CN102186288B - Intelligent LED (Light Emitting Diode) driving chip - Google Patents
Intelligent LED (Light Emitting Diode) driving chip Download PDFInfo
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- CN102186288B CN102186288B CN201110088411.7A CN201110088411A CN102186288B CN 102186288 B CN102186288 B CN 102186288B CN 201110088411 A CN201110088411 A CN 201110088411A CN 102186288 B CN102186288 B CN 102186288B
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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
The invention discloses an intelligent LED (Light Emitting Diode) driving chip which comprises a detection unit, a processing unit, a voltage conversion unit and a driving unit, wherein the detection unit is connected with respective LEDs through respective connecting passageways and is used for automatically detecting actual voltage data of the respective LEDs and feeding the actual voltage data back to the processing unit; the processing unit is used for computing the number of the respective LEDs connected in series with the respective connecting passageways and the amplitude of voltage needed to be adjusted according to the actual voltage data, generating adjusted output voltage data of the respective connecting passageways, and sending the adjusted output voltage data to the voltage conversion unit; and the voltage conversion unit is arranged to input signal data including voltage information, convert a voltage of the signal data input by a data input port according to the adjusted output voltage data, and send the voltage-converted signal data to the driving unit to drive the respective LEDs. In the invention, an output voltage of the intelligent LED driving chip can be adjusted automatically according to the number and the connection means of driven LEDs so as to be consistent with driving voltages of the respective LEDs.
Description
Technical field
The present invention relates to the Driving technique of lighting device, particularly relate to a kind of intelligent LED driving chip.
Background technology
In the stage now, pursue healthy in the whole world, environmental protection pressure, in the great situation of energy crisis, semiconductor lighting by universally acknowledged be a kind of important channel of health energy-saving environment protective, expand its range of application just at faster speed.
In prior art, LED drive chip is all adopt constant current driving or constant voltage to drive to arrange, and the output voltage of LED drive chip or output current are constant output, but each series LED quantity driven due to LED drive chip is not identical, and, when connecting multiple LED, there is circuit loss in series circuit, easily makes series connection LED electrical below press through low, can not light, if series voltage is less, but driving voltage is excessive, then easily make LED burn out.
Therefore, prior art existing defects, needs to improve.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of and can automatically adjust its output voltage according to the connected mode of the quantity of driving LED and each LED, make the intelligent LED driving chip that its output voltage is consistent with the driving voltage of each LED of driving.
Technical scheme of the present invention is as follows: a kind of intelligent LED driving chip, wherein, comprises detecting unit, processing unit, voltage conversion unit and driver element; Described detecting unit is connected with each LED by least one interface channel, for automatically detecting the virtual voltage data of each LED in each interface channel, and feeds back to described processing unit; Described processing unit, according to described virtual voltage data, calculates the quantity of each LED and the amplitude of required adjustment voltage of each interface channel series connection, generates the adjustment output voltage data of each interface channel, and be sent to described voltage conversion unit; Described voltage conversion unit arranges at least one data-in port, for input signal data, wherein comprises information of voltage; Described voltage conversion unit, according to described adjustment output voltage data, changes the voltage of the signal data that described data-in port inputs, and the described signal data after changing voltage is sent to described driver element; Described driver element drives each LED by each interface channel.
Be applied to technique scheme, in described intelligent LED driving chip, also comprise one and pre-set unit, be connected with described processing unit, for pre-seting the minimum voltage of each LED.
Be applied to each technical scheme above-mentioned, in described intelligent LED driving chip, described detecting unit is connected by each LED of at least one catenation sequence at least one interface channel and outside, for automatically detecting the virtual voltage data of each LED in each catenation sequence according to the order of connection, and feed back to described processing unit.
Be applied to each technical scheme above-mentioned, in described intelligent LED driving chip, described interface channel comprises red LED interface channel, green LED interface channel and blue led interface channel, connects with corresponding assorted LED respectively by connection line.
Be applied to each technical scheme above-mentioned, in described intelligent LED driving chip, described voltage conversion unit comprises step-down conversion subelement, a boost conversion subelement and a switch subelement, for according to described adjustment output voltage data, start described step-down conversion subelement or described boost conversion subelement.
Be applied to each technical scheme above-mentioned, in described intelligent LED driving chip, described processing unit also arranges a fault and exports subelement and a judgment sub-unit; Described judgment sub-unit is used for when described virtual voltage data exceed preset limit value, starts described fault and exports subelement, and the error message transmitting described virtual voltage data exports subelement to described fault; Described fault exports subelement for the error message according to described virtual voltage data, generates fault data and also exports.
Be applied to each technical scheme above-mentioned, in described intelligent LED driving chip, described processing unit also arranges a feedback output end mouth, for the described virtual voltage data of each LED in each interface channel of output display.
Be applied to each technical scheme above-mentioned, in described intelligent LED driving chip, memory cell and PWM control unit are also set; Described memory cell is for storing described preset limit value, described adjustment output voltage data, described signal data; Described PWM control unit generates pwm signal according to the described signal data after changing voltage, drives each LED by described driver element by each interface channel.
Be applied to each technical scheme above-mentioned, in described intelligent LED driving chip, cascade codec unit is also set, an intelligent LED driving chip and next intelligent LED driving chip in cascade, intercept the described input signal data that it needs, remaining input signal data is sent to next intelligent LED driving chip.
Be applied to each technical scheme above-mentioned, in described intelligent LED driving chip, described intelligent LED driving chip is redundancy fault-tolerant driving chip, and it comprises at least two data-in ports, and each data-in port each other redundancy is arranged.
Adopt such scheme, the present invention detects the virtual voltage data of each LED in each interface channel automatically by arranging described detecting unit, and feeds back to described processing unit; By described processing unit according to described virtual voltage data, calculate the quantity of each LED and the amplitude of required adjustment voltage of each interface channel series connection, generate the adjustment output voltage data of each interface channel, and be sent to described voltage conversion unit; Again by described voltage conversion unit according to described adjustment output voltage data, change the voltage of the signal data that described data-in port inputs; And by arrange driver element and the described signal data after changing voltage is driven each LED; Make the LED quantity that its output voltage can be connected with each interface channel, and the driving voltage required for position of its series connection conforms to, thus each LED is normally worked under its minimum drive voltage, electric energy damages minimum, further, can show according to pre-seting brightness.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of the specific embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, present embodiments provide a kind of intelligent LED driving chip, the quantity of the assorted LED that described intelligent LED driving chip can drive according to it, automatically its output voltage is adjusted, to guarantee that its assorted LED driven can light under normal minimum voltage, thus carry out work according to predetermined luminance.
Wherein, described intelligent LED driving chip comprises interconnective detecting unit, processing unit, voltage conversion unit and driver element.
Described detecting unit is connected with each LED by one or more interface channels, namely be connected with each LED by the driver circuit of one or more, and, the each LED be connected with every a connection channel is connected in series respectively, described detecting unit may be used for the virtual voltage data automatically detecting each LED in each interface channel, and the described virtual voltage data feedback detected is to described processing unit; Described detecting unit has the function detected in real time, may be used for the virtual voltage data of each LED in each interface channel of real time automatic detection, and the described virtual voltage data Real-time Feedback detected is to described processing unit.
Such as, described interface channel can comprise red LED interface channel, green LED interface channel and blue led interface channel, wherein, described red LED interface channel is connected with one or more red LED, described green LED interface channel is connected with one or more green LED, and described blue led interface channel is connected with one or more blue led; Described detecting unit is used for detecting respectively the virtual voltage data of the virtual voltage data of each red LED of red LED interface channel, the virtual voltage data of each green LED of green LED interface channel and each blue led of blue led interface channel, and feeds back to described processing unit respectively.
And for example, described detecting unit is connected by each LED of the one or more catenation sequence in one or more interface channels and outside, for automatically detecting the virtual voltage data of each LED in each catenation sequence according to the order of connection, as, according to the series sequence of each LED, or, the order of each LED of each interface channel parallel connection, detect the virtual voltage data of each LED respectively, and feed back to described processing unit.Detecting unit is connected to an outside catenation sequence by a pin of described intelligent LED driving chip, a catenation sequence can be the homochromy or heterochromatic LED of several parallel connections, or the homochromy or heterochromatic LED of several series connection, or the homochromy or heterochromatic LED that several parallel connection and serial connections are combined.Such as, detecting unit can be connected respectively to several catenation sequences by several pins of described intelligent LED driving chip.
Described processing unit receives each described virtual voltage data of feedback, and according to described virtual voltage data, calculate the quantity of each LED and the amplitude of required adjustment voltage of the series connection of each interface channel, wherein, can according to total output voltage of each interface channel, and the virtual voltage of each LED, calculate the quantity of each LED of each interface channel series connection, and according to the standard operating voltage of each LED and its virtual voltage, calculate the amplitude of each LED required adjustment voltage of each interface channel series connection, and generate the adjustment output voltage data of each interface channel, and adjustment output voltage data are sent to described voltage conversion unit.
Wherein, described voltage conversion unit is connected with described processing unit, further, described voltage conversion unit also arranges one or more data-in ports, and each described data-in port is connected with outside control device, described signal data is inputted by the control device of outside, wherein, described signal data is the signal data driving each LED in each interface channel, and, described signal data comprises information of voltage, i.e. the input voltage information of described LED drive chip.
And, described voltage conversion unit receives each described adjustment output voltage data from described processing unit, and according to described adjustment output voltage data, change the voltage of the signal data that each described data-in port inputs, wherein, when the voltage inputted is lower relative to the driving voltage of each LED, low pressure can be converted to High voltage output, or, when the voltage inputted is higher relative to the driving voltage of each LED, then high pressure can be converted to low pressure to export, the voltage transitions of described signal data is consistent needed for the normal working voltage of each LED with each passage driven, and, described signal data after changing voltage is sent to described driver element.
Such as, described voltage conversion unit can comprise step-down conversion subelement, a boost conversion subelement and a switch subelement, described switch subelement may be used for starting described step-down conversion subelement and/or described boost conversion subelement, when normal working voltage higher than each LED of the voltage of described signal data, then described switch subelement is according to described adjustment output voltage data, start described step-down conversion subelement, meet the low voltage drive of each interface channel at a small amount of LED of series connection; Or, when normal working voltage lower than each LED of the voltage of described signal data, then described switch subelement is according to described adjustment output voltage data, start described boost conversion subelement, thus can according to the actual needs of each LED driven by the voltage of described signal data, be converted to high pressure or low pressure, meet the high voltage drive of each interface channel at the more LED of series connection, thus make the quantity of its LED that can connect according to each interface channel driven, normally light each LED of each interface channel, each LED can normally be worked.
After described driver element receives changing voltage, the described signal data namely after boosting or step-down, and by each interface channel, adopt described signal data to drive each LED, makes each LED light and according to pre-seting display video image.
Or, described intelligent LED driving chip can also comprise one and pre-set unit, the described unit that pre-sets is connected with described processing unit, the minimum voltage that unit pre-sets each LED is pre-seted by described, namely the minimum of each LED lights power supply, each LED quantity of connecting due to every a connection channel is different, and, due to when connecting multiple LED, can voltage loss be there is in series circuit, therefore, can by described pre-set unit to arrange be in different interface channel, the minimum voltage of the LED of different series connection or juxtaposed position, thus changed by voltage conversion unit, make described driver element when driving each interface channel, the minimum voltage of each LED can be reached, thus each LED can be lighted by minimally, each LED is normally worked under the state of minimum voltage, can consume and reach minimum.
Or an example is, described processing unit also arranges a fault and exports subelement and a judgment sub-unit, after described detecting unit detects the described virtual voltage data of each LED, described judgment sub-unit is also for judging whether described virtual voltage data exceed default limiting value, namely minimum voltage limiting value or ceiling voltage limiting value that described LED bears is exceeded, when exceeding described limiting value in described virtual voltage data, then start described fault and export subelement, and the error message transmitting described virtual voltage data exports subelement to described fault, wherein, described limiting value can be arranged according to the minimum voltage born of each LED or ceiling voltage, when being no more than this limiting value, each LED normally can light work, when exceeding this limiting value, it is excessive to there is voltage in each LED, open circuit, burn out, spread of voltage shows, or there is faults such as loosening in circuit, then described fault exports subelement according to the error message of described virtual voltage data, generates fault data and exports, wherein, outside PC can be exported to show, or, export outside indicating member to and indicate, or, export outside prewarning unit to and carry out early warning etc.
Or, an example is, described processing unit also arranges a feedback output end mouth, described processing unit can be connected with outside display unit by the described feedback output end mouth arranged, and the described virtual voltage data of each LED in each interface channel are exported by described feedback output end mouth, thus the described virtual voltage data of each LED can be shown by outside display unit, make the described virtual voltage data can watching each LED at any time, thus know the real-time display voltage condition of each LED.
Or another example is, described intelligent LED driving chip also arranges memory cell and PWM control unit, wherein, described memory cell is for storing described limiting value, described adjustment output voltage data, described signal data, described memory cell plays the effect of buffer memory to each data, make to transfer various data from described memory cell at any time in actual use, conveniently check or use its history or each described limiting value that using, each described adjustment output voltage data and each described signal data and, described PWM control unit generates pwm signal according to the described signal data after changing voltage, described driver element is then according to described pwm signal, and drive each LED by each interface channel, make the display effect of each LED when showing each video image better.
Or, described intelligent LED driving chip also arranges cascade codec unit, described cascade codec unit is an intelligent LED driving chip and next intelligent LED driving chip signal data in cascade, described signal data is in the process of transmission, described cascade codec unit can intercept its described input signal data needed, and remaining input signal data is sent to next intelligent LED driving chip, to make multiple described intelligent LED driving chip can cascade mutually, to drive more LED, to form various LED display display video image.
Or, described intelligent LED driving chip can also be redundancy fault-tolerant driving chip, namely described intelligence is also provided with functions of redundancy and fault tolerance module, and, it comprises two or more data-in port, each data-in port each other redundancy is arranged, namely two or more data-in port inputs the described signal data of identical redundancy each other respectively, it is by the correct trouble-free described signal data of described functions of redundancy and fault tolerance model choice of setting, drive outside each LED, the described signal data of described intelligent LED driving chip is made to have multiple guarantee, use the driving of described signal data reliable and stable.
It should be noted that, the mutual combination of above-mentioned each technical characteristic, forms each embodiment, should be considered as the scope that specification of the present invention is recorded.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (6)
1. an intelligent LED driving chip, is characterized in that, comprises detecting unit, processing unit, voltage conversion unit and driver element;
Described detecting unit has the function detected in real time, described detecting unit is connected with each LED by least one interface channel, for the virtual voltage data of each LED in each interface channel of real time automatic detection, and the described virtual voltage data Real-time Feedback detected is to described processing unit;
Described processing unit, according to described virtual voltage data, calculates the quantity of each LED and the amplitude of required adjustment voltage of each interface channel series connection, generates the adjustment output voltage data of each interface channel, and be sent to described voltage conversion unit;
Described voltage conversion unit arranges at least one data-in port, for input signal data, wherein comprises information of voltage;
Described voltage conversion unit, according to described adjustment output voltage data, changes the voltage of the signal data that described data-in port inputs, and the described signal data after changing voltage is sent to described driver element;
Described driver element drives each LED by each interface channel;
Processing unit also arranges a fault and exports subelement and a judgment sub-unit; Described judgment sub-unit is used for when described virtual voltage data exceed preset limit value, starts described fault and exports subelement, and the error message transmitting described virtual voltage data exports subelement to described fault; Described fault exports subelement for the error message according to described virtual voltage data, generates fault data and also exports; Described processing unit also arranges a feedback output end mouth, for the described virtual voltage data of each LED in each interface channel of output display;
Cascade codec unit is also set, an intelligent LED driving chip and next intelligent LED driving chip in cascade, intercepts the described input signal data that it needs, remaining input signal data is sent to next intelligent LED driving chip;
Described intelligent LED driving chip is redundancy fault-tolerant driving chip, it comprises at least two data-in ports, each data-in port each other redundancy is arranged, described at least two data-in ports input the described signal data of identical redundancy each other respectively, and it selects correct trouble-free described signal data by the described redundancy fault-tolerant driving chip arranged.
2. intelligent LED driving chip according to claim 1, is characterized in that, also comprises one and pre-sets unit, is connected with described processing unit, for pre-seting the minimum voltage of each LED.
3. intelligent LED driving chip according to claim 1, it is characterized in that, described detecting unit is connected by each LED of at least one catenation sequence at least one interface channel and outside, for automatically detecting the virtual voltage data of each LED in each catenation sequence according to the order of connection, and feed back to described processing unit.
4. intelligent LED driving chip according to claim 1, is characterized in that, described interface channel comprises red LED interface channel, green LED interface channel and blue led interface channel, connects with corresponding assorted LED respectively by connection line.
5. according to the arbitrary described intelligent LED driving chip of Claims 1-4, it is characterized in that, described voltage conversion unit comprises step-down conversion subelement, a boost conversion subelement and a switch subelement, for according to described adjustment output voltage data, start described step-down conversion subelement or described boost conversion subelement.
6. intelligent LED driving chip according to claim 1, is characterized in that, also arranges memory cell and PWM control unit; Described memory cell is for storing described preset limit value, described adjustment output voltage data, described signal data; Described PWM control unit generates pwm signal according to the described signal data after changing voltage, drives each LED by described driver element by each interface channel.
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| CN201110088411.7A CN102186288B (en) | 2011-04-08 | 2011-04-08 | Intelligent LED (Light Emitting Diode) driving chip |
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| CN201110088411.7A CN102186288B (en) | 2011-04-08 | 2011-04-08 | Intelligent LED (Light Emitting Diode) driving chip |
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| CN102186288B true CN102186288B (en) | 2015-07-08 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103220867B (en) * | 2013-04-28 | 2015-01-07 | 京东方科技集团股份有限公司 | Method and system for driving light emitting diode (LED) lamp |
| CN110572903B (en) * | 2019-08-28 | 2022-06-07 | 中山市明联电子有限公司 | LED power supply with constant current output |
| CN111698815B (en) * | 2020-05-14 | 2021-08-03 | 大茂伟瑞柯车灯有限公司 | Method for realizing LED voltage self-adaption based on voltage boosting and voltage reducing integrated circuit |
| CN112908232B (en) * | 2021-03-26 | 2022-10-18 | 四川长虹电器股份有限公司 | LED multi-partition backlight fault detection system and fault judgment method |
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| CN201766751U (en) * | 2010-08-16 | 2011-03-16 | 英飞特电子（杭州）有限公司 | Open-circuit protection circuit for LED (light-emitting diode) constant-current driving circuit |
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| CN101017646A (en) * | 2006-02-09 | 2007-08-15 | 三星电机株式会社 | Drive device of color LED backlight |
| CN201365198Y (en) * | 2009-01-22 | 2009-12-16 | 皇源电子(深圳)有限公司 | High-efficient series-parallel LED power supply |
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