CN203399357U - Large-power LED adaptive constant current source driver - Google Patents
Large-power LED adaptive constant current source driver Download PDFInfo
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- CN203399357U CN203399357U CN201320416199.7U CN201320416199U CN203399357U CN 203399357 U CN203399357 U CN 203399357U CN 201320416199 U CN201320416199 U CN 201320416199U CN 203399357 U CN203399357 U CN 203399357U
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- constant current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
A large-power LED adaptive constant current source driver comprises a constant current driver, a power supply system, a microcontroller, an eight-channel digit analog switch, an LED lamp set and twelve-bit DAC, wherein the constant current driver comprises an integrated operation amplifier and a power supply chip, the microcontroller employs a sixteen-bit single-chip microcomputer MSP430F2274 which has SPI, a ten-bit ADC, an internal amplifier OAO and 0A1, the eight-channel digit analog switch controls the connection between an output AIN and an input A0-A7 through SELO-SEL3, enters in the single-chip microcomputer MSP430F2274 through AIN input, and outputs specific analog value AOUT through a DAC converter DAC 7611, the constant current driver is connected with the power supply system, and the microcontroller is connected with the power supply system. The large-power LED adaptive constant current source driver can monitor the work state of the LED lamp set on a real time basis and automatically adjust the driving current of the constant current source according to the work state of the LED lamp. The large-power LED adaptive constant current source driver is applicable to LED loads various in power, and prevents overloaded operation of other LED lamp sets and shortening of the service lifetime due to damage of one set of LED lamps.
Description
Technical field
The utility model belongs to LED illumination driver field, is specially great power LED self-adaption constant current source drive.
Background technology
LED illumination has feature energy-conservation, reliability and durability, long service life, has at present progressively replaced traditional lighting system, enter people work, live in the middle of.Yet because the single led power in market is generally all below 10W, therefore often adopt the cascade of a plurality of LED lamp, mode in parallel to improve the lighting power of LED lamp.
Due to the intrinsic V-I characteristic of LED lamp itself, the minor variations of operating voltage is the variation that causes that electric current is larger, thereby causes the variation that brightness is larger, and exceeding rated power will shorten the useful life of LED lamp greatly, so great power LED must drive with constant current.Many is Linear CCS driver and switching regulaor in the market, and Linear CCS driver regulates the pressure drop of current-limiting resistance to make to keep constant by the electric current of LED by pliotron or MOSFFET.Switching regulaor also claims DC-DC power conversion circuit, and it is, by switching device, input direct voltage is carried out to high frequency chopping, and the high-frequency impulse of gained is transformed to certain level value, then reverts to required direct current output valve through rectifying and wave-filtering.
The DC-DC power conversion circuit that common great power LED drive integrated circult transmits based on inductive energy mostly, these circuit all can be by the drive current that carrys out regulating system of extraneous PWM or analog signal.Yet cannot effectively protect whole lamp group; once certain or a plurality of LED are because of quality problems own or damage; now constant-current source output current is constant; the power of abnormal lamp group will be added in other normal lamp group; the normal lamp group leader time works overloadingly can accelerate the aging of itself, and subtract useful life greatly, and lamp group is successively damaged and can be aggravated to remain again the load of lamp group; form vicious circle, aging, the inefficacy rapidly of LED lamp group.
Utility model content
The technical problem that the utility model solves is to provide a kind of great power LED self-adaption constant current source drive, to solve the problem proposing in above-mentioned background technology.
The technical problem that the utility model solves realizes by the following technical solutions:
Great power LED self-adaption constant current source drive, comprises constant-flow driver, power-supply system, micro controller, eight passage digital simulation switches, LED lamp group, 12 DAC; Described constant-flow driver comprises integrated transporting discharging and power supply chip; Described micro controller adopts 16-bit single-chip processor MSP430F2274, and MSP430F2274 has SPI, ten ADC, an internal amplifier OAO, OA1; Described eight passage digital simulation switches, control output AIN by SELO-SEL3 and are connected with input AO-A7, by AIN, are inputted and are entered single-chip microcomputer MSP430F2274, and by DAC transducer, DAC7611 exports specific analogue value AOUT; Described constant-flow driver is connected with power-supply system; Described micro controller is connected with power-supply system.
Further, described power supply chip is a fixed-frequency PWM buck DC-DC transducer, and output voltage values is determined by voltage stabilizing didoe.
Further, described 12 DAC select DAC7611, and are connected with micro controller by SPI interface.
Further, described micro controller passes through to control SELO, SEL1, and SEL2 selects certain group LED lamp, carries out analog/digital conversion, gathers LED lamp operating state.
The utility model operation principle: constant-current source driver is comprised of integrated transporting discharging LM358 and power supply chip XL4016, XL4016 is the fixed-frequency PWM buck DC-DC transducer of a 180kHz, 8A current loading, 36VDC input, output voltage values is defined as 30V by voltage stabilizing didoe D2, and this has just limited the series connection number of LED lamp.Due to the pressure drop of light emitting LED lamp, each is 3.3V, and this just makes output voltage be up to 3.3 * 9=29.7V, the consideration based on redundancy, and system adopts 8 LED series connection outputs, i.e. 3.3 * 8=26.4V.
After system powers on, the DAC7611 output AOUT=1.25V that single-chip microcomputer regulates, thus have
Due to R
cSprecision is not enough, makes to have certain deviation between output current and set point 3A.Generally, regulate R
cSsize, can regulate the electric current of constant-current source.But if LED lamp group is some or a plurality of LED are aging or break down, just need system to detect and automatically regulate the electric current of constant-current source, therefore just need to regulate AOUT.
The about 3.3V of LED pressure drop of 1W, electric current 300mA, therefore has
In like manner can obtain A1～A7 is all 0.2V, and Here it is regulates the foundation of AOUT, once damaging appears in certain LED lamp, whole string LED will quit work, now A
0=I
loadr
cS=O.1V, just requiring this time MCU to regulate AOUT is 1V, just can make I
load=AOUT/R
cS(1+R
5/ R
6)=2.7A, guarantees that remaining lamp brightness preservation is constant.
Beneficial effect
The utility model can be supervised the operating state of controlled LED lamp group in real time, automatically regulates the drive current of constant-current source according to the operating state of LED lamp, adapts to the LED load of different capacity.Prevent from causing other LED lamp group overload operation reduction of service life because certain group LED lamp damages.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the micro controller in the utility model;
Fig. 3 is the DAC transducer in the utility model;
Fig. 4 is the utility model eight tunnels analogy switches;
Fig. 5 is the utility model constant current source driving circuit figure;
Fig. 6 is the utility model LED lamp group.
Embodiment
In order to make of the present utility modelly to realize technological means, creation characteristic, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
As shown in Figure 1, great power LED self-adaption constant current source drive, comprises constant-flow driver 1, power-supply system 2, micro controller 3, eight passage digital simulation switches 4,5,12 DAC6 of LED lamp group; Described constant-flow driver 1 comprises integrated transporting discharging 7 and power supply chip 8; Described micro controller adopts 16-bit single-chip processor MSP430F2274, and MSP430F2274 has SPI interface 9, ten ADC10, internal amplifier OAO, OA111; Described eight passage digital simulation switches 4, control output AIN by SELO-SEL3 and are connected with input A0-A7, by AIN, are inputted and are entered single-chip microcomputer, and by DAC transducer, DAC7611 exports specific analogue value AOUT; Described constant-flow driver 1 is connected with power-supply system 2; Described micro controller 3 is connected with power-supply system 2.
Further, described power supply chip 8 is a fixed-frequency PWM buck DC-DC transducer, and output voltage values is determined by voltage stabilizing didoe.
Further, described 12 DAC6 select DAC7611, and are connected with micro controller 3 by SPI interface 9.
Further, described micro controller 3 passes through to control SELO, SEL1, and SEL2 selects certain group LED lamp, carries out analog/digital conversion, gathers LED lamp operating state.
The utility model operation principle: constant-current source driver is comprised of integrated transporting discharging 7LM358 and power supply core 8XL4016, XL4016 is the fixed-frequency PWM buck DC-DC transducer of a 180kHz, 8A current loading, 36VDC input, output voltage values is defined as 30V by voltage stabilizing didoe D2, and this has just limited the series connection number of LED lamp.Due to the pressure drop of light emitting LED lamp, each is 3.3V, and this just makes output voltage be up to 3.3 * 9=29.7V, the consideration based on redundancy, and system adopts 8 LED series connection outputs, i.e. 3.3 * 8=26.4V.
After system powers on, the DAC7611 output AOUT=1.25V that single-chip microcomputer regulates, thus have
Due to R
cSprecision is not enough, makes to have certain deviation between output current and set point 3A.Generally, regulate R
cSsize, can regulate the electric current of constant-current source.But if LED lamp group is some or a plurality of LED are aging or break down, just need system to detect and automatically regulate the electric current of constant-current source, therefore just need to regulate AOUT.
The about 3.3V of LED pressure drop of 1W, electric current 300mA, therefore has
In like manner can obtain A1～A7 is all 0.2V, and Here it is regulates the foundation of AOUT, once damaging appears in certain LED lamp, whole string LED will quit work, now A
0=I
loadr
cS=0.1V, just requiring this time MCU to regulate AOUT is 1V, just can make I
load=AOUT/R
cS(1+R
5/ R
6)=2.7A, guarantees that remaining lamp brightness preservation is constant.
More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.Claimed scope of the present utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. great power LED self-adaption constant current source drive, is characterized in that, comprises constant-flow driver, power-supply system, micro controller, eight passage digital simulation switches, LED lamp group, 12 DAC; Described constant-flow driver comprises integrated transporting discharging and power supply chip; Described micro controller adopts 16-bit single-chip processor MSP430F2274, and MSP430F2274 has SPI, ten ADC, an internal amplifier OAO, OA1; Described eight passage digital simulation switches, control output AIN by SELO-SEL3 and are connected with input AO-A7, by AIN, are inputted and are entered single-chip microcomputer MSP430F2274, and by DAC transducer, DAC7611 exports specific analogue value AOUT; Described constant-flow driver is connected with power-supply system; Described micro controller is connected with power-supply system.
2. great power LED self-adaption constant current source drive according to claim 1, is characterized in that, described power supply chip is a fixed-frequency PWM buck DC-DC transducer, and output voltage values is determined by voltage stabilizing didoe.
3. great power LED self-adaption constant current source drive according to claim 1, is characterized in that, described 12 DAC select DAC7611, and is connected with micro controller by SPI interface.
4. great power LED self-adaption constant current source drive according to claim 1, is characterized in that, described micro controller passes through to control SELO, SEL1, and SEL2 selects certain group LED lamp, carries out analog/digital conversion, gathers LED lamp operating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320416199.7U CN203399357U (en) | 2013-07-08 | 2013-07-08 | Large-power LED adaptive constant current source driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320416199.7U CN203399357U (en) | 2013-07-08 | 2013-07-08 | Large-power LED adaptive constant current source driver |
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| Publication Number | Publication Date |
|---|---|
| CN203399357U true CN203399357U (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320416199.7U Expired - Fee Related CN203399357U (en) | 2013-07-08 | 2013-07-08 | Large-power LED adaptive constant current source driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11515882B2 (en) | 2020-12-18 | 2022-11-29 | Analog Devices International Unlimited Company | MCU mode for SPI communication between precision converters and microcontrollers |
-
2013
- 2013-07-08 CN CN201320416199.7U patent/CN203399357U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11515882B2 (en) | 2020-12-18 | 2022-11-29 | Analog Devices International Unlimited Company | MCU mode for SPI communication between precision converters and microcontrollers |
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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: 20140115 Termination date: 20150708 |
|
| EXPY | Termination of patent right or utility model |