CN103226374B - Maximum power point tracking circuit of constant flow source control photovoltaic panel - Google Patents
Maximum power point tracking circuit of constant flow source control photovoltaic panel Download PDFInfo
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- CN103226374B CN103226374B CN201310147299.9A CN201310147299A CN103226374B CN 103226374 B CN103226374 B CN 103226374B CN 201310147299 A CN201310147299 A CN 201310147299A CN 103226374 B CN103226374 B CN 103226374B
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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 invention discloses a maximum power point tracking circuit of a constant flow source control photovoltaic panel, which comprises a solar panel output voltage detecting circuit, a constant flow source control circuit and a Buck converter circuit, wherein the solar panel output voltage detecting circuit provides control signs to the constant flow source control circuit; the constant flow source control circuit provides incoming current dynamic control signals to the control chip of a Buck converter; the Buck converter is used for controlling the output voltage of the solar panel to be converted into an expected output voltage, and keeping the output voltage of the solar panel at a maximum power output voltage part. According to the invention, the Buck converter is used as a DC converter to lower the output voltage of the solar panel to an expected voltage, and the constant flow source control circuit is used for controlling the input current of the Buck converter, so as to be beneficial to the realization of high power density, high efficiency and the MPPT (maximum power point tracking) of the solar panel.
Description
Technical field
The present invention relates to is that a kind of constant current source is controlled photovoltaic panel MPPT maximum power point tracking circuit, and particularly a kind of miniwatt photovoltaic generation that is applied to provides electric energy for miniaturized electronics.
Background technology
Along with the day by day maturation of photovoltaic power generation technology, directly utilize solar panel to provide electric power to be widely used in the various aspects of people's productive life.
Along with the application of digit chip, be applicable to the MPPT technology comparatively ripe (disturbing the methods such as observation, conductance method as fixed step size) of middle high-power photovoltaic system.Be subject to the restriction of volume and cost, the MPPT technology that is applicable to miniwatt photovoltaic generating system needs further research (application such as domestic miniature inverter, portable electronic charging equipment).For miniwatt photovoltaic generating system, should consider the problems such as solar panel utilization factor, equipment cost, service efficiency and circuit protection.The output characteristics of solar panel has stronger nonlinear characteristic, and along with the difference of intensity of illumination and environment temperature, solar panel terminal voltage, output current and peak power output all can produce very large variation.The miniwatt photovoltaic power generation equipment of function admirable is on the high side at present, has limited the application of solar energy generation technology in miniwatt occasion.Therefore need the abundant operating characteristic in conjunction with photovoltaic panel, research is applicable to the high-performance of miniwatt occasion, the control technology of low-cost solar charging equipment.
Summary of the invention
Technical matters to be solved by this invention is for miniwatt solar panel generating occasion, has proposed low-cost, high efficiency constant pressure type solar panel MPPT implementation method.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Constant current source is controlled a photovoltaic panel MPPT maximum power point tracking circuit, comprises solar panel output voltage detecting circuit, constant current source control circuit, Buck converter circuit; Wherein said solar panel output voltage detecting circuit provides control signal for constant current source control circuit; The control chip that described constant current source control circuit is Buck converter circuit provides input current dynamic control signal, controls the input current of Buck converter circuit; Buck converter circuit is converted to the output voltage of expectation for controlling the output voltage of solar panel, the output voltage of solar panel is remained on to maximum power output voltage place.
As a kind of constant current source of the present invention, control the further prioritization scheme of photovoltaic panel MPPT maximum power point tracking circuit, described constant current source control circuit dynamically changes the current-limiting resistance resistance of Buck convertor controls chip, according to solar panel output voltage, set the input current of corresponding Buck transducer, to guarantee that solar panel is operated in peak power output point.
As a kind of constant current source of the present invention, control the further prioritization scheme of photovoltaic panel MPPT maximum power point tracking circuit, constant current source control circuit is mirror-image constant flow source circuit.
As a kind of constant current source of the present invention, control the further prioritization scheme of photovoltaic panel MPPT maximum power point tracking circuit, described constant current source control circuit comprises resistance, current-limiting resistance, electric capacity, a NPN triode and the 2nd NPN triode; Wherein, one end of described resistance is connected with the output terminal of solar panel output voltage detecting circuit, and the other end of resistance is connected with the base stage of a described NPN triode, the collector of the base stage of the 2nd NPN triode, a NPN triode respectively; The emitter of a described NPN triode is connected with the emitter of the 2nd NPN triode, the collector of described the 2nd NPN triode respectively with one end of current-limiting resistance, an input end of the control chip of one end of electric capacity and Buck converter circuit is connected, the other end of described current-limiting resistance, the other end of electric capacity are connected with another input end of the control chip of Buck converter circuit respectively;
Wherein: the base current of solar panel output voltage detecting circuit output voltage control the one NPN triode, by allowing a NPN triode be operated in linear zone, makes to produce different working currents at a NPN transistor collector; The 2nd NPN triode and a NPN triode form mirror-image constant flow source, produce the control electric current identical with a NPN transistor collector, and then on current-limiting resistance, produce different pressure drops on the collector of the 2nd NPN triode;
Current-limiting resistance forms the current-limiting resistance of the control chip of Buck converter circuit, together with the constant current source being flow through with the 2nd NPN transistor collector by the inner fixing constant current source of the control chip of Buck converter circuit, regulate the voltage on current-limiting resistance, dynamically control the input current of Buck converter circuit, realize the MPPT function of solar panel work.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
The present invention has advantages of that circuit component is few, power density is high and cost is low, by Real-Time Monitoring solar panel output voltage, provide signal for constant current source control circuit, the electric current that constant current source control circuit flows through in current-limiting resistance by adjusting is realized the control to Buck transducer input current, is conducive to realize the MPPT of high power density, high-level efficiency and solar panel.Compare with the patent 201210385278.6 of applicant application, this patent is not subject to the restriction of comparer supply voltage, can be operated in more under high solar panel output voltage condition, and the dynamic perfromance of constant current source control circuit is excellent simultaneously, and degree of accuracy is high.
Accompanying drawing explanation
Fig. 1 is principle framework schematic diagram of the present invention.
Fig. 2 is that solar panel voltage, electric current and power vary with temperature schematic diagram.
Fig. 3 is the preferred embodiments of the present invention implementation method schematic diagram.
Number in the figure: 301-solar panel output voltage detecting circuit; 302-constant current source control circuit; 303-Buck converter circuit.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
Constant voltage tracing (CVT) can Maximum Power Output by what set that the best effort open-circuit voltage of solar cell guarantees photovoltaic panel, CVT mode have control simple, reliability is high, good stability and be easy to the advantages such as realization.The present invention mainly applies CVT technology to realize the control to solar panel peak power output.
As shown in Figure 1, it has provided principle framework figure of the present invention.Photovoltaic panel is electric energy by light energy conversion and forms output voltage at output terminal; By solar panel output voltage detecting circuit, provide reference signal for constant current source control circuit; Constant current source control circuit dynamic adjustments flows through the electric current of current-limiting resistance; Buck transducer is controlled solar panel output voltage by control inputs power; The output voltage of Buck transducer provides the operating voltage of expectation for load.
As shown in Figure 2 the typical electric characteristic figure of solar panel, visible its output characteristics has stronger nonlinear characteristic, along with the difference of intensity of illumination and environment temperature, solar panel terminal voltage, output current and peak power output all can produce very large variation.When environment temperature one regularly, under different illumination conditions on the impact of photovoltaic panel output electrical specification as shown in the figure.The different intensities of illumination output current that only has the greatest impact, and the impact of open-circuit voltage can be ignored.Illumination is stronger, and the exportable maximum power point of panel is higher.And the corresponding output voltage V of maximum power point
pmcan be similar to and think constant.
As shown in Figure 3, its a kind of constant current source that has provided preferred embodiment of the present invention is controlled photovoltaic panel MPPT maximum power point tracking circuit diagram.
The function of block diagram 301, for providing solar panel output voltage to detect, consists of resistance R 1-R4, stabilivolt Z1, capacitor C 1 and comparer IC2.When solar panel output voltage is higher than setting value, the output voltage of controlling comparer IC2 is also high; When solar panel output voltage is lower than setting value, the output voltage of controlling comparer IC2 is also low.
The function of block diagram 302 is constant current source control circuit, resistance R 5-R6, capacitor C 2 and NPN triode Q1 and Q3, consists of.The base current of IC2 output voltage control Q1 pipe in solar panel output voltage detecting circuit, by allowing the work of Q1 pipe produce different working currents in linear zone at collector.Due to Q1 and Q3 pipe formation mirror-image constant flow source, therefore on the collector of Q3 pipe, also produce identical control electric current, on current-limiting resistance R6, can produce different pressure drops.
The function of block diagram 303 is for being converted to the output voltage of solar panel in the output voltage of expectation, the Buck transducer consisting of resistance R 7-R10, capacitor C 3-C6, inductance L 1, sustained diode 1, P channel mosfet Q2 and control chip IC1.Resistance R 6 forms the current-limiting resistance of IC1 control chips, regulates R6 upper voltage together with the constant current source being flow through by the inner fixing constant current source of control chip IC1 with Q3 collector, dynamically controls the input current of Buck transducer, realizes the MPPT function of solar panel work.
The design parameter of preferred embodiment of the present invention is as follows:
Solar panel input voltage can be 12VDC-75VDC; Output voltage 12VDC; Output current 1A; Output inductor L1 is 68 μ H; Output filter capacitor C1 is 1000 μ F; Current limliting P channel mosfet is Si2343; Main switch Q2 is Si4485; IC1 control chip is LM25085, and the switching frequency of setting is 300kHz; IC2 control chip is comparer LM2903.
In the present invention, Buck transducer is for being down to solar panel output voltage load end expectation voltage; Described solar panel output voltage detects provides control output voltage signal; Described constant current source control circuit link is according to solar panel output voltage detecting circuit signal, the electric current on current-limiting resistance is flow through in control, the maximum input current of setting Buck transducer, remains on maximum power output voltage place by the output voltage of solar panel.
Claims (4)
1. constant current source is controlled a photovoltaic panel MPPT maximum power point tracking circuit, it is characterized in that: comprise solar panel output voltage detecting circuit, constant current source control circuit, Buck converter circuit; Wherein said solar panel output voltage detecting circuit provides control signal for constant current source control circuit; The control chip that described constant current source control circuit is Buck converter circuit provides input current dynamic control signal, controls the input current of Buck converter circuit; Buck converter circuit is converted to the output voltage of expectation for controlling the output voltage of solar panel, the output voltage of solar panel is remained on to maximum power output voltage place.
2. a kind of constant current source according to claim 1 is controlled photovoltaic panel MPPT maximum power point tracking circuit, it is characterized in that: described constant current source control circuit dynamically changes the current-limiting resistance resistance of Buck convertor controls chip, according to solar panel output voltage, set the input current of corresponding Buck transducer, to guarantee that solar panel is operated in peak power output point.
3. a kind of constant current source according to claim 1 is controlled photovoltaic panel MPPT maximum power point tracking circuit, it is characterized in that: constant current source control circuit is mirror-image constant flow source circuit.
4. a kind of constant current source according to claim 1 is controlled photovoltaic panel MPPT maximum power point tracking circuit, it is characterized in that:
Described constant current source control circuit comprises the first resistance (R5), the second resistance (R6), electric capacity (C2), a NPN triode (Q1) and the 2nd NPN triode (Q3); Wherein, one end of described the first resistance (R5) is connected with the output terminal of solar panel output voltage detecting circuit, and the other end of the first resistance (R5) is connected with the base stage of a described NPN triode (Q1), the collector of the base stage of the 2nd NPN triode (Q3), a NPN triode (Q1) respectively; The emitter of a described NPN triode (Q1) is connected with the emitter of the 2nd NPN triode (Q3), the collector of described the 2nd NPN triode (Q3) is connected with an input end of one end, one end of electric capacity (C2) and the control chip of Buck converter circuit of the second resistance (R6) respectively, and the other end of the other end of described the second resistance (R6), electric capacity (C2) is connected with another input end of the control chip of Buck converter circuit respectively;
Wherein: the base current of solar panel output voltage detecting circuit output voltage control the one NPN triode (Q1), by allowing a NPN triode (Q1) be operated in linear zone, make to produce different working currents at NPN triode (Q1) collector; The 2nd NPN triode (Q3) and a NPN triode (Q1) form mirror-image constant flow source, on the collector of the 2nd NPN triode (Q3), produce the control electric current identical with NPN triode (Q1) collector, and then in the different pressure drop of the upper generation of the second resistance (R6);
The second resistance (R6) forms the current-limiting resistance of the control chip of Buck converter circuit, together with the constant current source being flow through with the 2nd NPN triode (Q3) collector by the inner fixing constant current source of the control chip of Buck converter circuit, regulate the voltage on the second resistance (R6), dynamically control the input current of Buck converter circuit, realize the MPPT function of solar panel work.
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| CN201310147299.9A CN103226374B (en) | 2013-04-25 | 2013-04-25 | Maximum power point tracking circuit of constant flow source control photovoltaic panel |
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| CN201310147299.9A CN103226374B (en) | 2013-04-25 | 2013-04-25 | Maximum power point tracking circuit of constant flow source control photovoltaic panel |
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| CN103226374B true CN103226374B (en) | 2014-12-10 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825449B (en) * | 2014-01-17 | 2016-08-24 | 深圳金仕盾照明科技有限公司 | A kind of MPPT controller for solar |
| CN104615190B (en) * | 2015-02-15 | 2017-06-20 | 上能电气股份有限公司 | The control method of MPPT optimizers in a kind of photovoltaic generating system |
| CN108023400A (en) * | 2018-01-15 | 2018-05-11 | 东汉太阳能无人机技术有限公司 | Solar energy unmanned plane MPPT controller and the electric power system equipped with the controller |
| CN108809145B (en) * | 2018-04-24 | 2019-12-13 | 西安电子科技大学 | Maximum power point tracking control piezoelectric energy acquisition circuit |
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| CN102361415A (en) * | 2011-05-12 | 2012-02-22 | 嘉应学院 | Power device for simulating volt-ampere characteristics of photovoltaic battery |
| CN102510641A (en) * | 2011-12-27 | 2012-06-20 | 闫晓金 | Composite energy storage power supply for solar LED (light-emitting diode) street lamp |
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| US20080037305A1 (en) * | 2003-02-21 | 2008-02-14 | Distributed Power, Inc. | Monopolar dc to bipolar dc to ac converter |
| US20070035975A1 (en) * | 2005-08-10 | 2007-02-15 | Distributed Power, Inc. | Photovoltaic dc-to-ac power converter and control method |
| CN101777777A (en) * | 2009-01-13 | 2010-07-14 | 周德佳 | Direct current voltage regulation-based maximum power point tracking method for photovoltaic array with stable charging circuit |
| CN102361415A (en) * | 2011-05-12 | 2012-02-22 | 嘉应学院 | Power device for simulating volt-ampere characteristics of photovoltaic battery |
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Application publication date: 20130731 Assignee: Jiangsu Nanyou IOT Technology Park Ltd. Assignor: Nanjing Post & Telecommunication Univ. Contract record no.: 2016320000221 Denomination of invention: Maximum power point tracking circuit of constant flow source control photovoltaic panel Granted publication date: 20141210 License type: Common License Record date: 20161129 |
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Effective date of registration: 20180110 Address after: 710000 the third floor of the office building, No. 388, space center, space base, Xi'an, Shaanxi Patentee after: Xi'an Longji clean energy Co. Ltd. Address before: 210013, 66 new model street, Gulou District, Jiangsu, Nanjing Patentee before: Nanjing Post & Telecommunication Univ. |
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Assignee: Jiangsu Nanyou IOT Technology Park Ltd. Assignor: Nanjing Post & Telecommunication Univ. Contract record no.: 2016320000221 Date of cancellation: 20180116 |
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