CN102882411B - Single-phase seven-level inverter - Google Patents
Single-phase seven-level inverter Download PDFInfo
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- CN102882411B CN102882411B CN201210421041.9A CN201210421041A CN102882411B CN 102882411 B CN102882411 B CN 102882411B CN 201210421041 A CN201210421041 A CN 201210421041A CN 102882411 B CN102882411 B CN 102882411B
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Abstract
The invention discloses a single-phase seven-level inverter and an application circuit thereof. The single-phase seven-level inverter comprises two direct current power supplies, two boosted circuits, ten switching tubes, and eight diodes. With respect to the phenomenon that voltage-sharing measures and a large filter need to be adopted in the prior art to prevent the problems of large size, increased cost, much loss and low efficiency of the inverter, resulting from overvoltage across the diode; and compared with the prior art, the numbers of diodes, the switching tubes and capacitance devices are greatly reduced relative to the traditional diode clamping and flying capacitor multi-level topology. While a channel is provided for the current, small size, same time small loss and high efficiency of the whole inverter are ensured at the same time; and meanwhile, the boosted circuits widen the voltage input range, and are applicable to situations with a higher voltage.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly single-phase seven electrical level inverters of one.
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, and it is mainly used in big-and-middle three-phase inverter.
It is the diode clamping type five-electrical level inverter topology provided in prior art see figure l, this figure.
In the structure of the five-electrical level inverter of the diode clamping type of figure shown in l, diode DB1, DB2, DB3, DB4, DB5 and DB6 are clamped formula diode, and its effect is for electric current provides path and protection electric capacity not to be shorted.Such as, the first diode DB1 is used for clamped for the current potential of the switch transistor T l lower end lower end in the first electric capacity Cl; Second diode DB2 is used for clamped for the current potential of the switch transistor T 5 lower end lower end in the first electric capacity Cl; DB3, DB4, DB5 and DB6 are similar for other diodes, do not repeat them here.
But; be reached for the object that electric current provides path and protection electric capacity not to be shorted; clamped formula diode then needs to block many times of level voltages; the clamped formula Diode series of usual needs multiple same nominal value; but based on the clamped dispersiveness of formula diode and the impact of stray parameter; the pressure that the clamped formula diode that nominal value is identical can bear also difference to some extent, be together in series the clamped formula diode two ends overvoltage that may cause and have like this.Therefore, need all to press measure and very large RC(phase-shift circuit) absorbing circuit, but long-pending huge like this by the inductance that causes in inverter and filter capacitor, cost increases.
Summary of the invention
In view of this, the application provides a kind of single-phase seven electrical level inverters, the technical problem that five-electrical level inverter systems bulky and cost in order to solve existing diode clamping type are higher.
A kind of single-phase seven electrical level inverters, is characterized in that, comprising:
First DC source of series connection and the second DC source;
Input is connected in parallel on first booster circuit at described first DC source two ends;
Input is connected in parallel on second booster circuit at described second DC source two ends;
First electric capacity of connecting successively, the second electric capacity, the 3rd electric capacity and the 4th electric capacity; Described first electric capacity is connected with the positive pole of the first DC source with the common port of the second electric capacity; Described second electric capacity is connected with the negative pole of the first DC source with the first output of described first booster circuit, the second output of the second booster circuit respectively with the common port of the 3rd electric capacity; Described 3rd electric capacity is connected with the negative pole of the second DC source with the common port of the 4th electric capacity; One end that described first electric capacity does not connect the second electric capacity is connected with the second output of described first booster circuit; One end that described 4th electric capacity does not connect the 3rd electric capacity is connected with the first output of described second booster circuit;
The first diode that anode is connected with the common port of the second electric capacity with described first electric capacity, the anode of described first diode is connected with the input of the first switching tube;
The second diode that anode is connected with the common port of the 3rd electric capacity with described second electric capacity, the negative electrode of described second diode is connected with the input of second switch pipe;
The 3rd diode that negative electrode is connected with the common port of the 3rd electric capacity with described second electric capacity, the anode of described 3rd diode is connected with the input of the 3rd switching tube;
The 4th diode that negative electrode is connected with the common port of the 4th electric capacity with described 3rd electric capacity, the anode of described 4th diode is connected with the input of the 4th switching tube;
The 5th switching tube that output is connected with described first diode anode, the input of described 5th switching tube is connected with the output of the 6th switching tube, and the input of described 6th switching tube is connected with the negative electrode of described 4th diode;
The 7th switching tube that input is connected with described 5th switching tube output, the output of described 7th switching tube is connected to the negative electrode of the 5th diode, and the anode of described 5th diode is connected with the output of the output of the 3rd switching tube, the 4th switching tube;
The 8th switching tube that input is connected with described 6th switching tube input, the output of described 8th switching tube is connected to the anode of the 6th diode, and the negative electrode of described 6th diode is connected with the output of second switch pipe, the output of the first switching tube;
The 9th switching tube that output is connected with the second output of described first booster circuit, the input of described 9th switching tube is connected with the negative electrode of the 7th diode, and the anode of described 7th diode is connected with the first output of described second booster circuit;
The tenth switching tube that output is connected with the first output of described second booster circuit, the output of described tenth switching tube is connected with the anode of the 8th diode, and the negative electrode of described 8th diode is connected with the second output of described first booster circuit.
Preferably, described switching tube is MOS (metal-oxide-semiconductor) transistor or technotron or insulated gate bipolar transistor;
When described switching tube be MOS (metal-oxide-semiconductor) transistor pipe or technotron time, the input of described switching tube is source electrode, and described output is drain electrode, described in the open the light control end of pipe be grid;
When described switching tube is insulated gate bipolar transistor, the first end of described switching tube is collector electrode, described in open the light the second end of pipe be emitter, described control end is base stage.
Preferably, described diode is silicon carbide diode or fast recovery diode or supper-fast recovery diode.
Preferably, the filtering of single-phase seven electrical level inverters net unit comprise: the first inductance, the second inductance and filter capacitor, wherein:
Filter capacitor first end is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of filter capacitor with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube.
Preferably, the control end of described 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 and the tenth switching tube is connected with control chip, and described control chip controls described single-phase seven electrical level inverters and realizes eight kinds of meritorious operation modes:
When being in first mode, described control chip controls described 9th switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in second mode, described control chip controls described first switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in the 3rd mode, described control chip controls described second switch pipe and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in the 4th mode, described control chip controls described 6th switching tube and the 8th switching tube conducting, and rest switch pipe is cut-off;
When being in the 5th mode, described control chip controls described 3rd switching tube and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in the 6th mode, described control chip controls described 4th switching tube and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in the 7th mode, described control chip controls described 5th switching tube and the tenth switching tube conducting, and rest switch pipe is cut-off;
When being in the 8th mode, described control chip controls described 5th switching tube and the 7th switching tube conducting, and rest switch pipe is cut-off.
Preferably, described control chip controls described single-phase seven electrical level inverters and realizes eight kinds of idle operation modes:
When being in the 9th mode, described control chip controls described 4th switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in the tenth mode, described control chip controls described 3rd switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in 11 mode, described control chip controls described 7th switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in 12 mode, described control chip controls described 6th switching tube conducting, and rest switch pipe is cut-off;
When being in 13 mode, described control chip controls described first switching tube and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in 14 mode, described control chip controls described 8th switching tube and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in 15 mode, described control chip controls described second switch pipe and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in 16 mode, described control chip controls described 5th switching tube conducting, and rest switch pipe is cut-off.
Preferably, the filtering of described single-phase seven electrical level inverters net unit comprise: the first inductance, the second inductance, filter capacitor and and isolating transformer, wherein:
The first end of isolating transformer primary coil is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of isolating transformer primary coil with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube;
Two terminals of filter capacitor are connected with two terminals of isolating transformer secondary coil respectively.
A kind of single-phase seven level inverse conversion unit, is characterized in that, be applied to single-phase seven electrical level inverters, comprise:
First electric capacity of connecting successively, the second electric capacity, the 3rd electric capacity and the 4th electric capacity; Described first electric capacity is connected with the positive pole of the first DC source with the common port of the second electric capacity; Described second electric capacity is connected with the negative pole of the first DC source with the common port of the 3rd electric capacity; Described 3rd electric capacity is connected with the negative pole of the second DC source with the common port of the 4th electric capacity; The first diode that anode is connected with the common port of the second electric capacity with described first electric capacity, the anode of described first diode is connected with the input of the first switching tube;
The second diode that anode is connected with the common port of the 3rd electric capacity with described second electric capacity, the negative electrode of described second diode is connected with the input of second switch pipe;
The 3rd diode that negative electrode is connected with the common port of the 3rd electric capacity with described second electric capacity, the anode of described 3rd diode is connected with the input of the 3rd switching tube;
The 4th diode that negative electrode is connected with the common port of the 4th electric capacity with described 3rd electric capacity, the anode of described 4th diode is connected with the input of the 4th switching tube;
The 5th switching tube that output is connected with described first diode anode, the input of described 5th switching tube is connected with the output of the 6th switching tube, and the input of described 6th switching tube is connected with the negative electrode of described 4th diode;
The 7th switching tube that input is connected with described 5th switching tube output, the output of described 7th switching tube is connected to the negative electrode of the 5th diode, and the anode of described 5th diode is connected with the output of the output of the 3rd switching tube, the 4th switching tube;
The 8th switching tube that input is connected with described 6th switching tube input, the output of described 8th switching tube is connected to the anode of the 6th diode, and the negative electrode of described 6th diode is connected with the output of second switch pipe, the output of the first switching tube;
The 9th switching tube that output is not connected the second electric capacity one end with described first electric capacity is connected, the input of described 9th switching tube is connected with the negative electrode of the 7th diode, and the anode of described 7th diode is not connected the 3rd electric capacity one end with the 4th electric capacity is connected;
The tenth switching tube that output is not connected the 3rd electric capacity one end with described 4th electric capacity is connected, the output of described tenth switching tube is connected with the anode of the 8th diode, and the negative electrode of described 8th diode is not connected the second electric capacity one end with described first electric capacity is connected.
Preferably, the filtering of described single-phase seven level inverse conversion unit net unit comprise: the first inductance, the second inductance and filter capacitor, wherein:
Filter capacitor first end is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of filter capacitor with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube.
Preferably, the filtering of described single-phase seven level inverse conversion unit net unit comprise: the first inductance, the second inductance, filter capacitor and isolating transformer, wherein:
The first end of isolating transformer primary coil is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of filter isolating transformer primary coil with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube;
Two terminals of filter capacitor are connected with two terminals of isolating transformer secondary coil respectively.
Preferably, single-phase seven level inverse conversion unit also comprise:
Input is connected in parallel on first booster circuit at the first DC source two ends;
Input is connected in parallel on second booster circuit at the second DC source two ends;
First output of described first booster circuit is connected with the common port of described second electric capacity with the 3rd electric capacity with the second output of the second booster circuit; Second output of the first booster circuit is connected with the output of the 9th switching tube; First output of the second booster circuit is connected with the input of the tenth switching tube.
The clamped formula diode used in diode clamping type five-electrical level inverter in prior art is not comprised, to solve existing diode clamping type five-electrical level inverter systems bulky and the higher technical problem of cost by the known the present invention of such scheme.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The five-electrical level inverter topology that Fig. 1 is the diode clamping type that provides in prior art;
The circuit diagram of Fig. 2 a kind of single-phase seven electrical level inverters disclosed in the embodiment of the present invention;
Fig. 3 is in the circuit diagram of the first meritorious mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Fig. 4 is in the circuit diagram of the second meritorious mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Fig. 5 is in the circuit diagram of the 3rd meritorious mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Fig. 6 is in the circuit diagram of the 4th meritorious mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Fig. 7 is in the circuit diagram of the 5th meritorious mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Fig. 8 is in the circuit diagram of the 6th meritorious mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Fig. 9 is in the circuit diagram of the 7th meritorious mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 10 is in the circuit diagram of the 8th meritorious mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 11 is the output voltage variation diagram that single-phase seven electrical level inverters are not corresponding in the same time;
Figure 12 is in the circuit diagram of the 9th idle mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 13 is in the circuit diagram of the tenth idle mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 14 is in the circuit diagram of the 11 idle mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 15 is in the circuit diagram of the 12 idle mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 16 is in the circuit diagram of the 13 idle mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 17 is in the circuit diagram of the 14 idle mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 18 is in the circuit diagram of the 15 idle mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 19 is in the circuit diagram of the 16 idle mode for single-phase seven electrical level inverters that the embodiment of the present invention provides;
Figure 20 is the circuit diagram of this figure a kind of its electrical level inverter single-phase disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 2, a kind of single-phase seven electrical level inverters disclosed in the embodiment of the present invention, comprising:
First DC source DC of series connection
1with the second DC source DC
2;
Input is connected in parallel on described first DC source DC
1the first booster circuit Boost1 at two ends;
Input is connected in parallel on described second DC source DC
2the second booster circuit Boost2 at two ends;
The the first electric capacity C connected successively
1, the second electric capacity C
2, the 3rd electric capacity C
3with the 4th electric capacity C
4; Described first electric capacity C
1with the second electric capacity C
2common port and the first DC source DC
1positive pole be connected; Described second electric capacity C
2with the 3rd electric capacity C
3common port be connected with the negative pole of the first DC source with first output of described first booster circuit Boost1, second output of the second booster circuit Boost2 respectively; Described 3rd electric capacity C
3with the 4th electric capacity C
4common port and the second DC source DC
2negative pole be connected; Described first electric capacity C
1do not connect the second electric capacity C
2one end be connected with second output of described first booster circuit Boost1; Described 4th electric capacity C
4do not connect the 3rd electric capacity C
3one end be connected with first output of described second booster circuit Boost2;
Anode and described first electric capacity C
1with the second electric capacity C
2common port be connected the first diode D
1, described first diode D
1anode be connected with the first switching tube Q
h1input;
Anode and described second electric capacity C
2with the 3rd electric capacity C
3common port be connected the second diode D
2, described second diode D
2negative electrode be connected with second switch pipe Q
h2input;
Negative electrode and described second electric capacity C
2with the 3rd electric capacity C
3common port be connected the 3rd diode D
3, described 3rd diode D
3anode be connected with the 3rd switching tube Q
h3input;
Negative electrode and described 3rd electric capacity C
3with the 4th electric capacity C
4common port be connected the 4th diode D
4, described 4th diode D
4anode be connected with the 4th switching tube Q
h4input;
Output and described first diode D
1the 5th switching tube Q that anode is connected
l5, described 5th switching tube Q
l5input be connected with the 6th switching tube Q
l6output, described 6th switching tube Q
l6input and described 4th diode D
4negative electrode be connected;
Input and described 5th switching tube Q
l5the 7th switching tube Q that output is connected
h7, described 7th switching tube Q
h7output be connected to the 5th diode D
5negative electrode, described 5th diode D
5anode and the 3rd switching tube Q
h3output, the 4th switching tube Q
h4output be connected;
Input and described 6th switching tube Q
l6the 8th switching tube Q that input is connected
h8, described 8th switching tube Q
h8output be connected to the 6th diode D
6anode, described 6th diode D
6negative electrode and second switch pipe Q
h2output, the first switching tube Q
h1output be connected;
The 9th switching tube Q that output is connected with second output of described first booster circuit Boost1
h9, described 9th switching tube Q
h9input be connected with the 7th diode D
7negative electrode, described 7th diode D
7anode be connected with first output of described second booster circuit Boost2;
The tenth switching tube Q that output is connected with first output of described second booster circuit Boost2
h10, described tenth switching tube Q
h10output be connected with the 8th diode D
8anode, described 8th diode D
8negative electrode be connected with second output of described first booster circuit Boost1.
The single-phase seven electrical level inverter topologys that the present embodiment provides comprise two DC power supply; two Boost circuit; ten switching tubes and eight diodes; the switching tube conducting different with control by the metering function of diode just can provide path and protection electric capacity not to be shorted for electric current; cast out the clamped formula diode used in prior art; reach the object reducing inverter volume; and add Boost circuit due to prime; input voltage range is broadened, the more high-tension occasion of applicable input.
It should be noted that, switching tube can be MOS (metal-oxide-semiconductor) transistor or technotron or insulated gate bipolar transistor;
When described switching tube be MOS (metal-oxide-semiconductor) transistor or technotron time, the input of described switching tube is source electrode, and described output is drain electrode, described in the open the light control end of pipe be grid;
When described switching tube is insulated gate bipolar transistor, the input of described switching tube is collector electrode, described in the open the light output of pipe be emitter, described control end is base stage.Be understandable that above eight switching tubes also can select the switching tube of other types.
It should be noted that, described diode is silicon carbide diode or fast recovery diode or supper-fast recovery diode.Be understandable that, described diode also can select the diode of other types.
It should be noted that, in other embodiments of the invention, the filtering that single-phase seven electrical level inverters comprise net unit, as shown in Figure 2, comprising: the first inductance L
1, the second inductance L
2, filter capacitor C
0, wherein:
Filter capacitor C
0first end and the 5th switching tube Q
l5input is connected;
First inductance L
1with the second inductance L
2be in series;
First inductance L
1with the second inductance L
2common port and filter capacitor C
0the second end be connected, the first inductance L
1not with the second inductance L
2the one end be connected and second switch pipe Q
h3output be connected; Second inductance L
2not with the first inductance L
1the one end be connected and the 3rd switching tube Q
h4output be connected.
In above-mentioned two embodiments of the present invention, the first described 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
l5, the 6th switching tube Q
l6, the 7th switching tube Q
h7, the 8th switching tube Q
h89th switching tube Q
h9with the tenth switching tube Q
h10control end be connected with control chip, described control chip controls described single-phase seven electrical level inverters and realizes eight kinds of meritorious operation modes, and each operation mode only has at most two switching tube conductings.
In order to clearly demonstrate eight meritorious operation modes of single-phase seven electrical level inverters described in the embodiment of the present invention, below in conjunction with accompanying drawing, eight operation modes are described in detail.
See Fig. 3, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the first meritorious mode.
When being in first mode, described control chip controls described 9th switching tube Q
h9with the 6th switching tube Q
l6conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h9-L
1-u
g-Q
l6-C
3-C
2-C
1-Q
h9.
See Fig. 4, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the second meritorious mode.
When being in second mode, described control chip controls described first switching tube Q
h1with the 6th switching tube Q
l6conducting, rest switch pipe is cut-off;
The trend of electric current is D
2-Q
h1-L
1-u
g-Q
l6-C
3-C
2-D
2.
See Fig. 5, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 3rd meritorious mode.
When being in the 3rd mode, described control chip controls described second switch pipe Q
h2with the 6th switching tube Q
l6conducting, rest switch pipe is cut-off;
The trend of electric current is D
2-Q
h2-L
1-u
g-Q
l6-C
3-D
2.
See Fig. 6, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 4th meritorious mode.
When being in the 4th mode, described control chip controls described 6th switching tube Q
l6with the 8th switching tube Q
h8conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h8-D
6-L
1-u
g-Q
l6-Q
h8.
See Fig. 7, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 5th meritorious mode.
When being in the 5th mode, described control chip controls described 3rd switching tube Q
h3with the 5th switching tube Q
l5conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h3-D
3-C
2-u
g-L
2-Q
h3.
See Fig. 8, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 6th meritorious mode.
When being in the 6th mode, described control chip controls described 4th switching tube Q
h4with the 5th switching tube Q
l5conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h4-D
4-C
3-C
2-Q
l5-u
g-L
2-Q
h4.
See Fig. 9, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 7th meritorious mode.
When being in the 7th mode, described control chip controls described 5th switching tube Q
l5with the tenth switching tube Q
h10conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h10-C
4-C
3-C
2-Q
l5-u
g-L
2-Q
h10.
See Figure 10, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 8th meritorious mode.
When being in the 8th mode, described control chip controls described 5th switching tube Q
l5with the 7th switching tube Q
h7conducting, rest switch pipe is cut-off.
The trend of electric current is Q
l5-u
g-L
2-D
5-Q
h7-Q
l5.
Wherein u
gfor load.
As shown in figure 11, this figure is the output voltage variation diagram that single-phase seven electrical level inverters are not corresponding in the same time.
When inverter works in meritorious mode, control chip control inverter realizes the switching between different modalities, and output voltage also changes along with the change of inverter operation mode:
T
0-t
1in time period, described single-phase seven electrical level inverters of described control chip control become the 3rd mode from the 4th mode, and output voltage becomes U from output voltage 0
1.
T
1-t
2in time period, described single-phase seven electrical level inverters of described control chip control become second mode from the 3rd mode, and output voltage is by U
1become U
2.
T
2-t
3in time period, described single-phase seven electrical level inverters of described control chip control become first mode from second mode, and output voltage is by U
2become U
3.
T in other times section
3-t
4, t
4-t
5, t
5-t
6, t
6-t
7, t
7-t
8, t
8-t
9, t
9-t
10, t
10-t
11and t
11-t
12described control chip controls described single-phase seven electrical level inverter Mode variations and output voltage change is similar, does not repeat them here.
In order to clearly demonstrate eight idle operation modes of single-phase seven electrical level inverters described in the embodiment of the present invention, below in conjunction with accompanying drawing, eight kinds of idle operation modes are described in detail.
See Figure 12, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 9th idle mode.
When being in the 9th mode, described control chip controls described 4th switching tube Q
h4with the 6th switching tube Q
l6conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h4-D
4-Q
l6-u
g-L
2-Q
h4.
See Figure 13, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the tenth idle mode.
When being in the tenth mode, described control chip controls described 3rd switching tube Q
h3with the 6th switching tube Q
l6conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h3-D
3-C
3-Q
l6-u
g-L
2-Q
h3.
See Figure 14, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 11 idle mode.
When being in 11 mode, described control chip controls described 7th switching tube Q
h7with the 6th switching tube Q
l6conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h7-C
2-C
3-Q
l6-u
g-L
2-D
5-Q
h7.
See Figure 15, single-phase seven electrical level inverters that the embodiment of the present invention provides are in the circuit diagram of the 12 idle mode.
When being in 12 mode, described control chip controls described 6th switching tube Q
l6conducting, rest switch pipe is cut-off;
The trend of electric current is Q
l6-u
g-L
2-D
8-C
1-C
2-C
3-Q
l6.
See Figure 16, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 13 idle mode.
When being in 13 mode, described control chip controls described first switching tube Q
h1with the 5th switching tube Q
l5conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h1-L
1-u
g-Q
l5-D
1-Q
h1.
See Figure 17, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 14 idle mode.
When being in 14 mode, described control chip controls described 8th switching tube Q
h8with the 5th switching tube Q
l5conducting, rest switch pipe is cut-off;
The trend of electric current is Q
h8-D
6-L
1-u
g-Q
l5-C
2-C
3-Q
h8.
See Figure 18, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 15 idle mode.
When being in 15 mode, described control chip controls described second switch pipe Q
h2with the 5th switching tube Q
l5conducting, rest switch pipe is cut-off;
The trend of electric current is D
2-Q
h2-L
1-u
g-Q
l5-C
2-D
2.
See Figure 19, this figure is the circuit diagram that single-phase seven electrical level inverters that the embodiment of the present invention provides are in the 16 idle mode.
When being in 16 mode, described control chip controls described 5th switching tube Q
l5conducting, rest switch pipe is cut-off;
The trend of electric current is D
7-L
1-u
g-Q
l5-C
2-C
3-C
4-D
7.
See Figure 20, the circuit diagram of this figure a kind of single-phase seven electrical level inverters disclosed in the embodiment of the present invention.
When high frequency switches, in order to prevent common mode leakage problem, the filtering of described single-phase seven electrical level inverters net unit comprise: the first inductance L
1, the second inductance L
2, filter capacitor C
0and isolating transformer, wherein:
The first end of isolating transformer primary coil and the 5th switching tube Q
l5input is connected;
First inductance L
1with the second inductance L
2be in series;
First inductance L
1with the second inductance L
2common port be connected with the second end of isolating transformer primary coil, the first inductance L
1not with the second inductance L
2the one end be connected and second switch pipe Q
h2output be connected; Second inductance L
2not with the first inductance L
1the one end be connected and the 3rd switching tube Q
h3output be connected;
Filter capacitor C
0two terminals be connected with two terminals of isolating transformer secondary coil respectively.
Be understandable that, when high frequency switches, in order to prevent the present invention from can produce common mode leakage problem, described filtering net unit also can comprise the RC circuit of connecting with filter capacitor.
The single-phase seven level inverse conversion unit of one disclosed by the invention, are applied to single-phase seven electrical level inverters, comprise:
First electric capacity of connecting successively, the second electric capacity, the 3rd electric capacity and the 4th electric capacity; Described first electric capacity is connected with the positive pole of the first DC source with the common port of the second electric capacity; Described second electric capacity is connected with the negative pole of the first DC source with the common port of the 3rd electric capacity; Described 3rd electric capacity is connected with the negative pole of the second DC source with the common port of the 4th electric capacity; The first diode that anode is connected with the common port of the second electric capacity with described first electric capacity, the anode of described first diode is connected with the input of the first switching tube;
The second diode that anode is connected with the common port of the 3rd electric capacity with described second electric capacity, the negative electrode of described second diode is connected with the input of second switch pipe;
The 3rd diode that negative electrode is connected with the common port of the 3rd electric capacity with described second electric capacity, the anode of described 3rd diode is connected with the input of the 3rd switching tube;
The 4th diode that negative electrode is connected with the common port of the 4th electric capacity with described 3rd electric capacity, the anode of described 4th diode is connected with the input of the 4th switching tube;
The 5th switching tube that output is connected with described first diode anode, the input of described 5th switching tube is connected with the output of the 6th switching tube, and the input of described 6th switching tube is connected with the negative electrode of described 4th diode;
The 7th switching tube that input is connected with described 5th switching tube output, the output of described 7th switching tube is connected to the negative electrode of the 5th diode, and the anode of described 5th diode is connected with the output of the output of the 3rd switching tube, the 4th switching tube;
The 8th switching tube that input is connected with described 6th switching tube input, the output of described 8th switching tube is connected to the anode of the 6th diode, and the negative electrode of described 6th diode is connected with the output of second switch pipe, the output of the first switching tube;
The 9th switching tube that output is not connected the second electric capacity one end with described first electric capacity is connected, the input of described 9th switching tube is connected with the negative electrode of the 7th diode, and the anode of described 7th diode is not connected the 3rd electric capacity one end with the 4th electric capacity is connected;
The tenth switching tube that output is not connected the 3rd electric capacity one end with described 4th electric capacity is connected, the output of described tenth switching tube is connected with the anode of the 8th diode, and the negative electrode of described 8th diode is not connected the second electric capacity one end with described first electric capacity is connected.
It should be noted that, the switching tube in this single-phase seven level inverse conversion unit can be MOS (metal-oxide-semiconductor) transistor or technotron or insulated gate bipolar transistor;
When described switching tube be MOS (metal-oxide-semiconductor) transistor pipe or technotron time, the input of described switching tube is source electrode, and described output is drain electrode, described in the open the light control end of pipe be grid;
When described switching tube is insulated gate bipolar transistor, the input of described switching tube is collector electrode, described in the open the light output of pipe be emitter, described control end is base stage.Be understandable that described switching tube also can select the switching tube of other types.
It should be noted that, the diode in this single-phase seven level inverse conversion unit is silicon carbide diode or fast recovery diode or supper-fast recovery diode.Be understandable that, described diode also can select the diode of other types.
It should be noted that, in other embodiments of the invention, the filtering that single-phase seven level inverse conversion unit comprise net unit, comprising: the first inductance, the second inductance and filter capacitor, wherein:
Filter capacitor first end is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of filter capacitor with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube.
It should be noted that, in other embodiments of the present invention seven level inverse conversion unit, the filtering of described single-phase seven level inverse conversion unit net unit comprise: the first inductance, the second inductance, filter capacitor and isolating transformer, wherein:
The first end of isolating transformer primary coil is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of filter isolating transformer primary coil with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube;
Two terminals of filter capacitor are connected with two terminals of isolating transformer secondary coil respectively.
Be understandable that, when high frequency switches, in order to prevent the present invention from can produce common mode leakage problem, described filtering net unit also can comprise the RC circuit of connecting with filter capacitor.
It should be noted that described single-phase seven level inverse conversion unit also comprise:
Input is connected in parallel on first booster circuit at the first DC source two ends;
Input is connected in parallel on second booster circuit at the second DC source two ends;
First output of described first booster circuit is connected with the common port of described second electric capacity with the 3rd electric capacity with the second output of the second booster circuit; Second output of the first booster circuit is connected with the output of the 9th switching tube; First output of the second booster circuit is connected with the input of the tenth switching tube.
As can be seen from the above embodiments, compared with five Level Technology of prior art, level number of the present invention is more, the voltage change ratio of switching tube and inductance is less, and described single-phase seven electrical level inverters have at most the conducting simultaneously of two switching tubes at different modalities, switching loss and magnetic element loss less, and, due to increasing of level number, the current ripples that single-phase seven electrical level inverters of the present invention export reduces, grid current harmonic content reduces, and the body volume of the filter in inverter is obviously reduced, and the cost of inverter reduces.And add Boost circuit in the present invention, make the scope of input voltage wider, the occasion of applicable input more high pressure.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. single-phase seven electrical level inverters, is characterized in that, comprising:
First DC source of series connection and the second DC source;
Input is connected in parallel on first booster circuit at described first DC source two ends;
Input is connected in parallel on second booster circuit at described second DC source two ends;
First electric capacity of connecting successively, the second electric capacity, the 3rd electric capacity and the 4th electric capacity; Described first electric capacity is connected with the positive pole of the first DC source with the common port of the second electric capacity; Described second electric capacity is connected with the negative pole of the first DC source with the first output of described first booster circuit, the second output of the second booster circuit respectively with the common port of the 3rd electric capacity; Described 3rd electric capacity is connected with the negative pole of the second DC source with the common port of the 4th electric capacity; One end that described first electric capacity does not connect the second electric capacity is connected with the second output of described first booster circuit; One end that described 4th electric capacity does not connect the 3rd electric capacity is connected with the first output of described second booster circuit;
The first diode that anode is connected with the common port of the second electric capacity with described first electric capacity, the anode of described first diode is connected with the input of the first switching tube;
The second diode that anode is connected with the common port of the 3rd electric capacity with described second electric capacity, the negative electrode of described second diode is connected with the input of second switch pipe;
The 3rd diode that negative electrode is connected with the common port of the 3rd electric capacity with described second electric capacity, the anode of described 3rd diode is connected with the input of the 3rd switching tube;
The 4th diode that negative electrode is connected with the common port of the 4th electric capacity with described 3rd electric capacity, the anode of described 4th diode is connected with the input of the 4th switching tube;
The 5th switching tube that output is connected with described first diode anode, the input of described 5th switching tube is connected with the output of the 6th switching tube, and the input of described 6th switching tube is connected with the negative electrode of described 4th diode;
The 7th switching tube that input is connected with described 5th switching tube output, the output of described 7th switching tube is connected to the negative electrode of the 5th diode, and the anode of described 5th diode is connected with the output of the output of the 3rd switching tube, the 4th switching tube;
The 8th switching tube that input is connected with described 6th switching tube input, the output of described 8th switching tube is connected to the anode of the 6th diode, and the negative electrode of described 6th diode is connected with the output of second switch pipe, the output of the first switching tube;
The 9th switching tube that output is connected with the second output of described first booster circuit, the input of described 9th switching tube is connected with the negative electrode of the 7th diode, and the anode of described 7th diode is connected with the first output of described second booster circuit;
The tenth switching tube that output is connected with the first output of described second booster circuit, the output of described tenth switching tube is connected with the anode of the 8th diode, and the negative electrode of described 8th diode is connected with the second output of described first booster circuit.
2. single-phase seven electrical level inverters according to claim 1, is characterized in that, described diode is silicon carbide diode or fast recovery diode or supper-fast recovery diode.
3. single-phase seven electrical level inverters according to claim 1, is characterized in that, the filtering of single-phase seven electrical level inverters net unit comprise: the first inductance, the second inductance and filter capacitor, wherein:
Filter capacitor first end is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of filter capacitor with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube.
4. single-phase seven electrical level inverters according to claim 1-3 any one, it is characterized in that, the control end of described 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 and the tenth switching tube is connected with control chip, and described control chip controls described single-phase seven electrical level inverters and realizes eight kinds of meritorious operation modes:
When being in first mode, described control chip controls described 9th switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in second mode, described control chip controls described first switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in the 3rd mode, described control chip controls described second switch pipe and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in the 4th mode, described control chip controls described 6th switching tube and the 8th switching tube conducting, and rest switch pipe is cut-off;
When being in the 5th mode, described control chip controls described 3rd switching tube and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in the 6th mode, described control chip controls described 4th switching tube and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in the 7th mode, described control chip controls described 5th switching tube and the tenth switching tube conducting, and rest switch pipe is cut-off;
When being in the 8th mode, described control chip controls described 5th switching tube and the 7th switching tube conducting, and rest switch pipe is cut-off.
5. single-phase seven electrical level inverters according to claim 4, is characterized in that, described control chip controls described single-phase seven electrical level inverters and realizes eight kinds of idle operation modes:
When being in the 9th mode, described control chip controls described 4th switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in the tenth mode, described control chip controls described 3rd switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in 11 mode, described control chip controls described 7th switching tube and the 6th switching tube conducting, and rest switch pipe is cut-off;
When being in 12 mode, described control chip controls described 6th switching tube conducting, and rest switch pipe is cut-off;
When being in 13 mode, described control chip controls described first switching tube and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in 14 mode, described control chip controls described 8th switching tube and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in 15 mode, described control chip controls described second switch pipe and the 5th switching tube conducting, and rest switch pipe is cut-off;
When being in 16 mode, described control chip controls described 5th switching tube conducting, and rest switch pipe is cut-off.
6. single-phase seven electrical level inverters according to claim 1, is characterized in that, the filtering of single-phase seven electrical level inverters net unit comprise: the first inductance, the second inductance, filter capacitor and and isolating transformer, wherein:
The first end of isolating transformer primary coil is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of isolating transformer primary coil with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube;
Two terminals of filter capacitor are connected with two terminals of isolating transformer secondary coil respectively.
7. single-phase seven level inverse conversion unit, is characterized in that, are applied to single-phase seven electrical level inverters, comprise:
First electric capacity of connecting successively, the second electric capacity, the 3rd electric capacity and the 4th electric capacity; Described first electric capacity is connected with the positive pole of the first DC source with the common port of the second electric capacity; Described second electric capacity is connected with the negative pole of the first DC source with the common port of the 3rd electric capacity; Described 3rd electric capacity is connected with the negative pole of the second DC source with the common port of the 4th electric capacity; The first diode that anode is connected with the common port of the second electric capacity with described first electric capacity, the anode of described first diode is connected with the input of the first switching tube;
The second diode that anode is connected with the common port of the 3rd electric capacity with described second electric capacity, the negative electrode of described second diode is connected with the input of second switch pipe;
The 3rd diode that negative electrode is connected with the common port of the 3rd electric capacity with described second electric capacity, the anode of described 3rd diode is connected with the input of the 3rd switching tube;
The 4th diode that negative electrode is connected with the common port of the 4th electric capacity with described 3rd electric capacity, the anode of described 4th diode is connected with the input of the 4th switching tube;
The 5th switching tube that output is connected with described first diode anode, the input of described 5th switching tube is connected with the output of the 6th switching tube, and the input of described 6th switching tube is connected with the negative electrode of described 4th diode;
The 7th switching tube that input is connected with described 5th switching tube output, the output of described 7th switching tube is connected to the negative electrode of the 5th diode, and the anode of described 5th diode is connected with the output of the output of the 3rd switching tube, the 4th switching tube;
The 8th switching tube that input is connected with described 6th switching tube input, the output of described 8th switching tube is connected to the anode of the 6th diode, and the negative electrode of described 6th diode is connected with the output of second switch pipe, the output of the first switching tube;
The 9th switching tube that output is not connected the second electric capacity one end with described first electric capacity is connected, the input of described 9th switching tube is connected with the negative electrode of the 7th diode, and the anode of described 7th diode is not connected the 3rd electric capacity one end with the 4th electric capacity is connected;
The tenth switching tube that output is not connected the 3rd electric capacity one end with described 4th electric capacity is connected, the output of described tenth switching tube is connected with the anode of the 8th diode, and the negative electrode of described 8th diode is not connected the second electric capacity one end with described first electric capacity is connected.
8. single-phase seven level inverse conversion unit according to claim 7, is characterized in that, the filtering of single-phase seven level inverse conversion unit net unit comprise: the first inductance, the second inductance and filter capacitor, wherein:
Filter capacitor first end is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of filter capacitor with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube.
9. single-phase seven level inverse conversion unit according to claim 7, is characterized in that, the filtering of single-phase seven level inverse conversion unit net unit comprise: the first inductance, the second inductance, filter capacitor and isolating transformer, wherein:
The first end of isolating transformer primary coil is connected with the 5th switching tube input;
First inductance and the second inductance are in series;
First inductance is connected with the second end of filter isolating transformer primary coil with the common port of the second inductance, and one end that the first inductance is not connected with the second inductance is connected with the output of second switch pipe; One end that second inductance is not connected with the first inductance is connected with the output of the 3rd switching tube;
Two terminals of filter capacitor are connected with two terminals of isolating transformer secondary coil respectively.
10. single-phase seven level inverse conversion unit according to claim 7, is characterized in that, single-phase seven level inverse conversion unit also comprise:
Input is connected in parallel on first booster circuit at the first DC source two ends;
Input is connected in parallel on second booster circuit at the second DC source two ends;
First output of described first booster circuit is connected with the common port of described second electric capacity with the 3rd electric capacity with the second output of the second booster circuit; Second output of the first booster circuit is connected with the output of the 9th switching tube; First output of the second booster circuit is connected with the input of the tenth switching tube.
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|---|---|---|---|
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| EP2975757A1 (en) | 2014-07-14 | 2016-01-20 | ABB Technology AG | Three-phase transformerless DC to AC inverter |
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| CN201937492U (en) * | 2011-01-14 | 2011-08-17 | 南京师范大学 | Low-voltage seven-level inverter |
| CN102624271B (en) * | 2012-04-01 | 2014-07-16 | 阳光电源股份有限公司 | Five-level inverted topology unit and five-level inverter |
| CN102638191A (en) * | 2012-04-13 | 2012-08-15 | 阳光电源股份有限公司 | Seven-level inversion topology unit and seven-level inverter |
| CN102751895B (en) * | 2012-06-12 | 2014-12-03 | 阳光电源股份有限公司 | Multi-level circuit, grid-connected inverter and modulation method of grid-connected inverter |
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