CN101557668B - Method for controlling illuminative high-power LED - Google Patents
Method for controlling illuminative high-power LED Download PDFInfo
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- CN101557668B CN101557668B CN2009100848880A CN200910084888A CN101557668B CN 101557668 B CN101557668 B CN 101557668B CN 2009100848880 A CN2009100848880 A CN 2009100848880A CN 200910084888 A CN200910084888 A CN 200910084888A CN 101557668 B CN101557668 B CN 101557668B
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Abstract
The invention relates to a method for controlling an illuminative high-power LED, in particular to a method for managing a plurality of single-LEDs in groups. The method comprises the steps of: carrying out current sharing control and leading a group of single-LEDs with current greater than that of other groups of single-LEDs to distribute current to other groups of single-LEDs. The method for controlling the illuminative high-power LED can regulate work current in a unified manner, keep constant state and equal distribution of the work current, and guarantee uniformity between electrical parameter and temperature coefficient of the single-LED so as to effectively enhance stability and service life of the illuminative high-power LED.
Description
Technical field
The present invention relates to a kind of LED control method, particularly relate to a kind of method for controlling illuminative high-power LED.
Background technology
Advantages such as the LED lighting apparatus is little because of its caloric value, little power consumption obtain application more and more widely in recent years.Common in the market illuminative high-power LED integrated circuit all is parameters such as the square array structure that adopts many group parallel connections, the electrical quantity of the inner a plurality of LED monomers of centralized driving control integrated circuit and temperature coefficient.The temperature coefficient of LED is very big; The temperature coefficient of common single LEDs is-2mv/ ℃, that is to say, and the temperature coefficient of the LED set of monomers of one 10 string is-20mv/ ℃; When temperature raises 50 ℃; The conducting voltage of LED set of monomers can reduce 1v, and under the constant condition of supply power voltage, the conducting voltage of LED reduces 1v can make operating current increase about 10 times.Therefore, extremely important for the temperature control and the constant pressure and flow control of great power LED product.Though prior art externally power circuit increases constant current control; But still can not solve the electrical quantity and the not quite identical problem of temperature coefficient of a plurality of monomers of LED IC interior; Thereby the situation of IC interior electric current maldistribution very easily takes place; Thereby cause the individual or part of IC interior to burn out very soon, vicious circle then causes whole permanent the burning of integrated circuit.This situation is very general in practical application, and does not still have solution preferably at present, has restricted the popularization and application of great power LED integrated circuit.
How to found a kind of operating current of unifying to adjust; Keep constant, the distributed uniform of operating current; Guarantee that LED monomer electrical quantity is consistent with temperature coefficient; Thereby effectively improve the stability of illuminative high-power LED equipment and the new method for controlling illuminative high-power LED in useful life, one of real important subject that belongs to current this area also is that the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to; Overcome the defective that existing method for controlling illuminative high-power LED exists, and a kind of method for controlling illuminative high-power LED of new structure is provided, technical problem to be solved is to make it can unify to adjust operating current; Keep constant, the distributed uniform of operating current; Guarantee that LED monomer electrical quantity is consistent with temperature coefficient, thus the stability and the useful life of effectively improving illuminative high-power LED equipment, thus be suitable for practicality more.
The object of the invention and solve its technical problem and adopt following technical scheme to realize.A kind of method for controlling illuminative high-power LED according to the present invention's proposition; It is the method for a plurality of LED monomers being carried out grouping management; May further comprise the steps: sharing control, when the electric current of a LED set of monomers during greater than other LED set of monomers, to other LED monomer component distribution stream.
The object of the invention and solve its technical problem and also can adopt following technical measures further to realize.
Aforesaid method for controlling illuminative high-power LED, described sharing control are to realize through the flow equalizing circuit that resistance or resistance-capacitance network constitute.
Aforesaid method for controlling illuminative high-power LED, before the described sharing control step, further comprising the steps of: step 1, set reference signal; Step 2 is taken a sample, is amplified the circuit parameter of each LED set of monomers, obtains the sampling amplifying signal; Step 3, relatively take a sample amplifying signal and reference signal; Step 4 when the sampling amplifying signal of certain LED set of monomers departs from reference signal, is adjusted the electric current of this LED set of monomers.
Aforesaid method for controlling illuminative high-power LED, the sample circuit sharing control of described step 2 can realize through the flow equalizing circuit that resistance or resistance-capacitance network constitute simultaneously.
Aforesaid method for controlling illuminative high-power LED, described sampling, amplification, comparison and adjustment all realize through linear circuit.
Aforesaid method for controlling illuminative high-power LED, before the described sharing control step, further comprising the steps of: step 1, set basic parameter, produce modulation signal, and with basic parameter and modulation signal stack composite pulse reference signal; Step 2 is taken a sample, is amplified the circuit parameter of each LED set of monomers, obtains the sampling amplifying signal; Step 3, relatively take a sample amplifying signal and pulse reference signal obtain pwm pulse signal; Step 4 when pwm pulse signal shows that the sampling amplifying signal of certain LED set of monomers departs from the pulse reference signal, is adjusted the electric current of this LED set of monomers.
Aforesaid method for controlling illuminative high-power LED, the sample circuit sharing control step of described step 2 can realize through the flow equalizing circuit that resistance or resistance-capacitance network constitute simultaneously.
Aforesaid method for controlling illuminative high-power LED, described step 4 realizes through pulse adjustment circuit; Described step 3, between four, also comprise shaping pulse step to pwm pulse signal.
The present invention compared with prior art has following tangible advantage and beneficial effect at least: method for controlling illuminative high-power LED of the present invention; A plurality of LED monomers are implemented the control of dividing into groups; And be every group of LED configuration current control unit, can keep constant, the uniform distribution of operating current, unified adjustment, the operating current that variations in temperature is caused changes and compensates control; Thereby the inconsistent problems of parameter such as electrical quantity, temperature coefficient between traditional LED integrated circuit set of monomers have been solved; Can guarantee that the illuminative high-power LED equipment performance is reliable and stable, year light decay less than 10%, the life-span is greater than 50000 hours, meets the industry development needs, be suitable for industry and promote the use of.
In sum; Method for controlling illuminative high-power LED of the present invention can unify to adjust operating current, keeps constant, the distributed uniform of operating current; Guarantee that LED monomer electrical quantity is consistent with temperature coefficient, thus the stability and the useful life of effectively improving illuminative high-power LED equipment.The present invention has above-mentioned plurality of advantages and practical value; Bigger improvement is all arranged on control method or function; Obvious improvement is arranged technically, and produced handy and practical effect, and more existing method for controlling illuminative high-power LED has outstanding effect; Thereby be suitable for practicality more, and have industrial utilization widely.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; Understand technological means of the present invention in order can more to know; And can implement according to the content of specification, and for let of the present invention above-mentioned with other purposes, feature and advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is the circuit diagram of method for controlling illuminative high-power LED embodiment two of the present invention.
Fig. 2 is the circuit diagram of method for controlling illuminative high-power LED embodiment three of the present invention.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention; Below in conjunction with accompanying drawing and preferred embodiment; To its embodiment of method for controlling illuminative high-power LED, control method, step, characteristic and the effect thereof that proposes according to the present invention, specify as after.
A kind of method for controlling illuminative high-power LED of the present invention is a control method of a plurality of LED monomers being carried out grouping managements, when comprising that mainly electric current when a LED set of monomers is greater than other LED set of monomers, and the step that flows to other LED monomer component distribution.
Embodiment one
Better simply; The present invention can utilize circuit elements such as resistance, resistance-capacitance network to constitute classical flow equalizing circuit, when the electric current increase of flowing through certain LED set of monomers, during greater than other LED set of monomers; Electric current in this flow equalizing circuit also increases; The voltage at flow equalizing circuit two ends raises, and forces the electric current of this LED set of monomers to distribute to other LED set of monomers, thereby is implemented in the effect of uniform distribution electric current between each LED set of monomers.
Embodiment two
See also shown in Figure 1ly, the present invention also can improve on the basis of embodiment one, realizes through following steps:
Step 1 is set reference signal;
Step 2 is taken a sample, is amplified the circuit parameter of each LED set of monomers, obtains the sampling amplifying signal;
Step 3, relatively take a sample amplifying signal and reference signal;
Step 4 when the sampling amplifying signal of certain LED set of monomers departs from reference signal, is adjusted the electric current of this LED set of monomers.
Step 5 is when the electric current of a LED set of monomers during greater than other LED set of monomers, to other LED monomer component distribution stream.
The sample circuit step 5 of above-mentioned steps two can realize through the flow equalizing circuit that resistance or resistance-capacitance network constitute simultaneously, and this flow equalizing circuit, amplifying circuit, comparison circuit and adjustment circuit all adopt linear circuit to realize.
Present embodiment has better constant current control effect than embodiment one; When the electric current that flows through the LED set of monomers increases; The voltage at its circuit two ends raises, and compares with reference signal after this circuit parameter is amplified, again through the linear up-down of adjusting this LED set of monomers electric current of circuit adjustment.If power supply change in voltage scope is bigger, the fail safe of LED monomer is higher in the present embodiment.
Embodiment three
See also shown in Figure 2ly, the present invention also can realize through following steps:
Step 1 is set basic parameter, produces modulation signal, and with basic parameter and modulation signal stack composite pulse reference signal;
Step 2 is taken a sample, is amplified the circuit parameter of each LED set of monomers, obtains the sampling amplifying signal;
Step 3, relatively take a sample amplifying signal and pulse reference signal obtain pwm pulse signal;
Step 4 when pwm pulse signal shows that the sampling amplifying signal of certain LED set of monomers departs from the pulse reference signal, is adjusted the electric current of this LED set of monomers.
Step 5 is when the electric current of a LED set of monomers during greater than other LED set of monomers, to other LED monomer component distribution stream.
Preferable, the sample circuit step 5 of step 2 can realize through the flow equalizing circuit that resistance or resistance-capacitance network constitute simultaneously; The adjustment circuit adopts the pulse adjustment, and increases the shaping pulse step to pwm pulse signal in step 3, between four.
Present embodiment utilizes modulation signal (triangular wave) generator to produce modulation signal, utilizes the benchmark combiner circuit that basic parameter of setting and modulation signal stack are synthesized the triangular wave that has DC component.When the electric current of LED set of monomers increases; The voltage at its circuit two ends raises; This circuit parameter is amplified, adjust the up-down that circuit is adjusted electric current with pwm pulse signal control impuls after shaping that the pulse reference signal relatively obtains, present embodiment is compared with embodiment two; Can obviously reduce circuit loss, improve the efficient of adjustment circuit.
Method for controlling illuminative high-power LED of the present invention; Each LED set of monomers at the LED IC interior is provided with the current control unit that circuit modules such as sampling, amplification, comparison, adjustment are formed; The electric current of the LED set of monomers that the difference of electrical characteristic, physical characteristic and temperature characterisitic between a plurality of LED monomers causes changes; Even cause integrated circuit a part or whole part to be damaged when threatening, through the internal feedback and the dual control of external action of current control unit, effectively adjust circuit and return to normal condition; The unified operating current of regulating all LED monomers; Make its current constant, distributed uniform, thereby reach the purpose of temperature-compensating, and guarantee that the whole LED performance of integrated circuits is stable, reliable, long service life.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction,, anyly be familiar with the professional and technical personnel though the present invention discloses as above with preferred embodiment; Make a little change or be modified to the equivalent embodiment of equivalent variations when the technology contents of above-mentioned announcement capable of using, all still belong in the scope of technical scheme of the present invention.
Claims (3)
1. a method for controlling illuminative high-power LED is a method of a plurality of LED monomers being carried out grouping management, it is characterized in that may further comprise the steps:
Step 1 is set basic parameter, produces modulation signal, and with basic parameter and modulation signal stack composite pulse reference signal;
Step 2 is taken a sample, is amplified the circuit parameter of each LED set of monomers, obtains the sampling amplifying signal;
Step 3, relatively take a sample amplifying signal and pulse reference signal obtain pwm pulse signal;
Step 4 when pwm pulse signal shows that the sampling amplifying signal of certain LED set of monomers departs from the pulse reference signal, is adjusted the electric current of this LED set of monomers;
Step 5, sharing control is when the electric current of a LED set of monomers during greater than other LED set of monomers, to other LED monomer component distribution stream.
2. method for controlling illuminative high-power LED according to claim 1 is characterized in that the sample circuit sharing control step of described step 2 can realize through the flow equalizing circuit that resistance or resistance-capacitance network constitute simultaneously.
3. method for controlling illuminative high-power LED according to claim 1 is characterized in that described step 4 realizes through pulse adjustment circuit; Described step 3, between four, also comprise shaping pulse step to pwm pulse signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100848880A CN101557668B (en) | 2009-05-26 | 2009-05-26 | Method for controlling illuminative high-power LED |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100848880A CN101557668B (en) | 2009-05-26 | 2009-05-26 | Method for controlling illuminative high-power LED |
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| CN101557668A CN101557668A (en) | 2009-10-14 |
| CN101557668B true CN101557668B (en) | 2012-07-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102271438B (en) * | 2010-06-04 | 2013-12-25 | 金威贸易有限公司 | Lighting device using even alternating current (AC) for driving light-emitting diodes (LEDs) |
| CN101896027B (en) * | 2010-06-14 | 2014-03-12 | 深圳市京泉华科技股份有限公司 | Method and circuit for controlling multi-path current distribution of LED power supply |
| CN102685991B (en) * | 2012-05-25 | 2014-01-15 | 江苏三显照明科技有限公司 | LED luminous-attenuation-resistant power supply circuit |
| TWI564858B (en) * | 2015-06-24 | 2017-01-01 | Macroblock Inc | Light - emitting diode control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201042092Y (en) * | 2007-05-17 | 2008-03-26 | 陈文良 | Efficient multi-channel LED equable current control circuit |
| CN101310568A (en) * | 2005-11-14 | 2008-11-19 | 新田株式会社 | Fluorescent lamp operation device |
| CN201167423Y (en) * | 2008-01-16 | 2008-12-17 | 达方电子股份有限公司 | Circuit for equalizing current |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101310568A (en) * | 2005-11-14 | 2008-11-19 | 新田株式会社 | Fluorescent lamp operation device |
| CN201042092Y (en) * | 2007-05-17 | 2008-03-26 | 陈文良 | Efficient multi-channel LED equable current control circuit |
| CN201167423Y (en) * | 2008-01-16 | 2008-12-17 | 达方电子股份有限公司 | Circuit for equalizing current |
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Granted publication date: 20120725 Termination date: 20170526 |