CN201724974U - Small-capacity harmonic full-current detection circuit - Google Patents
Small-capacity harmonic full-current detection circuit Download PDFInfo
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- CN201724974U CN201724974U CN2010202074774U CN201020207477U CN201724974U CN 201724974 U CN201724974 U CN 201724974U CN 2010202074774 U CN2010202074774 U CN 2010202074774U CN 201020207477 U CN201020207477 U CN 201020207477U CN 201724974 U CN201724974 U CN 201724974U
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Abstract
The utility model relates to a small-capacity harmonic full-current detection circuit, which is characterized by comprising an external voltage input alternating current end, a small capacitor, a current transformer, a calculation amplifying circuit, a rectification circuit, a first comparison circuit, a second comparison circuit, a status alarm circuit and an overvoltage detection circuit, wherein one end of the external voltage input alternating current end is connected with one end of the small capacitor; the other end of the small capacitor is connected with the input end of the current transformer; the output end of the current transformer is connected with the first comparison circuit and the second comparison circuit through the calculation amplifying circuit and the rectification circuit; the output ends of the first comparison circuit and the second comparison circuit are connected with the status alarm circuit; and the external voltage input alternating current end is connected with the status alarm circuit through the overvoltage detection circuit. The circuit can effectively detect the harmonic in a power network, can give a corresponding alarm according to the size of the harmonic and achieves the effects of simple harmonic and rapid detection.
Description
Technical field
The utility model relates to a kind of little electric capacity harmonic wave total current testing circuit.
Background technology
Along with the use of a large amount of nonlinear loads at electric power network, harmonic wave has become undisputable fact at the power supply net than ubiquity, and harmonic wave is the more serious problem of supply and distribution network to the infringement of building-out capacitor cabinet.Therefore, be current problem to be processed to the detection and the control of harmonic wave, existing harmonics detection circuit complexity, and can not carry out corresponding warning according to the size of harmonic content.
Summary of the invention
In view of the above problems, the purpose of this utility model provides a kind of little electric capacity harmonic wave total current testing circuit, can realize the harmonic wave in the power network is detected simply, efficiently.
The utility model is realized by the following technical solutions: a kind of little electric capacity harmonic wave total current testing circuit is characterized in that: the interchange end, little electric capacity, current transformer, operational amplification circuit, rectification circuit, first comparator circuit, second comparator circuit, state warning circuit and the over-voltage detection circuit that comprise the external voltage input; One end of described external voltage input is connected with an end of little electric capacity, the other end of little electric capacity is connected with the input end of current transformer, and the output terminal of described current transformer is connected with second comparator circuit with first comparator circuit through operational amplification circuit, rectification circuit; The output terminal of described first comparator circuit and second comparator circuit is connected with the state warning circuit, and the interchange end of described external voltage input is connected with described state warning circuit through an overvoltage detection circuit.
The utility model is by little electric capacity, and current transformer is coupled out the harmonic current of power network, judges size of current by comparing amplifying circuit, thereby makes corresponding warning, and circuit is simple, and is reasonable in design, has marketable value preferably.
Description of drawings
Fig. 1 is the utility model schematic block circuit diagram.
Fig. 2 is the schematic block circuit diagram of the utility model one examples of implementation.
Fig. 3 is originally to be the physical circuit connection diagram of utility model one examples of implementation.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further.
As shown in Figure 1, the utility model provides a kind of little electric capacity harmonic wave total current testing circuit, it is characterized in that: the interchange end, little electric capacity, current transformer, operational amplification circuit, rectification circuit, first comparator circuit, second comparator circuit, state warning circuit and the over-voltage detection circuit that comprise the external voltage input; One end of described external voltage input is connected with an end of little capacitor C 1, the other end of little electric capacity is connected with the input end of current transformer T1, and the output terminal of described current transformer is connected with second comparator circuit with first comparator circuit through operational amplification circuit, rectification circuit; The output terminal of described first comparator circuit and second comparator circuit is connected with the state warning circuit, and the interchange end of described external voltage input is connected with described state warning circuit through an overvoltage detection circuit.
In the utility model one preferred embodiment, as shown in Figure 2, described over-voltage detection circuit comprises that an interchange terminal voltage with the external voltage input transfers the current signal that flows through resistance to; The second current transformer T2 that is connected with this resistance; And the rectification circuit and the 3rd comparator circuit that are connected in this second current transformer successively, described the 3rd comparator circuit is connected with the state warning circuit.This over-voltage detection circuit can effectively be judged, the harmonic wave mistake caution whether overvoltage causes.
Concrete, see also Fig. 3, Fig. 3 is the concrete testing circuit of the utility model one, the utility model is obtained the harmonic components of electrical network bus by little electric capacity, current transformer, after amplification, rectification, give two comparator circuits respectively and compare judgement, here be noted that, described two comparator circuits can be set comparative voltage, here as required, we can be provided with when harmonic content is 10%, first comparator circuit output alarm signal, when harmonic content is 5%, second comparator circuit output alarm signal.
The above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (2)
1. one kind little electric capacity harmonic wave total current testing circuit is characterized in that: the interchange end, little electric capacity, current transformer, operational amplification circuit, rectification circuit, first comparator circuit, second comparator circuit, state warning circuit and the over-voltage detection circuit that comprise the external voltage input; One end of described external voltage input is connected with an end of little electric capacity, the other end of little electric capacity is connected with the input end of current transformer, and the output terminal of described current transformer is connected with second comparator circuit with first comparator circuit through operational amplification circuit, rectification circuit; The output terminal of described first comparator circuit and second comparator circuit is connected with the state warning circuit, and the interchange end of described external voltage input is connected with described state warning circuit through an overvoltage detection circuit.
2. little electric capacity harmonic wave total current testing circuit according to claim 1, it is characterized in that: described overvoltage detection circuit comprises:
Transfer the interchange terminal voltage of external voltage input to flow through resistance current signal;
Second current transformer that is connected with this resistance; And the rectification circuit and the 3rd comparator circuit that are connected in this second current transformer successively, described the 3rd comparator circuit is connected with the state warning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202074774U CN201724974U (en) | 2010-05-28 | 2010-05-28 | Small-capacity harmonic full-current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202074774U CN201724974U (en) | 2010-05-28 | 2010-05-28 | Small-capacity harmonic full-current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201724974U true CN201724974U (en) | 2011-01-26 |
Family
ID=43493314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202074774U Expired - Fee Related CN201724974U (en) | 2010-05-28 | 2010-05-28 | Small-capacity harmonic full-current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201724974U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628889A (en) * | 2012-04-17 | 2012-08-08 | 东莞市精诚电能设备有限公司 | Voltage sampling circuit |
| CN111257673A (en) * | 2020-02-17 | 2020-06-09 | 广东博智林机器人有限公司 | Capacitor fault detection circuit, detection method and servo drive circuit |
-
2010
- 2010-05-28 CN CN2010202074774U patent/CN201724974U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628889A (en) * | 2012-04-17 | 2012-08-08 | 东莞市精诚电能设备有限公司 | Voltage sampling circuit |
| CN102628889B (en) * | 2012-04-17 | 2014-07-23 | 东莞市精诚电能设备有限公司 | Voltage sampling circuit |
| CN111257673A (en) * | 2020-02-17 | 2020-06-09 | 广东博智林机器人有限公司 | Capacitor fault detection circuit, detection method and servo drive circuit |
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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: 20110126 Termination date: 20130528 |