CN201965499U - Digital voltage controlled direct current constant current power supply device - Google Patents
Digital voltage controlled direct current constant current power supply device Download PDFInfo
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- CN201965499U CN201965499U CN2010206671524U CN201020667152U CN201965499U CN 201965499 U CN201965499 U CN 201965499U CN 2010206671524 U CN2010206671524 U CN 2010206671524U CN 201020667152 U CN201020667152 U CN 201020667152U CN 201965499 U CN201965499 U CN 201965499U
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Abstract
The utility model discloses a digital voltage controlled direct current constant current power supply device which comprises a voltage regulator connected with a power supply, a sampling resistance connected with a load in series, a sampling amplifier, a differential amplifier and a microprocessor, wherein two input ends of the sampling amplifier are respectively connected with both ends of the sampling resistance, the output end of the voltage regulator is connected with the load, the output end of the sampling amplifier is connected with the negative input end of the differential amplifier, the microprocessor is connected with the positive input end of the differential amplifier and is connected with the sampling resistance through an A/D sampling module, and the output end of the differential amplifier is connected with a regulation end of the voltage regulator. The digital voltage controlled direct current constant current power supply device can regulate the size of current of the load and maintain the dynamic stability of a circuit.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to the voltage-controlled dc constant current power supply device of a kind of numeral.
Background technology
Appearing at largely of LED light fixture brought the bright spot that is remarkable to energy-conserving and environment-protective, but at present, growing social demand has not been satisfied in the LED of simplification illumination.The emitting led running current of general highlighted white is 20mA, and operating voltage is about 3.7V, satisfy the LED illumination matrix of a series and parallel, and the technician must design a kind of burning voltage current drives that does not change with load LED number.
The patent No. is that the Chinese patent of ZL 200520107082.6 discloses a kind of constant-current source device, and it comprises Adjustable switch mu balanced circuit, load, current sampling resistor R1 and amplifier, as shown in Figure 1.Described current sampling resistor R1 connects with described load, after amplifying the voltage difference at resistance R 1 two ends, described amplifier flows to the feedback end of Adjustable switch mu balanced circuit, thereby regulate the dutycycle of described Adjustable switch mu balanced circuit, and then adjust output voltage, it is constant to keep output current.Yet, adopt this constant-current source device can not adjust the size of load current, that is to say, can not adjust the brightness of LED lighting device.Therefore, demand urgently providing the voltage-controlled dc constant current power supply device of a kind of improved numeral to overcome above-mentioned defective.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of numeral voltage-controlled dc constant current power supply device, and it can adjust the size of load current and the dynamic stability of holding circuit.
In order to solve the problems of the technologies described above, the utility model provides a kind of numeral voltage-controlled dc constant current power supply device, it comprises the voltage adjuster that is connected with power supply, the sampling resistor of connecting with load, the sampling amplifier that two input ends link to each other with the two ends of described sampling resistor respectively, differential amplifier and microprocessor, the output terminal of described voltage adjuster links to each other with described load, the output terminal of described sampling amplifier links to each other with the negative input end of described differential amplifier, described microprocessor links to each other with the positive input terminal of described differential amplifier and links to each other with described sampling resistor by the A/D sampling module, and the output terminal of described differential amplifier links to each other with the adjustment end of described voltage adjuster.
Compared with prior art, the microprocessor of the voltage-controlled dc constant current power supply device of numeral of the present utility model is sampled to the voltage signal at sampling resistor two ends by the A/D sampling module and is stored, set up a current-voltage transformation model, by to the preset value stored in real-time sampling magnitude of voltage and the microprocessor relatively after, setting value is exported to the positive input terminal of differential amplifier.And after the amplification of the sampled voltage at sampling resistor two ends process sampling amplifier homophase, export the negative input end of differential amplifier to, differential amplifier amplifies the difference of the setting voltage of the microprocessor of the sampled voltage of negative input end and positive input terminal output, output to the adjustment end of voltage adjuster, form close-loop feedback.The setting value of microprocessor output has determined the size of load current.When the setting value of microprocessor becomes big, the voltage that then feeds back to voltage adjuster adjustment end becomes big, the output voltage of voltage adjuster raises, load current increases, the output end voltage of sampling amplifier increases, the negative input end voltage of differential amplifier raises, and equates that up to the voltage of the positive-negative input end of differential amplifier system realizes dynamic stability.And when the setting value of microprocessor constant and when having certain situation to make load current increase, the voltage at sampling resistor two ends increases, it is big that the sampling amplifier output voltage becomes thereupon, and the differential amplifier output voltage reduces, the voltage adjuster output voltage diminishes, thereby load current is reduced, and then kept the dynamic stability of load current, vice versa.That is to say that the voltage-controlled dc constant current power supply device of numeral of the present utility model can be stablized the size of adjusting load current.
As preferred embodiment of the present utility model, be in series with slide rheostat between the output terminal of described sampling amplifier and the negative input end, the slide plate of described slide rheostat is connected with the output terminal of described sampling amplifier.This slide rheostat is used to adjust the voltage magnitude of described differential amplifier negative input end.
Preferably, described load two ends are parallel with a diode, and the negative pole of described diode links to each other with regulator output, and this diode is used for preventing that lead-in wire is long makes circuit reverse induction voltage occur and damage circuit.
Preferably, described sampling resistor is a copper-manganese resistance, and its power is big, can reduce the influence to the voltage-controlled dc constant current power supply device of whole numeral, and avoids being burnt out.
By following description also in conjunction with the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used to explain embodiment of the present utility model.
Description of drawings
Fig. 1 is the structural representation of existing constant-current source device.
Fig. 2 is the voltage-controlled dc constant current power supply manipulated or operated apparatus of the utility model numeral.
Embodiment
With reference now to accompanying drawing, describe embodiment of the present utility model, the similar elements label is represented similar elements in the accompanying drawing.As mentioned above, the utility model provides a kind of numeral voltage-controlled dc constant current power supply device, and it can adjust the size of load current and the dynamic stability of holding circuit.
Elaborate the technical scheme of the utility model embodiment below in conjunction with accompanying drawing.As shown in Figure 2, the digital voltage-controlled dc constant current power supply device of present embodiment comprises the voltage adjuster U1 that is connected with power Vcc, the sampling resistor R5 that connects with load J1, sampling amplifier U2, differential amplifier U3 and microprocessor, the output terminal of described voltage adjuster U1 links to each other with described load J1, two input ends of described sampling amplifier U2 are connected to the two ends of described sampling resistor R5, and output terminal links to each other with the negative input end of described differential amplifier U3, described microprocessor links to each other with the positive input terminal of described differential amplifier U3, shown in A among the figure, and described microprocessor links to each other with described sampling resistor R5 (figure does not show) by the A/D sampling module, and the output terminal of described differential amplifier U3 links to each other with the adjustment end ADJ of described voltage adjuster U1.
Concrete, described voltage adjuster U1 is preferably LM350, and described sampling resistor R5 is preferably high-power copper-manganese resistance, and described sampling amplifier U2 is preferably ultra-low noise amplifier AD797, to reduce The noise.Described differential amplifier U3 is preferably high-operational amplifier OP707, so that high-precision comparative result to be provided.
Further, be in series with slide rheostat R11 between the output terminal of described sampling amplifier U2 and the negative input end, the slide plate of described slide rheostat R11 is connected with the output terminal of described sampling amplifier U2.This slide rheostat R11 is used to adjust the voltage magnitude of described differential amplifier U3 negative input end.
Further, described load J1 two ends are parallel with a diode D4, and the negative pole of described diode D4 links to each other with the output terminal of voltage adjuster U1, this diode D4 can make reverse induction voltage constitute the closed-loop path through D4, thereby prevents that long the making of lead-in wire from reverse induction voltage occurring in the circuit and damage circuit.
The microprocessor of the digital voltage-controlled dc constant current power supply device of present embodiment is sampled to the voltage signal at sampling resistor R5 two ends by the A/D sampling module and is stored, set up a current-voltage transformation model, by to the preset value stored in real-time sampling magnitude of voltage and the microprocessor relatively after, setting value is exported to the positive input terminal of differential amplifier U3.And after the amplification of the sampled voltage at sampling resistor R5 two ends process sampling amplifier U2 homophase, export the negative input end of differential amplifier U3 to, differential amplifier U3 amplifies the difference of the setting voltage of the microprocessor of the sampled voltage of negative input end and positive input terminal output, output to the adjustment end of voltage adjuster U1, form close-loop feedback.The setting value of described microprocessor output has determined the size of load current.The setting value of exporting when microprocessor becomes big, the voltage that feeds back to voltage adjuster U1 adjustment end ADJ so becomes big, the output voltage of voltage adjuster U1 raises, load current increases, the output end voltage of sampling amplifier U2 increases, the negative input end voltage of differential amplifier U3 raises, and equates that up to the voltage of the positive-negative input end of differential amplifier U3 system realizes dynamic stability.And when the setting value of microprocessor constant and when having certain situation to make load J1 electric current increase, the voltage at sampling resistor R5 two ends increases, sampling amplifier U2 output voltage becomes big thereupon, and differential amplifier U3 output voltage reduces, voltage adjuster U1 output voltage diminishes, thereby load J1 electric current is reduced, and then kept the dynamic stability of load J1 electric current, vice versa.That is to say that the voltage-controlled dc constant current power supply device of numeral of the present utility model can be stablized the size of adjusting load current, described load can be the LED lighting device, by the voltage-controlled dc constant current power supply device of this numeral can stable regulation LED lighting device brightness.
Claims (4)
1. voltage-controlled dc constant current power supply device of numeral, comprise the voltage adjuster that is connected with power supply, the sampling amplifier that links to each other with the two ends of described sampling resistor respectively with the sampling resistor of load series connection and two input ends, the output terminal of described voltage adjuster links to each other with described load, it is characterized in that: also comprise differential amplifier and microprocessor, the output terminal of described sampling amplifier links to each other with the negative input end of described differential amplifier, described microprocessor links to each other with the positive input terminal of described differential amplifier and links to each other with described sampling resistor by the A/D sampling module, and the output terminal of described differential amplifier links to each other with the adjustment end of described voltage adjuster.
2. the voltage-controlled dc constant current power supply device of numeral according to claim 1 is characterized in that: be in series with slide rheostat between the output terminal of described sampling amplifier and the negative input end, the slide plate of described slide rheostat is connected with the output terminal of described sampling amplifier.
3. the voltage-controlled dc constant current power supply device of numeral according to claim 2 is characterized in that: described load two ends are parallel with a diode, and the negative pole of described diode links to each other with regulator output.
4. according to the voltage-controlled dc constant current power supply device of each described numeral of claim 1-3, it is characterized in that: described sampling resistor is a copper-manganese resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206671524U CN201965499U (en) | 2010-12-20 | 2010-12-20 | Digital voltage controlled direct current constant current power supply device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206671524U CN201965499U (en) | 2010-12-20 | 2010-12-20 | Digital voltage controlled direct current constant current power supply device |
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| Publication Number | Publication Date |
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| CN201965499U true CN201965499U (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206671524U Expired - Fee Related CN201965499U (en) | 2010-12-20 | 2010-12-20 | Digital voltage controlled direct current constant current power supply device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789251A (en) * | 2012-05-21 | 2012-11-21 | 上海显恒光电科技股份有限公司 | Current adjustable constant current circuit |
| CN107248696A (en) * | 2017-06-15 | 2017-10-13 | 江汉大学 | A kind of self-compensation type semiconductor laser |
| CN109521077A (en) * | 2018-11-13 | 2019-03-26 | 国电南瑞科技股份有限公司 | A kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction device |
-
2010
- 2010-12-20 CN CN2010206671524U patent/CN201965499U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789251A (en) * | 2012-05-21 | 2012-11-21 | 上海显恒光电科技股份有限公司 | Current adjustable constant current circuit |
| CN107248696A (en) * | 2017-06-15 | 2017-10-13 | 江汉大学 | A kind of self-compensation type semiconductor laser |
| CN109521077A (en) * | 2018-11-13 | 2019-03-26 | 国电南瑞科技股份有限公司 | A kind of two-wave interpretation formula online Analysis Apparatus of Permanganate Index titration end-point instruction device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20131220 |