CN204190688U - DC/DC translation circuit in a kind of solar photovoltaic generation system - Google Patents
DC/DC translation circuit in a kind of solar photovoltaic generation system Download PDFInfo
- Publication number
- CN204190688U CN204190688U CN201420569132.1U CN201420569132U CN204190688U CN 204190688 U CN204190688 U CN 204190688U CN 201420569132 U CN201420569132 U CN 201420569132U CN 204190688 U CN204190688 U CN 204190688U
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- Prior art keywords
- power switch
- switch pipe
- circuit
- diode
- solar cell
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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 output voltage of the solar cell in the small-sized solar photovoltaic generating system involved by the utility model 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 described in the utility model 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.
Description
Technical field
The utility model 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
The technical problem that the utility model solves: 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 utility model 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 the small-sized solar photovoltaic generating system involved by the utility model 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 described in the utility model 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 utility model, described power switch pipe one and power switch pipe two are MOSFET pipe.
The utility model gives the BUCK circuit of the improvement of applying in solar photovoltaic generation system, can carry out MPPT maximum power point tracking and effectively reduce power consumption in circuit with the type circuit, and solar cell efficiency is increased.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model 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 utility model.
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 utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
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 |
|---|---|---|---|
| CN201420569132.1U CN204190688U (en) | 2014-09-29 | 2014-09-29 | DC/DC translation circuit in a kind of solar photovoltaic generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420569132.1U CN204190688U (en) | 2014-09-29 | 2014-09-29 | DC/DC translation circuit in a kind of solar photovoltaic generation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204190688U true CN204190688U (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420569132.1U Expired - Fee Related CN204190688U (en) | 2014-09-29 | 2014-09-29 | DC/DC translation circuit in a kind of solar photovoltaic generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204190688U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270085A (en) * | 2014-09-29 | 2015-01-07 | 苏州克兰兹电子科技有限公司 | DC/DC conversion circuit in solar photovoltaic power generation system |
-
2014
- 2014-09-29 CN CN201420569132.1U patent/CN204190688U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270085A (en) * | 2014-09-29 | 2015-01-07 | 苏州克兰兹电子科技有限公司 | DC/DC conversion circuit in solar photovoltaic power generation system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20150929 |
|
| EXPY | Termination of patent right or utility model |