CN104333250A - Low-voltage stress diode clamped multilevel inverter using a novel three-terminal switching network - Google Patents

Abstract

The invention discloses a low-voltage stress diode clamped multilevel inverter using a three-terminal switching network. The low-voltage stress diode voltage-clamped multilevel single-phase half-bridge inverter comprises six power switch tubes and body diodes thereof, two input filter capacitors, a reversely-coupled two-winding transformer, an output filter inductor, an output filter capacitor, and six power diodes. The low-voltage stress diode clamped multilevel inverter can be extended into single-phase full-bridge inverter and three-phase bridge inverter circuits of two structures. Compared with a general two-level or traditional flying capacitor voltage-clamped multilevel inverter topology, no dead zone needs to be set between the power switch tubes of upper and lower bridge arms, the power switch tubes can be switched on to work simultaneously, and multi-level output is realized at an inverter neutral point. Therefore, the output voltage harmonic is improved, the size and volume of the output filter inductor are reduced, and the loss of switching devices is reduced. The system material cost is reduced, and the system performance of the inverter is improved.

Description

With the low voltage stress diode-clamped multi-electrical level inverter of three-terminal switch network

Technical field

The present invention relates to a kind of multi-electrical level inverter, be specifically related to, with the low voltage stress diode-clamped multi-electrical level inverter of three-terminal switch network, namely use low voltage stress diode voltage Clamp many level single-phase inverter and the three-phase inverter of novel three-terminal switch network.

Background technology

Direct current can be converted to alternating current by inverter.Inverter is uninterrupted power supply (UPS), and wind energy, photovoltaic, with the important component part in the grid-connected power generation system such as fuel cell.Conversion efficiency, output harmonic wave are the most important electrical specifications of inverter, and the loss of high conversion efficiency cpable of lowering power, low harmony wave can improve the quality of power supply.

Power device in inverter and the loss of output inductor limit the raising of inverter efficiency.Simultaneously the rise of the prices of raw and semifnished materials such as fierce, the power switch pipe of the Japanese TV play of market competition and iron and steel copper, brings very large cost pressure to inverter producer.At present due to the restriction by power device performance, the power device of conventional voltage Clamp multi-electrical level inverter topology and the loss of filter inductance have been difficult to reduce, and the multi-electrical level inverter of development high-performance and low-cost becomes the target of each inverter producer.

The device for power switching rated insulation voltage of conventional voltage Clamp multi-electrical level inverter is higher, there is larger on-state loss and switching loss, causes the total losses of device for power switching large, thus reduces the efficiency of whole system.Simultaneously the volume of output inductor, size and weight room for improvement are limited, have impact on efficiency and the cost of inverter further.

In order to low Breakdown Voltage Power switching tube can be used, to reduce power loss, and reduce output inductor volume, to improve the quality of power supply, multi-electrical level inverter topology obtains increasing practical application in recent years.Wherein, the many level topologys of neutral point clamp type (Neutral point clamped, NPC) due to simple for structure, thus are employed in a large number in UPS and photovoltaic DC-to-AC converter.But inductor loss and output harmonic wave are still larger.

Therefore, expect to provide a kind of on-state loss and the switching loss that can reduce device for power switching, and reducing the novel multi-electrical level inverter of output inductor loss and cost, this inverter needs the restriction improving conventional voltage Clamp many level topology with not enough.

Summary of the invention

Below provide about general introduction of the present invention, to provide about the basic comprehension in some of the present invention.Should be appreciated that following content is not describe about exhaustive of the present invention.

A main purpose of the present invention is, provides the low voltage stress diode voltage Clamp many level single-phase inverter and three-phase inverter that use novel three-terminal switch network, comprises following scheme.

Use low voltage stress diode voltage Clamp many level single phase half bridge inverter of novel three-terminal switch network, it comprises: two input powers, two input filter capacitors, six power switch pipes and body diode thereof, the two-winding transformer of a coupled in reverse wi, an output inductor and an output filter capacitor, six power diodes; Wherein the collector electrode of the first power switch pipe is connected with the positive pole of the first input power with the negative electrode of the 4th power diode and the positive pole of the first input filter capacitor, the emitter of the 4th power switch pipe is connected with the negative pole of the second input power with the negative pole of the anode of the first power diode and the second input filter capacitor, the negative pole of the first input filter capacitor is connected with the positive pole of the second input power with the positive pole of the second input filter capacitor with the negative pole of the first input power, forms mid point earth potential; The emitter of the first power switch pipe is connected with the negative electrode of the collector electrode of the second power switch pipe with the 5th power diode, the emitter of the 3rd power switch pipe is connected with the anode of the 6th power diode with the collector electrode of the 4th power switch pipe, and the anode of the 5th power diode is connected with midpoint potential with the negative electrode of the 6th power diode; The negative electrode of the first power diode is connected with the emitter of the anode of the second power diode with the 5th power switch pipe, the negative electrode of the 3rd power diode is connected with the collector electrode of the 6th power switch pipe with the anode of the 4th power diode, and the collector electrode of the 5th power switch pipe is connected with midpoint potential with the emitter of the 6th power switch pipe; The emitter of the second power switch pipe is connected with the Same Name of Ends of the negative electrode of the second power diode with coupled in reverse wi transformer first winding, and the collector electrode of the 3rd power switch pipe is connected with the different name end of coupled in reverse wi transformer second winding with the anode of the 3rd power diode; One end of output inductor is connected with the different name end of coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, the other end is connected with one end of output filter capacitor and output loading, and the other end of output filter capacitor and output loading is connected with mid point earth potential; Six power switch pipes are driven by six drive singal, wherein the first drive singal is modulated by the first modulating wave and first carrier and is formed, second drive singal is formed by the second modulating wave and the second carrier modulation, 3rd drive singal is formed by the 3rd modulating wave and the 3rd carrier modulation, four-wheel drive signal is formed by the 4th modulating wave and the 4th carrier modulation, and the 5th drive singal and the 6th drive singal are without the need to modulating; First modulating wave is identical with the phase place of the 3rd modulating wave, the phase place of first carrier and the phase 180 degree of the 3rd carrier wave, and the second modulating wave and the 4th modulating wave are power frequency sine wave, the phase place of the second carrier wave and the phase 180 degree of the 4th carrier wave;

Replace as equivalent or simple/increase: output inductor can also be integrated in the two-winding transformer of coupled in reverse wi, the leakage inductance of the two-winding transformer of coupled in reverse wi can be used as output inductor in other words; Also comprise without the need to output inductor, with (or) output filter capacitor, form filter circuit by inductive load itself, such as in industrial frequency transformer; Only can also use an input power; Also comprise simultaneously and be connected to second level filter inductance, be connected to the described output by output inductor and output filter capacitor, to form LCL filter circuit.

Use low voltage stress diode voltage Clamp many level single-phase full-bridge inverter of novel three-terminal switch network, it comprises the brachium pontis of the low voltage stress diode voltage Clamp many level single phase half bridge inverter described in two 1, specifically comprise: two input powers, two input filter capacitors, 12 power switch pipes and body diode thereof, the two-winding transformer of two coupled in reverse wi, two output inductors and an output filter capacitor, 12 power diodes, the collector electrode of the first power switch pipe is connected with the positive pole of the first input power with the positive pole of the first input filter capacitor with the negative electrode of the tenth power diode with the collector electrode of the negative electrode of the 4th power diode and the 7th power switch pipe, the emitter of the 4th power switch pipe is connected with the negative pole of the second input power with the negative pole of the second input filter capacitor with the anode of the 7th power diode with the emitter of the anode of the first power diode and the tenth power switch pipe, the negative pole of the first input filter capacitor is connected with the positive pole of the second input power with the positive pole of the second input filter capacitor with the negative pole of the first input power, form mid point earth potential, the emitter of the first power switch pipe is connected with the negative electrode of the collector electrode of the second power switch pipe with the 5th power diode, the emitter of the 3rd power switch pipe is connected with the anode of the 6th power diode with the collector electrode of the 4th power switch pipe, and the anode of the 5th power diode is connected with midpoint potential with the negative electrode of the 6th power diode, the negative electrode of the first power diode is connected with the emitter of the anode of the second power diode with the 5th power switch pipe, the negative electrode of the 3rd power diode is connected with the collector electrode of the 6th power switch pipe with the anode of the 4th power diode, and the collector electrode of the 5th power switch pipe is connected with midpoint potential with the emitter of the 6th power switch pipe, the emitter of the second power switch pipe is connected with the Same Name of Ends of the negative electrode of the second power diode with the first coupled in reverse wi transformer first winding, and the collector electrode of the 3rd power switch pipe is connected with the different name end of the anode of the 3rd power diode with the first coupled in reverse wi transformer second winding, the emitter of the 7th power switch pipe is connected with the negative electrode of the 11 power diode with the collector electrode of the 8th power switch pipe, the emitter of the 9th power switch pipe is connected with the anode of the 12 power diode with the collector electrode of the tenth power switch pipe, and the anode of the 11 power diode is connected with midpoint potential with the negative electrode of the 12 power diode, the negative electrode of the 7th power diode is connected with the emitter of the 11 power switch pipe with the anode of the 8th power diode, the negative electrode of the 9th power diode is connected with the collector electrode of the 12 power switch pipe with the anode of the tenth power diode, and the collector electrode of the 11 power switch pipe is connected with midpoint potential with the emitter of the 12 power switch pipe, the emitter of the 8th power switch pipe is connected with the Same Name of Ends of the negative electrode of the 8th power diode with the second coupled in reverse wi transformer first winding, and the collector electrode of the 9th power switch pipe is connected with the different name end of the anode of the 9th power diode with the second coupled in reverse wi transformer second winding, one end of first output inductor is connected with the different name end of the first coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, and the other end is connected with one end of output filter capacitor and output loading, one end of second output inductor is connected with the different name end of the second coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, and the other end is connected with the other end of output filter capacitor and output loading, 12 power switch pipes are driven by 12 drive singal, wherein the first drive singal is modulated by the first modulating wave and first carrier and is formed, second drive singal is formed by the second modulating wave and the second carrier modulation, 3rd drive singal is formed by the 3rd modulating wave and the 3rd carrier modulation, four-wheel drive signal is formed by the 4th modulating wave and the 4th carrier modulation, 5th drive singal and the 6th drive singal are without the need to modulating, 7th drive singal is formed by the 7th modulating wave and the 7th carrier modulation, 8th drive singal is formed by the 8th modulating wave and the 8th carrier modulation, 9th drive singal is formed by the 9th modulating wave and the 9th carrier modulation, tenth drive singal is formed by the tenth modulating wave and the tenth carrier modulation, 11 drive singal and the tenth two driving signal are without the need to modulating, described first modulating wave is identical with the phase place of the 3rd modulating wave, the phase place of first carrier and the phase 180 degree of the 3rd carrier wave, and the second modulating wave and the 4th modulating wave are power frequency sine wave, the phase place of the second carrier wave and the phase 180 degree of the 4th carrier wave, 7th modulating wave is identical with the phase place of the 9th modulating wave, the phase place of the 7th carrier wave and the phase 180 degree of the 9th carrier wave, and the 8th modulating wave and the 12 modulating wave are power frequency sine wave, the phase place of the 8th carrier wave and the phase 180 degree of the tenth nd carrier, first modulating wave is identical with the phase place of the 7th modulating wave, the phase place of first carrier and the phase 180 degree of the 7th carrier wave, and the second modulating wave is identical with the phase place of carrier wave with the 8th modulating wave,

Replace as equivalent or simple/increase: described output inductor can also be integrated in the two-winding transformer of coupled in reverse wi, the leakage inductance of the two-winding transformer of coupled in reverse wi can be used as output inductor in other words; Also comprise use output inductor, without the need to output inductor, with (or) output filter capacitor, form filter circuit by inductive load itself, such as in industrial frequency transformer; Only can also use an input power; Also comprise simultaneously and be connected to second level filter inductance, be connected to the described output by output inductor and output filter capacitor, to form LCL filter circuit.

Use another kind of low voltage stress diode voltage Clamp many level single-phase full-bridge inverter of novel three-terminal switch network, it comprises brachium pontis and a conventional diode Clamp tri-level inversion brachium pontis of described low voltage stress diode voltage Clamp many level single phase half bridge inverter, specifically comprise: two input powers, two input filter capacitors, ten power switch pipes and body diode thereof, the two-winding transformer of a coupled in reverse wi, an output inductor and an output filter capacitor, eight power diodes, the collector electrode of the first power switch pipe is connected with the positive pole of the first input power with the positive pole of the first input filter capacitor with the negative electrode of the 4th power diode and the collector electrode of the 7th power switch pipe, the emitter of the 4th power switch pipe is connected with the negative pole of the second input power with the negative pole of the second input filter capacitor with the anode of the first power diode and the emitter of the tenth power switch pipe, the negative pole of the first input filter capacitor is connected with the positive pole of the second input power with the positive pole of the second input filter capacitor with the negative pole of the first input power, forms mid point earth potential, the emitter of the first power switch pipe is connected with the negative electrode of the collector electrode of the second power switch pipe with the 5th power diode, the emitter of the 3rd power switch pipe is connected with the anode of the 6th power diode with the collector electrode of the 4th power switch pipe, and the anode of the 5th power diode is connected with midpoint potential with the negative electrode of the 6th power diode, the negative electrode of the first power diode is connected with the emitter of the anode of the second power diode with the 5th power switch pipe, the negative electrode of the 3rd power diode is connected with the collector electrode of the 6th power switch pipe with the anode of the 4th power diode, and the collector electrode of the 5th power switch pipe is connected with midpoint potential with the emitter of the 6th power switch pipe, the emitter of the second power switch pipe is connected with the Same Name of Ends of the negative electrode of the second power diode with coupled in reverse wi transformer first winding, and the collector electrode of the 3rd power switch pipe is connected with the different name end of coupled in reverse wi transformer second winding with the anode of the 3rd power diode, the emitter of the 7th power switch pipe is connected with the negative electrode of the 7th power diode with the collector electrode of the 8th power switch pipe, the emitter of the 9th power switch pipe is connected with the anode of the 8th power diode with the collector electrode of the tenth power switch pipe, and the anode of the 7th power diode is connected with midpoint potential with the negative electrode of the 8th power diode, the emitter of the 8th power switch pipe is connected with one end of output filter capacitor and output loading with the collector electrode of the 8th power switch pipe, one end of output inductor is connected with the different name end of coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, and the other end is connected with the other end of output filter capacitor and output loading, ten power switch pipes are driven by ten drive singal, wherein the first drive singal is modulated by the first modulating wave and first carrier and is formed, second drive singal is formed by the second modulating wave and the second carrier modulation, 3rd drive singal is formed by the 3rd modulating wave and the 3rd carrier modulation, four-wheel drive signal is formed by the 4th modulating wave and the 4th carrier modulation, 5th drive singal and the 6th drive singal are without the need to modulating, 7th drive singal is formed by the 7th modulating wave and the 7th carrier modulation, 8th drive singal is formed by the 8th modulating wave and the 8th carrier modulation, 9th drive singal is formed by the 9th modulating wave and the 9th carrier modulation, tenth drive singal is formed by the tenth modulating wave and the tenth carrier modulation, described first modulating wave is identical with the phase place of the 3rd modulating wave, the phase place of first carrier and the phase 180 degree of the 3rd carrier wave, and the second modulating wave and the 4th modulating wave are power frequency sine wave, the phase place of the second carrier wave and the phase 180 degree of the 4th carrier wave, 7th modulating wave is identical with the phase place of the 9th modulating wave, the phase place of the 7th carrier wave and the phase 180 degree of the 9th carrier wave, and the 8th modulating wave and the tenth modulating wave are power frequency sine wave, the phase place of the 8th carrier wave and the phase 180 degree of the tenth carrier wave, first modulating wave is identical with the phase place of the 7th modulating wave, the phase place of first carrier and the phase 180 degree of the 7th carrier wave, and the second modulating wave is identical with the phase place of carrier wave with the 8th modulating wave,

Replace as equivalent or simple/increase: output inductor can also be integrated in the two-winding transformer of coupled in reverse wi, the leakage inductance of the two-winding transformer of coupled in reverse wi can be used as output inductor in other words; Also comprise use output inductor, without the need to output inductor, with (or) output filter capacitor, form filter circuit by inductive load itself, such as in industrial frequency transformer; Only can also use an input power; Also comprise simultaneously and be connected to second level filter inductance, be connected to the described output by output inductor and output filter capacitor, to form LCL filter circuit.

Use low voltage stress diode voltage Clamp many level three-phase inverter of novel three-terminal switch network, comprise the brachium pontis of the low voltage stress diode voltage Clamp many level single phase half bridge inverter described in three, specifically comprise: two input powers, two input filter capacitors, 18 power switch pipes and body diode thereof, the two-winding transformer of three coupled in reverse wi, three output inductors and three output filter capacitors, 18 power diodes, the collector electrode of the first power switch pipe is connected with the positive pole of the first input power with the positive pole of the first input filter capacitor with the negative electrode of the 6th power diode with the negative electrode of the tenth power diode and the collector electrode of the 11 power switch pipe with the collector electrode of the negative electrode of the 4th power diode and the 7th power switch pipe, the emitter of the 4th power switch pipe is connected with the negative pole of the second input power with the negative pole of the second input filter capacitor with the anode of the 13 power diode with the anode of the 7th power diode and the emitter of the 16 power switch pipe with the emitter of the anode of the first power diode and the tenth power switch pipe, the negative pole of the first input filter capacitor is connected with the positive pole of the second input power with the positive pole of the second input filter capacitor with the negative pole of the first input power, form mid point earth potential, the emitter of the first power switch pipe is connected with the negative electrode of the collector electrode of the second power switch pipe with the 5th power diode, the emitter of the 3rd power switch pipe is connected with the anode of the 6th power diode with the collector electrode of the 4th power switch pipe, and the anode of the 5th power diode is connected with midpoint potential with the negative electrode of the 6th power diode, the negative electrode of the first power diode is connected with the emitter of the anode of the second power diode with the 5th power switch pipe, the negative electrode of the 3rd power diode is connected with the collector electrode of the 6th power switch pipe with the anode of the 4th power diode, and the collector electrode of the 5th power switch pipe is connected with midpoint potential with the emitter of the 6th power switch pipe, the emitter of the second power switch pipe is connected with the Same Name of Ends of the negative electrode of the second power diode with the first coupled in reverse wi transformer first winding, and the collector electrode of the 3rd power switch pipe is connected with the different name end of the anode of the 3rd power diode with the first coupled in reverse wi transformer second winding, the emitter of the 7th power switch pipe is connected with the negative electrode of the 11 power diode with the collector electrode of the 8th power switch pipe, the emitter of the 9th power switch pipe is connected with the anode of the 12 power diode with the collector electrode of the tenth power switch pipe, and the anode of the 11 power diode is connected with midpoint potential with the negative electrode of the 12 power diode, the negative electrode of the 7th power diode is connected with the emitter of the 11 power switch pipe with the anode of the 8th power diode, the negative electrode of the 9th power diode is connected with the collector electrode of the 12 power switch pipe with the anode of the tenth power diode, and the collector electrode of the 11 power switch pipe is connected with midpoint potential with the emitter of the 12 power switch pipe, the emitter of the 8th power switch pipe is connected with the Same Name of Ends of the negative electrode of the 8th power diode with the second coupled in reverse wi transformer first winding, and the collector electrode of the 9th power switch pipe is connected with the different name end of the anode of the 9th power diode with the second coupled in reverse wi transformer second winding, the emitter of the 13 power switch pipe is connected with the negative electrode of the 17 power diode with the collector electrode of the 14 power switch pipe, the emitter of the 15 power switch pipe is connected with the anode of the 18 power diode with the collector electrode of the 16 power switch pipe, and the anode of the 17 power diode is connected with midpoint potential with the negative electrode of the 18 power diode, the negative electrode of the 13 power diode is connected with the emitter of the 17 power switch pipe with the anode of the 14 power diode, the negative electrode of the 15 power diode is connected with the collector electrode of the 18 power switch pipe with the anode of the 16 power diode, and the collector electrode of the 17 power switch pipe is connected with midpoint potential with the emitter of the 18 power switch pipe, the emitter of the 14 power switch pipe is connected with the Same Name of Ends of the negative electrode of the 14 power diode with the 3rd coupled in reverse wi transformer first winding, and the collector electrode of the 15 power switch pipe is connected with the different name end of the anode of the 15 power diode with the 3rd coupled in reverse wi transformer second winding, one end of first output inductor is connected with the different name end of the first coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, one end of second output inductor is connected with the different name end of the second coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, and one end of the 3rd output inductor is connected with the different name end of the 3rd coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, the other end of the first output inductor realizes A phase through the first output filter capacitor and exports, the other end of the second output inductor realizes B phase through the second output filter capacitor and exports, and the other end of the 3rd output inductor realizes C phase through the 3rd output filter capacitor and exports, 18 power switch pipes are driven by 18 drive singal, wherein the first drive singal is modulated by the first modulating wave and first carrier and is formed, second drive singal is formed by the second modulating wave and the second carrier modulation, 3rd drive singal is formed by the 3rd modulating wave and the 3rd carrier modulation, four-wheel drive signal is formed by the 4th modulating wave and the 4th carrier modulation, 5th drive singal is formed by the 5th modulating wave and the 5th carrier modulation, 6th drive singal is formed by the 6th modulating wave and the 6th carrier modulation, 7th drive singal is formed by the 7th modulating wave and the 7th carrier modulation, 8th drive singal is formed by the 8th modulating wave and the 8th carrier modulation, 9th drive singal is formed by the 9th modulating wave and the 9th carrier modulation, tenth drive singal is formed by the tenth modulating wave and the tenth carrier modulation, 11 drive singal is formed by the 11 modulating wave and the 11 carrier modulation, tenth two driving signal is modulated by the 12 modulating wave and the tenth nd carrier and is formed, 13 drive singal and the tenth four-wheel drive signal are without the need to modulating, 15 drive singal and the 16 drive singal are without the need to modulating, 17 drive singal and the 18 drive singal are without the need to modulating, described first modulating wave is identical with the phase place of the 3rd modulating wave, the phase place of first carrier and the phase 180 degree of the 3rd carrier wave, and the second modulating wave and the 4th modulating wave are power frequency sine wave, the phase place of the second carrier wave and the phase 180 degree of the 4th carrier wave, 5th modulating wave is identical with the phase place of the 7th modulating wave, the phase place of the 5th carrier wave and the phase 180 degree of the 7th carrier wave, and the 6th modulating wave and the 8th modulating wave are power frequency sine wave, the phase place of the 6th carrier wave and the phase 180 degree of the 8th carrier wave, 9th modulating wave is identical with the phase place of the 11 modulating wave, the phase place of the 9th carrier wave and the phase 180 degree of the 11 carrier wave, and the tenth modulating wave and the 12 modulating wave are power frequency sine wave, the phase place of the tenth carrier wave and the phase 180 degree of the tenth nd carrier, first modulating wave is identical with the phase place that the 5th modulation involves the 9th modulating wave, the phase place of first carrier and the phase place of the 5th carrier wave and the 9th carrier wave differ 180 degree separately, second is identical with the phase place of carrier wave with the 6th and the tenth modulating wave, the phase 120 degree of the phase place of described first carrier, the phase place of described 5th carrier wave and described 9th carrier wave,

Replace as equivalent or simple/increase: output inductor can also be integrated in the two-winding transformer of coupled in reverse wi, the leakage inductance of the two-winding transformer of coupled in reverse wi can be used as output inductor in other words; Also comprise without the need to output inductor, with (or) output filter capacitor, form filter circuit by inductive load itself, such as in industrial frequency transformer; Only can also use an input power; Also comprise simultaneously and be connected to second level filter inductance, be connected to the described output by output inductor and output filter capacitor, to form LCL filter circuit.Can adapt to have neutral line N and the inverter system without neutral line N; Also comprise the diode voltage Clamp N electrical level inverter using novel three-terminal switch network, above-mentioned diode voltage Clamp three level basic topology can to the expansion of diode voltage Clamp N level topology, and forming diode voltage Clamp N level topology can be the many level topologys of various modified model or universal diode voltage Clamp.

Should emphasize, term " comprises/comprises " existence referring to feature, key element, step or assembly when inventing and using in description, but does not get rid of the existence or additional of one or more further feature, key element, step or assembly.

Compared with prior art, the advantage of the invention and effect comprise:

Circuit structure of the present invention and control simply, can reduce on-state loss and the switching loss of device for power switching, and reduce output inductor loss and cost, and this inverter needs the restriction improving conventional voltage Clamp many level topology with not enough.The present invention adopts coupling inductance PWM phase-shifting carrier wave technology, the not only output level number of easily extensible conventional diode Clamp multi-electrical level inverter, reduce the loss of power device, and significantly reduce output inductor volume, loss and cost, improve the efficiency of inverter, improve inverter output voltage harmonic wave and the quality of power supply, reduce the complete machine cost of inverter, therefore there are great using value and wide market prospects, can be widely used in DC-AC power inversion device (DC/AC), such as uninterrupted power supply (UPS), photovoltaic DC-to-AC converter, wind energy converter, industrial frequency transformer, and fuel cell power source electricity generation system etc.

Accompanying drawing explanation

Below with reference to the accompanying drawings illustrate embodiments of the invention, above and other objects, features and advantages of the present invention can be understood more easily.Parts in accompanying drawing are just in order to illustrate operation principle of the present invention.In the accompanying drawings, same or similar technical characteristic or parts will adopt same or similar Reference numeral to represent.

Figure 1A is the topological circuit figure of the low voltage stress diode voltage Clamp many level single phase half bridge inverter using novel three-terminal switch network according to an embodiment of the invention;

Figure 1B be low voltage stress diode voltage Clamp many level single phase half bridge inverter sinusoidal wave positive half cycle when duty ratio (D) <0.5 for the novel three-terminal switch network of use of Figure 1A drive singal, export the oscillogram of mid-point voltage and transformer excitation electric current;

Fig. 1 C be low voltage stress diode voltage Clamp many level single phase half bridge inverter sinusoidal wave positive half cycle when duty ratio (D) >0.5 for the novel three-terminal switch network of use of Figure 1A drive singal, export the oscillogram of mid-point voltage and transformer excitation electric current;

Fig. 2 is the topological circuit figure of the low voltage stress diode voltage Clamp many level single-phase full-bridge inverter using novel three-terminal switch network according to an embodiment of the invention;

Fig. 3 is the topological circuit figure of the another kind of low voltage stress diode voltage Clamp many level single-phase full-bridge inverter using novel three-terminal switch network according to an embodiment of the invention;

Fig. 4 be use according to an embodiment of the invention the output of novel three-terminal switch network without the neutral line (N) the topological circuit figure of low voltage stress diode voltage Clamp many level three-phase inverter.

Parts in above-mentioned accompanying drawing are just in order to illustrate operation principle of the present invention.In the drawings and in which, according to the usual expression way of this area, same or similar technical characteristic or parts will adopt same or similar Reference numeral to represent.

Embodiment

Below in conjunction with accompanying drawing and example, enforcement of the present invention is described further, but it to be not intention determine key of the present invention or pith, nor is it intended to limit the scope of the present invention.Below with reference to the accompanying drawings illustrate embodiments of the invention, can understand above and other objects, features and advantages of the present invention more easily, not describe part in detail especially if having, be all that those skilled in the art can refer to existing techniques in realizing.

See Figure 1A, a kind of low voltage stress diode voltage Clamp many level single phase half bridge inverter using novel three-terminal switch network, comprise: two input powers (V1, V2), two input filter capacitors (C1, C2), six power switch pipes (S1, S2, S3, S4, S5, S6) and body diode (D1, D2, D3, D4, D5, D6) thereof, the two-winding transformer T1 of a coupled in reverse wi, an output inductor L1 and output filter capacitor C3, six power diodes (D7, D8, D9, D10, D11, D12).The collector electrode of the first power switch tube S 1 is connected with the positive pole of the first input power V1 with the positive pole of the negative electrode of the 4th power diode D10 and the first input filter capacitor C1, the emitter of the 4th power switch tube S 4 is connected with the negative pole of the second input power V2 with the negative pole of the anode of the first power diode D7 and the second input filter capacitor C2, the negative pole of the first input filter capacitor C1 is connected with the positive pole of the second input power V2 with the positive pole of the second input filter capacitor C2 with the negative pole of the first input power V1, forms mid point earth potential.The emitter of the first power switch tube S 1 is connected with the negative electrode of the 5th power diode D11 with the collector electrode of the second power switch tube S 2, the emitter of the 3rd power switch tube S 3 is connected with the anode of the 6th power diode D12 with the collector electrode of the 4th power switch tube S 4, and the anode of the 5th power diode D11 is connected with midpoint potential with the negative electrode of the 6th power diode D12.The negative electrode of the first power diode D7 is connected with the emitter of the 5th power switch tube S 5 with the anode of the second power diode D8, the negative electrode of the 3rd power diode D9 is connected with the collector electrode of the 6th power switch tube S 6 with the anode of the 4th power diode D10, and the collector electrode of the 5th power switch tube S 5 is connected with midpoint potential with the emitter of the 6th power switch tube S 6.The emitter of the second power switch tube S 2 is connected with the Same Name of Ends of the negative electrode of the second power diode D8 with coupled in reverse wi transformer T1 first winding, and the collector electrode of the 3rd power switch tube S 3 is connected with the different name end of the anode of the 3rd power diode D9 with coupled in reverse wi transformer T1 second winding.One end of output inductor L1 is connected with the different name end of coupled in reverse wi transformer T1 first winding and the Same Name of Ends of the second winding, the other end is connected with one end of output filter capacitor C3 and output loading R1, and the other end of output filter capacitor C3 and output loading R1 is connected with mid point earth potential.

In order to simplicity of exposition and the usual statement meeting this area, numeral or the alphabetic flag of the components and parts related in below describing represent identical implication with foregoing tags, when not affecting those skilled in the art and understanding, indivedual place does not only provide parts full name with mark.

Below citing is only.

During the duty ratio D<0.5 of the first power switch tube S 1, in the complete sinusoidal wave positive period, low voltage stress diode voltage Clamp many level single phase half bridge inverter of novel three-terminal switch network is used to there are four operation modes, as shown in Figure 1B.

T0 ~ t1: power switch pipe (S1, S2, S3) conducting, S6 start shutoff, power diode D12 conducting, power diode (D9, D10) shared d7, D8 shared V _in, " b " point voltage is input voltage V _inpositive pole, " c " point voltage be input filter capacitor (C1, C2) mid point earth potential, the therefore both end voltage of coupled in reverse wi transformer T1 meanwhile, the mid point " a " that is connected with output inductor of coupled in reverse wi transformer T1 is to the earthy voltage difference of mid point this voltage difference is called inversion mid-point voltage.

T1 ~ t2: power switch tube S 1 starts shutoff, S2 and S3 continues conducting afterflow, power diode D11, D12 conducting, " b " point voltage is mid point earth potential, " c " point voltage is also mid point earth potential, therefore the both end voltage V of coupled in reverse wi transformer T1 _bc=0.Meanwhile, inversion mid-point voltage V _a0=0.

T2 ~ t3: power switch tube S 2 continues conducting, S3 and also starts to turn off, and power diode D11 continues conducting, D9 and D10 starts conducting afterflow, and " b " point voltage is mid point earth potential, " c " point voltage is input voltage V _inpositive pole, the therefore both end voltage of coupled in reverse wi transformer T1 meanwhile, inversion mid-point voltage

T3 ~ t4: power switch tube S 2 continues conducting, S3 and S6 starts conducting, power diode D9 and D11 continue conducting, D10 starts shutoff, D12 starts conducting, and D10 bears at two ends " b " point voltage is mid point earth potential, " c " point voltage is also mid point earth potential, therefore the both end voltage V of coupled in reverse wi transformer T1 _bc=0.Meanwhile, inversion mid-point voltage V _a0=0.

As can be seen from above analytic process, output voltage:

$\begin{array}{c}{V}_{\mathrm{out}}=\frac{2}{T}[{\&Integral;}_{t0}^{t1}\frac{1}{4}\&CenterDot;V_{\mathrm{in}}\&CenterDot;\mathrm{dt}+{\&Integral;}_{t1}^{t2}0\mathrm{dt}]\\ =\frac{2}{T}(\frac{1}{4}\&CenterDot;V_{\mathrm{in}}\&CenterDot;D\&CenterDot;T)\\ =\frac{1}{2}\&CenterDot;D\&CenterDot;V_{\mathrm{in}}\end{array}$

The negative half period operation principle of sine wave output voltage is similar to above-mentioned, does not repeat them here.

During the duty ratio D>0.5 of power switch tube S 1, in complete work period, low voltage stress diode voltage Clamp many level single phase half bridge inverter of novel three-terminal switch network is used to there are four operation modes, as shown in Figure 1 C.

T0 ~ t1: power switch tube S 1, S2, S3 conducting, S6 start conducting, power diode D12 conducting, power diode D9 starts conducting, D10 starts to turn off, and D10 bears at two ends d7, D8 shared V _in, " b " point voltage is input voltage V _inpositive pole, " c " point voltage be input filter capacitor C1, C2 mid point earth potential, the therefore both end voltage of coupled in reverse wi transformer T1 meanwhile, the mid point " a " that is connected with output inductor of coupled in reverse wi transformer T1 is to the earthy voltage difference of mid point this voltage difference is called inversion mid-point voltage.

T1 ~ t2:S1 and S2 continues conducting afterflow, power switch tube S 3 starts shutoff, power diode D9 continues conducting, D10 starts conducting afterflow, and " b " point voltage is input voltage V _inpositive pole, " c " point voltage be also input voltage V _inpositive pole, the therefore both end voltage V of coupled in reverse wi transformer T1 _bc=0.Meanwhile, inversion mid-point voltage

T2 ~ t3: power switch tube S 2 continues conducting, S1 and also starts to turn off, and power diode D9 and D10 continues conducting, D11 starts conducting afterflow, and " b " point voltage is mid point earth potential, " c " point voltage is input voltage V _inpositive pole, the therefore both end voltage of coupled in reverse wi transformer T1 meanwhile, inversion mid-point voltage

T3 ~ t4: power switch tube S 2 continues conducting, S1 starts conducting, power diode D9 and D10 continue conducting, and " b " point voltage is input voltage V _inpositive pole, " c " point voltage be also input voltage V _inpositive pole, the therefore both end voltage V of coupled in reverse wi transformer T1 _bc=0.Meanwhile, inversion mid-point voltage

As can be seen from above analytic process, output voltage:

$\begin{array}{c}{V}_{\mathrm{out}}=\frac{2}{T}[{\&Integral;}_{t0}^{t1}\frac{1}{4}\&CenterDot;V_{\mathrm{in}}\&CenterDot;\mathrm{dt}+{\&Integral;}_{t1}^{t2}\frac{1}{2}\&CenterDot;V_{\mathrm{in}}\&CenterDot;\mathrm{dt}]\\ =\frac{2}{T}\&CenterDot;\frac{1}{4}\&CenterDot;V_{\mathrm{in}}[(1-D)\&CenterDot;T+2\&CenterDot;(D\&CenterDot;T-\frac{T}{2})\\ =\frac{1}{2}\&CenterDot;D\&CenterDot;V_{\mathrm{in}}\end{array}$

The negative half period operation principle of sine wave output voltage is similar to above-mentioned, does not repeat them here.

The computing formula form of the positive and negative half cycle of output voltage is identical, and unified control algolithm can be adopted to realize.

Inversion mid-point voltage V _a0can realize five kinds of level.

Low voltage stress diode voltage Clamp many level single-phase full-bridge inverter of the novel three-terminal switch network of use of Fig. 2, the another kind of Fig. 3 uses low voltage stress diode voltage Clamp many level single-phase full-bridge inverter of novel three-terminal switch network, the output of the novel three-terminal switch network of use of Fig. 4 is without low voltage stress diode voltage Clamp many level three-phase inverter of neutral line N, many level single phase half bridge inverter of basic functional principle, the drive singal adopted and Fig. 1 is similar, does not repeat them here.Fig. 4 also easily extensible to the low voltage stress diode voltage Clamp many level three-phase inverter using the output of novel three-terminal switch network to have neutral line N.In addition, can to the expansion of diode voltage Clamp N level topology by above-mentioned diode voltage Clamp three level basic topology, forming diode voltage Clamp N level topology can be the many level topologys of various modified model or universal diode voltage Clamp.Components and parts symbol in figure is identical with Fig. 1, and wherein C is electric capacity, and S is power switch pipe, and D is diode (same as in figure 1, to have body diode and the power diode of power switch pipe), and T is coupled in reverse wi transformer, and L is inductance, and R is load.Owing to being explicit for a person skilled in the art, do not repeat them here.

Present invention uses six power switch pipes, six power diodes and a coupled in reverse wi transformer and form three-terminal switch network, compare with conventional diode Clamp multi-level inverse conversion topology, without the need to arranging dead band and work can be opened simultaneously between the power switch pipe of upper and lower brachium pontis, realize many level at inversion mid point to export, thus improve harmonic wave of output voltage, reduce size and the volume of output inductor, reduce switching device loss, the therefore systematic function of reduction system material cost, raising inverter.

Present invention uses a three-terminal switch network and an output inductor, alternatively, independently output inductor accessible site is in the two-winding transformer of coupled in reverse wi, the leakage inductance of the two-winding transformer of coupled in reverse wi can be used as output inductor in other words.

The power switch pipe described in the present invention can be insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), mos field effect transistor (Metal-Oxide-Semiconductor Field Effect Transistor, MOSFET), gate pole can break thyristor (GateTurn-off Thyristor, GTO) or other suitable switching devices etc. arbitrarily.

Low voltage stress diode-clamped many level single-phase inverter of the novel three-terminal switch network of use proposed by the invention and three-phase inverter, alternatively, can connect a single-phase or three-phase transformer after single-phase or three-phase voltage output filtering.

The inverter of embodiments of the invention or inverter system can be widely used in DC-AC power inversion device (DC/AC), such as uninterrupted power supply (UPS), photovoltaic DC-to-AC converter, wind energy converter, industrial frequency transformer and fuel cell power source electricity generation system etc.

The present invention adopts coupling inductance PWM phase-shifting carrier wave technology, the not only output level number of easily extensible conventional diode Clamp multi-electrical level inverter, the loss of reduction power device, and significantly reduce output inductor volume, loss and cost, improve the efficiency of inverter, improve inverter output voltage harmonic wave and the quality of power supply, reduce the complete machine cost of inverter, therefore there are great using value and wide market prospects.

These are only preferred embodiment of the present invention, but be to be understood that and can carry out various change when not exceeding the spirit and scope of the present invention limited by appended claim, substituting and conversion.And scope of the present invention is not limited only to the specific embodiment of process, equipment, means, method and step described by specification.One of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use perform the function substantially identical with the corresponding embodiment at this or obtain and its substantially identical result, existing and that will be developed in the future process, equipment, means, method or step according to the present invention.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.

Claims (9)

1. use low voltage stress diode voltage Clamp many level single phase half bridge inverter of novel three-terminal switch network, it is characterized in that comprising: two input powers, two input filter capacitors, six power switch pipes and body diode thereof, the two-winding transformer of a coupled in reverse wi, an output inductor and an output filter capacitor, and six power diodes; Wherein the collector electrode of the first power switch pipe is connected with the positive pole of the first input power with the negative electrode of the 4th power diode and the positive pole of the first input filter capacitor, the emitter of the 4th power switch pipe is connected with the negative pole of the second input power with the negative pole of the anode of the first power diode and the second input filter capacitor, the negative pole of the first input filter capacitor is connected with the positive pole of the second input power with the positive pole of the second input filter capacitor with the negative pole of the first input power, forms mid point earth potential; The emitter of the first power switch pipe is connected with the negative electrode of the collector electrode of the second power switch pipe with the 5th power diode, the emitter of the 3rd power switch pipe is connected with the anode of the 6th power diode with the collector electrode of the 4th power switch pipe, and the anode of the 5th power diode is connected with midpoint potential with the negative electrode of the 6th power diode; The negative electrode of the first power diode is connected with the emitter of the anode of the second power diode with the 5th power switch pipe, the negative electrode of the 3rd power diode is connected with the collector electrode of the 6th power switch pipe with the anode of the 4th power diode, and the collector electrode of the 5th power switch pipe is connected with midpoint potential with the emitter of the 6th power switch pipe; The emitter of the second power switch pipe is connected with the Same Name of Ends of the negative electrode of the second power diode with coupled in reverse wi transformer first winding, and the collector electrode of the 3rd power switch pipe is connected with the different name end of coupled in reverse wi transformer second winding with the anode of the 3rd power diode; One end of output inductor is connected with the different name end of coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, the other end is connected with one end of output filter capacitor and output loading, and the other end of output filter capacitor and output loading is connected with mid point earth potential; Six power switch pipes are driven by six drive singal, wherein the first drive singal is modulated by the first modulating wave and first carrier and is formed, second drive singal is formed by the second modulating wave and the second carrier modulation, 3rd drive singal is formed by the 3rd modulating wave and the 3rd carrier modulation, four-wheel drive signal is formed by the 4th modulating wave and the 4th carrier modulation, and the 5th drive singal and the 6th drive singal are without the need to modulating; First modulating wave is identical with the phase place of the 3rd modulating wave, the phase place of first carrier and the phase 180 degree of the 3rd carrier wave, and the second modulating wave and the 4th modulating wave are power frequency sine wave, the phase place of the second carrier wave and the phase 180 degree of the 4th carrier wave;

Described output inductor can also be integrated in the two-winding transformer of coupled in reverse wi, or the leakage inductance of the two-winding transformer of coupled in reverse wi is used as described output inductor; Or without the need to output inductor and/or output filter capacitor, form filter circuit by inductive load itself; Described two input powers can also replace with an input power.

2. low voltage stress diode voltage Clamp many level single phase half bridge inverter of the novel three-terminal switch network of use according to claim 1, characterized by further comprising second level filter inductance, be connected to the output be made up of described output inductor and output filter capacitor, to form LCL filter circuit.

3. use low voltage stress diode voltage Clamp many level single-phase full-bridge inverter of novel three-terminal switch network, it is characterized in that the brachium pontis comprising two low voltage stress diode voltage Clamp many level single phase half bridge inverters according to claim 1, specifically comprise: two input powers, two input filter capacitors, 12 power switch pipes and body diode thereof, the two-winding transformer of two coupled in reverse wi, two output inductors and an output filter capacitor, 12 power diodes, the collector electrode of the first power switch pipe is connected with the positive pole of the first input power with the positive pole of the first input filter capacitor with the negative electrode of the tenth power diode with the collector electrode of the negative electrode of the 4th power diode and the 7th power switch pipe, the emitter of the 4th power switch pipe is connected with the negative pole of the second input power with the negative pole of the second input filter capacitor with the anode of the 7th power diode with the emitter of the anode of the first power diode and the tenth power switch pipe, the negative pole of the first input filter capacitor is connected with the positive pole of the second input power with the positive pole of the second input filter capacitor with the negative pole of the first input power, form mid point earth potential, the emitter of the first power switch pipe is connected with the negative electrode of the collector electrode of the second power switch pipe with the 5th power diode, the emitter of the 3rd power switch pipe is connected with the anode of the 6th power diode with the collector electrode of the 4th power switch pipe, and the anode of the 5th power diode is connected with midpoint potential with the negative electrode of the 6th power diode, the negative electrode of the first power diode is connected with the emitter of the anode of the second power diode with the 5th power switch pipe, the negative electrode of the 3rd power diode is connected with the collector electrode of the 6th power switch pipe with the anode of the 4th power diode, and the collector electrode of the 5th power switch pipe is connected with midpoint potential with the emitter of the 6th power switch pipe, the emitter of the second power switch pipe is connected with the Same Name of Ends of the negative electrode of the second power diode with the first coupled in reverse wi transformer first winding, and the collector electrode of the 3rd power switch pipe is connected with the different name end of the anode of the 3rd power diode with the first coupled in reverse wi transformer second winding, the emitter of the 7th power switch pipe is connected with the negative electrode of the 11 power diode with the collector electrode of the 8th power switch pipe, the emitter of the 9th power switch pipe is connected with the anode of the 12 power diode with the collector electrode of the tenth power switch pipe, and the anode of the 11 power diode is connected with midpoint potential with the negative electrode of the 12 power diode, the negative electrode of the 7th power diode is connected with the emitter of the 11 power switch pipe with the anode of the 8th power diode, the negative electrode of the 9th power diode is connected with the collector electrode of the 12 power switch pipe with the anode of the tenth power diode, and the collector electrode of the 11 power switch pipe is connected with midpoint potential with the emitter of the 12 power switch pipe, the emitter of the 8th power switch pipe is connected with the Same Name of Ends of the negative electrode of the 8th power diode with the second coupled in reverse wi transformer first winding, and the collector electrode of the 9th power switch pipe is connected with the different name end of the anode of the 9th power diode with the second coupled in reverse wi transformer second winding, one end of first output inductor is connected with the different name end of the first coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, and the other end is connected with one end of output filter capacitor and output loading, one end of second output inductor is connected with the different name end of the second coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, and the other end is connected with the other end of output filter capacitor and output loading, 12 power switch pipes are driven by 12 drive singal, wherein the first drive singal is modulated by the first modulating wave and first carrier and is formed, second drive singal is formed by the second modulating wave and the second carrier modulation, 3rd drive singal is formed by the 3rd modulating wave and the 3rd carrier modulation, four-wheel drive signal is formed by the 4th modulating wave and the 4th carrier modulation, 5th drive singal and the 6th drive singal are without the need to modulating, 7th drive singal is formed by the 7th modulating wave and the 7th carrier modulation, 8th drive singal is formed by the 8th modulating wave and the 8th carrier modulation, 9th drive singal is formed by the 9th modulating wave and the 9th carrier modulation, tenth drive singal is formed by the tenth modulating wave and the tenth carrier modulation, 11 drive singal and the tenth two driving signal are without the need to modulating, described first modulating wave is identical with the phase place of the 3rd modulating wave, the phase place of first carrier and the phase 180 degree of the 3rd carrier wave, and the second modulating wave and the 4th modulating wave are power frequency sine wave, the phase place of the second carrier wave and the phase 180 degree of the 4th carrier wave, 7th modulating wave is identical with the phase place of the 9th modulating wave, the phase place of the 7th carrier wave and the phase 180 degree of the 9th carrier wave, and the 8th modulating wave and the 12 modulating wave are power frequency sine wave, the phase place of the 8th carrier wave and the phase 180 degree of the tenth nd carrier, first modulating wave is identical with the phase place of the 7th modulating wave, the phase place of first carrier and the phase 180 degree of the 7th carrier wave, and the second modulating wave is identical with the phase place of carrier wave with the 8th modulating wave,

Described output inductor can also be integrated in the two-winding transformer of coupled in reverse wi, or the leakage inductance of the two-winding transformer of coupled in reverse wi is used as described output inductor; Or only use an output inductor or without the need to output inductor and/or no-output filter capacitor, form filter circuit by inductive load itself; Described two input powers can also replace with an input power.

4. low voltage stress diode voltage Clamp many level single-phase full-bridge inverter of the novel three-terminal switch network of use according to claim 3, characterized by further comprising second level filter inductance, be connected to the output be made up of described output inductor and output filter capacitor, to form LCL filter circuit.

5. use another kind of low voltage stress diode voltage Clamp many level single-phase full-bridge inverter of novel three-terminal switch network, it is characterized in that the brachium pontis and the conventional diode Clamp tri-level inversion brachium pontis that comprise low voltage stress diode voltage Clamp many level single phase half bridge inverter according to claim 1, specifically comprise: two input powers, two input filter capacitors, ten power switch pipes and body diode thereof, the two-winding transformer of a coupled in reverse wi, an output inductor and an output filter capacitor, eight power diodes, the collector electrode of the first power switch pipe is connected with the positive pole of the first input power with the positive pole of the first input filter capacitor with the negative electrode of the 4th power diode and the collector electrode of the 7th power switch pipe, the emitter of the 4th power switch pipe is connected with the negative pole of the second input power with the negative pole of the second input filter capacitor with the anode of the first power diode and the emitter of the tenth power switch pipe, the negative pole of the first input filter capacitor is connected with the positive pole of the second input power with the positive pole of the second input filter capacitor with the negative pole of the first input power, forms mid point earth potential, the emitter of the first power switch pipe is connected with the negative electrode of the collector electrode of the second power switch pipe with the 5th power diode, the emitter of the 3rd power switch pipe is connected with the anode of the 6th power diode with the collector electrode of the 4th power switch pipe, and the anode of the 5th power diode is connected with midpoint potential with the negative electrode of the 6th power diode, the negative electrode of the first power diode is connected with the emitter of the anode of the second power diode with the 5th power switch pipe, the negative electrode of the 3rd power diode is connected with the collector electrode of the 6th power switch pipe with the anode of the 4th power diode, and the collector electrode of the 5th power switch pipe is connected with midpoint potential with the emitter of the 6th power switch pipe, the emitter of the second power switch pipe is connected with the Same Name of Ends of the negative electrode of the second power diode with coupled in reverse wi transformer first winding, and the collector electrode of the 3rd power switch pipe is connected with the different name end of coupled in reverse wi transformer second winding with the anode of the 3rd power diode, the emitter of the 7th power switch pipe is connected with the negative electrode of the 7th power diode with the collector electrode of the 8th power switch pipe, the emitter of the 9th power switch pipe is connected with the anode of the 8th power diode with the collector electrode of the tenth power switch pipe, and the anode of the 7th power diode is connected with midpoint potential with the negative electrode of the 8th power diode, the emitter of the 8th power switch pipe is connected with one end of output filter capacitor and output loading with the collector electrode of the 8th power switch pipe, one end of output inductor is connected with the different name end of coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, and the other end is connected with the other end of output filter capacitor and output loading, ten power switch pipes are driven by ten drive singal, wherein the first drive singal is modulated by the first modulating wave and first carrier and is formed, second drive singal is formed by the second modulating wave and the second carrier modulation, 3rd drive singal is formed by the 3rd modulating wave and the 3rd carrier modulation, four-wheel drive signal is formed by the 4th modulating wave and the 4th carrier modulation, 5th drive singal and the 6th drive singal are without the need to modulating, 7th drive singal is formed by the 7th modulating wave and the 7th carrier modulation, 8th drive singal is formed by the 8th modulating wave and the 8th carrier modulation, 9th drive singal is formed by the 9th modulating wave and the 9th carrier modulation, tenth drive singal is formed by the tenth modulating wave and the tenth carrier modulation, described first modulating wave is identical with the phase place of the 3rd modulating wave, the phase place of first carrier and the phase 180 degree of the 3rd carrier wave, and the second modulating wave and the 4th modulating wave are power frequency sine wave, the phase place of the second carrier wave and the phase 180 degree of the 4th carrier wave, 7th modulating wave is identical with the phase place of the 9th modulating wave, the phase place of the 7th carrier wave and the phase 180 degree of the 9th carrier wave, and the 8th modulating wave and the tenth modulating wave are power frequency sine wave, the phase place of the 8th carrier wave and the phase 180 degree of the tenth carrier wave, first modulating wave is identical with the phase place of the 7th modulating wave, the phase place of first carrier and the phase 180 degree of the 7th carrier wave, and the second modulating wave is identical with the phase place of carrier wave with the 8th modulating wave,

Described output inductor can also be integrated in the two-winding transformer of coupled in reverse wi, or the leakage inductance of the two-winding transformer of coupled in reverse wi is used as described output inductor; Or only use an output inductor or without the need to output inductor and/or no-output filter capacitor, form filter circuit by inductive load itself; Described two input powers can also replace with an input power.

6. another kind of low voltage stress diode voltage Clamp many level single-phase full-bridge inverter of use according to claim 5 novel three-terminal switch network, characterized by further comprising second level filter inductance, be connected to the output be made up of described output inductor and output filter capacitor, to form LCL filter circuit.

7. use low voltage stress diode voltage Clamp many level three-phase inverter of novel three-terminal switch network, it is characterized in that the brachium pontis comprising three low voltage stress diode voltage Clamp many level single phase half bridge inverters according to claim 1, specifically comprise: two input powers, two input filter capacitors, 18 power switch pipes and body diode thereof, the two-winding transformer of three coupled in reverse wi, three output inductors and three output filter capacitors, 18 power diodes, the collector electrode of the first power switch pipe is connected with the positive pole of the first input power with the positive pole of the first input filter capacitor with the negative electrode of the 6th power diode with the negative electrode of the tenth power diode and the collector electrode of the 11 power switch pipe with the collector electrode of the negative electrode of the 4th power diode and the 7th power switch pipe, the emitter of the 4th power switch pipe is connected with the negative pole of the second input power with the negative pole of the second input filter capacitor with the anode of the 13 power diode with the anode of the 7th power diode and the emitter of the 16 power switch pipe with the emitter of the anode of the first power diode and the tenth power switch pipe, the negative pole of the first input filter capacitor is connected with the positive pole of the second input power with the positive pole of the second input filter capacitor with the negative pole of the first input power, form mid point earth potential, the emitter of the first power switch pipe is connected with the negative electrode of the collector electrode of the second power switch pipe with the 5th power diode, the emitter of the 3rd power switch pipe is connected with the anode of the 6th power diode with the collector electrode of the 4th power switch pipe, and the anode of the 5th power diode is connected with midpoint potential with the negative electrode of the 6th power diode, the negative electrode of the first power diode is connected with the emitter of the anode of the second power diode with the 5th power switch pipe, the negative electrode of the 3rd power diode is connected with the collector electrode of the 6th power switch pipe with the anode of the 4th power diode, and the collector electrode of the 5th power switch pipe is connected with midpoint potential with the emitter of the 6th power switch pipe, the emitter of the second power switch pipe is connected with the Same Name of Ends of the negative electrode of the second power diode with the first coupled in reverse wi transformer first winding, and the collector electrode of the 3rd power switch pipe is connected with the different name end of the anode of the 3rd power diode with the first coupled in reverse wi transformer second winding, the emitter of the 7th power switch pipe is connected with the negative electrode of the 11 power diode with the collector electrode of the 8th power switch pipe, the emitter of the 9th power switch pipe is connected with the anode of the 12 power diode with the collector electrode of the tenth power switch pipe, and the anode of the 11 power diode is connected with midpoint potential with the negative electrode of the 12 power diode, the negative electrode of the 7th power diode is connected with the emitter of the 11 power switch pipe with the anode of the 8th power diode, the negative electrode of the 9th power diode is connected with the collector electrode of the 12 power switch pipe with the anode of the tenth power diode, and the collector electrode of the 11 power switch pipe is connected with midpoint potential with the emitter of the 12 power switch pipe, the emitter of the 8th power switch pipe is connected with the Same Name of Ends of the negative electrode of the 8th power diode with the second coupled in reverse wi transformer first winding, and the collector electrode of the 9th power switch pipe is connected with the different name end of the anode of the 9th power diode with the second coupled in reverse wi transformer second winding, the emitter of the 13 power switch pipe is connected with the negative electrode of the 17 power diode with the collector electrode of the 14 power switch pipe, the emitter of the 15 power switch pipe is connected with the anode of the 18 power diode with the collector electrode of the 16 power switch pipe, and the anode of the 17 power diode is connected with midpoint potential with the negative electrode of the 18 power diode, the negative electrode of the 13 power diode is connected with the emitter of the 17 power switch pipe with the anode of the 14 power diode, the negative electrode of the 15 power diode is connected with the collector electrode of the 18 power switch pipe with the anode of the 16 power diode, and the collector electrode of the 17 power switch pipe is connected with midpoint potential with the emitter of the 18 power switch pipe, the emitter of the 14 power switch pipe is connected with the Same Name of Ends of the negative electrode of the 14 power diode with the 3rd coupled in reverse wi transformer first winding, and the collector electrode of the 15 power switch pipe is connected with the different name end of the anode of the 15 power diode with the 3rd coupled in reverse wi transformer second winding, one end of first output inductor is connected with the different name end of the first coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, one end of second output inductor is connected with the different name end of the second coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, and one end of the 3rd output inductor is connected with the different name end of the 3rd coupled in reverse wi transformer first winding and the Same Name of Ends of the second winding, the other end of the first output inductor realizes A phase through the first output filter capacitor and exports, the other end of the second output inductor realizes B phase through the second output filter capacitor and exports, and the other end of the 3rd output inductor realizes C phase through the 3rd output filter capacitor and exports, 18 power switch pipes are driven by 18 drive singal, wherein the first drive singal is modulated by the first modulating wave and first carrier and is formed, second drive singal is formed by the second modulating wave and the second carrier modulation, 3rd drive singal is formed by the 3rd modulating wave and the 3rd carrier modulation, four-wheel drive signal is formed by the 4th modulating wave and the 4th carrier modulation, 5th drive singal is formed by the 5th modulating wave and the 5th carrier modulation, 6th drive singal is formed by the 6th modulating wave and the 6th carrier modulation, 7th drive singal is formed by the 7th modulating wave and the 7th carrier modulation, 8th drive singal is formed by the 8th modulating wave and the 8th carrier modulation, 9th drive singal is formed by the 9th modulating wave and the 9th carrier modulation, tenth drive singal is formed by the tenth modulating wave and the tenth carrier modulation, 11 drive singal is formed by the 11 modulating wave and the 11 carrier modulation, tenth two driving signal is modulated by the 12 modulating wave and the tenth nd carrier and is formed, 13 drive singal and the tenth four-wheel drive signal are without the need to modulating, 15 drive singal and the 16 drive singal are without the need to modulating, 17 drive singal and the 18 drive singal are without the need to modulating, described first modulating wave is identical with the phase place of the 3rd modulating wave, the phase place of first carrier and the phase 180 degree of the 3rd carrier wave, and the second modulating wave and the 4th modulating wave are power frequency sine wave, the phase place of the second carrier wave and the phase 180 degree of the 4th carrier wave, 5th modulating wave is identical with the phase place of the 7th modulating wave, the phase place of the 5th carrier wave and the phase 180 degree of the 7th carrier wave, and the 6th modulating wave and the 8th modulating wave are power frequency sine wave, the phase place of the 6th carrier wave and the phase 180 degree of the 8th carrier wave, 9th modulating wave is identical with the phase place of the 11 modulating wave, the phase place of the 9th carrier wave and the phase 180 degree of the 11 carrier wave, and the tenth modulating wave and the 12 modulating wave are power frequency sine wave, the phase place of the tenth carrier wave and the phase 180 degree of the tenth nd carrier, first modulating wave is identical with the phase place that the 5th modulation involves the 9th modulating wave, the phase place of first carrier and the phase place of the 5th carrier wave and the 9th carrier wave differ 180 degree separately, second is identical with the phase place of carrier wave with the 6th and the tenth modulating wave, the phase 120 degree of the phase place of described first carrier, the phase place of described 5th carrier wave and described 9th carrier wave,

Described output inductor can also be integrated in the two-winding transformer of coupled in reverse wi, or the leakage inductance of the two-winding transformer of coupled in reverse wi is used as output inductor; Or without the need to output inductor and/or without the need to output filter capacitor, form filter circuit by inductive load itself; Described two input powers can also replace with an input power.

8. low voltage stress diode voltage Clamp many level three-phase inverter of the novel three-terminal switch network of use according to claim 7, characterized by further comprising second level filter inductance, be connected to the output be made up of described output inductor and output filter capacitor, to form LCL filter circuit.

9. low voltage stress diode voltage Clamp many level three-phase inverter of the novel three-terminal switch network of use according to claim 7, is characterized in that this inverter can adapt to have the neutral line (N) or the inverter system without the neutral line (N).