CN102913839B - Solar power supplied energy-saving illumination system - Google Patents

Solar power supplied energy-saving illumination system Download PDF

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Publication number
CN102913839B
CN102913839B CN201210435096.5A CN201210435096A CN102913839B CN 102913839 B CN102913839 B CN 102913839B CN 201210435096 A CN201210435096 A CN 201210435096A CN 102913839 B CN102913839 B CN 102913839B
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triode
circuit
power supply
resistance
battery
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CN201210435096.5A
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Chinese (zh)
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CN102913839A (en
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朱正菲
周士晖
张玉华
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浙江省能源与核技术应用研究院
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies
    • Y02B20/40Control techniques providing energy savings

Abstract

The invention relates to a solar power supplied energy-saving illumination system, and aims at providing the solar power supplied energy-saving illumination system, which can be used for supplying power to an electric light source directly by solar energy in daytime, and charging a storage battery by residual solar energy for night illumination. The solar power supplied energy-saving illumination is characterized by comprising a solar cell, the storage battery, an AC/DC (alternating current to direct current) backup power supply and an LED (light emitting diode) lamp assembly; the solar cell, the storage battery and the AC/DC backup power supply are connected with the LED lamp assembly through a system controller; the system controller comprises a charge management module which is used for controlling the solar cell to charge the storage battery, a power supply optimization module which is used for switching supplied power to the LED lamp assembly among the solar cell, the storage battery and the AC/DC backup power supply, and an illumination control module which is used for controlling the output power of the LED lamp assembly. The solar power supplied energy-saving illumination system is applicable in the technical field of solar energy.

Description

A kind of solar powered energy efficient lighting system

Technical field

The present invention relates to a kind of solar powered energy efficient lighting system.Be applicable to technical field of solar.

Background technology

Growing along with social and economic construction, China has become energy resource consumption big country, with coal, oil, natural gas is main conventional energy resource consumption, and its resource is non-renewable, and carbon dioxide and sulfur oxide are discharged in these energy resource consumptions simultaneously, cause global greenhouse effect and acid rain, welding.Therefore in order to preserve the ecological environment, realize sustainable development, to the exploitation of regenerative resource, arise at the historic moment.

Solar lighting developed rapidly in recent years as renewable energy utilization technology, and the demand of market to solar energy illuminating product increases increasingly.Solar lighting is the energy with solar energy, realizes opto-electronic conversion by solar cell.Current solar illuminating system is daytime with battery savings, stored electric energy mostly, and powered to electric light source by controller in the evening.But along with the development of society and the needs of economic construction, numerous illumination occasions resembles large supermarket, the electricity consumption on daytime that building, office building underground garage etc. all need is waited at market, hospital, school, boat station, station, and power consumption greatly, forms peak of power consumption by day.

Summary of the invention

The technical problem to be solved in the present invention is: for above-mentioned Problems existing, a kind of environmental protection is provided, safe and reliable solar powered energy efficient lighting system, can by day with solar energy directly to the power supply of electric light source, also unnecessary solar energy can be charged as battery simultaneously and provide illumination night, to alleviate the excessive contradiction of Peak power use load, also can be country and save some electrical power resource, at utmost realize the requirement of ecological, environmental protective and energy-saving low-carbon.

The technical solution adopted in the present invention is: a kind of solar powered energy efficient lighting system, there is solar cell, battery, AC/DC stand-by power supply and LED lamp group, it is characterized in that: described solar cell, battery are all connected LED lamp group through system controller with AC/DC stand-by power supply, described system controller comprises:

Charge management module, control solar cell is charge in batteries, solar cell directly for LED lamp group power time, unnecessary electricity is stored in battery;

Power supply preferred module, for at solar cell, switch the power supply of powering to LED lamp group between battery and AC/DC stand-by power supply three, solar cell for supplying power is preferential, secondly by storage battery power supply, when both cannot effectively power, start AC/DC stand-by power supply and power;

Lighting control module, for controlling LED lamp group power output.

Described charge management module comprises MPPT, and solar cell connects battery through MPPT, and battery was also connected to, low-voltage protection circuit and temperature protection circuit.

Described power supply preferred module comprises reverse-connection preventing circuit and power supply priority control circuit, and solar cell, battery and AC/DC stand-by power supply are connected to power supply priority control circuit through reverse-connection preventing circuit respectively.

Described lighting control module has noncontacting switch; and control illumination control circuit and the time switch of noncontacting switch break-make; described power supply priority control circuit is connected to LED lamp group through illumination control circuit and noncontacting switch, is also connected to current foldback circuit between LED lamp group and illumination control circuit.

Described reverse-connection preventing circuit has FET, the indirect Zener diode of the grid of FET, source electrode, drain electrode, the indirect diode of source electrode, source ground, grid connecting resistance.

Described power supply priority control circuit comprises sun-generated electric power signal sample circuit, battery feed signal sample circuit, stagnant chain rate compared with circuit I and stagnant chain rate comparatively circuit I I, sun-generated electric power signal sample circuit sampling solar battery power signal, through stagnant chain rate comparatively circuit I judge whether effectively to power, as can not then starting storage battery power signal sampling circuit sampling storage battery source signal, through stagnant chain rate comparatively circuit I I judge whether effectively to power, power as AC/DC stand-by power supply then can not be started.

Described illumination control circuit has MCU, and MCU is electrically connected with two controlling brancher, and two controlling brancher control section LED lamp group respectively, MCU controls the output state of two controlling brancher respectively according to system time.

Described current foldback circuit has proportional amplifier and comparator; proportional amplifier output connects comparator non-inverting input; comparator output terminal is connected to comparator non-inverting input through diode and resistance, and comparator non-inverting input is through touch-switch ground connection.

Described sun-generated electric power signal sample circuit comprises resistance SR1, SR2, SR2' and electric capacity SC1, the in parallel and one end ground connection of resistance SR2, SR2' and electric capacity SC1, and the other end connects power supply through resistance SR1; Described stagnant chain rate comparatively circuit I is made up of resistance SR3, SR4, SR5, adjustable resistor SRP and operational amplifier A R1, and solar-electricity source signal sample magnitude of voltage is accessed by operational amplifier A R1 reverse input end; Operational amplifier A R1 output is connected to the base stage of triode SQ1 through resistance SR6, triode SQ1 is respectively through resistance SR10, SR9, SR8 connecting triode SQ4, SQ3, SQ2 base stage, wherein triode SQ2 colelctor electrode is through optocoupler SU1 connecting triode SQ7, SQ8 base stage, triode SQ7, SQ8 emitter stage jointly through resistance SR15 to FET SQ5, SQ6 grid;

Described battery feed signal sample circuit is identical with sun-generated electric power signal sample circuit, stagnant chain rate is identical compared with circuit I with stagnant chain rate compared with circuit I I, stagnant chain rate compared with circuit I I output through the base stage of resistance BR6 to triode BQ1, triode BQ1 colelctor electrode is respectively through resistance BR9, BR8 connecting triode BQ8, BQ2 base stage, wherein triode BQ2 base stage is connected with triode SQ4 colelctor electrode, triode BQ2 colelctor electrode through optocoupler BU1 connecting triode BQ3, BQ4 base stage, triode BQ3, BQ4 emitter stage jointly through resistance BR14 to FET BQ5, BQ6 grid;

Described triode BQ8, SQ3 colelctor electrode is connected to triode AQ1 base stage, triode AQ1 colelctor electrode through optocoupler AU1 connecting triode AQ3, AQ2 base stage, triode AQ3, AQ2 emitter stage jointly through resistance AR6 to FET AQ5, AQ4 grid.

The P3.5 of described MCU is connected to triode 1Q2 base stage through resistance 1R11, triode 1Q2 collector connecting transistor 1Q3 base stage, triode 1Q3 colelctor electrode connecting triode 1Q4,1Q5 base stage, triode 1Q4,1Q5 emitter stage connects the grid of FET 1Q1 jointly through resistance 1R16; The P3.7 of described MCU have the circuit identical with on P3.5.

The invention has the beneficial effects as follows: the present invention adopts MPPT MPPT maximum power point tracking technology, solar cell is made to play maximal efficiency, use power supply optimization technique more can meet the actual conditions of current renewable energy utilization, also can make the reliable and stable operation of lighting circuit simultaneously, can use continuously for a long time, not need to increase cost, environmental protection, the contradiction that Peak power use load is excessive can be alleviated, also can be country and save some electrical power resource, at utmost realize the requirement of ecological, environmental protective and energy-saving low-carbon.

Accompanying drawing explanation

Fig. 1 is theory diagram of the present invention.

Fig. 2 is the circuit block diagram of system controller in the present invention.

Fig. 3 is the circuit theory diagrams of reverse-connection preventing circuit in embodiment.

Fig. 4 is the circuit theory diagrams of priority control circuit of powering in embodiment.

Fig. 5 is the circuit theory diagrams of illumination control circuit in embodiment.

Fig. 6 is the circuit theory diagrams of current foldback circuit in embodiment.

Fig. 7 is the voltage source in embodiment used by system controller.

Fig. 8 is MPPT solar charging electrical schematic diagram in embodiment.

Detailed description of the invention

As shown in Figure 1, the present embodiment has solar cell 1, battery 2, AC/DC stand-by power supply 3(civil power supplement stand-by power supply, AC/DC24V inversion exports) and LED lamp group 5, and solar cell 1, battery 2 are all connected LED lamp group 5 by system controller 4 with AC/DC stand-by power supply 3.In this example, system controller 4 comprises charge management module, power supply preferred module and lighting control module, and wherein charge management module is when solar cell 1 is powered for LED lamp group 5, is stored in battery 2 by unnecessary for solar cell 1 electricity; Supply access is switched to solar cell 1 and directly powers port by power supply preferred module, preferentially powered by solar cell 1, when solar cell 1 because raining, night etc., reason can not effectively be powered time, after power supply preferred module detects signal, carry out power supply port to switch, carry out output by battery 2 pairs of LED lamp groups 5 to power, when solar cell can not effectively power and batteries to store energy deficiency, power supply preferred module enables AC/DC stand-by power supply 3 after signal after testing, switches the illumination of power supply port controlling and exports; Lighting control module directly controls the power output of LED lamp group 5.

As shown in Figure 2, in the present embodiment, charge management module comprises MPPT403, and solar cell 1 connects battery 2 through MPPT403, and battery 2 was also connected to, low-voltage protection circuit 401 and temperature protection circuit 402.Power supply preferred module comprises reverse-connection preventing circuit 404 and power supply priority control circuit 405, and solar cell 1, battery 2 and AC/DC stand-by power supply 3 are connected to power supply priority control circuit 405 through reverse-connection preventing circuit 404 respectively.Described lighting control module has noncontacting switch 408; and control illumination control circuit 406 and the time switch 409 of noncontacting switch 408 break-make; institute tells power supply priority control circuit 405 and is connected to LED lamp group 5 through illumination control circuit 406 and noncontacting switch 408, is also connected to current foldback circuit 407 between LED lamp group 5 and illumination control circuit 406.

Fig. 3 is the circuit theory diagrams of reverse-connection preventing circuit 404 in the present embodiment, has FET, the indirect Zener diode of the grid of FET, source electrode, drain electrode, the indirect diode of source electrode, grounded drain, grid connecting resistance.Be input as example with solar energy, when the access of input both positive and negative polarity is correct, electric current is from positive pole through resistance SR0 and Zener diode SD0, and diode flows back into power cathode, thus forms forward voltage between scene effect pipe SQ9 grid, source electrode, makes FET SQ9 conducting; Input both positive and negative polarity connects inverse time; oppositely cut-off state is in because FET SQ9 and diode are in; thus scene effect pipe SR0 and Zener diode SD0 can not form normal current; therefore FET SQ9 is in reverse blocking state, thus protects late-class circuit and achieve anti-reverse function.

Fig. 4 is the circuit theory diagrams of priority control circuit 405 of powering in embodiment.Described power supply priority control circuit 405 comprises sun-generated electric power signal sample circuit, battery feed signal sample circuit, stagnant chain rate compared with circuit I and stagnant chain rate comparatively circuit I I.

One, sun-generated electric power signal sample circuit comprises resistance SR1, SR2, SR2' and electric capacity SC1, the in parallel and one end ground connection of resistance SR2, SR2' and electric capacity SC1, and the other end connects power supply through resistance SR1; Described stagnant chain rate comparatively circuit I by resistance SR3, SR4, SR5, adjustable resistor SRP and operational amplifier A R1(LM358) form, solar-electricity source signal sample magnitude of voltage is accessed by operational amplifier A R1 reverse input end; Operational amplifier A R1 output is connected to the base stage of triode SQ1 through resistance SR6, triode SQ1 is respectively through resistance SR10, SR9, SR8 connecting triode SQ4, SQ3, SQ2 base stage, wherein triode SQ2 colelctor electrode is through optocoupler SU1 connecting triode SQ7, SQ8 base stage, triode SQ7, SQ8 emitter stage jointly through resistance SR15 to FET SQ5, SQ6 grid.

When the non-inverting input of solar-electricity source signal sample magnitude of voltage (access of operational amplifier A R1 reverse input end) higher than operational amplifier A R1 (solar panel can effectively be powered), operational amplifier A R1 output low level, triode SQ1 is made to be in cut-off state through resistance SR6 to the base stage of triode SQ1, and by resistance SR7 more respectively through resistance SR8, SR9, SR10 makes triode SQ2, SQ3, SQ4 conducting, through resistance SR12 after triode SQ2 conducting, optocoupler SU1, resistance SR13 makes triode SQ7 conducting, again by resistance SR15 to FET SQ5, the grid of SQ6, thus give FET SQ5, forward bias voltage is produced between the grid source of SQ6, thus make FET SQ5, the electronic switch main device of SQ6(solar cell) conducting simultaneously.Because now triode SQ3, SQ4 is conducting, triode BQ2, AQ1 is made to be in cut-off state, thus make the electronic switch main device of FET BQ5, BQ6(battery) grid source between can not get forward bias voltage and can not conducting, and the electronic switch main device of FET AQ4, AQ5(AC/DC stand-by power supply 3) grid source between can not get forward bias voltage and can not conducting.

When the non-inverting input of solar-electricity source signal sample magnitude of voltage (operational amplifier A R1 reverse input end) lower than AR1 (solar panel can not effectively be powered), operational amplifier A R1 exports high level, triode SQ1 is made to be in conducting state through resistance SR6 to the base stage of triode SQ1, cause triode SQ2, SQ3, SQ4 cut-off, thus make FET SQ5, SQ6 be in cut-off state, namely cut off the supply access of solar energy.

Two, battery feed signal sample circuit is identical with sun-generated electric power signal sample circuit, stagnant chain rate is identical compared with circuit I with stagnant chain rate compared with circuit I I, stagnant chain rate compared with circuit I I output through the base stage of resistance BR6 to triode BQ1, triode BQ1 colelctor electrode is respectively through resistance BR9, BR8 connecting triode BQ8, BQ2 base stage, wherein triode BQ2 base stage is connected with triode SQ4 colelctor electrode, triode BQ2 colelctor electrode through optocoupler BU1 connecting triode BQ3, BQ4 base stage, triode BQ3, BQ4 emitter stage jointly through resistance BR14 to FET BQ5, BQ6 grid.

When storage battery source signal sample magnitude of voltage (access of operational amplifier A R2 reverse input end) is higher than operational amplifier A R2(model LM358) non-inverting input time (battery is effectively powered), operational amplifier A R2 output low level, triode BQ1 is made to be in cut-off state through resistance BR6 to the base stage of triode BQ1, and by resistance BR7 more respectively through resistance BR9, make triode BQ8 conducting and cause triode AQ1 and end; Only when triode SQ4 is in cut-off (when solar energy can not effectively be powered), triode BQ2 conducting is made by resistance BR7, BR8, through resistance BR11 after triode BQ2 conducting, optocoupler BU1, resistance BR12 makes triode BQ3 conducting, again by the grid of resistance BR14 to FET BQ5, BQ6, thus produce forward bias voltage between the grid source of FET BQ5, BQ6, and make the electronic switch main device of FET BQ5, BQ6(batteries) conducting simultaneously.

When the non-inverting input of storage battery source signal sample magnitude of voltage (operational amplifier A R2 reverse input end) lower than operational amplifier A R2 (battery can not effectively be powered), operational amplifier A R2 exports high level, triode BQ1 is made to be in conducting state through resistance BR6 to the base stage of triode BQ1, cause triode BQ2, BQ8 cut-off, thus make FET BQ5, BQ6 be in cut-off state, namely cut off the supply access of battery.

Three, in this example, triode BQ8, SQ3 colelctor electrode is connected to triode AQ1 base stage, triode AQ1 colelctor electrode through optocoupler AU1 connecting triode AQ3, AQ2 base stage, triode AQ3, AQ2 emitter stage jointly through resistance AR6 to FET AQ5, AQ4 grid.

Only when triode BQ8, SQ3 end simultaneously (when solar cell and battery all can not effectively be powered), triode AQ1 conducting is just made through resistance AR1, again through resistance AR3, optocoupler AU1, resistance AR4, triode AQ2 and the resistance AR6 grid to FET AQ4, AQ5, thus produce forward bias voltage between the grid source of FET AQ4, AQ5, and make the electronic switch main device of FET AQ4, AQ5(accessory power supply group) conducting simultaneously.

As shown in Figure 5, the circuit theory diagrams of illumination control circuit 406 in the present embodiment.Illumination control circuit 406 has MCU(model AT89C2051), MCU is electrically connected with two controlling brancher, two controlling brancher control section LED lamp group 5 respectively.The P3.5 of MCU is connected to triode 1Q2 base stage through resistance 1R11, triode 1Q2 collector connecting transistor 1Q3 base stage, triode 1Q3 colelctor electrode connecting triode 1Q4,1Q5 base stage, triode 1Q4,1Q5 emitter stage connects the grid (No. 1 tunnel) of FET 1Q1 jointly through resistance 1R16; The P3.7 of MCU have the circuit (No. 2 tunnel) identical with on P3.5.

MCU can adjust power output according to the needs of lighting environment, when night, rare people is movable, illumination can enter power save mode, reduces power output, and system takes power to reduce by half output, enter certain period, issue power output by MCU to reduce by half instruction being controlled at output port, and maintain this half-power and export until next recovers period, export control and management and be adjusted to total power output state, effectively can extend the power-on time of battery like this, and reach the effect of energy-saving low-carbon.

In this example, MCU controls the output state of No. 1 road and No. 2 according to system time:

When system time is when 06:00---22:00 is interval, No. 1 road and 2 tunnels export (conducting);

When system time is when 22:00---02:00 is interval, No. 1 tunnel exports (conducting), and (cut-off) is closed on No. 2 tunnels;

When system time is when 02:00---06:00 is interval, No. 2 tunnels export (conducting), and (cut-off) is closed on No. 1 tunnel.

No. 1 tunnel exports: when the I/O port of the P3.5 of MCU exports high level, triode 1Q2 conducting is made through resistance 1R11,1R12, then triode 1Q3 is made to end, triode 1Q4 conducting is made through resistance 1R14,1R15, triode 1Q5 ends, again through resistance 1R16,1R17 grid to FET 1Q1, thus the voltage obtaining forward between the grid source electrode of FET 1Q1 is made to make the complete conducting of FET 1Q1; When the I/O port output low level of the P3.5 of MCU, then FET 1Q1 is in cut-off state.

No. 2 tunnels export: when the I/O port of the P3.7 of MCU exports high level, triode 2Q2 conducting is made through resistance 2R11,2R12, then triode 2Q3 is made to end, triode 2Q4 conducting is made through resistance 2R14,2R15, triode 2Q5 ends, again through resistance 2R16,2R17 grid to FET 2Q1, thus the voltage obtaining forward between the grid source electrode of FET 2Q1 is made to make the complete conducting of FET 2Q1; When the I/O port output low level of the P3.7 of MCU, then FET 2Q1 is in cut-off state.

Influential system safety when breaking down for preventing LED lamp group 5, two controlling brancher of illumination control circuit 406 is all connected to current foldback circuit 407(and sees Fig. 6).

No. 1 road current foldback circuit: when flowing through certain electric current of FET 1QS; the magnitude of voltage of answering can be produced between the drain-source of scene effect pipe 1QS; after resistance 1R1 amplifies to the proportional amplifier that is made up of resistance 1R1,1R3 and operational amplifier 1U1A, then pass to the non-inverting input of comparator 1U1B through resistance 1R4,1R5 dividing potential drop and reference data compares process.When electric current serious offense setting value, after the reference data voltage that the voltage signal serious offense of the correspondence be exaggerated is corresponding, comparator 1U1B exports high level, the non-inverting input of comparator 1U1B is passed to again through diode 1D2 and resistance 1R8, force the non-inverting input of comparator 1U1B always higher than the reverse input end of comparator 1U1B, thus realize overcurrent self-locking function; Can by unlocking by touch-switch S1 once be in self-locking state.No. 2 road current foldback circuit principles are with No. 1 tunnel.

Fig. 7 is the voltage source in embodiment used by system controller.Solar cell 1, battery 2 and AC/DC stand-by power supply 3 access and change and transfer system controller 4 voltage source used to.By voltage-stablizer PU3, PU4(78LXX) and isolation DC/DC power supply (PKV3321) produce 12V, 5V voltage.The circuit be made up of TL431 chip produces 2.5V voltage.

Solar cell array design in this example

Solar module serial number Ns:

Ns=UR/Uoc=(Uf+UD+Uc)/Uoc

In formula: UR is that solar cell array exports minimum voltage; Uoc is the optimum operating voltage of solar module; Uf is battery float charge voltage; UD is diode drop; UC is the pressure drop that other factors cause.

Solar module number Np in parallel:

Np=(Bcb+Nw×QL)/(Qp×Nw)

In formula: Bcb is the accumulator capacity that need supplement; Nw two groups the longest overcast and rainy continuously between the shortest interval number of days; Qp is solar module daily generation.

Solar cell array power P:

P=Po×Ns×Np(W)

In formula: Po is the rated power of battery component.Ns is serial number, and Np is number in parallel.

Battery group capacity design in the present embodiment

It is very important that the capacity of battery is powered continuously to guarantee.The deficiency of square formation generated energy and superfluous value are one of foundations determining accumulator capacity.Accumulator capacity BC computing formula is:

BC=A×QL×NL×TO/CC(Ah)

In formula: A is safety coefficient, get between 1.1 ~ 1.4; QL is the per day power consumption of load, for operating current is multiplied by a day hours worked; NL is the longest continuous overcast and rainy days; TO is temperature correction coefficient, generally more than 0 DEG C, gets 1; CC is the battery discharging degree of depth.

MPPT (MPPT maximum power point tracking) controller, namely refers to that controller can detect the generating voltage of solar panels in real time, and follows the trail of ceiling voltage current value (VI), make system with the highest efficiency to charge in batteries.Because the maximum power point (mpp) of photovoltaic cell is with light intensity and variations in temperature.The tracking of maximum power point is actually one from searching process.By the detection to photovoltaic cell current output voltage and electric current, obtain current the output power from photovoltaic cells, then compared with the previous moment photovoltaic power stored, give up and littlely deposit large, then detect, compare again.So ceaselessly go round and begin again, photovoltaic cell just can be made dynamically to be operated on maximum power point.

MPPT principle used in the present embodiment: the impact being subject to the many factors such as light intensity, temperature, angle of incidence of sunlight due to photovoltaic cell component, its output voltage output current and internal resistance are in and do not stop in change, MPPT maximum power point tracking is by the detection to photovoltaic cell current output voltage and electric current, current charge power is obtained after being multiplied, compared with the charge power of previous moment, regulate the dutycycle of PWM, thus make photovoltaic cell always work in maximum power point.

Be illustrated in figure 8 MPPT solar charging electrical schematic diagram.In figure, microcontroller adopts the routine microprocessor of MC68 system (here actual employing MC68HC08SR12), uses A/D module through voltage x current sample circuit, thus regulates the control end PWM dutycycle of T, realize the maximum power output of photovoltaic cell.

Claims (7)

1. a solar powered energy efficient lighting system, there is solar cell (1), battery (2), AC/DC stand-by power supply (3) and LED lamp group (5), it is characterized in that: described solar cell (1), battery (2) are all connected LED lamp group (5) through system controller (4) with AC/DC stand-by power supply (3), and described system controller (4) comprising:
Charge management module, controls solar cell (1) for battery (2) charging, when solar cell (1) is directly LED lamp group (5) power supply, is stored in by unnecessary electricity in battery (2);
Power supply preferred module, for at solar cell (1), switch the power supply of powering to LED lamp group (5) between battery (2) and AC/DC stand-by power supply (3) three, solar cell (1) power supply is preferential, secondly powered by battery (2), when both cannot effectively power, start AC/DC stand-by power supply (3) power supply;
Lighting control module, for controlling LED lamp group (5) power output;
Described power supply preferred module comprises reverse-connection preventing circuit (404) and power supply priority control circuit (405), and solar cell (1), battery (2) and AC/DC stand-by power supply (3) are connected to power supply priority control circuit (405) through reverse-connection preventing circuit (404) respectively;
Described power supply priority control circuit (405) comprises sun-generated electric power signal sample circuit, battery feed signal sample circuit, stagnant chain rate compared with circuit I and stagnant chain rate comparatively circuit I I, sun-generated electric power signal sample circuit sampling solar cell (1) power supply signal, through stagnant chain rate comparatively circuit I judge whether effectively to power, as can not then starting storage battery power signal sampling circuit sampling battery (2) power supply signal, through stagnant chain rate comparatively circuit I I judge whether effectively to power, as can not then start AC/DC stand-by power supply (3) power supply;
Described sun-generated electric power signal sample circuit comprises resistance SR1, SR2, SR2' and electric capacity SC1, the in parallel and one end ground connection of resistance SR2, SR2' and electric capacity SC1, and the other end connects power supply through resistance SR1; Described stagnant chain rate comparatively circuit I is made up of resistance SR3, SR4, SR5, adjustable resistor SRP and operational amplifier A R1, and solar-electricity source signal sample magnitude of voltage is accessed by operational amplifier A R1 reverse input end; Operational amplifier A R1 output is connected to the base stage of triode SQ1 through resistance SR6, triode SQ1 is respectively through resistance SR10, SR9, SR8 connecting triode SQ4, SQ3, SQ2 base stage, wherein triode SQ2 colelctor electrode is through optocoupler SU1 connecting triode SQ7, SQ8 base stage, triode SQ7, SQ8 emitter stage jointly through resistance SR15 to FET SQ5, SQ6 grid;
Described battery feed signal sample circuit is identical with sun-generated electric power signal sample circuit, stagnant chain rate is identical compared with circuit I with stagnant chain rate compared with circuit I I, stagnant chain rate compared with circuit I I output through the base stage of resistance BR6 to triode BQ1, triode BQ1 colelctor electrode is respectively through resistance BR9, BR8 connecting triode BQ8, BQ2 base stage, wherein triode BQ2 base stage is connected with triode SQ4 colelctor electrode, triode BQ2 colelctor electrode through optocoupler BU1 connecting triode BQ3, BQ4 base stage, triode BQ3, BQ4 emitter stage jointly through resistance BR14 to FET BQ5, BQ6 grid;
Described triode BQ8, SQ3 colelctor electrode is connected to triode AQ1 base stage, triode AQ1 colelctor electrode through optocoupler AU1 connecting triode AQ3, AQ2 base stage, triode AQ3, AQ2 emitter stage jointly through resistance AR6 to FET AQ5, AQ4 grid.
2. solar powered energy efficient lighting system according to claim 1; it is characterized in that: described charge management module comprises MPPT(403); solar cell (1) is through MPPT(403) connect battery (2), battery (2) was also connected to, low-voltage protection circuit (401) and temperature protection circuit (402).
3. solar powered energy efficient lighting system according to claim 1; it is characterized in that: described lighting control module has noncontacting switch (408); and control illumination control circuit (406) and the time switch (409) of noncontacting switch (408) break-make; described power supply priority control circuit (405) is connected to LED lamp group (5) through illumination control circuit (406) and noncontacting switch (408), is also connected to current foldback circuit (407) between LED lamp group (5) and illumination control circuit (406).
4. solar powered energy efficient lighting system according to claim 1, it is characterized in that: described reverse-connection preventing circuit (404) has FET, the indirect Zener diode of the grid of FET, source electrode, drain electrode, the indirect diode of source electrode, source ground, grid connecting resistance.
5. solar powered energy efficient lighting system according to claim 3, it is characterized in that: described illumination control circuit (406) has MCU, MCU is electrically connected with two controlling brancher, article two, controlling brancher control section LED lamp group (5) respectively, MCU controls the output state of two controlling brancher respectively according to system time.
6. solar powered energy efficient lighting system according to claim 3; it is characterized in that: described current foldback circuit (407) has proportional amplifier and comparator; proportional amplifier output connects comparator non-inverting input; comparator output terminal is connected to comparator non-inverting input through diode and resistance, and comparator non-inverting input is through touch-switch ground connection.
7. solar powered energy efficient lighting system according to claim 5, it is characterized in that: the P3.5 of described MCU is connected to triode 1Q2 base stage through resistance 1R11, triode 1Q2 collector connecting transistor 1Q3 base stage, triode 1Q3 colelctor electrode connecting triode 1Q4,1Q5 base stage, triode 1Q4,1Q5 emitter stage connects the grid of FET 1Q1 jointly through resistance 1R16; The P3.7 of described MCU have the circuit identical with on P3.5.
CN201210435096.5A 2012-11-02 2012-11-02 Solar power supplied energy-saving illumination system CN102913839B (en)

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