CN205068213U - Low ripple digit electric current source - Google Patents
Low ripple digit electric current source Download PDFInfo
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- CN205068213U CN205068213U CN201520840377.8U CN201520840377U CN205068213U CN 205068213 U CN205068213 U CN 205068213U CN 201520840377 U CN201520840377 U CN 201520840377U CN 205068213 U CN205068213 U CN 205068213U
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- converter
- resistance
- current source
- amplifier
- low ripple
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Abstract
The utility model discloses a low ripple digit electric current source, including keyboard module, display module, controller, AD converter, DA converter and VI circuit, keyboard module, display module, DA converter, serial port communication module and AD converter are connected respectively to the controller, and the VI circuit is still connected to the AD converter, and the voltage source and the DA converter other end are still connected respectively to the VI circuit, U1, resistance R1 and triode VT1 are put including fortune to the VI circuit, and the DA converter is connected to resistance R1 one end, and the resistance R1 other end is connected fortune and is put U1 homophase end, and fortune is put the U1 output and is passed through resistance R2 and connect triode VT1 base. The utility model discloses the simple structure of low ripple digit electric current source system, with low costs, small, the precision is high, especially adapted using widely.
Description
Technical field
The utility model relates to a kind of current source, specifically a kind of low ripple digital current source.
Background technology
Current Control occupies critical role in galvanochemistry, modern biotechnology always, and many chemical reactions are able to rapidly, carry out efficiently under the effect of some strength electric current, and the technical field such as electrophoresis, electrodialysis be unable to do without the accurate control and measurement to electric current especially.In many reactions, the size of electric current can have influence on the ratio of the speed of reaction, direction and final reacting product, the excessive electric current of amplitude of variation can make experimental result become to be difficult to expect, the big current flow through instantaneously may burn out sample, even causes the consequence being difficult to expect.Therefore, produce a kind of cost low and also accurately efficiently current source in biochemical scientific research, have extremely important meaning.
Utility model content
The purpose of this utility model is to provide a kind of low ripple digital current source, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of low ripple digital current source, comprise Keysheet module, display module, controller, A/D converter, D/A converter and V/I circuit, described controller is connecting key disk module, display module, D/A converter, serial communication module and A/D converter respectively, A/D converter also connects V/I circuit, and V/I circuit also connects voltage source and the D/A converter other end respectively; V/I circuit comprises amplifier U1, resistance R1 and triode VT1, resistance R1 one end connects D/A converter, the resistance R1 other end connects amplifier U1 in-phase end, amplifier U1 output terminal is by resistance R2 connecting triode VT1 base stage, triode VT1 collector connects load RL and triode VT2 collector respectively, triode VT2 emitter connects A/D converter, stake resistance Rf and resistance R3 respectively, the resistance R3 other end connects amplifier U1 end of oppisite phase, amplifier U1 power end connects power supply VCC1, amplifier U1 earth terminal ground connection, the described load RL other end connects voltage source.
As further program of the utility model: described power supply VCC1 voltage is 5V.
As further program of the utility model: described amplifier U1 model is TLV2262.
As further program of the utility model: described controller adopts AVR single chip MEGA16.
As further program of the utility model: described A/D converter adopts MAX144.
As the utility model further scheme: described D/A converter adopts MAX539.
Compared with prior art, the beneficial effects of the utility model are: the utility model low ripple digital current source system structure is simple, and cost is low, and volume is little, and precision is high, is applicable to very much promoting the use of.
Accompanying drawing explanation
Fig. 1 is the circuit structure block diagram in low ripple digital current source;
Fig. 2 is the circuit diagram of V/I circuit in low ripple digital current source.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1 ~ 2, in the utility model embodiment, a kind of low ripple digital current source, comprise Keysheet module, display module, controller, A/D converter, D/A converter and V/I circuit, controller is connecting key disk module, display module, D/A converter, serial communication module and A/D converter respectively, A/D converter also connects V/I circuit, and V/I circuit also connects voltage source and the D/A converter other end respectively; V/I circuit comprises amplifier U1, resistance R1 and triode VT1, resistance R1 one end connects D/A converter, the resistance R1 other end connects amplifier U1 in-phase end, amplifier U1 output terminal is by resistance R2 connecting triode VT1 base stage, triode VT1 collector connects load RL and triode VT2 collector respectively, triode VT2 emitter connects A/D converter, stake resistance Rf and resistance R3 respectively, the resistance R3 other end connects amplifier U1 end of oppisite phase, amplifier U1 power end connects power supply VCC1, amplifier U1 earth terminal ground connection, the described load RL other end connects voltage source.
Power supply VCC1 voltage is 5V.
Amplifier U1 model is TLV2262.
Controller adopts AVR single chip MEGA16.
A/D converter adopts MAX144.
D/A converter adopts MAX539.
Principle of work of the present utility model is: refer to Fig. 1, and the utility model for controller, realizes the function of given value of current, current marching technique adjustment with AVR single chip MEGA16 by V/I change-over circuit; Utilize A/D converter to gather current feedback signal simultaneously, achieve current closed-loop FEEDBACK CONTROL; Also achieve serial communication function by serial communication module on this basis, available computers realizes the monitoring to this current source current.
Refer to Fig. 2, the Darlington circuit that V/I change-over circuit is made up of accurate amplifier TLV2262 and transistor VT1, VT2 is formed, accurate amplifier TLV2262 is used for voltage follower mode, the ideal output characteristic of transistor linearity section and the negative-feedback circuit of the degree of depth is utilized to obtain adjustable stable constant current output, system band load capacity is strong, its output area reaches 0 ~ 2A, pull-up resistor RL < 5 Ω, because Rf is used for current feedback, its precision is very large to the Accuracy of output current, therefore adopts large wire diameter constantan wire to make feedback resistance Rf.
Keysheet module adopts 4 × 4 determinant keyboards, except 0-9 10 numeric keys, has a current values input validation key, a current values amendment key, an electric current exports start key, and one increases 1 key, one adds 10 keys, and one subtracts 10 keys, and display module adopts OCMJ4X8.
By serial communication module, the function of being carried out given value of current and current monitoring by computing machine or other opertaing devices can be completed.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (6)
1. a low ripple digital current source, comprise Keysheet module, display module, controller, A/D converter, D/A converter and V/I circuit, it is characterized in that, described controller is connecting key disk module, display module, D/A converter, serial communication module and A/D converter respectively, A/D converter also connects V/I circuit, and V/I circuit also connects voltage source and the D/A converter other end respectively; V/I circuit comprises amplifier U1, resistance R1 and triode VT1, resistance R1 one end connects D/A converter, the resistance R1 other end connects amplifier U1 in-phase end, amplifier U1 output terminal is by resistance R2 connecting triode VT1 base stage, triode VT1 collector connects load RL and triode VT2 collector respectively, triode VT2 emitter connects A/D converter, stake resistance Rf and resistance R3 respectively, the resistance R3 other end connects amplifier U1 end of oppisite phase, amplifier U1 power end connects power supply VCC1, amplifier U1 earth terminal ground connection, the described load RL other end connects voltage source.
2. low ripple digital current source according to claim 1, is characterized in that, described power supply VCC1 voltage is 5V.
3. low ripple digital current source according to claim 1, is characterized in that, described amplifier U1 model is TLV2262.
4. low ripple digital current source according to claim 1, is characterized in that, described controller adopts AVR single chip MEGA16.
5. low ripple digital current source according to claim 1, is characterized in that, described A/D converter adopts MAX144.
6. low ripple digital current source according to claim 1, is characterized in that, described D/A converter adopts MAX539.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520840377.8U CN205068213U (en) | 2015-10-28 | 2015-10-28 | Low ripple digit electric current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520840377.8U CN205068213U (en) | 2015-10-28 | 2015-10-28 | Low ripple digit electric current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205068213U true CN205068213U (en) | 2016-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520840377.8U Expired - Fee Related CN205068213U (en) | 2015-10-28 | 2015-10-28 | Low ripple digit electric current source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205068213U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955378A (en) * | 2016-07-04 | 2016-09-21 | 广东海洋大学 | High-precision current source |
| CN107943188A (en) * | 2017-12-29 | 2018-04-20 | 贵州民族大学 | A kind of adjustable constant-current source device of output current |
| CN109473957A (en) * | 2018-12-24 | 2019-03-15 | 南宁职业技术学院 | Current sink circuit |
-
2015
- 2015-10-28 CN CN201520840377.8U patent/CN205068213U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955378A (en) * | 2016-07-04 | 2016-09-21 | 广东海洋大学 | High-precision current source |
| CN107943188A (en) * | 2017-12-29 | 2018-04-20 | 贵州民族大学 | A kind of adjustable constant-current source device of output current |
| CN109473957A (en) * | 2018-12-24 | 2019-03-15 | 南宁职业技术学院 | Current sink circuit |
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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: 20160302 Termination date: 20161028 |
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| CF01 | Termination of patent right due to non-payment of annual fee |