CN203178344U - Direct current voltage signal acquisition circuit - Google Patents
Direct current voltage signal acquisition circuit Download PDFInfo
- Publication number
- CN203178344U CN203178344U CN 201320147846 CN201320147846U CN203178344U CN 203178344 U CN203178344 U CN 203178344U CN 201320147846 CN201320147846 CN 201320147846 CN 201320147846 U CN201320147846 U CN 201320147846U CN 203178344 U CN203178344 U CN 203178344U
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- China
- Prior art keywords
- operational amplifier
- resistance
- resistor
- acquisition circuit
- voltage signal
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Abstract
The utility model discloses a direct current voltage signal acquisition circuit. The circuit comprises a first operational amplifier and a second operational amplifier. A sampling signal of an external sensor is connected with an inverting input terminal of the first operational amplifier through a first resistor and a second resistor which are connected in series. An output terminal of the first operational amplifier is connected with the inverting input terminal of the second operational amplifier through a third resistor. The output terminal of the second operational amplifier outputs a signal to the outside world through a fourth resistor. An in-phase input terminal of the first operational amplifier is grounded through a fifth resistor. The output terminal of a first arithmetic device is connected with the inverting input terminal through a seventh resistor. The in-phase input terminal of the second operational amplifier is grounded through a sixth resistor. The output terminal of the second operational amplifier is connected with the inverting input terminal through a eighth resistor. A front end of the first resistor is grounded through a ninth resistor. A rear end of the first resistor is grounded through a first capacitor. By using the circuit of the utility model, a modulated and input direct current voltage sampling signal can be amplified. The structure is simple and usage is convenient.
Description
Technical field
The utility model relates to a kind of signal acquisition circuit, relates in particular to a kind of d. c. voltage signal Acquisition Circuit of falling damage device for multiple goal.
Background technology
Saving energy and decreasing loss is operated in the construction of electrical network and the operational process very important, satisfies to reduce electric energy loss under the situation of social power demands and have long-range meaning.
It is a kind of novel power electronic equipment that damage device falls in multiple goal, and it combines two current transformers of series, parallel, and whether the compensation performance of its design direct relation auto levelizer realizes that the selection of parameter had both influenced the manufacturing cost that compensation quality also is related to equipment.How to be optimized design and to realize that physically the power electronic equipment of this new structure is a research work with positive effect.At voltage fall, current harmonics and power quality problem such as idle, in time, accurately detect and real-Time Compensation is crucial, determined the superiority of this device performance.This not only requirement to select suitable detection and control algolithm, hardware circuit is also had higher requirements, mainly comprise links such as signals collecting, compensation rate detection, signal output.
The utility model content
The utility model provides a kind of d. c. voltage signal Acquisition Circuit, can amplify the DC voltage sampled signal of modulation input, and simple in structure, easy to use.
The utility model adopts following technical scheme to realize:
A kind of d. c. voltage signal Acquisition Circuit, wherein comprise first operational amplifier, second operational amplifier, the sampled signal of external sensor is connected with the inverting input of second resistance with described first operational amplifier by first resistance of series connection, the output terminal of described first operational amplifier is connected with the inverting input of second operational amplifier by the 3rd resistance, and the output terminal of described second operational amplifier passes through the 4th resistance to external output signal.
Above-mentioned d. c. voltage signal Acquisition Circuit, the in-phase input end of wherein said first operational amplifier is by the 5th resistance eutral grounding; The output terminal of described first arithmetic device connects its inverting input by the 7th resistance.
Above-mentioned d. c. voltage signal Acquisition Circuit, the input end in the same way of wherein said second operational amplifier is by the 6th resistance eutral grounding; The output terminal of described second operational amplifier connects its inverting input by the 8th resistance.
Above-mentioned d. c. voltage signal Acquisition Circuit, the front end of wherein said first resistance is by the 9th resistance eutral grounding; The rear end of described first resistance is by first capacity earth.
Above-mentioned d. c. voltage signal Acquisition Circuit, the rear end of wherein said the 4th resistance is by second capacity earth.
The utlity model has following good effect:
The utility model DC voltage Acquisition Circuit has been carried out effective electrical isolation with high-pressure section and the control section of voltage sensor sampled signal; Operational amplifier good wave filtering effect in the circuit; The reverse amplification circuit that arranges in the circuit can be by changing corresponding resistance realization to the adjusting of output voltage signal scope; The utility model comprises two operational amplifiers, and is simple in structure, easy to use.
Description of drawings
Fig. 1 is the circuit diagram of a kind of d. c. voltage signal Acquisition Circuit of the utility model.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferable specific embodiment in detail, the utility model is further elaborated.
As shown in Figure 1, a kind of d. c. voltage signal Acquisition Circuit of the utility model comprises the first operational amplifier U1, the second operational amplifier U2, the sampled signal of external sensor is connected with the inverting input of the described first operational amplifier U1 with second resistance R 2 by first resistance R 1 of series connection, the output terminal of the first operational amplifier U1 is connected with the inverting input of the second operational amplifier U2 by the 3rd resistance R 3, and the output terminal of the second operational amplifier U2 passes through the 4th resistance R 4 to external output signal.
The in-phase input end of the first operational amplifier U1 is by the 5th resistance R 5 ground connection.The output terminal of first arithmetic device U1 connects its inverting input by the 7th resistance R 7.In the present embodiment, the positive supply input end 1 of the first operational amplifier U1 is connected with+15V voltage, and its negative supply input end 2 is connected with-15V voltage.
The input end in the same way of the second operational amplifier U2 is by the 6th resistance R 6 ground connection.The output terminal of the second operational amplifier U2 connects its inverting input by the 8th resistance R 8.
The front end of first resistance R 1 is by the 9th resistance R 9 ground connection.The rear end of first resistance R 1 is by first capacitor C, 1 ground connection.
The rear end of the 4th resistance is by second capacitor C, 2 ground connection.
The DC voltage sampled signal of external sensor input is imported the inverting input of the first operational amplifier U1, its output signal is modulated by negative feedback and its input signal and is amplified the back by the inverting input of the 3rd resistance R 3 inputs second operational amplifier U2, and the output signal of the second operational amplifier U2 is modulated amplification by negative feedback and its input signal and outwards exported by the 4th resistance R 4.
In the present embodiment, d. c. voltage signal adopts the LV28-P sensor of LEM company to sample, and its sampled signal is imported first resistance R 1, and sampled signal is outwards output after the utility model d. c. voltage signal Acquisition Circuit is amplified and is modulated in 0 ~ 4V scope.
Outside DC bus-bar voltage signal is imported the utility model d. c. voltage signal Acquisition Circuit behind voltage sensor, secondary current signal is converted to voltage signal through the 9th resistance R 9, and through the first operational amplifier U1 and the second operational amplifier U2 filtering, oppositely amplify and filtering after deliver to outside A/D conversion chip sampling channel.
The utility model DC voltage Acquisition Circuit has been carried out effective electrical isolation with high-pressure section and the control section of voltage sensor sampled signal; Operational amplifier good wave filtering effect in the circuit; The reverse amplification circuit that arranges in the circuit can be by changing corresponding resistance realization to the adjusting of output voltage signal scope.
The utility model can amplify the DC voltage sampled signal of modulation input, and simple in structure, easy to use.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be apparent.Therefore, protection domain of the present utility model should be limited to the appended claims.
Claims (5)
1. d. c. voltage signal Acquisition Circuit, it is characterized in that, comprise first operational amplifier (U1), second operational amplifier (U2), the sampled signal of external sensor is connected with the inverting input of second resistance (R2) with described first operational amplifier (U1) by first resistance (R1) of series connection, the output terminal of described first operational amplifier (U1) is connected with the inverting input of second operational amplifier (U2) by the 3rd resistance (R3), and the output terminal of described second operational amplifier (U2) passes through the 4th resistance (R4) to external output signal.
2. d. c. voltage signal Acquisition Circuit as claimed in claim 1 is characterized in that, the in-phase input end of described first operational amplifier (U1) is by the 5th resistance (R5) ground connection; The output terminal of described first arithmetic device (U1) connects its inverting input by the 7th resistance (R7).
3. d. c. voltage signal Acquisition Circuit as claimed in claim 2 is characterized in that, the input end in the same way of described second operational amplifier (U2) is by the 6th resistance (R6) ground connection; The output terminal of described second operational amplifier (U2) connects its inverting input by the 8th resistance (R8).
4. d. c. voltage signal Acquisition Circuit as claimed in claim 3 is characterized in that, the front end of described first resistance (R1) is by the 9th resistance (R9) ground connection; The rear end of described first resistance (R1) is by first electric capacity (C1) ground connection.
5. d. c. voltage signal Acquisition Circuit as claimed in claim 4 is characterized in that, the rear end of described the 4th resistance is by second electric capacity (C2) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320147846 CN203178344U (en) | 2013-03-28 | 2013-03-28 | Direct current voltage signal acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320147846 CN203178344U (en) | 2013-03-28 | 2013-03-28 | Direct current voltage signal acquisition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203178344U true CN203178344U (en) | 2013-09-04 |
Family
ID=49075022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320147846 Expired - Lifetime CN203178344U (en) | 2013-03-28 | 2013-03-28 | Direct current voltage signal acquisition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203178344U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353558A (en) * | 2016-08-26 | 2017-01-25 | 成都鑫豪斯电子探测技术有限公司 | The co-signal processor of inductive load and resistive load used for electrical fire supervision |
-
2013
- 2013-03-28 CN CN 201320147846 patent/CN203178344U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353558A (en) * | 2016-08-26 | 2017-01-25 | 成都鑫豪斯电子探测技术有限公司 | The co-signal processor of inductive load and resistive load used for electrical fire supervision |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130904 |