CN205176117U - Synchronous sampling circuit - Google Patents
Synchronous sampling circuit Download PDFInfo
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- CN205176117U CN205176117U CN201521004318.3U CN201521004318U CN205176117U CN 205176117 U CN205176117 U CN 205176117U CN 201521004318 U CN201521004318 U CN 201521004318U CN 205176117 U CN205176117 U CN 205176117U
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- sampling circuit
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Abstract
The utility model provides a synchronous sampling circuit, including resistance R1, electric capacity C1, comparator U1, resistance R2, resistance R3 and electric capacity C2, wherein, resistance R1's one end counts the line voltage, electric capacity C1's positive pole is connected to resistance R1's the other end, electric capacity C1's minus earth, electric capacity C1's positive pole in comparator U1's the non -inverting input end connection filtering element circuit, comparator U1's inverting input end is through resistance R2 ground connection, electric capacity C2's positive pole is connected to comparator U1's output, electric capacity C2's anodal connecting resistance R3's one end, a pull -up voltage is connected to resistance R3's the other end, electric capacity C2's minus earth, the utility model discloses utilize this circuit to grid voltage's processing, realize effective filtering of grid voltage, have characteristics such as the error is little to provide reliable grid voltage synchronization signal for the system.
Description
Technical field
The utility model relates to grid power technical field, particularly relates to a kind of synchronized sampling circuit.
Background technology
Along with the development of reactive power compensation technology, Distribution Static Compensator (DSTATCOM), as a kind of important device in custom power technology, has become the focus of modern stationary reactive power compensation technology research.From the principle of work of DSTATCOM, when output voltage vector and the line voltage vector magnitude equal and opposite in direction of inverter, when direction is identical, current flowing is not had in linked reactor, and DSTATCOM is operated in perception or capacitive state all can control by regulating the angle of above two vectors, the amplitude of voltage vector that inverter exports and the adjustment in direction are all with the amplitude of line voltage and direction as a reference, therefore, the stationary problem of system voltage and line voltage just seems particularly important.
We know, line voltage synchronizing signal is the synchronous important leverage realizing line voltage, and how to provide a kind of line voltage synchronizing circuit obtain a reliable line voltage synchronizing signal just become those skilled in the art need solve problem.
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 synchronized sampling circuit, for providing a reliable line voltage synchronizing signal for system.
For achieving the above object and other relevant objects, the utility model provides following technical scheme:
A kind of synchronized sampling circuit, comprise resistance R1, electric capacity C1, comparer U1, resistance R2, resistance R3 and electric capacity C2, wherein, one end of resistance R1 counts line voltage, the other end of resistance R1 connects the positive pole of electric capacity C1, the minus earth of electric capacity C1, the normal phase input end of comparer U1 connects the positive pole of electric capacity C1 in filter unit circuit, the inverting input of comparer U1 is by resistance R2 ground connection, the output terminal of comparer U1 connects the positive pole of electric capacity C2, one end of the positive pole contact resistance R3 of electric capacity C2, the other end of resistance R3 connects pull-up voltage on, the minus earth of electric capacity C2.
Preferably, also comprise phase inverter G1 and phase inverter G2, phase inverter G1 and phase inverter G2 is connected in series successively on the positive pole of electric capacity C2.
Preferably, the resistance value of resistance R1 is 1k.
Preferably, the capacitance of electric capacity C1 is 15pF.
Preferably, comparer U1 is the integrated chip of comparer LM311.
Preferably, the resistance value of resistance R2 is 10k.
Preferably, the resistance value of resistance R3 is 110k.
Preferably, the capacitance of electric capacity C2 is 15pF.
Preferably, upper pull-up voltage can be the voltage of+5V.
As mentioned above, the utility model at least has following beneficial effect: utilize this circuit to the process of line voltage, realizes effective filtering of line voltage, has the features such as error is little, thus provides reliable line voltage synchronizing signal for system.
Accompanying drawing explanation
Fig. 1 is shown as a kind of schematic diagram of synchronized sampling circuit.
Fig. 2 is shown as a concrete implementing circuit schematic diagram of synchronized sampling circuit.
Element numbers explanation
10 filter unit circuit
20 voltage comparison unit circuit
30 pull-up clamp circuits
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.
See Fig. 1, give a kind of schematic diagram of synchronized sampling circuit, as shown in the figure, this synchronized sampling circuit comprises filter unit circuit 10, voltage comparison unit circuit 20 and pull-up clamp circuit 30, wherein, the input of filter unit circuit connects line voltage, is suitable for carrying out filtering to line voltage; Voltage comparison unit circuit, input is connected in the output of filter unit circuit, is suitable for carrying out Zero-cross comparator to line voltage, and exports comparative result; Pull-up clamp circuit is connected in the output of amplifying unit.
Can process line voltage by foregoing circuit structure well and export corresponding synchronizing signal, to meet the control overflow in Distribution Static Compensator (DSTATCOM), improve the reliability of line voltage.
In concrete enforcement, refer to Fig. 2, give a concrete implementing circuit schematic diagram of synchronized sampling circuit, as shown in the figure, filter unit electricity routing resistance R1, electric capacity C1 are formed, wherein one end of resistance R1 counts line voltage, and the other end of resistance R1 connects the positive pole of electric capacity C1, the minus earth of electric capacity C1; Voltage comparison unit circuit is made up of comparer U1 and resistance R2, the normal phase input end of comparer U1 connects the positive pole of electric capacity C1 in filter unit circuit, the inverting input of comparer U1 is by resistance R2 ground connection, the output terminal of comparer U1 connects pull-up clamp circuit, pull-up clamp circuit is made up of resistance R3 and electric capacity C2, one end of the positive pole contact resistance R3 of electric capacity C2, the other end of resistance R3 connects pull-up voltage (+5V) on, the minus earth of electric capacity C2.In addition, can also connect two phase inverter G1 and phase inverter G2 after pull-up clamp circuit again, to strengthen driving force.
In concrete enforcement, the time constant of filter unit circuit preferably can be set to the output frequency much smaller than system, thus error can be made to ignore.Only as an example, the preferred resistance value of resistance R1 can be set to 1k, and the capacitance of electric capacity C1 can be preferably 15pF.
In addition, resistance R2 can be preferably 10k, and resistance R3 is preferably 10k, and the capacitance of electric capacity C2 can be preferably 15pF.
In concrete enforcement, comparer U1 can be preferably the integrated chip of comparer LM311 to realize Zero-cross comparator, LM311 is the voltage comparator of a high flexibility, the single power supply of 5V-30V or positive and negative 15 separate power supplies can be worked in, as used in common operational amplifier, make LM311 become a kind of really general comparer, the input of this equipment can with systematically isolate.In addition in concrete enforcement, upper pull-up voltage can be the voltage of+5V.
In sum, the utility model can realize the process to line voltage, and provides a reliable line voltage synchronizing signal.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 (9)
1. a synchronized sampling circuit, it is characterized in that: comprise resistance R1, electric capacity C1, comparer U1, resistance R2, resistance R3 and electric capacity C2, wherein, one end of resistance R1 counts line voltage, the other end of resistance R1 connects the positive pole of electric capacity C1, the minus earth of electric capacity C1, the normal phase input end of comparer U1 connects the positive pole of electric capacity C1 in filter unit circuit, the inverting input of comparer U1 is by resistance R2 ground connection, the output terminal of comparer U1 connects the positive pole of electric capacity C2, one end of the positive pole contact resistance R3 of electric capacity C2, the other end of resistance R3 connects pull-up voltage on, the minus earth of electric capacity C2.
2. synchronized sampling circuit according to claim 1, is characterized in that: also comprise phase inverter G1 and phase inverter G2, and phase inverter G1 and phase inverter G2 is connected in series successively on the positive pole of electric capacity C2.
3. synchronized sampling circuit according to claim 1, is characterized in that: the resistance value of resistance R1 is 1k.
4. synchronized sampling circuit according to claim 3, is characterized in that: the capacitance of electric capacity C1 is 15pF.
5. synchronized sampling circuit according to claim 1, is characterized in that: comparer U1 is the integrated chip of comparer LM311.
6. synchronized sampling circuit according to claim 5, is characterized in that: the resistance value of resistance R2 is 10k.
7. synchronized sampling circuit according to claim 1, is characterized in that: the resistance value of resistance R3 is 110k.
8. synchronized sampling circuit according to claim 7, is characterized in that: the capacitance of electric capacity C2 is 15pF.
9. synchronized sampling circuit according to claim 7, is characterized in that: upper pull-up voltage can be the voltage of+5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521004318.3U CN205176117U (en) | 2015-12-04 | 2015-12-04 | Synchronous sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521004318.3U CN205176117U (en) | 2015-12-04 | 2015-12-04 | Synchronous sampling circuit |
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| CN205176117U true CN205176117U (en) | 2016-04-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548653A (en) * | 2015-12-04 | 2016-05-04 | 重庆臻远电气有限公司 | Synchronization sampling circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548653A (en) * | 2015-12-04 | 2016-05-04 | 重庆臻远电气有限公司 | Synchronization sampling circuit |
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