CN102883506B - Method for dynamically controlling temperature of central area of array light emitting diode (LED) lighting lamp - Google Patents
Method for dynamically controlling temperature of central area of array light emitting diode (LED) lighting lamp Download PDFInfo
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- CN102883506B CN102883506B CN201210356239.3A CN201210356239A CN102883506B CN 102883506 B CN102883506 B CN 102883506B CN 201210356239 A CN201210356239 A CN 201210356239A CN 102883506 B CN102883506 B CN 102883506B
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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
Abstract
The invention discloses a method for dynamically controlling temperature of a central area of an array light emitting diode (LED) lighting lamp. According to the method, a characteristic that forward voltage drop of a positive-negative (PN) junction of an LED luminescent tube declines linearly along with the increasing of the temperature is utilized to detect the temperature of an LED lighting array; after a microprocessor acquires the temperature of each area, the on-time of the LED luminescent tubes on each level in the center area of an LED luminescent tube array are regulated in a pulse width modulation (PWM) way, and the average working current of the LED luminescent tubes is regulated, so that the temperature of the LEDs in different level areas in the center can be dynamically controlled, and the temperature is maintained in a range of (120+/-5) percent of the temperature of LED lamps in an utmost periphery low-temperature area. By the method, under the condition that overall luminance is not influenced basically, the temperature of the center area of the LED luminescent tube array can be effectively reduced, the luminous efficiency of the LED luminescent tubes can be improved, the power consumption of the LED lamps can be reduced, and the service lives of the LED luminescent tubes in the center area and the whole LED lamp can be prolonged.
Description
Technical field
The present invention relates to a kind of array-type LED lighting central area temperature dynamic control method, belong to LED lighting technical field.
Background technology
LED illumination is a kind of lighting technology developing rapidly in recent years, compares with traditional lighting light source, and LED lighting technology has the advantages such as operating voltage is low, little power consumption, luminous efficiency is high, the life-span is long.Current existing LED lighting is than incandescent lamp power saving more than 80%, than energy-saving fluorescent lamp power saving more than 50%.Under the overall background reducing discharging at national energy-saving, the characteristic of the low energy consumption of LED illumination, will become the main flow that lighting technology develops, and in China's illumination market, will have wide development space.
The most small volume of LED luminous tube, for increasing brightness of illumination, its ligthing paraphernalia adopts the form of LED luminous tube array more.The heating of great power LED etc. is comparatively serious, and especially in the central area of LED luminous tube array, due to the tropical island effect of lamp lighting array, the temperature of central area can be significantly higher than outer peripheral areas.Temperature overheating will cause LED luminous tube aging rapidly, and reduce useful life, therefore must guarantee that LED lighting itself can not be overheated when work.In addition, if the heating of LED light fixture is serious, its luminous efficiency will reduce greatly, and energy consumption increases, and not only will solve problems of excessive heat from improving the heat-sinking capability aspect of light fixture for this reason, also will reduce from source the heating situation of LED lamp.
Existing reduction LED lighting heating method is to adopt the external cooling measures such as fin, fan to reduce temperature mostly, utilizes thermal resistance, thermocouple light temperature transducer to detect the temperature of LED luminous tube.For these class methods, there is following shortcoming:
1) increased outside mechanical structure, the volume of light fixture also increases thereupon, and affects attractive in appearance;
2) mode of fan cooling has not only increased the electric energy loss of light fixture, and has increased the probability that light fixture damages;
3) no matter be fin or fan cooling, be all, in the situation that LED lighting has generated heat, it is carried out to auxiliary heat dissipation, now electric energy has had very most ofly due to heating loss, and luminous efficiency reduces greatly, has reduced LED illumination low energy consumption advantage;
4) temperature detection adopts external sensor, increases cost, and easily because installation of sensors is improper, causes the bad problem of conducting heat;
Whole LED luminous tube arrays are dispelled the heat, rather than the serious key area that generates heat is controlled, strengthened cooling measure sphere of action and cost.
Summary of the invention
The object of the invention is in order to solve the problem of LED lighting central area temperature overheating, overcome complicated in mechanical structure in traditional cooling method simultaneously, increase energy consumption, need the shortcoming of external temperature transducer, a kind of method of dynamically controlling LED lighting zone line LED luminous tube break-make with different duty is proposed, realize LED luminous tube array high-temperature area temperature and control, in the situation that minimum degree affects light fixture overall brightness, make LED luminous tube array central area temperature significantly reduce.
The technical solution used in the present invention is: a kind of array-type LED lighting central area temperature dynamic control method, the method raises and approximately linear negative characteristic with temperature according to LED luminous tube PN junction forward voltage drop, by real-time measurement and gather the pressure drop of LED luminous tube PN junction obtain LED luminous tube array from periphery the temperature to different levels region, center LED; Microprocessor carries out PWM(pulse-width modulation output to LED luminous tube array center different levels regional temperature respectively by pid algorithm) closed-loop control, with 200-500Hz frequency, through power amplifier module, drive conducting and the deadline of controlling each level region LED luminous tube of LED luminous tube array center.
Further; array-type LED lighting of the present invention central area temperature dynamic control method; the method for acquiring temperature of described LED luminous tube array is: in the center ranks of LED luminous tube array, each LED luminous tube is set to thermometric LED luminous tube; each thermometric LED luminous tube pressure drop accesses microprocessor after over-voltage over-current protection circuit, and the center ranks from outside to inside same layer LED luminous tube at each thermometric LED luminous tube correspondence position place link together on electric.This partitioned mode and electric connecting mode are suitable for rectangle LED luminous tube array, round LED luminous tube array and other shapes LED luminous tube array.Described microprocessor comprises AD input port, some roads and some roads PWM delivery outlet, described power amplifier module comprises some MOSFET pipe, and the AD input interface by microprocessor obtains the PN junction pressure drop of each LED luminous tube of center ranks and then obtains each layer of LED light temperature; By the break-make of PWM delivery outlet output pwm signal power ratio control amplification module, thus the intermittently conducting of the variant level of control centre region LED luminous tube.Concrete steps are:
Steps A accesses each thermometric LED luminous tube pressure drop of LED luminous tube array center ranks some corresponding A D input port of microprocessor after over-voltage over-current protection circuit;
Step B, by central area from outside to inside every layer thermometric LED luminous tube correspondence same layer LED luminous tube link together, some high-power MOSFETs are accessed respectively in the current supply circuit of each layer of LED luminous tube in central area, in order to control the break-make of every layer of LED luminous tube power supply, the pwm signal output of microprocessor is connected to the gate pole of MOSFET after isolation;
Step C, after array-type LED lighting is opened, first microprocessor keeps the full duty ratio output of PWM delivery outlet, make MOSFET in conducting state always, at first minute that works, uniformity of temperature profile, when central area temperature does not significantly rise, begins to gather, store to the PN junction initial drop of the thermometric LED luminous tube of center ranks;
Step D, microprocessor obtains the pressure drop of LED luminous tube array center each thermometric LED luminous tube of ranks continuously by AD converter, according to PN junction pressure drop temperature, raise and the characteristic of approximately linear decline, the PN junction initial drop of obtaining in integrating step C, calculates each level LED luminous tube temperature of central area and the temperature difference of outermost low-temperature region LED luminous tube;
Step e, utilize resulting temperature difference in step D, by increment type PID algorithm, control centre's each layer, region LED luminous tube temperature, within the scope of (120 ± 5) % of outermost region LED luminous tube temperature, calculates the new pwm signal output duty cycle D in each layer of central area respectively
n;
As the new duty ratio D calculating
nlower than the lowest duty cycle D that does not affect brightness
min, according to lowest duty cycle D
min, with the FREQUENCY CONTROL MOSFET conducting of 200-500Hz, return to step D and start next control cycle.
As the new duty ratio D calculating
nhigher than the lowest duty cycle D that does not affect brightness
min, according to the duty ratio D of new calculating
n, with the FREQUENCY CONTROL MOSFET conducting of 200-500Hz, return to step D and start next control cycle.
Further, array-type LED lighting of the present invention central area temperature dynamic control method, described pwm power amplification module is high-power MOSFET, its maximum current approximately centered by different levels region LED luminous tube 1.5 times of required electric current when complete conducting.
Beneficial effect of the present invention:
1) simple in structure, do not take the volume of too much light fixture, do not affect light fixture attractive in appearance;
2) the needed signal acquisition circuit of the method, microcontroller circuit, power amplifier module power consumption are all very low, almost negligible with respect to the power consumption of LED lighting, do not increase the extra energy consumption of light fixture;
3) method is cutting point from the control method of pyrotoxin LED luminous tube itself, to reduce the mode of ON time, reduce the heating of LED luminous tube array central area, not only can reach the object of cooling, and can improve the luminous efficiency of LED lighting, reduce thermal losses, give full play to the advantage of LED illumination low energy consumption;
4) method, without external temperature transducer, reduces costs, and can avoid causing because installation of sensors is improper bad, the inaccurate problem of temperature detection of conducting heat;
5) method respectively control centre divide the different levels LED ON time of luminous tube, each level refinement is controlled, and temperature at all levels is all remained within the scope of (120 ± 5) of peripheral temperature %, can minimum level affect lamp brightness.
Accompanying drawing explanation
Fig. 1 is the applicable rectangle LED luminous tube array schematic diagram of the present invention.
Fig. 2 is the applicable round LED luminous tube array schematic diagram of the present invention.
Fig. 3 is that the present invention's temp measuring method PN junction used pressure drop temperature raises and approximately linear decline schematic diagram.
Fig. 4 is overall structure schematic diagram of the present invention.
Fig. 5 is PID closed-loop control schematic diagram of the present invention.
Wherein: 1-thermometric LED luminous tube, 2-LED luminous tube array outermost region, 3-LED luminous tube array innermost layer region.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5 shown in, embodiment provides a kind of array-type LED lighting central area temperature dynamic control method.Control object be LED lighting heating serious different levels region, LED luminous tube array center.As depicted in figs. 1 and 2, temperature checking method is by obtaining each thermometric LED luminous tube 1 (Fig. 1 of center ranks, middle ranks dotted line LED luminous tube in Fig. 2) PN junction pressure drop, utilize PN junction pressure drop temperature as shown in Figure 3 to raise and the characteristic of approximately linear decline, obtain the temperature (comprising LED luminous tube array outermost region 2 and LED luminous tube array innermost layer region 3) of LED luminous tube at all levels in LED luminous tube array.As shown in Figure 4 and Figure 5, microprocessor by AD input port, measure in real time and gather in the middle of the pressure drop of ranks thermometric LED luminous tube PN junction obtain LED luminous tube array from periphery the temperature to different levels region, center LED luminous tube, by pid algorithm, respectively LED array center different levels regional temperature is carried out to closed-loop control, with 200-500Hz frequency output pwm control signal, through power amplifier module MOSFET pipe, drive the make-and-break time of controlling each level region LED luminous tube of LED array center, adjust its average operating current, and then control its temperature, each layer, center LED luminous tube temperature all remained within the scope of (120 ± 5) % of outermost region LED luminous tube temperature.
Centered by the electric connecting mode of the LED luminous tube in different levels region, described LED luminous tube array center outside region to the same layer LED luminous tube at interior each thermometric LED luminous tube correspondence position place, on this layer of LED luminous tube is electric, link together.The partitioned mode of the present embodiment and electric connecting mode are applicable to rectangle LED luminous tube array (as shown in Figure 1), are also for round LED luminous tube array (as shown in Figure 2) and other shapes LED luminous tube array.
The present embodiment array-type LED lighting central area temperature dynamic control method specific works process comprises the following steps:
Steps A accesses each thermometric LED luminous tube pressure drop of LED luminous tube array center ranks some corresponding A D input port of microprocessor after over-voltage over-current protection circuit;
Step B, by central area from outside to inside every layer thermometric LED luminous tube correspondence same layer LED luminous tube link together, some high-power MOSFETs are accessed respectively in the current supply circuit of each layer of LED luminous tube in central area, in order to control the break-make of every layer of LED luminous tube power supply, the pwm signal output of microprocessor is connected to the gate pole of MOSFET after isolation;
Step C, after array-type LED lighting is opened, first microprocessor keeps the full duty ratio output of PWM delivery outlet, make MOSFET in conducting state always, at first minute that works, uniformity of temperature profile, when central area temperature does not significantly rise, begins to gather, store to the PN junction initial drop of the thermometric LED luminous tube of center ranks;
Step D, microprocessor obtains the pressure drop of LED luminous tube array center each thermometric LED luminous tube of ranks continuously by AD converter, according to PN junction pressure drop temperature, raise and the characteristic of approximately linear decline, the PN junction initial drop of obtaining in integrating step C, calculates each level LED luminous tube temperature of central area and the temperature difference of outermost low-temperature region LED luminous tube;
Step e, utilize resulting temperature difference in step D, by increment type PID algorithm, control centre's each layer, region LED luminous tube temperature, within the scope of (120 ± 5) % of outermost region LED luminous tube temperature, calculates the new pwm signal output duty cycle D in each layer of central area respectively
n;
As the new duty ratio D calculating
nlower than the lowest duty cycle D that does not affect brightness
min, according to lowest duty cycle D
min, with the FREQUENCY CONTROL MOSFET conducting of 200-500Hz, return to step D and start next control cycle.
As the new duty ratio D calculating
nhigher than the lowest duty cycle D that does not affect brightness
min, according to the duty ratio D of new calculating
n, with the FREQUENCY CONTROL MOSFET conducting of 200-500Hz, return to step D and start next control cycle.
The beneficial effect of the present embodiment is to have realized LED lighting central area temperature dynamic to control, and can effectively control LED luminous tube array central area heating situation, and minimum degree affect integral illumination brightness; System configuration is simple, does not have movable part, is convenient to install, and does not affect light fixture good looking appearance, and reliability is high, and the life-span is long; Do not increase the extra energy consumption of light fixture, and can effectively improve luminous efficiency, give full play to LED illumination low energy consumption advantage; Do not need temperature sensor, can reduce costs, and can avoid causing because installation of sensors is improper bad, the inaccurate problem of temperature detection of conducting heat; Control area is few, only controls the serious central area of heating, and cost is low, and complexity is low, and cost performance is high, is applicable to producing in enormous quantities.
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each part all available prior art realized.
Claims (1)
1. an array-type LED lighting central area temperature dynamic control method, it is characterized in that: the method raises and approximately linear negative characteristic with temperature according to LED luminous tube PN junction forward voltage drop, by real-time measurement and gather the pressure drop of LED luminous tube PN junction obtain LED luminous tube array from periphery the temperature to different levels region, center LED; Microprocessor carries out PWM closed-loop control to LED luminous tube array center different levels regional temperature respectively by pid algorithm, drives conducting and the deadline of controlling each level region LED luminous tube of LED luminous tube array center with 200-500Hz frequency, through power amplifier module;
The method for acquiring temperature of described LED luminous tube array is: in the center ranks of LED luminous tube array, each LED luminous tube is set to thermometric LED luminous tube, each thermometric LED luminous tube pressure drop accesses microprocessor after over-voltage over-current protection circuit, and the center ranks from outside to inside same layer LED luminous tube at each thermometric LED luminous tube correspondence position place link together on electric; Described microprocessor comprises AD input port, some roads and some roads PWM delivery outlet, described power amplifier module comprises some MOSFET pipe, and the AD input interface by microprocessor obtains the PN junction pressure drop of each LED luminous tube of center ranks and then obtains each layer of LED light temperature; By the break-make of PWM delivery outlet output pwm signal power ratio control amplification module, thus the intermittently conducting of the variant level of control centre region LED luminous tube, and concrete steps are:
Steps A accesses each thermometric LED luminous tube pressure drop of LED luminous tube array center ranks some corresponding A D input port of microprocessor after over-voltage over-current protection circuit;
Step B, by central area from outside to inside every layer thermometric LED luminous tube correspondence same layer LED luminous tube link together, some high-power MOSFETs are accessed respectively in the current supply circuit of each layer of LED luminous tube in central area, in order to control the break-make of every layer of LED luminous tube power supply, the pwm signal output of microprocessor is connected to the gate pole of MOSFET after isolation;
Step C, after array-type LED lighting is opened, first microprocessor keeps the full duty ratio output of PWM delivery outlet, make MOSFET in conducting state always, at first minute that works, uniformity of temperature profile, when central area temperature does not significantly rise, begins to gather, store to the PN junction initial drop of the thermometric LED luminous tube of center ranks;
Step D, microprocessor obtains the pressure drop of LED luminous tube array center each thermometric LED luminous tube of ranks continuously by AD converter, according to PN junction pressure drop temperature, raise and the characteristic of approximately linear decline, the PN junction initial drop of obtaining in integrating step C, calculates each level LED luminous tube temperature of central area and the temperature difference of outermost low-temperature region LED luminous tube;
Step e, utilize resulting temperature difference in step D, by increment type PID algorithm, control centre's each layer, region LED luminous tube temperature, within the scope of (120 ± 5) % of outermost region LED luminous tube temperature, calculates the new pwm signal output duty cycle D in each layer of central area respectively
n;
As the new duty ratio D calculating
nlower than the lowest duty cycle D that does not affect brightness
min, according to lowest duty cycle D
min, with the FREQUENCY CONTROL MOSFET conducting of 200-500Hz, return to step D and start next control cycle;
As the new duty ratio D calculating
nhigher than the lowest duty cycle D that does not affect brightness
min, according to the duty ratio D of new calculating
n, with the FREQUENCY CONTROL MOSFET conducting of 200-500Hz, return to step D and start next control cycle;
Described pwm power amplification module is high-power MOSFET, its maximum current approximately centered by different levels region LED luminous tube 1.5 times of required electric current when complete conducting.
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| CN104535913B (en) * | 2015-01-12 | 2017-12-19 | 华南师范大学 | The heat testing method and test system of LED component with built-in temperature detection |
| CN111970800B (en) * | 2020-08-31 | 2023-04-18 | 深圳市纵维立方科技有限公司 | Control method and device of ultraviolet light source and printing equipment |
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