CN109088557A - A kind of cascade multilevel inverter - Google Patents
A kind of cascade multilevel inverter Download PDFInfo
- Publication number
- CN109088557A CN109088557A CN201811138373.XA CN201811138373A CN109088557A CN 109088557 A CN109088557 A CN 109088557A CN 201811138373 A CN201811138373 A CN 201811138373A CN 109088557 A CN109088557 A CN 109088557A
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- Prior art keywords
- switching
- switch
- diode
- inverter
- switching tube
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Classifications
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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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- 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
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
Abstract
The present invention relates to a kind of cascade multilevel inverter, which is composed in parallel by a main switch circuit and multipair switching power circuit.Wherein by four switching tubes, the first bridge arm and the second bridge arm in series, the midpoint of the first bridge arm are connected main switch circuit with the second bridge arm midpoint two-by-two；Switching power circuit includes a DC power supply and two switching tubes, and the anode of DC power supply is connected with the collector of a switching tube, and cathode is connected with the emitter of another switching tube.Switching power circuit is successively parallel to the two sides of inverter in pairs of form, output positive and negative charge as inverter after last is respectively connected to the switching tube of switching power circuit.The cascade type DC-to-AC converter under identical output voltage grade, reduces the quantity and switching loss of device for power switching compared with the cascaded multilevel inverter of traditional structure, effectively reduces the manufacture and maintenance cost of inverter, improves the efficiency of inverter.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of tandem type electrical level inverters.
Background technique
Compared with traditional two-level inverter multi-electrical level inverter have many intrinsic advantages, output voltage it is total humorous
Wave distortion is substantially reduced with the increase of level number；Under conditions of output phase homogenous quantities voltage waveform, switching loss is small, switchs frequency
Rate is lower；Under identical voltage class, du/dt is obviously reduced, and in high-voltage large-capacity motor driven, can effectively prevent motor
Rotor winds insulation breakdown, while improving the emi characteristics etc. of device.Therefore it is increasingly becoming electric and electronic power transformation neck
The important research hot spot that domain is concerned is widely used in middle high-pressure speed regulation field and flexible AC transmitting system.
Current main multi-electrical level inverter includes that how electric diode clamp type multi-electrical level inverter, striding capacitance clamping type be
Flat inverter and Cascade H bridge type multi-electrical level inverter.When needing to realize higher voltage class and number of levels, diode clamp
Clamp diode device and flying capacitor needed for position formula multi-electrical level inverter and striding capacitance clamping type multi-electrical level inverter
Number of packages mesh will sharply increase, and there is a problem of capacitor voltage balance control difficulty.And Cascade H bridge type multi-electrical level inverter ratio
It is easier to realize biggish number of levels and voltage class.But with the increase of voltage class, Cascade H bridge-type multi-level inverse conversion
The cascade number of unit of device also will increase, and switching device quantity increases therewith.For example, seven electrical level inverter of traditional cascaded H-bridges,
12 power switch tubes are just needed when realizing seven level voltage of output.Therefore, how to be obtained by less switching device number
More number of levels and higher voltage class become always the hot spot in multi-electrical level inverter research field.
Summary of the invention
The purpose of the present invention is: it proposes a kind of new cascade multilevel inverter, subtracts under identical output voltage grade
Few switching device number, saves system cost at the structure for improving inverter efficiency, simplifying inverter.
Realize that technical scheme is as follows: a kind of cascade multilevel inverter, by a main switch circuit and more
Switching power circuit is composed in parallel.
Main switch circuit of the invention is by first switch tube, second switch, third switching tube, the 4th switching tube, first
Diode, the second diode, third diode, the 4th diode are constituted.
The collector of first switch tube is connected with the emitter of third switching tube constitutes the first bridge arm, the collection of second switch
Electrode is connected with the emitter of the 4th switching tube constitutes the second bridge arm, and the midpoint of the first bridge arm is connected with the midpoint of the second bridge arm.
Four switching tubes form a H bridge, and the working method by controlling different bridge arm switching tubes enables inverter having output just
Level and negative level.
The anode of first diode is connected with the emitter of first switch tube, the cathode and first switch tube of first diode
Collector is connected, and the anode of second diode is connected with the emitter of second switch, the cathode of the second diode and the
Two switch pipe collectors are connected；The anode of the third diode is connected with the emitter of third switching tube, third diode
Cathode is connected with third switch pipe collector；The anode of 4th diode is connected with the emitter of the 4th switching tube, and the 4th
The cathode of diode is connected with the 4th switch pipe collector.
Switch power supply of the invention routes a DC power supply and two switching tubes are constituted, the anode and one of DC power supply
The collector of a switching tube is connected, and cathode is connected with the emitter of another switching tube.The emitter and collector of switching tube point
It is not connected with the anode and cathode of a diode.
Switching power circuit of the invention is successively parallel to the two sides of inverter, first pair of Switching Power Supply in pairs of form
The DC power supply of circuit is connected with anode with the collector of switching tube, and the mode of the emitter of cathode and switching tube is parallel to respectively
First bridge arm of main switch circuit two sides and the switching tube of the second bridge arm, switching power circuit then is in the same way successively
It is parallel to the previous switching tube to switching power circuit in inverter two sides, last switching tube collection to switching power circuit two sides
Output end as inverter after electrode is connected with emitter.
Inverter of the invention includes multipair switching power circuit, and n is more than or equal to 1.
Each pair of switching power circuit of the invention is using the equal DC power supply of voltage value, between different Switching Power Supply groups
Voltage value not equal DC power supply can be used.
Switching tube of the invention uses MOSFET metal oxide layer semiconductcor field effect transisto, PowerMosfet field of electric force
Effect transistor, CoolMosfet knot high pressure field-effect tube, any one in TGBT insulated gate bipolar transistor deeply, it is described
Diode is all diode included inside separate diode or power switch tube.
The invention has the beneficial effects that: the present invention provides a kind of cascade multilevel inverters, with traditional structure
Cascaded multilevel inverter is compared under identical output voltage grade, and the quantity and switching loss of device for power switching are reduced,
The manufacture and maintenance cost for effectively reducing inverter, improve the efficiency of inverter.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the cascade multilevel inverter of tandem type electrical level inverter of the present invention；
When Fig. 2 is n=2 in a kind of circuit diagram of the cascade multilevel inverter of tandem type electrical level inverter of the present invention
A kind of topological structure schematic diagram；
When Fig. 3 is n=2 in a kind of circuit diagram of the cascade multilevel inverter of tandem type electrical level inverter of the present invention
Another topological structure schematic diagram.
Specific embodiment
Below with reference to attached drawing, the specific descriptions of optional embodiment of the invention are given.
Fig. 1 shows cascade multilevel inverter structural schematic diagram of the invention.The inverter is by a main switch electricity
Road SW and multipair switching power circuit SW1~SWn are composed in parallel.
The main switch circuit SW of the present embodiment inverter is switched by first switch tube S1, second switch S2, third
Pipe S3, the 4th switching tube S4, first diode D1, the second diode D2, third diode D3, the 4th diode constitute D4.
The transmitting of the collector and third switching tube S3 of the first switch tube S1 of the present embodiment inverter main switch circuit SW
Extremely it is connected and constitutes the first bridge arm, the emitter of second switch S2 is connected with the collector of the 4th switching tube S4 constitutes the second bridge
Arm, the midpoint of the first bridge arm are connected with the midpoint of the second bridge arm.
The anode of the first diode D1 of the present embodiment inverter main switch circuit SW and the emitter of first switch tube S1
It is connected, the cathode of first diode D1 is connected with first switch tube S1 collector, the anode and second of the second diode D2
The emitter of switching tube S2 is connected, and the cathode of the second diode D2 is connected with second switch S2 collector；Three or two pole
The anode of pipe D3 is connected with the emitter of third switching tube S3, cathode and the third switching tube S3 collector phase of third diode D3
Even；The anode of the 4th diode D4 is connected with the emitter of the 4th switching tube S4, the cathode and the 4th of the 4th diode D4
Switching tube S4 collector is connected.
The multipair switching power circuit SWAn and SWBn of the present embodiment inverter is respectively by a DC power supply and two
Switching tube Sa2n+1 and Sb2n+1 are constituted, the current collection of the anode and switching tube Sa2n+1 of the DC power supply of switching power circuit SWAn
Extremely it is connected, cathode is connected with the emitter of switching tube Sa2n+2, anode and the switch of the DC power supply of switching power circuit SWBn
The collector of pipe Sb2n+1 is connected, and cathode is connected with the emitter of switching tube Sb2n+2.
The DC power anode and main switch circuit switching tube of 1st couple of switching power circuit SWA1 of the present embodiment inverter
The collector of S2 is connected, and cathode is connected with the emitter of switching tube S1, the DC power anode of switching power circuit SWB1 and master
The collector of switching circuit switching tube S3 is connected, and cathode is connected with the emitter of switching tube S4.
The n-th of the present embodiment inverter opens the DC power anode of (n > 1) switching power circuit SWAn with main previous stage
The collector of the switching tube Sa2n-3 of powered-down source circuit SWAn-1 is connected, and cathode is connected with the emitter of switching tube Sa2n-2, opens
The DC power anode of powered-down source circuit SWBn and the collection with the switching tube Sb2n-3 of main previous stage switching power circuit SWBn-1
Electrode is connected, and cathode is connected with the emitter of switching tube Sb2n-2.
Last emitter and switch to the switching tube Sa2n-1 of switching power circuit SWAn of the present embodiment inverter
Anode after pipe Sa2n collector is connected as inverter output end, the current collection of the switching tube Sb2n-1 of switching power circuit SWBn
Pole be connected with switching tube Sb2n emitter after as inverter output end cathode.
A kind of topological structure schematic diagram when Fig. 2 is inverter n=2 shown in Fig. 1, inverter is by a main switch electricity at this time
Road SW and two pairs of switching power circuit SWA1, SWB1, SWA2, SWB2 compositions, the direct current power source voltage of all switching power circuits
It is identical.
A kind of topological structure schematic diagram when Fig. 2 is inverter n=2 shown in Fig. 1, inverter is by a main switch electricity at this time
Road SW and two pairs of switching power circuit SWA1, SWB1, SWA2, SWB2 compositions, the direct current power source voltage of all switching power circuits
It is identical.
When table 1 is n=2 in a kind of circuit diagram of the cascade multilevel inverter of tandem type electrical level inverter, different groups
Switching power circuit direct current power source voltage it is identical when switch state and output voltage correspond to table.
When table 2 is n=2 in a kind of circuit diagram of the cascade multilevel inverter of tandem type electrical level inverter, different groups
The asynchronous switch state of switching power circuit direct current power source voltage and output voltage correspond to table.
Inverter topology knot as described above, when the switching power circuit direct current power source voltage of different groups is identical, when n=2
Structure can export nine kinds of 4E, 3E, 2E, E, 0,-E, -2E, -3E, -4E voltage levels.The switching power circuit direct current of difference group
When the voltage difference of source, inverter topology when n=2 can export 6E, 5E, 4E, 3E, 2E, E, 0,-E, -2E, -3E, -
13 kinds of voltage levels of 4E, -5E, -6E.
When the inverter of the present embodiment is made of multipair switching power circuit, the switching power circuit DC power supply of difference group
Exportable 4n+1 kind level in total when voltage is identical, when switching power circuit direct current power source voltage difference of difference group, in total can be defeated
4n+1 kind level out, the switching device quantity needed are 4n+4.
It should be understood that each power switch tube in above embodiment structure can be used there are many selection
MOSFET metal oxide layer semiconductcor field effect transisto, PowerMosfet electric power field effect transistor, CoolMosfet are tied deeply
Any one in high pressure field-effect tube, TGBT insulated gate bipolar transistor pipe.
It should be understood that each anti-paralleled diode in above embodiment structure is that separate diode or power are opened
Close diode included inside pipe.
Claims (4)
1. a kind of cascade multilevel inverter, it is characterised in that: the inverter is by a main switch circuit and multipair opens
Powered-down source circuit composes in parallel, and switching power circuit is successively parallel to the two sides of inverter, a pair of switches in pairs of form
The DC power anode of power circuit is connected with the collector of switching tube, and cathode is parallel to the first bridge arm of main switch circuit two sides
With the emitter of the switching tube of the second bridge arm, switching power circuit then is equally with the current collection of DC power anode and switching tube
The mode of the emitter of extremely connected, cathode and switching tube is successively parallel to the previous switch to switching power circuit in inverter two sides
Pipe, output end as inverter after last is connected to the switch pipe collector of switching power circuit two sides with emitter；Institute
Main switch circuit is stated by first switch tube, second switch, third switching tube, the 4th switching tube, first diode, the two or two pole
Pipe, third diode, the 4th diode are constituted, and the collector of first switch tube is connected with the emitter of third switching tube constitutes the
One bridge arm, the emitter of second switch is connected with the collector of the 4th switching tube constitutes the second bridge arm, the midpoint of the first bridge arm
It is connected with the midpoint of the second bridge arm, the anode of the first diode is connected with the emitter of first switch tube, first diode
Cathode be connected with first switch pipe collector, the anode of second diode is connected with the emitter of second switch,
The cathode of two diodes is connected with second switch pipe collector；The anode of the third diode and the emitter of third switching tube
It is connected, the cathode of third diode is connected with third switch pipe collector；The anode and the 4th switching tube of 4th diode
Emitter be connected, the cathode of the 4th diode with the 4th switch pipe collector be connected；The switch power supply routes one directly
Galvanic electricity source, two switching tubes and two diodes are constituted, and the anode of DC power supply is connected with the collector of a switching tube, cathode
Be connected with the emitter of another switching tube, the emitter and collector of the switching tube respectively with the anode of diode and
Cathode is connected.
2. cascade multilevel inverter according to claim 1, which is characterized in that the inverter includes multipair switch electricity
Source circuit, n are more than or equal to 1.
3. cascade multilevel inverter according to claim 1, it is characterised in that each pair of switch power supply
Voltage value not equal DC power supply can be used between different Switching Power Supply groups using the equal DC power supply of voltage value in road.
4. cascade multilevel inverter according to claim 1, it is characterised in that the switching tube is double using insulated gate
Any one in bipolar transistor pipe, the diode are all two poles included inside separate diode or power switch tube
Pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811138373.XA CN109088557A (en) | 2018-09-28 | 2018-09-28 | A kind of cascade multilevel inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811138373.XA CN109088557A (en) | 2018-09-28 | 2018-09-28 | A kind of cascade multilevel inverter |
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| Publication Number | Publication Date |
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| CN109088557A true CN109088557A (en) | 2018-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811138373.XA Pending CN109088557A (en) | 2018-09-28 | 2018-09-28 | A kind of cascade multilevel inverter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969924A (en) * | 2012-11-07 | 2013-03-13 | 燕山大学 | Novel voltage type multi-level inverter |
| CN105305861A (en) * | 2015-10-26 | 2016-02-03 | 东南大学 | Cascaded multilevel inverter |
| CN208723806U (en) * | 2018-09-28 | 2019-04-09 | 华东交通大学 | A kind of cascade multilevel inverter |
-
2018
- 2018-09-28 CN CN201811138373.XA patent/CN109088557A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969924A (en) * | 2012-11-07 | 2013-03-13 | 燕山大学 | Novel voltage type multi-level inverter |
| CN105305861A (en) * | 2015-10-26 | 2016-02-03 | 东南大学 | Cascaded multilevel inverter |
| CN208723806U (en) * | 2018-09-28 | 2019-04-09 | 华东交通大学 | A kind of cascade multilevel inverter |
Non-Patent Citations (2)
| Title |
|---|
| 1AJESH P S PG SCHOLAR 等: ""Performance Analysis of Cascadable U-Cell Multi Level Inverter"", 《2017 IEEE INTERNATIONAL CONFERENCE ON TECHNOLOGICAL ADVANCEMENTS IN POWER AND ENERGY (TAP ENERGY》, pages 2 * |
| HANI VAHEDI 等: ""A Novel Multilevel Multioutput Bidirectional Active Buck PFC Rectifier"", 《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》, pages 5445 * |
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