CN102437766A - Single-phase inverter - Google Patents
Single-phase inverter Download PDFInfo
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- CN102437766A CN102437766A CN2011103282735A CN201110328273A CN102437766A CN 102437766 A CN102437766 A CN 102437766A CN 2011103282735 A CN2011103282735 A CN 2011103282735A CN 201110328273 A CN201110328273 A CN 201110328273A CN 102437766 A CN102437766 A CN 102437766A
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Abstract
The invention discloses a single-phase inverter, which comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube, wherein the positive end of a direct current power supply is connected with the negative end of the direct current power supply through the first, fourth and fifth switching tubes which are sequentially connected in series; the positive end of the direct current power supply is connected with the negative end of the direct current power supply through the second, third and sixth switching tubes which are sequentially connected in series; the second end of the fourth switching tube is connected with the second end of the third switching tube; and an alternating current load is connected between the second end of the first switching tube and the second end of the second switching tube. When the single-phase inverter is applied to a unity power factor place, the third switching tube is reversely connected in parallel with a third diode, and the fourth switching tube is reversely connected in parallel with a fourth diode. In order to solve the technical problem, the invention provides the single-phase inverter. The single-phase inverter adopts a relatively smaller number of semiconductors, and is relatively lower in loss, relatively higher in efficiency and low in cost.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly a kind of single-phase inverter.
Background technology
Single-phase non-isolation type combining inverter, its leakage current are its very important indexs, and method commonly used has the method that adds common-mode filter and the new topological structure of employing.But common-mode filter can increase the volume and weight of equipment.Adopt new topology that Heric is arranged at present, a plurality of topologys such as H6.
Application number is that 200920108583.4 Chinese utility model patent discloses the single-phase non-isolation type combining inverter that adopts the H6 topological structure.Specifically referring to H6 topological structure shown in Figure 1.
Use the diode D7, the D8 that add respectively inductance L 1, L2 to be carried out afterflow in the H6 topological structure that the single-phase non-isolation type combining inverter of this patent adopts.Owing to increased the diode that adds, make semiconductor device increase, cause volume bigger, loss is more, and efficient is lower.
In addition, this patent has only provided the modulation strategy of unity power factor, can't realize modulation for application scenario those skilled in the art of demand reactive power.
Summary of the invention
The technical problem that the present invention will solve provides a kind of single-phase inverter, and the semiconductor number of use is less, and loss is less, has improved conversion efficiency, has reduced cost; And the modulation strategy that single-phase inverter is applied to unity power factor and/or the modulation strategy of reactive power occasion be provided further.
The present invention provides a kind of single-phase inverter, comprising: first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube;
The anode of DC power supply connects the negative terminal of DC power supply through first switching tube, the 4th switching tube, the 5th switching tube of series connection successively; The anode of DC power supply connects the negative terminal of DC power supply through second switch pipe, the 3rd switching tube, the 6th switching tube of series connection successively;
Second end of the 4th switching tube links to each other with second end of the 3rd switching tube;
Be connected with AC load between second end of first switching tube and second end of second switch pipe;
Said single-phase inverter is applied to the fashionable of unity power factor, the 3rd switching tube reverse parallel connection the 3rd diode, and the 4th switching tube reverse parallel connection the 4th diode.
Preferably, said single-phase inverter also comprises first inductance, second inductance and second electric capacity;
Second end of said first switching tube is connected second end of said second switch pipe through first inductance, second electric capacity and second inductance of series connection successively.
Preferably, said single-phase inverter is applied to the fashionable of unity power factor, and four corresponding operation modes are respectively:
First operation mode: six switching tube conductings first and third,, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-first switching tube-first inductance-electrical network VG-second inductance-the 3rd switching tube-the 6th switching tube to the DC power supply negative busbar;
Second operation mode: the 3rd switching tube conducting, rest switch Guan Jun ends; Electric current is through the 3rd switching tube-the 4th diode-first inductance-electrical network VG-second inductance to the three switching tubes;
The 3rd operation mode: the second, four, five switching tube conductings, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-second switch pipe-second inductance-electrical network VG-first inductance-the 4th switching tube-the 5th switching tube to the DC power supply negative busbar;
The 4th operation mode: the 4th switching tube conducting, rest switch Guan Jun ends; Electric current is through the 4th switching tube-the 3rd diode-second inductance-electrical network VG-first inductance to the four switching tubes.
Preferably, the conducting clock signal of said first, six switching tubes compares generation by sine wave and triangular wave, in said first, the six switching tube conductings during greater than triangular wave of said sine wave, otherwise ends;
The conducting sequential of said second, five switching tubes is compared by the backward-wave and the said triangular wave of said sine wave, second, the five switching tube conductings during of the backward-wave of said sine wave greater than said triangular wave, on the contrary end;
The conducting clock signal of said the 3rd switching tube, the 3rd switching tube conducting when said sinusoidal wave positive half period, the 3rd switching tube ends when said sinusoidal wave negative half-cycle;
The conducting clock signal of said the 4th switching tube, the 4th switching tube conducting when said sinusoidal wave negative half-cycle, the 4th switching tube ends when said sinusoidal wave positive half period.
The present invention also provides a kind of single-phase inverter, comprising: first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube;
The anode of DC power supply connects the negative terminal of DC power supply through first switching tube, the 4th switching tube, the 5th switching tube of series connection successively; The anode of DC power supply connects the negative terminal of DC power supply through second switch pipe, the 3rd switching tube, the 6th switching tube of series connection successively;
Second end of the 4th switching tube links to each other with second end of the 3rd switching tube;
Be connected with AC load between second end of first switching tube and second end of second switch pipe;
Said single-phase inverter is applied to occasion and/or demand reactive power fashionable of unity power factor, and first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube be reverse parallel connection first diode, second diode, the 3rd diode, tetrode, the 5th diode and the 6th diode respectively.
Preferably, said single-phase inverter also comprises first inductance, second inductance and second electric capacity;
Said first output end of switching tube is connected the output of said second switch pipe through first inductance, second electric capacity and second inductance of series connection successively.
Preferably, said single-phase inverter is applied to the fashionable of demand reactive power, and six corresponding operation modes are respectively:
First operation mode: six switching tube conductings first and third,, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-first switching tube-first inductance-electrical network VG-second inductance-the 3rd switching tube-the 6th switching tube to the DC power supply negative busbar;
Second operation mode: third and fourth switching tube conducting, rest switch Guan Jun ends; Electric current is through the 4th switching tube-the 3rd diode-second inductance-electrical network VG-first inductance to the four switching tubes; Or electric current is through the 3rd switching tube-the 4th diode-first inductance-electrical network VG-second inductance to the three switching tubes;
The 3rd operation mode: the second, four, five switching tube conductings, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-second switch pipe-second inductance-electrical network VG-first inductance-the 4th switching tube-the 5th switching tube to the DC power supply negative busbar;
The 4th operation mode: third and fourth switching tube conducting, rest switch Guan Jun ends; Electric current is through the 3rd switching tube-the 4th diode-first inductance-electrical network VG-second inductance to the three switching tubes; Or electric current is through the 4th switching tube-the 3rd diode-second inductance-electrical network VG-first inductance to the four switching tubes;
The 5th operation mode: six switching tube conductings first and third,, rest switch Guan Jun ends; Electric current through DC power supply negative busbar-Di six diodes-the 3rd diode-second inductance-electrical network VG-first inductance-first diode to the DC power supply positive bus-bar;
The 6th operation mode: the second, four, five switching tube conductings, rest switch Guan Jun ends; Electric current through DC power supply negative busbar-Di five diodes-the 4th diode-first inductance-electrical network VG-second inductance-second diode to the DC power supply positive bus-bar.
Preferably, the conducting clock signal of said first, six switching tubes compares generation by sine wave and triangular wave, in said first, the six switching tube conductings during greater than triangular wave of said sine wave, otherwise ends;
The conducting sequential of said second, five switching tubes is compared by the backward-wave and the said triangular wave of said sine wave, second, the five switching tube conductings during of the backward-wave of said sine wave greater than said triangular wave, on the contrary end;
The conducting clock signal of said the 3rd switching tube is compared by the backward-wave and the said triangular wave of said sine wave, the 3rd switching tube conducting during of the backward-wave of said sine wave less than said triangular wave, on the contrary end;
The conducting clock signal of said the 4th switching tube compares generation by sinusoidal wave and triangular wave, in said the 4th switching tube conducting during less than triangular wave of said sine wave, otherwise ends.
Preferably, said single-phase inverter is applied to the fashionable of unity power factor, and four corresponding operation modes are respectively:
First operation mode: six switching tube conductings first and third,, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-first switching tube-first inductance-electrical network VG-second inductance-the 3rd switching tube-the 6th switching tube to the DC power supply negative busbar;
Second operation mode: the 3rd switching tube conducting, rest switch Guan Jun ends; Electric current is through the 3rd switching tube-the 4th diode-first inductance-electrical network VG-second inductance to the three switching tubes;
The 3rd operation mode: the second, four, five switching tube conductings, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-second switch pipe-second inductance-electrical network VG-first inductance-the 4th switching tube-the 5th switching tube to the DC power supply negative busbar;
The 4th operation mode: the 4th switching tube conducting, rest switch Guan Jun ends; Electric current is through the 4th switching tube-the 3rd diode-second inductance-electrical network VG-first inductance to the four switching tubes.
Preferably, the conducting clock signal of said first, six switching tubes compares generation by sine wave and triangular wave, in said first, the six switching tube conductings during greater than triangular wave of said sine wave, otherwise ends;
The conducting sequential of said second, five switching tubes is compared by the backward-wave and the said triangular wave of said sine wave, second, the five switching tube conductings during of the backward-wave of said sine wave greater than said triangular wave, on the contrary end;
The conducting clock signal of said the 3rd switching tube, the 3rd switching tube conducting when said sinusoidal wave positive half period, the 3rd switching tube ends when said sinusoidal wave negative half-cycle;
Perhaps, the conducting clock signal of said the 3rd switching tube is compared by the backward-wave and the said triangular wave of said sine wave, the 3rd switching tube conducting during of the backward-wave of said sine wave less than said triangular wave, on the contrary end;
The conducting clock signal of said the 4th switching tube, the 4th switching tube conducting when said sinusoidal wave negative half-cycle, the 4th switching tube ends when said sinusoidal wave positive half period;
Perhaps, the conducting clock signal of said the 4th switching tube compares generation by sinusoidal wave and triangular wave, in said the 4th switching tube conducting during less than triangular wave of said sine wave, otherwise ends.
Compared with prior art, the present invention has the following advantages:
The said single-phase inverter of the embodiment of the invention comprises six switching tubes; The anode of DC power supply connects the negative terminal of DC power supply through first switching tube, the 4th switching tube, the 5th switching tube of series connection successively; The anode of DC power supply connects the negative terminal of DC power supply through second switch pipe, the 3rd switching tube, the 6th switching tube of series connection successively; And second end of the 4th switching tube links to each other with second end of the 3rd switching tube; Be connected with electrical network between second end of first switching tube and second end of second switch pipe; Changed the circuit structure of existing single-phase inverter.And be applied to the fashionable of unity power factor at the said single-phase inverter of the embodiment of the invention; The 3rd switching tube and the 4th switching tube reverse parallel connection the 3rd diode and the 4th diode respectively replace external diode of the prior art through the 3rd switching tube and the 4th switching tube reverse parallel connection the 3rd diode and the 4th diode; Satisfy the afterflow of first and second inductance equally, practiced thrift manufacturing cost.
Further; Diode of the equal reverse parallel connection of each switching tube of the said single-phase inverter of the embodiment of the invention; The said single-phase inverter of the embodiment of the invention just can satisfy two kinds of modulation strategies under unity power factor occasion and the demand reactive power occasion like this; And when adopting the modulation strategy of demand reactive power,, said single-phase inverter work at present switches to the modulation strategy of unity power factor even, also need not carrying out the modulation strategy of demand reactive power in the unity power factor state.
Description of drawings
Fig. 1 is the single-phase non-isolation type combining inverter topological diagram of available technology adopting H6 topological structure;
Fig. 2 a is the said single-phase inverter topological diagram of first embodiment of the invention;
Fig. 2 b is the said single-phase inverter topological diagram of second embodiment of the invention;
Fig. 3 is that the said single-phase inverter of first embodiment of the invention is in the corresponding topological diagram of first operation mode;
Fig. 4 is that the said single-phase inverter of first embodiment of the invention is in the corresponding topological diagram of second operation mode;
Fig. 5 is that the said single-phase inverter of first embodiment of the invention is in the corresponding topological diagram of the 3rd operation mode;
Fig. 6 is that the said single-phase inverter of first embodiment of the invention is in the corresponding topological diagram of the 4th operation mode;
Fig. 7 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of first operation mode;
Fig. 8 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of second operation mode;
Fig. 9 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of the 3rd operation mode;
Figure 10 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of the 4th operation mode;
Figure 11 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of the 5th operation mode;
Figure 12 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of the 6th operation mode;
Figure 13 is the conducting sequential chart that the said single-phase inverter of first and second embodiment of the present invention is applied to six switching tubes under the unity power factor occasion;
Figure 14 is the conducting sequential chart that the said single-phase inverter of second embodiment of the invention is applied to six switching tubes under the demand reactive power occasion.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
Referring to Fig. 2 a, this figure is the said single-phase inverter topological diagram of first embodiment of the invention.
The said single-phase inverter of first embodiment of the invention comprises: first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6.
The anode of DC power supply (DC power supply positive bus-bar) connects the negative terminal (DC power supply negative busbar) of DC power supply through first capacitor C 1.
First switch transistor T 1 of the anode of DC power supply through series connection successively, the 4th switch transistor T 4, the 5th switch transistor T 5 connect the negative terminal of DC power supplys; The anode of DC power supply connects the negative terminal of DC power supplys through second switch pipe T2, the 3rd switch transistor T 3, the 6th switch transistor T 6 of series connection successively.
Second end of the 4th switch transistor T 4 links to each other with second end of the 3rd switch transistor T 3.
Connect AC load between second end (first end of the 3rd switch transistor T 3) of second end of first switch transistor T 1 (first end of the 4th switch transistor T 4) and second switch pipe T2.Said AC load can be electrical network.
The said single-phase inverter of first embodiment of the invention is applied to the fashionable of unity power factor, the 3rd switch transistor T 3 reverse parallel connections the 3rd diode D3, and the 4th switch transistor T 4 reverse parallel connections the 4th diode D4.The 3rd diode D3, the 4th diode D4 can be respectively the 3rd switch transistor T 3, the built-in diode of the 4th switch transistor T 4.
Said first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6 all can be managed for IGBT; First end of said first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6 is a collector electrode, and second end is an emitter.
Said first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6 can also be semiconductor device such as MOSFET.
The filter circuit of the said single-phase inverter of the embodiment of the invention specifically can adopt the LC mode filter, can also adopt L type or LCL mode filter as filter circuit.
Referring to Fig. 2 a, the said single-phase inversion implement body of first embodiment of the invention can comprise that first inductance L 1, second inductance L 2 and second capacitor C are as filter circuit.
Second end of said first switch transistor T 1 is through first inductance L 1 of series connection successively, second capacitor C is connected said second switch pipe T2 with second inductance L 2 second end (or, first end of the 3rd switch transistor T 3).
Referring to Fig. 3 to Fig. 6, Fig. 3 is that the said single-phase inverter of first embodiment of the invention is in the corresponding topological diagram of first operation mode; Fig. 4 is that the said single-phase inverter of first embodiment of the invention is in the corresponding topological diagram of second operation mode; Fig. 5 is that the said single-phase inverter of first embodiment of the invention is in the corresponding topological diagram of the 3rd operation mode; Fig. 6 is that the said single-phase inverter of first embodiment of the invention is in the corresponding topological diagram of the 4th operation mode.
The said single-phase inverter of first embodiment of the invention can only be applied to the fashionable modulation strategy in field of unity power factor, and four corresponding operation modes are respectively:
First operation mode, current circuit are referring to Fig. 3: first and third, six switch transistor T 1, T3, T6 conducting, and rest switch Guan Jun ends; Path of current is: electric current is through the DC power supply positive bus-bar-first switch transistor T 1-first inductance L 1-electrical network VG-second inductance L 2-the 3rd switch transistor T 3-the 6th switch transistor T 6 to DC power supply negative busbar.
Second operation mode, current circuit are referring to Fig. 4 (first and second inductance L 1, the afterflow of L2 forward): 3 conductings of the 3rd switch transistor T, and rest switch Guan Jun ends; Path of current is: electric current is through the 3rd switch transistor T 3-the 4th diode D4-first inductance L 1-electrical network VG-second inductance L 2 to the 3rd switch transistor T 3.
The 3rd operation mode, current circuit are referring to Fig. 5: the second, four, five switch transistor T 2, T4, T5 conducting, and rest switch Guan Jun ends; Path of current is: electric current is through the DC power supply positive bus-bar-second switch pipe T2-second inductance L 2-electrical network VG-first inductance L 1-the 4th switch transistor T 4-the 5th switch transistor T 5 to DC power supply negative busbar.
The 4th operation mode, current circuit are referring to Fig. 6 (first and second inductance L 1, the afterflow of L2 negative sense): 4 conductings of the 4th switch transistor T, and rest switch Guan Jun ends; Path of current is: electric current is through the 4th switch transistor T 4-the 3rd diode D3-second inductance L 2-electrical network VG-first inductance L 1 to the 4th switch transistor T 4.
Referring to Figure 13, this figure is the conducting sequential chart that the said single-phase inverter of first and second embodiment of the present invention is applied to six switching tubes under the unity power factor occasion.
The said single-phase inverter of first embodiment of the invention be applied under the unity power factor occasion (voltage for correct time electric current for just, voltage when negative electric current for negative) the conducting sequential of six switching tubes of modulation strategy:
The conducting clock signal of said first, six switch transistor T 1, T6 compares generation by sine wave and triangular wave, in said first, six switch transistor T 1, the T6 conducting during greater than triangular wave of said sine wave, otherwise ends.
The conducting sequential of said second, five switch transistor T 2, T5 is compared by the backward-wave and the said triangular wave of said sine wave, and the backward-wave of said sine wave is second, five switch transistor T 2, T5 conducting during greater than said triangular wave, otherwise ends.
The conducting clock signal of said the 3rd switch transistor T 3, the 3rd switch transistor T 3 conductings when said sinusoidal wave positive half period, the 3rd switch transistor T 3 is ended when said sinusoidal wave negative half-cycle.
The conducting clock signal of said the 4th switch transistor T 4, the 4th switch transistor T 4 conductings when said sinusoidal wave negative half-cycle, the 4th switch transistor T 4 is ended when said sinusoidal wave positive half period.
The said single-phase inverter of first embodiment of the invention comprises six switching tubes; First switch transistor T 1 of the anode of DC power supply through series connection successively, the 4th switch transistor T 4, the 5th switch transistor T 5 connect the negative terminal of DC power supplys; The anode of DC power supply connects the negative terminal of DC power supplys through second switch pipe T2, the 3rd switch transistor T 3, the 6th switch transistor T 6 of series connection successively; And second end of the 4th switch transistor T 4 links to each other with second end of the 3rd switch transistor T 3; Be connected with electrical network VG between second end of second end of first switch transistor T 1 and second switch pipe T2; Changed the circuit structure of existing single-phase inverter.And being applied to the fashionable of unity power factor at the said single-phase inverter of first embodiment of the invention, the 3rd switch transistor T 3 is distinguished reverse parallel connection the 3rd diode D3 and the 4th diode D4 with the 4th switch transistor T 4.Replace external diode of the prior art through the 3rd switch transistor T 3 and the 4th switch transistor T 4 reverse parallel connections the 3rd diode D3 and the 4th diode D4, satisfy the afterflow of first and second inductance L 1, L2 equally, practiced thrift manufacturing cost.
Referring to Fig. 2 b, this figure is the said single-phase inverter topological diagram of second embodiment of the invention.
The difference of the said single-phase inverter of second embodiment of the invention and first embodiment is that each switching tube is diode of reverse parallel connection respectively.Particularly, first switch transistor T, 1 reverse parallel connection, the first diode D1; , the second switch pipe T2 reverse parallel connection second diode D2; The 3rd switch transistor T 3 reverse parallel connections the 3rd diode D3; The 4th switch transistor T 4 reverse parallel connections the 4th diode D4; The 5th switch transistor T 5 reverse parallel connections the 5th diode D5; The 6th switch transistor T 6 reverse parallel connections the 6th diode D6.Above-mentioned diode can be respectively the diode-built-in of corresponding switching tube.
Equally; Said first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6 all can be managed for IGBT; First end of said first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6 is a collector electrode, and second end is an emitter.
Said first switch transistor T 1, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6 can also be semiconductor device such as MOSFET.
The said single-phase inverter of second embodiment of the invention also comprises first inductance L 1, second inductance L 2 and second capacitor C.
Second end of said first switch transistor T 1 is through first inductance L 1 of series connection successively, second capacitor C is connected said second switch pipe T2 with second inductance L 2 second end.
The said single-phase inverter of second embodiment of the invention not only can be applied to the occasion of unity power factor, can also be applied to the occasion of demand reactive power.
Referring to Fig. 7 to Figure 12, Fig. 7 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of first operation mode; Fig. 8 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of second operation mode; Fig. 9 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of the 3rd operation mode; Figure 10 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of the 4th operation mode; Figure 11 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of the 5th operation mode; Figure 12 is that the said single-phase inverter of second embodiment of the invention is in the corresponding topological diagram of the 6th operation mode.
When the said single-phase inverter of second embodiment of the invention is applied to the modulation strategy of occasion of unity power factor, current circuit referring to Fig. 7 to shown in Figure 12, four corresponding operation modes:
First operation mode, current circuit are referring to Fig. 7: first and third, six switch transistor T 1, T3, T6 conducting, and rest switch Guan Jun ends; Path of current is: electric current is through the DC power supply positive bus-bar-first switch transistor T 1-first inductance L 1-electrical network VG-second inductance L 2-the 3rd switch transistor T 3-the 6th switch transistor T 6 to DC power supply negative busbar.
Second operation mode, current circuit are referring to Fig. 8: (first and second inductance L 1, the afterflow of L2 forward): 3 conductings of the 3rd switch transistor T, and rest switch Guan Jun ends; Path of current is: electric current is through the 3rd switch transistor T 3-the 4th diode D4-first inductance L 1-electrical network VG-second inductance L 2 to the 3rd switch transistor T 3.
The 3rd operation mode, current circuit are referring to Fig. 9: the second, four, five switch transistor T 2, T4, T5 conducting, and rest switch Guan Jun ends; Path of current is: electric current is through the DC power supply positive bus-bar-second switch pipe T2-second inductance L 2-electrical network VG-first inductance L 1-the 4th switch transistor T 4-the 5th switch transistor T 5 to DC power supply negative busbar.
The 4th operation mode, current circuit are referring to Figure 10: (first and second inductance L 1, the afterflow of L2 negative sense): 4 conductings of the 4th switch transistor T, and rest switch Guan Jun ends; Path of current is: electric current is through the 4th switch transistor T 4-the 3rd diode D3-second inductance L 2-electrical network VG-first inductance L 1 to the 4th switch transistor T 4.
The said single-phase inverter of second embodiment of the invention is applied to the fashionable of demand reactive power, current circuit referring to Fig. 7 to shown in Figure 12.
The said single-phase inverter of second embodiment of the invention is applied to the fashionable modulation strategy in field of demand reactive power, and six corresponding operation modes are respectively:
First operation mode, current circuit are referring to Fig. 7: first and third, six switch transistor T 1, T3, T6 conducting, and rest switch Guan Jun ends; Path of current is: electric current is through the DC power supply positive bus-bar-first switch transistor T 1-first inductance L 1-electrical network VG-second inductance L 2-the 3rd switch transistor T 3-the 6th switch transistor T 6 to DC power supply negative busbar.
Second operation mode, current circuit are referring to Fig. 8: (first and second inductance L 1, L2 forward or negative sense afterflow): the 3rd switch transistor T 3 and 4 conductings of the 4th switch transistor T, and rest switch Guan Jun ends; Path of current is: electric current is through the 3rd switch transistor T 3-the 4th diode D4-first inductance L 1-electrical network VG-second inductance L 2 to the 3rd switch transistor T 3; Perhaps, path of current is: electric current is through the 4th switch transistor T 4-the 3rd diode D3-second inductance L 2-electrical network VG-first inductance L 1 to the 4th switch transistor T 4.
At this moment because under demand reactive power occasion; Virtual voltage u after the modulation is correct time; Actual current i maybe be for just also maybe be for negative, needs therefore to guarantee that above-mentioned two current paths all can conducting, and promptly the 3rd switch transistor T 3 and the 4th switch transistor T 4 keep conducting state simultaneously.
The 3rd operation mode, current circuit are referring to Fig. 9: the second, four, five switch transistor T 2, T4, T5 conducting, and rest switch Guan Jun ends; Path of current is: electric current is through the DC power supply positive bus-bar-second switch pipe T2-second inductance L 2-electrical network VG-first inductance L 1-the 4th switch transistor T 4-the 5th switch transistor T 5 to DC power supply negative busbar.
The 4th operation mode, current circuit are referring to Figure 10: (first and second inductance L 1, L2 negative sense or forward afterflow): the 3rd switch transistor T 3 and 4 conductings of the 4th switch transistor T, and rest switch Guan Jun ends; Path of current is: electric current is through the 4th switch transistor T 4-the 3rd diode D3-second inductance L 2-electrical network VG-first inductance L 1 to the 4th switch transistor T 4; Perhaps, path of current is: electric current is through the 3rd switch transistor T 3-the 4th diode D4-first inductance L 1-electrical network VG-second inductance L 2 to the 3rd switch transistor T 3.
The 5th operation mode, current circuit are referring to Figure 11: first and third, six switch transistor T 1, T3, T6 conducting, and rest switch Guan Jun ends; Path of current is: electric current through DC power supply negative busbar-Di six diode D6-the 3rd diode D3-second inductance L 2-electrical network VG-first inductance L 1-first diode D1 to the DC power supply positive bus-bar.
The 6th operation mode, current circuit are referring to Figure 12: the second, four, five switch transistor T 2, T4, T5 conducting, and rest switch Guan Jun ends; Path of current is: electric current through DC power supply negative busbar-Di five diode D5-the 4th diode D4-first inductance L 1-electrical network VG-second inductance L 2-second diode D2 to the DC power supply positive bus-bar.
Because the existence of above-mentioned six operation modes of demand reactive power occasion, so each switching tube all needs reverse parallel connection that a diode is arranged, so that above-mentioned current channel to be provided.
Referring to Figure 14, this figure is the conducting sequential chart that the said single-phase inverter of second embodiment of the invention is applied to six switching tubes under the demand reactive power occasion.
The said single-phase inverter of second embodiment of the invention be applied to the demand reactive power occasion (voltage for correct time electric current maybe be for just also maybe be for negative, electric current maybe be for just also maybe be for negative when negative for voltage) the conducting sequential of corresponding six switching tubes of modulation strategy:
The conducting clock signal of said first, six switch transistor T 1, T6 compares generation by sinusoidal wave (being the voltage u modulating wave among Figure 10) and triangular wave, in said first, six switch transistor T 1, the T6 conducting during greater than triangular wave of said sine wave, otherwise ends.
The conducting sequential of said second, five switch transistor T 2, T5 is compared by the backward-wave and the said triangular wave of said sine wave, and the backward-wave of said sine wave is second, five switch transistor T 2, T5 conducting during greater than said triangular wave, otherwise ends.
The conducting clock signal of said the 3rd switch transistor T 3 is compared by the backward-wave and the said triangular wave of said sine wave, the 3rd switching tube conducting during of the backward-wave of said sine wave less than said triangular wave, on the contrary end.
The conducting clock signal of said the 4th switch transistor T 4 compares generation by sinusoidal wave and triangular wave, in said the 4th switching tube conducting during less than triangular wave of said sine wave, otherwise ends.
Diode of the equal reverse parallel connection of each switching tube of the said single-phase inverter of second embodiment of the invention, the said single-phase inverter of second embodiment of the invention just can satisfy two kinds of modulation strategies under unity power factor occasion and the demand reactive power occasion like this.And when the modulation strategy of employing demand reactive power,, said single-phase inverter work at present switches to the modulation strategy of unity power factor even, also need not carrying out the modulation strategy of demand reactive power in the unity power factor state.
When adopting the modulation strategy of demand reactive power; Said single-phase inverter work at present is in the unity power factor state; Can use modulation strategy shown in Figure 13 (concrete modulation strategy is said referring to preamble), also can continue modulation strategy with reactive power shown in Figure 14.
Referring to Figure 14, specify as follows:
The conducting clock signal of said first, six switch transistor T 1, T6 compares generation by said sine wave and triangular wave, in said first, six switch transistor T 1, the T6 conducting during greater than triangular wave of said sine wave, otherwise ends;
The conducting sequential of said second, five switch transistor T 2, T5 is compared by the backward-wave and the said triangular wave of said sine wave, and the backward-wave of said sine wave is second, five switch transistor T 2, T5 conducting during greater than said triangular wave, otherwise ends;
The conducting clock signal of said the 3rd switch transistor T 3 is compared by the backward-wave and the said triangular wave of said sine wave, and the backward-wave of said sine wave is 3 conductings of the 3rd switch transistor T during less than said triangular wave, otherwise end;
The conducting clock signal of said the 4th switch transistor T 4 compares generation by sinusoidal wave and triangular wave, in said the 4th switch transistor T 4 conductings during less than triangular wave of said sine wave, otherwise ends.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art; Do not breaking away under the technical scheme scope situation of the present invention; All the method for above-mentioned announcement capable of using and technology contents are made many possible changes and modification to technical scheme of the present invention, or are revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical scheme of the present invention, all still belongs in the scope of technical scheme protection of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. a single-phase inverter is characterized in that, comprising: first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube;
The anode of DC power supply connects the negative terminal of DC power supply through first switching tube, the 4th switching tube, the 5th switching tube of series connection successively; The anode of DC power supply connects the negative terminal of DC power supply through second switch pipe, the 3rd switching tube, the 6th switching tube of series connection successively;
Second end of the 4th switching tube links to each other with second end of the 3rd switching tube;
Be connected with AC load between second end of first switching tube and second end of second switch pipe;
Said single-phase inverter is applied to the fashionable of unity power factor, the 3rd switching tube reverse parallel connection the 3rd diode, and the 4th switching tube reverse parallel connection the 4th diode.
2. single-phase inverter according to claim 1 is characterized in that, said single-phase inverter also comprises first inductance, second inductance and second electric capacity;
Second end of said first switching tube is connected second end of said second switch pipe through first inductance, second electric capacity and second inductance of series connection successively.
3. single-phase inverter according to claim 1 and 2 is characterized in that, said single-phase inverter is applied to the fashionable of unity power factor, and four corresponding operation modes are respectively:
First operation mode: six switching tube conductings first and third,, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-first switching tube-first inductance-electrical network VG-second inductance-the 3rd switching tube-the 6th switching tube to the DC power supply negative busbar;
Second operation mode: the 3rd switching tube conducting, rest switch Guan Jun ends; Electric current is through the 3rd switching tube-the 4th diode-first inductance-electrical network VG-second inductance to the three switching tubes;
The 3rd operation mode: the second, four, five switching tube conductings, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-second switch pipe-second inductance-electrical network VG-first inductance-the 4th switching tube-the 5th switching tube to the DC power supply negative busbar;
The 4th operation mode: the 4th switching tube conducting, rest switch Guan Jun ends; Electric current is through the 4th switching tube-the 3rd diode-second inductance-electrical network VG-first inductance to the four switching tubes.
4. single-phase inverter according to claim 3; It is characterized in that; The conducting clock signal of said first, six switching tubes compares generation by sine wave and triangular wave, in said first, the six switching tube conductings during greater than triangular wave of said sine wave, otherwise ends;
The conducting sequential of said second, five switching tubes is compared by the backward-wave and the said triangular wave of said sine wave, second, the five switching tube conductings during of the backward-wave of said sine wave greater than said triangular wave, on the contrary end;
The conducting clock signal of said the 3rd switching tube, the 3rd switching tube conducting when said sinusoidal wave positive half period, the 3rd switching tube ends when said sinusoidal wave negative half-cycle;
The conducting clock signal of said the 4th switching tube, the 4th switching tube conducting when said sinusoidal wave negative half-cycle, the 4th switching tube ends when said sinusoidal wave positive half period.
5. a single-phase inverter is characterized in that, comprising: first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube;
The anode of DC power supply connects the negative terminal of DC power supply through first switching tube, the 4th switching tube, the 5th switching tube of series connection successively; The anode of DC power supply connects the negative terminal of DC power supply through second switch pipe, the 3rd switching tube, the 6th switching tube of series connection successively;
Second end of the 4th switching tube links to each other with second end of the 3rd switching tube;
Be connected with AC load between second end of first switching tube and second end of second switch pipe;
Said single-phase inverter is applied to occasion and/or demand reactive power fashionable of unity power factor, and first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube be reverse parallel connection first diode, second diode, the 3rd diode, tetrode, the 5th diode and the 6th diode respectively.
6. single-phase inverter according to claim 5 is characterized in that, said single-phase inverter also comprises first inductance, second inductance and second electric capacity;
Said first output end of switching tube is connected the output of said second switch pipe through first inductance, second electric capacity and second inductance of series connection successively.
7. according to claim 5 or 6 described single-phase inverters, it is characterized in that said single-phase inverter is applied to the fashionable of demand reactive power, six corresponding operation modes are respectively:
First operation mode: six switching tube conductings first and third,, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-first switching tube-first inductance-electrical network VG-second inductance-the 3rd switching tube-the 6th switching tube to the DC power supply negative busbar;
Second operation mode: third and fourth switching tube conducting, rest switch Guan Jun ends; Electric current is through the 4th switching tube-the 3rd diode-second inductance-electrical network VG-first inductance to the four switching tubes; Or electric current is through the 3rd switching tube-the 4th diode-first inductance-electrical network VG-second inductance to the three switching tubes;
The 3rd operation mode: the second, four, five switching tube conductings, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-second switch pipe-second inductance-electrical network VG-first inductance-the 4th switching tube-the 5th switching tube to the DC power supply negative busbar;
The 4th operation mode: third and fourth switching tube conducting, rest switch Guan Jun ends; Electric current is through the 3rd switching tube-the 4th diode-first inductance-electrical network VG-second inductance to the three switching tubes; Or electric current is through the 4th switching tube-the 3rd diode-second inductance-electrical network VG-first inductance to the four switching tubes;
The 5th operation mode: six switching tube conductings first and third,, rest switch Guan Jun ends; Electric current through DC power supply negative busbar-Di six diodes-the 3rd diode-second inductance-electrical network VG-first inductance-first diode to the DC power supply positive bus-bar;
The 6th operation mode: the second, four, five switching tube conductings, rest switch Guan Jun ends; Electric current through DC power supply negative busbar-Di five diodes-the 4th diode-first inductance-electrical network VG-second inductance-second diode to the DC power supply positive bus-bar.
8. single-phase inverter according to claim 7; It is characterized in that; The conducting clock signal of said first, six switching tubes compares generation by sine wave and triangular wave, in said first, the six switching tube conductings during greater than triangular wave of said sine wave, otherwise ends;
The conducting sequential of said second, five switching tubes is compared by the backward-wave and the said triangular wave of said sine wave, second, the five switching tube conductings during of the backward-wave of said sine wave greater than said triangular wave, on the contrary end;
The conducting clock signal of said the 3rd switching tube is compared by the backward-wave and the said triangular wave of said sine wave, the 3rd switching tube conducting during of the backward-wave of said sine wave less than said triangular wave, on the contrary end;
The conducting clock signal of said the 4th switching tube compares generation by sinusoidal wave and triangular wave, in said the 4th switching tube conducting during less than triangular wave of said sine wave, otherwise ends.
9. according to claim 5 or 6 described single-phase inverters, it is characterized in that said single-phase inverter is applied to the fashionable of unity power factor, four corresponding operation modes are respectively:
First operation mode: six switching tube conductings first and third,, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-first switching tube-first inductance-electrical network VG-second inductance-the 3rd switching tube-the 6th switching tube to the DC power supply negative busbar;
Second operation mode: the 3rd switching tube conducting, rest switch Guan Jun ends; Electric current is through the 3rd switching tube-the 4th diode-first inductance-electrical network VG-second inductance to the three switching tubes;
The 3rd operation mode: the second, four, five switching tube conductings, rest switch Guan Jun ends; Electric current through DC power supply positive bus-bar-second switch pipe-second inductance-electrical network VG-first inductance-the 4th switching tube-the 5th switching tube to the DC power supply negative busbar;
The 4th operation mode: the 4th switching tube conducting, rest switch Guan Jun ends; Electric current is through the 4th switching tube-the 3rd diode-second inductance-electrical network VG-first inductance to the four switching tubes.
10. single-phase inverter according to claim 9 is characterized in that,
The conducting clock signal of said first, six switching tubes compares generation by sine wave and triangular wave, in said first, the six switching tube conductings during greater than triangular wave of said sine wave, otherwise ends;
The conducting sequential of said second, five switching tubes is compared by the backward-wave and the said triangular wave of said sine wave, second, the five switching tube conductings during of the backward-wave of said sine wave greater than said triangular wave, on the contrary end;
The conducting clock signal of said the 3rd switching tube, the 3rd switching tube conducting when said sinusoidal wave positive half period, the 3rd switching tube ends when said sinusoidal wave negative half-cycle;
Perhaps, the conducting clock signal of said the 3rd switching tube is compared by the backward-wave and the said triangular wave of said sine wave, the 3rd switching tube conducting during of the backward-wave of said sine wave less than said triangular wave, on the contrary end;
The conducting clock signal of said the 4th switching tube, the 4th switching tube conducting when said sinusoidal wave negative half-cycle, the 4th switching tube ends when said sinusoidal wave positive half period;
Perhaps, the conducting clock signal of said the 4th switching tube compares generation by sinusoidal wave and triangular wave, in said the 4th switching tube conducting during less than triangular wave of said sine wave, otherwise ends.
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| CN105450001A (en) * | 2015-12-31 | 2016-03-30 | 深圳市英威腾电气股份有限公司 | Single-phase inverter, DCAC converter and control method of DCAC converter |
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| CN102005958A (en) * | 2010-11-25 | 2011-04-06 | 河北工业大学 | Photovoltaic grid-connected three-level inverter |
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| EP2290797A2 (en) * | 2004-06-25 | 2011-03-02 | SMA Solar Technology AG | Method of converting a DC voltage of a DC source, in particular of a photovoltaic DC source, in an AC voltage |
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| CN105450001A (en) * | 2015-12-31 | 2016-03-30 | 深圳市英威腾电气股份有限公司 | Single-phase inverter, DCAC converter and control method of DCAC converter |
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