CN102710126A - High-gain type step-up direct current converter - Google Patents
High-gain type step-up direct current converter Download PDFInfo
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- CN102710126A CN102710126A CN201210189445XA CN201210189445A CN102710126A CN 102710126 A CN102710126 A CN 102710126A CN 201210189445X A CN201210189445X A CN 201210189445XA CN 201210189445 A CN201210189445 A CN 201210189445A CN 102710126 A CN102710126 A CN 102710126A
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- power supply
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Abstract
The invention relates to a high-gain type step-up direct current converter, which comprises an input power supply, a main switch, a freewheel diode and a filter capacitor; the cathode of the input power supply and one end of a main switch are connected with one end of the filter capacitor; the other end of the filter capacitor is connected with the cathode of the freewheel diode; the converter further comprises a clamp capacitor and a boosting unit; two ends of the clamp capacitor are respectively connected with the anodes of the main switch and the freewheel diode; the two output ends of the boosting unit are respectively connected with two ends of the clamp capacitor; and the input end of the boosting unit is connected with the anode of the input power supply. Compared with the prior art, the converter provided by the invention has the advantages of high gain, low noise, low cost and the like.
Description
Technical field
The present invention relates to a kind ofly convert low pressure the voltage boosting dc transducer of high pressure into, especially relate to a kind of high-gain type voltage boosting dc transducer.
Background technology
Be in the distributed generation system of input source with solar energy, wind energy, fuel cell and storage battery etc.; Because these input sources have input power supply lower characteristic, possessing the voltage boosting dc transducer that converts low pressure into high pressure becomes indispensable critical component.Traditional voltage boosting dc transducer is as shown in Figure 1.In order to obtain the higher voltage conversion gain, the method that adopts usually is in traditional voltage boosting dc transducer, 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, certain shortcoming that these modes all exist:
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 (Electromagnetic Interference, electromagnetic interference).
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, low noise, target cheaply.
Summary of the invention
The object of the invention is exactly that a kind of high voltage conversion gain, low noise, high-gain type voltage boosting dc transducer cheaply of obtaining is provided in order to overcome the defective that above-mentioned prior art exists.
The object of the invention can be realized through following technical scheme:
A kind of high-gain type voltage boosting dc transducer; Comprise input power supply, main switch, fly-wheel diode and filter capacitor; One end of the negative pole of described input power supply, main switch and an end of filter capacitor are connected mutually; The other end of described filter capacitor connects the negative electrode of fly-wheel diode, and described transducer also comprises clamp capacitor and boosting unit, and the two ends of described clamp capacitor connect the anode of main switch and fly-wheel diode respectively; Two outputs of described boosting unit are connected with the two ends of clamp capacitor respectively, and the input of described boosting unit is connected with the positive pole of input power supply.
Described boosting unit comprises first inductance, second inductance, first electric capacity, second electric capacity, first diode and second diode; Described first inductance, one end connects the positive pole and first electric capacity of importing power supply respectively; The other end connects the clamp capacitor and second electric capacity respectively; Described second inductance, one end connects the negative electrode and second electric capacity of first diode respectively; The other end connects the anode and first electric capacity of second diode respectively, and the anode of described first diode is connected with the positive pole of input power supply, and the negative electrode of described second diode is connected with clamp capacitor.
Described transducer also comprises auxiliary switch and the 3rd inductance, and described the 3rd inductance one end connects clamp capacitor, and the other end connects the anode of fly-wheel diode, and described auxiliary switch one end connects main switch, and the other end connects the 3rd inductance.
Compared with prior art, the present invention through adopting simple inductance and electric capacity series-parallel system, has realized a kind of new circuit topological structure on the basis of traditional voltage boosting dc converter topologies.The present invention has the following advantages:
1) can obtain the higher voltage conversion gain;
2) shortened the ON time of main switch, effectively reduced the peak value of input current, and reduced conduction loss;
3) reduce the ripple of output voltage;
4) reduce the voltage stress that is added in the main switch two ends, can select the lower switching device of voltage withstand class, reduced 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 high-gain type voltage boosting dc transducer can be realized 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 transducer of the present invention;
Fig. 3 is the relation curve of duty ratio and output voltage among the embodiment 1;
Fig. 4 is each voltage sketch map among the embodiment 1;
Fig. 5 is input current and the relation curve of switching time among the embodiment 1;
Fig. 6 is the relation curve of output voltage ripple and switching time;
Fig. 7 is the another kind of structural representation of transducer of the present invention;
Fig. 8 is the relation curve of duty ratio and output voltage among the embodiment 2;
Fig. 9 is each voltage sketch map among the embodiment 2.
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 type voltage boosting dc transducer comprises input power supply, main switch S, sustained diode
o, filter capacitor C
o, clamp capacitor C
cAnd boosting unit, the end of the negative pole of described input power supply, main switch S and filter capacitor C
oAn end connect described filter capacitor C mutually
oThe other end connect sustained diode
oNegative electrode, described transducer also comprises clamp capacitor C
cAnd boosting unit, described clamp capacitor C
cTwo ends connect main switch S and sustained diode respectively
oAnode, two outputs of described boosting unit respectively with clamp capacitor C
cTwo ends connect, the input of described boosting unit is connected with the positive pole of importing power supply.
Described boosting unit comprises first inductance L
1, second inductance L
2, first capacitor C
1, second capacitor C
2, the first diode D
1With the second diode D
2, described first inductance L
1One end connects the positive pole and first capacitor C of importing power supply respectively
1, the other end connects clamp capacitor C respectively
cWith second capacitor C
2, described second inductance L
2One end connects the first diode D respectively
1The negative electrode and second capacitor C
2, the other end connects the second diode D respectively
2The anode and first capacitor C
1, the described first diode D
1Anode with the input power supply positive pole be connected the described second diode D
2Negative electrode and clamp capacitor C
cConnect.
The operating state of above-mentioned high-gain type voltage boosting dc transducer in a switch periods can be divided into two stages;
The 1st stage: during main switch S conducting, first inductance L
1Get into the energy storage stage, charge by the input power supply; Second inductance L 2 gets into the exoergic stage simultaneously, through clamp capacitor C
cPotential difference (V with the input power supply
Cc-V
In) discharge.
The 2nd stage: when main switch S ends, inductance L
1Get into the exoergic stage, D
oForward conduction is through output voltage, clamp capacitor C
cPotential difference (V with the input power supply
o-V
Cc-V
In) discharge; The while inductance L
2Get into the energy storage stage, utilize output voltage, clamp capacitor C
cPotential difference (V with the input power supply
o-V
Cc-V
In) charge.
According to the magnetic balance principle, under identical duty ratio condition, the gain of present embodiment high-gain type booster type direct current transducer can be calculated as
Clamp capacitor voltage V
Cc=V
In* 2; The voltage stress of switch: V
Ds=V
o-V
Cc=V
o-2V
In, wherein d is the duty ratio of main switch S.
The gain of present embodiment transducer is as shown in Figure 3 greater than traditional gain
duty ratio between the two and the relation curve of output voltage.Fig. 4 is input power supply Vin=50V, output voltage V
o=200V, output current I
oThe simulation waveform of=5A can be found out duty ratio d=0.5 at this moment, the voltage stress V of main switch
Ds=V
o-2V
In=200-100=100V (V
DsStudy drain electrode-source voltage for main switch S), meet above theory analysis.Among Fig. 4, V
GsGrid-source voltage for main switch S.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.
Embodiment 2
As shown in Figure 7, a kind of high-gain type voltage boosting dc transducer, with the similar among the embodiment 1, difference is that the transducer in the present embodiment also comprises auxiliary switch S
2With the 3rd inductance L
3, described the 3rd inductance L
3One end connects clamp capacitor C
c, the other end connects sustained diode
oAnode, described auxiliary switch S
2One end connects main switch S, and the other end connects the 3rd inductance L
3
The operating state of high-gain type booster type direct current transducer in a switch periods in the present embodiment can be divided into two stages;
The 1st stage: main switch S
1, S
2Conducting together, inductance L
1Get into the energy storage stage, charge by the input power supply.Inductance L
2Get into the exoergic stage, through clamp capacitor C
cPotential difference (V with the input power supply
Cc-V
In) discharge, simultaneously, inductance L
3Also get into the energy storage stage, by clamp capacitor C
cVoltage V
CcCharge.
The 2nd stage: main switch S
1, S
2End inductance L together
1Get into the exoergic stage, D
oForward conduction is through V
1Point, clamp capacitor C
cPotential difference (V with the input power supply
1-V
Cc-V
In) discharge.Inductance L
2Get into the energy storage stage, utilize V
1Current potential, clamp capacitor C
cPotential difference (V with the input power supply
1-V
Cc-V
In) charge.Simultaneously, inductance L
3Also get into the exoergic stage, by output voltage V
oAnd V
1Potential difference (V
o-V
1) discharge.
According to the magnetic balance principle, under identical duty ratio condition, the gain of present embodiment high-gain type booster type direct current transducer can be calculated as
V1 point current potential
Clamp capacitor voltage V
Cc=V
In* 2; The voltage stress of main switch
The voltage stress of auxiliary switch
The gain of present embodiment transducer is as shown in Figure 8 greater than traditional gain
duty ratio between the two and the relation curve of output voltage.Fig. 9 is input power supply V
In=50V, output voltage V
o=300V, the simulation waveform of output current Io=5A can be found out duty ratio d=0.5 at this moment, the voltage stress V of main switch
Ds=V
o-2V
In=200-100=100V meets above theory analysis.
Claims (3)
1. high-gain type voltage boosting dc transducer; Comprise input power supply, main switch, fly-wheel diode and filter capacitor; The negative pole of described input power supply is connected with an end of main switch, an end of filter capacitor respectively, and the other end of described filter capacitor connects the negative electrode of fly-wheel diode, it is characterized in that; Described transducer also comprises clamp capacitor and boosting unit; The two ends of described clamp capacitor connect the other end of main switch and the anode of fly-wheel diode respectively, and two outputs of described boosting unit are connected with the two ends of clamp capacitor respectively, and the input of described boosting unit is connected with the positive pole of input power supply.
2. a kind of high-gain type voltage boosting dc transducer according to claim 1; It is characterized in that; Described boosting unit comprises first inductance, second inductance, first electric capacity, second electric capacity, first diode and second diode, and described first inductance, one end connects the positive pole and first electric capacity of importing power supply respectively, and the other end connects the clamp capacitor and second electric capacity respectively; Described second inductance, one end connects the negative electrode and second electric capacity of first diode respectively; The other end connects the anode and first electric capacity of second diode respectively, and the anode of described first diode is connected with the positive pole of input power supply, and the negative electrode of described second diode is connected with clamp capacitor.
3. a kind of high-gain type voltage boosting dc transducer according to claim 2; It is characterized in that; Described transducer also comprises auxiliary switch and the 3rd inductance, and described the 3rd inductance one end connects clamp capacitor, and the other end connects the anode of fly-wheel diode; Described auxiliary switch one end connects main switch, and the other end connects the 3rd inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210189445.XA CN102710126B (en) | 2012-06-08 | 2012-06-08 | High-gain type step-up direct current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210189445.XA CN102710126B (en) | 2012-06-08 | 2012-06-08 | High-gain type step-up direct current converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102710126A true CN102710126A (en) | 2012-10-03 |
| CN102710126B CN102710126B (en) | 2014-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210189445.XA Expired - Fee Related CN102710126B (en) | 2012-06-08 | 2012-06-08 | High-gain type step-up direct current converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066841A (en) * | 2013-01-28 | 2013-04-24 | 上海电力学院 | Voltage-multiplying DC converter based on charge pump capacitor |
| CN108092506A (en) * | 2017-12-12 | 2018-05-29 | 东南大学 | A kind of single bootstrapping grade Square-type high-gain converter |
| CN109861524A (en) * | 2018-12-17 | 2019-06-07 | 北京交通大学 | The high gain boost DC converter of fuel cell power generation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100085787A1 (en) * | 2008-10-03 | 2010-04-08 | Ajit Wasant Kane | System and method for powering a hybrid electric vehicle |
| US20120039095A1 (en) * | 2010-08-12 | 2012-02-16 | Samsung Electro-Mechanics Co., Ltd. | Boost converter |
| CN102364852A (en) * | 2011-10-24 | 2012-02-29 | 杭州浙阳电气有限公司 | Single switching tube high-grain converter based on coupling inductance voltage-multiplying unit |
-
2012
- 2012-06-08 CN CN201210189445.XA patent/CN102710126B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100085787A1 (en) * | 2008-10-03 | 2010-04-08 | Ajit Wasant Kane | System and method for powering a hybrid electric vehicle |
| US20120039095A1 (en) * | 2010-08-12 | 2012-02-16 | Samsung Electro-Mechanics Co., Ltd. | Boost converter |
| CN102364852A (en) * | 2011-10-24 | 2012-02-29 | 杭州浙阳电气有限公司 | Single switching tube high-grain converter based on coupling inductance voltage-multiplying unit |
Non-Patent Citations (1)
| Title |
|---|
| 侯世英等: "改进型Z源逆变器", 《电力自动化设备》, vol. 31, no. 8, 31 August 2011 (2011-08-31) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066841A (en) * | 2013-01-28 | 2013-04-24 | 上海电力学院 | Voltage-multiplying DC converter based on charge pump capacitor |
| CN103066841B (en) * | 2013-01-28 | 2016-03-02 | 上海电力学院 | A kind of times die mould DC converter based on charge pump capacitor |
| CN108092506A (en) * | 2017-12-12 | 2018-05-29 | 东南大学 | A kind of single bootstrapping grade Square-type high-gain converter |
| CN109861524A (en) * | 2018-12-17 | 2019-06-07 | 北京交通大学 | The high gain boost DC converter of fuel cell power generation |
| CN109861524B (en) * | 2018-12-17 | 2020-09-25 | 北京交通大学 | High-gain boost DC converter for fuel cell power generation |
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| Publication number | Publication date |
|---|---|
| CN102710126B (en) | 2014-12-17 |
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Granted publication date: 20141217 Termination date: 20170608 |