CN106642033A - Strong heat dissipation system of LED drive power supply - Google Patents
Strong heat dissipation system of LED drive power supply Download PDFInfo
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- CN106642033A CN106642033A CN201610767513.4A CN201610767513A CN106642033A CN 106642033 A CN106642033 A CN 106642033A CN 201610767513 A CN201610767513 A CN 201610767513A CN 106642033 A CN106642033 A CN 106642033A
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- 230000017525 heat dissipation Effects 0.000 title abstract description 15
- 239000000758 substrate Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 abstract description 31
- 230000000694 effects Effects 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 9
- 230000002035 prolonged effect Effects 0.000 abstract 1
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- 238000006243 chemical reaction Methods 0.000 description 7
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- 230000033228 biological regulation Effects 0.000 description 3
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- 238000002474 experimental method Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
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- 238000012546 transfer Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000003679 aging effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
- F21V29/508—Cooling arrangements characterised by the adaptation for cooling of specific components of electrical circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a strong heat dissipation system of an LED drive power supply. The strong heat dissipation system comprises a heat dissipation base plate and a heat dissipation circuit which is arranged on the heat dissipation base plate and is connected with wires of the LED drive power supply. In a strong heat dissipation circuit design device of the LED drive power supply, the heat dissipation base plate is connected with a zener in parallel for performing protection on over-voltage, over-current and over-heat. In the strong heat dissipation circuit design device of the LED drive power supply, temperature compensation of the LED drive power supply is utilized and a light dimming circuit of the LED drive power supply is optimized, so that a heat dissipation technology of the LED drive power supply is intelligently solved, and the heat dissipation effect is improved. In the strong heat dissipation circuit design device of the LED drive power supply, the circuit of the drive power supply is technically optimized, so that the bottleneck that the service life of the existing LED drive power supply is short is solved, and the service life of the drive power supply is prolonged.
Description
Technical field
The present invention relates to field of radiating, and in particular to a kind of strong cooling system of LED drive power.
Background technology
It is well known that before LED illumination technology, illuminating frequently with incandescent lamp and fluorescent lamp, its brightness is low, energy loss
Greatly, most of energy is directly radiated away by infrared ray, and the heating of light source is few；And as LED, except as visible ray consumption
Energy, other energy all converted heat, because LED is subject to the little reason of package area, by convection current and the radiating of radiation
It is few, have accumulated substantial amounts of heat；Radiating effect for LED illumination it is critical that, because temperature can directly affect LED illumination
Quality and the life-span.LED radiatings are bad, and junction temperature is just high.Junction temperature directly results in the light decay of LED.According to A Leiniusi rules：Temperature
10 degrees Celsius are often reduced, LED life will extend 2 times；Driving power supply plays very crucial work to the aging effects of LED
With driving power supply is likely to become a bottlenecks of the marketing LED in lighting field.In general, LED normally uses the longevity
Life-span of the life far above driving power supply.For example LED chip was up to 5-10 ten thousand hours, and the ordinary life of driving power supply is about 2000
Hour, therefore the life length of LED lamp depends primarily on driving power supply；The work(of the power ratio common LED lamp of LED drive power
Rate is big, and the original paper of power source internal operationally produces very big heat.But, LED drive power needs to consider that waterproof, protection against the tide will
Ask, power pack shell is closing, it is impossible to radiated come the components and parts to power source internal by the form of louvre.In power supply
The components and parts in portion transfer heat to the air inside power pack by radiator, then by the side of air thermal convection current in power pack
Formula to the shell of power pack, then heat is distributed the heat transfer for producing by power pack shell.This air thermal convection current
Radiating mode be that radiating efficiency is low, easily cause high-power LED lamp driving power supply overheated and damage；According to related data
Show, the filter condenser in LED drive power should typically select the alminium electrolytic condenser of low ESR, work as aluminium electroloysis
The life-span is about 16000 hours during about 75 degrees Celsius of electric capacity operating temperature, is down to when 85 degrees Celsius 8000 hours, when 95 degrees Celsius only
Have 4000 hours, 2000 hours are about when 100 degrees Celsius；Due to the development of high-capacity LED technology so that LED lamp faces
The harsh challenge of heat management and heat dissipation design, can not only cause brightness to decline because temperature is raised, when temperature exceedes 100° centigrade
Shi Genghui accelerates the deterioration of light fitting body and encapsulating material.Therefore, in addition to the LED package assemblings heat dissipation technologys of itself, LED
The radiating of tool and heat conductive design even more maintain the maximum of lamp life crucial.
The content of the invention
It is an object of the invention to provide a kind of strong cooling system of the LED drive power for extending LED lamp tube service life, solution
One or more in certainly above-mentioned prior art problem.
To solve the above problems, the technical scheme is that：A kind of strong cooling system of LED drive power, its innovation
Put and be：Including heat-radiating substrate and the radiating circuit for being arranged on heat-radiating substrate and being connected with the wiring of LED drive power；
Radiating circuit includes
One realizes the light-operated circuit that LED is lighted or extinguished, and the circuit includes current limiting capacitance, the bridge rectifier being sequentially connected in series
Circuit and mu balanced circuit；
One LED drive power must constant-current drive circuit, the circuit based on MBI1802 chips and with each LED
Pipe is connected, the two ends of each LED lamp tube one Zener of parallel connection, and each LED lamp tube is connected a steady resistance；
One LED drive power temperature-compensating and light adjusting circuit figure；The circuit with AVR single chip and MBI1802 chips and
The adjustable range of the external resistor Rext of MBI1802 chips, resistor Rext is 0～360mA, the of MBI1802 chips
Seven pin connect AVR single chip；
One NCL30001 integrated chips, should be arranged on heat-radiating substrate on and with LED drive power in PFC and AC/DC connect
Connect；
One single- stage PFC reverse excitation circuit, the DRV pins output pwm signal of the circuit drives V1 conductings, single- stage PFC flyback
A switching tube and a set of control circuit are additionally provided with formula circuit.
The technical program takes into full account light-operated sensitivity in the design of light-operated circuit system, by alternating current 220V Jing
Capacitance current-limiting, bridge rectifier, filtering, voltage stabilizing, and after the 12V direct currents that A, B two ends obtain stable, it is considered to the change of light intensity
Change the impact to photo resistance, reach the closure of LED drive circuit for adjusting, realize effective control of LED " lighting " and " extinguishing "
System；LED drive power is considered the characteristics of high-power applications field must possess constant current and drive, technically using Zener diode
Stable driving voltage is provided to integrated chip, all LED are connected, it is ensured that the electric current per LEDs is all identical.And every
One Zener of individual LED two ends parallel connection, can provide open-circuit-protection for LED.To drive white light LEDs with parallel way, each is white
Light LED must connect a steady resistance, to avoid difference occur by its electric current, it is ensured that electric current it is constant；When LED it is all
Enclose temperature it is higher when, LED temperatures itself will be higher, the situation that the service life of LED/light source will be under some influence, technology
Upper employing circuit temperature compensation way, can precisely adjust the bright intensity of LED light, realize the dimming function of LED；Using constant current side
LED drive power under formula, in the raising and lowering of temperature, in the case of its electric current is possible to fluctuation, can directly affect LED
Luminous efficiency, luminosity, luminescent chromaticity.Technically employ a kind of integrated chip to drive great power LED, for it perseverance is provided
Fixed electric current, while reaching preferable luminous intensity.Temperature-compensating and brightness adjustment control are made full use of, perfect LED life can be improved,
The regulation of LED illuminance is realized, and compensation effect is clearly；In order to reach the design requirement of constant current driving, in drive circuit control
The selection aspect of coremaking piece, the integrated chip of employing can integrate PFC and AC/DC controls, and with soft technology is skipped,
It can reduce the noise in driving power supply in underloading, and can be effectively this with overvoltage, excessively stream and overheat protector function
The circuit design of bright scheme provides multi-ensuring；The single- stage PFC reverse excitation circuit work of designed LED constant current driving power supply is former
Reason, in circuit system, when Switching Power Supply access electric current bring into operation when, alternating current by it is a series of detection and identification after, energy
The operating frequency of effective control drive signal and each chip, carries out the slope-compensation of science.
In some embodiments, in LED lamp tube connect a switching tube and adopt NCS1002 controllers Vcc ends
It is connected with V3, and is input pwm signal port by CON2 ends.
Description of the drawings
Fig. 1 is the light-operated circuit design drawing of LED drive power system.
Fig. 2 is LED drive power light-operated circuit fundamental diagram.
Fig. 3 is the constant-current drive circuit of LED power.
Fig. 4 is LED drive power temperature-compensating and dimmer circuit design figure.
Fig. 5 is LED drive power constant current design sketch.
Fig. 6 is high-power constant current LED drive circuit frame construction drawing.
Fig. 7 is the single- stage PFC reverse excitation circuit structure of LED constant current driving power supply.
Fig. 8 is the light adjusting circuit structure diagram of high power LED constant.
Fig. 9 is that the curve of LED drive circuit output current, power factor and conversion efficiency under full voltage under type is illustrated
Figure.
Figure 10 is LED drive circuit output current, power factor and conversion efficiency curve schematic diagram under light adjusting circuit mode.
Figure 11 is that LED constant current drives PFC reverse excitation circuit fundamental diagrams.
Specific embodiment
With reference to Figure of description, the present invention is described in more detail.
As shown in figure 1, in the strong radiating circuit design of LED drive power, fully examining in the design of light-operated circuit system
Consider light-operated sensitivity, by alternating current 220V Jing capacitance current-limitings → bridge rectifier → filtering → voltage stabilizing, and obtain at A, B two ends
After stable 12V direct currents, daytime is subject to the irradiation of natural light that low resistance, the base stage electricity of triode VT is presented because of photo resistance RG
Position is low, and is reversely biased, therefore VT ends, and one-way SCR VS gate poles are turned off for low level, and LED drive circuit is not actuated,
All LED do not work；To photo resistance RG at dark because no light is presented high resistance, VT conductings, the gate pole of VS has positive triggering
Voltage and turn on, LED drive circuit starts, and LED electrified light emittings improve the sensitivity of LED drive power photocontrol；Work is former
Reason is as shown in Figure 2.
As shown in figure 3, in the strong radiating circuit design device of the LED drive power, it is considered to which LED drive power must be permanent
The characteristics of stream drives, can provide stable driving voltage, now by high-power by Zener diode D6 for MBI1802 chips
The electric current of LED is mainly determined by reference voltage level and MBI1802 chip operating voltages, all LED is connected, it is ensured that every
The electric current of LEDs is all identical；Meanwhile, in each one Zener of LED two ends parallel connection, open-circuit-protection can be provided for LED；To with
Parallel way drives white light LEDs, each white light LEDs to connect a steady resistance, poor to avoid occurring by its electric current
It is different, these resistance also can power consumption, reduce circuit efficiency.
As shown in figure 4, when LED peripheral temperatures are higher, LED temperatures itself will be higher, and the service life of LED/light source is just
Can be under some influence；By circuit temperature compensation way, for the driving current of LED the constant current not varied with temperature is designed as
Source, when LED environment temperatures are less than safe temperature point, export highest allowable current and keeps constant；When LED environment temperatures are higher than
During safe temperature point, just not in place of safety, the performance for causing LED is far below nominal to operating current by this；In the design
Drive circuit temperature compensation function is mainly adopted, and by AVR single chip and MBI1802 chips, is compensated by circuit temperature, energy
It is enough more accurately to adjust LED luminance；The operating voltage of AVR single chip and MBI1802 chips is adopted for 5V, by MBI1802
External resistor Rext, can adjust output current scope be 0～360mA, under specific illumination, as long as not surpassing
Cross the rated current of LED, can random output current, so can flexibly control the luminous intensity of LED；Meanwhile, MBI1802 chips
The 7th pin connection AVR single chip, the resistance of photo resistance RG for temperature being measured according to temperature sensor 18B20 and being detected
Value, AVR single chip realizes the temperature-compensating of LED by exporting PWM ripples to MBI1802 controlling its output current, while can be with
Accurate adjustment LED luminance, and then realize the dimming function of LED.
As shown in figure 5, realizing situation for the constant current effect of LED power, constant current effect is referred to and driven with current constant mode
LED, allows the electric current not temperature influence of LED drive power；When LED operation electric current can change according to temperature, when temperature rises,
Electric current also can be improved, but current constant mode drives and can be with stabling current, implementation step：If the driving of LED is provided without constant current
Source type of drive, then after forward conduction, junction voltage VF rises and declines PN junction semiconductor devices with environment temperature, i.e. ,-
2mV/ DEG C, the negative temperature effect of PN junction, the characteristic is claimed to directly affect its luminous efficiency, luminosity, luminescent chromaticity.For example when
During 30 DEG C of normal temperature, LED recommended currents are selected to be 135mA, when environment temperature is raised to 90 DEG C, junction voltage VF declines, work electricity
Stream drastically increases to 265～282mA.When temperature drop is to -40 DEG C, junction voltage VF rises, and recommended current will be from 135mA
27mA is reduced to, luminosity is also reduced with the reduction of electric current, does not reach required illumination.By diagram, when for high-power
When LED drive power provides the process of constant current, from MBI1802 chips, can help improve the service life of LED；Pass through
MBI1802 chips provide constant electric current, while reaching preferable luminous intensity driving great power LED for it.Using AVR
Single-chip microcomputer carries out temperature-compensating and brightness adjustment control, can improve LED life, realizes the regulation of LED illuminance, and compensation effect is very bright
It is aobvious.
As shown in fig. 6, using input AC90-260V voltages in light adjusting circuit, output voltage is 50V, electric current is
1.5A, nominal load is 75W, and LED drive power supports tunable optical design, can be used in driving that multiple 1W/0.35A's is big
Power White LED.Alternating current AC220V is allowed to enter high frequency transformer, the voltage x current of output end Jing after EMI filtering, rectifying and wave-filtering
Signal feeds back to DC/DC and pfc controller, and controller is opened according to front end input exchange signal and the control of rear end voltage and current signal
Pipe conducting shut-off is closed, so as to control the energy transmission of whole circuit.
In the strong radiating circuit design device of the LED drive power, using NCL30001 integrated chips, can be by PFC
With AC/DC control integrate, the integrated chip have it is soft skip technology, it can reduce making an uproar in driving power supply in underloading
Sound, and with overvoltage, excessively stream and overheat protector function, effectively multi-ensuring can be provided for the circuit design of the present invention program.
As shown in fig. 7, using the single- stage PFC reverse excitation circuit operation principle of LED constant current driving power supply, in this circuit system
In system, when the Switching Power Supply accesses electric current to bring into operation, alternating current is charged by VD1 to electric capacity C5；When the voltage of C5 reaches
After threshold voltage, chip is started working.VD2, C6, R7 constitute primary clamp protection circuits and absorb leakage inductance peak voltage, make drain electrode
Voltage is limited in safe range with protection switch pipe V1.After NCL30001 integrated chips are started working, its DRV pins output
Pwm signal drives V1 conductings.The voltage of Jing rectifier bridges is through transformer T1, armature winding of the energy storage in Tl after V1 conductings
In, now C9 is load supplying；When V1 is turned off, the energy transmission stored in Tl to secondary windings, be load supplying while
For C9 chargings；The size of C2 determines the operating frequency of chip, and R10 plays a part of to sense primary current.The chip operation exists
Continuous conduction mode CCM, arranging R5 carries out slope-compensation.
In the strong radiating circuit design device of LED drive power, for the consideration to cost, using single- stage PFC circuit system
Only using a switching tube and a set of control circuit in system, and need to realize output voltage quick regulation and input current it is whole
Shape, the energy imbalance between PFC levels and DC/DC levels is balanced by storage capacitor；As a rule, exactly want to single-stage
PFC is designed under electric current discontinuous mode DCM, to obtain higher power factor；But, in order to effectively improve whole electricity
The conversion efficiency in source, it is desirable to which DC/DC levels can work in ccm mode；Two kinds of different patterns cause to diminish once loading,
Input power is constant and power output reduces, and circuit has little time adjustment causes energy-storage travelling wave tube voltage instantaneous very high.In single- stage PFC
PFC levels can solve the problems, such as that storage capacitor voltage stress is too high with DC/DC levels using identical current working mode, and in right
The consideration of the loss of power and switching tube cost, therefore current working mode is set in enforcement under CCM states by us.
As shown in fig. 7, LED drive power is made that change as shown in Figure 8 in output end, i.e.,：In output end LED
One switching tube of series connection, by the turn-on and turn-off of controlling switch pipe average output current is changed in lamp string；Using NCS1002
The Vcc ends of controller are connected with V3, and are input pwm signal port by CON2 ends；The characteristics of this design and defect are very bright
Aobvious, when it is low level to be input into pwm signal, colelctor electrode and the emitter stage of triode V5 end, and the grid source both end voltage of V3 is
Vcc, about 14V, V3 is in the conduction state, LED normal luminous.And when input signal be high level when, the colelctor electrode of V5 with send out
Emitter-base bandgap grading is turned on, and the grid source both end voltage of V3 is pulled low, and V3 cut-offs, LED does not light；When being disconnected in view of output end, sampling electricity
Voltage is not produced in resistance, is the open-circuit condition of moment.In order to solve this defect, V4 and C12 has been especially added with；Circuit diagram detail
As shown in Figure 8：V3 and V4 are simultaneously turned on and turned off, and when V3, V4 are turned off, current constant control ring detects the voltage at C12 two ends, i.e.,
The voltage at R12 two ends, referred to as virtual voltage during normal work.And after it with the addition of V4 and C12, when PWM signal frequency it is enough
Gao Shi, the output end open circuit time is very short, and C12 is still not fully discharged, and current constant control ring is using C12 both end voltages as the electricity for detecting
Pressure, so that circuit keeps normal work.Due to virtual voltage, PWM light adjusting circuits now would not affect the constant current of circuit
Effect.
In the strong radiating circuit design of LED drive power, after light adjusting circuit and hardware design are completed, it is necessary to do whole
A part for most critical in individual LED power design, calculates the number of turn of power transformer and the design work of correlation.Due at this
In bright, the output rated power of designed circuit is 75W, therefore, select the magnetic core of transformer of model PQ3230.Table look-up to obtain it
Magnetic core area is 1.6 square centimeters, and the efficiency of driving power supply is 85%, and input minimum voltage 120V and maximum duty cycle are taken here
0.45, then the average current of primary is Iav=Po/ η Uinmin, is computed obtaining a result as 0.74A.
In the strong radiating circuit design of LED drive power, the primary average current value of power transformer is being drawn
Afterwards, peak primary currents Ipk for calculating LED drive power transformer are needed, in order to obtain accurate result of calculation, is now needed
Introduce primary current change quantity △ I, ratio K rp with Ipk.Due to LED power main circuit work in ccm mode, because
This takes Krp=0.7, then can draw formula for IgvT=(Ipk-IpkKrp+Ipk) ton/2, and T is the work period in formula, T=1/
∫, ton=TDmax.It is 2.53A to be calculated Ipk, and the inductance value and the number of turn of primary is further obtained.In formula, magnetic is taken
The value of flux density △ B is generally between 0.1～0.2T.By derivation and calculation to the formula, Lp=436 μ H, Np=are solved
33 circles.Again because of output voltage Uo=50V, fly-wheel diode pressure drop Uvo=1V.According to formula NS=(Uo+UVD) Np/Uinmin,
It is 14 circles to obtain number of secondary turns, can further obtain the assists winding number of turn for 5 circles.
As shown in figure 9, after to the hardware and circuit design of this kind of high-power constant current LED driving power source, needing to make model machine
And carry out prototype experiment.LED drive power first to not adding light adjusting circuit carries out experiment test.Experiment condition is input AC90
The alternating voltage of～260V, the LED string (i.e. the LED of 60 3.5V/0.35A) that load is 75W.Do not adding light modulation electricity
On the premise of road, when input ac voltage changes between 90～260V, the output of this constant current high-power LED driving power source
Curent change scope is 1.472～1.593A, and stability bandwidth is 8.16%.The power factor of drive circuit is very high always, keeps
More than 0.95.And when input voltage is less than 220V, with the rising of input voltage, the conversion efficiency of drive circuit is gradually carried
Height, reaches as high as 86%.When input voltage is higher than 220V, conversion efficiency is raised with voltage and is declined slightly.
As shown in Figure 10, model machine is increased into the light adjusting circuit designed by this programme on original drive circuit, in addition
While light adjusting circuit, pwm signal input CON2 ports are produced using n555 timer circuits, in the input voltage condition of 220V
Under, change the dutycycle of input pwm signal.Load is still the LED string of 75w.The master of this high-power constant current LED driving power source
With the reduction of PWM duty cycle in circuit system, output current also reduces, when dutycycle changes between 0.2～1, output electricity
The excursion of stream is 0.6～1.5A.When dutycycle is more than 3, the power factor of drive circuit is basically unchanged, and is maintained at 0.9
More than.When dutycycle is less than 0-3, power factor is decreased obviously, but is still maintained at more than 0.88.Conversion efficiency is with duty
The reduction of ratio and reduce, it is minimum to be down to about 50%.From LED drive power output current, power factor and conversion efficiency curve figure
Understand, the circuit-line structure after optimization, its effect is it is clear that very accurate in terms of solving sinking path and lifting the life-span
With it is clear and definite.
Compared with prior art, the device have the advantages that as follows：The strong radiating circuit of LED drive power of the present invention
In design device, using heat-radiating substrate, Zener in parallel, to overvoltage, excessively stream, overheated protect；LED drive power of the present invention
Strong radiating circuit design device in, using the temperature-compensating and its optimization of light adjusting circuit of LED drive power, intelligentized solution
The heat dissipation technology of LED drive power of having determined, improves radiating effect；The strong radiating circuit design dress of LED drive power of the present invention
In putting, the technical optimization carried out to the circuit of driving power supply solves the bottleneck of current LED drive power short life, improves
The longer service life of driving power supply, and the capacity of heat transmission and high-grade pressure is effectively lifted, complete heating position and radiating part
The quick heat transfer of position；In the strong radiating circuit design device of LED drive power of the present invention, the position that each part is arranged is reasonable,
Scientific arrangement, radiator structure and radiating mode it is easier, manufacturing cost is also very economical, it is easy to operation and realize, with very
Good market value.
The above is only the preferred embodiment of the present invention, it is noted that to those skilled in the art, not
On the premise of departing from the invention design, some similar deformations and improvement can also be made, these also should be regarded as the present invention
Protection domain within.
Claims (2)
1. the strong cooling system of a kind of LED drive power, it is characterised in that：Including heat-radiating substrate and it is arranged on heat-radiating substrate
And the radiating circuit being connected with the wiring of LED drive power；
The radiating circuit includes
One realizes the light-operated circuit that LED is lighted or extinguished, and the circuit includes current limiting capacitance, the bridge rectifier being sequentially connected in series
And mu balanced circuit；
One LED drive power must constant-current drive circuit, the circuit based on MBI1802 chips and with each LED lamp tube string
Connection, the two ends of each LED lamp tube one Zener of parallel connection, described each LED lamp tube is connected a steady resistance；
One LED drive power temperature-compensating and light adjusting circuit figure；The circuit with AVR single chip and MBI1802 chips and
The adjustable range of the external resistor Rext of MBI1802 chips, the resistor Rext is 0～360mA, the MBI1802
The 7th pin connection AVR single chip of chip；
One NCL30001 integrated chips, should be arranged on heat-radiating substrate and with PFC and AC/DC in LED drive power and be connected；
One single- stage PFC reverse excitation circuit, the DRV pins output pwm signal of the circuit drives V1 conductings, the single- stage PFC flyback
A switching tube and a set of control circuit are additionally provided with formula circuit.
2. the strong cooling system of a kind of LED drive power according to claim 1, it is characterised in that：In the LED lamp tube
One switching tube of middle series connection simultaneously adopts the Vcc ends of NCS1002 controllers to be connected with V3, and is input pwm signal end by CON2 ends
Mouthful.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610767513.4A CN106642033A (en) | 2016-08-30 | 2016-08-30 | Strong heat dissipation system of LED drive power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610767513.4A CN106642033A (en) | 2016-08-30 | 2016-08-30 | Strong heat dissipation system of LED drive power supply |
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| CN106642033A true CN106642033A (en) | 2017-05-10 |
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| CN201610767513.4A Pending CN106642033A (en) | 2016-08-30 | 2016-08-30 | Strong heat dissipation system of LED drive power supply |
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| Country | Link |
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| CN (1) | CN106642033A (en) |
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| WO2012119244A1 (en) * | 2011-03-07 | 2012-09-13 | Led Roadway Lighting Ltd. | Single stage power factor corrected flyback converter with constant current multi-channel output power supply for led applications |
| CN102695322A (en) * | 2011-03-24 | 2012-09-26 | 上海边光实业有限公司 | Driving power supply device for high power LED |
| CN103476168A (en) * | 2013-06-03 | 2013-12-25 | 南通天明光电科技有限公司 | Building LED intelligent lighting control system based on things of Internet |
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Application publication date: 20170510 |