CN105301335B - It is a kind of for voltage sample and the circuit of signal condition - Google Patents
It is a kind of for voltage sample and the circuit of signal condition Download PDFInfo
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Abstract
This application discloses a kind of for voltage sample and the circuit of signal condition, including voltage sampling circuit and signal conditioning circuit, voltage sampling circuit includes first resistor and second resistance, the first end of first resistor is as signal input part, the second end of first resistor and the first end of second resistance connect, which is also connected to signal conditioning circuit；The second end of second resistance is grounded；Signal conditioning circuit is used for output single-pole voltage, includes operational amplifier, 3rd resistor and the 4th resistance, and the first end of 3rd resistor is connected to the second end of first resistor in voltage sampling circuit, and second end is connected to the non-inverting input terminal of operational amplifier；Reference voltage input terminal of the first end of 4th resistance as signal conditioning circuit, second end are connected to the non-inverting input terminal of operational amplifier；The inverting input terminal of operational amplifier is connected to the output end of operational amplifier；The power end of operational amplifier, one end connect external power supply, other end ground connection.
Description
Technical field
This application involves field of circuit technology, specifically, being related to a kind of for voltage sample and the circuit of signal condition.
Background technique
Currently, in transformation and distribution system used in producing and live at us, alternating voltage sampling circuit is various exchanges
Indispensable part in measuring device.
Currently used AC voltage sampling mainly include the following types:
(1) voltage transformer (PT) circuit, working principle referring to fig. 4, have the disadvantage in that
A) certain phase shift can be generated to voltage sample waveform, that is to say, that will cause the angular difference of mutual inductor, and this
Angular difference also occurs that variation in entire range, will result in Accuracy of Power Measurement reduction in this way；
B) measurement range is narrow, when low-voltage inputs, is influenced by exciting current reduction, precision can reduce；
C) input overload capacity is poor, and when input voltage is excessively high, voltage transformer can seriously generate heat and then damage；
D) due to using iron core and copper wire, encapsulating, high labor cost are also wanted, so volume is big, it is at high cost；
E) there is superfine enameled wire coiling in, need resin encapsulating, temperature change or welding and easily broken string, reliability
It is low, technique is required high；
F) because be mutual inductor structure, it is not capable of measuring DC voltage and the voltage containing flip-flop, otherwise mutual inductor is just
It can be saturated, it is final to damage；
G) interference by electromagnetic field is easy come work by electromagnetic induction, electromagnetism interference performance is poor；
H) temperature coefficient is big, cannot do the measurement of wide-range high-accuracy.
(2) small current mutual inductor (CT) of 1:1 has the disadvantage in that referring to Fig. 5
A) certain phase shift can be generated to voltage sample waveform, that is to say, that will cause the angular difference of mutual inductor, and this
Angular difference also occurs that variation in entire range, will result in measurement accuracy reduction in this way；
B) it when low-voltage inputs, is influenced by exciting current reduction, precision can reduce；
C) input overload capacity it is poor, when input voltage is excessively high, the resistance and voltage transformer of concatenation can seriously generate heat into
And it damages；
D) it needs in current transformer (CT) secondary side and connects a sampling resistor that electric current is transformed into voltage signal, and connect
Resistance can further deteriorate the angular difference of voltage signal, further the measuring accuracy of power is impacted, keeps power accurate
Degree reduces.
E) there is superfine enameled wire coiling in, need resin encapsulating, temperature change or welding are easily broken, reliability
It is low, technique is required high；
F) input range of this current transformer is about 0~2.5mA, and line voltage is about 400V in low-pressure system
Left and right, at this time series resistor and the energy of mutual inductor and secondary resistance consumption are very considerable, waste electric energy, simultaneously as
It generates heat larger, life of product shortens, and circuit is easy failure；
G) because be mutual inductor structure, it is not capable of measuring DC voltage and the voltage containing flip-flop, otherwise mutual inductor is just
It can be saturated, it is final to damage；
H) interference by electromagnetic field is easy come work by electromagnetic induction, electromagnetism interference performance is poor；
I) due to using iron core and copper wire, encapsulating, high labor cost are also wanted, so volume is big, it is at high cost；
J) temperature coefficient is big, cannot do the measurement of wide-range high-accuracy.
Currently used signal conditioning circuit mainly include the following types:
(1) amplifier add circuit has the disadvantage in that referring to Fig. 6
A) need positive-negative power to power, cannot directly use converter a reference source Vref, need with an amplifier with
Several resistance generate a negative Vref；
B) this circuit form input impedance is not high enough, in conjunction with the signal internal resistance of front, brings certain mistake to measurement
Difference；And since this circuit cannot lead to too low input impedance because of reduction output impedance, big measurement is further resulted in
Error directly connects adc circuit meeting generation time problem, influences the standard of voltage and power measurement so this circuit output impedance is high
Exactness；
C) this circuit amplifier output impedance is high, and it is poor that band loads with loading capability, causes circuit output range small；And entire circuit
Complexity, at high cost, poor reliability more using amplifier and precision resistance.
(2) capacitive coupling see-saw circuit has the disadvantage in that referring to Fig. 7
A) it is coupled using electrolytic capacitor, performance is influenced by capacitance and material, and temperature influences point solution capacitor
Capacity and service life；
B) this circuit form input impedance is not high enough, in conjunction with the singal source resistance of front, brings to measurement certain
Error；And amplifier output impedance is high, so carrying load ability is poor, causes circuit output range small；It is more using precision resistance, at
This height；
C) this circuit cannot lead to too low input impedance because of reduction output impedance, further result in big measurement
Error directly connects adc circuit meeting generation time problem, influences the standard of voltage and power measurement so this circuit output impedance is high
Exactness.
Summary of the invention
In view of this, the technical problem to be solved by the application is to provide a kind of for voltage sample and signal condition
Circuit can directly measure the swin flu signal for being superimposed a large amount of flip-flops in combined-voltage signal or exchange, have high line
Property and precision, high reliablity, strong anti-interference performance.
In order to solve the above-mentioned technical problem, the application has following technical solution:
It is a kind of for voltage sample and the circuit of signal condition, including voltage sampling circuit and signal conditioning circuit are described
Voltage sampling circuit is connected with the signal conditioning circuit, which is characterized in that
The voltage sampling circuit exports low output AC voltage for dividing to high input ac voltage, wraps
The resistance being connected in series containing at least two, respectively first resistor and second resistance, the first end of the first resistor is as letter
Number input terminal, for inputting alternating current-direct current signal or comprising the AC signal of flip-flop；The second end of the first resistor and institute
The first end connection of second resistance is stated, which is also connected to the signal conditioning circuit, the electricity as the signal conditioning circuit
Press input terminal；The second end of the second resistance is grounded；
The signal conditioning circuit be used for output single-pole voltage, include operational amplifier, 3rd resistor and the 4th resistance,
The first end of the 3rd resistor is connected to the second end of first resistor described in the voltage sampling circuit, as the voltage
Input terminal；The second end of the 3rd resistor is connected to the non-inverting input terminal of the operational amplifier；The of 4th resistance
Reference voltage input terminal of the one end as the signal conditioning circuit, the second end of the 4th resistance are connected to the operation and put
The non-inverting input terminal of big device；The inverting input terminal of the operational amplifier is connected to the output end of the operational amplifier, as
The output end of the signal conditioning circuit；Two power ends of the operational amplifier, one end connect external power supply, another termination
Ground.
Preferably, in which:
Each resistance being connected in series in the voltage sampling circuit is high resistance measurement, and the resistance value of the first resistor is
100K Ω -10M Ω, the resistance value of the second resistance are 1K Ω -100K Ω.
Preferably, in which:
Each resistance being connected in series in the voltage sampling circuit is high pressure resistant resistance.
Preferably, in which:
Each resistance being connected in series in the voltage sampling circuit is low-temperature coefficient resistance.
Preferably, in which:
The 3rd resistor and the resistance value of the 4th resistance are equal.
Preferably, in which:
The 3rd resistor and the resistance value of the 4th resistance are 10K Ω -500K Ω.
Compared with prior art, method described herein achieving the following effects:
First, provided herein is used in the circuit of voltage sample and signal condition, and resistance is resistive load, is avoided
Because angular difference caused by the inductance characteristic of mutual inductor, circuit of the present invention do not have angular difference, thus the essence in terms of power measurement
Degree is high.
Second, provided herein is used in the circuit of voltage sample and signal condition, because without coil and iron core,
Be not related to transmitting signal with magnetic field, thus will not due to exciting current too it is small cause it is non-linear, thus in minimum signal,
There are the high linearity and precision.
Third, provided herein is used in the circuit of voltage sample and signal condition, because using the electricity of high value
Resistance string inputs, and input current is minimum, even if substantially overload even inputs double, resistance will not obviously generate heat, without iron core,
The case where there is no saturations, the linearity is also still constant.
4th, provided herein is used in the circuit of voltage sample and signal condition, and resistance is high voltage resistance, machine
Tool metaplasia produces, at low cost.The problem of technological standards, high reliablity, there is no mutual inductor winding broken strings.
5th, provided herein is used in the circuit of voltage sample and signal condition, because not needing variation magnetic field
Coupling, circuit of the present invention can directly measure the exchange letter that a large amount of flip-flops are superimposed in combined-voltage signal or exchange
Number, there is no be saturated.
6th, provided herein is used in the circuit of voltage sample and signal condition, without coil and iron core, almost
The interference of electromagnetic field, therefore strong anti-interference performance are not will receive.
7th, the resistance cost needed for the circuit of voltage sample and signal condition provided herein is extremely low, body
Product is small, and mutual inductor is expensive in the prior art, and volume is big, and it is big to occupy PCB surface product.
8th, the application in voltage sampling circuit use low-temperature coefficient resistance, can accomplish in wide temperature range
High precision.
9th, single supply power supply can be used in the circuit for being used for voltage sample and signal condition provided herein, can be straight
The reference power source Vref using ADC is met, without additional circuit.
Tenth, the circuit for being used for voltage sample and signal condition provided herein, the input resistance of signal conditioning circuit
Resist high, the various outputs using circuit can be met, and output impedance is extremely low, carrying load ability is strong, can be realized deep negative
Feedback, circuit stability；Output area is big, and output signal can relatively 0V；The precision of entire circuit depends on signal condition electricity
Two resistance in road, temperature limit are wide.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is in the embodiment of the present invention 1 for voltage sample and a kind of composition schematic diagram of the circuit of signal condition；
Fig. 2 is in the embodiment of the present invention 2 for voltage sample and a kind of composition schematic diagram of the circuit of signal condition；
Fig. 3 is in the embodiment of the present invention 3 for voltage sample and a kind of composition schematic diagram of the circuit of signal condition；
Fig. 4 is the composition schematic diagram of voltage transformer (PT) circuit in the prior art；
Fig. 5 is the composition schematic diagram of the small current mutual inductor (CT) of 1:1 in the prior art；
Fig. 6 is the composition schematic diagram of amplifier add circuit in the prior art；
Fig. 7 is the composition schematic diagram of capacitive coupling see-saw circuit in the prior art.
Specific embodiment
As used some vocabulary to censure specific components in the specification and claims.Those skilled in the art answer
It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims are not with name
The difference of title is as the mode for distinguishing component, but with the difference of component functionally as the criterion of differentiation.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer within the acceptable error range, those skilled in the art can within a certain error range solve described in
Technical problem basically reaches the technical effect.In addition, " coupling " word includes any direct and indirect electric property coupling herein
Means.Therefore, if it is described herein that a first device is coupled to a second device, then representing the first device can directly electrical coupling
It is connected to the second device, or the second device indirectly electrically coupled through other devices or coupling means.Specification
Subsequent descriptions be implement the application better embodiment, so it is described description be for the purpose of the rule for illustrating the application,
It is not intended to limit the scope of the present application.The protection scope of the application is as defined by the appended claims.
Embodiment 1
It is shown in Figure 1 to be herein described a kind of for voltage sample and the composition schematic diagram of the circuit of signal condition,
For voltage sample and the circuit of signal condition, including voltage sampling circuit and signal conditioning circuit, the electricity in the present embodiment
Pressure sample circuit is connected with the signal conditioning circuit, and the voltage sampling circuit is for dividing high input ac voltage
Pressure, and exports low output AC voltage, the resistance being connected in series comprising two, respectively first resistor R1 and second resistance R2,
The first end of the first resistor R1 is as signal input part 1, for inputting alternating current-direct current signal or comprising the exchange of flip-flop
Signal；The second end of the first resistor R1 is connect with the first end of the second resistance R2, which is also connected to the signal
Conditioning circuit, the voltage input end Vin as the signal conditioning circuit；The second end of the second resistance R2 is grounded；
The signal conditioning circuit is used for output single-pole voltage, includes operational amplifier, the electricity of 3rd resistor R3 and the 4th
R4 is hindered, the first end of the 3rd resistor R3 is connected to the second end of first resistor R1 described in the voltage sampling circuit, makees
For the voltage input end Vin；The second end of the 3rd resistor R3 is connected to the non-inverting input terminal 2 of the operational amplifier；
The first end of the 4th resistance R4 reference voltage input terminal Vref as the signal conditioning circuit, the 4th resistance R4
Second end be connected to the non-inverting input terminal 2 of the operational amplifier；The inverting input terminal 3 of the operational amplifier is connected to institute
The output end for stating operational amplifier, the output end vo ut as the signal conditioning circuit；Two electricity of the operational amplifier
Source, one end connect external power supply, other end ground connection.
Each resistance being connected in series in voltage sampling circuit in Fig. 1 is high resistance measurement, the resistance of the first resistor R1
Value is 100K Ω -10M Ω, and the resistance value of the second resistance R2 is 1K Ω -100K Ω.It is inputted using the resistance string of high value,
Input current is minimum, even if substantially overload even inputs double, resistance will not obviously generate heat, and without iron core, there is no saturations
The case where, the linearity is still constant.
Each resistance being connected in series in voltage sampling circuit in Fig. 1 is high pressure resistant resistance, so as to realize mechanization
The problem of production, at low cost, technological standards, high reliablity, there is no mutual inductor winding broken strings.
Each resistance being connected in series in voltage sampling circuit in Fig. 1 be 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 resistance value of the 3rd resistor and the 4th resistance in signal conditioning circuit in Fig. 1 is equal, can be taken as 10K Ω -500K
Ω therefore by 3rd resistor and the 4th resistance sum to obtain voltage to be (Vin+Vout)/2 by sampled voltage and reference voltage Vref,
This voltage exports Vout by operational amplifier, and the electric polarity that Vout is is unipolarity, therefore can enter unipolar A/D and carry out
Analog-digital Converter, since amplifier works in follower state, so have minimum output impedance, strongest carrying load ability,
Maximum output area.These characteristics are that traditional circuit is not had, and due to not having mutual inductor sample, this circuit
Voltage signal comprising flip-flop can also be measured.
The present invention realizes the friendship pressed alternating current-direct current galvanic electricity and comprising flip-flop from sample circuit to signal conditioning circuit
Galvanic electricity pressure carries out high-acruracy survey, provides possibility for the power and electric energy measurement of exchange high-precision power or electric energy instrument.And
And simple circuit of the present invention, high reliablity, use temperature range are wide, cost is but more at low cost than traditional circuit.
Embodiment 2
The present invention is for can be used embodiment shown in Fig. 2 also in the circuit of voltage sample and signal condition to realize.With
Embodiment illustrated in fig. 1 is compared, and 5 resistance, the 5th resistance R5, the 6th resistance R6, are in series in the voltage sampling circuit in Fig. 2
Seven resistance R7, the 8th resistance R8 and the 9th resistance R9 are sequentially connected in series, and one end of the 5th resistance R5 is used for as signal input part 1
Input alternating current-direct current signal or the AC signal comprising flip-flop；8th resistance R8 also connects with the one end being connected the 9th resistance R9
It is connected to signal conditioning circuit, the voltage input end Vin as signal conditioning circuit；The other end of 9th resistance R9 is grounded.
Embodiment 3
The present invention is for can be used embodiment shown in Fig. 2 also in the circuit of voltage sample and signal condition to realize.With
Fig. 1 is compared with embodiment illustrated in fig. 2, and the voltage sampling circuit in Fig. 3 is in series with 4 resistance, resistance R10, resistance R11, resistance
R12 and resistance R13 are sequentially connected in series, the first end of resistance R10 as signal input part 1, for input alternating current-direct current signal or comprising
The AC signal of flip-flop；Resistance R11 is also connected to signal conditioning circuit with the one end being connected resistance R12, as signal
The voltage input end Vin of conditioning circuit；One end of resistance R13 is grounded.
As can be seen from the above embodiments beneficial effect existing for the application is:
First, provided herein is used in the circuit of voltage sample and signal condition, and resistance is resistive load, is avoided
Because of angular difference caused by the inductance characteristic of mutual inductor, circuit of the present invention does not have angular difference, to answer in terms of power measurement
With precision height.
Second, provided herein is used in the circuit of voltage sample and signal condition, because without coil and iron core,
Be not related to transmitting signal with magnetic field, thus will not due to exciting current too it is small cause it is non-linear, thus in minimum signal,
There are the high linearity and precision.
Third, provided herein is used in the circuit of voltage sample and signal condition, because using the electricity of high value
Resistance string inputs, and input current is minimum, even if substantially overload even inputs double, resistance will not obviously generate heat, without iron core,
The case where there is no saturations, the linearity is also still constant.
4th, provided herein is used in the circuit of voltage sample and signal condition, and resistance is high voltage resistance, machine
Tool metaplasia produces, at low cost.The problem of technological standards, high reliablity, there is no mutual inductor winding broken strings.
5th, provided herein is used in the circuit of voltage sample and signal condition, because not needing variation magnetic field
Coupling, circuit of the present invention can directly measure the exchange letter that a large amount of flip-flops are superimposed in combined-voltage signal or exchange
Number, there is no be saturated.
6th, provided herein is used in the circuit of voltage sample and signal condition, without coil and iron core, almost
The interference of electromagnetic field, therefore strong anti-interference performance are not will receive.
7th, the resistance cost needed for the circuit of voltage sample and signal condition provided herein is extremely low, body
Product is small, and mutual inductor is expensive in the prior art, and volume is big, and it is big to occupy PCB surface product.
8th, the application in voltage sampling circuit use low-temperature coefficient resistance, can accomplish in wide temperature range
High precision.
9th, single supply power supply can be used in the circuit for being used for voltage sample and signal condition provided herein, can be straight
The reference power source Vref using ADC is met, without additional circuit.
Tenth, the circuit for being used for voltage sample and signal condition provided herein, the input resistance of signal conditioning circuit
Resist high, the various outputs using circuit can be met, and output impedance is extremely low, carrying load ability is strong, can be realized deep negative
Feedback, circuit stability；Output area is big, and output signal can relatively 0V；The precision of entire circuit depends on signal condition electricity
Two resistance in road, temperature limit are wide.
It should be understood by those skilled in the art that, embodiments herein can provide as method, apparatus or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
Above description shows and describes several preferred embodiments of the present application, but as previously described, it should be understood that the application
Be not limited to forms disclosed herein, should not be regarded as an exclusion of other examples, and can be used for various other combinations,
Modification and environment, and the above teachings or related fields of technology or knowledge can be passed through within that scope of the inventive concept describe herein
It is modified.And changes and modifications made by those skilled in the art do not depart from spirit and scope, then it all should be in this Shen
It please be in the protection scope of appended claims.
Claims (6)
1. it is a kind of for voltage sample and the circuit of signal condition, including voltage sampling circuit and signal conditioning circuit, the electricity
Pressure sample circuit is connected with the signal conditioning circuit, which is characterized in that
The voltage sampling circuit exports low output AC voltage for dividing to high input ac voltage, comprising extremely
The resistance of few two series connections, respectively first resistor and second resistance, the first end of the first resistor are defeated as signal
Enter end, for inputting alternating current-direct current signal or comprising the AC signal of flip-flop；The second end of the first resistor and described the
The first end of two resistance connects, and the second end of the first resistor is also connected to the signal conditioning circuit, as the signal
The voltage input end of conditioning circuit；The second end of the second resistance is grounded；
The signal conditioning circuit is used for output single-pole voltage, described comprising operational amplifier, 3rd resistor and the 4th resistance
The first end of 3rd resistor is connected to the second end of first resistor described in the voltage sampling circuit, as the voltage input
End；The second end of the 3rd resistor is connected to the non-inverting input terminal of the operational amplifier；The first end of 4th resistance
As the reference voltage input terminal of the signal conditioning circuit, the second end of the 4th resistance is connected to the operational amplifier
Non-inverting input terminal；The inverting input terminal of the operational amplifier is connected to the output end of the operational amplifier, as described
The output end of signal conditioning circuit；Two power ends of the operational amplifier, one end connect external power supply, and the other end is grounded,
The circuit of the voltage sample and signal condition is powered using single supply.
2. according to claim 1 for voltage sample and the circuit of signal condition, which is characterized in that
Each resistance being connected in series in the voltage sampling circuit is high resistance measurement, and the resistance value of the first resistor is 100K
Ω -1OM Ω, the resistance value of the second resistance are 1K Ω -100K Ω.
3. according to claim 1 for voltage sample and the circuit of signal condition, which is characterized in that
Each resistance being connected in series in the voltage sampling circuit is high pressure resistant resistance.
4. according to claim 1 for voltage sample and the circuit of signal condition, which is characterized in that
Each resistance being connected in series in the voltage sampling circuit is low-temperature coefficient resistance.
5. according to claim 1 for voltage sample and the circuit of signal condition, which is characterized in that
The 3rd resistor and the resistance value of the 4th resistance are equal.
6. according to claim 1 for voltage sample and the circuit of signal condition, which is characterized in that
The 3rd resistor and the resistance value of the 4th resistance are 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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| 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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| CN201774453U (en) * | 2010-08-26 | 2011-03-23 | Bcd半导体制造有限公司 | Power supply voltage detection circuit of switching power supply |
| CN202160142U (en) * | 2011-08-03 | 2012-03-07 | 重庆瑜欣平瑞电子有限公司 | Output alternating current voltage sampling circuit of portable generator inverter |
| CN205450078U (en) * | 2015-12-12 | 2016-08-10 | 北京易艾斯德科技有限公司 | A circuit for voltage sample and signal conditioning |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58135466A (en) * | 1982-02-08 | 1983-08-12 | Toshiba Corp | Detecting circuit of power supply voltage |
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| CN201774453U (en) * | 2010-08-26 | 2011-03-23 | Bcd半导体制造有限公司 | Power supply voltage detection circuit of switching power supply |
| CN202160142U (en) * | 2011-08-03 | 2012-03-07 | 重庆瑜欣平瑞电子有限公司 | Output alternating current voltage sampling circuit of portable generator inverter |
| CN205450078U (en) * | 2015-12-12 | 2016-08-10 | 北京易艾斯德科技有限公司 | A circuit for voltage sample and signal conditioning |
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