CN101895223A - Double-Cuk buck-boost output parallel-type converter - Google Patents

Double-Cuk buck-boost output parallel-type converter Download PDF

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Publication number
CN101895223A
CN101895223A CN2010102011727A CN201010201172A CN101895223A CN 101895223 A CN101895223 A CN 101895223A CN 2010102011727 A CN2010102011727 A CN 2010102011727A CN 201010201172 A CN201010201172 A CN 201010201172A CN 101895223 A CN101895223 A CN 101895223A
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cuk
power
inductance
diode
anode
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CN2010102011727A
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CN101895223B (en
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王立乔
王欣
邬伟扬
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Yanshan University
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Yanshan University
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Abstract

The invention discloses a double-Cuk buck-boost output parallel-type converter which is formed by connecting two Cuk-type DC/DC (direct current/direct current) converters capable of achieving the buck-boost output at the output in parallel, and can achieve the DC/AC (direct current/alternating current) single-phase conversion and further achieve the three-phase conversion through expansion. The converter has the following basic functions: the double-Cuk buck-boost output parallel-type converter can achieve the buck-boost conversion and normally serve the function of conversion even if the inputted DC voltage is lower or the variation range of the DC voltage is wider; the problem that the bridge arms are directly connected is avoided in the entire circuit, thus ensuring the high reliability; the follow current is not allowed to pass through the body diode of a switching tube, but flows through an independent diode, so that a power switching tube and a power diode can be respectively subject to optimized design; the design of circuit parameters, which is based on the method for designing a DC Cuk converter, is simple; and the inductive current runs in a continuous state, thus reducing the EMI (electro-magnetic interference). The invention is mainly applicable to the fields of photovoltaic generation, fuel-cell power generation and other power generation based on renewable energy and new energy, in which the level of operating voltage is lower or the variation range thereof is wider.

Description

Double-Cuk buck-boost output parallel-type converter
Technical field
The present invention relates to the inverter in a kind of transformation of electrical energy device, but relate in particular in the single-phase or heterogeneous inversion application scenario of the also step-down of both can boosting.
Background technology
Regenerative resource and generation of electricity by new energy technology are the reply energy crises, keep sustainable development, realize the core technology that " low-carbon (LC) " is economic.Inverter is the key component in regenerative resource and the grid-connected power generation system.Compare with traditional energy, regenerative resource and generation of electricity by new energy apparatus features are the fluctuation and the randomness of its power output, and concrete performance is exactly that the excursion of its direct voltage that provides compares broad.Specific to photovoltaic array, fuel cell and small-sized wind power generator, also have lower grade of output voltage characteristics.And traditional inverter all is a buck type buck converter structure, and the direct voltage of its input will be higher than the alternating voltage peak of output, does not fit into the needs of regenerative resource and generation of electricity by new energy technology.
To this, traditional solution has two kinds, and first kind is to add one-level DC/DC converter before inverter, improves the input voltage of inverter, but the increase of progression will certainly reduce whole efficient.Another kind is the isolated form scheme, promptly increase step-up transformer and realize electrical isolation simultaneously to improve electric pressure in converter, but the adding of transformer also will increase system cost and the whole conversion efficiency of influence.Obviously, can realize directly that the non-isolation single-stage type scheme of liftable pressure meets the needs of regenerative resource and generation of electricity by new energy technology more; The double-Cuk buck-boost output parallel-type converter that this patent proposed satisfies a kind of novel inversion scheme of above-mentioned needs just.
Summary of the invention
Goal of the invention: the objective of the invention is to make up a kind of single-phase or three-phase inverter of single-stage of realizing the buck inversion with two Cuk converters.
Technical scheme: in order to reach above-mentioned goal of the invention, double-Cuk buck-boost output parallel-type converter of the present invention comprises capacitance partial pressure circuit, a Cuk circuit and the 2nd Cuk circuit, wherein, the capacitance partial pressure circuit is made of two first electric capacity that are in series and second electric capacity, a connecting to neutral potential point that is connected in series of first electric capacity and second electric capacity, the positive pole of another termination external power supply of first electric capacity, the negative pole of another termination external power supply of second electric capacity; In the one Cuk circuit, the anode of first power diode connects positive source, negative electrode connects an end of first inductance, the anode of another termination first power switch pipe of first inductance and an end of the 3rd electric capacity, the negative electrode connecting to neutral potential point of first power switch pipe, the anode of another termination the 3rd power diode of the 3rd electric capacity and the negative electrode of the 3rd power switch pipe, the negative electrode connecting to neutral potential point of the 3rd power diode, the negative electrode of the 3rd power switch pipe connects the negative electrode of the 5th power diode, and the anode of the 5th power diode connects an end of the 3rd inductance; In the 2nd Cuk circuit, the negative electrode of second power diode connects power cathode, anode connects an end of second inductance, the negative electrode of another termination second power switch pipe of second inductance and an end of the 4th electric capacity, the anode connecting to neutral potential point of second power switch pipe, the negative electrode of another termination the 4th power diode of the 4th electric capacity and the anode of the 4th power switch pipe, the anode connecting to neutral potential point of the 4th power diode, the negative electrode of the 4th power switch pipe connects the anode of the 6th power diode, the negative electrode of the 6th power diode connects the 3rd inductance, a Cuk circuit is the same together, is connected to the same end of the 3rd inductance; Load one is terminated at the other end of the 3rd inductance, the other end connecting to neutral potential point of load.
First inductance, second inductance and the 3rd inductance can be coupled on the same magnetic core, have reduced inductance volume and magnetic core quantity greatly, and by the method for coupling, the value of single inductance also can reduce.
The double-Cuk buck-boost output parallel-type converter that the present invention adopts comprises two Cuk circuit units, its input side joint dividing potential drop condenser network, its output side joint output filter capacitor and load circuit.First switching tube and second switch pipe are not worked simultaneously in this circuit, work in first sinusoidal wave cycle and second cycle respectively, and therefore, these two switching tubes need not be provided with Dead Time, and can realize high-frequency inversion.Freewheel current flows through from power diode, and no switching device body diode reverse is recovered problem.This inverter increased by two half periods often open (closing) switching tube (S3, S4) and two power diodes (D5 D6) forms single-way switch, is used to select by the Cuk circuit one or the power supply of two pairs of loads of Cuk circuit.These two switching tubes are operated under the half cycle conduction mode, and how many therefore whole on-state loss do not increase.Controlling schemes is also simpler: adopt the method for monocycle control, make inverter not need bias current when operate as normal, inductive current is operated under the continuous mode, reduced EMI.It is fast that monocycle control also has dynamic response, suppresses power-supply fluctuation, realizes characteristics such as simple.The value of inductance L 1, L2 and L3 can be bigger, and the current ripples of the inductance of flowing through is less, and circuit can be exported bigger power.Because outlet side is the parallel connection type structure, can more easy structure three-phase system.
Beneficial effect: the present invention is the single-stage inverter that utilize that two Cuk converters form a kind of not only can have been boosted but also can step-down, has following advantage:
When the input side busbar voltage was higher or lower than the output AC voltage peak-to-peak value, this kind inverter still can operate as normal, has the input voltage range of broad; Adopt the method for monocycle control, the fluctuation of power supply is had stronger inhibition ability.
This comparative maturity of Cuk converter in the dc-dc conversion area research, the circuit parameter selection principle in dc-dc conversion can be transplanted in this inverter, and circuit parameter is chosen comparatively simple, is convenient to design.
Power switch pipe at high-frequency work does not have the bridge arm direct pass problem, does not therefore need to be provided with the Dead Time of these two switching tubes, the high frequencyization of the circuit that is easy to realize.
The afterflow path makes power switch pipe and power diode can distinguish optimal design by independent power diode.
Inductive current is continuous, so output only needs the filter capacitor of a low capacity just can realize sinusoidal waveform output preferably.
Description of drawings
Fig. 1 is the electrical block diagram of double-Cuk buck-boost output parallel-type converter of the present invention;
Fig. 2 is that three-phase double-Cuk buck-boost output parallel-type converter of the present invention makes up schematic diagram;
Fig. 3-the 6th, each switch mode schematic diagram of double-Cuk buck-boost output parallel-type converter of the present invention;
Fig. 7 is the drive waveforms schematic diagram of the power switch pipe of double-Cuk buck-boost output parallel-type converter of the present invention;
Fig. 8 is each inductive current and the output voltage waveform of double-Cuk buck-boost output parallel-type converter of the present invention;
Fig. 9 is the control chart that double-Cuk buck-boost output parallel-type converter of the present invention adopts;
Figure 10 is the given waveform of double-Cuk buck-boost output parallel-type converter employing of the present invention and the drive waveforms of third and fourth power switch pipe.
Main designation in the above-mentioned accompanying drawing: 1. capacitance partial pressure circuit; 2. a Cuk circuit; 3. the 2nd Cuk circuit; 4. output filter circuit and load; C1~C2---the big electric capacity of input side dividing potential drop.Cf---output filter capacitor.C3~C4---Cuk converter electric capacity.D1~D6---power diode.L1~L3---linear inductance.S1~S4---power switch pipe.2Ud---inverter input voltage is the DC side busbar voltage.The electric current of iL1---inductance L 1.The electric current of iL2---inductance L 2.The electric current of iL3---inductance L 3.R---load impedance.Vref1---a Cuk converter Cycle Control given.Vref2---the 2nd Cuk converter Cycle Control given.Rint---integrating circuit resistance.Cint---integrating circuit electric capacity.
Embodiment
As shown in Figure 1, the double-Cuk buck-boost output parallel-type converter of the present embodiment, comprise capacitance partial pressure circuit 1, a Cuk circuit 2 and the 2nd Cuk circuit 3, capacitance partial pressure circuit 1 is made of two first capacitor C 1 that are in series and second capacitor C 2, a connecting to neutral potential point that is connected in series of first capacitor C 1 and second capacitor C 2, first capacitor C, 1 another termination external power supply apart from the utmost point, the negative pole of second capacitor C, 2 another termination external power supplys; In the one Cuk circuit 2, the anode of the first power diode D1 connects positive source, negative electrode connects an end of first inductance L 1, one end of the anode S1 of another termination first power switch pipe and the 3rd capacitor C 3, the negative electrode connecting to neutral potential point of first power switch tube S 1, the anode of another termination the 3rd power diode D3 of the 3rd capacitor C 3 and the negative electrode of the 3rd power switch tube S 3, the negative electrode connecting to neutral potential point of the 3rd power diode D3, the anode of the 3rd power switch pipe connects the negative electrode of the 5th power diode D5, and the anode of the 5th power diode D5 connects an end of the 3rd inductance L 3; In the 2nd Cuk circuit 3, the negative electrode of the second power diode D2 connects power cathode, anode connects an end of second inductance L 2, the negative electrode of another termination second power switch tube S 2 of second inductance and an end of the 4th capacitor C 4, the anode connecting to neutral potential point of second power switch tube S 2, the negative electrode of another termination the 4th power diode D4 of the 4th capacitor C 4 and the anode of the 4th power switch tube S 4, the anode connecting to neutral potential point of the 4th power diode D4, the negative electrode of the 4th power switch tube S 4 connects the anode of the 6th power diode D6, the negative electrode of the 6th power diode D6 connects the 3rd inductance L 3, a Cuk circuit 2 is the same together, is connected to the same end of the 3rd inductance; Load 4 one is terminated at the other end of the 3rd inductance L 3, the other end connecting to neutral potential point of load 4.
Double-Cuk buck-boost type output parallel-type converter is at the minus negative half period of output current, and a Cuk circuit 2 is worked, and the 2nd Cuk circuit 3 is not worked, and power switch tube S 4 is turn-offed power switch tube S 3 closures.This moment, circuit comprised two operation modes:
Operation mode I
As shown in Figure 3, power switch tube S 1 and S3 closure, S2 and S4 turn-off, and power supply charges to L1, and the current i L1 of L1 is linear to rise, and capacitor C 3 is crossed L3 by load flow, and the current i L3 of L3 oppositely rises.Sustained diode 3 is ended.
Operation mode II
As shown in Figure 4, power switch tube S 1, S2, S4 turn-off, the S3 closure, and iL1 charges to C3, and from the D3 afterflow, iL3 flows through load from the D3 afterflow.
Greater than zero positive half cycle, the 2nd Cuk circuit 3 is worked at output current, and a Cuk circuit 2 is not worked, and power switch tube S 3 keeps turn-offing, and the S4 standard-sized sheet is logical.This moment, circuit also comprised two operation modes:
Operation mode III
As shown in Figure 5, power switch tube S 2 and S4 are open-minded, and S1 and S3 turn-off, and electric current flows through L2 and returns power cathode, and iL2 is linear to rise, and C4 forms closed circuit by L3 and load, and the current i L3 forward of L3 rises.Sustained diode 4 is ended.
Operation mode IV
As shown in Figure 6, power switch tube S 1, S2, S3 turn-off, and S4 is open-minded, and electric current flows through D4, C4, and L2 returns power cathode, and the current i L2 of L2 is linear to descend, and iL3 is by D4 afterflow conducting, powering load.
More than four operation mode free lists 1 represent, the circuit key waveforms as shown in Figure 8, i.e. two positions that 2,3 work of Cuk circuit are switched at output current zero passage place, two Cuk circuit 2,3 alternations are to keep output voltage waveforms.
The power tube switch combination state of table 1 pair Cuk output parallel-type converter
iL3 S1 S2 S3 S4 D3 D4 Respective figure
<0 1 0 1 0 0 0 Fig. 3
<0 0 0 1 0 1 0 Fig. 4
>0 0 1 0 1 0 0 Fig. 5
>0 0 0 0 1 0 1 Fig. 6
For realizing above operation principle, adopt controlling schemes as shown in Figure 9: this paper is Cycle Control for what realize the invert function employing, the voltage of choosing diode D3 and D4 two ends is as feedback voltage, behind integration, compare with given voltage, the shutoff of decision S1 and S2 constantly, in addition, opening of S1 and S2 triggered by clock circuit constantly.The given of Cycle Control can not be given direct voltage source, and is given as zero should for the positive half cycle of half sine wave, other half period, and the sinusoidal positive half cycle phase place of two given sides should differ 180 °.And the drive waveforms of switching tube S3 and S4 should be followed two given sides, keeps the Chang Kaichang of half sine wave period to close, and is complementary mutually, and the drive waveforms of two given waveforms and S3, S4 as shown in Figure 10.The effect of control makes the output current benchmark greater than zero the time, and switching tube S4 often opens, and S1, S3 turn-off, and S2 modulates work; At the minus negative half period of current reference, switching tube S3 often opens, and S2, S4 turn-off, and S1 modulates work.

Claims (5)

1. a double-Cuk buck-boost output parallel-type converter is characterized in that, comprises capacitance partial pressure circuit (1), a Cuk circuit (2) and the 2nd Cuk circuit (3); Capacitance partial pressure circuit (1) is made of two first electric capacity (C1) that are in series and second electric capacity (C2), a connecting to neutral potential point N that is connected in series of first electric capacity (C1) and second electric capacity (C2), the positive pole of another termination external power supply of first electric capacity (C1) 2Ud, the negative pole of another termination external power supply of second electric capacity (C2) 2Ud; In the one Cuk circuit (2), the anode of first power diode (D1) connects the positive pole of power supply 2Ud, negative electrode connects an end of first inductance (L1), the anode (S1) of another termination first power switch pipe of first inductance (L1) and an end of the 3rd electric capacity (C3), the negative electrode connecting to neutral potential point N of first power switch pipe (S1), the anode of another termination the 3rd power diode (D3) of the 3rd electric capacity (C3) and the negative electrode of the 3rd power switch pipe (S3), the negative electrode connecting to neutral potential point N of the 3rd power diode (D3), the anode of the 3rd power switch pipe (S3) connects the negative electrode of the 5th power diode (D5), and the anode of the 5th power diode (D5) connects an end of the 3rd inductance (L3); In the 2nd Cuk circuit (3), the negative electrode of second power diode (D2) connects the negative pole of power supply 2Ud, the anode of second power diode (D2) connects an end of second inductance (L2), the negative electrode of another termination second power switch pipe (S2) of second inductance (L2) and an end of the 4th electric capacity (C4), the anode connecting to neutral potential point N of second power switch pipe (S2), the negative electrode of another termination the 4th power diode (D4) of the 4th electric capacity (C4) and the anode of the 4th power switch pipe (S4), the anode connecting to neutral potential point of the 4th power diode (D4), the negative electrode of the 4th power switch pipe (S4) connects the anode of the 6th power diode (D6), the negative electrode of the 6th power diode (D6) connects the 3rd inductance (L3), a Cuk circuit (2) is the same together, is connected to the same end of the 3rd inductance (L3); Load (4) one is terminated at the other end of inductance (L3), the other end connecting to neutral potential point N of load (4).
2. double-Cuk buck-boost output parallel-type converter as claimed in claim 1 is characterized in that, first inductance (L1), and second inductance (L2) and the 3rd inductance (L3) are coupling on the same secondary magnetic core.
3. double-Cuk buck-boost output parallel-type converter as claimed in claim 1 is characterized in that, can make up three-phase system with three double-Cuk buck-boost output parallel-type converters, and same power supply and capacitance partial pressure circuit is used in input.
4. double-Cuk buck-boost output parallel-type converter as claimed in claim 1 is characterized in that, external power supply 2Ud is the power supply that can fluctuate, and it can be lower than the output AC voltage peak-to-peak value.
5. double-Cuk buck-boost output parallel-type converter as claimed in claim 1, it is characterized in that first, second, third, fourth power switch pipe can be the power switch pipe of inverse parallel diode in the belt body, also can be the power switch pipe of external inverse parallel diode.
CN2010102011727A 2010-06-11 2010-06-11 Double-Cuk buck-boost output parallel-type converter Expired - Fee Related CN101895223B (en)

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Cited By (12)

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Publication number Priority date Publication date Assignee Title
CN102223058A (en) * 2011-06-03 2011-10-19 浙江源创电子科技有限公司 Interlaced on-line isolated double-cuk circuit
CN102651619A (en) * 2011-02-28 2012-08-29 浙江源创电子科技有限公司 On-line isolated Cuk circuit
CN103066873A (en) * 2013-01-21 2013-04-24 福州大学 Novel voltage reduction type bridgeless Cuk power factor correction (PFC) circuit
CN104333246A (en) * 2014-11-28 2015-02-04 南京工业大学 Cuk-Sepic single-stage inverter
CN105356740A (en) * 2015-11-27 2016-02-24 黄敏超 Electric energy converter with electromagnetic interference suppression structure
CN105429502A (en) * 2015-11-20 2016-03-23 燕山大学 Single-stage non-isolated double-Cuk type inverter without electrolytic capacitor
CN105897024A (en) * 2016-05-25 2016-08-24 南通大学 Single-phase Cuk integrated boost-buck inverter and control method and control system thereof
CN106385173A (en) * 2016-11-30 2017-02-08 福州大学 Three-path forward voltage output single-stage bridgeless CukPFC converter and control method thereof
CN106452144A (en) * 2016-11-03 2017-02-22 燕山大学 Buck-boost tri-level inverter based on Zeta
CN104601025B (en) * 2015-01-15 2017-04-12 燕山大学 Three phase buck-boost type three level inverter
CN107888104A (en) * 2017-11-21 2018-04-06 燕山大学 A kind of non-isolated three-phase Cuk inverters of monopole
CN109639173A (en) * 2018-12-18 2019-04-16 中国石油大学(华东) The double CUK bucks of modularization export the combined inverter of inverse parallel

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102651619A (en) * 2011-02-28 2012-08-29 浙江源创电子科技有限公司 On-line isolated Cuk circuit
CN102223058A (en) * 2011-06-03 2011-10-19 浙江源创电子科技有限公司 Interlaced on-line isolated double-cuk circuit
CN102223058B (en) * 2011-06-03 2014-02-12 浙江源创电子科技有限公司 Interlaced on-line isolated double-cuk circuit
CN103066873A (en) * 2013-01-21 2013-04-24 福州大学 Novel voltage reduction type bridgeless Cuk power factor correction (PFC) circuit
CN104333246A (en) * 2014-11-28 2015-02-04 南京工业大学 Cuk-Sepic single-stage inverter
CN104601025B (en) * 2015-01-15 2017-04-12 燕山大学 Three phase buck-boost type three level inverter
CN105429502A (en) * 2015-11-20 2016-03-23 燕山大学 Single-stage non-isolated double-Cuk type inverter without electrolytic capacitor
CN105429502B (en) * 2015-11-20 2017-11-24 燕山大学 The double Cuk type inverters of the non-isolated no electrolytic capacitor of single-stage
CN105356740A (en) * 2015-11-27 2016-02-24 黄敏超 Electric energy converter with electromagnetic interference suppression structure
CN105897024A (en) * 2016-05-25 2016-08-24 南通大学 Single-phase Cuk integrated boost-buck inverter and control method and control system thereof
CN106452144B (en) * 2016-11-03 2019-02-01 燕山大学 A kind of buck-boost type three-level inverter based on Zeta
CN106452144A (en) * 2016-11-03 2017-02-22 燕山大学 Buck-boost tri-level inverter based on Zeta
CN106385173A (en) * 2016-11-30 2017-02-08 福州大学 Three-path forward voltage output single-stage bridgeless CukPFC converter and control method thereof
CN106385173B (en) * 2016-11-30 2019-03-12 福州大学 Three road forward voltages export single-stage without bridge CukPFC converter and its control method
CN107888104A (en) * 2017-11-21 2018-04-06 燕山大学 A kind of non-isolated three-phase Cuk inverters of monopole
CN109639173A (en) * 2018-12-18 2019-04-16 中国石油大学(华东) The double CUK bucks of modularization export the combined inverter of inverse parallel

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