CN103167691B - Light emitting diode (LED) driving power supply and dimming system - Google Patents

Light emitting diode (LED) driving power supply and dimming system Download PDF

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CN103167691B
CN103167691B CN201310068527.3A CN201310068527A CN103167691B CN 103167691 B CN103167691 B CN 103167691B CN 201310068527 A CN201310068527 A CN 201310068527A CN 103167691 B CN103167691 B CN 103167691B
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module
voltage
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CN103167691A (en
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沈艳霞
张君继
李帆
纪志成
吴定会
赵芝璞
潘庭龙
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Zhongshan Bao Sheng Photoelectric Technology Co., Ltd.
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Jiangnan University
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Abstract

The invention discloses a light emitting diode (LED) driving power supply and dimming system. The LED driving power supply and dimming system comprises an alternating current input rectifying filtering unit, a flyback conversion unit, an output filtering unit, a constant current output unit, a voltage feedback sampling unit, an optical coupling isolation unit, an STC 89C51 single chip microcomputer control module, a liquid crystal display module, a DS18B20 temperature measuring module, a buzzer warning module, an infrared sending module, an infrared receiving module and an auxiliary power supply module of a single chip microcomputer. The LED driving power supply and dimming system has the advantages of being high in efficiency, low in costs, convenient to control, simple in peripheral circuit and high in practicability.

Description

A kind of LED drive power and light adjusting system
Technical field
The present invention relates to a kind of LED drive power and light adjusting system, belong to electronic technology especially field of switch power.
Background technology
LED is the cold light source of new generation grown up the nineties in 20th century, there is the unrivaled advantage of conventional light source: such as conversion efficiency is high, caloric value is low (not having radiation), power consumption is little, the life-span reaches 100,000 hours, reaction speed fast (can high-frequency operation), environmental protection (shatter-proof, shock-resistant not easily broken, discarded object is recyclable, pollution-free), volume little (many, multiple combination), easy exploiting become thin short and small product, LED light source is called as the forth generation light source after incandescent lamp, fluorescent lamp and high-intensity-gas lamp.And along with the raising of people's living standard and the development of electronic technology, the intelligent requirements of people to illuminator is more and more higher.
Due to the semiconductor device that LED is responsive, have negative temperature characteristic again, its driving design just becomes very complicated, can not power by direct electric main as conventional illumination device.The performance of driver is directly connected to the luminous flux of LED, also affects the photoelectric conversion efficiency of lamp package, if driver is defective, then the advantage of LED can not embody completely.Can say, the effect of driving power in whole light fixture is important as heart.It also affects the life-span of LED illumination device in addition, and its high cost, also govern the large-scale application of LED in general lighting field, therefore its structure and automatically controlled integration are one of problem demanding prompt solutions.
The mode of LED light modulation on the market is mainly divided into linearity light adjusting, controllable silicon light modulation, PWM light modulation three kinds of modes at present.Linearity light adjusting is based on simple voltage divider principle, and application is simple, inefficiency; The operation principle of controllable silicon light modulation applies tangential principle, reduces the effective value of output voltage, reduce the power of normal load, be not suitable for being directly used in LED product with this.PWM light regulating technology is considered to the most promising LED light regulating technology at present, when carrying out pulse duration PWM light modulation, need to provide the pulse width adjustment signal source that extra, regulate the object by LED current size by the pulse signal duty ratio changing input, the advantage of this light regulating technology is that application is simple, efficiency is high, precision good, good dimming effect.
Single-chip microcomputer control technology is applied in Switching Power Supply, makes Switching Power Supply have stronger controllability, such as remote control light modulating, both solved the trouble of the switch on wall that gropes in the dark, solve again when room rearranges because brought worry is fixed in the position of the switch.Because infra-red remote control has, volume is little, low in energy consumption, function is strong, cost is low, has been current most widely used one communication and remote control means.
Summary of the invention
The present invention is poor mainly for common LED driving power man-machine interaction, and digital intellectualization degree is low, and the shortcoming that dimming mode is single designs a kind of energy-saving and environmental protection, easily LED drive power and light adjusting system; LED drive power designed by the present invention and light adjusting system, can carry out man-machine interactive operation, sets different brightness according to different environment or requirement; LED drive power designed by the present invention and light adjusting system, can produce two groups of PWM with Infrared remote controller control single chip computer and carry out light modulation to two LED; LED drive power designed by the present invention and light adjusting system, feedback circuit adopts three end off-line formula PWM switches, by the PWM controller in high frequency switch power and MOSFET power switch pipe on the same chip integrated, eliminate high frequency radiation phenomenon, improve the Electro Magnetic Compatibility of power supply, reduce the requirement of device to circuit-board laying-out and input bus transition; LED drive power designed by the present invention and light adjusting system, adopt TL431CLP chip to provide Precision reference voltage, have the features such as little, the low dynamic output impedance of Voltage Reference error, low output noise voltage; LED drive power designed by the present invention, adopt MAX16822 voltage-dropping type constant current high-brightness LED driver, output current detects resistance by a high side current and arranges, and the pulsed LED luminance that special PWM brightness regulation input can realize wide brightness range regulates; LED drive power designed by the present invention and light adjusting system, except the main output in road is powered to LED, also have two-way to assist output loop, a road assists output loop to power to optocoupler, and a road assists output loop to power to single-chip microcomputer; LED light adjusting system designed by the present invention, also has LCD MODULE, can show LED present intensity, temperature; LED light adjusting system designed by the present invention, also has temperature sampling module, is given the alarm when exceeding alarm value by buzzer.
According to technical scheme provided by the present invention, the design of described drive circuit, main circuit topological structure is inverse-excitation type switch power-supply topological structure, and circuit comprises: the auxiliary power module exchanging input rectifying filter unit, inverse-excitation converting unit, output filtering unit, constant current output unit, Voltage Feedback sampling unit, linear optical coupling isolated location, STC89C51 single chip control module, DS18B20 temperature measurement module, buzzer warning module, LCD MODULE, infrared output module, infrared receiving module, single-chip microcomputer; Described interchange input rectifying filter unit, inverse-excitation converting unit connect and constant current output end successively, and constant current output Duan Zhong mono-tunnel is that LED powers, and a road is that optocoupler is powered, and a road is that single chip control module is powered; The main output of LED by potential-divider network to voltage signal sampling after be input to TL431CLP reference edge (Vref) control the shunting of this device from negative electrode to anode, this electric current is again the luminous component of Direct driver optocoupler U3, so when output voltage has change main trend, Vref increases the electric current causing flowing through TL431CLP thereupon and increases, so optocoupler luminescence is strengthened, the feedback voltage that photosensitive end obtains is also larger, U2 is accepting will to change the switching time of MOSFET after this becomes large feedback voltage, and output voltage falls after rise with change; Single-chip microcomputer also has temperature collect module, and the temperature information of collection is shown in LCD LCD screen by single-chip microcomputer by temperature collect module; Can require that the PWM controlling to export different duty can control two LED brightness respectively according to user's difference by hand-held remote controller formula infrared transmission module, realize man-machine interaction.
Described one-chip computer module adopts STC89C51 single-chip microcomputer, has cost low, exploits natural resources abundant, the advantages such as bit addressing is convenient.And use single-chip microcomputer to carry out software decode and to export PWM, substantially increase the flexibility of circuit, reduce cost, only use one or two button just can realize switch to a LED and brightness regulation, practicality is very strong.
Described temperature measurement module adopts DS18B20 temperature sensor, DS18B20 only needs a line can realize the both-way communication of microprocessor and DS18B20 when adopting the interface mode of monobus to be connected with microprocessor, there is cost low, antijamming capability is strong, the advantages such as the scene temperature being suitable for adverse circumstances is measured, easy to use.When the LED temperature collected exceedes presetting value, the buzzer be connected with single-chip microcomputer gives the alarm, remind timely and maintenance test is carried out to power unit, extend the working life of LED and driving power thereof and reduce because LED damages the inconvenience brought to the Working Life of people.
Described human-computer interaction module adopts hand-held remote controller formula infrared transmission module and LCD LCD screen, and what realize between people and single-chip microcomputer is mutual.
Described infrared transmission module adopts utilization more extensive, decoding is relatively easy to the chip composition radiating circuit of uPD6121G chip emission code form, after reflector button is pressed, namely remote control mode is had to send, the key pressed is different, remote control coding is also different, and single-chip microcomputer can carry out remote control LED according to the PWM of the different coding generation different duty received.
Described infrared receiving module adopts integrative infrared receiver, that one integrates infrared receiver and amplifies, without any need for outward element, just can complete from infrared receiver to exporting the work with the signal of Transistor-Transistor Logic level signal compatibility, and volume is the same with common plastic packaging triode size, be suitable for various infra-red remote control and Infrared data transmission.
Described LED drive power and light adjusting system have three tunnels to export, and a road is that two LED modules in parallel are powered, and a road is that optocoupler is powered, and a road is that one-chip computer module is powered.
Described LED drive power and light adjusting system main circuit part adopt TOPSwitch series single-chip switching, enormously simplify the design of circuit, shorten the design cycle.
Described LED drive power and light adjusting system adopt MAX16822 voltage-dropping type constant-current LED driver, the pulsed LED luminance that special pulse-width modulation (PWM) input can realize wide region regulates, high side current detection and internal current arrange circuit and decrease outer member quantity, and ± the average output current of 3% precision can be provided, in load transient and PWM brightness regulation process, hysteresis control algolithm ensure that excellent input power suppresses and fast-response energy.
Described LED drive power and light adjusting system can be two LED illumination module for power supply in parallel, carry out PWM control respectively by single-chip microcomputer.
The invention has the beneficial effects as follows:
(1) described a kind of LED drive power and light adjusting system, cost is low, and it is convenient to control, and peripheral circuit is simple, simple and reliable.
(2) described a kind of LED drive power and light adjusting system, adopt single-ended flyback LED drive circuit, integrated chip makes circuit conversion efficiency high.
(3) described a kind of LED drive power and light adjusting system, adopt Infrared Remote Control LED, infrared emission part adopts the chip composition radiating circuit of uPD6121G chip emission code form, described infrared receiving module adopts integrative infrared receiver, integrate infrared receiver and amplify, man-machine interaction is simple and convenient, practical.
(4) described a kind of LED drive power and light adjusting system, adopt SMD STC89C51 single-chip microcomputer to be control core, intelligence degree is high, wherein temperature detecting module Real-Time Monitoring LED temperature, produces and report to the police in LED abnormality situation.
(5) described a kind of LED drive power and light adjusting system, can require LED remote control light modulating according to individual, dimming scope is wide, is applicable to multiple occasion.
Accompanying drawing explanation
Fig. 1 is LED drive power and light adjusting system overall structure block diagram.
Fig. 2 is LED drive power and light adjusting system main circuit.
Fig. 3 is LED drive power and light adjusting system feedback loop circuitry figure.
Fig. 4 is SMD main control chip STC89C51 minimum system figure.
Fig. 5 is liquid crystal diagram.
Fig. 6 is infrared transmission module circuit diagram.
Fig. 7 is infrared receiving module circuit diagram.
Fig. 8 is LED temperature sampling module circuit diagram.
Fig. 9 is buzzer warning module circuit diagram.
Figure 10 is infrared remote coding " 0 " and " 1 " schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
As shown in Figure 1, circuit of the present invention comprises: exchange input rectifying filter unit, inverse-excitation converting unit, output filtering unit, constant current output unit, Voltage Feedback sampling unit, linear optical coupling isolated location, STC89C51 single chip control module, temperature sampling module, buzzer warning module, LCD MODULE, infrared sending module, infrared receiving module; Described interchange input rectifying filter unit, inverse-excitation converting unit are connected to constant current output unit successively; Inverse-excitation converting unit has 3 tunnels to export, and a road is+52V voltage is LED supply power voltage, and a road is+12V voltage, and a road is+5V voltage is that one-chip computer module is powered; Constant current output unit has 2, drives two paths of LED lamp respectively; The reference edge (Vref) being input to TL431CLP after the main output of LED is sampled to voltage signal by potential-divider network controls the shunting of this device from negative electrode to anode, this electric current is again the luminous component of Direct driver optocoupler U2, so when output voltage has change main trend, Vref increases the electric current causing flowing through TL431CLP thereupon and increases, so optocoupler luminescence is strengthened, the feedback voltage that photosensitive end obtains is also larger.U2 is accepting will change switching time of MOSFET after this becomes large feedback voltage, and output voltage falls after rise with change, and then reaches and realize voltage stabilizing to the closed-loop control of voltage and export; And constant current output unit adopts MAX16822 voltage-dropping type constant current high-brightness LED driver, output current detects resistance by a high side current and arranges, and the pulsed LED luminance that special PWM brightness regulation input can realize wide brightness range regulates; LCD MODULE display LED present intensity and temperature; Infrared transmission module adopts hand-held remote controller to launch infrared coding to infrared receiving module; Infrared receiving module receives the infrared coding launched to carry out amplifying and modulating, and sends to single-chip microcomputer with the form of external interrupt; By controlling two LED by the PWM of timer 1 and timer 2 generation duty ratio corresponding after software decode after single-chip microcomputer receives different infrared codings.
As shown in Figure 2, in main circuit, 165V ~ 265V alternating current accesses single-phase rectification bridge after overcurrent fuse F1 and piezo-resistance RZ1, EMI unit (electromagnetic interference suppression unit).Wherein, EMI unit, comprise CX2, L3 and CX1, on the live wire that L3 is become to be connected on primary input loop respectively by two inductive bank and zero line, filter capacitor C7 is met after single-phase rectification bridge, an input of electric capacity C7 mono-termination rectifier bridge, other one end of another termination rectifier bridge ground connection (GND1).Circuit is wiring voltage detection resistances R6 after filtering, the line voltage sense pin (L) of another termination TOP246Y chip of R6.RCD buffer circuit is connect after R6, wherein RCD buffer circuit is made up of R3, C3, D3, CY1, receives the negative electrode of D3 after R3 and C3 parallel connection, and the anode of D3 receives the drain lead (D) of TOP246Y chip, 1 pin of CY1 mono-termination transformer T1,8 pin of a termination T1.1 pin of the upper end of RCD and the upper termination transformer T1 of R3.4 pin of T1 and 5 pin form a road and assist winding, and 5 pin of T1 export the voltage of a road+12V after D5, C13 rectification, filtering.The secondary of T1 has 7,8,9,10 4 pins, and the winding that wherein 7 pins and 8 pins are formed is main output circuit winding is that LED is powered, and exports the voltage of+52V.The parallel network that 7 pins and R1, C1, D2 of T1 form is connected, and this network is connected afterwards by R1 and C1 and D2 composes in parallel, and the anode of D2 is connected with 7 pins of T1.The negative electrode of D2 connects the positive pole of polar capacitor C4, and the negative pole of C4 receives 8 pin of T1.The positive pole of C4 is then connected an inductance L 1, then a polar capacitor C5 and electric capacity C6 in parallel again in main output circuit, and wherein the positive pole of C5 is connected with the L1 other end, the minus earth (GND2) of C5.C6 mono-end receives the positive pole of C5, other end ground connection (GND2).It is that single-chip microcomputer is powered that the winding of 9 pin of transformer T1 and 10 pin composition produces+5V voltage.9 pin of T1 receive the positive pole of C10 after connecting with the anode of D4, simultaneously the negative pole of C10 and 10 pin of T1 receive (GND2).The negative electrode of D4 is received together with receiving with DZ1 afterwards in one end of C9, simultaneously the anode of DZ1 be connected with the other end of C9 and receive (GND2).The outside ductility limit pin (X) of TOP246Y receives one end of resistance R13, the other end ground connection (GND1) of R13.The frequency pin (F) of TOP246Y and source lead (S) ground connection (GND1) simultaneously.The control pin (C) that feedback signal receives TOP246Y and the parallel network be made up of R11, C15, C16, this parallel network is connected afterwards by R11 and C16 and C15 is formed in parallel, feedback signal receives one end of R11, the R11 other end receives the positive pole of C16, negative pole ground connection (GND1) together with the C15 other end of C16.+ 52V the voltage that main output circuit produces is connected to one end of inspection leakage resistance R2, and the R2 other end receives No. 1 pin of first MAX16822 (U1), receives the anode of first LED simultaneously.The voltage of+52V receives the negative electrode of D1, and the anode of D1 receives 5, No. 6 pins of U1.The negative terminal of first LED is connected to after 5, No. 6 pins of U1 also receive an inductance L 2.The voltage of+52V receives No. 2 pins of U1.No. 2 pins of U1 by being connected to 3, No. 4 pins after electric capacity C8, simultaneously by 3, No. 4 pin ground connection (GND2).No. 7 pins of U1 input one group of PWM from single-chip microcomputer.No. 8 pins of U1 receive one end of C2 and R4 simultaneously, the other end ground connection (GND2) of C2 and R4.The voltage of+52V receives the negative pole of D6 and No. 2 pins of second MAX16822 (U5).The anode of D6 receives 5, No. 6 pins of U5.5, No. 6 pins of U5 also receive the negative terminal that an inductance L 4 is connected to second LED.+ 52V the voltage that main output circuit produces is connected to one end of inspection leakage resistance R9, and the R9 other end receives No. 1 pin of U5, receives the anode of second LED simultaneously.No. 2 pins of U5 by receiving 3, No. 4 pins after electric capacity C17, simultaneously by 3, No. 4 pin ground connection (GND2).No. 7 pins of U5 input another group PWM from single-chip microcomputer.No. 8 pins of U5 receive one end of C12, R12 simultaneously, the other end ground connection (GND2) of C12 and R12.
As shown in Figure 3, the main output feedack loop of LED forms primarily of TL431CLP, optocoupler PC817A and accessory circuit thereof.From main circuit, obtain+52V reference voltage, the voltage on R14 is delivered to the reference edge of TL431CLP after R8 and R14 dividing potential drop.The reference edge of TL431CLP also receives one end of electric capacity C14, and the C14 other end receives one end of R10 and C11.The other end of R10 and C11 receives the negative electrode of TL431CLP.The plus earth (GND2) of TL431CLP.The negative electrode of TL431CLP also receives the negative electrode of the Light-Emitting Diode of photoelectrical coupler U3.To sample+52V the voltage obtained from main circuit C4 anode, after resistance R5, receive the anode of the Light-Emitting Diode of photoelectrical coupler U3.Resistance R7 is also connected between the negative electrode of the Light-Emitting Diode of photoelectrical coupler U3 and anode.The photistor collector electrode of U3 is connected on+12V power supply, emitter output feedback signal.
As shown in Figure 4, the minimum system of STC89C51 single-chip microcomputer is made up of power unit, reset circuit and crystal oscillating circuit.Wherein the power circuit of 5V is produced by main circuit.The power supply of reset circuit 5V receives switch S 2 one end, and switch S 2 other end is by ground connection after resistance R21.The anode of electric capacity C21 receives No. 4 pins and the 5V power supply of single-chip microcomputer simultaneously.No. 38 pins of single-chip microcomputer receive 5V power supply.16, No. 17 pin ground connection (GND2) of single-chip microcomputer.14, No. 15 pins of single-chip microcomputer receive the two ends of crystal oscillator Y1 respectively, and one end of electric capacity C21 and C22 is also received at Y1 two ends respectively simultaneously, the other end ground connection (GND2) of C1 and C2, form crystal oscillator module.
As shown in Figure 5, STC89C51 liquid crystal display circuit is primarily of 12864 liquid crystal and accessory circuit composition thereof.1, No. 20 pin ground connection (GND2) of 12864 liquid crystal.No. 2 pins connect 5V power supply and a 2K Ω slide rheostat one end, slide rheostat other end ground connection (GND2).No. 3 pins connect the slide plate of slide rheostat.No. 4 pins connect No. 11 pins of single-chip microcomputer.No. 5 pins connect No. 12 pins of single-chip microcomputer.No. 6 pins connect No. 10 pins of single-chip microcomputer.7,8,9,10,11,12,13, No. 14 pins of 12864 liquid crystal connect 37,36,35,34,33,32,31,30 pins of single-chip microcomputer respectively.No. 15 pins of 12864 liquid crystal connect No. 13 pins of single-chip microcomputer.16, No. 18 pins of 12864 liquid crystal are unsettled.17, No. 19 pins of 12864 liquid crystal connect 5V power supply.No. 1 pin of exclusion P2 connects 5V power supply.2,3,4,5,6,7,8,9 of P2 receives 37,36,35,34,33,32,31,30 pins of single-chip microcomputer respectively.
Infrared transmission module is primarily of uPD6121G chip and auxiliary circuit composition hand-held remote controller form thereof as shown in Figure 6.Remote controller adopts the button cell of 3V to power, and the VDD pin of uPD6121G connects 3V power supply, receives the positive pole of electric capacity C18 simultaneously, the minus earth of C18.The OSCI pin of uPD6121G and the indirect crystal oscillator Y2 of OSCO pin, simultaneously Y2 two ends connect ground connection after electric capacity C19 and C20 respectively.The SEL pin of uPD6121G receives 3V power supply.The LMP pin of uPD6121G receives the negative electrode of light-emitting diode, receives 3V power supply after the anode of light-emitting diode receives resistance R18.The VSS pin ground connection of uPD6121G.The REM pin of uPD6121G receives the base stage of Q1, and the negative electrode of infraluminescence diode received by the collector electrode of Q1, and the anode of infraluminescence diode receives 3V power supply, and the emitter of Q1 receives R20 one end, the other end ground connection of R20.The coding that the matrix keyboard of the KI pin of uPD6121G and KI/O pin composition 4 × 8 is corresponding different.The CCS pin of uPD6121G receives the negative electrode of D7 and D8, and the anode of D7 and D8 receives No. 0 pin and No. 3 pin of KI/O pin respectively.No. 7 pin of KI/O pin receive one end of R19, and the R19 other end receives 3V power supply.
Infrared receiving module is primarily of 1838 integrated infrared receiving terminals and auxiliary circuit composition thereof as shown in Figure 7.No. 1 pin of 1838 receives No. 8 pin P3.2 mouths of single-chip microcomputer, No. 2 pin ground connection (GND2).5V power supply receives R25 one end, and the R2 other end receives one end of C23, receives No. 3 pin of 1838 simultaneously, the other end ground connection (GND2) of C23.
Temperature collect module is primarily of DS18B20 and auxiliary circuit composition thereof as shown in Figure 8.The 1 pin ground connection (GND2) of DS18B20, be connected to resistance R22 between 2 pin and 3 pin, 3 pin of DS18B20 connect 5V voltage, and then 2 pin of DS18B20 are connected on single-chip microcomputer No. 12 pin P2.4 mouths.
Buzzer warning module is primarily of buzzer BZ1 and warning circuit composition thereof as shown in Figure 9.Single-chip microcomputer No. 13 pin P2.3 mouths are by receiving the base stage of triode Q5 after R23.5V voltage receives the emitter of Q5, and BZ1 one end received by the collector electrode of Q5, and the BZ1 other end is by ground connection (GND2) after R24.
" 0 " and " 1 " of the remote control coding of infrared transmission module as shown in Figure 10.Infrared transmission module comprises keyboard matrix, coded modulation, LED infrared transmitter.We select more extensive, decoding is relatively easy to uPD6121G chip composition radiating circuit, after reflector button is pressed, namely remote control mode is had to send, the key pressed is different, remote control coding is also different, and the combination that the serial code of this remote control mode employing pulse-width modulation take pulsewidth as 0.565ms, interval 0.56ms, the cycle is 1.125ms represents binary " 0 "; Take pulsewidth as 0.565ms, interval 1.685ms, the cycle is 2.25ms combination represents binary " 1 ".

Claims (8)

1. LED drive power and a light adjusting system, its feature comprises: the auxiliary power module exchanging input rectifying filter unit, inverse-excitation converting unit, output filtering unit, constant current output unit, Voltage Feedback sampling unit, light-coupled isolation unit, STC89C51 single chip control module, LCD MODULE, temperature sampling module, buzzer warning module, infrared sending module, infrared receiving module, single-chip microcomputer, AC-input voltage is after rectification filtering unit rectifying and wave-filtering, be connected to inverse-excitation converting unit, inverse-excitation converting unit produces+12V ,+5V ,+52V voltage, and+52V the voltage of generation is after LC filtering, receive constant current output unit, current source loads two LED of constant current output unit, the reference edge Vref being input to feedback sample unit at the main output of LED power after potential-divider network is sampled to voltage signal controls the shunting of feedback sample unit from negative electrode to anode, this electric current is again the luminous component of Direct driver light-coupled isolation unit, so when output voltage has change main trend, Vref increases the electric current causing flowing through TL431CLP thereupon and increases, so optocoupler luminescence is strengthened, the feedback voltage that photosensitive end obtains is also larger, TOP246Y is accepting will to change the switching time of MOSFET after this becomes large feedback voltage, output voltage falls after rise with change, infrared transmission module is used for producing the signal of regular coding to infrared receiving module, STC89C51 single chip control module is decoded to the information that infrared receiving module receives, according to the different coding that infrared sending module sends, the PWM ripple that single-chip microcomputer produces two groups of duty ratios adjustable by two timers of inside is sent to the brightness that constant current output module regulates LED, temperature sampling module adopts DS18B20 to LED temperature sampling, exceeds alarm value and then reports to the police, LCD MODULE is used for display two LED ambient humidity, light and temperatures.
2. a kind of LED drive power and light adjusting system as claimed in claim 1, it is characterized in that: described inverse-excitation converting unit adopts single-end flyback switching power supply circuit, the simple efficiency of circuit is high, be applicable to the power supply requiring many group direct voltage outputs, namely use same magnetic circuit effectively to provide by single input power and organize direct-flow steady voltage more.
3. a kind of LED drive power and light adjusting system as claimed in claim 1, it is characterized in that: described Voltage Feedback sampling unit adopts the luminous component of TL431CLP Direct driver optocoupler U2, so when output voltage has change main trend, TL431CLP reference edge Vref voltage increases the electric current causing flowing through TL431CLP thereupon and increases, so optocoupler luminescence is strengthened, the feedback voltage that photosensitive end obtains is also larger, TOP246Y is accepting will to change the switching time of MOSFET after this becomes large feedback voltage, and output voltage falls after rise with change.
4. a kind of LED drive power and light adjusting system as claimed in claim 1, it is characterized in that: described constant current output unit adopts MAX16822 chip composition constant-current drive circuit, MAX16822 is voltage-dropping type constant current high-brightness LED driver, output current detects resistance by a high side current and arranges, the pulsed LED luminance that special PWM brightness regulation input can realize wide brightness range regulates, regulate by realizing LED luminance at DIM pin input pwm signal, the output of MAX16822 is forced to drag down by the DIM input lower than 0.6V logic level, thus closedown LED current, if must LED current be opened, logic level on DIM must higher than 2.8V.
5. a kind of LED drive power and light adjusting system as claimed in claim 1, it is characterized in that: described single chip control module adopts STC89C51 single-chip microcomputer to produce PWM and regulates LED luminance, use single-chip microcomputer to carry out software decode, with output PWM, there is low complex degree, low cost, the simple feature of control.
6. a kind of LED drive power and light adjusting system as claimed in claim 1, it is characterized in that: described infrared transmission module adopts the duty cycle adjustment LED luminance of Infrared remote controller control PWM, infrared remote control is convenient to miniaturization, cost is low, code modulating method is simple, low in energy consumption, not easily cause signal cross-talk, described system adopts infrared remote control mode, in conjunction with LED light source, and brightness can be regulated arbitrarily within the specific limits, not only convenient but also energy-conservation.
7. a kind of LED drive power and light adjusting system as claimed in claim 1, it is characterized in that: described single chip control module adopts the timer 1 of STC89C51 single-chip microcomputer and timer 2 to produce the adjustable PWM of two groups of duty ratios, control two LED respectively, it is convenient, simple and reliable to control.
8. a kind of LED drive power and light adjusting system as claimed in claim 1, is characterized in that: the temperature of described temperature sampling module to LED is sampled, if exceeded alarm value, then buzzer gives the alarm.
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CN104519610B (en) * 2013-09-26 2019-03-26 深圳市海洋王照明工程有限公司 A kind of wireless temperature measurement circuit and LED illumination device
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