CN102545670A - Novel power-level topological structure of micro inverter - Google Patents
Novel power-level topological structure of micro inverter Download PDFInfo
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- CN102545670A CN102545670A CN2010106047179A CN201010604717A CN102545670A CN 102545670 A CN102545670 A CN 102545670A CN 2010106047179 A CN2010106047179 A CN 2010106047179A CN 201010604717 A CN201010604717 A CN 201010604717A CN 102545670 A CN102545670 A CN 102545670A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a novel power-level topological structure of a micro inverter, wherein the corresponding end of a first primary winding and the non-corresponding end of a second primary winding of a dual-winding booster transformer are connected to an anode of a solar photovoltaic cell assembly, the non-corresponding end of the first primary winding and the corresponding end of the second primary winding are respectively connected to a cathode of the solar photovoltaic cell assembly through a first power switching tube and a second power switching tube; and the corresponding end of a first secondary winding and the non-corresponding end of a second secondary winding of the dual-winding booster transformer are respectively connected to a load through an alternating current circuit consisting of a fourth and a third semi-control or full-control power switching tubes. By adopting a working mode of forward-flyback booster of the dual-winding transformer and modulation secondary side sine wave half-cycle alternating current switch control of a primary PWM (Pulse-Width Modulation), the novel power-level topological structure realizes direct-current and alternating-current electric energy conversion and power transmission, and improves work waveforms of the primary windings and the secondary windings through a feedback mode, thereby obtaining higher conversion and inversion system efficiency under the condition of keeping higher step-up ratio and perfect conversion and inversion waveforms.
Description
Technical field
The present invention relates to a kind of solar photovoltaic technology, be specifically related to a kind of photovoltaic DC-to-AC converter, particularly a kind of little inverter power level novel topological structure.
Background technology
The solar energy power generating industry is just at rapid growth, and photovoltaic generation will be the most important pillar of the sustainable new forms of energy of cleaning.Photovoltaic DC-to-AC converter is a key device of realizing photovoltaic generation, along with the photovoltaic generation increase in demand, and the focus that photovoltaic grid-connected inversion technology and photovoltaic DC-to-AC converter have become research and used.
By application class, the photovoltaic cell system mainly contains independent battery assembly, battery component string and three kinds of forms of battery component array, be that the independent photovoltaic unit generates electricity by way of merging two or more grid systems through little inverter with the independent battery assembly is recent technical research emphasis and development trend.Inverter power level topological structure is one of most important content of photovoltaic inversion transformation technique research.
The power stage topological structure of little inverter can have been concluded several kinds, is respectively single inductance boost, two inductance boost, capacitance boost type and transformer booster type.Wherein transformer boosts comprises forms such as adopting flyback, forward and bridge.The transformer input and output be divided into again recommend, working method such as all-wave and full-bridge.These topological characteristics are, inductance boost converter simple in structure, but step-up ratio and conversion efficiency are all lower; The structure of capacitance boost converter is complicated with control, and step-up ratio improves also limited; Transformer half-bridge or full bridge boost converter can be taken into account higher step-up ratio and conversion efficiency, are the main topological forms that the little inverter of photovoltaic adopts.
Because improving constantly of photovoltaic inversion performance requirement adopts existing transformer boosting inverter form to be difficult to further develop skill index.Therefore, designing a kind of novel little inverter power level topological structure is the problem that this area is needed solution badly.
Summary of the invention
The present invention is directed to existing existing difficult point of little inverter and defective; Propose and develop a kind of novel little inverter power level topological structure; It takes the positive and negative commendable increase of two winding transformer to press and the working method of the sinusoidal wave half cycle alter switch control of former limit PWM switch modulation secondary realizes orthogonal transformation of electrical energy and power transmission; This little inverter power level topological structure is eliminated the spike overshoot, is improved waveform and reduce high-frequency loss by the mechanism of back coupling; Under the situation that keeps high step-up ratio and ideal transformation and inversion waveform, obtain very high conversion and inversion system efficient.
In order to achieve the above object, the technical scheme of the present invention's employing is following:
Little inverter power level novel topological structure; It is characterized in that; Said topological structure comprises double winding step-up transformer, first power switch pipe and second power switch pipe, first half control or controls power switch pipe entirely and second half control or control power switch pipe, first input capacitance and second input capacitance entirely; Former limit first winding end of the same name of said double winding step-up transformer and the former limit second winding non-same polarity are connected to the positive pole of solar photovoltaic battery component, and the former limit first winding non-same polarity of said double winding step-up transformer and former limit second winding end of the same name are connected to the negative pole of solar photovoltaic battery component respectively through said first power switch pipe and second power switch pipe; Secondary first winding of said double winding step-up transformer and secondary second winding are respectively through said first half control or control power switch pipe entirely and second half control or control power switch pipe entirely and be connected to load; One nonpolarity end of the positive ends of said input first input capacitance and second input capacitance is connected to the positive pole of solar photovoltaic battery component, and another nonpolarity end of the negative polarity end of first input capacitance and second input capacitance is connected to the negative pole of solar photovoltaic battery component; Said first half control or control power switch pipe entirely and second half control or control the output of power switch pipe entirely; To be connected to buffer capacitor and passive load like need from the net inversion; As need parallel network reverse then to be connected to flat ripple inductance, and be connected to active load through said flat ripple inductance.
In the preferred embodiment of the present invention, said first power switch pipe and second power switch pipe are MOSFET or IGBT pipe, are used for the control of PWM waveform modulated switch.
Further, the magnetic core of said double winding step-up transformer is particular iron oxysome, slim amorphous alloy film, the senior electrical steel sheet of orientation or the senior electrical steel sheet of non-orientation.
Further, said double winding step-up transformer be the two groups of former limit first winding and former limit second winding and around and the different name end interconnection of former limit first winding and former limit second winding; The two groups of secondary first winding and secondary second winding and around and independent separately, said former limit first winding and former limit second winding, secondary first winding and secondary second winding are taked two-wire or multi-thread and form around mode.
Further, said first half control or control power switch pipe entirely and second half control or control power switch pipe entirely and be half control SCR pipe or control specific MOSFET entirely or the IGBT pipe is used for positive and negative half cycle alternation output switch control on the inversion sine wave period.
Further, said first power switch pipe, second power switch pipe, former limit first winding, former limit second winding and first electric capacity, second electric capacity can provide feedback path.
The present invention who obtains according to technique scheme has designs simplification, step-up ratio is high, the conversion inversion efficiency is high, reliability is high and output waveform electric energy quality height and advantage of low manufacturing cost; Simultaneously; Adopt advanced pulse width modulation controlled and parameter optimization; Afterflow back coupling performance is obviously improved under the HF switch work, and modulation output waveform and conversion efficiency reach first-class level.
Simultaneously; The integrated new technology of conversion inversion that the positive and negative commendable increase of the two winding transformer that this topological structure provided by the invention is taked ad hoc structure is pressed and former limit modulation secondary alternation is controlled; And take the back coupling mode to improve former and deputy limit winding work wave; Suppress afterflow spike overshoot voltage and reduce the radio-frequency component loss, to reduce power switch pipe quantity and dynamic quiescent dissipation, under desirable step-up ratio and waveform output; Obtain very high technical performance indexs such as conversion inversion efficiency and electric energy output quality, and obtain good cost performance.
Description of drawings
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
Fig. 1 is of the present invention from net type circuit topology figure.
Fig. 2 is grid type circuit topology figure of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
Embodiment 1
Referring to Fig. 1; It is depicted as provided by the invention from the little inverter power level of net type novel topological structure; It comprises double winding step-up transformer T1, power switch tube S W1, SW2, the half control of solar photovoltaic battery component phc, ad hoc structure or controls switching tube SW3, SW4 entirely, and input capacitance C11, C12 and output buffer capacitor C2 (when being connected passive load).
Wherein, double winding step-up transformer T1 has former limit winding N11: secondary winding N21 and former limit winding N12: secondary winding N22 voltage ratio.
The end of the same name of the former limit winding N11 of double winding step-up transformer T1 and the non-same polarity of former limit winding N12 are connected to the positive pole of solar photovoltaic battery component phc, and the end of the same name of former limit winding N11 non-same polarity and former limit winding N12 is connected to the negative pole of solar photovoltaic battery component phc respectively through power switch tube S W1, SW2.
The secondary winding N21 of double winding step-up transformer T1, N22 are respectively through half control or control the alternating current circuit that switching tube SW4, SW3 form entirely and be connected to buffer capacitor C2 and passive load.
Among the present invention, the magnetic core of double winding step-up transformer T1 adopts particular iron oxysome, slim amorphous alloy film or high-performance orientation/no oriented electric silicon steel sheet, to obtain good high frequency response characteristic, reduces the high frequency iron loss.
Simultaneously, the winding of double winding step-up transformer T1 is taked two-wire or multi-thread and around mode, to reduce copper loss under the high-frequency work.
Power switch tube S W1, SW2 adopt extremely short MOSFET pipe or IGBT pipe of low back-pressure, low channel resistance and switching time, effectively reduce modulation switch loss and on-state loss.Power switch tube S W1, SW2 are used for switch modulation control, in arbitrary unidirectional cycle, to obtain exporting the required sinusoidal rule or the modulation waveform of other particular law.
Alternating current circuit among the present invention is by half control or control power switch tube S W4 entirely, SW3 forms, half control or control power switch tube S W4, SW3 entirely for half control SCR pipe or control specific MOSFET entirely or the IGBT pipe.It has the high speed recovery characteristics of silicon carbide switches pipe, suppresses transmission effect to obtain good anti-sharp the back coupling.Power switch tube S W4, the SW3 of half control or full control is used for alter switch control, on ac cycle, obtaining the interchange output based on the half period, and has characteristics such as low switch loss and control is simple and reliable.
Basis at such scheme; The present invention also adds high frequency power and transmits buffer circuit in novel topological structure; It is input capacitance C11 and C12; The nonpolarity end of the positive ends of input capacitance C11 and input capacitance C12 is connected to the positive pole of solar photovoltaic battery component phc, and another nonpolarity end of the negative polarity end of input capacitance C11 and input capacitance C12 is connected to the negative pole of solar photovoltaic battery component phc.
Input capacitance C11 that adopts among the present invention and C12 can provide high frequency power transmission buffering, and can under the switch mode of operation, improve the power penetrability and present energy rate.It selects for use the electric capacity that ESL, ESR and temperature coefficient are little and ripple current is big to form, to obtain the low-loss high-frequency dynamic property.
According to little inverter power level novel topological structure that such scheme forms, its operation principle is following:
Referring to Fig. 1; In this topological circuit; Power switch tube S W1 and SW2 replace break-make work; Produce the high-frequency pulsed width modulation waveform of alternation, through the former limit winding N11 of double winding step-up transformer T1: secondary winding N21 or former limit winding N12: secondary winding N22 transformation is boosted, double winding step-up transformer T1 output alternating impulse high pressure; The alternating impulse high pressure is through half control or control power switch tube S W4, the control of SW3 half cycle alter switch entirely, obtains to the alternating voltage waveform of passive load or the ac current waveform output of passive load.
When power switch tube S W1 by conducting become by the time, former limit winding N11, the power switch tube S W2 back of the body connects diode and input capacitance C11 and C12 and forms and feedback passage, the absorbing high-frequency switch spike is also feedback high-frequency electrical energy.
Otherwise when power switch tube S W2 from conducting become by the time; Then connect diode and input capacitance C11 and C12 and formed feedback path by former limit winding N12, the power switch tube S W1 back of the body, absorption tube turn-offs the spike waveform of period appearance and this high-frequency electrical energy is delivered to the former limit of transformer.
Referring to Fig. 2; It is depicted as the little inverter power level of grid type novel topological structure; It comprises double winding step-up transformer T1, power switch tube S W1, SW2, the half control of solar photovoltaic battery component phc, ad hoc structure or controls switching tube SW4, SW3 entirely, and input capacitance C11 and C12 and a pair of flat ripple inductance L 2 (when being connected active load).
Consistent among the topological structure that relates among this embodiment and the embodiment 1, do not give unnecessary details here.
For satisfying the requirement of parallel network reverse; The secondary winding N21 of double winding step-up transformer T1, N22 be through half control or control the alternating current circuit that switching tube SW4, SW3 form entirely and be connected to a pair of flat ripple inductance L 2 in this instance, and be connected to active load R through a pair of flat ripple inductance L 2.
The enforcement principle of this structure is not given unnecessary details with above-mentioned consistent here.
By on can know; The present invention takes the working method that the positive and negative commendable increase of the two winding transformer T1 of ad hoc structure is pressed and PWM switch modulation secondary sinusoidal wave half cycle alter switch in former limit is controlled; Realized orthogonal transformation of electrical energy and power transmission, and improved former and deputy limit winding work wave, solved afterflow spike overshoot voltage problem through the back coupling mode; Reduce the radio-frequency component loss; And reduce half control or control the power switch pipe number of connection entirely and switch working loss and on-state loss through half cycle alternation mode, under the situation that keeps high step-up ratio and ideal transformation and inversion waveform, obtain very high conversion and inversion system efficient.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection range to be defined by appending claims and equivalent thereof.
Claims (6)
1. little inverter power level novel topological structure; It is characterized in that; Said topological structure comprises double winding step-up transformer, first power switch pipe and second power switch pipe, first half control or controls power switch pipe entirely and second half control or control power switch pipe, first input capacitance and second input capacitance entirely; Former limit first winding end of the same name of said double winding step-up transformer and the former limit second winding non-same polarity are connected to the positive pole of solar photovoltaic battery component, and the former limit first winding non-same polarity of said double winding step-up transformer and former limit second winding end of the same name are connected to the negative pole of solar photovoltaic battery component respectively through said first power switch pipe and second power switch pipe; Secondary first winding of said double winding step-up transformer and secondary second winding are respectively through said first half control or control power switch pipe entirely and second half control or control power switch pipe entirely and be connected to load; One nonpolarity end of the positive ends of said input first input capacitance and second input capacitance is connected to the positive pole of solar photovoltaic battery component, and another nonpolarity end of the negative polarity end of first input capacitance and second input capacitance is connected to the negative pole of solar photovoltaic battery component; Said first half control or control power switch pipe entirely and second half control or control the output of power switch pipe entirely; To be connected to buffer capacitor and passive load like need from the net inversion; As need parallel network reverse then to be connected to flat ripple inductance, and be connected to active load through said flat ripple inductance.
2. little inverter power level novel topological structure according to claim 1 is characterized in that, said first power switch pipe and second power switch pipe are MOSFET or IGBT pipe, are used for the control of PWM waveform modulated switch.
3. little inverter power level novel topological structure according to claim 1 is characterized in that, the magnetic core of said double winding step-up transformer is particular iron oxysome, slim amorphous alloy film, the senior electrical steel sheet of orientation or the senior electrical steel sheet of non-orientation.
4. according to claim 1 or 3 described little inverter power level novel topological structures, it is characterized in that, said double winding step-up transformer be the two groups of former limit first winding and second winding and around and the different name end interconnection of former limit first winding and second winding; The two groups of secondary first winding and second winding and around and independent separately, said former limit first winding and second winding, secondary first winding and second winding are taked two-wire or multi-thread and form around mode.
5. little inverter power level novel topological structure according to claim 1; It is characterized in that; Said first half control or control power switch pipe entirely and second half control or control power switch pipe entirely and be half control SCR pipe or control specific MOSFET or IGBT entirely is used for positive and negative half cycle alternation output switch control on the inversion sine wave period.
6. little inverter power level novel topological structure according to claim 1 and 2; It is characterized in that said first power switch pipe, second power switch pipe, former limit first winding, former limit second winding and first electric capacity, second electric capacity can provide feedback path.
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| CN2010106047179A CN102545670A (en) | 2010-12-24 | 2010-12-24 | Novel power-level topological structure of micro inverter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103745701A (en) * | 2013-12-30 | 2014-04-23 | 深圳市华星光电技术有限公司 | Flyback boosting circuit, LED (light emitting diode) backlight driving circuit and liquid crystal display |
| CN106100432A (en) * | 2016-07-13 | 2016-11-09 | 杭州合宝电源有限公司 | A kind of piezoelectric ceramic atomizer patch drive circuit |
| CN106160546A (en) * | 2016-09-29 | 2016-11-23 | 苏州弘鹏新能源有限公司 | Multiple coil normal shock output-parallel single-stage inverter |
| CN109449878A (en) * | 2018-10-24 | 2019-03-08 | 湖南大学 | Low-voltage direct intelligent switch control system |
| CN112202356A (en) * | 2020-09-28 | 2021-01-08 | 天津津航计算技术研究所 | Boost-based quasi-Z-source single-stage isolation inverter topology circuit |
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| US6069807A (en) * | 1999-09-15 | 2000-05-30 | Lucent Technologies Inc. | Compensation circuit method of operations thereof and converter employing the same |
| CN1545195A (en) * | 2003-11-19 | 2004-11-10 | 南京航空航天大学 | Positive and negative excitation bidirectional DC-DC converter |
| CN2932802Y (en) * | 2006-04-23 | 2007-08-08 | 陈俊 | A novel integrated circuit float charger |
| CN101257263A (en) * | 2008-04-15 | 2008-09-03 | 张海波 | Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system |
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| US6069807A (en) * | 1999-09-15 | 2000-05-30 | Lucent Technologies Inc. | Compensation circuit method of operations thereof and converter employing the same |
| CN1545195A (en) * | 2003-11-19 | 2004-11-10 | 南京航空航天大学 | Positive and negative excitation bidirectional DC-DC converter |
| CN2932802Y (en) * | 2006-04-23 | 2007-08-08 | 陈俊 | A novel integrated circuit float charger |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103745701A (en) * | 2013-12-30 | 2014-04-23 | 深圳市华星光电技术有限公司 | Flyback boosting circuit, LED (light emitting diode) backlight driving circuit and liquid crystal display |
| CN103745701B (en) * | 2013-12-30 | 2016-05-04 | 深圳市华星光电技术有限公司 | Inverse-excitation type booster circuit, LED-backlit drive circuit and liquid crystal display |
| CN106100432A (en) * | 2016-07-13 | 2016-11-09 | 杭州合宝电源有限公司 | A kind of piezoelectric ceramic atomizer patch drive circuit |
| CN106160546A (en) * | 2016-09-29 | 2016-11-23 | 苏州弘鹏新能源有限公司 | Multiple coil normal shock output-parallel single-stage inverter |
| CN109449878A (en) * | 2018-10-24 | 2019-03-08 | 湖南大学 | Low-voltage direct intelligent switch control system |
| CN112202356A (en) * | 2020-09-28 | 2021-01-08 | 天津津航计算技术研究所 | Boost-based quasi-Z-source single-stage isolation inverter topology circuit |
| CN112202356B (en) * | 2020-09-28 | 2022-05-27 | 天津津航计算技术研究所 | Boost-based quasi-Z-source single-stage isolation inverter topology circuit |
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Application publication date: 20120704 |