CN202975109U - Leakage-current constant-amplitude amplification apparatus - Google Patents
Leakage-current constant-amplitude amplification apparatus Download PDFInfo
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- CN202975109U CN202975109U CN 201220668109 CN201220668109U CN202975109U CN 202975109 U CN202975109 U CN 202975109U CN 201220668109 CN201220668109 CN 201220668109 CN 201220668109 U CN201220668109 U CN 201220668109U CN 202975109 U CN202975109 U CN 202975109U
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- operational amplifier
- leakage current
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- output
- input terminal
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- 230000003321 amplification Effects 0.000 title abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 title abstract description 7
- 230000005669 field effect Effects 0.000 claims description 17
- 238000001514 detection method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
A leakage-current constant-amplitude amplification apparatus includes an input terminal, an operational amplifier, an FET and an output terminal, wherein the input terminal is connected with a non-inverting input terminal of the operational amplifier. The leakage current is transmitted to the operational amplifier to be amplified through the input terminal. The output terminal is connected with an output terminal of the operational amplifier. The outputted leakage current amplified by the operational amplifier is outputted to the constant-amplitude amplification apparatus by the output terminal. The FET is connected between the output terminal and an inverting input terminal of the operational amplifier. The outputted leakage current amplified by the operational amplifier is fed back to the inverting input terminal of the operational amplifier. By adopting a simple circuit structure, constant-amplitude amplification of the leakage current can be obtained, precision is high, cost is low and the apparatus can reflect work states of lightning arresters really and effectively.
Description
Technical field
The utility model relates to a kind of leakage current measurement technology, is specifically related to a kind of device that leakage current is carried out the constant amplitude amplification.
Background technology
The leakage current of lightning arrester (claiming again to leak total 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.
Due to the conventionally necessary sampled leakage total current of the detection of current in resistance property and voltage, by calculating voltage and the circuital angle of leakage, then utilize the trigonometric function relation to extrapolate current in resistance property.
It is circuital 10%～15% that current in resistance property generally only accounts for, and the current in resistance property value error that calculates through twice multiplication is larger.Therefore cause this conventional sense method to have two critical defects: 1, relatively poor, the duty that can't truly reflect lightning arrester of accuracy of detection; 2, testing cost is higher, uses the high pressure P T of sampled voltage due to needs, can't promote.
The utility model content
The utility model provides a kind of leakage current constant amplitude multiplying arrangement, and circuit structure is simple, and precision is high, and cost is low, and the duty of reaction lightning arrester that can be authentic and valid.
For achieving the above object, the utility model provides a kind of leakage current constant amplitude multiplying arrangement, and it comprises: input terminal, operational amplifier, field effect transistor and lead-out terminal;
Described input terminal is connected with the normal phase input end of operational amplifier, and leakage current transfers in operational amplifier by this input terminal and amplifies;
Described lead-out terminal is connected with the output terminal of operational amplifier, and after amplifying through operational amplifier, the leakage current of output is via lead-out terminal output constant amplitude multiplying arrangement;
Described field effect transistor is connected between the output terminal and inverting input of operational amplifier, and after amplifying through operational amplifier, the leakage current of output feeds back to the inverting input of operational amplifier.
The grid of described field effect transistor all is connected with the output terminal of operational amplifier with drain electrode, and the source electrode of this field effect transistor is connected with the inverting input of operational amplifier.
In sum, leakage current constant amplitude multiplying arrangement provided by the utility model, by simple circuit structure, can obtain leakage current etc. amplitude amplify, precision is high, cost is low, and the duty that reflects lightning arrester that can be authentic and valid.
Description of drawings
The circuit diagram of the leakage current constant amplitude multiplying arrangement that Fig. 1 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing, further illustrate specific embodiment of the utility model.
As shown in Figure 1, the utility model discloses a kind of leakage current constant amplitude multiplying arrangement, and it comprises: input terminal 1, operational amplifier 2, field effect transistor 3 and lead-out terminal 4.
Wherein, described input terminal 1 is connected with the normal phase input end of operational amplifier 2, and leakage current transfers in operational amplifier 2 by this input terminal 1 and amplifies, and the input voltage of this operational amplifier 2 is V
IN
Described lead-out terminal 4 is connected with the output terminal of operational amplifier 2, and after amplifying through operational amplifier 2, the leakage current of output is via lead-out terminal 4 output constant amplitude multiplying arrangements, and the output voltage of this operational amplifier 2 is V
OUT
Described field effect transistor 3 is connected between the output terminal and inverting input of operational amplifier 2, and after amplifying through operational amplifier 2, the leakage current of output feeds back to the inverting input of operational amplifier 2.
The grid G of described field effect transistor 3 all is connected with the output terminal of operational amplifier 2 with drain D, and the source S of this field effect transistor 3 is connected with the inverting input of operational amplifier 2, therefore, acts on the gate source voltage V of field effect transistor 3
GSIt is the output voltage V of operational amplifier 2
OUTWith input voltage V
INPoor, i.e. V
GS=V
OUT-V
INAnd the impedance R of field effect transistor 3
BBy V
GSDetermine, i.e. R
B=KV
GS, wherein K is the intrinsic coefficient of field effect transistor 3.And R
BBe again the feedback resistance of operational amplifier 2, it has determined the gain amplifier G=fR of operational amplifier 2
B, wherein f is the intrinsic coefficient of operational amplifier 2.In sum, can obtain G=fR
B=fKV
GS=fK (V
OUT-V
IN), that is to say, determined the gain amplifier of operational amplifier 2 through the output of the leakage current of this operational amplifier 2 and the difference of input, thereby the output of the leakage current that amplitude is amplified such as guaranteed.
In the present embodiment, the model that described field effect transistor 3 adopts is 3DJ8, and the value of its intrinsic COEFFICIENT K is 0.05.The model that described operational amplifier 2 adopts is TL062, and the value of its intrinsic coefficient f is 40.Leakage current transfers to the normal phase input end of operational amplifier 2 from input terminal 1, after 2 pairs of leakage currents of operational amplifier amplify, via lead-out terminal 4 output constant amplitude multiplying arrangements.And the leakage current after amplification feeds back to the inverting input of operational amplifier 2 via field effect transistor 3.According to G=fR
B=fKV
GS=fK (V
OUT-V
IN), can calculate G=2 (V
OUT-V
IN).Therefore, the gain amplifier of operational amplifier 2 is the difference that the output of the leakage current of 2 times is inputted, thereby can guarantee amplification and output with amplitudes such as leakage currents.
In sum, leakage current constant amplitude multiplying arrangement provided by the utility model, by simple circuit structure, can obtain leakage current etc. amplitude amplify, precision is high, cost is low, and the duty that reflects lightning arrester that can be authentic and valid.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute will be all apparent.Therefore, protection domain of the present utility model should be limited to the appended claims.
Claims (2)
1. a leakage current constant amplitude multiplying arrangement, is characterized in that, comprises: input terminal (1), operational amplifier (2), field effect transistor (3) and lead-out terminal (4);
Described input terminal (1) is connected with the normal phase input end of operational amplifier (2), and leakage current transfers in operational amplifier (2) by this input terminal (1) and amplifies;
Described lead-out terminal (4) is connected with the output terminal of operational amplifier (2), and after amplifying through operational amplifier (2), the leakage current of output is via lead-out terminal (4) output constant amplitude multiplying arrangement;
Described field effect transistor (3) is connected between the output terminal and inverting input of operational amplifier (2), and after amplifying through operational amplifier (2), the leakage current of output feeds back to the inverting input of operational amplifier (2).
2. leakage current constant amplitude multiplying arrangement as claimed in claim 1, it is characterized in that, the grid of described field effect transistor (3) all is connected with the output terminal of operational amplifier (2) with drain electrode, and the source electrode of this field effect transistor (3) is connected with the inverting input of operational amplifier (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220668109 CN202975109U (en) | 2012-12-07 | 2012-12-07 | Leakage-current constant-amplitude amplification apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220668109 CN202975109U (en) | 2012-12-07 | 2012-12-07 | Leakage-current constant-amplitude amplification apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202975109U true CN202975109U (en) | 2013-06-05 |
Family
ID=48516167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220668109 Expired - Lifetime CN202975109U (en) | 2012-12-07 | 2012-12-07 | Leakage-current constant-amplitude amplification apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202975109U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562841A (en) * | 2018-06-14 | 2018-09-21 | 山东阅芯电子科技有限公司 | leakage current detection method and device in electronic component environmental aging test |
-
2012
- 2012-12-07 CN CN 201220668109 patent/CN202975109U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562841A (en) * | 2018-06-14 | 2018-09-21 | 山东阅芯电子科技有限公司 | leakage current detection method and device in electronic component environmental aging test |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130605 |
|
| CX01 | Expiry of patent term |