CN202269063U - Control circuit of zero light attenuation of LED road illumination lamp - Google Patents
Control circuit of zero light attenuation of LED road illumination lamp Download PDFInfo
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- CN202269063U CN202269063U CN2011203782799U CN201120378279U CN202269063U CN 202269063 U CN202269063 U CN 202269063U CN 2011203782799 U CN2011203782799 U CN 2011203782799U CN 201120378279 U CN201120378279 U CN 201120378279U CN 202269063 U CN202269063 U CN 202269063U
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Abstract
The utility model relates to a control circuit of zero light attenuation of an LED road illumination lamp. The control circuit reserves a certain power allowance (generally 30-50 percent) through an adjustable constant-current drive power supply, and outputs a current which is 1.5 or more times of a normal current of the LED road illumination lamp; and the adjustable constant-current drive power supply is provided with a dimming control interface which is controlled by a singlechip, the singlechip compensates and controls the output current within a certain time unit through calculating operation time of the illumination lamp so as to control the zero light attenuation output current of the LED road illumination lamp, so that the illumination lamp has zero light attenuation within a nominal service life. The control circuit compensates the normal light attenuation of a lamp bead through regulating the output current of the power supply, thus the light attenuation problem of the LED lamp is effectively solved, and the zero light attenuation of a high-power LED lamp is realized.
Description
Technical field
The utility model relates to the control circuit of a kind of LED lighting zero light decay.
Background technology
LED is as the light source of a new generation; Have many premium properties; The energy of electron transition and hole-recombination that because of its principle is PN junction is luminous, so be solid state light emitter, adds the fluorescent material technology of efficient stable; The incomparable superiority of many conventional light source such as led light source has the luminous efficiency height, power consumption is few, the life-span is long, photochromic pure, stable height, high safety, environmental protection, anti-vibration; Be a kind of lighting technology of environmental protection, under the background of China and global energy-saving and emission-reduction, the arriving of LED illumination is close at hand.
The LED light decay is meant LED after lighting after a while, and its light intensity can be lower than original light intensity, and low part is exactly the light decay of LED.It is (under 25 ℃ the normal temperature) under laboratory conditions that test is done by general LED encapsulation producer, lights continuously with the direct current of 20MA and contrasts its light intensity before and after lighting in LED1000 hour.
At present, led function property lighting all adopts powerful lamp pearl, though comparatively speaking; The LED life-span is very long: guaranteeing can to reach 200000 hours under the 25 degree junction temperature situation, but because the restriction of semiconductor light-emitting-diode wafer technologies at present, the photoelectric conversion efficiency of LED is still waiting to improve; Especially great power LED; Nearly electric energy more than 70% becomes heat energy and discharges, and the validity of heat dissipation technology and science neither be very desirable, add harsh environments for use such as light fixture outward appearance; The situation that LED light declines is inevitable; So present LED lamp life level is lower, the product of difference is less than 10000 hours, and this makes LED promotion and application speed receive very big influence.
Summary of the invention
The purpose of the utility model provides the control circuit of a kind of LED light fixture zero light decay, and this circuit effectively solves the light decay problem of LED light fixture through the normal light decay part of output current compensating lamp pearl of adjustment power supply, has realized the zero light decay of high-power LED lamp.
The control circuit of the described LED road lighting lamp of the utility model zero light decay; Comprise LED light modulation driving power circuit, single chip circuit, ferroelectric holder circuit, temperature sensor circuit, converter circuit with brightness adjustment control interface; Wherein, Output of output and single chip circuit with LED light modulation driving power P1 of brightness adjustment control interface is connected, and two outputs of single chip circuit are connected with the converter circuit input with the input of ferroelectric holder circuit respectively; The input of single chip circuit is connected with the output of temperature sensor, and another input of the output of ferroelectric holder circuit and single chip circuit is connected; The converter circuit output is connected with the 3rd input of single chip circuit; LED light modulation driving power circuit receives the control of switch, realizes the switch of power supply, also receives the control of dimmer voltage simultaneously, the size of control output current; Ferroelectric holder circuit is used to preserve LED light fixture accumulated running time data, the data that single-chip microcomputer can read-write memory, and prevent writing of interfering data; Converter circuit is used for converting the realization digital signal into analog signal, and reference circuit is that converter output voltage provides reference voltage base; Temperature sensor circuit is the junction temperature that single-chip microcomputer provides the thermal resistance calculation of light source to go out light source, so that single-chip microcomputer is accurately exported Control current; One-chip computer module is the core of the said circuit of the utility model, stores junction temperature light decay characteristic curve and the luminous flux of the LED curve to electric current; Set up the list data Mathematical Modeling; Calculate LED light fixture accumulative total lighting hours and output current compensated curve, through transducer output aanalogvoltage, the size of control light modulation driving power output current; With the constant output luminous flux, make LED road lighting lamp zero light decay.
Said LED light modulation driving power circuit with brightness adjustment control interface comprises LED light modulation driving power P1, resistance, constant voltage driving power supply P2; Wherein, LED light modulation driving power P1 incoming line is a single phase poaer supply, and the L live wire of single phase poaer supply is connected with the normally opened contact of the switch sections of relay R J1, and N is zero line, FG ground connection; LED light modulation driving power output multi-channel DC constant-current LED 1, LED2 ... LEDn; The anode LED+ of every group of led light source is connected with the output cathode of LED light modulation driving power P1, and the negative terminal LED-of led light source is connected with the output negative pole of LED light modulation driving power P1, and the lamp pearl of light source is all connected; End with constant voltage driving power supply P2 of constant voltage output interface is connected with the L live wire; N is zero line, FG ground connection; Wherein two outputs are respectively with tantalum matter electrochemical capacitor C6, be connected with the end of tantalum matter electrochemical capacitor C7; The 3rd output is connected the back and is connected the other end ground connection of tantalum matter electrochemical capacitor C7 with the feeder ear of single chip circuit with the tantalum matter electrochemical capacitor C6 other end.
Said single chip circuit comprises single-chip microcomputer U3, house dog U1, electric capacity, triode T1, crystal oscillator Y1 and resistance R 1; Wherein, The 3rd interface end of single-chip microcomputer U3 is connected with first interface end of crystal oscillator Y1, simultaneously the parallelly connected over the ground starting of oscillation capacitor C 8 of this interface end of crystal oscillator Y1; Second interface end of crystal oscillator Y1 is connected with the 4th interface end of single-chip microcomputer, simultaneously the parallelly connected over the ground starting of oscillation capacitor C 9 of this interface end of crystal oscillator Y1; The emission collection of triode is connected with the end of the relay drive part RJ1 of LED light modulation driving power circuit, grounded collector, and the end of base stage connecting resistance R1, resistance R 1 other end is connected with the 20 interface end of single-chip microcomputer U3; The 12 the interface ground connection of single-chip microcomputer U3; First output pin of house dog U1 is connected with an input pin; Another output pin of house dog U1 links to each other with the 31 interface end of single-chip microcomputer, and the 3rd output pin is connected with the 30 interface end of single-chip microcomputer; The 4th the output pin ground connection of house dog U1; The 5th output pin of house dog U1 connects the 5V power supply.
Said ferroelectric holder circuit comprises ferroelectric memory U2, resistance, wherein, three interface end ground connection of ferroelectric memory U2, and with single-chip microcomputer U3 through I2 interface ground connection, the physical address that makes memory chip is A0, the 4th interface end grounding leg; The 5th interface end is connected with the 23 interface end of single-chip microcomputer through R2, and the 6th interface end of ferroelectric memory U2 is connected with the 22 interface end of single-chip microcomputer through R5; The 7th interface end of ferroelectric memory U2 is connected with the 21 interface end of single-chip microcomputer, and the 8th interface end of ferroelectric memory U2 is through capacitor C 2 ground connection.
Said converter circuit comprises transducer U4, resistance, the operational amplifier of sixteen bit resolution, and wherein first interface end of transducer U4 is connected with the positive input terminal of operational amplifier U6 through resistance R 7; The negative input end of operational amplifier U6 is through resistance R 6 ground connection; Second interface end ground connection of transducer U4; The 3rd interface end of transducer U4 is for being reference voltage VREF, and this interface end is received the high-precision 2.5V benchmark of LT1009 output, for transducer U4 output voltage provides reference voltage base; The 4th interface end of transducer U4 is connected with the 6th interface end of single-chip microcomputer U3; The 5th interface end of transducer U4 is connected with the 7th interface end of single-chip microcomputer; The 6th interface end of transducer U4 is connected with the 8th interface end of single-chip microcomputer; The 8th interface termination 5V of transducer U4 voltage;
The positive feedback end of operational amplifier U6 is connected with an end of resistance R 7, and resistance R 7 other ends are connected with the output of transducer U4; The negative feedback end of operational amplifier U6 is connected with an end of resistance R 6; The other end ground connection of resistance R 6; Simultaneously the negative feedback end of operational amplifier U6 is connected with an end of resistance R 5, resistance R 8 another terminations with pass through resistance R 11 again after the deferent segment of operational amplifier U6 is connected and be connected with the dimming interface of LED adjustable constant-flow light modulation driving power circuit.
Said temperature sensor circuit comprises temperature sensor U7, resistance, first interface end ground connection of temperature sensor U7, and second interface end is connected with the 18 interface end of single-chip microcomputer U3 through resistance R 12, and passes through resistance R 13 and be connected with+5V power supply.
Adopt the utility model method; Control circuit at LED light fixture zero light decay; Setting has reliable and stable high-performance radiator, and this radiator has certain heat radiation surplus (being generally 30～50%), can the efficiently radiates heat initial condition 1.5 times or more; Even under the state of driving power output maximum current, must guarantee that also certain efficiently radiates heat surface area (is not less than 25cm
2The efficiently radiates heat area of/W), also comprise heat radiation after the regulating and controlling.
In the control circuit of LED light fixture zero light decay, also be provided with an adjustable constant-current driving power supply; Driving power has been reserved certain power surplus (being generally 30～50%); Driving power can be exported 1.5 times of the light fixture normal current or more; Constant-current supply has brightness adjustment control interface (being generally simulation dimming interface or the PWM control interface of 0～10V), receives Single-chip Controlling, and single-chip microcomputer is through calculating light fixture accumulated running time; With certain hour unit (can for minute, hour, fate, every month, each season or every year) compensation control output current, realize LED light fixture zero light decay performance.
As time goes on light decay unavoidably will take place in LED lamp pearl under a constant current; Adopt the said circuit of the utility model, can be according to junction temperature and the light decay life characteristic of lamp pearl, and the luminous flux of lamp pearl is to the characteristic curve of electric current; Set up rational mathematical model; The size of control output current of intelligence makes LED light fixture zero light decay in useful life, realizes the purpose of the zero light decay of large-power lamp.
Description of drawings
Fig. 1 is the flow chart of the said method of the utility model;
Fig. 2 is the circuit diagram of the said method of the utility model;
Fig. 3 is the LED life curve figure of the said method of the utility model;
Fig. 4 is the LED luminous flux current curve diagram of the said method of the utility model.
Embodiment
In order to be illustrated more clearly in the technical scheme of the utility model, will do brief account to the technical scheme accompanying drawing below.
Referring to Fig. 1, Fig. 3, Fig. 4.
Fig. 1 LED life curve explains that the light decay of LED is relevant with its junction temperature, and so-called junction temperature is exactly the temperature of semiconductor PN, the high more light decay that more early occurs of junction temperature, and the curve of light decay is precipitous more, and just the life-span is short more;
Fig. 2 luminous flux current curve; The lamp pearl is exported 100% luminous flux of nominal under the 350mA electric current; Along with the increase of electric current, under the constant situation of junction temperature, luminous flux almost is to increase according to a fixing slope; Lamp pearl maximum can be born 3 times of nominal current, can offset the light decay of lamp pearl itself fully through the adjustment electric current.
According to Fig. 1, Fig. 2 curve is set up Mathematical Modeling in single-chip microcomputer, obtains the curve that electric current slowly increases.The method of LED road lighting lamp zero light decay has following steps:
1) in single-chip microcomputer, sets up the junction temperature light decay characteristic curve of LED, for the monolithic function inquires light fixture corresponding light source light decay data running time according to this curve; In single-chip microcomputer, set up luminous flux current characteristics curve, for the monolithic function arrives corresponding offset current data according to the light decay data query; Single-chip microcomputer is according to this Mathematical Modeling list data, utilizes the voltage of the actual needs compensation output that LED light fixture accumulated running time calculates;
2) control circuit of LED light fixture zero light decay is started working, and initialization of register in one-chip machine port and the single-chip microcomputer makes the monolithic function normally move, and for calculating offset current condition is provided;
3) open LED driving power switch, the LED road lighting lamp is started working;
4) single-chip microcomputer reads the LED road lighting lamp running time that ferroelectric memory stores, and these data are one group of hexadecimal datas, as the control data that calculates offset current;
5) single-chip microcomputer reads LED road lighting lamp running time; With light decay characteristic curve, luminous flux in the Mathematical Modeling curve of electric current is compared; Convert output current data into and output to the DA transducer; Transducer converts digital signal into aanalogvoltage, is transferred to the brightness adjustment control interface of light modulation driving power, is used to control the size of light modulation driving power output current;
6) single-chip microcomputer is according to lighting hours; Judge whether that the LED road lighting lamp that is provided with need adjust the time of electric current; If to the time that is provided with, then, compare through transducer output aanalogvoltage with the lighting hours and the output current compensated curve of LED road lighting lamp accumulative total; The size of control light modulation driving power output current is guaranteed circuit output constant light flux; If do not arrive the time that is provided with, then signal delivered to step 5) and compare again, change.
Referring to Fig. 3.
The control circuit of LED road lighting lamp zero light decay comprises LED light modulation driving power circuit, single chip circuit, ferroelectric holder circuit, temperature sensor circuit, the converter circuit with brightness adjustment control interface; Wherein, Input of output and single chip circuit with LED light modulation driving power P1 of brightness adjustment control interface is connected, and two outputs of single chip circuit are connected with the converter circuit input with the input of ferroelectric holder circuit respectively; The 3rd output of single chip circuit is connected with the input of temperature sensor, and another input of the output of ferroelectric holder circuit and single chip circuit is connected; The converter circuit output is connected with the 3rd input of single chip circuit; LED light modulation driving power circuit receives the control of Switching Power Supply, realizes the switch of power supply, also receives the control of dimmer voltage simultaneously, the control maximum output current; Ferroelectric holder circuit is used to preserve LED light fixture accumulated running time data, and the data that single-chip microcomputer can read-write memory prevent to disturb to write data; Converter circuit is used for converting the realization digital signal into analog signal, for converter output voltage provides reference voltage base; Temperature sensor circuit is the junction temperature that single-chip microcomputer provides the thermal resistance calculation of light source to go out light source, so that single-chip microcomputer is accurately exported Control current; One-chip computer module is the core of the control circuit of LED light fixture zero light decay, stores junction temperature light decay characteristic curve and the luminous flux of the LED curve to electric current; Set up Mathematical Modeling; Calculate LED light fixture accumulative total lighting hours and output current compensated curve, through transducer output aanalogvoltage, control light modulation constant-current supply; With the constant output luminous flux, make LED road lighting lamp zero light decay.
Said LED light modulation driving power circuit with brightness adjustment control interface comprises constant voltage driving power supply P2, resistance, LED light modulation driving power P1, and wherein, LED light modulation driving power P1 incoming line is a single phase poaer supply; The L live wire of single phase poaer supply is connected with the normally opened contact of relay J 1, and N is zero line, FG ground connection, the input voltage range AC90 of single phase poaer supply～305V; Frequency 47～63hz; Wherein the L live wire is controlled by relay J 1 switch, receives normally opened contact, can realize the switch of power supply; Driving power output multi-channel DC constant-current LED 1, LED2 ... LEDn, every group anode LED+ is connected to the positive pole of LED light modulation driving power P1, and negative terminal LED-is connected to the negative pole of LED light modulation driving power P1, and light source is that 28 high-power lamp pearls are all connected.The constant current of multichannel is Duoed about 50% surplus than the 350mA electric current of nominal, receives dimmer voltage (DC 1～10V) control; The light modulation incoming line is the two core cable line, and input voltage range is DC 0～10V, 10% of the corresponding control output of 0～1V maximum current, the corresponding control of 10V maximum output current.
Constant voltage driving power supply P2 with LED light modulation driving power circuit of brightness adjustment control interface is the high-performance micro Switching Power Supply, and its model is AC-DC.Three interface end of constant voltage driving power supply P2 are connected with 1,2,3 pin of relay J 1 respectively; Two outputs of constant voltage driving power supply P2 are connected with the end of tantalum matter electrochemical capacitor with tantalum matter electrochemical capacitor C6, C7 respectively; The 3rd output is connected the back and is connected the other end ground connection of tantalum matter electrochemical capacitor C7 with the emission collection of single chip circuit triode with the tantalum matter electrochemical capacitor C6 other end.Constant voltage driving power supply P2 provides quality higher direct voltage, for single-chip microcomputer and peripheral circuit thereof provide the direct-current working volts of 5V, and for triode provides the direct-current working volts of 12V, the output of this voltage and LED light modulation supply independent, independent fully.
Single chip circuit comprises single-chip microcomputer U3, house dog U1, electric capacity, triode T1, crystal oscillator Y1 and resistance R 1, wherein, the model of single-chip microcomputer U3 be STC12C5612AD.1 pin of the 3rd interface end of single-chip microcomputer U3 and crystal oscillator Y1 connects 3 pin of single-chip microcomputer U3, simultaneously the parallelly connected over the ground starting of oscillation capacitor C 8 of 1 pin of crystal oscillator Y1; 2 pin of crystal oscillator Y1 connect 4 pin of single-chip microcomputer, and the parallelly connected over the ground starting of oscillation capacitor C 9 of 2 pin of while crystal oscillator Y1 is for single-chip microcomputer provides clock reference.Triode is the PNP triode, and its model is S8550, and the P2 power supply does not receive Single-chip Controlling, as long as there is civil power that voltage output is then arranged always.The emission collection of triode T1 is connected with LED light modulation driving power circuit repeat circuit drive part RJ1 one end.The grounded collector of triode; The end of base stage connecting resistance R1; Resistance R 1 other end is connected the switch drive function of having accomplished driving power with 20 pin of single-chip microcomputer U3, and the single-chip microcomputer output low level can the controlling and driving power work, and the output high level can stop driving power work.
House dog U1 adopts the MAX813L of MAXIM company, is the external hardware of single chip circuit, is used to prevent single chip microcomputer halt under the abnormal conditions, single-chip microcomputer can be resetted under strong the interference rerun, and is equivalent to re-power.1 pin of house dog U1 is connected with 8 pin, and whether watchdog chip is crossed in normal running in 1.6s can to keep watch on single-chip microcomputer; 7 pin of house dog U1 are connected with 31 pin of single-chip microcomputer, make resetting that the hardware watchdog chip can control single chip computer, and powering on provides the high level of 140ms, make the single-chip microcomputer reliable reset.The 6th pin of house dog U1 is connected with 30 pin of single-chip microcomputer, is the link of shaking hands of watchdog chip, accepts the control of single-chip microcomputer, is the bridge that is connected with single-chip microcomputer; 3 pin of house dog U1 are earth terminals of chip, and necessary ground connection can not be unsettled; The 2nd pin is the 5V power end, and the 5V of supervision voltage function is arranged, and when being lower than 4.4V, single-chip microcomputer resets.The 4 pin ground connection of house dog U1; 4 pin of house dog U1 connect the 5V power supply.
Said ferroelectric holder circuit comprises ferroelectric memory U2, resistance, and wherein, ferroelectric memory U2 is used to preserve LED light fixture accumulated running time data.The 1st, 2, the 3 pin ground connection of ferroelectric memory U2, and with single-chip microcomputer U3 through I2C interface ground connection, the physical address that makes memory chip is A0.The 4 pin ground connection of ferroelectric memory U2, the 5th pin is connected with the 23rd pin of single-chip microcomputer U3 through resistance R 2, and the 6th of ferroelectric memory U2 passes through resistance R 5 and is connected with 22 pin of single-chip microcomputer; The 5th, 6 pin of ferroelectric memory U2 is the data-interface end of single-chip microcomputer and memory, observes the I2C communications protocol, the data that single-chip microcomputer can read-write memory; 7 pin of ferroelectric memory U2 are connected with 21 pin of single-chip microcomputer, are the memory protection ends, and this pin is that low level is just can write data, during high level, does not allow to write data, and single-chip microcomputer finishes in write data put height, can effectively prevent to disturb the mistake write data; 8 pin of ferroelectric memory U2 are 5V power ends of memory, through capacitor C 2 ground connection.
Said converter circuit comprises transducer U4, resistance, the operational amplifier of sixteen bit resolution, and transducer U4 is the MAX541 of MAXIM company, is the transducer U4 (DA) of high-performance sixteen bit resolution, is used to realize that digital quantity arrives the conversion of analog quantity.Wherein 1 pin of transducer U4 is the aanalogvoltage delivery outlet, and output voltage range is 0～VREF; First interface end of transducer U4 is connected with the positive input terminal of operational amplifier U6 through resistance R 7; The negative output terminal of operational amplifier U6 is through resistance R 6 ground connection; The 2 pin ground connection of transducer U4; 3 pin of transducer U4 are reference voltage VREF, and input range is DC2～3V, and this pin is received the high-precision 2.5V benchmark of LT1009 output, and its effect is for the DA output voltage reference voltage base to be provided; 4 pin of transducer U4 are that the sheet choosing end of MAX541 chip is connected with 6 pin of single-chip microcomputer U3, and low level effectively enables SPI and accepts data, and high level does not receive the SPI data; 5 pin of transducer U4 are clock lines of spi bus, are connected with the 7th pin of single-chip microcomputer; The 6th pin is that the SPI data wire is connected with the 8th pin of single-chip microcomputer; The 8th pin is the voltage pin of chip, connects 5V voltage.
The model of operational amplifier U6 is TLC2274, is the rail-to-rail low drift amplifier of TI company, can export the voltage of full amplitude.The positive feedback end of operational amplifier U6 is connected with an end of resistance R 7, and resistance R 7 other ends are connected with the output (1 pin of U4) of transducer U4; The negative feedback end of operational amplifier U6 is connected with an end of resistance R 6; The other end ground connection of resistance R 6; Simultaneously the negative feedback end of operational amplifier U6 is connected with an end of resistance R 5, resistance R 8 another terminations with pass through resistance R 11 again after the output of operational amplifier U6 is connected and be connected composition positive feedback amplifying circuit with the dimming interface of LED light modulation driving power circuit; Multiplication factor G=1+R8/R6; Can the voltage 0～2.5V of DA output be amplified to the scope of 0～10V, through the dimming interface of controlling and driving power supply after resistance R 11 current limlitings.
Said temperature sensor circuit comprises temperature sensor U7, resistance, and temperature sensor U7 is a 1-wire digital temperature sensor, and single-chip microcomputer only need just can read digital temperature through a data lines and put, and the temperature-measuring range of temperature sensor is-55～+ 125 ℃.The 1 pin ground connection of temperature sensor U7,2 pin are connected to 18 pin of single-chip microcomputer U3 through resistance R 12, and are connected with+5V power supply through resistance R 13.The monolithic function calculates the junction temperature of light source through the conditions such as thermal resistance of light source, thereby for accurately exporting Control current foundation is provided.。
One-chip computer module U3 is the core of the said control circuit of the utility model, stores junction temperature light decay characteristic curve and the luminous flux of the LED curve to electric current; And the Mathematical Modeling form of setting up, calculate LED light fixture accumulative total lighting hours and output current compensated curve, through DA output aanalogvoltage; The size of control LED light modulation driving power output current, as: calculating light fixture running time is 1000 hours, and calculating 85 ° of light decays of junction temperature is 2%; Offset current is exactly 2% so; Control DA output voltage is 1.02 times of nominal normal voltage 1.75V, and output current is 1.02% times of nominal current just, compensated normal light decay 2%; Reach the effect of output constant light flux, realized light fixture zero light decay ideal effect.
This circuit can the intelligent control regulating photoelectric source electric current of output increase and increase along with time of led light source accumulative total illumination, thereby realized that the increase with LED light fixture accumulative total lighting hours increases the luminous flux of led light source output, has realized the zero light decay of LED light fixture.Guaranteed the LED light fixture in designed life, the luminous flux of output can be constant all the time in the scope of needs along with the increase of accumulative total lighting hours.
During work, the control circuit energising of LED light fixture zero light decay, single-chip microcomputer initialization output port and internal work register; Single-chip microcomputer U3 operate as normal: begin to read light fixture data running time of preserving in the ferroelectric ferroelectric memory, as: 1000 hours, the inner light fixture junction temperature light decay curve data of inquiry single-chip microcomputer was: 2%; The inner luminous flux of inquiry single-chip microcomputer to the current curve data as being: the corresponding 350mA of 100% luminous flux, calculating output current is 102%, that is: 102 * 350mA=357mA; Calculate the value that needs output voltage, as: 1.75V voltage is exported 100% electric current of corresponding light modulation power supply, and the output of this moment control voltage is 1.75V * 102%=1.785V so; Single-chip microcomputer need be exported 1.785V through DA transducer U4; Promptly accomplished the calculating of an offset current, if luminous flux is set hour serve as control unit offset current, the single-chip microcomputer per minute write one time running time data arrive ferroelectric memory; And judge whether whole hour; And the calculating offset current, realized the light fixture continuous operation, make output luminous flux can along with accumulative total lighting hours increase constant all the time in the scope of needs.
Claims (6)
1. the control circuit of a LED road lighting lamp zero light decay; It is characterized in that: this circuit comprises LED light modulation driving power circuit, single chip circuit, ferroelectric holder circuit, temperature sensor circuit, the converter circuit with brightness adjustment control interface; Wherein, Output of brightness adjustment control end and single chip circuit with LED light modulation driving power P1 of brightness adjustment control interface is connected, and two outputs of single chip circuit are connected with the converter circuit input with the input of ferroelectric holder circuit respectively; The input of single chip circuit is connected with the output of temperature sensor, and another input of the output of ferroelectric holder circuit and single chip circuit is connected; The converter circuit output is connected with the 3rd input of single chip circuit; LED light modulation driving power circuit receives the control of switch, realizes the switch of power supply, also receives the control of dimmer voltage simultaneously, the size of control output current; Ferroelectric holder circuit is used to preserve LED light fixture accumulated running time data, the data that single-chip microcomputer can read-write memory, and prevent writing of interfering data; Converter circuit is used for converting the realization digital signal into analog voltage signal, and reference circuit is that converter output voltage provides reference voltage base; Temperature sensor circuit is the junction temperature that single-chip microcomputer provides the radiator temperature of light source to go out light source again according to thermal resistance calculation, so that single-chip microcomputer is accurately exported Control current; One-chip computer module is the core of circuit, stores junction temperature light decay characteristic curve and the luminous flux of the LED curve to electric current; Set up the list data Mathematical Modeling; Calculate LED light fixture accumulative total lighting hours and output current compensated curve, through transducer output aanalogvoltage, the size of control light modulation driving power output current; With the constant output luminous flux, make LED road lighting lamp zero light decay.
2. circuit according to claim 1; It is characterized in that: said LED light modulation driving power circuit with brightness adjustment control interface comprises LED light modulation driving power P1, resistance, constant voltage driving power supply P2; Wherein, LED light modulation driving power P1 incoming line is a single phase poaer supply, and the L live wire of single phase poaer supply is connected with the normally opened contact of the switch sections of relay R J1, and N is zero line, FG ground connection; LED light modulation driving power output multi-channel DC constant-current LED 1, LED2 ... LEDn; The anode LED+ of every group of led light source is connected with the output cathode of LED light modulation driving power P1, and the negative terminal LED-of led light source is connected with the output negative pole of LED light modulation driving power P1, and the lamp pearl of light source is all connected; End with constant voltage driving power supply P2 of constant voltage output interface is connected with the L live wire; N is zero line, FG ground connection; The P2 power supply does not receive Single-chip Controlling, as long as there is civil power that voltage output is then arranged always, wherein two outputs are connected with the end of tantalum matter electrochemical capacitor with tantalum matter electrochemical capacitor C6, C7 respectively; The 3rd output is connected the back and is connected the other end ground connection of tantalum matter electrochemical capacitor C7 with the feeder ear of single chip circuit with the tantalum matter electrochemical capacitor C6 other end.
3. circuit according to claim 1; It is characterized in that: said single chip circuit comprises single-chip microcomputer U3, house dog U1, electric capacity, triode T1, crystal oscillator Y1 and resistance R 1; Wherein, The 3rd interface end of single-chip microcomputer U3 is connected with first interface end of crystal oscillator Y1, simultaneously the parallelly connected over the ground starting of oscillation capacitor C 8 of this interface end of crystal oscillator Y1; Second interface end of crystal oscillator Y1 is connected with the 4th interface end of single-chip microcomputer, simultaneously the parallelly connected over the ground starting of oscillation capacitor C 9 of this interface end of crystal oscillator Y1; The emission collection of triode is connected with the end of the relay drive part RJ1 of LED light modulation driving power circuit, grounded collector, and the end of base stage connecting resistance R1, resistance R 1 other end is connected with the 20 interface end of single-chip microcomputer U3; The 12 the interface ground connection of single-chip microcomputer U3; First output pin of house dog U1 is connected with an input pin; Another output pin of house dog U1 links to each other with the 31 interface end of single-chip microcomputer, and the 3rd output pin is connected with the 30 interface end of single-chip microcomputer; The 4th the output pin ground connection of house dog U1; The 5th output pin of house dog U1 connects the 5V power supply.
4. circuit according to claim 1; It is characterized in that: said ferroelectric holder circuit comprises ferroelectric memory U2, resistance; Wherein, three interface end ground connection of ferroelectric memory U2, and with single-chip microcomputer U3 through I2 interface ground connection; The physical address that makes memory chip is A0, the 4th interface end grounding leg; The 5th interface end is connected with the 23 interface end of single-chip microcomputer through R2, and the 6th interface end of ferroelectric memory U2 is connected with the 22 interface end of single-chip microcomputer through R5; The 7th interface end of ferroelectric memory U2 is connected with the 21 interface end of single-chip microcomputer, and the 8th interface end of ferroelectric memory U2 is through capacitor C 2 ground connection.
5. circuit according to claim 1; It is characterized in that: said converter circuit comprises transducer U4, resistance, the operational amplifier of sixteen bit resolution, and wherein first interface end of transducer U4 is connected with the positive input terminal of operational amplifier U6 through resistance R 7; The negative input end of operational amplifier U6 is through resistance R 6 ground connection; Second interface end ground connection of transducer U4; The 3rd interface end of transducer U4 is for being reference voltage VREF, and this interface end is received the high-precision 2.5V benchmark of LT1009 output, for transducer U4 output voltage provides reference voltage base; The 4th interface end of transducer U4 is connected with the 6th interface end of single-chip microcomputer U3; The 5th interface end of transducer U4 is connected with the 7th interface end of single-chip microcomputer; The 6th interface end of transducer U4 is connected with the 8th interface end of single-chip microcomputer; The 8th interface termination 5V of transducer U4 voltage;
The positive feedback end of operational amplifier U6 is connected with an end of resistance R 7, and resistance R 7 other ends are connected with the output of transducer U4; The negative feedback end of operational amplifier U6 is connected with an end of resistance R 6; The other end ground connection of resistance R 6; Simultaneously the negative feedback end of operational amplifier U6 is connected with an end of resistance R 5, resistance R 8 another terminations with pass through resistance R 11 again after the deferent segment of operational amplifier U6 is connected and be connected with the dimming interface of LED adjustable constant-flow light modulation driving power circuit.
6. circuit according to claim 1; It is characterized in that: said temperature sensor circuit comprises temperature sensor U7, resistance; First interface end ground connection of temperature sensor U7; Second interface end is connected with the 18 interface end of single-chip microcomputer U3 through resistance R 12, and passes through resistance R 13 and be connected with+5V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203782799U CN202269063U (en) | 2011-10-08 | 2011-10-08 | Control circuit of zero light attenuation of LED road illumination lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203782799U CN202269063U (en) | 2011-10-08 | 2011-10-08 | Control circuit of zero light attenuation of LED road illumination lamp |
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| Publication Number | Publication Date |
|---|---|
| CN202269063U true CN202269063U (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203782799U Expired - Lifetime CN202269063U (en) | 2011-10-08 | 2011-10-08 | Control circuit of zero light attenuation of LED road illumination lamp |
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| Country | Link |
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| CN (1) | CN202269063U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162191A (en) * | 2013-03-19 | 2013-06-19 | 苏州沃伦韦尔高新技术股份有限公司 | Operating lamp with distance measurement feedback illuminance automatic regulating function |
| CN105810119A (en) * | 2014-12-29 | 2016-07-27 | 深圳市奥拓光电科技有限公司 | LED lamp box luminous attenuation compensation method and LED lamp box with luminous attenuation compensation function |
| CN107104586A (en) * | 2017-03-29 | 2017-08-29 | 深圳市澳地特电气技术有限公司 | A kind of positive 10V dc sources protection circuit for frequency converter |
-
2011
- 2011-10-08 CN CN2011203782799U patent/CN202269063U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162191A (en) * | 2013-03-19 | 2013-06-19 | 苏州沃伦韦尔高新技术股份有限公司 | Operating lamp with distance measurement feedback illuminance automatic regulating function |
| CN105810119A (en) * | 2014-12-29 | 2016-07-27 | 深圳市奥拓光电科技有限公司 | LED lamp box luminous attenuation compensation method and LED lamp box with luminous attenuation compensation function |
| CN107104586A (en) * | 2017-03-29 | 2017-08-29 | 深圳市澳地特电气技术有限公司 | A kind of positive 10V dc sources protection circuit for frequency converter |
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