CN203537599U - Constant current power converter used for LED illumination - Google Patents
Constant current power converter used for LED illumination Download PDFInfo
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- CN203537599U CN203537599U CN201320704292.8U CN201320704292U CN203537599U CN 203537599 U CN203537599 U CN 203537599U CN 201320704292 U CN201320704292 U CN 201320704292U CN 203537599 U CN203537599 U CN 203537599U
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- led illumination
- constant current
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- current source
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Abstract
The utility model discloses a constant current power converter used for the LED illumination, which can supply a stable current. The constant current power converter used for the LED illumination is characterized by comprising a one-chip microcomputer connected with a digital-to-analogue conversion (DAC) circuit, a key input circuit and an LCD circuit, wherein the DAC circuit is connected with a load via a voltage controlled constant current circuit, the voltage controlled constant current circuit is connected with the one-chip microcomputer via a current sampling amplification circuit and is also connected with a front end adjusting circuit via a three-end integrated regulator, and an auxiliary power supply circuit is connected with the key input circuit, the one-chip microcomputer and the LCD circuit. The constant current power converter used for the LED illumination of the utility model converts a mains power into the current of the constant requirement, can be preset the 10 mA stepping current, can be used for the LED floodlights of different current requirements, and is good in flexibility and stable in performance.
Description
Technical field
The utility model relates to a kind of illuminalive power-supply device, specifically relates to a kind of LED illumination electric supply installation, particularly relates to a kind of LED illumination constant current source converter.
Background technology
In whole 20th century, the incandescent lamp of Edison invented has withstood the test of time, become standard general illumination instrument.But new lighting technology---especially light-emitting diode will finally replace incandescent lamp and fluorescent lamp.LED illumination in recent years development is very fast, uses LED more and more to become possibility in high-power illumination market, though be not also ripe especially, is at least one of popular topic of being extensively concerned about, and illumination is following to be replaced indubitable by LED light source.Affected by World Economics, all finding following new growth engines, investment can get more and more to the fund of LED aspect, and the process of accelerating LED is inevitable.LED, due to environmental protection, the many merits such as the life-span is long, photoelectric efficiency is high, is able to fast development in all trades and professions in recent years.The driving power of LED has also just become the hot issue of paying close attention in the industry naturally.
The scientific principle title of LED is formal light-emitting diode, is a kind of semiconductor solid luminescence device, and solid semiconductor chip is as luminescent material, see through epoxy encapsulation, in semiconductor, by charge carrier, occur compoundly, emit superfluous energy and cause photon reflection, there is not the easily shortcoming such as burning, heat deposition, light decay of filament light-emitting, directly send red, Huang, green, indigo plant, green grass or young crops, orange, purple, the light of white.LED illuminating product utilizes LED as the produced illuminations of light source exactly.LED be called as the 4th generation lighting source or green light source, there is the features such as energy-saving and environmental protection, the life-span is long, volume is little, can be widely used in the fields such as various indications, demonstration, decoration, backlight, general lighting and urban landscape.In recent years, some economically developed countries of the world have launched fierce technology contest around the development of LED.
In the industry cycle someone claims that LED light source is long-life lamp, means the lamp never extinguishing.Because LED volume is little, response is fast, and the life-span is long, and LED light fixture has anti-vibration resistance good and little, can improve the utilance of the automobile confined space, and especially, on power saving, LED becomes the only choosing of headlamp new light sources.Oil price rapidly goes up at present, and when we use common bulb on headlamp, each required power is 55-60 watts, and after using LED, may need only 3-5 watts, the consumption of so just having saved many energy.And the changeable of LED light fitting shape even can cause the change of vehicle configuration not only for the design of headlamp provides larger design space and the degree of freedom, namely may have more streamlined, more novel fashion.Burning hot LED subject under discussion becomes focus throughout the world, and in future, incandescent lamp is bound to be replaced to fall by LED.
The useful life of LED is more than 100,000 hours in theory, but in actual application, because design and the type of drive selection thereof of driving power are improper, LED is very easily damaged, increasingly extensive along with LED application, LED driving power in use, will more and more consider that can it be applicable to the performance requirement of LED.
Op07 chip is a kind of low noise, the bipolarity of non-chopper-zero-stabilized (dual power supply) operational amplifier integrated circuit.Because OP07 has low-down input offset voltage (being 25 μ V to the maximum for OP07A), so OP07 does not need extra zeroing measure in a lot of application scenarios.OP07 has the feature of input bias current low (OP07A is ± 2nA) and open-loop gain high (being 300V/mV for OP07A) simultaneously, and the characteristic of this low imbalance, high open-loop gain makes OP07 be specially adapted to the aspects such as small-signal of measuring equipment and the amplification sensor of high-gain.
Lm7812 refers to three sections of integrated regulator IC chip components and parts, is applicable to various power supply stabilization circuits, and output stability is good, easy to use, output overcurrent, overheated automatic protection.Circuit of three-terminal voltage-stabilizing integrated, as its name suggests, three end IC refer to the integrated circuit that this voltage stabilizing is used, and only have three pin outputs, are respectively input, earth terminal and output.Its appearance likes common triode, and the standard packaging of TO-220 also has the TO-92 encapsulation of lm9013 appearance.In electronic product, common circuit of three-terminal voltage-stabilizing integrated has the lm78 * * series of positive voltage output and the lm79 * * series of negative voltage output.With lm78/lm79 series three-terminal voltage-stabilizing IC, form the required peripheral cell of stabilized voltage power supply few, inside circuit also has overcurrent, overheated and adjust the protective circuit of pipe, and it is reliable, convenient to use, and low price.Lm78 in this series integrated voltage-stabilized IC model or the output voltage of this three ends integrated stable voltage circuit of lm79 digitized representation below, be positive 6V as lm7806 represents output voltage, and lm7909 represents that output voltage is negative 9V.Lm7812 is the integrated regulator of the fixing positive 12V input of three ends.Because three ends are integrated stable voltage circuit easy to use fixedly, in electronic production, often adopt.
Summary of the invention
The purpose of this utility model is to provide a kind of LED illumination constant current source converter that stabling current can be provided.
The utility model is to adopt following technical scheme to realize its goal of the invention, a kind of LED illumination constant current source converter, it comprises single-chip microcomputer, single-chip microcomputer is connected with DAC change-over circuit, button inputting circuits, LCD display circuit, DAC change-over circuit connects load through current voltage-controlled constant-current circuit, and current voltage-controlled constant-current circuit is connected with single-chip microcomputer through current sample amplifying circuit; Current voltage-controlled constant-current circuit is connected with preposition Circuit tuning through circuit of three-terminal voltage-stabilizing integrated again; Auxiliary power circuit is connected with button inputting circuits, single-chip microcomputer, LCD display circuit.
The expansion stream pipe that controlled constant-current source circuit described in the utility model comprises operational amplifier, is connected with operational amplifier, operational amplifier forms linear constant current circuit with expansion stream pipe, and its electric current output area is 0～2000mA; Expand the external circuit of three-terminal voltage-stabilizing integrated of stream pipe.
The push-pull circuit that expansion stream pipe described in the utility model is Darlington transistor TP122 and TIP127 formation, two manage conducting in turn; Described operational amplifier adopts OP07 chip.
Preposition Circuit tuning described in the utility model comprises transformer, full-bridge circuit, filter capacitor, and civil power is connected with circuit of three-terminal voltage-stabilizing integrated through transformer, full-bridge circuit, filter capacitor.
Single-chip microcomputer described in the utility model adopts ATmega128, has 64 pins, 53 programmable I/O mouth lines, 6 kinds of sleep patterns: the Standby pattern of idle pulley, ADC noise suppressed pattern, battery saving mode, power-down mode, Standby pattern and expansion.
Circuit of three-terminal voltage-stabilizing integrated described in the utility model adopts LM7812, to drive Darlington transistor TIP127.
LCD display circuit described in the utility model adopts LCD12864 LCDs, dot matrix display setting current value, measured current value.
Current sample amplifying circuit described in the utility model is measured the output current of constant-current source by measuring the both end voltage of health copper-manganese resistance wire, by it, the mode with level is input to the built-in DC input converter of ATmega128 single-chip microcomputer simultaneously.
Health copper-manganese resistance wire is the sample resistance that is in daily use in current measurement, and its feature is that temperature drift amount is very little.Through test, on the health copper-manganese resistance wire of 1 Ω, by about 2A electric current, the intensification because the heat producing causes, only can cause the change in resistance of 0.02 Ω left and right, electric current stable has been play a part very important.On the other hand, the approximately long 1m of health copper-manganese resistance wire of 1 Ω, due to large with extraneous contact area, even if the heat radiation that logical super-high-current also can be very fast further reduces the impact that temperature drift brings.
Owing to adopting technique scheme, the utility model has been realized goal of the invention preferably, and it converts civil power in the electric current of constant requirement, can preset current, and 10mA stepping, can be used for the LED illuminating lamp of different current requirements, and flexibility is good, stable performance.
Accompanying drawing explanation
Fig. 1 is structural principle schematic block diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, a kind of LED illumination constant current source converter, it comprises single-chip microcomputer, single-chip microcomputer is connected with DAC change-over circuit, button inputting circuits, LCD display circuit, DAC change-over circuit connects load through current voltage-controlled constant-current circuit, and current voltage-controlled constant-current circuit is connected with single-chip microcomputer through current sample amplifying circuit; Current voltage-controlled constant-current circuit is connected with preposition Circuit tuning through circuit of three-terminal voltage-stabilizing integrated again; Auxiliary power circuit is connected with button inputting circuits, single-chip microcomputer, LCD display circuit.
The expansion stream pipe that controlled constant-current source circuit described in the utility model comprises operational amplifier, is connected with operational amplifier, operational amplifier forms linear constant current circuit with expansion stream pipe, and its electric current output area is 0～2000mA; Expand the external circuit of three-terminal voltage-stabilizing integrated of stream pipe.
The push-pull circuit that expansion stream pipe described in the utility model is Darlington transistor TP122 and TIP127 formation, two manage conducting in turn; Described operational amplifier adopts OP07 chip.
Preposition Circuit tuning described in the utility model comprises transformer, full-bridge circuit, filter capacitor, and civil power is connected with circuit of three-terminal voltage-stabilizing integrated through transformer, full-bridge circuit, filter capacitor.
Single-chip microcomputer described in the utility model adopts ATmega128, has 64 pins, 53 programmable I/O mouth lines, 6 kinds of sleep patterns: the Standby pattern of idle pulley, ADC noise suppressed pattern, battery saving mode, power-down mode, Standby pattern and expansion.
Circuit of three-terminal voltage-stabilizing integrated described in the utility model adopts LM7812, to drive Darlington transistor TIP127.
LCD display circuit described in the utility model adopts LCD12864 LCDs, dot matrix display setting current value, measured current value.
Current sample amplifying circuit described in the utility model is measured the output current of constant-current source by measuring the both end voltage of health copper-manganese resistance wire, by it, the mode with level is input to the built-in DC input converter of ATmega128 single-chip microcomputer simultaneously.
Health copper-manganese resistance wire is the sample resistance that is in daily use in current measurement, and its feature is that temperature drift amount is very little.Through test, on the health copper-manganese resistance wire of 1 Ω, by about 2A electric current, the intensification because the heat producing causes, only can cause the change in resistance of 0.02 Ω left and right, electric current stable has been play a part very important.On the other hand, the approximately long 1m of health copper-manganese resistance wire of 1 Ω, due to large with extraneous contact area, even if the heat radiation that logical super-high-current also can be very fast further reduces the impact that temperature drift brings.
During the utility model work, auxiliary power circuit to connected DAC change-over circuit, button inputting circuits, single-chip microcomputer, LCD display circuit to power to provide groundwork voltage; The digital signal of single-chip microcomputer is carried out digital-to-analogue conversion through DAC change-over circuit, regulates and produces 0～1V voltage, and linear correspondence becomes the electric current of 0～2A respectively, to control controlled constant-current source circuit; Civil power is after transformer changes low-voltage (the present embodiment is that the civil power transformation of 220V is become to 20V) into, after full-bridge circuit rectification, by filter capacitor (the present embodiment filter capacitor is 2), carry out filtering, after circuit of three-terminal voltage-stabilizing integrated voltage stabilizing, send into again the operational amplifier in controlled constant-current source circuit, then by the expansion stream pipe in controlled constant-current source circuit, the small electric stream of operational amplifier output is expanded after stream increase, export to load; Meanwhile, current sample amplifying circuit is by measuring the output current of voltage controlled current source (measuring the both end voltage of health copper-manganese resistance wire), and the mode with level is input to the built-in ADC input converter of ATmega128 single-chip microcomputer by it; Single-chip microcomputer is converted to digital signal after the level value of acquisition is processed, and sends in LCD display circuit, to control LCD12864 LCDs and show, is the actual current output valve of voltage controlled current source; Now, can, according to real actual current output valve, by button inputting circuits, adjustment be set.
Claims (9)
1. a LED illumination constant current source converter, it is characterized in that it comprises single-chip microcomputer, single-chip microcomputer is connected with DAC change-over circuit, button inputting circuits, LCD display circuit, DAC change-over circuit connects load through current voltage-controlled constant-current circuit, and current voltage-controlled constant-current circuit is connected with single-chip microcomputer through current sample amplifying circuit; Current voltage-controlled constant-current circuit is connected with preposition Circuit tuning through circuit of three-terminal voltage-stabilizing integrated again; Auxiliary power circuit is connected with button inputting circuits, single-chip microcomputer, LCD display circuit.
2. LED illumination constant current source converter according to claim 1, is characterized in that the expansion stream pipe that described controlled constant-current source circuit comprises operational amplifier, is connected with operational amplifier.
3. LED illumination constant current source converter according to claim 2, is characterized in that the push-pull circuit that described expansion stream pipe is Darlington transistor TP122 and TIP127 formation; Described operational amplifier adopts OP07 chip.
4. LED illumination constant current source converter according to claim 3, is characterized in that described preposition Circuit tuning comprises transformer, full-bridge circuit, filter capacitor.
5. LED illumination constant current source converter according to claim 3, is characterized in that described single-chip microcomputer adopts ATmega128.
6. LED illumination constant current source converter according to claim 4, is characterized in that described single-chip microcomputer adopts ATmega128.
7. according to the LED illumination constant current source converter described in claim 1 or 2 or 3 or 4 or 5 or 6, it is characterized in that described circuit of three-terminal voltage-stabilizing integrated adopts lm7812.
8. according to the LED illumination constant current source converter described in claim 1 or 2 or 3 or 4 or 5 or 6, it is characterized in that described LCD display circuit adopts LCD12864 LCDs.
9. LED illumination constant current source converter according to claim 7, is characterized in that described LCD display circuit adopts LCD12864 LCDs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704292.8U CN203537599U (en) | 2013-11-08 | 2013-11-08 | Constant current power converter used for LED illumination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704292.8U CN203537599U (en) | 2013-11-08 | 2013-11-08 | Constant current power converter used for LED illumination |
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| Publication Number | Publication Date |
|---|---|
| CN203537599U true CN203537599U (en) | 2014-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320704292.8U Expired - Fee Related CN203537599U (en) | 2013-11-08 | 2013-11-08 | Constant current power converter used for LED illumination |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066289A (en) * | 2018-08-21 | 2018-12-21 | 江苏优为视界科技有限公司 | A kind of high brightness flash generator based on semiconductor laser |
-
2013
- 2013-11-08 CN CN201320704292.8U patent/CN203537599U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066289A (en) * | 2018-08-21 | 2018-12-21 | 江苏优为视界科技有限公司 | A kind of high brightness flash generator based on semiconductor laser |
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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: 20140409 Termination date: 20141108 |
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| EXPY | Termination of patent right or utility model |