CN105576971B - Input, the continuous three level Buck converters of output current - Google Patents
Input, the continuous three level Buck converters of output current Download PDFInfo
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- CN105576971B CN105576971B CN201610158411.2A CN201610158411A CN105576971B CN 105576971 B CN105576971 B CN 105576971B CN 201610158411 A CN201610158411 A CN 201610158411A CN 105576971 B CN105576971 B CN 105576971B
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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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of input, the continuous three level Buck converters of output current, which includes the first SDC network structures and the 2nd SDC network structures, and the first SDC network structures include derided capacitors C1, switching tube S1With diode D1, diode D1Anode and derided capacitors C1Connection, diode D1Cathode and switching tube S1Connection；2nd SDC network structures include derided capacitors C2, switching tube S2With diode D2, diode D2Cathode and derided capacitors C2Connection, diode D1Anode and switching tube S2Connection.The input of the converter of the present invention, output current are continuous, voltage gain is identical with traditional Buck converters, and power tube voltage stress becomes half under the same conditions, the ripple frequency of filter capacitor voltage and filter inductance electric current is 2 times of switching frequency, and above-mentioned conclusion confirms the correctness of the three level Buck converter topologies.
Description
Technical field
The invention belongs to converter technical fields, and in particular to a kind of input, the continuous three level Buck of output current
Converter.
Background technology
Regenerative resource with accumulation energy type load is combined, regenerative resource can be utilized to greatest extent, so as to effectively
Alleviating energy crisis and mitigation environmental pollution.For this purpose, occur the photovoltaic charged stake of electric vehicle, photovoltaic energy storage power station etc. in recent years
Various new photovoltaic utilizes form.In these photovoltaic systems, photovoltaic array is mostly straight using Buck converters and accumulator group
It is connected together in succession, forms high-voltage large-capacity photovoltaic energy storage system.Wherein, Buck converters are both photovoltaic interface, while are again
The charger of accumulator.
In order to improve the MPPT efficiency of photovoltaic energy storage system, it is necessary to reduce the current ripples of photovoltaic cell as much as possible.So
And the input current of traditional Buck converters is interrupted.For this purpose, needed in practical application Buck converters input side simultaneously
Join the electrolytic capacitor of high-voltage large-capacity, this can undoubtedly increase volume, the cost of system, and service life can greatly shorten.This
Outside, in order to meet the requirement of the voltage class of high-voltage large-capacity photovoltaic energy storage system, Buck converters are typically employed to high voltage
IGBT or CoolMOS are as switching tube.However, the switching speed of IGBT is relatively low, it is unfavorable for the miniaturization and lightweight of system；
And CoolMOS's is at high price, and cost is caused to rise.
Invention content
Goal of the invention：The purpose of the present invention is to solve deficiency of the prior art, provide and a kind of novel input, is defeated
Go out the continuous three level Buck converters of electric current.The input of the converter, output current are continuous, therefore only need defeated
Enter, the thin-film capacitor of outlet side parallel connection low capacity is with regard to that can meet the current ripples index request of photovoltaic energy storage system, system is reliable
Property greatly improves；The voltage stress of power device is only the half of input voltage so that the use of low pressure MOSFET is possibly realized；
The ripple frequency of filter capacitor voltage and filter inductance electric current is twice of switching frequency, so as to effectively reduce the body of wave filter
Product and weight.
Technical solution：A kind of input of the present invention, the continuous three level Buck converters of output current, including the
One SDC network structures and the 2nd SDC network structures, the first SDC network structures include derided capacitors C1, switching tube S1With two
Pole pipe D1, the diode D1Anode and derided capacitors C1Connection, the diode D1Cathode and switching tube S1Connection；It is described
2nd SDC network structures include derided capacitors C2, switching tube S2With diode D2, the diode D2Cathode and derided capacitors C2
Connection, the diode D1Anode and switching tube S2Connection；The diode D1Anode and the diode D2Cathode it
Between be also associated with filter inductance L2, the diode D1Cathode and the diode D2Anode between be also associated with filtered electrical
Feel L1 and output filter capacitor Co。
Further, the switching tube S1And S2Using Interleaved control mode, the duty ratio of drive signal is identical, but phase
Difference 180.
Further, the derided capacitors C1With derided capacitors C2It is equal in magnitude.
The invention also discloses a kind of above-mentioned input, the controlling parties of the continuous three level Buck converters of output current
Method, course of work control of the converter in a switch periods are divided into 4 mode, and above-mentioned 4 mode is divided into duty ratio D
>=0.5 and duty ratio D<0.5 two kinds of situations：
(A) during duty ratio D >=0.5：
(1) mode 1, t0-t1：In t0Moment, S1And S2Open-minded, D simultaneously1And D2Because bearing backward voltage Uin/ 2 and turn off；
Inductance L1Terminal voltage be Uin-Uo>0, electric current starts linearly increasing, inductance L2Terminal voltage be 0；
(2) mode 2, t1-t2：t1Moment turns off S2, mode 1 terminates；D at this time2Conducting, inductance L1Terminal voltage be Uin/2-
Uo≤ 0, electric current starts linear decline, inductance L2Terminal voltage be 0；
(3) mode 3, t2-t3：t2Moment opens S2, mode 2 terminates；Converter working condition is identical with mode 1 at this time；
(4) mode 4, t3-t4：t3Moment turns off S1, mode 3 terminates；At this point, D1Conducting, inductance L1Terminal voltage be Uin/2-
Uo≤ 0, electric current starts linear decline, inductance L2Terminal voltage be 0；
(B) duty ratio D<When 0.5：
(1) mode 1, t0-t1：In t0Moment, S1It is open-minded, S2Shutdown；D at this time2Conducting, inductance L1Terminal voltage is Uin/2-Uo>
0, electric current starts linear rise, inductance L2Terminal voltage be 0；
(2) mode 2, t1-t2：t1Moment turns off S1, mode 1 terminates；D at this time1And D2It is both turned on, inductance L1Terminal voltage is equal
For-Uo<0, electric current starts linear decline, inductance L2Terminal voltage be 0；
(3) mode 3, t2-t3：t2Moment opens S2, mode 2 terminates；D at this time1Conducting, inductance L1Terminal voltage be Uin/
2-Uo>0, electric current starts linear rise, inductance L2Terminal voltage be 0；
(4) mode 4, t3-t4：t3Moment turns off S2, mode 3 terminates；Converter working condition is identical with mode 2 at this time.
Further, which has the voltage gain as tradition Buck converters；The voltage stress of power tube
Reduce half；The ripple frequency of filter inductance electric current and output filter capacitor terminal voltage is twice of switching frequency.
Advantageous effect：A kind of novel input provided by the invention, the continuous three level Buck converters of output current,
The input of the converter, output current are continuous, thus only need input, outlet side parallel connection low capacity thin-film capacitor with regard to energy
Meet the current ripples index request of photovoltaic energy storage system, system reliability greatly improves；The voltage stress of power device is only
The half of input voltage so that the use of low pressure MOSFET is possibly realized；The pulsation of filter capacitor voltage and filter inductance electric current
Frequency is twice of switching frequency, so as to effectively reduce the volume and weight of wave filter.
Description of the drawings
Fig. 1 is the converter of the present invention and its TL topological structure schematic diagrames；
Fig. 2 is the equivalent circuit diagram of the different switch mode of the present invention；
Fig. 3 is working waveform figure of the present invention in duty ratio D >=0.5；
Fig. 4 is the present invention in duty ratio D<Working waveform figure when 0.5；
Experimental waveform when Fig. 5 is duty ratio D=0.25；
Experimental waveform when Fig. 6 is duty ratio D=0.75.
Specific embodiment
A kind of input as shown in Figure 1, the continuous three level Buck converters of output current, including the first SDC networks
Structure and the 2nd SDC network structures, the first SDC network structures include derided capacitors C1, switching tube S1With diode D1, institute
State diode D1Anode and derided capacitors C1Connection, the diode D1Cathode and switching tube S1Connection；2nd SDC
Network structure includes derided capacitors C2, switching tube S2With diode D2, the diode D2Cathode and derided capacitors C2Connection, institute
State diode D1Anode and switching tube S2Connection；The diode D1Anode and the diode D2Cathode between also connect
It is connected to filter inductance L2, the diode D1Cathode and the diode D2Anode between be also associated with filter inductance L1 and
Output filter capacitor Co。
In Fig. 1, S1、S2For switching tube, and S1And S2Using Interleaved control mode, i.e. the duty ratio of drive signal is identical, but
It is that phase differs 180 °；D1、D2For diode；L1、L2For filter inductance；C1、C2For derided capacitors, and C1=C2；CoIt is filtered for output
Wave capacitance.
The operation principle and characteristic of the continuous three level Buck converters of the input, output current are analyzed in detail below.
Process for simplifying the analysis first makees following basic assumption：1. all power tubes and filter element are ideal component；②C1、C2Foot
Enough big, ripple is ignored, therefore has Uc1=Uc2=Uin/2；3. output capacitance CoIt is sufficiently large, voltage source U can be equivalent too。
Based on above-mentioned it is assumed that the course of work of the converter in a switch periods is divided into 4 mode during stable state, each
The corresponding equivalent circuit of mode is as shown in Figure 2.Due to D >=0.5 and D<In the case of 0.5 two kinds, the operation mode of converter is endless
It is exactly the same, it is therefore necessary to be analyzed respectively.
(1) during D >=0.5 (work wave is as shown in Figure 3)
1 [t of mode0,t1] (shown in equivalent circuit such as Fig. 2 (a))
In t0Moment, S1And S2Open-minded, D simultaneously1And D2Because bearing backward voltage Uin/ 2 and turn off；Inductance L1Terminal voltage be
Uin-Uo>0, electric current starts linearly increasing, inductance L2Terminal voltage be 0.
2 [t of mode1,t2] (shown in equivalent circuit such as Fig. 2 (b))
t1Moment turns off S2, mode 1 terminates.At this point, D2Conducting, inductance L1Terminal voltage be Uin/2-Uo≤ 0, electric current is opened
Beginning linear decline, inductance L2Terminal voltage be 0.
3 [t of mode2,t3] (shown in equivalent circuit such as Fig. 2 (a))
t2Moment opens S2, mode 2 terminates.At this point, converter working condition is identical with mode 1, details are not described herein.
4 [t of mode3,t4] (shown in equivalent circuit such as Fig. 2 (c))
t3Moment turns off S1, mode 3 terminates.At this point, D1Conducting, inductance L1Terminal voltage be Uin/2-Uo≤ 0, electric current is opened
Beginning linear decline, inductance L2Terminal voltage be 0.
(2)D<When 0.5 (work wave is as shown in Figure 4)
1 [t of mode0,t1] (shown in equivalent circuit such as Fig. 2 (b))
In t0Moment, S1It is open-minded, S2Shutdown.At this point, D2Conducting, inductance L1Terminal voltage is Uin/2-Uo>0, electric current initial
Property rise, inductance L2Terminal voltage be 0.
2 [t of mode1,t2] (shown in equivalent circuit such as Fig. 2 (d))
t1Moment turns off S1, mode 1 terminates.At this point, D1And D2It is both turned on, inductance L1Terminal voltage is-Uo<0, electric current is opened
Beginning linear decline, inductance L2Terminal voltage be 0.
3 [t of mode2,t3] (shown in equivalent circuit such as Fig. 2 (c))
t2Moment opens S2, mode 2 terminates.At this point, D1Conducting, inductance L1Terminal voltage be Uin/2-Uo>0, electric current
Start linear rise, inductance L2Terminal voltage be 0.
4 [t of mode3,t4] (shown in equivalent circuit such as Fig. 2 (d))
t3Moment turns off S2, mode 3 terminates.At this point, converter working condition is identical with mode 2, details are not described herein.It is special
Property analysis：
(1) voltage gain
It can be respectively obtained by voltage-second balance：
Above-mentioned two formula is solved respectively, it is available：
This shows that there is three level Buck converters proposed by the present invention the voltage as tradition Buck converters to increase
Benefit.
(2) power tube voltage stress
It can be seen from Fig. 3 and Fig. 4 in the entire variation range of duty ratio D, the voltage of all switching tubes and diode
Stress is Uin/ 2, it is the half of tradition Buck inverter power tube voltage stress.
(3) ripple frequency of filter inductance electric current and filter capacitor voltage
It can also be seen that the input of three level Buck converters proposed by the present invention, output current connect by Fig. 3 and Fig. 4
It is continuous, but the ripple frequency of filter inductance electric current becomes twice of switching frequency.Moreover, filter capacitor CoCharge and discharge electric frequency
2 times for switching frequency.It means that under conditions of voltage, pulsation of current permissible value and switching frequency all same, three electricity
The capacitance and inductance value of flat Buck converters can be reduced to the half of traditional Buck converters.
In conclusion input proposed by the present invention, the continuous three level Buck converters of output current, have and traditional
The same voltage gain of Buck converters；The voltage stress of power tube reduces half；Filter inductance electric current and output filter
The ripple frequency of capacitance terminal voltage is twice of switching frequency.These characteristics comply fully with the basic of three-level DC converter
Feature, so as to prove the correctness of the three-level topology.
For the correctness of proof theory analysis, simulating, verifying is carried out using saber simulation softwares, design objective is such as
Under：Switching frequency is f=100kHz, DC input voitage Uin=40V-120V, output voltage Uo=30V, filter inductance L1=
500 μ H, L2=250 μ H, derided capacitors C1=C2=100 μ F, filter capacitor Co=22 μ F, S1And S2Using IRF640, D1And D2It adopts
Use MBR20200CT.
Experimental waveform during duty ratio D=0.25 and D=0.75 is set forth in Fig. 5 and Fig. 6.It can be seen that the transformation
The input and output electric current of device is continuous, and during continuous current mode, and input voltage and output voltage meet Uo=DUinRelationship；
Switching tube S1、S2With diode D1、D2Voltage stress be input voltage half.Further, it is also possible to find out, output voltage
With inductance L1、L2The ripple frequency of electric current be 2 times of switching frequency.These experimental results fit like a glove with theory analysis, from
And demonstrate the correctness of the continuous three level Buck converters of the input, output current.
The present invention proposes a kind of input, the continuous three level Buck converters of output current.Its work of detailed analysis
Make principle and characteristic, and simulating, verifying is carried out using Saber softwares.Result of study shows the defeated of the three level Buck converters
Enter, output current it is continuous, voltage gain is identical with traditional Buck converters, and power tube voltage under the same conditions
Stress becomes half, and the ripple frequency of filter capacitor voltage and filter inductance electric current is 2 times of switching frequency.Above-mentioned conclusion card
The real correctness of the three level Buck converter topologies.
The above described is only a preferred embodiment of the present invention, not make limitation in any form to the present invention, though
So the present invention is disclosed above with preferred embodiment, however is not limited to the present invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as being the content without departing from technical solution of the present invention, technical spirit according to the present invention
To any simple modification, equivalent change and modification that above example is made, in the range of still falling within technical solution of the present invention.
Claims (3)
1. a kind of input, the control method of the continuous three level Buck converters of output current, it is characterised in that：The converter
Including the first SDC network structures and the 2nd SDC network structures, the first SDC network structures include derided capacitors C1, switching tube
S1With diode D1, the diode D1Anode and derided capacitors C1Connection, the diode D1Cathode and switching tube S1Even
It connects；The 2nd SDC network structures include derided capacitors C2, switching tube S2With diode D2, the diode D2Cathode with point
Voltage capacitance C2Connection, the diode D2Anode and switching tube S2Connection；The diode D1Anode and the diode D2
Cathode between be also associated with filter inductance L2, the diode D1Cathode and the diode D2Anode between be also connected with
There are filter inductance L1 and output filter capacitor Co；The converter has the voltage gain as tradition Buck converters；Power
The voltage stress of pipe reduces half；The ripple frequency of filter inductance electric current and output filter capacitor terminal voltage is switching frequency
Twice；
Course of work control of the converter in a switch periods is divided into 4 mode, and above-mentioned 4 mode is divided into duty ratio
D >=0.5 and duty ratio D<0.5 two kinds of situations：
(A) during duty ratio D >=0.5：
(1) mode 1, t0-t1：In t0Moment, S1And S2Open-minded, D simultaneously1And D2Because bearing backward voltage Uin/ 2 and turn off；Inductance L1
Terminal voltage be Uin-Uo>0, electric current starts linearly increasing, inductance L2Terminal voltage be 0；
(2) mode 2, t1-t2：t1Moment turns off S2, mode 1 terminates；D at this time2Conducting, inductance L1Terminal voltage be Uin/2-Uo≤
0, electric current starts linear decline, inductance L2Terminal voltage be 0；
(3) mode 3, t2-t3：t2Moment opens S2, mode 2 terminates；Converter working condition is identical with mode 1 at this time；
(4) mode 4, t3-t4：t3Moment turns off S1, mode 3 terminates；At this point, D1Conducting, inductance L1Terminal voltage be Uin/2-Uo≤
0, electric current starts linear decline, inductance L2Terminal voltage be 0；
(B) duty ratio D<When 0.5：
(1) mode 1, t0-t1：In t0Moment, S1It is open-minded, S2Shutdown；D at this time2Conducting, inductance L1Terminal voltage is Uin/2-Uo>0,
Electric current starts linear rise, inductance L2Terminal voltage be 0；
(2) mode 2, t1-t2：t1Moment turns off S1, mode 1 terminates；D at this time1And D2It is both turned on, inductance L1Terminal voltage is-Uo<
0, electric current starts linear decline, inductance L2Terminal voltage be 0；
(3) mode 3, t2-t3：t2Moment opens S2, mode 2 terminates；D at this time1Conducting, inductance L1Terminal voltage be Uin/2-Uo>
0, electric current starts linear rise, inductance L2Terminal voltage be 0；
(4) mode 4, t3-t4：t3Moment turns off S2, mode 3 terminates；Converter working condition is identical with mode 2 at this time.
2. a kind of input according to claim 1, the control method of the continuous three level Buck converters of output current,
It is characterized in that：The switching tube S1And S2Using Interleaved control mode, the duty ratio of drive signal is identical, but phase differs
180。
3. a kind of input according to claim 1, the control method of the continuous three level Buck converters of output current,
It is characterized in that：The derided capacitors C1With derided capacitors C2It is equal in magnitude.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610158411.2A CN105576971B (en) | 2016-03-18 | 2016-03-18 | Input, the continuous three level Buck converters of output current |
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| CN105576971B true CN105576971B (en) | 2018-06-19 |
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| CN114888373B (en) * | 2022-06-01 | 2023-09-29 | 南京理工大学 | Three-level BUCK pulse power supply for electric spark machining |
| CN115070142B (en) * | 2022-06-01 | 2023-09-05 | 南京理工大学 | Novel peak current control method applied to electric spark machining pulse power supply |
Citations (2)
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|---|---|---|---|---|
| EP2782235A1 (en) * | 2013-03-21 | 2014-09-24 | Mitsubishi Electric R&D Centre Europe B.V. | Converter composed of at least a first and a second switches and a snubber circuit which protects the second switch |
| CN104333220A (en) * | 2014-04-10 | 2015-02-04 | 南通大学 | Low-electric-stress ZCS-PWM Superbuck converter |
-
2016
- 2016-03-18 CN CN201610158411.2A patent/CN105576971B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2782235A1 (en) * | 2013-03-21 | 2014-09-24 | Mitsubishi Electric R&D Centre Europe B.V. | Converter composed of at least a first and a second switches and a snubber circuit which protects the second switch |
| CN104333220A (en) * | 2014-04-10 | 2015-02-04 | 南通大学 | Low-electric-stress ZCS-PWM Superbuck converter |
Non-Patent Citations (2)
| Title |
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| 三电平直流变换器的研究;李斌;《中国优秀博硕士学位论文全文数据库（硕士） 信息科技辑》;20021215(第02期);第5-27页 * |
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