CN103780117A - Eleven-level single-phase inverter - Google Patents
Eleven-level single-phase inverter Download PDFInfo
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- CN103780117A CN103780117A CN201410048232.4A CN201410048232A CN103780117A CN 103780117 A CN103780117 A CN 103780117A CN 201410048232 A CN201410048232 A CN 201410048232A CN 103780117 A CN103780117 A CN 103780117A
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Abstract
The invention discloses an eleven-level single-phase inverter which comprises an alternating-current through connection port, an electric reactor, a power switch circuit and five direct-current power sources. The alternating-current through connection port is provided with an a end and a b end, the power switch circuit comprises twelve power switches, one end of the electric reactor is connected with the a end of the alternating-current through connection port, and the other end of the electric reactor and the b end of the alternating-current through connection port are respectively and electrically connected with the power switch circuit. According to the eleven-level single-phase inverter, nine different level combinations can be output; the eleven-level single-phase inverter has the advantages of being fewer in power switch, less in control switch stress, low in power loss, high in efficiency and stable in work; a filter circuit is not required to be independently arranged; alternating-current output voltage harmonic content is lower; output currents can be approximate to harmonic-wave-free ideal sine currents; the eleven-level single-phase inverter can be widely applied to instruments such as precision measurement devices, communication devices and medical devices with high requirements for power grids.
Description
Technical field
The present invention relates to a kind of inverter, refer in particular to a kind of 11 level single-phase inverters.
Background technology
Semiconductor Converting Technology can convert the electric energy of other energy conversions such as storage battery, solar cell and fuel cell thereof to AC energy also and grid network, realizes the grid-connected of energy.Therefore, Semiconductor Converting Technology is the Main Topics of power electronic technology, also becomes the key technology of new forms of energy, has and important effect at the development field of new forms of energy, has in recent years obtained numerous scholars' concern.
Conventionally the circuit of converting direct-current power into alternating-current power is called to inverter circuit, consider control system etc., be referred to as inverter.Mostly the main circuit of present many inverters is to adopt traditional H bridge circuit structure, this kind of circuit can produce three different level at AC and export and utilize these three level combinations equivalence to go out required alternating voltage, simple in structure, dependable performance, but total percent harmonic distortion is higher, characteristic harmonics in waveform is comparatively obvious, and needs larger filter reactance.In order to improve output current wave, need to adopt improved multi-electrical level inverter structure: one is multiple inverter configuration, by multiple inverter cooperatings, utilize the multiplex of main circuit to reduce the harmonic content of output voltage, a distinct disadvantage of the method be circuit structure too complexity and efficiency lower; Another kind is the novel circuit structure of research, output level by the side of increasing exchanges reduces total harmonic distortion, typically there are diode clamp type multi-electrical level inverter, capacitor pincers bit-type multi-electrical level inverter, cascade multilevel inverter etc., but for special application scenario, it is too complicated that these structures still seem, efficiency is lower, because power switch is more and bring difficulty to Control System Design.
Summary of the invention
In order to solve, existing multi-electrical level inverter topological structure is too complicated, a fairly large number of problem of power switch, the present invention proposes a kind of 11 level single-phase inverters, can export nine different level combinations, have advantages of that power switch is few, control strategy is simple, stable.
The technical solution adopted in the present invention is: a kind of 11 level single-phase inverters, comprise interchange transit ports, reactor, power switch circuit and five DC power supply, five DC power supply are respectively DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4 and DC power supply V5, described interchange transit ports is provided with a end and b end, and described power switch circuit comprises power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8, power switch Q9, power switch Q10, power switch Q11 and power switch Q12, one end of described reactor connects a end that exchanges transit ports, the emitter of the other end of reactor and power switch Q1, the collector electrode electrical connection of power switch Q4, exchanges the b end of transit ports and the emitter of power switch Q2, the collector electrode electrical connection of power switch Q3, the collector electrode of power switch Q1, the collector electrode of power switch Q2, the collector electrode of power switch Q5, the emitter electrical connection of power switch Q6, the collector electrode of power switch Q6, the collector electrode of power switch Q7, the emitter electrical connection of power switch Q8, the emitter of power switch Q3, the emitter of power switch Q4, the emitter of power switch Q9, the collector electrode electrical connection of power switch Q10, the positive pole of DC power supply V1 is electrically connected with the collector electrode of power switch Q8, the emitter of power switch Q10, the emitter of power switch Q11, the collector electrode electrical connection of power switch Q12, the positive pole of DC power supply V1 is electrically connected with the collector electrode of power switch Q8, the negative pole of DC power supply V1, the positive pole of DC power supply V2 is electrically connected with the emitter of power switch Q7 respectively, the negative pole of DC power supply V2, the positive pole of DC power supply V3 is electrically connected with the emitter of power switch Q5 respectively, the negative pole of DC power supply V3, the positive pole of DC power supply V4 is electrically connected with the collector electrode of power switch Q9 respectively, the negative pole of DC power supply V4, the positive pole of DC power supply V5 is electrically connected with the collector electrode of power switch Q11 respectively, and the negative pole of DC power supply V5 is electrically connected with the emitter of power switch Q12.
The present invention can export nine different level combinations, has advantages of that power switch is few, it is simple to control, stable.
As preferably, described reactor is smoothing reactor.
As preferably, described power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8, power switch Q9, power switch Q10, power switch Q11 and power switch Q12 are IGBT.
Preferred as another, described power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8, power switch Q9, power switch Q10, power switch Q11 and power switch Q12 are MOSFET.MOSFET element is applicable to small-power occasion.
As preferably, the magnitude of voltage of described DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 is identical.The circuit of design has symmetry like this.
As preferably, the two ends of described DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 are connected with DC capacitor respectively.DC capacitor is used for supporting direct voltage.
As preferably, described reactor is connected with diode and filter capacitor with exchanging between port, the anodal linked reactor of described diode, the negative pole of diode connects a end that exchanges transit ports, and the two ends of described filter capacitor connect respectively the positive pole and the b end that exchanges transit ports of diode.Diode is used for preventing pouring in down a chimney of AC network energy, and while preventing that busbar voltage is lower, power network current flows to inverter side; Filter capacitor is for the filtering of inverter circuit, elimination high-frequency current component.
The invention has the beneficial effects as follows: there is power switch negligible amounts, control switch stress is less, power loss is little, efficiency is higher, work more stable, without filter circuit is set separately, ac output voltage harmonic content is little, output current can be similar to the ideal sinusoidal electric current of thinking without harmonic wave, the instruments such as the accurate measurement that can be widely used in electrical network to have relatively high expectations, communication and Medical Devices.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram of the present invention;
Fig. 2 is another kind of circuit diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1
As shown in Figure 1, a kind of 11 level single-phase inverters, comprise and exchange transit ports J1, reactor L1, power switch circuit and DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5, exchanges transit ports J1 and is provided with a end and b end, and power switch circuit comprises power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8, power switch Q9 power switch Q10, power switch Q11 and power switch Q12 be totally 12 power switchs, and one end of reactor L1 connects a end that exchanges transit ports J1, the emitter of the other end of reactor L1 and power switch Q1, the collector electrode electrical connection of power switch Q4, exchanges the b end of transit ports J1 and the emitter of power switch Q2, the collector electrode electrical connection of power switch Q3, the collector electrode of power switch Q1, the collector electrode of power switch Q2, the collector electrode of power switch Q5, the emitter electrical connection of power switch Q6, the collector electrode of power switch Q6, the collector electrode of power switch Q7, the emitter electrical connection of power switch Q8, the emitter of power switch Q3, the emitter of power switch Q4, the emitter of power switch Q9, the collector electrode electrical connection of power switch Q10, the emitter of power switch Q10, the emitter of power switch Q11, the collector electrode electrical connection of power switch Q12, the positive pole of DC power supply V1 is electrically connected with the collector electrode of power switch Q8, the negative pole of DC power supply V1, the positive pole of DC power supply V2 is electrically connected with the emitter of power switch Q7 respectively, the negative pole of DC power supply V2, the positive pole of DC power supply V3 is electrically connected with the emitter of power switch Q5 respectively, the negative pole of DC power supply V3, the positive pole of DC power supply V4 is electrically connected with the collector electrode of power switch Q9 respectively, the negative pole of DC power supply V4, the positive pole of DC power supply V5 is electrically connected with the collector electrode of power switch Q11 respectively, and the negative pole of DC power supply V5 is electrically connected with the emitter of power switch Q12.
Exchange transit ports J1 and be used for connecting load, can be for inductive load can be also the loads higher to power requirement such as resistive load in practical application, the present invention can produce the required voltage waveform of user in this load-side.
Reactor L1 is smoothing reactor, and for flat ripple effect, choosing of smoothing reactor can be chosen according to direct voltage and AC voltage, and its value can be selected the 5%-10% of the frequency inverter capacity of capacity.DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 are the DC power supply that magnitude of voltage is vdc, be responsible for balance direct voltage, and AC energy is provided.The two ends of DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 all can connect respectively DC capacitor.
Power switch circuit is made up of 12 power switchs, by adopting suitable PWM to control, can produce required voltage waveform at AC.Power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8, power switch Q9, power switch Q10, power switch Q11 and power switch Q12 all adopt IGBT, the power that the choosing of IGBT mainly need to be changed according to circuit and the electric current of inverter are chosen, and will consider certain surplus.Power switch Q1, power switch Q2, power switch Q3, power switch Q4 are responsible for the commutation of control inverter output, utilize PWM principle can simulate any waveform.Power switch Q5 and power switch Q6, power switch Q7 and power switch Q8, power switch Q9 and power switch Q10, power switch Q11 and power switch Q12 form respectively complementary power switch, be responsible for the variation of the amplitude of control inverter output end voltage, can increase the true to nature degree of output waveform to reference waveform, reduce the harmonic wave in inverter output current, reduce power switch loss, improve the service behaviour of inverter.The present invention can produce 11 different level outputs at AC incoming end by controlling the combination of different power switch: 0, vdc ,-vdc, 2vdc ,-2vdc, 3vdc ,-3vdc, 4vdc ,-4vdc, 5vdc and-5vdc.
The present invention utilizes different power switch combinations and forms 20 kinds of mode of operations, and can have 11 kinds of different direct voltage outputs in these 20 kinds of mode of operations:
Power switch Q1, power switch Q6, power switch Q8, power switch Q12, power switch Q10 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 output current simultaneously, ac output voltage is now 5vdc; Power switch Q1, power switch Q6, power switch Q8, power switch Q11, power switch Q10 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4 output current simultaneously, DC power supply V5 is in vacant state, and ac output voltage is now 4vdc; Power switch Q1, power switch Q6, power switch Q8, power switch Q9 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3 output current simultaneously, DC power supply V4, DC power supply V5 are in vacant state, and ac output voltage is now 3vdc; Power switch Q1, power switch Q6, power switch Q7, power switch Q12, power switch Q10 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 output current simultaneously, DC power supply V1 is in vacant state, and ac output voltage is now 4vdc; Power switch Q1, power switch Q6, power switch Q7, power switch Q11, power switch Q10 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V2, DC power supply V3, DC power supply V4 output current simultaneously, DC power supply V1, DC power supply V5 are in vacant state, and ac output voltage is now 3vdc; Power switch Q1, power switch Q6, power switch Q7, power switch Q9 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V2, DC power supply V3 be output current simultaneously, DC power supply V1, DC power supply V4, DC power supply V5 are in vacant state, and ac output voltage is now 2vdc; Power switch Q1, power switch Q5, power switch Q12, power switch Q10 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V3, DC power supply V4, DC power supply V5 output current, DC power supply V1, DC power supply V2 are in vacant state, and ac output voltage is now 3vdc; Power switch Q1, power switch Q5, power switch Q11, power switch Q10 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V3, DC power supply V4 output current, DC power supply V1, DC power supply V2, DC power supply V5 are in vacant state, and ac output voltage is now 2vdc; Power switch Q1, power switch Q5, power switch Q9 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V3 output current, DC power supply V1, DC power supply V2, DC power supply V4, DC power supply V5 are in vacant state, and ac output voltage is now vdc; Power switch Q1, power switch Q2 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 are all in vacant state, and ac output voltage is now 0;
Power switch Q4, power switch Q10, power switch Q12, power switch Q8, power switch Q6 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 output current simultaneously, for oppositely, ac output voltage is now-5vdc; Power switch Q4, power switch Q10, power switch Q12, power switch Q7, power switch Q6 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 output current simultaneously, for oppositely, DC power supply V1 is in vacant state, and ac output voltage is now-4vdc; Power switch Q4, power switch Q10, power switch Q12, power switch Q5 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V3, DC power supply V4, DC power supply V5 output current simultaneously, for oppositely, DC power supply V1, DC power supply V2 are in vacant state, and ac output voltage is now-3vdc; Power switch Q4, power switch Q10, power switch Q11, power switch Q8, power switch Q6 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4 output current simultaneously, for oppositely, DC power supply V5 is in vacant state, and ac output voltage is now-4vdc; Power switch Q4, power switch Q10, power switch Q11, power switch Q7, power switch Q6 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V2, DC power supply V3, DC power supply V4 output current simultaneously, for oppositely, DC power supply V1, DC power supply V5 are in vacant state, and ac output voltage is now-3vdc; Power switch Q4, power switch Q10, power switch Q11, power switch Q5 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V3, DC power supply V4 be output current simultaneously, for oppositely, DC power supply V1, DC power supply V2, DC power supply V5 are in vacant state, and ac output voltage is now-2vdc; Power switch Q4, power switch Q9, power switch Q8, power switch Q6 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3 output current, for oppositely, DC power supply V4, DC power supply V5 are in vacant state, and ac output voltage is now-3vdc; Power switch Q4, power switch Q9, power switch Q7, power switch Q6 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V2, DC power supply V3 output current, for oppositely, DC power supply V1, DC power supply V4, DC power supply V5 are in vacant state, and ac output voltage is now-2vdc; Power switch Q4, power switch Q9, power switch Q5 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V3 output current, for oppositely, DC power supply V1, DC power supply V2, DC power supply V4, DC power supply V5 are in vacant state, and ac output voltage is now-vdc; Power switch Q4, power switch Q3 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 are all in vacant state, and ac output voltage is now 0.
Embodiment 2
In embodiment 2, as shown in Figure 2, reactor L1 is connected with diode D1 and filter capacitor C1 with exchanging between port J1, the anodal linked reactor L1 of diode D1, the negative pole of diode D1 connects a end that exchanges transit ports, the two ends of filter capacitor C1 connect respectively the positive pole and the b end that exchanges transit ports J1 of diode D1, diode D1 is used for preventing pouring in down a chimney of AC network energy, while preventing that busbar voltage is lower, power network current flows to inverter side, filter capacitor C1 is for the filtering of inverter circuit, elimination high-frequency current component.Power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8, power switch Q9, power switch Q10, power switch Q11 and power switch Q12 are MOSFET.Identical in other and embodiment 1.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection scope of the present invention.
Claims (7)
1. 11 level single-phase inverters, is characterized in that: comprise interchange transit ports, reactor, power switch circuit and five DC power supply, five DC power supply are respectively DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4 and DC power supply V5, described interchange transit ports is provided with a end and b end, and described power switch circuit comprises power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8, power switch Q9, power switch Q10, power switch Q11 and power switch Q12, one end of described reactor connects a end that exchanges transit ports, the emitter of the other end of reactor and power switch Q1, the collector electrode electrical connection of power switch Q4, exchanges the b end of transit ports and the emitter of power switch Q2, the collector electrode electrical connection of power switch Q3, the collector electrode of power switch Q1, the collector electrode of power switch Q2, the collector electrode of power switch Q5, the emitter electrical connection of power switch Q6, the collector electrode of power switch Q6, the collector electrode of power switch Q7, the emitter electrical connection of power switch Q8, the emitter of power switch Q3, the emitter of power switch Q4, the emitter of power switch Q9, the collector electrode electrical connection of power switch Q10, the positive pole of DC power supply V1 is electrically connected with the collector electrode of power switch Q8, the emitter of power switch Q10, the emitter of power switch Q11, the collector electrode electrical connection of power switch Q12, the positive pole of DC power supply V1 is electrically connected with the collector electrode of power switch Q8, the negative pole of DC power supply V1, the positive pole of DC power supply V2 is electrically connected with the emitter of power switch Q7 respectively, the negative pole of DC power supply V2, the positive pole of DC power supply V3 is electrically connected with the emitter of power switch Q5 respectively, the negative pole of DC power supply V3, the positive pole of DC power supply V4 is electrically connected with the collector electrode of power switch Q9 respectively, the negative pole of DC power supply V4, the positive pole of DC power supply V5 is electrically connected with the collector electrode of power switch Q11 respectively, and the negative pole of DC power supply V5 is electrically connected with the emitter of power switch Q12.
2. 11 level single-phase inverters according to claim 1, is characterized in that: described reactor is smoothing reactor.
3. 11 level single-phase inverters according to claim 1, is characterized in that: described power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8, power switch Q9, power switch Q10, power switch Q11 and power switch Q12 are IGBT.
4. 11 level single-phase inverters according to claim 1, is characterized in that: described power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8, power switch Q9, power switch Q10, power switch Q11 and power switch Q12 are MOSFET.
5. 11 level single-phase inverters according to claim 1, is characterized in that: the magnitude of voltage of described DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 is identical.
6. 11 level single-phase inverters according to claim 1 or 5, is characterized in that: the two ends of described DC power supply V1, DC power supply V2, DC power supply V3, DC power supply V4, DC power supply V5 are connected with DC capacitor respectively.
7. 11 level single-phase inverters according to claim 1, it is characterized in that: described reactor is connected with diode and filter capacitor with exchanging between port, the anodal linked reactor of described diode, the negative pole of diode connects a end that exchanges transit ports, and the two ends of described filter capacitor connect respectively the positive pole and the b end that exchanges transit ports of diode.
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Citations (5)
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| JP2006087257A (en) * | 2004-09-17 | 2006-03-30 | Fuji Electric Holdings Co Ltd | Multilevel converter and its control method |
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| JP2013078204A (en) * | 2011-09-30 | 2013-04-25 | Toshiba Corp | Power converting device |
| JP5397203B2 (en) * | 2009-12-15 | 2014-01-22 | 富士電機株式会社 | Power converter |
| CN203734562U (en) * | 2014-02-12 | 2014-07-23 | 宁波绿凯节能科技有限公司 | Eleven-level single-phase inverter |
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2014
- 2014-02-12 CN CN201410048232.4A patent/CN103780117A/en active Pending
Patent Citations (5)
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| JP2006087257A (en) * | 2004-09-17 | 2006-03-30 | Fuji Electric Holdings Co Ltd | Multilevel converter and its control method |
| JP5397203B2 (en) * | 2009-12-15 | 2014-01-22 | 富士電機株式会社 | Power converter |
| JP2013078204A (en) * | 2011-09-30 | 2013-04-25 | Toshiba Corp | Power converting device |
| CN102638191A (en) * | 2012-04-13 | 2012-08-15 | 阳光电源股份有限公司 | Seven-level inversion topology unit and seven-level inverter |
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Application publication date: 20140507 |