CN105334379A - Network-voltage sampling input circuit - Google Patents
Network-voltage sampling input circuit Download PDFInfo
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- CN105334379A CN105334379A CN201510888592.XA CN201510888592A CN105334379A CN 105334379 A CN105334379 A CN 105334379A CN 201510888592 A CN201510888592 A CN 201510888592A CN 105334379 A CN105334379 A CN 105334379A
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- circuit unit
- voltage
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- voltage follower
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
Abstract
The invention provides a network-voltage sampling input circuit. The network-voltage sampling input circuit comprises a first voltage follower circuit unit, a level raising circuit unit, a second voltage follower circuit unit and an input protection circuit unit. The input of the first voltage follower circuit unit is connected with network-voltage input signals, and the first voltage follower circuit unit is suitable for reducing the output impedance of the network-voltage input signals. The level raising circuit unit is connected with the first voltage follower circuit unit and is suitable for raising the signals, fluctuating around the zero level, in the network-voltage input signals output by the first voltage follower circuit unit into uni-polarity signals. The second voltage follower circuit unit is suitable for carrying out voltage following on the uni-polarity signals output by the level raising circuit unit and the network-voltage input signals to reduce the output impedance. The protection circuit unit is suitable for filtering out abnormal signals output by the second voltage follower circuit unit. By means of the network-voltage sampling input circuit, the network voltage can be regulated, and therefore the network voltage can meet follow sampling requirements.
Description
Technical field
The present invention relates to grid power technical field, particularly relate to a kind of line voltage circuit of sampling input.
Background technology
When the alternating voltage exported Alternative Voltage Converter carries out AD sampling, output voltage due to AC transformer is 0-5V, and sampling A/D chip is 0-3V to the voltage request of input signal, therefore, need to nurse one's health the signal in input sample chip, to meet sampling request, thus provide more stable and effective sampled signal, to ensure the synchronizing signal process of line voltage.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of line voltage circuit of sampling input, for solving in prior art to the line voltage problem that input signal is stable not when sampling.
For achieving the above object and other relevant objects, the invention provides following technical scheme:
A kind of line voltage circuit of sampling input, comprise the first voltage follower circuit unit, level lifting circuit unit, second voltage follower circuit unit and input protection circuit unit, wherein, the input of the first voltage follower circuit unit connects line voltage input signal, be suitable for the output impedance reducing line voltage input signal, level lifting circuit unit connects the first voltage follower circuit unit, the signal boost be suitable for fluctuating around zero level in the line voltage input signal exported through the first voltage follower circuit unit is unipolar signal, second voltage follower circuit unit connects level lifting circuit unit, be suitable for carrying out voltage follow to reduce output impedance to the unipolar signal exported through level lifting circuit unit and line voltage input signal, protection circuit unit connects the second voltage follower circuit unit, be suitable for filtering the abnormal signal exported by the second voltage follower circuit unit.
Preferably, first voltage follower circuit unit is made up of resistance R1, resistance R2 and electric capacity C1 and operational amplifier U1, wherein, one end of resistance R1 connects line voltage input signal, the other end connects the inverting input of the positive pole operational amplifier U1 of electric capacity C1 respectively, the negative pole difference ground connection of electric capacity C1 and the in-phase input end of concatenation operation amplifier U1, the output terminal of operational amplifier U1 passes through the inverting input of resistance R2 concatenation operation amplifier U1.
Preferably, level lifting circuit unit is made up of resistance R3 and resistance R4, and one end of resistance R3 connects a lifting voltage, and the other end is by the output terminal of resistance R2 concatenation operation amplifier U1 and connect the second voltage follower circuit unit.
Preferably; second voltage follower circuit unit is made up of operational amplifier U2; wherein; the in-phase input end of operational amplifier U2 connects level lifting circuit unit; the output terminal of operational amplifier U2 inverting input concatenation operation amplifier U2, the output terminal of operational amplifier U2 connects input protection circuit unit.
Preferably; input protection circuit unit is made up of diode D1, diode D2 and electric capacity C2; wherein; the negative pole of diode D1 connects a supply voltage; the cathode connecting diode D2 negative pole of diode D1 also connects the output terminal of operational amplifier U2 in the second voltage follower circuit unit by a resistance R5; the plus earth of diode D2, and electric capacity C2 is connected in the two ends of diode D2 in parallel.
Preferably, operational amplifier U1 and operational amplifier U2 is operational amplifier chip LF353.
As mentioned above, the present invention at least has following beneficial effect: the present invention can nurse one's health line voltage, thus the requirement of subsequent sampling can be met, and the undesired signal that may affect sampling in line voltage is suppressed and got rid of, ensure that the safety and stability of subsequent sampling.
Accompanying drawing explanation
Fig. 1 is shown as a kind of schematic diagram of line voltage circuit of sampling input.
Fig. 2 is shown as the concrete implementing circuit figure of one of line voltage circuit of sampling input.
Element numbers explanation
10 first voltage follower circuit unit
20 level lifting circuit units
30 second voltage follower circuit unit
40 input protection circuit unit
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.It should be noted that, when not conflicting, the feature in following examples and embodiment can combine mutually.
It should be noted that, the diagram provided in following examples only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
When the alternating voltage exported Alternative Voltage Converter carries out AD sampling, output voltage due to AC transformer is 0-5V, and sampling A/D chip is 0-3V to the voltage request of input signal, therefore, need to nurse one's health the signal in input sample chip, to meet sampling request, thus provide more stable and effective sampled signal, to ensure the synchronizing signal process of line voltage.
Embodiment 1
Refer to Fig. 1, for a kind of schematic diagram of line voltage circuit of sampling input, as shown in the figure, this line voltage circuit of sampling input comprises the first voltage follower circuit unit 10, level lifting circuit unit 20, second voltage follower circuit unit 30 and input protection circuit unit 40, wherein, the input of the first voltage follower circuit unit 10 connects line voltage input signal, be suitable for the output impedance reducing line voltage input signal, level lifting circuit unit 20 connects the first voltage follower circuit unit 10, the signal boost be suitable for fluctuating around zero level in the line voltage input signal exported through the first voltage follower circuit unit 10 is unipolar signal, second voltage follower circuit unit 30 connects level lifting circuit unit 20, be suitable for carrying out voltage follow to reduce output impedance to the unipolar signal exported through level lifting circuit unit 20 and line voltage input signal, protection circuit unit connects the second voltage follower circuit unit 30, be suitable for filtering the abnormal signal exported by the second voltage follower circuit unit 30.
As shown in Figure 2, the concrete implementing circuit figure of one for line voltage circuit of sampling input, as shown in the figure, the first voltage follower circuit unit 10 can be formed by resistance R1, resistance R2 and electric capacity C1 and operational amplifier U1, wherein, one end of resistance R1 connects line voltage input signal, the other end connects the inverting input of the positive pole operational amplifier U1 of electric capacity C1 respectively, the negative pole difference ground connection of electric capacity C1 and the in-phase input end of concatenation operation amplifier U1, the output terminal of operational amplifier U1 passes through the inverting input of resistance R2 concatenation operation amplifier U1.
In addition, the one end that can form level lifting circuit unit 20, resistance R3 by resistance R3 and resistance R4 connects a lifting voltage, and the other end is by the output terminal of resistance R2 concatenation operation amplifier U1 and connect the second voltage follower circuit unit 30.
In addition; the second voltage follower circuit unit 30 can be formed by operational amplifier U2; wherein; the in-phase input end of operational amplifier U2 connects level lifting circuit unit 20; the output terminal of operational amplifier U2 inverting input concatenation operation amplifier U2, the output terminal of operational amplifier U2 connects input protection circuit unit 40.
Finally; input protection circuit unit 40 can be formed by diode D1, diode D2 and electric capacity C2; wherein the negative pole of diode connects a supply voltage (3.3V); the cathode connecting diode D2 negative pole of diode D1 also connects the output terminal of operational amplifier U2 in the second voltage follower circuit unit 30 by a resistance R5; the plus earth of diode D2, and electric capacity C2 is connected in the two ends of diode D2 in parallel.
In concrete enforcement, the resistance of resistance R1 is 10K, and the capacitance of electric capacity C1 is 0.01uF, and the two forms a filtering circuit, makes the time constant of its filter unit circuit much smaller than the output frequency of system, thus error can be made to ignore.In addition, resistance R2, resistance R3, the resistance of resistance R4 is 10K, and the resistance of resistance R5 is 1K.
In addition, operational amplifier U1 and operational amplifier U2 preferably adopts operational amplifier chip LF353, and the capacitance of electric capacity C2 is also preferably 0.01uF, and its effect is for suppressing interference.Wherein, the effect of resistance R1 is also to suppress interference.
In sum, the present invention can nurse one's health line voltage, thus can meet the requirement of subsequent sampling, and suppresses the undesired signal that may affect sampling in line voltage and get rid of, and ensure that the safety and stability of subsequent sampling.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (6)
1. a line voltage circuit of sampling input, it is characterized in that: comprise the first voltage follower circuit unit, level lifting circuit unit, second voltage follower circuit unit and input protection circuit unit, wherein, the input of the first voltage follower circuit unit connects line voltage input signal, be suitable for the output impedance reducing line voltage input signal, level lifting circuit unit connects the first voltage follower circuit unit, the signal boost be suitable for fluctuating around zero level in the line voltage input signal exported through the first voltage follower circuit unit is unipolar signal, second voltage follower circuit unit connects level lifting circuit unit, be suitable for carrying out voltage follow to reduce output impedance to the unipolar signal exported through level lifting circuit unit and line voltage input signal, protection circuit unit connects the second voltage follower circuit unit, be suitable for filtering the abnormal signal exported by the second voltage follower circuit unit.
2. line voltage circuit of sampling input according to claim 1, it is characterized in that: the first voltage follower circuit unit is made up of resistance R1, resistance R2 and electric capacity C1 and operational amplifier U1, wherein, one end of resistance R1 connects line voltage input signal, the other end connects the inverting input of the positive pole operational amplifier U1 of electric capacity C1 respectively, the negative pole difference ground connection of electric capacity C1 and the in-phase input end of concatenation operation amplifier U1, the output terminal of operational amplifier U1 passes through the inverting input of resistance R2 concatenation operation amplifier U1.
3. line voltage circuit of sampling input according to claim 2, it is characterized in that: level lifting circuit unit is made up of resistance R3 and resistance R4, one end of resistance R3 connects a lifting voltage, and the other end is by the output terminal of resistance R2 concatenation operation amplifier U1 and connect the second voltage follower circuit unit.
4. line voltage circuit of sampling input according to claim 3; it is characterized in that: the second voltage follower circuit unit is made up of operational amplifier U2; wherein; the in-phase input end of operational amplifier U2 connects level lifting circuit unit; the output terminal of operational amplifier U2 inverting input concatenation operation amplifier U2, the output terminal of operational amplifier U2 connects input protection circuit unit.
5. line voltage circuit of sampling input according to claim 4; it is characterized in that: input protection circuit unit is made up of diode D1, diode D2 and electric capacity C2; wherein; the negative pole of diode D1 connects a supply voltage; the cathode connecting diode D2 negative pole of diode D1 also connects the output terminal of operational amplifier U2 in the second voltage follower circuit unit by a resistance R5; the plus earth of diode D2, and electric capacity C2 is connected in the two ends of diode D2 in parallel.
6. line voltage circuit of sampling input according to claim 5, is characterized in that: operational amplifier U1 and operational amplifier U2 is operational amplifier chip LF353.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510888592.XA CN105334379A (en) | 2015-12-04 | 2015-12-04 | Network-voltage sampling input circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510888592.XA CN105334379A (en) | 2015-12-04 | 2015-12-04 | Network-voltage sampling input circuit |
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| CN105334379A true CN105334379A (en) | 2016-02-17 |
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| CN201510888592.XA Pending CN105334379A (en) | 2015-12-04 | 2015-12-04 | Network-voltage sampling input circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334380A (en) * | 2015-12-04 | 2016-02-17 | 重庆臻远电气有限公司 | Network voltage sampling input circuit |
| CN106249178A (en) * | 2016-09-05 | 2016-12-21 | 东莞市旺达富自动化设备有限公司 | A kind of alternating current parameter detection and aging testing system |
| CN109061279A (en) * | 2018-07-19 | 2018-12-21 | 帝森克罗德集团有限公司 | Alternating current sampling circuit |
| CN112730969A (en) * | 2021-01-19 | 2021-04-30 | 刘龙丰 | Medical instrument sampling circuit for isolation detection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102735917A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Voltage acquisition circuit for digital signal processor (DSP) |
| CN105334380A (en) * | 2015-12-04 | 2016-02-17 | 重庆臻远电气有限公司 | Network voltage sampling input circuit |
| CN205176124U (en) * | 2015-12-04 | 2016-04-20 | 重庆臻远电气有限公司 | Grid voltage input circuit that samples |
| CN205176125U (en) * | 2015-12-04 | 2016-04-20 | 重庆臻远电气有限公司 | Grid voltage input circuit that samples |
-
2015
- 2015-12-04 CN CN201510888592.XA patent/CN105334379A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735917A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Voltage acquisition circuit for digital signal processor (DSP) |
| CN105334380A (en) * | 2015-12-04 | 2016-02-17 | 重庆臻远电气有限公司 | Network voltage sampling input circuit |
| CN205176124U (en) * | 2015-12-04 | 2016-04-20 | 重庆臻远电气有限公司 | Grid voltage input circuit that samples |
| CN205176125U (en) * | 2015-12-04 | 2016-04-20 | 重庆臻远电气有限公司 | Grid voltage input circuit that samples |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334380A (en) * | 2015-12-04 | 2016-02-17 | 重庆臻远电气有限公司 | Network voltage sampling input circuit |
| CN106249178A (en) * | 2016-09-05 | 2016-12-21 | 东莞市旺达富自动化设备有限公司 | A kind of alternating current parameter detection and aging testing system |
| CN109061279A (en) * | 2018-07-19 | 2018-12-21 | 帝森克罗德集团有限公司 | Alternating current sampling circuit |
| CN109061279B (en) * | 2018-07-19 | 2024-01-09 | 帝森克罗德集团有限公司 | AC sampling circuit |
| CN112730969A (en) * | 2021-01-19 | 2021-04-30 | 刘龙丰 | Medical instrument sampling circuit for isolation detection |
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Application publication date: 20160217 |
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