CN201041953Y - A solar power supply conversion circuit - Google Patents

A solar power supply conversion circuit Download PDF

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Publication number
CN201041953Y
CN201041953Y CNU2007201438108U CN200720143810U CN201041953Y CN 201041953 Y CN201041953 Y CN 201041953Y CN U2007201438108 U CNU2007201438108 U CN U2007201438108U CN 200720143810 U CN200720143810 U CN 200720143810U CN 201041953 Y CN201041953 Y CN 201041953Y
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CN
China
Prior art keywords
voltage
solar
output
unit
switching circuit
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CNU2007201438108U
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Chinese (zh)
Inventor
袁炜初
李荐
张仕财
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东莞市特龙金科能源科技有限公司
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Priority to CNU2007201438108U priority Critical patent/CN201041953Y/en
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Publication of CN201041953Y publication Critical patent/CN201041953Y/en

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Abstract

The utility model relates to a solar energy power switching circuit, consisting of a super capacitance module connected between the anode input end of the switching circuit and the cathode input end of the switching circuit and a voltage-detecting unit connected between the anode as well as the cathode of the switching circuit. The voltage-detecting unit detects the voltage of the super capacitance module and controls the on and off of the switch device unit, causes the DC/DC converting unit connected following the voltage-detecting unit to work after being electrified, and charges the energy-storing battery connected following the DC/DC converting unit. The switching circuit of the utility model can be connected with the solar energy converting device through a diode. Almost all the solar energy converted by the solar energy converting device can be stored up by the super capacitance module and then restored up in the energy-storing battery; and thereby, the conversion efficiency can reach over 90 percent.

Description

A kind of solar-electricity power-switching circuit

Technical field

The utility model relates to the solar cell energy storage technologies, also relates to the voltage detecting circuit control switch, particularly is the solar energy memory circuit of the impedance matching element of switch transition with the ultracapacitor.

Background technology

Along with the anxiety of global energy, solar cell obtains extensive studies and development.Solar cell can not produce electric energy when having sunlight, for satisfying the lasting demand of electrical appliance, and must be with the power storage (as various secondary cells such as lithium ion battery, lead-acid battery, Ni-MH battery, nickel-cadmium cells) in energy storage device of solar cell.Because solar cell itself is the efficient not high (being generally less than 20%) of electric energy with transform light energy, add that present solar cell is also comparatively expensive, therefore with the electric energy effective conversion storage of solar cell output, be that nearly all solar power supply system is all in the index of making great efforts to improve.

Initial solar energy storage mode is: solar cell is in parallel with secondary cell by diode, and the electric energy of solar cell directly is stored in the secondary cell.But when light intensity changed, marked change all can take place in the voltage and the impedance of solar cell output; When light is more weak, the voltage of solar cell output is lower, just can not continue when voltage is lower than the voltage of battery to secondary cell charge, this moment, the electric energy of solar cell was wasted, and therefore this energy storage mode efficient directly that solar cell is in parallel with secondary cell is lower.

Chinese invention patent ZL95106136.4 has proposed a kind of electric energy with solar cell output and directly has been stored in scheme in the double electric layer capacitor, and in this scheme, double electric layer capacitor uses as secondary cell.This scheme can only be exported the electric energy in the double electric layer capacitor off and on by discharge controller to load, be shorter than the charging interval of solar cell its discharge time to double electric layer capacitor, owing to the finite capacity of double layer capacitor, can't satisfy the big capacity storage of solar cell electric energy; Again because in the discharge process, the voltage at double electric layer capacitor two ends is linear declines, therefore can't satisfy the demand of load to constant voltage.

CN1185584A discloses the technical scheme of a kind of " testing circuit of maximum power point " by name, in this scheme, to the testing circuit that the maximum power point that changes with sunlight intensity that incides solar cell and peripheral temperature is followed the trail of, control the operating state of subsequent conditioning circuit according to testing result.But this circuit is less in light intensity, when the solar cell power output is low, can't make subsequent conditioning circuit conversion storage, so its efficient is still not high, and this circuit is comparatively complicated.

Propose to set up the technical scheme of an other independent battery in the United States Patent (USP) 4873480, this scheme produces reference voltage by independent battery, this reference voltage and solar cell output voltage are compared, control the operating state of subsequent conditioning circuit according to comparative result.But its existing problems: because sunlight intensity is constantly to change, cause output voltage, the impedance of solar cell constantly to change, therefore this circuit can not be at converting electrical energy under the full terms, and another independently battery must be arranged, in working for a long time, the performance change of this battery can influence the variation of voltage reference, and is difficult to guarantee that its circuit works in the peak efficiency state always.

In the technical scheme of United States Patent (USP) 4916382, utilize analog-to-digital conversion circuit that the output voltage and the output current of solar cell are converted to the corresponding digital data, utilize microprocessor to handle again, and according to result control transformation circuit working in the high conversion rate state, but this circuit complexity, cost height, and the low-power energy of solar cell output still can't utilize light intensity low the time.

By as can be seen above, mentioned several of prior art and above-mentioned patent are that the scheme of electric energy all exists a shortcoming that conversion efficiency is lower with solar energy converting.

The utility model content

For solving above-mentioned the deficiencies in the prior art part, the utility model proposes a kind of sun-generated electric power effective conversion storage scheme, this scheme adopts the buffer unit of ultracapacitor (double electric layer capacitor) as solar cell, can realize that to light intensity the low-power electrical energy of solar cell output when more weak changes efficiently, and it is stored in the secondary cell.

The know-why that realizes the utility model sun-generated electric power effective conversion storage scheme is: 1. earlier the electric energy of solar cell output is stored in super capacitor temporarily or by described super capacitor more than constituting in the super capacitor assembly by series, parallel, because ultracapacitor has low-leakage current, therefore faint electric energy also can effectively be stored; 2. along with the continuous storage of electric energy, the voltage at ultracapacitor two ends constantly rises, when the voltage at ultracapacitor two ends rises to set point (this voltage setting value has guaranteed that the DC/DC change-over circuit works in the effective conversion operating state), voltage detecting circuit output control signal, make the electronic switch conducting, the DC/DC change-over circuit is started working, and the output galvanic current is pressed the charging that is used for the secondary cell memory device; 3. along with the work of DC/DC change-over circuit is carried out, the voltage at ultracapacitor two ends descends gradually, when voltage drops to set point, the voltage detecting circuit upset, the control electronic switch turn-offs, and this moment, solar cell continued to repeat the above-mentioned course of work again to the ultracapacitor charging.Because the internal resistance of ultracapacitor is very low, has good power out-put characteristic, therefore can guarantees that the DC/DC change-over circuit works in the effective conversion operating state, thereby realize the effective conversion storage of solar cell output electric energy.

The utility model is realized by adopting following technical scheme:

Manufacture and design a kind of solar-electricity power-switching circuit, link to each other with the sun-generated electric power switching device, described circuit comprises electric energy buffer unit, TCU transfer control unit, driving control unit and DC/DC converter unit: wherein, the electric energy buffer unit, be connected between described change-over circuit input anode and the change-over circuit input cathode, in order to the electric energy after reception and the described solar energy conversion device conversion of buffer memory; Voltage detection unit, in parallel with described electric energy buffer unit, in order to detecting the voltage of described electric energy buffer unit, and according to detected magnitude of voltage, produce and the drive control signal of output control switch device cell break-make; The switching device unit, its controlled terminal receives described drive control signal, and input connects described change-over circuit input anode, and output connects described DC/DC converter unit; DC/DC converter unit, its input are connected between described switching device unit output and the described change-over circuit input cathode, and output is the output of solar-electricity power-switching circuit.

According to described solar-electricity power-switching circuit, described electric energy buffer unit is super capacitor device or the super capacitor assembly that is made of by series connection and/or combination in parallel a plurality of super capacitor devices.

According to described solar-electricity power-switching circuit, the two ends of described super capacitor device or super capacitor assembly are connected with the voltage-limiting protection assembly.

According to described solar-electricity power-switching circuit, described voltage detection unit comprises: detection module, in order to detect the voltage of described electric energy buffer unit; The drive control signal generation module according to detected magnitude of voltage, produces when this magnitude of voltage is higher than the high potential threshold value and is lower than the electronegative potential threshold value and the output drive control signal.

According to described solar-electricity power-switching circuit, described voltage detection unit is that voltage is screened device.

According to described solar-electricity power-switching circuit, what the switching device unit can be in MOS (field effect) pipe, IGBT (insulated gate bipolar power transistor), turn-off SCR, the relay is a kind of.

According to described solar-electricity power-switching circuit, described voltage detection unit also comprises: light-sensitive device, in order to detect the intensity of illuminance; The threshold setting module according to the testing result of illuminance intensity, is set high potential threshold value and electronegative potential threshold value.

According to described solar-electricity power-switching circuit, described change-over circuit input anode connects the sun-generated electric power switching device by crystal diode.

According to described solar-electricity power-switching circuit, the output of described DC/DC converter unit connects energy-storage battery.

According to described solar-electricity power-switching circuit, what described energy-storage battery can be in lithium ion battery, Ni-MH battery, nickel-cadmium cell, the lead-acid battery is a kind of.

Compared with prior art, as long as the utility model has at solar cell under the situation of output, no matter the size of output valve can be stored among the ultracapacitor, this point has guaranteed making full use of solar energy.After the store energy, detect the voltage at ultracapacitor two ends in real time with a voltage detection unit,, just in time open the switching device unit in case ultracapacitor institute electric energy stored can drive the work of DC/DC converter unit, give the power supply of DC/DC converter unit, make its work.The DC/DC converter unit is constant voltage output, is the energy-storage battery charging, for future use.As can be seen, the utility model efficient height, circuit is simple.

Description of drawings:

Fig. 1 is the functional-block diagram of a kind of solar-electricity power-switching circuit of the present utility model;

Fig. 2 is the electrical schematic diagram of one of voltage detection unit embodiment in a kind of solar-electricity power-switching circuit of the utility model;

Ultracapacitor two ends and connect the electrical schematic diagram of one of protection assembly embodiment in a kind of solar-electricity power-switching circuit of Fig. 3 the utility model;

Fig. 4 is two the electrical schematic diagram of voltage detection unit embodiment in a kind of solar-electricity power-switching circuit of the utility model.

Embodiment:

Below in conjunction with the accompanying drawing illustrated embodiment the utility model is done further detailed description.

See also Fig. 1, Fig. 1 is the functional-block diagram of a kind of solar-electricity power-switching circuit of the present utility model.In the present embodiment, can adopt ultracapacitor assembly or device, in order to the electric energy after reception and the described solar energy conversion device conversion of buffer memory as the electric energy buffer unit.This ultracapacitor assembly or device can be any ultracapacitors in double electric layers supercapacitor, electric chemical super capacitor, the hybrid super capacitor.

As shown in the figure, the solar-electricity power-switching circuit 100 in the present embodiment comprises super capacitor assembly 40, voltage detection unit 50, switching device unit 60 and DC/DC converter unit 70.

Preferably, because the range of nominal tension of super capacitor device is 2.5~2.7V, super capacitor assembly 40 can comprise a plurality of super capacitor devices (E1, E2......En-1, En) as required.Promptly in order to increase capacitance and voltage, can consider a plurality of super capacitor device series connection are used, and, in order to consider equilibrium charging between the super capacitor device and the variation that compensates leakage current, described super capacitor device can be formed super capacitor assembly 40 by the combination of series, parallel.In first kind of execution mode of the present utility model, adopt the super capacitor device series connection of two 2.5V5F, just as the connected mode of E1, E2 among Fig. 1, and then many capacitors that are in series are in parallel again, form bank of super capacitors 40 shown in Figure 1; Described super capacitor assembly 40 is connected between described change-over circuit 100 input anode 31 and the circuit module input cathode 32.

Voltage detection unit 50 and described electric energy buffer unit (for example, super capacitor assembly 40) parallel connection in order to detecting the voltage of described electric energy buffer unit, and according to detected magnitude of voltage, produce also output drive control signal.Particularly, described voltage detection unit 50 comprises voltage detecting input, detection module, drive control signal generation module and switching device drive end.Described voltage detecting input is connected with the change-over circuit input anode, introduce the terminal voltage of super capacitor assembly 40 and carry out the magnitude of voltage examination to detector, the output pin of detector produces the also drive control signal of output control switch device cell break-make as the switching device drive end.The function of described voltage detection unit 50 can voltage be screened device or the combination of A/D change-over circuit and microprocessor realizes.

In Fig. 2, it is a discrete component U1 that the voltage of first kind of execution mode use is screened device, and we can adopt two voltages to screen devices and produce and export drive control signal respectively when being higher than the high potential threshold value and being lower than the electronegative potential threshold value.At present commercially available this device model is a lot, as using the S-80845CNUA-B86T2G chip that high potential value (4.5V) is set, use the S-80840CNUA-B8ZT2G chip that electronegative potential value (4.0V) is set, when voltage (for example is higher than the high potential threshold value, 4.5V) time, this drive control signal generation module circuit output high level makes electronic switch (as metal-oxide-semiconductor) T1 conducting; (for example, in the time of 4.0V), this drive control signal generation module circuit output low level makes electronic switch (as metal-oxide-semiconductor) T1 power cutoff when voltage is lower than the electronegative potential threshold value.

Certainly, in the time of can also using a discrete component of screening device as voltage to be implemented in voltage to be higher than 4.5V, this circuit output high level; When voltage is lower than 4.0V, the function of this circuit output low level.

Voltage detection unit 50 can also be realized by the microprocessor U4 among Fig. 4, in this embodiment, can select STC12LE4052AD for use, its chip internal has A/D converter, during use, its the 20th pin connects stable 3V operating voltage, its P1.4 pin is set to the input pin of A/D conversion with internal processes, at this moment, the P1.4 pin goes to be connected with circuit module input anode 31 as the voltage detecting input, is used for detecting the terminal voltage of super capacitor assembly 40, and programs and make the P1.1 pin when the voltage of super capacitor assembly 40 is higher than 4.5V, this P1.1 pin output high level makes electronic switch T2 (as metal-oxide-semiconductor) conducting; When super capacitor assembly 40 voltages were lower than 4.0V, this P1.1 pin output low level made electronic switch T2 (as metal-oxide-semiconductor) power cutoff.

In order to allow solar cell obtain the output of maximum power, according to the voltage difference during the solar cell Maximum Power Output under the different light intensity degree, the utility model is adjusted the discharge threshold values of ultracapacitor assembly 40 automatically according to meeting under the different light intensity by these characteristics, stop value with the discharge of super capacitor assembly 40, make every effort to allow solar cell obtain maximum power output.To adapt under also the output of solar cell being stored under the lower illuminance situation.In an embodiment of the present utility model, can utilize light-sensitive device in the voltage detection unit 50 to detect the power of illuminance, if illuminance a little less than, the output voltage of solar cell is then lower, the terminal voltage of super capacitor assembly 40 also can be lower, at this moment, adjust voltage detection unit 50 threshold values.Threshold setting module in the voltage detection unit 50 can be set high potential threshold value and electronegative potential threshold value according to the testing result of illuminance intensity.Therefore, in another embodiment of the present utility model, voltage detection unit 50 threshold values can be reset to, when voltage was higher than 3.3V, this circuit output high level made electronic switch (as metal-oxide-semiconductor) conducting; When voltage was lower than 2.7V, this circuit output low level made electronic switch (as metal-oxide-semiconductor) power cutoff.

As mentioned above, the utility model all the time tracking illumination illumination power and work, though it is low that the voltage of supply DC/DC converter unit 70 has height to have, but the characteristic of DC/DC converter unit 70 is to allow supply power voltage that certain fluctuation range is arranged, as long as in this scope, tube voltage height not, its output all is constant voltage.Only when low-voltage power supply, the output current of super capacitor assembly 40 is big relatively.

As Fig. 2 and shown in Figure 4, switching device unit 60 comprises a kind of in metal-oxide-semiconductor, IGBT, turn-off SCR, the relay, relay J 1 contact one end of Fig. 2 is as input connecting circuit module input positive pole 31, the other end connects DC/DC converter unit 70 as output 35, and its controlled terminal connects the switching device drive end of voltage detection unit.Fig. 4 is to use metal-oxide-semiconductor as electronic switch T2's, if use the metal-oxide-semiconductor device of K790 model or XP161A1355PR model, G is as input connecting circuit module input positive pole 31 in drain electrode, other end source S connects DC/DC converter unit 70 as output 35, and its controlled terminal grid D connects the switching device drive end of voltage detection unit.

DC/DC converter unit 70, its input are connected between described switching device unit output and the described change-over circuit input cathode, and output is the output of solar-electricity power-switching circuit.As shown in Figure 1, the input of described converter unit 70 is connected between switching device unit output 35 and the change-over circuit input cathode 32, and the output of DC/DC converter unit 70 also is the output head anode 81 and the negative pole of output end 82 of solar-electricity power-switching circuit 100.

In the present embodiment, the two ends of super capacitor device or super capacitor assembly can also be connected with the voltage-limiting protection assembly.Particularly, as shown in Figure 3, the two ends of described super capacitor E2 are connected with protection assembly 45.This protection assembly 45 can be made of voltage reference device TL431; also can select for use the voltage checking chip (as S-1000N25-N4T1G) of 2.5V to constitute; protection assembly 45 conductings when voltage is higher than 2.5V on the ultracapacitor E2 monomer; make the charging current bypass, guarantee that the voltage on the ultracapacitor monomer is not higher than 2.5V.

As shown in Figure 1, described change-over circuit 100 input anode 31 connect solar energy conversion device 10 by crystal diode 20, and just solar cell is selected the 5V100mA monocrystaline silicon solar cell in the first embodiment for use, is of a size of 60 * 80mm.Model and size Selection that other are certainly arranged.

In the first embodiment, diode 20 is selected the Schottky diode of 1A for use, to reduce the pressure drop on the PN junction, reduces power loss.

The output of described DC/DC converter unit 70 connects energy-storage battery 120.In the first embodiment, DC/DC converter unit 70 can be selected the TPS63000DRC transducer for use, and its output voltage is adjusted into 3.9V (ferric phosphate lithium ion battery upper limit charging voltage).Certainly DC/DC converter unit 70 has many kinds to select, because the DC/DC conversion is a prior art, does not give unnecessary details at this.

By the enforcement of such scheme, the utility model circuit can be operated in the effective conversion state, and actual measurement is calculated and shown, the conversion storage efficiency of this circuit solar cell output electric energy is more than 90%.

As shown in Figure 1, described energy-storage battery 120 comprises a kind of in lithium ion battery, Ni-MH battery, nickel-cadmium cell, the lead-acid battery.In the first embodiment, select suitable battery according to voltage, the power demand of load, as the ferric phosphate lithium ion battery of 3.0V, 5AH.Certainly, in other embodiments, can select the battery of other specifications for use.

Load 130 can be multiple electrical equipment.

Super capacitor assembly 40 can add a container in addition and place, and is connected with change-over circuit 100 by positive lead 33, negative lead 34, also can be assembled together with change-over circuit 100.

Embodiment of the present utility model just is elaborated to know-why, does not illustrate that the utility model only limits to the described content of embodiment, and the technical staff in the industry all belongs to the utility model content according to the product of the utility model claim item manufacturing.

Facts have proved that circuit conversion storage efficiency of the present utility model is applicable to the energy storage energy of charger, electricity generation system, street lamp and other electromechanical equipment more than 90%.

Claims (10)

1. a solar-electricity power-switching circuit links to each other with the sun-generated electric power switching device, it is characterized in that described circuit comprises:
The electric energy buffer unit is connected between described change-over circuit input anode and the change-over circuit input cathode, in order to the electric energy after reception and the described solar energy conversion device conversion of buffer memory;
Voltage detection unit, in parallel with described electric energy buffer unit, in order to detecting the voltage of described electric energy buffer unit, and according to detected magnitude of voltage, produce and the drive control signal of output control switch device cell break-make;
The switching device unit, its controlled terminal receives described drive control signal, and input connects described change-over circuit input anode, and output is connected to the DC/DC converter unit;
DC/DC converter unit, its input are connected between described switching device unit output and the described change-over circuit input cathode, and output is the output of solar-electricity power-switching circuit.
2. solar-electricity power-switching circuit according to claim 1 is characterized in that: described electric energy buffer unit is super capacitor device or the super capacitor assembly that is made of by series connection and/or combination in parallel a plurality of super capacitor devices.
3. solar-electricity power-switching circuit according to claim 1 and 2 is characterized in that: the two ends of described super capacitor device or super capacitor assembly are connected with the voltage-limiting protection assembly.
4. solar-electricity power-switching circuit according to claim 1 is characterized in that: described voltage detection unit comprises:
Detection module is in order to detect the voltage of described electric energy buffer unit;
The drive control signal generation module according to detected magnitude of voltage, produces when this magnitude of voltage is higher than the high potential threshold value and is lower than the electronegative potential threshold value and the output drive control signal.
5. according to claim 1 or 4 any described solar-electricity power-switching circuits, it is characterized in that: described voltage detection unit is that voltage is screened device.
6. solar-electricity power-switching circuit according to claim 4 is characterized in that: described voltage detection unit also comprises:
Light-sensitive device is in order to detect the intensity of illuminance;
The threshold setting module according to the testing result of illuminance intensity, is set high potential threshold value and electronegative potential threshold value.
7. solar-electricity power-switching circuit according to claim 1 is characterized in that: described switching device unit is a kind of in metal-oxide-semiconductor, IGBT, turn-off SCR, the relay.
8. solar-electricity power-switching circuit according to claim 1 is characterized in that: the input anode of described change-over circuit connects the sun-generated electric power switching device by crystal diode.
9. solar-electricity power-switching circuit according to claim 1 is characterized in that: the output of described DC/DC converter unit connects energy-storage battery.
10. solar-electricity power-switching circuit according to claim 9 is characterized in that: described energy-storage battery is a kind of in lithium ion battery, Ni-MH battery, nickel-cadmium cell, the lead-acid battery.
CNU2007201438108U 2007-04-12 2007-04-12 A solar power supply conversion circuit CN201041953Y (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102104265A (en) * 2011-01-10 2011-06-22 深圳市索拉太阳能有限公司 Solar product circuit
CN101534023B (en) * 2008-03-11 2012-03-21 叶哲良 Solar charging/discharging system and charging/discharging method thereof
TWI387181B (en) * 2009-11-06 2013-02-21 Univ Taipei Chengshih Science Self - discharge compensation circuit of solar energy battery
WO2013040975A1 (en) * 2011-09-24 2013-03-28 辽宁省电力有限公司大连供电公司 Multi-level dc conversion power source device
CN103475058A (en) * 2013-09-13 2013-12-25 江苏安文电子科技有限公司 Low-power energy collection and intelligent power distribution outdoor power unit
CN103683239A (en) * 2013-12-16 2014-03-26 杭州电子科技大学 Surge protection circuit
TWI460979B (en) * 2011-10-26 2014-11-11 Control method of a dc-dc converter and a voltage coverting system
CN104717766A (en) * 2013-12-16 2015-06-17 深圳富泰宏精密工业有限公司 Wireless communication device
CN106981921A (en) * 2017-05-17 2017-07-25 浙江科技学院 Self-switching type solar charging device and charging method applied to smart lock

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101534023B (en) * 2008-03-11 2012-03-21 叶哲良 Solar charging/discharging system and charging/discharging method thereof
TWI387181B (en) * 2009-11-06 2013-02-21 Univ Taipei Chengshih Science Self - discharge compensation circuit of solar energy battery
CN102104265A (en) * 2011-01-10 2011-06-22 深圳市索拉太阳能有限公司 Solar product circuit
WO2013040975A1 (en) * 2011-09-24 2013-03-28 辽宁省电力有限公司大连供电公司 Multi-level dc conversion power source device
TWI460979B (en) * 2011-10-26 2014-11-11 Control method of a dc-dc converter and a voltage coverting system
CN103475058A (en) * 2013-09-13 2013-12-25 江苏安文电子科技有限公司 Low-power energy collection and intelligent power distribution outdoor power unit
CN103683239A (en) * 2013-12-16 2014-03-26 杭州电子科技大学 Surge protection circuit
CN104717766A (en) * 2013-12-16 2015-06-17 深圳富泰宏精密工业有限公司 Wireless communication device
CN106981921A (en) * 2017-05-17 2017-07-25 浙江科技学院 Self-switching type solar charging device and charging method applied to smart lock

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