CN105188184A - Novel LED light source power driver - Google Patents
Novel LED light source power driver Download PDFInfo
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- CN105188184A CN105188184A CN201510345362.9A CN201510345362A CN105188184A CN 105188184 A CN105188184 A CN 105188184A CN 201510345362 A CN201510345362 A CN 201510345362A CN 105188184 A CN105188184 A CN 105188184A
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- microprocessor
- light source
- led light
- time
- power supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The technology of the invention relates to a power driver, and especially relates to a novel LED light source driver. A temperature sensor and a microprocessor are adopted to intelligently control the working temperature of an LED light source module. An illumination sensor is adopted to detect the ambient illumination, and an optimal PWM value is given through a special algorithm of the microprocessor to adjust the current of the LED light source module in order to achieve the purpose of brightness adjusting. A time control unit is connected to the microprocessor to provide real-time time and calendar information for the system and process the lamp turning-on/off time in different seasons and at different times. Over-current protection is a power load protection function to avoid damage of over-load output current to a power source and a load, including short circuit on an output terminal.
Description
Technical field
The technology of the present invention relates to power supply driver, is related specifically to a kind of Novel LED light source driver.
Background technology.
LED industry obtains the development of advancing by leaps and bounds recently in the whole world, development LED illumination has become the focus of global industry, and compared with other light source, the LED of high brightness has different characteristics and demand, therefore proposes new challenge for power supply.Power supply affects LED light source reliability and an adaptive important component part, it is the key point of LED light device, LED power and drive circuit, certain exporting for the forward current close to constant current needed for LED should be had, there is higher conversion efficiency again, electric light transformation efficiency is a key factor of semiconductor lighting, otherwise the advantage that LED is energy-conservation will be lost, current its efficiency of business-like LED power is about about 85%, as LED illumination power supply, its conversion efficiency still must promote further.
When we make lighting with LED, not not just with single LED, but become array place in circuit with even more LED multiple, up to a hundred, difference because of LED always has one to damage at first, when there being several breaking down (normally short circuit), electric current can being made to increase and damage other LED.The result of Here it is inconsistency band is also one of factor of its development of restriction.Driving voltage due to each LED has some difference, thus avoid LED electrical pressure uneven be a very important design.
The problem of drive circuit complexity:
A, in voltage matches, LED does not resemble common incandescent lamp bulb, directly can connect the electric main of 220V.LED is the low voltage drive of 2--3. volt, and must design complicated translation circuit, the LED of different purposes, be equipped with different power supplys.
B, in electric current supply side, the running current of LED is at 18mA-20mA, when supply current is less than 15mA, the luminous intensity of LED is inadequate, and when being greater than 20mA, there is light decay and cause LED aging, heating simultaneously increases, aging quickening, the lost of life, when damaging very soon more than during 50mA, in order to extend the useful life of LED illumination lamp, conventional ic power, electronic transformer, resolution element power supply etc., during large driven current density, join high power valve or silicon-controlled device, separately add protective circuit, want constant current, constant voltage circuit is powered, such power circuit is complicated, failure rate, element cost, production cost, cost of serving all will raise.This just strongly limit competitiveness and the purchasing group in market.
Contemporary society, city LED illumination has become shows the business card of Urban charm and window, but illumination is bringing splendidness, gorgeous and simultaneously easily, also encounters many unforeseeable problems, as: cost issues, electrical problem, problem of management, fault report problems etc.How to solve above problem? adopt LED illumination power supply remote control administrative system can realize needing the LED lamp of the occasion of long-time illumination to control to highway, square, station terminal, tunnel etc., the switch of Long-distance Control LED lamp, the operating state of detection LED tool, thus realize the management of high efficiency, low cost, but general LED power is not accomplished.
Summary of the invention
Technical problem to be solved by this invention overcomes above-mentioned the deficiencies in the prior art, provides a kind of Novel LED light source driver.
In order to solve the problems of the technologies described above; Novel LED light source driver of the present invention, is characterized in that: it comprises protective circuit 1, switching circuit 2, DC/DC power supply 3, V/I sample circuit 4, protection switch 5, LED light source module 6, power conversion unit 7, time control unit 8, microprocessor 9, temperature sensor 10, illuminance transducer 11, JATG interface 12, EEPROM unit 13 and Power Supply Monitoring/reset circuit 14 and forms.
The direct voltage of alternating current input power supplying after AC/DC conversion sends into protective circuit 1; switching circuit 2 input signal carrys out the output of self-protection circuit 1; the output signal of switching circuit 2 sends into DC/DC power supply 3; V/I sample circuit 4 is sent in the output of DC/DC power supply 3; protection switch 5 is sent in the output of V/I sample circuit 4, and protection switch 5 outputs to LED light source module 6.
The direct voltage of alternating current input power supplying after AC/DC conversion sends into power conversion unit 7, exports 2 groups of different voltages respectively and be used as operating voltage to correlation unit circuit after power conversion unit 7 processes.
The signal of telecommunication, temperature signal and light signal that protection switch 5, temperature sensor 10, illuminance transducer 11 collect send into microprocessor 9 respectively.
Microprocessor 9 outputs a control signal to switching circuit 2, controls it and opens and closes action; Microprocessor 9 output pwm signal is to DC/DC power supply 3, and control DC/DC power supply 3 exports size.
Microprocessor 9 carries out two-way communication with JATG interface 12, EEPROM unit 13 and Power Supply Monitoring/reset circuit 14 respectively.
Beneficial effect of the present invention:
1, adopt temperature sensor and microprocessor, intelligent control LED light source module working temperature, extend LED light source module useful life.
2, have employed the detection of OE9658F illuminance transducer as ambient light illumination, the ADC mouth of PIC18F6493 microprocessor will be delivered to after illumination intensity signal process, a best PWM value is provided, in order to regulate the electric current of LED light source module to reach the object regulating brightness by the particular algorithm of microprocessor.
3, time control unit is connected to microprocessor, and for system provides real-time time calendar information, the calendar that time control unit provides by microprocessor, time and the switch lamp time to Various Seasonal and Different periods are analyzed, calculate, process, judge.During actual motion, first microprocessor detects the parameter of light sensor, and then edition with parallel text aspect answers the switch lamp time of period, if eligible, performs-light modulation of turning on light.
4, overcurrent protection is a kind of power source loads defencive function, with the damage of the overload output current avoiding comprising the short circuit on lead-out terminal to power supply and load.When electric current is greater than limit value time, use relay normally-closed contact to disconnect and protect.With the adhesive of the normally-open normally-close of Microprocessor S3C44B0X relay, realize the function of automatic restoring circuit work.
Accompanying drawing explanation
Fig. 1: the general frame of the present invention;
Fig. 2: intelligent temperature control block diagram of the present invention;
Fig. 3: intelligent dimming of the present invention (brightness) control block diagram;
Fig. 4: PWM control software design flow chart software flow pattern;
Fig. 5: electric current, voltage sampling circuit;
Fig. 6: energy-saving run sequential ladder diagram;
Fig. 7: night program energy-saving run software flow;
Fig. 8: brightness working procedure;
Fig. 9: jtag interface;
Figure 10:
tPO manages block diagram;
figure 11upgrading main program flow chart;
Figure 12: upgrading subroutine flow chart;
Embodiment
Fig. 1 breaker in middle circuit 1 receives the signal 9 from microprocessor, is used to open or close power supply.Visible light sensor have employed the detection of OE9658F illuminance transducer 11 as ambient light illumination, OE9658F illuminance transducer 11 is photoelectric integrated sensors, typical case's incident wavelength is λ p=520nm, built-in visible ray is by ending optical grade filter, photoelectricity sensitive unit receiver with near infrared ray, visible-range inner height is responsive, and output current linearly changes with illumination.Natural light illumination level when turning on light according to " CJJ45-2006J627--2006 Lighting Design of Urban Road standard " road lighting is preferably 15lx; Natural light illumination level when turning off the light, through street and trunk roads are preferably 30lx, and secondary distributor road and branch road are preferably 20lx.OE9658F illuminance transducer 11 will deliver to the ADC mouth of PIC18F6493 microprocessor 9 after illumination intensity signal process, microprocessor exports a signal to switching circuit 2 after carrying out calculation process, and switching circuit is according to microprocessor 9 instruction unpack or close LED module 6.At closedown LED module 6 simultaneously, microprocessor 9 sends instruction makes DC/DC power subsystem 3 be in low-power consumption standby state, and microprocessor 9 is also in low power consumpting state simultaneously.
In Fig. 1 the general frame, 7 is power conversion unit XB1085, and input power is transformed to 3.3VDC and is supplied to microprocessor 9, OE9658F illuminance transducer 11, DS18B20 temperature sensor 10, Power Supply Monitoring/reset unit 14, AT24C512BEEPROM chip 13 by first piece of XB1085 chip; Input power is transformed to 5.0VDC and is supplied to time control unit 8 by the 2nd XB1085 chip 7; 3rd with LM7812 be protective circuit 1, switching circuit 2, protection switch 5 provide 12CDC.
In Fig. 1 the general frame, 14 is that Power Supply Monitoring/reset unit adopts CAT1832 microprocessor monitors device, and it can make the microprocessor of " hang-up " or " shutdown " suspend and restart, and microprocessor can also be made to restart after power-fail.
In Fig. 1 the general frame, EEPROM adopts AT24C512B chip, capacity 512KB; Interface I
2c.In order to deposit sensing data, system configuration information, LED illumination lamp data etc., in order to avoid the impact that these information resets by system accidentalia, elite nonvolatile external memory of selecting is to deposit these special datas.
In Fig. 1 the general frame, 5 is protection switch, and it is synchronous with protective circuit 1 action.
In Fig. 1 the general frame, 12 is jtag interfaces, and be responsible for on-line debugging and download program, interface schema is shown in Fig. 9.
The DS12887 the clip of real-time clock that in Fig. 1, time control unit 8 adopts DALLAS company to produce, the non-volatile static RAM (SRAM) of calendar clock, alarm, permanent calender, programmable Interrupt, square-wave generator and 114 bytes when its major function comprises non-volatile., under powering-off state, clock continues to run, and data wherein can be preserved and can not be lost for more than 10 years.
Fig. 2 is intelligent temperature control block diagram of the present invention, in figure, temperature detection adopts DS18B20 digital temperature sensor, DS18B20 digital temperature sensor is placed on LED illumination lamp group substrate, temperature signal is sent to the ADC mouth of PIC18F6493 microprocessor by DS18B20 digital temperature sensor, compare with the set point in microprocessor program, when the temperature value gathered is greater than set point, microprocessor sends instruction, reduce the operating current that constant-current source outputs to LED illumination lamp group, when the temperature value gathered is less than set point, microprocessor sends instruction, increase the operating current that constant-current source outputs to LED illumination lamp group.Be correlated with provision regulation aluminum base circuit board temperature according to China's first LED street lamp provincial standard must not more than 71 DEG C, inner maximum temperature is not more than 50 DEG C of requirements, can bear at 120 DEG C see general great power LED specifications junction temperature simultaneously, chip is to the thermal resistance of aluminium base, specifications generally recommend 10-15 DEG C, and that LED-baseplate will ensure at 120-15=105 DEG C.So, retain the temperature difference and get 50--105 DEG C of median 77.5 DEG C, general electronic devices and components working temperature is reliable at 85 DEG C, and 77 DEG C meet this principle.The present invention sets 50 DEG C and starts starting protection, and significantly lower electric current before 71 DEG C, 80 DEG C thoroughly complete product temperature defencive function.
Fig. 3 is intelligent dimming of the present invention (brightness) control block diagram, the present invention adopts OE9658F illuminance transducer 11 linearly to change with illumination according to sky brightness change output current, the electric current of this change monitored at any time by PIC18F6493 microprocessor, calculated by software and control output pwm signal, non-pole light regulating is carried out to LED module, illuminating lamp input electric power and actual illumination requirement is made to reach optimum Match, not only save electric energy, and stabilize voltage, extend the useful life of illuminating lamp, what reach on double meaning is energy-conservation.
Fig. 4 is PWM control software design flow chart software flow pattern;
Fig. 5 is electric current, voltage sampling circuit, and sampling resistor R61 adopts the high-power manganese-copper filament resistance that temperature drift coefficient is low, precision is 1%, and resistance size is determined as the case may be.After difference is carried out to sampling resistor two end signal, the magnitude of voltage U at sampling resistor two ends can be obtained, and in known sampling resistor resistance situation, be easy to the electric current obtaining flowing through sampling resistor, i.e. I=U/R.Because load and sampling resistor are at same branch road, therefore the electric current flowing through load is also I.The multiplication factor of differential amplifier circuit can be selected according to the reference voltage of sampling resistor resistance and ADC, and in Fig. 5, multiplication factor is R62/R61.It should be noted that this circuit should have very high input impedance, to reduce the impact on load circuit.Differential signal is sent into microprocessor ADC mouth and is processed by microprocessor after operational amplifier process.Differential signal (the V/I signal of output) and reference voltage compare by microprocessor, export a pwm signal by program, and the G pole controlling voltage-controlled constant flow element reaches the size changing and export, and control constant flow element adopts high-power FET.
Overcurrent protection is a kind of power source loads defencive function, with the damage of the overload output current avoiding comprising the short circuit on lead-out terminal to power supply and load.Microprocessor is monitored at any time and is exported V/I parameter; when V/I value is greater than limit value time; microprocessor exports a control signal and makes relay; use relay contact to disconnect to protect; with the conversion adhesive of the normally-open normally-close contact of Microprocessor S3C44B0X relay, thus realize the function of automatic restoring circuit work.During DC/DC power cut-off, LED illumination lamp module still can be connected by DC/DC power circuit, even if power supply lost efficacy like this, also can continue generation Small leak electric current, greatly shorten the life-span of LED.LED illumination lamp module disconnects also very important when PWM light modulation, in PWM idle period of time, although DC/DC power supply lost efficacy, but DC/DC power supply exports and is still connected with LED illumination lamp module, capacitor in DC/DC power supply output loop can be discharged by LED, until pwm pulse opening power again.For more perfect is protected LED, the present invention is added with protection switch 5 between LED illumination lamp module and V/I are sampled, and it is synchronous with protective circuit 1 action.
Fig. 9 is jtag interface, is mainly used in chip internal test.The high-grade device of present majority all supports JTAG agreement, as DSP, FPGA device etc.The jtag interface of standard is 4 lines: TMS, TCK, TDI, TDO, is respectively model selection, clock, data input and DOL Data Output Line.
Figure 10 is
tPO manages block diagram,the present invention adopts intelligent light source step-down one voltage stabilizing one light regulating technology to be all-digital intelligent illuminating lamp energy-conserving control technology popular in the world.It has taken into full account the actual state of city illumination, according to the theories of vision in ergonomics, adopts the method for optimally controlling in Comtemporary Control Theory, and the characteristic of foundation LED component, achieve the dynamic and intelligentization management to lighting modulating voltage and illumination, namely
tPO manages[TIME (time)/PLACE (place)/OCCASION (occasion)], the basic ideas of technique refer to Figure 10
.
The present invention not only has smart brightness controlling functions, also has multi-period energy-saving run time control function.
(1) run by the natural law: select this operational mode, system will calculate the correct time of switch lamp every day automatically by the time graph (spring, summer, autumn and winter seasonal variations) of local sunrise sunset rule throughout the year.
(2) run by every daily planning: select this operational mode, need user first to formulate day production plan, then system will rerun according to this plan every day.If want to change operating scheme, can modify to day production plan.
(3) run by real-time command: select this operational mode, user can input an order at any time, and after confirmation, system will perform immediately.Interval between system requirements two order was not less than for 10 seconds, and interval stage will reject next.
Above operational mode by microprocessor program controlling run, thus meets the demand of user's Different Light, different time, realizes optimal illumination state and maximum power saving rate.
figure 11 isupgrading main program flow chart; For ensureing firmware upgrade, the present invention adopts and utilizes User Defined firmware updating pattern.The flash storage module of PIC18F6493 series microprocessor be one can the physical memory cell of independent operation.Whole module arrangement is in same linear address space, and memory is divided into the section (message segment size is 128/64 byte) of multiple 512 bytes.Can wipe separately for each section, and under normal working voltage, program can carry out erasable operation to Flash, is therefore particularly suitable for online program upgrade.Self-defined firmware updating is exactly built-in one section of code for upgrade applications in a program, and communication interface also can be utilized to carry out the upgrading of remote code.It realizes principle is place two sections of codes in objective chip: one section is application program; Another section is ROMPaq.Both address fields are not overlapping, ROMPaq so just can be utilized to wipe application program, and write new code.
Figure 12 is upgrading subroutine flow chart.
In the general frame, 15 is LED light source power supply driver, and LED light source power supply driver is a composite type control board being integrated with multiple unit.As can be seen from the figure the installation wiring of LED light source power supply driver is all very easily.
Running software block diagram is shown in Fig. 6, Fig. 7, Fig. 8.
Software systems: software systems comprise following main program block: microprocessor PWM process main program, dimmer procedure, over-current over-voltage protection program, current constant control program etc.
Claims (3)
1. the technology of the present invention relates to power supply driver, is related specifically to a kind of Novel LED light source driver.
2. it comprises protective circuit 1, switching circuit 2, DC/DC power supply 3, V/I sample circuit 4, protection switch 5, LED light source module 6, power conversion unit 7, time control unit 8, microprocessor 9, temperature sensor 10, illuminance transducer 11, JATG interface 12, EEPROM unit 13 and Power Supply Monitoring/reset circuit 14 and forms.
3. the present invention adopts temperature sensor and microprocessor, intelligent control LED light source module working temperature; Have employed the detection of illuminance transducer as ambient light illumination, provide a best PWM value by the particular algorithm of microprocessor, in order to regulate the electric current of LED light source module to reach the object regulating brightness; Time control unit is connected to microprocessor, provides real-time time calendar information and process the switch lamp time of Various Seasonal and Different periods for system; Overcurrent protection is a kind of power source loads defencive function, with the damage of the overload output current avoiding comprising the short circuit on lead-out terminal to power supply and load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510345362.9A CN105188184A (en) | 2015-06-22 | 2015-06-22 | Novel LED light source power driver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510345362.9A CN105188184A (en) | 2015-06-22 | 2015-06-22 | Novel LED light source power driver |
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| CN105188184A true CN105188184A (en) | 2015-12-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149525A (en) * | 2018-11-05 | 2019-01-04 | 浙江禾川科技股份有限公司 | A kind of shorted to earth protective device and inverter system |
| CN111954333A (en) * | 2020-08-06 | 2020-11-17 | 南昌大学 | Light source system and method for regulating and controlling sub-clock hyperfine pulse |
-
2015
- 2015-06-22 CN CN201510345362.9A patent/CN105188184A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149525A (en) * | 2018-11-05 | 2019-01-04 | 浙江禾川科技股份有限公司 | A kind of shorted to earth protective device and inverter system |
| CN111954333A (en) * | 2020-08-06 | 2020-11-17 | 南昌大学 | Light source system and method for regulating and controlling sub-clock hyperfine pulse |
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Application publication date: 20151223 |