CN101616524A - A kind of commercial LED illumination driver - Google Patents
A kind of commercial LED illumination driver Download PDFInfo
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- CN101616524A CN101616524A CN200910041469A CN200910041469A CN101616524A CN 101616524 A CN101616524 A CN 101616524A CN 200910041469 A CN200910041469 A CN 200910041469A CN 200910041469 A CN200910041469 A CN 200910041469A CN 101616524 A CN101616524 A CN 101616524A
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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
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- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of commercial LED illumination driver.It comprises rectification module, and its input inserts utility grid, and input current is carried out rectification and filtering; Active quasi-resonance power factor correction module, its input links to each other with the rectification module output, can suppress the harmonic wave that led driver produces, and power factor is compensated; The direct voltage output module, its input links to each other with the output of active quasi-resonance power factor correction module, for load LED lamp string provides operating voltage.The present invention is applied to the APFC of quasi-resonance working method in the design of LED illumination driver, realizes the substance of LED illumination driver power factor is improved.The power factor of LED illumination driver is risen to more than 0.99 from 0.5-0.57, the mains by harmonics quality index is included in the specific design of LED illumination driver, the form factor of LED illumination driver is improved to below 1.2 by about 2.
Description
Technical field
The present invention relates to a kind of drive circuit, particularly a kind of commercial LED illumination driver.
Background technology
Electric source lighting has experienced incandescent lamp, fluorescent lamp, high-intensity gas discharge lamp three generation products, and light efficiency improves constantly, and power consumption constantly descends, and the light of electricity has played crucial effects to development of human society.Today, because the progress of semiconductor technology, another new electric light source LED light-emitting diode with energy-saving and environmental protection, longevity, reliable, volume is small and exquisite, color is various, anti-flicker, anti-vibration etc. comprehensively advantages substitute traditional electric light sources and influence our life, start the 4th revolution of Lighting Industry.Many producers have noticed the bright prospects that light-emitting diode is used at lighting field, have developed the semiconductor lamp of making light source with light-emitting diode.But the electrical characteristic of light-emitting diode is different fully with traditional electric light source, and how rational driven for emitting lights diode makes its work reliably is to make the matter of utmost importance that semiconductor lamp faces.Light-emitting diode is a kind of device of low voltage direct current work, dynamic electric resistor is very little during conducting, therefore, the small change in voltage in light-emitting diode two ends will produce very big electric current variation in the work, the brightness of light then lamp is unstable and shorten life-span of lamp, and is heavy then make the light-emitting diode damage immediately.Therefore, can not simply receive light-emitting diode on the voltage source, must use led driver driven for emitting lights diode.Led driver is for semiconductor lamp, and its status just is equivalent to the ballast of fluorescent lamp, and role is exactly the unsettled voltage of external power supply to be become galvanic current stream supply with light-emitting diode work.Therefore, in fact led driver is exactly a kind of non-linear voltage/power pack.Carry out semiconductor lamp and just must reasonably select led driver for use.And LED illumination driver research at present still is in the starting stage, and the research emphasis of each producer mostly is placed in the exploitation of LED chip for driving itself, and also design does not propose total solution to the LED illumination driver.From present known LED illumination driver design, all do not consider the influence of whole efficiency lifting, the excavation in useful life and the led drive circuit of led light source drive circuit for power grid quality, led light source is not also considered power factor compensation and the harmonic wave problems such as influence to electrical network when lighting field is used, be capacitive load, its power factor has only 0.5-0.57, the efficiency of transmission of electrical network is reduced greatly, and press civil buildings electrical design code requirement, it is just qualified that the power factor of power consumption equipment should reach more than 0.85.Because led drive circuit must be finished the AC/DC translation function, for realizing some electronic switching circuits and PWM pulse-width modulator also being set to effective control of LED operating current, make the LED illumination driver very serious to the harmonic effects of electrical network, its harmonic component is up to about 110%, form factor K value produces serious high order harmonic component to electrical network and pollutes up to more than 2.In addition, when led light source is used in the through engineering approaches of lighting field, after high brightness work a period of time, often because light decay is serious, after 1 year maximum 2 years, its actual luminous quantity descends significantly, and its illumination loss will be forced to finish its useful life in advance above 30%, its actual life is only about 5000 hours, although led light source can reach 100,000 hours in theory useful life, the improper use owing to led chip reaches desired value its actual life far away.
Summary of the invention
In order to solve the above problems, the object of the present invention is to provide a kind of power factor height, to the little LED illumination driver of electrical network high order harmonic component influence, the overall efficiency when it can increase substantially the light source use.
Another object of the present invention is the useful life of effectively improving led light source.
The present invention solves the technical scheme that its problem adopts: a kind of commercial LED illumination driver, and it comprises:
Rectification module, its input inserts utility grid, and input current is carried out rectification and filtering;
Active quasi-resonance power factor correction module, its input links to each other with the rectification module output, can suppress the harmonic wave that led driver produces, and power factor is compensated;
The direct voltage output module, its input links to each other with the output of active quasi-resonance power factor correction module, for LED lamp string provides operating voltage;
As improvement of the technical scheme, described rectification module input is connected with the em filtering module, and its input inserts utility grid, can the harmonic wave that led driver produces be suppressed and absorb, thereby do not influence power grid quality.
As further improvement in the technical proposal, described active quasi-resonance power factor correction module comprises energy storage inductor, described energy storage inductor input connects the output of rectification module, described energy storage inductor output connects the input of direct voltage output module, described energy storage inductor output also is connected with power switch, described power switch also is connected with the logic control driver element, described logic control driver element is connected to the output of rectification module by the input voltage sampling unit, be provided with the current feedback unit between described power switch and the input voltage sampling unit output, link to each other by high-frequency current zero passage detection unit between described energy storage inductor and the logic control driver element.
As further improvement in the technical proposal, link to each other by the voltage limit protected location between described direct voltage output module and the input voltage sampling unit, described voltage limit protected location also links to each other with the logic control driver element.
As further improvement in the technical proposal, described rectification unit is connected with logic control circuit low tension power module, and it is used for to each logic control circuit power supply.
As further improvement in the technical proposal, described driver also is provided with the MCU module, described MCU module is connected with temperature detecting unit and power drive unit, described temperature detecting unit can detect the temperature of load LED lamp string, after described MCU module is carried out calculation process to detected load LED lamp string temperature, output signal to power drive unit, load LED lamp string is carried out power adjustments by power drive unit.
As further improvement in the technical proposal, described power drive unit comprises the energy storage inductor that connects load LED lamp string, described energy storage inductor is connected with power switch, described power switch is connected with current sampling unit, described current sampling unit connects the MCU module by voltage-dropping type constant current tunable optical driving control unit, and described voltage-dropping type constant current tunable optical driving control unit also links to each other with power switch.
As further improvement in the technical proposal, can also connect luminance detection unit or brightness adjusting unit on the described MCU module, it can detect the luminous intensity and the surrounding environment brightness of load LED lamp string, described MCU module is carried out calculation process to detected ambient brightness signal, output signal to power drive unit, load LED lamp string is carried out power adjustments by power drive unit.
The invention has the beneficial effects as follows: commercial LED illumination driver of the present invention is provided with the source power factor correcting circuit after rectification unit, need not isolating transformer, direct output of DC current is pressed, reduced the link of power transfer, the capacity usage ratio height, because circuit of power factor correction is in the quasi-resonance operating state, reduced the energy loss of high frequency conversion, improve the energy service efficiency, reduced the harmonic component of current/voltage simultaneously, thereby improved the power factor of whole driving, and effectively suppressed harmonic wave; Its operating current is in continuous state simultaneously, effectively reduces harmonic component, and makes electric current identical with the phase place of input voltage, and the power factor of entire circuit is brought up to more than 0.99, has reduced the pollution of harmonic wave to electrical network.
In addition, in driver, be provided with temperature detecting unit, with the working temperature of led chip optimal control parameter as driver, fundamentally guarantee led chip in use can be because of temperature too high or thermal breakdown and cause light decay, shorten the useful life of led chip, fully excavate the long-life advantage of led light source, the through engineering approaches of led chip was brought up to more than 50000 hours from present 5000 hours useful life.
The present invention realizes the optimizing control models of illumination, brightness, operating current, PWM pulse-width modulation in the design of LED illumination driver, carry out various control signals such as temperature control, brightness of illumination control and be optimized processing, LED lamp string controlled function intelligent, that stylize is provided, hommization, intelligent controlled function such as realization LED lamp string luminous efficiency height, long service life, control device is flexible, scene effect is variable, and improve the synthesis energy saving rate of LED illumination driver more than 10%, to effectively save all kinds of social resources, thereby obtain good social benefit.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is a principle of the invention block diagram;
Fig. 2 is driver portion circuit theory diagrams of the present invention;
Fig. 3 is a MCU modular circuit schematic diagram of the present invention;
Fig. 4 is temperature detection part circuit theory diagrams of the present invention;
Fig. 5 is a luminance detection partial circuit schematic diagram of the present invention;
Fig. 6 is the circuit theory diagrams that in the power drive unit of the present invention LED lamp string carried out power adjustments.
Embodiment
With reference to Fig. 1, Fig. 2, a kind of commercial LED illumination driver of the present invention, it comprises
The em filtering module is EMC/EMI in the present invention, and its input connects the electrical network input, and it can suppress the harmonic wave that led driver produces and absorb, thereby does not influence power grid quality; It is suppressed inductance L 1 and is connected across its two ends filter capacitor C1, C2 to form by harmonic wave.Because adopt quasi-resonance Active Power Factor Correction scheme, driver is very little to the harmonic effects of electrical network.Therefore, adopt simple capacitor filtering and inductance harmonic wave to suppress to reach good EMC/EMI power grid quality control index.
Rectification module, its input links to each other with the output of em filtering module, and input current is carried out rectification and filtering, and it is made up of the rectifier diode D1, the D2 that form bridge rectifier, D3, D4 and filter capacitor C3.
Active quasi-resonance power factor correction module, its input links to each other with the rectification module output, can suppress the harmonic wave that led driver produces, and power factor is compensated.
In the present embodiment, described active quasi-resonance power factor correction module comprises energy storage inductor, described energy storage inductor input connects the output of rectification module, its output connects the input of direct voltage output module, described energy storage inductor output also is connected with power switch, described power switch also is connected with the logic control driver element, described logic control element is connected to the output of rectification module by the input voltage sampling unit, be provided with the current feedback unit between described power switch and the input voltage sampling unit output, link to each other by high-frequency current zero passage detection unit between described energy storage inductor and the logic control driver element.Link to each other by the voltage limit protected location between described direct voltage output module and the input voltage sampling unit, described voltage limit protected location also links to each other with the logic control driver element.Power factor correction module adopts the L6562 chip to design, wherein R9, the sampling of R10 input voltage, C9 is an input voltage sampling filter electric capacity, R11, R12, C10, T1 are that current over-zero detects, T1 double as energy storage inductor wherein, R14, C11, C12 are compensating circuit, R15, R16 are current feedback, R17, R18 output voltage feedback, Q3 is the power factor correction switch pipe.This power factor correction module adopts the inhibition of band harmonic wave, active, quasi-resonance circuit of power factor correction, when being intended to improve power factor, makes harmonic component as far as possible little.Conducting by exporting modulated high-frequency PWM pulse-width signal power controlling switch at the logic control driver element and ending.When the power switch conducting, the energy storage inductor energy storage of magnetizing; When power switch ends, because the afterflow effect of inductance produces induced potential and is superimposed upon on the input voltage, thereby have sufficiently high voltage to give the electric capacity charging of direct voltage output unit, even input voltage magnitude of voltage this moment is very low, input current also is continuous (non-vanishing).Therefore, input current can be modulated in the sinusoidal period of whole input voltage, can obtain very high power factor.
In addition, carry out zero passage detection by high-frequency current to energy storage inductor, make the logic control driver element begin to export high level constantly and trigger the power switch conducting, make the modulating frequency of entire circuit and the frequency of high-frequency current be in the quasi-resonance operating state in the high-frequency current zero passage.The duty ratio of PWM pulse-width modulation is then followed the tracks of adjusting by the logic control driver element according to the result of input voltage sampled value and the comparison of current feedback average, and when electric current reduced, the power switch ON time prolonged; When current value increases, the power switch ON time shortens, thereby the instantaneous value (waveform) at the equal may command input current tracking of the sinusoidal period of whole input voltage input voltage makes input current identical with the phase place of input voltage, and power factor is brought up to more than 0.99.
The direct voltage output module, its input links to each other with the output of active quasi-resonance power factor correction module, for LED lamp string provides operating voltage.It is made up of anti-phase blocking diode D9 and filter capacitor C13, C14.
As optimal way, described rectification unit is connected with logic control circuit low tension power module, and it is used for to each logic control circuit power supply.Adopt D5, D6, Q1, Q2, C18, R4, R5, R6, R7 to form an electronic switch at the working power terminal place of L6562 chip in addition, when dim signal will control the power supply disconnection near zero the time, circuit of power factor correction, led chip drive circuit are not all powered up, the quiescent dissipation of whole commercial LED driver is descended, enter energy-saving mode work.
To Fig. 6,, establish led chip working temperature closed-loop control function with reference to figure 3 for excavating led light source long-life advantage in use.Working temperature by real-time collection LED lamp serial core sheet is controlled the operating current or the PWM pulse-width modulation characteristic of LED lamp string, automatically control the PN junction temperature of led chip when work, prevent that led chip from the PN junction of the out of control even thermal breakdown led chip of heating occurring in when work, influence the life-span of led chip, described driver also is provided with the MCU module, described MCU module is connected with temperature detecting unit and power drive unit, described temperature detecting unit can detect the temperature of load LED lamp string, adopt the temperature of temperature sensor in the negative pole bond pad locations sampling A of led chip, described temperature sensor is preferably thermistor or thermocouple, after the sampling end of described MCU module carries out calculation process with the detected LED lamp of temperature sensor string temperature, output signal to power drive unit, load LED lamp string is carried out power adjustments by power drive unit.
As preferably, described temperature closed loop control can be adopted following method.The led chip temperature detecting unit adopts the thermistor of small size or near the temperature of the thermocouple sampling A negative pole bond pad locations of middle certain led chip of LED dot matrix.
According to the packaging technology of present led chip, the caloric value of led chip PN junction about 90% is to derive from the negative pole of LED.When adopting obedient sheet to install, led chip contacts very good with aluminium base, if be coated with the good silica gel of one deck heat conduction again when led chip welds, then can be similar to and think that the temperature of led chip negative pole solder joint is the heat sink temperature of LED.Therefore, when the led chip heat sink temperature is measured, adopt the solder joint of the nearly LED negative pole of temperature-sensitive element card to measure approximate the acquisition.Thermal resistance is the ratio of the power that dissipates on the temperature difference on the heat passage and passage, and for LED, thermal resistance generally is meant from the thermal resistance of led chip PN junction on heat sink.If the power consumption that junction temperature is TJ, the temperature on heat sink is Tc, LED is PD, then the relation of RJc and TJ, Tc and PD can be expressed as:
RJC＝(TJ-TC)/PD
In the following formula: the thermal resistance that RJC is the led chip PN junction on heat sink, TJ is the temperature of led chip PN junction, and TC is the temperature of led chip on heat sink, and PD is a heating power, and the unit of PD is W.
When normal the use, PD is relevant by the duty ratio K1 (K1 is 1 when adopting continuous constant current to work) and the efficient K2 of the opto-electronic conversion of led chip own of electric current with the interior led chip of forward current IF, unit interval of forward voltage drop VF, the LED of LED, and its relational expression can be described as:
PD＝K1*K2*VF*IF
In heat radiation is calculated, after having selected great power LED, from data information, can find its RJC value; COEFFICIENT K 2 is a constant, the given signal of brightness when COEFFICIENT K 1 is the LED light modulation (when adopting adjusting LED size of current to come light modulation, COEFFICIENT K 1 is the ratio of current given electric current with respect to rated operational current); Behind the forward current IF that determines LED, can calculate PD according to the VF of LED; If measured the temperature of TC, then can obtain the PN junction junction temperature TJ of led chip by relational expression.
The Practical Formula of Practical Calculation led chip PN junction temperature is in this programme:
TJ＝K1*K2*VF*IF*RJC+TC
Because the major function of led chip is to be used for that electric energy is converted into luminous energy to solve lighting problem, therefore, the PN junction temperature controlling strategy to led chip mainly is to use as upscale protection in the present invention.Promptly when the PN junction temperature of led chip does not reach the higher limit that control sets, be as the criterion with the given signal of brightness the electrical power of led chip is controlled.When the PN junction temperature of led chip reaches or during near higher limit, then by top computing formula the given signal of brightness revised, act on led chip with revised luminance signal and be applied to electrical power on the led chip with control.
In the present embodiment, described power drive unit comprises the energy storage inductor that connects load LED lamp string, described energy storage inductor is connected with power switch, described power switch is connected with current sampling unit, described current sampling unit connects the MCU module by voltage-dropping type constant current tunable optical driving control unit, and described voltage-dropping type constant current tunable optical driving control unit also links to each other with power switch.Described energy storage inductor is used to absorb and stores the direct voltage output unit and be added in overvoltage energy partly on the load LED lamp string when the power switch conducting; When power switch turn-offs, to load LED lamp string afterflow power supply, drive efficient with the integral body that improves the LED power drive unit by energy storage inductor.Described power switch is responsible for the current supply circuit of LED lamp string is carried out switch control.Described current sampling unit is responsible for the operating current of LED lamp string is carried out closed-loop control, with the operating current of control load LED lamp string at steady state value.Described voltage-dropping type constant current tunable optical driving control unit is responsible for receiving the given dim signal to after the optimal control of load led chip, output PWM pulsewidth brightness adjustment control drive signal, the conducting of power controlling switch with end, to finish load LED lamp string is carried out constant current PWM pulsewidth dimming function.This cell driving circuit selects for use the XTL604 chip to design, and makes load LED lamp string be operated in constant-current source PWM pulsewidth brightness adjustment control state.With the power drive unit in one tunnel load LED lamp string wherein is example, and R20 is used to adjust the PWM modulating frequency, and the LD1 of 7 pin connects the PWM dim signal, and 5 pin are used for the power switch Q4 of driving LED lamp string.The adjusting of luminous power recently realizes by the duty of regulating pwm pulse.Power switch adopts metal-oxide-semiconductor Q4.Current sampling unit is made up of R22, R23, C20, C21.The operating current of load led chip is can be controlled near the higher limit, both fully excavated the operating potential of led chip, can not damage led chip by overcurrent again.Energy storage inductor is when the power switch conducting, and energy storage inductor is used to absorb the unnecessary electric energy of direct voltage output unit, when power switch turn-offs, powers to the afterflow of LED lamp string by sustained diode 12, to discharge energy stored.Wherein the mode of switch control is the control of PWM (pulse width modulation) switch, and the frequency of PWM switch control is by the control of voltage-dropping type constant current tunable optical driving control unit, and the duty ratio of PWM pulse-width regulated is regulated output after by the comprehensive various control informations of MCU automatically.
As further improvement in the technical proposal, also can connect the given unit of luminance detection unit or brightness on the described MCU module, it can detect the luminous intensity and the surrounding environment brightness of LED lamp string, described MCU module is carried out calculation process to detected ambient light illumination signal, output signal to power drive unit, carry out power adjustments by power drive unit.Be responsible on the one hand the luminous intensity of led chip is detected, participate in the operating current or the PWM duty ratio of control LED luminescent device, make the LED luminescent device be operated in the high-luminous-efficiency district, improve the photoelectric conversion efficiency of LED luminescent device; On the other hand, be responsible for the illumination of operational environment is detected, make the illumination index of operational environment both meet lighting requirement and reach certain brightness value, do not cause the illumination index too high and waste the energy again.The purpose of luminance detection mainly is to improve the overall efficiency of LED illumination driver, by the actual brightness value of real-time collecting work environment, controls the power consumption and the luminous quantity of led chip automatically.
In the present embodiment, described MCU module is selected the MC9S08QE8 microprocessor for use, to realize the working temperature of led chip, the detection of luminous intensity and the optimal control of LED lamp string light modulation.The PWM conditioning signal of LED chip for driving is that the PWM that links the MCU module regulates port, realizes the isolation fully of forceful electric power light current, promotes the global reliability of drive circuit after isolating by photoelectricity.
Temperature detection and luminous intensity detect forms bridge measuring circuit by R41, R42, R43, after both-end input differential amplifier circuit amplifies, receives the PTB3/PTB2 analog acquisition port of MCU module, realizes the signals collecting of led chip working temperature and luminous intensity.Adopt above-mentioned design, the voltage difference when utilizing energy storage inductor to bear step-down work by inductive energy storage, makes and do not lose electric energy when driving LED simultaneously, therefore the energy service efficiency is brought up to more than 95%; Adopt the current sample feedback circuit, can make the output constant current come driving LED; Adopt the PWM brightness adjustment control, can be under the operating current controlled condition that keeps LED, keep the luminous colour temperature of LED well and be not subjected to the influence of light modulation.
In addition, described direct voltage output module output can connect the series-parallel LED lamp of multichannel string, and same, every road series-parallel LED lamp string can carry out the detection and the adjustment of temperature and illumination.
The present invention's initiative is applied to the APFC of quasi-resonance working method in the design of LED illumination driver, realizes the substance of LED illumination driver power factor is improved.The power factor of LED illumination driver is risen to more than 0.99 from 0.5-0.57, make the LED illumination driver enter through engineering approaches and apply the stage.
The present invention includes the mains by harmonics quality index in the specific design of LED illumination driver in first, and the form factor of LED illumination driver is improved to below 1.2 by about 2.
The present invention initiative is with the working temperature of the led chip optimal control parameter as driver, fundamentally guarantee led chip in use can be because of temperature too high or thermal breakdown and cause light decay, shorten the useful life of led chip, fully excavate the long-life advantage of led light source, the through engineering approaches of led chip was brought up to more than 50000 hours from present 5000 hours useful life.
The present invention initiative realizes the optimizing control models of illumination, brightness, operating current, PWM pulse-width modulation in the design of LED illumination driver, improve the synthesis energy saving rate of LED illumination driver more than 10%.
In addition, the present invention has taken all factors into consideration the through engineering approaches application demand of LED illumination driver, power factor, form factor are included in the design content of LED illumination driver, the practical approach of a kind of LED of raising illumination driver power factor and reduction harmonic component has been proposed, make the LED illumination driver realize qualitative leap aspect the improvement of these two indexs, provide solid technical foundation for the LED illumination really enters the through engineering approaches stage of applying.And electricity, optics, the thermal characteristic of led light source have been taken all factors into consideration, the work operating mode of LED is carried out global optimization control, the heating problem that has solved led chip is to the led chip influence in useful life, make the index in useful life of led light source really obtain qualitative leap, make the LED illumination really possess the value that through engineering approaches is applied.Also the optical characteristics of led light source and electrology characteristic are combined and be optimized control, photoelectric conversion efficiency remains at efficient district when making led chip work, makes the overall efficiency of LED drive system improve more than 10%.
Certainly, the invention is not limited to above-mentioned execution mode, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of the utility model spirit, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (8)
1, a kind of commercial LED illumination driver is characterized in that: comprise
Rectification module, its input inserts utility grid, and input current is carried out rectification and filtering;
Active quasi-resonance power factor correction module, its input links to each other with the rectification module output, can suppress the harmonic wave that led driver produces, and power factor is compensated;
The direct voltage output module, its input links to each other with the output of active quasi-resonance power factor correction module, for load LED lamp string provides operating voltage.
2, commercial LED illumination driver according to claim 1, it is characterized in that: described rectification module input is connected with the em filtering module, its input inserts utility grid, can the harmonic wave that led driver produces be suppressed and absorb, thereby do not influence power grid quality.
3, commercial LED illumination driver according to claim 1, it is characterized in that: described active quasi-resonance power factor correction module comprises energy storage inductor, described energy storage inductor input connects the output of rectification module, described energy storage inductor output connects the input of direct voltage output module, described energy storage inductor output also is connected with power switch, described power switch also is connected with the logic control driver element, described logic control element is connected to the output of rectification module by the input voltage sampling unit, be provided with the current feedback unit between described power switch and the input voltage sampling unit output, link to each other by high-frequency current zero passage detection unit between described energy storage inductor and the logic control driver element.
4, commercial LED illumination driver according to claim 3; it is characterized in that: link to each other by the voltage limit protected location between described direct voltage output module and the input voltage sampling unit, described voltage limit protected location also links to each other with the logic control driver element.
5, commercial LED illumination driver according to claim 1 is characterized in that: described rectification unit is connected with logic control circuit low tension power module, and it is used for to each logic control circuit power supply.
6, commercial LED illumination driver according to claim 1, it is characterized in that: described driver also is provided with the MCU module, described MCU module is connected with temperature detecting unit and power drive unit, described temperature detecting unit can detect the temperature of load LED lamp string, after described MCU module is carried out calculation process to detected load LED lamp string temperature, output signal to power drive unit, load LED lamp string is carried out power adjustments by power drive unit.
7, commercial LED illumination driver according to claim 6, it is characterized in that: can also connect luminance detection unit or brightness adjusting unit on the described MCU module, it can detect the luminous intensity and the surrounding environment brightness of load LED lamp string, described MCU module is carried out calculation process to detected ambient brightness signal, output signal to power drive unit, load LED lamp string is carried out power adjustments by power drive unit.
8, according to claim 6 or 7 described commercial LED illumination drivers, it is characterized in that: described power drive unit comprises the energy storage inductor that connects load LED lamp string, described energy storage inductor is connected with power switch, described power switch is connected with current sampling unit, described current sampling unit connects the MCU module by voltage-dropping type constant current tunable optical driving control unit, and described voltage-dropping type constant current tunable optical driving control unit also links to each other with power switch.
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Application publication date: 20091230 Assignee: Shanghai Fudan Time Control Technology Co., Ltd. Assignor: Fudan Aote Science and Technology Co., Ltd., Guangzhou Contract record no.: 2013440000441 Denomination of invention: Commercial LED illumination driver Granted publication date: 20121128 License type: Exclusive License Record date: 20130912 |
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