, the signal output part of the first amplifier U1 to be connected with the base stage of the first triode Q1 by the 6th resistance R6 and to be connected to its inverting input by the first electric capacity C1, and the emitter and collector of the first triode Q1 is connected+15V power supply respectively by the 3rd resistance R3 with the 5th resistance R5;
4th pin of linear optical coupling U3 is directly connected with the collector of the first triode Q1 and passes through the 4th resistance R4 and connects-15V power supply, the first diode D1 is parallel with between 3rd pin of linear optical coupling U3 and the 4th pin, 5th pin of linear optical coupling U3 and the 6th pin are connected with the inverting input of the second amplifier U2 and in-phase input end respectively, be parallel with the second electric capacity C2 between the inverting input of the second amplifier U2 and its signal output part, the two ends of the second electric capacity C2 are serially connected with the second resistance R2 and the first adjustable resistance R1 successively.Greatly reduce to make the error between input voltage and output voltage, improve the impact of power supply error, other device errors and environmental factor and the situation causing circuit linearity degree undesirable, the first amplifier U1, the second amplifier U2 and the 3rd amplifier U5 are TL082 type.
Voltage isolation circuit realizes Signals & Systems isolation and linear measurement dual-use function, its principle of work: inside LED and PD1, the first triode Q1 and the first amplifier U1 of linear optical coupling U3 etc. form the importation of voltage isolation circuit and form negative feedback, the inside PD2 of the second amplifier U2, linear optical coupling U3 etc. form the output of voltage isolation circuit; When input voltage changes, under the effect of the first amplifier U1, LED current I1 is along with adjustment; The physical arrangement of linear optical coupling U3 determines PD1 and LED linearly, so the electric current I 2 flowing through PD1 followed by input voltage change; PD2 and PD1 becomes strict proportionate relationship again, and the electric current I PD2 flowing through PD2 equally follows input voltage change, converts IPD2 to output voltage, finally realize the precision linear relation of output voltage and input voltage by the second amplifier U2 and the first adjustable resistance R1.First electric capacity C1 and the second electric capacity C2 as building-out capacitor for improvement of circuit stability, reduce the bandwidth of operation of circuit output noise and limiting circuit in about 10kHz; First diode D1 plays afterflow effect, and when preventing LED from turning off completely, too high back-pressure is added in LED two ends.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (2)
1. a voltage acquisition shielding system, it is characterized in that: it comprises voltage collection circuit and voltage isolation circuit, described voltage collection circuit comprises an AQW214 type relay and the 3rd amplifier, 5th pin of described relay is connected with the in-phase input end of the 3rd amplifier by the tenth resistance, 7th pin is connected with the inverting input of the 3rd amplifier by the 9th resistance, 6th pin and the 8th pin of described relay are connected positive pole and the negative pole of battery respectively, the 12 resistance is in series with between the inverting input of described 3rd amplifier and its signal output part, in-phase input end is by the 11 resistance eutral grounding, the signal output part of described 3rd amplifier is connected to voltage isolation circuit,
Described voltage isolation circuit comprises the first amplifier, the second amplifier, the first triode and HCNR201 Linear optocoupler, the inverting input of described first amplifier is connected with the signal output part of the 3rd amplifier by the 7th resistance and is connected with the second pin of linear optical coupling, the signal output part of described first amplifier to be connected with the base stage of the first triode by the 6th resistance and to be connected to its inverting input by the first electric capacity, and the emitter and collector of described first triode is connected+15V power supply respectively by the 3rd resistance with the 5th resistance;
4th pin of described linear optical coupling is directly connected with the collector of the first triode and passes through the 4th resistance and connects-15V power supply, the first diode is parallel with between 3rd pin of described linear optical coupling and the 4th pin, 5th pin of described linear optical coupling and the 6th pin are connected with the inverting input of the second amplifier and in-phase input end respectively, be parallel with the second electric capacity between the inverting input of described second amplifier and its signal output part, the two ends of described second electric capacity are serially connected with the second resistance and the first adjustable resistance successively.
2. a kind of voltage acquisition shielding system as claimed in claim 1, is characterized in that: described first amplifier, the second amplifier and the 3rd amplifier are TL082 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520188948.4U CN204613278U (en) | 2015-03-31 | 2015-03-31 | A kind of voltage acquisition shielding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520188948.4U CN204613278U (en) | 2015-03-31 | 2015-03-31 | A kind of voltage acquisition shielding system |
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| Publication Number | Publication Date |
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| CN204613278U true CN204613278U (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520188948.4U Expired - Fee Related CN204613278U (en) | 2015-03-31 | 2015-03-31 | A kind of voltage acquisition shielding system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373374A (en) * | 2016-11-28 | 2017-02-01 | 长沙广义变流技术有限公司 | Small signal isolation transmission circuit |
| CN107656121A (en) * | 2017-11-09 | 2018-02-02 | 珠海泰坦科技股份有限公司 | A kind of low cost DC voltage isolation picking circuit |
-
2015
- 2015-03-31 CN CN201520188948.4U patent/CN204613278U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373374A (en) * | 2016-11-28 | 2017-02-01 | 长沙广义变流技术有限公司 | Small signal isolation transmission circuit |
| CN107656121A (en) * | 2017-11-09 | 2018-02-02 | 珠海泰坦科技股份有限公司 | A kind of low cost DC voltage isolation picking circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150902 Termination date: 20160331 |
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| CF01 | Termination of patent right due to non-payment of annual fee |