CN103226374A - 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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- CN103226374A CN103226374A CN2013101472999A CN201310147299A CN103226374A CN 103226374 A CN103226374 A CN 103226374A CN 2013101472999 A CN2013101472999 A CN 2013101472999A CN 201310147299 A CN201310147299 A CN 201310147299A CN 103226374 A CN103226374 A CN 103226374A
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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
- 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 a kind of constant current source control 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 maturation day by day 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, the MPPT technology of high-power photovoltaic system comparatively ripe (disturbing methods such as observation, conductance method as fixed step size) in being applicable to.Be subjected to the restriction of volume and cost, be applicable to that the MPPT technology of miniwatt photovoltaic generating system then needs further research (application such as domestic miniature inverter, portable electronic charging equipment).Should take all factors into consideration problems such as solar panel utilization factor, equipment cost, service efficiency and circuit protection for the miniwatt photovoltaic generating system.The output characteristics of solar panel has stronger nonlinear characteristic, different along with intensity of illumination and environment temperature, and solar panel terminal voltage, output current and peak power output all can produce very big variation.The miniwatt photovoltaic generation equipment price of function admirable is higher at present, has limited the application of solar energy generation technology in the miniwatt occasion.Therefore need 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 at 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:
A kind of constant current source control 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; Described constant current source control circuit provides the input current dynamic control signal for the control chip of Buck converter circuit, the input current of control Buck converter circuit; The output voltage that the Buck converter circuit is used to control solar panel is converted to the output voltage of expectation, and the output voltage of solar panel is remained on peak power output voltage place.
As the further prioritization scheme of a kind of constant current source control photovoltaic panel MPPT maximum power point tracking circuit of the present invention, described constant current source control circuit dynamically changes the current-limiting resistance resistance of Buck convertor controls chip, set the input current of corresponding Buck transducer according to the solar panel output voltage, be operated in the peak power output point to guarantee solar panel.
As the further prioritization scheme of a kind of constant current source control photovoltaic panel MPPT maximum power point tracking circuit of the present invention, constant current source control circuit is the mirror-image constant flow source circuit.
As the further prioritization scheme of a kind of constant current source control photovoltaic panel MPPT maximum power point tracking circuit of the present invention, described constant current source control circuit comprises resistance, current-limiting resistance, electric capacity, a NPN triode and the 2nd NPN triode; Wherein, an 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 base stage of the 2nd NPN triode, the collector of 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 is connected with an input end of the control chip of end of an end of current-limiting resistance, electric capacity and Buck converter circuit respectively, and 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: solar panel output voltage detecting circuit output voltage is controlled the base current of a 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 a NPN triode and a NPN triode constitute mirror-image constant flow source, produce and the identical Control current of a NPN transistor collector on the collector of the 2nd NPN triode, and then produce different pressure drops on current-limiting resistance;
Current-limiting resistance constitutes the current-limiting resistance of the control chip of Buck converter circuit, the constant current source that is flow through with the 2nd NPN transistor collector by the constant current source of the control chip internal fixation of Buck converter circuit is regulated the voltage on the 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 the advantage that circuit component is few, power density is high and cost is low, provide signal by real-time monitoring solar panel output voltage for constant current source control circuit, constant current source control circuit flows through electric current in the current-limiting resistance by adjusting and realizes control to Buck transducer input current, helps realizing 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 subjected to the restriction of comparer supply voltage, can be operated in more under the high solar panel output voltage condition, and the dynamic perfromance of constant current source control circuit is excellent simultaneously, the degree of accuracy height.
Description of drawings
Fig. 1 is a principle framework synoptic diagram of the present invention.
Fig. 2 is that solar panel voltage, electric current and power vary with temperature synoptic diagram.
Fig. 3 is the preferred embodiments of the present invention implementation method synoptic diagram.
Number in the figure: 301-solar panel output voltage detecting circuit; The 302-constant current source control circuit; The 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) by the best effort open-circuit voltage of setting solar cell guarantee photovoltaic panel can Maximum Power Output, the CVT mode has that control is simple, reliability is high, good stability and be easy to advantage such as realization.The present invention mainly uses the CVT technology to realize the control to the solar panel peak power output.
As shown in Figure 1, it has provided principle framework figure of the present invention.The photovoltaic panel is converted into luminous energy electric energy and forms output voltage at output terminal; Provide reference signal by the solar panel output voltage detecting circuit for constant current source control circuit; The constant current source control circuit dynamic adjustments flows through the electric current of current-limiting resistance; The Buck transducer is by control power input control solar panel output voltage; 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, as seen its output characteristics has stronger nonlinear characteristic, different along with intensity of illumination and environment temperature, solar panel terminal voltage, output current and peak power output all can produce very big variation.When environment temperature one regularly, under different illumination conditions to the influence 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 can ignore to the influence of open-circuit voltage.Illumination is strong more, and the exportable maximum power point of panel is high more.And the pairing output voltage V of maximum power point
PmCan be similar to and think constant.
As shown in Figure 3, it has provided a kind of constant current source control photovoltaic panel MPPT maximum power point tracking circuit diagram of preferred embodiment of the present invention.
The function of block diagram 301 detects for the solar panel output voltage is provided, and is made of resistance R 1-R4, stabilivolt Z1, capacitor C 1 and comparer IC2.When the solar panel output voltage is higher than setting value, the output voltage of control comparer IC2 also be a height; When the solar panel output voltage is lower than setting value, the output voltage of control comparer IC2 also is low.
The function of block diagram 302 is a constant current source control circuit, is made of resistance R 5-R6, capacitor C 2 and NPN triode Q1 and Q3.The base current of IC2 output voltage control Q1 pipe in the solar panel output voltage detecting circuit is by allowing the Q1 plumber do to produce different working currents at linear zone at collector.Because Q1 and Q3 pipe constitute mirror-image constant flow source, therefore also produce identical Control current on the collector of Q3 pipe, can produce different pressure drops on current-limiting resistance R6.
The function of block diagram 303 is for being converted to the output voltage of solar panel the output voltage of expectation, the Buck transducer that is made 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 constitutes the current-limiting resistance of IC1 control chips, and the constant current source that is flow through with the Q3 collector by the constant current source of control chip IC1 internal fixation is regulated R6 and gone up voltage, dynamically controls the input current of Buck transducer, realizes the MPPT function of solar panel work.
The concrete parameter of preferred embodiment of the present invention is as follows:
The 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; The IC1 control chip is LM25085, and the switching frequency of setting is 300kHz; The IC2 control chip is comparer LM2903.
In the present invention, the Buck transducer is for reducing to the solar panel output voltage load end expectation voltage; Described solar panel output voltage detects provides the 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 the current-limiting resistance is flow through in control, set the maximum input current of Buck transducer, the output voltage of solar panel is remained on peak power output voltage place.
Claims (4)
1. a constant current source control photovoltaic panel MPPT maximum power point tracking circuit 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; Described constant current source control circuit provides the input current dynamic control signal for the control chip of Buck converter circuit, the input current of control Buck converter circuit; The output voltage that the Buck converter circuit is used to control solar panel is converted to the output voltage of expectation, and the output voltage of solar panel is remained on peak power output voltage place.
2. a kind of constant current source control photovoltaic panel MPPT maximum power point tracking circuit according to claim 1, it is characterized in that: described constant current source control circuit dynamically changes the current-limiting resistance resistance of Buck convertor controls chip, set the input current of corresponding Buck transducer according to the solar panel output voltage, be operated in the peak power output point to guarantee solar panel.
3. a kind of constant current source control photovoltaic panel MPPT maximum power point tracking circuit according to claim 1, it is characterized in that: constant current source control circuit is the mirror-image constant flow source circuit.
4. a kind of constant current source control photovoltaic panel MPPT maximum power point tracking circuit according to claim 1 is characterized in that:
Described constant current source control circuit comprises first resistance (R5), second resistance (R6), electric capacity (C2), a NPN triode (Q1) and the 2nd NPN triode (Q3); Wherein, one end of described first resistance (R5) is connected with the output terminal of solar panel output voltage detecting circuit, and the other end of first resistance (R5) is connected with the base stage of a described NPN triode (Q1), the base stage of the 2nd NPN triode (Q3), the collector of 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 the control chip of end of an end of second resistance (R6), electric capacity (C2) and Buck converter circuit respectively, and the other end of the other end of described second resistance (R6), electric capacity (C2) is connected with another input end of the control chip of Buck converter circuit respectively;
Wherein: solar panel output voltage detecting circuit output voltage is controlled the base current of a 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 a NPN triode (Q3) and a NPN triode (Q1) constitute mirror-image constant flow source, produce and the identical Control current of NPN triode (Q1) collector on the collector of the 2nd NPN triode (Q3), and then go up the different pressure drop of generation at second resistance (R6);
Second resistance (R6) constitutes the current-limiting resistance of the control chip of Buck converter circuit, the constant current source that is flow through with the 2nd NPN triode (Q3) collector by the constant current source of the control chip internal fixation of Buck converter circuit is regulated the voltage on 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103825449A (en) * | 2014-01-17 | 2014-05-28 | 青岛尚慧信息技术有限公司 | MPPT (Maximum Power Point Tracking) solar controller |
| CN104615190A (en) * | 2015-02-15 | 2015-05-13 | 无锡上能新能源有限公司 | Control method of MPPT (maximum power point tracking) optimizer of photovoltaic power generation system |
| CN108809145A (en) * | 2018-04-24 | 2018-11-13 | 西安电子科技大学 | A kind of MPPT maximum power point tracking control piezoelectric energy acquisition circuit |
| WO2019136879A1 (en) * | 2018-01-15 | 2019-07-18 | 东汉太阳能无人机技术有限公司 | Mppt controller and power supply system provided with controller |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825449A (en) * | 2014-01-17 | 2014-05-28 | 青岛尚慧信息技术有限公司 | MPPT (Maximum Power Point Tracking) solar controller |
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| CN104615190A (en) * | 2015-02-15 | 2015-05-13 | 无锡上能新能源有限公司 | Control method of MPPT (maximum power point tracking) optimizer of photovoltaic power generation system |
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| WO2019136879A1 (en) * | 2018-01-15 | 2019-07-18 | 东汉太阳能无人机技术有限公司 | Mppt controller and power supply system provided with controller |
| CN108809145A (en) * | 2018-04-24 | 2018-11-13 | 西安电子科技大学 | A kind of MPPT maximum power point tracking control piezoelectric energy acquisition circuit |
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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 |