CN106655852A - Three-level inverter - Google Patents
Three-level inverter Download PDFInfo
- Publication number
- CN106655852A CN106655852A CN201710165190.6A CN201710165190A CN106655852A CN 106655852 A CN106655852 A CN 106655852A CN 201710165190 A CN201710165190 A CN 201710165190A CN 106655852 A CN106655852 A CN 106655852A
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- China
- Prior art keywords
- node
- diode
- switching tube
- switch tube
- switch pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a three-level inverter, and relates to the field of power electronic technology. The three-level inverter has the advantages of high switching speed, small loss, high efficiency, fast heat dissipation and the like. The three-level inverter comprises: a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, which are connected in series, wherein the first switch tube and the fourth switch tube are bipolar transistors, the second switch tube and the fourth switch tube are field effect transistors; a first diode, wherein the cathode of the first diode is connected with the drain electrode of the first switch tube, and the anode of the first diode is connected with the source electrode of the first switch tube; a second diode, wherein the cathode of the second diode is connected with the drain electrode of the fourth switch tube, and the anode of the second diode is connected with the source electrode of the fourth switch tube; a fifth diode, wherein the cathode of the fifth diode is connected with a second node; a sixth diode, wherein the anode of the sixth diode is connected with a sixth node, and the cathode of the sixth diode is connected with a fourth node; a second diode connected between a first node and a second node, a second diode connected between the first node and the fourth node, and a filtering unit connected between the second node and the third node; and a fifth switch tube connected between the second node and the fourth node.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly to a kind of three-level inverter.
Background technology
Three-level inverter is pulsewidth modulation (PWM) circuit based on three fixed levels, wide in field of power electronics
General application.At present, as shown in figure 1, adopting insulated gate bipolar transistor in most widely used three-level inverter
(IGBT) as four switching tubes Q1, Q2, Q3, Q4, but the shortcoming of IGBT is that switching speed is slow, it is big to be lost, therefore PWM is switched
The raising of frequency is restricted.As shown in Fig. 2 the three-level inverter for also having some manufacturers in addition is imitated using metal oxide field
Transistor (MOSFET) is answered as four switching tubes Q1, Q2, Q3, Q4, but it is reverse extensive due to MOSFET endophyte diodes
Multiple characteristic is excessively poor, when electric current passes through parasitic diode afterflow, can cause the electrical problems of correlation, so affect product can
By property.And in both modal neutral point clamp (NPC) three-level inverters, due to the unilateral conduction of diode,
Afterflow can only be carried out by the loop therein corresponding to diode D1 or D2, so as to the loss of circuit is larger, efficiency compared with
It is low and be unfavorable for radiating.
The content of the invention
For above-mentioned deficiency of the prior art, embodiments of the invention provide a kind of three-level inverter, realize out
Pass speed is fast, it is little to be lost, improve efficiency and beneficial to radiating, and avoids the Reverse recovery of MOSFET endophyte diodes
Related electric problem caused by characteristic difference.
To solve above-mentioned technical problem, embodiments of the invention are adopted the following technical scheme that：
A kind of three-level inverter, including：First DC source；Second DC source, the negative pole of its positive pole and first DC source
Connection is used as first node；First switch pipe, the first switch pipe is bipolar transistor, and its colelctor electrode is straight with described first
The positive pole in stream source connects as Section Point；Second switch pipe, the second switch pipe is field-effect transistor, and it drains and institute
The emitter stage for stating first switch pipe connects as the 3rd node；3rd switching tube, the 3rd switching tube is field-effect transistor,
Its drain electrode is connected as fourth node with the emitter stage of the second switch pipe；4th switching tube, the 4th switching tube is double
Polar transistor, its colelctor electrode is connected as the 5th node with the emitter stage of the 3rd switching tube, its source electrode and described second
The negative pole of DC source connects as the 6th node；First diode, its negative electrode is connected to the colelctor electrode of the first switch pipe, its
Anode is connected to the emitter stage of the first switch pipe；Second diode, its negative electrode is connected to the current collection of the 4th switching tube
Pole, its anode is connected to the emitter stage of the 4th switching tube；3rd diode, its anode is connected to the first node, its
Negative electrode is connected to the 3rd node；4th diode, its anode is connected to the 5th node, and its negative electrode is connected to described
One node；5th diode, its anode is connected to the fourth node, and its negative electrode is connected to the Section Point；Six or two pole
Pipe, its anode is connected to the 6th node, and its negative electrode is connected to the fourth node；5th switching tube is connected to Section Point
Between fourth node；Filter unit, the two ends of the filter unit are connected to the first node and fourth node.
Three-level inverter provided in an embodiment of the present invention, by output voltage the process of the voltage in first node is clamped
In, when the 3rd node output current is positive current, actual current is identical with the direction of output current, i.e. actual current is from first
Node flows successively through the first diode, the 5th switching tube and the 3rd switching tube the 3rd node of arrival and carries out afterflow, and while real
Border electric current can carry out afterflow to flow successively through the first diode and second switch pipe the 3rd node of arrival from first node, so as to
The 3rd node is set to export the voltage of first node, due to having two continuous current circuits, i.e. second switch pipe and the 3rd for being serially connected
Switching tube and the 5th paralleled power switches carry out afterflow, compared with only having wall scroll continuous current circuit in prior art, improve to switch
The utilization rate of pipe so that have more switching tubes to share electric current and loss, so as to improve the efficiency of circuit and being more beneficial for dissipating
Heat；When the 3rd node output current is negative current, actual current is in opposite direction with output current, i.e. actual current is from the 3rd
Node flows successively through second switch pipe, the 5th switching tube and the second diode arrival first node and carries out afterflow, and while real
Border electric current can carry out afterflow to flow successively through the 3rd switching tube and the second diode arrival first node from the 3rd node, so as to
The 3rd node is set to export the voltage of first node, due to having two continuous current circuits, i.e. the 3rd switching tube and second for being serially connected
Switching tube and the 5th paralleled power switches carry out afterflow, compared with only having wall scroll continuous current circuit in prior art, improve to switch
The utilization rate of pipe so that have more switching tubes to share electric current and loss, so as to improve the efficiency of circuit and being more beneficial for dissipating
Heat.
Because second switch pipe and the 3rd switching tube are field-effect transistor, even if field-effect transistors bear main
Switching loss, so as to improve switching speed, reduces switching loss, simultaneously because first switch pipe and the 4th switching tube are used
Bipolar transistor and increased the 5th diode and the 6th diode so that electric current is by posting inside field-effect transistor
Raw diode continuousing flow, so as to avoid the caused phase of reverse recovery characteristic difference due to field-effect transistor endophyte diode
Close electrical problems.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings,
Fig. 1 is a kind of schematic diagram of three-level inverter in prior art；
Fig. 2 is the schematic diagram of another kind of three-level inverter in prior art；
Fig. 3 is a kind of schematic diagram of three-level inverter in the embodiment of the present invention；
Fig. 4 be in Fig. 3 by output voltage clamp during the voltage of first node output current be positive current constantly
Schematic diagram；
Fig. 5 be in Fig. 3 by output voltage clamp during the voltage of first node output current be negative current constantly
Schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.
As shown in figure 3, a kind of three-level inverter is embodiments provided, including：First DC source BUS1, second
DC source BUS2, first switch pipe Q1, second switch pipe Q2, the 3rd switching tube Q3, the 4th switching tube Q4, the 5th switching tube Q5,
First diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6
With filter unit 1.Wherein, the positive pole of the second DC source BUS2 is connected as first node N with the negative pole of the first DC source BUS1；
First switch pipe Q1 is bipolar transistor, and its colelctor electrode is connected as Section Point A with the positive pole of the first DC source BUS1；
Second switch pipe Q2 is field-effect transistor, and its drain electrode is connected as the 3rd node B with the emitter stage of first switch pipe Q1；3rd
Switching tube Q3 is field-effect transistor, and its drain electrode is connected as fourth node O with the emitter stage of second switch pipe Q2；4th switch
Pipe Q4 is bipolar transistor, and its colelctor electrode is connected as the 5th node D with the emitter stage of the 3rd switching tube Q3, its source electrode and the
The negative pole of two DC source BUS2 connects as the 6th node E；5th switching tube Q5 is field-effect transistor, and its one end is connected to institute
The 5th node D is stated, the other end is connected to the Section Point A；First diode D1, its negative electrode is connected to first switch pipe Q1's
Colelctor electrode, its anode is connected to the emitter stage of first switch pipe Q1；Second diode D2, its negative electrode is connected to the 4th switching tube Q4
Colelctor electrode, its anode is connected to the emitter stage of the 4th switching tube Q4；3rd diode D3, its anode is connected to first node N,
Its negative electrode is connected to the 3rd node B；4th diode D4, its anode is connected to the 5th node D, and its negative electrode is connected to first
Node N；5th diode D5, its anode is connected to fourth node O, and its negative electrode is connected to Section Point A；6th diode D6,
Its anode is connected to the 6th node E, and its negative electrode is connected to fourth node O；The two ends of filter unit 1 are connected to first node
N and fourth node O；Second switch pipe Q2 and the 3rd switching tube Q3 without diode-built-in, the first diode D1 and the second diode
D2 is respectively the parasitic diode of first switch pipe Q1 and the 4th switching tube Q4.
In above-mentioned three-level inverter, the first DC source BUS1 and the second DC source BUS2 is regarded as invariable
Voltage source, output node is the 3rd node C, and neutral point clamp fly-wheel diode is the first diode D3 and the second diode D4.Three
Electrical level inverter, can be by first switch pipe Q1 and the 4th switching tube when by output voltage clamp in the voltage of first node N
Q4 is turned off, and second switch pipe Q2, the 3rd switching tube Q3 and the 5th switching tube Q5 are turned on, now the 3rd node C outputs first node N
Magnitude of voltage.Specifically, as shown in figure 4, when the 3rd node C output currents I0 are positive current, actual current I1 is electric with output
The direction of stream I0 is identical, i.e. actual current I1 flows successively through the first diode D3, the 5th switching tube Q5 and the 3rd from first node N
Switching tube Q3 reaches the 3rd node C and carries out afterflow, and while actual current I1 also flows successively through the one or two pole from first node N
Pipe D3 and second switch pipe D2 reaches the 3rd node C and carries out afterflow, so that the 3rd node C exports the voltage of first node N, by
In having two continuous current circuits, i.e. second switch pipe Q2 and the 3rd switching tube Q3 being serially connected and the 5th switching tube Q5 is in parallel carries out
Afterflow；As shown in figure 5, when the 3rd node C output currents I0 are negative current, the direction phase of actual current I2 and output current I0
Instead, i.e. actual current I2 flows successively through second switch pipe Q2, the 5th switching tube Q5 from the 3rd node C and the second diode D4 is reached
First node N carries out afterflow, and while actual current I1 also flows successively through the 3rd switching tube Q3 and second from the 3rd node C
Diode D4 reaches first node N and carries out afterflow, so that the 3rd node C exports the voltage of first node N, due to there is two to continue
To flow back to road, i.e. the 3rd switching tube Q3 in parallel with the second switch pipe Q2 and the 5th switching tube Q5 that are serially connected to carry out afterflow, and existing
There is only wall scroll continuous current circuit in technology to compare, improve the utilization rate of switch tube so that there are more switching tubes to share electricity
Stream and loss, so as to improve the efficiency of circuit and being more beneficial for radiating.It should be noted that arrow is electric current in Fig. 4 and Fig. 5
The signal in direction.
In embodiments of the present invention, a 5th extra switching tube is increase only, that is, is realized by above-mentioned three level
The output voltage of inverter is clamped in the voltage of first node, while having only single in two continuous current circuits, with prior art
Bar continuous current circuit is compared, and improves the utilization rate of switch tube so that have more switching tubes to share electric current and loss, so as to carry
The high efficiency of circuit and it is more beneficial for radiating.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can be borrowed
Software is helped to add the mode of required common hardware to realize, naturally it is also possible to which by hardware, but in many cases the former is more preferably
Embodiment.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, all should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by the scope of the claims.
Claims (4)
1. a kind of three-level inverter, it is characterised in that include：First DC source；Second DC source, its positive pole and described first
The negative pole of DC source connects as first node；First switch pipe, the first switch pipe be bipolar transistor, its colelctor electrode
It is connected as Section Point with the positive pole of first DC source；Second switch pipe, the second switch pipe is field effect transistor
Pipe, its drain electrode is connected as the 3rd node with the emitter stage of the first switch pipe；3rd switching tube, the 3rd switching tube is
Field-effect transistor, its drain electrode is connected as fourth node with the emitter stage of the second switch pipe；4th switching tube, described
Four switching tubes are bipolar transistor, and its colelctor electrode is connected as the 5th node with the emitter stage of the 3rd switching tube, its source
Pole is connected as the 6th node with the negative pole of second DC source；First diode, its negative electrode is connected to the first switch
The colelctor electrode of pipe, its anode is connected to the emitter stage of the first switch pipe；Second diode, its negative electrode is connected to the described 4th
The colelctor electrode of switching tube, its anode is connected to the emitter stage of the 4th switching tube；3rd diode, its anode is connected to described
First node, its negative electrode is connected to the 3rd node；4th diode, its anode is connected to the 5th node, its negative electrode
It is connected to the first node；5th diode, its anode is connected to the fourth node, and its negative electrode is connected to the second section
Point；6th diode, its anode is connected to the 6th node, and its negative electrode is connected to the fourth node；5th switching tube connects
It is connected between Section Point and fourth node；Filter unit, the two ends of the filter unit are connected to the first node
And fourth node.
2. a kind of three-level inverter according to claim 1, it is characterised in that the field-effect transistor is
MOSFET；The bipolar transistor is IGBT.
3. a kind of three-level inverter according to claim 1 and 2, it is characterised in that the filter unit includes inductance
And electric capacity, one end of the inductance is connected to the fourth node, and one end of the electric capacity is connected to the other end of the inductance,
The other end of the electric capacity is connected to the first node.
4. three-level inverter according to claim 1 and 2, it is characterised in that the 5th switching tube is that field-effect is brilliant
Body pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710165190.6A CN106655852A (en) | 2017-03-20 | 2017-03-20 | Three-level inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710165190.6A CN106655852A (en) | 2017-03-20 | 2017-03-20 | Three-level inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106655852A true CN106655852A (en) | 2017-05-10 |
Family
ID=58848423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710165190.6A Pending CN106655852A (en) | 2017-03-20 | 2017-03-20 | Three-level inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106655852A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110784117A (en) * | 2019-11-12 | 2020-02-11 | 国网湖南省电力有限公司 | Five-switch four-level inverter circuit, single-phase inverter and three-phase inverter thereof |
| WO2022110685A1 (en) * | 2020-11-25 | 2022-06-02 | 华为数字能源技术有限公司 | Neutral point clamped inverter and photovoltaic power supply system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611343A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Three-level inverter |
-
2017
- 2017-03-20 CN CN201710165190.6A patent/CN106655852A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611343A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Three-level inverter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110784117A (en) * | 2019-11-12 | 2020-02-11 | 国网湖南省电力有限公司 | Five-switch four-level inverter circuit, single-phase inverter and three-phase inverter thereof |
| WO2022110685A1 (en) * | 2020-11-25 | 2022-06-02 | 华为数字能源技术有限公司 | Neutral point clamped inverter and photovoltaic power supply system |
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