CN207263800U - A kind of application DC offset voltage is in the device of AC sine wave signal source - Google Patents
A kind of application DC offset voltage is in the device of AC sine wave signal source Download PDFInfo
- Publication number
- CN207263800U CN207263800U CN201721141140.6U CN201721141140U CN207263800U CN 207263800 U CN207263800 U CN 207263800U CN 201721141140 U CN201721141140 U CN 201721141140U CN 207263800 U CN207263800 U CN 207263800U
- Authority
- CN
- China
- Prior art keywords
- resistance
- signal source
- sine wave
- operational amplifier
- integrated operational
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Amplifiers (AREA)
Abstract
A kind of application DC offset voltage be the utility model is related in the device of AC sine wave signal source, including signal source, capacitance, source resistance, resistance, feedback resistance, balance resistance, measured piece, integrated operational amplifier and phase inverter；First integrated operational amplifier, first, 3rd resistor, feedback resistance, balance resistance composition profound and negative feedbck, composition amplifier；Second integrated operational amplifier, the second source resistance, second resistance, the second capacitance composition profound and negative feedbck, form integrator.The utility model is based on integrated operational amplifier and forms profound and negative feedbck circuit, the principle for being zero to the unlimited integral result of AC sine wave signal using integrator, DC offset voltage can be accurately added to using common high-precision integrated operational amplifier on sine wave source, then form alternating current-direct current signal source.The circuit structure is simple and reliable, and circuit entirety complexity is low, easy to spread, has a good application prospect.
Description
Technical field
Electronic surveying and instrument field, especially alternating current-direct current signal source technical field are the utility model is related to, especially
Be it is a kind of application DC offset voltage in the device of AC sine wave signal source.
Background technology
Impedance is one of physical parameter important in electricity, with the development of Modem simulation and digital technology, LCR numeral electricity
Bridge becomes the mainstream of impedance measurement, it tests the impedance value of measured piece by applying the AC sine wave signal of certain frequency.
Need to apply DC offset voltage to measured piece in some specific occasions, then apply the impedance that AC sine wave signal measurement goes out
Value, could more accurately react feature of the measured piece in true application.
The method of the DC offset voltage of sine wave signal superposition at this stage is divided into two kinds, and one kind is direct method, such as Fig. 1 institutes
Show；Another kind is indirect method, as shown in Figure 2.Direct method is mainly used for test capacitors or to measuring accuracy field of less demanding
Close, its major advantage is that circuit structure is simple, and electronic component is few, and cost is relatively low, and shortcoming is that DC offset voltage easily holds
The influence of measured piece D.C. resistance, especially in the case of measurement resistance and inductance.Indirect method is amplified based on integrated computation
Device carries out anti-phase summation operation, and DC offset voltage is accurately loaded on measured piece, therefore this mode extensive use
In the more demanding occasion of measuring accuracy.Indirect method in the ideal case, operational amplifier U1, feedback resistance Rf1, input resistance
R1, balance resistance Rp are formed profound and negative feedbck, empty short establishment, so being applied on measured piece by core of operational amplifier U1
Voltage is
Integrated operational amplifier is there are the non-ideal index parameter such as temperature drift, offset voltage and offset current in reality, these
It will cause drift so as to have impact on the precision of DC offset voltage.Although by using low imbalance, Low Drift Temperature, high-precision collection
Reasonably select other components into operational amplifier, improve supply voltage stability, reduce variation of ambient temperature, suppress interference and
The measure such as noise, well-designed circuit board, can further improve the precision of DC offset voltage.But this may result in electricity
The complexity of road design greatly increases, the increase of product design time, the cost increase of circuit, very uneconomical；And because
The use condition of special integrated transporting discharging has limited, then the adaptability for also resulting in circuit is poor.
Utility model content
The technical problems to be solved in the utility model is：In order to overcome existing sine wave signal superposition DC offset voltage side
The deficiency of method, the utility model proposes a kind of application DC offset voltage in the device of AC sine wave signal source.
Technical solution is used by the utility model：A kind of application DC offset voltage is in AC sine wave signal source
Device, including the first signal source, secondary signal source, the first capacitance, the second capacitance, the first source resistance, the second source resistance, the first electricity
Resistance, second resistance, 3rd resistor, feedback resistance, balance resistance, measured piece, the first integrated operational amplifier, the second integrated computation
Amplifier and phase inverter；First integrated operational amplifier, first resistor, 3rd resistor, feedback resistance, balance resistance are with the first collection
Into operational amplifier a profound and negative feedbck, composition amplifier are constituted for core；Second integrated operational amplifier, second
Source resistance, second resistance, the second capacitance constitute a profound and negative feedbck by core of the second integrated operational amplifier, form product
Divide device.
Further, the utility model is in ac equivalent circuit, and proportional amplifier, integrator and phase inverter are with ratio
Amplifier constitutes profound and negative feedbck for core, and output of first signal source after proportional amplifier enlargement range is straight as handing over
Flow the output AC sine wave signal of signal source.
Further, the utility model is in pc equivalent circuit, and integrator, phase inverter and proportional amplifier are to integrate
Device constitutes profound and negative feedbck for core, empty short establishment, the in-phase input end potential of the second integrated operational amplifier with it is anti-phase defeated
Enter and hold potential equal, the DC voltage of signal source output terminal is equal with the output DC voltage in secondary signal source, and then direct current is inclined
Put voltage signal to be added to the output terminal of AC sine wave signal source, the DC offset voltage as the output of alternating current-direct current signal source
Signal.
Further, the utility model integrator is zero to the unlimited integral result of AC sine wave signal, to eliminate
Influence of the AC sine wave signal to DC offset voltage.
Further, the utility model is provided with expansion current circuit in the output terminal of the first integrated operational amplifier, can be with
The output current intensity of DC offset voltage is improved, strengthens the load capacity of DC offset voltage.
Further say, the utility model：First signal source is AC sine wave signal source, and secondary signal source is direct current
Biasing voltage signal source, the first capacitance are coupled capacitor, and the first source resistance is AC sine wave signal source output resistance, the second source
Resistance is DC bias signal source output resistance, and the second capacitance is integrating capacitor, and first resistor is defeated for integrated operational amplifier
Enter resistance, second resistance is the input resistance of the second integrated operational amplifier, and 3rd resistor is the output resistance of phase inverter, is fed back
Resistance is the negative feedback resistor of the first integrated operational amplifier, and balance resistance is the in-phase input end of the first integrated operational amplifier
Input resistance.
The beneficial effects of the utility model are：Profound and negative feedbck circuit is formed based on integrated operational amplifier, utilizes integration
The principle that device is zero to the unlimited integral result of AC sine wave signal, can be by directly using common high-precision integrated operational amplifier
Stream bias voltage is accurately added on sine wave source, then forms alternating current-direct current signal source.The circuit structure is simple and reliable,
Circuit entirety complexity is low, easy to spread, has a good application prospect.
Brief description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is direct iteration method schematic diagram；
Fig. 2 is indirect addition method schematic diagram；
Fig. 3 is the circuit diagram of the utility model device；
Fig. 4 is the ac equivalent circuit figure of the utility model device；
Fig. 5 is the pc equivalent circuit figure of the utility model device；
Fig. 6 is sine wave integration schematic diagram；
Fig. 7 is the ac equivalent circuit simplification figure of the utility model device.
Embodiment
The utility model is described in further detail presently in connection with attached drawing and preferred embodiment.These attached drawings are letter
The schematic diagram of change, only illustrates the basic structure of the utility model in a schematic way, thus its only show it is related with the utility model
Composition.
As shown in figure 3, a kind of application DC offset voltage is in the device of AC sine wave signal source, including AC sine wave
Signal source Vs1, DC offset voltage signal source Vs2, source resistance Rs1, source resistance Rs2, coupled capacitor C1, integrating capacitor C2, electricity
Hinder R1, resistance R2, resistance R3, feedback resistance Rf1, balance resistance Rp, measured piece DUT, integrated operational amplifier U1, integrated computation
Amplifier U2 and phase inverter U3.
AC sine wave signal source Vs1 one end connects one end of source resistance Rs1, and AC sine wave signal source Vs1's is another
End connection reference ground, one end of the other end connection coupled capacitor C1 of source resistance Rs1, the other end connection resistance of coupled capacitor C1
One end of other end connection feedback resistance Rf1 of R1, resistance R1 and the inverting input of integrated operational amplifier U1, integrated computation
One end of the in-phase input end connection balance resistance Rp of amplifier U1, the other end connection reference ground of balance resistance Rp, integrates fortune
Calculate the other end of the output terminal connection feedback resistance Rf1 of amplifier U1, one end of resistance R2 and one end of measured piece DUT, resistance
The inverting input of other end connection integrated operational amplifier U2 of R2 and one end of integrating capacitor C2, measured piece DUT's is another
End connection reference ground, one end of the in-phase input end connection source resistance Rs2 of integrated operational amplifier U2, source resistance Rs2's is another
The positive ends of end connection DC offset voltage signal source Vs2, the negative polarity end of DC offset voltage signal source Vs2 is connected to ginseng
Examine ground, the other end of output terminal connection integrating capacitor C2 and the input terminal of phase inverter U3 of integrated operational amplifier U2, phase inverter
One end of the output terminal connection resistance R2 of U3, the inverting input of the other end connection integrated operational amplifier U1 of resistance R2.
AC sine wave signal source Vs1 produces AC sine wave signal, and it is inclined that DC offset voltage signal source Vs2 produces direct current
Put voltage signal；Profound and negative feedbck, resistance R1, feedback resistance Rf1, balance resistance are formed by core of integrated operational amplifier U1
Rp and integrated operational amplifier U1 proportion of composing amplifiers；Profound and negative feedbck is formed by core of integrated operational amplifier U2, electricity
Hinder R2, integrating capacitor C2, source resistance Rs2, DC offset voltage signal source Vs2 and integrated operational amplifier U2 composition integrators.
Ac equivalent circuit, as shown in figure 4, the output signal of AC sine wave signal source Vs1 is put by proportional amplifier
Output AC sine wave signal of the output as alternating current-direct current signal source after significantly.
Pc equivalent circuit, as shown in figure 5, for the empty short establishments of integrated operational amplifier U2, integrated operational amplifier U2
In-phase input end potential it is equal with inverting input potential, so the DC voltage of signal source output terminal and direct current biasing electricity
Press the output DC voltage of signal source Vs2 equal, then DC offset voltage Signal averaging to the defeated of AC sine wave signal source
Outlet, the DC offset voltage signal as the output of alternating current-direct current signal source.
Because integrator is zero to the unlimited integral result of AC sine wave signal, the exchange of signal source output terminal is just
String ripple signal does not influence DC offset voltage, DC offset voltage signal and the output DC voltage phase in secondary signal source
Deng, then formed alternating current-direct current signal source.
Operation principle：
If the output Vs1=Asin (wt) for the AC sine wave signal that the first signal source Vs1 is produced, A are the width of sine wave
Degree, w are the angular frequency of sine wave, and the DC offset voltage signal that secondary signal source Vs2 is produced is Vs2=Vdc；Rs1 is first
The internal resistance of signal source Vs1, Rs2 are the internal resistance of secondary signal source Vs2.
The ac equivalent circuit of the utility model, as shown in Figure 4, is located at voltage sample point A, AC sine wave signal
The exchange output of generation is Uac, and the output end voltage of the second integrated operational amplifier U2 is U2o,
Because resistance R2, capacitance C2, integrated operational amplifier form integrator, integrated operational amplifier U2 in-phase input ends
Pass through resistance eutral grounding, U2P=U2N=0 is " virtual earth ".
In circuit, electric current i in capacitance C2c2Equal to the electric current i for flowing through resistance R2R2That is ic2=iR2,
Voltage U on the output voltage U2o and capacitance C2 of U2C2Relation be U2o=UC2, therefore
In t1To t2The integrated value of period is
U2o (t in formula1) to integrate the output voltage of initial time, it is zero herein, the final voltage of integration is t2Moment
Output voltage.
When from t1To t2When time is endless,
As shown in fig. 6, integration meaning be equivalent to amplitude and time product area and, because sine wave is on a timeline
It is lower symmetrical, so unlimited long-time integration equivalent area is zero.
Then, unlimited long-time ∞ integrations are equivalent in the utility model practical application to sine wave signal integration,
It can further obtain, phase inverter output equivalent voltage is zero,
So the utility model ac equivalent circuit can further simplify, as shown in fig. 7,
Then, the exchange that AC sine wave signal produces, which exports, is
Because integrator is zero to the unlimited integral result of AC sine wave signal, the direct current of the utility model is equivalent
Circuit, as shown in figure 5, setting the DC voltage of voltage sample point A outputs as Udc.
Because integrated operational amplifier U1, integrated operational amplifier U2, phase inverter U3, resistance R1, resistance R2, feedback resistance
Rf1, capacitance C2 constitute a profound and negative feedbck with integrated operational amplifier U2,
So for integrated operational amplifier U2, empty short establishment, the anti-phase input terminal voltage U2 of integrated operational amplifier U2N
With homophase input terminal voltage U2PIt is equal,
So U2N=U2P=Vs2=Vdc...... (6)
To be fed back according to depth, during circuit balancing, it is zero to flow through the DC current on resistance R2, can then be obtained,
The DC offset voltage of alternating current-direct current signal source is Udc=U2N=Vs2=Vdc... (7)
Further, the output U of alternating current-direct current signal source is
In conclusion a kind of DC offset voltage that applies of the utility model is in the method and dress of AC sine wave signal source
Put, profound and negative feedbck circuit is formed based on integrated operational amplifier, the unlimited integration using integrator to AC sine wave signal
As a result it is zero principle, alternating current-direct current signal source is formd on sine wave source that DC offset voltage is accurately added to.
Simply specific embodiment of the present utility model described in description above, various illustrations are not to this practicality
New substantive content is construed as limiting, and person of an ordinary skill in the technical field can be to former institute after specification has been read
The embodiment stated is made an amendment or is deformed, without departing from the spirit and scope of utility model.
Claims (6)
1. a kind of application DC offset voltage is in the device of AC sine wave signal source, it is characterised in that：Including the first signal source,
Secondary signal source, the first capacitance, the second capacitance, the first source resistance, the second source resistance, first resistor, second resistance, the 3rd electricity
Resistance, feedback resistance, balance resistance, measured piece, the first integrated operational amplifier, the second integrated operational amplifier and phase inverter；The
One integrated operational amplifier, first resistor, 3rd resistor, feedback resistance, balance resistance are using the first integrated operational amplifier as core
The heart constitutes a profound and negative feedbck, composition amplifier；Second integrated operational amplifier, the second source resistance, second resistance,
Second capacitance constitutes a profound and negative feedbck by core of the second integrated operational amplifier, forms integrator.
2. a kind of application DC offset voltage as claimed in claim 1 exists in the device of AC sine wave signal source, its feature
In：In ac equivalent circuit, it is anti-that proportional amplifier, integrator and phase inverter using proportional amplifier as core constitute deep negative
Feedback, output of first signal source after proportional amplifier enlargement range are believed as the output AC sine wave of alternating current-direct current signal source
Number.
3. a kind of application DC offset voltage as claimed in claim 1 exists in the device of AC sine wave signal source, its feature
In：In pc equivalent circuit, integrator, phase inverter and proportional amplifier constitute profound and negative feedbck by core of integrator, empty
Short establishment, the in-phase input end potential of the second integrated operational amplifier is equal with inverting input potential, signal source output terminal
DC voltage is equal with the output DC voltage in secondary signal source, and then DC offset voltage Signal averaging to AC sine wave is believed
The output terminal in number source, the DC offset voltage signal as the output of alternating current-direct current signal source.
4. a kind of application DC offset voltage is in the device of AC sine wave signal source, its feature as claimed in claim 2 or claim 3
It is：Integrator is zero to the unlimited integral result of AC sine wave signal.
5. a kind of application DC offset voltage as claimed in claim 1 exists in the device of AC sine wave signal source, its feature
In：The output terminal of first integrated operational amplifier is provided with expansion current circuit.
6. a kind of application DC offset voltage as claimed in claim 1 exists in the device of AC sine wave signal source, its feature
In：First signal source is AC sine wave signal source, and secondary signal source is DC offset voltage signal source, and the first capacitance is coupling
Capacitance, the first source resistance are AC sine wave signal source output resistance, and the second source resistance is DC bias signal source output resistance,
Second capacitance is integrating capacitor, and first resistor is the input resistance of integrated operational amplifier, and second resistance is the second integrated computation
The input resistance of amplifier, 3rd resistor are the output resistance of phase inverter, and feedback resistance is the negative of the first integrated operational amplifier
Feedback resistance, balance resistance are the in-phase input end input resistance of the first integrated operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721141140.6U CN207263800U (en) | 2017-09-06 | 2017-09-06 | A kind of application DC offset voltage is in the device of AC sine wave signal source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721141140.6U CN207263800U (en) | 2017-09-06 | 2017-09-06 | A kind of application DC offset voltage is in the device of AC sine wave signal source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207263800U true CN207263800U (en) | 2018-04-20 |
Family
ID=61920177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721141140.6U Active CN207263800U (en) | 2017-09-06 | 2017-09-06 | A kind of application DC offset voltage is in the device of AC sine wave signal source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207263800U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449949A (en) * | 2017-09-06 | 2017-12-08 | 常州同惠电子股份有限公司 | Apply DC offset voltage in the device of AC sine wave signal source |
| CN109188099A (en) * | 2018-09-12 | 2019-01-11 | 湖南宝德机电设备有限公司 | A kind of liquid electric conductivity detection system |
| CN110702978A (en) * | 2019-11-05 | 2020-01-17 | 中电科仪器仪表有限公司 | Device and method for measuring direct current bias voltage on small signal |
| CN113075431A (en) * | 2021-03-19 | 2021-07-06 | 常州同惠电子股份有限公司 | Signal source generating circuit and signal source generating method for alternating current impedance test |
-
2017
- 2017-09-06 CN CN201721141140.6U patent/CN207263800U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107449949A (en) * | 2017-09-06 | 2017-12-08 | 常州同惠电子股份有限公司 | Apply DC offset voltage in the device of AC sine wave signal source |
| CN107449949B (en) * | 2017-09-06 | 2023-06-27 | 常州同惠电子股份有限公司 | Device for applying DC bias voltage to AC sine wave signal source |
| CN109188099A (en) * | 2018-09-12 | 2019-01-11 | 湖南宝德机电设备有限公司 | A kind of liquid electric conductivity detection system |
| CN109188099B (en) * | 2018-09-12 | 2021-03-26 | 湖南宝德机电设备有限公司 | Liquid conductivity detection system |
| CN110702978A (en) * | 2019-11-05 | 2020-01-17 | 中电科仪器仪表有限公司 | Device and method for measuring direct current bias voltage on small signal |
| CN113075431A (en) * | 2021-03-19 | 2021-07-06 | 常州同惠电子股份有限公司 | Signal source generating circuit and signal source generating method for alternating current impedance test |
| CN113075431B (en) * | 2021-03-19 | 2023-01-06 | 常州同惠电子股份有限公司 | Signal source generating circuit and signal source generating method for alternating current impedance test |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207263800U (en) | A kind of application DC offset voltage is in the device of AC sine wave signal source | |
| CN107449949A (en) | Apply DC offset voltage in the device of AC sine wave signal source | |
| CN101149391A (en) | Differential capacitance type sensor detection circuit | |
| CN205427032U (en) | Weak signal detection device based on phase -locked loop | |
| CN105548710B (en) | A kind of enhanced autobalance bridge and its method for realizing impedance measurement | |
| CN104267244B (en) | A kind of integration ratio circuit and the impedance measurement method based on integration ratio circuit | |
| CN107209211A (en) | Electronic integrator for Rogowsky coil sensor | |
| CN102435859B (en) | Small capacitance measurement circuit based on AC (alternating current) voltage drop balance and measurement method | |
| CN204832352U (en) | Little measurement of capacitance appearance of phase -delay total mark | |
| CN207866886U (en) | A kind of magnetic modulator current sensing means | |
| Malik et al. | AN-Z2V: Autonulling-based multimode signal conditioning circuit for RC sensors | |
| CN104155521A (en) | Method and apparatus for determining phase difference | |
| Yang | A self-balancing circuit to measure capacitance and loss conductance for industrial transducer applications | |
| CN106154053A (en) | A kind of detection chip of the weak capacitive realized based on carrier modulation and phase demodulation | |
| CN104569610B (en) | A kind of tiny differential capacitance measuring circuit | |
| US3694741A (en) | Coupled inductance impedance measuring circuit with increased sensitivity and frequency independence | |
| Atmanand et al. | A novel method of measurement of L and C | |
| CN204944423U (en) | A kind of capacitive MEMS sensor detection circuit | |
| US4723449A (en) | Electromagnetic flowmeters | |
| CN106199285A (en) | The arbitrarily capacitance characteristic under AC carrier measures equipment and measuring method thereof | |
| CN103197153B (en) | A kind of capacitor and inductor parameter measurement circuit based on vector triangle and measuring method thereof | |
| CN114113781A (en) | Frequency measuring circuit of power system | |
| CN105004259A (en) | Capacitive MEMS sensor detection circuit | |
| CN205142180U (en) | Simulation phase discrimination circuit | |
| CN220323429U (en) | LCR measuring circuit based on codec chip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |