CN105301335A - Circuit for sampling voltage and conditioning signals - Google Patents
Circuit for sampling voltage and conditioning signals Download PDFInfo
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- CN105301335A CN105301335A CN201510921274.9A CN201510921274A CN105301335A CN 105301335 A CN105301335 A CN 105301335A CN 201510921274 A CN201510921274 A CN 201510921274A CN 105301335 A CN105301335 A CN 105301335A
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Abstract
The invention discloses a circuit for sampling voltage and conditioning signals. The circuit comprises a voltage sampling circuit and a signal conditioning circuit, wherein the voltage sampling circuit comprises a first resistor and a second resistor; a first end of the first resistor is used as a signal input end and a second end of the first resistor is used as the first end of the second resistor; the end is also connected with the signal conditioning circuit; the second end of the second resistor is grounded; the signal conditioning circuit is used for outputting unipolar voltage and comprises an operational amplifier, a third resistor and a fourth resistor; the first end of the third resistor is connected to the second end of the first resistor in the voltage sampling circuit and the second end of the third resistor is connected to an in-phase input end of the operational amplifier; the first end of the fourth resistor is used as a reference voltage input end of the signal conditioning circuit and the second end of the fourth resistor is connected to the in-phase input end of the operational amplifier; an opposite-phase input end of the operational amplifier is connected with the output end of the operational amplifier; and one end of a power supply end of the operational amplifier is connected with an external power supply and the other end is grounded.
Description
Technical field
The application relates to circuit engineering field, specifically, relates to a kind of circuit for voltage sample and signal condition.
Background technology
Current, in the transformation and distribution system used in we produce and live, alternating voltage sampling circuit is indispensable part in various alternating-current measuring device.
AC voltage sampling conventional at present mainly contains following several:
(1) voltage transformer (VT) (PT) circuit, see Fig. 4, there is following shortcoming in principle of work:
A) phase shift that can be certain to voltage sample waveform generation, that is can cause the angular difference of mutual inductor, and this angular difference also can change at whole range, Accuracy of Power Measurement will be caused like this to reduce;
B) measurement range is narrow, and during low-voltage input, by the impact that exciting current reduces, precision can reduce;
C) input overload capacity poor, when input voltage is too high, voltage transformer (VT) can seriously generate heat and then damage;
D) owing to using iron core and copper cash, also want embedding, cost of labor is high, so volume is large, cost is high;
E) have superfine enameled wire coiling in, need resin embedding, temperature variation or welding and easily break, reliability is low, high to technological requirement;
F) because be mutual inductor structure, DC voltage and the voltage containing flip-flop can not be measured, otherwise mutual inductor will be saturated, finally damages;
G) carry out work by electromagnetic induction, be easily subject to the interference of electromagnetic field, electromagnetism interference poor performance;
H) temperature coefficient is large, can not do the measurement of wide-range high-accuracy.
(2), see Fig. 5, there is following shortcoming in the small current mutual inductor (CT) of 1:1:
A) phase shift that can be certain to voltage sample waveform generation, that is can cause the angular difference of mutual inductor, and this angular difference also can change at whole range, measuring accuracy will be caused like this to reduce;
B), during low-voltage input, by the impact that exciting current reduces, precision can reduce;
C) input overload capacity poor, when input voltage is too high, the resistance of serial connection and voltage transformer (VT) can seriously generate heat and then damage;
D) need and connect a sampling resistor current transitions is become voltage signal at current transformer (CT) secondary side, and the resistance connect can worsen the angular difference of voltage signal further, further the measuring accuracy of power is impacted, power accuracy is reduced.
E) have superfine enameled wire coiling in, need resin embedding, temperature variation or welding are very easily broken, and reliability is low, high to technological requirement;
F) input range of this current transformer is approximately 0 ~ 2.5mA, in low-pressure system, line voltage is approximately about 400V, at this time the energy of series resistor and mutual inductor and secondary resistance consumption is very considerable, waste electric energy, simultaneously because heating is larger, life of product shortens, and circuit easily lost efficacy;
G) because be mutual inductor structure, DC voltage and the voltage containing flip-flop can not be measured, otherwise mutual inductor will be saturated, finally damages;
H) carry out work by electromagnetic induction, be easily subject to the interference of electromagnetic field, electromagnetism interference poor performance;
I) owing to using iron core and copper cash, also want embedding, cost of labor is high, so volume is large, cost is high;
J) temperature coefficient is large, can not do the measurement of wide-range high-accuracy.
Signal conditioning circuit conventional at present mainly contains following several:
(1), see Fig. 6, there is following shortcoming in amplifier adding circuit:
A) need positive-negative power supply, directly can not use the reference source Vref of AD converter, need to produce a negative Vref by an amplifier and some resistance;
B) this circuit form input impedance is enough not high, in conjunction with signal internal resistance above, brings certain error to measurement; And because of reduction output impedance, and too low input impedance can not be caused, cause large measuring error further due to this circuit, so this circuit output impedance is high, directly connecing adc circuit can generation time problem, affects the accuracy of voltage and power measurement;
C) this circuit amplifier output impedance is high, and loading capability difference loaded with by band, causes circuit output area little; And whole circuit is complicated, use amplifier and precision resistance many, cost is high, poor reliability.
(2), see Fig. 7, there is following shortcoming in capacitive coupling see-saw circuit:
A) use electrochemical capacitor coupling, performance affects greatly by capacitance and material, and the capacity of temperature Influential cases solution electric capacity and life-span;
B) this circuit form input impedance is enough not high, in conjunction with singal source resistance above, brings certain error to measurement; And amplifier output impedance is high, so carrying load ability is poor, cause circuit output area little; Use precision resistance is many, and cost is high;
C) this circuit because of reduction output impedance, and can not cause too low input impedance, causes large measuring error further, so this circuit output impedance is high, directly connects adc circuit meeting generation time problem, affect the accuracy of voltage and power measurement.
Summary of the invention
In view of this, technical problems to be solved in this application there is provided a kind of circuit for voltage sample and signal condition, directly can measure combined-voltage signal or superpose the first stream signal of a large amount of flip-flop in exchanging, have that high linear and precision, reliability are high, strong anti-interference performance.
In order to solve the problems of the technologies described above, the application has following technical scheme:
For a circuit for voltage sample and signal condition, comprise voltage sampling circuit and signal conditioning circuit, described voltage sampling circuit is connected with described signal conditioning circuit, it is characterized in that,
Described voltage sampling circuit is used for carrying out dividing potential drop to high input ac voltage, and export low output AC voltage, comprise at least two resistance be connected in series, be respectively the first resistance and the second resistance, the first end of described first resistance as signal input part, for inputting alternating current-direct current signal or comprising the AC signal of flip-flop; Second end of described first resistance is connected with the first end of described second resistance, and this end is also connected to described signal conditioning circuit, as the voltage input end of described signal conditioning circuit; Second end ground connection of described second resistance;
Described signal conditioning circuit is used for output single-pole voltage, and comprise operational amplifier, the 3rd resistance and the 4th resistance, the first end of described 3rd resistance is connected to the second end of the first resistance described in described voltage sampling circuit, as described voltage input end; Second end of described 3rd resistance is connected to the in-phase input end of described operational amplifier; The first end of described 4th resistance is as the reference voltage input terminal of described signal conditioning circuit, and the second end of described 4th resistance is connected to the in-phase input end of described operational amplifier; The inverting input of described operational amplifier is connected to the output terminal of described operational amplifier, as the output terminal of described signal conditioning circuit; Two power ends of described operational amplifier, one end connects external power source, other end ground connection.
Preferably, wherein:
The each resistance be connected in series in described voltage sampling circuit is high resistance measurement, and the resistance of described first resistance is 100K Ω-10M Ω, and the resistance of described second resistance is 1K Ω-100K Ω.
Preferably, wherein:
The each resistance be connected in series in described voltage sampling circuit is high pressure resistant resistance.
Preferably, wherein:
The each resistance be connected in series in described voltage sampling circuit is low-temperature coefficient resistance.
Preferably, wherein:
The resistance of described 3rd resistance and described 4th resistance is equal.
Preferably, wherein:
The resistance of described 3rd resistance and the 4th resistance is 10K Ω-500K Ω.
Compared with prior art, the method described in the application, reaches following effect:
The first, the application provide in the circuit of voltage sample and signal condition, resistance is resistive load, and avoid because the angular difference that causes of the inductance characteristic of mutual inductor, so circuit of the present invention does not have angular difference, thus precision is high in power measurement.
The second, the application provide in the circuit of voltage sample and signal condition because there is no coil and iron core, do not relate to and carry out transmission of signal with magnetic field, so can not cause non-linear because exciting current is too little, thus when minimum signal, there are the high linearity and precision.
3rd, the application provide in the circuit of voltage sample and signal condition, because adopt the resistance string of high value to input, input current is minimum, even input double even if significantly transship, resistance also can not obviously generate heat, and does not have iron core, there is not saturated situation, the linearity is also still constant.
4th, the application provide in the circuit of voltage sample and signal condition, resistance is high resistance to piezoresistance, and mechanization production, cost is low.Technological standards, reliability is high, there is not the problem of mutual inductor winding broken string.
5th, the application provide in the circuit of voltage sample and signal condition, because do not need variation magnetic field to be coupled, circuit of the present invention directly can be measured combined-voltage signal or superpose the AC signal of a large amount of flip-flop in exchanging, and there is not saturated drawback.
6th, the application provide in the circuit of voltage sample and signal condition, there is no coil and iron core, be subject to the interference of electromagnetic field hardly, therefore strong anti-interference performance.
7th, the resistance cost that the circuit for voltage sample and signal condition that the application provides needs is extremely low, and volume is little, and in prior art, mutual inductor is expensive, and volume is large, takies PCB surface long-pending large.
8th, the application in voltage sampling circuit adopt low-temperature coefficient resistance, high precision can be accomplished at wide temperature range.
9th, the circuit for voltage sample and signal condition that the application provides, can adopt single power supply, directly can use the reference power source Vref of ADC, without the need to extra circuit.
Tenth, the circuit for voltage sample and signal condition that the application provides, the input impedance of signal conditioning circuit is high, can meet the output of various employing circuit, and output impedance is extremely low, and carrying load ability is strong, can realize profound and negative feedbck, circuit stability; Output area is large, and output signal can relatively 0V; The precision of whole circuit depends on two resistance in signal conditioning circuit, and temperature limit is wide.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present application, and form a application's part, the schematic description and description of the application, for explaining the application, does not form the improper restriction to the application.In the accompanying drawings:
Fig. 1 forms schematic diagram for the one of the circuit of voltage sample and signal condition in the embodiment of the present invention 1;
Fig. 2 forms schematic diagram for the one of the circuit of voltage sample and signal condition in the embodiment of the present invention 2;
Fig. 3 forms schematic diagram for the one of the circuit of voltage sample and signal condition in the embodiment of the present invention 3;
Fig. 4 is the formation schematic diagram of voltage transformer (VT) (PT) circuit in prior art;
Fig. 5 is the formation schematic diagram of the small current mutual inductor (CT) of 1:1 in prior art;
Fig. 6 is the formation schematic diagram of amplifier adding circuit in prior art;
Fig. 7 is the formation schematic diagram of capacitive coupling see-saw circuit in prior art.
Embodiment
As employed some vocabulary to censure specific components in the middle of instructions and claim.Those skilled in the art should understand, and hardware manufacturer may call same assembly with different noun.This specification and claims are not used as with the difference of title the mode distinguishing assembly, but are used as the criterion of differentiation with assembly difference functionally." comprising " as mentioned in the middle of instructions and claim is in the whole text an open language, therefore should be construed to " comprise but be not limited to "." roughly " refer to that in receivable error range, those skilled in the art can solve the technical problem within the scope of certain error, reach described technique effect substantially.In addition, " couple " word and comprise directly any and indirectly electric property coupling means at this.Therefore, if describe a first device in literary composition to be coupled to one second device, then represent described first device and directly can be electrically coupled to described second device, or be indirectly electrically coupled to described second device by other devices or the means that couple.Instructions subsequent descriptions is implement the better embodiment of the application, and right described description is for the purpose of the rule that the application is described, and is not used to the scope limiting the application.The protection domain of the application is when being as the criterion depending on the claims person of defining.
Embodiment 1
Formation schematic diagram for the circuit for voltage sample and signal condition a kind of described in the application shown in Figure 1, for the circuit of voltage sample and signal condition in the present embodiment, comprise voltage sampling circuit and signal conditioning circuit, described voltage sampling circuit is connected with described signal conditioning circuit, described voltage sampling circuit is used for carrying out dividing potential drop to high input ac voltage, and export low output AC voltage, comprise two resistance be connected in series, be respectively the first resistance R1 and the second resistance R2, the first end of described first resistance R1 is as signal input part 1, for inputting alternating current-direct current signal or comprising the AC signal of flip-flop, second end of described first resistance R1 is connected with the first end of described second resistance R2, and this end is also connected to described signal conditioning circuit, as the voltage input end Vin of described signal conditioning circuit, the second end ground connection of described second resistance R2,
Described signal conditioning circuit is used for output single-pole voltage, comprise operational amplifier, the 3rd resistance R3 and the 4th resistance R4, the first end of described 3rd resistance R3 is connected to second end of the first resistance R1 described in described voltage sampling circuit, as described voltage input end Vin; Second end of described 3rd resistance R3 is connected to the in-phase input end 2 of described operational amplifier; The first end of described 4th resistance R4 is as the reference voltage input terminal Vref of described signal conditioning circuit, and second end of described 4th resistance R4 is connected to the in-phase input end 2 of described operational amplifier; The inverting input 3 of described operational amplifier is connected to the output terminal of described operational amplifier, as the output end vo ut of described signal conditioning circuit; Two power ends of described operational amplifier, one end connects external power source, other end ground connection.
The each resistance be connected in series in voltage sampling circuit in Fig. 1 is high resistance measurement, and the resistance of described first resistance R1 is 100K Ω-10M Ω, and the resistance of described second resistance R2 is 1K Ω-100K Ω.Adopt the resistance string of high value to input, input current is minimum, and even input double even if significantly transship, resistance also can not obviously generate heat, and does not have iron core, there is not saturated situation, and the linearity is still constant.
The each resistance be connected in series in voltage sampling circuit in Fig. 1 is high pressure resistant resistance, thus can realize mechanization production, and cost is low, technological standards, reliability are high, there is not the problem of mutual inductor winding broken string.
The each resistance be connected in series in voltage sampling circuit in Fig. 1 is low-temperature coefficient resistance, can either high temperature resistant again can be low temperature resistant, high precision can be realized in wide temperature range again.
The 3rd resistance in signal conditioning circuit in Fig. 1 is equal with the resistance of the 4th resistance, therefore sampled voltage and reference voltage Vref obtain voltage for (Vin+Vout)/2 through the 3rd resistance and the summation of the 4th resistance to can be taken as 10K Ω-500K Ω, this voltage exports Vout through operational amplifier, the electric polarity that Vout is is unipolarity, therefore can enter unipolar A/D and carry out Analog-digital Converter, because amplifier is operated in follower state, so there is minimum output impedance, the strongest carrying load ability, maximum output area.These characteristics are that traditional circuit does not have, and owing to not having mutual inductor sample, therefore this circuit can also be measured the voltage signal comprising flip-flop.
The present invention, from sample circuit to signal conditioning circuit, achieves and carries out high-acruracy survey to alternating current-direct current stream voltage and the alternating voltage comprising flip-flop, for the power and electric energy measurement exchanging high-precision power or electric energy instrument provides possibility.And simple circuit of the present invention, reliability are high, serviceability temperature wide ranges, cost is but low than traditional circuit cost.
Embodiment 2
The present invention is used for also can adopting the embodiment shown in Fig. 2 to realize in the circuit of voltage sample and signal condition.Compared with embodiment illustrated in fig. 1,5 resistance are in series with in voltage sampling circuit in Fig. 2,5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9 connect successively, one end of 5th resistance R5 as signal input part 1, for inputting alternating current-direct current signal or comprising the AC signal of flip-flop; One end that 8th resistance R8 is connected with the 9th resistance R9 is also connected to signal conditioning circuit, as the voltage input end Vin of signal conditioning circuit; The other end ground connection of the 9th resistance R9.
Embodiment 3
The present invention is used for also can adopting the embodiment shown in Fig. 2 to realize in the circuit of voltage sample and signal condition.Compare with embodiment illustrated in fig. 2 with Fig. 1, voltage sampling circuit in Fig. 3 is in series with 4 resistance, resistance R10, resistance R11, resistance R12 and resistance R13 connect successively, the first end of resistance R10 as signal input part 1, for inputting alternating current-direct current signal or comprising the AC signal of flip-flop; One end that resistance R11 is connected with resistance R12 is also connected to signal conditioning circuit, as the voltage input end Vin of signal conditioning circuit; One end ground connection of resistance R13.
Known by above each embodiment, the beneficial effect that the application exists is:
The first, the application provide in the circuit of voltage sample and signal condition, resistance is resistive load, and avoid because the angular difference that causes of the inductance characteristic of mutual inductor, so circuit of the present invention does not have angular difference, thus in power measurement, apply precision high.
The second, the application provide in the circuit of voltage sample and signal condition because there is no coil and iron core, do not relate to and carry out transmission of signal with magnetic field, so can not cause non-linear because exciting current is too little, thus when minimum signal, there are the high linearity and precision.
3rd, the application provide in the circuit of voltage sample and signal condition, because adopt the resistance string of high value to input, input current is minimum, even input double even if significantly transship, resistance also can not obviously generate heat, and does not have iron core, there is not saturated situation, the linearity is also still constant.
4th, the application provide in the circuit of voltage sample and signal condition, resistance is high resistance to piezoresistance, and mechanization production, cost is low.Technological standards, reliability is high, there is not the problem of mutual inductor winding broken string.
5th, the application provide in the circuit of voltage sample and signal condition, because do not need variation magnetic field to be coupled, circuit of the present invention directly can be measured combined-voltage signal or superpose the AC signal of a large amount of flip-flop in exchanging, and there is not saturated drawback.
6th, the application provide in the circuit of voltage sample and signal condition, there is no coil and iron core, be subject to the interference of electromagnetic field hardly, therefore strong anti-interference performance.
7th, the resistance cost that the circuit for voltage sample and signal condition that the application provides needs is extremely low, and volume is little, and in prior art, mutual inductor is expensive, and volume is large, takies PCB surface long-pending large.
8th, the application in voltage sampling circuit adopt low-temperature coefficient resistance, high precision can be accomplished at wide temperature range.
9th, the circuit for voltage sample and signal condition that the application provides, can adopt single power supply, directly can use the reference power source Vref of ADC, without the need to extra circuit.
Tenth, the circuit for voltage sample and signal condition that the application provides, the input impedance of signal conditioning circuit is high, can meet the output of various employing circuit, and output impedance is extremely low, and carrying load ability is strong, can realize profound and negative feedbck, circuit stability; Output area is large, and output signal can relatively 0V; The precision of whole circuit depends on two resistance in signal conditioning circuit, and temperature limit is wide.
Those skilled in the art should understand, the embodiment of the application can be provided as method, device or computer program.Therefore, the application can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the application can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.
Above-mentioned explanation illustrate and describes some preferred embodiments of the application, but as previously mentioned, be to be understood that the application is not limited to the form disclosed by this paper, should not regard the eliminating to other embodiments as, and can be used for other combinations various, amendment and environment, and can in invention contemplated scope described herein, changed by the technology of above-mentioned instruction or association area or knowledge.And the change that those skilled in the art carry out and change do not depart from the spirit and scope of the application, then all should in the protection domain of the application's claims.
Claims (6)
1., for a circuit for voltage sample and signal condition, comprise voltage sampling circuit and signal conditioning circuit, described voltage sampling circuit is connected with described signal conditioning circuit, it is characterized in that,
Described voltage sampling circuit is used for carrying out dividing potential drop to high input ac voltage, and export low output AC voltage, comprise at least two resistance be connected in series, be respectively the first resistance and the second resistance, the first end of described first resistance as signal input part, for inputting alternating current-direct current signal or comprising the AC signal of flip-flop; Second end of described first resistance is connected with the first end of described second resistance, and this end is also connected to described signal conditioning circuit, as the voltage input end of described signal conditioning circuit; Second end ground connection of described second resistance;
Described signal conditioning circuit is used for output single-pole voltage, and comprise operational amplifier, the 3rd resistance and the 4th resistance, the first end of described 3rd resistance is connected to the second end of the first resistance described in described voltage sampling circuit, as described voltage input end; Second end of described 3rd resistance is connected to the in-phase input end of described operational amplifier; The first end of described 4th resistance is as the reference voltage input terminal of described signal conditioning circuit, and the second end of described 4th resistance is connected to the in-phase input end of described operational amplifier; The inverting input of described operational amplifier is connected to the output terminal of described operational amplifier, as the output terminal of described signal conditioning circuit; Two power ends of described operational amplifier, one end connects external power source, other end ground connection.
2., according to claim 1 for the circuit of voltage sample and signal condition, it is characterized in that,
The each resistance be connected in series in described voltage sampling circuit is high resistance measurement, and the resistance of described first resistance is 100K Ω-10M Ω, and the resistance of described second resistance is 1K Ω-100K Ω.
3., according to claim 1 for the circuit of voltage sample and signal condition, it is characterized in that,
The each resistance be connected in series in described voltage sampling circuit is high pressure resistant resistance.
4., according to claim 1 for the circuit of voltage sample and signal condition, it is characterized in that,
The each resistance be connected in series in described voltage sampling circuit is low-temperature coefficient resistance.
5., according to claim 5 for the circuit of voltage sample and signal condition, it is characterized in that,
The resistance of described 3rd resistance and described 4th resistance is equal.
6., according to claim 1 for the circuit of voltage sample and signal condition, it is characterized in that,
The resistance of described 3rd resistance and the 4th resistance is 10K Ω-500K Ω.
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| CN201510921274.9A CN105301335B (en) | 2015-12-12 | 2015-12-12 | It is a kind of for voltage sample and the circuit of signal condition |
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| CN201510921274.9A CN105301335B (en) | 2015-12-12 | 2015-12-12 | It is a kind of for voltage sample and the circuit of signal condition |
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| CN105301335B CN105301335B (en) | 2019-06-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106645905A (en) * | 2016-11-11 | 2017-05-10 | 大禹电气科技股份有限公司 | Output voltage isolation sampling circuit of high-voltage inverter |
| CN109861650A (en) * | 2019-02-27 | 2019-06-07 | 四川爱创科技有限公司 | The operational amplification circuit of adjustable reference voltage value |
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| CN106645905A (en) * | 2016-11-11 | 2017-05-10 | 大禹电气科技股份有限公司 | Output voltage isolation sampling circuit of high-voltage inverter |
| CN106645905B (en) * | 2016-11-11 | 2023-06-30 | 大禹电气科技股份有限公司 | Output voltage isolation sampling circuit of high-voltage frequency converter |
| CN109861650A (en) * | 2019-02-27 | 2019-06-07 | 四川爱创科技有限公司 | The operational amplification circuit of adjustable reference voltage value |
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| CN105301335B (en) | 2019-06-07 |
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