CN103457506B - A kind of wide input single-stage two-way buck-boost inverter - Google Patents
A kind of wide input single-stage two-way buck-boost inverter Download PDFInfo
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Abstract
The invention discloses a kind of wide input single-stage two-way buck-boost inverter, including inverter bridge, coupling inductance, switch element, output filter unit；Described inverter bridge includes the first brachium pontis, the second brachium pontis；Described switch element includes the first switch element, second switch unit；Described first switch element, second switch unit include the first end, the second end respectively；Described output filter unit includes filter capacitor；Described coupling inductance includes the first winding, the second winding, determines output voltage gain by the turn ratio arranging the second winding and the first winding.In the case of identical voltage gain, the dutycycle of the most single inductive circuit of dutycycle of switching tube of the present invention is little, and i.e. two circuit are in the case of identical dutycycle, and the voltage gain of circuit of the present invention is higher.It is prevented effectively from the problem that diode reverse recovery brings, reduces switching loss, extend the service life of switching tube.
Description
Technical field
The present invention relates to a kind of wide input single-stage two-way buck-boost inverter, belong to the technical field of converters.
Background technology
Inverter is widely used in motor and drives, uninterruption power source, sensing heating, static state reactive generator and compensator with
And the occasion such as active power filtering.Traditional inverter circuit topology includes voltage source inverter and current source inverter two class.
The output AC voltage of voltage source inverter is less than DC bus-bar voltage, and therefore voltage source inverter is substantially a blood pressure lowering
Type inverter, in order to realize the function of boosting inverter, needs extra increase first class boost translation circuit, causes changer entirety to be tied
Structure is complicated.
Current source inverter is substantially a booster type inverter, in order to realize the function of decompression transformation, needs extra increase by
Level step-down conversion circuit, causes changer complicated integral structure；Current source inverter can only realize unidirectional power transfer, and energy is not
Can two-way flow.
In order to solve voltage source inverter and the problems referred to above of current source inverter existence, scholar proposes the concept of Z-source inverter,
By introducing a Z source network, converter main circuit is coupled together with power supply.Compared with voltage source and current source inverter, Z
Source inventer can provide the function that buck converts, but can not realize the transmitted in both directions of energy equally, has been simultaneously introduced extra
By inductance, the passive element of electric capacity composition, add the volume of system, weight and realize cost, control complexity simultaneously.Domestic
The outer Z-source inverter circuit proposing some remodeling the most successively, its essence is all real by introducing passive element
Now boost, all there are the problems referred to above.
China national Department of Intellectual Property, Application No.: 201310020215.5, patent name is " single-stage two-way buck inversion
Device " patent document, disclose the single-stage two-way buck-boost inverter that a kind of input filter unit is single filter inductance, this is inverse
Change device efficiently solves conventional inverter and uses passive element to realize some problems that boosting produces.
But single-stage two-way buck-boost inverter disclosed in this patent still suffers from problems with:
(1) boost capability is limited, i.e. step-up ratio is low, and some application scenario needs circuit to have the highest step-up ratio, and only has
The circuit of one inductance, when realizing high step-up ratio, needs switching tube to drive the dutycycle of signal very greatly, can deteriorate diode anti-
The problem brought to recovery, adds switching loss.
(2) too high dutycycle, can strengthen the ripple of inductance, reduces system effectiveness.
Therefore, these problems are solved most important to promoting inverter performance.
Summary of the invention
The technical problem to be solved is: provides a kind of wide input single-stage two-way buck-boost inverter, solves existing skill
Inverter in art obtains the problem that high-gain needs high duty ratio.
The present invention solves above-mentioned technical problem, adopt the following technical scheme that
A kind of wide input single-stage two-way buck-boost inverter, including inverter bridge, inductance, switch element, output filter unit；Institute
State inverter bridge and include the first brachium pontis, the second brachium pontis；Described switch element includes the first switch element, second switch unit；Described
First switch element, second switch unit include the first end, the second end respectively；Described output filter unit includes filter capacitor；
Second end of described first switch element is connected with the midpoint of described second brachium pontis, and the second end of described first switch element and institute
State connection filter capacitor between the second end of second switch unit；Described inductance is coupling inductance, and described coupling inductance includes first
Winding, the second winding, the Same Name of Ends of described first winding is connected with the midpoint of described first brachium pontis；The different name of described first winding
End is connected with the first end, the Same Name of Ends of the second winding of described first switch element respectively；The different name end of described second winding and
First end of two switch elements connects, and determines output voltage gain by the turn ratio arranging the second winding and the first winding.
The midpoint of described first brachium pontis is connected with the different name end of described first winding；The Same Name of Ends of described first winding is respectively with described
The Same Name of Ends of the second winding, the first end of second switch unit connect；The different name end of described second winding is single with described first switch
First end of unit connects.
The midpoint of described first brachium pontis is connected with Same Name of Ends, the Same Name of Ends of the second winding of described first winding respectively；Described first
The different name end of winding is connected with the first end of described first switch element；The different name end of described second winding and described second switch list
First end of unit connects.
Compared with prior art, there is advantages that
In the case of identical voltage gain, the dutycycle of the most single inductive circuit of dutycycle of switching tube of the present invention is little, i.e.
Two circuit are in the case of same duty cycle, and the voltage gain of circuit of the present invention is higher.Diode reverse can be prevented effectively from extensive
The problem brought again, reduces switching loss, extends the service life of switching tube.
Dutycycle is little, and the inductance ripple of generation is little, improves system work efficiency simultaneously.
Accompanying drawing explanation
Fig. 1 is the block diagram of prior art width input single-stage two-way buck-boost inverter.
Fig. 2 is the circuit diagram of the specific embodiment of the invention 1.
Fig. 3 is that the specific embodiment of the invention 1 is at input voltage Vi=50V, pressure rise test oscillogram during AC load 500W.
Fig. 4 is that the specific embodiment of the invention 1 is at input voltage Vi=200V, blood pressure lowering experimental waveform figure during AC load 500W.
Fig. 5 is the circuit diagram of the specific embodiment of the invention 2.
Fig. 6 is the circuit diagram of the specific embodiment of the invention 3.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described in detail:
Wide input single-stage two-way buck-boost inverter of the present invention, including inverter bridge, coupling inductance, switch element, output
Filter unit；Described inverter bridge includes the first brachium pontis, the second brachium pontis；Described switch element includes the first switch element, second opens
Close unit；Described first switch element, second switch unit include the first end, the second end respectively；Described first switch element,
Second switch unit is complementary bidirectional power electronic switch；Described output filter unit includes filter capacitor；Described coupling inductance
Including the first winding L1, the second winding L2, determine output voltage by the turn ratio arranging the second winding L2 and the first winding L1
Gain.
First brachium pontis of described inverter bridge includes switching tube Q5, switching tube Q7, the second brachium pontis includes switching tube Q6, switching tube Q8；
Described first switch element includes that switching tube Q1, switching tube Q2, described second switch unit include switching tube Q3, switching tube
Q4。
Described switching tube includes IGBT pipe and diode, and the colelctor electrode of described IGBT pipe is connected conduct with the negative electrode of described diode
The input of switching tube, the emitter stage of described IGBT is connected the outfan as switching tube with the anode of described diode；Switch
The outfan of pipe Q1 is connected with the outfan of switching tube Q2, the input of switching tube Q1 as the first end of the first switch element,
The input of switching tube Q2 is as the second end of the first switch element；The input of switching tube Q3 and the input of switching tube Q4
Connecting, the outfan of switching tube Q3 is as the first end of second switch unit, and the outfan of switching tube Q4 is as the first switch
Second end of unit.
The available metal-oxide-semiconductor of described IGBT pipe, audion are replaced, and replace principle as follows: the drain electrode of described metal-oxide-semiconductor, audion
The colelctor electrode of the corresponding described IGBT pipe of colelctor electrode connect, the source electrode of described metal-oxide-semiconductor, audion emitter stage correspondence described in
The emitter stage of IGBT connects.
Width of the present invention input single-stage two-way buck-boost inverter physical circuit figure and operation principle are as follows:
Specific embodiment 1: wide input single-stage two-way buck-boost inverter (1).
Wide input single-stage two-way buck-boost inverter as shown in Figure 2, including inverter bridge, coupling inductance, the first switch element,
Second switch unit, filter capacitor C；The input of described inverter bridge connects DC source E；Described first winding L1's is of the same name
End is connected with the midpoint of inverter bridge the first brachium pontis；The different name end of described first winding L1 respectively with the of described first switch element
One end, the Same Name of Ends of the second winding L2 connect；The described different name end of the second winding L2 is connected with the first end of second switch unit；
Second end of described first switch element is connected with the midpoint of described second brachium pontis, and the second end of described first switch element and institute
State connection filter capacitor C between the second end of second switch unit；AC load R is connected in parallel with filter capacitor C；By setting
The turn ratio putting the second winding L2 and the first winding L1 determines output voltage gain.
The control strategy of the present embodiment and operation principle be:
The switching tube Q of inverter bridge5、Q6、Q7、Q8Use SPWM modulation strategy；Two groups of complementary bidirectional power electronic switch are adopted
Use complementary duty cycle control strategy.The concrete on-off mode of switching tube Q1, Q2, Q3, Q4 is: with a working cycle be
Example, when inverter bridge output alternating voltage polarity be timing, control switching tube Q2, Q4 normal open, switching tube Q1, Q3 with
Dead Time complementation break-make；When the alternating voltage polarity of inverter bridge output is for time negative, control switching tube Q1, Q3 normal open, switch
Pipe Q2, Q4 are with Dead Time complementation break-make.By above-mentioned control mode, the first complementary bidirectional power electronic cutting can be realized
Nature commutation between pass, the second complementary bidirectional power electronic switch so that switch can take over seamlessly.
According to input voltage and the value of output voltage, preset the dutycycle of switch element, determine the second winding L2 and first around
The turn ratio of group L1, then according to the deviation of output voltage gain Yu ideal voltage gain, regulates the dutycycle of switch element in real time,
Make output voltage gain identical with ideal voltage gain, and keep constant output voltage gain.
The present embodiment beneficial effect compared with prior art is analyzed: boost process oscillogram such as Fig. 3 of the present invention by Fig. 3, Fig. 4
Shown in, input voltage Vi=50V, AC load is 500W, and dutycycle during switching tube Q1 high-frequency work is 0.45～0.55
Between change.The turn ratio is: 1, and in figure, waveform is respectively voltage u on input voltage Vi, filter capacitorc, switching tube Q1 drive
The electric current i flow through in voltage and the first windingL1Waveform, the voltage on filter capacitor is output voltage.It can be seen that filter in figure
Voltage u on ripple electric capacitycVirtual value be about 110V, peak value is 155V, and relative to input voltage, gain has reached 3 times.
If the dutycycle of Q1 is always maintained at 0.55 in prior art, not considering the pressure drop of circuit loss and switching tube, it is theoretical
Gain only has 2.2, will reach the gain of 3 times, and dutycycle during Q1 high-frequency work should be 0.67 in theory.Damage in view of circuit
Consumption, its dutycycle may be more than 0.7.Obviously, width of the present invention input single-stage two-way buck-boost inverter is identical in dutycycle
In the case of, voltage gain relatively prior art wants big.Achieve the boost function of high-gain.
Pressure reduction waveform of the present invention as shown in Figure 4, for input voltage Vi=200V, input voltage when AC load is 500W
Voltage u on Vi, filter capacitorc, the electric current i that flows through in switching tube Q2 driving voltage and the first windingL1Waveform, now in figure
vCVirtual value be about 110V, inverter achieves buck functionality, can only one-way transmission power compared to current source inverter
Shortcoming, wide input single-stage two-way buck-boost inverter not only achieves reduced output voltage without step-down conversion circuit, simultaneously can be two-way
Transmission energy, has higher voltage gain than traditional Boost circuit.Visible, wide input single-stage two-way buck-boost inverter is tied
Structure achieves buck output and the transmitted in both directions of energy of inverter simply.
Specific embodiment 2, wide input single-stage two-way buck-boost inverter (2).
Wide input single-stage two-way buck-boost inverter as shown in Figure 5, including inverter bridge, coupling inductance, the first switch element,
Second switch unit, filter capacitor C；The input of described inverter bridge connects DC source E；The midpoint of described first brachium pontis with
The different name end of described first winding L1 connects；The Same Name of Ends of described first winding L1 of the same name with described second winding L2 respectively
End, the first end of second switch unit connect；The different name end of described second winding L2 and the first end of described first switch element
Connect；Second end of described first switch element is connected with the midpoint of described second brachium pontis, and the second of described first switch element
It is connected filter capacitor C between end and the second end of described second switch unit；AC load R is connected in parallel with filter capacitor C.
The control strategy of the present embodiment and operation principle be:
The switching tube Q of inverter bridge5、Q6、Q7、Q8Use SPWM modulation strategy；Two groups of complementary bidirectional power electronic switch use
Complementary duty cycle control strategy.The concrete on-off mode of switching tube Q1, Q2, Q3, Q4 is: when the alternating voltage pole of output
Property is timing, and switching tube Q2, Q4 normal open, switching tube Q1, Q3 are with Dead Time complementation break-make；Alternating current when output
Pressure polarity is for time negative, and switching tube Q1, Q3 normal open, switching tube Q2, Q4 are with Dead Time complementation break-make.By this control
Mode processed, can realize the nature commutation between the first complementary bidirectional power electronic switch, the second complementary bidirectional power electronic switch,
Switch can be taken over seamlessly.
Specific embodiment 3, wide input single-stage two-way buck-boost inverter (3).
Wide input single-stage two-way buck-boost inverter as shown in Figure 6, including inverter bridge, coupling inductance, the first switch element,
Second switch unit, filter capacitor C；The input of described inverter bridge connects DC source E；The midpoint of described first brachium pontis is divided
It is not connected with Same Name of Ends, the Same Name of Ends of the second winding L2 of described first winding L1；The different name end of described first winding L1 with
First end of described first switch element connects；The different name end of described second winding L2 and the first end of described second switch unit
Connect；Second end of described first switch element is connected with the midpoint of described second brachium pontis, and the second of described first switch element
It is connected filter capacitor C between end and the second end of described second switch unit；AC load R is connected in parallel with filter capacitor C.
The control strategy of the present embodiment and operation principle be:
The switching tube Q of inverter bridge5、Q6、Q7、Q8Use SPWM modulation strategy；Two groups of complementary bidirectional power electronic switch use
Complementary duty cycle control strategy.The concrete on-off mode of switching tube Q1, Q2, Q3, Q4 is: when the alternating voltage pole of output
Property is timing, and switching tube Q2, Q4 normal open, switching tube Q1, Q3 are with Dead Time complementation break-make；Alternating current when output
Pressure polarity is for time negative, and switching tube Q1, Q3 normal open, switching tube Q2, Q4 are with Dead Time complementation break-make.By this control
Mode processed, can realize the nature commutation between the first complementary bidirectional power electronic switch, the second complementary bidirectional power electronic switch,
Switch can be taken over seamlessly.
In sum: when input voltage is higher than output voltage, need to realize blood pressure lowering inversion, the first complementary bidirectional power electronic cutting
Pass is off state, and the second complementary bidirectional power electronic switch is in opening state, and now circuit equivalent is that conventional voltage source is inverse
Become device, it is achieved blood pressure lowering inversion function；When the input voltage is lower than the output voltage, needing to realize boosting inversion, first is complementary two-way
Electronic power switch and the second complementary bidirectional power electronic switch are in complementary switch state, by regulating the first complementary bidirectional power
Electrical switch operative duty cycles realizes the regulation of voltage gain, thus realizes inversion function of boosting.
Wide input single-stage two-way buck-boost inverter involved in the present invention can realize the boosting of high-gain without boost conversion circuit
Output；Transmitted in both directions energy while reduced output voltage is achieved without step-down conversion circuit.
Claims (3)
1. a wide input single-stage two-way buck-boost inverter, including inverter bridge, inductance, switch element, output filter unit；Described inverter bridge includes the first brachium pontis, the second brachium pontis；Described switch element includes the first switch element, second switch unit；Described first switch element, second switch unit include the first end, the second end respectively；Described output filter unit includes filter capacitor；Second end of described first switch element is connected with the midpoint of described second brachium pontis, and is connected filter capacitor between the second end of described first switch element and the second end of described second switch unit；It is characterized in that: described inductance is coupling inductance, described coupling inductance includes that the first winding, the second winding, the Same Name of Ends of described first winding are connected with the midpoint of described first brachium pontis；The different name end of described first winding is connected with the first end, the Same Name of Ends of the second winding of described first switch element respectively；The different name end of described second winding is connected with the first end of second switch unit, determines output voltage gain by the turn ratio arranging the second winding and the first winding.
Wide input single-stage two-way buck-boost inverter the most according to claim 1, it is characterised in that: the midpoint of described first brachium pontis is connected with the different name end of described first winding；The Same Name of Ends of described first winding is connected with the Same Name of Ends of described second winding, the first end of second switch unit respectively；The different name end of described second winding is connected with the first end of described first switch element.
Wide input single-stage two-way buck-boost inverter the most according to claim 1, it is characterised in that: the midpoint of described first brachium pontis is connected with Same Name of Ends, the Same Name of Ends of the second winding of described first winding respectively；The different name end of described first winding is connected with the first end of described first switch element；The different name end of described second winding is connected with the first end of described second switch unit.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141165A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Vehicle power supply inverter |
| CN105141160A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Vehicle-mounted power supply photovoltaic inverter |
| CN105141157A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Single-stage vehicle-mounted power supply inverter capable of boosting voltage and reducing voltage |
| CN105141161A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Control method of single-stage boost-buck vehicle power supply inverter |
| CN105141166A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Control method for vehicle-mounted power inverter |
| CN105048848A (en) * | 2015-08-27 | 2015-11-11 | 无锡伊佩克科技有限公司 | Output driving circuit of vehicle-mounted power supply inverter |
| CN105048853A (en) * | 2015-08-27 | 2015-11-11 | 无锡伊佩克科技有限公司 | Control method for photocoupling isolated vehicle-mounted power supply inverter |
| CN105048840A (en) * | 2015-08-27 | 2015-11-11 | 无锡伊佩克科技有限公司 | Optocoupler-isolation single-stage boost-buck vehicle power supply inverter |
| CN105048849A (en) * | 2015-08-27 | 2015-11-11 | 无锡伊佩克科技有限公司 | Optocoupler-isolation vehicle power supply inverter |
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| JP2002247865A (en) * | 2001-02-19 | 2002-08-30 | Kawamura Electric Inc | Ac chopper |
| CN103078548A (en) * | 2013-01-21 | 2013-05-01 | 南京航空航天大学 | Single-stage bidirectional buck-boost inverter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002247865A (en) * | 2001-02-19 | 2002-08-30 | Kawamura Electric Inc | Ac chopper |
| CN103078548A (en) * | 2013-01-21 | 2013-05-01 | 南京航空航天大学 | Single-stage bidirectional buck-boost inverter |
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| 《改进单周期控制策略的双向大变比DC-DC开关变换器》;林维明等;《中国电机工程学报》;20120725;第32卷(第21期);31-37 * |
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