CN103647471A - Seven-level inverter - Google Patents
Seven-level inverter Download PDFInfo
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- CN103647471A CN103647471A CN201310751266.5A CN201310751266A CN103647471A CN 103647471 A CN103647471 A CN 103647471A CN 201310751266 A CN201310751266 A CN 201310751266A CN 103647471 A CN103647471 A CN 103647471A
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Abstract
The invention provides a seven-level inverter. The seven-level inverter comprises two direct-current booster circuits, ten switching tubes, eight diodes, four capacitor cells and two inductors, and can realize seven-level output in an active power mode and a reactive power mode. Therefore, compared with a five-level inverter, the seven-level inverter has the advantages that the efficiency is high, so that the harmonic wave content of output voltage and current can be reduced. In addition, the inverter also has the advantages of being small in volume, and suitable for occasions with input of high voltage, wherein the voltage stress of the switching tubes is small.
Description
Technical field
The present invention relates to electric and electronic technical field, especially relate to a kind of seven electrical level inverters.
Background technology
In recent years, multilevel converter is more and more concerned, compares two traditional Level Technology, and multilevel converter has that devices switch stress is low, and switching loss is little, the feature that output filter is little and harmonic content is little.For example Fig. 1 is a kind of five-electrical level inverter of common diode clamp type.
Yet, with respect to the five-electrical level inverter shown in Fig. 1, how further to improve the efficiency of inverter, thereby reduce the harmonic content of output voltage and electric current, be the problem that current people are relatively concerned about.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of seven electrical level inverters, with respect to five-electrical level inverter, further improves the efficiency of inverter, thereby further reduces the harmonic content of output voltage and electric current.
For this reason, the technical scheme of technical solution problem of the present invention is:
The invention provides a kind of seven electrical level inverters, described inverter comprises: the first DC voltage booster circuit, the second DC voltage booster circuit, the first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube, the 9th switching tube, the tenth switching tube, the first diode, the second diode, the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the 7th diode, the 8th diode, the first capacitor cell, the second capacitor cell, the 3rd capacitor cell, the 4th capacitor cell, the first inductance and the second inductance,
The first input end of described the first DC voltage booster circuit connect the positive pole of DC power supply, the positive pole of the first end of described the second capacitor cell, described the first diode, the first end of the first end of described the 9th switching tube and the first branch road; Described the first branch road comprises described the 7th switching tube and described the 5th diode of series connection; Wherein, described the 5th diode makes electric current flow to first end from the second end of described the first branch road; The first end of described the 7th switching tube connects the first end of described the first branch road, or the second end of described the 7th switching tube connects the second end of described the first branch road;
The second input of described the first DC voltage booster circuit connect the first output of described the first DC voltage booster circuit, the first output of the second input of described the second DC voltage booster circuit, described the second DC voltage booster circuit, the second end of the second end of described the first capacitor cell, described the second capacitor cell, the negative pole of anodal and described the 3rd diode of the first end of the first end of described the 3rd capacitor cell, described the 4th capacitor cell, described the second diode;
The second output of described the first DC voltage booster circuit connects the negative pole of the first end of described the first capacitor cell, the first end of described the first switching tube and described the 7th diode;
The first input end of described the second DC voltage booster circuit connects negative pole, the second end of described the 3rd capacitor cell, the negative pole of described the 4th diode, the second end of described the tenth switching tube and the first end of the second branch road of described DC power supply; Described the second branch road comprises described the 8th switching tube and described the 6th diode of series connection; Wherein, described the 6th diode makes electric current flow to the second end from the first end of described the second branch road; The first end of described the 8th switching tube connects the first end of described the second branch road, or the second end of described the 8th switching tube connects the second end of described the second branch road;
The second output of described the second DC voltage booster circuit connects the second end, the second end of described the 6th switching tube and the positive pole of described the 8th diode of described the 4th capacitor cell;
The second end of described the first switching tube connects the negative pole of described the first diode and the first end of described second switch pipe;
The second end of described second switch pipe connects the negative pole of described the second diode and the first end of described the 3rd switching tube;
The second end of described the 3rd switching tube connects the first end of the second end of described the second branch road, the negative pole of described the 8th diode and described the first inductance;
The first end of described the 4th switching tube connects the first end of anodal and described second inductance of the second end of described the first branch road, described the 7th diode;
The second end of described the 4th switching tube connects the positive pole of described the 3rd diode and the first end of described the 5th switching tube;
The second end of described the 5th switching tube connects the positive pole of described the 4th diode and the first end of described the 6th switching tube;
The second end of described the 9th switching tube connects the first end of described the tenth switching tube;
The second end of described the first inductance connects the second end of described the second inductance, as the first ac output end of described inverter; The second end of described the 9th switching tube is as the second ac output end of described inverter.
Preferably, during described the first switching tube conducting, electric current flows to the second end from the first end of described the first switching tube; During described second switch pipe conducting, electric current flows to the second end from the first end of described second switch pipe; During described the 3rd switching tube conducting, electric current flows to the second end from the first end of described the 3rd switching tube; During described the 4th switching tube conducting, electric current flows to the second end from the first end of described the 4th switching tube; During described the 5th switching tube conducting, electric current flows to the second end from the first end of described the 5th switching tube; During described the 6th switching tube conducting, electric current flows to the second end from the first end of described the 6th switching tube; During described the 7th switching tube conducting, electric current flows to first end from the second end of described the 7th switching tube; During described the 8th switching tube conducting, electric current flows to the second end from the first end of described the 6th switching tube; During described the 9th switching tube conducting, electric current flows to the second end from the first end of described the 6th switching tube; During described the tenth switching tube conducting, electric current flows to the second end from the first end of described the 6th switching tube.
Preferably, described inverter has eight kinds of meritorious operation modes, is respectively the first operation mode, the second operation mode, the 3rd operation mode, the 4th operation mode, the 5th operation mode, the 6th operation mode, the 7th operation mode and the 8th operation mode;
Described inverter is when described the first operation mode, described the first switching tube, described second switch pipe, described the 3rd switching tube and described the tenth switching tube conducting, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the second operation mode, described second switch pipe, described the 3rd switching tube and described the tenth switching tube conducting, described the first switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the 3rd operation mode, described the 3rd switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the 4th operation mode, described the 8th switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the 5th operation mode, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described the 6th operation mode, described the 4th switching tube, described the 5th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described the 7th operation mode, described the 4th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described the 8th operation mode, described the 7th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 8th switching tube and described the tenth switching tube turn-off.
Preferably, the periodic signal of described inverter output is divided into the first period, the second period, the 3rd period, the 4th period, the 5th period, the 6th period, the 7th period, the 8th period, the 9th period and the tenth period in one-period;
In described the first period and described the 5th period, described inverter is alternately in the 3rd operation mode and the 4th operation mode;
In described the second period and described the 4th period, described inverter is alternately in the second operation mode and the 3rd operation mode;
In described the 3rd period, described inverter is alternately in the first operation mode and the second operation mode;
In described the 6th period and described the tenth period, described inverter is alternately in the 7th operation mode and the 8th operation mode;
In described the 7th period and described the 9th period, described inverter is alternately in the 6th operation mode and the 7th operation mode;
In described the 8th period, described inverter is alternately in the 5th operation mode and the 6th operation mode.
Preferably, described inverter has eight kinds of idle operation modes, is respectively the 9th operation mode, the tenth operation mode, the 11 operation mode, the 12 operation mode, the 13 operation mode, the 14 operation mode, the 15 operation mode and the 16 operation mode;
Described inverter is when described the 9th operation mode, described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the tenth operation mode, described the 7th switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described 11 operation mode, described the 4th switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 7th switching tube, described the 5th switching tube, described the 6th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described 12 operation mode, described the 4th switching tube, described the 5th switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 7th switching tube, described the 6th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described 13 operation mode, described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described 14 operation mode, described the 8th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube and described the tenth switching tube turn-off;
Described inverter is when described 15 operation mode, described the 3rd switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described 16 operation mode, described second switch pipe, described the 3rd switching tube and described the 9th switching tube conducting, described the first switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off.
Preferably, described first ac output end of described inverter and described the second ac output end are connected in parallel on the two ends of AC network, and the two ends of described AC network are parallel filtering electric capacity also.
Preferably, described first ac output end of described inverter and described the second ac output end are connected in parallel on the former limit of transformer, the secondary AC network in parallel of described transformer.
Preferably, described the first DC voltage booster circuit comprises the 3rd inductance, the 9th diode and the 11 switching tube;
The first end of described the 3rd inductance is the first input end of described the first DC voltage booster circuit; The second end of described the 3rd inductance connects the first end of described the 11 switching tube and the positive pole of described the 9th diode;
The second end of described the 11 switching tube is the first output and second input of described the first DC voltage booster circuit;
The negative pole of described the 9th diode is the second output of described the first DC voltage booster circuit.
Preferably, described the second DC voltage booster circuit comprises the 4th inductance, the tenth diode and twelvemo pass pipe;
The first end of described the 4th inductance is the first input end of described the second DC voltage booster circuit; The second end of described the 4th inductance connects described twelvemo and closes the second end of pipe and the negative pole of described the tenth diode;
The first end that described twelvemo is closed pipe is the first output and second input of described the second DC voltage booster circuit;
The second output of just very described second DC voltage booster circuit of described the tenth diode.
Known by technique scheme, seven electrical level inverters that the embodiment of the present invention provides comprise two DC voltage booster circuit, ten switching tubes, eight diodes, four capacitor cells and two inductance, when meritorious pattern and idle pattern, all can realize seven level outputs, therefore than five-electrical level inverter, efficiency is higher, thereby has reduced the harmonic content of output voltage and electric current.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing a kind of five-electrical level inverter;
Fig. 2 is the circuit diagram of the specific embodiment of seven electrical level inverters provided by the invention;
Fig. 3 is the circuit diagram of the embodiment connection transformer shown in Fig. 2;
Fig. 4 is a kind of optional circuit diagram of the embodiment shown in Fig. 2;
Fig. 5 is a kind of optional circuit diagram of the embodiment shown in Fig. 2;
Fig. 6 is a kind of optional circuit diagram of the embodiment shown in Fig. 2;
Fig. 7 a is the circuit turn-on figure of the first operation mode of the inverter shown in Fig. 2;
Fig. 7 b is the circuit turn-on figure of the second operation mode of the inverter shown in Fig. 2;
Fig. 7 c is the circuit turn-on figure of the 3rd operation mode of the inverter shown in Fig. 2;
Fig. 7 d is the circuit turn-on figure of the 4th operation mode of the inverter shown in Fig. 2;
Fig. 7 e is the circuit turn-on figure of the 5th operation mode of the inverter shown in Fig. 2;
Fig. 7 f is the circuit turn-on figure of the 6th operation mode of the inverter shown in Fig. 2;
Fig. 7 g is the circuit turn-on figure of the 7th operation mode of the inverter shown in Fig. 2;
Fig. 7 h is the circuit turn-on figure of the 8th operation mode of the inverter shown in Fig. 2;
Fig. 8 is the periodic signal of the inverter output shown in Fig. 2;
Fig. 9 a is the circuit turn-on figure of the 9th operation mode of the inverter shown in Fig. 2;
Fig. 9 b is the circuit turn-on figure of the tenth operation mode of the inverter shown in Fig. 2;
Fig. 9 c is the circuit turn-on figure of the 11 operation mode of the inverter shown in Fig. 2;
Fig. 9 d is the circuit turn-on figure of the 12 operation mode of the inverter shown in Fig. 2;
Fig. 9 e is the circuit turn-on figure of the 13 operation mode of the inverter shown in Fig. 2;
Fig. 9 f is the circuit turn-on figure of the 14 operation mode of the inverter shown in Fig. 2;
Fig. 9 g is the circuit turn-on figure of the 15 operation mode of the inverter shown in Fig. 2;
Fig. 9 h is the circuit turn-on figure of the 16 operation mode of the inverter shown in Fig. 2.
Embodiment
The five-electrical level inverter topology that figure l is the diode clamping type that provides in prior art.Yet, with respect to the five-electrical level inverter shown in Fig. 1, how further to improve the efficiency of inverter, thereby reduce the harmonic content of output voltage and electric current, be the problem that current people are relatively concerned about.
The embodiment of the present invention provides a kind of seven electrical level inverters, with respect to five-electrical level inverter, further improves the efficiency of inverter, thereby further reduces the harmonic content of output voltage and electric current.
In addition, in Fig. 1, diode DB1, DB2, DB3, DB4, DB5 and DB6 are clamped formula diode, and its effect is to provide path and protection electric capacity not by short circuit for electric current.For example, diode DB1 is for clamped in the lower end of capacitor C l by the current potential of switch transistor T l lower end; Diode DB2 is for clamped in the lower end of capacitor C l by the current potential of switch transistor T 5 lower ends; Other diodes DB3, DB4, DB5 and DB6 are similar, do not repeat them here.
Yet; being reached for electric current provides path and protection electric capacity not by the object of short circuit; clamped formula diode needs to block many times of level voltages; conventionally need the clamped formula diode series connection of a plurality of same nominal values; but the dispersiveness based on clamped formula diode and the impact of stray parameter; the pressure that the clamped formula diode that nominal value is identical can bear is difference to some extent also, is together in series like this and may causes the clamped formula diode two ends overvoltage having.Therefore, need to all press measure and very large RC(phase-shift circuit) absorbing circuit, but will causing the bulky of inductance in inverter and filter capacitor like this, cost increases.
Therefore,, in seven electrical level inverters that provide in the embodiment of the present invention, also further solved inductance and the bulky problem of filter capacitor in inverter, thereby saved cost.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
Refer to Fig. 2, the invention provides the first embodiment of seven electrical level inverters, in the present embodiment, seven electrical level inverters comprise: the first DC voltage booster circuit 201, the second DC voltage booster circuit 202 and inverter circuit 203, inverter circuit 203 comprises: the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8, the 9th switching tube Q
l1, the tenth switching tube Q
l2, the first diode D
1, the second diode D
2, the 3rd diode D
3, the 4th diode D
4, the 5th diode D
5, the 6th diode D
6, the 7th diode D
7, the 8th diode D
8, the first capacitor cell C
1, the second capacitor cell C
2, the 3rd capacitor cell C
3, the 4th capacitor cell C
4, the first inductance L
1with the second inductance L
2.
The first input end of the first DC voltage booster circuit 201 connects positive pole, the second capacitor cell C of DC power supply DC
2first end, the first diode D
1positive pole, the 9th switching tube Q
l1first end and the first end of the first branch road.The first branch road comprises the 7th switching tube Q of series connection
h7with the 5th diode D
5; Wherein, the 5th diode D
5make electric current flow to first end from the second end of the first branch road; The 7th switching tube Q
h7first end connect the first end of the first branch road or the 7th switching tube Q
h7the second end connect the second end of the first branch road.
The second input of the first DC voltage booster circuit 201 connects the first output of the first DC voltage booster circuit 201, the first output of the second input of the second DC voltage booster circuit 202, the second DC voltage booster circuit 202, the first capacitor cell C
1the second end, the second capacitor cell C
2the second end, the 3rd capacitor cell C
3first end, the 4th capacitor cell C
4first end, the second diode D
1positive pole and the 3rd diode D
3negative pole.
The second output of the first DC voltage booster circuit 201 connects the first capacitor cell C
1first end, the first switching tube Q
h1first end and the 7th diode D
7negative pole.
The first input end of the second DC voltage booster circuit 202 connects negative pole, the 3rd capacitor cell C of DC power supply DC
3the second end, the 4th diode D
4negative pole, the tenth switching tube Q
l2the second end and the first end of the second branch road; The second branch road comprises the 8th switching tube Q of series connection
h8with the 6th diode D
6; Wherein, the 6th diode D
6make electric current flow to the second end from the first end of the second branch road; The 8th switching tube Q
h8first end connect the first end of the second branch road or the 8th switching tube Q
h8the second end connect the second end of the second branch road.
The second output of the second DC voltage booster circuit 202 connects the 4th capacitor cell C
4the second end, the 6th switching tube Q
h6the second end and the 8th diode D
8positive pole.
The first switching tube Q
h1the second end connect the first diode D
1negative pole and second switch pipe Q
h2first end.
Second switch pipe Q
h2the second end connect the second diode D
2negative pole and the 3rd switching tube Q
h3first end.
The 3rd switching tube Q
h3the second end connect the second end, the 8th diode D of the second branch road
8negative pole and the first inductance L
1first end.
The 4th switching tube Q
h4first end connect the second end, the 7th diode D of the first branch road
7positive pole and the second inductance L
2first end.
The 4th switching tube Q
h4the second end connect the 3rd diode D
3positive pole and the 5th switching tube Q
h5first end.
The 5th switching tube Q
h5the second end connect the 4th diode D
4positive pole and the 6th switching tube Q
h6first end.
The 9th switching tube Q
l1the second end connect the tenth switching tube Q
l2first end.
The first inductance L
1the second end connect the second inductance L
2the second end, as the first ac output end of seven electrical level inverters of the present embodiment; The 9th switching tube Q
l1the second end as the second ac output end of seven electrical level inverters of the present embodiment.
Known by technique scheme, seven electrical level inverters that the present embodiment provides comprise two DC voltage booster circuit, ten switching tubes, eight diodes, four capacitor cells and two inductance, when meritorious pattern and idle pattern, all can realize seven level outputs, therefore than five-electrical level inverter, efficiency is higher, thereby has reduced the harmonic content of output voltage and electric current.
In addition seven electrical level inverters that, the present embodiment provides also have the following advantages:
1, owing to there being power frequency brachium pontis (i.e. the 9th switching tube Q
l1, the tenth switching tube Q
l2the brachium pontis forming), so the busbar voltage utilance of the present embodiment is higher, i.e. same output voltage, and required busbar voltage is more much lower than the many level scheme of " 1 " type shown in Fig. 1.
2, due to the present embodiment, be the inverter of seven level, therefore than the five-electrical level inverter shown in Fig. 1, the voltage stress of switching tube is less.
3, in seven electrical level inverters of the present embodiment, as the 9th switching tube Q
l1during conducting, the second ac output end (being the N point in Fig. 2) connects the 3rd capacitor cell C
3the second end, as the tenth switching tube Q
l2during conducting, the second ac output end (being the N point in Fig. 2) connects the second capacitor cell C
2first end, and the second ac output end connects electrical network N line conventionally, and electrical network N line and ground potential are close, so the DC power supply DC in the present embodiment anodal (or negative pole) is with respect to there will not be high frequency leaping voltage between the earth, thereby improved operating efficiency and the reliability of inverter.
4, the inverter of the present embodiment, because prime has increased DC voltage booster circuit, broadens input voltage range.And simple in structure, device is less, and modulation strategy is simple, without complicated logical circuit.
In the present embodiment, the first branch road comprises the 7th switching tube Q of series connection
h7with the 5th diode D
5; Wherein, the 5th diode D
5make electric current flow to first end from the second end of the first branch road.Now, can be as shown in Figure 2, i.e. the 7th switching tube Q
h7first end connect the first end of the first branch road, the 7th switching tube Q
h7the second end connect the 5th diode D
5negative pole, the 5th diode D
5positive pole connect the second end of the first branch road.Or also can be by the 7th switching tube Q in Fig. 2
h7with the 5th diode D
5location swap, the 5th diode D now
5negative pole connect the first end of the first branch road, the 5th diode D
5positive pole connect the 7th switching tube Q
h7first end, the 7th switching tube Q
h7the second end connect the second end of the first branch road.
And the second branch road comprises the 8th switching tube Q of series connection
h8with the 6th diode D
6; Wherein, the 6th diode D
6make electric current flow to the second end from the first end of the second branch road.Now, can be as shown in Figure 2, i.e. the 8th switching tube Q
h8first end connect the first end of the second branch road, the 8th switching tube Q
h8the second end connect the 6th diode D
6positive pole, the 6th diode D
6negative pole connect the second end of the second branch road.Or also can be by the 8th switching tube Q in Fig. 2
h8with the 6th diode D
6location swap, now, the 6th diode D
6positive pole connect the first end of the second branch road, the 6th diode D
6negative pole connect the 8th switching tube Q
h8first end, the 8th switching tube Q
h8the second end connect the second end of the second branch road.
As shown in Figure 2, in the present embodiment, between two outputs of inverter (i.e. the first ac output end and the second ac output end), can be connected with AC network u
g.That is to say, the first ac output end and the second ac output end are connected in parallel on AC network u
gtwo ends, AC network u now
gtwo ends parallel filtering capacitor C also
0.
In order to solve issuable power frequency leakage problem, the inverter in the embodiment of the present invention can be as shown in Figure 3, and the first ac output end and the second ac output end are connected in parallel on transformer T
0former limit, and transformer T
0secondary AC network u in parallel
g, AC network u now
gcan parallel filtering capacitor C
0.
Inverter in the present embodiment can be for fields such as photovoltaic generations, so DC power supply DC can be PV(Photo Voltaics, photovoltaic) power supply etc.It should be noted that, the DC power supply DC of take in Fig. 2 is example, in fact, the inverter of the embodiment of the present invention can be connected with a plurality of DC power supply, example as shown in Figure 4, DC power supply comprises DC power supply DC1 and the DC power supply DC2 of two series connection, and now, the common port of DC power supply DC1 and DC power supply DC2 is connected the second capacitor cell C
2with the 3rd capacitor cell C
3common port.
In the present embodiment, the first capacitor cell C
1, the second capacitor cell C
2, the 3rd capacitor cell C
3with the 4th capacitor cell C
4it can be all the unit of capacitance group one-tenth.The quantity of the electric capacity that each capacitor cell is included is circumscribed not.It should be noted that the first capacitor cell C in the present embodiment
1can be by the second capacitor cell C
2form with the 5th capacitor cell, wherein the 5th capacitor cell is connected to the second capacitor cell C
2first end and the first switching tube Q
h1first end between.And the 4th capacitor cell C
4also can be by the 3rd capacitor cell C
3form with the 6th capacitor cell, wherein the 6th capacitor cell is connected to the 3rd capacitor cell C
3the second end and the 6th switching tube Q
h6the second end between.As shown in Figure 5, the first capacitor cell comprises the second capacitor cell C to example
2with the 5th capacitor cell C
5, the 4th capacitor cell comprises the 6th capacitor cell C
3with the 8th capacitor cell C
6.
First DC voltage booster circuit 201 of the present embodiment and the second DC voltage booster circuit 202 can be any type of DC voltage booster circuit, such as BOOST circuit etc., the embodiment of the present invention does not limit this.As shown in Figure 6, the first DC voltage booster circuit 201 can comprise the 3rd inductance L to example
b1, the 9th diode D
b1with the 11 switching tube Q
b1; Wherein, the 3rd inductance L
b1first end be the first input end of the first DC voltage booster circuit 201, the 3rd inductance L
b1the second end connect the 11 switching tube Q
b1first end and the 9th diode D
b1positive pole, the 11 switching tube Q
b1the second end be the first output and second input of the first DC voltage booster circuit 201, the 9th diode D
b1negative pole be the second output of the first DC voltage booster circuit 201.The second DC voltage booster circuit 202 can comprise the 4th inductance L
b2, the tenth diode D
b2close pipe Q with twelvemo
b2.Wherein, the 4th inductance L
b2first end be the first input end of the second DC voltage booster circuit 202; The 4th inductance L
b2the second end connect twelvemo and close pipe Q
b2the second end and the tenth diode D
b2negative pole; Twelvemo is closed pipe Q
b2first end be the first output and second input of the second DC voltage booster circuit 202; The tenth diode D
b2just very the second output of the second DC voltage booster circuit 202.
The first diode D of the present embodiment
1, the second diode D
2, the 3rd diode D
3, the 4th diode D
4, the 5th diode D
5, the 6th diode D
6, the 7th diode D
7with the 8th diode D
8can be silicon carbide diode, fast recovery diode etc.
In the present embodiment, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8, the 9th switching tube Q
l1with the tenth switching tube Q
l2can be all any type of switching tube, such as IGBT, JFET, metal-oxide-semiconductor etc.And the device of each switching tube itself can backward diode in parallel.If each switching tube backward diode in parallel, the first switching tube Q
h1during conducting, electric current is from the first switching tube Q
h1first end flow to the second end, that is to say the first switching tube Q
h1the positive pole of backward diode in parallel connects the first switching tube Q
h1the second end, negative pole connects the first switching tube Q
h1first end.Second switch pipe Q
h2during conducting, electric current is from second switch pipe Q
h2first end flow to the second end, the 3rd switching tube Q
h3during conducting, electric current is from the 3rd switching tube Q
h3first end flow to the second end, the 4th switching tube Q
h4during conducting, electric current is from the 4th switching tube Q
h4first end flow to the second end, the 5th switching tube Q
h5during conducting, electric current is from the 5th switching tube Q
h5first end flow to the second end, the 6th switching tube Q
h6during conducting, electric current is from the 6th switching tube Q
h6first end flow to the second end, the 7th switching tube Q
h7during conducting, electric current is from the 7th switching tube Q
h7the second end flow to first end, the 8th switching tube Q
h8during conducting, electric current is from the 8th switching tube Q
h8first end flow to the second end, the 9th switching tube Q
l1during conducting, electric current is from the 9th switching tube Q
l1first end flow to the second end, the tenth switching tube Q
l2during conducting, electric current is from the tenth switching tube Q
l2first end flow to the second end.
In the present embodiment, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7with the 8th switching tube Q
h8can be HF switch pipe, so when inverter is worked, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7with the 8th switching tube Q
h8hF switch action, the 9th switching tube Q
l1with the tenth switching tube Q
l2can be low frequency switching tube, i.e. power frequency switching tube, therefore when inverter is worked, the 9th switching tube Q
l1with the tenth switching tube Q
l2low frequency switch motion.In the present invention, said high frequency refers generally to be greater than the frequency of 1khz, and low frequency generally refers to the frequency (being generally power frequency, for example 50hz) lower than 1khz.
It should be noted that, the inverter that the embodiment of the present invention provides, not only can be applied to the occasion of demand active power, also can be applied to the occasion of demand reactive power and active power simultaneously.And, as the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7with the 8th switching tube Q
h8for HF switch pipe, and the 9th switching tube Q
l1with the tenth switching tube Q
l2during for low frequency switching tube, inverter in the present embodiment, the circuit of idle operating state and meritorious operating state separately, and when idle pattern, electric current is without the anti-paralleled diode of HF switch pipe, realize the idle separation of high-frequency tube, made the topology of the present embodiment there is stronger reactive power capability.
Below in conjunction with accompanying drawing, the meritorious and idle operating state of the present embodiment is described.In declarative procedure, with the first capacitor cell shown in Fig. 5, comprise the second capacitor cell C
2with the 5th capacitor cell C
5, the 4th capacitor cell comprises the 6th capacitor cell C
3with the 8th capacitor cell C
6situation be example.
As shown in Fig. 7 a-7h, inverter in the present embodiment has eight kinds of meritorious operation modes, is respectively the first operation mode, the second operation mode, the 3rd operation mode, the 4th operation mode, the 5th operation mode, the 6th operation mode, the 7th operation mode and the 8th operation mode.
As shown in Figure 7a, the inverter of the present embodiment is when the first operation mode, and described inverter is exported positive 3 level.Now, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3with the tenth switching tube Q
l2conducting, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the 9th switching tube Q
l1turn-off.Electric current is flowed through successively: the first switching tube Q
h1→ second switch pipe Q
h2the → the three switching tube Q
h3the → the first inductance L
1→ AC network u
gthe → the ten switching tube Q
l2the → the three capacitor cell C
3the → the first capacitor cell.
As shown in Figure 7b, the inverter of the present embodiment is when the second operation mode, and described inverter is exported positive 2 level.Now, second switch pipe Q
h2, the 3rd switching tube Q
h3with the tenth switching tube Q
l2conducting, the first switching tube Q
h1, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the 9th switching tube Q
l1turn-off.Electric current is flowed through successively: the first diode D
1→ second switch pipe Q
h2the → the three switching tube Q
h3the → the first inductance L
1→ AC network u
gthe → the ten switching tube Q
l2the → the three capacitor cell C
3the → the second capacitor cell C
2.
As shown in Figure 7 c, the inverter of the present embodiment is when the 3rd operation mode, and described inverter is exported positive 1 level.Now, the 3rd switching tube Q
h3with the tenth switching tube Q
l2conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the 9th switching tube Q
l1turn-off.Electric current is flowed through successively: the second diode D
2the → the three switching tube Q
h3the → the first inductance L
1→ AC network u
gthe → the ten switching tube Q
l2the → the three capacitor cell C
3.
As shown in Fig. 7 d, the inverter of the present embodiment is when the 4th operation mode, and described inverter is exported positive 0 level.Now, the 8th switching tube Q
h8with the tenth switching tube Q
l2conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7with the 9th switching tube Q
l1turn-off.Electric current is flowed through successively: the second branch road → the first inductance L
1→ AC network u
gthe → the ten switching tube Q
l2.
As shown in Fig. 7 e, the inverter of the present embodiment is when the 5th operation mode, and 3 level are born in described inverter output.Now, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6with the 9th switching tube Q
l1conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the tenth switching tube Q
l2turn-off.Electric current is flowed through successively: the 9th switching tube Q
l1→ AC network u
gthe → the second inductance L
2the → the four switching tube Q
h4the → the five switching tube Q
h5the → the six switching tube Q
h6the → the four capacitor cell → the second capacitor cell C
2.
As shown in Fig. 7 f, the inverter of the present embodiment is when the 6th operation mode, and 2 level are born in described inverter output.Now, the 4th switching tube Q
h4, the 5th switching tube Q
h5with the 9th switching tube Q
l1conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the tenth switching tube Q
l2turn-off.Electric current is flowed through successively: the 9th switching tube Q
l1→ AC network u
gthe → the second inductance L
2the → the four switching tube Q
h4the → the five switching tube Q
h5the → the four diode D
4the → the three capacitor cell C
3the → the second capacitor cell C
2.
As shown in Fig. 7 g, the inverter of the present embodiment is when the 7th operation mode, and 1 level is born in described inverter output.Now, the 4th switching tube Q
h4with the 9th switching tube Q
l1conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the tenth switching tube Q
l2turn-off.Electric current is flowed through successively: the 9th switching tube Q
l1→ AC network u
gthe → the second inductance L
2the → the four switching tube Q
h4the → the three diode D
3the → the second capacitor cell C
2.
As shown in Fig. 7 h, the inverter of the present embodiment is when the 8th operation mode, and 0 level is born in described inverter output.Now, the 7th switching tube Q
h7with the 9th switching tube Q
l1conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 8th switching tube Q
h8with the tenth switching tube Q
l2turn-off.Electric current is flowed through successively: the 9th switching tube Q
l1→ AC network u
gthe → the second inductance L
2the → the first branch road.
It should be noted that, at inverter during in above-mentioned eight meritorious operation modes, the first DC voltage booster circuit 201 and the second DC voltage booster circuit 202 can be always in running order, or the first DC voltage booster circuit 201 is at least in running order when the first operation mode, the second DC voltage booster circuit 202 is at least in running order when the 5th operation mode.
Under above-mentioned eight kinds of meritorious operation modes, inverter can be exported periodic signal.As shown in Figure 8, the periodic signal of inverter output is divided into the first period T1, the second period T2, the 3rd period T3, the 4th period T4, the 5th period T5, the 6th period T6, the 7th period T7, the 8th period T8, the 9th period T9 and the tenth period T10 to example in one-period; Wherein, at the first period T1, the second period T2, the 3rd period T3, the 4th period T4 and the 5th period T5, inverter output positive voltage, at the 6th period T6, the 7th period T7, the 8th period T8, the 9th period T9 and the tenth period T10, inverter output negative voltage.
At the first period T1 and the 5th period T5, inverter is alternately in the 3rd operation mode and the 4th operation mode.Now inverter alternately exports positive 1 and positive 0 level.
At the second period T2 and the 4th period T4, inverter is alternately in the second operation mode and the 3rd operation mode.Now inverter alternately exports positive 1 and positive 2 level.
At the 3rd period T3, inverter is alternately in the first operation mode and the second operation mode.Now inverter alternately exports positive 2 and positive 3 level.
At the 6th period T6 and the tenth period T10, inverter is alternately in the 7th operation mode and the 8th operation mode.Now alternately output negative 1 and negative 0 level of inverter.
At the 7th period T7 and the 9th period T9, inverter is alternately in the 6th operation mode and the 7th operation mode.Now alternately output negative 1 and negative 2 level of inverter.
At the 8th period T8, inverter is alternately in the 5th operation mode and the 6th operation mode.Now alternately output negative 2 and negative 3 level of inverter.
As shown in Fig. 9 a-9h, inverter in the present embodiment has eight kinds of idle operation modes, is respectively the 9th operation mode, the tenth operation mode, the 11 operation mode, the 12 operation mode, the 13 operation mode, the 14 operation mode, the 15 operation mode and the 16 operation mode.
As shown in Fig. 9 a, the inverter of the present embodiment is when the 9th operation mode, and described inverter is exported positive 3 level.Now, the tenth switching tube Q
l2conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the 9th switching tube Q
l1turn-off, electric current is flowed through successively: the 7th diode D
7the → the first capacitor cell → three capacitor cell C
3the → the ten switching tube Q
l2→ AC network u
gthe → the second inductance L
2.
As shown in Fig. 9 b, the inverter of the present embodiment is when the tenth operation mode, and described inverter is exported positive 2 level.Now, the 7th switching tube Q
h7with the tenth switching tube Q
l2conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 8th switching tube Q
h8with the 9th switching tube Q
l1turn-off.Electric current is flowed through successively: the first branch road → the second capacitor cell C
2the → the three capacitor cell C
3the → the ten switching tube Q
l2→ AC network u
gthe → the second inductance L
2.
As shown in Fig. 9 c, the inverter of the present embodiment is when 11 operation mode, and described inverter is exported positive 1 level.Now, the 4th switching tube Q
h4with the tenth switching tube Q
l2conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the 9th switching tube Q
l1turn-off.Electric current is flowed through successively: the 4th switching tube Q
h4the → the three diode D
3the → the three capacitor cell C
3the → the ten switching tube Q
l2→ AC network u
gthe → the second inductance L
2.
As shown in Fig. 9 d, the inverter of the present embodiment is when 12 operation mode, and described inverter is exported positive 0 level.Now, the 4th switching tube Q
h4, the 5th switching tube Q
h5with the tenth switching tube Q
l2conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the 9th switching tube Q
l1turn-off.Electric current is flowed through successively: the 4th switching tube Q
h4the → the five switching tube Q
h5the → the four diode D
4the → the ten switching tube Q
l2→ AC network u
gthe → the second inductance L
2.
As shown in Fig. 9 e, the inverter of the present embodiment is when 13 operation mode, and 3 level are born in described inverter output.Now, the 9th switching tube Q
l1conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the tenth switching tube Q
l2turn-off.Electric current is flowed through successively: the 8th diode D
8the → the first inductance L
1→ AC network u
gthe → the nine switching tube Q
l1the → the second capacitor cell C
2the → the four capacitor cell.
As shown in Fig. 9 f, the inverter of the present embodiment is when 14 operation mode, and 2 level are born in described inverter output.Now, the 8th switching tube Q
h8with the 9th switching tube Q
l1conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 3rd switching tube Q
h3, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7with the tenth switching tube Q
l2turn-off.Electric current is flowed through successively: the second branch road → the first inductance L
1→ AC network u
gthe → the nine switching tube Q
l1the → the second capacitor cell C
2the → the three capacitor cell C
3.
As shown in Fig. 9 g, the inverter of the present embodiment is when 15 operation mode, and 1 level is born in described inverter output.Now, the 3rd switching tube Q
h3with the 9th switching tube Q
l1conducting, the first switching tube Q
h1, second switch pipe Q
h2, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the tenth switching tube Q
l2turn-off.Electric current is flowed through successively: the second diode D
2the → the three switching tube Q
h3the → the first inductance L
1→ AC network u
gthe → the nine switching tube Q
l1the → the second capacitor cell C
2.
As shown in Fig. 9 h, the inverter of the present embodiment is when 16 operation mode, and 0 level is born in described inverter output.Now, second switch pipe Q
h2, the 3rd switching tube Q
h3with the 9th switching tube Q
l1conducting, the first switching tube Q
h1, the 4th switching tube Q
h4, the 5th switching tube Q
h5, the 6th switching tube Q
h6, the 7th switching tube Q
h7, the 8th switching tube Q
h8with the tenth switching tube Q
l2turn-off.Electric current is flowed through successively: the first diode D
1→ second switch pipe Q
h2the → the three switching tube Q
h3the → the first inductance L
1→ AC network u
gthe → the nine switching tube Q
l1.
It should be noted that, at inverter during in above-mentioned eight idle operation modes, the first DC voltage booster circuit 201 and the second DC voltage booster circuit 202 can be always in running order, or the first DC voltage booster circuit 201 is at least in running order when the 9th operation mode, and the second DC voltage booster circuit 202 is at least in running order when 13 operation mode.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. an electrical level inverter, it is characterized in that, described inverter comprises: the first DC voltage booster circuit, the second DC voltage booster circuit, the first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube, the 9th switching tube, the tenth switching tube, the first diode, the second diode, the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the 7th diode, the 8th diode, the first capacitor cell, the second capacitor cell, the 3rd capacitor cell, the 4th capacitor cell, the first inductance and the second inductance,
The first input end of described the first DC voltage booster circuit connect the positive pole of DC power supply, the positive pole of the first end of described the second capacitor cell, described the first diode, the first end of the first end of described the 9th switching tube and the first branch road; Described the first branch road comprises described the 7th switching tube and described the 5th diode of series connection; Wherein, described the 5th diode makes electric current flow to first end from the second end of described the first branch road; The first end of described the 7th switching tube connects the first end of described the first branch road, or the second end of described the 7th switching tube connects the second end of described the first branch road;
The second input of described the first DC voltage booster circuit connect the first output of described the first DC voltage booster circuit, the first output of the second input of described the second DC voltage booster circuit, described the second DC voltage booster circuit, the second end of the second end of described the first capacitor cell, described the second capacitor cell, the negative pole of anodal and described the 3rd diode of the first end of the first end of described the 3rd capacitor cell, described the 4th capacitor cell, described the second diode;
The second output of described the first DC voltage booster circuit connects the negative pole of the first end of described the first capacitor cell, the first end of described the first switching tube and described the 7th diode;
The first input end of described the second DC voltage booster circuit connects negative pole, the second end of described the 3rd capacitor cell, the negative pole of described the 4th diode, the second end of described the tenth switching tube and the first end of the second branch road of described DC power supply; Described the second branch road comprises described the 8th switching tube and described the 6th diode of series connection; Wherein, described the 6th diode makes electric current flow to the second end from the first end of described the second branch road; The first end of described the 8th switching tube connects the first end of described the second branch road, or the second end of described the 8th switching tube connects the second end of described the second branch road;
The second output of described the second DC voltage booster circuit connects the second end, the second end of described the 6th switching tube and the positive pole of described the 8th diode of described the 4th capacitor cell;
The second end of described the first switching tube connects the negative pole of described the first diode and the first end of described second switch pipe;
The second end of described second switch pipe connects the negative pole of described the second diode and the first end of described the 3rd switching tube;
The second end of described the 3rd switching tube connects the first end of the second end of described the second branch road, the negative pole of described the 8th diode and described the first inductance;
The first end of described the 4th switching tube connects the first end of anodal and described second inductance of the second end of described the first branch road, described the 7th diode;
The second end of described the 4th switching tube connects the positive pole of described the 3rd diode and the first end of described the 5th switching tube;
The second end of described the 5th switching tube connects the positive pole of described the 4th diode and the first end of described the 6th switching tube;
The second end of described the 9th switching tube connects the first end of described the tenth switching tube;
The second end of described the first inductance connects the second end of described the second inductance, as the first ac output end of described inverter; The second end of described the 9th switching tube is as the second ac output end of described inverter.
2. inverter according to claim 1, is characterized in that, during described the first switching tube conducting, electric current flows to the second end from the first end of described the first switching tube; During described second switch pipe conducting, electric current flows to the second end from the first end of described second switch pipe; During described the 3rd switching tube conducting, electric current flows to the second end from the first end of described the 3rd switching tube; During described the 4th switching tube conducting, electric current flows to the second end from the first end of described the 4th switching tube; During described the 5th switching tube conducting, electric current flows to the second end from the first end of described the 5th switching tube; During described the 6th switching tube conducting, electric current flows to the second end from the first end of described the 6th switching tube; During described the 7th switching tube conducting, electric current flows to first end from the second end of described the 7th switching tube; During described the 8th switching tube conducting, electric current flows to the second end from the first end of described the 6th switching tube; During described the 9th switching tube conducting, electric current flows to the second end from the first end of described the 6th switching tube; During described the tenth switching tube conducting, electric current flows to the second end from the first end of described the 6th switching tube.
3. inverter according to claim 1, it is characterized in that, described inverter has eight kinds of meritorious operation modes, is respectively the first operation mode, the second operation mode, the 3rd operation mode, the 4th operation mode, the 5th operation mode, the 6th operation mode, the 7th operation mode and the 8th operation mode;
Described inverter is when described the first operation mode, described the first switching tube, described second switch pipe, described the 3rd switching tube and described the tenth switching tube conducting, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the second operation mode, described second switch pipe, described the 3rd switching tube and described the tenth switching tube conducting, described the first switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the 3rd operation mode, described the 3rd switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the 4th operation mode, described the 8th switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the 5th operation mode, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described the 6th operation mode, described the 4th switching tube, described the 5th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described the 7th operation mode, described the 4th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described the 8th operation mode, described the 7th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 8th switching tube and described the tenth switching tube turn-off.
4. inverter according to claim 3, it is characterized in that, the periodic signal of described inverter output is divided into the first period, the second period, the 3rd period, the 4th period, the 5th period, the 6th period, the 7th period, the 8th period, the 9th period and the tenth period in one-period;
In described the first period and described the 5th period, described inverter is alternately in the 3rd operation mode and the 4th operation mode;
In described the second period and described the 4th period, described inverter is alternately in the second operation mode and the 3rd operation mode;
In described the 3rd period, described inverter is alternately in the first operation mode and the second operation mode;
In described the 6th period and described the tenth period, described inverter is alternately in the 7th operation mode and the 8th operation mode;
In described the 7th period and described the 9th period, described inverter is alternately in the 6th operation mode and the 7th operation mode;
In described the 8th period, described inverter is alternately in the 5th operation mode and the 6th operation mode.
5. inverter according to claim 1, it is characterized in that, described inverter has eight kinds of idle operation modes, is respectively the 9th operation mode, the tenth operation mode, the 11 operation mode, the 12 operation mode, the 13 operation mode, the 14 operation mode, the 15 operation mode and the 16 operation mode;
Described inverter is when described the 9th operation mode, described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described the tenth operation mode, described the 7th switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described 11 operation mode, described the 4th switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 7th switching tube, described the 5th switching tube, described the 6th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described 12 operation mode, described the 4th switching tube, described the 5th switching tube and described the tenth switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 7th switching tube, described the 6th switching tube, described the 8th switching tube and described the 9th switching tube turn-off;
Described inverter is when described 13 operation mode, described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described 14 operation mode, described the 8th switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 3rd switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube and described the tenth switching tube turn-off;
Described inverter is when described 15 operation mode, described the 3rd switching tube and described the 9th switching tube conducting, described the first switching tube, described second switch pipe, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off;
Described inverter is when described 16 operation mode, described second switch pipe, described the 3rd switching tube and described the 9th switching tube conducting, described the first switching tube, described the 4th switching tube, described the 5th switching tube, described the 6th switching tube, described the 7th switching tube, described the 8th switching tube and described the tenth switching tube turn-off.
6. according to the inverter described in claim 1 to 5 any one, it is characterized in that, described first ac output end of described inverter and described the second ac output end are connected in parallel on the two ends of AC network, and the two ends of described AC network are parallel filtering electric capacity also.
7. according to the inverter described in claim 1 to 5 any one, it is characterized in that, described first ac output end of described inverter and described the second ac output end are connected in parallel on the former limit of transformer, the secondary AC network in parallel of described transformer.
8. according to the inverter described in claim 1 to 5 any one, it is characterized in that, described the first DC voltage booster circuit comprises the 3rd inductance, the 9th diode and the 11 switching tube;
The first end of described the 3rd inductance is the first input end of described the first DC voltage booster circuit; The second end of described the 3rd inductance connects the first end of described the 11 switching tube and the positive pole of described the 9th diode;
The second end of described the 11 switching tube is the first output and second input of described the first DC voltage booster circuit;
The negative pole of described the 9th diode is the second output of described the first DC voltage booster circuit.
9. according to the inverter described in claim 1 to 5 any one, it is characterized in that, described the second DC voltage booster circuit comprises the 4th inductance, the tenth diode and twelvemo pass pipe;
The first end of described the 4th inductance is the first input end of described the second DC voltage booster circuit; The second end of described the 4th inductance connects described twelvemo and closes the second end of pipe and the negative pole of described the tenth diode;
The first end that described twelvemo is closed pipe is the first output and second input of described the second DC voltage booster circuit;
The second output of just very described second DC voltage booster circuit of described the tenth diode.
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| CN112564529A (en) * | 2020-12-09 | 2021-03-26 | 广东工业大学 | Boost seven-level inverter |
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