CN102944725A - Full-current frequency conversion device for leakage current - Google Patents
Full-current frequency conversion device for leakage current Download PDFInfo
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- CN102944725A CN102944725A CN2012105205244A CN201210520524A CN102944725A CN 102944725 A CN102944725 A CN 102944725A CN 2012105205244 A CN2012105205244 A CN 2012105205244A CN 201210520524 A CN201210520524 A CN 201210520524A CN 102944725 A CN102944725 A CN 102944725A
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- current
- leakage
- frequency conversion
- oscillator
- varactor
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Abstract
The invention relates to a full-current frequency conversion device for leakage current, which is used for more accurately detecting the leakage full current conveniently. The frequency conversion device comprises an operational amplifier module, a variable capacitance diode and an oscillator, which are sequentially connected with one another by a circuit. The leakage full current input into the frequency conversion device is amplified by the operational amplifier module; and the amplified leakage full current is input into the variable capacitance diode, and the variable capacitance parameter of the oscillator is provided by the operational amplifier module, so that the output frequency of the oscillator meets the following formula: OUT= kCB =knVIN, wherein CB is the capacitance value of the variable capacitance diode, VIN is the input voltage of the device, and k and n are the inherent amplification coefficients of the oscillator and the variable capacitance diode.
Description
Technical field
The present invention relates to a kind of frequency conversion apparatus that leakage current is leaked the total current collection.
Background technology
The leakage total current (hereinafter to be referred as total current) of leakage current has comprised capacitive leakage current (hereinafter to be referred as capacity current) and two parts of resistive leakage current (hereinafter to be referred as current in resistance property).Wherein current in resistance property is the technical parameter that really reflects the leakage current running status.
Total current and voltage because the detection of current in resistance property conventionally must be sampled by calculating voltage and circuital angle, then utilize the trigonometric function relation to extrapolate current in resistance property.
Current in resistance property generally only accounts for circuital 10%---and 15%, the current in resistance property value error that calculates through twice multiplication is larger.Cause two critical defects of conventional sense method:
1, accuracy of detection relatively poor, can't truly reflect the leakage current duty.
2, testing cost is higher, owing to need to use the high pressure P T of sampled voltage, can't promote.
Summary of the invention
The purpose of this invention is to provide a kind of leakage current total current frequency conversion apparatus, so that carry out more accurate detection to leaking total current.
In order to achieve the above object, technical scheme of the present invention provides a kind of leakage current total current frequency conversion apparatus, and it comprises the successively amplifier module of circuit connection, varactor, and oscillator;
Wherein, input the leakage total current of described frequency conversion apparatus, amplify by described amplifier module; Leakage total current after the amplification inputs to described varactor, and the variable capacitance parameter of described oscillator is provided by this varactor; So that from the frequency f of described oscillator output
OUT=kC
B=k nV
IN, C wherein
BBe the capacitance of described varactor, V
INBe the input voltage of device, k, n are the absolute amplification of described oscillator and described varactor.
In the preferred embodiment, amplification coefficient k=0.5, n=10, the then frequency f of described oscillator output
OUT=0.5C
B, C
B=10V
IN, f
OUT=5V
IN
Description of drawings
Fig. 1 is the synoptic diagram of leakage current total current frequency conversion apparatus of the present invention.
Embodiment
As shown in Figure 1, leakage current total current frequency conversion apparatus of the present invention is provided with the successively amplifier modules A of circuit connection, varactor B, and oscillator C.
In the preferred embodiment, the model of amplifier modules A is TL062; The model of varactor B is 1NS6CB; The model of oscillator C is VFC32.
Concrete, leak total current from the described amplifier modules A of IN end input of this device, amplify leaking total current by the amplifier modules A.Leakage total current after the amplification is inputted described varactor B, provides the variable capacitance parameter of described oscillator C by varactor B.
The output OUT of described oscillator C is frequency f
OUT=kC
B, C wherein
BCapacitance for varactor B.C
B=nV
IN, f
OUT=k nV
IN, k, n are the absolute amplification of corresponding device.In the preferred example, k=0.5, n=10, the then frequency f of this device output
OUT=0.5C
B, C
B=10V
IN, f
OUT=5V
IN
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (2)
1. a leakage current total current frequency conversion apparatus is characterized in that, comprises the successively amplifier module of circuit connection, varactor, and oscillator;
Wherein, input the leakage total current of described frequency conversion apparatus, amplify by described amplifier module; Leakage total current after the amplification inputs to described varactor, and the variable capacitance parameter of described oscillator is provided by this varactor; So that from the frequency f of described oscillator output
OUT=kC
B=k nV
IN, C wherein
BBe the capacitance of described varactor, V
INBe the input voltage of device, k, n are the absolute amplification of described oscillator and described varactor.
2. leakage current total current frequency conversion apparatus as claimed in claim 1 is characterized in that:
Amplification coefficient k=0.5, n=10, the then frequency f of described oscillator output
OUT=0.5C
B, C
B=10V
IN, f
OUT=5V
IN
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105205244A CN102944725A (en) | 2012-12-07 | 2012-12-07 | Full-current frequency conversion device for leakage current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105205244A CN102944725A (en) | 2012-12-07 | 2012-12-07 | Full-current frequency conversion device for leakage current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102944725A true CN102944725A (en) | 2013-02-27 |
Family
ID=47727685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105205244A Pending CN102944725A (en) | 2012-12-07 | 2012-12-07 | Full-current frequency conversion device for leakage current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102944725A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004333208A (en) * | 2003-03-11 | 2004-11-25 | Fuji Electric Systems Co Ltd | Ultra-small current / frequency converter |
| CN101762766A (en) * | 2008-12-25 | 2010-06-30 | 上海电气自动化设计研究所有限公司 | Arrester full current frequency conversion circuit and method thereof |
| CN202975118U (en) * | 2012-12-07 | 2013-06-05 | 上海市电力公司 | Full-current frequency conversion apparatus for leakage current |
-
2012
- 2012-12-07 CN CN2012105205244A patent/CN102944725A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004333208A (en) * | 2003-03-11 | 2004-11-25 | Fuji Electric Systems Co Ltd | Ultra-small current / frequency converter |
| CN101762766A (en) * | 2008-12-25 | 2010-06-30 | 上海电气自动化设计研究所有限公司 | Arrester full current frequency conversion circuit and method thereof |
| CN202975118U (en) * | 2012-12-07 | 2013-06-05 | 上海市电力公司 | Full-current frequency conversion apparatus for leakage current |
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| C06 | Publication | ||
| PB01 | Publication | ||
| 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: 20130227 |