CN205176125U - Grid voltage input circuit that samples - Google Patents
Grid voltage input circuit that samples Download PDFInfo
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- CN205176125U CN205176125U CN201521002506.2U CN201521002506U CN205176125U CN 205176125 U CN205176125 U CN 205176125U CN 201521002506 U CN201521002506 U CN 201521002506U CN 205176125 U CN205176125 U CN 205176125U
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- voltage follower
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Abstract
The utility model provides a grid voltage input circuit that samples, including a voltage follower circuit unit, level lifting circuit unit, the 2nd voltage follower circuit unit and input protection circuit unit, wherein, the input connection grid voltage incoming signal of a voltage follower circuit unit, be suitable for the output impedance who reduces grid voltage incoming signal, level lifting circuit unit connects first voltage follower circuit unit, be suitable for the signal that will center on zero level fluctuation in the grid voltage incoming signal of voltage follower circuit unit output to promote to the unipolar signal, the 2nd voltage follower circuit unit is suitable for and carries out voltage to the unipolar signal through level lifting circuit unit output with grid voltage incoming signal and follow with reduction output impedance, protection circuit unit is suitable for the abnormal signal of filtration by the output of second voltage follower circuit unit, the utility model discloses can take care of grid voltage to make its requirement that can satisfy follow -up sampling.
Description
Technical field
The utility model relates to grid power technical field, particularly relates 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.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model 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 utility model 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 utility model at least has following beneficial effect: the utility model can be nursed 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, embodiment of the present utility model is described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present utility model and effect easily.The utility model 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 utility model.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 utility model in a schematic way, then only the assembly relevant with the utility model 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 utility model can be nursed 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 utility model effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the utility model discloses, must be contained by claim of the present utility model.
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 |
|---|---|---|---|
| CN201521002506.2U CN205176125U (en) | 2015-12-04 | 2015-12-04 | Grid voltage input circuit that samples |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521002506.2U CN205176125U (en) | 2015-12-04 | 2015-12-04 | Grid voltage input circuit that samples |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205176125U true CN205176125U (en) | 2016-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521002506.2U Expired - Fee Related CN205176125U (en) | 2015-12-04 | 2015-12-04 | Grid voltage input circuit that samples |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205176125U (en) |
Cited By (2)
| 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 |
| CN105334379A (en) * | 2015-12-04 | 2016-02-17 | 重庆臻远电气有限公司 | Network-voltage sampling input circuit |
-
2015
- 2015-12-04 CN CN201521002506.2U patent/CN205176125U/en not_active Expired - Fee Related
Cited By (2)
| 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 |
| CN105334379A (en) * | 2015-12-04 | 2016-02-17 | 重庆臻远电气有限公司 | Network-voltage sampling input circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20161204 |