CN201319153Y - Controllable weak current source - Google Patents
Controllable weak current source Download PDFInfo
- Publication number
- CN201319153Y CN201319153Y CNU2008201240411U CN200820124041U CN201319153Y CN 201319153 Y CN201319153 Y CN 201319153Y CN U2008201240411 U CNU2008201240411 U CN U2008201240411U CN 200820124041 U CN200820124041 U CN 200820124041U CN 201319153 Y CN201319153 Y CN 201319153Y
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- cavity
- current source
- weak current
- source
- controllable
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Abstract
The utility model relates to a current source device, in particular to a controllable weak current source. The structure of the weak current source comprises a sealing cavity taken as a high-pressure electrode, a collecting electrode arranged in the cavity, and an insulator arranged between the sealing cavity taken as the high-pressure electrode and the collecting electrode, wherein, an Alpha source is arranged in the cavity; the collecting electrode and the cavity are connected with the positive and the negative electrodes of an adjustable power supply respectively; and the collecting electrode is connected with the output terminal of the current. The weak current source provided by the utility model has the advantages of high output impedance, sustainable current output and controllable output current intensity.
Description
Technical field
The utility model relates to a kind of current-source arrangement, is specifically related to a kind of controllable weak current source.
Background technology
Need to need the big desirable weak current source of adjustable internal resistance in the technology application of weak current signal scale and measurement in weak current test, high insulation measurement, vacuum measurement, the measurement of pH value, acceleration analysis etc.The weak current source that can use now roughly has three kinds: what one, electronics method was realized produces weak current with burning voltage by high resistant, its controlled current but internal resistance is little; Two, capacity plate antenna is discharged and recharged with certain speed, the electric current of its generation can be enough little and internal resistance is enough big, will start anew but can only keep a few minutes; Three, the inner β of placement of ionization chamber makes in the source fixing normalized current source of exporting, and its output current is fixed, uncontrollable adjusting.
Summary of the invention
The purpose of this utility model is to provide a kind of novel controlled desirable weak current source structure, continues the desirable weak current that provides adjustable for relevant technology application.
The technical solution of the utility model is as follows: a kind of controllable weak current source, comprise a sealed cavity as high-field electrode, be provided with a passive electrode in the cavity, as being provided with insulator between the cavity of high-field electrode and the passive electrode, wherein, be provided with a α source in cavity, passive electrode and cavity are connected the both positive and negative polarity of regulated power supply respectively, and passive electrode is connected with current output terminal.
Further, aforesaid controllable weak current source, wherein, the activity in described α source is 33.3Kbq.
Further, aforesaid controllable weak current source, wherein, the change in voltage scope of described regulated power supply is 0～100V.
The beneficial effects of the utility model are as follows: this current source adopts similar ionization chamber structure, and the internal resistance of sealing ionization chamber itself is exactly the resistance of ionization chamber insulator basically, greatly about 10
15Ω to 10
16Ω or higher, it has possessed the enough big characteristics of internal resistance, its electric current that produces when measuring ray can be along with the strong and weak linear change of ray, inner and when adding suitable polarizing voltage when a suitable α source of activity being installed in this ionization chamber at ionization chamber the two poles of the earth, ionization chamber meeting output current, so just produce ideal current source, when changing polarizing voltage, just realized so-called controllable desirable weak current source.The utility model has overcome that the output impedance in other weak current source is low, output time is limited, output current is uncontrollable and shortcoming such as volume is big.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in detail.
As shown in Figure 1, controllable weak current source comprises a sealed cavity 1 as high-field electrode, leave air in the cavity, be provided with a passive electrode 2 in the cavity 1, as being provided with insulator 3 between the cavity 1 of high-field electrode and the passive electrode 2, be provided with a α source 5 in cavity 1, passive electrode 2 and cavity 1 are connected the both positive and negative polarity of regulated power supply (not drawing among the figure) respectively, and passive electrode 2 is connected with current output terminal 4.
Circuit theory of the present utility model as shown in Figure 2, inner and when adding suitable polarizing voltage when a suitable α source of activity being installed in this ionization chamber at ionization chamber the two poles of the earth, ionization chamber meeting output current, so just produced ideal current source, when changing polarizing voltage, just realized so-called controllable desirable weak current source.The activity in the α source that the utility model adopted is 33.3Kbq, any material all can, do not have specific (special) requirements, on cavity inner wall, the change in voltage scope that is added between passive electrode and the high-field electrode is 0～100V by screw retention, internal resistance is greater than 10
15Ω, this device produces 0～3PA weak current of a dullness along with the variation of voltage.Weak current provided by the utility model source has the output impedance height, sustainable output current, and the controlled advantage of output current intensity.
Claims (3)
1. controllable weak current source, comprise a sealed cavity (1) as high-field electrode, be provided with a passive electrode (2) in the cavity (1), as being provided with insulator (3) between the cavity (1) of high-field electrode and the passive electrode (2), it is characterized in that: in cavity (1), be provided with a α source (5), passive electrode (2) and cavity (1) are connected the both positive and negative polarity of regulated power supply respectively, and passive electrode (2) is connected with current output terminal (4).
2. controllable weak current as claimed in claim 1 source is characterized in that: the activity in described α source (5) is 33.3Kbq.
3. controllable weak current as claimed in claim 1 or 2 source is characterized in that: the change in voltage scope of described regulated power supply is 0～100V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201240411U CN201319153Y (en) | 2008-12-01 | 2008-12-01 | Controllable weak current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201240411U CN201319153Y (en) | 2008-12-01 | 2008-12-01 | Controllable weak current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201319153Y true CN201319153Y (en) | 2009-09-30 |
Family
ID=41197915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201240411U Expired - Fee Related CN201319153Y (en) | 2008-12-01 | 2008-12-01 | Controllable weak current source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201319153Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589503A (en) * | 2016-01-27 | 2016-05-18 | 中国计量科学研究院 | Method for generating DC constant-current current signals and constant current source device |
-
2008
- 2008-12-01 CN CNU2008201240411U patent/CN201319153Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105589503A (en) * | 2016-01-27 | 2016-05-18 | 中国计量科学研究院 | Method for generating DC constant-current current signals and constant current source device |
| CN105589503B (en) * | 2016-01-27 | 2017-11-07 | 中国计量科学研究院 | A kind of production method and constant-current source device of direct current continuous current signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090930 Termination date: 20151201 |
|
| EXPY | Termination of patent right or utility model |