CN203012564U - Numerical controlled constant-current source - Google Patents
Numerical controlled constant-current source Download PDFInfo
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- CN203012564U CN203012564U CN 201220667900 CN201220667900U CN203012564U CN 203012564 U CN203012564 U CN 203012564U CN 201220667900 CN201220667900 CN 201220667900 CN 201220667900 U CN201220667900 U CN 201220667900U CN 203012564 U CN203012564 U CN 203012564U
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Abstract
The utility model discloses a numerical controlled constant-current source, and belongs to the technical field of power supplies. The numerical controlled constant-current source comprises an input module, a constant current output module, a singlechip control module, a digital-to-analogue conversion (DAC) module, a voltage feedback module and an analog-digital conversion module. An output end of the input module is connected with a first input end of the singlechip control module, a first output end of the singlechip control module is connected with an input end of the DAC module, and an output end of the DAC module is connected with an input end of the constant current output module. A first output end of the constant current output module is connected with an input end of the voltage feedback module, an output end of the voltage feedback module is connected with an input end of the analog-digital conversion module, and an output end of the analog-digital conversion module is connected with a second input end of the singlechip control module. A second output end of the constant current output module outputs a constant current, and the value of the constant current is equal to the value of currents which are input by an input end of the input module. High precision of the constant current is guaranteed, and meanwhile, the numerical controlled constant-current source is small in size, convenient to carry, and low in cost.
Description
Technical field
The utility model relates to a kind of digital-control constant-flow source, belongs to power technique fields.
Background technology
Constant current source is a widely used assembly in circuit, its essence is and utilize device that electric current is fed back, and the power supply state of dynamic adjustments equipment, thus make electric current be tending towards constant.At present, in the debug process of new product, often need to use standard constant current signal source, mostly be simulation signal generator but existing standard constant current signal source provides, these signal sources are all regulated electric current by potentiometer, therefore precision is not high, and the volume of these signal sources is all larger, thereby causes production cost also very high.
Summary of the invention
The utility model provides a kind of digital-control constant-flow source, and to solve the problem that in prior art, the simulation signal generator precision is not high, volume is large and cost is high, the utility model adopts following technical scheme for this reason:
a kind of digital-control constant-flow source, comprise load module, the constant current output module, single chip control module, D/A converter module, Voltage Feedback module and analog-to-digital conversion module, wherein, the output terminal of load module is connected with the first input end of single chip control module, the first output terminal of single chip control module is connected with the input end of D/A converter module, the output terminal of D/A converter module is connected with the input end of constant current output module, the first output terminal of constant current output module is connected with the input end of Voltage Feedback module, the output terminal of Voltage Feedback module is connected with the input end of analog-to-digital conversion module, the output terminal of analog-to-digital conversion module is connected with the second input end of single chip control module, the second output terminal output steady current of constant current output module, the value of described steady current equates with the current value of the input end of load module input.
The digital-control constant-flow source that the utility model embodiment provides allows to adjust in real time the steady current of constant current output module output by the Voltage Feedback module is set, to guarantee the high precision of steady current, this digital-control constant-flow source volume is little simultaneously, be easy to carry and cost low.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, during the below will describe embodiment, the accompanying drawing of required use is done to introduce simply, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of a kind of digital-control constant-flow source described in the utility model;
Fig. 2 is the structural representation of Voltage Feedback module 5 in a kind of digital-control constant-flow source described in the utility model;
Fig. 3 is the structural representation of single chip control module 3 and analog-to-digital conversion module 6 in a kind of digital-control constant-flow source described in the utility model;
Fig. 4 is the structural representation of constant current output module 2 and D/A converter module 4 in a kind of digital-control constant-flow source described in the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
a kind of digital-control constant-flow source that provides at the utility model embodiment, as shown in Figure 1, comprise load module 1, constant current output module 2, single chip control module 3, D/A converter module 4, Voltage Feedback module 5 and analog-to-digital conversion module 6, wherein, the output terminal of load module 1 is connected with the first input end of single chip control module 3, the first output terminal of single chip control module 3 is connected with the input end of D/A converter module 4, the output terminal of D/A converter module 4 is connected with the input end of constant current output module 2, the first output terminal of constant current output module 2 is connected with the input end of Voltage Feedback module 5, the output terminal of Voltage Feedback module 5 is connected with the input end of analog-to-digital conversion module 6, the output terminal of analog-to-digital conversion module 6 is connected with the second input end of single chip control module 3, the second output terminal output steady current of constant current output module 2, the value of described steady current equates with the current value of the input end input of load module 1.As optionally, load module 1 can adopt the key-press input mode, and the numerical range of the electric current of its input is the 0-2000 milliampere.
In above-mentioned digital-control constant-flow source, the structure of Voltage Feedback module 5 can as shown in Figure 2, comprise: resistance R 6, R7, R8 and R9 and operational amplifier U5, terminal J1.The Voltage Feedback module 5 of the voltage of certain device when being used for feeding back the steady current of exporting by the second output terminal of constant current output module, it specifically can detect the voltage at resistance R 9 two ends in Fig. 2 and/or the voltage at resistance R 8 two ends, this voltage is sent in single chip control module 3 by analog-to-digital conversion module 6, thereby consisted of closed-loop feedback circuit with constant current output module 2 and D/A converter module 4, exported the precision of steady current with the second output terminal that has improved the constant current output module.Wherein said certain device can comprise resistance, electric capacity or inductance etc.
In above-mentioned digital-control constant-flow source, the structure of single chip control module 3 and analog-to-digital conversion module 6 can be as shown in Figure 3, comprise: control chip U1, capacitor C 10, capacitor C 11 and crystal oscillator X1, wherein consider processing speed and the accuracy requirement of digital-control constant-flow source, control chip U1 can adopt the 89C51 chip of MCS-51 series.Single chip control module 3 is used for calculating current value by described specific voltage by the voltmeter of the certain device of the input end input of described analog-to-digital conversion module 6, and the current value of the input end of the current value that passes through described specific voltage that will calculate and load module 1 input compares, if the current value by described specific voltage is unequal with the current value that the input end of load module is inputted, the first output terminal of readjusting described single chip control module 3 is exported to the value of the input end of described D/A converter module 4.Otherwise, work on.Wherein analog-to-digital conversion module comprises: resistance R 10, diode D1, crystal oscillator X2, modulus conversion chip U7 and capacitor C 12, C13, C14 and C15.
Further, if above-mentioned single chip control module 3 is also unequal for the current value that the input end of the current value that passes through described specific voltage and load module 1 is inputted, the sound that gives the alarm, and interrupt all outputs of described single chip control module 3.If single chip control module 3 also can be used for surpassing particular value by the difference between the current value of the input end input of the current value of described specific voltage and load module 1, the sound that gives the alarm, and interrupt all outputs of described single chip control module.
In above-mentioned digital-control constant-flow source, the structure of constant current output module 2 and D/A converter module 4 can be as shown in Figure 4, wherein constant current output module 2 comprises: resistance R 3, R4 and R5 and operational amplifier U3 and triode Q1, Q2, Q3 and Q4, wherein operational amplifier U3 can adopt operational amplifier OP27, and it can guarantee good load driving force; And triode Q1 and Q3 adopt the complex method of low-power transistor C2500 and large power triode BU508 and the complex method of triode Q2 and Q4 employing low-power transistor C2500 and large power triode BU508, it can guarantee that the electric current that drives load reaches 2000mA in the situation that improved enlargement factor, uses simultaneously two complex pipe type of drive can also guarantee that triode is unlikely to affect normal operation because of overheated.Wherein D/A converter module 4 comprises: analog-digital chip U2, capacitor C 1 and resistance R 1 and R2, wherein in order to have good gain and the serial digital-analog conversion of the linearity, analog-digital chip U2 can adopt analog-digital chip MAX531, thus the high-precision output of the system that realized.
In above-mentioned digital-control constant-flow source, can also comprise display module, the input end of this display module is connected with the second output terminal of single chip control module 3, the magnitude of voltage of the electric current number that described display module is inputted for the input end that shows load module 1, the input of the input end of analog-to-digital conversion module 6 or the current value that passes through described specific voltage that described single chip control module 3 calculates.
In above-mentioned digital-control constant-flow source, can also comprise power module, the output terminal of this power module is connected with the 3rd input end of single chip control module.
the Voltage Feedback module that is provided with the digital-control constant-flow source that the utility model embodiment provides detects the voltage of constant current source output module load and/or the voltage of feedback resistance, and be sent to single chip control module to consist of a closed loop circuit by analog-to-digital conversion module, single chip control module is controlled the electric current of constant current source output module output in real time according to the variation of feedback voltage simultaneously, so that the current value of constant current output module output does not change because of the change of load, thereby guaranteed constant-current characteristics, thereby guaranteed the high precision of steady current, this digital-control constant-flow source volume is little simultaneously, be easy to carry and cost low.
It should be noted that in the embodiment of above-mentioned digital-control constant-flow source, included modules is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional module also just for the ease of mutual differentiation, is not limited to protection domain of the present utility model.
The above; it is only the better embodiment of the utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model embodiment discloses; the variation that can expect easily or replacement are within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (5)
1. digital-control constant-flow source, comprise load module and constant current output module, it is characterized in that, also comprise single chip control module, D/A converter module, Voltage Feedback module and analog-to-digital conversion module, wherein, the output terminal of load module is connected with the first input end of single chip control module, the first output terminal of single chip control module is connected with the input end of D/A converter module, the output terminal of D/A converter module is connected with the input end of constant current output module, the first output terminal of constant current output module is connected with the input end of Voltage Feedback module, the output terminal of Voltage Feedback module is connected with the input end of analog-to-digital conversion module, the output terminal of analog-to-digital conversion module is connected with the second input end of single chip control module, the second output terminal output steady current of constant current output module, the value of described steady current equates with the current value of the input end of load module input.
2. digital-control constant-flow source according to claim 1, is characterized in that, described Voltage Feedback module, the voltage of certain device when being used for feeding back the steady current of exporting by the second output terminal of constant current output module.
3. digital-control constant-flow source according to claim 2, is characterized in that, described certain device comprises resistance, electric capacity or inductance.
4. according to claim 1-3 described digital-control constant-flow sources of any one, is characterized in that, also comprises display module, and the input end of described display module is connected with the second output terminal of single chip control module.
5. according to claim 1-3 described digital-control constant-flow sources of any one, is characterized in that, also comprises power module, and the output terminal of described power module is connected with the 3rd input end of single chip control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220667900 CN203012564U (en) | 2012-12-06 | 2012-12-06 | Numerical controlled constant-current source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220667900 CN203012564U (en) | 2012-12-06 | 2012-12-06 | Numerical controlled constant-current source |
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| CN203012564U true CN203012564U (en) | 2013-06-19 |
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| CN 201220667900 Expired - Lifetime CN203012564U (en) | 2012-12-06 | 2012-12-06 | Numerical controlled constant-current source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103034273A (en) * | 2012-12-06 | 2013-04-10 | 北京赛德高科铁道电气科技有限责任公司 | Numerically-controlled constant current source |
| CN104503337A (en) * | 2014-12-31 | 2015-04-08 | 桂林铭瑶电子科技有限公司 | Numerically controlled constant current source circuit based on DSP |
-
2012
- 2012-12-06 CN CN 201220667900 patent/CN203012564U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103034273A (en) * | 2012-12-06 | 2013-04-10 | 北京赛德高科铁道电气科技有限责任公司 | Numerically-controlled constant current source |
| CN103034273B (en) * | 2012-12-06 | 2015-01-28 | 北京赛德高科铁道电气科技有限责任公司 | Numerically-controlled constant current source |
| CN104503337A (en) * | 2014-12-31 | 2015-04-08 | 桂林铭瑶电子科技有限公司 | Numerically controlled constant current source circuit based on DSP |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130619 |