CN201393179Y - Photovoltaic off-grid inverter - Google Patents
Photovoltaic off-grid inverter Download PDFInfo
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- CN201393179Y CN201393179Y CN200920017937U CN200920017937U CN201393179Y CN 201393179 Y CN201393179 Y CN 201393179Y CN 200920017937 U CN200920017937 U CN 200920017937U CN 200920017937 U CN200920017937 U CN 200920017937U CN 201393179 Y CN201393179 Y CN 201393179Y
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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
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Abstract
The utility model discloses a photovoltaic off-grid inverter. The photovoltaic off-grid inverter resolves the defects of the prior photovoltaic inverter, such as unreasonable component selection and defective software design and detection means, and the photovoltaic off-grid inverter has the advantages of high reliability and high efficiency, and is provided with an undervoltage, overvoltage, overload and overtemperature alarm device and the functions of reverse connection and short circuit protection. The structure of the photovoltaic off-grid inverter is as follows: the photovoltaic off-grid inverter comprises a battery pack, which is connected with a direct-current high-frequency DC-DC booster circuit, the direct-current high-frequency DC-DC booster circuit is connected with a DC-AC alternating-current inverter circuit, meanwhile, and the battery pack is also connected with a MCU controller, which is respectively bidirectionally communicated with the direct-current high-frequency DC-DC booster circuit and the DC-AC alternate-current inverter circuit and also connected with a display circuit.
Description
Technical field
The utility model relates to a kind of photovoltaic off-grid inverter that is applicable to photovoltaic system.
Background technology
China issues and implements " People's Republic of China's regenerative resource method ", also will take a series of preferential support policies for renewable energy power generations such as photovoltaic generations, comprises improving rate for incorporation into the power network etc.Can estimate that the photovoltaic system of China will be developed rapidly from now on.National Development and Reform Commission has announced " the medium-term and long-term development plan of regenerative resource " to the whole society simultaneously.Wherein mention, solar energy is one of major fields of 2010 and the year two thousand twenty regenerative resource development.The advantage of the suitable decentralized power supply of performance solar energy power generating, the employing family is with photovoltaic generating system or build the low profile photovoltaic power station, solve the powerup issue at Wu Dian from far-off regions village and no electric family, simultaneously, also will bring convenience for frontier defense, the life of remote areas without electricity such as borderland, isolated island from the net photovoltaic system, the development space that can predict China's photovoltaic off-grid GENERATION MARKET is huge.
In photovoltaic system, inverter is one of most important equipment wherein, in order to improve the cost performance of photovoltaic system, improves occupation rate of market and grasps the core technology of photovoltaic generation, and the exploitation of photovoltaic DC-to-AC converter is essential.
Summary of the invention
The purpose of this utility model is unreasonable at the components and parts type selecting of existing photovoltaic DC-to-AC converter existence on the market; defectives such as software program design and detection means do not pass a test; and provide have high reliability and efficient; under-voltage, overvoltage, overload, overtemperature alarm device, the complete photovoltaic off-grid inverters that are applicable to photovoltaic system such as reverse connecting protection and short-circuit protection function.
For achieving the above object, the utility model adopts following technical scheme:
A kind of photovoltaic off-grid inverter, it comprises battery component, battery component is connected with direct current high-frequency DC-DC booster circuit, this direct current high-frequency DC-DC booster circuit is connected with DC-AC ac converter circuit, battery component also is connected with the MCU controller simultaneously, the MCU controller then respectively with direct current high-frequency DC-DC booster circuit and the two-way communication of DC-AC ac converter circuit, the MCU controller also is connected with display circuit.
Described direct current high-frequency DC-DC booster circuit comprises that four identical small transformers T8, T9, T10, T11 constitute, all identical and elementary parallel connection of their no-load voltage ratio, secondary then adopt adjacent transformers not in-phase end connect to form four transformer cascaded structures successively.
Described DC-AC ac converter circuit comprises the peak current sample circuit and reaches the power switch tube protecting circuit; Wherein,
The peak current sample circuit is, the drain electrode of power switch pipe Q7 links to each other with the negative electrode of D24, power switch pipe Q8 drain electrode links to each other with the negative electrode of diode D25, the anode of diode D24 connects capacitor C 52, the anode tap of diode D25 connects capacitor C 53, the anode of diode D24 also is connected to the SPWMAL end by the anode tap of resistance R 48, diode D22 simultaneously, and the anode of diode D25 also is connected to the SPWMBL end by the anode tap of resistance R 49, diode D23 simultaneously;
The power switch tube protecting circuit is that it is made up of power switch pipe Q3, Q4, four power MOSFET tubes of Q7, Q8 or high-power IGBT and Transient Suppression Diode D18, D19, D20, D21; The protective circuit of power switch pipe Q3 is the driving port of SPWMAH end connects power switch pipe Q3 by resistance R 5 a grid, the grid of power switch pipe Q3 is by Transient Suppression Diode D19, resistance R 7, capacitor C 7 is connected to form power switch pipe Q3 protective circuit structure with the drain electrode of power switch pipe Q3; The driving port of the protective circuit of power switch pipe Q4: SPWMBH end connects the grid of power switch pipe Q4 by resistance R 6, the grid of power switch pipe Q4 is by Transient Suppression Diode D18, resistance R 8, capacitor C 8 is connected to form power switch pipe Q4 protective circuit structure with the drain electrode of power switch pipe Q4; The driving port of the protective circuit of power switch pipe Q7: SPWMAL end connects the grid of power switch pipe Q7 by resistance R 13, the grid of power switch pipe Q7 is by Transient Suppression Diode D21, resistance R 15, capacitor C 16 is connected to form power switch pipe Q7 protective circuit structure with the drain electrode of power switch pipe Q7; The driving port of the protective circuit of power switch pipe Q8: SPWMBL end connects the grid of power switch pipe Q8 by resistance R 14; the grid of power switch pipe Q8 is by Transient Suppression Diode D20; resistance R 16, capacitor C 15 is connected to form power switch pipe Q8 protective circuit structure with the drain electrode of power switch pipe Q8.
Described MCU controller adopts the MEGA88 processor.
Described display circuit is Liquid Crystal Module 1602A.
The beneficial effects of the utility model are: simple in structure, easy to use, with low cost, have high reliability and efficient, and under-voltage, overvoltage, overload, overtemperature alarm device, reverse connecting protection and short-circuit protection function are complete.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is a direct current high-frequency DC-DC booster circuit schematic diagram;
Fig. 3 is DC-AC full-bridge inverting peak current sample circuit and power switch tube protecting circuit.
Wherein, 1. battery component, 2. direct current high-frequency DC-DC booster circuit, 3.DC-AC ac converter circuit, 4.MCU controller, 5. display circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Among Fig. 1, it comprises battery component 1, direct current high-frequency DC-DC booster circuit 2, DC-AC ac converter circuit 3, MCU controller 4 and display circuit 5.Battery component 1 at first connects direct current high-frequency DC-DC booster circuit 2, the pulse width modulated drive signal of the numerical control system output by MCU controller 4 becomes about 370 volts of direct voltages with the DC low-voltage of battery component 1, direct current high-frequency DC-DC booster circuit 2 is connected with DC-AC ac converter circuit 3, and the modulation SPWM signal by MCU controller 4 output becomes accurately 220 volts of alternating voltages with 370 volts of direct voltages.Comprise the peak current sample circuit in the DC-AC ac converter circuit 3 and reached the power switch tube protecting circuit; the signal of its output is delivered in the MCU controller 4 and is handled; treated signal shows by display circuit 5 again, and the software of display circuit 5 also can the integrated function of restarting automatically that designs at the unattended characteristics of photovoltaic DC-to-AC converter field work simultaneously.
Among Fig. 2, the number of turn of direct current high-frequency DC-DC booster circuit 2 general using transformers recently obtains higher direct voltage, and this transformer production technology is relatively poor, if the elementary number of turns is more, the problem that will exist secondary winding can't steer clear of can only increase volume and solve.If the elementary number of turns is less, that primary inductance just diminishes accordingly, and bigger to the impact of its switching tube, switching loss increases thereupon.For addressing this problem, the utility model has designed a kind of DC-DC circuit of high step-up ratio of novelty, and it is made of 4 identical small transformers, and no-load voltage ratio is all identical, their elementary parallel connection, secondary then adopt adjacent transformers not in-phase end connect to form four transformer cascaded structures.The principle that this structure is distributed prime power automatically is as follows:
The parameter of transformer T8, transformer T9, transformer T10, transformer T11 is identical, primary recommends in the winding that electric current is respectively Iin8, Iin9, Iin10, Iin11 secondary load electric current is Iout, n is that turn ratio is worked as when each transformer's primary current is unequal to be the power imbalance, because have following formula to set up, so each transformer's primary current equates.
Iin8＝nIout(1)
Iin9＝nIout(2)
Iin10＝nIout(3)
Iin11＝nIout(4)
The sort circuit structure not only can make each primary realize automatic current equalizing, can also make the module design of transformer, simplifies the manufacture craft of transformer, has reduced loss.Compare with single transformer, this structure has reduced the no-load voltage ratio of transformer, has strengthened the magnetic coupling of the former secondary of transformer, has reduced leakage inductance, has reduced losing of duty ratio, makes the performance of system significantly improve.
Among Fig. 3, DC-AC ac converter circuit 3 has peak current sample circuit and and power switch tube protecting circuit.Wherein, the peak current sample circuit is: the drain electrode of power switch pipe Q7 links to each other with the negative electrode of diode D24, and power switch pipe Q8 drain electrode links to each other with the negative electrode of diode D25.The anode of diode D24 connects capacitor C 52, and the anode tap of diode D25 connects capacitor C 53.The anode of diode D24 also is connected to the SPWMAL end by the anode tap of resistance R 48, diode D22 simultaneously, the anode of diode D25 also is connected to the SPWMBL end by the anode tap of resistance R 49, diode D23 simultaneously, and above circuit connects to form peak current sample circuit structure.
When the SPWMAL end signal is high level, power switch pipe Q7 conducting, its switching tube conduction pipe pressure drop is held by SPWMAL, resistance R 48, diode D25, clamped on capacitor C 52, i.e. VC52=VD25+Q7 tube voltage drop, VD25 is constant to be 0.7 volt, so the voltage of capacitor C 52 is exactly the conducting voltage of power switch pipe Q7.When the SPWMAL end signal was low level, the voltage of capacitor C 52 discharged by diode D22, not conducting of power switch pipe Q7, and its tube voltage drop makes diode D25 back biased, and the voltage of capacitor C 52 does not reflect the tube voltage drop of power switch pipe Q7.The work of power switch pipe Q8 in like manner, two switching tubes of power switch pipe Q7, power switch pipe Q8 detect separately conducting electric current in turn, and feed back on capacitor C 52, the capacitor C 53.Test data is shown below:
Load current is that 8A (direct current) switching tube Q7 internal resistance is that collection voltage on the 20m Ω C52 electric capacity is 165.00mV (ignoring the diode tube voltage drop).
Load current is that the collection voltage on 10A (direct current) the C52 electric capacity is 205.00mV
Load current is that the collection voltage on 10.5A (direct current) the C52 electric capacity is 210.00mV
Find out from above data, the value of load current basically with the proportional relation of the conducting voltage of switching tube, so the sort circuit structure is practical.Compare with other resistance or constantan wire current sampling circuit, the sort circuit structure has and does not consume unnecessary power, does not influence the advantages such as drive waveforms of switching tube, belongs to the new-type circuit design.
The power switch tube protecting circuit is: it is made up of power switch pipe Q3, power switch pipe Q4, four power MOSFET tubes of power switch pipe Q7, power switch pipe Q8 or high-power IGBT and Transient Suppression Diode D18, diode D19, diode D20, diode D21, as shown in Figure 3.With power switch pipe Q3 is example; the driving port of SPWMAH end connects the grid of power switch pipe Q3 by resistance R 5; the grid of power switch pipe Q3 passes through Transient Suppression Diode D19, resistance R 7, and capacitor C 7 is connected to form power switch pipe Q3 protective circuit structure with the drain electrode of power switch pipe Q3.The driving port of the protective circuit of power switch pipe Q4: SPWMBH end connects the grid of power switch pipe Q4 by resistance R 6; the grid of power switch pipe Q4 is by Transient Suppression Diode D18; resistance R 8, capacitor C 8 is connected to form power switch pipe Q4 protective circuit structure with the drain electrode of power switch pipe Q4.The driving port of the protective circuit of power switch pipe Q7: SPWMAL end connects the grid of power switch pipe Q7 by resistance R 13; the grid of power switch pipe Q7 is by Transient Suppression Diode D21; resistance R 15, capacitor C 16 is connected to form power switch pipe Q7 protective circuit structure with the drain electrode of power switch pipe Q7.The driving port of the protective circuit of power switch pipe Q8: SPWMBL end connects the grid of power switch pipe Q8 by resistance R 14; the grid of power switch pipe Q8 is by Transient Suppression Diode D20; resistance R 16, capacitor C 15 is connected to form power switch pipe Q8 protective circuit structure with the drain electrode of power switch pipe Q8.
The protective circuit of inverter own is complete, but the problem that exists the full-bridge inverting switching tube to damage.There are unsettled variation in bridge midpoint potential VA and VB because load is various up and down, with power switch pipe Q8 is example, if the current potential of VA is because capacitive load causes moment to descend or rise because of inductive load moment, time-delay will cause the switching tube misoperation if there is response in the current potential of power switch pipe Q8 grid, serious meeting causes gate breakdown, causes the straight-through damage of upper and lower bridge arm.Diode D18, diode D19, diode D20, diode D21 are the transient state suppressing diode, they cooperate with capacitor C 7, capacitor C 8, capacitor C 15, capacitor C 16 (above electric capacity is generally got 10pF-20pF) has accelerated response speed, reached nanosecond through test, the relative source electrode of grid potential is responded rapidly, avoid switching tube to damage.
Through above improvement, inverter is at impact, the prominent resistive full load, output waveform smooth transition of unloading.Inverter at impact, prominent unload the rectification full load, the rare distortion of output waveform, but not vibration, waveform distortion has reached the data shown in figure below, performance has satisfied the requirement of photovoltaic DC-to-AC converter fully.
| Loading condition | Unloaded | 800W is resistive | The 1kW rectification |
| THD(％) | 1.20 | 2.07 | 2.72 |
Claims (5)
1. photovoltaic off-grid inverter, it is characterized in that, it comprises battery component, battery component is connected with direct current high-frequency DC-DC booster circuit, this direct current high-frequency DC-DC booster circuit is connected with DC-AC ac converter circuit, simultaneously battery component also is connected with the MCU controller, the MCU controller then respectively with direct current high-frequency DC-DC booster circuit and the two-way communication of DC-AC ac converter circuit, the MCU controller also is connected with display circuit.
2. photovoltaic off-grid inverter as claimed in claim 1, it is characterized in that, described direct current high-frequency DC-DC booster circuit comprises that four identical small transformers T8, T9, T10, T11 constitute, the all identical and elementary parallel connection of their no-load voltage ratio, secondary then adopt adjacent transformers not in-phase end connect to form four transformer cascaded structures successively.
3. photovoltaic off-grid inverter as claimed in claim 1 is characterized in that, described DC-AC ac converter circuit comprises the peak current sample circuit and reaches the power switch tube protecting circuit; Wherein,
The peak current sample circuit is, the drain electrode of power switch pipe Q7 links to each other with the negative electrode of D24, power switch pipe Q8 drain electrode links to each other with the negative electrode of diode D25, the anode of diode D24 connects capacitor C 52, the anode tap of diode D25 connects capacitor C 53, the anode of diode D24 also is connected to the SPWMAL end by the anode tap of resistance R 48, diode D22 simultaneously, and the anode of diode D25 also is connected to the SPWMBL end by the anode tap of resistance R 49, diode D23 simultaneously;
The power switch tube protecting circuit is that it is made up of power switch pipe Q3, Q4, four power MOSFET tubes of Q7, Q8 or high-power IGBT and Transient Suppression Diode D18, D19, D20, D21; The protective circuit of power switch pipe Q3 is the driving port of SPWMAH end connects power switch pipe Q3 by resistance R 5 a grid, the grid of power switch pipe Q3 is by Transient Suppression Diode D19, resistance R 7, capacitor C 7 is connected to form power switch pipe Q3 protective circuit structure with the drain electrode of power switch pipe Q3; The driving port of the protective circuit of power switch pipe Q4: SPWMBH end connects the grid of power switch pipe Q4 by resistance R 6, the grid of power switch pipe Q4 is by Transient Suppression Diode D18, resistance R 8, capacitor C 8 is connected to form power switch pipe Q4 protective circuit structure with the drain electrode of power switch pipe Q4; The driving port of the protective circuit of power switch pipe Q7: SPWMAL end connects the grid of power switch pipe Q7 by resistance R 13, the grid of power switch pipe Q7 is by Transient Suppression Diode D21, resistance R 15, capacitor C 16 is connected to form power switch pipe Q7 protective circuit structure with the drain electrode of power switch pipe Q7; The driving port of the protective circuit of power switch pipe Q8: SPWMBL end connects the grid of power switch pipe Q8 by resistance R 14; the grid of power switch pipe Q8 is by Transient Suppression Diode D20; resistance R 16, capacitor C 15 is connected to form power switch pipe Q8 protective circuit structure with the drain electrode of power switch pipe Q8.
4. photovoltaic off-grid inverter as claimed in claim 1 is characterized in that, described MCU controller adopts the MEGA88 processor.
5. photovoltaic off-grid inverter as claimed in claim 1 is characterized in that, described display circuit is Liquid Crystal Module 1602A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920017937U CN201393179Y (en) | 2009-01-12 | 2009-01-12 | Photovoltaic off-grid inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920017937U CN201393179Y (en) | 2009-01-12 | 2009-01-12 | Photovoltaic off-grid inverter |
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| Publication Number | Publication Date |
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| CN201393179Y true CN201393179Y (en) | 2010-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200920017937U Expired - Fee Related CN201393179Y (en) | 2009-01-12 | 2009-01-12 | Photovoltaic off-grid inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497144A (en) * | 2011-11-28 | 2012-06-13 | 北京动力机械研究所 | DC (Direct-current) brushless motor driving control device for collecting zero crossing point based on hardware comparison |
| CN107093886A (en) * | 2017-06-27 | 2017-08-25 | 合肥尚硕新能源有限公司 | It is a kind of to be embedded in solar powered network from the voltage security power supply circuit become in device |
| CN107294199A (en) * | 2017-06-27 | 2017-10-24 | 合肥尚硕新能源有限公司 | A kind of compound voltage detecting switching circuit of logic |
-
2009
- 2009-01-12 CN CN200920017937U patent/CN201393179Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497144A (en) * | 2011-11-28 | 2012-06-13 | 北京动力机械研究所 | DC (Direct-current) brushless motor driving control device for collecting zero crossing point based on hardware comparison |
| CN107093886A (en) * | 2017-06-27 | 2017-08-25 | 合肥尚硕新能源有限公司 | It is a kind of to be embedded in solar powered network from the voltage security power supply circuit become in device |
| CN107294199A (en) * | 2017-06-27 | 2017-10-24 | 合肥尚硕新能源有限公司 | A kind of compound voltage detecting switching circuit of logic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HUANGMING ENERGY-SAVING HOLDINGS CO., LTD. Free format text: FORMER OWNER: HIMIN SOLAR ENERGY GROUP CO.,LTD. Effective date: 20100402 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20100402 Address after: 253090, No. 909, middle Avenue, Hubin, Dezhou, Shandong Patentee after: Himin Holdings Co., Ltd. Address before: 253090, No. 909, middle Avenue, Hubin, Dezhou, Shandong Patentee before: Himin Solar Energy Group Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100127 Termination date: 20140112 |