CN104270085A - DC/DC conversion circuit in solar photovoltaic power generation system - Google Patents
DC/DC conversion circuit in solar photovoltaic power generation system Download PDFInfo
- Publication number
- CN104270085A CN104270085A CN201410512721.0A CN201410512721A CN104270085A CN 104270085 A CN104270085 A CN 104270085A CN 201410512721 A CN201410512721 A CN 201410512721A CN 104270085 A CN104270085 A CN 104270085A
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- Prior art keywords
- power switch
- circuit
- switch pipe
- diode
- solar cell
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- 238000006243 chemical reaction Methods 0.000 title abstract description 5
- 238000010248 power generation Methods 0.000 title abstract 2
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 3
- 210000004027 cell Anatomy 0.000 abstract 2
- 210000000352 storage cell Anatomy 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000003292 diminished effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
-
- 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
- H02J7/007—Regulation of charging or discharging current or voltage
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a solar cell in a small solar photovoltaic power generation system. Output voltage of the solar cell is larger than charging voltage of a storage cell. Moreover, for further improving the conversion efficiency of the system, a voltage reduction circuit of a BUCK circuit is mainly used as a charge control circuit, and some improvements are made. In comparison with the BUCK circuit, a second power switch tube is additionally arranged in a DC/DC conversion circuit; moreover, the state of the second power switch tube and the state of a first power switch tube are always opposite, namely, the first power switch tube is connected while the second power switch tube is cut off, and the first power switch tube is cut off while the second power switch tube is connected. Due to the design, the advantage of reducing the power consumption in the circuit is achieved.
Description
Technical field
The present invention relates to solar energy generation technology field, in particular to the DC/DC translation circuit in a kind of solar photovoltaic generation system.
Background technology
Because the voltage of solar cell generation and the voltage of battery-operated are all direct voltages in solar photovoltaic generation system, so need DC/DC voltage conversion circuit.
The DC/DC translation circuit often used in solar photovoltaic generation system mainly contains BUCK circuit, BOOST circuit, BUCK-BOOST circuit and cuk converter.Wherein BUCK circuit output voltage and input voltage ratio are less than 1 for reduction voltage circuit, and BOOST circuit output voltage and input voltage ratio are greater than 1 for booster circuit.
BUCK circuit input end is operated in on-off state, if directly being connect by BUCK circuit to cause solar cell output current discontinuous on the solar cell, solar cell can not be operated in maximum power point, therefore need at solar cell output storage capacitor in parallel to ensure the continuous of solar battery array output current, this storage capacitor mostly is electrochemical capacitor.When switching tube conducting, solar cell charges to storage battery; When switching tube disconnects, solar cell charges to storage capacitor, ensures that solar cell is in generating state all the time.Due to switching tube conducting repeatedly and cut-off, two states constantly switches, and direct voltage is converted into the voltage of impulse form, then through L, C filtering, forms direct voltage output.By regulating the duty ratio D of BUCK contactor pipe PWM to realize regulating solar cell to export the object of average power, thus realize the MPPT function to solar cell.As shown in Figure 1, in Fig. 1,10 is solar cell to the BUCK circuit structure of typical connection solar cell, and Cin is storage capacitor, and Q is switching tube, and D is diode, and L is inductance, and C is electric capacity, and R is resistance, and 20 is storage battery.
The advantage of BUCK circuit realiration solar battery array MPPT maximum power point tracking is: structure is simple, and control easily to realize, the output current of switching tube is little, and the loss of circuit is little.The shortcoming of BUCK circuit is: must at a circuit input end storage capacitor in parallel, and in high-power situation, storage capacitor is in large current density electricity condition all the time, unfavorable to its reliably working; Simultaneously because storage capacitor is generally electrochemical capacitor, BUCK circuit cannot be worked at higher frequencies; And BUCK circuit can only be used for reduction voltage circuit.
BOOST circuit realizes the object of battery tension rising to battery discharging with inductive current source side formula.Compared with BUCK circuit, the inductance of BOOST circuit is at the input of circuit, as long as it is enough large therefore to input inductance, under the state that BOOST circuit can work in continuous input current all the time, the ripple current on inductance can be very little, almost close to level and smooth direct current, therefore in photovoltaic generating system application, BOOST circuit even can not add electric capacity by the less noninductive electric capacity of capacity in parallel at input, as shown in dotted line Cin in Fig. 2, so just can avoid adding all drawbacks that electric capacity brings.BOOST structure is also very simple simultaneously, and circuit breaker in middle pipe has one end to be ground connection, does not need to consider switching tube conduction voltage drop problem when designing PWM, and this will make the design of switching tube simpler.As shown in Figure 2, in Fig. 2,10 is solar cell to typical BOOST circuit, and Cin is storage capacitor, and Q is switching tube, and D is diode, and L is inductance, and C is electric capacity, and R is resistance, and 20 is storage battery.
The advantage of BOOST circuit compares simpler mutually with BUCK circuit.But the weak point of BOOST circuit is that its input terminal voltage is lower, with BUCK circuit under compared with same power, input current is comparatively large, and thus circuit loss is comparatively large, and BOOST circuit transformation efficiency is more lower slightly; And BOOST circuit can only carry out boosting inverter.
Summary of the invention
Technical problem solved by the invention: in BUCK circuit, during Q conducting, solar cell charges to storage battery, during Q cut-off, L, D, storage battery form loop, and circuit plays the effect of afterflow, and the electric current namely in L reduces gradually, at this moment the electric current in circuit all flows through D, and this will form larger power consumption; BOOST circuit input terminal voltage lower, with BUCK circuit under compared with same power, input current is comparatively large, and thus circuit loss is larger.
The invention provides following technical scheme: the DC/DC translation circuit in a kind of solar photovoltaic generation system, comprise solar cell, storage capacitor, electric capacity, power switch pipe one, diode one, diode two, inductance, resistance, storage battery, described diode one is connected in series with solar cell positive pole, described storage capacitor is in parallel with solar cell, described power switch pipe one is connected in series with diode two, power switch pipe one and the diode two of described serial connection are in parallel with storage capacitor, described resistance is in parallel with storage battery, described electric capacity is in parallel with a resistor, described inductance one end is connected with electric capacity, the described inductance other end is connected with power switch one.Described DC/DC translation circuit also comprises power switch pipe two, and described power switch pipe two is in parallel with diode two, and described power switch pipe two is contrary all the time with the state of power switch pipe one.
The output voltage of the solar cell in small-sized solar photovoltaic generating system involved in the present invention is greater than the charging voltage of storage battery, and be the conversion efficiency of further raising system, so charging control circuit is based on BUCK circuit reduction voltage circuit, and some improvement are carried out.Compared with BUCK circuit, DC/DC translation circuit of the present invention is a many power switch pipe two, and power switch pipe two is contrary all the time with the state of power switch pipe one, namely power switch pipe one conducting power switch pipe two ends, the conducting of power switch pipe one stop power switching tube two.The benefit of this design to reduce the consumption of power in circuit.When not adding power switch pipe two, during power switch pipe one conducting, solar cell charges to storage battery; When power switch pipe one ends, inductance, diode two, storage battery form loop, and circuit plays the effect of afterflow, and the electric current namely in inductance reduces gradually, and the electric current at this moment in circuit all flows through diode two, and this will form larger power consumption.After with the addition of power switch pipe two, when power switch pipe one ends, inductance, power switch pipe two, storage battery form loop, circuit still plays the effect of afterflow, but the electric current now in circuit is not all flow through diode two, most electric current now flows through power switch pipe two, and internal resistance during power switch pipe two conducting is minimum, and on whole circuit, the consumption of power has also just diminished like this.
As preferably of the present invention, described power switch pipe one and power switch pipe two are MOSFET pipe.
The present invention gives the BUCK circuit of the improvement of applying in solar photovoltaic generation system, can MPPT maximum power point tracking be carried out with the type circuit and effectively reduce power consumption in circuit, solar cell efficiency is increased.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described further:
Fig. 1 is BUCK circuit structure diagram of the prior art;
Fig. 2 is BOOST circuit structure diagram of the prior art;
Fig. 3 is the DC/DC translation circuit in a kind of solar photovoltaic generation system of the present invention.
Symbol description in figure:
10-solar cell;
20-storage battery;
Cin-storage capacitor; C-electric capacity;
D-diode; D1-diode; D2-diode;
L-inductance;
Q-switching tube; Q1-MOSFET manages; Q2-MOSFET manages;
R-resistance.
Embodiment
As shown in Figure 3, DC/DC translation circuit in a kind of solar photovoltaic generation system, comprise solar cell 10, storage capacitor Cin, electric capacity C, MOSFET pipe one Q1, diode one D1, diode two D2, inductance L, resistance R, storage battery 20, described diode one D1 is connected in series with solar cell 10 positive pole, described storage capacitor Cin is in parallel with solar cell 10, described MOSFET pipe one Q1 is connected in series with diode two D2, MOSFET pipe one Q1 and diode two D2 of described serial connection are in parallel with storage capacitor Cin, described resistance R is in parallel with storage battery 20, described electric capacity C is in parallel with resistance R, described inductance L one end is connected with electric capacity C, the described inductance L other end is connected with power switch one Q1, it is characterized in that: also comprise MOSFET pipe two Q2, described MOSFET pipe two Q2 is in parallel with diode two D2, the state of described MOSFET pipe two Q2 and MOSFET pipe one Q1 is contrary all the time.
In real work, the state of MOSFET pipe two Q2 and MOSFET pipe one Q1 is contrary all the time, and namely MOSFET pipe one Q1 conducting MOSFET pipe two Q2 ends, and MOSFET pipe one Q1 ends MOSFET pipe two Q2 conducting.When MOSFET pipe one Q1 ends, inductance L, MOSFET pipe two Q2, storage battery 20 form loop, circuit plays the effect of afterflow, but the electric current now in circuit is not all flow through diode two D2, most electric current now flows through MOSFET pipe two Q2, and internal resistance during MOSFET pipe two Q2 conducting is minimum, on whole circuit, the consumption of power has also just diminished like this.
Above content is only better embodiment of the present invention, and for those of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, this description should not be construed as limitation of the present invention.
Claims (2)
1. the DC/DC translation circuit in a solar photovoltaic generation system, comprise solar cell (10), storage capacitor (Cin), electric capacity (C), power switch pipe one (Q1), diode one (D1), diode two (D2), inductance (L), resistance (R), storage battery (20), described diode one (D1) is connected in series with solar cell (10) positive pole, described storage capacitor (Cin) is in parallel with solar cell (10), described power switch pipe one (Q1) is connected in series with diode two (D2), power switch pipe one (Q1) and the diode two (D2) of described serial connection are in parallel with storage capacitor (Cin), described resistance (R) is in parallel with storage battery (20), described electric capacity (C) is in parallel with resistance (R), described inductance (L) one end is connected with electric capacity (C), described inductance (L) other end is connected with power switch one (Q1), it is characterized in that: also comprise power switch pipe two (Q2), described power switch pipe two (Q2) is in parallel with diode two (D2), described power switch pipe two (Q2) is contrary all the time with the state of power switch pipe one (Q1).
2. the DC/DC translation circuit in a kind of solar photovoltaic generation system as claimed in claim 1, is characterized in that: described power switch pipe one (Q1) and power switch pipe two (Q2) are MOSFET pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410512721.0A CN104270085A (en) | 2014-09-29 | 2014-09-29 | DC/DC conversion circuit in solar photovoltaic power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410512721.0A CN104270085A (en) | 2014-09-29 | 2014-09-29 | DC/DC conversion circuit in solar photovoltaic power generation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104270085A true CN104270085A (en) | 2015-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410512721.0A Pending CN104270085A (en) | 2014-09-29 | 2014-09-29 | DC/DC conversion circuit in solar photovoltaic power generation system |
Country Status (1)
| Country | Link |
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| CN (1) | CN104270085A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883120A (en) * | 2015-01-12 | 2015-09-02 | 深圳硕日新能源科技有限公司 | MPPT photovoltaic charging control circuit capable of bidirectional charging |
| CN105429268A (en) * | 2015-12-01 | 2016-03-23 | 上海宇航系统工程研究所 | Redundant MPPT circuit structure-based micro-nano satellite power supply system |
| CN105634043A (en) * | 2014-11-01 | 2016-06-01 | 江苏绿扬电子仪器集团有限公司 | Photovoltaic intelligent charging control device |
| CN109863662A (en) * | 2016-10-27 | 2019-06-07 | 株式会社丰田中央研究所 | Power supply device and control method for power supply device |
| WO2022237318A1 (en) * | 2021-12-09 | 2022-11-17 | 深圳市德兰明海科技有限公司 | Power switch circuit and power switch |
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| JP2012065434A (en) * | 2010-09-15 | 2012-03-29 | Sumitomo Electric Ind Ltd | Dc power supply and power storage system |
| CN103529899A (en) * | 2013-10-17 | 2014-01-22 | 深圳市禾望电气有限公司 | MPPT controller, power tracking device, photovoltaic power generation and energy storage system |
| CN103532379A (en) * | 2013-09-09 | 2014-01-22 | 深圳市佳华利道新技术开发有限公司 | Bidirectional DC-DC converter and hybrid electric vehicle |
| CN204190688U (en) * | 2014-09-29 | 2015-03-04 | 苏州克兰兹电子科技有限公司 | DC/DC translation circuit in a kind of solar photovoltaic generation system |
-
2014
- 2014-09-29 CN CN201410512721.0A patent/CN104270085A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012065434A (en) * | 2010-09-15 | 2012-03-29 | Sumitomo Electric Ind Ltd | Dc power supply and power storage system |
| CN103532379A (en) * | 2013-09-09 | 2014-01-22 | 深圳市佳华利道新技术开发有限公司 | Bidirectional DC-DC converter and hybrid electric vehicle |
| CN103529899A (en) * | 2013-10-17 | 2014-01-22 | 深圳市禾望电气有限公司 | MPPT controller, power tracking device, photovoltaic power generation and energy storage system |
| CN204190688U (en) * | 2014-09-29 | 2015-03-04 | 苏州克兰兹电子科技有限公司 | DC/DC translation circuit in a kind of solar photovoltaic generation system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634043A (en) * | 2014-11-01 | 2016-06-01 | 江苏绿扬电子仪器集团有限公司 | Photovoltaic intelligent charging control device |
| CN104883120A (en) * | 2015-01-12 | 2015-09-02 | 深圳硕日新能源科技有限公司 | MPPT photovoltaic charging control circuit capable of bidirectional charging |
| CN104883120B (en) * | 2015-01-12 | 2016-06-08 | 深圳硕日新能源科技有限公司 | A kind of can the photovoltaic charged control circuit of MPPT of two-way charging |
| CN105429268A (en) * | 2015-12-01 | 2016-03-23 | 上海宇航系统工程研究所 | Redundant MPPT circuit structure-based micro-nano satellite power supply system |
| CN105429268B (en) * | 2015-12-01 | 2018-10-23 | 上海宇航系统工程研究所 | A kind of micro-nano satellite power-supply system based on redundancy MPPT circuit structures |
| CN109863662A (en) * | 2016-10-27 | 2019-06-07 | 株式会社丰田中央研究所 | Power supply device and control method for power supply device |
| CN109863662B (en) * | 2016-10-27 | 2023-03-24 | 株式会社丰田中央研究所 | Power supply device and control method for power supply device |
| WO2022237318A1 (en) * | 2021-12-09 | 2022-11-17 | 深圳市德兰明海科技有限公司 | Power switch circuit and power switch |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150107 |
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| RJ01 | Rejection of invention patent application after publication |