CN101762765A - Arrester full current continuous amplifying circuit and method thereof - Google Patents
Arrester full current continuous amplifying circuit and method thereof Download PDFInfo
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- CN101762765A CN101762765A CN200810207718A CN200810207718A CN101762765A CN 101762765 A CN101762765 A CN 101762765A CN 200810207718 A CN200810207718 A CN 200810207718A CN 200810207718 A CN200810207718 A CN 200810207718A CN 101762765 A CN101762765 A CN 101762765A
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- amplifier
- effect transistor
- field effect
- current
- total current
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Abstract
The invention discloses an arrester full current continuous amplifying circuit and a method thereof. The method can promote the detecting precision, is capable of really reflecting the working state of the arrester, has low detecting cost, and is easy to popularize. The technical scheme of the invention is that the arrester full current continuous amplifying circuit comprises an operational amplifier and a field-effect tube, wherein a current input end is connected with a normal phase input end of the operational amplifier; an output end of the operational amplifier is connected with a current output end and the field-effect tube; and the source electrode of the field-effect tube is connected with an inverted phase input end of the operational amplifier.
Description
Technical field
The present invention relates to a kind of total current constant amplitude amplifying circuit and method, relate in particular to a kind of lightning arrester total current constant amplitude amplifying circuit and method.
Technical background
The leakage total current of lightning arrester has comprised capacitive leakage current and two parts of resistive leakage current.Wherein resistive leakage current is the technical parameter that really reflects the lightning arrester running status.Because conventionally necessary sampled leakage total current of the detection of resistive leakage current and voltage by calculating voltage and circuital angle, utilize the trigonometric function relation to extrapolate current in resistance property then.Thereby current in resistance property generally only accounts for circuitally 10% to 15%, and the current in resistance property value error that calculates through twice multiplication is bigger.Cause two critical defects of conventional sense method, that is: accuracy of detection relatively poor, can't truly reflect the lightning arrester duty and detect cost higher owing to need to use the high pressure P T of sampled voltage, can't promote.
Summary of the invention
The present invention has overcome deficiency of the prior art, and a kind of accuracy of detection height is provided, and lower-cost lightning arrester total current constant amplitude amplifying circuit and method thereof, reflects the lightning arrester duty more realistically, is easy to promote.
The present invention is achieved by following technical proposals:
A kind of lightning arrester total current constant amplitude amplifying circuit of one of the present invention comprises amplifier (4) and field effect transistor (3); Current input terminal (1) connects the normal phase input end of amplifier, and the output terminal of amplifier connects current output terminal (2) and field effect transistor (3), and the source electrode of field effect transistor (3) connects the inverting input of amplifier (4).
A kind of lightning arrester total current constant amplitude amplification method of two of the present invention may further comprise the steps:
Step 1: will leak total current and input to the normal phase input end of amplifier (4), and amplify to leaking total current by current input terminal (1);
Step 2: the leakage total current after will amplifying is exported by current output terminal (2) from the output terminal of amplifier (4), and feeds back to the inverting input of amplifier (4) through field effect transistor (3);
Step 3: the grid of field effect transistor (3) is all linked to each other with current output terminal (2) with drain electrode, and the source electrode with field effect transistor (3) links to each other with amplifier (4) inverting input simultaneously;
Step 4: by formula V
GS=V
OUT-V
INDetermine to act on the gate-source voltage V of field effect transistor (3)
GS, V
OUTBe output voltage, V
INBe input voltage;
Step 5: by formula R
3=KV
GSDetermine the impedance R of effect pipe (3)
3, K is the intrinsic amplification coefficient of device;
Step 6: by formula G=fR=fKV
GS=fK (V
OUT-V
IN), K, f are the intrinsic amplification coefficient of device, determine the gain amplifier G of amplifier (4), the leakage total current output of amplitude such as guarantee.
Owing to adopt technique scheme, a kind of lightning arrester total current constant amplitude amplifying circuit provided by the invention and method thereof have such beneficial effect: the precision that improve to detect greatly, more truly reflect the lightning arrester duty, it is lower to detect cost simultaneously, is easy to promote.
Description of drawings
Fig. 1 is the structural representation of one of the present invention's lightning arrester total current constant amplitude amplifying circuit.
Embodiment
Below by embodiment the present invention is described in further detail.
A kind of lightning arrester total current constant amplitude amplifying circuit of one of the present invention comprises amplifier (4) and field effect transistor (3); Current input terminal (1) connects the normal phase input end of amplifier, and the output terminal of amplifier connects current output terminal (2) and field effect transistor (3), and the source electrode of field effect transistor (3) connects the inverting input of amplifier (4).
A kind of lightning arrester total current constant amplitude amplification method of two of the present invention may further comprise the steps:
Step 1: will leak total current and input to the normal phase input end of the amplifier that model is TL062 (4), and amplify to leaking total current by current input terminal (1);
Step 2: the leakage total current after will amplifying by current output terminal (2) output, and is the inverting input that the field effect transistor (3) of 3DJ8 feeds back to amplifier (4) through model from the output terminal of amplifier (4);
Step 3: the grid of field effect transistor (3) is all linked to each other with current output terminal (2) with drain electrode, and the source electrode with field effect transistor (3) links to each other with amplifier (4) inverting input simultaneously;
Step 4: by formula V
GS=V
OUT-V
INDetermine to act on the gate-source voltage V of field effect transistor (3)
GS, V
OUTBe output voltage, V
INBe input voltage;
Step 5: by formula R=KV
GSDetermine the impedance R of effect pipe (3)
3, K=0.05, R
3=0.05V
GSK is the intrinsic amplification coefficient of device;
Step 6: by formula G=fR=fKV
GS=fK (V
OUT-V
IN), K, f are the intrinsic amplification coefficient of device, determine the gain amplifier G of amplifier (4), f=40, K=0.05, then G=40R
3=2V
GS=2 (V
OUT-V
IN), the amplifier gain amplifier is the difference of the circuital output of 2 times leakage input, the leakage total current output of amplitude such as guarantees.
Above embodiment has been described in detail the present invention, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details in the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (2)
1. a lightning arrester total current constant amplitude amplifying circuit is characterized in that: comprise amplifier (4) and field effect transistor (3); Current input terminal (1) connects the normal phase input end of amplifier, and the output terminal of amplifier connects current output terminal (2) and field effect transistor (3), and the source electrode of field effect transistor (3) connects the inverting input of amplifier (4).
2. lightning arrester total current constant amplitude amplification method may further comprise the steps:
Step 1: will leak total current and input to the normal phase input end of amplifier (4), and amplify to leaking total current by current input terminal (1);
Step 2: the leakage total current after will amplifying is exported by current output terminal (2) from the output terminal of amplifier (4), and feeds back to the inverting input of amplifier (4) through field effect transistor (3);
Step 3: the grid of field effect transistor (3) is all linked to each other with current output terminal (2) with drain electrode, and the source electrode with field effect transistor (3) links to each other with amplifier (4) inverting input simultaneously;
Step 4: by formula V
GS=V
OUT-V
INDetermine to act on the gate-source voltage V of field effect transistor (3)
GS, V
OUTBe output voltage, V
INBe input voltage;
Step 5: by formula R=KV
GSDetermine the impedance R of effect pipe (3)
3, K is the intrinsic amplification coefficient of device;
Step 6: by formula G=fR=fKV
GS=fK (V
OUT-V
IN), K, f are the intrinsic amplification coefficient of device, determine the gain amplifier G of amplifier (4), the leakage total current output of amplitude such as guarantee.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810207718A CN101762765A (en) | 2008-12-25 | 2008-12-25 | Arrester full current continuous amplifying circuit and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810207718A CN101762765A (en) | 2008-12-25 | 2008-12-25 | Arrester full current continuous amplifying circuit and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101762765A true CN101762765A (en) | 2010-06-30 |
Family
ID=42494054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810207718A Pending CN101762765A (en) | 2008-12-25 | 2008-12-25 | Arrester full current continuous amplifying circuit and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101762765A (en) |
-
2008
- 2008-12-25 CN CN200810207718A patent/CN101762765A/en active Pending
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100630 |