CN102749504A - Sampling circuit of synchronizing signals of grid voltage - Google Patents
Sampling circuit of synchronizing signals of grid voltage Download PDFInfo
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- CN102749504A CN102749504A CN2012102381028A CN201210238102A CN102749504A CN 102749504 A CN102749504 A CN 102749504A CN 2012102381028 A CN2012102381028 A CN 2012102381028A CN 201210238102 A CN201210238102 A CN 201210238102A CN 102749504 A CN102749504 A CN 102749504A
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Abstract
The invention discloses a sample circuit of synchronizing signals of grid voltage. The sampling circuit comprises a power supply, a slide-wire rheostat, a first voltage comparator, a first resistor, a second resistor, a second voltage comparator, a third resistor, a fourth resistor, a fifth resistor and a triode, wherein a sliding end of the slide-wire rheostat is connected with a non-inverting input end of the first voltage comparator; an inverting input end of the first voltage comparator is connected to an output end of the first voltage comparator; an inverting input end of the second voltage comparator is connected with the output end of the first voltage comparator through the first resistor, and the non-inverting input end of the second voltage comparator is grounded through the second resistor, and an output end of the second voltage comparator is connected with the non-inverting input end of the second voltage comparator through the third resistor; and the base electrode of the triode is connected with the output end of the second voltage comparator through the fourth resistor, the emitter electrode of the triode is connected with the power supply, and the collector electrode of the triode is grounded through the fifth resistor. The sample circuit of the synchronizing signals of the grid voltage, provided by the invention, is simple in structure, low in cost and easy to implement, and by using the sample circuit, the precise zero crossing point detection can be achieved.
Description
Technical field
The present invention relates to a kind of voltage sampling circuit, relate in particular to a kind of synchronizing signal sample circuit of line voltage.
Background technology
Along with the widespread use of a series of electronic equipments in electric system such as reactive power compensator, photovoltaic power generation grid-connecting inverter, uncontrollable rectifiers; The problem of line voltage three-phase imbalance and wave form distortion is on the rise; Solve the problem of line voltage three-phase imbalance and wave form distortion; Make each power electronic equipment move with security and stability, just need realize the synchronizing signal of line voltage detecting quickly and accurately.At present, generally be to utilize voltage sensor that line voltage is sampled earlier to the sampling of the synchronizing signal of line voltage, passed through zero balancing then, thus the synchronizing signal of obtaining.But present line voltage synchronizing signal sample circuit or zero crossing accuracy of detection are low, and the precision of the synchronizing signal of influence output can not satisfy the requirement of application, or with the structure of complicacy and the very high original accurate zero crossing detection that realizes that becomes, impracticable.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, with low cost, be easy to realize and can realize the line voltage synchronizing signal sample circuit that accurate zero crossing detects.
The technical scheme that realizes above-mentioned purpose is:
A kind of synchronizing signal sample circuit of line voltage; It receives the mains voltage signal of being gathered by voltage sensor; Said sample circuit comprises power supply, rheochord, first voltage comparator, first resistance, second resistance, second voltage comparator, the 3rd resistance, the 4th resistance, the 5th resistance and triode, wherein:
One stiff end of said rheochord receives said mains voltage signal, another stiff end ground connection, and sliding end connects the in-phase input end of said first voltage comparator;
The inverting input of said first voltage comparator connects the output terminal of this first voltage comparator;
The inverting input of said second voltage comparator connects the output terminal of said first voltage comparator through said first resistance; The in-phase input end of this second voltage comparator is through said second resistance eutral grounding, and the output terminal of this second voltage comparator connects the in-phase input end of this second voltage comparator through said the 3rd resistance;
The base stage of said triode connects the output terminal of said second voltage comparator through said the 4th resistance, and emitter connects said power supply, and collector is through said the 5th resistance eutral grounding;
End output and the said mains voltage signal synchronizing signal of mutually synchronization mutually of joining of the collector of said triode and said the 5th resistance.
The invention has the beneficial effects as follows: the present invention selects electron devices such as simple resistance, voltage comparator for use, and is simple in structure, with low cost and be easy to realize.Simultaneously, the present invention has realized that accurate zero crossing detects, thereby has guaranteed the accuracy of line voltage synchronizing signal.
Description of drawings
Fig. 1 is the circuit diagram of the synchronizing signal sample circuit of line voltage of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1, the synchronizing signal sample circuit of line voltage of the present invention, it receives the mains voltage signal V that is gathered by the voltage sensor (not shown)
In, said sample circuit comprises power supply V, rheochord R, the first voltage comparator U1, first resistance R 1, second resistance R 2, the second voltage comparator U2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5 and triode D, wherein:
The stiff end of rheochord R receives mains voltage signal V
In, another stiff end ground connection, sliding end connects the in-phase input end of the first voltage comparator U1;
The inverting input of the first voltage comparator U1 connects the output terminal of this first voltage comparator U1;
The inverting input of the second voltage comparator U2 connects the output terminal of the first voltage comparator U1 through first resistance R 1; The in-phase input end of the second voltage comparator U2 is through second resistance R, 2 ground connection, and the output terminal of the second voltage comparator U2 connects the in-phase input end of this second voltage comparator U2 through the 3rd resistance R 3;
The base stage of triode D is through the output terminal of the 4th resistance R 4 connections second voltage comparator U2, and emitter connects power supply V, and collector is through the 5th resistance R 5 ground connection;
End output and the said mains voltage signal synchronizing signal V of mutually synchronization mutually that joins of the collector of triode D and the 5th resistance R 5
Out
In the present embodiment, the first voltage comparator U1 and the second voltage comparator U2 supply power by power supply V.
Rheochord R, the first voltage comparator U1 and first resistance R 1 are formed the buffering link, play inhibition, absorb and cushion the effect of protecting; Mains voltage signal V
InAfter this buffering link, realized zero balancing via the second voltage comparator U2, the output high level is given triode D, by collector and the joining of the 5th resistance R 5 of triode D holding the synchronizing signal V of output line voltage
Out
Above embodiment only supplies to explain the present invention's usefulness; But not limitation of the present invention; The technician in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited each claim.
Claims (1)
1. the synchronizing signal sample circuit of a line voltage; It receives the mains voltage signal of being gathered by voltage sensor; It is characterized in that; Said sample circuit comprises power supply, rheochord, first voltage comparator, first resistance, second resistance, second voltage comparator, the 3rd resistance, the 4th resistance, the 5th resistance and triode, wherein:
One stiff end of said rheochord receives said mains voltage signal, another stiff end ground connection, and sliding end connects the in-phase input end of said first voltage comparator;
The inverting input of said first voltage comparator connects the output terminal of this first voltage comparator;
The inverting input of said second voltage comparator connects the output terminal of said first voltage comparator through said first resistance; The in-phase input end of this second voltage comparator is through said second resistance eutral grounding, and the output terminal of this second voltage comparator connects the in-phase input end of this second voltage comparator through said the 3rd resistance;
The base stage of said triode connects the output terminal of said second voltage comparator through said the 4th resistance, and emitter connects said power supply, and collector is through said the 5th resistance eutral grounding;
End output and the said mains voltage signal synchronizing signal of mutually synchronization mutually of joining of the collector of said triode and said the 5th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102381028A CN102749504A (en) | 2012-07-10 | 2012-07-10 | Sampling circuit of synchronizing signals of grid voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102381028A CN102749504A (en) | 2012-07-10 | 2012-07-10 | Sampling circuit of synchronizing signals of grid voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102749504A true CN102749504A (en) | 2012-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102381028A Pending CN102749504A (en) | 2012-07-10 | 2012-07-10 | Sampling circuit of synchronizing signals of grid voltage |
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| CN (1) | CN102749504A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510691A (en) * | 2015-12-04 | 2016-04-20 | 重庆臻远电气有限公司 | Network voltage synchronous circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201156057Y (en) * | 2007-12-14 | 2008-11-26 | 青岛海信电器股份有限公司 | Zero-crossing detection circuit |
| CN201780329U (en) * | 2010-05-31 | 2011-03-30 | 比亚迪股份有限公司 | Grid voltage signal sampling system |
| CN201926916U (en) * | 2011-01-20 | 2011-08-10 | 安徽省紫光照明科技有限公司 | Motor monitoring device |
-
2012
- 2012-07-10 CN CN2012102381028A patent/CN102749504A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201156057Y (en) * | 2007-12-14 | 2008-11-26 | 青岛海信电器股份有限公司 | Zero-crossing detection circuit |
| CN201780329U (en) * | 2010-05-31 | 2011-03-30 | 比亚迪股份有限公司 | Grid voltage signal sampling system |
| CN201926916U (en) * | 2011-01-20 | 2011-08-10 | 安徽省紫光照明科技有限公司 | Motor monitoring device |
Non-Patent Citations (1)
| Title |
|---|
| 无: "电流镜及同步采样电路图", 《HTTP://WENKU.BAIDU.COM/LINK?URL=8SGPTSL7Z9WYKHJTPLAC8UFRG-ZEOHIV1LWMDO6W-3UURA-SNJTTOTBJ1DFASXEZWPS_D_WY961TETBIUIMW3ABDYXRNTHOUFALYY8IUR2W》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510691A (en) * | 2015-12-04 | 2016-04-20 | 重庆臻远电气有限公司 | Network voltage synchronous circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20121015 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20121015 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant after: Shanghai Electric Power Corporation Applicant after: State Grid Corporation of China Address before: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant before: Shanghai Electric Power Corporation |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121024 |