CN102751866A - High-gain DC (Direct Current)-DC boost converter applicable to photovoltaic generation system - Google Patents
High-gain DC (Direct Current)-DC boost converter applicable to photovoltaic generation system Download PDFInfo
- Publication number
- CN102751866A CN102751866A CN2012102259079A CN201210225907A CN102751866A CN 102751866 A CN102751866 A CN 102751866A CN 2012102259079 A CN2012102259079 A CN 2012102259079A CN 201210225907 A CN201210225907 A CN 201210225907A CN 102751866 A CN102751866 A CN 102751866A
- Authority
- CN
- China
- Prior art keywords
- gain
- main switch
- diode
- inductance
- boost converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a high-gain DC (Direct Current)-DC boost converter applicable to a photovoltaic generation system. The high-gain DC-DC boost converter comprises an input power source, a first main switch, a second main switch, a first inductor, a second inductor, a first diode, a second diode, a first capacitor, a second capacitor, a follow current diode and a filtering capacitor. Compared with the prior art, the high-gain DC-DC boost converter provided by the invention has the advantages that the high-voltage gain can be obtained and the voltage stress of the main switch is reduced. Furthermore, the high-gain DC-DC boost converter has the advantages of high efficiency, low cost and the like.
Description
Technical field
The present invention relates to a kind ofly convert low pressure the DC boost converter of high pressure into, especially relate to a kind of high-gain DC-DC boost converter that is applicable to photovoltaic generating system.
Background technology
The input source of photovoltaic generating system has the lower characteristic of voltage; Therefore before the electricity that photovoltaic array is sent transfers direct current to alternating current through the DC/AC inverter and is incorporated into the power networks; Also need lower direct voltage to be converted into higher direct voltage through the DC/DC boost converter; A higher direct current inlet highway voltage is provided on the one hand the DC/AC inverter, accomplishes maximum power point (MPPT) on the other hand and follow the tracks of.Therefore high efficiency, high-gain, DC/DC boost converter simple in structure become indispensable critical component.In order to obtain the higher voltage conversion gain, the method that adopts usually is in traditional DC/DC boost converter, to adopt bigger duty ratio, still because the influence of parasitic parameter can not reach very high input and output voltage ratio; Other method adopts modes such as transformer, coupling inductance and multistage connection exactly.Yet, need not isolate or volume requirement smaller applications occasion at those, boosting through these modes just is difficult to realize above requirement.In addition, the leakage inductance of transformer and coupling inductance causes that very easily switching voltage spike and EMI (Electromagnetic Interference, electromagnetic interference) etc. bring the problem of potential safety hazard to power supply itself and surrounding devices; Multistage connecting mode then brings problems such as control signal distortion, volume increase, back level switch tube voltage stress increase, circuit topological structure complicacy, conversion efficiency reduction and manufacturing cost rising.The topological structure of traditional voltage boosting dc transducer is as shown in Figure 1, and there is following shortcoming in it:
1) traditional voltage boosting dc transducer adopts bigger duty ratio usually in order to realize high-gain, main switch.So directly cause the ON time increase of main switch and the peak value of input current to increase, bring bigger switch conduction loss, directly reduced whole conversion efficiency.
2) in order to realize high-gain, transformer and coupling inductance with high turn ratio are used, and cause overall volume to increase and the increase of core design difficulty.
3) leakage inductance of transformer and coupling inductance and parasitic capacitance very easily cause the higher-order of oscillation to take place, and produce switching voltage spike and EMI.
4) for suppress spiking that various parasitic parameters produce and EMI, must the additional designs buffer circuit, cause number of devices to increase and the conversion efficiency reduction, and make design cycle complicated.
5) it is complicated that multistage connecting mode then directly causes main circuit and control circuit, reduced power density, increased design and manufacturing cost.
6) voltage stress of main switch must be selected the higher power device of voltage withstand class by the output voltage clamper, has improved hardware cost, has increased the main switch conduction impedance, has reduced conversion efficiency.
In view of above reason, that traditional voltage boosting dc transducer is difficult to reach is efficient, small-sized to the voltage boosting dc transducer in the photovoltaic generating system, low noise, requirement cheaply.
Summary of the invention
The object of the invention is exactly to provide a kind of in order to overcome the defective that above-mentioned prior art exists and obtain the high voltage conversion gain, reduce the voltage stress that is added in multistage main switch two ends, the high-gain DC-DC boost converter that is applicable to photovoltaic generating system that efficient is high, cost is low.
The object of the invention can be realized through following technical scheme:
A kind of high-gain DC-DC boost converter that is applicable to photovoltaic generating system; Comprise input power supply, first main switch, second main switch, first inductance, second inductance, first diode, second diode, first electric capacity, second electric capacity, fly-wheel diode and filter capacitor; The positive pole of described input power supply is connected with an end of first inductance, the anode of first diode and the anode of second diode respectively; The negative pole of input power supply is connected with an end of first main switch, an end of second main switch and an end of filter capacitor respectively; The other end of described first inductance is connected with the other end of first main switch and an end of first electric capacity respectively; The negative electrode of described first diode is connected with the other end of first electric capacity and an end of second inductance respectively; The negative electrode of described second diode is connected with an end of second electric capacity and the anode of fly-wheel diode respectively; The other end of described second main switch is connected with the other end of second inductance and the other end of second electric capacity respectively, and the other end of described filter capacitor is connected with the negative electrode of fly-wheel diode.
The two ends of described filter capacitor are connected with load.
Compared with prior art; The present invention is on the basis of traditional voltage boosting dc converter topologies; Organize the modes of inductance and capacitances in series work more when many group inductance are with electric capacity parallel operation, discharge mode when the charge mode, realized a kind of new circuit topological structure.The present invention has the following advantages:
1) main switch S
1And S
2Conducting simultaneously, end simultaneously, its control ratio is easier to realize, and, has realized high-gain adopting under the less duty ratio condition;
2) owing to shortened the ON time of main switch, effectively reduce the peak value of input current, and reduced the switch conduction loss;
3) ripple of output voltage is reduced;
4) voltage stress of main switch is by V
oBe reduced to respectively
And V
o-V
In, can select the lower switching device of voltage withstand class, reduce the hardware manufacturing cost;
5) need not to use transformer, coupling inductance and multistage connecting mode, circuit topological structure is simple;
6) compare with traditional voltage boosting dc transducer, that the present invention can realize is efficient, small-sized, low noise, target cheaply.
Description of drawings
Fig. 1 is the structural representation of traditional voltage boosting dc transducer;
Fig. 2 is the structural representation of boost converter of the present invention;
Fig. 3 is the duty ratio of embodiment and the relation curve of gain;
Fig. 4 is each voltage sketch map of embodiment;
Fig. 5 is the input current of embodiment and the relation curve of switching time;
Fig. 6 is the output voltage ripple of embodiment and the relation curve of switching time.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment 1
As shown in Figure 2, a kind of high-gain DC-DC boost converter that is applicable to photovoltaic generating system comprises input power supply, the first main switch S
1, the second main switch S
2, first inductance L
1, second inductance L
2, the first diode D
1, the second diode D
2, first capacitor C
1, second capacitor C
2, sustained diode
oWith filter capacitor C
o, the positive pole of described input power supply respectively with first inductance L
1An end, the first diode D
1The anode and the second diode D
2Anode connect, the negative pole of input power supply respectively with the first main switch S
1An end, the second main switch S
2An end and filter capacitor C
oAn end connect described first inductance L
1The other end respectively with the first main switch S
1The other end and first capacitor C
1An end connect the described first diode D
1Negative electrode respectively with first capacitor C
1The other end and second inductance L
2An end connect the described second diode D
2Negative electrode respectively with second capacitor C
2An end and sustained diode
oAnode connect the described second main switch S
2The other end respectively with second inductance L
2The other end and second capacitor C
2The other end connect described filter capacitor C
oThe other end and sustained diode
oNegative electrode connect.Described filter capacitor C
oTwo ends be connected with load R
o
The above-mentioned operating state of high-gain DC-DC boost converter in a switch periods of photovoltaic generating system that be applicable to can be divided into two stages;
The 1st stage: the first main switch S
1With the second main switch S
2During conducting, first inductance L
1, second inductance L
2And first capacitor C
1, second capacitor C
2Get into the energy storage stage, charge by the input power supply; Filter capacitor C
oDischarge is to load R
oEnergy supply.
The 2nd stage: the first main switch S
1With the second main switch S
2When ending, sustained diode
oForward conduction, first inductance L
1, second inductance L
2And first capacitor C
1, second capacitor C
2Get into the exoergic stage, with input power to filter capacitor C
oCharging, and give load R
oPower supply.
According to the magnetic balance principle, under identical duty ratio condition, the gain of high-gain DC-DC boost converter of the present invention can be calculated as
Greater than traditional gain
V in the formula
InBe input voltage, V
oBe output voltage, d is a duty ratio.The duty ratio between the two and the relation curve of gain are as shown in Figure 3.
Fig. 4 is input voltage V
In=15V, output voltage V
o=75V, output current I
oThe simulation waveform of=5A can be found out duty ratio d=0.5 at this moment.If the first diode D
1, first capacitor C
1With second inductance L
2Intersection point be X, the first main switch S
1, first inductance L
1With first capacitor C
1Intersection point be Y, the some X with the some Y voltage be respectively V
xAnd V
y, the first main switch S
1Voltage stress V
Ds1For
The second main switch S
2Voltage stress V
Ds2For
V
Ds2=V
o-V
In=75-15=60V meets above theory analysis.
Fig. 5 and Fig. 6 are respectively the relation of input current, output voltage ripple and switching time, also can find out through reducing the switch conduction time, can effectively reduce input current amplitude and output voltage ripple.
Claims (2)
1. high-gain DC-DC boost converter that is applicable to photovoltaic generating system; It is characterized in that; Comprise input power supply, first main switch, second main switch, first inductance, second inductance, first diode, second diode, first electric capacity, second electric capacity, fly-wheel diode and filter capacitor; The positive pole of described input power supply is connected with an end of first inductance, the anode of first diode and the anode of second diode respectively; The negative pole of input power supply is connected with an end of first main switch, an end of second main switch and an end of filter capacitor respectively; The other end of described first inductance is connected with the other end of first main switch and an end of first electric capacity respectively; The negative electrode of described first diode is connected with the other end of first electric capacity and an end of second inductance respectively; The negative electrode of described second diode is connected with an end of second electric capacity and the anode of fly-wheel diode respectively, and the other end of described second main switch is connected with the other end of second inductance and the other end of second electric capacity respectively, and the other end of described filter capacitor is connected with the negative electrode of fly-wheel diode.
2. a kind of high-gain DC-DC boost converter that is applicable to photovoltaic generating system according to claim 1 is characterized in that the two ends of described filter capacitor are connected with load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102259079A CN102751866A (en) | 2012-07-02 | 2012-07-02 | High-gain DC (Direct Current)-DC boost converter applicable to photovoltaic generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102259079A CN102751866A (en) | 2012-07-02 | 2012-07-02 | High-gain DC (Direct Current)-DC boost converter applicable to photovoltaic generation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102751866A true CN102751866A (en) | 2012-10-24 |
Family
ID=47031821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102259079A Pending CN102751866A (en) | 2012-07-02 | 2012-07-02 | High-gain DC (Direct Current)-DC boost converter applicable to photovoltaic generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102751866A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391001A (en) * | 2013-08-05 | 2013-11-13 | 江苏博纬新能源科技有限公司 | High-gain DCDC converter for MPPT link of photovoltaic inverter |
| CN103391018A (en) * | 2013-07-19 | 2013-11-13 | 江苏斯达工业科技有限公司 | Topological structure of electric power convertor and control method of topological structure |
| CN104319798A (en) * | 2014-11-17 | 2015-01-28 | 阳光电源股份有限公司 | Bidirectional DCDC converter and optical storage system |
| CN105515377A (en) * | 2016-01-26 | 2016-04-20 | 上海电力学院 | Soft switch high gain direct current converter based on coupling inductances and voltage doubling capacitors |
| CN107465342A (en) * | 2017-08-24 | 2017-12-12 | 上海电力学院 | High-gain low stress booster converter based on L C D structures |
| CN109256946A (en) * | 2018-09-25 | 2019-01-22 | 哈尔滨理工大学 | A kind of high-gain fuel cell car DC/DC converter |
| TWI665859B (en) * | 2017-10-25 | 2019-07-11 | National Chin-Yi University Of Technology | Boost converter and boost system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510218A (en) * | 2011-11-04 | 2012-06-20 | 安徽工业大学 | Direct current to direct current (DC-DC) power converter with high boost ratio |
-
2012
- 2012-07-02 CN CN2012102259079A patent/CN102751866A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510218A (en) * | 2011-11-04 | 2012-06-20 | 安徽工业大学 | Direct current to direct current (DC-DC) power converter with high boost ratio |
Non-Patent Citations (1)
| Title |
|---|
| LUNG-SHENG YANG,ET AL: "Transformerless DC–DC Converters With High Step-Up Voltage Gain", 《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391018A (en) * | 2013-07-19 | 2013-11-13 | 江苏斯达工业科技有限公司 | Topological structure of electric power convertor and control method of topological structure |
| CN103391001A (en) * | 2013-08-05 | 2013-11-13 | 江苏博纬新能源科技有限公司 | High-gain DCDC converter for MPPT link of photovoltaic inverter |
| CN103391001B (en) * | 2013-08-05 | 2016-02-10 | 江苏博纬新能源科技有限公司 | For the high-gain DC/DC converter of MPPT link of photovoltaic inverter |
| CN104319798A (en) * | 2014-11-17 | 2015-01-28 | 阳光电源股份有限公司 | Bidirectional DCDC converter and optical storage system |
| CN105515377A (en) * | 2016-01-26 | 2016-04-20 | 上海电力学院 | Soft switch high gain direct current converter based on coupling inductances and voltage doubling capacitors |
| CN107465342A (en) * | 2017-08-24 | 2017-12-12 | 上海电力学院 | High-gain low stress booster converter based on L C D structures |
| TWI665859B (en) * | 2017-10-25 | 2019-07-11 | National Chin-Yi University Of Technology | Boost converter and boost system |
| CN109256946A (en) * | 2018-09-25 | 2019-01-22 | 哈尔滨理工大学 | A kind of high-gain fuel cell car DC/DC converter |
| CN109256946B (en) * | 2018-09-25 | 2020-03-06 | 哈尔滨理工大学 | High-gain fuel cell automobile DC/DC converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101552554B (en) | Control circuit of cascade type buck-boost converter and control method thereof | |
| CN102751866A (en) | High-gain DC (Direct Current)-DC boost converter applicable to photovoltaic generation system | |
| CN101895223B (en) | Double-Cuk buck-boost output parallel-type converter | |
| CN103346672B (en) | Multi-stage single switch boost converter | |
| CN107896059B (en) | Capacitor clamp type high-gain boost converter based on staggered parallel connection | |
| CN202424533U (en) | Wide-region high-voltage output converter | |
| CN103095134A (en) | Active network boost converter | |
| CN103633839A (en) | Improved Z-source boosting DC (direct current)-DC converter | |
| CN104702105A (en) | Boost converter for similar active switch inductance network | |
| CN205178878U (en) | Single switch high -gain converter that contains voltage -multiplying unit | |
| CN107919797B (en) | Wide input range interleaving parallel connection type high-efficiency boost direct-current converter for fuel cell | |
| CN104779790A (en) | Switched inductance quasi-Z source DC-DC converter circuit | |
| CN103259442B (en) | A kind of High-gain current type inverter | |
| CN102290987A (en) | Switching power supply circuit | |
| CN103825457A (en) | Quasi-Z-source DC-DC boost converter circuit | |
| CN104009633A (en) | Current continuous type high-gain DC-DC converter circuit | |
| CN103633840A (en) | Single-switch high-gain boosting DC (direct current)/DC converter | |
| CN103066841B (en) | A kind of times die mould DC converter based on charge pump capacitor | |
| CN103391001A (en) | High-gain DCDC converter for MPPT link of photovoltaic inverter | |
| CN203883673U (en) | Improved Z-source boost DC-DC converter | |
| CN104052271B (en) | Z-source high-gain direct current boost converter | |
| CN109672332A (en) | A kind of zero ripple DC-DC converter of single tube high-gain | |
| CN101478253B (en) | Single-phase voltage-boosting push-pull inverter circuit | |
| CN102710126B (en) | High-gain type step-up direct current converter | |
| CN102437773A (en) | Pulse generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20121024 |