CN202093066U - Constant-current source device - Google Patents
Constant-current source device Download PDFInfo
- Publication number
- CN202093066U CN202093066U CN201120121859XU CN201120121859U CN202093066U CN 202093066 U CN202093066 U CN 202093066U CN 201120121859X U CN201120121859X U CN 201120121859XU CN 201120121859 U CN201120121859 U CN 201120121859U CN 202093066 U CN202093066 U CN 202093066U
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- constant
- current source
- source device
- transistor circuit
- current
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Abstract
The utility model discloses a constant-current source device, which comprises a transistor circuit. The transistor circuit is respectively connected with an ampere meter and a direct-current voltage source, and the ampere meter is provided with at least two ranges. A light emitting diode is arranged on each range, a current direction converting switch is arranged between the ampere meter and the transistor circuit, the direct-current voltage source is a 90V dry battery, and a head display of the ampere meter is an LED digital display. The constant-current source device has the advantages that tests of high and low electric resistivity of silicon materials can be realized, the measuring range is widened and the test accuracy is improved; the constant-current source device is slightly interfered by external environment, so that testing is more stable; and maintenance is easy and cost is reduced.
Description
Technical field
The utility model relates to a kind of Constant Electric Current pressure device, especially relates to a kind of constant-current source device.
Background technology
Constant current source equipment is extensively applied in the various fields as a primary clustering of circuit.Yet As time goes on, catabiosis has in various degree appearred in the constant current source equipment of producing in early days, this has just caused, and measuring accuracy and degree of stability reduce greatly in such as measuring processes such as resistivity, and error is bigger than normal, therefore can not satisfy the test request of present stage.
In order to address the above problem, can solve by two kinds of methods: 1. change the aging components and parts in the existing constant current source equipment, though the function by this kind method constant current source equipment improves, but measuring accuracy and degree of stability are on the low side, error is still bigger, and high resistance polysilicon resistivity cannot be tested; 2. purchase new constant current source equipment, because the constant current source equipment of newly producing directly adopts Alternating Current Power Supply, it is bigger disturbed by outer signals, therefore test environment is required relatively stricter, purchase instrument expense height, and owing to all adopting integrated components and parts to cause maintenance difficulty bigger.In sum, hope can design on the basis of original constant current source equipment and overcome the problems referred to above.
The utility model content
The utility model has overcome shortcoming of the prior art, and a kind of constant-current source device is provided, and can increase the measuring accuracy of reometer.
The technical solution of the utility model is: a kind of constant-current source device, comprise transistor circuit, and transistor circuit is connected with direct voltage source with reometer respectively, and described reometer has at least two ranges.
Each range is provided with light emitting diode; Between described reometer and transistor circuit, be provided with the direction of current switch; Described direct voltage source is the 90V dry cell; The gauge outfit of described reometer shows employing LED nixie display.
Compared with prior art, the utility model has the advantages that:
1, the method for shunting by parallel resistance, the reometer of 50uA range in original constant current source equipment is extended to has 6 ranges (i.e. 1 uA, 10 uA, 100 uA, 1 mA, 10 mA, 100 mA), and the selection of 6 ranges can be realized by selector switch, thereby satisfied test, enlarged its measurement range and increased measuring accuracy the height silicon material resistivity; Compare with the instrument that domestic manufacturers produce, it is little that this constant current source has the ripple interference, and the characteristics that stable testing is high can be measured high-resistance semi-conductor material, reach 1*10
6Ω .cm;
2, replace the numerical value Presentation Function of reometer by employing LED nixie display, thereby reduce reading error, improve the accuracy of measuring;
3, owing to adopted the direction of current switch that is connected with transistor current to change the direction of current of probe 1 and probe 4, therefore can judge the mixed type zone in the silicon materials and will commutate before and after institute's measuring resistance rate average, thereby further improve the accuracy of testing;
4, adopted 6 light emitting diodes to be connected with 6 ranges, the lumination of light emitting diode of correspondence when selecting the range gear, this makes operation obviously directly perceived more;
5, adopt independent 90V dry cell power supply, be subjected to external environmental interference little, thereby make that test is more stable;
6, internal circuit is made of a large amount of separating components, rather than highly integrated components and parts, so maintenance difficulty is little;
7, purchasing the constant-current source device newly produced at present needs about 10,000 yuan, and the cost of reequiping an existing constant-current source device has only about 1500 yuan, so reduced cost.
Description of drawings
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is configuration of circuit figure of the present utility model.
Embodiment
A kind of constant-current source device, as shown in Figure 1, comprise transistor circuit, transistor circuit is connected with direct voltage source with reometer respectively, the gauge outfit of reometer is extended to the reometer with a plurality of ranges by shunt resistance in parallel, and the selection of each range is led the switch realization by dialling; Each range is provided with light emitting diode, is used for the demonstration to each range gear, makes operation more directly perceived obviously; It is the O shelves that gear is provided with digital voltmeter school zero span, is used to reduce measuring error; The gauge outfit of reometer is provided with slightly, fine tuning knob his-and-hers watches head current shows that effect is accurate; Electric current I, electricalresistivity and digital voltmeter school zero span are all led the switch switching by dialling.The electrode input end of reometer is connected with cathode output end with the cathode output end of described transistor circuit respectively with negative input.Between reometer and transistor circuit, be provided with the direction of current switch; Described direct voltage source is the 90V dry cell.The gauge outfit of reometer shows can adopt the LED nixie display, to reduce reading error, improves the accuracy of measuring.
It is bias voltage that this constant current source has adopted the two-stage stabilivolt, improves the stable of base voltage like this, makes transistorized inflow base current Ib invariable, and collector current Ic is also invariable, thereby has played the effect of constant current.
The key technical indexes of the present utility model is as follows:
1. electric current output: DC current 0 ~ 100mA and adjustable continuously
2. range: 1uA, 10 μ A, 100 μ A, 1mA, 10mA, 100mA
3. the degree of stability of instrument≤0.5%, test resistance rate 10
-3≤ ρ≤10
6
Claims (5)
1. a constant-current source device comprises transistor circuit, and transistor circuit is connected with direct voltage source with reometer respectively, it is characterized in that: described reometer has at least two ranges.
2. constant-current source device according to claim 1 is characterized in that: each range is provided with light emitting diode.
3. constant-current source device according to claim 1 is characterized in that: be provided with the direction of current switch between described reometer and transistor circuit.
4. constant-current source device according to claim 1 is characterized in that: described direct voltage source is the 90V dry cell.
5. constant-current source device according to claim 1 is characterized in that: the gauge outfit of described reometer shows employing LED nixie display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120121859XU CN202093066U (en) | 2011-04-23 | 2011-04-23 | Constant-current source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120121859XU CN202093066U (en) | 2011-04-23 | 2011-04-23 | Constant-current source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202093066U true CN202093066U (en) | 2011-12-28 |
Family
ID=45368126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120121859XU Expired - Fee Related CN202093066U (en) | 2011-04-23 | 2011-04-23 | Constant-current source device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202093066U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109407027A (en) * | 2018-11-21 | 2019-03-01 | 苏州英特模汽车科技有限公司 | Large range high precision current sensor metering method |
-
2011
- 2011-04-23 CN CN201120121859XU patent/CN202093066U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109407027A (en) * | 2018-11-21 | 2019-03-01 | 苏州英特模汽车科技有限公司 | Large range high precision current sensor metering method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20121025 Granted publication date: 20111228 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20130425 Granted publication date: 20111228 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20130625 Granted publication date: 20111228 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20131225 Granted publication date: 20111228 |
|
| PP01 | Preservation of patent right |
Effective date of registration: 20131225 Granted publication date: 20111228 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20141225 Granted publication date: 20111228 |
|
| RINS | Preservation of patent right or utility model and its discharge | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20140423 |