CN204068815U - There is the photovoltaic DC power supply of MPPT maximum power point tracking function - Google Patents
There is the photovoltaic DC power supply of MPPT maximum power point tracking function Download PDFInfo
- Publication number
- CN204068815U CN204068815U CN201420325984.6U CN201420325984U CN204068815U CN 204068815 U CN204068815 U CN 204068815U CN 201420325984 U CN201420325984 U CN 201420325984U CN 204068815 U CN204068815 U CN 204068815U
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- China
- Prior art keywords
- photovoltaic
- power supply
- circuit
- photovoltaic module
- voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model provides a kind of photovoltaic DC power supply.This power supply comprises photovoltaic module, power governor, direct current exports and direct current inputs (optional).Wherein power governor comprises direct current transformation circuit, single-chip microcomputer, temperature sensor, voltage detecting and switching circuit.Single-chip Controlling switching circuit works, and is adjusted the output voltage of photovoltaic module, until the maximum power point voltage that the photovoltaic module output voltage detected and single-chip microcomputer calculate according to assembly temperature conforms to by the mode of adjustment switching circuit duty ratio.
Description
Technical field
The utility model is a kind of DC power supply with maximum photovoltaic power point following function, belongs to photovoltaic generation and technical field of direct current power.
Background technology
Use galvanic household electrical appliances and electronic product as liquid crystal display, mobile phone, panel computer, digital camera, the equipment such as USB fan need DC power supply.Photovoltaic cell is the device utilizing photovoltaic effect to be electric energy by transform light energy.The output of photovoltaic cell is direct current.Because photovoltaic generation has pollution-free, resourceful feature, so photovoltaic cell is suitable as outdoor DC power supply.
According to the difference of the photoelectric conversion material of photovoltaic cell, photovoltaic cell can be divided into crystal silicon cell (to comprise monocrystalline silicon battery, polycrystal silicon cell and hetero-junction solar cell), amorphous silicon/micro-crystalline silicon cell, cadmium telluride cells, chalcopyrite (such as Copper Indium Gallium Selenide) battery, organic battery, dye-sensitized cell, quantum dot cell, iii-v battery, the types such as laminated cell.Except laminated cell, the maximum voltage that single photovoltaic cell exports is subject to the restriction of the energy gap of light absorbent in photovoltaic cell, usually below 1 volt, so the photovoltaic cell usually containing multiple series connection in photovoltaic DC power supply.
Photovoltaic cell is easily subject to external climate factor, the impact of such as oxygen, water vapour, ultraviolet, external force, thunder and lightning etc. and aging to such an extent as to lost efficacy; The photovoltaic cell of therefore connecting needs with ability Long-Time Service after weatherable materials encapsulation.The photovoltaic cell of series connection is encapsulated the photovoltaic battery panel formed, be called as photovoltaic module.
When illumination invariant, the output of photovoltaic module becomes along with the impedance variation of external loading, as shown in Figure 1.The power output of assembly, be the product of output current and output voltage, when the impedance of external loading reaches certain particular value, assembly power output reaches maximum, now corresponding output current and voltage, be called as maximum power point electric current and maximum power point voltage respectively.If the impedance of external loading is greater than or less than this particular value, the power output of assembly will reduce.
A lot of DC electronic equipment, as smart mobile phone, its charging circuit automatically can detect charging current and limit the size of charging current.If charging circuit detects that the output current of power supply does not reach the rated charge stream of electronic equipment, charging circuit can adjust himself impedance, and itself and charging current are matched.Now the impedance variation of charging circuit has influence on the operating state of photovoltaic module conversely, makes it away from maximum power point, thus exports less power.When assembly power output drops to the input power of charging circuit permission, photo-voltaic power supply enters steady-working state.Now charging current limit by the charging circuit of electronic equipment, even if illumination strengthen, charging current also can not increase.
Summary of the invention
The utility model provides a kind of photovoltaic DC power supply as shown in Figure 2.This power supply comprises photovoltaic module, power governor, direct current output, and optional direct current input.Wherein power governor comprises direct current transformation circuit, single-chip microcomputer, temperature sensor, voltage detecting circuit and switching circuit.
The operation principle of the power governor in the utility model is as follows: the output voltage of photovoltaic module is converted to metastable output valve by direct current transformation circuit, temperature sensor detects the temperature of photovoltaic module, voltage detecting circuit detects the output voltage of photovoltaic module, the duty ratio of switching circuit can be regulated by single-chip microcomputer, the duty ratio of by-pass cock circuit can change the output impedance of photovoltaic module, and then the output voltage of adjustment photovoltaic module, the assembly temperature that single-chip microcomputer detects according to the program preset and temperature sensor calculates the maximum power point voltage of photovoltaic module and compares with assembly output voltage.
If the difference of the output voltage of photovoltaic module and maximum power point voltage is less than or equal to the preset value of Single Chip Microcomputer (SCM) program, judgement photovoltaic module output voltage conforms to its maximum power point voltage by single-chip microcomputer, otherwise will be judged to not to be inconsistent.
If the assembly output voltage detected and maximum power point voltage are not inconsistent, single-chip microcomputer by the duty ratio of adjustment switching circuit, thus changes the output impedance of photovoltaic module, and then the output voltage of adjustment photovoltaic module; Then this output voltage compares with maximum power point voltage by single-chip microcomputer again, if still do not conform to, then continues the duty ratio of adjustment switching circuit; So repeatedly until assembly output voltage conforms to maximum power point voltage.
Run into the situation that load charging circuit adjusts charging current automatically, the switching circuit in power governor plays the effect to load power-off restarting repeatedly simultaneously, can prevent the charging circuit of load that charging current is locked in lower numerical value.
The position of switching circuit, can be positioned at the output of direct current transformation circuit, as shown in Figure 2; Also the input of direct current transformation circuit can be positioned at, as shown in Figure 3.
The power supply of single-chip microcomputer, can come from photovoltaic DC power supply self, or external power source is as battery.
The photovoltaic cell that photovoltaic module in the utility model uses is monocrystalline silicon battery, polycrystal silicon cell, hetero-junction solar cell, amorphous silicon battery, micro-crystalline silicon cell, cadmium telluride cells, copper indium gallium selenide cell, copper indium diselenide battery, organic solar batteries, dye-sensitized cell, quantum dot cell, iii-v battery or laminated cell.
Direct current transformation circuit in the utility model, output voltage not higher than 25 volts, direct current transformation circuit can be any one of following three kinds of circuit: voltage up converting circuit, decompression converting circuit and buck change-over circuit.
DC output end in the utility model and the rated voltage of input be not higher than 25 volts.Port be onboard charger interface, charger for mobile phone interface, notebook computer interface, Apple Lightning Dock interface, USB1.0, USB1.1, USB2.0, USB3.0, USB3.1 or USB PD interface.
accompanying drawing explanation
Fig. 1 is the power output-voltage curve variation with temperature schematic diagram of photovoltaic module.At the same temperature, assembly has unique maximum power point.Along with the rising of temperature, peak power output and the maximum power point voltage of assembly all reduce.
Fig. 2 is schematic diagram of the present utility model.
Fig. 3 is the schematic diagram of another kind of form of the present utility model.
Fig. 4 is a specific embodiment of direct current transformation circuit in the utility model and switching circuit.
Fig. 5 is a specific embodiment of the single chip circuit in the utility model.
Fig. 6 is a specific embodiment of the temperature sensor circuit in the utility model.
Fig. 7 is a specific embodiment of the voltage detecting circuit in the utility model.
embodiment
An embodiment of the present utility model can adopt ATMEGA16 single-chip microcomputer, TPS63060 direct current transformation chip and 700Pt temperature sensor to make.Switching circuit and direct current transformation circuit are as shown in Figure 4, the core of direct current transformation circuit is TPS63060 direct current transformation chip, the photovoltaic module that is input as of direct current transformation circuit exports, the direct current transformation circuit that is input as of switching circuit exports and voltage is that the external direct current of 5 volts inputs), single chip circuit, temperature sensor circuit and voltage detecting circuit are respectively as shown in Fig. 5, Fig. 6, Fig. 7.The output signal TempratureOutD0 of temperature sensor circuit is as the input of single-chip microcomputer No. 35 pins, and the temperature computation that single-chip microcomputer can record according to temperature sensor thus goes out the maximum power point voltage of photovoltaic module.Voltage detecting circuit survey voltage signal Voltage Out as the input of single-chip microcomputer No. 33 pins, the maximum power point voltage that this voltage and previous calculations go out compares by single-chip microcomputer, if the two does not conform to, then single-chip microcomputer sends voltage control signal Vcontrol to switching circuit by No. 44 pins, is changed the output voltage of photovoltaic module by adjustment switching circuit.
Claims (10)
1. a photovoltaic DC power supply, containing photovoltaic module, power governor and DC output end mouth, is characterized in that: power governor contains direct current transformation circuit, single-chip microcomputer, temperature sensor, voltage detecting circuit and switching circuit.
2. photovoltaic DC power supply according to claim 1, is characterized in that: voltage detecting circuit is used for detecting the output voltage of photovoltaic module.
3. photovoltaic DC power supply according to claim 1, is characterized in that: temperature sensor is used for detecting the working temperature of photovoltaic module.
4. photovoltaic DC power supply according to claim 1, it is characterized in that: single-chip microcomputer calculates the maximum power point voltage of photovoltaic module according to the testing result of temperature sensor, and adjust switching circuit, until the output voltage of photovoltaic module conforms to the maximum power point voltage of photovoltaic module.
5. photovoltaic DC power supply according to claim 1, is characterized in that: switching circuit is at the output of direct current transformation circuit or input.
6. photovoltaic DC power supply according to claim 1, is characterized in that: the power supply of single-chip microcomputer is photovoltaic DC power supply self or external power source.
7. photovoltaic DC power supply according to claim 1, is characterized in that: photovoltaic module uses monocrystalline silicon battery, polycrystal silicon cell, hetero-junction solar cell, amorphous silicon battery, micro-crystalline silicon cell, cadmium telluride cells, copper indium gallium selenide cell, copper indium diselenide battery, organic solar batteries, dye-sensitized cell, quantum dot cell, iii-v battery or laminated cell.
8. photovoltaic DC power supply according to claim 1, is characterized in that: the output voltage of direct current transformation circuit is not higher than 25 volts, and direct current transformation circuit is boost conversion, step-down conversion or buck change-over circuit.
9. photovoltaic DC power supply according to claim 1, is characterized in that: the rated voltage of direct-flow input end and output is not higher than 25 volts.
10. photovoltaic DC power supply according to claim 1, it is characterized in that: DC output end is onboard charger interface, the Lightning Dock interface of charger for mobile phone interface, notebook computer interface, Apple, USB1.0, USB1.1, USB2.0, USB3.0, USB3.1 or USB PD interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420325984.6U CN204068815U (en) | 2014-06-17 | 2014-06-17 | There is the photovoltaic DC power supply of MPPT maximum power point tracking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420325984.6U CN204068815U (en) | 2014-06-17 | 2014-06-17 | There is the photovoltaic DC power supply of MPPT maximum power point tracking function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204068815U true CN204068815U (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420325984.6U Expired - Fee Related CN204068815U (en) | 2014-06-17 | 2014-06-17 | There is the photovoltaic DC power supply of MPPT maximum power point tracking function |
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| CN (1) | CN204068815U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505933A (en) * | 2016-12-30 | 2017-03-15 | 马鞍山佳鼎通信科技有限公司 | A kind of outdoor solar power supply system |
-
2014
- 2014-06-17 CN CN201420325984.6U patent/CN204068815U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505933A (en) * | 2016-12-30 | 2017-03-15 | 马鞍山佳鼎通信科技有限公司 | A kind of outdoor solar power supply system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 200003, room 1, No. 355, Lane 2303, West Beijing Road, Shanghai, Huangpu District Patentee after: Zheng Zhi Address before: 200030 Shanghai city Xuhui District South Wanping Road 388 Lane 4, room 602 Patentee before: Zheng Zhi |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 Termination date: 20190617 |