CN201615923U - Alternating current voltage measuring circuit - Google Patents
Alternating current voltage measuring circuit Download PDFInfo
- Publication number
- CN201615923U CN201615923U CN2009201799980U CN200920179998U CN201615923U CN 201615923 U CN201615923 U CN 201615923U CN 2009201799980 U CN2009201799980 U CN 2009201799980U CN 200920179998 U CN200920179998 U CN 200920179998U CN 201615923 U CN201615923 U CN 201615923U
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- CN
- China
- Prior art keywords
- amplifying circuit
- voltage
- alternating current
- circuit
- input end
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- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to an alternating current voltage measuring circuit, which comprises an input end, a first amplifying circuit and a second amplifying circuit. The input end generates low voltage alternating current signals through two resistors by means of voltage dividing, the low voltage alternating current signals are input to a negative input end of the first amplifying circuit and a positive input end of the second amplifying circuit, and output ends of the first amplifying circuit and the second amplifying circuit are respectively connected with a diode. The alternating current measuring method adopts fewer elements which are all miniature devices, and the whole circuit has very small volume and low price, and obtains better effects in practical use.
Description
Technical field:
The utility model has related to a kind of alternating current voltage measuring circuit.
Background technology:
In various power supply treatment facilities, requisite during ac voltage measurement.Using maximum to the measurement of alternating voltage now is to adopt voltage sensor to measure alternating voltage, converts 220 volts alternating voltages to DC voltage that 0-5 lies prostrate by voltage sensor.Because the general volume of voltage sensor is bigger, price is also expensive, and therefore this measuring method generally is to be used in the medium-and-large-sized equipment.And on some microminiature instrument and meters owing to be subjected to the influence of volume and price, just can not measure alternating voltage by the working voltage sensor.
Summary of the invention:
In order to solve the problems of the technologies described above, the utility model provides a kind of alternating current voltage measuring circuit.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of alternating current voltage measuring circuit, comprise that input end passes through two electric resistance partial pressures and produces the low-voltage AC signal, the low-voltage AC signal inputs to the negative input end of first amplifying circuit and the positive input terminal on second largest discharge road, and the output terminal of described first amplifying circuit and second amplifying circuit links to each other with a diode respectively.
The employed component number of the measuring method of the utility model alternating voltage is less, and all is microdevice, and the entire circuit volume is very little, and is cheap, has obtained effect preferably in actual applications.
Description of drawings:
The utility model is described in further detail below in conjunction with drawings and Examples.
Accompanying drawing is the circuit diagram of utility model.
Among the figure: 1, first amplifying circuit; 2, second amplifying circuit 3, dividing potential drop stake resistance; 4, divider resistance
Embodiment:
A kind of as shown in drawings alternating current voltage measuring circuit, the A end is ac voltage input, come dividing potential drop by dividing potential drop stake resistance R1 and divider resistance R2, obtain the ac voltage signal of low-voltage at the B end, then the ac voltage signal of low-voltage is sent into first amplifying circuit 1 and second amplifying circuit 2, be used to amplify the low-voltage AC signal of B end.The signal of first amplifying circuit 1 is input as the negative terminal input, and the output signal after therefore amplifying is anti-phase in input signal, and the signal of first amplifying circuit 1 is input as the anode input, and the output signal homophase after therefore amplifying is in input signal.When the ac voltage signal of B end is positive half cycle, the first not output of amplifying circuit 1, second amplifying circuit 2 has the amplifying signal output of positive half cycle, this output signal is by diode D2 rectification, obtain the DC voltage of a 0-5 volt at the C end, the size of DC voltage is proportional to the size of alternating voltage substantially, therefore by measuring the DC voltage of c end, just can calculate A hold ac voltage.When alternating voltage was negative half period, the ac voltage signal of B end also was a negative half period, and first amplifying circuit 1 has output signal, the second not output of amplifying circuit 2.The output signal of first amplifying circuit 1 is by diode D1 rectification, holds to such an extent that also can obtain the DC voltage of a 0-5 volt at C.In sum, no matter be at the positive half cycle of alternating voltage or at negative half period, amplify through operational amplifier, behind diode D1, the D2 rectification, all can obtain a dc voltage value, and become certain ratio with ac voltage at the C end.Therefore just can obtain the input end ac voltage by measuring the C terminal voltage.
Claims (1)
1. alternating current voltage measuring circuit, it is characterized in that: described alternating current voltage measuring circuit comprises that input end passes through dividing potential drop stake resistance (3) and divider resistance (4) produces the low-voltage AC signal, the low-voltage AC signal inputs to the negative input end of first amplifying circuit (1) and the positive input terminal of second amplifying circuit (2), and the output terminal of described first amplifying circuit (1) and second amplifying circuit (2) links to each other with a diode respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201799980U CN201615923U (en) | 2009-12-08 | 2009-12-08 | Alternating current voltage measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201799980U CN201615923U (en) | 2009-12-08 | 2009-12-08 | Alternating current voltage measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201615923U true CN201615923U (en) | 2010-10-27 |
Family
ID=43002290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201799980U Expired - Fee Related CN201615923U (en) | 2009-12-08 | 2009-12-08 | Alternating current voltage measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201615923U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788895A (en) * | 2011-05-18 | 2012-11-21 | 富泰华工业（深圳）有限公司 | Alternating voltage detection circuit |
| CN105425022A (en) * | 2015-12-18 | 2016-03-23 | 顺德职业技术学院 | Simple detection circuit for mains voltage |
| CN106645903A (en) * | 2017-03-03 | 2017-05-10 | 福建星网视易信息系统有限公司 | Detection method and system for multi-channel alternating current strong current signal |
-
2009
- 2009-12-08 CN CN2009201799980U patent/CN201615923U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788895A (en) * | 2011-05-18 | 2012-11-21 | 富泰华工业（深圳）有限公司 | Alternating voltage detection circuit |
| CN105425022A (en) * | 2015-12-18 | 2016-03-23 | 顺德职业技术学院 | Simple detection circuit for mains voltage |
| CN106645903A (en) * | 2017-03-03 | 2017-05-10 | 福建星网视易信息系统有限公司 | Detection method and system for multi-channel alternating current strong current signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101027 Termination date: 20101208 |