CN108899987A - A kind of solar charging electric control circuit with MPPT function - Google Patents
A kind of solar charging electric control circuit with MPPT function Download PDFInfo
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- CN108899987A CN108899987A CN201811114189.1A CN201811114189A CN108899987A CN 108899987 A CN108899987 A CN 108899987A CN 201811114189 A CN201811114189 A CN 201811114189A CN 108899987 A CN108899987 A CN 108899987A
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- pin
- module
- resistance
- operational amplifier
- voltage stabilizer
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The present invention relates to a kind of solar charging electric control circuits with MPPT function.Circuit is by photovoltaic battery panel, DC-DC module, battery, LDO voltage stabilizer, operational amplifier, diode, capacitor, resistance R1~R4 composition.Photovoltaic battery panel is connected with DC-DC module, and DC-DC module is connected to the battery.LDO voltage stabilizer is connected with photovoltaic battery panel；Output end is connected with resistance R3.Operational amplifier pin 3 is connected with another pin of resistance R3；Pin 2 is connected with resistance R1, R2；Pin 8 is connected with LDO voltage stabilizer；Pin 1 is connected with DC-DC module.The anode of diode is connected with the pin 3 of operational amplifier；Cathode is connected with resistance R4's.Capacitor is connected with LDO voltage stabilizer.Compared with prior art, the beneficial effects of the invention are as follows：Circuit structure knot is simple, high reliablity, at low cost, small power consumption, fast response time, while also having temperature compensation function, particularly suitable for small-power and cost compared with using on sensitive equipment.
Description
Technical field
The present invention relates to a kind of solar charging electric control circuits, particularly relate to a kind of solar energy with MPPT function
Charging control circuit.
Background technique
Solar energy be a kind of cleaning, efficiently, low-carbon environment-friendly and never exhausted green energy resource, with current wind energy, nuclear energy, tide
The new energy such as nighttide energy are compared, and solar energy is optimal the most abundant renewable energy.Photovoltaic cell is that one kind can be by luminous energy
It is converted into the device of electric energy, with accumulators store electric energy, still can power at night for equipment, be particularly suitable for powering without power grid
Place use.The intrinsic characteristic of photovoltaic cell, output maximum power point near 0.78 times of output open circuit voltage, but
It will receive the such environmental effects such as illumination, temperature.MPPT maximum power point tracking (Maximum Power Point Tracking, letter
Claim MPPT) charge controller can make photovoltaic cell with approach maximum power to battery charge, make full use of solar energy resources,
The utilization rate and charge efficiency for improving photovoltaic cell capable of generating power, can reduce the area of photovoltaic battery panel or the capacity of battery, thus
Reduce the cost of solar power system.How to allow photovoltaic cell electricity as much as possible by accumulators store,
Realize that the charge controller of MPPT function has become a hot topic of research.
For this purpose, domestic expert has made intensive studies, various MPPT charge controllers have been invented.CN201410514299.2
A kind of photovoltaic cell MPPT system is disclosed, when external environment or battery variation, photovoltaic cell can work in maximum
Power points attachment, to improve the utilization efficiency of photovoltaic cell.CN201510330390.3 discloses a kind of MPPT current constant control dress
It sets, after MPPT constant-current control circuit obtains the data of voltage and current acquisition, genetic algorithm is based on using above-mentioned by control module
Data calculate maximum power point, and are controlled by MPPT constant-current control circuit according to the maximum power point that control module obtains
System, to improve the photoelectric conversion efficiency of photovoltaic control.CN201710009945.3 disclose a kind of MPPT control method and its
Device, the realtime power for capableing of direct basis battery find the maximum power point voltage of solar panel, accuracy it is high and
It is high-efficient.Although the above invention has the function of MPPT, microprocessor and more peripheral circuit is needed to constitute, circuit is more
Complexity needs software and hardware cooperation to be just able to achieve, and difficulty is big, at high cost.Therefore it is badly in need of designing one kind woth no need to microprocessor, circuit
Simply, solar charging electric control circuit at low cost and with MPPT function.
Summary of the invention
It is an object of that present invention to provide a kind of solar charging electric control circuits with MPPT function, overcome existing charging
Control circuit scheme is complicated, realizes big, the at high cost problem of difficulty.
In order to achieve the above objectives, technical solution of the present invention and measure be：
Solar charging electric control circuit with MPPT function is by photovoltaic battery panel, DC-DC module, battery, LDO voltage stabilizer,
Operational amplifier and diode, capacitor, resistance R1~R4 composition.Wherein：
1）Photovoltaic battery panel anode is connected with DC-DC module input terminal, LDO voltage stabilizer input terminal；
2）Operational amplifier pin 3, pin 8 are connected with LDO voltage stabilizer output end；
3）Operational amplifier pin 1 is connected with the feedback end of DC-DC module；
4）Battery positive voltage is connected with DC-DC module output end；
5）Photovoltaic battery panel cathode, DC-DC module ground terminal, battery terminal negative, LDO voltage stabilizer ground terminal, operational amplifier
Pin 4 is grounded.
The photovoltaic battery panel, anode are grounded after also connecting with resistance R1, R2.
The DC-DC module can use boost module or voltage reduction module.
The operational amplifier, the line between pin 2 and series resistance R1, R2 are connected.
The operational amplifier, when pin 3 is connected with LDO voltage stabilizer output end, bypass is also parallel with resistance R3.
The LDO voltage stabilizer output end is also serially connected with capacitor, while the other end ground connection of capacitor.
The operational amplifier, pin 3 have been sequentially connected in series diode and resistance R4, while the one end resistance R4 and two poles
Pipe cathode is connected, other end ground connection.
When photovoltaic battery panel, which shines upon, starts power generation, provided after LDO voltage stabilizer U1 decompression for operational amplifier
Stable voltage.The voltage that resistance R1, R2 export photovoltaic battery panel is sent to operational amplifier pin 2 after dividing is made
For sampled voltage；The voltage that resistance R3, R4, diode pair LDO voltage stabilizer are exported is sent to operational amplifier after being divided
Pin 3 is used as reference voltage.After operational amplifier is amplified according to the voltage of above-mentioned pin 2 and pin 3, by operational amplifier
1 output voltage of pin be sent to the feedback end of DC-DC module and equally also change to control the size of DC-DC module output voltage
The charging current of battery, to make the output voltage stabilization of photovoltaic battery panel in preset value.Preset value can be by changing electricity
The intrinsic standoff ratio of R1, R2 and resistance R3, R4 are hindered to adjust, and are arranged near 0.78 times of photovoltaic battery panel open-circuit voltage.
If photovoltaic battery panel is divided because shining upon enhancing so that output voltage has raised trend through resistance R1, R2
To sampled voltage also increase, due to be inverting input terminal voltage rise, operational amplifier amplification after output pressure drop it is low,
The control that DC-DC module is declined by feedback end voltage, output voltage can increase, at this point, the charging current of battery also increases therewith
Greatly, the output voltage of photovoltaic battery panel is made to rapidly drop to preset value.If photovoltaic battery panel weakens because shining upon so that output
Voltage has the tendency that reduction, and the sampled voltage divided through resistance R1, R2 also reduces, due to being inverting input terminal voltage drop
It is low, therefore output pressure increases after operational amplifier amplification, DC-DC module is by the raised control of feedback end voltage, output voltage meeting
It reduces, at this point, the charging current of battery also reduces therewith, the output voltage of photovoltaic battery panel is made to be climbed to preset value,
Realize the purpose that photovoltaic battery panel always works in maximum power point.
Diode is as temperature-compensating, when the temperature varies, can change the base of the pin 3 of operational amplifier automatically
Quasi- voltage.When temperature increases, reference voltage is reduced, and reduces the output voltage preset value of photovoltaic battery panel；When temperature reduces, base
Quasi- voltage increases, and increases the output voltage preset value of photovoltaic battery panel.Photovoltaic battery panel can be overcome to be affected by temperature maximum work
The problem of rate point voltage change.
When photovoltaic battery panel does not generate electricity, LDO voltage stabilizer, operational amplifier, DC-DC module do not work, do not consume storage
The electric energy of battery.
Compared with prior art, the beneficial effects of the invention are as follows：
The solar charging electric control circuit realized using DC-DC module and a small number of element, circuit structure knot is simple, high reliablity, at
This low, small power consumption, fast response time, while also having temperature compensation function is set particularly suitable for small-power and cost are more sensitive
Standby upper use.
Detailed description of the invention
Fig. 1 is the embodiment hardware circuit diagram of solar charging electric control circuit of the present invention.
Specific embodiment
The purpose of the present invention, feature and advantage will be described in detail by embodiment and in conjunction with attached drawing.In the present invention
The replacement of other models with same or similar function can be used in all elements, and the circuit after also belongs to this patent protection
Range.
Below in conjunction with attached drawing, specific structure and embodiment of the invention are described in detail.
In Fig. 1,100 be photovoltaic battery panel, and 101 be DC-DC module, and 102 be battery, and U1 is LDO voltage stabilizer, and U2 is fortune
Amplifier is calculated, D1 is diode, and C1 is capacitor, and R1~R4 is resistance.
V1+ it is photovoltaic battery panel（100）Anode, V1It is photovoltaic battery panel（100）Cathode；
V2+ it is battery（102）Anode, V2It is battery（102）Cathode；
Vin-1 is DC-DC module（101）Input terminal, Vout-1 is DC-DC module（101）Output end；
Vin-2 is LDO voltage stabilizer（U1）Input terminal, Vout-2 is LDO voltage stabilizer（U1）Output end；
GND-1 is DC-DC module（101）Ground terminal；
The LDO voltage stabilizer that GND-2 is（U1）Ground terminal；
Pin 1, pin 2, pin 3, pin 4, pin 8 are respectively operational amplifier（U2）Pin；
FB is DC-DC module（101）Feedback end.
Photovoltaic battery panel（100）Anode（V1+）With DC-DC module（101）Input terminal（Vin-1）It is connected, cathode（V1-）
Ground connection.DC-DC module（101）Output end（Vout-1）With battery（102）Anode（V2+）It is connected, ground terminal（GND-1）It connects
Ground.DC-DC module（101）Boost module or voltage reduction module can be used.Battery（102）Cathode（V2-）Ground connection.LDO is steady
Depressor（U1）Input terminal（Vin-2）With photovoltaic battery panel（100）Anode（V1+）It is connected；LDO voltage stabilizer（U1）Output end
（Vout-2）It is connected with the one end resistance R3；LDO voltage stabilizer（U1）Ground terminal（GND-2）Ground connection.Operational amplifier（U2）Draw
Foot 3 is connected with another pin of resistance R3；Pin 2 is connected with a pin of resistance R1, R2；Pin 8 and LDO voltage stabilizer（U1）It is defeated
Outlet（Vout-2）It is connected；Pin 4 is grounded；Pin 1 and DC-DC module（101）Feedback end（FB）It is connected.Diode（D1）'s
Anode and operational amplifier（U2）Pin 3 be connected；Cathode is connected with a pin of resistance R4.Another pin and light of resistance R1
Lie prostrate solar panel（100）Anode（V1+）It is connected.Another pin of resistance R2, R4 are grounded.Capacitor（C1）A pin and LDO pressure stabilizing
Device（U1）Output end（Vout-2）It is connected；Another pin ground connection.
Work as photovoltaic battery panel（100）Shine upon start power generation when, through LDO voltage stabilizer（U1）It is operation amplifier after decompression
Device（U2）Stable voltage is provided.Resistance R1, R2 are to photovoltaic battery panel（100）The voltage exported is sent to operation after being divided
Amplifier（U2）Pin 2 be used as sampled voltage；Resistance R3, R4, diode（D1）To LDO voltage stabilizer（U1）The voltage exported
Operational amplifier is sent to after being divided（U2）Pin 3 be used as reference voltage.Operational amplifier（U2）According to above-mentioned 2 He of pin
After the voltage of pin 3 amplifies, by operational amplifier（U2）1 output voltage of pin be sent to DC-DC module（101）Feedback
End（FB）, to control DC-DC module（101）The size of output voltage, equally also changes battery（102）Charging current,
To make photovoltaic battery panel（100）Output voltage stabilization in preset value.Preset value can be by changing resistance R1, R2 and resistance
The intrinsic standoff ratio of R3, R4 adjusts, and is arranged in photovoltaic battery panel（100）Near 0.78 times of open-circuit voltage.
If photovoltaic battery panel（100）Because shining upon enhancing so that output voltage has raised trend, through resistance R1, R2 points
Obtained sampled voltage is pressed also to increase, due to being that inverting input terminal voltage rises, operational amplifier（U2）It is exported after amplification
Pressure drop is low, DC-DC module（101）By feedback end（FB）The control of voltage decline, output voltage can increase, at this point, battery
Charging current also increases with it, and makes photovoltaic battery panel（100）Output voltage rapidly drop to preset value.If photovoltaic battery panel
（100）Because shining upon decrease so that output voltage has the tendency that reduction, the sampled voltage divided through resistance R1, R2 also drops
It is low, due to being the reduction of inverting input terminal voltage, operational amplifier（U2）Output pressure increases after amplification, DC-DC module（101）
By feedback end（FB）The raised control of voltage, output voltage can reduce, at this point, the charging current of battery also reduces therewith, make
Photovoltaic battery panel（100）Output voltage be climbed to preset value, realize photovoltaic battery panel（100）Always work in maximum
The purpose of power points.
Diode（D1）As temperature-compensating, when the temperature varies, operational amplifier can be changed automatically（U2）3
The reference voltage of pin.When temperature increases, reference voltage is reduced, and makes photovoltaic battery panel（100）Output voltage preset value reduce；
When temperature reduces, reference voltage is increased, and makes photovoltaic battery panel（100）Output voltage preset value increase.Photovoltaic cell can be overcome
Plate（100）The problem of being affected by temperature maximum power point voltage variation.The size of temperature-compensating can be by changing resistance R1, R2 points
Pressure ratio is adjusted.
Work as photovoltaic battery panel（100 when not generating electricity, LDO voltage stabilizer（U1）, operational amplifier（U2）, DC-DC module（101）
It does not work, not battery consumption（102）Electric energy.
Claims (7)
1. a kind of solar charging electric control circuit with MPPT function, by photovoltaic battery panel（100）, DC-DC module（101）,
Battery（102）, LDO voltage stabilizer（U1）, operational amplifier（U2）And diode（D1）, capacitor（C1）, resistance R1~R4 group
At, it is characterized in that：
1）Photovoltaic battery panel（100）Anode（V1+）With DC-DC module（101）Input terminal（Vin-1）, LDO voltage stabilizer（U1）It is defeated
Enter end（Vin-2）It is connected；
2）Operational amplifier（U2）Pin 3, pin 8 and LDO voltage stabilizer（U1）Output end（Vout-2）It is connected；
3）Operational amplifier（U2）Pin 1 and DC-DC module（101）Feedback end（FB）It is connected；
4）Battery（102）Anode（V2+）With DC-DC module output end（Vout-1）It is connected；
5）Photovoltaic battery panel（100）Cathode（V1-）, DC-DC module（101）Ground terminal（GND-1）, battery（102）Cathode
（V2-）, LDO voltage stabilizer（U1）Ground terminal（GND-2）, operational amplifier（U2）Pin 4 be grounded.
2. a kind of solar charging electric control circuit with MPPT function according to claim 1, it is characterized in that the light
Lie prostrate solar panel（100）, anode（V1+）It is grounded after also connecting with resistance R1, R2.
3. a kind of solar charging electric control circuit with MPPT function according to claim 1, it is characterized in that the DC-
DC module（101）, using boost module or voltage reduction module.
4. a kind of solar charging electric control circuit with MPPT function according to claim 1, it is characterized in that the fortune
Calculate amplifier（U2）, the line between pin 2 and series resistance R1, R2 is connected.
5. a kind of solar charging electric control circuit with MPPT function according to claim 1, it is characterized in that described
Operational amplifier（U2）, pin 3 and LDO voltage stabilizer（U1）Output end（Vout-2）When being connected, bypass is also in series with resistance
R3。
6. a kind of solar charging electric control circuit with MPPT function according to claim 1, it is characterized in that described
LDO voltage stabilizer（U1）Output end（Vout-2）, also it is serially connected with capacitor（C1）, while capacitor（C1）The other end ground connection.
7. a kind of solar charging electric control circuit with MPPT function according to claim 1, it is characterized in that described
Operational amplifier（U2）, pin 3 has been sequentially connected in series diode（D1）With resistance R4, while the one end resistance R4 and diode（D1）
Cathode is connected, other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811114189.1A CN108899987B (en) | 2018-09-25 | 2018-09-25 | Solar charging control circuit with MPPT function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811114189.1A CN108899987B (en) | 2018-09-25 | 2018-09-25 | Solar charging control circuit with MPPT function |
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| CN108899987A true CN108899987A (en) | 2018-11-27 |
| CN108899987B CN108899987B (en) | 2023-04-25 |
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Cited By (3)
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| CN109491446A (en) * | 2018-12-28 | 2019-03-19 | 上海南麟电子股份有限公司 | Constant voltage tracks circuit, photovoltaic cell system and its constant voltage tracking |
| CN112332517A (en) * | 2020-10-16 | 2021-02-05 | 许继电源有限公司 | Photovoltaic charging MPPT control circuit |
| CN114356021A (en) * | 2021-12-22 | 2022-04-15 | 中国电子科技集团公司第十八研究所 | MPPT series regulator bypass device |
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| CN109491446A (en) * | 2018-12-28 | 2019-03-19 | 上海南麟电子股份有限公司 | Constant voltage tracks circuit, photovoltaic cell system and its constant voltage tracking |
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| CN114356021A (en) * | 2021-12-22 | 2022-04-15 | 中国电子科技集团公司第十八研究所 | MPPT series regulator bypass device |
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| CN108899987B (en) | 2023-04-25 |
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