CN204304782U - The total current section BOOST circuit of a kind of photovoltaic MPPT - Google Patents
The total current section BOOST circuit of a kind of photovoltaic MPPT Download PDFInfo
- Publication number
- CN204304782U CN204304782U CN201420858317.4U CN201420858317U CN204304782U CN 204304782 U CN204304782 U CN 204304782U CN 201420858317 U CN201420858317 U CN 201420858317U CN 204304782 U CN204304782 U CN 204304782U
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- Prior art keywords
- boost circuit
- total current
- current section
- dsp
- capacitor
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- 239000003990 capacitor Substances 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009514 concussion Effects 0.000 description 1
Classifications
-
- 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 purpose of this utility model is the total current section BOOST circuit providing a kind of photovoltaic MPPT, by inductance L, HF switch pipe Q, diode D and capacitor C forms basic BOOST circuit, described inductance L, diode D and capacitor C is serially connected in photovoltaic cell the two poles of the earth successively, the drain electrode of described HF switch pipe Q connects the anode of diode D, grid receives the total current section control signal from DSP, capacitor C described in source electrode connects, wherein said DSP is by the input voltage of the basic BOOST circuit of sampling, output voltage and input current carry out computing to determine its operating state, to export total current section control signal.
Description
Technical field
The utility model relates to one and is applicable to the total current section BOOST circuit that maximum photovoltaic power point follows the tracks of (MPPT), belongs to photovoltaic BOOST control field.
Background technology
A lot of photovoltaic machine intimate is all with BOOST booster circuit, and play and direct voltage is elevated to required voltage effect, wide model is for the bus that boosts.BOOST circuit in the course of the work, generally runs under DCM mode of operation and CCM mode of operation, and according to different power grades and demand, the mode of operation to BOOST sets.For in powerful BOOST circuit, then wish that BOOST circuit can in the work of total current section, but BOOST circuit is under the service conditions that current ratio is lower, BOOST circuit can work in dcm mode, impact due to current sample precision can cause the low duty ratio of BOOST circuit normally to open, machine can shake, thus affects the normal operation of machine.Now conventional BOOST control system mostly is total current section and adopts outer voltage to add the duty ratio of current inner loop to BOOST to control, do not carry out when low current works controlling or eliminating concussion by increasing additional circuit, so not only circuit is complicated, cost is higher, and stability also can be deteriorated.
Utility model content
The purpose of this utility model is to provide a kind of total current section BOOST circuit control mode being applicable to photovoltaic MPPT, comprises circuit and control method thereof.The utility model, when the switching tube duty ratio of control BOOST, is achieved by the judgement of DSP and controls respectively the total current section of BOOST circuit, has circuit simple, system stability, the lower-cost advantage of the components and parts used.
Technical solutions of the utility model: the total current section BOOST circuit of a kind of photovoltaic MPPT, by inductance L, HF switch pipe Q, diode D and capacitor C forms basic BOOST circuit, described inductance L, diode D and capacitor C is serially connected in photovoltaic cell the two poles of the earth successively, the drain electrode of described HF switch pipe Q connects the anode of diode D, grid receives the total current section control signal from DSP, capacitor C described in source electrode connects, wherein said DSP is by the input voltage of the basic BOOST circuit of sampling, output voltage and input current carry out computing to determine its operating state, to export total current section control signal.
In one embodiment, described DSP is configured to: if judge, basic BOOST circuit is in DCM state, and computed duty cycle is to carry out opened loop control; If judge, basic BOOST circuit is in CCM state, then carry out closed-loop control.
In one embodiment, described DSP judges the operating state of basic BOOST circuit, controls its HF switch pipe Q and carries out corresponding PWM drive singal to carry out the control of total current section.
In another embodiment, the BOOST circuit total current section control method of a kind of photovoltaic MPPT, in described total current section BOOST circuit, comprising: by the input voltage V of DSP by described basic BOOST circuit
in, output voltage V
owith input current I
insample laggard row operation, judge the operating state of described basic BOOST circuit, be in DCM operating state if be judged as, then computed duty cycle is to carry out opened loop control; Be in CCM operating state if be judged as, then carry out closed-loop control; The HF switch pipe Q controlling described basic BOOST circuit carries out corresponding PWM drive singal to carry out the control of total current section.Wherein:
To the input voltage V of described basic BOOST circuit
inwith output voltage V
osample, according to inductance L inductance value, switching frequency, input voltage V
inwith output voltage V
ocalculate the critical point electric current I of described basic BOOST circuit under DCM and CCM two operating states
c;
To described basic BOOST circuit input current I
incarry out sampling and judging, if I
in>I
c, then judge that this basic BOOST circuit working is in CCM state; Otherwise, if I
in<I
c, then judge that this basic BOOST circuit BOOST is operated in DCM state.
Wherein, judge that basic BOOST circuit working is under CCM state, then provide reference voltage V by MPPT control ring at described DSP
ref; By described reference voltage V
refwith output voltage V
ocarry out outer voltage to control to obtain electric current loop reference current I
ref; By reference current I
refwith output current I
ocarry out current inner loop control; And obtain the PWM drive singal of HF switch pipe Q of described basic BOOST circuit through PI ring, transfer function and PWM control ring, to carry out double-closed-loop control.
Further, judge that basic BOOST circuit working is under DCM state at described DSP, then by DSP to input voltage V
in, output voltage V
o, electric current loop reference current I
ref, switching frequency and inductance L inductance value carry out calculating open loop duty ratio benchmark D
oP; By this open loop duty ratio benchmark D
oPobtain the PWM drive singal of the HF switch pipe Q of described basic BOOST circuit through transfer function and PWM control ring, realize opened loop control.
Compared with prior art, the utility model, when control BOOST switching tube duty ratio, is achieved by the judgement of DSP and controls respectively the total current section of BOOST circuit, has circuit simple, system stability, the lower-cost advantage of the components and parts used.
Accompanying drawing explanation
Fig. 1 is circuit theory schematic diagram of the present utility model;
Fig. 2 is that the open/close of the utility model circuit controls schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described, but not as the foundation limited the utility model.
As shown in Figure 1, basic BOOST circuit is by an inductance L, a HF switch pipe Q, a diode D, and a capacitor C forms.When basic BOOST circuit working, to input voltage V
inwith output voltage V
odSP (not showing in figure) is sent into, by DSP according to inductance L inductance value, switching frequency, input voltage V after sampling
inwith output voltage V
ocalculate the critical point electric current I of basic BOOST circuit under DCM and CCM two operating states
c.Meanwhile, DSP is to input current I
insample, its sampled value is judged.If I
in>I
c, then judge that BOOST is operated in CCM state.Otherwise, I
in<I
c, then judge that basic BOOST circuit working is in DCM state.
As shown in Figure 2, when DSP judges that basic BOOST circuit working is under CCM state, then reference voltage V is provided by MPPT control ring
ref, then by reference voltage V
refwith output voltage V
ocarry out outer voltage to control to obtain electric current loop reference current I
ref, then by reference current I
refwith output current I
ocarry out current inner loop control, obtain the PWM drive singal of the HF switch pipe Q of basic BOOST circuit finally by PI ring, transfer function and PWM control ring, realize double-closed-loop control.
Judge that BOOST circuit working is under DCM state at DSP, then by DSP to input voltage V
in, output voltage V
o, electric current loop reference current I
ref, switching frequency and inductance L inductance value carry out calculating open loop duty ratio benchmark D
oP, by this benchmark D
oPobtain the PWM drive singal of BOOST switching tube through transfer function and PWM control ring, realize opened loop control.
Claims (1)
1. the total current section BOOST circuit of a photovoltaic MPPT, it is characterized in that: by inductance L, HF switch pipe Q, diode D and capacitor C forms basic BOOST circuit, described inductance L, diode D and capacitor C is serially connected in photovoltaic cell the two poles of the earth successively, the drain electrode of described HF switch pipe Q connects the anode of diode D, grid receives the total current section control signal from DSP, capacitor C described in source electrode connects, wherein said DSP is by the input voltage of the basic BOOST circuit of sampling, output voltage and input current carry out computing to determine its operating state, to export total current section control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420858317.4U CN204304782U (en) | 2014-12-30 | 2014-12-30 | The total current section BOOST circuit of a kind of photovoltaic MPPT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420858317.4U CN204304782U (en) | 2014-12-30 | 2014-12-30 | The total current section BOOST circuit of a kind of photovoltaic MPPT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204304782U true CN204304782U (en) | 2015-04-29 |
Family
ID=53110289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420858317.4U Active CN204304782U (en) | 2014-12-30 | 2014-12-30 | The total current section BOOST circuit of a kind of photovoltaic MPPT |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204304782U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578784A (en) * | 2014-12-30 | 2015-04-29 | 浙江艾罗电源有限公司 | Full current section BOOST circuit of photovoltaic MPPT (maximum power point tracking) and full current section control method of full current section BOOST circuit |
| US9991715B1 (en) | 2017-03-09 | 2018-06-05 | Industrial Technology Research Institute | Maximum power point tracking method and apparatus |
| TWI632445B (en) * | 2017-03-09 | 2018-08-11 | 財團法人工業技術研究院 | Maximum power point tracking method and apparatus |
-
2014
- 2014-12-30 CN CN201420858317.4U patent/CN204304782U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578784A (en) * | 2014-12-30 | 2015-04-29 | 浙江艾罗电源有限公司 | Full current section BOOST circuit of photovoltaic MPPT (maximum power point tracking) and full current section control method of full current section BOOST circuit |
| CN104578784B (en) * | 2014-12-30 | 2017-07-07 | 浙江艾罗电源有限公司 | The total current section BOOST circuits and its total current section control method of a kind of photovoltaic MPPT |
| US9991715B1 (en) | 2017-03-09 | 2018-06-05 | Industrial Technology Research Institute | Maximum power point tracking method and apparatus |
| TWI632445B (en) * | 2017-03-09 | 2018-08-11 | 財團法人工業技術研究院 | Maximum power point tracking method and apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Tonglu Economic Development Zone, Hangzhou city of Zhejiang Province, Shi Chu Road 311500 No. 288 Patentee after: Zhejiang elong network energy technology Co. Ltd Address before: Tonglu Economic Development Zone, Hangzhou city of Zhejiang Province, Shi Chu Road 311500 No. 288 Patentee before: SOLAX POWER CO., LTD. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 311500 No. 288 Shizhu Road, Tonglu Economic Development Zone, Hangzhou City, Zhejiang Province Patentee after: Zhejiang arrow network energy technology Co.,Ltd. Address before: 311500 No. 288 Shizhu Road, Tonglu Economic Development Zone, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG SOLAX NETWORK ENERGY TECHNOLOGY Co.,Ltd. |