CN201137854Y - Electroluminescence and solar energy technology combined application system - Google Patents

Abstract

The utility model discloses a system combined the electroluminescence and the solar technique is invented through aiming at solving problems of the prior art of heavy energy consumption and the like. The system combined the electroluminescence and the solar technique is composed of a controller, a solar cell component, an accumulator group and an electroluminescent signboard, wherein the solar cell component, the accumulator group and the electroluminescent signboard are respectively connected with the controller. The system adopts the above structure and takes the commercial power as a power source, thereby the automatic switch between the solar energy and the commercial power can be realized, and the adjustable brightness of an EL chip is realized. Power is generated by the solar cell in daylight, the accumulator is charged through a micro-computer controller, the power of an EL signboard is supplied through converting a direct current into an alternating current by a DC/AC converter, when the power is insufficient, and the system automatically switches to a conventional power to supply power to the EL signboard.

Description

A kind of electroluminescent combines application system with heliotechnics

Technical field

The utility model relates to the solar photovoltaic technology application, refers more particularly to heliotechnics and combines with the electroluminescent technology.

Background technology

The purpose of this utility model provides a kind of using energy source system based on solar energy, and heliotechnics is combined with the electroluminescent technology, develops the environment-friendly energy-saving system, is convenient to applying of this technology.Solar energy is a kind of cleaning, inexhaustible regenerative resource resource, can not pollute environment.

China's photovoltaic industry also is in the starting stage, and development speed also lags behind the demand of domestic market development simultaneously well below developed country.According to calculating; If conversion of solar energy is 15% for the efficient of electricity, every square metre area can provide about 0.036 kilowatt electric energy, and it is per day to provide about 0.41 kilowatt-hour electric energy.

Electroluminescent sheet adopts electroluminescent (electroluminescent english abbreviation EL) principle, and it is a class physics luminescence phenomenon that electric energy directly is converted to luminous energy.It loads alternating voltage by being added between two electrodes of El element, and under certain frequency, excitation light-emitting material produces visible light.Plane electric fields photoluminescence (EL) technical research originates from 30 years, the sixties its enter the research period of great prosperity, initial order ground is for developing ultrathin display spare or TV.The eighties EL in mid-term luminescent device at home and abroad begins progressively to apply in the high-tech electronic product, as is used for liquid crystal back illumination, aircraft and automobile instrument etc.

China in the sixties based on Changchun Research Inst. of Physics, Chinese Academy of Sciences, the formal establishment begins system research and exploitation to this work, present stage China's correlation technique ground development, changes and all carries out on the basis.Nineteen eighty-two, Chinese Academy of Sciences Changchun physics successfully developed 4 * 4 meter matrix form super-large size plastic luminescent screens, and in Beijing Great Hall of the People hall suspension applications 10 years.Middle nineteen nineties, China's El element progressively began to enter civil area, simultaneously with its also fast development of relevant supporting electric drive part, produce at present and market all very ripe.

The utility model content

For overcoming above-mentioned defective, the purpose of this utility model is to provide the electroluminescent of a kind of energy savings, non-environmental-pollution to combine application system with heliotechnics.

For achieving the above object, the utility model electroluminescent combines application system with heliotechnics, is made up of controller and the solar module that is connected with controller respectively, batteries, electroluminescent direction board.

Further, above-mentioned controller by CPU, discharge and recharge control module, DC/AC converting unit and respectively the civil power converting unit form; Wherein,

The charge and discharge control module links to each other with solar module, CPU and batteries respectively, is used for controlling under the control of CPU discharging and recharging of batteries;

The DC/AC converting unit links to each other with CPU, batteries and electroluminescent direction board respectively, is used for carrying out under the control of CPU the DC/AC conversion, and provides electric energy to the electroluminescent direction board;

The civil power converting unit is used for carrying out civil power and solar powered conversion under the control of CPPU.

Further, also comprise the sine wave pulse width modulated circuit, be connected between DC/AC converting unit and the CPU.

Wherein, above-mentioned charge and discharge control module specifically comprises:

The BUCK circuit is arranged between solar energy energy battery and the batteries, as the charging main circuit; Charging control circuit, by the peak power point control circuit, the PWM pulse-width modulation circuit, DC voltage control and intelligent accummulator control circuit are formed;

Wherein, the peak power point control circuit is in order to the electric current and the voltage of monitoring solar cell output, and exports relevant information to the PWM pulse-width modulation circuit by dc voltage control circuit; The intelligent accummulator control circuit is in order to the electric current and the voltage of monitoring batteries, and exports relevant information to the PWM pulse-width modulation circuit; The PWM pulse-width modulation circuit is in order to carry out resistance conversion according to relevant information to the BUCK circuit.

Wherein, above-mentioned BUCK circuit comprises: input capacitance: be connected to described solar module output by inserting switch; Metal-oxide-semiconductor: its control end links to each other in the output of described PWM pulse-width modulation circuit, and all the other two ends respectively over the ground and connect the diode of an above-mentioned input capacitance and a reversal connection; Output filter capacitor: with batteries and connect, connect the negative pole of described diode simultaneously again through a filter inductance.

Adopting such scheme, is stand-by power source with the civil power, can realize that solar energy and civil power automatically switch.Daytime, solar cell power generation charged a battery by microcomputer controller, and when power shortage, system automaticallyed switch and electric power was provided for the EL direction board by conventional electric power by the DC/AC conversion direct current being become interchange to the power supply of EL direction board evening.In case after battery charge returned to setting value, system switched to solar powered again.Such scheme integrates controller, conventional electric power commutation circuit becomes a system, be convenient to installation, the maintenance of system, adopt MPPT maximum power point tracking (MPPT) technology, make battery component remain peak power output, whole system efficient is increased substantially, reduced the cost of system.Be the power supply of electroluminescent direction board by solar energy, more help large tracts of land and promote.

Description of drawings

Fig. 1 is that the utility model electroluminescent combines application system basic principle figure with heliotechnics.

Fig. 2 is the utility model electroluminescent combines the application system middle controller with heliotechnics a schematic diagram.

Fig. 3 is the circuit structure diagram of charge and discharge control circuit among Fig. 2.

Fig. 4 is the schematic diagram of SWPM circuit.

Fig. 5 is the working waveform figure of SWPM circuit.

The specific embodiment.

The utility model is further described below in conjunction with drawings and Examples.

As shown in Figure 1-Figure 3, the utility model adopts following system to form: solar module (installing on the solar battery bracket), distribution box, controller, battery, EL direction board etc.

The effect of solar panel: specification is from 5W to 300W, and offer the electric current of charge in batteries by opto-electronic conversion daytime,

The effect of solar-cell panel support: the self-contained battery plate is 45 degree towards southern angle of inclination; The effect of distribution box: fixedly microcomputer controller and battery, waterproof, protection against electric shock;

The effect of microcomputer controller: the control charging and discharging of accumulator, charging must not surpass 1.3 times of its rated voltage, and discharge must not surpass 70% of its rated capacity; Solar powered when sufficient, be the power supply of EL direction board by solar energy; When solar powered deficiency, automatically switch by system, be the power supply of EL direction board by conventional civil power.In case battery charge is behind the recovery normal value, system switches to solar powered again, protects the discharge requirement of battery greatly, prolongs the service life of battery.

The whole system Automatic Control, light, time control are opened, and light, time control are closed, and need not manually-operated, and be easy to use, has high economic benefit.

Charging circuit has constituted the utility model major loop part, cooperates solar cell and energy storage battery work.It should realize the peak power output (being MPPT) of solar cell, again battery is carried out the charging of minimal losses pattern, is the crucial link of whole system.Carry out theory analysis and Computer Simulation by main circuit, chosen the BUCK circuit as the charging circuit form after relatively various topologys.

Its theory diagram is Fig. 3.The major function advantage of charging circuit is: with voltage, the capacitance grade coupling of solar cell, battery, reliable and stable work when guaranteeing charging; The charging major loop structure can adapt to the control needs, adopts the BUCK circuit, the convenient MPPT maximum power point tracking that realizes solar cell; High efficiency, low-loss.

EL drives and adopts SPWM control, by the external adjustable element of chip, can change the frequency size. also just change brightness; ) effect of battery: rated voltage 12V or 24V, be operated in charging and discharging state by microcomputer controller, the effect of EL: display font, pattern, power consumption only is equivalent to 10% of the fluorescent tube of homalographic illumination, the EL direction board is widely applied to fields such as outdoor advertising, lamp box, can significantly reduce power consumption.With solar photovoltaic technology and the combination of EL electroluminescent technology, can reduce the consumption of common electric energy significantly.

Shown in Figure 1, daytime, solar cell power generation charged a battery by microcomputer controller, and when power shortage, system automaticallyed switch and electric power was provided for the EL direction board by conventional electric power by the DC/AC conversion direct current being become interchange to the power supply of EL direction board evening.In case after battery charge returned to setting value, system switched to solar powered again;

Fig. 2 is controller principle figure of the present utility model, the maximum power point MPPT control that independent photovoltaic generating system is used in the illustrated embodiment, and the EL direction board drives and adopts SPWM control.

Controller is by regulating the BUCK circuit drives dutycycle as the electric energy conversion links, reach the purpose of adjusting photovoltaic array output load characteristic, thereby realize MPPT control. this control algolithm biggest advantage, be when intensity of illumination takes place to change fast, the photovoltaic array output voltage can be followed the tracks of it in mode stably and change, and the vibration of stable state is also smaller.

The maximum power point tracing method that independent photovoltaic generating system is used, this method contains following steps successively:

Step 1: as this MPPT maximum power point tracking controller, detect the output voltage V n of solar cell photovoltaic array, electric current I n with microprocessor;

Step 2: the difference dV of the output voltage sampled value Vb of a microprocessor judges current output voltage Vn and a last control cycle: if dV=0 then: the difference dI that judges the output current sampled value Ib of a current output current In and a last control cycle; If dV ≠ 0 item: judge whether dI/dV equals-I/V

Step 3: according to the judged result of step 2:

If dI=0

Then: Vb=Vn, Ib=In finishes

If dI/dV=-I/V

Then; Vb=Vn, Ib=In finishes

Step 4: according to the judged result of step 3:

If dI ≠ 0

Then: judge that dI＞0 is not

If: dI/dV ≠-I/V

Then: judgement dI/dV＞-I/V is not

Step 5: according to the judged result of step 4:

If dI＞0

Then: microprocessor controlling party wave generation circuit and the width-modulation pulse of connecting with this circuit form circuit, and produce the dutycycle that width-modulation pulse removes to reduce the BUCK circuit that is connected the output of solar cell photovoltaic array, and make Vb=Vn, Ib=In, finish:

If dI/dV＞-I/V,

Then: microprocessor reduces dutycycle by the method for described step 5, makes Vb=Vn, and Ib=In finishes:

If dI＜0,

Then: microprocessor increases dutycycle by the side of described step 5, makes Vb=Vn, and Ib=In finishes:

If: dI/dV＜-the I/V method

Then: microprocessor increases dutycycle by the side of described step 5, makes Vb=Vn, and Ib=In finishes:

The BUCK circuit comprises: input capacitance: be connected to described solar module output by inserting switch; Metal-oxide-semiconductor: its control end links to each other in the output of described PWM pulse-width modulation circuit, and all the other two ends respectively over the ground and connect the diode of an above-mentioned input capacitance and a reversal connection; Output filter capacitor: with batteries and connect, connect the negative pole of described diode simultaneously again through a filter inductance.

Fig. 4 is the SPWM circuit theory, and Fig. 5 is its working waveform figure.In order to satisfy the complementation work of two switches in the left and right arms converter, adopted the irregular modulation method of left and right arms phase place.Promptly adopt two phase places phases identical sinusoidal modulation wave of amplitude on the contrary, compare with a carrier wave triangular wave, obtain two opposite second order SPWM ripples of phase place and remove to control respectively the left and right arms converter, on capacitor C 1 and C2, obtain voltage ua and ub respectively, can obtain the three rank SPWM output voltages of voltage uL with ua-ub.Left arm C1 goes up voltage ua and is produced by S1 and S1, and right arm C2 goes up voltage ub and produced by S2 and S2, about two arm converters be operated in complementary state.When the dutycycle of left arm was D, the dutycycle of right arm then was D=1-D.

For left arm, the complementary work of switch S 1 and S1, modulating wave is that u=sin ω (kTc+p) is a positive phase, the equation of sampled point a and b is

Dutycycle

For right arm, the complementary work of switch S 2 and S2, modulating wave for-u=-sin ω (kTc+p) is an antiphase, the equation of sampled point a ' and b ' is

Dutycycle

Then

The dutycycle of two arm converters satisfies D=1-D about this explanation, and two arms also are operated in complementary state each other.The value of dutycycle D should be determined by M.When the value of known US and UL, $M=\sqrt{2}\mathrm{UL}/\mathrm{US},$ Find the value of the dutycycle D corresponding with M by Fig. 5 curve.The operation interval of D is (1-D)～D.By Fig. 5 and document as can be known

Adopt SPWM control method, have littler harmonic content.

In summary,, realized centralized Control, strengthened stability because this cover system uses a lot of new technologies. promote for complete equipment and established reliability.

Claims (5)

1, a kind of electroluminescent combines application system with heliotechnics, it is characterized in that: be made up of controller and the solar module that is connected with controller respectively, batteries, electroluminescent direction board.

2, electroluminescent as claimed in claim 1 combines application system with heliotechnics, it is characterized in that: described controller by CPU, discharge and recharge control module, DC/AC converting unit and respectively the civil power converting unit form; Wherein,

The charge and discharge control module links to each other with solar module, CPU and batteries respectively, is used for controlling under the control of CPU discharging and recharging of batteries;

The DC/AC converting unit links to each other with CPU, batteries and electroluminescent direction board respectively, is used for carrying out under the control of CPU the DC/AC conversion, and provides electric energy to the electroluminescent direction board;

The civil power converting unit is used for carrying out civil power and solar powered conversion under the control of CPPU.

3, electroluminescent as claimed in claim 2 combines application system with heliotechnics, it is characterized in that: also comprise the sine wave pulse width modulated circuit, be connected between DC/AC converting unit and the CPU.

4, combine application system as claim 2 or 3 described electroluminescents with heliotechnics, it is characterized in that: described charge and discharge control module specifically comprises:

The BUCK circuit is arranged between solar energy energy battery and the batteries, as the charging main circuit; Charging control circuit, by the peak power point control circuit, the PWM pulse-width modulation circuit, DC voltage control and intelligent accummulator control circuit are formed;

Wherein, the peak power point control circuit is in order to the electric current and the voltage of monitoring solar cell output, and exports relevant information to the PWM pulse-width modulation circuit by dc voltage control circuit; The intelligent accummulator control circuit is in order to the electric current and the voltage of monitoring batteries, and exports relevant information to the PWM pulse-width modulation circuit; The PWM pulse-width modulation circuit is in order to carry out resistance conversion according to relevant information to the BUCK circuit.

5, electroluminescent as claimed in claim 4 combines application system with heliotechnics, it is characterized in that: described BUCK circuit comprises:

Input capacitance: be connected to described solar module output by inserting switch;

Metal-oxide-semiconductor: its control end links to each other in the output of described PWM pulse-width modulation circuit, and all the other two ends respectively over the ground and connect the diode of an above-mentioned input capacitance and a reversal connection;

Output filter capacitor: with batteries and connect, connect the negative pole of described diode simultaneously again through a filter inductance.

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