CN102904471A - Inverter and power supply equipment - Google Patents
Inverter and power supply equipment Download PDFInfo
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- CN102904471A CN102904471A CN2012103743736A CN201210374373A CN102904471A CN 102904471 A CN102904471 A CN 102904471A CN 2012103743736 A CN2012103743736 A CN 2012103743736A CN 201210374373 A CN201210374373 A CN 201210374373A CN 102904471 A CN102904471 A CN 102904471A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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Abstract
The embodiment of the invention discloses an inverter. A switching tube circuit is added on the basis of an existing inverter, and the switching tube circuit is opened and closed in advance in comparison with a power tube, so that the switching loss of the power tube in the inverter is reduced.
Description
Technical field
The present invention relates to a kind of electronic circuit field, relate in particular to a kind of inverter and power supply unit.
Background technology
Inverter is a kind of direct current to be become the circuit of interchange, such as multi-electrical level inverter.The a series of advantages such as the switching frequency that power output is large, the devices switch frequency is low, inverter is equivalent is high, output harmonic wave is little because multi-electrical level inverter has, rapid dynamic response speed, Electro Magnetic Compatibility are good, received increasing concern, and got and study widely and use.
The basic thought of multi-electrical level inverter be basis at certain main circuit topological structure by different switch combinations, obtain multistage staircase waveform and export equivalent sine wave.And five-electrical level inverter namely refers to obtain the output of Pyatyi staircase waveform.
There is polytype in existing five level inverse conversion systems, are illustrated in figure 1 as wherein a kind ofly, and it comprises boost (Boost) circuit and five level topological structures.Wherein the Boost circuit promotes VD; And five level topological structures are converted to alternating voltage to direct voltage, then offer load or electrical network.
But the power switch pipe of existing five-electrical level inverter is generally operational in voltage and/or the higher state of electric current, on-state loss (or claiming switching loss) to power device is larger, as, also will be larger to the loss of power tube, limited to a certain extent the raising of system effectiveness.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of inverter is provided.Can reduce the switching loss of power tube in the inverter.
In order to solve the problems of the technologies described above, on the one hand, the embodiment of the invention provides a kind of inverter, comprise: DC power supply, booster circuit, the hybrid five-level topological structure, described booster circuit is connected in parallel on DC power supply the two poles of the earth, described hybrid five-level topological structure is connected in parallel on two outputs of described booster circuit, the output output AC electricity of described hybrid five-level topological structure, described booster circuit comprises symmetrical two bypass diode D1 and D2, and described hybrid five-level topological structure comprises switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 and diode D3, D4, D5, D6;
D3, the Q5, Q6 and the D4 that connect successively series connection at the two poles of the earth of described DC power supply;
Q1, Q5, Q6 and Q2 rear composition the first brachium pontis of connecting successively is connected in parallel on two outputs of described booster circuit, is connected in parallel on the negative pole of D1 and the positive pole of D4 after Q3, Q7, Q8, Q4 connect successively;
Be connected diode D5, the plus earth of D5 at Q3 with tie point between the Q7;
Be connected diode D6, the plus earth of D6 at Q4 with tie point between the Q8.
On the other hand, the embodiment of the invention also provides a kind of inverter, comprise: DC power supply, booster circuit, the hybrid five-level topological structure, described booster circuit is connected in parallel on DC power supply the two poles of the earth, described hybrid five-level topological structure is connected in parallel on two outputs of described booster circuit, the output output AC electricity of described hybrid five-level topological structure, described booster circuit comprises symmetrical two bypass diode D1 and D2, and described hybrid five-level topological structure comprises switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 and diode D3, D4, D5, D6;
D3, the Q5, Q6 and the D4 that connect successively series connection at the two poles of the earth of described DC power supply;
Q1, Q5, Q6 and Q2 rear composition the first brachium pontis of connecting successively is connected in parallel on two outputs of described booster circuit, is connected in parallel on the negative pole of the positive pole of D3 and D4 after Q3, Q7, Q8, Q4 connect successively or is connected in parallel on the negative pole of D1 and the negative pole of D4;
Be connected diode D5, the plus earth of D5 at Q3 with tie point between the Q7;
Be connected diode D6, the plus earth of D6 at Q4 with tie point between the Q8.
Further, in above-mentioned inverter, also can comprise control unit, be used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that
When the higher and booster circuit of voltage was not worked, the input voltage of DC power supply was through Q1, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of three level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q2;
When the work of the lower and booster circuit of voltage, the input voltage one tunnel of DC power supply is input to Q5, and another road is input to Q1 after boosting through booster circuit, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of five level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q6.
Wherein, Q3, Q4 are metal-oxide half field effect transistor, and Q1, Q2, Q5, Q6, Q7, Q8 are insulated gate bipolar transistor.
Further, described inverter also comprises:
Power relay RL1, RL1 are connected in parallel on the bypass diode D1;
Power relay RL2, RL2 are connected in parallel on the bypass diode D2;
Described control unit also is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that when the higher booster circuit of voltage was not worked, the input voltage of DC power supply was input to Q1 through RL1, is input to RL2 through Q2; When the low booster circuit work of voltage, the input voltage one tunnel of DC power supply is input to Q5 through D3, is input to D4 through Q6, and another road is input to Q1 by RL1 after boosting through booster circuit, is input to RL2 through Q2.
Further, described inverter also comprises:
Power relay RL3, RL3 are connected in parallel on the described diode D3;
Power relay RL4, RL4 are connected in parallel on the described diode D4;
Described control unit also is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that when the higher booster circuit of voltage was not worked, the input voltage of DC power supply was input to Q1 through RL1, is input to RL2 through Q2; When the low booster circuit work of voltage, the input voltage one tunnel of DC power supply is input to Q5 through RL3, outputs to RL4 through Q6, and another road is input to Q1 by RL1 after boosting through booster circuit, is input to RL2 through Q2.
Again on the one hand, the embodiment of the invention also provides a kind of power supply unit, comprise the DC power supply apparatus that direct current output is provided, described direct current output is converted to the inverter that exchanges output, and the load of described interchange output driving, described inverter comprises: booster circuit, the hybrid five-level topological structure, described booster circuit is connected in parallel on the two poles of the earth of the direct current output of described DC power supply apparatus, described hybrid five-level topological structure is connected in parallel on two outputs of described booster circuit, the output of described hybrid five-level topological structure connects described load, described booster circuit comprises symmetrical two bypass diode D1 and D2, and described hybrid five-level topological structure comprises switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 and diode D3, D4, D5, D6;
D3, the Q5, Q6 and the D4 that connect successively series connection at the two poles of the earth of described direct current output;
Q1, Q5, Q6 and Q2 rear composition the first brachium pontis of connecting successively is connected in parallel on two outputs of described booster circuit, is connected in parallel on the negative pole of D1 and the positive pole of D4 after Q3, Q7, Q8, Q4 connect successively;
Be connected diode D5, the plus earth of D5 at Q3 with tie point between the Q7;
Be connected diode D6, the plus earth of D6 at Q4 with tie point between the Q8.
In the power supply unit in another embodiment of the present invention, not to be connected in parallel on the negative pole of D1 and the positive pole of D4 after described Q3, Q7, Q8, Q4 connect successively, but be connected in parallel on the negative pole of the positive pole of D3 and D4 or be connected in parallel on the negative pole of D1 and the negative pole of D4.
Further, described inverter also comprises control unit, is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that
When the higher and booster circuit of voltage was not worked, the voltage of described direct current output was through Q1, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of three level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q2;
When the work of the lower and booster circuit of voltage, the voltage one tunnel of described direct current output is input to Q5, and another road is input to Q1 after boosting through booster circuit, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of five level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q6.
Concrete, Q3, Q4 are metal-oxide half field effect transistor, Q1, Q2, Q5, Q6, Q7, Q8 are insulated gate bipolar transistor.
In embodiments of the present invention, owing to increased switching tube circuit Q3, Q4, when inverter was worked, the switching loss on Q1 and the Q6 can have been transferred to Q3 and Q4 branch road, had reduced the loss of power tube Q1 and Q6.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of concrete composition schematic diagram of existing five-electrical level inverter;
Fig. 2 is a concrete schematic diagram that forms of the inverter in the embodiment of the invention;
Fig. 3 is the second concrete schematic diagram that forms of the inverter in the embodiment of the invention;
Fig. 4 is the 3rd concrete schematic diagram that forms of the inverter in the embodiment of the invention;
Fig. 5 is a concrete schematic diagram that forms that comprises the inverter of two relays in the embodiment of the invention;
Fig. 6 is a concrete schematic diagram that forms that comprises the inverter of four relays in the embodiment of the invention;
Fig. 7 is second the concrete schematic diagram that forms that comprises the inverter of four relays in the embodiment of the invention;
Fig. 8 is the 3rd the concrete schematic diagram that forms that comprises the inverter of four relays in the embodiment of the invention;
Fig. 9 is a concrete schematic diagram that forms of the power supply unit in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
In embodiments of the present invention, by on the basis of five-electrical level inverter, increase the switching tube circuit, the switching loss of main power tube is transferred on the switching tube circuit of increase, can reduce the loss of main power tube.And, main power tube uses high-power insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), and the switching tube circuit that increases can use the better power tube of switching speed, such as metal-oxide half field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), when reducing the main power tube switching loss, can significantly not increase cost so yet.
Simultaneously, by diode and power relay suitably are set, when input voltage varied in size, the inverter in the embodiment of the invention can also be changed between three-level inverter and five-electrical level inverter, and the switching tube circuit that namely increases can participate in consisting of five level structures.Because the loss of five-electrical level inverter is lower than three-level inverter, when being operated in five level structures, can further reduce the switching loss of power tube.Q in following embodiment and accompanying drawing thereof represents the switching tube circuit, an end connection control signal, and in the place in circuit of two ends, it is according to control conducting or the cut-off of control signal in addition; In following circuit diagram, the unsettled end of Q represents connection control signal, does not mark in the diagram.The concrete composition of this control signal, according among the embodiment to the description of circuit function, should be appreciated that to those skilled in the art not do herein and give unnecessary details.
As shown in Figure 2, be one of the inverter in the embodiment of the invention concrete schematic diagram that forms.This inverter comprises: DC power supply, booster circuit, the hybrid five-level topological structure, described booster circuit is connected in parallel on DC power supply the two poles of the earth, described hybrid five-level topological structure is connected in parallel on two outputs of described booster circuit, the output output AC electricity of described hybrid five-level topological structure, described booster circuit comprises symmetrical two bypass diode D1 and D2, and described hybrid five-level topological structure comprises switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 and diode D3, D4, D5, D6.
D3, the Q5, Q6 and the D4 that connect successively series connection at the two poles of the earth of described DC power supply; Q1, Q5, Q6 and Q2 rear composition the first brachium pontis of connecting successively is connected in parallel on two outputs of described booster circuit, is connected in parallel on the negative pole of D1 and the positive pole of D4 after Q3, Q7, Q8, Q4 connect successively; Be connected diode D5, the plus earth of D5 at Q3 with tie point between the Q7; Be connected diode D6, the plus earth of D6 at Q4 with tie point between the Q8.
Further, above-mentioned inverter also can comprise a control unit, be used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that: when the higher and booster circuit of voltage is not worked, the input voltage of DC power supply is through Q1, D5 connects with Q7 and consists of the afterflow branch road, and Q3 connects with Q7, and described inverter circuit consists of three level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q2; When the work of the lower and booster circuit of voltage, the input voltage one tunnel of DC power supply is input to Q5, and another road is input to Q1 after boosting through booster circuit, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of five level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q6.
Wherein, Q3, Q4 can be MOSFET, and Q1, Q2, Q5, Q6, Q7, Q8 are IGBT.Because the switching speed of power MOSFET is faster, therefore can further reduce the switching loss of main power tube.Q3, Q4 also can be power MOSFET among following each embodiment, follow-uply give unnecessary details no longer one by one.All take Q3, Q4 as power MOSFET, other switching tubes are that example is illustrated for IGBT then among Fig. 2～Fig. 8.
Certainly, other forms that provide in the prior art can also be provided the concrete composition of booster circuit in embodiments of the present invention, herein only as example, and should be with this as the restriction to the specific embodiment of the invention.
As shown in Figure 3, be second of the inverter in the embodiment of the invention concrete schematic diagram that forms.Can find out that the circuit in the embodiment of the invention and the difference of the circuit shown in Fig. 1 only are, are connected in parallel on the positive pole of D3 and the negative pole of D4 after Q3, Q7, Q8, Q4 connect successively.
As shown in Figure 4, be the 3rd of the inverter in the embodiment of the invention concrete schematic diagram that forms.Can find out that the circuit in the embodiment of the invention and the difference of the circuit shown in Fig. 1 only are, are connected in parallel on the negative pole of D1 and the negative pole of D4 after Q3, Q7, Q8, Q4 connect successively.
As shown in Figure 5, on the basis of Fig. 2, this inverter also can comprise: power relay RL1, RL1 are connected in parallel on the bypass diode D1; Power relay RL2, RL2 are connected in parallel on the bypass diode D2.In this circuit, control unit also is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that when the higher booster circuit of voltage was not worked, the input voltage of DC power supply was input to Q1 through RL1, be input to RL2 through Q2; When the low booster circuit work of voltage, the input voltage one tunnel of DC power supply is input to Q5 through D3, is input to D4 through Q6, and another road is input to Q1 by RL1 after boosting through booster circuit, is input to RL2 through Q2.
As shown in Figure 6, on the basis of Fig. 5, this inverter also can comprise: power relay RL3, RL3 are connected in parallel on the diode D3 of described the first brachium pontis; Power relay RL4, RL4 are connected in parallel on the diode D4 of described the first brachium pontis.In this circuit, control unit also is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that when the higher booster circuit of voltage was not worked, the input voltage of DC power supply was input to Q1 through RL1, be input to RL2 through Q2; When the low booster circuit work of voltage, the input voltage one tunnel of DC power supply is input to Q5 through RL3, outputs to RL4 through Q6, and another road is input to Q1 by RL1 after boosting through booster circuit, is input to RL2 through Q2.
On the basis of Fig. 3, inverter in embodiments of the present invention also can comprise: power relay RL1, RL1 are connected in parallel on the bypass diode D1; Power relay RL2, RL2 are connected in parallel on the bypass diode D2.And can further comprise: power relay RL3, RL3 are connected in parallel on the diode D3 of described the first brachium pontis; Power relay RL4, RL4 are connected in parallel on the diode D4 of described the first brachium pontis.Its control circuit working condition can be with reference to the description relevant with Fig. 5 and Fig. 6.As shown in Figure 7, be four situations that relay includes.
On the basis of Fig. 4, inverter in embodiments of the present invention also can comprise: power relay RL1, RL1 are connected in parallel on the bypass diode D1; Power relay RL2, RL2 are connected in parallel on the bypass diode D2.And can further comprise: power relay RL3, RL3 are connected in parallel on the diode D3 of described the first brachium pontis; Power relay RL4, RL4 are connected in parallel on the diode D4 of described the first brachium pontis.Its control circuit working condition can be with reference to the description relevant with Fig. 5 and Fig. 6.As shown in Figure 8, be four situations that relay includes.
Namely, in the circuit of Fig. 6～8 examples, when input voltage is higher, (Boost) circuit that boosts is not worked, and the input positive voltage is input to Q1, the I font circuit of Q1 and Q5 complete through RL1, diode D5 connects with Q7 and consists of the afterflow branch road, simultaneously Q3 connect with Q7 since when the sinusoidal just half cycle of AC power output voltage the Q5 normal open, thereby on circuit form Q3 and the Q7 form in parallel with the Q1 formation.At this moment, the hybrid five-level topological structure of inverter is operated in three level configuration states.By control unit power ratio control switching tube open, turn-off sequential, make Q3 open in advance, turn-off in advance than Q1, thereby the switching loss of Q1 transferred to the Q3 branch road.In addition on the one hand, Q1, Q5 normal operation high-power IGBT, Q3 then use faster power MOQFET of switching speed, so the switching loss that sort circuit can larger reduction power tube.
When input voltage is low, booster circuit is started working, the positive voltage one tunnel of input is connected with Q5 through overpower relay RL3, another road links to each other with Q1 by RL1 after boosting through booster circuit, diode is connected with Q7 and is consisted of the afterflow branch road, Q3 connects with Q7 simultaneously, consists of form in parallel with Q1, Q5 on circuit form.At this moment, the hybrid five-level topological structure of inverter is operated in five level configuration states.By control unit power ratio control switching tube open, turn-off sequential, make Q3 open in advance, turn-off in advance than Q1, thus the switching loss of larger reduction power tube Q1.
Need to prove the situation of the input positive voltage of foregoing description; Situation during the input negative voltage is comparatively similar to above principle, does not do herein and gives unnecessary details.
By foregoing description as can be known, in embodiments of the present invention, owing to increased bypass diode D1, D2 and switching tube circuit Q3, Q4, when inverter is worked, switching loss on Q1 and the Q6 can have been transferred to Q3 and Q4 branch road, has reduced the loss of power tube Q1 and Q6.
As shown in Figure 9, be one of the power supply unit in the embodiment of the invention concrete schematic diagram that forms.This power supply unit 1 comprises the DC power supply apparatus 10 that direct current output is provided, and described direct current output is converted to the inverter 12 that exchanges output, and the load 14 that drives is exported in described interchange.According to the difference of the concrete application of power supply unit, above-mentioned DC power supply apparatus can have different selections with load, as, DC power supply apparatus is not done one by one herein and is given unnecessary details for storage battery of DC power supply etc. is provided.Above-mentioned inverter can be any one among the aforementioned inverter embodiment, the composition of inverter is not gone herein again and gives unnecessary details.
By foregoing description as can be known, the inverter circuit structure in the embodiment of the invention is in conjunction with the control of control unit, so that change between three level and five level in the hybrid five-level structure of inverter under the different voltage statuss.Because the loss of five-electrical level inverter is lower than three-level inverter, this switching can further reduce the switching loss of power tube.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or store-memory body (Random Access Memory, RAM) etc. at random.
Above disclosed is a kind of preferred embodiment of the present invention only, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (14)
1. inverter, it is characterized in that, described inverter comprises: DC power supply, booster circuit, the hybrid five-level topological structure, described booster circuit is connected in parallel on DC power supply the two poles of the earth, described hybrid five-level topological structure is connected in parallel on two outputs of described booster circuit, the output output AC electricity of described hybrid five-level topological structure, described booster circuit comprises symmetrical two bypass diode D1 and D2, and described hybrid five-level topological structure comprises switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 and diode D3, D4, D5, D6;
Wherein, connect successively with D3, Q5, Q6 and D4 in the two poles of the earth of described DC power supply;
Q1, Q5, Q6 and Q2 rear composition the first brachium pontis of connecting successively is connected in parallel on two outputs of described booster circuit, is connected in parallel on the negative pole of D1 and the positive pole of D4 after Q3, Q7, Q8, Q4 connect successively;
Be connected the negative pole of diode D5, the plus earth of D5 with the tie point between the Q7 at Q3;
Be connected the negative pole of diode D6, the plus earth of D6 with the tie point between the Q8 at Q4.
2. inverter as claimed in claim 1 is characterized in that, described inverter also comprises control unit, is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that
When the higher and booster circuit of voltage was not worked, the input voltage of DC power supply was through Q1, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of three level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q2;
When the work of the lower and booster circuit of voltage, the input voltage one tunnel of DC power supply is input to Q5, and another road is input to Q1 after boosting through booster circuit, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of five level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q6.
3. inverter as claimed in claim 1 or 2 is characterized in that, Q3, Q4 are metal-oxide half field effect transistor, and Q1, Q2, Q5, Q6, Q7, Q8 are insulated gate bipolar transistor.
4. inverter as claimed in claim 2 is characterized in that, described inverter also comprises:
Power relay RL1, RL1 are connected in parallel on the bypass diode D1;
Power relay RL2, RL2 are connected in parallel on the bypass diode D2;
Described control unit also is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that when the higher booster circuit of voltage was not worked, the input voltage of DC power supply was input to Q1 through RL1, is input to RL2 through Q2; When the low booster circuit work of voltage, the input voltage one tunnel of DC power supply is input to Q5 through D3, is input to D4 through Q6, and another road is input to Q1 by RL1 after boosting through booster circuit, is input to RL2 through Q2.
5. inverter as claimed in claim 4 is characterized in that, described inverter also comprises:
Power relay RL3, RL3 are connected in parallel on the described diode D3;
Power relay RL4, RL4 are connected in parallel on the described diode D4;
Described control unit also is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that when the higher booster circuit of voltage was not worked, the input voltage of DC power supply was input to Q1 through RL1, is input to RL2 through Q2; When the low booster circuit work of voltage, the input voltage one tunnel of DC power supply is input to Q5 through RL3, outputs to RL4 through Q6, and another road is input to Q1 by RL1 after boosting through booster circuit, is input to RL2 through Q2.
6. inverter, it is characterized in that, described inverter comprises: DC power supply, booster circuit, the hybrid five-level topological structure, described booster circuit is connected in parallel on DC power supply the two poles of the earth, described hybrid five-level topological structure is connected in parallel on two outputs of described booster circuit, the output output AC electricity of described hybrid five-level topological structure, described booster circuit comprises symmetrical two bypass diode D1 and D2, and described hybrid five-level topological structure comprises switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 and diode D3, D4, D5, D6;
Wherein, connect successively with D3, Q5, Q6 and D4 in the two poles of the earth of described DC power supply;
Q1, Q5, Q6 and Q2 rear composition the first brachium pontis of connecting successively is connected in parallel on two outputs of described booster circuit, is connected in parallel on the negative pole of the positive pole of D3 and D4 after Q3, Q7, Q8, Q4 connect successively or is connected in parallel on the negative pole of D1 and the negative pole of D4;
Be connected the negative pole of diode D5, the plus earth of D5 with the tie point between the Q7 at Q3;
Be connected the negative pole of diode D6, the plus earth of D6 with the tie point between the Q8 at Q4.
7. inverter as claimed in claim 6 is characterized in that, described inverter also comprises control unit, is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that
When the higher and booster circuit of voltage was not worked, the input voltage of DC power supply was through Q1, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of three level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q2;
When the work of the lower and booster circuit of voltage, the input voltage one tunnel of DC power supply is input to Q5, and another road is input to Q1 after boosting through booster circuit, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of five level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q6.
8. such as claim 6 or 7 described inverters, it is characterized in that Q3, Q4 are metal-oxide half field effect transistor, Q1, Q2, Q5, Q6, Q7, Q8 are insulated gate bipolar transistor.
9. inverter as claimed in claim 7 is characterized in that, described inverter also comprises:
Power relay RL1, RL1 are connected in parallel on the bypass diode D1;
Power relay RL2, RL2 are connected in parallel on the bypass diode D2;
Described control unit also is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that when the higher booster circuit of voltage was not worked, the input voltage of DC power supply was input to Q1 through RL1, is input to RL2 through Q2; When the low booster circuit work of voltage, the input voltage one tunnel of DC power supply is input to Q5 through D3, is input to D4 through Q6, and another road is input to Q1 by RL1 after boosting through booster circuit, is input to RL2 through Q2.
10. inverter as claimed in claim 9 is characterized in that, described inverter also comprises:
Power relay RL3, RL3 are connected in parallel on the described diode D3;
Power relay RL4, RL4 are connected in parallel on the described diode D4;
Described control unit also is used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that when the higher booster circuit of voltage was not worked, the input voltage of DC power supply was input to Q1 through RL1, is input to RL2 through Q2; When the low booster circuit work of voltage, the input voltage one tunnel of DC power supply is input to Q5 through RL3, outputs to RL4 through Q6, and another road is input to Q1 by RL1 after boosting through booster circuit, is input to RL2 through Q2.
11. the DC power supply apparatus that provides direct current to export is provided a power supply unit, and described direct current output is converted to the inverter that exchanges output, and the load of described interchange output driving, it is characterized in that,
Described inverter comprises: booster circuit, the hybrid five-level topological structure, described booster circuit is connected in parallel on the two poles of the earth of the direct current output of described DC power supply apparatus, described hybrid five-level topological structure is connected in parallel on two outputs of described booster circuit, the output of described hybrid five-level topological structure connects described load, described booster circuit comprises symmetrical two bypass diode D1 and D2, and described hybrid five-level topological structure comprises switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 and diode D3, D4, D5, D6;
Wherein, connect successively with D3, Q5, Q6 and D4 in the two poles of the earth of described direct current output;
Q1, Q5, Q6 and Q2 rear composition the first brachium pontis of connecting successively is connected in parallel on two outputs of described booster circuit, is connected in parallel on the negative pole of D1 and the positive pole of D4 after Q3, Q7, Q8, Q4 connect successively;
Be connected the negative pole of diode D5, the plus earth of D5 with the tie point between the Q7 at Q3;
Be connected the negative pole of diode D6, the plus earth of D6 with the tie point between the Q8 at Q4.
12. power supply unit as claimed in claim 11 is characterized in that, is not to be connected in parallel on the negative pole of D1 and the positive pole of D4 after described Q3, Q7, Q8, Q4 connect successively, but is connected in parallel on the negative pole of the positive pole of D3 and D4 or is connected in parallel on the negative pole of D1 and the negative pole of D4.
13. such as claim 11 or 12 described power supply units, it is characterized in that described inverter also comprises control unit, be used for controlling the switch of described switching tube circuit Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, so that
When the higher and booster circuit of voltage was not worked, the voltage of described direct current output was through Q1, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of three level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q2;
When the work of the lower and booster circuit of voltage, the voltage one tunnel of described direct current output is input to Q5, and another road is input to Q1 after boosting through booster circuit, the D5 formation afterflow branch road of connecting with Q7, and Q3 connects with Q7, and described inverter circuit consists of five level topological structures; And control Q3 opens in advance, turn-offs in advance than Q1, and Q4 opens in advance, turn-offs in advance than Q6.
14. power supply unit as claimed in claim 13 is characterized in that, Q3, Q4 are metal-oxide half field effect transistor, and Q1, Q2, Q5, Q6, Q7, Q8 are insulated gate bipolar transistor.
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