CN101262136A - Solar charging and discharging control device and its control method - Google Patents
Solar charging and discharging control device and its control method Download PDFInfo
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- CN101262136A CN101262136A CNA2008100473809A CN200810047380A CN101262136A CN 101262136 A CN101262136 A CN 101262136A CN A2008100473809 A CNA2008100473809 A CN A2008100473809A CN 200810047380 A CN200810047380 A CN 200810047380A CN 101262136 A CN101262136 A CN 101262136A
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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 relates to a solar energy charging and discharging control device and a control method thereof. The device comprises three field effect transistors controlling the operation of solar batteries and a battery and a control circuit controlling the field effect transistors and is characterized in that: the anode of the solar batteries and the cathode of the battery are connected to prevent reverse charging field effect transistors from being connected in series with charging field effect transistors by drains. The control method is as follows: an MCU samples terminal voltage of the battery, charging current, discharging current and surrounding temperature and a basic carrying capacity is obtained from the relationship between the terminal voltage of the battery and the charged status thereof; on the basis of the basic carrying capacity, basic carrying capacity is corrected for a second time and the depth of discharge of the battery is controlled according to the data. The solar energy charging and discharging control device and the control method thereof control the discharging control circuit of the battery with the charged status of the battery through calculating the charged status SOC of the battery and prevent the battery from damage caused by over discharge, thereby greatly prolonging the service life of the battery.
Description
Technical field
The invention belongs to a kind of solar cell control device and control method, particularly a kind of solar charging and discharging control device and control method.
Background technology
In existing solar charging/discharging controller, low-end product can only be finished with hardware circuit, but most of controller adopts Single-chip Controlling.In monolithic processor controlled solar charging/discharging controller, more just carry out inner control with single-chip microcomputer, cross the control of putting about storage battery, should go because the measurement of its voltage is convenient, obtained using widely.Yet this simple voltage control method, when the charging and discharging of accumulator electric current changed greatly, at its protection point place, the actual SOC of storage battery may differ greatly, or can not make full use of storage battery, or storage battery is had very big injury.The SOC that wants accurate calculating accumulator at present also has certain degree of difficulty.
Summary of the invention
The purpose of this invention is to provide a kind of state-of-charge SOC (being carrying capacity again) by calculating accumulator, utilize the state-of-charge of storage battery to control the solar charging and discharging control device and the control method of the charge/discharge control circuit of storage battery, to overcome above-mentioned deficiency.
To achieve these goals, the present invention is by the control solar module, three field effect transistor that storage battery (group) moves and the control circuit of controlling field effect transistor constitute, be characterized in: the positive pole of solar module links to each other with battery positive voltage, the negative pole of solar module joins with the source electrode of charging control field effect transistor T1, the drain electrode of charging control field effect transistor T1 is connected with the drain electrode that control field effect transistor T2 is filled in counnter attack, the source electrode of control field effect transistor T2 is filled in counnter attack and the source electrode of discharge control field effect transistor T3 links to each other with the negative pole of storage battery, the grid of three field effect transistor is connected with control circuit respectively, and the drain electrode of battery positive voltage and discharge control field effect transistor T3 is connected load as the loading interfaces of controller.
Also be provided with temperature sensor and button on the above-mentioned storage battery.
The control method of above-mentioned control circuit is:
Terminal voltage, charging and discharging currents and the ambient temperature on every side of single-chip microcomputer sampling storage battery in the control circuit; utilize the terminal voltage of storage battery and the relation of its state-of-charge; obtain a basic carrying capacity; on the basis of this basic carrying capacity; according to the charging and discharging currents curve; carry out the once correction of basic carrying capacity; then; again according to the influence of ambient temperature to storage battery; call experiment gained empirical parameter stored in the single-chip microcomputer and carry out the secondary correction; control the depth of discharge of storage battery according to these data, the storage battery that adequately protects is not subjected to the damage of overdischarge.
The detailed process of above-mentioned control method is:
The first step: the single-chip microcomputer electrification reset, carry out system initialization.This step is that the resource of single-chip microcomputer is distributed, and makes single-chip microcomputer be fit to the application of this controller; Simultaneously to the necessary parameter initialize.
Second step: storage battery is carried out continuous sampling, carry out the identification that battery 12V still is 24V.After having discerned,, call relevant parameters with respect to the 12V/24V system.
The 3rd step: initialization temperature sensor.
The 4th step: show.Send liquid crystal display screen to show by current state every video data of system.
The 5th step: keyboard scan.See to have or not key to press, have key to press, carry out operation accordingly.
The 6th step: according to ambient temperature and cell voltage and corresponding setup parameter the charge calculating and the execution of control.
The 7th the step: according to battery status, discharging current and corresponding setup parameter discharge control calculating and execution.
The 8th step: the 4th above the circulation went on foot for the 7th step.
Above-mentioned control circuit also must regularly carry out following processing when finishing control method:
1, to discharging current sample, filtering, judge whether short circuit, overload simultaneously, discharge capacity is carried out accumulation calculating.
2, to charging current sample, filtering, charge volume is carried out accumulation calculating.
3, to cell voltage sample, filtering, the counting cell capacity.The battery charging and discharging protection is calculated.
4, temperature is gathered.
The state-of-charge SOC of the present invention by calculating accumulator utilizes the state-of-charge of storage battery to control the charge/discharge control circuit of storage battery, and the storage battery that adequately protects is not subjected to the damage of overdischarge, the useful life of having improved storage battery greatly.The present invention has also adopted friendly human-computer interaction interface, and for the running status of controller, the user not only can check very easily, and can also be at any time to its setting of being correlated with.At present solar energy photovoltaic system much is 12V or 24V, and the present invention also has the automatic recognition function of 12V, 24V.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention.
Fig. 2 is a main program flow chart of the present invention.
Fig. 3 is an interrupt routine flow chart of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
The positive pole of the positive pole of solar module of the present invention, the positive pole of storage battery and load connects together; The negative pole of solar module is connected in the source electrode of field effect transistor (group) T1 of charging control; The drain electrode of the field effect transistor (group) of charging control and the drain electrode of field effect transistor (group) T2 that control is filled in counnter attack connect together; The source electrode that field effect transistor (group) T2 of control is filled in counnter attack is connected in the negative pole of storage battery; The source electrode of field effect transistor (group) T3 of discharge control is connected in the negative pole of storage battery; The drain electrode of field effect transistor (group) T3 of discharge control is connected in the negative pole of load.The grid of three field effect transistor (group) is linked control circuit respectively, also is provided with temperature sensor (Fig. 1) on the storage battery, is provided with display screen and button in the control circuit.
The positive pole of three parts of the present invention (solar module, storage battery and load) connects together, and control circuit is on negative pole; With two (group) field effect transistor strings together; flowing of the both direction of Control current; control each field effect transistor or field effect transistor group (for the bigger available a plurality of field effect transistor of electric current and be unified into the field effect transistor group) by control circuit, finish the protection of charging control, discharge control and the anti-reverse charge of battery.
The state-of-charge of lead acid accumulator is relevant with the physical-chemical parameters such as the terminal voltage of battery, charging and discharging currents, ambient temperatures, and these parameters all are again non-linear to the influence of storage battery, wants to describe with a complete formula, also is difficult at present accomplish.The present invention comprehensively examines above each condition of filter, utilizes single-chip microcomputer (microcontroller) to finish this non linear system.Concrete grammar is: terminal voltage, charging and discharging currents and the ambient temperature on every side of single-chip microcomputer sampling storage battery, utilize the terminal voltage of storage battery and the relation of its state-of-charge, and obtain a basic carrying capacity; On the basis of this basic carrying capacity,, carry out the once correction of basic carrying capacity according to the charging and discharging currents curve; Then, again according to the influence of ambient temperature, utilize experiment gained empirical parameter to carry out secondary and proofread and correct storage battery.These can obtain having the storage battery state-of-charge of practical value.Control the depth of discharge of storage battery according to these data, the storage battery that can adequately protect is not subjected to the damage of overdischarge, the useful life of having improved storage battery greatly.
Program in the control circuit of the present invention comprises: making, the 12V/24V identification automatically just of electrification reset, system, keyboard scan, liquid crystal display, charging control, discharge control, battery voltage sampling, charging current sampling, discharging current sampling, temperature survey, battery electric quantity calculate, accumulative total is charged, and the ampere-hour number calculates, accumulated discharge ampere-hour number calculates (Fig. 2 and Fig. 3).
The content that is not described in detail in this specification belongs to this area professional and technical personnel's known prior art.
Claims (6)
1, a kind of solar charging and discharging control device, by the control solar module, three field effect transistor that storage battery (group) moves and the control circuit of controlling field effect transistor constitute, it is characterized in that: the positive pole of solar module links to each other with battery positive voltage, the negative pole of solar module joins with the source electrode of charging control field effect transistor (T1), the drain electrode of charging control field effect transistor (T1) is connected with the drain electrode that control field effect transistor (T2) is filled in counnter attack, the source electrode of control field effect transistor (T2) is filled in counnter attack and the source electrode of discharge control field effect transistor (T3) links to each other with the negative pole of storage battery, the grid of three field effect transistor is connected with control circuit respectively, and the drain electrode of battery positive voltage and discharge control field effect transistor (T3) is connected load as the output of controller.
2, solar charging and discharging control device as claimed in claim 1 is characterized in that: also be provided with temperature sensor on the storage battery.
3, solar charging and discharging control device as claimed in claim 1 is characterized in that: be provided with display screen and button in the control circuit.
4; as claim 1 or 2 or 3 described solar charging and discharging control devices; it is characterized in that: the control method of control circuit is: the terminal voltage of single-chip microcomputer sampling storage battery in the control circuit; charging and discharging currents and ambient temperature on every side; utilize the terminal voltage of storage battery and the relation of its state-of-charge; obtain a basic carrying capacity; on the basis of this basic carrying capacity; according to the charging and discharging currents curve; carry out the once correction of basic carrying capacity; then; again according to the influence of ambient temperature to storage battery; call experiment gained empirical parameter stored in the single-chip microcomputer and carry out the secondary correction; control the depth of discharge of storage battery according to these data, the storage battery that adequately protects is not subjected to the damage of overdischarge.
5, solar charging/discharging control method as claimed in claim 4, it is characterized in that: the detailed process of control method is:
The first step: the single-chip microcomputer electrification reset, carry out system initialization;
Second step: storage battery is carried out continuous sampling, carry out the identification that battery 12V still is 24V;
The 3rd step: initialization temperature sensor;
The 4th step: show: send display screen to show by current state every video data of system;
The 5th step: keyboard scan: see to have or not key to press, have key to press, carry out operation accordingly;
The 6th step: according to ambient temperature and cell voltage and corresponding setup parameter the charge calculating and the execution of control;
The 7th the step: according to battery status, discharging current and corresponding setup parameter discharge control calculating and execution;
The 8th step: the 4th step above the circulation is to the 7th step.
6, solar charging/discharging control method as claimed in claim 5 is characterized in that: control circuit also must regularly carry out following processing when finishing control method:
A, to discharging current sample, filtering, judge whether short circuit, overload simultaneously, discharge capacity is carried out accumulation calculating;
B, to charging current sample, filtering, charge volume is carried out accumulation calculating;
C, to cell voltage sample, filtering, the protection of counting cell capacity, battery charging and discharging is calculated.
D, temperature is gathered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100473809A CN101262136A (en) | 2008-04-17 | 2008-04-17 | Solar charging and discharging control device and its control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100473809A CN101262136A (en) | 2008-04-17 | 2008-04-17 | Solar charging and discharging control device and its control method |
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| CNA2008100473809A Pending CN101262136A (en) | 2008-04-17 | 2008-04-17 | Solar charging and discharging control device and its control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102555830A (en) * | 2010-12-29 | 2012-07-11 | 上海汽车集团股份有限公司 | Automobile power supply system based on double energy storage units and automobile power supply control method |
| CN102624066A (en) * | 2012-04-27 | 2012-08-01 | 英利能源（中国）有限公司 | Off-grid layered equalization charging system of photovoltaic battery |
| CN110133517A (en) * | 2019-05-06 | 2019-08-16 | 河海大学 | A kind of battery charge state estimating apparatus based on Kalman filtering algorithm |
-
2008
- 2008-04-17 CN CNA2008100473809A patent/CN101262136A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102555830A (en) * | 2010-12-29 | 2012-07-11 | 上海汽车集团股份有限公司 | Automobile power supply system based on double energy storage units and automobile power supply control method |
| CN102555830B (en) * | 2010-12-29 | 2014-12-17 | 上海汽车集团股份有限公司 | Automobile power supply system based on double energy storage units and automobile power supply control method |
| CN102624066A (en) * | 2012-04-27 | 2012-08-01 | 英利能源（中国）有限公司 | Off-grid layered equalization charging system of photovoltaic battery |
| CN102624066B (en) * | 2012-04-27 | 2014-03-19 | 英利能源（中国）有限公司 | Off-grid layered equalization charging system of photovoltaic battery |
| CN110133517A (en) * | 2019-05-06 | 2019-08-16 | 河海大学 | A kind of battery charge state estimating apparatus based on Kalman filtering algorithm |
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Open date: 20080910 |