CN204495862U - A kind of constant current generating means - Google Patents
A kind of constant current generating means Download PDFInfo
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- CN204495862U CN204495862U CN201520226784.XU CN201520226784U CN204495862U CN 204495862 U CN204495862 U CN 204495862U CN 201520226784 U CN201520226784 U CN 201520226784U CN 204495862 U CN204495862 U CN 204495862U
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- CN
- China
- Prior art keywords
- generating means
- constant current
- current generating
- module
- correctional tube
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- 230000005669 field effect Effects 0.000 claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 239000005955 Ferric phosphate Substances 0.000 claims description 7
- 229940032958 ferric phosphate Drugs 0.000 claims description 7
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 claims description 7
- 229910000399 iron(III) phosphate Inorganic materials 0.000 claims description 7
- 229910052744 lithium Inorganic materials 0.000 claims description 7
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000007689 inspection Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Abstract
The utility model discloses a kind of constant current generating means, belong to electric power tool field, when solving testing inspection in prior art, the too low technical matters affecting measuring accuracy of sampling voltage, the constant current generating means that the utility model provides comprises linear power source circuit, be connected with supplying cell, stepup transformer, control circuit module, Correctional tube module in linear power source circuit, Correctional tube module is connected with output terminal, Correctional tube module comprises field effect transistor.The utility model is applied in the testers such as instrument for measuring DC resistance, earth resistance tester or transformer coil instrument for measuring DC resistance.
Description
[technical field]
The utility model relates to a kind of constant current generating means.
[background technology]
The instruments such as instrument for measuring DC resistance, earth resistance tester, transformer coil instrument for measuring DC resistance are all generally use in industry spot, testing ground generally lacks power supply, for portable instrument, require to provide electric supply installation to test to facilitate on-the-spot test personnel on a tester.The constant current generating means of D.C. high-current is widely used in power test instrument, but because tested object resistance is very little, some resistance is low to moderate the micro-ohm order of magnitude, according to Ohm law, sampling voltage can be caused too low, the precision that impact is measured.
[summary of the invention]
The technical matters that the utility model solves is to provide a kind of constant current generating means, and ensureing provides higher output voltage.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of constant current generating means, comprise linear power source circuit, be connected with supplying cell, stepup transformer, control circuit module, Correctional tube module in described linear power source circuit in turn, described Correctional tube module is connected with output terminal, described Correctional tube module comprises field effect transistor.
Further, some described field effect transistor parallel connections form described Correctional tube module.
Further, described field effect transistor is low on-resistance field effect transistor.
Further, described supplying cell is ferric phosphate lithium cell.
Further, described stepup transformer is DC-DC power module.
Further, described constant current generating means also comprises electrical current sampling circuit module, and described Correctional tube module connects described output terminal by described electrical current sampling circuit module, and described electrical current sampling circuit module connects described control circuit module.
The beneficial effects of the utility model:
Constant current generating means of the present utility model, the voltage of supplying cell raises by stepup transformer, control circuit module controls the voltage and current exported, by the output power in Correctional tube module stabilized voltage supply and output voltage, and, the field effect transistor adopted can work under the condition of very low-voltage, dependable performance.Therefore constant-current supply device can provide large electric current, and constant current accuracy is high, ripple factor is little.
These features of the present utility model and advantage will embodiment below, exposure detailed in accompanying drawing.
[accompanying drawing explanation]
Below in conjunction with accompanying drawing, the utility model is described further:
Fig. 1 is principle schematic of the present utility model.
[embodiment]
The technical scheme of accompanying drawing to the utility model embodiment below in conjunction with the utility model embodiment is explained and illustrated, but following embodiment is only preferred embodiment of the present utility model, and not all.Based on the embodiment in embodiment, those skilled in the art under the prerequisite not making creative work obtain other embodiment, all belong to protection domain of the present utility model.
With reference to figure 1, shown a kind of constant current generating means, comprises linear power source circuit, is connected with supplying cell 1, stepup transformer 2, control circuit module 3, Correctional tube module 4 in linear power source circuit, Correctional tube module 4 is connected with output terminal 6, Correctional tube module 4 comprises field effect transistor.The voltage of supplying cell 1 raises by stepup transformer 2, and control circuit module 3 controls the voltage and current exported, by the output power in Correctional tube module 4 stabilized power source and output voltage.Constant-current supply device provides large electric current, constant current accuracy is high, ripple factor is little.The field effect transistor adopted can work under the condition of very low-voltage, dependable performance.
Wherein constant-current source circuit form is a lot, can adopt switching power circuit, also can adopt linear power source circuit.Have employed the reason of linear power source circuit: one be testing tool it is desirable that the constant-current source circuit of high precision, low-ripple coefficient, adopt switching power circuit, can cause high frequency interference, ripple is also larger.Two is that switching power circuit is complicated, and supply voltage is too low, is difficult to accomplish high-level efficiency.
The supplying cell 1 adopted is ferric phosphate lithium cell.The selection of supplying cell goes from two aspects to consider, one is that battery wants can Reusability, must select rechargeable battery; Two is output currents that battery can provide larger, and namely the internal resistance of battery is enough little.Therefore have selected the power supply of ferric phosphate lithium cell as constant-current device.Ferric phosphate lithium cell have long service life, can the feature such as minimum, the memory-less effect of high current charge-discharge, internal resistance.
Because the output voltage of ferric phosphate lithium cell only has 3.7V, electric discharge lower voltage limit only has 2V.In order to provide higher constant current source output voltage as far as possible, field effect transistor needs the field effect transistor selecting big current and low resistance, to improve constant-current accuracy.For this consideration, the field effect transistor selected is low on-resistance field effect transistor.
Further, Correctional tube module 4 comprises the field effect transistor of some parallel connections.The conducting resistance of further reduction Correctional tube module 4, thus the output voltage improving constant current source.
In the utility model, stepup transformer 2 is DC-DC power module.DC-DC power module precision is high, and module input voltage is ferric phosphate lithium cell, and output voltage designs according to the needs of control circuit.
And, constant current generating means also comprises electrical current sampling circuit module 5, Correctional tube module 4 connects output terminal 6 by electrical current sampling circuit module 5, sample circuit module 5 detects the magnitude of voltage exported, and magnitude of voltage is fed back, control circuit adjusts output valve according to value of feedback, to reach higher degree of accuracy.
By above-described embodiment, the purpose of this utility model is reached by fully effective.The personage being familiar with this technology should be understood that the content that the utility model includes but not limited to accompanying drawing and describes in embodiment above.Any amendment not departing from function and structure principle of the present utility model all will comprise within the scope of the appended claims.
Claims (6)
1. a constant current generating means, it is characterized in that: comprise linear power source circuit, be connected with supplying cell, stepup transformer, control circuit module, Correctional tube module in described linear power source circuit in turn, described Correctional tube module is connected with output terminal, described Correctional tube module comprises field effect transistor.
2. a kind of constant current generating means according to claim 1, is characterized in that: some described field effect transistor parallel connections form described Correctional tube module.
3. a kind of constant current generating means according to claim 2, is characterized in that: described field effect transistor is low on-resistance field effect transistor.
4. a kind of constant current generating means according to claim 1 or 2 or 3, is characterized in that: described supplying cell is ferric phosphate lithium cell.
5. a kind of constant current generating means according to claim 1 or 2 or 3, is characterized in that: described stepup transformer is DC-DC power module.
6. a kind of constant current generating means according to claim 1, it is characterized in that: described constant current generating means also comprises electrical current sampling circuit module, described Correctional tube module connects described output terminal by described electrical current sampling circuit module, and described electrical current sampling circuit module connects described control circuit module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520226784.XU CN204495862U (en) | 2015-04-15 | 2015-04-15 | A kind of constant current generating means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520226784.XU CN204495862U (en) | 2015-04-15 | 2015-04-15 | A kind of constant current generating means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204495862U true CN204495862U (en) | 2015-07-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520226784.XU Active CN204495862U (en) | 2015-04-15 | 2015-04-15 | A kind of constant current generating means |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204495862U (en) |
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2015
- 2015-04-15 CN CN201520226784.XU patent/CN204495862U/en active Active
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |